| Message ID | 20221017172229.42269-1-dmitry.osipenko@collabora.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | Move all drivers to a common dma-buf locking convention | expand |
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
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.
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!
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(-)