drivers/gpu/drm/cirrus/cirrus_main.c

   1 /*
   2  * Copyright 2012 Red Hat
   3  *
   4  * This file is subject to the terms and conditions of the GNU General
   5  * Public License version 2. See the file COPYING in the main
   6  * directory of this archive for more details.
   7  *
   8  * Authors: Matthew Garrett
   9  *          Dave Airlie
  10  */
  11 #include <drm/drmP.h>
  12 #include <drm/drm_crtc_helper.h>
  13
  14 #include "cirrus_drv.h"
  15
  16 static int cirrus_create_handle(struct drm_framebuffer *fb,
  17                                 struct drm_file* file_priv,
  18                                 unsigned int* handle)
  19 {
  20         struct cirrus_framebuffer *cirrus_fb = to_cirrus_framebuffer(fb);
  21
  22         return drm_gem_handle_create(file_priv, cirrus_fb->obj, handle);
  23 }
  24
  25 static void cirrus_user_framebuffer_destroy(struct drm_framebuffer *fb)
  26 {
  27         struct cirrus_framebuffer *cirrus_fb = to_cirrus_framebuffer(fb);
  28
  29         drm_gem_object_put_unlocked(cirrus_fb->obj);
  30         drm_framebuffer_cleanup(fb);
  31         kfree(fb);
  32 }
  33
  34 static const struct drm_framebuffer_funcs cirrus_fb_funcs = {
  35         .create_handle = cirrus_create_handle,
  36         .destroy = cirrus_user_framebuffer_destroy,
  37 };
  38
  39 int cirrus_framebuffer_init(struct drm_device *dev,
  40                             struct cirrus_framebuffer *gfb,
  41                             const struct drm_mode_fb_cmd2 *mode_cmd,
  42                             struct drm_gem_object *obj)
  43 {
  44         int ret;
  45
  46         drm_helper_mode_fill_fb_struct(dev, &gfb->base, mode_cmd);
  47         gfb->obj = obj;
  48         ret = drm_framebuffer_init(dev, &gfb->base, &cirrus_fb_funcs);
  49         if (ret) {
  50                 DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
  51                 return ret;
  52         }
  53         return 0;
  54 }
  55
  56 static struct drm_framebuffer *
  57 cirrus_user_framebuffer_create(struct drm_device *dev,
  58                                struct drm_file *filp,
  59                                const struct drm_mode_fb_cmd2 *mode_cmd)
  60 {
  61         struct cirrus_device *cdev = dev->dev_private;
  62         struct drm_gem_object *obj;
  63         struct cirrus_framebuffer *cirrus_fb;
  64         u32 bpp;
  65         int ret;
  66
  67         bpp = drm_format_plane_cpp(mode_cmd->pixel_format, 0) * 8;
  68
  69         if (!cirrus_check_framebuffer(cdev, mode_cmd->width, mode_cmd->height,
  70                                       bpp, mode_cmd->pitches[0]))
  71                 return ERR_PTR(-EINVAL);
  72
  73         obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
  74         if (obj == NULL)
  75                 return ERR_PTR(-ENOENT);
  76
  77         cirrus_fb = kzalloc(sizeof(*cirrus_fb), GFP_KERNEL);
  78         if (!cirrus_fb) {
  79                 drm_gem_object_put_unlocked(obj);
  80                 return ERR_PTR(-ENOMEM);
  81         }
  82
  83         ret = cirrus_framebuffer_init(dev, cirrus_fb, mode_cmd, obj);
  84         if (ret) {
  85                 drm_gem_object_put_unlocked(obj);
  86                 kfree(cirrus_fb);
  87                 return ERR_PTR(ret);
  88         }
  89         return &cirrus_fb->base;
  90 }
  91
  92 static const struct drm_mode_config_funcs cirrus_mode_funcs = {
  93         .fb_create = cirrus_user_framebuffer_create,
  94 };
  95
  96 /* Unmap the framebuffer from the core and release the memory */
  97 static void cirrus_vram_fini(struct cirrus_device *cdev)
  98 {
  99         iounmap(cdev->rmmio);
 100         cdev->rmmio = NULL;
 101         if (cdev->mc.vram_base)
 102                 release_mem_region(cdev->mc.vram_base, cdev->mc.vram_size);
