Chris Wilson a687a43a48 drm/i915: Force ringbuffers to not be at offset 0 ... For reasons unknown Sandybridge GT1 (at least) will eventually hang when it encounters a ring wraparound at offset 0. The test case that reproduces the bug reliably forces a large number of interrupted context switches, thereby causing very frequent ring wraparounds, but there are similar bug reports in the wild with the same symptoms, seqno writes stop just before the wrap and the ringbuffer at address 0. It is also timing crucial, but adding various delays hasn't helped pinpoint where the window lies. Whether the fault is restricted to the ringbuffer itself or the GTT addressing is unclear, but moving the ringbuffer fixes all the hangs I have been able to reproduce. References: (e.g.) https://bugs.freedesktop.org/show_bug.cgi?id=93262 Testcase: igt/gem_exec_whisper/render-contexts-interruptible #snb-gt1 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: stable@vger.kernel.org Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1460565315-7748-12-git-send-email-chris@chris-wilson.co.uk		2016-04-14 10:45:40 +01:00
..
amd	Merge branch 'drm-fixes-4.6' of git://people.freedesktop.org/~agd5f/linux into drm-fixes	2016-04-07 07:08:46 +10:00
arm	drm: ARM HDLCD - fix an error code	2016-04-04 10:11:33 +01:00
armada	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
ast	Merge tag 'topic/drm-misc-2016-03-14' of git://anongit.freedesktop.org/drm-intel into drm-next	2016-03-16 11:09:26 +10:00
atmel-hlcdc	drm/atmel-hlcdc: use helper to get crtc state	2016-03-15 14:09:48 +01:00
bochs	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2016-03-21 13:48:00 -07:00
bridge	drm/bridge: removed dummy mode_fixup function from dw-hdmi.	2016-02-11 09:24:01 +01:00
cirrus	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2016-03-21 13:48:00 -07:00
etnaviv	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2016-03-21 13:48:00 -07:00
exynos	drm/exynos: add DRM_EXYNOS_GEM_MAP ioctl	2016-03-13 14:54:03 +09:00
fsl-dcu	drm/fsl-dcu: removed optional dummy crtc mode_fixup function.	2016-03-04 18:16:45 +01:00
gma500	gma500: remove annoying deprecation warning	2016-04-04 12:38:46 -07:00
i2c	Merge drm-fixes into drm-next.	2016-03-14 09:46:02 +10:00
i810	…
i915	drm/i915: Force ringbuffers to not be at offset 0	2016-04-14 10:45:40 +01:00
imx	drm/imx: Don't set a gamma table size	2016-03-31 11:24:37 +02:00
mga	…
mgag200	drm/mgag200: removed optional dummy crtc mode_fixup function.	2016-03-04 17:54:17 +01:00
msm	drm/msm: fix typo in the !COMMON_CLK case	2016-03-23 18:15:49 -04:00
nouveau	Merge branch 'linux-4.6' of git://github.com/skeggsb/linux into drm-fixes	2016-04-06 16:16:52 +10:00
omapdrm	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2016-03-25 08:48:31 -07:00
panel	drm/panel: Changes for v4.6-rc1	2016-03-17 08:09:44 +10:00
qxl	Merge drm-fixes into drm-next.	2016-03-14 09:46:02 +10:00
r128	…
radeon	Merge branch 'drm-fixes-4.6' of git://people.freedesktop.org/~agd5f/linux into drm-fixes	2016-04-07 07:08:46 +10:00
rcar-du	drm/rcar-du: removed optional dummy crtc mode_fixup function.	2016-03-04 17:58:47 +01:00
rockchip	drm/rockchip: dw_hdmi: Don't call platform_set_drvdata()	2016-03-28 14:48:32 +08:00
savage	…
shmobile	drm/shmobile: removed optional dummy crtc mode_fixup function.	2016-03-04 17:59:44 +01:00
sis	…
sti	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2016-03-21 13:48:00 -07:00
tdfx	…
tegra	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2016-03-21 13:48:00 -07:00
tilcdc	drm/tilcdc: Use devm_kzalloc() and devm_kcalloc() for private data	2016-02-25 16:39:47 +02:00
