1 /* 2 * Copyright 2003 José Fonseca. 3 * Copyright 2003 Leif Delgass. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the next 14 * paragraph) shall be included in all copies or substantial portions of the 15 * Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 20 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 21 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23 */ 24 25 #include <linux/dma-mapping.h> 26 #include <linux/export.h> 27 #include <linux/pci.h> 28 #include <linux/slab.h> 29 30 #include <drm/drm.h> 31 #include <drm/drm_agpsupport.h> 32 #include <drm/drm_drv.h> 33 #include <drm/drm_pci.h> 34 #include <drm/drm_print.h> 35 36 #include "drm_internal.h" 37 #include "drm_legacy.h" 38 39 /** 40 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA. 41 * @dev: DRM device 42 * @size: size of block to allocate 43 * @align: alignment of block 44 * 45 * FIXME: This is a needless abstraction of the Linux dma-api and should be 46 * removed. 47 * 48 * Return: A handle to the allocated memory block on success or NULL on 49 * failure. 50 */ 51 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) 52 { 53 drm_dma_handle_t *dmah; 54 unsigned long addr; 55 size_t sz; 56 57 /* pci_alloc_consistent only guarantees alignment to the smallest 58 * PAGE_SIZE order which is greater than or equal to the requested size. 59 * Return NULL here for now to make sure nobody tries for larger alignment 60 */ 61 if (align > size) 62 return NULL; 63 64 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); 65 if (!dmah) 66 return NULL; 67 68 dmah->size = size; 69 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, 70 &dmah->busaddr, 71 GFP_KERNEL | __GFP_COMP); 72 73 if (dmah->vaddr == NULL) { 74 kfree(dmah); 75 return NULL; 76 } 77 78 /* XXX - Is virt_to_page() legal for consistent mem? */ 79 /* Reserve */ 80 for (addr = (unsigned long)dmah->vaddr, sz = size; 81 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 82 SetPageReserved(virt_to_page((void *)addr)); 83 } 84 85 return dmah; 86 } 87 88 EXPORT_SYMBOL(drm_pci_alloc); 89 90 /* 91 * Free a PCI consistent memory block without freeing its descriptor. 92 * 93 * This function is for internal use in the Linux-specific DRM core code. 94 */ 95 void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 96 { 97 unsigned long addr; 98 size_t sz; 99 100 if (dmah->vaddr) { 101 /* XXX - Is virt_to_page() legal for consistent mem? */ 102 /* Unreserve */ 103 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; 104 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 105 ClearPageReserved(virt_to_page((void *)addr)); 106 } 107 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, 108 dmah->busaddr); 109 } 110 } 111 112 /** 113 * drm_pci_free - Free a PCI consistent memory block 114 * @dev: DRM device 115 * @dmah: handle to memory block 116 * 117 * FIXME: This is a needless abstraction of the Linux dma-api and should be 118 * removed. 119 */ 120 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 121 { 122 __drm_legacy_pci_free(dev, dmah); 123 kfree(dmah); 124 } 125 126 EXPORT_SYMBOL(drm_pci_free); 127 128 #ifdef CONFIG_PCI 129 130 static int drm_get_pci_domain(struct drm_device *dev) 131 { 132 #ifndef __alpha__ 133 /* For historical reasons, drm_get_pci_domain() is busticated 134 * on most archs and has to remain so for userspace interface 135 * < 1.4, except on alpha which was right from the beginning 136 */ 137 if (dev->if_version < 0x10004) 138 return 0; 139 #endif /* __alpha__ */ 140 141 return pci_domain_nr(dev->pdev->bus); 142 } 143 144 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 145 { 146 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d", 147 drm_get_pci_domain(dev), 148 dev->pdev->bus->number, 149 PCI_SLOT(dev->pdev->devfn), 150 PCI_FUNC(dev->pdev->devfn)); 151 if (!master->unique) 152 return -ENOMEM; 153 154 master->unique_len = strlen(master->unique); 155 return 0; 156 } 157 158 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p) 159 { 160 if ((p->busnum >> 8) != drm_get_pci_domain(dev) || 161 (p->busnum & 0xff) != dev->pdev->bus->number || 162 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) 163 return -EINVAL; 164 165 p->irq = dev->pdev->irq; 166 167 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, 168 p->irq); 169 return 0; 170 } 171 172 /** 173 * drm_irq_by_busid - Get interrupt from bus ID 174 * @dev: DRM device 175 * @data: IOCTL parameter pointing to a drm_irq_busid structure 176 * @file_priv: DRM file private. 177 * 178 * Finds the PCI device with the specified bus id and gets its IRQ number. 179 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal 180 * to that of the device that this DRM instance attached to. 181 * 182 * Return: 0 on success or a negative error code on failure. 