Hi,
Here is a series that address multiple issues when trying to unbind/rebind vc4-related devices to their drivers.
Most of these issues involve either use-after-free, improper resource liberation or similar.
It has been tested on the Pi3 and Pi4, with X and glxgears running and KASAN enabled to properly validate our memory accesses.
Pi3 isn't functional after a rebind though, with vblank timeouts occuring. I'm not quite sure why at this point, but at least the kernel doesn't completely crash now.
Let me know what you think, Maxime
---
Changes from v1: - Rebased on top on next-20220622 - Consolidated the new drmm init helpers with their alloc counterparts - Dropped the drmm writeback and simple encoder helpers - Clarified the documentation of drm_connector_unregister - Removed the drm_connector_unregister usage - Fixed a vblank timeout when unbinding - Renamed the kref functions in vc4_dsi - Collected the tags
Maxime Ripard (68): drm/mipi-dsi: Detach devices when removing the host drm/crtc: Introduce drmm_crtc_init_with_planes drm/encoder: Introduce drmm_encoder_init drm/connector: Reorder headers drm/connector: Mention the cleanup after drm_connector_init drm/connector: Clarify when drm_connector_unregister is needed drm/connector: Introduce drmm_connector_init drm/connector: Introduce drmm_connector_init_with_ddc drm/bridge: panel: Introduce drmm_panel_bridge_add drm/bridge: panel: Introduce drmm_of_get_bridge drm/vc4: drv: Call component_unbind_all() drm/vc4: drv: Use drm_dev_unplug drm/vc4: crtc: Create vblank reporting function drm/vc4: hvs: Protect device resources after removal drm/vc4: hvs: Remove planes currently allocated before taking down drm/vc4: plane: Take possible_crtcs as an argument drm/vc4: crtc: Remove manual plane removal on error drm/vc4: plane: Switch to drmm_universal_plane_alloc() drm/vc4: crtc: Move debugfs_name to crtc_data drm/vc4: crtc: Switch to drmm_kzalloc drm/vc4: crtc: Switch to DRM-managed CRTC initialization drm/vc4: dpi: Remove vc4_dev dpi pointer drm/vc4: dpi: Embed DRM structures into the private structure drm/vc4: dpi: Switch to drmm_kzalloc drm/vc4: dpi: Return an error if we can't enable our clock drm/vc4: dpi: Remove unnecessary drm_of_panel_bridge_remove call drm/vc4: dpi: Add action to disable the clock drm/vc4: dpi: Switch to DRM-managed encoder initialization drm/vc4: dpi: Switch to drmm_of_get_bridge drm/vc4: dpi: Protect device resources drm/vc4: dsi: Embed DRM structures into the private structure drm/vc4: dsi: Switch to DRM-managed encoder initialization drm/vc4: dsi: Switch to drmm_of_get_bridge drm/vc4: dsi: Fix the driver structure lifetime drm/vc4: dsi: Switch to devm_pm_runtime_enable drm/vc4: hdmi: Switch to drmm_kzalloc drm/vc4: hdmi: Remove call to drm_connector_unregister() drm/vc4: hdmi: Switch to DRM-managed encoder initialization drm/vc4: hdmi: Switch to DRM-managed connector initialization drm/vc4: hdmi: Switch to device-managed ALSA initialization drm/vc4: hdmi: Switch to device-managed CEC initialization drm/vc4: hdmi: Use a device-managed action for DDC drm/vc4: hdmi: Switch to DRM-managed kfree to build regsets drm/vc4: hdmi: Use devm to register hotplug interrupts drm/vc4: hdmi: Move audio structure offset checks drm/vc4: hdmi: Protect device resources after removal drm/vc4: hdmi: Switch to devm_pm_runtime_enable drm/vc4: txp: Remove vc4_dev txp pointer drm/vc4: txp: Remove duplicate regset drm/vc4: txp: Switch to drmm_kzalloc drm/vc4: txp: Remove call to drm_connector_unregister() drm/vc4: txp: Protect device resources drm/vc4: vec: Remove vc4_dev vec pointer drm/vc4: vec: Embed DRM structures into the private structure drm/vc4: vec: Switch to drmm_kzalloc drm/vc4: vec: Remove call to drm_connector_unregister() drm/vc4: vec: Switch to DRM-managed encoder initialization drm/vc4: vec: Switch to DRM-managed connector initialization drm/vc4: vec: Protect device resources after removal drm/vc4: vec: Switch to devm_pm_runtime_enable drm/vc4: debugfs: Protect device resources drm/vc4: debugfs: Return an error on failure drm/vc4: debugfs: Simplify debugfs registration drm/vc4: Switch to drmm_mutex_init drm/vc4: perfmon: Add missing mutex_destroy drm/vc4: v3d: Stop disabling interrupts drm/vc4: v3d: Rework the runtime_pm setup drm/vc4: v3d: Switch to devm_pm_runtime_enable
drivers/gpu/drm/bridge/panel.c | 74 ++++ drivers/gpu/drm/drm_connector.c | 196 +++++++-- drivers/gpu/drm/drm_crtc.c | 75 +++- drivers/gpu/drm/drm_encoder.c | 57 ++- drivers/gpu/drm/drm_mipi_dsi.c | 1 + drivers/gpu/drm/vc4/vc4_bo.c | 33 +- drivers/gpu/drm/vc4/vc4_crtc.c | 90 ++-- drivers/gpu/drm/vc4/vc4_debugfs.c | 71 ++-- drivers/gpu/drm/vc4/vc4_dpi.c | 131 +++--- drivers/gpu/drm/vc4/vc4_drv.c | 21 +- drivers/gpu/drm/vc4/vc4_drv.h | 47 ++- drivers/gpu/drm/vc4/vc4_dsi.c | 133 ++++-- drivers/gpu/drm/vc4/vc4_gem.c | 10 +- drivers/gpu/drm/vc4/vc4_hdmi.c | 659 ++++++++++++++++++++++-------- drivers/gpu/drm/vc4/vc4_hdmi.h | 3 +- drivers/gpu/drm/vc4/vc4_hvs.c | 138 ++++++- drivers/gpu/drm/vc4/vc4_irq.c | 2 +- drivers/gpu/drm/vc4/vc4_perfmon.c | 1 + drivers/gpu/drm/vc4/vc4_plane.c | 36 +- drivers/gpu/drm/vc4/vc4_txp.c | 55 ++- drivers/gpu/drm/vc4/vc4_v3d.c | 65 ++- drivers/gpu/drm/vc4/vc4_vec.c | 216 +++++----- include/drm/drm_bridge.h | 4 + include/drm/drm_connector.h | 9 + include/drm/drm_crtc.h | 6 + include/drm/drm_encoder.h | 5 + 26 files changed, 1514 insertions(+), 624 deletions(-)