2019-05-27 08:55:05 +02:00
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2005-04-16 15:20:36 -07:00
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2007-10-15 09:50:19 +02:00
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2005-04-16 15:20:36 -07:00
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2017-02-02 19:15:33 +01:00
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2005-04-16 15:20:36 -07:00
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2009-06-05 17:40:04 +02:00
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2011-09-22 09:34:58 -04:00
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2005-04-16 15:20:36 -07:00
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2012-07-27 18:27:00 +02:00
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2005-04-16 15:20:36 -07:00
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2017-05-26 09:30:46 +09:00
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ALSA: pcm: Replace PCM hwptr tracking with tracepoints
ALSA PCM core has a mechanism tracking the PCM hwptr updates for
analyzing XRUNs. But its log is limited (up to 10) and its log output
is a kernel message, which is hard to handle.
In this patch, the hwptr logging is moved to the tracing
infrastructure instead of its own. Not only the hwptr updates but
also XRUN and hwptr errors are recorded on the trace log, so that user
can see such events at the exact timing.
The new "snd_pcm" entry will appear in the tracing events:
# ls -F /sys/kernel/debug/tracing/events/snd_pcm
enable filter hw_ptr_error/ hwptr/ xrun/
The hwptr is for the regular hwptr update events. An event trace
looks like:
aplay-26187 [004] d..3 4012.834761: hwptr: pcmC0D0p/sub0: POS: pos=488, old=0, base=0, period=1024, buf=16384
"POS" shows the hwptr update by the explicit position update call and
"IRQ" means the hwptr update by the interrupt,
i.e. snd_pcm_period_elapsed() call. The "pos" is the passed
ring-buffer offset by the caller, "old" is the previous hwptr, "base"
is the hwptr base position, "period" and "buf" are period- and
buffer-size of the target PCM substream.
(Note that the hwptr position displayed here isn't the ring-buffer
offset. It increments up to the PCM position boundary.)
The XRUN event appears similarly, but without "pos" field.
The hwptr error events appear with the PCM identifier and its reason
string, such as "Lost interrupt?".
The XRUN and hwptr error reports on kernel message are still left, can
be turned on/off via xrun_debug proc like before. But the bit 3, 4, 5
and 6 bits of xrun_debug proc are dropped by this patch. Also, along
with the change, the message strings have been reformatted to be a bit
more consistent.
Last but not least, the hwptr reporting is enabled only when
CONFIG_SND_PCM_XRUN_DEBUG is set.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-11-04 12:45:59 +01:00
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ALSA: pcm: add 'applptr' event of tracepoint
In design of ALSA PCM core, status and control data for runtime of ALSA
PCM substream are shared between kernel/user spaces by page frame
mapping with read-only attribute. Both of hardware-side and
application-side position on PCM buffer are maintained as a part of
the status data. In a view of ALSA PCM application, these two positions
can be updated by executing ioctl(2) with some commands.
There's an event of tracepoint for hardware-side position; 'hwptr'.
On the other hand, no events for application-side position. This commit
adds a new event for this purpose; 'applptr'. When the application-side
position is changed in kernel space, this event is probed with useful
information for developers.
I note that the event is not probed for all of ALSA PCM applications, When
applications are written by read/write programming scenario, the event is
surely probed. The applications execute ioctl(2) with
SNDRV_PCM_IOCTL_[READ|WRITE][N/I]_FRAMES to read/write any PCM frame, then
ALSA PCM core updates the application-side position in kernel land.
However, when applications are written by mmap programming scenario, if
maintaining the application side position in kernel space accurately,
applications should voluntarily execute ioctl(2) with
SNDRV_PCM_IOCTL_SYNC_PTR to commit the number of handled PCM frames. If
not voluntarily, the application-side position is not changed, thus the
added event is not probed.
There's a loophole, using architectures to which ALSA PCM core judges
non cache coherent. In this case, the status and control data is not mapped
into processe's VMA for any applications. Userland library, alsa-lib, is
programmed for this case. It executes ioctl(2) with
SNDRV_PCM_IOCTL_SYNC_PTR command every time to requiring the status and
control data.
ARM is such an architecture. Below is an example with serial sound interface
(ssi) on i.mx6 quad core SoC. I use v4.1 kernel released by fsl-community
with patches from VIA Tech. Inc. for VAB820, and my backport patches for
relevant features for this patchset. I use Ubuntu 17.04 from
ports.ubuntu.com as user land for armhf architecture.
$ aplay -v -M -D hw:imx6vab820sgtl5,0 /dev/urandom -f S16_LE -r 48000 --period-size=128 --buffer-size=256
Playing raw data '/dev/urandom' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
Hardware PCM card 0 'imx6-vab820-sgtl5000' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 48000
exact rate : 48000 (48000/1)
msbits : 16
buffer_size : 256
period_size : 128
period_time : 2666
tstamp_mode : NONE
tstamp_type : MONOTONIC
period_step : 1
avail_min : 128
period_event : 0
start_threshold : 256
stop_threshold : 256
silence_threshold: 0
silence_size : 0
boundary : 1073741824
appl_ptr : 0
hw_ptr : 0
mmap_area[0] = 0x76f98000,0,16 (16)
$ trace-cmd record -e snd_pcm:hwptr -e snd_pcm:applptr
$ trace-cmd report
...
60.208495: applptr: pcmC0D0p/sub0: prev=1792, curr=1792, avail=0, period=128, buf=256
60.208633: applptr: pcmC0D0p/sub0: prev=1792, curr=1792, avail=0, period=128, buf=256
60.210022: hwptr: pcmC0D0p/sub0: IRQ: pos=128, old=1536, base=1536, period=128, buf=256
60.210202: applptr: pcmC0D0p/sub0: prev=1792, curr=1792, avail=128, period=128, buf=256
60.210344: hwptr: pcmC0D0p/sub0: POS: pos=128, old=1664, base=1536, period=128, buf=256
60.210348: applptr: pcmC0D0p/sub0: prev=1792, curr=1792, avail=128, period=128, buf=256
60.210486: applptr: pcmC0D0p/sub0: prev=1792, curr=1792, avail=128, period=128, buf=256
60.210626: applptr: pcmC0D0p/sub0: prev=1792, curr=1920, avail=0, period=128, buf=256
60.211002: applptr: pcmC0D0p/sub0: prev=1920, curr=1920, avail=0, period=128, buf=256
60.211142: hwptr: pcmC0D0p/sub0: POS: pos=128, old=1664, base=1536, period=128, buf=256
60.211146: applptr: pcmC0D0p/sub0: prev=1920, curr=1920, avail=0, period=128, buf=256
60.211287: applptr: pcmC0D0p/sub0: prev=1920, curr=1920, avail=0, period=128, buf=256
60.212690: hwptr: pcmC0D0p/sub0: IRQ: pos=0, old=1664, base=1536, period=128, buf=256
60.212866: applptr: pcmC0D0p/sub0: prev=1920, curr=1920, avail=128, period=128, buf=256
60.212999: hwptr: pcmC0D0p/sub0: POS: pos=0, old=1792, base=1792, period=128, buf=256
60.213003: applptr: pcmC0D0p/sub0: prev=1920, curr=1920, avail=128, period=128, buf=256
60.213135: applptr: pcmC0D0p/sub0: prev=1920, curr=1920, avail=128, period=128, buf=256
60.213276: applptr: pcmC0D0p/sub0: prev=1920, curr=2048, avail=0, period=128, buf=256
60.213654: applptr: pcmC0D0p/sub0: prev=2048, curr=2048, avail=0, period=128, buf=256
60.213796: hwptr: pcmC0D0p/sub0: POS: pos=0, old=1792, base=1792, period=128, buf=256
60.213800: applptr: pcmC0D0p/sub0: prev=2048, curr=2048, avail=0, period=128, buf=256
60.213937: applptr: pcmC0D0p/sub0: prev=2048, curr=2048, avail=0, period=128, buf=256
60.215356: hwptr: pcmC0D0p/sub0: IRQ: pos=128, old=1792, base=1792, period=128, buf=256
60.215542: applptr: pcmC0D0p/sub0: prev=2048, curr=2048, avail=128, period=128, buf=256
60.215679: hwptr: pcmC0D0p/sub0: POS: pos=128, old=1920, base=1792, period=128, buf=256
60.215683: applptr: pcmC0D0p/sub0: prev=2048, curr=2048, avail=128, period=128, buf=256
60.215813: applptr: pcmC0D0p/sub0: prev=2048, curr=2048, avail=128, period=128, buf=256
60.215947: applptr: pcmC0D0p/sub0: prev=2048, curr=2176, avail=0, period=128, buf=256
...
We can surely see 'applptr' event is probed even if the application run
for mmap programming scenario ('-M' option and 'hw' plugin). Below is a
result of strace:
02:44:15.886382 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.887203 poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL}], 1, -1) = 1 ([{fd=4, revents=POLLOUT}])
02:44:15.887471 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.887637 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.887805 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.887969 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.888132 read(3, "..."..., 256) = 256
02:44:15.889040 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.889221 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.889431 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.889606 poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL}], 1, -1) = 1 ([{fd=4, revents=POLLOUT}])
02:44:15.889833 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.889998 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.890164 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.891048 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.891228 read(3, "..."..., 256) = 256
02:44:15.891497 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.891661 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.891829 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.891991 poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL}], 1, -1) = 1 ([{fd=4, revents=POLLOUT}])
02:44:15.893007 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
We can see 7 calls of ioctl(2) with SNDRV_PCM_IOCTL_SYNC_PTR per loop with
call of poll(2). 128 PCM frames are transferred per loop of one poll(2),
because the PCM substream is configured with S16_LE format and 1 channel
(2 byte * 1 * 128 = 256 bytes). This equals to the size of period of PCM
buffer. Comparing to the probed data, one of the 7 calls of ioctl(2) is
actually used to commit the number of copied PCM frames to kernel space.
The other calls are just used to check runtime status of PCM substream;
e.g. XRUN.
The tracepoint event is useful to investigate this case. I note that below
modules are related to the above sample.
* snd-soc-dummy.ko
* snd-soc-imx-sgtl5000.ko
* snd-soc-fsl-ssi.ko
* snd-soc-imx-pcm-dma.ko
* snd-soc-sgtl5000.ko
My additional note is lock acquisition. The event is probed under acquiring
PCM stream lock. This means that calculation in the event is free from
any hardware events.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-06-12 09:41:45 +09:00
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ALSA: pcm: Replace PCM hwptr tracking with tracepoints
ALSA PCM core has a mechanism tracking the PCM hwptr updates for
analyzing XRUNs. But its log is limited (up to 10) and its log output
is a kernel message, which is hard to handle.
In this patch, the hwptr logging is moved to the tracing
infrastructure instead of its own. Not only the hwptr updates but
also XRUN and hwptr errors are recorded on the trace log, so that user
can see such events at the exact timing.
The new "snd_pcm" entry will appear in the tracing events:
# ls -F /sys/kernel/debug/tracing/events/snd_pcm
enable filter hw_ptr_error/ hwptr/ xrun/
The hwptr is for the regular hwptr update events. An event trace
looks like:
aplay-26187 [004] d..3 4012.834761: hwptr: pcmC0D0p/sub0: POS: pos=488, old=0, base=0, period=1024, buf=16384
"POS" shows the hwptr update by the explicit position update call and
"IRQ" means the hwptr update by the interrupt,
i.e. snd_pcm_period_elapsed() call. The "pos" is the passed
ring-buffer offset by the caller, "old" is the previous hwptr, "base"
is the hwptr base position, "period" and "buf" are period- and
buffer-size of the target PCM substream.
