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         if (cirrus_fb->obj)
  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                             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                                struct drm_mode_fb_cmd2 *mode_cmd)
  51 {
  52         struct drm_gem_object *obj;
  53         struct cirrus_framebuffer *cirrus_fb;
  54         int ret;
  55         u32 bpp, depth;
  56
  57         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
  58         /* cirrus can't handle > 24bpp framebuffers at all */
  59         if (bpp > 24)
  60                 return ERR_PTR(-EINVAL);
  61
  62         obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
  63         if (obj == NULL)
  64                 return ERR_PTR(-ENOENT);
  65
  66         cirrus_fb = kzalloc(sizeof(*cirrus_fb), GFP_KERNEL);
  67         if (!cirrus_fb) {
  68                 drm_gem_object_unreference_unlocked(obj);
  69                 return ERR_PTR(-ENOMEM);
  70         }
  71
  72         ret = cirrus_framebuffer_init(dev, cirrus_fb, mode_cmd, obj);
  73         if (ret) {
  74                 drm_gem_object_unreference_unlocked(obj);
  75                 kfree(cirrus_fb);
  76                 return ERR_PTR(ret);
  77         }
  78         return &cirrus_fb->base;
  79 }
  80
  81 static const struct drm_mode_config_funcs cirrus_mode_funcs = {
  82         .fb_create = cirrus_user_framebuffer_create,
  83 };
  84
  85 /* Unmap the framebuffer from the core and release the memory */
  86 static void cirrus_vram_fini(struct cirrus_device *cdev)
  87 {
  88         iounmap(cdev->rmmio);
  89         cdev->rmmio = NULL;
  90         if (cdev->mc.vram_base)
  91                 release_mem_region(cdev->mc.vram_base, cdev->mc.vram_size);
  92 }
  93
  94 /* Map the framebuffer from the card and configure the core */
  95 static int cirrus_vram_init(struct cirrus_device *cdev)
  96 {
  97         /* BAR 0 is VRAM */
  98         cdev->mc.vram_base = pci_resource_start(cdev->dev->pdev, 0);
  99         /* We have 4MB of VRAM */
 100         cdev->mc.vram_size = 4 * 1024 * 1024;
 101
 102         if (!request_mem_region(cdev->mc.vram_base, cdev->mc.vram_size,
 103                                 "cirrusdrmfb_vram")) {
 104                 DRM_ERROR("can't reserve VRAM\n");
 105                 return -ENXIO;
 106         }
 107
 108         return 0;
 109 }
 110
 111 /*
 112  * Our emulated hardware has two sets of memory. One is video RAM and can
 113  * simply be used as a linear framebuffer - the other provides mmio access
 114  * to the display registers. The latter can also be accessed via IO port
 115  * access, but we map the range and use mmio to program them instead
 116  */
 117
 118 int cirrus_device_init(struct cirrus_device *cdev,
 119                        struct drm_device *ddev,
 120                        struct pci_dev *pdev, uint32_t flags)
 121 {
 122         int ret;
 123
 124         cdev->dev = ddev;
 125         cdev->flags = flags;
 126
 127         /* Hardcode the number of CRTCs to 1 */
 128         cdev->num_crtc = 1;
 129
 130         /* BAR 0 is the framebuffer, BAR 1 contains registers */
 131         cdev->rmmio_base = pci_resource_start(cdev->dev->pdev, 1);
 132         cdev->rmmio_size = pci_resource_len(cdev->dev->pdev, 1);
 133
 134         if (!request_mem_region(cdev->rmmio_base, cdev->rmmio_size,
 135                                 "cirrusdrmfb_mmio")) {
 136                 DRM_ERROR("can't reserve mmio registers\n");
 137                 return -ENOMEM;
 138         }
 139
 140         cdev->rmmio = ioremap(cdev->rmmio_base, cdev->rmmio_size);
 141
 142         if (cdev->rmmio == NULL)
 143                 return -ENOMEM;
 144
 145         ret = cirrus_vram_init(cdev);
 146         if (ret) {
 147                 release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
 148                 return ret;
 149         }
 150
 151         return 0;
 152 }
 153
 154 void cirrus_device_fini(struct cirrus_device *cdev)
 155 {
 156         release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
 157         cirrus_vram_fini(cdev);
 158 }
 159
 160 /*
 161  * Functions here will be called by the core once it's bound the driver to
 162  * a PCI device
 163  */
 164
