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Drivers without a hardware vblank counter simply can't account for the
vblanks that happened while the vblank interrupt was off. To check
this grab a vblank timestamp and if the result is dubious follow the
normal save-and-disable logic.
Drivers should prevent this by setting vblank_disable_allowed = false,
but since running vblank interrupts constantly is not good for power
consumption most drivers lie. Testing for precise vblank timestamps is
the next best thing we can check for.
Suggested-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Cc: Mario Kleiner <mario.kleiner.de@gmail.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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With the new support for immediate vblank disabling we always disabled
the vblank interrupt right away, irrespective of the vblank offdelay
setting.
But being able to let vblanks run forever is fairly useful for
debugging, so restore that behaviour.
Suggested-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Cc: Mario Kleiner <mario.kleiner.de@gmail.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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drm-next
1) add LVDS support for mdp4 (tested with auo B101XTN01.0 panel)
2) add B101XTN01.0 panel
3) bit of gpu refactoring to prepare for addition of addition gpu
generations beyond just a3xx
* 'msm-next' of git://people.freedesktop.org/~robclark/linux:
drm/msm/adreno: push dump/show stuff to base class
drm/msm/adreno: bit of init refactoring
drm/msm/adreno: move decision about what gpu to to load
drm/msm/adreno: split adreno device out into it's own file
drm/panel/simple: add optronics B101XTN01.0 (v3)
drm/msm/mdp4: add LVDS panel support
drm/msm/mdp4: fix blend setup with multiple crtcs
drm/msm: update generated headers
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git://people.freedesktop.org/~robclark/linux into drm-fixes
A couple more little fixes:
1) fix from llvm/clang folks
2) fix build if common clock framework is not used
3) if vram carveout is used, have default size for vram carveout
* 'msm-fixes-3.17-rc4' of git://people.freedesktop.org/~robclark/linux:
drm/msm: don't crash if no msm.vram param
drm/msm/hdmi: fix build break on non-CCF platforms
drm/msm: Change nested function to static function
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If VRAM carveout is used, due to no IOMMU, we should have a default
value for msm.vram so that we don't simply crash.
Reported-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
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Reported-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Rob Clark <robdclark@gmail.com>
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There is currently a nested function in Russel King's tree
for the msm HDMI driver.
The last nested function was removed from the Linux kernel
when the Thinkpad driver was fixed.
I believe nested functions are not desired upstream, and it
also breaks compilation with clang so here is a patch to
change the nested function into static function. The patch
works with both clang and gcc.
Signed-off-by: Mark Charlebois <charlebm@gmail.com>
Signed-off-by: Rob Clark <robdclark@gmail.com>
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git://anongit.freedesktop.org/drm-intel into drm-fixes
more fixes for 3.17, almost all Cc: stable material.
* tag 'drm-intel-fixes-2014-09-10' of git://anongit.freedesktop.org/drm-intel:
drm/i915: Wait for vblank before enabling the TV encoder
drm/i915: Evict CS TLBs between batches
drm/i915: Fix irq enable tracking in driver load
drm/i915: Fix EIO/wedged handling in gem fault handler
drm/i915: Prevent recursive deadlock on releasing a busy userptr
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into drm-fixes
Just a few fixes for radeon for 3.17.
* 'drm-fixes-3.17' of git://people.freedesktop.org/~agd5f/linux:
drm/radeon/dpm: set the thermal type properly for special configs
drm/radeon: reduce memory footprint for debugging
drm/radeon: add connector quirk for fujitsu board
drm/radeon: fix semaphore value init
drm/radeon: only use me/pfp sync on evergreen+
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into drm-next
A few more radeon patches for 3.18. This patch set gives us more
flexibility with respect to buffer placement in vram with respect
to CPU access. E.g., if you know you will not need CPU access, we can
now pin outside of the CPU window, reducing contention for the
CPU window space.
* 'drm-next-3.18' of git://people.freedesktop.org/~agd5f/linux:
drm/radeon: add RADEON_GEM_NO_CPU_ACCESS BO creation flag (v4)
drm/radeon: Clean up assignment of TTM placement lpfn member for pinning
drm/radeon: Add RADEON_GEM_CPU_ACCESS BO creation flag
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We need to make sure to deqeueue the descriptor from the active list before
we call vchan_cookie_complete(). Also we need obviously only set chan->desc
to NULL after we stopped using it.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Initialize USB PHY after every Link controller reset
Cc: 3.16+ <stable@vger.kernel.org>
Cc: Tim Bird <tbird20d@gmail.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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PHY drivers keep track of the current state of the hardware,
so don't change PHY settings under it.
