No subject

[Rob Herring]

Subject: [PATCH v2 0/8] panfrost: Locking and runtime PM fixes

With further testing of recent changes with lockdep and other locking
checks enabled, we've found several bugs in the shrinker code and one
sleep while atomic in panfrost_gem_open(). This series addresses those
issues.

Delaying the unmapping of pages turns out to be a bad idea. Instead we 
need to rework panfrost_mmu_unmap() to not do a runtime PM resume which 
takes several locks and causes more lockdep warnings. Unfortunately, 
there initially appeared to be some mismatches between the runtime PM 
state and the h/w. The result is several fixes to the runtime PM 
initialization and handling in jobs. With this, the changes to 
panfrost_mmu_unmap() are working correctly.

v2:
 - Drop already applied 'drm/panfrost: Fix sleeping while atomic in 
   panfrost_gem_open'
 - Runtime PM clean-ups
 - Keep panfrost_gem_purge and use mutex_trylock there
 - Rework panfrost_mmu_unmap runtime PM

Rob

Rob Herring (8):
  drm/panfrost: Fix possible suspend in panfrost_remove
  drm/panfrost: Rework runtime PM initialization
  drm/panfrost: Hold runtime PM reference until jobs complete
  drm/shmem: Do dma_unmap_sg before purging pages
  drm/shmem: Use mutex_trylock in drm_gem_shmem_purge
  drm/panfrost: Use mutex_trylock in panfrost_gem_purge
  drm/panfrost: Rework page table flushing and runtime PM interaction
  drm/panfrost: Remove unnecessary flushing from tlb_inv_context

 drivers/gpu/drm/drm_gem_shmem_helper.c        | 13 ++++-
 drivers/gpu/drm/panfrost/panfrost_device.c    |  9 ----
 drivers/gpu/drm/panfrost/panfrost_drv.c       | 16 ++++---
 .../gpu/drm/panfrost/panfrost_gem_shrinker.c  | 11 +++--
 drivers/gpu/drm/panfrost/panfrost_job.c       | 16 ++++---
 drivers/gpu/drm/panfrost/panfrost_mmu.c       | 47 +++++++++----------
 include/drm/drm_gem_shmem_helper.h            |  2 +-
 7 files changed, 59 insertions(+), 55 deletions(-)

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2.20.1