Re: [PATCH v4 06/21] drm/i915: Prepare to dynamic dma-buf locking specification

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Am 31.08.22 um 17:37 schrieb Dmitry Osipenko:
Prepare i915 driver to the common dynamic dma-buf locking convention
by starting to use the unlocked versions of dma-buf API functions
and handling cases where importer now holds the reservation lock.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@xxxxxxxxxxxxx>

Acked-by: Christian König <christian.koenig@xxxxxxx>, but it's probably best if somebody from the Intel guys take a look as well.

---
  drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c       |  2 +-
  drivers/gpu/drm/i915/gem/i915_gem_object.c       | 12 ++++++++++++
  .../gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c | 16 ++++++++--------
  3 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
index f5062d0c6333..07eee1c09aaf 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
@@ -72,7 +72,7 @@ static int i915_gem_dmabuf_vmap(struct dma_buf *dma_buf,
  	struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
  	void *vaddr;
- vaddr = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB);
+	vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
  	if (IS_ERR(vaddr))
  		return PTR_ERR(vaddr);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
index 389e9f157ca5..7e2a9b02526c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
@@ -331,7 +331,19 @@ static void __i915_gem_free_objects(struct drm_i915_private *i915,
  			continue;
  		}
+ /*
+		 * dma_buf_unmap_attachment() requires reservation to be
+		 * locked. The imported GEM shouldn't share reservation lock,
+		 * so it's safe to take the lock.
+		 */
+		if (obj->base.import_attach)
+			i915_gem_object_lock(obj, NULL);
+
  		__i915_gem_object_pages_fini(obj);
+
+		if (obj->base.import_attach)
+			i915_gem_object_unlock(obj);
+
  		__i915_gem_free_object(obj);
/* But keep the pointer alive for RCU-protected lookups */
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 62c61af77a42..9e3ed634aa0e 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
@@ -213,7 +213,7 @@ static int igt_dmabuf_import_same_driver(struct drm_i915_private *i915,
  		goto out_import;
  	}
- st = dma_buf_map_attachment(import_attach, DMA_BIDIRECTIONAL);
+	st = dma_buf_map_attachment_unlocked(import_attach, DMA_BIDIRECTIONAL);
  	if (IS_ERR(st)) {
  		err = PTR_ERR(st);
  		goto out_detach;
@@ -226,7 +226,7 @@ static int igt_dmabuf_import_same_driver(struct drm_i915_private *i915,
  		timeout = -ETIME;
  	}
  	err = timeout > 0 ? 0 : timeout;
-	dma_buf_unmap_attachment(import_attach, st, DMA_BIDIRECTIONAL);
+	dma_buf_unmap_attachment_unlocked(import_attach, st, DMA_BIDIRECTIONAL);
  out_detach:
  	dma_buf_detach(dmabuf, import_attach);
  out_import:
@@ -296,7 +296,7 @@ static int igt_dmabuf_import(void *arg)
  		goto out_obj;
  	}
- err = dma_buf_vmap(dmabuf, &map);
+	err = dma_buf_vmap_unlocked(dmabuf, &map);
  	dma_map = err ? NULL : map.vaddr;
  	if (!dma_map) {
  		pr_err("dma_buf_vmap failed\n");
@@ -337,7 +337,7 @@ static int igt_dmabuf_import(void *arg)
err = 0;
  out_dma_map:
-	dma_buf_vunmap(dmabuf, &map);
+	dma_buf_vunmap_unlocked(dmabuf, &map);
  out_obj:
  	i915_gem_object_put(obj);
  out_dmabuf:
@@ -358,7 +358,7 @@ static int igt_dmabuf_import_ownership(void *arg)
  	if (IS_ERR(dmabuf))
  		return PTR_ERR(dmabuf);
- err = dma_buf_vmap(dmabuf, &map);
+	err = dma_buf_vmap_unlocked(dmabuf, &map);
  	ptr = err ? NULL : map.vaddr;
  	if (!ptr) {
  		pr_err("dma_buf_vmap failed\n");
@@ -367,7 +367,7 @@ static int igt_dmabuf_import_ownership(void *arg)
  	}
memset(ptr, 0xc5, PAGE_SIZE);
-	dma_buf_vunmap(dmabuf, &map);
+	dma_buf_vunmap_unlocked(dmabuf, &map);
obj = to_intel_bo(i915_gem_prime_import(&i915->drm, dmabuf));
  	if (IS_ERR(obj)) {
@@ -418,7 +418,7 @@ static int igt_dmabuf_export_vmap(void *arg)
  	}
  	i915_gem_object_put(obj);
- err = dma_buf_vmap(dmabuf, &map);
+	err = dma_buf_vmap_unlocked(dmabuf, &map);
  	ptr = err ? NULL : map.vaddr;
  	if (!ptr) {
  		pr_err("dma_buf_vmap failed\n");
@@ -435,7 +435,7 @@ static int igt_dmabuf_export_vmap(void *arg)
  	memset(ptr, 0xc5, dmabuf->size);
err = 0;
-	dma_buf_vunmap(dmabuf, &map);
+	dma_buf_vunmap_unlocked(dmabuf, &map);
  out:
  	dma_buf_put(dmabuf);
  	return err;




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