Cc: 3.16+ <stable@vger.kernel.org>
Cc: Tim Bird <tbird20d@gmail.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge misc fixes from Andrew Morton:
"10 fixes"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
fs/notify: don't show f_handle if exportfs_encode_inode_fh failed
fsnotify/fdinfo: use named constants instead of hardcoded values
kcmp: fix standard comparison bug
mm/mmap.c: use pr_emerg when printing BUG related information
shm: add memfd.h to UAPI export list
checkpatch: allow commit descriptions on separate line from commit id
sh: get_user_pages_fast() must flush cache
eventpoll: fix uninitialized variable in epoll_ctl
kernel/printk/printk.c: fix faulty logic in the case of recursive printk
mem-hotplug: let memblock skip the hotpluggable memory regions in __next_mem_range()
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Currently we handle only ENOSPC. In case of other errors the file_handle
variable isn't filled properly and we will show a part of stack.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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MAX_HANDLE_SZ is equal to 128, but currently the size of pad is only 64
bytes, so exportfs_encode_inode_fh can return an error.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The C operator <= defines a perfectly fine total ordering on the set of
values representable in a long. However, unlike its namesake in the
integers, it is not translation invariant, meaning that we do not have
"b <= c" iff "a+b <= a+c" for all a,b,c.
This means that it is always wrong to try to boil down the relationship
between two longs to a question about the sign of their difference,
because the resulting relation [a LEQ b iff a-b <= 0] is neither
anti-symmetric or transitive. The former is due to -LONG_MIN==LONG_MIN
(take any two a,b with a-b = LONG_MIN; then a LEQ b and b LEQ a, but a !=
b). The latter can either be seen observing that x LEQ x+1 for all x,
implying x LEQ x+1 LEQ x+2 ... LEQ x-1 LEQ x; or more directly with the
simple example a=LONG_MIN, b=0, c=1, for which a-b < 0, b-c < 0, but a-c >
0.
Note that it makes absolutely no difference that a transmogrying bijection
has been applied before the comparison is done. In fact, had the
obfuscation not been done, one could probably not observe the bug
(assuming all values being compared always lie in one half of the address
space, the mathematical value of a-b is always representable in a long).
As it stands, one can easily obtain three file descriptors exhibiting the
non-transitivity of kcmp().
Side note 1: I can't see that ensuring the MSB of the multiplier is
set serves any purpose other than obfuscating the obfuscating code.
Side note 2:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#include <sys/syscall.h>
enum kcmp_type {
KCMP_FILE,
KCMP_VM,
KCMP_FILES,
KCMP_FS,
KCMP_SIGHAND,
KCMP_IO,
KCMP_SYSVSEM,
KCMP_TYPES,
};
pid_t pid;
int kcmp(pid_t pid1, pid_t pid2, int type,
unsigned long idx1, unsigned long idx2)
{
return syscall(SYS_kcmp, pid1, pid2, type, idx1, idx2);
}
int cmp_fd(int fd1, int fd2)
{
int c = kcmp(pid, pid, KCMP_FILE, fd1, fd2);
if (c < 0) {
perror("kcmp");
exit(1);
}
assert(0 <= c && c < 3);
return c;
}
int cmp_fdp(const void *a, const void *b)
{
static const int normalize[] = {0, -1, 1};
return normalize[cmp_fd(*(int*)a, *(int*)b)];
}
#define MAX 100 /* This is plenty; I've seen it trigger for MAX==3 */
int main(int argc, char *argv[])
{
int r, s, count = 0;
int REL[3] = {0,0,0};
int fd[MAX];
pid = getpid();
while (count < MAX) {
r = open("/dev/null", O_RDONLY);
if (r < 0)
break;
fd[count++] = r;
}
printf("opened %d file descriptors\n", count);
for (r = 0; r < count; ++r) {
for (s = r+1; s < count; ++s) {
REL[cmp_fd(fd[r], fd[s])]++;
}
}
printf("== %d\t< %d\t> %d\n", REL[0], REL[1], REL[2]);
qsort(fd, count, sizeof(fd[0]), cmp_fdp);
memset(REL, 0, sizeof(REL));
for (r = 0; r < count; ++r) {
for (s = r+1; s < count; ++s) {
REL[cmp_fd(fd[r], fd[s])]++;
}
}
printf("== %d\t< %d\t> %d\n", REL[0], REL[1], REL[2]);
return (REL[0] + REL[2] != 0);
}
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
"Eric W. Biederman" <ebiederm@xmission.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Make sure we actually see the output of validate_mm() and browse_rb()
before triggering a BUG(). pr_info isn't shown by default so the reason
for the BUG() isn't obvious.
