2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2010-05-27 13:40:25 -06:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2010-05-27 13:40:25 -06:00
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2005-04-16 15:20:36 -07:00
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2008-03-17 10:24:24 +10:00
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2005-04-16 15:20:36 -07:00
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2006-02-02 19:37:46 +11:00
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 17:04:11 +09:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2012-10-02 18:01:03 +01:00
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2005-04-16 15:20:36 -07:00
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2007-07-17 10:46:52 +10:00
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2005-04-16 15:20:36 -07:00
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2011-05-26 13:46:22 -04:00
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2007-09-03 12:06:45 +10:00
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2012-10-28 18:28:06 +01:00
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2012-11-14 11:22:52 +01:00
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2012-10-02 18:01:25 +01:00
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2005-04-16 15:20:36 -07:00
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drm: add separate drm debugging levels
Now all the DRM debug info will be reported if the boot option of
"drm.debug=1" is added. Sometimes it is inconvenient to get the debug
info in KMS mode. We will get too much unrelated info.
This will separate several DRM debug levels and the debug level can be used
to print the different debug info. And the debug level is controlled by the
module parameter of drm.debug
In this patch it is divided into four debug levels;
drm_core, drm_driver, drm_kms, drm_mode.
At the same time we can get the different debug info by changing the debug
level. This can be done by adding the module parameter. Of course it can
be changed through the /sys/module/drm/parameters/debug after the system is
booted.
Four debug macro definitions are provided.
DRM_DEBUG(fmt, args...)
DRM_DEBUG_DRIVER(prefix, fmt, args...)
DRM_DEBUG_KMS(prefix, fmt, args...)
DRM_DEBUG_MODE(prefix, fmt, args...)
When the boot option of "drm.debug=4" is added, it will print the debug info
using DRM_DEBUG_KMS macro definition.
When the boot option of "drm.debug=6" is added, it will print the debug info
using DRM_DEBUG_KMS/DRM_DEBUG_DRIVER.
Sometimes we expect to print the value of an array.
For example: SDVO command,
In such case the following four DRM debug macro definitions are added:
DRM_LOG(fmt, args...)
DRM_LOG_DRIVER(fmt, args...)
DRM_LOG_KMS(fmt, args...)
DRM_LOG_MODE(fmt, args...)
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-06-02 14:09:47 +08:00
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2011-11-25 15:21:02 +00:00
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2009-07-20 13:48:06 +08:00
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2011-03-30 22:57:33 -03:00
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2009-07-20 13:48:06 +08:00
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drm: add separate drm debugging levels
Now all the DRM debug info will be reported if the boot option of
"drm.debug=1" is added. Sometimes it is inconvenient to get the debug
info in KMS mode. We will get too much unrelated info.
This will separate several DRM debug levels and the debug level can be used
to print the different debug info. And the debug level is controlled by the
module parameter of drm.debug
In this patch it is divided into four debug levels;
drm_core, drm_driver, drm_kms, drm_mode.
At the same time we can get the different debug info by changing the debug
level. This can be done by adding the module parameter. Of course it can
be changed through the /sys/module/drm/parameters/debug after the system is
booted.
Four debug macro definitions are provided.
DRM_DEBUG(fmt, args...)
DRM_DEBUG_DRIVER(prefix, fmt, args...)
DRM_DEBUG_KMS(prefix, fmt, args...)
DRM_DEBUG_MODE(prefix, fmt, args...)
When the boot option of "drm.debug=4" is added, it will print the debug info
using DRM_DEBUG_KMS macro definition.
When the boot option of "drm.debug=6" is added, it will print the debug info
using DRM_DEBUG_KMS/DRM_DEBUG_DRIVER.
Sometimes we expect to print the value of an array.
For example: SDVO command,
In such case the following four DRM debug macro definitions are added:
DRM_LOG(fmt, args...)
DRM_LOG_DRIVER(fmt, args...)
DRM_LOG_KMS(fmt, args...)
DRM_LOG_MODE(fmt, args...)
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-06-02 14:09:47 +08:00
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2011-10-31 17:11:33 -07:00
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2011-04-17 20:35:52 -07:00
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2011-10-31 17:11:33 -07:00
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2011-04-17 20:35:51 -07:00
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2005-04-16 15:20:36 -07:00
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2008-05-07 12:15:39 +10:00
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2005-04-16 15:20:36 -07:00
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2005-07-10 14:46:12 +10:00
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2008-05-07 12:15:39 +10:00
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2008-07-30 12:06:12 -07:00
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2008-11-07 14:05:41 -08:00
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2011-11-25 15:21:02 +00:00
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2010-12-15 03:16:38 +10:00
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2005-04-16 15:20:36 -07:00
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2006-08-07 22:22:10 +10:00
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2005-04-16 15:20:36 -07:00
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2006-08-07 22:36:47 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2011-04-17 20:35:51 -07:00
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2005-04-16 15:20:36 -07:00
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2011-04-17 20:35:51 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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drm: add separate drm debugging levels
Now all the DRM debug info will be reported if the boot option of
"drm.debug=1" is added. Sometimes it is inconvenient to get the debug
info in KMS mode. We will get too much unrelated info.
This will separate several DRM debug levels and the debug level can be used
to print the different debug info. And the debug level is controlled by the
module parameter of drm.debug
In this patch it is divided into four debug levels;
drm_core, drm_driver, drm_kms, drm_mode.
At the same time we can get the different debug info by changing the debug
level. This can be done by adding the module parameter. Of course it can
be changed through the /sys/module/drm/parameters/debug after the system is
booted.
Four debug macro definitions are provided.
DRM_DEBUG(fmt, args...)
DRM_DEBUG_DRIVER(prefix, fmt, args...)
DRM_DEBUG_KMS(prefix, fmt, args...)
DRM_DEBUG_MODE(prefix, fmt, args...)
When the boot option of "drm.debug=4" is added, it will print the debug info
using DRM_DEBUG_KMS macro definition.
When the boot option of "drm.debug=6" is added, it will print the debug info
using DRM_DEBUG_KMS/DRM_DEBUG_DRIVER.
Sometimes we expect to print the value of an array.
For example: SDVO command,
In such case the following four DRM debug macro definitions are added:
DRM_LOG(fmt, args...)
DRM_LOG_DRIVER(fmt, args...)
DRM_LOG_KMS(fmt, args...)
DRM_LOG_MODE(fmt, args...)
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-06-02 14:09:47 +08:00
|
|
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|
2005-04-16 15:20:36 -07:00
|
|
|
|
drm: add separate drm debugging levels
Now all the DRM debug info will be reported if the boot option of
"drm.debug=1" is added. Sometimes it is inconvenient to get the debug
info in KMS mode. We will get too much unrelated info.
This will separate several DRM debug levels and the debug level can be used
to print the different debug info. And the debug level is controlled by the
module parameter of drm.debug
In this patch it is divided into four debug levels;
drm_core, drm_driver, drm_kms, drm_mode.
At the same time we can get the different debug info by changing the debug
level. This can be done by adding the module parameter. Of course it can
be changed through the /sys/module/drm/parameters/debug after the system is
booted.
Four debug macro definitions are provided.
DRM_DEBUG(fmt, args...)
DRM_DEBUG_DRIVER(prefix, fmt, args...)
DRM_DEBUG_KMS(prefix, fmt, args...)
DRM_DEBUG_MODE(prefix, fmt, args...)
When the boot option of "drm.debug=4" is added, it will print the debug info
using DRM_DEBUG_KMS macro definition.
When the boot option of "drm.debug=6" is added, it will print the debug info
using DRM_DEBUG_KMS/DRM_DEBUG_DRIVER.
Sometimes we expect to print the value of an array.
For example: SDVO command,
In such case the following four DRM debug macro definitions are added:
DRM_LOG(fmt, args...)
DRM_LOG_DRIVER(fmt, args...)
DRM_LOG_KMS(fmt, args...)
DRM_LOG_MODE(fmt, args...)
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-06-02 14:09:47 +08:00
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2009-07-20 13:48:04 +08:00
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|
drm: add separate drm debugging levels
Now all the DRM debug info will be reported if the boot option of
"drm.debug=1" is added. Sometimes it is inconvenient to get the debug
info in KMS mode. We will get too much unrelated info.
This will separate several DRM debug levels and the debug level can be used
to print the different debug info. And the debug level is controlled by the
module parameter of drm.debug
In this patch it is divided into four debug levels;
drm_core, drm_driver, drm_kms, drm_mode.
At the same time we can get the different debug info by changing the debug
level. This can be done by adding the module parameter. Of course it can
be changed through the /sys/module/drm/parameters/debug after the system is
booted.
Four debug macro definitions are provided.
DRM_DEBUG(fmt, args...)
DRM_DEBUG_DRIVER(prefix, fmt, args...)
DRM_DEBUG_KMS(prefix, fmt, args...)
DRM_DEBUG_MODE(prefix, fmt, args...)
When the boot option of "drm.debug=4" is added, it will print the debug info
using DRM_DEBUG_KMS macro definition.
When the boot option of "drm.debug=6" is added, it will print the debug info
using DRM_DEBUG_KMS/DRM_DEBUG_DRIVER.
Sometimes we expect to print the value of an array.
For example: SDVO command,
In such case the following four DRM debug macro definitions are added:
DRM_LOG(fmt, args...)
DRM_LOG_DRIVER(fmt, args...)
DRM_LOG_KMS(fmt, args...)
DRM_LOG_MODE(fmt, args...)
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-06-02 14:09:47 +08:00
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|
2009-07-20 13:48:04 +08:00
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|
|
drm: add separate drm debugging levels
Now all the DRM debug info will be reported if the boot option of
"drm.debug=1" is added. Sometimes it is inconvenient to get the debug
info in KMS mode. We will get too much unrelated info.
This will separate several DRM debug levels and the debug level can be used
to print the different debug info. And the debug level is controlled by the
module parameter of drm.debug
In this patch it is divided into four debug levels;
drm_core, drm_driver, drm_kms, drm_mode.
