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_print.h>
34
35 #include "drm_internal.h"
36 #include "drm_legacy.h"
37
38 #ifdef CONFIG_DRM_LEGACY
39
40 /**
41 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA.
42 * @dev: DRM device
43 * @size: size of block to allocate
44 * @align: alignment of block
45 *
46 * FIXME: This is a needless abstraction of the Linux dma-api and should be
47 * removed.
48 *
49 * Return: A handle to the allocated memory block on success or NULL on
50 * failure.
51 */
drm_pci_alloc(struct drm_device * dev,size_t size,size_t align)52 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
53 {
54 drm_dma_handle_t *dmah;
55
56 /* pci_alloc_consistent only guarantees alignment to the smallest
57 * PAGE_SIZE order which is greater than or equal to the requested size.
58 * Return NULL here for now to make sure nobody tries for larger alignment
59 */
60 if (align > size)
61 return NULL;
62
63 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
64 if (!dmah)
65 return NULL;
66
67 dmah->size = size;
68 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size,
69 &dmah->busaddr,
70 GFP_KERNEL);
71
72 if (dmah->vaddr == NULL) {
73 kfree(dmah);
74 return NULL;
75 }
76
77 return dmah;
78 }
79 EXPORT_SYMBOL(drm_pci_alloc);
80
81 /**
82 * drm_pci_free - Free a PCI consistent memory block
83 * @dev: DRM device
84 * @dmah: handle to memory block
85 *
86 * FIXME: This is a needless abstraction of the Linux dma-api and should be
87 * removed.
88 */
drm_pci_free(struct drm_device * dev,drm_dma_handle_t * dmah)89 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
90 {
91 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
92 dmah->busaddr);
93 kfree(dmah);
94 }
95
96 EXPORT_SYMBOL(drm_pci_free);
97 #endif
98
drm_get_pci_domain(struct drm_device * dev)99 static int drm_get_pci_domain(struct drm_device *dev)
100 {
101 #ifndef __alpha__
102 /* For historical reasons, drm_get_pci_domain() is busticated
103 * on most archs and has to remain so for userspace interface
104 * < 1.4, except on alpha which was right from the beginning
105 */
106 if (dev->if_version < 0x10004)
107 return 0;
108 #endif /* __alpha__ */
109
110 return pci_domain_nr(dev->pdev->bus);
111 }
112
drm_pci_set_busid(struct drm_device * dev,struct drm_master * master)113 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
114 {
115 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
116 drm_get_pci_domain(dev),
117 dev->pdev->bus->number,
118 PCI_SLOT(dev->pdev->devfn),
119 PCI_FUNC(dev->pdev->devfn));
120 if (!master->unique)
121 return -ENOMEM;
122
123 master->unique_len = strlen(master->unique);
124 return 0;
125 }
126
drm_pci_irq_by_busid(struct drm_device * dev,struct drm_irq_busid * p)127 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
128 {
129 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
130 (p->busnum & 0xff) != dev->pdev->bus->number ||
131 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
132 return -EINVAL;
133
134 p->irq = dev->pdev->irq;
135
136 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
137 p->irq);
138 return 0;
139 }
140
141 /**
142 * drm_irq_by_busid - Get interrupt from bus ID
143 * @dev: DRM device
144 * @data: IOCTL parameter pointing to a drm_irq_busid structure
145 * @file_priv: DRM file private.
146 *
147 * Finds the PCI device with the specified bus id and gets its IRQ number.
148 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
149 * to that of the device that this DRM instance attached to.
150 *
151 * Return: 0 on success or a negative error code on failure.
