Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpu / drm / msm / msm_ringbuffer.c

diff --git a/kernel/drivers/gpu/drm/msm/msm_ringbuffer.c b/kernel/drivers/gpu/drm/msm/msm_ringbuffer.c
new file mode 100644 (file)
index 0000000..1f14b90
--- /dev/null
+++ b/kernel/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_unlocked(ring->bo);
+       kfree(ring);
+}