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The new header file memfd.h from commit 9183df25fe7b ("shm: add
memfd_create() syscall") should be exported.
Signed-off-by: David Drysdale <drysdale@google.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The general form for commit id and description is
'Commit <12+hexdigits> ("commit description/subject line")'
but commit logs often have relatively long commit ids and the commit
description emds on the next line like:
Some explanation as to why commit <12+hexdigits>
("commit foo description/subject line") is improved.
Allow this form.
Signed-off-by: Joe Perches <joe@perches.com>
Suggested-by: Joe Lawrence <joe.lawrence@stratus.com>
Tested-by: Joe Lawrence <joe.lawrence@stratus.com>
Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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This patch avoids fuse hangs on sh4 by flushing the cache on
get_user_pages_fast(). This is not necessary a good thing to do, but
get_user_pages() does this, so get_user_pages_fast() should too.
Please note the patch for mips arch that addresses the similar problem:
https://kernel.googlesource.com/pub/scm/linux/kernel/git/ralf/linux/+/linux-3.4.50%5E!/#F0
They basically simply disable get_user_pages_fast() at all, using a
fall-back to get_user_pages(). But my fix is different, it adds an
explicit cache flushes.
Signed-off-by: Stas Sergeev <stsp@users.sourceforge.net>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Kamal Dasu <kdasu.kdev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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When calling epoll_ctl with operation EPOLL_CTL_DEL, structure epds is
not initialized but ep_take_care_of_epollwakeup reads its event field.
When this unintialized field has EPOLLWAKEUP bit set, a capability check
is done for CAP_BLOCK_SUSPEND in ep_take_care_of_epollwakeup. This
produces unexpected messages in the audit log, such as (on a system
running SELinux):
type=AVC msg=audit(1408212798.866:410): avc: denied
{ block_suspend } for pid=7754 comm="dbus-daemon" capability=36
scontext=unconfined_u:unconfined_r:unconfined_t
tcontext=unconfined_u:unconfined_r:unconfined_t
tclass=capability2 permissive=1
type=SYSCALL msg=audit(1408212798.866:410): arch=c000003e syscall=233
success=yes exit=0 a0=3 a1=2 a2=9 a3=7fffd4d66ec0 items=0 ppid=1
pid=7754 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0
fsgid=0 tty=(none) ses=3 comm="dbus-daemon"
exe="/usr/bin/dbus-daemon"
subj=unconfined_u:unconfined_r:unconfined_t key=(null)
("arch=c000003e syscall=233 a1=2" means "epoll_ctl(op=EPOLL_CTL_DEL)")
Remove use of epds in epoll_ctl when op == EPOLL_CTL_DEL.
Fixes: 4d7e30d98939 ("epoll: Add a flag, EPOLLWAKEUP, to prevent suspend while epoll events are ready")
Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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We shouldn't set text_len in the code path that detects printk recursion
because text_len corresponds to the length of the string inside textbuf.
A few lines down from the line
text_len = strlen(recursion_msg);
is the line
text_len += vscnprintf(text + text_len, ...);
So if printk detects recursion, it sets text_len to 29 (the length of
recursion_msg) and logs an error. Then the message supplied by the
caller of printk is stored inside textbuf but offset by 29 bytes. This
means that the output of the recursive call to printk will contain 29
bytes of garbage in front of it.
This defect is caused by commit 458df9fd4815 ("printk: remove separate
printk_sched buffers and use printk buf instead") which turned the line
text_len = vscnprintf(text, ...);
into
text_len += vscnprintf(text + text_len, ...);
To fix this, this patch avoids setting text_len when logging the printk
recursion error. This patch also marks unlikely() the branch leading up
to this code.
