[PATCH 3/5] drm/radeon: rework ring syncing code
Christian König
deathsimple at vodafone.de
Fri May 11 03:10:27 PDT 2012
Move inter ring syncing with semaphores into the
existing ring allocations, with that we need to
lock the ring mutex only once.
Signed-off-by: Christian König <deathsimple at vodafone.de>
---
drivers/gpu/drm/radeon/evergreen_blit_kms.c | 3 +-
drivers/gpu/drm/radeon/r600.c | 5 +-
drivers/gpu/drm/radeon/r600_blit_kms.c | 24 +++++++--
drivers/gpu/drm/radeon/radeon.h | 6 +--
drivers/gpu/drm/radeon/radeon_asic.h | 5 +-
drivers/gpu/drm/radeon/radeon_cs.c | 38 +++-----------
drivers/gpu/drm/radeon/radeon_ring.c | 30 +++++++++--
drivers/gpu/drm/radeon/radeon_semaphore.c | 71 ++++++++++-----------------
drivers/gpu/drm/radeon/radeon_test.c | 6 +--
drivers/gpu/drm/radeon/radeon_ttm.c | 20 --------
10 files changed, 92 insertions(+), 116 deletions(-)
diff --git a/drivers/gpu/drm/radeon/evergreen_blit_kms.c b/drivers/gpu/drm/radeon/evergreen_blit_kms.c
index 30f0480..4bbf83c 100644
--- a/drivers/gpu/drm/radeon/evergreen_blit_kms.c
+++ b/drivers/gpu/drm/radeon/evergreen_blit_kms.c
@@ -622,7 +622,8 @@ int evergreen_blit_init(struct radeon_device *rdev)
rdev->r600_blit.primitives.draw_auto = draw_auto;
rdev->r600_blit.primitives.set_default_state = set_default_state;
- rdev->r600_blit.ring_size_common = 55; /* shaders + def state */
+ rdev->r600_blit.ring_size_common = 8; /* sync semaphore */
+ rdev->r600_blit.ring_size_common += 55; /* shaders + def state */
rdev->r600_blit.ring_size_common += 16; /* fence emit for VB IB */
rdev->r600_blit.ring_size_common += 5; /* done copy */
rdev->r600_blit.ring_size_common += 16; /* fence emit for done copy */
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index b680cc4..b12687b 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -2363,15 +2363,16 @@ int r600_copy_blit(struct radeon_device *rdev,
unsigned num_gpu_pages,
struct radeon_fence **fence)
{
+ struct radeon_semaphore *sem = NULL;
struct radeon_sa_bo *vb = NULL;
int r;
- r = r600_blit_prepare_copy(rdev, num_gpu_pages, &vb);
+ r = r600_blit_prepare_copy(rdev, num_gpu_pages, fence, &vb, &sem);
if (r) {
return r;
}
r600_kms_blit_copy(rdev, src_offset, dst_offset, num_gpu_pages, vb);
- r600_blit_done_copy(rdev, fence, vb);
+ r600_blit_done_copy(rdev, fence, vb, sem);
return 0;
}
diff --git a/drivers/gpu/drm/radeon/r600_blit_kms.c b/drivers/gpu/drm/radeon/r600_blit_kms.c
index 5d1f1c0..b683221 100644
--- a/drivers/gpu/drm/radeon/r600_blit_kms.c
+++ b/drivers/gpu/drm/radeon/r600_blit_kms.c
@@ -512,7 +512,8 @@ int r600_blit_init(struct radeon_device *rdev)
rdev->r600_blit.primitives.draw_auto = draw_auto;
rdev->r600_blit.primitives.set_default_state = set_default_state;
- rdev->r600_blit.ring_size_common = 40; /* shaders + def state */
+ rdev->r600_blit.ring_size_common = 8; /* sync semaphore */
+ rdev->r600_blit.ring_size_common += 40; /* shaders + def state */
rdev->r600_blit.ring_size_common += 5; /* done copy */
rdev->r600_blit.ring_size_common += 16; /* fence emit for done copy */