(Note that the hwptr position displayed here isn't the ring-buffer
offset. It increments up to the PCM position boundary.)
The XRUN event appears similarly, but without "pos" field.
The hwptr error events appear with the PCM identifier and its reason
string, such as "Lost interrupt?".
The XRUN and hwptr error reports on kernel message are still left, can
be turned on/off via xrun_debug proc like before. But the bit 3, 4, 5
and 6 bits of xrun_debug proc are dropped by this patch. Also, along
with the change, the message strings have been reformatted to be a bit
more consistent.
Last but not least, the hwptr reporting is enabled only when
CONFIG_SND_PCM_XRUN_DEBUG is set.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-11-04 12:45:59 +01:00
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2017-05-24 18:18:15 +02:00
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2023-05-05 17:52:42 +02:00
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2005-04-16 15:20:36 -07:00
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2023-05-05 17:52:38 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2023-05-05 17:52:38 +02:00
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ALSA: pcm: Introduce copy_user, copy_kernel and fill_silence ops
For supporting the explicit in-kernel copy of PCM buffer data, and
also for further code refactoring, three new PCM ops, copy_user,
copy_kernel and fill_silence, are introduced. The old copy and
silence ops will be deprecated and removed later once when all callers
are converted.
The copy_kernel ops is the new one, and it's supposed to transfer the
PCM data from the given kernel buffer to the hardware ring-buffer (or
vice-versa depending on the stream direction), while the copy_user ops
is equivalent with the former copy ops, to transfer the data from the
user-space buffer.
The major difference of the new copy_* and fill_silence ops from the
previous ops is that the new ops take bytes instead of frames for size
and position arguments. It has two merits: first, it allows the
callback implementation often simpler (just call directly memcpy() &
co), and second, it may unify the implementations of both interleaved
and non-interleaved cases, as we'll see in the later patch.
As of this stage, copy_kernel ops isn't referred yet, but only
copy_user is used.
Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-05-10 20:02:35 +02:00
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2005-04-16 15:20:36 -07:00
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2023-05-05 17:52:42 +02:00
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2023-05-05 17:52:38 +02:00
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2023-05-05 17:52:42 +02:00
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2023-05-05 17:52:39 +02:00
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2023-05-05 17:52:38 +02:00
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2005-04-16 15:20:36 -07:00
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2023-05-05 17:52:38 +02:00
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2023-05-05 17:52:43 +02:00
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2023-05-05 17:52:38 +02:00
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2023-05-05 17:52:43 +02:00
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2023-05-05 17:52:38 +02:00
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2023-05-05 17:52:43 +02:00
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2023-05-05 17:52:38 +02:00
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2005-04-16 15:20:36 -07:00
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2008-08-08 17:09:09 +02:00
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2023-05-05 17:52:38 +02:00
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2023-05-05 17:52:40 +02:00
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2023-05-05 17:52:44 +02:00
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2005-04-16 15:20:36 -07:00
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2017-05-24 18:18:15 +02:00
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2005-04-16 15:20:36 -07:00
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2023-05-05 17:52:44 +02:00
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ALSA: memalloc: Support for non-contiguous page allocation
This patch adds the support for allocation of non-contiguous DMA pages
in the common memalloc helper. It's another SG-buffer type, but
unlike the existing one, this is directional and requires the explicit
sync / invalidation of dirty pages on non-coherent architectures.
For this enhancement, the following points are changed:
- snd_dma_device stores the DMA direction.
- snd_dma_device stores need_sync flag indicating whether the explicit
sync is required or not.
- A new variant of helper functions, snd_dma_alloc_dir_pages() and
*_all() are introduced; the old snd_dma_alloc_pages() and *_all()
kept as just wrappers with DMA_BIDIRECTIONAL.
- A new helper snd_dma_buffer_sync() is introduced; this gets called
in the appropriate places.
- A new allocation type, SNDRV_DMA_TYPE_NONCONTIG, is introduced.
When the driver allocates pages with this new type, and it may require
the SNDRV_PCM_INFO_EXPLICIT_SYNC flag set to the PCM hardware.info for
taking the full control of PCM applptr and hwptr changes (that implies
disabling the mmap of control/status data). When the buffer
allocation is managed by snd_pcm_set_managed_buffer(), this flag is
automatically set depending on the result of dma_need_sync()
internally. Otherwise, if the buffer is managed manually, the driver
has to set the flag explicitly, too.
The explicit sync between CPU and device for non-coherent memory is
performed at the points before and after read/write transfer as well
as the applptr/hwptr syncptr ioctl. In the case of mmap mode,
user-space is supposed to call the syncptr ioctl with the hwptr flag
to update and fetch the status at first; this corresponds to CPU-sync.
Then user-space advances the applptr via syncptr ioctl again with
applptr flag, and this corresponds to the device sync with flushing.
Other than the DMA direction and the explicit sync, the usage of this
new buffer type is almost equivalent with the existing
SNDRV_DMA_TYPE_DEV_SG; you can get the page and the address via
snd_sgbuf_get_page() and snd_sgbuf_get_addr(), also calculate the
continuous pages via snd_sgbuf_get_chunk_size().
For those SG-page handling, the non-contig type shares the same ops
with the vmalloc handler. As we do always vmap the SG pages at first,
the actual address can be deduced from the vmapped address easily
without iterating the SG-list.
Link: https://lore.kernel.org/r/20211017074859.24112-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-10-17 09:48:57 +02:00
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2005-04-16 15:20:36 -07:00
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2011-07-23 12:36:25 +12:00
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2009-06-08 15:58:48 +02:00
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2011-07-23 12:36:25 +12:00
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2009-06-08 15:58:48 +02:00
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2009-12-20 11:47:57 +01:00
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2010-03-26 16:07:25 +02:00
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2009-12-20 11:47:57 +01:00
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2018-07-04 14:46:27 +02:00
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2005-04-16 15:20:36 -07:00
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2009-05-28 11:31:20 +02:00
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ALSA: pcm: Replace PCM hwptr tracking with tracepoints
ALSA PCM core has a mechanism tracking the PCM hwptr updates for
analyzing XRUNs. But its log is limited (up to 10) and its log output
is a kernel message, which is hard to handle.
In this patch, the hwptr logging is moved to the tracing
infrastructure instead of its own. Not only the hwptr updates but
also XRUN and hwptr errors are recorded on the trace log, so that user
can see such events at the exact timing.
The new "snd_pcm" entry will appear in the tracing events:
# ls -F /sys/kernel/debug/tracing/events/snd_pcm
enable filter hw_ptr_error/ hwptr/ xrun/
The hwptr is for the regular hwptr update events. An event trace
looks like:
aplay-26187 [004] d..3 4012.834761: hwptr: pcmC0D0p/sub0: POS: pos=488, old=0, base=0, period=1024, buf=16384
"POS" shows the hwptr update by the explicit position update call and
"IRQ" means the hwptr update by the interrupt,
i.e. snd_pcm_period_elapsed() call. The "pos" is the passed
ring-buffer offset by the caller, "old" is the previous hwptr, "base"
is the hwptr base position, "period" and "buf" are period- and
buffer-size of the target PCM substream.
(Note that the hwptr position displayed here isn't the ring-buffer
offset. It increments up to the PCM position boundary.)
The XRUN event appears similarly, but without "pos" field.
The hwptr error events appear with the PCM identifier and its reason
string, such as "Lost interrupt?".
The XRUN and hwptr error reports on kernel message are still left, can
be turned on/off via xrun_debug proc like before. But the bit 3, 4, 5
and 6 bits of xrun_debug proc are dropped by this patch. Also, along
with the change, the message strings have been reformatted to be a bit
more consistent.
Last but not least, the hwptr reporting is enabled only when
CONFIG_SND_PCM_XRUN_DEBUG is set.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-11-04 12:45:59 +01:00
|
|
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|
2018-04-24 20:06:08 +08:00
|
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ALSA: add new 32-bit layout for snd_pcm_mmap_status/control
The snd_pcm_mmap_status and snd_pcm_mmap_control interfaces are one of the
trickiest areas to get right when moving to 64-bit time_t in user space.
The snd_pcm_mmap_status structure layout is incompatible with user space
that uses a 64-bit time_t, so we need a new layout for it. Since the
SNDRV_PCM_IOCTL_SYNC_PTR ioctl combines it with snd_pcm_mmap_control
into snd_pcm_sync_ptr, we need to change those two as well.
Both structures are also exported via an mmap() operation on certain
architectures, and this suffers from incompatibility between 32-bit
and 64-bit user space. As we have to change both structures anyway,
this is a good opportunity to fix the mmap() problem as well, so let's
standardize on the existing 64-bit layout of the structure where possible.
The downside is that we lose mmap() support for existing 32-bit x86 and
powerpc applications, adding that would introduce very noticeable runtime
overhead and complexity. My assumption here is that not too many people
will miss the removed feature, given that:
- Almost all x86 and powerpc users these days are on 64-bit kernels,
the majority of today's 32-bit users are on architectures that never
supported mmap (ARM, MIPS, ...).
- It never worked in compat mode (it was intentionally disabled there)
- The application already needs to work with a fallback to
SNDRV_PCM_IOCTL_SYNC_PTR, which will keep working with both the old
and new structure layout.
Both the ioctl() and mmap() based interfaces are changed at the same
time, as they are based on the same structures. Unlike other interfaces,
we change the uapi header to export both the traditional structure and
a version that is portable between 32-bit and 64-bit user space code
and that corresponds to the existing 64-bit layout. We further check the
__USE_TIME_BITS64 macro that will be defined by future C library versions
whenever we use the new time_t definition, so any existing user space
source code will not see any changes until it gets rebuilt against a new
C library. However, the new structures are all visible in addition to the
old ones, allowing applications to explicitly request the new structures.
In order to detect the difference between the old snd_pcm_mmap_status and
the new __snd_pcm_mmap_status64 structure from the ioctl command number,
we rely on one quirk in the structure definition: snd_pcm_mmap_status
must be aligned to alignof(time_t), which leads the compiler to insert
four bytes of padding in struct snd_pcm_sync_ptr after 'flags' and a
corresponding change in the size of snd_pcm_sync_ptr itself. On x86-32
(and only there), the compiler doesn't use 64-bit alignment in structure,
so I'm adding an explicit pad in the structure that has no effect on the
existing 64-bit architectures but ensures that the layout matches for x86.
The snd_pcm_uframes_t type compatibility requires another hack: we can't
easily make that 64 bit wide, so I leave the type as 'unsigned long',
but add padding before and after it, to ensure that the data is properly
aligned to the respective 64-bit field in the in-kernel structure.
For the SNDRV_PCM_MMAP_OFFSET_STATUS/CONTROL constants that are used
as the virtual file offset in the mmap() function, we also have to
introduce new constants that depend on hte __USE_TIME_BITS64 macro:
The existing macros are renamed to SNDRV_PCM_MMAP_OFFSET_STATUS_OLD
and SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD, they continue to work fine on
64-bit architectures, but stop working on native 32-bit user space.
