On 4/22/2022 11:25 PM, Dmitry Baryshkov wrote:
On Sat, 23 Apr 2022 at 03:12, Abhinav Kumar quic_abhinavk@quicinc.com wrote:
On 4/22/2022 5:07 PM, Dmitry Baryshkov wrote:
On 23/04/2022 02:45, Kuogee Hsieh wrote:
Current DP driver implementation has adding safe mode done at dp_hpd_plug_handle() which is expected to be executed under event thread context.
However there is possible circular locking happen (see blow stack trace) after edp driver call dp_hpd_plug_handle() from dp_bridge_enable() which is executed under drm_thread context.
To break this circular locking, this patch have safe mode added at dp_connector_get_mode() which is executed under drm thread context. Therefore no lock acquired required for &dev->mode_config.mutex while adding fail safe mode since it has been hold by drm thread already.
====================================================== WARNING: possible circular locking dependency detected 5.15.35-lockdep #6 Tainted: G W
frecon/429 is trying to acquire lock: ffffff808dc3c4e8 (&dev->mode_config.mutex){+.+.}-{3:3}, at: dp_panel_add_fail_safe_mode+0x4c/0xa0
but task is already holding lock: ffffff808dc441e0 (&kms->commit_lock[i]){+.+.}-{3:3}, at: lock_crtcs+0xb4/0x124
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&kms->commit_lock[i]){+.+.}-{3:3}: __mutex_lock_common+0x174/0x1a64 mutex_lock_nested+0x98/0xac lock_crtcs+0xb4/0x124 msm_atomic_commit_tail+0x330/0x748 commit_tail+0x19c/0x278 drm_atomic_helper_commit+0x1dc/0x1f0 drm_atomic_commit+0xc0/0xd8 drm_atomic_helper_set_config+0xb4/0x134 drm_mode_setcrtc+0x688/0x1248 drm_ioctl_kernel+0x1e4/0x338 drm_ioctl+0x3a4/0x684 __arm64_sys_ioctl+0x118/0x154 invoke_syscall+0x78/0x224 el0_svc_common+0x178/0x200 do_el0_svc+0x94/0x13c el0_svc+0x5c/0xec el0t_64_sync_handler+0x78/0x108 el0t_64_sync+0x1a4/0x1a8
-> #2 (crtc_ww_class_mutex){+.+.}-{3:3}: __mutex_lock_common+0x174/0x1a64 ww_mutex_lock+0xb8/0x278 modeset_lock+0x304/0x4ac drm_modeset_lock+0x4c/0x7c drmm_mode_config_init+0x4a8/0xc50 msm_drm_init+0x274/0xac0 msm_drm_bind+0x20/0x2c try_to_bring_up_master+0x3dc/0x470 __component_add+0x18c/0x3c0 component_add+0x1c/0x28 dp_display_probe+0x954/0xa98 platform_probe+0x124/0x15c really_probe+0x1b0/0x5f8 __driver_probe_device+0x174/0x20c driver_probe_device+0x70/0x134 __device_attach_driver+0x130/0x1d0 bus_for_each_drv+0xfc/0x14c __device_attach+0x1bc/0x2bc device_initial_probe+0x1c/0x28 bus_probe_device+0x94/0x178 deferred_probe_work_func+0x1a4/0x1f0 process_one_work+0x5d4/0x9dc worker_thread+0x898/0xccc kthread+0x2d4/0x3d4 ret_from_fork+0x10/0x20
-> #1 (crtc_ww_class_acquire){+.+.}-{0:0}: ww_acquire_init+0x1c4/0x2c8 drm_modeset_acquire_init+0x44/0xc8 drm_helper_probe_single_connector_modes+0xb0/0x12dc drm_mode_getconnector+0x5dc/0xfe8 drm_ioctl_kernel+0x1e4/0x338 drm_ioctl+0x3a4/0x684 __arm64_sys_ioctl+0x118/0x154 invoke_syscall+0x78/0x224 el0_svc_common+0x178/0x200 do_el0_svc+0x94/0x13c el0_svc+0x5c/0xec el0t_64_sync_handler+0x78/0x108 el0t_64_sync+0x1a4/0x1a8
-> #0 (&dev->mode_config.mutex){+.+.}-{3:3}: __lock_acquire+0x2650/0x672c lock_acquire+0x1b4/0x4ac __mutex_lock_common+0x174/0x1a64 mutex_lock_nested+0x98/0xac dp_panel_add_fail_safe_mode+0x4c/0xa0 dp_hpd_plug_handle+0x1f0/0x280 dp_bridge_enable+0x94/0x2b8 drm_atomic_bridge_chain_enable+0x11c/0x168 drm_atomic_helper_commit_modeset_enables+0x500/0x740 msm_atomic_commit_tail+0x3e4/0x748 commit_tail+0x19c/0x278 drm_atomic_helper_commit+0x1dc/0x1f0 drm_atomic_commit+0xc0/0xd8 drm_atomic_helper_set_config+0xb4/0x134 drm_mode_setcrtc+0x688/0x1248 drm_ioctl_kernel+0x1e4/0x338 drm_ioctl+0x3a4/0x684 __arm64_sys_ioctl+0x118/0x154 invoke_syscall+0x78/0x224 el0_svc_common+0x178/0x200 do_el0_svc+0x94/0x13c el0_svc+0x5c/0xec el0t_64_sync_handler+0x78/0x108 el0t_64_sync+0x1a4/0x1a8
Signed-off-by: Kuogee Hsieh quic_khsieh@quicinc.com
