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/*
* Copyright (c) 2018-2019, 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 __NVIDIA_P2P_H__
#define __NVIDIA_P2P_H__
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/mmu_notifier.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#define NVIDIA_P2P_UNINITIALIZED 0x0
#define NVIDIA_P2P_PINNED 0x1
#define NVIDIA_P2P_MAPPED 0x2
enum nvidia_p2p_page_size_type {
NVIDIA_P2P_PAGE_SIZE_4KB = 0,
NVIDIA_P2P_PAGE_SIZE_64KB,
NVIDIA_P2P_PAGE_SIZE_128KB,
NVIDIA_P2P_PAGE_SIZE_COUNT
};
struct nvidia_p2p_page_table {
u32 page_size;
u64 size;
u32 entries;
struct page **pages;
u64 vaddr;
u32 mapped;
struct mm_struct *mm;
struct mmu_notifier mn;
struct mutex lock;
void (*free_callback)(void *data);
void *data;
};
struct nvidia_p2p_dma_mapping {
dma_addr_t *hw_address;
u32 *hw_len;
u32 entries;
struct sg_table *sgt;
struct device *dev;
struct nvidia_p2p_page_table *page_table;
enum dma_data_direction direction;
};
/*
* @brief
* Make the pages underlying a range of GPU virtual memory
* accessible to a third-party device.
*
* @param[in] vaddr
* A GPU Virtual Address
* @param[in] size
* The size of the requested mapping.
* Size must be a multiple of Page size.
* @param[out] **page_table
* A pointer to struct nvidia_p2p_page_table
* @param[in] free_callback
* A non-NULL pointer to the function to be invoked when the pages
* underlying the virtual address range are freed
* implicitly. Must be non NULL.
* @param[in] data
* A non-NULL opaque pointer to private data to be passed to the
* callback function.
*
* @return
* 0 upon successful completion.
* Negative number if any error
*/
int nvidia_p2p_get_pages(u64 vaddr, u64 size,
struct nvidia_p2p_page_table **page_table,
void (*free_callback)(void *data), void *data);
/*
* @brief
* Release the pages previously made accessible to
* a third-party device.
*
* @param[in] *page_table
* A pointer to struct nvidia_p2p_page_table
*
* @return
* 0 upon successful completion.
* -ENOMEM if the driver failed to allocate memory or if
* insufficient resources were available to complete the operation.
* Negative number if any other error
*/
int nvidia_p2p_put_pages(struct nvidia_p2p_page_table *page_table);
/*
* @brief
* Release the pages previously made accessible to
* a third-party device. This is called during the
* execution of the free_callback().
*
* @param[in] *page_table
* A pointer to struct nvidia_p2p_page_table
*
* @return
* 0 upon successful completion.
* -ENOMEM if the driver failed to allocate memory or if
* insufficient resources were available to complete the operation.
* Negative number if any other error
*/
int nvidia_p2p_free_page_table(struct nvidia_p2p_page_table *page_table);
/*
* @brief
* Map the pages retrieved using nvidia_p2p_get_pages and
* pass the dma address to a third-party device.
*
* @param[in] *dev
* The peer device that needs to DMA to/from the
* mapping.
* @param[in] *page_table
* A pointer to struct nvidia_p2p_page_table
* @param[out] **map
* A pointer to struct nvidia_p2p_dma_mapping.
* The DMA mapping containing the DMA addresses to use.
* @param[in] direction
* DMA direction
*
* @return
* 0 upon successful completion.
* Negative number if any other error
*/
int nvidia_p2p_map_pages(struct device *dev,
struct nvidia_p2p_page_table *page_table,
struct nvidia_p2p_dma_mapping **map,
enum dma_data_direction direction);
/*
* @brief
* Unmap the pages previously mapped using nvidia_p2p_map_pages
*
* @param[in] *map
* A pointer to struct nvidia_p2p_dma_mapping.
* The DMA mapping containing the DMA addresses to use.
*
* @return
* 0 upon successful completion.
* Negative number if any other error
*/
int nvidia_p2p_unmap_pages(struct nvidia_p2p_dma_mapping *map);
/*
* @brief
* Unmap the pages previously mapped using nvidia_p2p_map_pages.
* This is called during the execution of the free_callback().
*
* @param[in] *map
* A pointer to struct nvidia_p2p_dma_mapping.
* The DMA mapping containing the DMA addresses to use.
*
* @return
* 0 upon successful completion.
* Negative number if any other error
*/
int nvidia_p2p_free_dma_mapping(struct nvidia_p2p_dma_mapping *dma_mapping);
#endif
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