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