When disabling the MMU, it is necessary to take out a 1:1 identity map
of the reset code so that it can safely be executed with and without
the MMU active. To avoid the situation where the physical address of the
reset code aliases with the virtual address of the active stack (which
cannot be included in the 1:1 mapping), it is desirable to change to a
new stack at a location which is less likely to alias.
This code adds a new lib function, call_with_stack:
void call_with_stack(void (*fn)(void *), void *arg, void *sp);
which changes the stack to point at the sp parameter, before invoking
fn(arg) with the new stack selected.
Reviewed-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Commit 1939dd84b3 ("ext4: cleanup ext4_ext_grow_indepth code") added a
reference to ext4_extent_header.eh_depth, but forget to pass the value
read through le16_to_cpu. The result is a crash on big-endian
machines, such as this crash on a POWER7 server:
attempt to access beyond end of device
sda8: rw=0, want=776392648163376, limit=168558560
Unable to handle kernel paging request for data at address 0x6b6b6b6b6b6b6bcb
Faulting instruction address: 0xc0000000001f5f38
cpu 0x14: Vector: 300 (Data Access) at [c000001bd1aaecf0]
pc: c0000000001f5f38: .__brelse+0x18/0x60
lr: c0000000002e07a4: .ext4_ext_drop_refs+0x44/0x80
sp: c000001bd1aaef70
msr: 9000000000009032
dar: 6b6b6b6b6b6b6bcb
dsisr: 40000000
current = 0xc000001bd15b8010
paca = 0xc00000000ffe4600
pid = 19911, comm = flush-8:0
enter ? for help
[c000001bd1aaeff0] c0000000002e07a4 .ext4_ext_drop_refs+0x44/0x80
[c000001bd1aaf090] c0000000002e0c58 .ext4_ext_find_extent+0x408/0x4c0
[c000001bd1aaf180] c0000000002e145c .ext4_ext_insert_extent+0x2bc/0x14c0
[c000001bd1aaf2c0] c0000000002e3fb8 .ext4_ext_map_blocks+0x628/0x1710
[c000001bd1aaf420] c0000000002b2974 .ext4_map_blocks+0x224/0x310
[c000001bd1aaf4d0] c0000000002b7f2c .mpage_da_map_and_submit+0xbc/0x490
[c000001bd1aaf5a0] c0000000002b8688 .write_cache_pages_da+0x2c8/0x430
[c000001bd1aaf720] c0000000002b8b28 .ext4_da_writepages+0x338/0x670
[c000001bd1aaf8d0] c000000000157280 .do_writepages+0x40/0x90
[c000001bd1aaf940] c0000000001ea830 .writeback_single_inode+0xe0/0x530
[c000001bd1aafa00] c0000000001eb680 .writeback_sb_inodes+0x210/0x300
[c000001bd1aafb20] c0000000001ebc84 .__writeback_inodes_wb+0xd4/0x140
[c000001bd1aafbe0] c0000000001ebfec .wb_writeback+0x2fc/0x3e0
[c000001bd1aafce0] c0000000001ed770 .wb_do_writeback+0x2f0/0x300
[c000001bd1aafdf0] c0000000001ed848 .bdi_writeback_thread+0xc8/0x340
[c000001bd1aafed0] c0000000000c5494 .kthread+0xb4/0xc0
[c000001bd1aaff90] c000000000021f48 .kernel_thread+0x54/0x70
This is due to getting ext_depth(inode) == 0x101 and therefore running
off the end of the path array in ext4_ext_drop_refs into following
unallocated structures.
This fixes it by adding the necessary le16_to_cpu.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
We need to make sure iocb->private is cleared *before* we put the
io_end structure on i_completed_io_list. Otherwise fsync() could
potentially run on another CPU and free the iocb structure out from
under us.
Reported-by: Kent Overstreet <koverstreet@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
This patch adds the amd_iommu_init_device() and
amd_iommu_free_device() functions which make a device and
the IOMMU ready for IOMMUv2 usage.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Add a Kconfig option for the optional driver. Since it is
optional it can be compiled as a module and will only be
loaded when required by another driver.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
The AMD IOMMUv2 driver needs to get the IOMMUv2 domain
associated with a particular device. This patch adds a
function to get this information.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
To send completions for PPR requests this patch adds a
function which can be used by the IOMMUv2 driver.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This patch adds functions necessary to set and clear the
GCR3 values associated with a particular PASID in an IOMMUv2
domain.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
The functions added with this patch allow to manage the
IOMMU and the device TLBs for all devices in an IOMMUv2
domain.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Make FRV use the generic settings to be found in asm-generic/param.h where
possible rather than defining its own as they're mostly exactly the same.
