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