 165 int cirrus_driver_load(struct drm_device *dev, unsigned long flags)
 166 {
 167         struct cirrus_device *cdev;
 168         int r;
 169
 170         cdev = kzalloc(sizeof(struct cirrus_device), GFP_KERNEL);
 171         if (cdev == NULL)
 172                 return -ENOMEM;
 173         dev->dev_private = (void *)cdev;
 174
 175         r = cirrus_device_init(cdev, dev, dev->pdev, flags);
 176         if (r) {
 177                 dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
 178                 goto out;
 179         }
 180
 181         r = cirrus_mm_init(cdev);
 182         if (r)
 183                 dev_err(&dev->pdev->dev, "fatal err on mm init\n");
 184
 185         r = cirrus_modeset_init(cdev);
 186         if (r)
 187                 dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
 188
 189         dev->mode_config.funcs = (void *)&cirrus_mode_funcs;
 190 out:
 191         if (r)
 192                 cirrus_driver_unload(dev);
 193         return r;
 194 }
 195
 196 int cirrus_driver_unload(struct drm_device *dev)
 197 {
 198         struct cirrus_device *cdev = dev->dev_private;
 199
 200         if (cdev == NULL)
 201                 return 0;
 202         cirrus_modeset_fini(cdev);
 203         cirrus_mm_fini(cdev);
 204         cirrus_device_fini(cdev);
 205         kfree(cdev);
 206         dev->dev_private = NULL;
 207         return 0;
 208 }
 209
 210 int cirrus_gem_create(struct drm_device *dev,
 211                    u32 size, bool iskernel,
 212                    struct drm_gem_object **obj)
 213 {
 214         struct cirrus_bo *cirrusbo;
 215         int ret;
 216
 217         *obj = NULL;
 218
 219         size = roundup(size, PAGE_SIZE);
 220         if (size == 0)
 221                 return -EINVAL;
 222
 223         ret = cirrus_bo_create(dev, size, 0, 0, &cirrusbo);
 224         if (ret) {
 225                 if (ret != -ERESTARTSYS)
 226                         DRM_ERROR("failed to allocate GEM object\n");
 227                 return ret;
 228         }
 229         *obj = &cirrusbo->gem;
 230         return 0;
 231 }
 232
 233 int cirrus_dumb_create(struct drm_file *file,
 234                     struct drm_device *dev,
 235                     struct drm_mode_create_dumb *args)
 236 {
 237         int ret;
 238         struct drm_gem_object *gobj;
 239         u32 handle;
 240
 241         args->pitch = args->width * ((args->bpp + 7) / 8);
 242         args->size = args->pitch * args->height;
 243
 244         ret = cirrus_gem_create(dev, args->size, false,
 245                              &gobj);
 246         if (ret)
 247                 return ret;
 248
 249         ret = drm_gem_handle_create(file, gobj, &handle);
 250         drm_gem_object_unreference_unlocked(gobj);
 251         if (ret)
 252                 return ret;
 253
 254         args->handle = handle;
 255         return 0;
 256 }
 257
 258 int cirrus_gem_init_object(struct drm_gem_object *obj)
 259 {
 260         BUG();
 261         return 0;
 262 }
 263
 264 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         if (tbo == NULL)
 274                 *bo = NULL;
 275
 276 }
 277
 278 void cirrus_gem_free_object(struct drm_gem_object *obj)
 279 {
 280         struct cirrus_bo *cirrus_bo = gem_to_cirrus_bo(obj);
 281
 282         if (!cirrus_bo)
 283                 return;
 284         cirrus_bo_unref(&cirrus_bo);
 285 }
 286
 287
 288 static inline u64 cirrus_bo_mmap_offset(struct cirrus_bo *bo)
 289 {
 290         return drm_vma_node_offset_addr(&bo->bo.vma_node);
 291 }
 292
 293 int
 294 cirrus_dumb_mmap_offset(struct drm_file *file,
 295                      struct drm_device *dev,
 296                      uint32_t handle,
 297                      uint64_t *offset)
 298 {
 299         struct drm_gem_object *obj;
 300         int ret;
 301         struct cirrus_bo *bo;
 302
 303         mutex_lock(&dev->struct_mutex);
 304         obj = drm_gem_object_lookup(dev, file, handle);
 305         if (obj == NULL) {
 306                 ret = -ENOENT;
 307                 goto out_unlock;
 308         }
 309
 310         bo = gem_to_cirrus_bo(obj);
 311         *offset = cirrus_bo_mmap_offset(bo);
 312
 313         drm_gem_object_unreference(obj);
 314         ret = 0;
 315 out_unlock:
 316         mutex_unlock(&dev->struct_mutex);
 317         return ret;
 318
 319 }