[PATCH v2 00/68] drm/vc4: Fix hotplug for vc4

[Maxime Ripard <maxime@cerno.tech>]

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(-)

-- 
2.36.1