This sorts out a problem with HZ being redefined after the UAPI split.
Signed-off-by: David Howells <dhowells@redhat.com>
Make M32R use the generic settings to be found in asm-generic/param.h rather
than defining its own as they're exactly the same.
This sorts out a problem with HZ being redefined after the splitting of
userspace headers from kernel headers.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Hirokazu Takata <takata@linux-m32r.org>
cc: linux-m32r@ml.linux-m32r.org
This function can be used to switch a domain into
paging-mode 0. In this mode all devices can access physical
system memory directly without any remapping.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
If the device starts to use IOMMUv2 features the dma handles
need to stay valid. The only sane way to do this is to use a
identity mapping for the device and not translate it by the
iommu. This is implemented with this patch. Since this lifts
the device-isolation there is also a new kernel parameter
which allows to disable that feature.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
In mixed IOMMU setups this flag inidicates whether an IOMMU
supports the v2 features or not. This patch also adds a
global flag together with a function to query that flag from
other code. The flag shows if at least one IOMMUv2 is in the
system.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Make MN10300 use the generic settings to be found in asm-generic/param.h
rather than defining its own as they're exactly the same.
This sorts out a problem with HZ being redefined after the UAPI split.
Signed-off-by: David Howells <dhowells@redhat.com>
elf_read_implies_exec() is a kernel-only feature as the second parameter is a
constant that isn't exported to userspace. Not only that, but the
arch-specific overrides are not exported either.
So hide the macro from userspace.
Similarly, struct file should not be predeclared in userspace.
Signed-off-by: David Howells <dhowells@redhat.com>
Don't include linux/compat.h in sparc's asm/siginfo.h as it leads to a circular
dependency:
asm/siginfo.h -> linux/compat.h -> asm/siginfo.h
Signed-off-by: David Howells <dhowells@redhat.com>
cc: David S. Miller <davem@davemloft.net>
cc: sparclinux@vger.kernel.org
Read the number of PASIDs supported by each IOMMU in the
system and take the smallest number as the maximum value
supported by the IOMMU driver.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Convert the contents of 'struct dev_table_entry' to u64 to
allow updating the DTE wit 64bit writes as required by the
spec.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Fix arch/mips/include/asm/Kbuild to have a separate header-y line for each
header to make them easier to relocate individually as part of the UAPI header
split.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
The old PowerMac swim3 driver has some "interesting" locking issues,
using a private lock and failing to lock the queue before completing
requests, which triggered WARN_ONs among others.
This rips out the private lock, makes everything operate under the
block queue lock, and generally makes things simpler.
We used to also share a queue between the two possible instances which
was problematic since we might pick the wrong controller in some cases,
so make the queue and the current request per-instance and use
queuedata to point to our private data which is a lot cleaner.
We still share the queue lock but then, it's nearly impossible to actually
use 2 swim3's simultaneously: one would need to have a Wallstreet
PowerBook, the only machine afaik with two of these on the motherboard,
and populate both hotswap bays with a floppy drive (the machine ships
only with one), so nobody cares...
While at it, add a little fix to clear up stale interrupts when loading
the driver or plugging a floppy drive in a bay.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
With the auto-parser we can choose the dac nid for vmaster from
the DACs we already know, instead of hard-coding it. This is more
future-proof and was actually wrong on one machine.
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Don't write more than the requested number of bytes of an batman-adv icmp
packet to the userspace buffer. Otherwise unrelated userspace memory might get
overridden by the kernel.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
The access_ok read check can be directly done in copy_from_user since a failure
of access_ok is handled the same way as an error in __copy_from_user.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Writing a icmp_packet_rr and then reading icmp_packet can lead to kernel
memory corruption, if __user *buf is just below TASK_SIZE.
