Until we support p2p dma or as a complement to that, migrate data to system memory at dma-buf map time if possible.
v2: - Rebase on dynamic exporter. Update the igt_dmabuf_import_same_driver selftest to migrate if we are LMEM capable. v3: - Migrate also in the pin() callback. Signed-off-by: Thomas Hellström <thomas.hellst...@linux.intel.com> Reviewed-by: Michael J. Ruhl <michael.j.r...@intel.com> --- drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 21 +++++++++++++++++-- .../drm/i915/gem/selftests/i915_gem_dmabuf.c | 4 +++- 2 files changed, 22 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c index 918c19df7b66..13312d89c2ed 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c @@ -34,7 +34,14 @@ static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachme * Let's pin it here to avoid having to call the move_notify * callback, The call of which is not yet implemented. */ - ret = i915_gem_object_pin_pages(obj); + if (!i915_gem_object_can_migrate(obj, INTEL_REGION_SMEM)) + return ERR_PTR(-EOPNOTSUPP); + + ret = i915_gem_object_migrate(obj, NULL, INTEL_REGION_SMEM); + if (!ret) + ret = i915_gem_object_wait_migration(obj, 0); + if (!ret) + ret = i915_gem_object_pin_pages(obj); if (ret) goto err; @@ -180,9 +187,19 @@ static int i915_gem_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direct static int i915_gem_dmabuf_pin(struct dma_buf_attachment *attach) { struct drm_i915_gem_object *obj = dma_buf_to_obj(attach->dmabuf); + int ret; assert_object_held(obj); - return i915_gem_object_pin_pages(obj); + + if (!i915_gem_object_can_migrate(obj, INTEL_REGION_SMEM)) + return -EOPNOTSUPP; + ret = i915_gem_object_migrate(obj, NULL, INTEL_REGION_SMEM); + if (!ret) + ret = i915_gem_object_wait_migration(obj, 0); + if (!ret) + ret = i915_gem_object_pin_pages(obj); + + return ret; } static void i915_gem_dmabuf_unpin(struct dma_buf_attachment *attach) diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c index 868b3469ecbd..b1e87ec08741 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c @@ -106,7 +106,9 @@ static int igt_dmabuf_import_same_driver(void *arg) int err; force_different_devices = true; - obj = i915_gem_object_create_shmem(i915, PAGE_SIZE); + obj = i915_gem_object_create_lmem(i915, PAGE_SIZE, 0); + if (IS_ERR(obj)) + obj = i915_gem_object_create_shmem(i915, PAGE_SIZE); if (IS_ERR(obj)) goto out_ret; -- 2.31.1