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_dumb_destroy(struct drm_file *file, struct drm_device *dev,
  70                      uint32_t handle)
  71 {
  72         return drm_gem_handle_delete(file, handle);
  73 }
  74
  75 int udl_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
  76 {
  77         int ret;
  78
  79         ret = drm_gem_mmap(filp, vma);
  80         if (ret)
  81                 return ret;
  82
  83         vma->vm_flags &= ~VM_PFNMAP;
  84         vma->vm_flags |= VM_MIXEDMAP;
  85
  86         return ret;
  87 }
  88
  89 int udl_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
  90 {
  91         struct udl_gem_object *obj = to_udl_bo(vma->vm_private_data);
  92         struct page *page;
  93         unsigned int page_offset;
  94         int ret = 0;
  95
  96         page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
  97                 PAGE_SHIFT;
  98
  99         if (!obj->pages)
 100                 return VM_FAULT_SIGBUS;
 101
 102         page = obj->pages[page_offset];
 103         ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
 104         switch (ret) {
 105         case -EAGAIN:
 106                 set_need_resched();
 107         case 0:
 108         case -ERESTARTSYS:
 109                 return VM_FAULT_NOPAGE;
 110         case -ENOMEM:
 111                 return VM_FAULT_OOM;
 112         default:
 113                 return VM_FAULT_SIGBUS;
 114         }
 115 }
 116
 117 int udl_gem_init_object(struct drm_gem_object *obj)
 118 {
 119         BUG();
 120
 121         return 0;
 122 }
 123
 124 static int udl_gem_get_pages(struct udl_gem_object *obj, gfp_t gfpmask)
 125 {
 126         int page_count, i;
 127         struct page *page;
 128         struct inode *inode;
 129         struct address_space *mapping;
 130
 131         if (obj->pages)
 132                 return 0;
 133
 134         page_count = obj->base.size / PAGE_SIZE;
 135         BUG_ON(obj->pages != NULL);
 136         obj->pages = drm_malloc_ab(page_count, sizeof(struct page *));
 137         if (obj->pages == NULL)
 138                 return -ENOMEM;
 139
 140         inode = file_inode(obj->base.filp);
 141         mapping = inode->i_mapping;
 142         gfpmask |= mapping_gfp_mask(mapping);
 143
 144         for (i = 0; i < page_count; i++) {
 145                 page = shmem_read_mapping_page_gfp(mapping, i, gfpmask);
 146                 if (IS_ERR(page))
 147                         goto err_pages;
 148                 obj->pages[i] = page;
 149         }
 150
 151         return 0;
 152 err_pages:
 153         while (i--)
 154                 page_cache_release(obj->pages[i]);
 155         drm_free_large(obj->pages);
 156         obj->pages = NULL;
 157         return PTR_ERR(page);
 158 }
 159
 160 static void udl_gem_put_pages(struct udl_gem_object *obj)
 161 {
 162         int page_count = obj->base.size / PAGE_SIZE;
 163         int i;
 164
 165         if (obj->base.import_attach) {
 166                 drm_free_large(obj->pages);
 167                 obj->pages = NULL;
 168                 return;
 169         }
 170
 171         for (i = 0; i < page_count; i++)
 172                 page_cache_release(obj->pages[i]);
 173
 174         drm_free_large(obj->pages);
 175         obj->pages = NULL;
 176 }
 177
 178 int udl_gem_vmap(struct udl_gem_object *obj)
 179 {
 180         int page_count = obj->base.size / PAGE_SIZE;
 181         int ret;
 182
 183         if (obj->base.import_attach) {
 184                 obj->vmapping = dma_buf_vmap(obj->base.import_attach->dmabuf);
 185                 if (!obj->vmapping)
 186                         return -ENOMEM;
 187                 return 0;
 188         }
 189
 190         ret = udl_gem_get_pages(obj, GFP_KERNEL);
 191         if (ret)
 192                 return ret;
 193
 194         obj->vmapping = vmap(obj->pages, page_count, 0, PAGE_KERNEL);
 195         if (!obj->vmapping)
 196                 return -ENOMEM;
 197         return 0;
 198 }
 199