@@ -666,7 +667,8 @@ static unsigned r600_blit_create_rect(unsigned num_gpu_pages,
int r600_blit_prepare_copy(struct radeon_device *rdev, unsigned num_gpu_pages,
- struct radeon_sa_bo **vb)
+ struct radeon_fence **fence, struct radeon_sa_bo **vb,
+ struct radeon_semaphore **sem)
{
struct radeon_ring *ring = &rdev->ring[RADEON_RING_TYPE_GFX_INDEX];
int r;
@@ -689,22 +691,37 @@ int r600_blit_prepare_copy(struct radeon_device *rdev, unsigned num_gpu_pages,
return r;
}
+ r = radeon_semaphore_create(rdev, sem);
+ if (r) {
+ radeon_sa_bo_free(rdev, vb, NULL);
+ return r;
+ }
+
/* calculate number of loops correctly */
ring_size = num_loops * dwords_per_loop;
ring_size += rdev->r600_blit.ring_size_common;
r = radeon_ring_lock(rdev, ring, ring_size);
if (r) {
radeon_sa_bo_free(rdev, vb, NULL);
+ radeon_semaphore_free(rdev, sem, NULL);
return r;
}
+ if (radeon_fence_need_sync(*fence, RADEON_RING_TYPE_GFX_INDEX)) {
+ radeon_semaphore_sync_rings(rdev, *sem, (*fence)->ring,
+ RADEON_RING_TYPE_GFX_INDEX);
+ radeon_fence_note_sync(*fence, RADEON_RING_TYPE_GFX_INDEX);
+ } else {
+ radeon_semaphore_free(rdev, sem, NULL);
+ }
+
rdev->r600_blit.primitives.set_default_state(rdev);
rdev->r600_blit.primitives.set_shaders(rdev);
return 0;
}
void r600_blit_done_copy(struct radeon_device *rdev, struct radeon_fence **fence,
- struct radeon_sa_bo *vb)
+ struct radeon_sa_bo *vb, struct radeon_semaphore *sem)
{
struct radeon_ring *ring = &rdev->ring[RADEON_RING_TYPE_GFX_INDEX];
int r;
@@ -717,6 +734,7 @@ void r600_blit_done_copy(struct radeon_device *rdev, struct radeon_fence **fence
radeon_ring_unlock_commit(rdev, ring);
radeon_sa_bo_free(rdev, &vb, *fence);
+ radeon_semaphore_free(rdev, &sem, *fence);
}
void r600_kms_blit_copy(struct radeon_device *rdev,
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index b02e36b..e00c50d 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -465,10 +465,9 @@ void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
struct radeon_semaphore *semaphore);
int radeon_semaphore_sync_rings(struct radeon_device *rdev,
struct radeon_semaphore *semaphore,
- bool sync_to[RADEON_NUM_RINGS],
- int dst_ring);
+ int signaler, int waiter);
void radeon_semaphore_free(struct radeon_device *rdev,
- struct radeon_semaphore *semaphore,
+ struct radeon_semaphore **semaphore,
struct radeon_fence *fence);
/*
@@ -648,6 +647,7 @@ struct radeon_ib {
struct radeon_fence *fence;
unsigned vm_id;
bool is_const_ib;
+ struct radeon_fence *sync_to[RADEON_NUM_RINGS];
struct radeon_semaphore *semaphore;
};
diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
index 6d0beaf..fe18f51 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.h
+++ b/drivers/gpu/drm/radeon/radeon_asic.h
@@ -369,9 +369,10 @@ int r600_hdmi_buffer_status_changed(struct drm_encoder *encoder);
void r600_hdmi_update_audio_settings(struct drm_encoder *encoder);
/* r600 blit */
int r600_blit_prepare_copy(struct radeon_device *rdev, unsigned num_gpu_pages,
- struct radeon_sa_bo **vb);
+ struct radeon_fence **fence, struct radeon_sa_bo **vb,
+ struct radeon_semaphore **sem);
