drivers/gpu/drm/nouveau/nouveau_vmm.c

   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
  28 void
  29 nouveau_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
  37 int
  38 nouveau_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
  48 struct nouveau_vma *
  49 nouveau_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
  61 void
  62 nouveau_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
  76 int
  77 nouveau_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.mem);
  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.mem.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
 114 done:
 115         if (ret)
 116                 nouveau_vma_del(pvma);
 117         return ret;
 118 }
 119
 120 void
 121 nouveau_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
 128 int
 129 nouveau_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 }