Include nvgpu headers

These are needed to build on NVIDIA's Jetson boards for the time
being. Only a couple structs are required, so it should be fairly
easy to remove this dependency at some point in the future.

1 files changed, 361 insertions, 0 deletions

diff --git a/include/nvgpu/dma.h b/include/nvgpu/dma.h
new file mode 100644
index 0000000..cbb829b
--- /dev/null
+++ b/include/nvgpu/dma.h
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+/*
+ * Copyright (c) 2017-2018, 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_DMA_H
+#define NVGPU_DMA_H
+
+#include <nvgpu/types.h>
+
+struct gk20a;
+struct vm_gk20a;
+struct nvgpu_mem;
+
+/*
+ * Flags for the below nvgpu_dma_{alloc,alloc_map}_flags*
+ */
+
+/*
+ * Don't create a virtual kernel mapping for the buffer but only allocate it;
+ * this may save some resources. The buffer can be mapped later explicitly.
+ */
+#define NVGPU_DMA_NO_KERNEL_MAPPING     BIT32(0)
+
+/*
+ * Don't allow building the buffer from individual pages but require a
+ * physically contiguous block.
+ */
+#define NVGPU_DMA_FORCE_CONTIGUOUS      BIT32(1)
+
+/*
+ * Make the mapping read-only.
+ */
+#define NVGPU_DMA_READ_ONLY             BIT32(2)
+
+/**
+ * nvgpu_iommuable - Check if GPU is behind IOMMU
+ *
+ * @g - The GPU.
+ *
+ * Returns true if the passed GPU is behind an IOMMU; false otherwise. If the
+ * GPU is iommuable then the DMA address in nvgpu_mem_sgl is valid.
+ *
+ * Note that even if a GPU is behind an IOMMU that does not necessarily mean the
+ * GPU _must_ use DMA addresses. GPUs may still use physical addresses if it
+ * makes sense.
+ */
+bool nvgpu_iommuable(struct gk20a *g);
+
+/**
+ * nvgpu_dma_alloc - Allocate DMA memory
+ *
+ * @g    - The GPU.
+ * @size - Size of the allocation in bytes.
+ * @mem  - Struct for storing the allocation information.
+ *
+ * Allocate memory suitable for doing DMA. Store the allocation info in @mem.
+ * Returns 0 on success and a suitable error code when there's an error. This
+ * memory can be either placed in VIDMEM or SYSMEM, which ever is more
+ * convenient for the driver.
+ */
+int nvgpu_dma_alloc(struct gk20a *g, size_t size, struct nvgpu_mem *mem);
+
+/**
+ * nvgpu_dma_alloc_flags - Allocate DMA memory
+ *
+ * @g     - The GPU.
+ * @flags - Flags modifying the operation of the DMA allocation.
+ * @size  - Size of the allocation in bytes.
+ * @mem   - Struct for storing the allocation information.
+ *
+ * Allocate memory suitable for doing DMA. Store the allocation info in @mem.
+ * Returns 0 on success and a suitable error code when there's an error. This
+ * memory can be either placed in VIDMEM or SYSMEM, which ever is more
+ * convenient for the driver.
+ *
+ * The following flags are accepted:
+ *
+ *   %NVGPU_DMA_NO_KERNEL_MAPPING
+ *   %NVGPU_DMA_FORCE_CONTIGUOUS
+ *   %NVGPU_DMA_READ_ONLY
+ */
+int nvgpu_dma_alloc_flags(struct gk20a *g, unsigned long flags, size_t size,
+                struct nvgpu_mem *mem);
+
+/**
+ * nvgpu_dma_alloc_sys - Allocate DMA memory
+ *
+ * @g    - The GPU.
+ * @size - Size of the allocation in bytes.
+ * @mem  - Struct for storing the allocation information.
+ *
+ * Allocate memory suitable for doing DMA. Store the allocation info in @mem.
+ * Returns 0 on success and a suitable error code when there's an error. This
+ * allocates memory specifically in SYSMEM.
+ */
+int nvgpu_dma_alloc_sys(struct gk20a *g, size_t size, struct nvgpu_mem *mem);
+
+/**
+ * nvgpu_dma_alloc_flags_sys - Allocate DMA memory
+ *
+ * @g     - The GPU.
+ * @flags - Flags modifying the operation of the DMA allocation.
