Imre Deak 319404df2f drm/i915/bxt: work around HW coherency issue when accessing GPU seqno ... By running igt/store_dword_loop_render on BXT we can hit a coherency problem where the seqno written at GPU command completion time is not seen by the CPU. This results in __i915_wait_request seeing the stale seqno and not completing the request (not considering the lost interrupt/GPU reset mechanism). I also verified that this isn't a case of a lost interrupt, or that the command didn't complete somehow: when the coherency issue occured I read the seqno via an uncached GTT mapping too. While the cached version of the seqno still showed the stale value the one read via the uncached mapping was the correct one. Work around this issue by clflushing the corresponding CPU cacheline following any store of the seqno and preceding any reading of it. When reading it do this only when the caller expects a coherent view. v2: - fix using the proper logical && instead of a bitwise & (Jani, Mika) - limit the workaround to A stepping, on later steppings this HW issue is fixed v3: - use a separate get_seqno/set_seqno vfunc (Chris) Testcase: igt/store_dword_loop_render Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>		2015-08-26 09:39:13 +02:00
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amd	Merge tag 'drm-intel-fixes-2015-08-14' into drm-intel-next-fixes	2015-08-14 18:11:30 +02:00
armada	Merge branch 'drm-armada-fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into drm-fixes	2015-07-17 10:06:04 +10:00
ast
atmel-hlcdc	Merge tag 'drm-intel-fixes-2015-08-14' into drm-intel-next-fixes	2015-08-14 18:11:30 +02:00
bochs
bridge	drm/exynos: atomic dpms support	2015-06-20 00:32:52 +09:00
cirrus
exynos	drm/atomic: pass old crtc state to atomic_begin/flush.	2015-07-27 16:23:22 +02:00
gma500
i2c	Merge branch 'drm-tda998x-fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm	2015-08-07 04:48:46 +03:00
i810
i915	drm/i915/bxt: work around HW coherency issue when accessing GPU seqno	2015-08-26 09:39:13 +02:00
imx	drm/imx: tve: fix media bus format for VGA output	2015-07-10 11:02:47 +02:00
mga
mgag200	Merge tag 'topic/drm-misc-2015-07-23' of git://anongit.freedesktop.org/drm-intel into drm-next	2015-07-24 14:28:16 +10:00
msm	Merge tag 'drm-intel-fixes-2015-08-14' into drm-intel-next-fixes	2015-08-14 18:11:30 +02:00
nouveau	Merge tag 'drm-intel-fixes-2015-08-14' into drm-intel-next-fixes	2015-08-14 18:11:30 +02:00
omapdrm	drm/omap: replace ALIGN(PAGE_SIZE) by PAGE_ALIGN	2015-07-02 15:58:07 +03:00
panel	drm/panel: simple: Add bus format for HannStar HSD100PXN1	2015-06-12 16:40:42 +02:00
qxl	drm/qxl: Propagate correctly errors from qxlhw_handle_to_bo	2015-06-05 11:00:52 +10:00
r128
radeon	Merge tag 'drm-intel-fixes-2015-08-14' into drm-intel-next-fixes	2015-08-14 18:11:30 +02:00
rcar-du	drm/atomic: pass old crtc state to atomic_begin/flush.	2015-07-27 16:23:22 +02:00
rockchip	Merge branch 'drm-rockchip-2015-07-13' of https://github.com/markyzq/kernel-drm-rockchip into drm-fixes	2015-07-17 10:25:02 +10:00
savage
shmobile	drm: Simplify drm_for_each_legacy_plane arguments	2015-07-22 16:25:45 +02:00
sis
sti	drm/atomic: pass old crtc state to atomic_begin/flush.	2015-07-27 16:23:22 +02:00
tdfx
tegra	drm: Make the connector dpms callback return a value, v2.	2015-07-27 16:23:28 +02:00
tilcdc	drm/tilcdc: Add DRM_TILCDC_SLAVE_COMPAT for ti,tilcdc,slave binding support	2015-05-27 13:13:33 +03:00
