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authorRob Clark <robdclark@gmail.com>2013-07-19 18:59:32 +0200
committerRob Clark <robdclark@gmail.com>2013-08-24 20:57:18 +0200
commit7198e6b03155f6dadecadba004eb83b81a6ffe4c (patch)
treeed4ae3e859fd9a722524242a145008d13606a95a /drivers/gpu/drm/msm/msm_ringbuffer.c
parentdrm/msm: add register definitions for gpu (diff)
downloadlinux-7198e6b03155f6dadecadba004eb83b81a6ffe4c.tar.xz
linux-7198e6b03155f6dadecadba004eb83b81a6ffe4c.zip
drm/msm: add a3xx gpu support
Add initial support for a3xx 3d core. So far, with hardware that I've seen to date, we can have: + zero, one, or two z180 2d cores + a3xx or a2xx 3d core, which share a common CP (the firmware for the CP seems to implement some different PM4 packet types but the basics of cmdstream submission are the same) Which means that the eventual complete "class" hierarchy, once support for all past and present hw is in place, becomes: + msm_gpu + adreno_gpu + a3xx_gpu + a2xx_gpu + z180_gpu This commit splits out the parts that will eventually be common between a2xx/a3xx into adreno_gpu, and the parts that are even common to z180 into msm_gpu. Note that there is no cmdstream validation required. All memory access from the GPU is via IOMMU/MMU. So as long as you don't map silly things to the GPU, there isn't much damage that the GPU can do. Signed-off-by: Rob Clark <robdclark@gmail.com>
Diffstat (limited to 'drivers/gpu/drm/msm/msm_ringbuffer.c')
-rw-r--r--drivers/gpu/drm/msm/msm_ringbuffer.c61
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);
+}