At the same time we can get the different debug info by changing the debug
level. This can be done by adding the module parameter. Of course it can
be changed through the /sys/module/drm/parameters/debug after the system is
booted.
Four debug macro definitions are provided.
DRM_DEBUG(fmt, args...)
DRM_DEBUG_DRIVER(prefix, fmt, args...)
DRM_DEBUG_KMS(prefix, fmt, args...)
DRM_DEBUG_MODE(prefix, fmt, args...)
When the boot option of "drm.debug=4" is added, it will print the debug info
using DRM_DEBUG_KMS macro definition.
When the boot option of "drm.debug=6" is added, it will print the debug info
using DRM_DEBUG_KMS/DRM_DEBUG_DRIVER.
Sometimes we expect to print the value of an array.
For example: SDVO command,
In such case the following four DRM debug macro definitions are added:
DRM_LOG(fmt, args...)
DRM_LOG_DRIVER(fmt, args...)
DRM_LOG_KMS(fmt, args...)
DRM_LOG_MODE(fmt, args...)
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-06-02 14:09:47 +08:00
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2009-07-20 13:48:04 +08:00
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|
drm: add separate drm debugging levels
Now all the DRM debug info will be reported if the boot option of
"drm.debug=1" is added. Sometimes it is inconvenient to get the debug
info in KMS mode. We will get too much unrelated info.
This will separate several DRM debug levels and the debug level can be used
to print the different debug info. And the debug level is controlled by the
module parameter of drm.debug
In this patch it is divided into four debug levels;
drm_core, drm_driver, drm_kms, drm_mode.
At the same time we can get the different debug info by changing the debug
level. This can be done by adding the module parameter. Of course it can
be changed through the /sys/module/drm/parameters/debug after the system is
booted.
Four debug macro definitions are provided.
DRM_DEBUG(fmt, args...)
DRM_DEBUG_DRIVER(prefix, fmt, args...)
DRM_DEBUG_KMS(prefix, fmt, args...)
DRM_DEBUG_MODE(prefix, fmt, args...)
When the boot option of "drm.debug=4" is added, it will print the debug info
using DRM_DEBUG_KMS macro definition.
When the boot option of "drm.debug=6" is added, it will print the debug info
using DRM_DEBUG_KMS/DRM_DEBUG_DRIVER.
Sometimes we expect to print the value of an array.
For example: SDVO command,
In such case the following four DRM debug macro definitions are added:
DRM_LOG(fmt, args...)
DRM_LOG_DRIVER(fmt, args...)
DRM_LOG_KMS(fmt, args...)
DRM_LOG_MODE(fmt, args...)
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-06-02 14:09:47 +08:00
|
|
|
|
2009-07-20 13:48:04 +08:00
|
|
|
|
drm: add separate drm debugging levels
Now all the DRM debug info will be reported if the boot option of
"drm.debug=1" is added. Sometimes it is inconvenient to get the debug
info in KMS mode. We will get too much unrelated info.
This will separate several DRM debug levels and the debug level can be used
to print the different debug info. And the debug level is controlled by the
module parameter of drm.debug
In this patch it is divided into four debug levels;
drm_core, drm_driver, drm_kms, drm_mode.
At the same time we can get the different debug info by changing the debug
level. This can be done by adding the module parameter. Of course it can
be changed through the /sys/module/drm/parameters/debug after the system is
booted.
Four debug macro definitions are provided.
DRM_DEBUG(fmt, args...)
DRM_DEBUG_DRIVER(prefix, fmt, args...)
DRM_DEBUG_KMS(prefix, fmt, args...)
DRM_DEBUG_MODE(prefix, fmt, args...)
When the boot option of "drm.debug=4" is added, it will print the debug info
using DRM_DEBUG_KMS macro definition.
When the boot option of "drm.debug=6" is added, it will print the debug info
using DRM_DEBUG_KMS/DRM_DEBUG_DRIVER.
Sometimes we expect to print the value of an array.
For example: SDVO command,
In such case the following four DRM debug macro definitions are added:
DRM_LOG(fmt, args...)
DRM_LOG_DRIVER(fmt, args...)
DRM_LOG_KMS(fmt, args...)
DRM_LOG_MODE(fmt, args...)
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-06-02 14:09:47 +08:00
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2011-11-25 15:21:02 +00:00
|
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|
drm: add separate drm debugging levels
Now all the DRM debug info will be reported if the boot option of
"drm.debug=1" is added. Sometimes it is inconvenient to get the debug
info in KMS mode. We will get too much unrelated info.
This will separate several DRM debug levels and the debug level can be used
to print the different debug info. And the debug level is controlled by the
module parameter of drm.debug
In this patch it is divided into four debug levels;
drm_core, drm_driver, drm_kms, drm_mode.
At the same time we can get the different debug info by changing the debug
level. This can be done by adding the module parameter. Of course it can
be changed through the /sys/module/drm/parameters/debug after the system is
booted.
Four debug macro definitions are provided.
DRM_DEBUG(fmt, args...)
DRM_DEBUG_DRIVER(prefix, fmt, args...)
DRM_DEBUG_KMS(prefix, fmt, args...)
DRM_DEBUG_MODE(prefix, fmt, args...)
When the boot option of "drm.debug=4" is added, it will print the debug info
using DRM_DEBUG_KMS macro definition.
When the boot option of "drm.debug=6" is added, it will print the debug info
using DRM_DEBUG_KMS/DRM_DEBUG_DRIVER.
Sometimes we expect to print the value of an array.
For example: SDVO command,
In such case the following four DRM debug macro definitions are added:
DRM_LOG(fmt, args...)
DRM_LOG_DRIVER(fmt, args...)
DRM_LOG_KMS(fmt, args...)
DRM_LOG_MODE(fmt, args...)
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-06-02 14:09:47 +08:00
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2005-04-16 15:20:36 -07:00
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2009-07-20 13:48:04 +08:00
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2011-11-25 15:21:02 +00:00
|
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2005-04-16 15:20:36 -07:00
|
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|
drm: add separate drm debugging levels
Now all the DRM debug info will be reported if the boot option of
"drm.debug=1" is added. Sometimes it is inconvenient to get the debug
info in KMS mode. We will get too much unrelated info.
This will separate several DRM debug levels and the debug level can be used
to print the different debug info. And the debug level is controlled by the
module parameter of drm.debug
In this patch it is divided into four debug levels;
drm_core, drm_driver, drm_kms, drm_mode.
At the same time we can get the different debug info by changing the debug
level. This can be done by adding the module parameter. Of course it can
be changed through the /sys/module/drm/parameters/debug after the system is
booted.
Four debug macro definitions are provided.
DRM_DEBUG(fmt, args...)
DRM_DEBUG_DRIVER(prefix, fmt, args...)
DRM_DEBUG_KMS(prefix, fmt, args...)
DRM_DEBUG_MODE(prefix, fmt, args...)
When the boot option of "drm.debug=4" is added, it will print the debug info
using DRM_DEBUG_KMS macro definition.
When the boot option of "drm.debug=6" is added, it will print the debug info
using DRM_DEBUG_KMS/DRM_DEBUG_DRIVER.
Sometimes we expect to print the value of an array.
For example: SDVO command,
In such case the following four DRM debug macro definitions are added:
DRM_LOG(fmt, args...)
DRM_LOG_DRIVER(fmt, args...)
DRM_LOG_KMS(fmt, args...)
DRM_LOG_MODE(fmt, args...)
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-06-02 14:09:47 +08:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 13:25:41 +10:00
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2005-04-16 15:20:36 -07:00
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2009-06-10 12:43:48 -07:00
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2007-09-03 12:06:45 +10:00
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2009-06-10 12:43:48 -07:00
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2005-04-16 15:20:36 -07:00
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2007-08-25 20:23:09 +10:00
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2005-04-16 15:20:36 -07:00
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2007-09-03 12:06:45 +10:00
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2005-04-16 15:20:36 -07:00
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drm: 32/64-bit DRM ioctl compatibility patch
The patch is against a 2.6.11 kernel tree. I am running this with a
32-bit X server (compiled up from X.org CVS as of a couple of weeks
ago) and 32-bit DRI libraries and clients. All the userland stuff is
identical to what I am using under a 32-bit kernel on my G4 powerbook
(which is a 32-bit machine of course). I haven't tried compiling up a
64-bit X server or clients yet.
In the compatibility routines I have assumed that the kernel can
safely access user addresses after set_fs(KERNEL_DS). That is, where
an ioctl argument structure contains pointers to other structures, and
those other structures are already compatible between the 32-bit and
64-bit ABIs (i.e. they only contain things like chars, shorts or
ints), I just check the address with access_ok() and then pass it
through to the 64-bit ioctl code. I believe this approach may not
work on sparc64, but it does work on ppc64 and x86_64 at least.
One tricky area which may need to be revisited is the question of how
to handle the handles which we pass back to userspace to identify
mappings. These handles are generated in the ADDMAP ioctl and then
passed in as the offset value to mmap. However, offset values for
mmap seem to be generated in other ways as well, particularly for AGP
mappings.
The approach I have ended up with is to generate a fake 32-bit handle
only for _DRM_SHM mappings. The handles for other mappings (AGP, REG,
FB) are physical addresses which are already limited to 32 bits, and
generating fake handles for them created all sorts of problems in the
mmap/nopage code.
This patch has been updated to use the new compatibility ioctls.
