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Rodrigo Siqueira 8976f73b67 drm/amd/display: Always get CRTC updated constant values inside commit tail 
We recently improved our display atomic commit and tail sequence to
avoid some issues related to concurrency. One of the major changes
consisted of moving the interrupt disable and the stream release from
our atomic commit to our atomic tail (commit 6d90a208cf
("drm/amd/display: Move disable interrupt into commit tail")) .
However, the new code introduced inside our commit tail function was
inserted right after the function
drm_atomic_helper_update_legacy_modeset_state(), which has routines for
updating internal data structs related to timestamps. As a result, in
certain conditions, the display module can reach a situation where we
update our constants and, after that, clean it. This situation generates
the following warning:

 amdgpu 0000:03:00.0: drm_WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev))
 WARNING: CPU: 6 PID: 1269 at drivers/gpu/drm/drm_vblank.c:722
 drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x32b/0x340 [drm]
 ...
 RIP:
 0010:drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x32b/0x340
 [drm]
 ...
 Call Trace:
  ? dc_stream_get_vblank_counter+0x57/0x60 [amdgpu]
  drm_crtc_vblank_helper_get_vblank_timestamp+0x1c/0x20 [drm]
  drm_get_last_vbltimestamp+0xad/0xc0 [drm]
  drm_reset_vblank_timestamp+0x63/0xd0 [drm]
  drm_crtc_vblank_on+0x85/0x150 [drm]
  amdgpu_dm_atomic_commit_tail+0xaf1/0x2330 [amdgpu]
  commit_tail+0x99/0x130 [drm_kms_helper]
  drm_atomic_helper_commit+0x123/0x150 [drm_kms_helper]
  amdgpu_dm_atomic_commit+0x11/0x20 [amdgpu]
  drm_atomic_commit+0x4a/0x50 [drm]
  drm_atomic_helper_set_config+0x7c/0xc0 [drm_kms_helper]
  drm_mode_setcrtc+0x20b/0x7e0 [drm]
  ? tomoyo_path_number_perm+0x6f/0x200
  ? drm_mode_getcrtc+0x190/0x190 [drm]
  drm_ioctl_kernel+0xae/0xf0 [drm]
  drm_ioctl+0x245/0x400 [drm]
  ? drm_mode_getcrtc+0x190/0x190 [drm]
  amdgpu_drm_ioctl+0x4e/0x80 [amdgpu]
  __x64_sys_ioctl+0x91/0xc0
  do_syscall_64+0x38/0x90
  entry_SYSCALL_64_after_hwframe+0x44/0xa9
 ...

For fixing this issue we rely upon a refactor introduced on
drm_atomic_helper_update_legacy_modeset_state ("Remove the timestamping
constant update from drm_atomic_helper_update_legacy_modeset_state()")
which decouples constant values update from
drm_atomic_helper_update_legacy_modeset_state to a new helper.
Basically, this commit uses this new helper and place it right after our
release module to avoid a situation where our CRTC struct gets wrong
values.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1373
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2020-11-18 14:35:15 -05:00
arch Linux 5.10-rc3 2020-11-10 14:36:36 +01:00
block blk-mq: mark flush request as IDLE in flush_end_io() 2020-10-30 08:33:49 -06:00
certs
crypto drivers-5.10-2020-10-12 2020-10-13 13:04:41 -07:00
Documentation Linux 5.10-rc3 2020-11-10 14:36:36 +01:00
drivers drm/amd/display: Always get CRTC updated constant values inside commit tail 2020-11-18 14:35:15 -05:00
fs Fixes for 5.10-rc3: 2020-11-08 10:23:07 -08:00
include drm/fourcc: fix AMD modifiers PACKERS field doc 2020-11-16 12:20:13 -05:00
init linux-kselftest-kunit-5.10-rc1 2020-10-18 14:45:59 -07:00
ipc ipc: adjust proc_ipc_sem_dointvec definition to match prototype 2020-09-05 12:14:29 -07:00
kernel fork: fix copy_process(CLONE_PARENT) race with the exiting ->real_parent 2020-11-08 11:18:39 -08:00
lib drm fixes for 5.10-rc3 2020-11-06 12:54:00 -08:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
mm mm/truncate.c: make __invalidate_mapping_pages() static 2020-11-02 12:14:19 -08:00
net Networking fixes for 5.10-rc3, including fixes from wireless, can, 2020-11-06 11:50:28 -08:00
samples misc: mic: remove the MIC drivers 2020-10-28 19:12:03 +01:00
scripts Driver core documentation fixes for 5.10-rc3 2020-11-08 11:30:25 -08:00
security ima: Replace zero-length array with flexible-array member 2020-10-29 17:22:59 -05:00
sound ASoC: Fixes for v5.10 2020-11-05 18:19:32 +01:00
tools Linux 5.10-rc3 2020-11-10 14:36:36 +01:00
usr
virt kvm: x86/mmu: Support dirty logging for the TDP MMU 2020-10-23 03:42:13 -04:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore .gitignore: docs: ignore sphinx_*/ directories 2020-09-10 10:44:31 -06:00
.mailmap MAINTAINERS: jarkko.sakkinen@linux.intel.com -> jarkko@kernel.org 2020-10-16 11:11:19 -07:00
COPYING
CREDITS MAINTAINERS: Move Sangbeom Kim to credits 2020-10-26 10:11:18 +01:00
Kbuild
Kconfig
MAINTAINERS Linux 5.10-rc3 2020-11-10 14:36:36 +01:00
Makefile Linux 5.10-rc3 2020-11-08 16:10:16 -08:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.