[PATCH 16/31] drm/i915: Use VMA for ringbuffer tracking
Chris Wilson
chris at chris-wilson.co.uk
Sun Aug 7 07:33:46 UTC 2016
Use the GGTT VMA as the primary cookie for handing ring objects as
the most common action upon the ring is mapping and unmapping which act
upon the VMA itself. By restructuring the code to work with the ring
VMA, we can shrink the code and remove a few cycles from context pinning.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_debugfs.c | 2 +-
drivers/gpu/drm/i915/i915_gpu_error.c | 2 +-
drivers/gpu/drm/i915/i915_guc_submission.c | 16 ++--
drivers/gpu/drm/i915/intel_ringbuffer.c | 140 +++++++++++++----------------
drivers/gpu/drm/i915/intel_ringbuffer.h | 4 +-
5 files changed, 71 insertions(+), 93 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index ee65293a5256..fda8acbf97a4 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -420,7 +420,7 @@ static int per_file_ctx_stats(int id, void *ptr, void *data)
if (ctx->engine[n].state)
per_file_stats(0, ctx->engine[n].state->obj, data);
if (ctx->engine[n].ring)
- per_file_stats(0, ctx->engine[n].ring->obj, data);
+ per_file_stats(0, ctx->engine[n].ring->vma->obj, data);
}
return 0;
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 21a4d0220c17..c9abb0ca40ea 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1102,7 +1102,7 @@ static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
ee->cpu_ring_tail = ring->tail;
ee->ringbuffer =
i915_error_ggtt_object_create(dev_priv,
- ring->obj);
+ ring->vma->obj);
}
ee->hws_page =
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 71d1d81470ee..dd42dd510b79 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -343,7 +343,7 @@ static void guc_init_ctx_desc(struct intel_guc *guc,
for_each_engine(engine, dev_priv) {
struct intel_context *ce = &ctx->engine[engine->id];
struct guc_execlist_context *lrc = &desc.lrc[engine->guc_id];
- struct drm_i915_gem_object *obj;
+ struct i915_vma *vma;
/* TODO: We have a design issue to be solved here. Only when we
* receive the first batch, we know which engine is used by the
@@ -358,17 +358,15 @@ static void guc_init_ctx_desc(struct intel_guc *guc,
lrc->context_desc = lower_32_bits(ce->lrc_desc);
/* The state page is after PPHWSP */
- gfx_addr = ce->state->node.start;
- lrc->ring_lcra = gfx_addr + LRC_STATE_PN * PAGE_SIZE;
+ vma = ce->state;
+ lrc->ring_lcra = vma->node.start + LRC_STATE_PN * PAGE_SIZE;
lrc->context_id = (client->ctx_index << GUC_ELC_CTXID_OFFSET) |
(engine->guc_id << GUC_ELC_ENGINE_OFFSET);
- obj = ce->ring->obj;
- gfx_addr = i915_gem_obj_ggtt_offset(obj);
-
- lrc->ring_begin = gfx_addr;
- lrc->ring_end = gfx_addr + obj->base.size - 1;
- lrc->ring_next_free_location = gfx_addr;
+ vma = ce->ring->vma;
+ lrc->ring_begin = vma->node.start;
+ lrc->ring_end = vma->node.start + vma->node.size - 1;
+ lrc->ring_next_free_location = lrc->ring_begin;
lrc->ring_current_tail_pointer_value = 0;
desc.engines_used |= (1 << engine->guc_id);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index f24e4e83afd7..adf3be93edc7 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -531,7 +531,6 @@ static int init_ring_common(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
struct intel_ring *ring = engine->buffer;
- struct drm_i915_gem_object *obj = ring->obj;
int ret = 0;
intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
@@ -571,7 +570,7 @@ static int init_ring_common(struct intel_engine_cs *engine)
* registers with the above sequence (the readback of the HEAD registers