 200 void udl_gem_vunmap(struct udl_gem_object *obj)
 201 {
 202         if (obj->base.import_attach) {
 203                 dma_buf_vunmap(obj->base.import_attach->dmabuf, obj->vmapping);
 204                 return;
 205         }
 206
 207         if (obj->vmapping)
 208                 vunmap(obj->vmapping);
 209
 210         udl_gem_put_pages(obj);
 211 }
 212
 213 void udl_gem_free_object(struct drm_gem_object *gem_obj)
 214 {
 215         struct udl_gem_object *obj = to_udl_bo(gem_obj);
 216
 217         if (obj->vmapping)
 218                 udl_gem_vunmap(obj);
 219
 220         if (gem_obj->import_attach)
 221                 drm_prime_gem_destroy(gem_obj, obj->sg);
 222
 223         if (obj->pages)
 224                 udl_gem_put_pages(obj);
 225
 226         if (gem_obj->map_list.map)
 227                 drm_gem_free_mmap_offset(gem_obj);
 228 }
 229
 230 /* the dumb interface doesn't work with the GEM straight MMAP
 231    interface, it expects to do MMAP on the drm fd, like normal */
 232 int udl_gem_mmap(struct drm_file *file, struct drm_device *dev,
 233                  uint32_t handle, uint64_t *offset)
 234 {
 235         struct udl_gem_object *gobj;
 236         struct drm_gem_object *obj;
 237         int ret = 0;
 238
 239         mutex_lock(&dev->struct_mutex);
 240         obj = drm_gem_object_lookup(dev, file, handle);
 241         if (obj == NULL) {
 242                 ret = -ENOENT;
 243                 goto unlock;
 244         }
 245         gobj = to_udl_bo(obj);
 246
 247         ret = udl_gem_get_pages(gobj, GFP_KERNEL);
 248         if (ret)
 249                 goto out;
 250         if (!gobj->base.map_list.map) {
 251                 ret = drm_gem_create_mmap_offset(obj);
 252                 if (ret)
 253                         goto out;
 254         }
 255
 256         *offset = (u64)gobj->base.map_list.hash.key << PAGE_SHIFT;
 257
 258 out:
 259         drm_gem_object_unreference(&gobj->base);
 260 unlock:
 261         mutex_unlock(&dev->struct_mutex);
 262         return ret;
 263 }
 264
 265 static int udl_prime_create(struct drm_device *dev,
 266                             size_t size,
 267                             struct sg_table *sg,
 268                             struct udl_gem_object **obj_p)
 269 {
 270         struct udl_gem_object *obj;
 271         int npages;
 272
 273         npages = size / PAGE_SIZE;
 274
 275         *obj_p = NULL;
 276         obj = udl_gem_alloc_object(dev, npages * PAGE_SIZE);
 277         if (!obj)
 278                 return -ENOMEM;
 279
 280         obj->sg = sg;
 281         obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
 282         if (obj->pages == NULL) {
 283                 DRM_ERROR("obj pages is NULL %d\n", npages);
 284                 return -ENOMEM;
 285         }
 286
 287         drm_prime_sg_to_page_addr_arrays(sg, obj->pages, NULL, npages);
 288
 289         *obj_p = obj;
 290         return 0;
 291 }
 292
 293 struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev,
 294                                 struct dma_buf *dma_buf)
 295 {
 296         struct dma_buf_attachment *attach;
 297         struct sg_table *sg;
 298         struct udl_gem_object *uobj;
 299         int ret;
 300
 301         /* need to attach */
 302         attach = dma_buf_attach(dma_buf, dev->dev);
 303         if (IS_ERR(attach))
 304                 return ERR_CAST(attach);
 305
 306         sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
 307         if (IS_ERR(sg)) {
 308                 ret = PTR_ERR(sg);
 309                 goto fail_detach;
 310         }
 311
 312         ret = udl_prime_create(dev, dma_buf->size, sg, &uobj);
 313         if (ret) {
 314                 goto fail_unmap;
 315         }
 316
 317         uobj->base.import_attach = attach;
 318
 319         return &uobj->base;
 320
 321 fail_unmap:
 322         dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
 323 fail_detach:
 324         dma_buf_detach(dma_buf, attach);
 325         return ERR_PTR(ret);
 326 }