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linux-hardened/drivers/gpu/drm
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Chris Wilson 91b0c352ac drm/i915: Break busywaiting for requests on pending signals 
The busywait in __i915_spin_request() does not respect pending signals
and so may consume the entire timeslice for the task instead of
returning to userspace to handle the signal.

In the worst case this could cause a delay in signal processing of 20ms,
which would be a noticeable jitter in cursor tracking. If a higher
resolution signal was being used, for example to provide fairness of a
server timeslices between clients, we could expect to detect some
unfairness between clients (i.e. some windows not updating as fast as
others). This issue was noticed when inspecting a report of poor
interactivity resulting from excessively high __i915_spin_request usage.

Fixes regression from
commit 2def4ad99b [v4.2]
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Tue Apr 7 16:20:41 2015 +0100

     drm/i915: Optimistically spin for the request completion

v2: Try to assess the impact of the bug

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Jens Axboe <axboe@kernel.dk>
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/1449833608-22125-2-git-send-email-chris@chris-wilson.co.uk
2015-12-18 17:11:47 +01:00
..
amd Linux 4.4-rc4 2015-12-08 11:04:26 +10:00
armada drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
ast drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
atmel-hlcdc drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
bochs drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
bridge drm/panel: Changes for v4.4-rc1 2015-11-05 11:07:13 +10:00
cirrus drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
exynos drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
fsl-dcu drm: Stop using drm_vblank_count() as the hw frame counter 2015-10-07 16:13:52 +02:00
gma500 drm/gma500: Add driver private mutex for the fault handler 2015-12-01 10:05:11 +01:00
i2c Merge branch 'drm-tda998x-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into drm-next 2015-10-15 14:17:13 +10:00
i810
i915 drm/i915: Break busywaiting for requests on pending signals 2015-12-18 17:11:47 +01:00
imx Linux 4.4-rc4 2015-12-08 11:04:26 +10:00
mga drm/irq: Use unsigned int pipe in public API 2015-10-06 12:57:47 +02:00
mgag200 drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
msm drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
nouveau Linux 4.4-rc4 2015-12-08 11:04:26 +10:00
omapdrm drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
panel spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
qxl drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
r128 drm/irq: Use unsigned int pipe in public API 2015-10-06 12:57:47 +02:00
radeon Linux 4.4-rc4 2015-12-08 11:04:26 +10:00
rcar-du drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
rockchip Linux 4.4-rc4 2015-12-08 11:04:26 +10:00
savage
shmobile drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
sis include/uapi/drm/sis_drm.h: move sis_file_private to drivers/gpu/drm/sis/sis_drv.h 2015-10-16 11:27:46 +10:00
sti drm/sti: load HQVDP firmware the first time HQVDP's plane is used 2015-11-03 13:04:56 +01:00
tdfx
tegra drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
tilcdc drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
ttm drm/ttm: Fix memory space allocation v2 2015-09-15 00:57:01 -07:00
udl drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
vc4 drm/vc4: Make sure that planes aren't scaled. 2015-11-17 12:27:03 -08:00
vgem drm/vgem: Drop vgem_drm_gem_mmap 2015-10-19 11:00:44 +02:00
