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