From: Paul Mackerras <paulus@samba.org>
Signed-off-by: Dave Airlie <airlied@linux.ie>
2005-06-23 21:29:18 +10:00
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2009-12-02 12:13:48 -05:00
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2006-01-02 13:54:04 +11:00
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2008-11-07 14:05:41 -08:00
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2009-12-16 22:17:09 +00:00
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2006-01-02 13:54:04 +11:00
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2007-09-03 12:06:45 +10:00
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2006-01-02 13:54:04 +11:00
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2009-03-18 17:26:44 +00:00
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2010-08-14 20:20:34 +10:00
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2007-09-03 12:06:45 +10:00
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2010-08-14 20:20:34 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:21:47 +10:00
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2006-08-07 22:22:10 +10:00
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2007-07-12 10:26:44 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 16:21:47 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:21:47 +10:00
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2007-05-26 05:01:51 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 16:21:47 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:17:42 +10:00
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2005-09-25 14:28:13 +10:00
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2007-08-25 20:23:09 +10:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 16:17:42 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:32:08 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 16:17:42 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 16:32:08 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:32:08 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 16:17:42 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 16:32:08 +10:00
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2005-04-16 15:20:36 -07:00
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2006-03-19 18:56:12 +11:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:32:08 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 16:17:42 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 16:32:08 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:32:08 +10:00
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2005-04-16 15:20:36 -07:00
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2009-09-12 04:33:34 +10:00
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2010-07-01 16:48:09 -07:00
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2009-09-12 04:33:34 +10:00
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2011-11-25 15:21:02 +00:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 15:53:27 +10:00
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2005-09-25 14:28:13 +10:00
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2012-02-07 16:47:26 -08:00
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2005-09-25 14:28:13 +10:00
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2007-05-26 05:01:51 +10:00
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2008-04-21 16:47:32 +10:00
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2005-09-25 14:28:13 +10:00
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2008-11-28 14:22:24 +10:00
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2008-07-30 12:06:12 -07:00
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2008-11-28 14:22:24 +10:00
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2007-08-25 20:23:09 +10:00
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2007-11-05 12:37:41 +10:00
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2008-11-28 14:22:24 +10:00
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drm: revamp locking around fb creation/destruction
Well, at least step 1. The goal here is that framebuffer objects can
survive outside of the mode_config lock, with just a reference held
as protection. The first step to get there is to introduce a special
fb_lock which protects fb lookup, creation and destruction, to make
them appear atomic.
This new fb_lock can nest within the mode_config lock. But the idea is
(once the reference counting part is completed) that we only quickly
take that fb_lock to lookup a framebuffer and grab a reference,
without any other locks involved.
vmwgfx is the only driver which does framebuffer lookups itself, also
wrap those calls to drm_mode_object_find with the new lock.
Also protect the fb_list walking in i915 and omapdrm with the new lock.
As a slight complication there's also the list of user-created fbs
attached to the file private. The problem now is that at fclose() time
we need to walk that list, eventually do a modeset call to remove the
fb from active usage (and are required to be able to take the
mode_config lock), but in the end we need to grab the new fb_lock to
remove the fb from the list. The easiest solution is to add another
mutex to protect this per-file list.
Currently that new fbs_lock nests within the modeset locks and so
appears redudant. But later patches will switch around this sequence
so that taking the modeset locks in the fb destruction path is
optional in the fastpath. Ultimately the goal is that addfb and rmfb
do not require the mode_config lock, since otherwise they have the
potential to introduce stalls in the pageflip sequence of a compositor
(if the compositor e.g. switches to a fullscreen client or if it
enables a plane). But that requires a few more steps and hoops to jump
through.
Note that framebuffer creation/destruction is now double-protected -
once by the fb_lock and in parts by the idr_lock. The later would be
unnecessariy if framebuffers would have their own idr allocator. But
that's material for another patch (series).
v2: Properly initialize the fb->filp_head list in _init, otherwise the
newly added WARN to check whether the fb isn't on a fpriv list any
more will fail for driver-private objects.
v3: Fixup two error-case unlock bugs spotted by Richard Wilbur.
Reviewed-by: Rob Clark <rob@ti.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-12-10 21:19:18 +01:00
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2008-11-07 14:05:41 -08:00
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|
|
drm: revamp locking around fb creation/destruction
Well, at least step 1. The goal here is that framebuffer objects can
survive outside of the mode_config lock, with just a reference held
as protection. The first step to get there is to introduce a special
fb_lock which protects fb lookup, creation and destruction, to make
them appear atomic.
This new fb_lock can nest within the mode_config lock. But the idea is
(once the reference counting part is completed) that we only quickly
take that fb_lock to lookup a framebuffer and grab a reference,
without any other locks involved.
vmwgfx is the only driver which does framebuffer lookups itself, also
wrap those calls to drm_mode_object_find with the new lock.
Also protect the fb_list walking in i915 and omapdrm with the new lock.
As a slight complication there's also the list of user-created fbs
attached to the file private. The problem now is that at fclose() time
we need to walk that list, eventually do a modeset call to remove the
fb from active usage (and are required to be able to take the
mode_config lock), but in the end we need to grab the new fb_lock to
remove the fb from the list. The easiest solution is to add another
mutex to protect this per-file list.
Currently that new fbs_lock nests within the modeset locks and so
appears redudant. But later patches will switch around this sequence
so that taking the modeset locks in the fb destruction path is
optional in the fastpath. Ultimately the goal is that addfb and rmfb
do not require the mode_config lock, since otherwise they have the
potential to introduce stalls in the pageflip sequence of a compositor
(if the compositor e.g. switches to a fullscreen client or if it
enables a plane). But that requires a few more steps and hoops to jump
through.
Note that framebuffer creation/destruction is now double-protected -
once by the fb_lock and in parts by the idr_lock. The later would be
unnecessariy if framebuffers would have their own idr allocator. But
that's material for another patch (series).
v2: Properly initialize the fb->filp_head list in _init, otherwise the
newly added WARN to check whether the fb isn't on a fpriv list any
more will fail for driver-private objects.
v3: Fixup two error-case unlock bugs spotted by Richard Wilbur.
Reviewed-by: Rob Clark <rob@ti.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-12-10 21:19:18 +01:00
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2009-09-12 04:33:34 +10:00
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2011-11-25 15:21:02 +00:00
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2007-07-11 15:53:27 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:32:08 +10:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 15:27:12 +10:00
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2007-07-11 16:32:08 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:32:08 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:53:40 +10:00
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2007-07-11 15:27:12 +10:00
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2007-11-05 12:37:41 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2007-03-23 13:28:33 +11:00
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2007-07-11 16:53:40 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:32:08 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:32:08 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 16:17:42 +10:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2006-10-24 12:03:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:32:08 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:53:40 +10:00
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2005-09-25 14:28:13 +10:00
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2007-05-26 05:01:51 +10:00
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2007-07-11 16:53:40 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:53:40 +10:00
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2005-09-25 14:28:13 +10:00
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2007-05-26 05:01:51 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 16:53:40 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:53:40 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 16:53:40 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:53:40 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 15:27:12 +10:00
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2007-07-11 16:53:40 +10:00
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2005-04-16 15:20:36 -07:00
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2007-11-05 12:37:41 +10:00
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2009-02-02 16:55:46 +11:00
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2009-02-02 16:55:47 +11:00
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2009-02-02 16:55:46 +11:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:53:40 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-12 10:26:44 +10:00
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2009-02-02 16:55:46 +11:00
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2007-11-05 12:37:41 +10:00
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2008-11-28 14:22:24 +10:00
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2008-11-05 10:31:53 -08:00
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2007-07-11 16:53:40 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:53:40 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 15:53:27 +10:00
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2007-07-11 16:53:40 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-11 20:28:11 +10:00
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2007-05-08 15:19:23 +10:00
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2007-07-11 16:53:40 +10:00
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2005-09-11 20:28:11 +10:00
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2007-05-08 15:19:23 +10:00
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2006-01-02 17:18:39 +11:00
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2005-09-11 20:28:11 +10:00
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2008-03-17 10:24:24 +10:00
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2009-02-02 16:55:46 +11:00
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2007-05-08 15:19:23 +10:00
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2007-07-11 16:53:40 +10:00
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2005-09-11 20:28:11 +10:00
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2008-11-05 10:31:53 -08:00
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2008-07-30 12:06:12 -07:00
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2010-09-27 16:17:17 +10:00
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2008-07-30 12:06:12 -07:00
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2008-11-05 10:31:53 -08:00
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2008-07-30 12:06:12 -07:00
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2011-11-25 15:21:02 +00:00
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2008-07-30 12:06:12 -07:00
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2012-10-02 18:01:25 +01:00
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2008-11-07 14:05:41 -08:00
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2008-11-28 14:22:24 +10:00
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2008-12-02 13:38:47 +10:00
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2008-11-28 14:22:24 +10:00
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drm/vblank: Add support for precise vblank timestamping.
The DRI2 swap & sync implementation needs precise
vblank counts and precise timestamps corresponding
to those vblank counts. For conformance to the OpenML
OML_sync_control extension specification the DRM
timestamp associated with a vblank count should
correspond to the start of video scanout of the first
scanline of the video frame following the vblank
interval for that vblank count.
Therefore we need to carry around precise timestamps
for vblanks. Currently the DRM and KMS drivers generate
timestamps ad-hoc via do_gettimeofday() in some
places. The resulting timestamps are sometimes not
very precise due to interrupt handling delays, they
don't conform to OML_sync_control and some are wrong,
as they aren't taken synchronized to the vblank.
This patch implements support inside the drm core
for precise and robust timestamping. It consists
of the following interrelated pieces.
1. Vblank timestamp caching:
A per-crtc ringbuffer stores the most recent vblank
timestamps corresponding to vblank counts.
The ringbuffer can be read out lock-free via the
accessor function:
struct timeval timestamp;
vblankcount = drm_vblank_count_and_time(dev, crtcid, ×tamp).
The function returns the current vblank count and
the corresponding timestamp for start of video
scanout following the vblank interval. It can be
used anywhere between enclosing drm_vblank_get(dev, crtcid)
and drm_vblank_put(dev,crtcid) statements. It is used
inside the drmWaitVblank ioctl and in the vblank event
queueing and handling. It should be used by kms drivers for
timestamping of bufferswap completion.
The timestamp ringbuffer is reinitialized each time
vblank irq's get reenabled in drm_vblank_get()/
drm_update_vblank_count(). It is invalidated when
vblank irq's get disabled.
The ringbuffer is updated inside drm_handle_vblank()
at each vblank irq.
2. Calculation of precise vblank timestamps:
drm_get_last_vbltimestamp() is used to compute the
timestamp for the end of the most recent vblank (if
inside active scanout), or the expected end of the
current vblank interval (if called inside a vblank
interval). The function calls into a new optional kms
driver entry point dev->driver->get_vblank_timestamp()
which is supposed to provide the precise timestamp.
