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Date: Tue, 18 Oct 2022 15:49:15 +0300
From: Dmitry Osipenko <dmitry.osipenko@...labora.com>
To: Christian König <christian.koenig@....com>,
David Airlie <airlied@...ux.ie>,
Gerd Hoffmann <kraxel@...hat.com>,
Gurchetan Singh <gurchetansingh@...omium.org>,
Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Daniel Almeida <daniel.almeida@...labora.com>,
Gert Wollny <gert.wollny@...labora.com>,
Gustavo Padovan <gustavo.padovan@...labora.com>,
Daniel Stone <daniel@...ishbar.org>,
Tomeu Vizoso <tomeu.vizoso@...labora.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Rob Clark <robdclark@...il.com>,
Sumit Semwal <sumit.semwal@...aro.org>,
"Pan, Xinhui" <Xinhui.Pan@....com>,
Thierry Reding <thierry.reding@...il.com>,
Tomasz Figa <tfiga@...omium.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Alex Deucher <alexander.deucher@....com>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
Thomas Hellström <thomas_os@...pmail.org>,
Qiang Yu <yuq825@...il.com>,
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
Amol Maheshwari <amahesh@....qualcomm.com>,
Jason Gunthorpe <jgg@...pe.ca>,
Leon Romanovsky <leon@...nel.org>,
Juergen Gross <jgross@...e.com>,
Stefano Stabellini <sstabellini@...nel.org>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
Tomi Valkeinen <tomba@...nel.org>,
Russell King <linux@...linux.org.uk>,
Lucas Stach <l.stach@...gutronix.de>,
Christian Gmeiner <christian.gmeiner@...il.com>,
Ruhl Michael J <michael.j.ruhl@...el.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
Dmitry Osipenko <digetx@...il.com>,
linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
amd-gfx@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
kernel@...labora.com, virtualization@...ts.linux-foundation.org,
linux-rdma@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v7 00/21] Move all drivers to a common dma-buf locking
convention
On 10/18/22 14:34, Christian König wrote:
> Am 18.10.22 um 01:07 schrieb Dmitry Osipenko:
>> On 10/17/22 20:22, Dmitry Osipenko wrote:
>>> 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, Tegra, udmabuf, AMDGPU and Nouveau drivers. I tested
>>> cases
>>> of display+GPU, display+V4L and GPU+V4L dma-buf sharing (where
>>> appropriate),
>>> which covers majority of kernel drivers since rest of the drivers share
>>> same or similar code paths.
>>>
>>> Changelog:
>>>
>>> v7: - Rebased on top of recent drm-misc-next.
>>>
>>> - Added ack from Jason Gunthorpe to the RDMA patch.
>>>
>>> - Added iosys_map_clear() to dma_buf_vmap_unlocked(), making it
>>> fully
>>> consistent with dma_buf_vmap().
>>>
>>> v6: - Added r-b from Michael Ruhl to the i915 patch.
>>>
>>> - Added acks from Sumit Semwal and updated commit message of the
>>> "Move dma_buf_vmap() to dynamic locking specification" patch like
>>> was suggested by Sumit.
>>>
>>> - Added "!dmabuf" check to dma_buf_vmap_unlocked() to match the
>>> locked
>>> variant of the function, for consistency.
>>>
>>> v5: - Added acks and r-bs that were given to v4.
>>>
>>> - Changed i915 preparation patch like was suggested by Michael
>>> Ruhl.
>>> The scope of reservation locking is smaller now.
>>>
>>> v4: - Added dma_buf_mmap() to the "locking convention" documentation,
>>> which was missed by accident in v3.
>>>
>>> - Added acks from Christian König, Tomasz Figa and Hans Verkuil
>>> that
>>> they gave to couple v3 patches.
>>>
>>> - Dropped the "_unlocked" postfix from function names that don't
>>> have
>>> the locked variant, as was requested by Christian König.
>>>
>>> - Factored out the per-driver preparations into separate patches
>>> to ease reviewing of the changes, which is now doable without the
>>> global dma-buf functions renaming.
>>>
>>> - Factored out the dynamic locking convention enforcements into
>>> separate
>>> patches which add the final dma_resv_assert_held(dmabuf->resv)
>>> to the
>>> dma-buf API functions.
>>>
>>> v3: - Factored out dma_buf_mmap_unlocked() and attachment functions
>>> into aseparate patches, like was suggested by Christian König.
>>>
>>> - Corrected and factored out dma-buf locking documentation into
>>> a separate patch, like was suggested by Christian König.
>>>
>>> - Intel driver dropped the reservation locking fews days ago from
>>> its BO-release code path, but we need that locking for the
>>> imported
>>> GEMs because in the end that code path unmaps the imported GEM.
>>> So I added back the locking needed by the imported GEMs, updating
>>> the "dma-buf attachment locking specification" patch
>>> appropriately.
>>>
>>> - Tested Nouveau+Intel dma-buf import/export combo.
