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
Maxime Ripard (64): 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: Introduce drmm_connector_init drm/connector: Introduce drmm_connector_init_with_ddc drm/writeback: Introduce drmm_writeback_connector_init drm/simple: Introduce drmm_simple_encoder_init drm/bridge: panel: Introduce drmm_panel_bridge_add drm/bridge: panel: Introduce drmm_of_get_bridge drm/vc4: Call component_unbind_all() 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: 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: 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: Switch to DRM-managed writeback initialization 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: 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 | 186 +++++-- drivers/gpu/drm/drm_crtc.c | 70 ++- drivers/gpu/drm/drm_encoder.c | 48 +- drivers/gpu/drm/drm_mipi_dsi.c | 1 + drivers/gpu/drm/drm_simple_kms_helper.c | 46 +- drivers/gpu/drm/drm_writeback.c | 136 +++-- drivers/gpu/drm/vc4/vc4_bo.c | 33 +- drivers/gpu/drm/vc4/vc4_crtc.c | 69 ++- drivers/gpu/drm/vc4/vc4_debugfs.c | 71 ++- drivers/gpu/drm/vc4/vc4_dpi.c | 131 ++--- drivers/gpu/drm/vc4/vc4_drv.c | 18 +- drivers/gpu/drm/vc4/vc4_drv.h | 47 +- drivers/gpu/drm/vc4/vc4_dsi.c | 120 +++-- drivers/gpu/drm/vc4/vc4_gem.c | 10 +- drivers/gpu/drm/vc4/vc4_hdmi.c | 637 +++++++++++++++++------- drivers/gpu/drm/vc4/vc4_hdmi.h | 3 +- drivers/gpu/drm/vc4/vc4_hvs.c | 145 +++++- 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 | 69 +-- 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 + include/drm/drm_simple_kms_helper.h | 3 + include/drm/drm_writeback.h | 5 + 30 files changed, 1621 insertions(+), 645 deletions(-)