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/*
* 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_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 (1 << 0)
/*
* Don't allow building the buffer from individual pages but require a
* physically contiguous block.
*/
#define NVGPU_DMA_FORCE_CONTIGUOUS (1 << 1)
/*
* Make the mapping read-only.
*/
#define NVGPU_DMA_READ_ONLY (1 << 2)
/**
* 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.
* @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, dma_addr_t 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()
*/
void nvgpu_dma_free(struct gk20a *g, struct nvgpu_mem *mem);
/**
* nvgpu_dma_alloc_map - Allocate DMA memory and map into GMMU.
*
* @vm - VM context for GMMU mapping.
* @size - Size of the allocation in bytes.
* @mem - Struct for storing the allocation information.
*
* Allocate memory suitable for doing DMA and map that memory into the GMMU.
* Note this is different than mapping it into the CPU. This memory can be
* either placed in VIDMEM or SYSMEM, which ever is more convenient for the
* driver.
*/
int nvgpu_dma_alloc_map(struct vm_gk20a *vm, size_t size,
struct nvgpu_mem *mem);
/**
* nvgpu_dma_alloc_map_flags - Allocate DMA memory and map into GMMU.
*
* @vm - VM context for GMMU mapping.
* @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 and map that memory into the GMMU.
* Note this is different than mapping it into the CPU. This memory can be
* either placed in VIDMEM or SYSMEM, which ever is more convenient for the
* driver.
*
* This version passes @flags on to the underlying DMA allocation. The accepted
* flags are:
*
* %NVGPU_DMA_NO_KERNEL_MAPPING
* %NVGPU_DMA_FORCE_CONTIGUOUS
* %NVGPU_DMA_READ_ONLY
*/
int nvgpu_dma_alloc_map_flags(struct vm_gk20a *vm, unsigned long flags,
size_t size, struct nvgpu_mem *mem);
/**
* nvgpu_dma_alloc_map_sys - Allocate DMA memory and map into GMMU.
*
* @vm - VM context for GMMU mapping.
* @size - Size of the allocation in bytes.
* @mem - Struct for storing the allocation information.
*
* Allocate memory suitable for doing DMA and map that memory into the GMMU.
* This memory will be placed in SYSMEM.
*/
int nvgpu_dma_alloc_map_sys(struct vm_gk20a *vm, size_t size,
struct nvgpu_mem *mem);
/**
* nvgpu_dma_alloc_map_flags_sys - Allocate DMA memory and map into GMMU.
*
* @vm - VM context for GMMU mapping.
* @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 and map that memory into the GMMU.
* This memory will be placed in SYSMEM.
*
* This version passes @flags on to the underlying DMA allocation. The accepted
* flags are:
*
* %NVGPU_DMA_NO_KERNEL_MAPPING
* %NVGPU_DMA_FORCE_CONTIGUOUS
* %NVGPU_DMA_READ_ONLY
*/
int nvgpu_dma_alloc_map_flags_sys(struct vm_gk20a *vm, unsigned long flags,
size_t size, struct nvgpu_mem *mem);
/**
* nvgpu_dma_alloc_map_vid - Allocate DMA memory and map into GMMU.
*
* @vm - VM context for GMMU mapping.
* @size - Size of the allocation in bytes.
* @mem - Struct for storing the allocation information.
*
* Allocate memory suitable for doing DMA and map that memory into the GMMU.
* This memory will be placed in VIDMEM.
*/
int nvgpu_dma_alloc_map_vid(struct vm_gk20a *vm, size_t size,
struct nvgpu_mem *mem);
/**
* nvgpu_dma_alloc_map_flags_vid - Allocate DMA memory and map into GMMU.
*
* @vm - VM context for GMMU mapping.
* @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 and map that memory into the GMMU.
* This memory will be placed in VIDMEM.
*
* This version passes @flags on to the underlying DMA allocation. The accepted
* flags are:
*
* %NVGPU_DMA_NO_KERNEL_MAPPING
* %NVGPU_DMA_FORCE_CONTIGUOUS
* %NVGPU_DMA_READ_ONLY
*/
int nvgpu_dma_alloc_map_flags_vid(struct vm_gk20a *vm, unsigned long flags,
size_t size, struct nvgpu_mem *mem);
/**
* nvgpu_dma_unmap_free - Free a DMA allocation
*
* @g - The GPU.
* @mem - An allocation to free.
*
* Free memory created with any of:
*
* nvgpu_dma_alloc_map()
* nvgpu_dma_alloc_map_flags()
* nvgpu_dma_alloc_map_sys()
* nvgpu_dma_alloc_map_flags_sys()
* nvgpu_dma_alloc_map_vid()
* nvgpu_dma_alloc_map_flags_vid()
*/
void nvgpu_dma_unmap_free(struct vm_gk20a *vm, struct nvgpu_mem *mem);
#endif
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