gpu: nvgpu: Split VIDMEM support from mm_gk20a.c

Split VIDMEM support into its own code files organized as such:

  common/mm/vidmem.c     - Base vidmem support
  common/linux/vidmem.c  - Linux specific user-space interaction
  include/nvgpu/vidmem.h - Vidmem API definitions

Also use the config to enable/disable VIDMEM support in the makefile
and remove as many CONFIG_GK20A_VIDMEM preprocessor checks as possible
from the source code.

And lastly update a while-loop that iterated over an SGT to use the
new for_each construct for iterating over SGTs.

Currently this organization is not perfectly adhered to. More patches
will fix that.

JIRA NVGPU-30
JIRA NVGPU-138

Change-Id: Ic0f4d2cf38b65849c7dc350a69b175421477069c
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1540705
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 139 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/vidmem.h b/drivers/gpu/nvgpu/include/nvgpu/vidmem.h
new file mode 100644
index 00000000..a5d0ae11
--- /dev/null
+++ b/drivers/gpu/nvgpu/include/nvgpu/vidmem.h
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __NVGPU_VIDMEM_H__
+#define __NVGPU_VIDMEM_H__
+
+#include <nvgpu/types.h>
+#include <nvgpu/errno.h>
+
+struct scatterlist;
+struct dma_buf;
+struct work_struct;
+
+struct gk20a;
+struct mm_gk20a;
+struct nvgpu_mem;
+
+struct gk20a_vidmem_buf {
+        struct gk20a *g;
+        struct nvgpu_mem *mem;
+        struct dma_buf *dmabuf;
+        void *dmabuf_priv;
+        void (*dmabuf_priv_delete)(void *);
+};
+
+#if defined(CONFIG_GK20A_VIDMEM)
+
+struct nvgpu_page_alloc *get_vidmem_page_alloc(struct scatterlist *sgl);
+void set_vidmem_page_alloc(struct scatterlist *sgl, u64 addr);
+bool is_vidmem_page_alloc(u64 addr);
+int gk20a_vidmem_buf_alloc(struct gk20a *g, size_t bytes);
+int gk20a_vidmem_get_space(struct gk20a *g, u64 *space);
+
+struct nvgpu_mem *get_pending_mem_desc(struct mm_gk20a *mm);
+
+void gk20a_vidmem_destroy(struct gk20a *g);
+int gk20a_init_vidmem(struct mm_gk20a *mm);
+int gk20a_vidmem_clear_all(struct gk20a *g);
+
+void gk20a_vidmem_clear_mem_worker(struct work_struct *work);
+int gk20a_gmmu_clear_vidmem_mem(struct gk20a *g, struct nvgpu_mem *mem);
+
+/*
+ * Will need to be moved later on once we have the Linux vidmem.h file.
+ */
+struct gk20a *gk20a_vidmem_buf_owner(struct dma_buf *dmabuf);
+int gk20a_vidbuf_access_memory(struct gk20a *g, struct dma_buf *dmabuf,
+                void *buffer, u64 offset, u64 size, u32 cmd);
+
+#else /* !defined(CONFIG_GK20A_VIDMEM) */
+
+/*
+ * When VIDMEM support is not present this interface is used.
+ */
+
+static inline struct nvgpu_page_alloc *
+get_vidmem_page_alloc(struct scatterlist *sgl)
+{
+        return NULL;
+}
+
+static inline void set_vidmem_page_alloc(struct scatterlist *sgl, u64 addr)
+{
+}
+
+static inline bool is_vidmem_page_alloc(u64 addr)
+{
+        return false;
+}
+
+static inline int gk20a_vidmem_buf_alloc(struct gk20a *g, size_t bytes)
+{
+        return -ENOSYS;
+}
+static inline int gk20a_vidmem_get_space(struct gk20a *g, u64 *space)
+{
+        return -ENOSYS;
+}
+
+static inline struct nvgpu_mem *get_pending_mem_desc(struct mm_gk20a *mm)
+{
+        return NULL;
+}
+
+static inline void gk20a_vidmem_destroy(struct gk20a *g)
+{
+}
+
+static inline int gk20a_init_vidmem(struct mm_gk20a *mm)
+{
+        return 0;
+}
+
+static inline int gk20a_vidmem_clear_all(struct gk20a *g)
+{
+        return -ENOSYS;
+}
+
+static inline int gk20a_gmmu_clear_vidmem_mem(struct gk20a *g,
+                                              struct nvgpu_mem *mem)
+{
+        return -ENOSYS;
+}
+
+static inline struct gk20a *gk20a_vidmem_buf_owner(struct dma_buf *dmabuf)
+{
+        return NULL;
+}
+
+static inline int gk20a_vidbuf_access_memory(struct gk20a *g,
+                                             struct dma_buf *dmabuf,
+                                             void *buffer, u64 offset,
+                                             u64 size, u32 cmd)
+{
+        return -ENOSYS;
+}
+
+#endif /* !defined(CONFIG_GK20A_VIDMEM) */
+
+#endif /* __NVGPU_VIDMEM_H__ */