Storing the position of the breadcrumb of the last retired request as
a separate last_retired_head is superfluous as we always copy that into
head prior to recalculation of the intel_ring.space.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 5 ++---
drivers/gpu/drm/i915/i915_gem_request.c | 2 +-
drivers/gpu/drm/i915/intel_lrc.c | 2 --
drivers/gpu/drm/i915/intel_ringbuffer.c | 21 ++++-----------------
drivers/gpu/drm/i915/intel_ringbuffer.h | 10 ----------
drivers/gpu/drm/i915/selftests/mock_engine.c | 1 -
6 files changed, 7 insertions(+), 34 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 47e707d83c4d..29bf11d8b620 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1938,9 +1938,8 @@ static int i915_gem_framebuffer_info(struct seq_file *m, void *data)
static void describe_ctx_ring(struct seq_file *m, struct intel_ring *ring)
{
- seq_printf(m, " (ringbuffer, space: %d, head: %u, tail: %u, last head: %d)",
- ring->space, ring->head, ring->tail,
- ring->last_retired_head);
+ seq_printf(m, " (ringbuffer, space: %d, head: %u, tail: %u)",
+ ring->space, ring->head, ring->tail);
}
static int i915_context_status(struct seq_file *m, void *unused)
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index 0e8d1010cecb..dbfa9db2419d 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -295,7 +295,7 @@ static void i915_gem_request_retire(struct drm_i915_gem_request *request)
* completion order.
*/
list_del(&request->ring_link);
- request->ring->last_retired_head = request->postfix;
+ request->ring->head = request->postfix;
if (!--request->i915->gt.active_requests) {
GEM_BUG_ON(!request->i915->gt.awake);
mod_delayed_work(request->i915->wq,
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index dab73e7d9a6b..29dd614aa54a 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1255,7 +1255,6 @@ static void reset_common_ring(struct intel_engine_cs *engine,
ce->lrc_reg_state[CTX_RING_HEAD+1] = request->postfix;
request->ring->head = request->postfix;
- request->ring->last_retired_head = -1;
intel_ring_update_space(request->ring);
/* Catch up with any missed context-switch interrupts */
@@ -2042,7 +2041,6 @@ void intel_lr_context_resume(struct drm_i915_private *dev_priv)
i915_gem_object_unpin_map(ce->state->obj);
ce->ring->head = ce->ring->tail = 0;
- ce->ring->last_retired_head = -1;
intel_ring_update_space(ce->ring);
}
}
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index d9b8d17c3fc6..0ca5ea7a9407 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -49,13 +49,7 @@ static int __intel_ring_space(int head, int tail, int size)
void intel_ring_update_space(struct intel_ring *ring)
{
- if (ring->last_retired_head != -1) {
- ring->head = ring->last_retired_head;
- ring->last_retired_head = -1;
- }
-
- ring->space = __intel_ring_space(ring->head & HEAD_ADDR,
- ring->tail, ring->size);
+ ring->space = __intel_ring_space(ring->head, ring->tail, ring->size);
}
static int
@@ -618,12 +612,8 @@ static void reset_ring_common(struct intel_engine_cs *engine,
}
/* If the rq hung, jump to its breadcrumb and skip the batch */
- if (request->fence.error == -EIO) {
- struct intel_ring *ring = request->ring;
-
- ring->head = request->postfix;
- ring->last_retired_head = -1;
- }
+ if (request->fence.error == -EIO)
+ request->ring->head = request->postfix;
} else {
engine->legacy_active_context = NULL;
}
@@ -1392,7 +1382,6 @@ intel_engine_create_ring(struct intel_engine_cs *engine, int size)
if (IS_I830(engine->i915) || IS_I845G(engine->i915))
ring->effective_size -= 2 * CACHELINE_BYTES;
- ring->last_retired_head = -1;
intel_ring_update_space(ring);
vma = intel_ring_create_vma(engine->i915, size);
@@ -1571,10 +1560,8 @@ void intel_legacy_submission_resume(struct drm_i915_private *dev_priv)
struct intel_engine_cs *engine;
enum intel_engine_id id;
- for_each_engine(engine, dev_priv, id) {
+ for_each_engine(engine, dev_priv, id)
engine->buffer->head = engine->buffer->tail;
- engine->buffer->last_retired_head = -1;
- }
}
static int ring_request_alloc(struct drm_i915_gem_request *request)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 847aea554464..2ecb41788fb6 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -149,16 +149,6 @@ struct intel_ring {
int space;
int size;
int effective_size;
-
- /** We track the position of the requests in the ring buffer, and
- * when each is retired we increment last_retired_head as the GPU
- * must have finished processing the request and so we know we
- * can advance the ringbuffer up to that position.
- *
- * last_retired_head is set to -1 after the value is consumed so
- * we can detect new retirements.
- */
- u32 last_retired_head;
};
struct i915_gem_context;
diff --git a/drivers/gpu/drm/i915/selftests/mock_engine.c b/drivers/gpu/drm/i915/selftests/mock_engine.c
index 8d5ba037064c..0ad624a1db90 100644
--- a/drivers/gpu/drm/i915/selftests/mock_engine.c
+++ b/drivers/gpu/drm/i915/selftests/mock_engine.c
@@ -118,7 +118,6 @@ static struct intel_ring *mock_ring(struct intel_engine_cs *engine)
ring->vaddr = (void *)(ring + 1);
INIT_LIST_HEAD(&ring->request_list);
- ring->last_retired_head = -1;
intel_ring_update_space(ring);
return ring;
--
2.11.0
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