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