[PATCH 05/10] drm/i915: Remove the per-ring write list

Chris Wilson
2012-07-20T11:42:31Z

This is now handled by a global flag to ensure we emit a flush before
the next serialisation point (if we failed to queue one previously).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_drv.h | 2 --
drivers/gpu/drm/i915/i915_gem.c | 53 +---------------------------
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 7 ++--
drivers/gpu/drm/i915/intel_ringbuffer.c | 2 --
drivers/gpu/drm/i915/intel_ringbuffer.h | 9 -----
5 files changed, 3 insertions(+), 70 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 6b91755..59e3199 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -865,8 +865,6 @@ struct drm_i915_gem_object {
/** This object's place on the active/inactive lists */
struct list_head ring_list;
struct list_head mm_list;
- /** This object's place on GPU write list */
- struct list_head gpu_write_list;
/** This object's place in the batchbuffer or on the eviction list */
struct list_head exec_list;

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 5cc11158..9c3db94 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1465,7 +1465,6 @@ i915_gem_object_move_to_inactive(struct drm_i915_gem_object *obj)

list_move_tail(&obj->mm_list, &dev_priv->mm.inactive_list);

- BUG_ON(!list_empty(&obj->gpu_write_list));
BUG_ON(obj->base.write_domain & ~I915_GEM_GPU_DOMAINS);
BUG_ON(!obj->active);

@@ -1511,30 +1510,6 @@ i915_gem_object_is_purgeable(struct drm_i915_gem_object *obj)
return obj->madv == I915_MADV_DONTNEED;
}

-static void
-i915_gem_process_flushing_list(struct intel_ring_buffer *ring,
- uint32_t flush_domains)
-{
- struct drm_i915_gem_object *obj, *next;
-
- list_for_each_entry_safe(obj, next,
- &ring->gpu_write_list,
- gpu_write_list) {
- if (obj->base.write_domain & flush_domains) {
- uint32_t old_write_domain = obj->base.write_domain;
-
- obj->base.write_domain = 0;
- list_del_init(&obj->gpu_write_list);
- i915_gem_object_move_to_active(obj, ring,
- i915_gem_next_request_seqno(ring));
-
- trace_i915_gem_object_change_domain(obj,
- obj->base.read_domains,
- old_write_domain);
- }
- }
-}
-
static u32
i915_gem_get_seqno(struct drm_device *dev)
{
@@ -1637,8 +1612,6 @@ i915_add_request(struct intel_ring_buffer *ring,
&dev_priv->mm.retire_work, HZ);
}

- WARN_ON(!list_empty(&ring->gpu_write_list));
-
return 0;
}

@@ -1680,7 +1653,6 @@ static void i915_gem_reset_ring_lists(struct drm_i915_private *dev_priv,
struct drm_i915_gem_object,
ring_list);

- list_del_init(&obj->gpu_write_list);
i915_gem_object_move_to_inactive(obj);
}
}
@@ -2011,11 +1983,6 @@ i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj,
u32 seqno;
int ret;

- /* This function only exists to support waiting for existing rendering,
- * not for emitting required flushes.
- */
- BUG_ON((obj->base.write_domain & I915_GEM_GPU_DOMAINS) != 0);
-
/* If there is rendering queued on the buffer being evicted, wait for
* it.
*/
@@ -2308,26 +2275,14 @@ i915_gem_flush_ring(struct intel_ring_buffer *ring,
if (ret)
return ret;

- if (flush_domains & I915_GEM_GPU_DOMAINS)
- i915_gem_process_flushing_list(ring, flush_domains);
-
return 0;
}

static int i915_ring_idle(struct intel_ring_buffer *ring)
{
- int ret;
-
- if (list_empty(&ring->gpu_write_list) && list_empty(&ring->active_list))
+ if (list_empty(&ring->active_list))
return 0;

- if (!list_empty(&ring->gpu_write_list)) {
- ret = i915_gem_flush_ring(ring,
- I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
- if (ret)
- return ret;
- }
-
return i915_wait_seqno(ring, i915_gem_next_request_seqno(ring));
}

@@ -2343,10 +2298,6 @@ int i915_gpu_idle(struct drm_device *dev)
if (ret)
return ret;

- /* Is the device fubar? */
- if (WARN_ON(!list_empty(&ring->gpu_write_list)))
- return -EBUSY;
-
ret = i915_switch_context(ring, NULL, DEFAULT_CONTEXT_ID);
if (ret)
return ret;
@@ -3491,7 +3442,6 @@ struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev,
INIT_LIST_HEAD(&obj->gtt_list);
INIT_LIST_HEAD(&obj->ring_list);
INIT_LIST_HEAD(&obj->exec_list);
- INIT_LIST_HEAD(&obj->gpu_write_list);
obj->madv = I915_MADV_WILLNEED;
/* Avoid an unnecessary call to unbind on the first bind. */
obj->map_and_fenceable = true;
@@ -3912,7 +3862,6 @@ init_ring_lists(struct intel_ring_buffer *ring)
{
INIT_LIST_HEAD(&ring->active_list);
INIT_LIST_HEAD(&ring->request_list);
- INIT_LIST_HEAD(&ring->gpu_write_list);
}

void
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index c08229f..86aead4 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -943,9 +943,8 @@ i915_gem_execbuffer_move_to_active(struct list_head *objects,
struct drm_i915_gem_object *obj;

list_for_each_entry(obj, objects, exec_list) {
- u32 old_read = obj->base.read_domains;
- u32 old_write = obj->base.write_domain;
-
+ u32 old_read = obj->base.read_domains;
+ u32 old_write = obj->base.write_domain;

obj->base.read_domains = obj->base.pending_read_domains;
obj->base.write_domain = obj->base.pending_write_domain;
@@ -955,8 +954,6 @@ i915_gem_execbuffer_move_to_active(struct list_head *objects,
if (obj->base.write_domain) {
obj->dirty = 1;
obj->last_write_seqno = seqno;
- list_move_tail(&obj->gpu_write_list,
- &ring->gpu_write_list);
if (obj->pin_count) /* check for potential scanout */
intel_mark_busy(ring->dev, obj);
}
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index bf0195a..8f221d9 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1002,7 +1002,6 @@ static int intel_init_ring_buffer(struct drm_device *dev,
ring->dev = dev;
INIT_LIST_HEAD(&ring->active_list);
INIT_LIST_HEAD(&ring->request_list);
- INIT_LIST_HEAD(&ring->gpu_write_list);
ring->size = 32 * PAGE_SIZE;

init_waitqueue_head(&ring->irq_queue);
@@ -1473,7 +1472,6 @@ int intel_render_ring_init_dri(struct drm_device *dev, u64 start, u32 size)
ring->dev = dev;
INIT_LIST_HEAD(&ring->active_list);
INIT_LIST_HEAD(&ring->request_list);
- INIT_LIST_HEAD(&ring->gpu_write_list);

ring->size = size;
ring->effective_size = ring->size;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 1d3c81f..7986f30 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -101,15 +101,6 @@ struct intel_ring_buffer {
struct list_head request_list;

/**
- * List of objects currently pending a GPU write flush.
- *
- * All elements on this list will belong to either the
- * active_list or flushing_list, last_rendering_seqno can
- * be used to differentiate between the two elements.
- */
- struct list_head gpu_write_list;
-
- /**
* Do we have some not yet emitted requests outstanding?
*/
u32 outstanding_lazy_request;
--
1.7.10.4