If a kms driver doesn't implement the entry point or
if the call fails, a simple do_gettimeofday() timestamp
is returned as crude approximation of the true vblank time.
A new drm module parameter drm.timestamp_precision_usec
allows to disable high precision timestamps (if set to
zero) or to specify the maximum acceptable error in
the timestamps in microseconds.
Kms drivers could implement their get_vblank_timestamp()
function in a gpu specific way, as long as returned
timestamps conform to OML_sync_control, e.g., by use
of gpu specific hardware timestamps.
Optionally, kms drivers can simply wrap and use the new
utility function drm_calc_vbltimestamp_from_scanoutpos().
This function calls a new optional kms driver function
dev->driver->get_scanout_position() which returns the
current horizontal and vertical video scanout position
of the crtc. The scanout position together with the
drm_display_timing of the current video mode is used
to calculate elapsed time relative to start of active scanout
for the current video frame. This elapsed time is subtracted
from the current do_gettimeofday() time to get the timestamp
corresponding to start of video scanout. Currently
non-interlaced, non-doublescan video modes, with or
without panel scaling are handled correctly. Interlaced/
doublescan modes are tbd in a future patch.
3. Filtering of redundant vblank irq's and removal of
some race-conditions in the vblank irq enable/disable path:
Some gpu's (e.g., Radeon R500/R600) send spurious vblank
irq's outside the vblank if vblank irq's get reenabled.
These get detected by use of the vblank timestamps and
filtered out to avoid miscounting of vblanks.
Some race-conditions between the vblank irq enable/disable
functions, the vblank irq handler and the gpu itself (updating
its hardware vblank counter in the "wrong" moment) are
fixed inside vblank_disable_and_save() and
drm_update_vblank_count() by use of the vblank timestamps and
a new spinlock dev->vblank_time_lock.
The time until vblank irq disable is now configurable via
a new drm module parameter drm.vblankoffdelay to allow
experimentation with timeouts that are much shorter than
the current 5 seconds and should allow longer vblank off
periods for better power savings.
Followup patches will use these new functions to
implement precise timestamping for the intel and radeon
kms drivers.
Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-10-23 04:20:23 +02:00
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2010-12-15 03:16:38 +10:00
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2005-04-16 15:20:36 -07:00
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2005-11-10 22:16:34 +11:00
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2007-07-11 15:53:27 +10:00
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2007-08-25 20:23:09 +10:00
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2007-07-11 15:53:27 +10:00
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2005-11-10 22:16:34 +11:00
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2008-02-20 10:02:20 +10:00
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2007-11-22 14:02:38 +10:00
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2007-09-03 12:06:45 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 15:53:27 +10:00
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2005-09-25 14:28:13 +10:00
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2008-09-30 12:14:26 -07:00
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2012-05-17 13:27:20 +02:00
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2008-09-30 12:14:26 -07:00
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2005-07-10 17:31:26 +10:00
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2007-07-11 15:53:27 +10:00
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2005-07-10 17:31:26 +10:00
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drm/vblank: Add support for precise vblank timestamping.
The DRI2 swap & sync implementation needs precise
vblank counts and precise timestamps corresponding
to those vblank counts. For conformance to the OpenML
OML_sync_control extension specification the DRM
timestamp associated with a vblank count should
correspond to the start of video scanout of the first
scanline of the video frame following the vblank
interval for that vblank count.
Therefore we need to carry around precise timestamps
for vblanks. Currently the DRM and KMS drivers generate
timestamps ad-hoc via do_gettimeofday() in some
places. The resulting timestamps are sometimes not
very precise due to interrupt handling delays, they
don't conform to OML_sync_control and some are wrong,
as they aren't taken synchronized to the vblank.
This patch implements support inside the drm core
for precise and robust timestamping. It consists
of the following interrelated pieces.
1. Vblank timestamp caching:
A per-crtc ringbuffer stores the most recent vblank
timestamps corresponding to vblank counts.
The ringbuffer can be read out lock-free via the
accessor function:
struct timeval timestamp;
vblankcount = drm_vblank_count_and_time(dev, crtcid, ×tamp).
The function returns the current vblank count and
the corresponding timestamp for start of video
scanout following the vblank interval. It can be
used anywhere between enclosing drm_vblank_get(dev, crtcid)
and drm_vblank_put(dev,crtcid) statements. It is used
inside the drmWaitVblank ioctl and in the vblank event
queueing and handling. It should be used by kms drivers for
timestamping of bufferswap completion.
The timestamp ringbuffer is reinitialized each time
vblank irq's get reenabled in drm_vblank_get()/
drm_update_vblank_count(). It is invalidated when
vblank irq's get disabled.
The ringbuffer is updated inside drm_handle_vblank()
at each vblank irq.
2. Calculation of precise vblank timestamps:
drm_get_last_vbltimestamp() is used to compute the
timestamp for the end of the most recent vblank (if
inside active scanout), or the expected end of the
current vblank interval (if called inside a vblank
interval). The function calls into a new optional kms
driver entry point dev->driver->get_vblank_timestamp()
which is supposed to provide the precise timestamp.
If a kms driver doesn't implement the entry point or
if the call fails, a simple do_gettimeofday() timestamp
is returned as crude approximation of the true vblank time.
A new drm module parameter drm.timestamp_precision_usec
allows to disable high precision timestamps (if set to
zero) or to specify the maximum acceptable error in
the timestamps in microseconds.
Kms drivers could implement their get_vblank_timestamp()
function in a gpu specific way, as long as returned
timestamps conform to OML_sync_control, e.g., by use
of gpu specific hardware timestamps.
Optionally, kms drivers can simply wrap and use the new
utility function drm_calc_vbltimestamp_from_scanoutpos().
This function calls a new optional kms driver function
dev->driver->get_scanout_position() which returns the
current horizontal and vertical video scanout position
of the crtc. The scanout position together with the
drm_display_timing of the current video mode is used
to calculate elapsed time relative to start of active scanout
for the current video frame. This elapsed time is subtracted
from the current do_gettimeofday() time to get the timestamp
corresponding to start of video scanout. Currently
non-interlaced, non-doublescan video modes, with or
without panel scaling are handled correctly. Interlaced/
doublescan modes are tbd in a future patch.
3. Filtering of redundant vblank irq's and removal of
some race-conditions in the vblank irq enable/disable path:
Some gpu's (e.g., Radeon R500/R600) send spurious vblank
irq's outside the vblank if vblank irq's get reenabled.
These get detected by use of the vblank timestamps and
filtered out to avoid miscounting of vblanks.
Some race-conditions between the vblank irq enable/disable
functions, the vblank irq handler and the gpu itself (updating
its hardware vblank counter in the "wrong" moment) are
fixed inside vblank_disable_and_save() and
drm_update_vblank_count() by use of the vblank timestamps and
a new spinlock dev->vblank_time_lock.
The time until vblank irq disable is now configurable via
a new drm module parameter drm.vblankoffdelay to allow
experimentation with timeouts that are much shorter than
the current 5 seconds and should allow longer vblank off
periods for better power savings.
Followup patches will use these new functions to
implement precise timestamping for the intel and radeon
kms drivers.
Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-10-23 04:20:23 +02:00
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2011-03-30 22:57:33 -03:00
|
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drm/vblank: Add support for precise vblank timestamping.
The DRI2 swap & sync implementation needs precise
vblank counts and precise timestamps corresponding
to those vblank counts. For conformance to the OpenML
OML_sync_control extension specification the DRM
timestamp associated with a vblank count should
correspond to the start of video scanout of the first
scanline of the video frame following the vblank
interval for that vblank count.
Therefore we need to carry around precise timestamps
for vblanks. Currently the DRM and KMS drivers generate
timestamps ad-hoc via do_gettimeofday() in some
places. The resulting timestamps are sometimes not
very precise due to interrupt handling delays, they
don't conform to OML_sync_control and some are wrong,
as they aren't taken synchronized to the vblank.
This patch implements support inside the drm core
for precise and robust timestamping. It consists
of the following interrelated pieces.
1. Vblank timestamp caching:
A per-crtc ringbuffer stores the most recent vblank
timestamps corresponding to vblank counts.
The ringbuffer can be read out lock-free via the
accessor function:
struct timeval timestamp;
vblankcount = drm_vblank_count_and_time(dev, crtcid, ×tamp).
The function returns the current vblank count and
the corresponding timestamp for start of video
scanout following the vblank interval. It can be
used anywhere between enclosing drm_vblank_get(dev, crtcid)
and drm_vblank_put(dev,crtcid) statements. It is used
inside the drmWaitVblank ioctl and in the vblank event
queueing and handling. It should be used by kms drivers for
timestamping of bufferswap completion.
The timestamp ringbuffer is reinitialized each time
vblank irq's get reenabled in drm_vblank_get()/
drm_update_vblank_count(). It is invalidated when
vblank irq's get disabled.
The ringbuffer is updated inside drm_handle_vblank()
at each vblank irq.
2. Calculation of precise vblank timestamps:
drm_get_last_vbltimestamp() is used to compute the
timestamp for the end of the most recent vblank (if
inside active scanout), or the expected end of the
current vblank interval (if called inside a vblank
interval). The function calls into a new optional kms
driver entry point dev->driver->get_vblank_timestamp()
which is supposed to provide the precise timestamp.
If a kms driver doesn't implement the entry point or
if the call fails, a simple do_gettimeofday() timestamp
is returned as crude approximation of the true vblank time.
A new drm module parameter drm.timestamp_precision_usec
allows to disable high precision timestamps (if set to
zero) or to specify the maximum acceptable error in
the timestamps in microseconds.
Kms drivers could implement their get_vblank_timestamp()
function in a gpu specific way, as long as returned
timestamps conform to OML_sync_control, e.g., by use
of gpu specific hardware timestamps.
Optionally, kms drivers can simply wrap and use the new
utility function drm_calc_vbltimestamp_from_scanoutpos().
