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/list.h> 28 #include <linux/mutex.h> 29 #include <linux/pci.h> 30 #include <linux/slab.h> 31 32 #include <drm/drm.h> 33 #include <drm/drm_drv.h> 34 #include <drm/drm_print.h> 35 36 #include "drm_internal.h" 37 #include "drm_legacy.h" 38 39 #ifdef CONFIG_DRM_LEGACY 40 /* List of devices hanging off drivers with stealth attach. */ 41 static LIST_HEAD(legacy_dev_list); 42 static DEFINE_MUTEX(legacy_dev_list_lock); 43 #endif 44 45 static int drm_get_pci_domain(struct drm_device *dev) 46 { 47 #ifndef __alpha__ 48 /* For historical reasons, drm_get_pci_domain() is busticated 49 * on most archs and has to remain so for userspace interface 50 * < 1.4, except on alpha which was right from the beginning 51 */ 52 if (dev->if_version < 0x10004) 53 return 0; 54 #endif /* __alpha__ */ 55 56 #ifdef __linux__ 57 return pci_domain_nr(to_pci_dev(dev->dev)->bus); 58 #else 59 return pci_domain_nr(dev->pdev->bus); 60 #endif 61 } 62 63 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 64 { 65 #ifdef __linux__ 66 struct pci_dev *pdev = to_pci_dev(dev->dev); 67 #else 68 struct pci_dev *pdev = dev->pdev; 69 #endif 70 71 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d", 72 drm_get_pci_domain(dev), 73 pdev->bus->number, 74 PCI_SLOT(pdev->devfn), 75 PCI_FUNC(pdev->devfn)); 76 if (!master->unique) 77 return -ENOMEM; 78 79 master->unique_len = strlen(master->unique); 80 return 0; 81 } 82 83 #ifdef CONFIG_DRM_LEGACY 84 85 static int drm_legacy_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p) 86 { 87 struct pci_dev *pdev = to_pci_dev(dev->dev); 88 89 if ((p->busnum >> 8) != drm_get_pci_domain(dev) || 90 (p->busnum & 0xff) != pdev->bus->number || 91 p->devnum != PCI_SLOT(pdev->devfn) || p->funcnum != PCI_FUNC(pdev->devfn)) 92 return -EINVAL; 93 94 p->irq = pdev->irq; 95 96 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, 97 p->irq); 98 return 0; 99 } 100 101 /** 102 * drm_legacy_irq_by_busid - Get interrupt from bus ID 103 * @dev: DRM device 104 * @data: IOCTL parameter pointing to a drm_irq_busid structure 105 * @file_priv: DRM file private. 106 * 107 * Finds the PCI device with the specified bus id and gets its IRQ number. 108 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal 109 * to that of the device that this DRM instance attached to. 110 * 111 * Return: 0 on success or a negative error code on failure. 112 */ 113 int drm_legacy_irq_by_busid(struct drm_device *dev, void *data, 114 struct drm_file *file_priv) 115 { 116 struct drm_irq_busid *p = data; 117 118 if (!drm_core_check_feature(dev, DRIVER_LEGACY)) 119 return -EOPNOTSUPP; 120 121 /* UMS was only ever support on PCI devices. */ 122 if (WARN_ON(!dev_is_pci(dev->dev))) 123 return -EINVAL; 124 125 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) 126 return -EOPNOTSUPP; 127 128 return drm_legacy_pci_irq_by_busid(dev, p); 129 } 130 131 void drm_legacy_pci_agp_destroy(struct drm_device *dev) 132 { 133 if (dev->agp) { 134 arch_phys_wc_del(dev->agp->agp_mtrr); 135 drm_legacy_agp_clear(dev); 136 kfree(dev->agp); 137 dev->agp = NULL; 138 } 139 } 140 141 static void drm_legacy_pci_agp_init(struct drm_device *dev) 142 { 143 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { 144 if (pci_find_capability(to_pci_dev(dev->dev), PCI_CAP_ID_AGP)) 145 dev->agp = drm_legacy_agp_init(dev); 146 if (dev->agp) { 147 