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