From: Alex Dai <yu.dai@xxxxxxxxx>
Split GuC work queue space reserve from submission and move it to
ring_alloc_request_extras. The reason is that failure in later
i915_add_request() won't be handled. In the case timeout happens,
driver can return early in order to handle the error.
v1: Move wq_reserve_space to ring_reserve_space
v2: Move wq_reserve_space to alloc_request_extras (Chris Wilson)
Signed-off-by: Alex Dai <yu.dai@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_guc_submission.c | 21 +++++++++------------
drivers/gpu/drm/i915/intel_guc.h | 1 +
drivers/gpu/drm/i915/intel_lrc.c | 6 ++++++
3 files changed, 16 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 226e9c0..f7bd038 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -472,25 +472,21 @@ static void guc_fini_ctx_desc(struct intel_guc *guc,
sizeof(desc) * client->ctx_index);
}
-/* Get valid workqueue item and return it back to offset */
-static int guc_get_workqueue_space(struct i915_guc_client *gc, u32 *offset)
+int i915_guc_wq_reserve_space(struct i915_guc_client *gc)
{
struct guc_process_desc *desc;
void *base;
u32 size = sizeof(struct guc_wq_item);
int ret = -ETIMEDOUT, timeout_counter = 200;
+ if (!gc)
+ return 0;
+
base = kmap_atomic(i915_gem_object_get_page(gc->client_obj, 0));
desc = base + gc->proc_desc_offset;
while (timeout_counter-- > 0) {
if (CIRC_SPACE(gc->wq_tail, desc->head, gc->wq_size) >= size) {
- *offset = gc->wq_tail;
-
- /* advance the tail for next workqueue item */
- gc->wq_tail += size;
- gc->wq_tail &= gc->wq_size - 1;
-
/* this will break the loop */
timeout_counter = 0;
ret = 0;
@@ -512,11 +508,12 @@ static int guc_add_workqueue_item(struct i915_guc_client *gc,
struct guc_wq_item *wqi;
void *base;
u32 tail, wq_len, wq_off = 0;
- int ret;
- ret = guc_get_workqueue_space(gc, &wq_off);
- if (ret)
- return ret;
+ wq_off = gc->wq_tail;
+
+ /* advance the tail for next workqueue item */
+ gc->wq_tail += sizeof(struct guc_wq_item);
+ gc->wq_tail &= gc->wq_size - 1;
/* For now workqueue item is 4 DWs; workqueue buffer is 2 pages. So we
* should not have the case where structure wqi is across page, neither
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 0e048bf..59c8e21 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -123,5 +123,6 @@ int i915_guc_submit(struct i915_guc_client *client,
struct drm_i915_gem_request *rq);
void i915_guc_submission_disable(struct drm_device *dev);
void i915_guc_submission_fini(struct drm_device *dev);
+int i915_guc_wq_reserve_space(struct i915_guc_client *client);
#endif
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index f96fb51..7d53d27 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -667,6 +667,12 @@ int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request
return ret;
}
+ /* Reserve GuC WQ space here (one request needs one WQ item) because
+ * the later i915_add_request() call can't fail. */
+ ret = i915_guc_wq_reserve_space(request->i915->guc.execbuf_client);
+ if (ret)
+ return ret;
+
return 0;
}
--
2.5.0
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