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 #ifdef __linux__ 40 41 /** 42 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA. 43 * @dev: DRM device 44 * @size: size of block to allocate 45 * @align: alignment of block 46 * 47 * FIXME: This is a needless abstraction of the Linux dma-api and should be 48 * removed. 49 * 50 * Return: A handle to the allocated memory block on success or NULL on 51 * failure. 52 */ 53 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) 54 { 55 drm_dma_handle_t *dmah; 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); 72 73 if (dmah->vaddr == NULL) { 74 kfree(dmah); 75 return NULL; 76 } 77 78 return dmah; 79 } 80 EXPORT_SYMBOL(drm_pci_alloc); 81 82 /** 83 * drm_pci_free - Free a PCI consistent memory block 84 * @dev: DRM device 85 * @dmah: handle to memory block 86 * 87 * FIXME: This is a needless abstraction of the Linux dma-api and should be 88 * removed. 89 */ 90 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 91 { 92 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, 93 dmah->busaddr); 94 kfree(dmah); 95 } 96 97 EXPORT_SYMBOL(drm_pci_free); 98 99 #endif /* __linux__ */ 100 101 static int drm_get_pci_domain(struct drm_device *dev) 102 { 103 #ifndef __alpha__ 104 /* For historical reasons, drm_get_pci_domain() is busticated 105 * on most archs and has to remain so for userspace interface 106 * < 1.4, except on alpha which was right from the beginning 107 */ 108 if (dev->if_version < 0x10004) 109 return 0; 110 #endif /* __alpha__ */ 111 112 return pci_domain_nr(dev->pdev->bus); 113 } 114 115 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 116 { 117 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d", 118 drm_get_pci_domain(dev), 119 dev->pdev->bus->number, 120 PCI_SLOT(dev->pdev->devfn), 121 PCI_FUNC(dev->pdev->devfn)); 122 if (!master->unique) 123 return -ENOMEM; 124 125 master->unique_len = strlen(master->unique); 126 return 0; 127 } 128 129 #ifdef __linux__ 130 131 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p) 132 { 133 if ((p->busnum >> 8) != drm_get_pci_domain(dev) || 134 (p->busnum & 0xff) != dev->pdev->bus->number || 135 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) 136 return -EINVAL; 137 138 p->irq = dev->pdev->irq; 139 140 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, 141 p->irq); 142 return 0; 143 } 144 145 /** 146 * drm_irq_by_busid - Get interrupt from bus ID 147 * @dev: DRM device 148 * @data: IOCTL parameter pointing to a drm_irq_busid structure 149 * @file_priv: DRM file private. 150 * 151 * Finds the PCI device with the specified bus id and gets its IRQ number. 152 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal 153 * to that of the device that this DRM instance attached to. 154 * 155 * Return: 0 on success or a negative error code on failure. 156 */ 157 int drm_irq_by_busid(struct drm_device *dev, void *data, 158 struct drm_file *file_priv) 159 { 160 struct drm_irq_busid *p = data; 161 162 if (!drm_core_check_feature(dev, DRIVER_LEGACY)) 163 return -EOPNOTSUPP; 164 165 /* UMS was only ever support on PCI devices. */ 166 if (WARN_ON(!dev->pdev)) 167 return -EINVAL; 168 169 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) 170 return -EOPNOTSUPP; 171 172 return drm_pci_irq_by_busid(dev, p); 173 } 174 175 void drm_pci_agp_destroy(struct drm_device *dev) 176 { 177 if (dev->agp) { 178 arch_phys_wc_del(dev->agp->agp_mtrr); 179 drm_legacy_agp_clear(dev); 180 kfree(dev->agp); 181 dev->agp = NULL; 182 } 183 } 184 185 #ifdef CONFIG_DRM_LEGACY 186 187 static void drm_pci_agp_init(struct drm_device *dev) 