The replacement _NEW constants are now used by default for user space
built with __USE_TIME_BITS64, those now work on all new kernels for x86,
ppc and alpha (32 and 64 bit, native and compat). It might be a good idea
for a future alsa-lib to support both the _OLD and _NEW macros and use
the corresponding structures directly. Unmodified alsa-lib source code
will retain the current behavior, so it will no longer be able to use
mmap() for the status/control structures on 32-bit systems, until either
the C library gets updated to 64-bit time_t or alsa-lib gets updated to
support both mmap() layouts.
Co-developed-with: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2018-04-24 20:06:15 +08:00
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2018-04-24 20:06:08 +08:00
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2005-04-16 15:20:36 -07:00
|
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|
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2009-12-17 17:34:39 +01:00
|
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|
2009-06-08 15:58:48 +02:00
|
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2011-07-23 12:36:25 +12:00
|
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2014-02-04 18:19:48 +01:00
|
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2009-03-03 17:00:15 +01:00
|
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2005-04-16 15:20:36 -07:00
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2024-08-09 22:06:45 +08:00
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2005-04-16 15:20:36 -07:00
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2010-03-26 16:07:25 +02:00
|
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|
ALSA: pcm: Replace PCM hwptr tracking with tracepoints
ALSA PCM core has a mechanism tracking the PCM hwptr updates for
analyzing XRUNs. But its log is limited (up to 10) and its log output
is a kernel message, which is hard to handle.
In this patch, the hwptr logging is moved to the tracing
infrastructure instead of its own. Not only the hwptr updates but
also XRUN and hwptr errors are recorded on the trace log, so that user
can see such events at the exact timing.
The new "snd_pcm" entry will appear in the tracing events:
# ls -F /sys/kernel/debug/tracing/events/snd_pcm
enable filter hw_ptr_error/ hwptr/ xrun/
The hwptr is for the regular hwptr update events. An event trace
looks like:
aplay-26187 [004] d..3 4012.834761: hwptr: pcmC0D0p/sub0: POS: pos=488, old=0, base=0, period=1024, buf=16384
"POS" shows the hwptr update by the explicit position update call and
"IRQ" means the hwptr update by the interrupt,
i.e. snd_pcm_period_elapsed() call. The "pos" is the passed
ring-buffer offset by the caller, "old" is the previous hwptr, "base"
is the hwptr base position, "period" and "buf" are period- and
buffer-size of the target PCM substream.
(Note that the hwptr position displayed here isn't the ring-buffer
offset. It increments up to the PCM position boundary.)
The XRUN event appears similarly, but without "pos" field.
The hwptr error events appear with the PCM identifier and its reason
string, such as "Lost interrupt?".
The XRUN and hwptr error reports on kernel message are still left, can
be turned on/off via xrun_debug proc like before. But the bit 3, 4, 5
and 6 bits of xrun_debug proc are dropped by this patch. Also, along
with the change, the message strings have been reformatted to be a bit
more consistent.
Last but not least, the hwptr reporting is enabled only when
CONFIG_SND_PCM_XRUN_DEBUG is set.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-11-04 12:45:59 +01:00
|
|
|
|
2009-12-20 11:47:57 +01:00
|
|
|
|
ALSA: pcm: Replace PCM hwptr tracking with tracepoints
ALSA PCM core has a mechanism tracking the PCM hwptr updates for
analyzing XRUNs. But its log is limited (up to 10) and its log output
is a kernel message, which is hard to handle.
In this patch, the hwptr logging is moved to the tracing
infrastructure instead of its own. Not only the hwptr updates but
also XRUN and hwptr errors are recorded on the trace log, so that user
can see such events at the exact timing.
The new "snd_pcm" entry will appear in the tracing events:
# ls -F /sys/kernel/debug/tracing/events/snd_pcm
enable filter hw_ptr_error/ hwptr/ xrun/
The hwptr is for the regular hwptr update events. An event trace
looks like:
aplay-26187 [004] d..3 4012.834761: hwptr: pcmC0D0p/sub0: POS: pos=488, old=0, base=0, period=1024, buf=16384
"POS" shows the hwptr update by the explicit position update call and
"IRQ" means the hwptr update by the interrupt,
i.e. snd_pcm_period_elapsed() call. The "pos" is the passed
ring-buffer offset by the caller, "old" is the previous hwptr, "base"
is the hwptr base position, "period" and "buf" are period- and
buffer-size of the target PCM substream.
(Note that the hwptr position displayed here isn't the ring-buffer
offset. It increments up to the PCM position boundary.)
The XRUN event appears similarly, but without "pos" field.
The hwptr error events appear with the PCM identifier and its reason
string, such as "Lost interrupt?".
The XRUN and hwptr error reports on kernel message are still left, can
be turned on/off via xrun_debug proc like before. But the bit 3, 4, 5
and 6 bits of xrun_debug proc are dropped by this patch. Also, along
with the change, the message strings have been reformatted to be a bit
more consistent.
Last but not least, the hwptr reporting is enabled only when
CONFIG_SND_PCM_XRUN_DEBUG is set.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-11-04 12:45:59 +01:00
|
|
|
|
2009-12-20 11:47:57 +01:00
|
|
|
|
ALSA: pcm: Replace PCM hwptr tracking with tracepoints
ALSA PCM core has a mechanism tracking the PCM hwptr updates for
analyzing XRUNs. But its log is limited (up to 10) and its log output
is a kernel message, which is hard to handle.
In this patch, the hwptr logging is moved to the tracing
infrastructure instead of its own. Not only the hwptr updates but
also XRUN and hwptr errors are recorded on the trace log, so that user
can see such events at the exact timing.
The new "snd_pcm" entry will appear in the tracing events:
# ls -F /sys/kernel/debug/tracing/events/snd_pcm
enable filter hw_ptr_error/ hwptr/ xrun/
The hwptr is for the regular hwptr update events. An event trace
looks like:
aplay-26187 [004] d..3 4012.834761: hwptr: pcmC0D0p/sub0: POS: pos=488, old=0, base=0, period=1024, buf=16384
"POS" shows the hwptr update by the explicit position update call and
"IRQ" means the hwptr update by the interrupt,
i.e. snd_pcm_period_elapsed() call. The "pos" is the passed
ring-buffer offset by the caller, "old" is the previous hwptr, "base"
is the hwptr base position, "period" and "buf" are period- and
buffer-size of the target PCM substream.
(Note that the hwptr position displayed here isn't the ring-buffer
offset. It increments up to the PCM position boundary.)
The XRUN event appears similarly, but without "pos" field.
The hwptr error events appear with the PCM identifier and its reason
string, such as "Lost interrupt?".
The XRUN and hwptr error reports on kernel message are still left, can
be turned on/off via xrun_debug proc like before. But the bit 3, 4, 5
and 6 bits of xrun_debug proc are dropped by this patch. Also, along
with the change, the message strings have been reformatted to be a bit
more consistent.
Last but not least, the hwptr reporting is enabled only when
CONFIG_SND_PCM_XRUN_DEBUG is set.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-11-04 12:45:59 +01:00
|
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2009-12-20 11:47:57 +01:00
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2005-04-16 15:20:36 -07:00
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2009-12-20 11:47:57 +01:00
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2010-01-07 15:36:31 +01:00
|
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2005-04-16 15:20:36 -07:00
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2018-04-11 17:56:52 +02:00
|
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2005-04-16 15:20:36 -07:00
|
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2022-09-26 15:55:48 +02:00
|
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2009-08-20 16:40:16 +02:00
|
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2005-04-16 15:20:36 -07:00
|
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2009-08-20 16:40:16 +02:00
|
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2018-07-04 14:46:27 +02:00
|
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2009-08-20 16:40:16 +02:00
|
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2005-04-16 15:20:36 -07:00
|
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2010-06-27 00:13:20 +02:00
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2005-04-16 15:20:36 -07:00
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2015-02-13 15:14:06 -06:00
|
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2018-04-24 20:06:08 +08:00
|
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2015-02-13 15:14:06 -06:00
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2018-04-24 20:06:08 +08:00
|
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2015-02-13 15:14:06 -06:00
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2018-04-24 20:06:08 +08:00
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2015-02-13 15:14:06 -06:00
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2018-04-24 20:06:08 +08:00
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|
ALSA: add new 32-bit layout for snd_pcm_mmap_status/control
The snd_pcm_mmap_status and snd_pcm_mmap_control interfaces are one of the
trickiest areas to get right when moving to 64-bit time_t in user space.
The snd_pcm_mmap_status structure layout is incompatible with user space
that uses a 64-bit time_t, so we need a new layout for it. Since the
SNDRV_PCM_IOCTL_SYNC_PTR ioctl combines it with snd_pcm_mmap_control
into snd_pcm_sync_ptr, we need to change those two as well.
Both structures are also exported via an mmap() operation on certain
architectures, and this suffers from incompatibility between 32-bit
and 64-bit user space. As we have to change both structures anyway,
this is a good opportunity to fix the mmap() problem as well, so let's
standardize on the existing 64-bit layout of the structure where possible.
The downside is that we lose mmap() support for existing 32-bit x86 and
powerpc applications, adding that would introduce very noticeable runtime
overhead and complexity. My assumption here is that not too many people
will miss the removed feature, given that:
- Almost all x86 and powerpc users these days are on 64-bit kernels,
the majority of today's 32-bit users are on architectures that never
supported mmap (ARM, MIPS, ...).
- It never worked in compat mode (it was intentionally disabled there)
- The application already needs to work with a fallback to
SNDRV_PCM_IOCTL_SYNC_PTR, which will keep working with both the old
and new structure layout.
Both the ioctl() and mmap() based interfaces are changed at the same
time, as they are based on the same structures. Unlike other interfaces,
we change the uapi header to export both the traditional structure and
a version that is portable between 32-bit and 64-bit user space code
and that corresponds to the existing 64-bit layout. We further check the
__USE_TIME_BITS64 macro that will be defined by future C library versions
whenever we use the new time_t definition, so any existing user space
source code will not see any changes until it gets rebuilt against a new
C library. However, the new structures are all visible in addition to the
old ones, allowing applications to explicitly request the new structures.
In order to detect the difference between the old snd_pcm_mmap_status and
the new __snd_pcm_mmap_status64 structure from the ioctl command number,
we rely on one quirk in the structure definition: snd_pcm_mmap_status
must be aligned to alignof(time_t), which leads the compiler to insert
four bytes of padding in struct snd_pcm_sync_ptr after 'flags' and a
corresponding change in the size of snd_pcm_sync_ptr itself. On x86-32
(and only there), the compiler doesn't use 64-bit alignment in structure,
so I'm adding an explicit pad in the structure that has no effect on the
existing 64-bit architectures but ensures that the layout matches for x86.
The snd_pcm_uframes_t type compatibility requires another hack: we can't
easily make that 64 bit wide, so I leave the type as 'unsigned long',
but add padding before and after it, to ensure that the data is properly
aligned to the respective 64-bit field in the in-kernel structure.
For the SNDRV_PCM_MMAP_OFFSET_STATUS/CONTROL constants that are used
as the virtual file offset in the mmap() function, we also have to
introduce new constants that depend on hte __USE_TIME_BITS64 macro:
The existing macros are renamed to SNDRV_PCM_MMAP_OFFSET_STATUS_OLD
and SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD, they continue to work fine on
64-bit architectures, but stop working on native 32-bit user space.