This function calls a new optional kms driver function
dev->driver->get_scanout_position() which returns the
current horizontal and vertical video scanout position
of the crtc. The scanout position together with the
drm_display_timing of the current video mode is used
to calculate elapsed time relative to start of active scanout
for the current video frame. This elapsed time is subtracted
from the current do_gettimeofday() time to get the timestamp
corresponding to start of video scanout. Currently
non-interlaced, non-doublescan video modes, with or
without panel scaling are handled correctly. Interlaced/
doublescan modes are tbd in a future patch.
3. Filtering of redundant vblank irq's and removal of
some race-conditions in the vblank irq enable/disable path:
Some gpu's (e.g., Radeon R500/R600) send spurious vblank
irq's outside the vblank if vblank irq's get reenabled.
These get detected by use of the vblank timestamps and
filtered out to avoid miscounting of vblanks.
Some race-conditions between the vblank irq enable/disable
functions, the vblank irq handler and the gpu itself (updating
its hardware vblank counter in the "wrong" moment) are
fixed inside vblank_disable_and_save() and
drm_update_vblank_count() by use of the vblank timestamps and
a new spinlock dev->vblank_time_lock.
The time until vblank irq disable is now configurable via
a new drm module parameter drm.vblankoffdelay to allow
experimentation with timeouts that are much shorter than
the current 5 seconds and should allow longer vblank off
periods for better power savings.
Followup patches will use these new functions to
implement precise timestamping for the intel and radeon
kms drivers.
Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-10-23 04:20:23 +02:00
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|
2011-11-28 20:31:00 -08:00
|
|
|
|
drm/vblank: Add support for precise vblank timestamping.
The DRI2 swap & sync implementation needs precise
vblank counts and precise timestamps corresponding
to those vblank counts. For conformance to the OpenML
OML_sync_control extension specification the DRM
timestamp associated with a vblank count should
correspond to the start of video scanout of the first
scanline of the video frame following the vblank
interval for that vblank count.
Therefore we need to carry around precise timestamps
for vblanks. Currently the DRM and KMS drivers generate
timestamps ad-hoc via do_gettimeofday() in some
places. The resulting timestamps are sometimes not
very precise due to interrupt handling delays, they
don't conform to OML_sync_control and some are wrong,
as they aren't taken synchronized to the vblank.
This patch implements support inside the drm core
for precise and robust timestamping. It consists
of the following interrelated pieces.
1. Vblank timestamp caching:
A per-crtc ringbuffer stores the most recent vblank
timestamps corresponding to vblank counts.
The ringbuffer can be read out lock-free via the
accessor function:
struct timeval timestamp;
vblankcount = drm_vblank_count_and_time(dev, crtcid, ×tamp).
The function returns the current vblank count and
the corresponding timestamp for start of video
scanout following the vblank interval. It can be
used anywhere between enclosing drm_vblank_get(dev, crtcid)
and drm_vblank_put(dev,crtcid) statements. It is used
inside the drmWaitVblank ioctl and in the vblank event
queueing and handling. It should be used by kms drivers for
timestamping of bufferswap completion.
The timestamp ringbuffer is reinitialized each time
vblank irq's get reenabled in drm_vblank_get()/
drm_update_vblank_count(). It is invalidated when
vblank irq's get disabled.
The ringbuffer is updated inside drm_handle_vblank()
at each vblank irq.
2. Calculation of precise vblank timestamps:
drm_get_last_vbltimestamp() is used to compute the
timestamp for the end of the most recent vblank (if
inside active scanout), or the expected end of the
current vblank interval (if called inside a vblank
interval). The function calls into a new optional kms
driver entry point dev->driver->get_vblank_timestamp()
which is supposed to provide the precise timestamp.
If a kms driver doesn't implement the entry point or
if the call fails, a simple do_gettimeofday() timestamp
is returned as crude approximation of the true vblank time.
A new drm module parameter drm.timestamp_precision_usec
allows to disable high precision timestamps (if set to
zero) or to specify the maximum acceptable error in
the timestamps in microseconds.
Kms drivers could implement their get_vblank_timestamp()
function in a gpu specific way, as long as returned
timestamps conform to OML_sync_control, e.g., by use
of gpu specific hardware timestamps.
Optionally, kms drivers can simply wrap and use the new
utility function drm_calc_vbltimestamp_from_scanoutpos().
This function calls a new optional kms driver function
dev->driver->get_scanout_position() which returns the
current horizontal and vertical video scanout position
of the crtc. The scanout position together with the
drm_display_timing of the current video mode is used
to calculate elapsed time relative to start of active scanout
for the current video frame. This elapsed time is subtracted
from the current do_gettimeofday() time to get the timestamp
corresponding to start of video scanout. Currently
non-interlaced, non-doublescan video modes, with or
without panel scaling are handled correctly. Interlaced/
doublescan modes are tbd in a future patch.
3. Filtering of redundant vblank irq's and removal of
some race-conditions in the vblank irq enable/disable path:
Some gpu's (e.g., Radeon R500/R600) send spurious vblank
irq's outside the vblank if vblank irq's get reenabled.
These get detected by use of the vblank timestamps and
filtered out to avoid miscounting of vblanks.
Some race-conditions between the vblank irq enable/disable
functions, the vblank irq handler and the gpu itself (updating
its hardware vblank counter in the "wrong" moment) are
fixed inside vblank_disable_and_save() and
drm_update_vblank_count() by use of the vblank timestamps and
a new spinlock dev->vblank_time_lock.
The time until vblank irq disable is now configurable via
a new drm module parameter drm.vblankoffdelay to allow
experimentation with timeouts that are much shorter than
the current 5 seconds and should allow longer vblank off
periods for better power savings.
Followup patches will use these new functions to
implement precise timestamping for the intel and radeon
kms drivers.
Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-10-23 04:20:23 +02:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-11-10 22:16:34 +11:00
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2007-07-11 15:53:27 +10:00
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2008-09-30 12:14:26 -07:00
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2007-07-11 15:53:27 +10:00
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2007-07-11 15:27:12 +10:00
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2005-11-10 22:16:34 +11:00
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2008-11-28 14:22:24 +10:00
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2009-12-02 18:15:25 +00:00
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2008-11-28 14:22:24 +10:00
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2009-02-17 20:08:49 -05:00
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2008-07-30 12:06:12 -07:00
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2011-06-09 00:24:59 +00:00
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2008-07-30 12:06:12 -07:00
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2011-11-25 15:21:02 +00:00
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2013-01-15 20:47:42 +00:00
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2011-11-25 15:21:02 +00:00
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2009-09-21 14:33:58 +10:00
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2011-02-07 12:16:14 +10:00
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2008-11-05 10:31:53 -08:00
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2012-05-17 13:27:22 +02:00
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2008-11-05 10:31:53 -08:00
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2005-11-10 22:16:34 +11:00
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2005-04-16 15:20:36 -07:00
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2007-09-03 12:06:45 +10:00
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2005-04-16 15:20:36 -07:00
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2011-10-31 07:28:57 -07:00
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2010-12-15 03:16:38 +10:00
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2010-12-15 07:13:55 +10:00
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2010-12-15 03:16:38 +10:00
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2008-11-28 13:43:47 +10:00
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2005-04-16 15:20:36 -07:00
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2008-04-21 16:47:32 +10:00
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2008-11-07 14:05:41 -08:00
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2008-04-21 16:47:32 +10:00
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2009-02-17 20:08:49 -05:00
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2005-04-16 15:20:36 -07:00
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2008-04-21 16:47:32 +10:00
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2005-04-16 15:20:36 -07:00
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2008-04-21 16:47:32 +10:00
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2005-04-16 15:20:36 -07:00
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2009-02-17 20:08:49 -05:00
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2011-11-09 22:20:35 +01:00
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2009-02-17 20:08:49 -05:00
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2008-11-28 14:22:24 +10:00
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2008-11-07 14:05:41 -08:00
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2007-07-11 15:53:27 +10:00
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2005-04-16 15:20:36 -07:00
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2011-04-17 07:43:32 +01:00
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2009-09-12 04:33:34 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 15:53:27 +10:00
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2008-11-28 13:43:47 +10:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2006-02-02 19:37:46 +11:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 15:27:12 +10:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2007-05-26 05:01:51 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2007-05-26 05:01:51 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-12 10:26:44 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2007-05-26 05:01:51 +10:00
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2005-09-25 14:28:13 +10:00
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2006-02-02 19:37:46 +11:00
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2005-04-16 15:20:36 -07:00
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2007-07-17 10:46:52 +10:00
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2005-04-16 15:20:36 -07:00
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2007-05-26 05:01:51 +10:00
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2008-11-07 14:05:41 -08:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2011-10-26 00:54:41 +02:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 16:32:08 +10:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2008-09-30 12:14:26 -07:00
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drm/vblank: Add support for precise vblank timestamping.
The DRI2 swap & sync implementation needs precise
vblank counts and precise timestamps corresponding
to those vblank counts. For conformance to the OpenML
OML_sync_control extension specification the DRM
timestamp associated with a vblank count should
correspond to the start of video scanout of the first
scanline of the video frame following the vblank
interval for that vblank count.
Therefore we need to carry around precise timestamps
for vblanks. Currently the DRM and KMS drivers generate
timestamps ad-hoc via do_gettimeofday() in some
places. The resulting timestamps are sometimes not
very precise due to interrupt handling delays, they
don't conform to OML_sync_control and some are wrong,
as they aren't taken synchronized to the vblank.
This patch implements support inside the drm core
for precise and robust timestamping. It consists
of the following interrelated pieces.
1. Vblank timestamp caching:
A per-crtc ringbuffer stores the most recent vblank
timestamps corresponding to vblank counts.
The ringbuffer can be read out lock-free via the
accessor function:
struct timeval timestamp;
vblankcount = drm_vblank_count_and_time(dev, crtcid, ×tamp).
