AuxXxilium/linux_dsm_epyc7002
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24835e442f
linux_dsm_epyc7002/drivers/gpu/drm
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Daniel Vetter 24835e442f drm: reference count event->completion 
When writing the generic nonblocking commit code I assumed that
through clever lifetime management I can assure that the completion
(stored in drm_crtc_commit) only gets freed after it is completed. And
that worked.

I also wanted to make nonblocking helpers resilient against driver
bugs, by having timeouts everywhere. And that worked too.

Unfortunately taking boths things together results in oopses :( Well,
at least sometimes: What seems to happen is that the drm event hangs
around forever stuck in limbo land. The nonblocking helpers eventually
time out, move on and release it. Now the bug I tested all this
against is drivers that just entirely fail to deliver the vblank
events like they should, and in those cases the event is simply
leaked. But what seems to happen, at least sometimes, on i915 is that
the event is set up correctly, but somohow the vblank fails to fire in
time. Which means the event isn't leaked, it's still there waiting for
eventually a vblank to fire. That tends to happen when re-enabling the
pipe, and then the trap springs and the kernel oopses.

The correct fix here is simply to refcount the crtc commit to make
sure that the event sticks around even for drivers which only
sometimes fail to deliver vblanks for some arbitrary reasons. Since
crtc commits are already refcounted that's easy to do.

