Chris Wilson
0f0cd47206
drm/i915: Only spin whilst waiting on the current request ...
Limit busywaiting only to the request currently being processed by the
GPU. If the request is not currently being processed by the GPU, there
is a very low likelihood of it being completed within the 2 microsecond
spin timeout and so we will just be wasting CPU cycles.
v2: Check for logical inversion when rebasing - we were incorrectly
checking for this request being active, and instead busywaiting for
when the GPU was not yet processing the request of interest.
v3: Try another colour for the seqno names.
v4: Another colour for the function names.
v5: Remove the forced coherency when checking for the active request. On
reflection and plenty of recent experimentation, the issue is not a
cache coherency problem - but an irq/seqno ordering problem (timing issue).
Here, we do not need the w/a to force ordering of the read with an
interrupt.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: "Rogozhkin, Dmitry V" <dmitry.v.rogozhkin@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Eero Tamminen <eero.t.tamminen@intel.com>
Cc: "Rantala, Valtteri" <valtteri.rantala@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1449833608-22125-4-git-send-email-chris@chris-wilson.co.uk
(cherry picked from commit 821485dc2a
2015-12-22 12:56:58 +02:00
nfit: acpi_nfit_notify(): Do not leave device locked
2015-12-11 14:24:26 -08:00
ata/sata_fsl.c: add ATA_FLAG_NO_LOG_PAGE to blacklist the controller for log page reads
2015-12-07 10:25:57 -05:00
Merge branches 'powercap', 'pm-cpufreq' and 'pm-domains'
2015-12-14 22:58:57 +01:00
xen: bug fixes for 4.4-rc5
2015-12-18 12:24:52 -08:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-11-10 18:11:41 -08:00
Merge branch 'x15-audio-fixes' into omap-for-v4.4/fixes
2015-11-12 09:58:21 -08:00
ipmi: move timer init to before irq is setup
2015-12-09 13:13:06 -06:00
ARM: SoC fixes for 4.4-rc
2015-12-12 16:43:44 -08:00
clocksource: Mmio: remove artificial 32bit limitation
2015-12-10 19:37:18 +01:00
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
Merge branches 'powercap', 'pm-cpufreq' and 'pm-domains'
2015-12-14 22:58:57 +01:00
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2015-12-05 10:46:44 -08:00
dmaengine: at_xdmac: fix at_xdmac_prep_dma_memcpy()
2015-12-10 09:48:01 +05:30
dma-buf/fence: add fence_wait_any_timeout function v2
2015-10-30 01:16:16 -04:00
asm-generic cleanups
2015-11-06 14:22:15 -08:00
IEEE 1394 subsystem patch:
2015-11-11 10:21:34 -08:00
ARM: SoC driver updates for v4.4
2015-11-10 15:00:03 -08:00
fpga manager: Fix firmware resource leak on error
2015-11-24 15:25:46 -08:00
gpio: revert get() to non-errorprogating behaviour
2015-12-17 15:48:29 +01:00
drm/i915: Only spin whilst waiting on the current request
2015-12-22 12:56:58 +02:00
USB fixes for 4.4-rc5
2015-12-13 11:58:18 -08:00
hsi: controllers:remove redundant code
2015-10-30 16:10:40 +01:00
drivers/hv: share Hyper-V SynIC constants with userspace
2015-11-04 16:24:33 +01:00
hwmon: (sht15) Select CONFIG_BITREVERSE
2015-12-18 08:19:52 -08:00
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
2015-11-13 20:04:17 -08:00
i2c: rcar: disable runtime PM correctly in slave mode
2015-12-19 12:00:37 +01:00
mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM
2015-11-06 17:50:42 -08:00
iio: adc: spmi-vadc: add missing of_node_put
2015-11-21 18:24:44 +00:00
IB/mlx5: Postpone remove_keys under knowledge of coming preemption
2015-12-08 16:55:31 -05:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2015-12-19 09:51:11 -08:00
IOMMU Fixes for Linux v4.4-rc5
2015-12-18 12:38:35 -08:00
irqchip/versatile-fpga: Fix PCI IRQ mapping on Versatile PB
2015-12-01 22:50:16 +01:00
ser_gigaset: remove unnecessary kfree() calls from release method
2015-12-15 13:24:21 -05:00
spi: Updates for v4.4
2015-11-05 13:15:12 -08:00
lightnvm: do not compile in debugging by default
2015-12-07 09:14:20 -07:00
mailbox: mailbox-test: avoid reading iomem twice
2015-11-04 14:03:04 +05:30
mcb: Destroy IDA on module unload
2015-10-29 09:02:16 +09:00
Fix remove_and_add_spares removes drive added as spare in slot_store
2015-12-18 15:19:16 +11:00
media fixes for v4.4-rc6
2015-12-18 15:41:35 -08:00
ARM: SoC driver updates for v4.4
2015-11-10 15:00:03 -08:00
SCSI queue for 4.4.