* also enforces ordering), otherwise the hw might lose the new ring
* register values. */
- I915_WRITE_START(engine, i915_gem_obj_ggtt_offset(obj));
+ I915_WRITE_START(engine, ring->vma->node.start);
/* WaClearRingBufHeadRegAtInit:ctg,elk */
if (I915_READ_HEAD(engine))
@@ -586,16 +585,16 @@ static int init_ring_common(struct intel_engine_cs *engine)
/* If the head is still not zero, the ring is dead */
if (wait_for((I915_READ_CTL(engine) & RING_VALID) != 0 &&
- I915_READ_START(engine) == i915_gem_obj_ggtt_offset(obj) &&
+ I915_READ_START(engine) == ring->vma->node.start &&
(I915_READ_HEAD(engine) & HEAD_ADDR) == 0, 50)) {
DRM_ERROR("%s initialization failed "
- "ctl %08x (valid? %d) head %08x tail %08x start %08x [expected %08lx]\n",
+ "ctl %08x (valid? %d) head %08x tail %08x start %08x [expected %08llx]\n",
engine->name,
I915_READ_CTL(engine),
I915_READ_CTL(engine) & RING_VALID,
I915_READ_HEAD(engine), I915_READ_TAIL(engine),
I915_READ_START(engine),
- (unsigned long)i915_gem_obj_ggtt_offset(obj));
+ ring->vma->node.start);
ret = -EIO;
goto out;
}
@@ -1935,55 +1934,31 @@ static int init_phys_status_page(struct intel_engine_cs *engine)
int intel_ring_pin(struct intel_ring *ring)
{
- struct drm_i915_private *dev_priv = ring->engine->i915;
- struct drm_i915_gem_object *obj = ring->obj;
/* Ring wraparound at offset 0 sometimes hangs. No idea why. */
- unsigned flags = PIN_OFFSET_BIAS | 4096;
+ unsigned int flags = PIN_GLOBAL | PIN_OFFSET_BIAS | 4096;
void *addr;
int ret;
- if (HAS_LLC(dev_priv) && !obj->stolen) {
- ret = i915_gem_object_ggtt_pin(obj, NULL, 0, PAGE_SIZE, flags);
- if (ret)
- return ret;
-
- ret = i915_gem_object_set_to_cpu_domain(obj, true);
- if (ret)
- goto err_unpin;
+ GEM_BUG_ON(ring->vaddr);
- addr = i915_gem_object_pin_map(obj);
- if (IS_ERR(addr)) {
- ret = PTR_ERR(addr);
- goto err_unpin;
- }
- } else {
- ret = i915_gem_object_ggtt_pin(obj, NULL, 0, PAGE_SIZE,
- flags | PIN_MAPPABLE);
- if (ret)
- return ret;
-
- ret = i915_gem_object_set_to_gtt_domain(obj, true);
- if (ret)
- goto err_unpin;
+ if (ring->vmap)
+ flags |= PIN_MAPPABLE;
- /* Access through the GTT requires the device to be awake. */
- assert_rpm_wakelock_held(dev_priv);
+ ret = i915_vma_pin(ring->vma, 0, PAGE_SIZE, flags);
+ if (unlikely(ret))
+ return ret;
- addr = (void __force *)
- i915_vma_pin_iomap(i915_gem_obj_to_ggtt(obj));
- if (IS_ERR(addr)) {
- ret = PTR_ERR(addr);
- goto err_unpin;
- }
+ if (ring->vmap)
+ addr = i915_gem_object_pin_map(ring->vma->obj);
+ else
+ addr = (void __force *)i915_vma_pin_iomap(ring->vma);
+ if (IS_ERR(addr)) {
+ i915_vma_unpin(ring->vma);
+ return PTR_ERR(addr);
}
ring->vaddr = addr;
- ring->vma = i915_gem_obj_to_ggtt(obj);
return 0;
-
-err_unpin:
- i915_gem_object_ggtt_unpin(obj);
- return ret;
}
void intel_ring_unpin(struct intel_ring *ring)
@@ -1991,60 +1966,66 @@ void intel_ring_unpin(struct intel_ring *ring)
GEM_BUG_ON(!ring->vma);
GEM_BUG_ON(!ring->vaddr);
- if (HAS_LLC(ring->engine->i915) && !ring->obj->stolen)
- i915_gem_object_unpin_map(ring->obj);
+ if (ring->vmap)
+ i915_gem_object_unpin_map(ring->vma->obj);
else
i915_vma_unpin_iomap(ring->vma);
ring->vaddr = NULL;
- i915_gem_object_ggtt_unpin(ring->obj);
- ring->vma = NULL;
+ i915_vma_unpin(ring->vma);
}
-static void intel_destroy_ringbuffer_obj(struct intel_ring *ring)
-{
- i915_gem_object_put(ring->obj);
- ring->obj = NULL;
-}
-
-static int intel_alloc_ringbuffer_obj(struct drm_device *dev,