References: https://bugs.freedesktop.org/show_bug.cgi?id=96781
Cc: Jim Rees <rees@umich.edu>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161221102331.31033-1-daniel.vetter@ffwll.ch
2017-01-04 11:03:06 +01:00
..
amd drm/mm: Convert to drm_printer 2016-12-30 12:08:28 +01:00
arc drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
arm drm: Nuke fb->pixel_format 2016-12-15 14:55:34 +02:00
armada drm/armada: Fix compile fail 2016-12-30 17:47:04 +01:00
ast drm: Don't include <drm/drm_encoder.h> in <drm/drm_crtc.h> 2016-12-18 16:29:29 +05:30
atmel-hlcdc drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
bochs drm: Don't include <drm/drm_encoder.h> in <drm/drm_crtc.h> 2016-12-18 16:29:29 +05:30
bridge drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
cirrus drm: Don't include <drm/drm_encoder.h> in <drm/drm_crtc.h> 2016-12-18 16:29:29 +05:30
etnaviv drm/mm: Convert to drm_printer 2016-12-30 12:08:28 +01:00
exynos drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
fsl-dcu drm: Deduplicate driver initialization message 2016-12-30 12:37:39 +01:00
gma500 drm: Don't include <drm/drm_encoder.h> in <drm/drm_crtc.h> 2016-12-18 16:29:29 +05:30
hisilicon drm: Deduplicate driver initialization message 2016-12-30 12:37:39 +01:00
i2c drm/i2c: tda998x: fix spelling mistake 2016-11-18 00:00:40 +00:00
i810 drm: define drm_compat_ioctl NULL on CONFIG_COMPAT=n and reduce #ifdefs 2016-11-02 11:33:47 -04:00
i915 drm: Wrap drm_mm_node.hole_follows 2016-12-28 13:30:24 +01:00
imx drm: bridge: Detach bridge from encoder at encoder cleanup time 2016-12-18 16:32:49 +05:30
lib drm: Add a simple generator of random permutations 2016-12-27 12:34:00 +01:00
mediatek drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
meson drm: Nuke fb->pixel_format 2016-12-15 14:55:34 +02:00
mga
mgag200 gpu: drm: mgag200: mgag200_main:- Handle error from pci_iomap 2017-01-04 10:15:37 +01:00
msm drm/mm: Convert to drm_printer 2016-12-30 12:08:28 +01:00
mxsfb drm: Nuke fb->pixel_format 2016-12-15 14:55:34 +02:00
nouveau drm: nouveau: fix build when LEDS_CLASS=m 2017-01-04 09:55:57 +01:00
omapdrm drm/mm: Convert to drm_printer 2016-12-30 12:08:28 +01:00
panel drm/panel: simple: Add support for AUO G185HAN01 2016-12-06 17:06:32 +01:00
qxl drm/mm: Convert to drm_printer 2016-12-30 12:08:28 +01:00
r128
radeon drm/mm: Convert to drm_printer 2016-12-30 12:08:28 +01:00
rcar-du drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
rockchip drm: rockchip: use crtc helper drm_crtc_from_index() 2016-12-30 12:15:11 +01:00
savage drm: define drm_compat_ioctl NULL on CONFIG_COMPAT=n and reduce #ifdefs 2016-11-02 11:33:47 -04:00
selftests drm/mm: Convert to drm_printer 2016-12-30 12:08:28 +01:00
shmobile drm: Don't include <drm/drm_encoder.h> in <drm/drm_crtc.h> 2016-12-18 16:29:29 +05:30
sis drm: define drm_compat_ioctl NULL on CONFIG_COMPAT=n and reduce #ifdefs 2016-11-02 11:33:47 -04:00
sti drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
sun4i drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
tdfx drm: define drm_compat_ioctl NULL on CONFIG_COMPAT=n and reduce #ifdefs 2016-11-02 11:33:47 -04:00
tegra drm: Deduplicate driver initialization message 2016-12-30 12:37:39 +01:00
tilcdc drm/mm: Convert to drm_printer 2016-12-30 12:08:28 +01:00
ttm drm/mm: Convert to drm_printer 2016-12-30 12:08:28 +01:00
udl drm: Nuke fb->bits_per_pixel 2016-12-15 14:55:34 +02:00
vc4 drm: Don't include <drm/drm_encoder.h> in <drm/drm_crtc.h> 2016-12-18 16:29:29 +05:30
vgem drm: Take ownership of the dmabuf->obj when exporting 2016-12-08 10:29:22 +01:00
via drm: define drm_compat_ioctl NULL on CONFIG_COMPAT=n and reduce #ifdefs 2016-11-02 11:33:47 -04:00
virtio drm: Deduplicate driver initialization message 2016-12-30 12:37:39 +01:00
vmwgfx drm/vmwgfx: use designated initializers 2016-12-18 14:48:26 +01:00
zte drm: zte: use crtc helper drm_crtc_from_index() 2016-12-30 12:15:01 +01:00
ati_pcigart.c
drm_agpsupport.c
drm_atomic_helper.c drm: reference count event->completion 2017-01-04 11:03:06 +01:00
drm_atomic.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_auth.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_blend.c
drm_bridge.c drm/bridge: Use recommened kerneldoc for struct member refs 2017-01-02 09:17:26 +01:00
drm_bufs.c
drm_cache.c
drm_color_mgmt.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_connector.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_context.c
drm_crtc_helper_internal.h
drm_crtc_helper.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_crtc_internal.h drm: Move atomic debugfs functions into drm_crtc_internal.h 2016-12-18 14:18:12 +01:00
drm_crtc.c drm: add crtc helper drm_crtc_from_index() 2016-12-30 12:11:59 +01:00
drm_debugfs_crc.c
drm_debugfs.c drm: Move atomic debugfs functions into drm_crtc_internal.h 2016-12-18 14:18:12 +01:00
drm_dma.c
drm_dp_aux_dev.c
drm_dp_dual_mode_helper.c drm: Print some debug/error info during DP dual mode detect 2016-10-26 15:57:11 -04:00
drm_dp_helper.c
drm_dp_mst_topology.c drm/dp/mst: Check peer device type before attempting EDID read 2016-10-26 18:53:44 +02:00
drm_drv.c drm: Avoid NULL dereference of drm_device.dev 2016-12-30 15:29:44 +01:00
drm_dumb_buffers.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_edid_load.c
drm_edid.c drm/edid: constify edid quirk list 2017-01-02 15:06:39 +02:00
drm_encoder_slave.c
drm_encoder.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_fb_cma_helper.c drm/cma-helpers: Use recommened kerneldoc for struct member refs 2016-12-30 17:58:15 +01:00
drm_fb_helper.c drm: Wrap the check for atomic_commit implementation 2016-12-27 10:44:00 +01:00
drm_flip_work.c
drm_fops.c drm: reference count event->completion 2017-01-04 11:03:06 +01:00
drm_fourcc.c drm: move allocation out of drm_get_format_name() 2016-11-12 14:19:38 +01:00
drm_framebuffer.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_gem_cma_helper.c drm/cma-helpers: Use recommened kerneldoc for struct member refs 2016-12-30 17:58:15 +01:00
drm_gem.c
drm_global.c drm: Update TTM initialization documentation 2016-12-30 12:52:10 +01:00
drm_hashtab.c
drm_info.c
drm_internal.h drm/irq: drm_legacy_ prefix for legacy ioctls 2016-12-18 14:18:12 +01:00
drm_ioc32.c
drm_ioctl.c drm: Export drm_ioctl_permit to kernel-doc 2016-12-30 12:40:48 +01:00
drm_irq.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_kms_helper_common.c
drm_legacy.h
drm_lock.c drm: Avoid NULL dereference for DRM_LEGACY debug message 2016-11-28 08:39:41 +01:00
drm_memory.c
drm_mipi_dsi.c
drm_mm.c drm/mm: Some doc polish 2016-12-30 12:53:51 +01:00
drm_mode_config.c drm: Clean up connectors by unreferencing them 2016-12-18 14:33:51 +01:00
drm_mode_object.c drm: Get atomic property value even if DRIVER_ATOMIC is not set 2016-12-27 10:44:33 +01:00
drm_modes.c Revert "drm: Add aspect ratio parsing in DRM layer" 2016-11-15 15:01:42 +01:00
drm_modeset_helper.c drm: Convert all helpers to drm_connector_list_iter 2016-12-18 14:33:22 +01:00
drm_modeset_lock.c drm/doc: Fix indenting in drm_modeset_lock.c comment 2016-11-29 23:34:36 +01:00
drm_of.c drm: Don't include <drm/drm_encoder.h> in <drm/drm_crtc.h> 2016-12-18 16:29:29 +05:30
drm_panel.c
drm_pci.c drm: Deduplicate driver initialization message 2016-12-30 12:37:39 +01:00
drm_plane_helper.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_plane.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_platform.c drm: Deduplicate driver initialization message 2016-12-30 12:37:39 +01:00
drm_prime.c drm: Take ownership of the dmabuf->obj when exporting 2016-12-08 10:29:22 +01:00
drm_print.c drm/printer: add debug printer 2016-12-30 11:43:40 +01:00
drm_probe_helper.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_property.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_rect.c drm/rect: Fix formatting of example code 2016-12-30 13:35:54 +01:00
drm_scatter.c
drm_simple_kms_helper.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_sysfs.c
drm_trace_points.c
drm_trace.h
drm_vm.c
drm_vma_manager.c
Kconfig drm: Add some kselftests for the DRM range manager (struct drm_mm) 2016-12-27 12:34:39 +01:00
Makefile drm: Fix O= out-of-tree builds for selftests 2016-12-28 11:34:57 +01:00