 103 }
 104
 105 /* Map the framebuffer from the card and configure the core */
 106 static int cirrus_vram_init(struct cirrus_device *cdev)
 107 {
 108         /* BAR 0 is VRAM */
 109         cdev->mc.vram_base = pci_resource_start(cdev->dev->pdev, 0);
 110         cdev->mc.vram_size = pci_resource_len(cdev->dev->pdev, 0);
 111
 112         if (!request_mem_region(cdev->mc.vram_base, cdev->mc.vram_size,
 113                                 "cirrusdrmfb_vram")) {
 114                 DRM_ERROR("can't reserve VRAM\n");
 115                 return -ENXIO;
 116         }
 117
 118         return 0;
 119 }
 120
 121 /*
 122  * Our emulated hardware has two sets of memory. One is video RAM and can
 123  * simply be used as a linear framebuffer - the other provides mmio access
 124  * to the display registers. The latter can also be accessed via IO port
 125  * access, but we map the range and use mmio to program them instead
 126  */
 127
 128 int cirrus_device_init(struct cirrus_device *cdev,
 129                        struct drm_device *ddev,
 130                        struct pci_dev *pdev, uint32_t flags)
 131 {
 132         int ret;
 133
 134         cdev->dev = ddev;
 135         cdev->flags = flags;
 136
 137         /* Hardcode the number of CRTCs to 1 */
 138         cdev->num_crtc = 1;
 139
 140         /* BAR 0 is the framebuffer, BAR 1 contains registers */
 141         cdev->rmmio_base = pci_resource_start(cdev->dev->pdev, 1);
 142         cdev->rmmio_size = pci_resource_len(cdev->dev->pdev, 1);
 143
 144         if (!request_mem_region(cdev->rmmio_base, cdev->rmmio_size,
 145                                 "cirrusdrmfb_mmio")) {
 146                 DRM_ERROR("can't reserve mmio registers\n");
 147                 return -ENOMEM;
 148         }
 149
 150         cdev->rmmio = ioremap(cdev->rmmio_base, cdev->rmmio_size);
 151
 152         if (cdev->rmmio == NULL)
 153                 return -ENOMEM;
 154
 155         ret = cirrus_vram_init(cdev);
 156         if (ret) {
 157                 release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
 158                 return ret;
 159         }
 160
 161         return 0;
 162 }
 163
 164 void cirrus_device_fini(struct cirrus_device *cdev)
 165 {
 166         release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
 167         cirrus_vram_fini(cdev);
 168 }
 169
 170 /*
 171  * Functions here will be called by the core once it's bound the driver to
 172  * a PCI device
 173  */
 174
 175 int cirrus_driver_load(struct drm_device *dev, unsigned long flags)
 176 {
 177         struct cirrus_device *cdev;
 178         int r;
 179
 180         cdev = kzalloc(sizeof(struct cirrus_device), GFP_KERNEL);
 181         if (cdev == NULL)
 182                 return -ENOMEM;
 183         dev->dev_private = (void *)cdev;
 184
 185         r = cirrus_device_init(cdev, dev, dev->pdev, flags);
 186         if (r) {
 187                 dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
 188                 goto out;
 189         }
 190
 191         r = cirrus_mm_init(cdev);
 192         if (r) {
 193                 dev_err(&dev->pdev->dev, "fatal err on mm init\n");
 194                 goto out;
 195         }
 196
 197         /*
 198          * cirrus_modeset_init() is initializing/registering the emulated fbdev
 199          * and DRM internals can access/test some of the fields in
 200          * mode_config->funcs as part of the fbdev registration process.
 201          * Make sure dev->mode_config.funcs is properly set to avoid
 202          * dereferencing a NULL pointer.
 203          * FIXME: mode_config.funcs assignment should probably be done in
 204          * cirrus_modeset_init() (that's a common pattern seen in other DRM
 205          * drivers).