ttm	drm/ttm: recognize ARM64 arch in ioprot handler	2015-07-24 11:51:14 +10:00
udl
vgem	drm/vgem: Set unique to "vgem"	2015-06-24 11:20:46 +10:00
via
virtio	virtio-gpu: add locking for vbuf pool	2015-06-16 11:22:41 +02:00
vmwgfx	drm: Make the connector dpms callback return a value, v2.	2015-07-27 16:23:28 +02:00
ati_pcigart.c
drm_agpsupport.c
drm_atomic_helper.c	Merge tag 'drm-intel-fixes-2015-08-14' into drm-intel-next-fixes	2015-08-14 18:11:30 +02:00
drm_atomic.c	Merge tag 'topic/connector-locking-2015-07-23' of git://anongit.freedesktop.org/drm-intel into drm-next	2015-07-24 14:30:29 +10:00
drm_auth.c
drm_bridge.c
drm_bufs.c
drm_cache.c	drm: Avoid the double clflush on the last cache line in drm_clflush_virt_range()	2015-06-19 17:25:17 +02:00
drm_context.c	drm: Convert drm_legacy_ctxbitmap_init to void return type	2015-07-02 17:00:48 +02:00
drm_crtc_helper.c	drm: Make the connector dpms callback return a value, v2.	2015-07-27 16:23:28 +02:00
drm_crtc_internal.h
drm_crtc.c	Merge tag 'drm-intel-fixes-2015-08-14' into drm-intel-next-fixes	2015-08-14 18:11:30 +02:00
drm_debugfs.c
drm_dma.c
drm_dp_helper.c
drm_dp_mst_topology.c	drm/dp-mst: Remove debug WARN_ON	2015-08-04 11:10:16 +02:00
drm_drv.c	Merge tag 'topic/connector-locking-2015-07-23' of git://anongit.freedesktop.org/drm-intel into drm-next	2015-07-24 14:30:29 +10:00
drm_edid_load.c
drm_edid.c	drm: Roll out drm_for_each_connector more	2015-07-22 16:25:47 +02:00
drm_encoder_slave.c
drm_fb_cma_helper.c	drm: Roll out drm_for_each_{plane,crtc,encoder}	2015-07-22 17:29:37 +02:00
drm_fb_helper.c	Merge tag 'topic/connector-locking-2015-07-23' of git://anongit.freedesktop.org/drm-intel into drm-next	2015-07-24 14:30:29 +10:00
drm_flip_work.c
drm_fops.c
drm_gem_cma_helper.c	drm/cma-helper: Fix locking in drm_fb_cma_debugfs_show	2015-07-22 17:29:24 +02:00
drm_gem.c	drm/gem: rip out drm vma accounting for gem mmaps	2015-07-14 12:18:45 +02:00
drm_global.c
drm_hashtab.c
drm_info.c
drm_internal.h
drm_ioc32.c	Merge tag 'topic/drm-misc-2015-07-23' of git://anongit.freedesktop.org/drm-intel into drm-next	2015-07-24 14:28:16 +10:00
drm_ioctl.c	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2015-06-26 13:18:51 -07:00
drm_irq.c	Merge tag 'drm-intel-fixes-2015-08-14' into drm-intel-next-fixes	2015-08-14 18:11:30 +02:00
drm_legacy.h	drm: Convert drm_legacy_ctxbitmap_init to void return type	2015-07-02 17:00:48 +02:00
drm_lock.c	drm: Reject DRI1 hw lock ioctl functions for kms drivers	2015-07-02 17:00:48 +02:00
drm_memory.c
drm_mipi_dsi.c
drm_mm.c	drm: clean up drm_mm debugfs output	2015-05-29 09:17:57 +10:00
drm_modes.c
drm_modeset_lock.c	drm: Roll out drm_for_each_{plane,crtc,encoder}	2015-07-22 17:29:37 +02:00
drm_of.c	drm: Add modeset object iterators	2015-07-22 16:25:45 +02:00
drm_panel.c
drm_pci.c
drm_plane_helper.c	drm/atomic: pass old crtc state to atomic_begin/flush.	2015-07-27 16:23:22 +02:00
drm_platform.c
drm_prime.c	drm: prime: Document gem_prime_mmap	2015-06-19 17:50:05 +02:00
drm_probe_helper.c	drm/probe-helper: Grab mode_config.mutex in poll_init/enable	2015-07-22 16:25:45 +02:00
drm_rect.c
drm_scatter.c
drm_sysfs.c	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2015-06-26 13:18:51 -07:00
drm_trace_points.c
drm_trace.h
drm_vm.c
drm_vma_manager.c
Kconfig	drm/amdgpu: add core driver (v4)	2015-06-03 21:03:15 -04:00
Makefile	drm/amdgpu: add core driver (v4)	2015-06-03 21:03:15 -04:00