Before we introduce cached CPU mappings, we want a dma_buf implementation satisfying synchronization requests around CPU accesses coming from a dma_buf exported by our driver. Let's provide our own implementation relying on the default gem_shmem_prime helpers designed for that purpose.
v5: - New patch Signed-off-by: Boris Brezillon <[email protected]> --- drivers/gpu/drm/panfrost/panfrost_drv.c | 1 + drivers/gpu/drm/panfrost/panfrost_gem.c | 19 +++++++++++++++++++ drivers/gpu/drm/panfrost/panfrost_gem.h | 2 ++ 3 files changed, 22 insertions(+) diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c index 1c3c574cd64a..e3cdc0c95a56 100644 --- a/drivers/gpu/drm/panfrost/panfrost_drv.c +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c @@ -852,6 +852,7 @@ static const struct drm_driver panfrost_drm_driver = { .gem_create_object = panfrost_gem_create_object, .gem_prime_import_sg_table = panfrost_gem_prime_import_sg_table, + .gem_prime_get_dma_buf_ops = panfrost_gem_prime_get_dma_buf_ops, #ifdef CONFIG_DEBUG_FS .debugfs_init = panfrost_debugfs_init, #endif diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c b/drivers/gpu/drm/panfrost/panfrost_gem.c index 0528de674a4f..070ea7108af6 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gem.c +++ b/drivers/gpu/drm/panfrost/panfrost_gem.c @@ -323,6 +323,25 @@ panfrost_gem_create(struct drm_device *dev, size_t size, u32 flags) return bo; } +static const struct dma_buf_ops panfrost_dma_buf_ops = { + .attach = drm_gem_map_attach, + .detach = drm_gem_map_detach, + .map_dma_buf = drm_gem_shmem_prime_map_dma_buf, + .unmap_dma_buf = drm_gem_shmem_prime_unmap_dma_buf, + .release = drm_gem_dmabuf_release, + .mmap = drm_gem_dmabuf_mmap, + .vmap = drm_gem_dmabuf_vmap, + .vunmap = drm_gem_dmabuf_vunmap, + .begin_cpu_access = drm_gem_shmem_prime_begin_cpu_access, + .end_cpu_access = drm_gem_shmem_prime_end_cpu_access, +}; + +const struct dma_buf_ops * +panfrost_gem_prime_get_dma_buf_ops(struct drm_device *dev) +{ + return &panfrost_dma_buf_ops; +} + struct drm_gem_object * panfrost_gem_prime_import_sg_table(struct drm_device *dev, struct dma_buf_attachment *attach, diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.h b/drivers/gpu/drm/panfrost/panfrost_gem.h index 8de3e76f2717..c63264464271 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gem.h +++ b/drivers/gpu/drm/panfrost/panfrost_gem.h @@ -130,6 +130,8 @@ struct drm_gem_object * panfrost_gem_prime_import_sg_table(struct drm_device *dev, struct dma_buf_attachment *attach, struct sg_table *sgt); +const struct dma_buf_ops * +panfrost_gem_prime_get_dma_buf_ops(struct drm_device *dev); struct panfrost_gem_object * panfrost_gem_create(struct drm_device *dev, size_t size, u32 flags); -- 2.51.0