 206          */
 207         dev->mode_config.funcs = &cirrus_mode_funcs;
 208         r = cirrus_modeset_init(cdev);
 209         if (r) {
 210                 dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
 211                 goto out;
 212         }
 213
 214         return 0;
 215 out:
 216         cirrus_driver_unload(dev);
 217         return r;
 218 }
 219
 220 void cirrus_driver_unload(struct drm_device *dev)
 221 {
 222         struct cirrus_device *cdev = dev->dev_private;
 223
 224         if (cdev == NULL)
 225                 return;
 226         cirrus_modeset_fini(cdev);
 227         cirrus_mm_fini(cdev);
 228         cirrus_device_fini(cdev);
 229         kfree(cdev);
 230         dev->dev_private = NULL;
 231 }
 232
 233 int cirrus_gem_create(struct drm_device *dev,
 234                    u32 size, bool iskernel,
 235                    struct drm_gem_object **obj)
 236 {
 237         struct cirrus_bo *cirrusbo;
 238         int ret;
 239
 240         *obj = NULL;
 241
 242         size = roundup(size, PAGE_SIZE);
 243         if (size == 0)
 244                 return -EINVAL;
 245
 246         ret = cirrus_bo_create(dev, size, 0, 0, &cirrusbo);
 247         if (ret) {
 248                 if (ret != -ERESTARTSYS)
 249                         DRM_ERROR("failed to allocate GEM object\n");
 250                 return ret;
 251         }
 252         *obj = &cirrusbo->gem;
 253         return 0;
 254 }
 255
 256 int cirrus_dumb_create(struct drm_file *file,
 257                     struct drm_device *dev,
 258                     struct drm_mode_create_dumb *args)
 259 {
 260         int ret;
 261         struct drm_gem_object *gobj;
 262         u32 handle;
 263
 264         args->pitch = args->width * ((args->bpp + 7) / 8);
 265         args->size = args->pitch * args->height;
 266
 267         ret = cirrus_gem_create(dev, args->size, false,
 268                              &gobj);
 269         if (ret)
 270                 return ret;
 271
 272         ret = drm_gem_handle_create(file, gobj, &handle);
 273         drm_gem_object_put_unlocked(gobj);
 274         if (ret)
 275                 return ret;
 276
 277         args->handle = handle;
 278         return 0;
 279 }
 280
 281 static void cirrus_bo_unref(struct cirrus_bo **bo)
 282 {
 283         struct ttm_buffer_object *tbo;
 284
 285         if ((*bo) == NULL)
 286                 return;
 287
 288         tbo = &((*bo)->bo);
 289         ttm_bo_unref(&tbo);
 290         *bo = NULL;
 291 }
 292
 293 void cirrus_gem_free_object(struct drm_gem_object *obj)
 294 {
 295         struct cirrus_bo *cirrus_bo = gem_to_cirrus_bo(obj);
 296
 297         cirrus_bo_unref(&cirrus_bo);
 298 }
 299
 300
 301 static inline u64 cirrus_bo_mmap_offset(struct cirrus_bo *bo)
 302 {
 303         return drm_vma_node_offset_addr(&bo->bo.vma_node);
 304 }
 305
 306 int
 307 cirrus_dumb_mmap_offset(struct drm_file *file,
 308                      struct drm_device *dev,
 309                      uint32_t handle,
 310                      uint64_t *offset)
 311 {
 312         struct drm_gem_object *obj;
 313         struct cirrus_bo *bo;
 314
 315         obj = drm_gem_object_lookup(file, handle);
 316         if (obj == NULL)
 317                 return -ENOENT;
 318
 319         bo = gem_to_cirrus_bo(obj);
 320         *offset = cirrus_bo_mmap_offset(bo);
 321
 322         drm_gem_object_put_unlocked(obj);
 323
 324         return 0;
 325 }
 326
 327 bool cirrus_check_framebuffer(struct cirrus_device *cdev, int width, int height,
 328                               int bpp, int pitch)
 329 {
 330         const int max_pitch = 0x1FF << 3; /* (4096 - 1) & ~111b bytes */
 331         const int max_size = cdev->mc.vram_size;
 332
 333         if (bpp > cirrus_bpp)
 334                 return false;
 335         if (bpp > 32)
 336                 return false;
 337
 338         if (pitch > max_pitch)
 339                 return false;
 340
 341         if (pitch * height > max_size)
 342                 return false;
 343
 344         return true;
 345 }