We will need to wait on DMA completion (as signaled via struct fence)
before executing our i915_gem_request. Therefore we want to expose a
method for adding the await on the fence itself to the request.
v2: Add a comment detailing a failure to handle a signal-on-any
fence-array.
v3: Pretend that magic numbers don't exist.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 3 ++
drivers/gpu/drm/i915/i915_gem.c | 2 +-
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 3 +-
drivers/gpu/drm/i915/i915_gem_request.c | 48 ++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_gem_request.h | 6 ++--
5 files changed, 58 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index a8f006e3b45d..fb1363561683 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1423,6 +1423,9 @@ struct i915_error_state_file_priv {
struct drm_i915_error_state *error;
};
+#define I915_RESET_TIMEOUT (10 * HZ) /* 10s */
+#define I915_FENCE_TIMEOUT (10 * HZ) /* 10s */
+
struct i915_gpu_error {
/* For hangcheck timer */
#define DRM_I915_HANGCHECK_PERIOD 1500 /* in ms */
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 87018df94d68..0c186b75ec86 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -114,7 +114,7 @@ i915_gem_wait_for_error(struct i915_gpu_error *error)
*/
ret = wait_event_interruptible_timeout(error->reset_queue,
!i915_reset_in_progress(error),
- 10*HZ);
+ I915_RESET_TIMEOUT);
if (ret == 0) {
DRM_ERROR("Timed out waiting for the gpu reset to complete\n");
return -EIO;
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index e52affdcc125..cdd7b3d49a41 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1142,7 +1142,8 @@ i915_gem_execbuffer_move_to_gpu(struct drm_i915_gem_request *req,
if (resv) {
ret = i915_sw_fence_await_reservation
(&req->submit, resv, &i915_fence_ops,
- obj->base.pending_write_domain, 10*HZ,
+ obj->base.pending_write_domain,
+ I915_FENCE_TIMEOUT,
GFP_KERNEL | __GFP_NOWARN);
if (ret < 0)
return ret;
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index f9af2a00625e..5e38bc04a4f0 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -23,6 +23,7 @@
*/
#include <linux/prefetch.h>
+#include <linux/dma-fence-array.h>
#include "i915_drv.h"
@@ -496,6 +497,53 @@ i915_gem_request_await_request(struct drm_i915_gem_request *to,
return 0;
}
+int
+i915_gem_request_await_dma_fence(struct drm_i915_gem_request *req,
+ struct dma_fence *fence)
+{
+ struct dma_fence_array *array;
+ int ret;
+ int i;
+
+ if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
+ return 0;
+
+ if (dma_fence_is_i915(fence))
+ return i915_gem_request_await_request(req, to_request(fence));
+
+ if (!dma_fence_is_array(fence)) {
+ ret = i915_sw_fence_await_dma_fence(&req->submit,
+ fence, I915_FENCE_TIMEOUT,
+ GFP_KERNEL);
+ return ret < 0 ? ret : 0;
+ }
+
+ /* Note that if the fence-array was created in signal-on-any mode,
+ * we should *not* decompose it into its individual fences. However,
+ * we don't currently store which mode the fence-array is operating
+ * in. Fortunately, the only user of signal-on-any is private to
+ * amdgpu and we should not see any incoming fence-array from
+ * sync-file being in signal-on-any mode.
+ */
+
+ array = to_dma_fence_array(fence);
+ for (i = 0; i < array->num_fences; i++) {
+ struct dma_fence *child = array->fences[i];
+
+ if (dma_fence_is_i915(child))
+ ret = i915_gem_request_await_request(req,
+ to_request(child));
+ else
+ ret = i915_sw_fence_await_dma_fence(&req->submit,
+ child, I915_FENCE_TIMEOUT,
+ GFP_KERNEL);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
/**
* i915_gem_request_await_object - set this request to (async) wait upon a bo
*
diff --git a/drivers/gpu/drm/i915/i915_gem_request.h b/drivers/gpu/drm/i915/i915_gem_request.h
index bceeaa3a5193..4e6d038cc9de 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.h
+++ b/drivers/gpu/drm/i915/i915_gem_request.h
@@ -147,7 +147,7 @@ struct drm_i915_gem_request {
extern const struct dma_fence_ops i915_fence_ops;
-static inline bool fence_is_i915(struct dma_fence *fence)
+static inline bool dma_fence_is_i915(const struct dma_fence *fence)
{
return fence->ops == &i915_fence_ops;
}
@@ -176,7 +176,7 @@ to_request(struct dma_fence *fence)
{
/* We assume that NULL fence/request are interoperable */
BUILD_BUG_ON(offsetof(struct drm_i915_gem_request, fence) != 0);
- GEM_BUG_ON(fence && !fence_is_i915(fence));
+ GEM_BUG_ON(fence && !dma_fence_is_i915(fence));
return container_of(fence, struct drm_i915_gem_request, fence);
}
@@ -214,6 +214,8 @@ int
i915_gem_request_await_object(struct drm_i915_gem_request *to,
struct drm_i915_gem_object *obj,
bool write);
+int i915_gem_request_await_dma_fence(struct drm_i915_gem_request *req,
+ struct dma_fence *fence);
void __i915_add_request(struct drm_i915_gem_request *req, bool flush_caches);
#define i915_add_request(req) \
--
2.10.1
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