The function returns the current vblank count and
the corresponding timestamp for start of video
scanout following the vblank interval. It can be
used anywhere between enclosing drm_vblank_get(dev, crtcid)
and drm_vblank_put(dev,crtcid) statements. It is used
inside the drmWaitVblank ioctl and in the vblank event
queueing and handling. It should be used by kms drivers for
timestamping of bufferswap completion.
The timestamp ringbuffer is reinitialized each time
vblank irq's get reenabled in drm_vblank_get()/
drm_update_vblank_count(). It is invalidated when
vblank irq's get disabled.
The ringbuffer is updated inside drm_handle_vblank()
at each vblank irq.
2. Calculation of precise vblank timestamps:
drm_get_last_vbltimestamp() is used to compute the
timestamp for the end of the most recent vblank (if
inside active scanout), or the expected end of the
current vblank interval (if called inside a vblank
interval). The function calls into a new optional kms
driver entry point dev->driver->get_vblank_timestamp()
which is supposed to provide the precise timestamp.
If a kms driver doesn't implement the entry point or
if the call fails, a simple do_gettimeofday() timestamp
is returned as crude approximation of the true vblank time.
A new drm module parameter drm.timestamp_precision_usec
allows to disable high precision timestamps (if set to
zero) or to specify the maximum acceptable error in
the timestamps in microseconds.
Kms drivers could implement their get_vblank_timestamp()
function in a gpu specific way, as long as returned
timestamps conform to OML_sync_control, e.g., by use
of gpu specific hardware timestamps.
Optionally, kms drivers can simply wrap and use the new
utility function drm_calc_vbltimestamp_from_scanoutpos().
This function calls a new optional kms driver function
dev->driver->get_scanout_position() which returns the
current horizontal and vertical video scanout position
of the crtc. The scanout position together with the
drm_display_timing of the current video mode is used
to calculate elapsed time relative to start of active scanout
for the current video frame. This elapsed time is subtracted
from the current do_gettimeofday() time to get the timestamp
corresponding to start of video scanout. Currently
non-interlaced, non-doublescan video modes, with or
without panel scaling are handled correctly. Interlaced/
doublescan modes are tbd in a future patch.
3. Filtering of redundant vblank irq's and removal of
some race-conditions in the vblank irq enable/disable path:
Some gpu's (e.g., Radeon R500/R600) send spurious vblank
irq's outside the vblank if vblank irq's get reenabled.
These get detected by use of the vblank timestamps and
filtered out to avoid miscounting of vblanks.
Some race-conditions between the vblank irq enable/disable
functions, the vblank irq handler and the gpu itself (updating
its hardware vblank counter in the "wrong" moment) are
fixed inside vblank_disable_and_save() and
drm_update_vblank_count() by use of the vblank timestamps and
a new spinlock dev->vblank_time_lock.
The time until vblank irq disable is now configurable via
a new drm module parameter drm.vblankoffdelay to allow
experimentation with timeouts that are much shorter than
the current 5 seconds and should allow longer vblank off
periods for better power savings.
Followup patches will use these new functions to
implement precise timestamping for the intel and radeon
kms drivers.
Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-10-23 04:20:23 +02:00
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2005-09-25 14:28:13 +10:00
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2008-09-30 12:14:26 -07:00
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2008-12-19 17:23:38 -08:00
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2008-09-30 12:14:26 -07:00
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2005-04-16 15:20:36 -07:00
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2009-09-12 04:33:34 +10:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:53:40 +10:00
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2005-04-16 15:20:36 -07:00
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2010-05-27 13:40:25 -06:00
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2005-09-25 14:28:13 +10:00
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2006-09-22 04:19:34 +10:00
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2005-04-16 15:20:36 -07:00
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2010-05-27 13:40:25 -06:00
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2010-12-15 07:13:55 +10:00
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2010-05-27 13:40:25 -06:00
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2007-07-11 16:53:40 +10:00
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2011-02-24 08:35:06 +10:00
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2005-09-25 14:28:13 +10:00
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2008-11-05 10:31:53 -08:00
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2007-07-11 16:53:40 +10:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2009-02-02 16:55:46 +11:00
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2005-08-05 22:11:22 +10:00
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2008-11-07 14:05:41 -08:00
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2008-04-21 16:47:32 +10:00
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2006-10-24 23:04:19 +10:00
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2008-11-07 14:05:41 -08:00
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2008-07-30 12:06:12 -07:00
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2010-12-07 09:20:40 +10:00
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2012-02-20 14:18:07 +00:00
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2007-07-11 15:53:27 +10:00
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2005-04-16 15:20:36 -07:00
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2010-12-07 09:20:40 +10:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2010-05-27 13:40:25 -06:00
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2010-12-15 03:16:38 +10:00
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2010-05-27 13:40:25 -06:00
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2006-08-07 20:23:42 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2006-01-02 16:23:01 +11:00
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2005-04-16 15:20:36 -07:00
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2006-01-12 20:44:30 +11:00
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2005-04-16 15:20:36 -07:00
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2012-02-20 14:18:07 +00:00
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drm: review locking rules in drm_crtc.c
- config_cleanup was confused: It claimed that callers need to hold
the modeset lock, but the connector|encoder_cleanup helpers grabbed
that themselves (note that crtc_cleanup did _not_ grab the modeset
lock). Which resulted in all drivers _not_ hodling the lock. Since
this is for single-threaded cleanup code, drop the requirement from
docs and also drop the lock_grabbing from all _cleanup functions.
- Kill the LOCKING section in the doctype, since clearly we're not
good enough to keep them up-to-date. And misleading locking
documentation is worse than useless (see e.g. the comment in the
vmgfx driver about the cleanup mess). And since for most functions
the very first line either grabs the lock or has a WARN_ON(!locked)
the documentation doesn't really add anything.
- Instead put in some effort into explaining the only two special
cases a bit better: config_init and config_cleanup are both called
from single-threaded setup/teardown code, so don't do any locking.
It's the driver's job though to enforce this.
- Where lacking, add a WARN_ON(!is_locked). Not many places though,
since locking around fbdev setup/teardown is through-roughly screwed
up, and so will break almost every single WARN annotation I've tried
to add.
- Add a drm_modeset_is_locked helper - the Grate Modset Locking Rework
will use the compiler to assist in the big reorg by renaming the
mode lock, so start encapsulating things. Unfortunately this ended
up in the "wrong" header file since it needs the definition of
struct drm_device.
v2: Drop most WARNS again - we hit them all over the place, mostly in
the setup and teardown sequences. And trying to fix it up leads to
nice deadlocks, since the locking in the setup code is really
inconsistent.
Reviewed-by: Rob Clark <rob@ti.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-12-01 23:43:11 +01:00
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2005-04-16 15:20:36 -07:00
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2009-12-16 22:17:09 +00:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 15:53:27 +10:00
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2005-04-16 15:20:36 -07:00
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2010-07-10 23:51:39 +02:00
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2005-09-25 14:28:13 +10:00
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2009-09-12 04:33:34 +10:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 14:28:13 +10:00
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2008-11-05 10:31:53 -08:00
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2012-05-01 11:04:51 -05:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2012-10-02 18:01:25 +01:00
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2010-08-23 22:53:35 +02:00
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2005-09-25 14:28:13 +10:00
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2008-07-30 12:06:12 -07:00
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2008-10-14 19:55:10 -07:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2007-09-03 12:06:45 +10:00
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2011-02-21 11:17:35 +10:00
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2007-09-03 12:06:45 +10:00
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2005-04-16 15:20:36 -07:00
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2007-09-03 12:06:45 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 15:53:27 +10:00
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2005-04-16 15:20:36 -07:00
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2007-09-03 12:06:45 +10:00
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2005-04-16 15:20:36 -07:00
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2007-09-03 12:06:45 +10:00
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2012-01-24 18:54:21 +01:00
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2005-04-16 15:20:36 -07:00
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2008-07-30 12:06:12 -07:00
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2012-06-01 15:20:22 +01:00
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2012-03-25 19:47:30 +02:00
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2008-07-30 12:06:12 -07:00
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2005-04-16 15:20:36 -07:00
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2007-09-03 12:06:45 +10:00
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2007-07-11 16:53:40 +10:00
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2007-03-23 13:28:33 +11:00
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2007-09-03 12:06:45 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 15:53:27 +10:00
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2009-02-02 16:55:47 +11:00
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2007-07-11 15:27:12 +10:00
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2009-02-02 16:55:46 +11:00
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2007-09-03 12:06:45 +10:00
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2009-02-02 16:55:46 +11:00
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2007-09-03 12:06:45 +10:00
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2005-09-25 14:28:13 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 15:53:27 +10:00
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2007-07-11 16:17:42 +10:00
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2007-08-25 20:23:09 +10:00
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2005-04-16 15:20:36 -07:00
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2007-09-03 12:06:45 +10:00
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2008-08-20 11:04:27 -04:00
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2007-07-11 15:53:27 +10:00
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2005-04-16 15:20:36 -07:00
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2008-09-30 12:14:26 -07:00
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2008-05-07 12:15:39 +10:00
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2008-09-30 12:14:26 -07:00
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2008-05-07 12:15:39 +10:00
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2008-09-30 12:14:26 -07:00
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drm/vblank: Add support for precise vblank timestamping.
The DRI2 swap & sync implementation needs precise
vblank counts and precise timestamps corresponding
to those vblank counts. For conformance to the OpenML
OML_sync_control extension specification the DRM
timestamp associated with a vblank count should
correspond to the start of video scanout of the first
scanline of the video frame following the vblank
interval for that vblank count.
Therefore we need to carry around precise timestamps
for vblanks. Currently the DRM and KMS drivers generate
timestamps ad-hoc via do_gettimeofday() in some
places. The resulting timestamps are sometimes not
very precise due to interrupt handling delays, they
don't conform to OML_sync_control and some are wrong,
as they aren't taken synchronized to the vblank.
This patch implements support inside the drm core
for precise and robust timestamping. It consists
of the following interrelated pieces.
1. Vblank timestamp caching:
A per-crtc ringbuffer stores the most recent vblank
timestamps corresponding to vblank counts.
The ringbuffer can be read out lock-free via the
accessor function:
struct timeval timestamp;
vblankcount = drm_vblank_count_and_time(dev, crtcid, ×tamp).