+ * @size  - Size of the allocation in bytes.
+ * @mem   - Struct for storing the allocation information.
+ *
+ * Allocate memory suitable for doing DMA. Store the allocation info in @mem.
+ * Returns 0 on success and a suitable error code when there's an error. This
+ * allocates memory specifically in SYSMEM.
+ *
+ * The following flags are accepted:
+ *
+ *   %NVGPU_DMA_NO_KERNEL_MAPPING
+ *   %NVGPU_DMA_FORCE_CONTIGUOUS
+ *   %NVGPU_DMA_READ_ONLY
+ */
+int nvgpu_dma_alloc_flags_sys(struct gk20a *g, unsigned long flags,
+                size_t size, struct nvgpu_mem *mem);
+
+/**
+ * nvgpu_dma_alloc_vid - Allocate DMA memory
+ *
+ * @g    - The GPU.
+ * @size - Size of the allocation in bytes.
+ * @mem  - Struct for storing the allocation information.
+ *
+ * Allocate memory suitable for doing DMA. Store the allocation info in @mem.
+ * Returns 0 on success and a suitable error code when there's an error. This
+ * allocates memory specifically in VIDMEM.
+ */
+int nvgpu_dma_alloc_vid(struct gk20a *g, size_t size, struct nvgpu_mem *mem);
+
+/**
+ * nvgpu_dma_alloc_flags_vid - Allocate DMA memory
+ *
+ * @g     - The GPU.
+ * @flags - Flags modifying the operation of the DMA allocation.
+ * @size  - Size of the allocation in bytes.
+ * @mem   - Struct for storing the allocation information.
+ *
+ * Allocate memory suitable for doing DMA. Store the allocation info in @mem.
+ * Returns 0 on success and a suitable error code when there's an error. This
+ * allocates memory specifically in VIDMEM.
+ *
+ * Only the following flags are accepted:
+ *
+ *   %NVGPU_DMA_NO_KERNEL_MAPPING
+ *
+ */
+int nvgpu_dma_alloc_flags_vid(struct gk20a *g, unsigned long flags,
+                size_t size, struct nvgpu_mem *mem);
+
+
+/**
+ * nvgpu_dma_alloc_flags_vid_at - Allocate DMA memory
+ *
+ * @g     - The GPU.
+ * @size  - Size of the allocation in bytes.
+ * @mem   - Struct for storing the allocation information.
+ * @at    - A specific location to attempt to allocate memory from or 0 if the
+ *          caller does not care what the address is.
+ *
+ * Allocate memory suitable for doing DMA. Store the allocation info in @mem.
+ * Returns 0 on success and a suitable error code when there's an error. This
+ * allocates memory specifically in VIDMEM.
+ *
+ */
+int nvgpu_dma_alloc_vid_at(struct gk20a *g,
+                size_t size, struct nvgpu_mem *mem, u64 at);
+
+/**
+ * nvgpu_dma_alloc_flags_vid_at - Allocate DMA memory
+ *
+ * @g     - The GPU.
+ * @flags - Flags modifying the operation of the DMA allocation.
+ * @size  - Size of the allocation in bytes.
+ * @mem   - Struct for storing the allocation information.
+ * @at    - A specific location to attempt to allocate memory from or 0 if the
+ *          caller does not care what the address is.
+ *
+ * Allocate memory suitable for doing DMA. Store the allocation info in @mem.
+ * Returns 0 on success and a suitable error code when there's an error. This
+ * allocates memory specifically in VIDMEM.
+ *
+ * Only the following flags are accepted:
+ *
+ *   %NVGPU_DMA_NO_KERNEL_MAPPING
+ */
+int nvgpu_dma_alloc_flags_vid_at(struct gk20a *g, unsigned long flags,
+                size_t size, struct nvgpu_mem *mem, u64 at);
+
+/**
+ * nvgpu_dma_free - Free a DMA allocation
+ *
+ * @g   - The GPU.
+ * @mem - An allocation to free.
+ *
+ * Free memory created with any of:
+ *
+ *   nvgpu_dma_alloc()
+ *   nvgpu_dma_alloc_flags()
+ *   nvgpu_dma_alloc_sys()
+ *   nvgpu_dma_alloc_flags_sys()
+ *   nvgpu_dma_alloc_vid()
+ *   nvgpu_dma_alloc_flags_vid()
+ *   nvgpu_dma_alloc_flags_vid_at()
+ */