The replacement _NEW constants are now used by default for user space
built with __USE_TIME_BITS64, those now work on all new kernels for x86,
ppc and alpha (32 and 64 bit, native and compat). It might be a good idea
for a future alsa-lib to support both the _OLD and _NEW macros and use
the corresponding structures directly. Unmodified alsa-lib source code
will retain the current behavior, so it will no longer be able to use
mmap() for the status/control structures on 32-bit systems, until either
the C library gets updated to 64-bit time_t or alsa-lib gets updated to
support both mmap() layouts.
Co-developed-with: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2018-04-24 20:06:15 +08:00
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2017-11-21 09:29:28 +01:00
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|
|
2015-02-13 15:14:06 -06:00
|
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|
|
2018-04-24 20:06:08 +08:00
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2015-02-13 15:14:06 -06:00
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2018-04-24 20:06:08 +08:00
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2015-02-13 15:14:06 -06:00
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2010-01-05 17:19:34 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2010-01-05 17:19:34 +01:00
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2009-04-10 12:28:58 +02:00
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2012-05-22 14:54:02 -05:00
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2018-04-24 20:06:08 +08:00
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2012-10-22 16:42:14 -05:00
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2005-04-16 15:20:36 -07:00
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2009-04-10 12:28:58 +02:00
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2012-05-22 14:54:02 -05:00
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2010-01-05 17:19:34 +01:00
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2012-05-22 14:54:02 -05:00
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2012-10-22 16:42:15 -05:00
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2015-02-13 15:14:06 -06:00
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2012-05-22 14:54:02 -05:00
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2015-02-13 15:14:06 -06:00
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2018-04-24 20:06:08 +08:00
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2015-02-13 15:14:06 -06:00
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2018-04-24 20:06:08 +08:00
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2012-10-22 16:42:15 -05:00
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2005-04-16 15:20:36 -07:00
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2018-07-04 14:46:27 +02:00
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2005-04-16 15:20:36 -07:00
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2010-01-05 17:19:34 +01:00
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2014-02-04 18:19:48 +01:00
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2010-01-05 17:19:34 +01:00
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2011-07-23 12:36:25 +12:00
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2014-02-04 18:19:48 +01:00
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2016-03-10 20:56:20 +01:00
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2014-02-04 18:19:48 +01:00
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2010-01-05 17:19:34 +01:00
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2009-07-23 11:04:13 +02:00
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2010-01-05 17:19:34 +01:00
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ALSA: pcm: Replace PCM hwptr tracking with tracepoints
ALSA PCM core has a mechanism tracking the PCM hwptr updates for
analyzing XRUNs. But its log is limited (up to 10) and its log output
is a kernel message, which is hard to handle.
In this patch, the hwptr logging is moved to the tracing
infrastructure instead of its own. Not only the hwptr updates but
also XRUN and hwptr errors are recorded on the trace log, so that user
can see such events at the exact timing.
The new "snd_pcm" entry will appear in the tracing events:
# ls -F /sys/kernel/debug/tracing/events/snd_pcm
enable filter hw_ptr_error/ hwptr/ xrun/
The hwptr is for the regular hwptr update events. An event trace
looks like:
aplay-26187 [004] d..3 4012.834761: hwptr: pcmC0D0p/sub0: POS: pos=488, old=0, base=0, period=1024, buf=16384
"POS" shows the hwptr update by the explicit position update call and
"IRQ" means the hwptr update by the interrupt,
i.e. snd_pcm_period_elapsed() call. The "pos" is the passed
ring-buffer offset by the caller, "old" is the previous hwptr, "base"
is the hwptr base position, "period" and "buf" are period- and
buffer-size of the target PCM substream.
(Note that the hwptr position displayed here isn't the ring-buffer
offset. It increments up to the PCM position boundary.)
The XRUN event appears similarly, but without "pos" field.
The hwptr error events appear with the PCM identifier and its reason
string, such as "Lost interrupt?".
The XRUN and hwptr error reports on kernel message are still left, can
be turned on/off via xrun_debug proc like before. But the bit 3, 4, 5
and 6 bits of xrun_debug proc are dropped by this patch. Also, along
with the change, the message strings have been reformatted to be a bit
more consistent.
Last but not least, the hwptr reporting is enabled only when
CONFIG_SND_PCM_XRUN_DEBUG is set.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-11-04 12:45:59 +01:00
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2009-03-03 17:00:15 +01:00
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2010-01-05 17:19:34 +01:00
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2010-01-26 17:08:24 +01:00
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2010-01-05 17:19:34 +01:00
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2010-08-18 14:16:54 +02:00
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2012-05-22 14:54:02 -05:00
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2015-05-13 22:39:03 +08:00
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2010-08-18 14:16:54 +02:00
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2012-10-22 16:42:14 -05:00
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2010-08-18 14:16:54 +02:00
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2012-10-22 16:42:14 -05:00
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2010-08-18 14:16:54 +02:00
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2005-04-16 15:20:36 -07:00
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2010-01-05 17:19:34 +01:00
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2012-10-22 16:42:14 -05:00
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2010-01-05 17:19:34 +01:00
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2012-10-22 16:42:14 -05:00
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2010-01-05 17:19:34 +01:00
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2010-05-25 09:01:46 +02:00
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2010-11-15 10:46:23 +01:00
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2010-11-18 09:43:52 +01:00
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2011-04-01 11:58:25 +02:00
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2010-11-18 09:43:52 +01:00
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2012-05-22 14:54:02 -05:00
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2010-11-18 09:53:07 +01:00
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2010-11-18 09:43:52 +01:00
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2011-04-01 11:58:25 +02:00
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2010-11-18 09:43:52 +01:00
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2012-10-22 16:42:14 -05:00
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2010-11-18 09:43:52 +01:00
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2012-10-22 16:42:14 -05:00
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2010-11-18 09:43:52 +01:00
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2010-11-15 10:46:23 +01:00
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2010-11-18 09:43:52 +01:00
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2010-11-15 10:46:23 +01:00
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2010-01-05 17:19:34 +01:00
|
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2010-01-08 08:43:01 +01:00
|
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|
|
ALSA: pcm: Replace PCM hwptr tracking with tracepoints
ALSA PCM core has a mechanism tracking the PCM hwptr updates for
analyzing XRUNs. But its log is limited (up to 10) and its log output
is a kernel message, which is hard to handle.
In this patch, the hwptr logging is moved to the tracing
infrastructure instead of its own. Not only the hwptr updates but
also XRUN and hwptr errors are recorded on the trace log, so that user
can see such events at the exact timing.
The new "snd_pcm" entry will appear in the tracing events:
# ls -F /sys/kernel/debug/tracing/events/snd_pcm
enable filter hw_ptr_error/ hwptr/ xrun/
The hwptr is for the regular hwptr update events. An event trace
looks like:
aplay-26187 [004] d..3 4012.834761: hwptr: pcmC0D0p/sub0: POS: pos=488, old=0, base=0, period=1024, buf=16384
"POS" shows the hwptr update by the explicit position update call and
"IRQ" means the hwptr update by the interrupt,
i.e. snd_pcm_period_elapsed() call. The "pos" is the passed
ring-buffer offset by the caller, "old" is the previous hwptr, "base"
is the hwptr base position, "period" and "buf" are period- and
buffer-size of the target PCM substream.
(Note that the hwptr position displayed here isn't the ring-buffer
offset. It increments up to the PCM position boundary.)
The XRUN event appears similarly, but without "pos" field.
The hwptr error events appear with the PCM identifier and its reason
string, such as "Lost interrupt?".
The XRUN and hwptr error reports on kernel message are still left, can
be turned on/off via xrun_debug proc like before. But the bit 3, 4, 5
and 6 bits of xrun_debug proc are dropped by this patch. Also, along
with the change, the message strings have been reformatted to be a bit
more consistent.
Last but not least, the hwptr reporting is enabled only when
CONFIG_SND_PCM_XRUN_DEBUG is set.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-11-04 12:45:59 +01:00
|
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2010-01-05 17:19:34 +01:00
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2009-05-27 10:53:33 +02:00
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2009-12-17 17:34:39 +01:00
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2009-05-27 10:53:33 +02:00
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2009-04-28 12:07:08 +02:00
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2010-01-05 17:19:34 +01:00
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2009-05-28 12:31:56 +02:00
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2012-05-22 14:54:02 -05:00
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2009-04-10 12:28:58 +02:00
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2010-01-05 17:19:34 +01:00
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2010-01-13 08:12:31 +01:00
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2010-01-05 17:19:34 +01:00
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2012-10-22 16:42:14 -05:00
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2010-01-05 17:19:34 +01:00
|
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2012-10-22 16:42:14 -05:00
|
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2010-01-05 17:19:34 +01:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ALSA: pcm: Replace PCM hwptr tracking with tracepoints
ALSA PCM core has a mechanism tracking the PCM hwptr updates for
analyzing XRUNs. But its log is limited (up to 10) and its log output
is a kernel message, which is hard to handle.
In this patch, the hwptr logging is moved to the tracing
infrastructure instead of its own. Not only the hwptr updates but
also XRUN and hwptr errors are recorded on the trace log, so that user
can see such events at the exact timing.
The new "snd_pcm" entry will appear in the tracing events:
# ls -F /sys/kernel/debug/tracing/events/snd_pcm
enable filter hw_ptr_error/ hwptr/ xrun/
The hwptr is for the regular hwptr update events. An event trace
looks like:
aplay-26187 [004] d..3 4012.834761: hwptr: pcmC0D0p/sub0: POS: pos=488, old=0, base=0, period=1024, buf=16384
"POS" shows the hwptr update by the explicit position update call and
"IRQ" means the hwptr update by the interrupt,
i.e. snd_pcm_period_elapsed() call. The "pos" is the passed
ring-buffer offset by the caller, "old" is the previous hwptr, "base"
is the hwptr base position, "period" and "buf" are period- and
buffer-size of the target PCM substream.
(Note that the hwptr position displayed here isn't the ring-buffer
offset. It increments up to the PCM position boundary.)
The XRUN event appears similarly, but without "pos" field.
The hwptr error events appear with the PCM identifier and its reason
string, such as "Lost interrupt?".
The XRUN and hwptr error reports on kernel message are still left, can
be turned on/off via xrun_debug proc like before. But the bit 3, 4, 5
and 6 bits of xrun_debug proc are dropped by this patch. Also, along
with the change, the message strings have been reformatted to be a bit
more consistent.
Last but not least, the hwptr reporting is enabled only when
CONFIG_SND_PCM_XRUN_DEBUG is set.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-11-04 12:45:59 +01:00
|
|
|
|
|
|
|
|
|
2009-04-10 12:28:58 +02:00
|
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|
2010-01-13 08:12:31 +01:00
|
|
|
|
2010-01-05 17:19:34 +01:00
|
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|
2010-01-13 08:12:31 +01:00
|
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2009-04-10 12:28:58 +02:00
|
|
|
|
2009-04-28 12:07:08 +02:00
|
|
|
|
2009-04-10 12:28:58 +02:00
|
|
|
|
ALSA: pcm: Replace PCM hwptr tracking with tracepoints
ALSA PCM core has a mechanism tracking the PCM hwptr updates for
analyzing XRUNs. But its log is limited (up to 10) and its log output
is a kernel message, which is hard to handle.
