lkml.org 
[lkml]   [2022]   [Jul]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v2 0/5] Move all drivers to a common dma-buf locking convention
Date
Hello,

This series moves all drivers to a dynamic dma-buf locking specification.
From now on all dma-buf importers are made responsible for holding
dma-buf's reservation lock around all operations performed over dma-bufs
in accordance to the locking specification. This allows us to utilize
reservation lock more broadly around kernel without fearing of a potential
deadlocks.

This patchset passes all i915 selftests. It was also tested using VirtIO,
Panfrost, Lima and Tegra drivers. I tested cases of display+GPU,
display+V4L and GPU+V4L dma-buf sharing, which covers majority of kernel
drivers since rest of the drivers share same or similar code paths.

Changelog:

v2: - Changed locking specification to avoid problems with a cross-driver
ww locking, like was suggested by Christian König. Now the attach/detach
callbacks are invoked without the held lock and exporter should take the
lock.

- Added "locking convention" documentation that explains which dma-buf
functions and callbacks are locked/unlocked for importers and exporters,
which was requested by Christian König.

- Added ack from Tomasz Figa to the V4L patches that he gave to v1.

Dmitry Osipenko (5):
dma-buf: Add _unlocked postfix to function names
drm/gem: Take reservation lock for vmap/vunmap operations
dma-buf: Move all dma-bufs to dynamic locking specification
media: videobuf2: Stop using internal dma-buf lock
dma-buf: Remove internal lock

Documentation/driver-api/dma-buf.rst | 6 +
drivers/dma-buf/dma-buf.c | 253 +++++++++++++-----
drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 4 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 4 +-
drivers/gpu/drm/armada/armada_gem.c | 14 +-
drivers/gpu/drm/drm_client.c | 4 +-
drivers/gpu/drm/drm_gem.c | 24 ++
drivers/gpu/drm/drm_gem_cma_helper.c | 6 +-
drivers/gpu/drm/drm_gem_framebuffer_helper.c | 6 +-
drivers/gpu/drm/drm_gem_shmem_helper.c | 6 +-
drivers/gpu/drm/drm_prime.c | 12 +-
drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c | 6 +-
drivers/gpu/drm/exynos/exynos_drm_gem.c | 2 +-
drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 14 +-
.../drm/i915/gem/selftests/i915_gem_dmabuf.c | 20 +-
drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 8 +-
drivers/gpu/drm/qxl/qxl_object.c | 17 +-
drivers/gpu/drm/qxl/qxl_prime.c | 4 +-
drivers/gpu/drm/tegra/gem.c | 27 +-
drivers/infiniband/core/umem_dmabuf.c | 11 +-
.../common/videobuf2/videobuf2-dma-contig.c | 26 +-
.../media/common/videobuf2/videobuf2-dma-sg.c | 23 +-
.../common/videobuf2/videobuf2-vmalloc.c | 17 +-
.../platform/nvidia/tegra-vde/dmabuf-cache.c | 12 +-
drivers/misc/fastrpc.c | 12 +-
drivers/xen/gntdev-dmabuf.c | 14 +-
include/drm/drm_gem.h | 3 +
include/linux/dma-buf.h | 71 ++---
28 files changed, 372 insertions(+), 254 deletions(-)

--
2.36.1

\
 
 \ /
  Last update: 2022-07-25 17:22    [W:1.980 / U:0.000 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site