gpu: nvgpu: Move dma_buf usage from mm_gk20a.c

Move most of the dma_buf usage present in the mm_gk20a.c code
out to Linux specific code and some commom/mm code. There's
two primary groups of code:

  1. dma_buf priv field code (for holding comptag data)
  2. Comptag usage that relies on dma_buf pointers

For (1) the dma_buf code was simply moved to common/linux/dmabuf.c
since most of this code is clearly Linux specific.

The comptag code was a bit more complicated since there is two
parts to the comptag code. Firstly there's the code that manages
the comptag memory. This is essentially a simple allocator. This
was moved to common/mm/comptags.c since it can be shared across
all chips. The second set of code is moved to
common/linux/comptags.c since it is the interface between dma_bufs
and the comptag memory.

Two other fixes were done as well:

 - Add struct gk20a to the comptag allocator init so that
   the proper nvgpu_vzalloc() function could be used.
 - Add necessary includes to common/linux/vm_priv.h.

JIRA NVGPU-30
JIRA NVGPU-138

Change-Id: I96c57f2763e5ebe18a2f2ee4b33e0e1a2597848c
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1566628
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/comptags.h b/drivers/gpu/nvgpu/include/nvgpu/comptags.h
new file mode 100644
index 00000000..6e3062ec
--- /dev/null
+++ b/drivers/gpu/nvgpu/include/nvgpu/comptags.h
@@ -0,0 +1,57 @@
+/*
+* Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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/>.
+ */
+
+#ifndef __NVGPU_COMPTAGS__
+#define __NVGPU_COMPTAGS__
+
+#include <nvgpu/lock.h>
+
+struct gk20a;
+
+struct gk20a_comptags {
+        u32 offset;
+        u32 lines;
+        u32 allocated_lines;
+        bool user_mappable;
+};
+
+struct gk20a_comptag_allocator {
+        struct gk20a *g;
+
+        struct nvgpu_mutex lock;
+
+        /* This bitmap starts at ctag 1. 0th cannot be taken. */
+        unsigned long *bitmap;
+
+        /* Size of bitmap, not max ctags, so one less. */
+        unsigned long size;
+};
+
+/* real size here, but first (ctag 0) isn't used */
+int gk20a_comptag_allocator_init(struct gk20a *g,
+                                 struct gk20a_comptag_allocator *allocator,
+                                 unsigned long size);
+void gk20a_comptag_allocator_destroy(struct gk20a *g,
+                                     struct gk20a_comptag_allocator *allocator);
+
+int gk20a_comptaglines_alloc(struct gk20a_comptag_allocator *allocator,
+                             u32 *offset, u32 len);
+void gk20a_comptaglines_free(struct gk20a_comptag_allocator *allocator,
+                             u32 offset, u32 len);
+
+
+
+#endif