On Wed, Jun 21, 2017 at 08:28:03PM +0200, Daniel Vetter wrote:
> Hi all,
>
> This is Thierry's deferred fbdev setup series, with the locking rework almost
> entirely redone. The much wider scope is to get rid of drm_modeset_lock_all
> calls for atomic drivers and remove users of the fairly nasty
> mode_config->acquire_ctx hack, which breaks when doing multiple atomic commits.
>
> Testing&review very much appreciated, especially from people who care about the
> various fbdev emulation things and the deferred setup stuff.
Tested on my Juno dev board on a bit of a convoluted setup: the dev board has
built into the SoC 2x HDLCD instances and I also have an FPGA daughter board
with Mali DP 650 running again on a 2x configuration. On boot I'm getting this
warning:
juno-r0-ld login: [ 241.986785] INFO: task kworker/3:1:80 blocked for more than 120 seconds.
[ 241.993652] Not tainted 4.12.0-rc5-01275-g1e2237a19156 #2
[ 241.999689] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.007660] kworker/3:1 D 0 80 2 0x00000000
[ 242.013340] Workqueue: events output_poll_execute [drm_kms_helper]
[ 242.019637] Call trace:
[ 242.022132] [<ffff000008085798>] __switch_to+0x98/0xb0
[ 242.027373] [<ffff00000886b3d4>] __schedule+0x19c/0x5e8
[ 242.032699] [<ffff00000886b858>] schedule+0x38/0xa0
[ 242.037672] [<ffff00000886bd38>] schedule_preempt_disabled+0x20/0x38
[ 242.044144] [<ffff00000886c968>] __mutex_lock.isra.0+0x140/0x530
[ 242.050262] [<ffff00000886cd68>] __mutex_lock_slowpath+0x10/0x18
[ 242.056379] [<ffff00000886cda0>] mutex_lock+0x30/0x38
[ 242.061597] [<ffff000000929660>] drm_fb_helper_hotplug_event.part.22+0x20/0x100 [drm_kms_helper]
[ 242.070611] [<ffff000000929764>] drm_fb_helper_hotplug_event+0x24/0x38 [drm_kms_helper]
[ 242.078828] [<ffff00000092a360>] drm_fbdev_cma_hotplug_event+0x10/0x20 [drm_kms_helper]
[ 242.086984] [<ffff000000b44494>] hdlcd_fb_output_poll_changed+0x14/0x20 [hdlcd]
[ 242.094495] [<ffff000000919e90>] drm_kms_helper_hotplug_event+0x28/0x38 [drm_kms_helper]
[ 242.102801] [<ffff00000091a090>] output_poll_execute+0x1a0/0x1f0 [drm_kms_helper]
[ 242.110424] [<ffff0000080d7fd4>] process_one_work+0x1d4/0x330
[ 242.116280] [<ffff0000080d8178>] worker_thread+0x48/0x468
[ 242.121781] [<ffff0000080ddf64>] kthread+0x12c/0x130
[ 242.126839] [<ffff000008082ec0>] ret_from_fork+0x10/0x50
[ 242.132252] INFO: task kworker/5:1:82 blocked for more than 120 seconds.
[ 242.139074] Not tainted 4.12.0-rc5-01275-g1e2237a19156 #2
[ 242.145099] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.153064] kworker/5:1 D 0 82 2 0x00000000
[ 242.158724] Workqueue: events output_poll_execute [drm_kms_helper]
[ 242.165019] Call trace:
[ 242.167519] [<ffff000008085798>] __switch_to+0x98/0xb0
[ 242.172755] [<ffff00000886b3d4>] __schedule+0x19c/0x5e8
[ 242.178079] [<ffff00000886b858>] schedule+0x38/0xa0
[ 242.183051] [<ffff00000886bd38>] schedule_preempt_disabled+0x20/0x38
[ 242.189520] [<ffff00000886c968>] __mutex_lock.isra.0+0x140/0x530
[ 242.195639] [<ffff00000886cd68>] __mutex_lock_slowpath+0x10/0x18
[ 242.201756] [<ffff00000886cda0>] mutex_lock+0x30/0x38
[ 242.206972] [<ffff000000929660>] drm_fb_helper_hotplug_event.part.22+0x20/0x100 [drm_kms_helper]
[ 242.215984] [<ffff000000929764>] drm_fb_helper_hotplug_event+0x24/0x38 [drm_kms_helper]
[ 242.224201] [<ffff00000092a360>] drm_fbdev_cma_hotplug_event+0x10/0x20 [drm_kms_helper]
[ 242.232367] [<ffff000000b543a4>] malidp_output_poll_changed+0x14/0x20 [mali_dp]
[ 242.239880] [<ffff000000919e90>] drm_kms_helper_hotplug_event+0x28/0x38 [drm_kms_helper]
[ 242.248188] [<ffff00000091a090>] output_poll_execute+0x1a0/0x1f0 [drm_kms_helper]
[ 242.255808] [<ffff0000080d7fd4>] process_one_work+0x1d4/0x330
[ 242.261664] [<ffff0000080d8178>] worker_thread+0x48/0x468
[ 242.267196] [<ffff0000080ddf64>] kthread+0x12c/0x130
[ 242.272312] [<ffff000008082ec0>] ret_from_fork+0x10/0x50
Each hardware type has only one instance of each driver being connected to an
output, HDLCD is connected to an HDMI monitor that is not "active" (i.e.
input is switched to DP connection), while the Mali DP instance is connected to
a monitor.
Suggestions on where to look next are welcome.
Best regards,
Liviu
>
> Thanks, Daniel
>
> Daniel Vetter (7):
> drm/i915: Drop FBDEV #ifdev in mst code
> drm/fb-helper: Push locking in fb_is_bound
> drm/fb-helper: Drop locking from the vsync wait ioctl code
> drm/fb-helper: Push locking into pan_display_atomic|legacy
> drm/fb-helper: Push locking into restore_fbdev_mode_atomic|legacy
> drm/fb-helper: Stop using mode_config.mutex for internals
> drm/fb-helper: Split dpms handling into legacy and atomic paths
>
> Thierry Reding (5):
> drm/fb-helper: Push down modeset lock into FB helpers
> drm/fb-helper: Add top-level lock
> drm/fb-helper: Support deferred setup
> drm/exynos: Remove custom FB helper deferred setup
> drm/hisilicon: Remove custom FB helper deferred setup
>
> drivers/gpu/drm/drm_fb_helper.c | 361 ++++++++++++++++++------
> drivers/gpu/drm/drm_vblank.c | 2 +-
> drivers/gpu/drm/exynos/exynos_drm_drv.c | 6 +-
> drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 26 +-
> drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c | 21 +-
> drivers/gpu/drm/i915/intel_dp_mst.c | 43 +--
> drivers/gpu/drm/radeon/radeon_dp_mst.c | 7 -
> include/drm/drm_fb_helper.h | 42 ++-
> 8 files changed, 336 insertions(+), 172 deletions(-)
>
> --
> 2.11.0
>
> _______________________________________________
> dri-devel mailing list
> dri-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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