drm/etnaviv: share a single cmdbuf suballoc region across all GPUs

There is no need for each GPU to have it's own cmdbuf suballocation
region. Only allocate a single one for the the etnaviv virtual device
and share it across all GPUs.

As the suballoc space is now potentially shared by more hardware jobs
running in parallel, double its size to 512KB to avoid contention.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Guido Günther <agx@sigxcpu.org>

1 files changed, 4 insertions, 13 deletions

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
index f00547b88a13..179bc6c544ca 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -693,6 +693,7 @@ static void etnaviv_gpu_hw_init(struct etnaviv_gpu *gpu)
 
 int etnaviv_gpu_init(struct etnaviv_gpu *gpu)
 {
+	struct etnaviv_drm_private *priv = gpu->drm->dev_private;
 	int ret, i;
 
 	ret = pm_runtime_get_sync(gpu->dev);
@@ -760,23 +761,16 @@ int etnaviv_gpu_init(struct etnaviv_gpu *gpu)
 		goto fail;
 	}
 
-	gpu->cmdbuf_suballoc = etnaviv_cmdbuf_suballoc_new(gpu);
-	if (IS_ERR(gpu->cmdbuf_suballoc)) {
-		dev_err(gpu->dev, "Failed to create cmdbuf suballocator\n");
-		ret = PTR_ERR(gpu->cmdbuf_suballoc);
-		goto destroy_iommu;
-	}
-
-	ret = etnaviv_cmdbuf_suballoc_map(gpu->cmdbuf_suballoc, gpu->mmu,
+	ret = etnaviv_cmdbuf_suballoc_map(priv->cmdbuf_suballoc, gpu->mmu,
 					  &gpu->cmdbuf_mapping,
 					  gpu->memory_base);
 	if (ret) {
 		dev_err(gpu->dev, "failed to map cmdbuf suballoc\n");
-		goto destroy_suballoc;
+		goto destroy_iommu;
 	}
 
 	/* Create buffer: */
-	ret = etnaviv_cmdbuf_init(gpu->cmdbuf_suballoc, &gpu->buffer,
+	ret = etnaviv_cmdbuf_init(priv->cmdbuf_suballoc, &gpu->buffer,
 				  PAGE_SIZE);
 	if (ret) {
 		dev_err(gpu->dev, "could not create command buffer\n");
@@ -815,8 +809,6 @@ free_buffer:
 	etnaviv_cmdbuf_free(&gpu->buffer);
 unmap_suballoc:
 	etnaviv_cmdbuf_suballoc_unmap(gpu->mmu, &gpu->cmdbuf_mapping);
-destroy_suballoc:
-	etnaviv_cmdbuf_suballoc_destroy(gpu->cmdbuf_suballoc);
 destroy_iommu:
 	etnaviv_iommu_destroy(gpu->mmu);
 fail:
@@ -1692,7 +1684,6 @@ static void etnaviv_gpu_unbind(struct device *dev, struct device *master,
 	if (gpu->initialized) {
 		etnaviv_cmdbuf_free(&gpu->buffer);
 		etnaviv_cmdbuf_suballoc_unmap(gpu->mmu, &gpu->cmdbuf_mapping);
-		etnaviv_cmdbuf_suballoc_destroy(gpu->cmdbuf_suballoc);
 		etnaviv_iommu_destroy(gpu->mmu);
 		gpu->initialized = false;
 	}