cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

nouveau_vmm.c (3486B)

      1/*
      2 * Copyright 2017 Red Hat Inc.
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice shall be included in
     12 * all copies or substantial portions of the Software.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 * OTHER DEALINGS IN THE SOFTWARE.
     21 */
     22#include "nouveau_vmm.h"
     23#include "nouveau_drv.h"
     24#include "nouveau_bo.h"
     25#include "nouveau_svm.h"
     26#include "nouveau_mem.h"
     27
     28void
     29nouveau_vma_unmap(struct nouveau_vma *vma)
     30{
     31	if (vma->mem) {
     32		nvif_vmm_unmap(&vma->vmm->vmm, vma->addr);
     33		vma->mem = NULL;
     34	}
     35}
     36
     37int
     38nouveau_vma_map(struct nouveau_vma *vma, struct nouveau_mem *mem)
     39{
     40	struct nvif_vma tmp = { .addr = vma->addr };
     41	int ret = nouveau_mem_map(mem, &vma->vmm->vmm, &tmp);
     42	if (ret)
     43		return ret;
     44	vma->mem = mem;
     45	return 0;
     46}
     47
     48struct nouveau_vma *
     49nouveau_vma_find(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm)
     50{
     51	struct nouveau_vma *vma;
     52
     53	list_for_each_entry(vma, &nvbo->vma_list, head) {
     54		if (vma->vmm == vmm)
     55			return vma;
     56	}
     57
     58	return NULL;
     59}
     60
     61void
     62nouveau_vma_del(struct nouveau_vma **pvma)
     63{
     64	struct nouveau_vma *vma = *pvma;
     65	if (vma && --vma->refs <= 0) {
     66		if (likely(vma->addr != ~0ULL)) {
     67			struct nvif_vma tmp = { .addr = vma->addr, .size = 1 };
     68			nvif_vmm_put(&vma->vmm->vmm, &tmp);
     69		}
     70		list_del(&vma->head);
     71		kfree(*pvma);
     72	}
     73	*pvma = NULL;
     74}
     75
     76int
     77nouveau_vma_new(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm,
     78		struct nouveau_vma **pvma)
     79{
     80	struct nouveau_mem *mem = nouveau_mem(nvbo->bo.resource);
     81	struct nouveau_vma *vma;
     82	struct nvif_vma tmp;
     83	int ret;
     84
     85	if ((vma = *pvma = nouveau_vma_find(nvbo, vmm))) {
     86		vma->refs++;
     87		return 0;
     88	}
     89
     90	if (!(vma = *pvma = kmalloc(sizeof(*vma), GFP_KERNEL)))
     91		return -ENOMEM;
     92	vma->vmm = vmm;
     93	vma->refs = 1;
     94	vma->addr = ~0ULL;
     95	vma->mem = NULL;
     96	vma->fence = NULL;
     97	list_add_tail(&vma->head, &nvbo->vma_list);
     98
     99	if (nvbo->bo.resource->mem_type != TTM_PL_SYSTEM &&
    100	    mem->mem.page == nvbo->page) {
    101		ret = nvif_vmm_get(&vmm->vmm, LAZY, false, mem->mem.page, 0,
    102				   mem->mem.size, &tmp);
    103		if (ret)
    104			goto done;
    105
    106		vma->addr = tmp.addr;
    107		ret = nouveau_vma_map(vma, mem);
    108	} else {
    109		ret = nvif_vmm_get(&vmm->vmm, PTES, false, mem->mem.page, 0,
    110				   mem->mem.size, &tmp);
    111		vma->addr = tmp.addr;
    112	}
    113
    114done:
    115	if (ret)
    116		nouveau_vma_del(pvma);
    117	return ret;
    118}
    119
    120void
    121nouveau_vmm_fini(struct nouveau_vmm *vmm)
    122{
    123	nouveau_svmm_fini(&vmm->svmm);
    124	nvif_vmm_dtor(&vmm->vmm);
    125	vmm->cli = NULL;
    126}
    127
    128int
    129nouveau_vmm_init(struct nouveau_cli *cli, s32 oclass, struct nouveau_vmm *vmm)
    130{
    131	int ret = nvif_vmm_ctor(&cli->mmu, "drmVmm", oclass, false, PAGE_SIZE,
    132				0, NULL, 0, &vmm->vmm);
    133	if (ret)
    134		return ret;
    135
    136	vmm->cli = cli;
    137	return 0;
    138}