Fixes: 458df9fd4815b478 ("printk: remove separate printk_sched buffers and use printk buf instead")
Signed-off-by: Patrick Palka <patrick@parcs.ath.cx>
Reviewed-by: Petr Mladek <pmladek@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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__next_mem_range()
Let memblock skip the hotpluggable memory regions in __next_mem_range(),
it is used to to prevent memblock from allocating hotpluggable memory
for the kernel at early time. The code is the same as __next_mem_range_rev().
Clear hotpluggable flag before releasing free pages to the buddy
allocator. If we don't clear hotpluggable flag in
free_low_memory_core_early(), the memory which marked hotpluggable flag
will not free to buddy allocator. Because __next_mem_range() will skip
them.
free_low_memory_core_early
for_each_free_mem_range
for_each_mem_range
__next_mem_range
[akpm@linux-foundation.org: fix warning]
Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
Pull UDF fixes from Jan Kara:
"Fixes for UDF handling of NFS handles and one fix for proper handling
of corrupted media"
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
udf: saner calling conventions for udf_new_inode()
udf: fix the udf_iget() vs. udf_new_inode() races
udf: merge the pieces inserting a new non-directory object into directory
udf: Set i_generation field
udf: Properly detect stale inodes
udf: Make udf_read_inode() and udf_iget() return error
udf: Avoid infinite loop when processing indirect ICBs
udf: Fold udf_fill_inode() into __udf_read_inode()
udf: Avoid dir link count to go negative
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During surprise device hotplug removal tests, it was observed that
hub_events may try to call usb_lock_device on a device that has already
been freed. Protect the usb_device by taking out a reference (under the
hub_event_lock) when hub_events pulls it off the list, returning the
reference after hub_events is finished using it.
Signed-off-by: Joe Lawrence <joe.lawrence@stratus.com>
Suggested-by: David Bulkow <david.bulkow@stratus.com> for using kref
Suggested-by: Alan Stern <stern@rowland.harvard.edu> for placement
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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There are a large numbers of issues with ASM1051 devices in uas mode:
1) They do not support REPORT SUPPORTED OPERATION CODES
2) They use out of spec 8 byte status iu-s when they have no sense data,
switching to normal 16 byte status iu-s when they do have sense data.
3) They hang / crash when combined with some disks, e.g. a Crucial M500 ssd.
4) They hang / crash when stressed (through e.g. sg_reset --bus) with disks
with which then normally do work (once 1 & 2 are worked around).
Where as in BOT mode they appear to work fine, so the best way forward with
these devices is to just blacklist them for uas usage.
Unfortunately this is easier said then done. as older versions of the ASM1053
(which works fine) use the same usb-id as the ASM1051.
When connected over USB-3 the 2 can be told apart by the number of streams
they support. So this patch adds some less then pretty code to disable uas for
the ASM1051. When connected over USB-2, simply disable uas alltogether for
devices with the shared usb-id.
Cc: stable@vger.kernel.org # 3.16
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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filelayout_retry_commit was recently split out from alloc_ds_commits,
but was done in such a way that the bucket pointer always starts at
index 0 no matter what the @idx argument is set to.
The intention of the @idx argument is to retry commits starting at
bucket @idx. This is called when alloc_ds_commits fails for a bucket.
Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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When running a 32-bit inputattach utility in a 64-bit system, there will be
error code "inputattach: can't set device type". This is caused by the
serport device driver not supporting compat_ioctl, so that SPIOCSTYPE ioctl
fails.
Cc: stable@vger.kernel.org
Signed-off-by: John Sung <penmount.touch@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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[Nick Dyer: reworked to move free of input device into separate function
and only call in paths that require it.]
Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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We hard code cephx auth ticket buffer size to 256 bytes. This isn't
enough for any moderate setups and, in case tickets themselves are not
encrypted, leads to buffer overflows (ceph_x_decrypt() errors out, but
ceph_decode_copy() doesn't - it's just a memcpy() wrapper). Since the
buffer is allocated dynamically anyway, allocated it a bit later, at
the point where we know how much is going to be needed.
Fixes: http://tracker.ceph.com/issues/8979
Cc: stable@vger.kernel.org
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@redhat.com>
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Add a helper for processing individual cephx auth tickets. Needed for
the next commit, which deals with allocating ticket buffers. (Most of
the diff here is whitespace - view with git diff -b).
