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_print.h> 34 35 #include "drm_internal.h" 36 #include "drm_legacy.h" 37 38 #ifdef CONFIG_DRM_LEGACY 39 40 #ifdef __linux__ 41 42 /** 43 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA. 44 * @dev: DRM device 45 * @size: size of block to allocate 46 * @align: alignment of block 47 * 48 * FIXME: This is a needless abstraction of the Linux dma-api and should be 49 * removed. 50 * 51 * Return: A handle to the allocated memory block on success or NULL on 52 * failure. 53 */ 54 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) 55 { 56 drm_dma_handle_t *dmah; 57 58 /* pci_alloc_consistent only guarantees alignment to the smallest 59 * PAGE_SIZE order which is greater than or equal to the requested size. 60 * Return NULL here for now to make sure nobody tries for larger alignment 61 */ 62 if (align > size) 63 return NULL; 64 65 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); 66 if (!dmah) 67 return NULL; 68 69 dmah->size = size; 70 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, 71 &dmah->busaddr, 72 GFP_KERNEL); 73 74 if (dmah->vaddr == NULL) { 75 kfree(dmah); 76 return NULL; 77 } 78 79 return dmah; 80 } 81 EXPORT_SYMBOL(drm_pci_alloc); 82 83 /** 84 * drm_pci_free - Free a PCI consistent memory block 85 * @dev: DRM device 86 * @dmah: handle to memory block 87 * 88 * FIXME: This is a needless abstraction of the Linux dma-api and should be 89 * removed. 90 */ 91 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 92 { 93 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, 94 dmah->busaddr); 95 kfree(dmah); 96 } 97 98 EXPORT_SYMBOL(drm_pci_free); 99 #endif 100 101 #endif /* __linux__ */ 102 103 static int drm_get_pci_domain(struct drm_device *dev) 104 { 105 #ifndef __alpha__ 106 /* For historical reasons, drm_get_pci_domain() is busticated 107 * on most archs and has to remain so for userspace interface 108 * < 1.4, except on alpha which was right from the beginning 109 */ 110 if (dev->if_version < 0x10004) 111 return 0; 112 #endif /* __alpha__ */ 113 114 return pci_domain_nr(dev->pdev->bus); 115 } 116 117 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 118 { 119 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d", 120 drm_get_pci_domain(dev), 121 dev->pdev->bus->number, 122 PCI_SLOT(dev->pdev->devfn), 123 PCI_FUNC(dev->pdev->devfn)); 124 if (!master->unique) 125 return -ENOMEM; 126 127 master->unique_len = strlen(master->unique); 128 return 0; 129 } 130 131 #ifdef __linux__ 132 133 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p) 134 { 135 if ((p->busnum >> 8) != drm_get_pci_domain(dev) || 136 (p->busnum & 0xff) != dev->pdev->bus->number || 137 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) 138 return -EINVAL; 139 140 p->irq = dev->pdev->irq; 141 142 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, 143 p->irq); 144 return 0; 145 } 146 147 /** 148 * drm_irq_by_busid - Get interrupt from bus ID 149 * @dev: DRM device 150 * @data: IOCTL parameter pointing to a drm_irq_busid structure 151 * @file_priv: DRM file private. 152 * 153 * Finds the PCI device with the specified bus id and gets its IRQ number. 154 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal 155 * to that of the device that this DRM instance attached to. 156 * 157 * Return: 0 on success or a negative error code on failure. 