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drm/amdgpu: switch back to 32bit hw fences v2

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We don't need to extend them to 64bits any more, so avoid the extra overhead.

v2: update commit message.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
This commit is contained in:
Christian König 2016-03-14 15:46:06 +01:00 committed by Alex Deucher
parent 480d0bf07e
commit 742c085fa8
2 changed files with 21 additions and 32 deletions
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4
drivers/gpu/drm/amd/amdgpu/amdgpu.h
View file

@ -386,8 +386,8 @@ struct amdgpu_fence_driver {
uint64_t gpu_addr;
volatile uint32_t *cpu_addr;
/* sync_seq is protected by ring emission lock */
uint64_t sync_seq;
atomic64_t last_seq;
uint32_t sync_seq;
atomic_t last_seq;
bool initialized;
struct amdgpu_irq_src *irq_src;
unsigned irq_type;

49
drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
View file

@ -52,7 +52,6 @@ struct amdgpu_fence {
/* RB, DMA, etc. */
struct amdgpu_ring *ring;
uint64_t seq;
};
static struct kmem_cache *amdgpu_fence_slab;
@ -104,7 +103,7 @@ static u32 amdgpu_fence_read(struct amdgpu_ring *ring)
if (drv->cpu_addr)
seq = le32_to_cpu(*drv->cpu_addr);
else
seq = lower_32_bits(atomic64_read(&drv->last_seq));
seq = atomic_read(&drv->last_seq);
return seq;
}
@ -123,23 +122,22 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct fence **f)
struct amdgpu_device *adev = ring->adev;
struct amdgpu_fence *fence;
struct fence **ptr;
unsigned idx;
uint32_t seq;
fence = kmem_cache_alloc(amdgpu_fence_slab, GFP_KERNEL);
if (fence == NULL)
return -ENOMEM;
fence->seq = ++ring->fence_drv.sync_seq;
seq = ++ring->fence_drv.sync_seq;
fence->ring = ring;
fence_init(&fence->base, &amdgpu_fence_ops,
&ring->fence_drv.lock,
adev->fence_context + ring->idx,
fence->seq);
seq);
amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
fence->seq, AMDGPU_FENCE_FLAG_INT);
seq, AMDGPU_FENCE_FLAG_INT);
idx = fence->seq & ring->fence_drv.num_fences_mask;
ptr = &ring->fence_drv.fences[idx];
ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
/* This function can't be called concurrently anyway, otherwise
* emitting the fence would mess up the hardware ring buffer.
*/
@ -177,22 +175,16 @@ static void amdgpu_fence_schedule_fallback(struct amdgpu_ring *ring)
void amdgpu_fence_process(struct amdgpu_ring *ring)
{
struct amdgpu_fence_driver *drv = &ring->fence_drv;
uint64_t seq, last_seq, last_emitted;
uint32_t seq, last_seq;
int r;
do {
last_seq = atomic64_read(&ring->fence_drv.last_seq);
last_emitted = ring->fence_drv.sync_seq;
last_seq = atomic_read(&ring->fence_drv.last_seq);
seq = amdgpu_fence_read(ring);
seq |= last_seq & 0xffffffff00000000LL;
if (seq < last_seq) {
seq &= 0xffffffff;
seq |= last_emitted & 0xffffffff00000000LL;
}
} while (atomic64_cmpxchg(&drv->last_seq, last_seq, seq) != last_seq);
} while (atomic_cmpxchg(&drv->last_seq, last_seq, seq) != last_seq);
if (seq < last_emitted)
if (seq != ring->fence_drv.sync_seq)
amdgpu_fence_schedule_fallback(ring);
while (last_seq != seq) {
@ -279,13 +271,10 @@ unsigned amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
* but it's ok to report slightly wrong fence count here.
*/
amdgpu_fence_process(ring);
emitted = ring->fence_drv.sync_seq
- atomic64_read(&ring->fence_drv.last_seq);
/* to avoid 32bits warp around */
if (emitted > 0x10000000)
emitted = 0x10000000;
return (unsigned)emitted;
emitted = 0x100000000ull;
emitted -= atomic_read(&ring->fence_drv.last_seq);
emitted += ACCESS_ONCE(ring->fence_drv.sync_seq);
return lower_32_bits(emitted);
}
/**
@ -317,7 +306,7 @@ int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring,
ring->fence_drv.cpu_addr = adev->uvd.cpu_addr + index;
ring->fence_drv.gpu_addr = adev->uvd.gpu_addr + index;
}
amdgpu_fence_write(ring, atomic64_read(&ring->fence_drv.last_seq));
amdgpu_fence_write(ring, atomic_read(&ring->fence_drv.last_seq));
amdgpu_irq_get(adev, irq_src, irq_type);
ring->fence_drv.irq_src = irq_src;
@ -353,7 +342,7 @@ int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring,
ring->fence_drv.cpu_addr = NULL;
ring->fence_drv.gpu_addr = 0;
ring->fence_drv.sync_seq = 0;
atomic64_set(&ring->fence_drv.last_seq, 0);
atomic_set(&ring->fence_drv.last_seq, 0);
ring->fence_drv.initialized = false;
setup_timer(&ring->fence_drv.fallback_timer, amdgpu_fence_fallback,
@ -621,9 +610,9 @@ static int amdgpu_debugfs_fence_info(struct seq_file *m, void *data)
amdgpu_fence_process(ring);
seq_printf(m, "--- ring %d (%s) ---\n", i, ring->name);
seq_printf(m, "Last signaled fence 0x%016llx\n",
(unsigned long long)atomic64_read(&ring->fence_drv.last_seq));
seq_printf(m, "Last emitted 0x%016llx\n",
seq_printf(m, "Last signaled fence 0x%08x\n",
atomic_read(&ring->fence_drv.last_seq));
seq_printf(m, "Last emitted 0x%08x\n",
ring->fence_drv.sync_seq);
}
return 0;