void r600_blit_done_copy(struct radeon_device *rdev, struct radeon_fence **fence,
- struct radeon_sa_bo *vb);
+ struct radeon_sa_bo *vb, struct radeon_semaphore *sem);
void r600_kms_blit_copy(struct radeon_device *rdev,
u64 src_gpu_addr, u64 dst_gpu_addr,
unsigned num_gpu_pages,
diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index c7d64a7..d295821 100644
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -115,36 +115,20 @@ static int radeon_cs_get_ring(struct radeon_cs_parser *p, u32 ring, s32 priority
return 0;
}
-static int radeon_cs_sync_rings(struct radeon_cs_parser *p)
+static void radeon_cs_sync_rings(struct radeon_cs_parser *p)
{
- bool sync_to_ring[RADEON_NUM_RINGS] = { };
- bool need_sync = false;
- int i, r;
+ int i;
for (i = 0; i < p->nrelocs; i++) {
- struct radeon_fence *fence;
+ struct radeon_fence *a, *b;
if (!p->relocs[i].robj || !p->relocs[i].robj->tbo.sync_obj)
continue;
- fence = p->relocs[i].robj->tbo.sync_obj;
- if (fence->ring != p->ring && !radeon_fence_signaled(fence)) {
- sync_to_ring[fence->ring] = true;
- need_sync = true;
- }
- }
-
- if (!need_sync) {
- return 0;
- }
-
- r = radeon_semaphore_create(p->rdev, &p->ib.semaphore);
- if (r) {
- return r;
+ a = p->relocs[i].robj->tbo.sync_obj;
+ b = p->ib.sync_to[a->ring];
+ p->ib.sync_to[a->ring] = radeon_fence_later(a, b);
}
-
- return radeon_semaphore_sync_rings(p->rdev, p->ib.semaphore,
- sync_to_ring, p->ring);
}
int radeon_cs_parser_init(struct radeon_cs_parser *p, void *data)
@@ -365,10 +349,7 @@ static int radeon_cs_ib_chunk(struct radeon_device *rdev,
DRM_ERROR("Invalid command stream !\n");
return r;
}
- r = radeon_cs_sync_rings(parser);
- if (r) {
- DRM_ERROR("Failed to synchronize rings !\n");
- }
+ radeon_cs_sync_rings(parser);
parser->ib.vm_id = 0;
r = radeon_ib_schedule(rdev, &parser->ib);
if (r) {
@@ -465,10 +446,7 @@ static int radeon_cs_ib_vm_chunk(struct radeon_device *rdev,
if (r) {
goto out;
}
- r = radeon_cs_sync_rings(parser);
- if (r) {
- DRM_ERROR("Failed to synchronize rings !\n");
- }
+ radeon_cs_sync_rings(parser);
if ((rdev->family >= CHIP_TAHITI) &&
(parser->chunk_const_ib_idx != -1)) {
diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index 2d91bbb..cf70c2c 100644
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -67,7 +67,7 @@ u32 radeon_get_ib_value(struct radeon_cs_parser *p, int idx)
int radeon_ib_get(struct radeon_device *rdev, int ring,
struct radeon_ib *ib, unsigned size)
{
- int r;
+ int i, r;
r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo, &ib->sa_bo, size, 256, true);
if (r) {
@@ -75,20 +75,26 @@ int radeon_ib_get(struct radeon_device *rdev, int ring,
return r;
}
+ r = radeon_semaphore_create(rdev, &ib->semaphore);
+ if (r) {
+ return r;
+ }
+
ib->ring = ring;
ib->fence = NULL;
ib->ptr = radeon_sa_bo_cpu_addr(ib->sa_bo);
ib->gpu_addr = radeon_sa_bo_gpu_addr(ib->sa_bo);
ib->vm_id = 0;
ib->is_const_ib = false;
- ib->semaphore = NULL;
+ for (i = 0; i < RADEON_NUM_RINGS; ++i)
+ ib->sync_to[i] = NULL;
return 0;
}
void radeon_ib_free(struct radeon_device *rdev, struct radeon_ib *ib)
