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