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                 nvkm_vm_unmap(&vma->_vma);
  32                 vma->mem = NULL;
  33         }
  34 }
  35
  36 int
  37 nouveau_vma_map(struct nouveau_vma *vma, struct nouveau_mem *mem)
  38 {
  39         int ret = nouveau_mem_map(mem, vma->vmm->vm, &vma->_vma);
  40         if (ret)
  41                 return ret;
  42         vma->mem = mem;
  43         return 0;
  44 }
  45
  46 struct nouveau_vma *
  47 nouveau_vma_find(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm)
  48 {
  49         struct nouveau_vma *vma;
  50
  51         list_for_each_entry(vma, &nvbo->vma_list, head) {
  52                 if (vma->vmm == vmm)
  53                         return vma;
  54         }
  55
  56         return NULL;
  57 }
  58
  59 void
  60 nouveau_vma_del(struct nouveau_vma **pvma)
  61 {
  62         struct nouveau_vma *vma = *pvma;
  63         if (vma && --vma->refs <= 0) {
  64                 if (likely(vma->addr != ~0ULL))
  65                         nvkm_vm_put(&vma->_vma);
  66                 list_del(&vma->head);
  67                 *pvma = NULL;
  68                 kfree(*pvma);
  69         }
  70 }
  71
  72 int
  73 nouveau_vma_new(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm,
  74                 struct nouveau_vma **pvma)
  75 {
  76         struct nouveau_mem *mem = nouveau_mem(&nvbo->bo.mem);
  77         struct nouveau_vma *vma;
  78         int ret;
  79
  80         if ((vma = *pvma = nouveau_vma_find(nvbo, vmm))) {
  81                 vma->refs++;
  82                 return 0;
  83         }
  84
  85         if (!(vma = *pvma = kmalloc(sizeof(*vma), GFP_KERNEL)))
  86                 return -ENOMEM;
  87         vma->vmm = vmm;
  88         vma->refs = 1;
  89         vma->addr = ~0ULL;
  90         vma->mem = NULL;
  91         list_add_tail(&vma->head, &nvbo->vma_list);
  92
  93         if (nvbo->bo.mem.mem_type != TTM_PL_SYSTEM &&
  94             mem->mem.page == nvbo->page) {
  95                 ret = nvkm_vm_get(vmm->vm, mem->_mem->size << 12, mem->mem.page,
  96                                   NV_MEM_ACCESS_RW, &vma->_vma);
  97                 if (ret)
  98                         goto done;
  99
 100                 vma->addr = vma->_vma.offset;
 101                 ret = nouveau_vma_map(vma, mem);
 102         } else {
 103                 ret = nvkm_vm_get(vmm->vm, mem->_mem->size << 12, mem->mem.page,
 104                                   NV_MEM_ACCESS_RW, &vma->_vma);
 105                 vma->addr = vma->_vma.offset;
 106         }
 107
 108 done:
 109         if (ret)
 110                 nouveau_vma_del(pvma);
 111         return ret;
 112 }
 113
 114 void
 115 nouveau_vmm_fini(struct nouveau_vmm *vmm)
 116 {
 117         nvif_vmm_fini(&vmm->vmm);
 118         vmm->cli = NULL;
 119 }
 120
 121 int
 122 nouveau_vmm_init(struct nouveau_cli *cli, s32 oclass, struct nouveau_vmm *vmm)
 123 {
 124         int ret = nvif_vmm_init(&cli->mmu, oclass, PAGE_SIZE, 0, NULL, 0,
 125                                 &vmm->vmm);
 126         if (ret)
 127                 return ret;
 128
 129         vmm->cli = cli;
 130         vmm->vm = nvkm_uvmm(vmm->vmm.object.priv)->vmm;
 131         return 0;
 132 }