ttm	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
udl	drm/udl: Use unlocked gem unreferencing	2016-04-01 13:22:33 +10:00
vc4	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2016-03-21 13:48:00 -07:00
vgem	…
via	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
virtio	drm/virtio: removed optional dummy crtc mode_fixup function.	2016-03-04 18:15:38 +01:00
vmwgfx	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2016-03-21 13:48:00 -07:00
Kconfig	Merge branch 'drm-next-4.6' of git://people.freedesktop.org/~agd5f/linux into drm-next	2016-02-19 11:13:01 +10:00
Makefile	Merge tag 'topic/drm-misc-2016-02-18' of git://anongit.freedesktop.org/drm-intel into drm-next	2016-02-19 10:57:44 +10:00
ati_pcigart.c	…
drm_agpsupport.c	…
drm_atomic.c	Merge tag 'topic/drm-misc-2016-03-22' of git://anongit.freedesktop.org/drm-intel into drm-next	2016-03-24 08:41:59 +10:00
drm_atomic_helper.c	Merge tag 'topic/drm-misc-2016-03-22' of git://anongit.freedesktop.org/drm-intel into drm-next	2016-03-24 08:41:59 +10:00
drm_auth.c	…
drm_bridge.c	drm/bridge: Make (pre/post) enable/disable callbacks optional	2016-03-02 17:31:03 +01:00
drm_bufs.c	…
drm_cache.c	…
drm_context.c	…
drm_crtc.c	Merge tag 'topic/drm-misc-2016-03-14' of git://anongit.freedesktop.org/drm-intel into drm-next	2016-03-16 11:09:26 +10:00
drm_crtc_helper.c	drm: introduce pipe color correction properties	2016-03-08 13:57:32 +01:00
drm_crtc_internal.h	…
drm_debugfs.c	…
drm_dma.c	…
drm_dp_aux_dev.c	drm/dp: Add a drm_aux-dev module for reading/writing dpcd registers.	2016-02-12 14:22:40 +01:00
drm_dp_helper.c	drm/dp: move hw_mutex up the call stack	2016-04-01 13:17:36 +10:00
drm_dp_mst_topology.c	Revert "drm/dp/mst: change MST detection scheme"	2016-02-17 14:07:48 +10:00
drm_drv.c	…
drm_edid.c	drm/edid: Extract SADs properly from multiple audio data blocks	2016-03-13 19:36:17 +01:00
drm_edid_load.c	drm/edid: convert to use match_string() helper	2016-03-17 15:09:34 -07:00
drm_encoder_slave.c	drm: fixes when i2c encoder slave mode_fixup is null.	2016-02-10 15:14:49 +01:00
drm_fb_cma_helper.c	drm/fb_cma_helper: remove duplicate const from drm_fb_cma_alloc	2016-01-20 13:55:57 +01:00
drm_fb_helper.c	drm/fb_helper: Use add_one_connector in add_all_connectors.	2016-02-15 14:56:46 +01:00
drm_flip_work.c	…
drm_fops.c	drm: Nuke vblank event file cleanup code	2016-02-08 09:55:47 +01:00
drm_gem.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
drm_gem_cma_helper.c	dma, mm/pat: Rename dma_*_writecombine() to dma_*_wc()	2016-03-09 14:57:51 +01:00
drm_global.c	…
drm_hashtab.c	tree wide: use kvfree() than conditional kfree()/vfree()	2016-01-22 17:02:18 -08:00
drm_info.c	…
drm_internal.h	…
drm_ioc32.c	…
drm_ioctl.c	…
drm_irq.c	Merge drm-fixes into drm-next.	2016-03-14 09:46:02 +10:00
drm_kms_helper_common.c	drm/dp: Add a drm_aux-dev module for reading/writing dpcd registers.	2016-02-12 14:22:40 +01:00
drm_legacy.h	…
drm_lock.c	…
drm_memory.c	…
drm_mipi_dsi.c	drm/dsi: Get DSI host by DT device node	2016-03-02 17:02:54 +01:00
drm_mm.c	…
drm_modes.c	drm: modes: add missing [drm] to message printing	2016-02-09 16:34:44 +01:00
drm_modeset_lock.c	…
drm_of.c	drm: add drm_of_encoder_active_endpoint helpers	2016-02-10 14:19:21 +01:00
drm_panel.c	…
drm_pci.c	…
drm_plane_helper.c	…
drm_platform.c	…
drm_prime.c	drm: prime: Honour O_RDWR during prime-handle-to-fd	2016-02-09 09:25:12 +01:00
drm_probe_helper.c	…
drm_rect.c	…
drm_scatter.c	…
drm_sysfs.c	drm/sysfs: use kobj_to_dev()	2016-01-13 16:43:07 +01:00
drm_trace.h	…
drm_trace_points.c	…
drm_vm.c	…
drm_vma_manager.c	…