drm/msm: Support multiple ringbuffers

Add the infrastructure to support the idea of multiple ringbuffers.
Assign each ringbuffer an id and use that as an index for the various
ring specific operations.

The biggest delta is to support legacy fences. Each fence gets its own
sequence number but the legacy functions expect to use a unique integer.
To handle this we return a unique identifier for each submission but
map it to a specific ring/sequence under the covers. Newer users use
a dma_fence pointer anyway so they don't care about the actual sequence
ID or ring.

The actual mechanics for multiple ringbuffers are very target specific
so this code just allows for the possibility but still only defines
one ringbuffer for each target family.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

1 files changed, 24 insertions, 10 deletions

diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.c b/drivers/gpu/drm/msm/msm_ringbuffer.c
index bf065a540130..4db6ca719706 100644
--- a/drivers/gpu/drm/msm/msm_ringbuffer.c
+++ b/drivers/gpu/drm/msm/msm_ringbuffer.c
@@ -18,13 +18,15 @@
 #include "msm_ringbuffer.h"
 #include "msm_gpu.h"
 
-struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int size)
+struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
+		void *memptrs, uint64_t memptrs_iova)
 {
 	struct msm_ringbuffer *ring;
+	char name[32];
 	int ret;
 
-	if (WARN_ON(!is_power_of_2(size)))
-		return ERR_PTR(-EINVAL);
+	/* We assume everwhere that MSM_GPU_RINGBUFFER_SZ is a power of 2 */
+	BUILD_BUG_ON(!is_power_of_2(MSM_GPU_RINGBUFFER_SZ));
 
 	ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 	if (!ring) {
@@ -33,32 +35,44 @@ struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int size)
 	}
 
 	ring->gpu = gpu;
-
+	ring->id = id;
 	/* Pass NULL for the iova pointer - we will map it later */
-	ring->start = msm_gem_kernel_new(gpu->dev, size, MSM_BO_WC,
-		gpu->aspace, &ring->bo, NULL);
+	ring->start = msm_gem_kernel_new(gpu->dev, MSM_GPU_RINGBUFFER_SZ,
+		MSM_BO_WC, gpu->aspace, &ring->bo, NULL);
 
 	if (IS_ERR(ring->start)) {
 		ret = PTR_ERR(ring->start);
 		ring->start = 0;
 		goto fail;
 	}
-	ring->end   = ring->start + (size / 4);
+	ring->end   = ring->start + (MSM_GPU_RINGBUFFER_SZ >> 2);
 	ring->cur   = ring->start;
 
-	ring->size = size;
+	ring->memptrs = memptrs;
+	ring->memptrs_iova = memptrs_iova;
+
+	INIT_LIST_HEAD(&ring->submits);
+
+	snprintf(name, sizeof(name), "gpu-ring-%d", ring->id);
+
+	ring->fctx = msm_fence_context_alloc(gpu->dev, name);
 
 	return ring;
 
 fail:
-	if (ring)
-		msm_ringbuffer_destroy(ring);
+	msm_ringbuffer_destroy(ring);
 	return ERR_PTR(ret);
 }
 
 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
 {
+	if (IS_ERR_OR_NULL(ring))
+		return;
+
+	msm_fence_context_free(ring->fctx);
+
 	if (ring->bo) {
+		msm_gem_put_iova(ring->bo, ring->gpu->aspace);
 		msm_gem_put_vaddr(ring->bo);
 		drm_gem_object_unreference_unlocked(ring->bo);
 	}