1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.c b/drivers/gpu/drm/msm/msm_ringbuffer.c
new file mode 100644
index 000000000..6f5295b3f
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_ringbuffer.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "msm_ringbuffer.h"
+#include "msm_gpu.h"
+
+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;
+
+	/* 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) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	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, 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 + (MSM_GPU_RINGBUFFER_SZ >> 2);
+	ring->next  = ring->start;
+	ring->cur   = ring->start;
+
+	ring->memptrs = memptrs;
+	ring->memptrs_iova = memptrs_iova;
+
+	INIT_LIST_HEAD(&ring->submits);
+	spin_lock_init(&ring->lock);
+
+	snprintf(name, sizeof(name), "gpu-ring-%d", ring->id);
+
+	ring->fctx = msm_fence_context_alloc(gpu->dev, name);
+
+	return ring;
+
+fail:
+	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_put_unlocked(ring->bo);
+	}
+	kfree(ring);
+}