linux/drivers/infiniband/sw/rdmavt/mmap.c

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright(c) 2016 Intel Corporation.
 */

#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <rdma/uverbs_ioctl.h>
#include "mmap.h"

/**
 * rvt_mmap_init - init link list and lock for mem map
 * @rdi: rvt dev struct
 */
void rvt_mmap_init(struct rvt_dev_info *rdi)
{ … }

/**
 * rvt_release_mmap_info - free mmap info structure
 * @ref: a pointer to the kref within struct rvt_mmap_info
 */
void rvt_release_mmap_info(struct kref *ref)
{ … }

static void rvt_vma_open(struct vm_area_struct *vma)
{ … }

static void rvt_vma_close(struct vm_area_struct *vma)
{ … }

static const struct vm_operations_struct rvt_vm_ops = …;

/**
 * rvt_mmap - create a new mmap region
 * @context: the IB user context of the process making the mmap() call
 * @vma: the VMA to be initialized
 *
 * Return: zero if the mmap is OK. Otherwise, return an errno.
 */
int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
{ … }

/**
 * rvt_create_mmap_info - allocate information for hfi1_mmap
 * @rdi: rvt dev struct
 * @size: size in bytes to map
 * @udata: user data (must be valid!)
 * @obj: opaque pointer to a cq, wq etc
 *
 * Return: rvt_mmap struct on success, ERR_PTR on failure
 */
struct rvt_mmap_info *rvt_create_mmap_info(struct rvt_dev_info *rdi, u32 size,
					   struct ib_udata *udata, void *obj)
{ … }

/**
 * rvt_update_mmap_info - update a mem map
 * @rdi: rvt dev struct
 * @ip: mmap info pointer
 * @size: size to grow by
 * @obj: opaque pointer to cq, wq, etc.
 */
void rvt_update_mmap_info(struct rvt_dev_info *rdi, struct rvt_mmap_info *ip,
			  u32 size, void *obj)
{ … }