In this patch, the hwptr logging is moved to the tracing
infrastructure instead of its own. Not only the hwptr updates but
also XRUN and hwptr errors are recorded on the trace log, so that user
can see such events at the exact timing.
The new "snd_pcm" entry will appear in the tracing events:
# ls -F /sys/kernel/debug/tracing/events/snd_pcm
enable filter hw_ptr_error/ hwptr/ xrun/
The hwptr is for the regular hwptr update events. An event trace
looks like:
aplay-26187 [004] d..3 4012.834761: hwptr: pcmC0D0p/sub0: POS: pos=488, old=0, base=0, period=1024, buf=16384
"POS" shows the hwptr update by the explicit position update call and
"IRQ" means the hwptr update by the interrupt,
i.e. snd_pcm_period_elapsed() call. The "pos" is the passed
ring-buffer offset by the caller, "old" is the previous hwptr, "base"
is the hwptr base position, "period" and "buf" are period- and
buffer-size of the target PCM substream.
(Note that the hwptr position displayed here isn't the ring-buffer
offset. It increments up to the PCM position boundary.)
The XRUN event appears similarly, but without "pos" field.
The hwptr error events appear with the PCM identifier and its reason
string, such as "Lost interrupt?".
The XRUN and hwptr error reports on kernel message are still left, can
be turned on/off via xrun_debug proc like before. But the bit 3, 4, 5
and 6 bits of xrun_debug proc are dropped by this patch. Also, along
with the change, the message strings have been reformatted to be a bit
more consistent.
Last but not least, the hwptr reporting is enabled only when
CONFIG_SND_PCM_XRUN_DEBUG is set.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-11-04 12:45:59 +01:00
|
|
|
|
|
|
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2009-03-03 17:00:15 +01:00
|
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2010-01-05 17:19:34 +01:00
|
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2009-03-03 17:00:15 +01:00
|
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2010-01-05 17:19:34 +01:00
|
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|
2010-11-15 10:46:23 +01:00
|
|
|
|
2015-02-13 15:14:06 -06:00
|
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|
|
2020-05-18 12:30:38 +08:00
|
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|
2015-02-13 15:14:06 -06:00
|
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|
2010-01-05 17:19:34 +01:00
|
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2015-02-13 15:14:06 -06:00
|
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|
2009-06-07 12:09:17 +02:00
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2023-05-05 17:52:38 +02:00
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2010-01-26 17:08:24 +01:00
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2010-05-21 09:15:59 +02:00
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2010-01-26 17:08:24 +01:00
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2009-03-03 17:00:15 +01:00
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2005-04-16 15:20:36 -07:00
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2012-05-22 14:54:02 -05:00
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2012-10-22 16:42:14 -05:00
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2005-04-16 15:20:36 -07:00
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2015-02-13 15:14:06 -06:00
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2012-10-22 16:42:15 -05:00
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2010-01-07 15:36:31 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2010-01-05 17:19:34 +01:00
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2005-04-16 15:20:36 -07:00
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2013-05-24 15:18:10 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2024-06-25 19:25:47 +02:00
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2005-04-16 15:20:36 -07:00
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2024-06-25 19:25:47 +02:00
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2005-04-16 15:20:36 -07:00
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2024-06-25 19:25:47 +02:00
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2005-04-16 15:20:36 -07:00
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2024-06-25 19:25:47 +02:00
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2005-04-16 15:20:36 -07:00
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2024-06-25 19:25:47 +02:00
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2024-07-05 09:58:28 +02:00
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2024-06-25 19:25:47 +02:00
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2005-04-16 15:20:36 -07:00
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2024-07-05 08:35:53 +02:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2009-06-05 17:40:04 +02:00
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2005-04-16 15:20:36 -07:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2008-08-08 17:09:09 +02:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2018-07-10 17:28:45 +02:00
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2008-08-08 17:09:09 +02:00
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2005-04-16 15:20:36 -07:00
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2018-07-10 17:28:45 +02:00
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2005-04-16 15:20:36 -07:00
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2018-07-10 17:28:45 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2018-07-10 17:28:45 +02:00
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2008-08-08 17:09:09 +02:00
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2005-04-16 15:20:36 -07:00
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2018-07-10 17:28:45 +02:00
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2005-04-16 15:20:36 -07:00
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2018-07-10 17:28:45 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-09-07 13:38:19 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-09-07 13:38:19 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-09-07 13:38:19 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-09-07 13:38:19 +02:00
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2005-04-16 15:20:36 -07:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2015-10-28 11:37:53 +01:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2009-12-21 17:07:08 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2009-12-21 17:07:08 +01:00
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2005-04-16 15:20:36 -07:00
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2009-12-19 18:31:04 +01:00
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2005-04-16 15:20:36 -07:00
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2009-12-21 17:07:08 +01:00
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2005-04-16 15:20:36 -07:00
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2009-12-21 17:07:08 +01:00
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2005-04-16 15:20:36 -07:00
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2009-12-19 18:31:04 +01:00
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2005-04-16 15:20:36 -07:00
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2009-12-21 17:07:08 +01:00
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2005-04-16 15:20:36 -07:00
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2009-12-21 17:07:08 +01:00
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2005-04-16 15:20:36 -07:00
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2009-12-21 17:07:08 +01:00
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2005-04-16 15:20:36 -07:00
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2009-12-21 17:07:08 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2005-09-07 13:38:19 +02:00
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2005-11-17 13:59:38 +01:00
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2005-09-07 13:38:19 +02:00
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2005-04-16 15:20:36 -07:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2015-10-28 11:37:53 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2012-03-14 19:48:43 +00:00
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2005-04-16 15:20:36 -07:00
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2009-08-25 08:15:41 +02:00
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2007-02-01 14:53:49 +01:00
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2009-08-25 08:15:41 +02:00
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2005-04-16 15:20:36 -07:00
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2009-08-25 08:15:41 +02:00
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2005-04-16 15:20:36 -07:00
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2009-08-25 08:15:41 +02:00
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2005-04-16 15:20:36 -07:00
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2009-08-25 08:15:41 +02:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2015-01-28 15:16:06 +01:00
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2014-09-07 21:43:07 +02:00
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2005-04-16 15:20:36 -07:00
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2014-09-07 21:43:07 +02:00
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2005-04-16 15:20:36 -07:00
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2014-09-07 21:43:41 +02:00
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2005-04-16 15:20:36 -07:00
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2014-09-07 21:43:07 +02:00
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2005-04-16 15:20:36 -07:00
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2014-09-07 21:43:41 +02:00
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2005-04-16 15:20:36 -07:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2020-12-14 19:03:59 -08:00
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2010-12-21 00:03:17 +01:00
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2005-04-16 15:20:36 -07:00
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2010-12-21 00:03:17 +01:00
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2005-04-16 15:20:36 -07:00
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2010-12-21 00:03:17 +01:00
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2008-08-08 17:09:09 +02:00
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2010-12-21 00:03:17 +01:00
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2005-04-16 15:20:36 -07:00
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2010-12-21 00:03:17 +01:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-09-07 13:38:19 +02:00
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2008-10-15 14:38:40 -07:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-09-07 13:38:19 +02:00
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2008-10-15 14:38:40 -07:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2014-02-20 12:13:52 +09:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-09-07 13:38:19 +02:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-09-07 13:38:19 +02:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-09-07 13:38:19 +02:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2012-07-05 12:15:01 +01:00
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2005-04-16 15:20:36 -07:00
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2012-07-05 12:15:01 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2015-01-28 15:16:06 +01:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2015-10-28 11:37:53 +01:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-09-07 13:38:19 +02:00
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2005-11-17 13:59:38 +01:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2015-10-28 11:37:53 +01:00
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2005-04-16 15:20:36 -07:00
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2015-10-28 11:37:53 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2015-10-28 11:37:53 +01:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-09-07 13:38:19 +02:00
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2005-11-17 13:59:38 +01:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2015-10-28 11:37:53 +01:00
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2005-04-16 15:20:36 -07:00
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2015-10-28 11:37:53 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2017-05-17 08:48:20 +09:00
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2014-12-29 18:43:37 +01:00
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2014-12-29 18:43:36 +01:00
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2014-12-29 18:43:37 +01:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-09-07 13:38:19 +02:00
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2013-03-11 22:05:14 +01:00
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2014-12-29 18:43:37 +01:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2014-09-07 21:43:07 +02:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-09-07 13:38:19 +02:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2020-01-05 15:47:20 +01:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-09-07 13:38:19 +02:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2011-09-16 23:03:02 +02:00
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2013-03-11 22:05:14 +01:00
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2011-09-16 23:03:02 +02:00
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2005-11-17 13:59:38 +01:00
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2005-05-18 18:02:04 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-09-07 13:38:19 +02:00
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2008-10-15 14:38:40 -07:00
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2005-04-16 15:20:36 -07:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-05-18 18:02:04 +02:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2018-01-02 11:00:57 +01:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-09-07 13:38:19 +02:00
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2008-10-15 14:38:40 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-04-16 15:20:36 -07:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2018-01-01 09:50:50 +01:00
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2008-08-08 17:09:09 +02:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-11-17 13:59:38 +01:00
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2005-05-18 18:02:04 +02:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2018-01-02 11:00:57 +01:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-09-07 13:38:19 +02:00
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2008-10-15 14:38:40 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 14:38:40 -07:00
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2005-04-16 15:20:36 -07:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2018-01-01 09:50:50 +01:00
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2008-08-08 17:09:09 +02:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2023-11-17 13:05:58 +01:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2024-02-27 09:53:04 +01:00
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2005-04-16 15:20:36 -07:00
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2012-10-22 16:42:14 -05:00
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2005-04-16 15:20:36 -07:00
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2012-10-22 16:42:14 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2009-04-27 09:44:40 +02:00
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2014-09-21 22:50:57 +02:00
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2009-04-27 09:44:40 +02:00
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2014-09-21 22:50:57 +02:00
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2021-08-27 08:37:35 -07:00
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2009-04-27 09:44:40 +02:00
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2024-06-25 19:25:46 +02:00
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2024-06-25 19:25:47 +02:00
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2024-06-25 19:25:46 +02:00
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2024-06-25 19:25:47 +02:00
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2024-06-25 19:25:46 +02:00
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2005-04-16 15:20:36 -07:00
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2013-03-11 22:05:14 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2009-04-27 09:44:40 +02:00
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2024-06-25 19:25:46 +02:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2005-04-16 15:20:36 -07:00
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2021-06-10 12:17:31 +09:00
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2005-04-16 15:20:36 -07:00
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2021-06-10 12:17:31 +09:00
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2005-04-16 15:20:36 -07:00
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2021-06-10 12:17:31 +09:00
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2005-04-16 15:20:36 -07:00
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2021-06-10 12:17:31 +09:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2019-11-13 01:17:14 +08:00
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2021-06-10 12:17:31 +09:00
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2019-11-13 01:17:14 +08:00
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2005-04-16 15:20:36 -07:00
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2010-01-05 17:19:34 +01:00
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2005-04-16 15:20:36 -07:00
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2015-10-16 17:57:46 +08:00
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2005-04-16 15:20:36 -07:00
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2015-10-16 17:57:46 +08:00
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2005-04-16 15:20:36 -07:00
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2022-07-28 14:59:44 +02:00
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2021-06-10 12:17:31 +09:00
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2024-02-27 09:53:04 +01:00
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2021-06-10 12:17:31 +09:00
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2005-04-16 15:20:36 -07:00
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2006-04-28 15:13:40 +02:00
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2008-01-08 18:08:14 +01:00
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2010-06-27 00:13:20 +02:00
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2008-01-08 18:08:14 +01:00
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2017-06-20 12:06:13 +02:00
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2008-01-08 18:08:14 +01:00
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2011-05-26 08:09:38 +02:00
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2008-01-08 18:08:14 +01:00
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2011-09-15 08:49:25 +02:00
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2011-05-26 08:09:38 +02:00
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2018-07-06 13:50:36 +01:00
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|
ALSA: pcm: fix wait_time calculations
... in wait_for_avail() and snd_pcm_drain().
t was calculated in seconds, so it would be pretty much always zero, to
be subsequently de-facto ignored due to being max(t, 10)'d. And then it
(i.e., 10) would be treated as secs, which doesn't seem right.
