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 55 /* pci_alloc_consistent only guarantees alignment to the smallest 56 * PAGE_SIZE order which is greater than or equal to the requested size. 57 * Return NULL here for now to make sure nobody tries for larger alignment 58 */ 59 if (align > size) 60 return NULL; 61 62 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); 63 if (!dmah) 64 return NULL; 65 66 dmah->size = size; 67 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, 68 &dmah->busaddr, 69 GFP_KERNEL); 70 71 if (dmah->vaddr == NULL) { 72 kfree(dmah); 73 return NULL; 74 } 75 76 return dmah; 77 } 78 79 EXPORT_SYMBOL(drm_pci_alloc); 80 81 /** 82 * drm_pci_free - Free a PCI consistent memory block 83 * @dev: DRM device 84 * @dmah: handle to memory block 85 * 86 * FIXME: This is a needless abstraction of the Linux dma-api and should be 87 * removed. 88 */ 89 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 90 { 91 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, 92 dmah->busaddr); 93 kfree(dmah); 94 } 95 96 EXPORT_SYMBOL(drm_pci_free); 97 98 static int drm_get_pci_domain(struct drm_device *dev) 99 { 100 #ifndef __alpha__ 101 /* For historical reasons, drm_get_pci_domain() is busticated 102 * on most archs and has to remain so for userspace interface 103 * < 1.4, except on alpha which was right from the beginning 104 */ 105 if (dev->if_version < 0x10004) 106 return 0; 107 #endif /* __alpha__ */ 108 109 return pci_domain_nr(dev->pdev->bus); 110 } 111 112 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 113 { 114 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d", 115 drm_get_pci_domain(dev), 116 dev->pdev->bus->number, 117 PCI_SLOT(dev->pdev->devfn), 118 PCI_FUNC(dev->pdev->devfn)); 119 if (!master->unique) 120 return -ENOMEM; 121 122 master->unique_len = strlen(master->unique); 123 return 0; 124 } 125 126 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p) 127 { 128 if ((p->busnum >> 8) != drm_get_pci_domain(dev) || 129 (p->busnum & 0xff) != dev->pdev->bus->number || 130 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) 131 return -EINVAL; 132 133 p->irq = dev->pdev->irq; 134 135 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, 136 p->irq); 137 return 0; 138 } 139 140 /** 141 * drm_irq_by_busid - Get interrupt from bus ID 142 * @dev: DRM device 143 * @data: IOCTL parameter pointing to a drm_irq_busid structure 144 * @file_priv: DRM file private. 145 * 146 * Finds the PCI device with the specified bus id and gets its IRQ number. 147 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal 148 * to that of the device that this DRM instance attached to. 149 * 150 * Return: 0 on success or a negative error code on failure. 151 */ 152 int drm_irq_by_busid(struct drm_device *dev, void *data, 153 struct drm_file *file_priv) 154 { 155 struct drm_irq_busid *p = data; 156 157 if (!drm_core_check_feature(dev, DRIVER_LEGACY)) 158 return -EOPNOTSUPP; 159 160 /* UMS was only ever support on PCI devices. */ 161 if (WARN_ON(!dev->pdev)) 162 return -EINVAL; 163 164 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) 165 return -EOPNOTSUPP; 166 167 return drm_pci_irq_by_busid(dev, p); 168 } 169 170 static void drm_pci_agp_init(struct drm_device *dev) 171 { 172 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { 173 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP)) 174 dev->agp = drm_agp_init(dev); 175 if (dev->agp) { 176 dev->agp->agp_mtrr = arch_phys_wc_add( 177 dev->agp->agp_info.aper_base, 178 dev->agp->agp_info.aper_size * 179 1024 * 1024); 180 } 181 } 182 } 183 184 void drm_pci_agp_destroy(struct drm_device *dev) 185 { 186 if (dev->agp) { 187 arch_phys_wc_del(dev->agp->agp_mtrr); 188 drm_legacy_agp_clear(dev); 189 kfree(dev->agp); 190 dev->agp = NULL; 191 } 192 } 193 194 /** 195 * drm_get_pci_dev - Register a PCI device with the DRM subsystem 196 * @pdev: PCI device 197 * @ent: entry from the PCI ID table that matches @pdev 198 * @driver: DRM device driver 199 * 200 * Attempt to gets inter module "drm" information. If we are first 201 * then register the character device and inter module information. 