Signed-off-by: Paul Kot <pawlkt@gmail.com>
[sven@narfation.org: made it checkpatch clean]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
fix the following compile warning:
drivers/usb/musb/omap2430.c: In function 'musb_otg_notifier_work':
drivers/usb/musb/omap2430.c:279:3: warning: 'return' with a value, in
function returning void
drivers/usb/musb/omap2430.c:282:2: warning: 'return' with a value, in
function returning void
Signed-off-by: Felipe Balbi <balbi@ti.com>
It's the counterpart of perf_session__parse_sample.
v2: fixed mistakes found by David Ahern.
v3: s/data/sample/
s/perf_event__change_sample/perf_event__synthesize_sample
Reviewed-by: David Ahern <dsahern@gmail.com>
Cc: Arun Sharma <asharma@fb.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: devel@openvz.org
Link: http://lkml.kernel.org/r/1323266161-394927-3-git-send-email-avagin@openvz.org
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
The option is documented in man perf-script but was not yet implemented:
-a
Force system-wide collection. Scripts run without a
<command> normally use -a by default, while scripts run
with a <command> normally don't - this option allows the
latter to be run in system-wide mode.
As with perf record you now can profile in system-wide mode for the
runtime of a given command, e.g.:
# perf script -a syscall-counts sleep 2
Cc: Ingo Molnar <mingo@elte.hu>
Link: http://lkml.kernel.org/r/1322229925-10075-1-git-send-email-robert.richter@amd.com
Signed-off-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Fix mem leaks and missing NULL pointer checks after strdup().
And get_script_path() did not free __script_root in case of continue.
Introduce a helper function get_script_root().
Cc: Ingo Molnar <mingo@elte.hu>
Link: http://lkml.kernel.org/r/1322217520-3287-1-git-send-email-robert.richter@amd.com
Signed-off-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
usbhsh_ureq_free() is not enough when urb dequeued.
Without this patch, the driver can not recognize re-connected
USB device after USB hub disconnected
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
usbhsh_urb_enqueue() didn't have error value when
usbhsh_device_attach() failed
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Low/Full speed device is not recognized without this patch
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Release superspeed mass storage descriptors memory
when the function is unbind.
Signed-off-by: Yu Xu <yuxu@marvell.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This driver can be built as module and the file header indicates that
the driver is published under the GPL.
Thus add MODULE_LICENSE("GPL") for it.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
[jejb: checkpatch fixes]
Add more fine grain parsing of vha->loop_state to export a more accurate
fc_host port_state.
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
musb pm_runtime_get_sync call happens in intrrupt context on cable attach case
That can result in re-enabling the interrupts and cause side affects.
So move the code to a work queue.
Following is the error path hit on cable attach:
BUG: sleeping function called from invalid context at drivers/base/power/runtime.c:802
in_atomic(): 0, irqs_disabled(): 0, pid: 18, name: irq/378-twl6030
Backtrace:
[<c00520f0>] (dump_backtrace+0x0/0x110) from [<c054f454>] (dump_stack+0x18/0x1c)
[<c054f43c>] (dump_stack+0x0/0x1c) from [<c007f59c>] (__might_sleep+0x130/0x134)
[<c007f46c>] (__might_sleep+0x0/0x134) from [<c02c2794>] (__pm_runtime_resume+0x94/0x98)
[<c02c2700>] (__pm_runtime_resume+0x0/0x98) from [<c033e7e4>] (musb_otg_notifications+0x9c/0x164)
[<c033e748>] (musb_otg_notifications+0x0/0x164) from [<c00b3df0>] (notifier_call_chain+0x4c/0x8c)
[<c00b3da4>] (notifier_call_chain+0x0/0x8c) from [<c00b44a8>] (__atomic_notifier_call_chain+0x40/0x54)
[<c00b4468>] (__atomic_notifier_call_chain+0x0/0x54) from [<c00b44dc>] (atomic_notifier_call_chain+0x20/0x28)
[<c00b44bc>] (atomic_notifier_call_chain+0x0/0x28) from [<c033f124>] (twl6030_usb_irq+0xc8/0xdc)
[<c033f05c>] (twl6030_usb_irq+0x0/0xdc) from [<c00d79f8>] (irq_thread_fn+0x24/0x40)
[<c00d79d4>] (irq_thread_fn+0x0/0x40) from [<c00d7b64>] (irq_thread+0x150/0x1d8)
[<c00d7a14>] (irq_thread+0x0/0x1d8) from [<c00adf70>] (kthread+0x94/0x98)
[<c00adedc>] (kthread+0x0/0x98) from [<c0094388>] (do_exit+0x0/0x720)
Tested with:
MUSB Device mode: Cold boot / Hot plug
MUSB Host mode: Cold boot / Hot plug
Signed-off-by: Vikram Pandita <vikram.pandita@ti.com>
Signed-off-by: Moiz Sonasath <m-sonasath@ti.com>
Signed-off-by: Vikram Pandita <vikram.pandita@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