However, fixing it to properly calculate msecs would potentially cause
timeouts when using twice the period size for the default timeout (which
seems reasonable to me), so instead use the buffer size plus 10 percent
to be on the safe side ... but that still seems insufficient, presumably
because the hardware typically needs a moment to fire up. To compensate
for this, we up the minimal timeout to 100ms, which is still two orders
of magnitude less than the bogus minimum.
substream->wait_time was also misinterpreted as jiffies, despite being
documented as being in msecs. Only the soc/sof driver sets it - to 500,
which looks very much like msecs were intended.
Speaking of which, shouldn't snd_pcm_drain() also use substream->
wait_time?
As a drive-by, make the debug messages on timeout less confusing.
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230405201219.2197774-1-oswald.buddenhagen@gmx.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2023-04-05 22:12:19 +02:00
|
|
|
|
2018-07-06 13:50:36 +01:00
|
|
|
|
|
|
|
|
|
ALSA: pcm: fix wait_time calculations
... in wait_for_avail() and snd_pcm_drain().
t was calculated in seconds, so it would be pretty much always zero, to
be subsequently de-facto ignored due to being max(t, 10)'d. And then it
(i.e., 10) would be treated as secs, which doesn't seem right.
However, fixing it to properly calculate msecs would potentially cause
timeouts when using twice the period size for the default timeout (which
seems reasonable to me), so instead use the buffer size plus 10 percent
to be on the safe side ... but that still seems insufficient, presumably
because the hardware typically needs a moment to fire up. To compensate
for this, we up the minimal timeout to 100ms, which is still two orders
of magnitude less than the bogus minimum.
substream->wait_time was also misinterpreted as jiffies, despite being
documented as being in msecs. Only the soc/sof driver sets it - to 500,
which looks very much like msecs were intended.
Speaking of which, shouldn't snd_pcm_drain() also use substream->
wait_time?
As a drive-by, make the debug messages on timeout less confusing.
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230405201219.2197774-1-oswald.buddenhagen@gmx.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2023-04-05 22:12:19 +02:00
|
|
|
|
2018-07-06 13:50:36 +01:00
|
|
|
|
|
|
|
|
|
2011-05-26 08:09:38 +02:00
|
|
|
|
ALSA: pcm: fix wait_time calculations
... in wait_for_avail() and snd_pcm_drain().
t was calculated in seconds, so it would be pretty much always zero, to
be subsequently de-facto ignored due to being max(t, 10)'d. And then it
(i.e., 10) would be treated as secs, which doesn't seem right.
However, fixing it to properly calculate msecs would potentially cause
timeouts when using twice the period size for the default timeout (which
seems reasonable to me), so instead use the buffer size plus 10 percent
to be on the safe side ... but that still seems insufficient, presumably
because the hardware typically needs a moment to fire up. To compensate
for this, we up the minimal timeout to 100ms, which is still two orders
of magnitude less than the bogus minimum.
substream->wait_time was also misinterpreted as jiffies, despite being
documented as being in msecs. Only the soc/sof driver sets it - to 500,
which looks very much like msecs were intended.
Speaking of which, shouldn't snd_pcm_drain() also use substream->
wait_time?
As a drive-by, make the debug messages on timeout less confusing.
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230405201219.2197774-1-oswald.buddenhagen@gmx.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2023-04-05 22:12:19 +02:00
|
|
|
|
2011-05-26 08:09:38 +02:00
|
|
|
|
2011-09-15 08:49:25 +02:00
|
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|
2008-01-08 18:08:14 +01:00
|
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2011-09-15 08:49:25 +02:00
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|
2018-04-11 17:56:52 +02:00
|
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|
2011-09-15 08:49:25 +02:00
|
|
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|
2008-01-08 18:08:14 +01:00
|
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|
2011-09-15 08:49:25 +02:00
|
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|
2008-01-08 18:08:14 +01:00
|
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|
2011-09-15 08:49:25 +02:00
|
|
|
|
2022-09-26 15:55:48 +02:00
|
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|
2008-01-08 18:08:14 +01:00
|
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2013-12-17 23:02:24 +09:00
|
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|
2008-01-08 18:08:14 +01:00
|
|
|
|
|
|
|
|
|
2014-02-04 18:19:48 +01:00
|
|
|
|
ALSA: pcm: fix wait_time calculations
... in wait_for_avail() and snd_pcm_drain().
t was calculated in seconds, so it would be pretty much always zero, to
be subsequently de-facto ignored due to being max(t, 10)'d. And then it
(i.e., 10) would be treated as secs, which doesn't seem right.
However, fixing it to properly calculate msecs would potentially cause
timeouts when using twice the period size for the default timeout (which
seems reasonable to me), so instead use the buffer size plus 10 percent
to be on the safe side ... but that still seems insufficient, presumably
because the hardware typically needs a moment to fire up. To compensate
for this, we up the minimal timeout to 100ms, which is still two orders
of magnitude less than the bogus minimum.
substream->wait_time was also misinterpreted as jiffies, despite being
documented as being in msecs. Only the soc/sof driver sets it - to 500,
which looks very much like msecs were intended.
Speaking of which, shouldn't snd_pcm_drain() also use substream->
wait_time?
As a drive-by, make the debug messages on timeout less confusing.
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230405201219.2197774-1-oswald.buddenhagen@gmx.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2023-04-05 22:12:19 +02:00
|
|
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|
|
|
|
|
|
2008-01-08 18:08:14 +01:00
|
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|
2011-09-15 08:49:25 +02:00
|
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|
2010-01-21 10:32:15 +01:00
|
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|
2008-01-08 18:08:14 +01:00
|
|
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|
|
2017-05-24 18:15:26 +02:00
|
|
|
|
|
|
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|
|
2023-08-15 21:01:13 +02:00
|
|
|
|
2017-05-24 17:59:17 +02:00
|
|
|
|
2017-05-24 18:15:26 +02:00
|
|
|
|
2023-08-15 21:01:13 +02:00
|
|
|
|
|
|
|
|
|
2017-05-24 18:15:26 +02:00
|
|
|
|
|
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|
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|
|
|
2005-04-16 15:20:36 -07:00
|
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|
|
2017-05-24 18:15:26 +02:00
|
|
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|
2023-08-15 21:01:13 +02:00
|
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|
|
2017-05-24 22:36:23 +02:00
|
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|
|
2023-08-15 21:01:13 +02:00
|
|
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|
2017-05-24 18:15:26 +02:00
|
|
|
|
2023-09-02 08:10:43 +02:00
|
|
|
|
|
|
|
|
|
2017-05-24 18:15:26 +02:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
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|
2017-05-24 18:15:26 +02:00
|
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|
2023-08-15 21:01:13 +02:00
|
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|
|
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|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2005-11-17 13:59:38 +01:00
|
|
|
|
2017-05-24 17:59:17 +02:00
|
|
|
|
2017-05-24 18:15:26 +02:00
|
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2023-08-15 21:01:13 +02:00
|
|
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|
2017-05-24 22:36:23 +02:00
|
|
|
|
|
|
|
|
|
2023-08-15 21:01:13 +02:00
|
|
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|
2017-05-24 22:36:23 +02:00
|
|
|
|
2023-09-02 08:10:43 +02:00
|
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2017-05-24 22:36:23 +02:00
|
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2023-08-15 21:01:13 +02:00
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2017-05-24 18:23:20 +02:00
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2017-05-24 18:15:26 +02:00
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2023-08-15 21:01:13 +02:00
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2017-05-24 18:15:26 +02:00
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2023-08-15 21:01:13 +02:00
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2026-05-17 18:51:20 +02:00
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2023-08-15 21:01:13 +02:00
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2017-05-24 18:15:26 +02:00
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2023-08-15 21:01:13 +02:00
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2017-05-24 18:15:26 +02:00
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2023-08-15 21:01:13 +02:00
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2017-05-24 18:15:26 +02:00
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2005-04-16 15:20:36 -07:00
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2017-05-24 18:18:15 +02:00
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2005-04-16 15:20:36 -07:00
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2017-05-24 18:18:15 +02:00
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2023-08-15 21:01:13 +02:00
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2017-05-24 18:18:15 +02:00
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2023-08-15 21:01:13 +02:00
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2005-04-16 15:20:36 -07:00
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2008-08-08 17:09:09 +02:00
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2023-08-15 21:01:36 +02:00
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2008-08-08 17:09:09 +02:00
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2022-09-26 15:55:48 +02:00
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2008-08-08 17:09:09 +02:00
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2017-05-24 17:51:30 +02:00
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2005-04-16 15:20:36 -07:00
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2022-09-26 15:55:48 +02:00
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2017-05-24 17:51:30 +02:00
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2005-04-16 15:20:36 -07:00
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2017-06-12 09:41:44 +09:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2017-06-12 09:41:44 +09:00
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2021-11-19 17:08:50 -06:00
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2017-06-12 09:41:44 +09:00
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2017-06-13 15:57:28 +02:00
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2021-11-19 17:08:49 -06:00
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2021-11-19 17:08:50 -06:00
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2021-11-19 17:08:49 -06:00
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2017-06-12 09:41:44 +09:00
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ALSA: usb-audio: Fix recursive locking at XRUN during syncing
The recent support of low latency playback in USB-audio driver made
the snd_usb_queue_pending_output_urbs() function to be called via PCM
ack ops. In the new code path, the function is performed already in
the PCM stream lock. The problem is that, when an XRUN is detected,
the function calls snd_pcm_xrun() to notify, but snd_pcm_xrun() is
supposed to be called only outside the stream lock. As a result, it
leads to a deadlock of PCM stream locking.
For avoiding such a recursive locking, this patch adds an additional
check to the code paths in PCM core that call the ack callback; now it
checks the error code from the callback, and if it's -EPIPE, the XRUN
is handled in the PCM core side gracefully. Along with it, the
USB-audio driver code is changed to follow that, i.e. -EPIPE is
returned instead of the explicit snd_pcm_xrun() call when the function
is performed already in the stream lock.