202 * Try and register, if we fail to register, backout previous work. 203 * 204 * NOTE: This function is deprecated, please use drm_dev_alloc() and 205 * drm_dev_register() instead and remove your &drm_driver.load callback. 206 * 207 * Return: 0 on success or a negative error code on failure. 208 */ 209 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent, 210 struct drm_driver *driver) 211 { 212 struct drm_device *dev; 213 int ret; 214 215 DRM_DEBUG("\n"); 216 217 dev = drm_dev_alloc(driver, &pdev->dev); 218 if (IS_ERR(dev)) 219 return PTR_ERR(dev); 220 221 ret = pci_enable_device(pdev); 222 if (ret) 223 goto err_free; 224 225 dev->pdev = pdev; 226 #ifdef __alpha__ 227 dev->hose = pdev->sysdata; 228 #endif 229 230 if (drm_core_check_feature(dev, DRIVER_MODESET)) 231 pci_set_drvdata(pdev, dev); 232 233 drm_pci_agp_init(dev); 234 235 ret = drm_dev_register(dev, ent->driver_data); 236 if (ret) 237 goto err_agp; 238 239 /* No locking needed since shadow-attach is single-threaded since it may 240 * only be called from the per-driver module init hook. */ 241 if (drm_core_check_feature(dev, DRIVER_LEGACY)) 242 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list); 243 244 return 0; 245 246 err_agp: 247 drm_pci_agp_destroy(dev); 248 pci_disable_device(pdev); 249 err_free: 250 drm_dev_put(dev); 251 return ret; 252 } 253 EXPORT_SYMBOL(drm_get_pci_dev); 254 255 #ifdef CONFIG_DRM_LEGACY 256 257 /** 258 * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver 259 * @driver: DRM device driver 260 * @pdriver: PCI device driver 261 * 262 * This is only used by legacy dri1 drivers and deprecated. 263 * 264 * Return: 0 on success or a negative error code on failure. 265 */ 266 int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 267 { 268 struct pci_dev *pdev = NULL; 269 const struct pci_device_id *pid; 270 int i; 271 272 DRM_DEBUG("\n"); 273 274 if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY))) 275 return -EINVAL; 276 277 /* If not using KMS, fall back to stealth mode manual scanning. */ 278 INIT_LIST_HEAD(&driver->legacy_dev_list); 279 for (i = 0; pdriver->id_table[i].vendor != 0; i++) { 280 pid = &pdriver->id_table[i]; 281 282 /* Loop around setting up a DRM device for each PCI device 283 * matching our ID and device class. If we had the internal 284 * function that pci_get_subsys and pci_get_class used, we'd 285 * be able to just pass pid in instead of doing a two-stage 286 * thing. 287 */ 288 pdev = NULL; 289 while ((pdev = 290 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 291 pid->subdevice, pdev)) != NULL) { 292 if ((pdev->class & pid->class_mask) != pid->class) 293 continue; 294 295 /* stealth mode requires a manual probe */ 296 pci_dev_get(pdev); 297 drm_get_pci_dev(pdev, pid, driver); 298 } 299 } 300 return 0; 301 } 302 EXPORT_SYMBOL(drm_legacy_pci_init); 303 304 /** 305 * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver 306 * @driver: DRM device driver 307 * @pdriver: PCI device driver 308 * 309 * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This 310 * is deprecated and only used by dri1 drivers. 311 */ 312 void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) 313 { 314 struct drm_device *dev, *tmp; 315 DRM_DEBUG("\n"); 316 317 if (!(driver->driver_features & DRIVER_LEGACY)) { 318 WARN_ON(1); 319 } else { 320 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list, 321 legacy_dev_list) { 322 list_del(&dev->legacy_dev_list); 323 drm_put_dev(dev); 324 } 325 } 326 DRM_INFO("Module unloaded\n"); 327 } 328 EXPORT_SYMBOL(drm_legacy_pci_exit); 329 330 #endif 331