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drm/i915/guc: drop cached copy of 'wq_head'

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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@intel.com>
Signed-off-by: Dave Gordon <david.s.gordon@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Alex Dai 2016-04-19 16:08:35 +01:00 committed by Tvrtko Ursulin
parent 0d92a6a4f6
commit a5916e8f54
2 changed files with 5 additions and 13 deletions
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16
drivers/gpu/drm/i915/i915_guc_submission.c
View File

@ -238,9 +238,6 @@ static int guc_ring_doorbell(struct i915_guc_client *gc)
db_exc.cookie = 1; db_exc.cookie = 1;
} }
/* Finally, update the cached copy of the GuC's WQ head */
gc->wq_head = desc->head;
return ret; return ret;
} }
@ -465,17 +462,10 @@ int i915_guc_wq_check_space(struct i915_guc_client *gc)
if (!gc) if (!gc)
return 0; 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; desc = gc->client_base + gc->proc_desc_offset;
while (timeout_counter-- > 0) { while (timeout_counter-- > 0) {
gc->wq_head = desc->head; if (CIRC_SPACE(gc->wq_tail, desc->head, gc->wq_size) >= size) {
if (CIRC_SPACE(gc->wq_tail, gc->wq_head, gc->wq_size) >= size) {
ret = 0; ret = 0;
break; 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, static int guc_add_workqueue_item(struct i915_guc_client *gc,
struct drm_i915_gem_request *rq) struct drm_i915_gem_request *rq)
{ {
struct guc_process_desc *desc;
struct guc_wq_item *wqi; struct guc_wq_item *wqi;
void *base; void *base;
u32 tail, wq_len, wq_off, space; 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))) if (WARN_ON(space < sizeof(struct guc_wq_item)))
return -ENOSPC; /* shouldn't happen */ return -ENOSPC; /* shouldn't happen */

2
drivers/gpu/drm/i915/intel_guc.h
View File

@ -46,7 +46,7 @@ struct i915_guc_client {
uint32_t wq_offset; uint32_t wq_offset;
uint32_t wq_size; uint32_t wq_size;
uint32_t wq_tail; uint32_t wq_tail;
uint32_t wq_head; uint32_t unused; /* Was 'wq_head' */
/* GuC submission statistics & status */ /* GuC submission statistics & status */
uint64_t submissions[GUC_MAX_ENGINES_NUM]; uint64_t submissions[GUC_MAX_ENGINES_NUM];