via via_drm.h: move struct via_file_private definition to drivers/gpu/drm/via/via_drv.h 2015-10-16 11:27:49 +10:00
virtio Linux 4.4-rc4 2015-12-08 11:04:26 +10:00
vmwgfx drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
ati_pcigart.c
drm_agpsupport.c drm: Remove __OS_HAS_AGP 2015-09-30 10:44:48 +02:00
drm_atomic.c drm: Implement drm_modeset_lock_all_ctx() 2015-12-02 23:10:59 +01:00
drm_atomic_helper.c drm/atomic-helper: Reject attempts at re-stealing encoders 2015-12-03 10:50:27 +01:00
drm_auth.c
drm_bridge.c
drm_bufs.c drm: Remove __OS_HAS_AGP 2015-09-30 10:44:48 +02:00
drm_cache.c
drm_context.c
drm_crtc.c drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
drm_crtc_helper.c drm/atomic-helper: Implement subsystem-level suspend/resume 2015-12-02 23:11:17 +01:00
drm_crtc_internal.h
drm_debugfs.c
drm_dma.c
drm_dp_helper.c Linux 4.3-rc2 2015-09-24 17:18:41 +02:00
drm_dp_mst_topology.c dp/mst: add SDP stream support 2015-12-10 10:00:42 +01:00
drm_drv.c drm: Fix an unwanted master inheritance v2 2015-12-04 12:28:14 +10:00
drm_edid.c drm/edid: Make the detailed timing CEA/HDMI mode fixup accept up to 5kHz clock difference 2015-12-01 07:57:14 +01:00
drm_edid_load.c drm: Constify generic_edid_names[] 2015-09-08 13:45:52 +02:00
drm_encoder_slave.c
drm_fb_cma_helper.c drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
drm_fb_helper.c drm/core: Fix old_fb handling in pan_display_atomic. 2015-11-17 13:02:14 +02:00
drm_flip_work.c
drm_fops.c Linux 4.4-rc4 2015-12-08 11:04:26 +10:00
drm_gem.c drm/gem: Update/Polish docs 2015-11-24 11:41:49 +01:00
drm_gem_cma_helper.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-11-10 09:33:06 -08:00
drm_global.c
drm_hashtab.c
drm_info.c
drm_internal.h drm: move drm_class into drm_sysfs.c 2015-09-09 15:05:17 +02:00
drm_ioc32.c drm: Remove __OS_HAS_AGP 2015-09-30 10:44:48 +02:00
drm_ioctl.c drm: Enforce unlocked ioctl operation for kms driver ioctls 2015-10-16 15:50:54 +02:00
drm_irq.c drm/nouveau: Fix pre-nv50 pageflip events (v4) 2015-12-04 13:49:38 +10:00
drm_legacy.h
drm_lock.c signals: kill block_all_signals() and unblock_all_signals() 2015-11-06 17:50:42 -08:00
drm_memory.c drm: Remove __OS_HAS_AGP 2015-09-30 10:44:48 +02:00
drm_mipi_dsi.c
drm_mm.c drm/mm: Do DRM_MM_CREATE_TOP adj_start calculation after color_adjust 2015-09-08 13:45:47 +02:00
drm_modes.c drm/edid: Make the detailed timing CEA/HDMI mode fixup accept up to 5kHz clock difference 2015-12-01 07:57:14 +01:00
drm_modeset_lock.c drm: Implement drm_modeset_lock_all_ctx() 2015-12-02 23:10:59 +01:00
drm_of.c drm: Introduce generic probe function for component based masters. 2015-10-20 12:01:29 +02:00
drm_panel.c
drm_pci.c drm/doc: Update docs about device instance setup 2015-09-30 10:06:06 +02:00
drm_plane_helper.c drm: Print the src/dst/clip rectangles in error in drm_plane_helper 2015-11-24 11:47:47 +01:00
drm_platform.c drm/doc: Update docs about device instance setup 2015-09-30 10:06:06 +02:00
drm_prime.c
drm_probe_helper.c drm: keep connector status change logging human readable 2015-12-04 08:59:41 +01:00
drm_rect.c drm: Add "prefix" parameter to drm_rect_debug_print() 2015-11-24 11:47:46 +01:00
drm_scatter.c
drm_sysfs.c drm/sysfs: Send out uevent when connector->force changes 2015-11-24 11:49:34 +01:00
drm_trace.h
drm_trace_points.c
drm_vm.c drm: Remove __OS_HAS_AGP 2015-09-30 10:44:48 +02:00
drm_vma_manager.c drm/gem: Use kref_get_unless_zero for the weak mmap references 2015-10-19 11:00:44 +02:00
Kconfig drm/vc4: Add KMS support for Raspberry Pi. 2015-10-21 10:33:12 +01:00
Makefile Merge tag 'drm-vc4-next-2015-10-21' of http://github.com/anholt/linux into drm-next 2015-10-22 10:31:17 +10:00