{
- radeon_semaphore_free(rdev, ib->semaphore, ib->fence);
+ radeon_semaphore_free(rdev, &ib->semaphore, ib->fence);
radeon_sa_bo_free(rdev, &ib->sa_bo, ib->fence);
radeon_fence_unref(&ib->fence);
}
@@ -96,7 +102,8 @@ void radeon_ib_free(struct radeon_device *rdev, struct radeon_ib *ib)
int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib)
{
struct radeon_ring *ring = &rdev->ring[ib->ring];
- int r = 0;
+ bool need_sync = false;
+ int i, r = 0;
if (!ib->length_dw || !ring->ready) {
/* TODO: Nothings in the ib we should report. */
@@ -105,11 +112,24 @@ int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib)
}
/* 64 dwords should be enough for fence too */
- r = radeon_ring_lock(rdev, ring, 64);
+ r = radeon_ring_lock(rdev, ring, 64 + RADEON_NUM_RINGS * 8);
if (r) {
dev_err(rdev->dev, "scheduling IB failed (%d).\n", r);
return r;
}
+ for (i = 0; i < RADEON_NUM_RINGS; ++i) {
+ struct radeon_fence *fence = ib->sync_to[i];
+ if (radeon_fence_need_sync(fence, ib->ring)) {
+ need_sync = true;
+ radeon_semaphore_sync_rings(rdev, ib->semaphore,
+ fence->ring, ib->ring);
+ radeon_fence_note_sync(fence, ib->ring);
+ }
+ }
+ /* immediately free semaphore when we don't need to sync */
+ if (!need_sync) {
+ radeon_semaphore_free(rdev, &ib->semaphore, NULL);
+ }
radeon_ring_ib_execute(rdev, ib->ring, ib);
r = radeon_fence_emit(rdev, &ib->fence, ib->ring);
if (r) {
diff --git a/drivers/gpu/drm/radeon/radeon_semaphore.c b/drivers/gpu/drm/radeon/radeon_semaphore.c
index e2ace5d..7cc78de 100644
--- a/drivers/gpu/drm/radeon/radeon_semaphore.c
+++ b/drivers/gpu/drm/radeon/radeon_semaphore.c
@@ -68,70 +68,49 @@ void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
}
+/* caller must hold ring lock */
int radeon_semaphore_sync_rings(struct radeon_device *rdev,
struct radeon_semaphore *semaphore,
- bool sync_to[RADEON_NUM_RINGS],
- int dst_ring)
+ int signaler, int waiter)
{
- int i = 0, r;
+ int r;
- mutex_lock(&rdev->ring_lock);
- r = radeon_ring_alloc(rdev, &rdev->ring[dst_ring], RADEON_NUM_RINGS * 8);
- if (r) {
- goto error;
+ /* no need to signal and wait on the same ring */
+ if (signaler == waiter) {
+ return 0;
}
- for (i = 0; i < RADEON_NUM_RINGS; ++i) {
- /* no need to sync to our own or unused rings */
- if (!sync_to[i] || i == dst_ring)
- continue;
-
- /* prevent GPU deadlocks */
- if (!rdev->ring[i].ready) {
- dev_err(rdev->dev, "Trying to sync to a disabled ring!");
- r = -EINVAL;
- goto error;
- }
-
- r = radeon_ring_alloc(rdev, &rdev->ring[i], 8);
- if (r) {
- goto error;
- }
-
- radeon_semaphore_emit_signal(rdev, i, semaphore);
- radeon_semaphore_emit_wait(rdev, dst_ring, semaphore);
+ /* prevent GPU deadlocks */
+ if (!rdev->ring[signaler].ready) {
+ dev_err(rdev->dev, "Trying to sync to a disabled ring!");
+ return -EINVAL;
+ }
- radeon_ring_commit(rdev, &rdev->ring[i]);
+ r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8);
+ if (r) {
+ return r;
}
+ radeon_semaphore_emit_signal(rdev, signaler, semaphore);
+ radeon_ring_commit(rdev, &rdev->ring[signaler]);
- radeon_ring_commit(rdev, &rdev->ring[dst_ring]);
