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_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP); 65 66 if (dmah->vaddr == NULL) { 67 kfree(dmah); 68 return NULL; 69 } 70 71 memset(dmah->vaddr, 0, size); 72 73 /* XXX - Is virt_to_page() legal for consistent mem? */ 74 /* Reserve */ 75 for (addr = (unsigned long)dmah->vaddr, sz = size; 76 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 77 SetPageReserved(virt_to_page((void *)addr)); 78 } 79 80 return dmah; 81 } 82 83 EXPORT_SYMBOL(drm_pci_alloc); 84 85 /* 86 * Free a PCI consistent memory block without freeing its descriptor. 87 * 88 * This function is for internal use in the Linux-specific DRM core code. 89 */ 90 void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 91 { 92 unsigned long addr; 93 size_t sz; 94 95 if (dmah->vaddr) { 96 /* XXX - Is virt_to_page() legal for consistent mem? */ 97 /* Unreserve */ 98 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; 99 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 100 ClearPageReserved(virt_to_page((void *)addr)); 101 } 102 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, 103 dmah->busaddr); 104 } 105 } 106 107 /** 108 * drm_pci_free - Free a PCI consistent memory block 109 * @dev: DRM device 110 * @dmah: handle to memory block 111 * 112 * FIXME: This is a needless abstraction of the Linux dma-api and should be 113 * removed. 114 */ 115 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 116 { 117 __drm_legacy_pci_free(dev, dmah); 118 kfree(dmah); 119 } 120 121 EXPORT_SYMBOL(drm_pci_free); 122 123 #ifdef CONFIG_PCI 124 125 static int drm_get_pci_domain(struct drm_device *dev) 126 { 127 #ifndef __alpha__ 128 /* For historical reasons, drm_get_pci_domain() is busticated 129 * on most archs and has to remain so for userspace interface 130 * < 1.4, except on alpha which was right from the beginning 131 */ 132 if (dev->if_version < 0x10004) 133 return 0; 134 #endif /* __alpha__ */ 135 136 return pci_domain_nr(dev->pdev->bus); 137 } 138 139 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 140 { 141 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d", 142 drm_get_pci_domain(dev), 143 dev->pdev->bus->number, 144 PCI_SLOT(dev->pdev->devfn), 145 PCI_FUNC(dev->pdev->devfn)); 146 if (!master->unique) 147 return -ENOMEM; 148 149 master->unique_len = strlen(master->unique); 150 return 0; 151 } 152 153 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p) 154 { 155 if ((p->busnum >> 8) != drm_get_pci_domain(dev) || 156 (p->busnum & 0xff) != dev->pdev->bus->number || 157 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) 158 return -EINVAL; 159 160 p->irq = dev->pdev->irq; 161 162 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, 163 p->irq); 164 return 0; 165 } 166 167 /** 168 * drm_irq_by_busid - Get interrupt from bus ID 169 * @dev: DRM device 170 * @data: IOCTL parameter pointing to a drm_irq_busid structure 171 * @file_priv: DRM file private. 172 * 173 * Finds the PCI device with the specified bus id and gets its IRQ number. 174 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal 175 * to that of the device that this DRM instance attached to. 176 * 177 * Return: 0 on success or a negative error code on failure. 178 */ 179 int drm_irq_by_busid(struct drm_device *dev, void *data, 180 struct drm_file *file_priv) 181 { 182 struct drm_irq_busid *p = data; 183 184 if (!drm_core_check_feature(dev, DRIVER_LEGACY)) 185 return -EINVAL; 186 187 /* UMS was only ever support on PCI devices. */ 188 if (WARN_ON(!dev->pdev)) 189 return -EINVAL; 190 191 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) 192 return -EINVAL; 193 194 return drm_pci_irq_by_busid(dev, p); 195 } 196 197 static void drm_pci_agp_init(struct drm_device *dev) 198 { 199 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { 200 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP)) 201 dev->agp = drm_agp_init(dev); 202 if (dev->agp) { 203 dev->agp->agp_mtrr = arch_phys_wc_add( 204 dev->agp->agp_info.aper_base, 205 dev->agp->agp_info.aper_size * 206 1024 * 1024); 207 } 208 } 209 } 210 211 void drm_pci_agp_destroy(struct drm_device *dev) 212 { 213 if (dev->agp) { 214 arch_phys_wc_del(dev->agp->agp_mtrr); 215 drm_legacy_agp_clear(dev); 216 kfree(dev->agp); 217 dev->agp = NULL; 218 } 219 } 220 221 /** 222 * drm_get_pci_dev - Register a PCI device with the DRM subsystem 223 * @pdev: PCI device 224 * @ent: entry from the PCI ID table that matches @pdev 225 * @driver: DRM device driver 226 * 227 * Attempt to gets inter module "drm" information. If we are first 228 * then register the character device and inter module information. 