drivers/gpu/drm/udl/udl_gem.c

   1 /*
   2  * Copyright (C) 2012 Red Hat
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License v2. See the file COPYING in the main directory of this archive for
   6  * more details.
   7  */
   8
   9 #include <drm/drmP.h>
  10 #include "udl_drv.h"
  11 #include <linux/shmem_fs.h>
  12 #include <linux/dma-buf.h>
  13
  14 struct udl_gem_object *udl_gem_alloc_object(struct drm_device *dev,
  15                                             size_t size)
  16 {
  17         struct udl_gem_object *obj;
  18
  19         obj = kzalloc(sizeof(*obj), GFP_KERNEL);
  20         if (obj == NULL)
  21                 return NULL;
  22
  23         if (drm_gem_object_init(dev, &obj->base, size) != 0) {
  24                 kfree(obj);
  25                 return NULL;
  26         }
  27
  28         return obj;
  29 }
  30
  31 static int
  32 udl_gem_create(struct drm_file *file,
  33                struct drm_device *dev,
  34                uint64_t size,
  35                uint32_t *handle_p)
  36 {
  37         struct udl_gem_object *obj;
  38         int ret;
  39         u32 handle;
  40
  41         size = roundup(size, PAGE_SIZE);
  42
  43         obj = udl_gem_alloc_object(dev, size);
  44         if (obj == NULL)
  45                 return -ENOMEM;
  46
  47         ret = drm_gem_handle_create(file, &obj->base, &handle);
  48         if (ret) {
  49                 drm_gem_object_release(&obj->base);
  50                 kfree(obj);
  51                 return ret;
  52         }
  53
  54         drm_gem_object_unreference(&obj->base);
  55         *handle_p = handle;
  56         return 0;
  57 }
  58
  59 int udl_dumb_create(struct drm_file *file,
  60                     struct drm_device *dev,
  61                     struct drm_mode_create_dumb *args)
  62 {
  63         args->pitch = args->width * ((args->bpp + 1) / 8);
  64         args->size = args->pitch * args->height;
  65         return udl_gem_create(file, dev,
  66                               args->size, &args->handle);
  67 }
  68
  69 int udl_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
  70 {
  71         int ret;
  72
  73         ret = drm_gem_mmap(filp, vma);
  74         if (ret)
  75                 return ret;
  76
  77         vma->vm_flags &= ~VM_PFNMAP;
  78         vma->vm_flags |= VM_MIXEDMAP;
  79
  80         return ret;
  81 }
  82
  83 int udl_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
  84 {
  85         struct udl_gem_object *obj = to_udl_bo(vma->vm_private_data);
  86         struct page *page;
  87         unsigned int page_offset;
  88         int ret = 0;
  89
  90         page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
  91                 PAGE_SHIFT;
  92
  93         if (!obj->pages)
  94                 return VM_FAULT_SIGBUS;
  95
  96         page = obj->pages[page_offset];
  97         ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
  98         switch (ret) {
  99         case -EAGAIN:
 100         case 0:
 101         case -ERESTARTSYS:
 102                 return VM_FAULT_NOPAGE;
 103         case -ENOMEM:
 104                 return VM_FAULT_OOM;
 105         default:
 106                 return VM_FAULT_SIGBUS;
 107         }
 108 }
 109
 110 int udl_gem_init_object(struct drm_gem_object *obj)
 111 {
 112         BUG();
 113
 114         return 0;
 115 }
 116
 117 static int udl_gem_get_pages(struct udl_gem_object *obj, gfp_t gfpmask)
 118 {
 119         struct page **pages;
 120
 121         if (obj->pages)
 122                 return 0;
 123
 124         pages = drm_gem_get_pages(&obj->base, gfpmask);
 125         if (IS_ERR(pages))
 126                 return PTR_ERR(pages);
 127
 128         obj->pages = pages;
 129
 130         return 0;
 131 }
 132
 133 static void udl_gem_put_pages(struct udl_gem_object *obj)
 134 {
 135         drm_gem_put_pages(&obj->base, obj->pages, false, false);
 136         obj->pages = NULL;
 137 }
 138
 139 int udl_gem_vmap(struct udl_gem_object *obj)
 140 {
 141         int page_count = obj->base.size / PAGE_SIZE;
 142         int ret;
 143
 144         if (obj->base.import_attach) {
 145                 obj->vmapping = dma_buf_vmap(obj->base.import_attach->dmabuf);
 146                 if (!obj->vmapping)
 147                         return -ENOMEM;