>>>
>>> - Tested udmabuf import to i915/Nouveau/AMDGPU.
>>>
>>> - Fixed few places in Etnaviv, Panfrost and Lima drivers that I
>>> missed
>>> to switch to locked dma-buf vmapping in the drm/gem: Take
>>> reservation
>>> lock for vmap/vunmap operations" patch. In a result
>>> invalidated the
>>> Christian's r-b that he gave to v2.
>>>
>>> - Added locked dma-buf vmap/vunmap functions that are needed for
>>> fixing
>>> vmappping of Etnaviv, Panfrost and Lima drivers mentioned above.
>>> I actually had this change stashed for the drm-shmem shrinker
>>> patchset,
>>> but then realized that it's already needed by the dma-buf
>>> patches.
>>> Also improved my tests to better cover these code paths.
>>>
>>> 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 (21):
>>> dma-buf: Add unlocked variant of vmapping functions
>>> dma-buf: Add unlocked variant of attachment-mapping functions
>>> drm/gem: Take reservation lock for vmap/vunmap operations
>>> drm/prime: Prepare to dynamic dma-buf locking specification
>>> drm/armada: Prepare to dynamic dma-buf locking specification
>>> drm/i915: Prepare to dynamic dma-buf locking specification
>>> drm/omapdrm: Prepare to dynamic dma-buf locking specification
>>> drm/tegra: Prepare to dynamic dma-buf locking specification
>>> drm/etnaviv: Prepare to dynamic dma-buf locking specification
>>> RDMA/umem: Prepare to dynamic dma-buf locking specification
>>> misc: fastrpc: Prepare to dynamic dma-buf locking specification
>>> xen/gntdev: Prepare to dynamic dma-buf locking specification
>>> media: videobuf2: Prepare to dynamic dma-buf locking specification
>>> media: tegra-vde: Prepare to dynamic dma-buf locking specification
>>> dma-buf: Move dma_buf_vmap() to dynamic locking specification
>>> dma-buf: Move dma_buf_attach() to dynamic locking specification
>>> dma-buf: Move dma_buf_map_attachment() to dynamic locking
>>> specification
>>> dma-buf: Move dma_buf_mmap() to dynamic locking specification
>>> dma-buf: Document dynamic locking convention
>>> media: videobuf2: Stop using internal dma-buf lock
>>> dma-buf: Remove obsoleted internal lock
>>>
>>> Documentation/driver-api/dma-buf.rst | 6 +
>>> drivers/dma-buf/dma-buf.c | 216 +++++++++++++++---
>>> drivers/gpu/drm/armada/armada_gem.c | 8 +-
>>> drivers/gpu/drm/drm_client.c | 4 +-
>>> drivers/gpu/drm/drm_gem.c | 24 ++
>>> drivers/gpu/drm/drm_gem_dma_helper.c | 6 +-
>>> drivers/gpu/drm/drm_gem_framebuffer_helper.c | 6 +-
>>> drivers/gpu/drm/drm_gem_ttm_helper.c | 9 +-
>>> drivers/gpu/drm/drm_prime.c | 6 +-
>>> drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c | 2 +-
>>> drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 2 +-
>>> drivers/gpu/drm/i915/gem/i915_gem_object.c | 14 ++
>>> .../drm/i915/gem/selftests/i915_gem_dmabuf.c | 16 +-
>>> drivers/gpu/drm/lima/lima_sched.c | 4 +-
>>> drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 4 +-
>>> drivers/gpu/drm/panfrost/panfrost_dump.c | 4 +-
>>> drivers/gpu/drm/panfrost/panfrost_perfcnt.c | 6 +-
>>> drivers/gpu/drm/qxl/qxl_object.c | 17 +-
>>> drivers/gpu/drm/qxl/qxl_prime.c | 4 +-
>>> drivers/gpu/drm/tegra/gem.c | 17 +-
>>> drivers/infiniband/core/umem_dmabuf.c | 7 +-
>>> .../common/videobuf2/videobuf2-dma-contig.c | 22 +-
>>> .../media/common/videobuf2/videobuf2-dma-sg.c | 19 +-
>>> .../common/videobuf2/videobuf2-vmalloc.c | 17 +-
>>> .../platform/nvidia/tegra-vde/dmabuf-cache.c | 6 +-
>>> drivers/misc/fastrpc.c | 6 +-
>>> drivers/xen/gntdev-dmabuf.c | 8 +-
>>> include/drm/drm_gem.h | 3 +
>>> include/linux/dma-buf.h | 17 +-
>>> 29 files changed, 325 insertions(+), 155 deletions(-)
>>>
>> Applied to drm-misc-next
>
> Finally! Fingers crossed that all corner cases where fixed during the
> review.
>
> But if anything shows up feel free to loop me in to help fixing things.
>
> Thanks a lot for doing this,
> Christian.
I'll ping you if anything will show up. Thank you!
--
Best regards,
Dmitry
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