drivers/gpu/drm/nouveau/nouveau_prime.c

   1 /*
   2  * Copyright 2011 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  * Authors: Dave Airlie
  23  */
  24
  25 #include "drmP.h"
  26 #include "drm.h"
  27
  28 #include "nouveau_drv.h"
  29 #include "nouveau_drm.h"
  30 #include "nouveau_dma.h"
  31
  32 #include <linux/dma-buf.h>
  33
  34 static struct sg_table *nouveau_gem_map_dma_buf(struct dma_buf_attachment *attachment,
  35                                           enum dma_data_direction dir)
  36 {
  37         struct nouveau_bo *nvbo = attachment->dmabuf->priv;
  38         struct drm_device *dev = nvbo->gem->dev;
  39         int npages = nvbo->bo.num_pages;
  40         struct sg_table *sg;
  41         int nents;
  42
  43         mutex_lock(&dev->struct_mutex);
  44         sg = drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages);
  45         nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
  46         mutex_unlock(&dev->struct_mutex);
  47         return sg;
  48 }
  49
  50 static void nouveau_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
  51                                       struct sg_table *sg, enum dma_data_direction dir)
  52 {
  53         dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
  54         sg_free_table(sg);
  55         kfree(sg);
  56 }
  57
  58 static void nouveau_gem_dmabuf_release(struct dma_buf *dma_buf)
  59 {
  60         struct nouveau_bo *nvbo = dma_buf->priv;
  61
  62         if (nvbo->gem->export_dma_buf == dma_buf) {
  63                 nvbo->gem->export_dma_buf = NULL;
  64                 drm_gem_object_unreference_unlocked(nvbo->gem);
  65         }
  66 }
  67
  68 static void *nouveau_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
  69 {
  70         return NULL;
  71 }
  72
  73 static void nouveau_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
  74 {
  75
  76 }
  77 static void *nouveau_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num)
  78 {
  79         return NULL;
  80 }
  81
  82 static void nouveau_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
  83 {
  84
  85 }
  86
  87 static int nouveau_gem_prime_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
  88 {
  89         return -EINVAL;
  90 }
  91
  92 static void *nouveau_gem_prime_vmap(struct dma_buf *dma_buf)
  93 {
  94         struct nouveau_bo *nvbo = dma_buf->priv;
  95         struct drm_device *dev = nvbo->gem->dev;
  96         int ret;
  97
  98         mutex_lock(&dev->struct_mutex);
  99         if (nvbo->vmapping_count) {
 100                 nvbo->vmapping_count++;
 101                 goto out_unlock;
 102         }
 103
 104         ret = ttm_bo_kmap(&nvbo->bo, 0, nvbo->bo.num_pages,
 105                           &nvbo->dma_buf_vmap);
 106         if (ret) {
 107                 mutex_unlock(&dev->struct_mutex);
 108                 return ERR_PTR(ret);
 109         }
 110         nvbo->vmapping_count = 1;
 111 out_unlock:
 112         mutex_unlock(&dev->struct_mutex);
 113         return nvbo->dma_buf_vmap.virtual;
 114 }
 115
 116 static void nouveau_gem_prime_vunmap(struct dma_buf *dma_buf, void *vaddr)
 117 {
 118         struct nouveau_bo *nvbo = dma_buf->priv;
 119         struct drm_device *dev = nvbo->gem->dev;
 120
 121         mutex_lock(&dev->struct_mutex);
 122         nvbo->vmapping_count--;
 123         if (nvbo->vmapping_count == 0) {
 124                 ttm_bo_kunmap(&nvbo->dma_buf_vmap);
 125         }
 126         mutex_unlock(&dev->struct_mutex);
 127 }
 128
 129 static const struct dma_buf_ops nouveau_dmabuf_ops =  {
 130         .map_dma_buf = nouveau_gem_map_dma_buf,
 131         .unmap_dma_buf = nouveau_gem_unmap_dma_buf,
 132         .release = nouveau_gem_dmabuf_release,
 133         .kmap = nouveau_gem_kmap,
 134         .kmap_atomic = nouveau_gem_kmap_atomic,
 135         .kunmap = nouveau_gem_kunmap,
 136         .kunmap_atomic = nouveau_gem_kunmap_atomic,
 137         .mmap = nouveau_gem_prime_mmap,
 138         .vmap = nouveau_gem_prime_vmap,
 139         .vunmap = nouveau_gem_prime_vunmap,
 140 };
 141
 142 static int
 143 nouveau_prime_new(struct drm_device *dev,
 144                   size_t size,
 145                   struct sg_table *sg,
 146                   struct nouveau_bo **pnvbo)
 147 {
 148         struct nouveau_bo *nvbo;
 149         u32 flags = 0;
 150         int ret;
 151
 152         flags = TTM_PL_FLAG_TT;
 153
 154         ret = nouveau_bo_new(dev, size, 0, flags, 0, 0,
 155                              sg, pnvbo);
 156         if (ret)
 157                 return ret;
 158         nvbo = *pnvbo;
 159
 160         /* we restrict allowed domains on nv50+ to only the types
 161          * that were requested at creation time.  not possibly on
 162          * earlier chips without busting the ABI.
 163          */
 164         nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
 165         nvbo->gem = drm_gem_object_alloc(dev, nvbo->bo.mem.size);
 166         if (!nvbo->gem) {
 167                 nouveau_bo_ref(NULL, pnvbo);
 168                 return -ENOMEM;
 169         }
 170
 171         nvbo->gem->driver_private = nvbo;
 172         return 0;
 173 }
 174
 175 struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev,
 176                                 struct drm_gem_object *obj, int flags)
 177 {
 178         struct nouveau_bo *nvbo = nouveau_gem_object(obj);
 179         int ret = 0;
 180
 181         /* pin buffer into GTT */
 182         ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT);
 183         if (ret)
 184                 return ERR_PTR(-EINVAL);
 185
 186         return dma_buf_export(nvbo, &nouveau_dmabuf_ops, obj->size, flags);
 187 }
 188
 189 struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev,
 190                                 struct dma_buf *dma_buf)
 191 {
 192         struct dma_buf_attachment *attach;
 193         struct sg_table *sg;
 194         struct nouveau_bo *nvbo;
 195         int ret;
 196
 197         if (dma_buf->ops == &nouveau_dmabuf_ops) {
 198                 nvbo = dma_buf->priv;
 199                 if (nvbo->gem) {
 200                         if (nvbo->gem->dev == dev) {
 201                                 drm_gem_object_reference(nvbo->gem);
 202                                 return nvbo->gem;
 203                         }
 204                 }
 205         }
 206         /* need to attach */
 207         attach = dma_buf_attach(dma_buf, dev->dev);
 208         if (IS_ERR(attach))
 209                 return ERR_PTR(PTR_ERR(attach));
 210
 211         sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
 212         if (IS_ERR(sg)) {
 213                 ret = PTR_ERR(sg);
 214                 goto fail_detach;
 215         }
 216
 217         ret = nouveau_prime_new(dev, dma_buf->size, sg, &nvbo);
 218         if (ret)
 219                 goto fail_unmap;
 220
 221         nvbo->gem->import_attach = attach;
 222
 223         return nvbo->gem;
 224
 225 fail_unmap:
 226         dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
 227 fail_detach:
 228         dma_buf_detach(dma_buf, attach);
 229         return ERR_PTR(ret);
 230 }
 231