 148                 return 0;
 149         }
 150
 151         ret = udl_gem_get_pages(obj, GFP_KERNEL);
 152         if (ret)
 153                 return ret;
 154
 155         obj->vmapping = vmap(obj->pages, page_count, 0, PAGE_KERNEL);
 156         if (!obj->vmapping)
 157                 return -ENOMEM;
 158         return 0;
 159 }
 160
 161 void udl_gem_vunmap(struct udl_gem_object *obj)
 162 {
 163         if (obj->base.import_attach) {
 164                 dma_buf_vunmap(obj->base.import_attach->dmabuf, obj->vmapping);
 165                 return;
 166         }
 167
 168         if (obj->vmapping)
 169                 vunmap(obj->vmapping);
 170
 171         udl_gem_put_pages(obj);
 172 }
 173
 174 void udl_gem_free_object(struct drm_gem_object *gem_obj)
 175 {
 176         struct udl_gem_object *obj = to_udl_bo(gem_obj);
 177
 178         if (obj->vmapping)
 179                 udl_gem_vunmap(obj);
 180
 181         if (gem_obj->import_attach)
 182                 drm_prime_gem_destroy(gem_obj, obj->sg);
 183
 184         if (obj->pages)
 185                 udl_gem_put_pages(obj);
 186
 187         drm_gem_free_mmap_offset(gem_obj);
 188 }
 189
 190 /* the dumb interface doesn't work with the GEM straight MMAP
 191    interface, it expects to do MMAP on the drm fd, like normal */
 192 int udl_gem_mmap(struct drm_file *file, struct drm_device *dev,
 193                  uint32_t handle, uint64_t *offset)
 194 {
 195         struct udl_gem_object *gobj;
 196         struct drm_gem_object *obj;
 197         int ret = 0;
 198
 199         mutex_lock(&dev->struct_mutex);
 200         obj = drm_gem_object_lookup(dev, file, handle);
 201         if (obj == NULL) {
 202                 ret = -ENOENT;
 203                 goto unlock;
 204         }
 205         gobj = to_udl_bo(obj);
 206
 207         ret = udl_gem_get_pages(gobj, GFP_KERNEL);
 208         if (ret)
 209                 goto out;
 210         ret = drm_gem_create_mmap_offset(obj);
 211         if (ret)
 212                 goto out;
 213
 214         *offset = drm_vma_node_offset_addr(&gobj->base.vma_node);
 215
 216 out:
 217         drm_gem_object_unreference(&gobj->base);
 218 unlock:
 219         mutex_unlock(&dev->struct_mutex);
 220         return ret;
 221 }
 222
 223 static int udl_prime_create(struct drm_device *dev,
 224                             size_t size,
 225                             struct sg_table *sg,
 226                             struct udl_gem_object **obj_p)
 227 {
 228         struct udl_gem_object *obj;
 229         int npages;
 230
 231         npages = size / PAGE_SIZE;
 232
 233         *obj_p = NULL;
 234         obj = udl_gem_alloc_object(dev, npages * PAGE_SIZE);
 235         if (!obj)
 236                 return -ENOMEM;
 237
 238         obj->sg = sg;
 239         obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
 240         if (obj->pages == NULL) {
 241                 DRM_ERROR("obj pages is NULL %d\n", npages);
 242                 return -ENOMEM;
 243         }
 244
 245         drm_prime_sg_to_page_addr_arrays(sg, obj->pages, NULL, npages);
 246
 247         *obj_p = obj;
 248         return 0;
 249 }
 250
 251 struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev,
 252                                 struct dma_buf *dma_buf)
 253 {
 254         struct dma_buf_attachment *attach;
 255         struct sg_table *sg;
 256         struct udl_gem_object *uobj;
 257         int ret;
 258
 259         /* need to attach */
 260         attach = dma_buf_attach(dma_buf, dev->dev);
 261         if (IS_ERR(attach))
 262                 return ERR_CAST(attach);
 263
 264         get_dma_buf(dma_buf);
 265
 266         sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
 267         if (IS_ERR(sg)) {
 268                 ret = PTR_ERR(sg);
 269                 goto fail_detach;
 270         }
 271
 272         ret = udl_prime_create(dev, dma_buf->size, sg, &uobj);
 273         if (ret) {
 274                 goto fail_unmap;
 275         }
 276
 277         uobj->base.import_attach = attach;
 278
 279         return &uobj->base;
 280
 281 fail_unmap:
 282         dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
 283 fail_detach:
 284         dma_buf_detach(dma_buf, attach);
 285         dma_buf_put(dma_buf);
 286
 287         return ERR_PTR(ret);
 288 }