- struct intel_ring *ring)
+static struct i915_vma *
+intel_ring_create_vma(struct drm_i915_private *dev_priv, int size)
{
struct drm_i915_gem_object *obj;
+ struct i915_vma *vma;
+ int ret;
- obj = NULL;
- if (!HAS_LLC(dev))
- obj = i915_gem_object_create_stolen(dev, ring->size);
- if (obj == NULL)
- obj = i915_gem_object_create(dev, ring->size);
+ obj = ERR_PTR(-ENODEV);
+ if (!HAS_LLC(dev_priv))
+ obj = i915_gem_object_create_stolen(&dev_priv->drm, size);
+ if (IS_ERR(obj))
+ obj = i915_gem_object_create(&dev_priv->drm, size);
if (IS_ERR(obj))
- return PTR_ERR(obj);
+ return ERR_CAST(obj);
/* mark ring buffers as read-only from GPU side by default */
obj->gt_ro = 1;
- ring->obj = obj;
+ if (HAS_LLC(dev_priv) && !obj->stolen)
+ ret = i915_gem_object_set_to_cpu_domain(obj, true);
+ else
+ ret = i915_gem_object_set_to_gtt_domain(obj, true);
+ if (ret) {
+ vma = ERR_PTR(ret);
+ goto err;
+ }
- return 0;
+ vma = i915_vma_create(obj, &dev_priv->ggtt.base, NULL);
+ if (IS_ERR(vma))
+ goto err;
+
+ return vma;
+
+err:
+ i915_gem_object_put(obj);
+ return vma;
}
struct intel_ring *
intel_engine_create_ring(struct intel_engine_cs *engine, int size)
{
struct intel_ring *ring;
- int ret;
+ struct i915_vma *vma;
GEM_BUG_ON(!is_power_of_2(size));
ring = kzalloc(sizeof(*ring), GFP_KERNEL);
- if (ring == NULL) {
- DRM_DEBUG_DRIVER("Failed to allocate ringbuffer %s\n",
- engine->name);
+ if (!ring)
return ERR_PTR(-ENOMEM);
- }
ring->engine = engine;
- list_add(&ring->link, &engine->buffers);
INIT_LIST_HEAD(&ring->request_list);
@@ -2060,22 +2041,23 @@ intel_engine_create_ring(struct intel_engine_cs *engine, int size)
ring->last_retired_head = -1;
intel_ring_update_space(ring);
- ret = intel_alloc_ringbuffer_obj(&engine->i915->drm, ring);
- if (ret) {
- DRM_DEBUG_DRIVER("Failed to allocate ringbuffer %s: %d\n",
- engine->name, ret);
- list_del(&ring->link);
+ vma = intel_ring_create_vma(engine->i915, size);
+ if (IS_ERR(vma)) {
kfree(ring);
- return ERR_PTR(ret);
+ return ERR_CAST(vma);
}
+ ring->vma = vma;
+ if (HAS_LLC(engine->i915) && !vma->obj->stolen)
+ ring->vmap = true;
+ list_add(&ring->link, &engine->buffers);
return ring;
}
void
intel_ring_free(struct intel_ring *ring)
{
- intel_destroy_ringbuffer_obj(ring);
+ i915_gem_object_put(ring->vma->obj);
list_del(&ring->link);
kfree(ring);
}
@@ -2169,7 +2151,6 @@ static int intel_init_ring_buffer(struct intel_engine_cs *engine)
ret = PTR_ERR(ring);
goto error;
}
- engine->buffer = ring;
if (I915_NEED_GFX_HWS(dev_priv)) {
ret = init_status_page(engine);
@@ -2184,11 +2165,10 @@ static int intel_init_ring_buffer(struct intel_engine_cs *engine)
ret = intel_ring_pin(ring);
if (ret) {
- DRM_ERROR("Failed to pin and map ringbuffer %s: %d\n",
- engine->name, ret);
- intel_destroy_ringbuffer_obj(ring);
+ intel_ring_free(ring);
goto error;
}
+ engine->buffer = ring;
return 0;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 66dc93469076..e60c8a950b86 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -83,9 +83,8 @@ struct intel_engine_hangcheck {
};
struct intel_ring {
- struct drm_i915_gem_object *obj;
- void *vaddr;
struct i915_vma *vma;
+ void *vaddr;
struct intel_engine_cs *engine;
struct list_head link;
@@ -97,6 +96,7 @@ struct intel_ring {
int space;
int size;
int effective_size;
+ bool vmap;
/** We track the position of the requests in the ring buffer, and
* when each is retired we increment last_retired_head as the GPU
--
2.8.1
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