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 static int udl_gem_get_pages(struct udl_gem_object *obj, gfp_t gfpmask)
 111 {
 112         struct page **pages;
 113
 114         if (obj->pages)
 115                 return 0;
 116
 117         pages = drm_gem_get_pages(&obj->base, gfpmask);
 118         if (IS_ERR(pages))
 119                 return PTR_ERR(pages);
 120
 121         obj->pages = pages;
 122
 123         return 0;
 124 }
 125
 126 static void udl_gem_put_pages(struct udl_gem_object *obj)
 127 {
 128         drm_gem_put_pages(&obj->base, obj->pages, false, false);
 129         obj->pages = NULL;
 130 }
 131
 132 int udl_gem_vmap(struct udl_gem_object *obj)
 133 {
 134         int page_count = obj->base.size / PAGE_SIZE;
 135         int ret;
 136
 137         if (obj->base.import_attach) {
 138                 obj->vmapping = dma_buf_vmap(obj->base.import_attach->dmabuf);
 139                 if (!obj->vmapping)
 140                         return -ENOMEM;
 141                 return 0;
 142         }
 143
 144         ret = udl_gem_get_pages(obj, GFP_KERNEL);
 145         if (ret)
 146                 return ret;
 147
 148         obj->vmapping = vmap(obj->pages, page_count, 0, PAGE_KERNEL);
 149         if (!obj->vmapping)
 150                 return -ENOMEM;
 151         return 0;
 152 }
 153
 154 void udl_gem_vunmap(struct udl_gem_object *obj)
 155 {
 156         if (obj->base.import_attach) {
 157                 dma_buf_vunmap(obj->base.import_attach->dmabuf, obj->vmapping);
 158                 return;
 159         }
 160
 161         if (obj->vmapping)
 162                 vunmap(obj->vmapping);
 163
 164         udl_gem_put_pages(obj);
 165 }
 166
 167 void udl_gem_free_object(struct drm_gem_object *gem_obj)
 168 {
 169         struct udl_gem_object *obj = to_udl_bo(gem_obj);
 170
 171         if (obj->vmapping)
 172                 udl_gem_vunmap(obj);
 173
 174         if (gem_obj->import_attach)
 175                 drm_prime_gem_destroy(gem_obj, obj->sg);
 176
 177         if (obj->pages)
 178                 udl_gem_put_pages(obj);
 179
 180         drm_gem_free_mmap_offset(gem_obj);
 181 }
 182
 183 /* the dumb interface doesn't work with the GEM straight MMAP
 184    interface, it expects to do MMAP on the drm fd, like normal */
 185 int udl_gem_mmap(struct drm_file *file, struct drm_device *dev,
 186                  uint32_t handle, uint64_t *offset)
 187 {
 188         struct udl_gem_object *gobj;
 189         struct drm_gem_object *obj;
 190         int ret = 0;
 191
 192         mutex_lock(&dev->struct_mutex);
 193         obj = drm_gem_object_lookup(dev, file, handle);
 194         if (obj == NULL) {
 195                 ret = -ENOENT;
 196                 goto unlock;
 197         }
 198         gobj = to_udl_bo(obj);
 199
 200         ret = udl_gem_get_pages(gobj, GFP_KERNEL);
 201         if (ret)
 202                 goto out;
 203         ret = drm_gem_create_mmap_offset(obj);
 204         if (ret)
 205                 goto out;
 206
 207         *offset = drm_vma_node_offset_addr(&gobj->base.vma_node);
 208
 209 out:
 210         drm_gem_object_unreference(&gobj->base);
 211 unlock:
 212         mutex_unlock(&dev->struct_mutex);
 213         return ret;
 214 }
 215
 216 static int udl_prime_create(struct drm_device *dev,
 217                             size_t size,
 218                             struct sg_table *sg,
 219                             struct udl_gem_object **obj_p)
 220 {
 221         struct udl_gem_object *obj;
 222         int npages;
 223
 224         npages = size / PAGE_SIZE;
 225
 226         *obj_p = NULL;
 227         obj = udl_gem_alloc_object(dev, npages * PAGE_SIZE);
 228         if (!obj)
 229                 return -ENOMEM;
 230
 231         obj->sg = sg;
 232         obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
 233         if (obj->pages == NULL) {
 234                 DRM_ERROR("obj pages is NULL %d\n", npages);
 235                 return -ENOMEM;
 236         }
 237
 238         drm_prime_sg_to_page_addr_arrays(sg, obj->pages, NULL, npages);
 239
 240         *obj_p = obj;
 241         return 0;
 242 }
 243
 244 struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev,
 245                                 struct dma_buf *dma_buf)
 246 {
 247         struct dma_buf_attachment *attach;
 248         struct sg_table *sg;
 249         struct udl_gem_object *uobj;
 250         int ret;
 251
 252         /* need to attach */
 253         attach = dma_buf_attach(dma_buf, dev->dev);
 254         if (IS_ERR(attach))
 255                 return ERR_CAST(attach);
 256
 257         get_dma_buf(dma_buf);
 258
 259         sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
 260         if (IS_ERR(sg)) {
 261                 ret = PTR_ERR(sg);
 262                 goto fail_detach;
 263         }
 264
 265         ret = udl_prime_create(dev, dma_buf->size, sg, &uobj);
 266         if (ret) {
 267                 goto fail_unmap;
 268         }
 269
 270         uobj->base.import_attach = attach;
 271
 272         return &uobj->base;
 273
 274 fail_unmap:
 275         dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
 276 fail_detach:
 277         dma_buf_detach(dma_buf, attach);
 278         dma_buf_put(dma_buf);
 279
 280         return ERR_PTR(ret);
 281 }