- mutex_unlock(&rdev->ring_lock);
+ /* we assume caller has already allocated space on waiters ring */
+ radeon_semaphore_emit_wait(rdev, waiter, semaphore);
return 0;
-
-error:
- /* unlock all locks taken so far */
- for (--i; i >= 0; --i) {
- if (sync_to[i] || i == dst_ring) {
- radeon_ring_undo(&rdev->ring[i]);
- }
- }
- radeon_ring_undo(&rdev->ring[dst_ring]);
- mutex_unlock(&rdev->ring_lock);
- return r;
}
void radeon_semaphore_free(struct radeon_device *rdev,
- struct radeon_semaphore *semaphore,
+ struct radeon_semaphore **semaphore,
struct radeon_fence *fence)
{
- if (semaphore == NULL) {
+ if (semaphore == NULL || *semaphore == NULL) {
return;
}
- if (semaphore->waiters > 0) {
+ if ((*semaphore)->waiters > 0) {
dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
- " hardware lockup imminent!\n", semaphore);
+ " hardware lockup imminent!\n", *semaphore);
}
- radeon_sa_bo_free(rdev, &semaphore->sa_bo, fence);
- kfree(semaphore);
+ radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
+ kfree(*semaphore);
+ *semaphore = NULL;
}
diff --git a/drivers/gpu/drm/radeon/radeon_test.c b/drivers/gpu/drm/radeon/radeon_test.c
index eace3a5..ff6ac4b 100644
--- a/drivers/gpu/drm/radeon/radeon_test.c
+++ b/drivers/gpu/drm/radeon/radeon_test.c
@@ -303,8 +303,7 @@ void radeon_test_ring_sync(struct radeon_device *rdev,
}
out_cleanup:
- if (semaphore)
- radeon_semaphore_free(rdev, semaphore, NULL);
+ radeon_semaphore_free(rdev, &semaphore, NULL);
if (fence1)
radeon_fence_unref(&fence1);
@@ -422,8 +421,7 @@ void radeon_test_ring_sync2(struct radeon_device *rdev,
}
out_cleanup:
- if (semaphore)
- radeon_semaphore_free(rdev, semaphore, NULL);
+ radeon_semaphore_free(rdev, &semaphore, NULL);
if (fenceA)
radeon_fence_unref(&fenceA);
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 860e730..a7f9007 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -223,7 +223,6 @@ static int radeon_move_blit(struct ttm_buffer_object *bo,
struct radeon_device *rdev;
uint64_t old_start, new_start;
struct radeon_fence *fence;
- struct radeon_semaphore *sem = NULL;
int r, ridx;
rdev = radeon_get_rdev(bo->bdev);
@@ -262,31 +261,12 @@ static int radeon_move_blit(struct ttm_buffer_object *bo,
/* sync other rings */
fence = bo->sync_obj;
- if (fence && fence->ring != ridx
- && !radeon_fence_signaled(fence)) {
- bool sync_to_ring[RADEON_NUM_RINGS] = { };
- sync_to_ring[fence->ring] = true;
-
- r = radeon_semaphore_create(rdev, &sem);
- if (r) {
- return r;
- }
-
- r = radeon_semaphore_sync_rings(rdev, sem, sync_to_ring, ridx);
- if (r) {
- radeon_semaphore_free(rdev, sem, NULL);
- return r;
- }
- }
-
- fence = NULL;
r = radeon_copy(rdev, old_start, new_start,
new_mem->num_pages * (PAGE_SIZE / RADEON_GPU_PAGE_SIZE), /* GPU pages */
&fence);
/* FIXME: handle copy error */
r = ttm_bo_move_accel_cleanup(bo, (void *)fence, NULL,
evict, no_wait_reserve, no_wait_gpu, new_mem);
- radeon_semaphore_free(rdev, sem, fence);
radeon_fence_unref(&fence);
return r;
}
--
1.7.9.5
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