From 35161bbc135a748dd0a3c822030b3341cdefbd33 Mon Sep 17 00:00:00 2001 From: Andres Rodriguez Date: Tue, 26 Sep 2017 17:43:14 -0400 Subject: [PATCH] drm/amdgpu: map compute rings by least recently used pipe This patch provides a guarantee that the first n queues allocated by an application will be on different pipes. Where n is the number of pipes available from the hardware. This helps avoid ring aliasing which can result in work executing in time-sliced mode instead of truly parallel mode. Reviewed-by: Alex Deucher Signed-off-by: Andres Rodriguez Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_queue_mgr.c | 8 +++--- drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 25 +++++++++++++++---- drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h | 5 ++-- 3 files changed, 28 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_queue_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_queue_mgr.c index befc09b68543..190e28cb827e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_queue_mgr.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_queue_mgr.c @@ -121,7 +121,7 @@ static enum amdgpu_ring_type amdgpu_hw_ip_to_ring_type(int hw_ip) static int amdgpu_lru_map(struct amdgpu_device *adev, struct amdgpu_queue_mapper *mapper, - int user_ring, + int user_ring, bool lru_pipe_order, struct amdgpu_ring **out_ring) { int r, i, j; @@ -139,7 +139,7 @@ static int amdgpu_lru_map(struct amdgpu_device *adev, } r = amdgpu_ring_lru_get(adev, ring_type, ring_blacklist, - j, out_ring); + j, lru_pipe_order, out_ring); if (r) return r; @@ -284,8 +284,10 @@ int amdgpu_queue_mgr_map(struct amdgpu_device *adev, r = amdgpu_identity_map(adev, mapper, ring, out_ring); break; case AMDGPU_HW_IP_DMA: + r = amdgpu_lru_map(adev, mapper, ring, false, out_ring); + break; case AMDGPU_HW_IP_COMPUTE: - r = amdgpu_lru_map(adev, mapper, ring, out_ring); + r = amdgpu_lru_map(adev, mapper, ring, true, out_ring); break; default: *out_ring = NULL; diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c index 5ce65280b396..019932a7ea3a 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c @@ -315,14 +315,16 @@ static bool amdgpu_ring_is_blacklisted(struct amdgpu_ring *ring, * @type: amdgpu_ring_type enum * @blacklist: blacklisted ring ids array * @num_blacklist: number of entries in @blacklist + * @lru_pipe_order: find a ring from the least recently used pipe * @ring: output ring * * Retrieve the amdgpu_ring structure for the least recently used ring of * a specific IP block (all asics). * Returns 0 on success, error on failure. */ -int amdgpu_ring_lru_get(struct amdgpu_device *adev, int type, int *blacklist, - int num_blacklist, struct amdgpu_ring **ring) +int amdgpu_ring_lru_get(struct amdgpu_device *adev, int type, + int *blacklist, int num_blacklist, + bool lru_pipe_order, struct amdgpu_ring **ring) { struct amdgpu_ring *entry; @@ -337,10 +339,23 @@ int amdgpu_ring_lru_get(struct amdgpu_device *adev, int type, int *blacklist, if (amdgpu_ring_is_blacklisted(entry, blacklist, num_blacklist)) continue; - *ring = entry; - amdgpu_ring_lru_touch_locked(adev, *ring); - break; + if (!*ring) { + *ring = entry; + + /* We are done for ring LRU */ + if (!lru_pipe_order) + break; + } + + /* Move all rings on the same pipe to the end of the list */ + if (entry->pipe == (*ring)->pipe) + amdgpu_ring_lru_touch_locked(adev, entry); } + + /* Move the ring we found to the end of the list */ + if (*ring) + amdgpu_ring_lru_touch_locked(adev, *ring); + spin_unlock(&adev->ring_lru_list_lock); if (!*ring) { diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h index 322d25299a00..491bd5512dcc 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h @@ -201,8 +201,9 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring, unsigned ring_size, struct amdgpu_irq_src *irq_src, unsigned irq_type); void amdgpu_ring_fini(struct amdgpu_ring *ring); -int amdgpu_ring_lru_get(struct amdgpu_device *adev, int type, int *blacklist, - int num_blacklist, struct amdgpu_ring **ring); +int amdgpu_ring_lru_get(struct amdgpu_device *adev, int type, + int *blacklist, int num_blacklist, + bool lru_pipe_order, struct amdgpu_ring **ring); void amdgpu_ring_lru_touch(struct amdgpu_device *adev, struct amdgpu_ring *ring); static inline void amdgpu_ring_clear_ring(struct amdgpu_ring *ring) { -- 2.39.5