drivers/gpu/drm/msm/dp/dp_display.c | 6 ------ drivers/gpu/drm/msm/dp/dp_panel.c | 23 +++++++++++++---------- 2 files changed, 13 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index 92cd50f..01453db 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -555,12 +555,6 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data) mutex_unlock(&dp->event_mutex);
- /*
* add fail safe mode outside event_mutex scope* to avoid potiential circular lock with drm thread*/- dp_panel_add_fail_safe_mode(dp->dp_display.connector);
/* uevent will complete connection part */ return 0;diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c index 1aa9aa8c..23fee42 100644 --- a/drivers/gpu/drm/msm/dp/dp_panel.c +++ b/drivers/gpu/drm/msm/dp/dp_panel.c @@ -151,15 +151,6 @@ static int dp_panel_update_modes(struct drm_connector *connector, return rc; } -void dp_panel_add_fail_safe_mode(struct drm_connector *connector) -{
- /* fail safe edid */
- mutex_lock(&connector->dev->mode_config.mutex);
- if (drm_add_modes_noedid(connector, 640, 480))
drm_set_preferred_mode(connector, 640, 480);- mutex_unlock(&connector->dev->mode_config.mutex);
-}
- int dp_panel_read_sink_caps(struct dp_panel *dp_panel, struct drm_connector *connector) {
@@ -216,7 +207,11 @@ int dp_panel_read_sink_caps(struct dp_panel *dp_panel, goto end; }
dp_panel_add_fail_safe_mode(connector);
/* fail safe edid */mutex_lock(&connector->dev->mode_config.mutex);if (drm_add_modes_noedid(connector, 640, 480))drm_set_preferred_mode(connector, 640, 480);mutex_unlock(&connector->dev->mode_config.mutex); } if (panel->aux_cfg_update_done) {@@ -266,6 +261,14 @@ int dp_panel_get_modes(struct dp_panel *dp_panel, return -EINVAL; }
- /*
* add fail safe mode (640x480) here* since we are executed in drm_thread context,* no mode_config.mutex acquired required*/- if (drm_add_modes_noedid(connector, 640, 480))
drm_set_preferred_mode(connector, 640, 480);if (dp_panel->edid) return dp_panel_update_modes(connector, dp_panel->edid);Also, wouldn't calling get_modes() several times make cause adding more and more 640x480 modes to the modes list?
Shouldnt DRM be blocking that here? Call should trickle down here only if count_modes was 0
if (out_resp->count_modes == 0) { if (is_current_master) connector->funcs->fill_modes(connector, dev->mode_config.max_width, dev->mode_config.max_height); else drm_dbg_kms(dev, "User-space requested a forced probe on[CONNECTOR:%d:%s] but is not the DRM master, demoting to read-only probe", connector->base.id, connector->name); }
count_modes is set by userspace: /* * This ioctl is called twice, once to determine how much space is * needed, and the 2nd time to fill it. */
So, nothing prevents userspace from passing zero count_mode more than once.
Ack, some non-optimized usermodes can do this.
However drm_helper_probe_single_connector_modes() will set old modes to MODE_STALE and then will call get_modes(). Then drm_mode_prune_invalid() will prune stale modes. So, this should be fine.
Got it.
A more generic question is why do we need to add the mode in two places?
Answering behalf of kuogee but the two places are for different purposes:
1) When there is no EDID read
if (!dp_panel->edid) {
That case we should add the fail-safe mode as otherwise display will be blank for cases where there was nothing wrong with the monitor as such but the EDID read from aux failed for some reason. Even DRM does this but just not 640x480 here:
518 if (count == 0 && (connector->status == connector_status_connected || 519 connector->status == connector_status_unknown)) 520 count = drm_add_modes_noedid(connector, 1024, 768);
2) When there was a valid EDID but no 640x480 mode
This is the equipment specific case and the one even I was a bit surprised. There is a DP compliance equipment we have in-house and while validation, it was found that in its list of modes , it did not have any modes which chromebook supported ( due to 2 lanes ). But my understanding was that, all sinks should have atleast 640x480 but apparently this one did not have that. So to handle this DP compliance equipment behavior, we had to do this.
Thanks
Abhinav