229 * Try and register, if we fail to register, backout previous work. 230 * 231 * NOTE: This function is deprecated, please use drm_dev_alloc() and 232 * drm_dev_register() instead and remove your &drm_driver.load callback. 233 * 234 * Return: 0 on success or a negative error code on failure. 235 */ 236 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent, 237 struct drm_driver *driver) 238 { 239 struct drm_device *dev; 240 int ret; 241 242 DRM_DEBUG("\n"); 243 244 dev = drm_dev_alloc(driver, &pdev->dev); 245 if (IS_ERR(dev)) 246 return PTR_ERR(dev); 247 248 ret = pci_enable_device(pdev); 249 if (ret) 250 goto err_free; 251 252 dev->pdev = pdev; 253 #ifdef __alpha__ 254 dev->hose = pdev->sysdata; 255 #endif 256 257 if (drm_core_check_feature(dev, DRIVER_MODESET)) 258 pci_set_drvdata(pdev, dev); 259 260 drm_pci_agp_init(dev); 261 262 ret = drm_dev_register(dev, ent->driver_data); 263 if (ret) 264 goto err_agp; 265 266 /* No locking needed since shadow-attach is single-threaded since it may 267 * only be called from the per-driver module init hook. */ 268 if (drm_core_check_feature(dev, DRIVER_LEGACY)) 269 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list); 270 271 return 0; 272 273 err_agp: 274 drm_pci_agp_destroy(dev); 275 pci_disable_device(pdev); 276 err_free: 277 drm_dev_put(dev); 278 return ret; 279 } 280 EXPORT_SYMBOL(drm_get_pci_dev); 281 282 /** 283 * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver 284 * @driver: DRM device driver 285 * @pdriver: PCI device driver 286 * 287 * This is only used by legacy dri1 drivers and deprecated. 288 * 289 * Return: 0 on success or a negative error code on failure. 290 */ 291 int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 292 { 293 struct pci_dev *pdev = NULL; 294 const struct pci_device_id *pid; 295 int i; 296 297 DRM_DEBUG("\n"); 298 299 if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY))) 300 return -EINVAL; 301 302 /* If not using KMS, fall back to stealth mode manual scanning. */ 303 INIT_LIST_HEAD(&driver->legacy_dev_list); 304 for (i = 0; pdriver->id_table[i].vendor != 0; i++) { 305 pid = &pdriver->id_table[i]; 306 307 /* Loop around setting up a DRM device for each PCI device 308 * matching our ID and device class. If we had the internal 309 * function that pci_get_subsys and pci_get_class used, we'd 310 * be able to just pass pid in instead of doing a two-stage 311 * thing. 312 */ 313 pdev = NULL; 314 while ((pdev = 315 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 316 pid->subdevice, pdev)) != NULL) { 317 if ((pdev->class & pid->class_mask) != pid->class) 318 continue; 319 320 /* stealth mode requires a manual probe */ 321 pci_dev_get(pdev); 322 drm_get_pci_dev(pdev, pid, driver); 323 } 324 } 325 return 0; 326 } 327 EXPORT_SYMBOL(drm_legacy_pci_init); 328 329 #else 330 331 void drm_pci_agp_destroy(struct drm_device *dev) {} 332 333 int drm_irq_by_busid(struct drm_device *dev, void *data, 334 struct drm_file *file_priv) 335 { 336 return -EINVAL; 337 } 338 #endif 339 340 /** 341 * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver 342 * @driver: DRM device driver 343 * @pdriver: PCI device driver 344 * 345 * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This 346 * is deprecated and only used by dri1 drivers. 347 */ 348 void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) 349 { 350 struct drm_device *dev, *tmp; 351 DRM_DEBUG("\n"); 352 353 if (!(driver->driver_features & DRIVER_LEGACY)) { 354 WARN_ON(1); 355 } else { 356 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list, 357 legacy_dev_list) { 358 list_del(&dev->legacy_dev_list); 359 drm_put_dev(dev); 360 } 361 } 362 DRM_INFO("Module unloaded\n"); 363 } 364 EXPORT_SYMBOL(drm_legacy_pci_exit); 365