Cc: stable@vger.kernel.org
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@redhat.com>
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We preallocate a few of the message types we get back from the mon. If we
get a larger message than we are expecting, fall back to trying to allocate
a new one instead of blindly using the one we have.
CC: stable@vger.kernel.org
Signed-off-by: Sage Weil <sage@redhat.com>
Reviewed-by: Ilya Dryomov <ilya.dryomov@inktank.com>
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Allows pinning of buffers in the non-CPU visible portion of
vram.
v2: incorporate Michel's comments.
v3: rebase on Michel's patch
v4: rebase on Michel's v2 patch
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
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This sets the lpfn member to 0 instead of the full domain size. TTM uses
the full domain size when lpfn is 0.
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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This flag is a hint that userspace expects the BO to be accessed by the
CPU. We can use that hint to prevent such BOs from ever being stored in
the CPU inaccessible part of VRAM.
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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When a writeback or a promotion of a block is completed, the cell of
that block is removed from the prison, the block is marked as clean, and
the clear_dirty() callback of the cache policy is called.
Unfortunately, performing those actions in this order allows an incoming
new write bio for that block to come in before clearing the dirty status
is completed and therefore possibly causing one of these two scenarios:
Scenario A:
Thread 1 Thread 2
cell_defer() .
- cell removed from prison .
- detained bios queued .
. incoming write bio
. remapped to cache
. set_dirty() called,
. but block already dirty
. => it does nothing
clear_dirty() .
- block marked clean .
- policy clear_dirty() called .
Result: Block is marked clean even though it is actually dirty. No
writeback will occur.
Scenario B:
Thread 1 Thread 2
cell_defer() .
- cell removed from prison .
- detained bios queued .
clear_dirty() .
- block marked clean .
. incoming write bio
. remapped to cache
. set_dirty() called
. - block marked dirty
. - policy set_dirty() called
- policy clear_dirty() called .
Result: Block is properly marked as dirty, but policy thinks it is clean
and therefore never asks us to writeback it.
This case is visible in "dmsetup status" dirty block count (which
normally decreases to 0 on a quiet device).
Fix these issues by calling clear_dirty() before calling cell_defer().
Incoming bios for that block will then be detained in the cell and
released only after clear_dirty() has completed, so the race will not
occur.
Found by inspecting the code after noticing spurious dirty counts
(scenario B).
Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
Acked-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
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Add ptr to list of interesting registers to 'struct adreno_gpu' and use
that to move most of the debugfs show and register dump bits down into
adreno_gpu. This will avoid duplication as support for additional
adreno generations is added.
Signed-off-by: Rob Clark <robdclark@gmail.com>
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Push a few bits down into adreno_gpu so they won't have to be duplicated
as support for additional adreno generations is added.
Signed-off-by: Rob Clark <robdclark@gmail.com>
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Move this into into adreno_device, and decide based on gpu revision
rather than just assuming a3xx.
Signed-off-by: Rob Clark <robdclark@gmail.com>
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We'd rather not duplicate these parts as support for additional gpu
generations is added.
Signed-off-by: Rob Clark <robdclark@gmail.com>
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LVDS panel, make/model described as:
AU Optronics Corporation - B101XTN01.0 (H/W:0A)
See:
http://www.encore-electronic.com/media/B101XTN01.0.pdf
Tested with panel attached to an Inforce IFC6410 board.
Signed-off-by: Rob Clark <robdclark@gmail.com>
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LVDS panel support uses the LCDC (parallel) encoder. Unlike with HDMI,
there is not a separate LVDS block, so no need to split things into a
bridge+connector. Nor is there is anything re-used with mdp5.
Note that there can be some regulators shared between HDMI and LVDS (in
particular, on apq8064, ext_3v3p), so we should not use the _exclusive()
variants of devm_regulator_get().
The drm_panel framework is used for panel-specific driver.
Signed-off-by: Rob Clark <robdclark@gmail.com>
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In particular, blend_setup() should not overwrite the other crtc's mixer
settings. Also, the encoder needs to be able to specify the mixer-id
explicitly, since both LVDS and DTV use 'INTF_LVDC_DTV', so we cannot
guess the mixer-id from the interface.
