Daniel Vetter e5eb3d63c6 drm/i915: add interface to simulate gpu hangs ... gpu reset is a very important piece of our infrastructure. Unfortunately we only really it test by actually hanging the gpu, which often has bad side-effects for the entire system. And the gpu hang handling code is one of the rather complicated pieces of code we have, consisting of - hang detection - error capture - actual gpu reset - reset of all the gem bookkeeping - reinitialition of the entire gpu This patch adds a debugfs to selectively stopping rings by ceasing to update the hw tail pointer, which will result in the gpu no longer updating it's head pointer and eventually to the hangcheck firing. This way we can exercise the gpu hang code under controlled conditions without a dying gpu taking down the entire systems. Patch motivated by me forgetting to properly reinitialize ppgtt after a gpu reset. Usage: echo $((1 << $ringnum)) > i915_ring_stop # stops one ring echo 0xffffffff > i915_ring_stop # stops all, future-proof version then run whatever testload is desired. i915_ring_stop automatically resets after a gpu hang is detected to avoid hanging the gpu to fast and declaring it wedged. v2: Incorporate feedback from Chris Wilson. v3: Add the missing cleanup. v4: Fix up inconsistent size of ring_stop_read vs _write, noticed by Eugeni Dodonov. Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com> Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>		2012-05-05 19:45:00 +02:00
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accessibility
acpi	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux	2012-04-06 19:56:04 -07:00
amba	ARM: 7366/3: amba: Remove AMBA level regulator support	2012-04-13 14:04:08 +01:00
ata	1) AHCI regression fix. A recent "make driver conform to spec" change	2012-03-22 20:22:30 -07:00
atm	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
auxdisplay
base	drivers/base: fix compiler warning in SoC export driver - idr should be ida	2012-04-09 14:54:22 -07:00
bcma	bcma: fix build error on MIPS; implicit pcibios_enable_device	2012-04-10 14:13:30 -04:00
block	Merge branch 'for-3.4/drivers' of git://git.kernel.dk/linux-block	2012-04-13 18:45:13 -07:00
bluetooth	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth	2012-04-09 15:47:49 -04:00
cdrom
char	Merge tag 'drm-intel-next-2012-04-23' of git://people.freedesktop.org/~danvet/drm-intel into drm-core-next	2012-05-02 09:22:29 +01:00
clk
clocksource	Revert "clocksource: Load the ACPI PM clocksource asynchronously"	2012-04-12 00:05:05 +02:00
connector
cpufreq	cpufreq: OMAP: fix build errors: depends on ARCH_OMAP2PLUS	2012-04-13 17:57:40 -07:00
cpuidle	Merge branches 'idle-fix' and 'misc' into release	2012-04-06 21:48:59 -04:00
crypto	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux	2012-03-22 18:15:32 -07:00
dca
devfreq	ARM: global cleanups	2012-03-27 16:03:32 -07:00
dio
dma	dmaengine-fixes for 3.4-rc3	2012-04-10 15:30:16 -07:00
edac	Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile	2012-04-06 17:56:20 -07:00
eisa
firewire	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
firmware
gpio	gpio/exynos: Fix compiler warning in gpio-samsung.c file	2012-04-10 22:15:39 -06:00
gpu	drm/i915: add interface to simulate gpu hangs	2012-05-05 19:45:00 +02:00
hid	simple_open: automatically convert to simple_open()	2012-04-05 15:25:50 -07:00
hsi
hv
hwmon	hwmon: (pmbus_core) Fix compiler warning	2012-04-09 12:17:38 -07:00
hwspinlock
i2c	i2c: prevent spurious interrupt on Designware controllers	2012-04-10 08:09:03 -07:00
ide	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
idle	simple_open: automatically convert to simple_open()	2012-04-05 15:25:50 -07:00
ieee802154
