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