(was: drm/vram-helper: Lock GEM BOs while they are mapped)
GEM VRAM helpers used to pin the BO in their implementation of vmap, so that they could not be relocated. In recent discussions, [1][2] it became clear that this is incorrect for in-kernel use cases, such as fbdev emulation; which should rather depend on the reservation lock to prevent relocation.
This patchset addresses the issue by introducing the new interfaces vmap_local and vunmap_local throughout dma-buf and GEM. It further adds support to DRM's CMA, SHMEM and VRAM helpers and finally converts fbdev emulation to the new interface.
Patches 1 and 2 prepare the ast cursor code for the later changes.
Patches 3 and 4 add the vmap_local infrastructure throughout dma-buf, GEM and PRIME.
Patches 5 to 7 add implementations of vmap_local to DRM's various GEM helper libraries. Due to the simple nature of these libraries, existing vmap code can be reused easily. Several drivers are updateed as well to use the new interfaces.
Patch 8 converts generic fbdev emulation to use vmap_local. Only DRM drivers that use GEM helpers currently use fbdev emulation, so patches 5 to 7 covered all necessary instances.
I smoke-tested the patchset with ast (VRAM helpers), mgag200 (SHMEM) and vc4 (CMA). I also tested with a version of radeon (raw TTM) that has been converted to generic fbdev emulation.
v3: * rewrite patchset around vmap_local v2: * make importers acquire resv locks by themselves * document dma-buf vamp/vunmap ops
[1] https://patchwork.freedesktop.org/patch/400054/?series=83765&rev=1 [2] https://patchwork.freedesktop.org/patch/405407/?series=84401&rev=2
Thomas Zimmermann (8): drm/ast: Don't pin cursor source BO explicitly during update drm/ast: Only map cursor BOs during updates dma-buf: Add vmap_local and vnumap_local operations drm/gem: Create infrastructure for GEM vmap_local drm/cma-helper: Provide a vmap function for short-term mappings drm/shmem-helper: Provide a vmap function for short-term mappings drm/vram-helper: Provide a vmap function for short-term mappings drm/fb-helper: Move BO locking from DRM client to fbdev damage worker
drivers/dma-buf/dma-buf.c | 80 ++++++++++++++ drivers/gpu/drm/ast/ast_cursor.c | 70 +++++++----- drivers/gpu/drm/ast/ast_drv.h | 2 - drivers/gpu/drm/drm_client.c | 91 ++++++++++++++++ drivers/gpu/drm/drm_fb_helper.c | 41 +++---- drivers/gpu/drm/drm_gem.c | 28 +++++ drivers/gpu/drm/drm_gem_cma_helper.c | 35 ++++++ drivers/gpu/drm/drm_gem_shmem_helper.c | 71 ++++++++++++- drivers/gpu/drm/drm_gem_vram_helper.c | 142 ++++++++++++++++--------- drivers/gpu/drm/drm_internal.h | 2 + drivers/gpu/drm/drm_prime.c | 39 +++++++ drivers/gpu/drm/mgag200/mgag200_mode.c | 16 ++- drivers/gpu/drm/tiny/cirrus.c | 10 +- drivers/gpu/drm/tiny/gm12u320.c | 14 ++- drivers/gpu/drm/udl/udl_modeset.c | 18 ++-- drivers/gpu/drm/vboxvideo/vbox_mode.c | 15 +-- drivers/gpu/drm/vc4/vc4_bo.c | 13 +++ drivers/gpu/drm/vc4/vc4_drv.h | 1 + drivers/gpu/drm/virtio/virtgpu_prime.c | 2 + include/drm/drm_client.h | 4 + include/drm/drm_gem.h | 20 ++++ include/drm/drm_gem_cma_helper.h | 1 + include/drm/drm_gem_shmem_helper.h | 2 + include/drm/drm_gem_vram_helper.h | 2 + include/drm/drm_prime.h | 2 + include/linux/dma-buf.h | 34 ++++++ 26 files changed, 635 insertions(+), 120 deletions(-)
-- 2.29.2