Fixes: d5f871f89e21 ("ALSA: usb-audio: Improved lowlatency playback support")
Reported-and-tested-by: John Keeping <john@metanate.com>
Link: https://lore.kernel.org/r/20230317195128.3911155-1-john@metanate.com
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Reviewed-by; Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20230320142838.494-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2023-03-20 15:28:38 +01:00
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2017-06-12 09:41:44 +09:00
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2005-04-16 15:20:36 -07:00
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ALSA: pcm: add 'applptr' event of tracepoint
In design of ALSA PCM core, status and control data for runtime of ALSA
PCM substream are shared between kernel/user spaces by page frame
mapping with read-only attribute. Both of hardware-side and
application-side position on PCM buffer are maintained as a part of
the status data. In a view of ALSA PCM application, these two positions
can be updated by executing ioctl(2) with some commands.
There's an event of tracepoint for hardware-side position; 'hwptr'.
On the other hand, no events for application-side position. This commit
adds a new event for this purpose; 'applptr'. When the application-side
position is changed in kernel space, this event is probed with useful
information for developers.
I note that the event is not probed for all of ALSA PCM applications, When
applications are written by read/write programming scenario, the event is
surely probed. The applications execute ioctl(2) with
SNDRV_PCM_IOCTL_[READ|WRITE][N/I]_FRAMES to read/write any PCM frame, then
ALSA PCM core updates the application-side position in kernel land.
However, when applications are written by mmap programming scenario, if
maintaining the application side position in kernel space accurately,
applications should voluntarily execute ioctl(2) with
SNDRV_PCM_IOCTL_SYNC_PTR to commit the number of handled PCM frames. If
not voluntarily, the application-side position is not changed, thus the
added event is not probed.
There's a loophole, using architectures to which ALSA PCM core judges
non cache coherent. In this case, the status and control data is not mapped
into processe's VMA for any applications. Userland library, alsa-lib, is
programmed for this case. It executes ioctl(2) with
SNDRV_PCM_IOCTL_SYNC_PTR command every time to requiring the status and
control data.
ARM is such an architecture. Below is an example with serial sound interface
(ssi) on i.mx6 quad core SoC. I use v4.1 kernel released by fsl-community
with patches from VIA Tech. Inc. for VAB820, and my backport patches for
relevant features for this patchset. I use Ubuntu 17.04 from
ports.ubuntu.com as user land for armhf architecture.
$ aplay -v -M -D hw:imx6vab820sgtl5,0 /dev/urandom -f S16_LE -r 48000 --period-size=128 --buffer-size=256
Playing raw data '/dev/urandom' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
Hardware PCM card 0 'imx6-vab820-sgtl5000' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 48000
exact rate : 48000 (48000/1)
msbits : 16
buffer_size : 256
period_size : 128
period_time : 2666
tstamp_mode : NONE
tstamp_type : MONOTONIC
period_step : 1
avail_min : 128
period_event : 0
start_threshold : 256
stop_threshold : 256
silence_threshold: 0
silence_size : 0
boundary : 1073741824
appl_ptr : 0
hw_ptr : 0
mmap_area[0] = 0x76f98000,0,16 (16)
$ trace-cmd record -e snd_pcm:hwptr -e snd_pcm:applptr
$ trace-cmd report
...
60.208495: applptr: pcmC0D0p/sub0: prev=1792, curr=1792, avail=0, period=128, buf=256
60.208633: applptr: pcmC0D0p/sub0: prev=1792, curr=1792, avail=0, period=128, buf=256
60.210022: hwptr: pcmC0D0p/sub0: IRQ: pos=128, old=1536, base=1536, period=128, buf=256
60.210202: applptr: pcmC0D0p/sub0: prev=1792, curr=1792, avail=128, period=128, buf=256
60.210344: hwptr: pcmC0D0p/sub0: POS: pos=128, old=1664, base=1536, period=128, buf=256
60.210348: applptr: pcmC0D0p/sub0: prev=1792, curr=1792, avail=128, period=128, buf=256
60.210486: applptr: pcmC0D0p/sub0: prev=1792, curr=1792, avail=128, period=128, buf=256
60.210626: applptr: pcmC0D0p/sub0: prev=1792, curr=1920, avail=0, period=128, buf=256
60.211002: applptr: pcmC0D0p/sub0: prev=1920, curr=1920, avail=0, period=128, buf=256
60.211142: hwptr: pcmC0D0p/sub0: POS: pos=128, old=1664, base=1536, period=128, buf=256
60.211146: applptr: pcmC0D0p/sub0: prev=1920, curr=1920, avail=0, period=128, buf=256
60.211287: applptr: pcmC0D0p/sub0: prev=1920, curr=1920, avail=0, period=128, buf=256
60.212690: hwptr: pcmC0D0p/sub0: IRQ: pos=0, old=1664, base=1536, period=128, buf=256
60.212866: applptr: pcmC0D0p/sub0: prev=1920, curr=1920, avail=128, period=128, buf=256
60.212999: hwptr: pcmC0D0p/sub0: POS: pos=0, old=1792, base=1792, period=128, buf=256
60.213003: applptr: pcmC0D0p/sub0: prev=1920, curr=1920, avail=128, period=128, buf=256
60.213135: applptr: pcmC0D0p/sub0: prev=1920, curr=1920, avail=128, period=128, buf=256
60.213276: applptr: pcmC0D0p/sub0: prev=1920, curr=2048, avail=0, period=128, buf=256
60.213654: applptr: pcmC0D0p/sub0: prev=2048, curr=2048, avail=0, period=128, buf=256
60.213796: hwptr: pcmC0D0p/sub0: POS: pos=0, old=1792, base=1792, period=128, buf=256
60.213800: applptr: pcmC0D0p/sub0: prev=2048, curr=2048, avail=0, period=128, buf=256
60.213937: applptr: pcmC0D0p/sub0: prev=2048, curr=2048, avail=0, period=128, buf=256
60.215356: hwptr: pcmC0D0p/sub0: IRQ: pos=128, old=1792, base=1792, period=128, buf=256
60.215542: applptr: pcmC0D0p/sub0: prev=2048, curr=2048, avail=128, period=128, buf=256
60.215679: hwptr: pcmC0D0p/sub0: POS: pos=128, old=1920, base=1792, period=128, buf=256
60.215683: applptr: pcmC0D0p/sub0: prev=2048, curr=2048, avail=128, period=128, buf=256
60.215813: applptr: pcmC0D0p/sub0: prev=2048, curr=2048, avail=128, period=128, buf=256
60.215947: applptr: pcmC0D0p/sub0: prev=2048, curr=2176, avail=0, period=128, buf=256
...
We can surely see 'applptr' event is probed even if the application run
for mmap programming scenario ('-M' option and 'hw' plugin). Below is a
result of strace:
02:44:15.886382 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.887203 poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL}], 1, -1) = 1 ([{fd=4, revents=POLLOUT}])
02:44:15.887471 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.887637 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.887805 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.887969 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.888132 read(3, "..."..., 256) = 256
02:44:15.889040 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.889221 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.889431 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.889606 poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL}], 1, -1) = 1 ([{fd=4, revents=POLLOUT}])
02:44:15.889833 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.889998 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.890164 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.891048 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.891228 read(3, "..."..., 256) = 256
02:44:15.891497 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.891661 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.891829 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
02:44:15.891991 poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL}], 1, -1) = 1 ([{fd=4, revents=POLLOUT}])
02:44:15.893007 ioctl(4, SNDRV_PCM_IOCTL_SYNC_PTR, 0x56a32b30) = 0
We can see 7 calls of ioctl(2) with SNDRV_PCM_IOCTL_SYNC_PTR per loop with
call of poll(2). 128 PCM frames are transferred per loop of one poll(2),
because the PCM substream is configured with S16_LE format and 1 channel
(2 byte * 1 * 128 = 256 bytes). This equals to the size of period of PCM
buffer. Comparing to the probed data, one of the 7 calls of ioctl(2) is
actually used to commit the number of copied PCM frames to kernel space.
The other calls are just used to check runtime status of PCM substream;
e.g. XRUN.
The tracepoint event is useful to investigate this case. I note that below
modules are related to the above sample.
* snd-soc-dummy.ko
* snd-soc-imx-sgtl5000.ko
* snd-soc-fsl-ssi.ko
* snd-soc-imx-pcm-dma.ko
* snd-soc-sgtl5000.ko
My additional note is lock acquisition. The event is probed under acquiring
PCM stream lock. This means that calculation in the event is free from
any hardware events.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-06-12 09:41:45 +09:00
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2005-04-16 15:20:36 -07:00
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2017-05-24 22:36:23 +02:00
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2017-05-24 18:23:20 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 13:59:38 +01:00
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2005-04-16 15:20:36 -07:00
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2012-05-11 17:50:49 +02:00
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2017-05-24 18:15:26 +02:00
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2017-05-21 09:35:21 +02:00
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2017-05-24 22:36:23 +02:00
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2017-05-21 09:35:21 +02:00
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2017-05-24 22:36:23 +02:00
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2017-05-21 09:35:21 +02:00
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2017-05-24 18:15:26 +02:00
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2017-05-21 09:35:21 +02:00
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2017-05-24 18:15:26 +02:00
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2017-05-24 22:36:23 +02:00
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2017-05-24 18:15:26 +02:00
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2023-08-15 21:01:13 +02:00
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2017-05-24 18:15:26 +02:00
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2017-05-24 22:36:23 +02:00
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2017-05-21 09:35:21 +02:00
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2005-04-16 15:20:36 -07:00
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2017-05-21 09:35:21 +02:00
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2005-04-16 15:20:36 -07:00
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2017-05-24 17:51:30 +02:00
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2005-04-16 15:20:36 -07:00
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2018-09-07 16:58:54 -03:00
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2022-09-26 15:55:48 +02:00
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2018-09-07 16:58:54 -03:00
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2019-02-13 00:57:51 -02:00
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2017-05-24 22:36:23 +02:00
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2022-09-26 15:55:48 +02:00
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2019-02-06 07:30:44 +01:00
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2017-05-24 22:36:23 +02:00
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2005-04-16 15:20:36 -07:00
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2018-04-11 17:56:52 +02:00
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2018-09-07 16:58:54 -03:00
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2005-04-16 15:20:36 -07:00
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2008-01-08 18:08:14 +01:00
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2017-05-24 22:36:23 +02:00
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2022-09-26 15:55:48 +02:00
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2008-01-08 18:08:14 +01:00
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2005-04-16 15:20:36 -07:00
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2010-06-27 00:13:20 +02:00
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2008-01-08 18:08:14 +01:00
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2005-04-16 15:20:36 -07:00
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2008-01-08 18:08:14 +01:00
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2005-04-16 15:20:36 -07:00
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2017-06-16 22:29:55 +02:00
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2005-04-16 15:20:36 -07:00
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2008-08-08 17:09:09 +02:00
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2019-01-25 17:31:59 +01:00
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2008-08-08 17:09:09 +02:00
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ALSA: pcm: Fix potential AB/BA lock with buffer_mutex and mmap_lock
syzbot caught a potential deadlock between the PCM
runtime->buffer_mutex and the mm->mmap_lock. It was brought by the
recent fix to cover the racy read/write and other ioctls, and in that
commit, I overlooked a (hopefully only) corner case that may take the
revert lock, namely, the OSS mmap. The OSS mmap operation
exceptionally allows to re-configure the parameters inside the OSS
mmap syscall, where mm->mmap_mutex is already held. Meanwhile, the
copy_from/to_user calls at read/write operations also take the
mm->mmap_lock internally, hence it may lead to a AB/BA deadlock.