dev->agp->agp_mtrr = arch_phys_wc_add( 148 dev->agp->agp_info.aper_base, 149 dev->agp->agp_info.aper_size * 150 1024 * 1024); 151 } 152 } 153 } 154 155 static int drm_legacy_get_pci_dev(struct pci_dev *pdev, 156 const struct pci_device_id *ent, 157 const struct drm_driver *driver) 158 { 159 struct drm_device *dev; 160 int ret; 161 162 DRM_DEBUG("\n"); 163 164 dev = drm_dev_alloc(driver, &pdev->dev); 165 if (IS_ERR(dev)) 166 return PTR_ERR(dev); 167 168 ret = pci_enable_device(pdev); 169 if (ret) 170 goto err_free; 171 172 #ifdef __alpha__ 173 dev->hose = pdev->sysdata; 174 #endif 175 176 drm_legacy_pci_agp_init(dev); 177 178 ret = drm_dev_register(dev, ent->driver_data); 179 if (ret) 180 goto err_agp; 181 182 if (drm_core_check_feature(dev, DRIVER_LEGACY)) { 183 mutex_lock(&legacy_dev_list_lock); 184 list_add_tail(&dev->legacy_dev_list, &legacy_dev_list); 185 mutex_unlock(&legacy_dev_list_lock); 186 } 187 188 return 0; 189 190 err_agp: 191 drm_legacy_pci_agp_destroy(dev); 192 pci_disable_device(pdev); 193 err_free: 194 drm_dev_put(dev); 195 return ret; 196 } 197 198 /** 199 * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver 200 * @driver: DRM device driver 201 * @pdriver: PCI device driver 202 * 203 * This is only used by legacy dri1 drivers and deprecated. 204 * 205 * Return: 0 on success or a negative error code on failure. 206 */ 207 int drm_legacy_pci_init(const struct drm_driver *driver, 208 struct pci_driver *pdriver) 209 { 210 struct pci_dev *pdev = NULL; 211 const struct pci_device_id *pid; 212 int i; 213 214 DRM_DEBUG("\n"); 215 216 if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY))) 217 return -EINVAL; 218 219 /* If not using KMS, fall back to stealth mode manual scanning. */ 220 for (i = 0; pdriver->id_table[i].vendor != 0; i++) { 221 pid = &pdriver->id_table[i]; 222 223 /* Loop around setting up a DRM device for each PCI device 224 * matching our ID and device class. If we had the internal 225 * function that pci_get_subsys and pci_get_class used, we'd 226 * be able to just pass pid in instead of doing a two-stage 227 * thing. 228 */ 229 pdev = NULL; 230 while ((pdev = 231 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 232 pid->subdevice, pdev)) != NULL) { 233 if ((pdev->class & pid->class_mask) != pid->class) 234 continue; 235 236 /* stealth mode requires a manual probe */ 237 pci_dev_get(pdev); 238 drm_legacy_get_pci_dev(pdev, pid, driver); 239 } 240 } 241 return 0; 242 } 243 EXPORT_SYMBOL(drm_legacy_pci_init); 244 245 /** 246 * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver 247 * @driver: DRM device driver 248 * @pdriver: PCI device driver 249 * 250 * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This 251 * is deprecated and only used by dri1 drivers. 252 */ 253 void drm_legacy_pci_exit(const struct drm_driver *driver, 254 struct pci_driver *pdriver) 255 { 256 struct drm_device *dev, *tmp; 257 258 DRM_DEBUG("\n"); 259 260 if (!(driver->driver_features & DRIVER_LEGACY)) { 261 WARN_ON(1); 262 } else { 263 mutex_lock(&legacy_dev_list_lock); 264 list_for_each_entry_safe(dev, tmp, &legacy_dev_list, 265 legacy_dev_list) { 266 if (dev->driver == driver) { 267 list_del(&dev->legacy_dev_list); 268 drm_put_dev(dev); 269 } 270 } 271 mutex_unlock(&legacy_dev_list_lock); 272 } 273 DRM_INFO("Module unloaded\n"); 274 } 275 EXPORT_SYMBOL(drm_legacy_pci_exit); 276 277 #endif 278