[PATCH v2 0/6] drm/v3d: General job locking improvements + race-condition fixes

["Maíra Canal" <mcanal@igalia.com>]

This patch series was initially motivated by a race condition (exposed
in PATCH 4/6) where we lacked synchronization for `job->file` access.
This led to use-after-free issues when a file descriptor was closed
while a job was still running.

However, beyond fixing this specific race, the series introduces
broader improvements to active job management and locking. While PATCH
1/6, 2/6, and 5/6 are primarily code refactors, PATCH 3/6 brings a
significant change to the locking scheme. Previously, all queues shared
the same spinlock, which caused unnecessary contention during high GPU
usage across different queues. PATCH 3/6 allows queues to operate more
independently.

Finally, PATCH 6/6 addresses a similar race condition to PATCH 4/6, but
this time, on the per-file descriptor reset counter.

Best Regards,
- Maíra

---
v1 -> v2:

- Rebase on top of drm-misc-next.
- Link to v1: https://lore.kernel.org/r/20250719-v3d-queue-lock-v1-0-bcc61210f1e5@igalia.com

---
Maíra Canal (6):
      drm/v3d: Store a pointer to `struct v3d_file_priv` inside each job
      drm/v3d: Store the active job inside the queue's state
      drm/v3d: Replace a global spinlock with a per-queue spinlock
      drm/v3d: Address race-condition between per-fd GPU stats and fd release
      drm/v3d: Synchronous operations can't timeout
      drm/v3d: Protect per-fd reset counter against fd release

 drivers/gpu/drm/v3d/v3d_drv.c    | 14 ++++++-
 drivers/gpu/drm/v3d/v3d_drv.h    | 22 ++++-------
 drivers/gpu/drm/v3d/v3d_fence.c  | 11 +++---
 drivers/gpu/drm/v3d/v3d_gem.c    | 10 ++---
 drivers/gpu/drm/v3d/v3d_irq.c    | 68 +++++++++++++-------------------
 drivers/gpu/drm/v3d/v3d_sched.c  | 83 +++++++++++++++++++++-------------------
 drivers/gpu/drm/v3d/v3d_submit.c |  2 +-
 7 files changed, 104 insertions(+), 106 deletions(-)
---
base-commit: f9c67b019bc3c0324ee42c0dbfbb2d55726d751e
change-id: 20250718-v3d-queue-lock-59babfb548bc