The function returns the current vblank count and
the corresponding timestamp for start of video
scanout following the vblank interval. It can be
used anywhere between enclosing drm_vblank_get(dev, crtcid)
and drm_vblank_put(dev,crtcid) statements. It is used
inside the drmWaitVblank ioctl and in the vblank event
queueing and handling. It should be used by kms drivers for
timestamping of bufferswap completion.
The timestamp ringbuffer is reinitialized each time
vblank irq's get reenabled in drm_vblank_get()/
drm_update_vblank_count(). It is invalidated when
vblank irq's get disabled.
The ringbuffer is updated inside drm_handle_vblank()
at each vblank irq.
2. Calculation of precise vblank timestamps:
drm_get_last_vbltimestamp() is used to compute the
timestamp for the end of the most recent vblank (if
inside active scanout), or the expected end of the
current vblank interval (if called inside a vblank
interval). The function calls into a new optional kms
driver entry point dev->driver->get_vblank_timestamp()
which is supposed to provide the precise timestamp.
If a kms driver doesn't implement the entry point or
if the call fails, a simple do_gettimeofday() timestamp
is returned as crude approximation of the true vblank time.
A new drm module parameter drm.timestamp_precision_usec
allows to disable high precision timestamps (if set to
zero) or to specify the maximum acceptable error in
the timestamps in microseconds.
Kms drivers could implement their get_vblank_timestamp()
function in a gpu specific way, as long as returned
timestamps conform to OML_sync_control, e.g., by use
of gpu specific hardware timestamps.
Optionally, kms drivers can simply wrap and use the new
utility function drm_calc_vbltimestamp_from_scanoutpos().
This function calls a new optional kms driver function
dev->driver->get_scanout_position() which returns the
current horizontal and vertical video scanout position
of the crtc. The scanout position together with the
drm_display_timing of the current video mode is used
to calculate elapsed time relative to start of active scanout
for the current video frame. This elapsed time is subtracted
from the current do_gettimeofday() time to get the timestamp
corresponding to start of video scanout. Currently
non-interlaced, non-doublescan video modes, with or
without panel scaling are handled correctly. Interlaced/
doublescan modes are tbd in a future patch.
3. Filtering of redundant vblank irq's and removal of
some race-conditions in the vblank irq enable/disable path:
Some gpu's (e.g., Radeon R500/R600) send spurious vblank
irq's outside the vblank if vblank irq's get reenabled.
These get detected by use of the vblank timestamps and
filtered out to avoid miscounting of vblanks.
Some race-conditions between the vblank irq enable/disable
functions, the vblank irq handler and the gpu itself (updating
its hardware vblank counter in the "wrong" moment) are
fixed inside vblank_disable_and_save() and
drm_update_vblank_count() by use of the vblank timestamps and
a new spinlock dev->vblank_time_lock.
The time until vblank irq disable is now configurable via
a new drm module parameter drm.vblankoffdelay to allow
experimentation with timeouts that are much shorter than
the current 5 seconds and should allow longer vblank off
periods for better power savings.
Followup patches will use these new functions to
implement precise timestamping for the intel and radeon
kms drivers.
Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-10-23 04:20:23 +02:00
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2012-10-16 22:48:40 +00:00
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drm/i915: Suppress spurious vblank interrupts
Hugh Dickins found that characters in xterm were going missing and oft
delayed. Being the curious type, he managed to associate this with the
new high-precision vblank patches; disabling these he found, restored
the orderliness of his characters.
The oddness begins when one realised that Hugh was not using vblanks at
all on his system (fvwm and some xterms). Instead, all he had to go on
were warning of a pipe underrun, curiously enough at around 60Hz. He
poked and found that in addition to the underrun warning, the hardware
was flagging the start of a new frame, a vblank, which in turn was
kicking off the pending vblank processing code.
There is little we can do for the underruns on Hugh's machine, a
Crestline [965GM], which must have its FIFO watermarks set to 8.
However, we do not need to process the vblank if we know that they are
disabled...
Reported-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
2011-01-31 10:48:04 +00:00
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2008-09-30 12:14:26 -07:00
|
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2009-11-09 12:51:22 +08:00
|
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2008-11-18 09:30:25 -08:00
|
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|
drm/vblank: Add support for precise vblank timestamping.
The DRI2 swap & sync implementation needs precise
vblank counts and precise timestamps corresponding
to those vblank counts. For conformance to the OpenML
OML_sync_control extension specification the DRM
timestamp associated with a vblank count should
correspond to the start of video scanout of the first
scanline of the video frame following the vblank
interval for that vblank count.
Therefore we need to carry around precise timestamps
for vblanks. Currently the DRM and KMS drivers generate
timestamps ad-hoc via do_gettimeofday() in some
places. The resulting timestamps are sometimes not
very precise due to interrupt handling delays, they
don't conform to OML_sync_control and some are wrong,
as they aren't taken synchronized to the vblank.
This patch implements support inside the drm core
for precise and robust timestamping. It consists
of the following interrelated pieces.
1. Vblank timestamp caching:
A per-crtc ringbuffer stores the most recent vblank
timestamps corresponding to vblank counts.
The ringbuffer can be read out lock-free via the
accessor function:
struct timeval timestamp;
vblankcount = drm_vblank_count_and_time(dev, crtcid, ×tamp).
The function returns the current vblank count and
the corresponding timestamp for start of video
scanout following the vblank interval. It can be
used anywhere between enclosing drm_vblank_get(dev, crtcid)
and drm_vblank_put(dev,crtcid) statements. It is used
inside the drmWaitVblank ioctl and in the vblank event
queueing and handling. It should be used by kms drivers for
timestamping of bufferswap completion.
The timestamp ringbuffer is reinitialized each time
vblank irq's get reenabled in drm_vblank_get()/
drm_update_vblank_count(). It is invalidated when
vblank irq's get disabled.
The ringbuffer is updated inside drm_handle_vblank()
at each vblank irq.
2. Calculation of precise vblank timestamps:
drm_get_last_vbltimestamp() is used to compute the
timestamp for the end of the most recent vblank (if
inside active scanout), or the expected end of the
current vblank interval (if called inside a vblank
interval). The function calls into a new optional kms
driver entry point dev->driver->get_vblank_timestamp()
which is supposed to provide the precise timestamp.
If a kms driver doesn't implement the entry point or
if the call fails, a simple do_gettimeofday() timestamp
is returned as crude approximation of the true vblank time.
A new drm module parameter drm.timestamp_precision_usec
allows to disable high precision timestamps (if set to
zero) or to specify the maximum acceptable error in
the timestamps in microseconds.
Kms drivers could implement their get_vblank_timestamp()
function in a gpu specific way, as long as returned
timestamps conform to OML_sync_control, e.g., by use
of gpu specific hardware timestamps.
Optionally, kms drivers can simply wrap and use the new
utility function drm_calc_vbltimestamp_from_scanoutpos().
This function calls a new optional kms driver function
dev->driver->get_scanout_position() which returns the
current horizontal and vertical video scanout position
of the crtc. The scanout position together with the
drm_display_timing of the current video mode is used
to calculate elapsed time relative to start of active scanout
for the current video frame. This elapsed time is subtracted
from the current do_gettimeofday() time to get the timestamp
corresponding to start of video scanout. Currently
non-interlaced, non-doublescan video modes, with or
without panel scaling are handled correctly. Interlaced/
doublescan modes are tbd in a future patch.
3. Filtering of redundant vblank irq's and removal of
some race-conditions in the vblank irq enable/disable path:
Some gpu's (e.g., Radeon R500/R600) send spurious vblank
irq's outside the vblank if vblank irq's get reenabled.
These get detected by use of the vblank timestamps and
filtered out to avoid miscounting of vblanks.
Some race-conditions between the vblank irq enable/disable
functions, the vblank irq handler and the gpu itself (updating
its hardware vblank counter in the "wrong" moment) are
fixed inside vblank_disable_and_save() and
drm_update_vblank_count() by use of the vblank timestamps and
a new spinlock dev->vblank_time_lock.
The time until vblank irq disable is now configurable via
a new drm module parameter drm.vblankoffdelay to allow
experimentation with timeouts that are much shorter than
the current 5 seconds and should allow longer vblank off
periods for better power savings.
Followup patches will use these new functions to
implement precise timestamping for the intel and radeon
kms drivers.
Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-10-23 04:20:23 +02:00
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2011-04-17 07:43:32 +01:00
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2012-11-14 11:22:52 +01:00
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2012-10-28 18:28:06 +01:00
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2012-11-14 11:22:52 +01:00
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2008-09-30 12:14:26 -07:00
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2008-11-07 14:05:41 -08:00
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2008-09-30 12:14:26 -07:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 16:53:40 +10:00
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2007-07-11 15:53:27 +10:00
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2007-09-03 12:06:45 +10:00
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2007-07-11 15:53:27 +10:00
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2007-09-03 12:06:45 +10:00
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2007-07-11 15:53:27 +10:00
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2007-09-03 12:06:45 +10:00
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2007-07-11 15:53:27 +10:00
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2007-09-03 12:06:45 +10:00
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2007-07-11 15:53:27 +10:00
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2007-09-03 12:06:45 +10:00
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2007-07-11 15:53:27 +10:00
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2007-09-03 12:06:45 +10:00
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2007-07-11 15:53:27 +10:00
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2007-09-03 12:06:45 +10:00
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2005-04-16 15:20:36 -07:00
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2008-11-28 14:22:24 +10:00
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2010-12-15 03:16:38 +10:00
|
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2009-01-04 16:55:33 -05:00
|
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2008-04-21 16:47:32 +10:00
|
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2012-02-20 14:18:07 +00:00
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2005-09-25 14:28:13 +10:00
|
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2008-04-21 16:47:32 +10:00
|
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|
drm/vblank: Add support for precise vblank timestamping.
The DRI2 swap & sync implementation needs precise
vblank counts and precise timestamps corresponding
to those vblank counts. For conformance to the OpenML
OML_sync_control extension specification the DRM
timestamp associated with a vblank count should
correspond to the start of video scanout of the first
scanline of the video frame following the vblank
interval for that vblank count.