2015-11-12 07:06:18 -05:00
asm-generic cleanups
2015-11-06 14:22:15 -08:00
cxl: Set endianess of kernel contexts
2015-12-08 16:57:01 +11:00
mmc: remove bondage between REQ_META and reliable write
2015-11-09 14:04:52 +01:00
doc: dt: mtd: partitions: add compatible property to "partitions" node
2015-12-08 17:10:20 -08:00
xen: bug fixes for 4.4-rc5
2015-12-18 12:24:52 -08:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-11-10 18:11:41 -08:00
NTB: fix 32-bit compiler warning
2015-11-08 16:24:43 -05:00
libnvdimm, pmem: fix size trim in pmem_direct_access()
2015-11-12 09:55:23 -08:00
lightnvm: replace req queue with nvmdev for lld
2015-12-07 09:14:19 -07:00
of/irq: Export of_irq_find_parent again
2015-12-09 09:08:36 -06:00
parisc iommu: fix panic due to trying to allocate too large region
2015-12-12 16:07:25 +01:00
PCI updates for v4.4:
2015-12-09 09:26:06 -08:00
arm64 updates for 4.4:
2015-11-04 14:47:13 -08:00
phy: core: Get a refcount to phy in devm_of_phy_get_by_index()
2015-12-07 18:44:02 +05:30
pinctrl: bcm2835: Fix initial value for direction_output
2015-12-14 11:31:20 +01:00
platform/chrome: Branch for v4.4
2015-11-13 21:53:18 -08:00
- New Device Support
2015-11-06 10:23:50 -08:00
powercap / RAPL: fix BIOS lock check
2015-12-12 02:31:11 +01:00
pwm: Changes for v4.4-rc1
2015-11-11 09:16:10 -08:00
spi: Updates for v4.4
2015-11-05 13:15:12 -08:00
remoteproc: fix memory leak of remoteproc ida cache layers
2015-11-26 17:44:28 +02:00
rtc: da9063: fix access ordering error during RTC interrupt at system power on
2015-12-20 13:39:29 +01:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
2015-11-18 08:59:29 -08:00
Merge remote-tracking branch 'mkp-scsi/4.4/scsi-fixes' into fixes
2015-12-17 07:32:08 -08:00
drivers: sh: Get rid of CONFIG_ARCH_SHMOBILE_MULTI
2015-11-17 02:12:46 +09:00
Few Keystone fixes for 4.4-rcx
2015-11-25 23:48:12 +01:00
Merge remote-tracking branches 'spi/fix/dspi' and 'spi/fix/spidev' into spi-linus
2015-12-16 13:28:32 +00:00
char/misc drivers for 4.4-rc1
2015-11-04 22:15:15 -08:00
ssb: add Kconfig entry for compiling SoC related code
2015-10-28 21:05:21 +02:00
Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
2015-12-17 11:20:13 -08:00
target/stat: print full t10_wwn.model buffer
2015-11-28 21:23:13 -08:00
imx: thermal: use CPU temperature grade info for thresholds
2015-11-23 16:38:40 -08:00
tty: Fix GPF in flush_to_ldisc()
2015-12-12 23:05:28 -08:00
USB: fix invalid memory access in hub_activate()
2015-12-18 09:30:34 -08:00
driver core update for 4.4-rc1
2015-11-04 21:50:37 -08:00
Revert: "vfio: Include No-IOMMU mode"
2015-12-04 08:38:42 -07:00
vhost: replace % with & on data path
2015-12-07 17:28:10 +02:00
OMAPDSS: fix timings for VENC to match what omapdrm expects
2015-12-09 12:57:13 +02:00
virtio_ring: shadow available ring flags & index
2015-12-07 17:28:11 +02:00
char/misc drivers for 4.4-rc1
2015-11-04 22:15:15 -08:00
power supply and reset changes for the v4.4 series
2015-11-05 12:28:15 -08:00
watchdog: mtk_wdt: Use MODE_KEY when stopping the watchdog
2015-11-23 09:00:09 +01:00
xen: bug fixes for 4.4-rc5
2015-12-18 12:24:52 -08:00
char/misc drivers for 4.4-rc1
2015-11-04 22:15:15 -08:00
null_blk: register as a LightNVM device
2015-11-16 15:22:28 -07:00
0f0cd47206