infiniband	Add a fix for a bug hit by Alexey Shvetsov in ib_srtp that hits on	2012-04-12 18:51:32 -07:00
input	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2012-04-12 12:49:07 -07:00
iommu	Merge branch 'akpm' (Andrew's patch-bomb)	2012-04-05 15:30:34 -07:00
isdn	tty and serial fixes for 3.4-rc2	2012-04-12 15:36:33 -07:00
leds	MFD changes for 3.4	2012-03-28 13:56:35 -07:00
lguest
macintosh	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
mca
md	md/bitmap: prevent bitmap_daemon_work running while initialising bitmap	2012-04-12 16:05:06 +10:00
media	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-04-11 11:05:34 -07:00
memstick
message	Disintegrate and delete asm/system.h	2012-03-28 15:58:21 -07:00
mfd	ARM: 7366/3: amba: Remove AMBA level regulator support	2012-04-13 14:04:08 +01:00
misc	Merge branch 'akpm' (Andrew's patch-bomb)	2012-04-05 15:30:34 -07:00
mmc	mmc: use really long write timeout to deal with crappy cards	2012-04-05 20:32:34 -04:00
mtd	fix breakage in mtdchar_open(), sanitize failure exits	2012-04-09 01:38:55 -04:00
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-04-12 14:04:33 -07:00
nfc
nubus	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
of	gpio: Fix range check in of_gpio_simple_xlate()	2012-04-10 14:20:56 -06:00
oprofile	simple_open: automatically convert to simple_open()	2012-04-05 15:25:50 -07:00
parisc	Disintegrate and delete asm/system.h	2012-03-28 15:58:21 -07:00
parport
pci	Merge tag 'drm-intel-next-2012-04-23' of git://people.freedesktop.org/~danvet/drm-intel into drm-core-next	2012-05-02 09:22:29 +01:00
pcmcia	Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia	2012-03-29 16:00:48 -07:00
pinctrl
platform	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux	2012-03-30 16:45:39 -07:00
pnp	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux	2012-03-30 16:45:39 -07:00
power	Various small bugfixes and enhancements, plus two new drivers:	2012-03-30 16:09:02 -07:00
pps
ps3
ptp
rapidio
regulator	regulator: Fix a build warning in the anatop driver for 3.4	2012-04-10 10:26:41 -07:00
remoteproc	simple_open: automatically convert to simple_open()	2012-04-05 15:25:50 -07:00
rpmsg
rtc	drivers/rtc/rtc-pl031.c: enable clock on all ST variants	2012-04-12 13:12:12 -07:00
s390	Disintegrate and delete asm/system.h	2012-03-28 15:58:21 -07:00
sbus	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
scsi	SCSI: Fix error handling when no ULD is attached	2012-04-15 11:08:53 -07:00
sfi
sh	SuperH updates for 3.4 merge window	2012-03-30 00:09:17 -07:00
sn
spi	Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm	2012-04-15 17:35:19 -07:00
ssb
staging	Staging tree fixes for 3.4-rc2	2012-04-12 15:35:12 -07:00
target	tcm_fc: Do not free tpg structure during wq allocation failure	2012-04-06 18:57:05 -07:00
tc
thermal
tty	tty and serial fixes for 3.4-rc2	2012-04-12 15:36:33 -07:00
uio
usb	xHCI: Correct the #define XHCI_LEGACY_DISABLE_SMI	2012-04-11 08:31:06 -07:00
uwb	simple_open: automatically convert to simple_open()	2012-04-05 15:25:50 -07:00
vhost	Merge branch 'vhost-net' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost	2012-03-23 14:46:48 -04:00
video	Merge tag 'drm-intel-next-2012-04-23' of git://people.freedesktop.org/~danvet/drm-intel into drm-core-next	2012-05-02 09:22:29 +01:00
virt
virtio	virtio-pci: switch to PM ops macro to initialise PM functions	2012-03-31 08:09:51 +05:30
vlynq
w1
watchdog	ARM: cleanups of io includes	2012-03-29 18:02:10 -07:00
xen	Two fixes for regressions:	2012-04-06 17:54:53 -07:00
zorro
Kconfig	Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi	2012-04-02 09:50:40 -07:00
Makefile	Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi	2012-04-02 09:50:40 -07:00