cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mmap.c (4223B)

      1// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
      2/*
      3 * Copyright(c) 2016 Intel Corporation.
      4 */
      5
      6#include <linux/slab.h>
      7#include <linux/vmalloc.h>
      8#include <linux/mm.h>
      9#include <rdma/uverbs_ioctl.h>
     10#include "mmap.h"
     11
     12/**
     13 * rvt_mmap_init - init link list and lock for mem map
     14 * @rdi: rvt dev struct
     15 */
     16void rvt_mmap_init(struct rvt_dev_info *rdi)
     17{
     18	INIT_LIST_HEAD(&rdi->pending_mmaps);
     19	spin_lock_init(&rdi->pending_lock);
     20	rdi->mmap_offset = PAGE_SIZE;
     21	spin_lock_init(&rdi->mmap_offset_lock);
     22}
     23
     24/**
     25 * rvt_release_mmap_info - free mmap info structure
     26 * @ref: a pointer to the kref within struct rvt_mmap_info
     27 */
     28void rvt_release_mmap_info(struct kref *ref)
     29{
     30	struct rvt_mmap_info *ip =
     31		container_of(ref, struct rvt_mmap_info, ref);
     32	struct rvt_dev_info *rdi = ib_to_rvt(ip->context->device);
     33
     34	spin_lock_irq(&rdi->pending_lock);
     35	list_del(&ip->pending_mmaps);
     36	spin_unlock_irq(&rdi->pending_lock);
     37
     38	vfree(ip->obj);
     39	kfree(ip);
     40}
     41
     42static void rvt_vma_open(struct vm_area_struct *vma)
     43{
     44	struct rvt_mmap_info *ip = vma->vm_private_data;
     45
     46	kref_get(&ip->ref);
     47}
     48
     49static void rvt_vma_close(struct vm_area_struct *vma)
     50{
     51	struct rvt_mmap_info *ip = vma->vm_private_data;
     52
     53	kref_put(&ip->ref, rvt_release_mmap_info);
     54}
     55
     56static const struct vm_operations_struct rvt_vm_ops = {
     57	.open = rvt_vma_open,
     58	.close = rvt_vma_close,
     59};
     60
     61/**
     62 * rvt_mmap - create a new mmap region
     63 * @context: the IB user context of the process making the mmap() call
     64 * @vma: the VMA to be initialized
     65 *
     66 * Return: zero if the mmap is OK. Otherwise, return an errno.
     67 */
     68int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
     69{
     70	struct rvt_dev_info *rdi = ib_to_rvt(context->device);
     71	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
     72	unsigned long size = vma->vm_end - vma->vm_start;
     73	struct rvt_mmap_info *ip, *pp;
     74	int ret = -EINVAL;
     75
     76	/*
     77	 * Search the device's list of objects waiting for a mmap call.
     78	 * Normally, this list is very short since a call to create a
     79	 * CQ, QP, or SRQ is soon followed by a call to mmap().
     80	 */
     81	spin_lock_irq(&rdi->pending_lock);
     82	list_for_each_entry_safe(ip, pp, &rdi->pending_mmaps,
     83				 pending_mmaps) {
     84		/* Only the creator is allowed to mmap the object */
     85		if (context != ip->context || (__u64)offset != ip->offset)
     86			continue;
     87		/* Don't allow a mmap larger than the object. */
     88		if (size > ip->size)
     89			break;
     90
     91		list_del_init(&ip->pending_mmaps);
     92		spin_unlock_irq(&rdi->pending_lock);
     93
     94		ret = remap_vmalloc_range(vma, ip->obj, 0);
     95		if (ret)
     96			goto done;
     97		vma->vm_ops = &rvt_vm_ops;
     98		vma->vm_private_data = ip;
     99		rvt_vma_open(vma);
    100		goto done;
    101	}
    102	spin_unlock_irq(&rdi->pending_lock);
    103done:
    104	return ret;
    105}
    106
    107/**
    108 * rvt_create_mmap_info - allocate information for hfi1_mmap
    109 * @rdi: rvt dev struct
    110 * @size: size in bytes to map
    111 * @udata: user data (must be valid!)
    112 * @obj: opaque pointer to a cq, wq etc
    113 *
    114 * Return: rvt_mmap struct on success, ERR_PTR on failure
    115 */
    116struct rvt_mmap_info *rvt_create_mmap_info(struct rvt_dev_info *rdi, u32 size,
    117					   struct ib_udata *udata, void *obj)
    118{
    119	struct rvt_mmap_info *ip;
    120
    121	if (!udata)
    122		return ERR_PTR(-EINVAL);
    123
    124	ip = kmalloc_node(sizeof(*ip), GFP_KERNEL, rdi->dparms.node);
    125	if (!ip)
    126		return ERR_PTR(-ENOMEM);
    127
    128	size = PAGE_ALIGN(size);
    129
    130	spin_lock_irq(&rdi->mmap_offset_lock);
    131	if (rdi->mmap_offset == 0)
    132		rdi->mmap_offset = ALIGN(PAGE_SIZE, SHMLBA);
    133	ip->offset = rdi->mmap_offset;
    134	rdi->mmap_offset += ALIGN(size, SHMLBA);
    135	spin_unlock_irq(&rdi->mmap_offset_lock);
    136
    137	INIT_LIST_HEAD(&ip->pending_mmaps);
    138	ip->size = size;
    139	ip->context =
    140		container_of(udata, struct uverbs_attr_bundle, driver_udata)
    141			->context;
    142	ip->obj = obj;
    143	kref_init(&ip->ref);
    144
    145	return ip;
    146}
    147
    148/**
    149 * rvt_update_mmap_info - update a mem map
    150 * @rdi: rvt dev struct
    151 * @ip: mmap info pointer
    152 * @size: size to grow by
    153 * @obj: opaque pointer to cq, wq, etc.
    154 */
    155void rvt_update_mmap_info(struct rvt_dev_info *rdi, struct rvt_mmap_info *ip,
    156			  u32 size, void *obj)
    157{
    158	size = PAGE_ALIGN(size);
    159
    160	spin_lock_irq(&rdi->mmap_offset_lock);
    161	if (rdi->mmap_offset == 0)
    162		rdi->mmap_offset = PAGE_SIZE;
    163	ip->offset = rdi->mmap_offset;
    164	rdi->mmap_offset += size;
    165	spin_unlock_irq(&rdi->mmap_offset_lock);
    166
    167	ip->size = size;
    168	ip->obj = obj;
    169}