188 { 189 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { 190 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP)) 191 dev->agp = drm_agp_init(dev); 192 if (dev->agp) { 193 dev->agp->agp_mtrr = arch_phys_wc_add( 194 dev->agp->agp_info.aper_base, 195 dev->agp->agp_info.aper_size * 196 1024 * 1024); 197 } 198 } 199 } 200 201 static int drm_get_pci_dev(struct pci_dev *pdev, 202 const struct pci_device_id *ent, 203 struct drm_driver *driver) 204 { 205 struct drm_device *dev; 206 int ret; 207 208 DRM_DEBUG("\n"); 209 210 dev = drm_dev_alloc(driver, &pdev->dev); 211 if (IS_ERR(dev)) 212 return PTR_ERR(dev); 213 214 ret = pci_enable_device(pdev); 215 if (ret) 216 goto err_free; 217 218 dev->pdev = pdev; 219 #ifdef __alpha__ 220 dev->hose = pdev->sysdata; 221 #endif 222 223 if (drm_core_check_feature(dev, DRIVER_MODESET)) 224 pci_set_drvdata(pdev, dev); 225 226 drm_pci_agp_init(dev); 227 228 ret = drm_dev_register(dev, ent->driver_data); 229 if (ret) 230 goto err_agp; 231 232 /* No locking needed since shadow-attach is single-threaded since it may 233 * only be called from the per-driver module init hook. */ 234 if (drm_core_check_feature(dev, DRIVER_LEGACY)) 235 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list); 236 237 return 0; 238 239 err_agp: 240 drm_pci_agp_destroy(dev); 241 pci_disable_device(pdev); 242 err_free: 243 drm_dev_put(dev); 244 return ret; 245 } 246 247 /** 248 * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver 249 * @driver: DRM device driver 250 * @pdriver: PCI device driver 251 * 252 * This is only used by legacy dri1 drivers and deprecated. 253 * 254 * Return: 0 on success or a negative error code on failure. 255 */ 256 int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 257 { 258 struct pci_dev *pdev = NULL; 259 const struct pci_device_id *pid; 260 int i; 261 262 DRM_DEBUG("\n"); 263 264 if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY))) 265 return -EINVAL; 266 267 /* If not using KMS, fall back to stealth mode manual scanning. */ 268 INIT_LIST_HEAD(&driver->legacy_dev_list); 269 for (i = 0; pdriver->id_table[i].vendor != 0; i++) { 270 pid = &pdriver->id_table[i]; 271 272 /* Loop around setting up a DRM device for each PCI device 273 * matching our ID and device class. If we had the internal 274 * function that pci_get_subsys and pci_get_class used, we'd 275 * be able to just pass pid in instead of doing a two-stage 276 * thing. 277 */ 278 pdev = NULL; 279 while ((pdev = 280 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 281 pid->subdevice, pdev)) != NULL) { 282 if ((pdev->class & pid->class_mask) != pid->class) 283 continue; 284 285 /* stealth mode requires a manual probe */ 286 pci_dev_get(pdev); 287 drm_get_pci_dev(pdev, pid, driver); 288 } 289 } 290 return 0; 291 } 292 EXPORT_SYMBOL(drm_legacy_pci_init); 293 294 /** 295 * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver 296 * @driver: DRM device driver 297 * @pdriver: PCI device driver 298 * 299 * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This 300 * is deprecated and only used by dri1 drivers. 301 */ 302 void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) 303 { 304 struct drm_device *dev, *tmp; 305 DRM_DEBUG("\n"); 306 307 if (!(driver->driver_features & DRIVER_LEGACY)) { 308 WARN_ON(1); 309 } else { 310 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list, 311 legacy_dev_list) { 312 list_del(&dev->legacy_dev_list); 313 drm_put_dev(dev); 314 } 315 } 316 DRM_INFO("Module unloaded\n"); 317 } 318 EXPORT_SYMBOL(drm_legacy_pci_exit); 319 320 #endif 321 322 #endif /* __linux__ */ 323