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drm/radeon: add infrastructure for advanced ring synchronization v2 

v2: BUG_ON not matching rings.

Signed-off-by: Christian König <deathsimple@vodafone.de>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
This commit is contained in:
Christian König 2012-05-10 15:57:31 +02:00
parent 876dc9f329
commit 68e250b7c2
2 changed files with 87 additions and 11 deletions
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25
drivers/gpu/drm/radeon/radeon.h
View File

@ -257,8 +257,8 @@ struct radeon_fence_driver {
uint32_t scratch_reg;
uint64_t gpu_addr;
volatile uint32_t *cpu_addr;
/* seq is protected by ring emission lock */
uint64_t seq;
/* sync_seq is protected by ring emission lock */
uint64_t sync_seq[RADEON_NUM_RINGS];
atomic64_t last_seq;
unsigned long last_activity;
bool initialized;
@ -288,6 +288,27 @@ int radeon_fence_wait_any(struct radeon_device *rdev,
struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence);
void radeon_fence_unref(struct radeon_fence **fence);
unsigned radeon_fence_count_emitted(struct radeon_device *rdev, int ring);
bool radeon_fence_need_sync(struct radeon_fence *fence, int ring);
void radeon_fence_note_sync(struct radeon_fence *fence, int ring);
static inline struct radeon_fence *radeon_fence_later(struct radeon_fence *a,
struct radeon_fence *b)
{
if (!a) {
return b;
}
if (!b) {
return a;
}
BUG_ON(a->ring != b->ring);
if (a->seq > b->seq) {
return a;
} else {
return b;
}
}
/*
* Tiling registers

73
drivers/gpu/drm/radeon/radeon_fence.c
View File

@ -72,7 +72,7 @@ int radeon_fence_emit(struct radeon_device *rdev,
}
kref_init(&((*fence)->kref));
(*fence)->rdev = rdev;
(*fence)->seq = ++rdev->fence_drv[ring].seq;
(*fence)->seq = ++rdev->fence_drv[ring].sync_seq[ring];
(*fence)->ring = ring;
radeon_fence_ring_emit(rdev, ring, *fence);
trace_radeon_fence_emit(rdev->ddev, (*fence)->seq);
@ -449,7 +449,7 @@ int radeon_fence_wait_next_locked(struct radeon_device *rdev, int ring)
* wait.
*/
seq = atomic64_read(&rdev->fence_drv[ring].last_seq) + 1ULL;
if (seq >= rdev->fence_drv[ring].seq) {
if (seq >= rdev->fence_drv[ring].sync_seq[ring]) {
/* nothing to wait for, last_seq is
already the last emited fence */
return -ENOENT;
@ -464,7 +464,7 @@ int radeon_fence_wait_empty_locked(struct radeon_device *rdev, int ring)
* activity can be scheduled so there won't be concurrent access
* to seq value.
*/
return radeon_fence_wait_seq(rdev, rdev->fence_drv[ring].seq,
return radeon_fence_wait_seq(rdev, rdev->fence_drv[ring].sync_seq[ring],
ring, false, false);
}
@ -492,7 +492,8 @@ unsigned radeon_fence_count_emitted(struct radeon_device *rdev, int ring)
* but it's ok to report slightly wrong fence count here.
*/
radeon_fence_process(rdev, ring);
emitted = rdev->fence_drv[ring].seq - atomic64_read(&rdev->fence_drv[ring].last_seq);
emitted = rdev->fence_drv[ring].sync_seq[ring]
- atomic64_read(&rdev->fence_drv[ring].last_seq);
/* to avoid 32bits warp around */
if (emitted > 0x10000000) {
emitted = 0x10000000;
@ -500,6 +501,51 @@ unsigned radeon_fence_count_emitted(struct radeon_device *rdev, int ring)
return (unsigned)emitted;
}
bool radeon_fence_need_sync(struct radeon_fence *fence, int dst_ring)
{
struct radeon_fence_driver *fdrv;
if (!fence) {
return false;
}
if (fence->ring == dst_ring) {
return false;
}
/* we are protected by the ring mutex */
fdrv = &fence->rdev->fence_drv[dst_ring];
if (fence->seq <= fdrv->sync_seq[fence->ring]) {
return false;
}
return true;
}
void radeon_fence_note_sync(struct radeon_fence *fence, int dst_ring)
{
struct radeon_fence_driver *dst, *src;
unsigned i;
if (!fence) {
return;
}
if (fence->ring == dst_ring) {
return;
}
/* we are protected by the ring mutex */
src = &fence->rdev->fence_drv[fence->ring];
dst = &fence->rdev->fence_drv[dst_ring];
for (i = 0; i < RADEON_NUM_RINGS; ++i) {
if (i == dst_ring) {
continue;
}
dst->sync_seq[i] = max(dst->sync_seq[i], src->sync_seq[i]);
}
}
int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring)
{
uint64_t index;
@ -521,7 +567,7 @@ int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring)
}
rdev->fence_drv[ring].cpu_addr = &rdev->wb.wb[index/4];
rdev->fence_drv[ring].gpu_addr = rdev->wb.gpu_addr + index;
radeon_fence_write(rdev, rdev->fence_drv[ring].seq, ring);
radeon_fence_write(rdev, rdev->fence_drv[ring].sync_seq[ring], ring);
rdev->fence_drv[ring].initialized = true;
dev_info(rdev->dev, "fence driver on ring %d use gpu addr 0x%016llx and cpu addr 0x%p\n",
ring, rdev->fence_drv[ring].gpu_addr, rdev->fence_drv[ring].cpu_addr);
@ -530,10 +576,13 @@ int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring)
static void radeon_fence_driver_init_ring(struct radeon_device *rdev, int ring)
{
int i;
rdev->fence_drv[ring].scratch_reg = -1;
rdev->fence_drv[ring].cpu_addr = NULL;
rdev->fence_drv[ring].gpu_addr = 0;
rdev->fence_drv[ring].seq = 0;
for (i = 0; i < RADEON_NUM_RINGS; ++i)
rdev->fence_drv[ring].sync_seq[i] = 0;
atomic64_set(&rdev->fence_drv[ring].last_seq, 0);
rdev->fence_drv[ring].last_activity = jiffies;
rdev->fence_drv[ring].initialized = false;
@ -579,7 +628,7 @@ static int radeon_debugfs_fence_info(struct seq_file *m, void *data)
struct drm_info_node *node = (struct drm_info_node *)m->private;
struct drm_device *dev = node->minor->dev;
struct radeon_device *rdev = dev->dev_private;
int i;
int i, j;
for (i = 0; i < RADEON_NUM_RINGS; ++i) {
if (!rdev->fence_drv[i].initialized)
@ -588,8 +637,14 @@ static int radeon_debugfs_fence_info(struct seq_file *m, void *data)
seq_printf(m, "--- ring %d ---\n", i);
seq_printf(m, "Last signaled fence 0x%016llx\n",
(unsigned long long)atomic64_read(&rdev->fence_drv[i].last_seq));
seq_printf(m, "Last emitted 0x%016llx\n",
rdev->fence_drv[i].seq);
seq_printf(m, "Last emitted 0x%016llx\n",
rdev->fence_drv[i].sync_seq[i]);
for (j = 0; j < RADEON_NUM_RINGS; ++j) {
if (i != j && rdev->fence_drv[j].initialized)
seq_printf(m, "Last sync to ring %d 0x%016llx\n",
j, rdev->fence_drv[i].sync_seq[j]);
}
}
return 0;
}