A similar problem was already seen in the past and we fixed it with a
refcount (in commit b248371628aa). The former fix covered only the
call paths with OSS read/write and OSS ioctls, while we need to cover
the concurrent access via both ALSA and OSS APIs now.
This patch addresses the problem above by replacing the buffer_mutex
lock in the read/write operations with a refcount similar as we've
used for OSS. The new field, runtime->buffer_accessing, keeps the
number of concurrent read/write operations. Unlike the former
buffer_mutex protection, this protects only around the
copy_from/to_user() calls; the other codes are basically protected by
the PCM stream lock. The refcount can be a negative, meaning blocked
by the ioctls. If a negative value is seen, the read/write aborts
with -EBUSY. In the ioctl side, OTOH, they check this refcount, too,
and set to a negative value for blocking unless it's already being
accessed.
Reported-by: syzbot+6e5c88838328e99c7e1c@syzkaller.appspotmail.com
Fixes: dca947d4d26d ("ALSA: pcm: Fix races among concurrent read/write and buffer changes")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/000000000000381a0d05db622a81@google.com
Link: https://lore.kernel.org/r/20220330120903.4738-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2022-03-30 14:09:03 +02:00
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2005-04-16 15:20:36 -07:00
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ALSA: memalloc: Support for non-contiguous page allocation
This patch adds the support for allocation of non-contiguous DMA pages
in the common memalloc helper. It's another SG-buffer type, but
unlike the existing one, this is directional and requires the explicit
sync / invalidation of dirty pages on non-coherent architectures.
For this enhancement, the following points are changed:
- snd_dma_device stores the DMA direction.
- snd_dma_device stores need_sync flag indicating whether the explicit
sync is required or not.
- A new variant of helper functions, snd_dma_alloc_dir_pages() and
*_all() are introduced; the old snd_dma_alloc_pages() and *_all()
kept as just wrappers with DMA_BIDIRECTIONAL.
- A new helper snd_dma_buffer_sync() is introduced; this gets called
in the appropriate places.
- A new allocation type, SNDRV_DMA_TYPE_NONCONTIG, is introduced.
When the driver allocates pages with this new type, and it may require
the SNDRV_PCM_INFO_EXPLICIT_SYNC flag set to the PCM hardware.info for
taking the full control of PCM applptr and hwptr changes (that implies
disabling the mmap of control/status data). When the buffer
allocation is managed by snd_pcm_set_managed_buffer(), this flag is
automatically set depending on the result of dma_need_sync()
internally. Otherwise, if the buffer is managed manually, the driver
has to set the flag explicitly, too.
The explicit sync between CPU and device for non-coherent memory is
performed at the points before and after read/write transfer as well
as the applptr/hwptr syncptr ioctl. In the case of mmap mode,
user-space is supposed to call the syncptr ioctl with the hwptr flag
to update and fetch the status at first; this corresponds to CPU-sync.
Then user-space advances the applptr via syncptr ioctl again with
applptr flag, and this corresponds to the device sync with flushing.
Other than the DMA direction and the explicit sync, the usage of this
new buffer type is almost equivalent with the existing
SNDRV_DMA_TYPE_DEV_SG; you can get the page and the address via
snd_sgbuf_get_page() and snd_sgbuf_get_addr(), also calculate the
continuous pages via snd_sgbuf_get_chunk_size().
For those SG-page handling, the non-contig type shares the same ops
with the vmalloc handler. As we do always vmap the SG pages at first,
the actual address can be deduced from the vmapped address easily
without iterating the SG-list.
Link: https://lore.kernel.org/r/20211017074859.24112-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-10-17 09:48:57 +02:00
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2017-05-24 18:15:26 +02:00
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2023-08-15 21:01:13 +02:00
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ALSA: memalloc: Support for non-contiguous page allocation
This patch adds the support for allocation of non-contiguous DMA pages
in the common memalloc helper. It's another SG-buffer type, but
unlike the existing one, this is directional and requires the explicit
sync / invalidation of dirty pages on non-coherent architectures.
For this enhancement, the following points are changed:
- snd_dma_device stores the DMA direction.
- snd_dma_device stores need_sync flag indicating whether the explicit
sync is required or not.
- A new variant of helper functions, snd_dma_alloc_dir_pages() and
*_all() are introduced; the old snd_dma_alloc_pages() and *_all()
kept as just wrappers with DMA_BIDIRECTIONAL.
- A new helper snd_dma_buffer_sync() is introduced; this gets called
in the appropriate places.
- A new allocation type, SNDRV_DMA_TYPE_NONCONTIG, is introduced.
When the driver allocates pages with this new type, and it may require
the SNDRV_PCM_INFO_EXPLICIT_SYNC flag set to the PCM hardware.info for
taking the full control of PCM applptr and hwptr changes (that implies
disabling the mmap of control/status data). When the buffer
allocation is managed by snd_pcm_set_managed_buffer(), this flag is
automatically set depending on the result of dma_need_sync()
internally. Otherwise, if the buffer is managed manually, the driver
has to set the flag explicitly, too.
The explicit sync between CPU and device for non-coherent memory is
performed at the points before and after read/write transfer as well
as the applptr/hwptr syncptr ioctl. In the case of mmap mode,
user-space is supposed to call the syncptr ioctl with the hwptr flag
to update and fetch the status at first; this corresponds to CPU-sync.
Then user-space advances the applptr via syncptr ioctl again with
applptr flag, and this corresponds to the device sync with flushing.
Other than the DMA direction and the explicit sync, the usage of this
new buffer type is almost equivalent with the existing
SNDRV_DMA_TYPE_DEV_SG; you can get the page and the address via
snd_sgbuf_get_page() and snd_sgbuf_get_addr(), also calculate the
continuous pages via snd_sgbuf_get_chunk_size().
For those SG-page handling, the non-contig type shares the same ops
with the vmalloc handler. As we do always vmap the SG pages at first,
the actual address can be deduced from the vmapped address easily
without iterating the SG-list.
Link: https://lore.kernel.org/r/20211017074859.24112-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-10-17 09:48:57 +02:00
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2005-04-16 15:20:36 -07:00
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ALSA: pcm: Fix potential AB/BA lock with buffer_mutex and mmap_lock
syzbot caught a potential deadlock between the PCM
runtime->buffer_mutex and the mm->mmap_lock. It was brought by the
recent fix to cover the racy read/write and other ioctls, and in that
commit, I overlooked a (hopefully only) corner case that may take the
revert lock, namely, the OSS mmap. The OSS mmap operation
exceptionally allows to re-configure the parameters inside the OSS
mmap syscall, where mm->mmap_mutex is already held. Meanwhile, the
copy_from/to_user calls at read/write operations also take the
mm->mmap_lock internally, hence it may lead to a AB/BA deadlock.
A similar problem was already seen in the past and we fixed it with a
refcount (in commit b248371628aa). The former fix covered only the
call paths with OSS read/write and OSS ioctls, while we need to cover
the concurrent access via both ALSA and OSS APIs now.
This patch addresses the problem above by replacing the buffer_mutex
lock in the read/write operations with a refcount similar as we've
used for OSS. The new field, runtime->buffer_accessing, keeps the
number of concurrent read/write operations. Unlike the former
buffer_mutex protection, this protects only around the
copy_from/to_user() calls; the other codes are basically protected by
the PCM stream lock. The refcount can be a negative, meaning blocked
by the ioctls. If a negative value is seen, the read/write aborts
with -EBUSY. In the ioctl side, OTOH, they check this refcount, too,
and set to a negative value for blocking unless it's already being
accessed.
Reported-by: syzbot+6e5c88838328e99c7e1c@syzkaller.appspotmail.com
Fixes: dca947d4d26d ("ALSA: pcm: Fix races among concurrent read/write and buffer changes")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/000000000000381a0d05db622a81@google.com
Link: https://lore.kernel.org/r/20220330120903.4738-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2022-03-30 14:09:03 +02:00
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2010-01-07 15:36:31 +01:00
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2017-05-24 17:51:30 +02:00
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2005-04-16 15:20:36 -07:00
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2017-06-12 09:41:44 +09:00
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2005-04-16 15:20:36 -07:00
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2012-05-11 17:50:49 +02:00
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2017-05-24 22:36:23 +02:00
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2022-09-26 15:55:48 +02:00
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2005-04-16 15:20:36 -07:00
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2010-01-21 10:32:15 +01:00
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2010-01-07 15:36:31 +01:00
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2005-04-16 15:20:36 -07:00
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2017-05-24 22:36:23 +02:00
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2012-07-27 18:27:00 +02:00
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2012-09-13 14:48:46 +02:00
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2012-07-27 18:27:00 +02:00
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2012-09-13 14:48:46 +02:00
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2012-07-27 18:27:00 +02:00
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2017-06-14 16:20:32 +02:00
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2012-07-27 18:27:00 +02:00
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ALSA: control: Add verification for kctl accesses
The current implementation of ALSA control API fully relies on the
callbacks of each driver, and there is no verification of the values
passed via API. This patch is an attempt to improve the situation
slightly by adding the validation code for the values stored via info
and get callbacks.
The patch adds a new kconfig, CONFIG_SND_CTL_VALIDATION. It depends
on CONFIG_SND_DEBUG and off as default since the validation would
require a slight overhead including the additional call of info
callback at each get callback invocation.
When this config is enabled, the values stored by each info callback
invocation are verified, namely:
- Whether the info type is valid
- Whether the number of enum items is non-zero
- Whether the given info count is within the allowed boundary
Similarly, the values stored at each get callback are verified as
well:
- Whether the values are within the given range
- Whether the values are aligned with the given step
- Whether any further changes are seen in the data array over the
given info count
The last point helps identifying a possibly invalid data type access,
typically a case where the info callback declares the type being
SNDRV_CTL_ELEM_TYPE_ENUMERATED while the get/put callbacks store
the values in value.integer.value[] array.
When a validation fails, the ALSA core logs an error message including
the device and the control ID, and the API call also returns an
error. So, with the new validation turned on, the driver behavior
difference may be visible on user-space, too -- it's intentional,
though, so that we can catch an error more clearly.
The patch also introduces a new ctl access type,
SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK. A driver may pass this flag with
other access bits to indicate that the ctl element won't be verified.
It's useful when a driver code is specially written to access the data
greater than info->count size by some reason. For example, this flag
is actually set now in HD-audio HDMI codec driver which needs to clear
the data array in the case of the disconnected monitor.
Also, the PCM channel-map helper code is slightly modified to avoid
the false-positive hit by this validation code, too.
Link: https://lore.kernel.org/r/20200104083556.27789-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2020-01-04 09:35:56 +01:00
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2012-07-27 18:27:00 +02:00
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2017-06-14 16:20:32 +02:00
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2012-07-27 18:27:00 +02:00
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2013-03-11 22:05:14 +01:00
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2012-07-27 18:27:00 +02:00
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2024-06-16 09:34:46 +02:00
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2012-07-27 18:27:00 +02:00
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2016-05-10 16:07:40 +02:00
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2026-02-21 16:37:42 -08:00
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2012-07-27 18:27:00 +02:00
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