1 files changed, 61 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 000000000000..8171537dd7d1
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_ringbuffer.c
@@ -0,0 +1,61 @@
+/*
+ * 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 size)
+{
+        struct msm_ringbuffer *ring;
+        int ret;
+
+        size = ALIGN(size, 4);   /* size should be dword aligned */
+
+        ring = kzalloc(sizeof(*ring), GFP_KERNEL);
+        if (!ring) {
+                ret = -ENOMEM;
+                goto fail;
+        }
+
+        ring->gpu = gpu;
+        ring->bo = msm_gem_new(gpu->dev, size, MSM_BO_WC);
+        if (IS_ERR(ring->bo)) {
+                ret = PTR_ERR(ring->bo);
+                ring->bo = NULL;
+                goto fail;
+        }
+
+        ring->start = msm_gem_vaddr_locked(ring->bo);
+        ring->end   = ring->start + (size / 4);
+        ring->cur   = ring->start;
+
+        ring->size = size;
+
+        return ring;
+
+fail:
+        if (ring)
+                msm_ringbuffer_destroy(ring);
+        return ERR_PTR(ret);
+}
+
+void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
+{
+        if (ring->bo)
+                drm_gem_object_unreference(ring->bo);
+        kfree(ring);
+}