158 */ 159 int drm_irq_by_busid(struct drm_device *dev, void *data, 160 struct drm_file *file_priv) 161 { 162 struct drm_irq_busid *p = data; 163 164 if (!drm_core_check_feature(dev, DRIVER_LEGACY)) 165 return -EOPNOTSUPP; 166 167 /* UMS was only ever support on PCI devices. */ 168 if (WARN_ON(!dev->pdev)) 169 return -EINVAL; 170 171 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) 172 return -EOPNOTSUPP; 173 174 return drm_pci_irq_by_busid(dev, p); 175 } 176 177 void drm_pci_agp_destroy(struct drm_device *dev) 178 { 179 if (dev->agp) { 180 arch_phys_wc_del(dev->agp->agp_mtrr); 181 drm_legacy_agp_clear(dev); 182 kfree(dev->agp); 183 dev->agp = NULL; 184 } 185 } 186 187 #ifdef CONFIG_DRM_LEGACY 188 189 static void drm_pci_agp_init(struct drm_device *dev) 190 { 191 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { 192 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP)) 193 dev->agp = drm_agp_init(dev); 194 if (dev->agp) { 195 dev->agp->agp_mtrr = arch_phys_wc_add( 196 dev->agp->agp_info.aper_base, 197 dev->agp->agp_info.aper_size * 198 1024 * 1024); 199 } 200 } 201 } 202 203 static int drm_get_pci_dev(struct pci_dev *pdev, 204 const struct pci_device_id *ent, 205 struct drm_driver *driver) 206 { 207 struct drm_device *dev; 208 int ret; 209 210 DRM_DEBUG("\n"); 211 212 dev = drm_dev_alloc(driver, &pdev->dev); 213 if (IS_ERR(dev)) 214 return PTR_ERR(dev); 215 216 ret = pci_enable_device(pdev); 217 if (ret) 218 goto err_free; 219 220 dev->pdev = pdev; 221 #ifdef __alpha__ 222 dev->hose = pdev->sysdata; 223 #endif 224 225 if (drm_core_check_feature(dev, DRIVER_MODESET)) 226 pci_set_drvdata(pdev, dev); 227 228 drm_pci_agp_init(dev); 229 230 ret = drm_dev_register(dev, ent->driver_data); 231 if (ret) 232 goto err_agp; 233 234 /* No locking needed since shadow-attach is single-threaded since it may 235 * only be called from the per-driver module init hook. */ 236 if (drm_core_check_feature(dev, DRIVER_LEGACY)) 237 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list); 238 239 return 0; 240 241 err_agp: 242 drm_pci_agp_destroy(dev); 243 pci_disable_device(pdev); 244 err_free: 245 drm_dev_put(dev); 246 return ret; 247 } 248 249 /** 250 * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver 251 * @driver: DRM device driver 252 * @pdriver: PCI device driver 253 * 254 * This is only used by legacy dri1 drivers and deprecated. 255 * 256 * Return: 0 on success or a negative error code on failure. 257 */ 258 int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 259 { 260 struct pci_dev *pdev = NULL; 261 const struct pci_device_id *pid; 262 int i; 263 264 DRM_DEBUG("\n"); 265 266 if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY))) 267 return -EINVAL; 268 269 /* If not using KMS, fall back to stealth mode manual scanning. */ 270 INIT_LIST_HEAD(&driver->legacy_dev_list); 271 for (i = 0; pdriver->id_table[i].vendor != 0; i++) { 272 pid = &pdriver->id_table[i]; 273 274 /* Loop around setting up a DRM device for each PCI device 275 * matching our ID and device class. If we had the internal 276 * function that pci_get_subsys and pci_get_class used, we'd 277 * be able to just pass pid in instead of doing a two-stage 278 * thing. 279 */ 280 pdev = NULL; 281 while ((pdev = 282 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 283 pid->subdevice, pdev)) != NULL) { 284 if ((pdev->class & pid->class_mask) != pid->class) 285 continue; 286 287 /* stealth mode requires a manual probe */ 288 pci_dev_get(pdev); 289 drm_get_pci_dev(pdev, pid, driver); 290 } 291 } 292 return 0; 293 } 294 EXPORT_SYMBOL(drm_legacy_pci_init); 295 296 /** 297 * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver 298 * @driver: DRM device driver 299 * @pdriver: PCI device driver 300 * 301 * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This 302 * is deprecated and only used by dri1 drivers. 303 */ 304 void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) 305 { 306 struct drm_device *dev, *tmp; 307 308 DRM_DEBUG("\n"); 309 310 if (!(driver->driver_features & DRIVER_LEGACY)) { 311 WARN_ON(1); 312 } else { 313 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list, 314 legacy_dev_list) { 315 list_del(&dev->legacy_dev_list); 316 drm_put_dev(dev); 317 } 318 } 319 DRM_INFO("Module unloaded\n"); 320 } 321 EXPORT_SYMBOL(drm_legacy_pci_exit); 322 323 #endif 324 325 #endif /* __linux__ */ 326