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_mem.h"
  26
  27 void
  28 nouveau_vma_unmap(struct nouveau_vma *vma)
  29 {
  30         if (vma->mem) {
  31                 nvif_vmm_unmap(&vma->vmm->vmm, vma->addr);
  32                 vma->mem = NULL;
  33         }
  34 }
  35
  36 int
  37 nouveau_vma_map(struct nouveau_vma *vma, struct nouveau_mem *mem)
  38 {
  39         struct nvif_vma tmp = { .addr = vma->addr };
  40         int ret = nouveau_mem_map(mem, &vma->vmm->vmm, &tmp);
  41         if (ret)
  42                 return ret;
  43         vma->mem = mem;
  44         return 0;
  45 }
  46
  47 struct nouveau_vma *
  48 nouveau_vma_find(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm)
  49 {
  50         struct nouveau_vma *vma;
  51
  52         list_for_each_entry(vma, &nvbo->vma_list, head) {
  53                 if (vma->vmm == vmm)
  54                         return vma;
  55         }
  56
  57         return NULL;
  58 }
  59
  60 void
  61 nouveau_vma_del(struct nouveau_vma **pvma)
  62 {
  63         struct nouveau_vma *vma = *pvma;
  64         if (vma && --vma->refs <= 0) {
  65                 if (likely(vma->addr != ~0ULL)) {
  66                         struct nvif_vma tmp = { .addr = vma->addr, .size = 1 };
  67                         nvif_vmm_put(&vma->vmm->vmm, &tmp);
  68                 }
  69                 list_del(&vma->head);
  70                 *pvma = NULL;
  71                 kfree(*pvma);
  72         }
  73 }
  74
  75 int
  76 nouveau_vma_new(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm,
  77                 struct nouveau_vma **pvma)
  78 {
  79         struct nouveau_mem *mem = nouveau_mem(&nvbo->bo.mem);
  80         struct nouveau_vma *vma;
  81         struct nvif_vma tmp;
  82         int ret;
  83
  84         if ((vma = *pvma = nouveau_vma_find(nvbo, vmm))) {
  85                 vma->refs++;
  86                 return 0;
  87         }
  88
  89         if (!(vma = *pvma = kmalloc(sizeof(*vma), GFP_KERNEL)))
  90                 return -ENOMEM;
  91         vma->vmm = vmm;
  92         vma->refs = 1;
  93         vma->addr = ~0ULL;
  94         vma->mem = NULL;
  95         list_add_tail(&vma->head, &nvbo->vma_list);
  96
  97         if (nvbo->bo.mem.mem_type != TTM_PL_SYSTEM &&
  98             mem->mem.page == nvbo->page) {
  99                 ret = nvif_vmm_get(&vmm->vmm, LAZY, false, mem->mem.page, 0,
 100                                    mem->mem.size, &tmp);
 101                 if (ret)
 102                         goto done;
 103
 104                 vma->addr = tmp.addr;
 105                 ret = nouveau_vma_map(vma, mem);
 106         } else {
 107                 ret = nvif_vmm_get(&vmm->vmm, PTES, false, mem->mem.page, 0,
 108                                    mem->mem.size, &tmp);
 109                 vma->addr = tmp.addr;
 110         }
 111
 112 done:
 113         if (ret)
 114                 nouveau_vma_del(pvma);
 115         return ret;
 116 }
 117
 118 void
 119 nouveau_vmm_fini(struct nouveau_vmm *vmm)
 120 {
 121         nvif_vmm_fini(&vmm->vmm);
 122         vmm->cli = NULL;
 123 }
 124
 125 int
 126 nouveau_vmm_init(struct nouveau_cli *cli, s32 oclass, struct nouveau_vmm *vmm)
 127 {
 128         int ret = nvif_vmm_init(&cli->mmu, oclass, PAGE_SIZE, 0, NULL, 0,
 129                                 &vmm->vmm);
 130         if (ret)
 131                 return ret;
 132
 133         vmm->cli = cli;
 134         return 0;
 135 }