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 #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
drm_pci_set_busid(struct drm_device * dev,struct drm_master * master)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
drm_legacy_pci_irq_by_busid(struct drm_device * dev,struct drm_irq_busid * p)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 */
drm_legacy_irq_by_busid(struct drm_device * dev,void * data,struct drm_file * file_priv)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
drm_legacy_pci_agp_destroy(struct drm_device * dev)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
drm_legacy_pci_agp_init(struct drm_device * dev)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
drm_legacy_get_pci_dev(struct pci_dev * pdev,const struct pci_device_id * ent,const struct drm_driver * driver)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 */
drm_legacy_pci_init(const struct drm_driver * driver,struct pci_driver * pdriver)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 */
drm_legacy_pci_exit(const struct drm_driver * driver,struct pci_driver * pdriver)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