Signed-off-by: Rob Clark <robdclark@gmail.com>
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In particular, pick up the definitions for a handful of LVDS related
registers.
Signed-off-by: Rob Clark <robdclark@gmail.com>
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If we are running in a kdump environment, resources are scarce.
For some SCSI setups with a huge set of shared tags, we run out
of memory allocating what the drivers is asking for. So implement
a scale back logic to reduce the tag depth for those cases, allowing
the driver to successfully load.
We should extend this to detect low memory situations, and implement
a sane fallback for those (1 queue, 64 tags, or something like that).
Tested-by: Robert Elliott <elliott@hp.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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When RANDOMIZE_BASE (KASLR) is enabled; or the sum of all loaded
modules exceeds 512 MiB, then loading modules fails with a warning
(and hence a vmalloc allocation failure) because the PTEs for the
newly-allocated vmalloc address space are not zero.
WARNING: CPU: 0 PID: 494 at linux/mm/vmalloc.c:128
vmap_page_range_noflush+0x2a1/0x360()
This is caused by xen_setup_kernel_pagetables() copying
level2_kernel_pgt into level2_fixmap_pgt, overwriting many non-present
entries.
Without KASLR, the normal kernel image size only covers the first half
of level2_kernel_pgt and module space starts after that.
L4[511]->level3_kernel_pgt[510]->level2_kernel_pgt[ 0..255]->kernel
[256..511]->module
[511]->level2_fixmap_pgt[ 0..505]->module
This allows 512 MiB of of module vmalloc space to be used before
having to use the corrupted level2_fixmap_pgt entries.
With KASLR enabled, the kernel image uses the full PUD range of 1G and
module space starts in the level2_fixmap_pgt. So basically:
L4[511]->level3_kernel_pgt[510]->level2_kernel_pgt[0..511]->kernel
[511]->level2_fixmap_pgt[0..505]->module
And now no module vmalloc space can be used without using the corrupt
level2_fixmap_pgt entries.
Fix this by properly converting the level2_fixmap_pgt entries to MFNs,
and setting level1_fixmap_pgt as read-only.
A number of comments were also using the the wrong L3 offset for
level2_kernel_pgt. These have been corrected.
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: stable@vger.kernel.org
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I am leaving Samsung, so my current e-mail address is not going to work
any longer. Replace it with my private one. In addition, Sylwester
Nawrocki is being added as co-maintainer for Samsung clock drivers to
take some of the responsibilities, as I will be doing my part in my spare
time.
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Add the IRQCHIP_SKIP_SET_WAKE flag to baytrail gpio irq_chip
to resolve unbalaced IRQ wake disable warnings.
Suggested-by: Borun Fu <borun.fu@intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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IPUv3 preparations for capture support
* tag 'ipu-3.18' of git://git.pengutronix.de/git/pza/linux: (26 commits)
gpu: ipu-v3: Add ipu_dump()
gpu: ipu-cpmem: Add ipu_cpmem_dump()
gpu: ipu-v3: Add more planar formats support
gpu: ipu-cpmem: Add second buffer support to ipu_cpmem_set_image()
gpu: ipu-cpmem: Add ipu_cpmem_set_rotation()
gpu: ipu-cpmem: Add ipu_cpmem_set_axi_id()
gpu: ipu-cpmem: Add ipu_cpmem_set_block_mode()
gpu: ipu-v3: Add ipu_idmac_lock_enable()
gpu: ipu-v3: Add ipu_idmac_enable_watermark()
gpu: ipu-v3: Add ipu_stride_to_bytes()
gpu: ipu-v3: Add __ipu_idmac_reset_current_buffer()
gpu: ipu-v3: Add ipu_idmac_clear_buffer()
gpu: ipu-v3: Add ipu_idmac_buffer_is_ready()
gpu: ipu-v3: Move IDMAC channel names to imx-ipu-v3.h
gpu: ipu-v3: Add helper function checking if pixfmt is planar
gpu: ipu-v3: Add rotation mode conversion utilities
gpu: ipu-v3: Add ipu_mbus_code_to_colorspace()
gpu: ipu-v3: smfc: Add ipu_smfc_set_watermark()
gpu: ipu-v3: smfc: Convert to per-channel
gpu: ipu-v3: smfc: Move enable/disable to ipu-smfc.c
...
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