On 19/04/16 16:08, Dave Gordon wrote:
From: Alex Dai <yu.dai@xxxxxxxxx>
Now that we keep the GuC client process descriptor permanently mapped,
we don't really need to keep a local copy of the GuC's work-queue-head.
So we can simplify the code a little by not doing this.
Signed-off-by: Alex Dai <yu.dai@xxxxxxxxx>
Signed-off-by: Dave Gordon <david.s.gordon@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_guc_submission.c | 16 ++++------------
drivers/gpu/drm/i915/intel_guc.h | 2 +-
2 files changed, 5 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index d251699..4718b7a 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -238,9 +238,6 @@ static int guc_ring_doorbell(struct i915_guc_client *gc)
db_exc.cookie = 1;
}
- /* Finally, update the cached copy of the GuC's WQ head */
- gc->wq_head = desc->head;
-
return ret;
}
@@ -465,17 +462,10 @@ int i915_guc_wq_check_space(struct i915_guc_client *gc)
if (!gc)
return 0;
- /* Quickly return if wq space is available since last time we cache the
- * head position. */
- if (CIRC_SPACE(gc->wq_tail, gc->wq_head, gc->wq_size) >= size)
- return 0;
-
desc = gc->client_base + gc->proc_desc_offset;
while (timeout_counter-- > 0) {
- gc->wq_head = desc->head;
-
- if (CIRC_SPACE(gc->wq_tail, gc->wq_head, gc->wq_size) >= size) {
+ if (CIRC_SPACE(gc->wq_tail, desc->head, gc->wq_size) >= size) {
ret = 0;
break;
}
@@ -490,11 +480,13 @@ int i915_guc_wq_check_space(struct i915_guc_client *gc)
static int guc_add_workqueue_item(struct i915_guc_client *gc,
struct drm_i915_gem_request *rq)
{
+ struct guc_process_desc *desc;
struct guc_wq_item *wqi;
void *base;
u32 tail, wq_len, wq_off, space;
- space = CIRC_SPACE(gc->wq_tail, gc->wq_head, gc->wq_size);
+ desc = gc->client_base + gc->proc_desc_offset;
+ space = CIRC_SPACE(gc->wq_tail, desc->head, gc->wq_size);
if (WARN_ON(space < sizeof(struct guc_wq_item)))
return -ENOSPC; /* shouldn't happen */
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 06050c241a..19ca593 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -46,7 +46,7 @@ struct i915_guc_client {
uint32_t wq_offset;
uint32_t wq_size;
uint32_t wq_tail;
- uint32_t wq_head;
+ uint32_t unused; /* Was 'wq_head' */
/* GuC submission statistics & status */
uint64_t submissions[GUC_MAX_ENGINES_NUM];
Looks OK to me, only with a disclaimer that I am not a GuC expert:
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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