Therefore we need to carry around precise timestamps
for vblanks. Currently the DRM and KMS drivers generate
timestamps ad-hoc via do_gettimeofday() in some
places. The resulting timestamps are sometimes not
very precise due to interrupt handling delays, they
don't conform to OML_sync_control and some are wrong,
as they aren't taken synchronized to the vblank.
This patch implements support inside the drm core
for precise and robust timestamping. It consists
of the following interrelated pieces.
1. Vblank timestamp caching:
A per-crtc ringbuffer stores the most recent vblank
timestamps corresponding to vblank counts.
The ringbuffer can be read out lock-free via the
accessor function:
struct timeval timestamp;
vblankcount = drm_vblank_count_and_time(dev, crtcid, ×tamp).
The function returns the current vblank count and
the corresponding timestamp for start of video
scanout following the vblank interval. It can be
used anywhere between enclosing drm_vblank_get(dev, crtcid)
and drm_vblank_put(dev,crtcid) statements. It is used
inside the drmWaitVblank ioctl and in the vblank event
queueing and handling. It should be used by kms drivers for
timestamping of bufferswap completion.
The timestamp ringbuffer is reinitialized each time
vblank irq's get reenabled in drm_vblank_get()/
drm_update_vblank_count(). It is invalidated when
vblank irq's get disabled.
The ringbuffer is updated inside drm_handle_vblank()
at each vblank irq.
2. Calculation of precise vblank timestamps:
drm_get_last_vbltimestamp() is used to compute the
timestamp for the end of the most recent vblank (if
inside active scanout), or the expected end of the
current vblank interval (if called inside a vblank
interval). The function calls into a new optional kms
driver entry point dev->driver->get_vblank_timestamp()
which is supposed to provide the precise timestamp.
If a kms driver doesn't implement the entry point or
if the call fails, a simple do_gettimeofday() timestamp
is returned as crude approximation of the true vblank time.
A new drm module parameter drm.timestamp_precision_usec
allows to disable high precision timestamps (if set to
zero) or to specify the maximum acceptable error in
the timestamps in microseconds.
Kms drivers could implement their get_vblank_timestamp()
function in a gpu specific way, as long as returned
timestamps conform to OML_sync_control, e.g., by use
of gpu specific hardware timestamps.
Optionally, kms drivers can simply wrap and use the new
utility function drm_calc_vbltimestamp_from_scanoutpos().
This function calls a new optional kms driver function
dev->driver->get_scanout_position() which returns the
current horizontal and vertical video scanout position
of the crtc. The scanout position together with the
drm_display_timing of the current video mode is used
to calculate elapsed time relative to start of active scanout
for the current video frame. This elapsed time is subtracted
from the current do_gettimeofday() time to get the timestamp
corresponding to start of video scanout. Currently
non-interlaced, non-doublescan video modes, with or
without panel scaling are handled correctly. Interlaced/
doublescan modes are tbd in a future patch.
3. Filtering of redundant vblank irq's and removal of
some race-conditions in the vblank irq enable/disable path:
Some gpu's (e.g., Radeon R500/R600) send spurious vblank
irq's outside the vblank if vblank irq's get reenabled.
These get detected by use of the vblank timestamps and
filtered out to avoid miscounting of vblanks.
Some race-conditions between the vblank irq enable/disable
functions, the vblank irq handler and the gpu itself (updating
its hardware vblank counter in the "wrong" moment) are
fixed inside vblank_disable_and_save() and
drm_update_vblank_count() by use of the vblank timestamps and
a new spinlock dev->vblank_time_lock.
The time until vblank irq disable is now configurable via
a new drm module parameter drm.vblankoffdelay to allow
experimentation with timeouts that are much shorter than
the current 5 seconds and should allow longer vblank off
periods for better power savings.
Followup patches will use these new functions to
implement precise timestamping for the intel and radeon
kms drivers.
Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-10-23 04:20:23 +02:00
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2012-10-23 18:53:26 +00:00
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drm/vblank: Add support for precise vblank timestamping.
The DRI2 swap & sync implementation needs precise
vblank counts and precise timestamps corresponding
to those vblank counts. For conformance to the OpenML
OML_sync_control extension specification the DRM
timestamp associated with a vblank count should
correspond to the start of video scanout of the first
scanline of the video frame following the vblank
interval for that vblank count.
Therefore we need to carry around precise timestamps
for vblanks. Currently the DRM and KMS drivers generate
timestamps ad-hoc via do_gettimeofday() in some
places. The resulting timestamps are sometimes not
very precise due to interrupt handling delays, they
don't conform to OML_sync_control and some are wrong,
as they aren't taken synchronized to the vblank.
This patch implements support inside the drm core
for precise and robust timestamping. It consists
of the following interrelated pieces.
1. Vblank timestamp caching:
A per-crtc ringbuffer stores the most recent vblank
timestamps corresponding to vblank counts.
The ringbuffer can be read out lock-free via the
accessor function:
struct timeval timestamp;
vblankcount = drm_vblank_count_and_time(dev, crtcid, ×tamp).
The function returns the current vblank count and
the corresponding timestamp for start of video
scanout following the vblank interval. It can be
used anywhere between enclosing drm_vblank_get(dev, crtcid)
and drm_vblank_put(dev,crtcid) statements. It is used
inside the drmWaitVblank ioctl and in the vblank event
queueing and handling. It should be used by kms drivers for
timestamping of bufferswap completion.
The timestamp ringbuffer is reinitialized each time
vblank irq's get reenabled in drm_vblank_get()/
drm_update_vblank_count(). It is invalidated when
vblank irq's get disabled.
The ringbuffer is updated inside drm_handle_vblank()
at each vblank irq.
2. Calculation of precise vblank timestamps:
drm_get_last_vbltimestamp() is used to compute the
timestamp for the end of the most recent vblank (if
inside active scanout), or the expected end of the
current vblank interval (if called inside a vblank
interval). The function calls into a new optional kms
driver entry point dev->driver->get_vblank_timestamp()
which is supposed to provide the precise timestamp.
If a kms driver doesn't implement the entry point or
if the call fails, a simple do_gettimeofday() timestamp
is returned as crude approximation of the true vblank time.
A new drm module parameter drm.timestamp_precision_usec
allows to disable high precision timestamps (if set to
zero) or to specify the maximum acceptable error in
the timestamps in microseconds.
Kms drivers could implement their get_vblank_timestamp()
function in a gpu specific way, as long as returned
timestamps conform to OML_sync_control, e.g., by use
of gpu specific hardware timestamps.
Optionally, kms drivers can simply wrap and use the new
utility function drm_calc_vbltimestamp_from_scanoutpos().
This function calls a new optional kms driver function
dev->driver->get_scanout_position() which returns the
current horizontal and vertical video scanout position
of the crtc. The scanout position together with the
drm_display_timing of the current video mode is used
to calculate elapsed time relative to start of active scanout
for the current video frame. This elapsed time is subtracted
from the current do_gettimeofday() time to get the timestamp
corresponding to start of video scanout. Currently
non-interlaced, non-doublescan video modes, with or
without panel scaling are handled correctly. Interlaced/
doublescan modes are tbd in a future patch.
3. Filtering of redundant vblank irq's and removal of
some race-conditions in the vblank irq enable/disable path:
Some gpu's (e.g., Radeon R500/R600) send spurious vblank
irq's outside the vblank if vblank irq's get reenabled.
These get detected by use of the vblank timestamps and
filtered out to avoid miscounting of vblanks.
Some race-conditions between the vblank irq enable/disable
functions, the vblank irq handler and the gpu itself (updating
its hardware vblank counter in the "wrong" moment) are
fixed inside vblank_disable_and_save() and
drm_update_vblank_count() by use of the vblank timestamps and
a new spinlock dev->vblank_time_lock.
The time until vblank irq disable is now configurable via
a new drm module parameter drm.vblankoffdelay to allow
experimentation with timeouts that are much shorter than
the current 5 seconds and should allow longer vblank off
periods for better power savings.
Followup patches will use these new functions to
implement precise timestamping for the intel and radeon
kms drivers.
Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-10-23 04:20:23 +02:00
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2005-04-16 15:20:36 -07:00
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2008-04-21 16:47:32 +10:00
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2009-02-02 16:55:46 +11:00
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2007-05-26 05:04:51 +10:00
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2005-04-16 15:20:36 -07:00
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2008-04-21 16:47:32 +10:00
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2011-11-25 15:21:02 +00:00
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2013-01-15 20:47:42 +00:00
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2011-11-25 15:21:02 +00:00
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2013-01-15 20:47:42 +00:00
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2011-11-25 15:21:02 +00:00
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2012-05-18 15:40:33 +01:00
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2011-11-25 15:21:02 +00:00
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2007-07-11 16:53:40 +10:00
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2007-09-03 12:06:45 +10:00
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2005-09-25 14:28:13 +10:00
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2007-07-11 15:53:27 +10:00
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2007-07-11 16:53:40 +10:00
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2007-07-11 15:53:27 +10:00
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2005-04-16 15:20:36 -07:00
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2007-07-11 15:53:27 +10:00
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2010-01-05 11:25:05 +08:00
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2007-07-11 15:53:27 +10:00
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2005-04-16 15:20:36 -07:00
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2007-11-22 14:02:38 +10:00
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2007-11-22 14:02:38 +10:00
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2008-04-21 16:47:32 +10:00
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2008-11-07 14:05:41 -08:00
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2008-04-21 16:47:32 +10:00
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2008-11-07 14:05:41 -08:00
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2010-04-09 19:05:05 +00:00
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2008-07-30 12:06:12 -07:00
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2010-04-09 19:05:04 +00:00
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2011-06-07 14:17:51 +01:00
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2010-09-27 16:17:17 +10:00
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2008-11-05 10:31:53 -08:00
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2012-10-02 18:01:25 +01:00
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2010-03-09 10:56:52 +10:00
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2008-07-30 12:06:12 -07:00
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