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/panthor/panthor_drv.c | 1 + drivers/gpu/drm/panthor/panthor_gem.c | 19 +++++++++++++++++++ drivers/gpu/drm/panthor/panthor_gem.h | 3 +++ 3 files changed, 23 insertions(+) diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c index fb4b293f17f0..99a4534c0074 100644 --- a/drivers/gpu/drm/panthor/panthor_drv.c +++ b/drivers/gpu/drm/panthor/panthor_drv.c @@ -1618,6 +1618,7 @@ static const struct drm_driver panthor_drm_driver = { .gem_create_object = panthor_gem_create_object, .gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table, + .gem_prime_get_dma_buf_ops = panthor_gem_prime_get_dma_buf_ops, #ifdef CONFIG_DEBUG_FS .debugfs_init = panthor_debugfs_init, #endif diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/panthor/panthor_gem.c index 156c7a0b62a2..160692e45f44 100644 --- a/drivers/gpu/drm/panthor/panthor_gem.c +++ b/drivers/gpu/drm/panthor/panthor_gem.c @@ -191,6 +191,25 @@ panthor_kernel_bo_create(struct panthor_device *ptdev, struct panthor_vm *vm, return ERR_PTR(ret); } +static const struct dma_buf_ops panthor_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 * +panthor_gem_prime_get_dma_buf_ops(struct drm_device *dev) +{ + return &panthor_dma_buf_ops; +} + static struct dma_buf * panthor_gem_prime_export(struct drm_gem_object *obj, int flags) { diff --git a/drivers/gpu/drm/panthor/panthor_gem.h b/drivers/gpu/drm/panthor/panthor_gem.h index 80c6e24112d0..528088839468 100644 --- a/drivers/gpu/drm/panthor/panthor_gem.h +++ b/drivers/gpu/drm/panthor/panthor_gem.h @@ -147,6 +147,9 @@ panthor_gem_create_with_handle(struct drm_file *file, void panthor_gem_bo_set_label(struct drm_gem_object *obj, const char *label); void panthor_gem_kernel_bo_set_label(struct panthor_kernel_bo *bo, const char *label); +const struct dma_buf_ops * +panthor_gem_prime_get_dma_buf_ops(struct drm_device *dev); + static inline u64 panthor_kernel_bo_gpuva(struct panthor_kernel_bo *bo) { -- 2.51.0