183 */ 184 int drm_irq_by_busid(struct drm_device *dev, void *data, 185 struct drm_file *file_priv) 186 { 187 struct drm_irq_busid *p = data; 188 189 if (!drm_core_check_feature(dev, DRIVER_LEGACY)) 190 return -EOPNOTSUPP; 191 192 /* UMS was only ever support on PCI devices. */ 193 if (WARN_ON(!dev->pdev)) 194 return -EINVAL; 195 196 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) 197 return -EOPNOTSUPP; 198 199 return drm_pci_irq_by_busid(dev, p); 200 } 201 202 static void drm_pci_agp_init(struct drm_device *dev) 203 { 204 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { 205 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP)) 206 dev->agp = drm_agp_init(dev); 207 if (dev->agp) { 208 dev->agp->agp_mtrr = arch_phys_wc_add( 209 dev->agp->agp_info.aper_base, 210 dev->agp->agp_info.aper_size * 211 1024 * 1024); 212 } 213 } 214 } 215 216 void drm_pci_agp_destroy(struct drm_device *dev) 217 { 218 if (dev->agp) { 219 arch_phys_wc_del(dev->agp->agp_mtrr); 220 drm_legacy_agp_clear(dev); 221 kfree(dev->agp); 222 dev->agp = NULL; 223 } 224 } 225 226 /** 227 * drm_get_pci_dev - Register a PCI device with the DRM subsystem 228 * @pdev: PCI device 229 * @ent: entry from the PCI ID table that matches @pdev 230 * @driver: DRM device driver 231 * 232 * Attempt to gets inter module "drm" information. If we are first 233 * then register the character device and inter module information. 234 * Try and register, if we fail to register, backout previous work. 235 * 236 * NOTE: This function is deprecated, please use drm_dev_alloc() and 237 * drm_dev_register() instead and remove your &drm_driver.load callback. 238 * 239 * Return: 0 on success or a negative error code on failure. 240 */ 241 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent, 242 struct drm_driver *driver) 243 { 244 struct drm_device *dev; 245 int ret; 246 247 DRM_DEBUG("\n"); 248 249 dev = drm_dev_alloc(driver, &pdev->dev); 250 if (IS_ERR(dev)) 251 return PTR_ERR(dev); 252 253 ret = pci_enable_device(pdev); 254 if (ret) 255 goto err_free; 256 257 dev->pdev = pdev; 258 #ifdef __alpha__ 259 dev->hose = pdev->sysdata; 260 #endif 261 262 if (drm_core_check_feature(dev, DRIVER_MODESET)) 263 pci_set_drvdata(pdev, dev); 264 265 drm_pci_agp_init(dev); 266 267 ret = drm_dev_register(dev, ent->driver_data); 268 if (ret) 269 goto err_agp; 270 271 /* No locking needed since shadow-attach is single-threaded since it may 272 * only be called from the per-driver module init hook. */ 273 if (drm_core_check_feature(dev, DRIVER_LEGACY)) 274 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list); 275 276 return 0; 277 278 err_agp: 279 drm_pci_agp_destroy(dev); 280 pci_disable_device(pdev); 281 err_free: 282 drm_dev_put(dev); 283 return ret; 284 } 285 EXPORT_SYMBOL(drm_get_pci_dev); 286 287 /** 288 * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver 289 * @driver: DRM device driver 290 * @pdriver: PCI device driver 291 * 292 * This is only used by legacy dri1 drivers and deprecated. 293 * 294 * Return: 0 on success or a negative error code on failure. 295 */ 296 int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 297 { 298 struct pci_dev *pdev = NULL; 299 const struct pci_device_id *pid; 300 int i; 301 302 DRM_DEBUG("\n"); 303 304 if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY))) 305 return -EINVAL; 306 307 /* If not using KMS, fall back to stealth mode manual scanning. */ 308 INIT_LIST_HEAD(&driver->legacy_dev_list); 309 for (i = 0; pdriver->id_table[i].vendor != 0; i++) { 310 pid = &pdriver->id_table[i]; 311 312 /* Loop around setting up a DRM device for each PCI device 313 * matching our ID and device class. If we had the internal 314 * function that pci_get_subsys and pci_get_class used, we'd 315 * be able to just pass pid in instead of doing a two-stage 316 * thing. 317 */ 318 pdev = NULL; 319 while ((pdev = 320 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 321 pid->subdevice, pdev)) != NULL) { 322 if ((pdev->class & pid->class_mask) != pid->class) 323 continue; 324 325 /* stealth mode requires a manual probe */ 326 pci_dev_get(pdev); 327 drm_get_pci_dev(pdev, pid, driver); 328 } 329 } 330 return 0; 331 } 332 EXPORT_SYMBOL(drm_legacy_pci_init); 333 334 #else 335 336 void drm_pci_agp_destroy(struct drm_device *dev) {} 337 338 int drm_irq_by_busid(struct drm_device *dev, void *data, 339 struct drm_file *file_priv) 340 { 341 return -EINVAL; 342 } 343 #endif 344 345 /** 346 * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver 347 * @driver: DRM device driver 348 * @pdriver: PCI device driver 349 * 350 * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This 351 * is deprecated and only used by dri1 drivers. 352 */ 353 void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) 354 { 355 struct drm_device *dev, *tmp; 356 DRM_DEBUG("\n"); 357 358 if (!(driver->driver_features & DRIVER_LEGACY)) { 359 WARN_ON(1); 360 } else { 361 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list, 362 legacy_dev_list) { 363 list_del(&dev->legacy_dev_list); 364 drm_put_dev(dev); 365 } 366 } 367 DRM_INFO("Module unloaded\n"); 368 } 369 EXPORT_SYMBOL(drm_legacy_pci_exit); 370