152 */
drm_irq_by_busid(struct drm_device * dev,void * data,struct drm_file * file_priv)153 int drm_irq_by_busid(struct drm_device *dev, void *data,
154 struct drm_file *file_priv)
155 {
156 struct drm_irq_busid *p = data;
157
158 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
159 return -EOPNOTSUPP;
160
161 /* UMS was only ever support on PCI devices. */
162 if (WARN_ON(!dev->pdev))
163 return -EINVAL;
164
165 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
166 return -EOPNOTSUPP;
167
168 return drm_pci_irq_by_busid(dev, p);
169 }
170
drm_pci_agp_destroy(struct drm_device * dev)171 void drm_pci_agp_destroy(struct drm_device *dev)
172 {
173 if (dev->agp) {
174 arch_phys_wc_del(dev->agp->agp_mtrr);
175 drm_legacy_agp_clear(dev);
176 kfree(dev->agp);
177 dev->agp = NULL;
178 }
179 }
180
181 #ifdef CONFIG_DRM_LEGACY
182
drm_pci_agp_init(struct drm_device * dev)183 static void drm_pci_agp_init(struct drm_device *dev)
184 {
185 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
186 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP))
187 dev->agp = drm_agp_init(dev);
188 if (dev->agp) {
189 dev->agp->agp_mtrr = arch_phys_wc_add(
190 dev->agp->agp_info.aper_base,
191 dev->agp->agp_info.aper_size *
192 1024 * 1024);
193 }
194 }
195 }
196
drm_get_pci_dev(struct pci_dev * pdev,const struct pci_device_id * ent,struct drm_driver * driver)197 static int drm_get_pci_dev(struct pci_dev *pdev,
198 const struct pci_device_id *ent,
199 struct drm_driver *driver)
200 {
201 struct drm_device *dev;
202 int ret;
203
204 DRM_DEBUG("\n");
205
206 dev = drm_dev_alloc(driver, &pdev->dev);
207 if (IS_ERR(dev))
208 return PTR_ERR(dev);
209
210 ret = pci_enable_device(pdev);
211 if (ret)
212 goto err_free;
213
214 dev->pdev = pdev;
215 #ifdef __alpha__
216 dev->hose = pdev->sysdata;
217 #endif
218
219 if (drm_core_check_feature(dev, DRIVER_MODESET))
220 pci_set_drvdata(pdev, dev);
221
222 drm_pci_agp_init(dev);
223
224 ret = drm_dev_register(dev, ent->driver_data);
225 if (ret)
226 goto err_agp;
227
228 /* No locking needed since shadow-attach is single-threaded since it may
229 * only be called from the per-driver module init hook. */
230 if (drm_core_check_feature(dev, DRIVER_LEGACY))
231 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
232
233 return 0;
234
235 err_agp:
236 drm_pci_agp_destroy(dev);
237 pci_disable_device(pdev);
238 err_free:
239 drm_dev_put(dev);
240 return ret;
241 }
242
243 /**
244 * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver
245 * @driver: DRM device driver
246 * @pdriver: PCI device driver
247 *
248 * This is only used by legacy dri1 drivers and deprecated.
249 *
250 * Return: 0 on success or a negative error code on failure.
251 */
drm_legacy_pci_init(struct drm_driver * driver,struct pci_driver * pdriver)252 int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
253 {
254 struct pci_dev *pdev = NULL;
255 const struct pci_device_id *pid;
256 int i;
257
258 DRM_DEBUG("\n");
259
260 if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY)))
261 return -EINVAL;
262
263 /* If not using KMS, fall back to stealth mode manual scanning. */
264 INIT_LIST_HEAD(&driver->legacy_dev_list);
265 for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
266 pid = &pdriver->id_table[i];
267
268 /* Loop around setting up a DRM device for each PCI device
269 * matching our ID and device class. If we had the internal
270 * function that pci_get_subsys and pci_get_class used, we'd
271 * be able to just pass pid in instead of doing a two-stage
272 * thing.
273 */
274 pdev = NULL;
275 while ((pdev =
276 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
277 pid->subdevice, pdev)) != NULL) {
278 if ((pdev->class & pid->class_mask) != pid->class)
279 continue;
280
281 /* stealth mode requires a manual probe */
282 pci_dev_get(pdev);
283 drm_get_pci_dev(pdev, pid, driver);
284 }
285 }
286 return 0;
287 }
288 EXPORT_SYMBOL(drm_legacy_pci_init);
289
290 /**
291 * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver
292 * @driver: DRM device driver
293 * @pdriver: PCI device driver
294 *
295 * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This
296 * is deprecated and only used by dri1 drivers.
297 */
drm_legacy_pci_exit(struct drm_driver * driver,struct pci_driver * pdriver)298 void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
299 {
300 struct drm_device *dev, *tmp;
301
302 DRM_DEBUG("\n");
303
304 if (!(driver->driver_features & DRIVER_LEGACY)) {
305 WARN_ON(1);
306 } else {
307 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
308 legacy_dev_list) {
309 list_del(&dev->legacy_dev_list);
310 drm_put_dev(dev);
311 }
312 }
313 DRM_INFO("Module unloaded\n");
314 }
315 EXPORT_SYMBOL(drm_legacy_pci_exit);
316
317 #endif
318