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_pci.h>
34 #include <drm/drm_print.h>
35
36 #include "drm_internal.h"
37 #include "drm_legacy.h"
38
39 /**
40 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA.
41 * @dev: DRM device
42 * @size: size of block to allocate
43 * @align: alignment of block
44 *
45 * FIXME: This is a needless abstraction of the Linux dma-api and should be
46 * removed.
47 *
48 * Return: A handle to the allocated memory block on success or NULL on
49 * failure.
50 */
51 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
52 {
53 drm_dma_handle_t *dmah;
54
55 /* pci_alloc_consistent only guarantees alignment to the smallest
56 * PAGE_SIZE order which is greater than or equal to the requested size.
57 * Return NULL here for now to make sure nobody tries for larger alignment
58 */
59 if (align > size)
60 return NULL;
61
62 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
63 if (!dmah)
64 return NULL;
65
66 dmah->size = size;
67 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size,
68 &dmah->busaddr,
69 GFP_KERNEL);
70
71 if (dmah->vaddr == NULL) {
72 kfree(dmah);
73 return NULL;
74 }
75
76 return dmah;
77 }
78
79 EXPORT_SYMBOL(drm_pci_alloc);
80
81 /*
82 * Free a PCI consistent memory block without freeing its descriptor.
83 *
84 * This function is for internal use in the Linux-specific DRM core code.
85 */
86 void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
87 {
88 if (dmah->vaddr)
89 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
90 dmah->busaddr);
91 }
92
93 /**
94 * drm_pci_free - Free a PCI consistent memory block
95 * @dev: DRM device
96 * @dmah: handle to memory block
97 *
98 * FIXME: This is a needless abstraction of the Linux dma-api and should be
99 * removed.
100 */
101 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
102 {
103 __drm_legacy_pci_free(dev, dmah);
104 kfree(dmah);
105 }
106
107 EXPORT_SYMBOL(drm_pci_free);
108
109 #ifdef CONFIG_PCI
110
111 static int drm_get_pci_domain(struct drm_device *dev)
112 {
113 #ifndef __alpha__
114 /* For historical reasons, drm_get_pci_domain() is busticated
115 * on most archs and has to remain so for userspace interface
116 * < 1.4, except on alpha which was right from the beginning
117 */
118 if (dev->if_version < 0x10004)
119 return 0;
120 #endif /* __alpha__ */
121
122 return pci_domain_nr(dev->pdev->bus);
123 }
124
125 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
126 {
127 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
128 drm_get_pci_domain(dev),
129 dev->pdev->bus->number,
130 PCI_SLOT(dev->pdev->devfn),
131 PCI_FUNC(dev->pdev->devfn));
132 if (!master->unique)
133 return -ENOMEM;
134
135 master->unique_len = strlen(master->unique);
136 return 0;
137 }
138
139 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
140 {
141 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
142 (p->busnum & 0xff) != dev->pdev->bus->number ||
143 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
144 return -EINVAL;
145
146 p->irq = dev->pdev->irq;
147
148 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
149 p->irq);
150 return 0;
151 }
152
153 /**
154 * drm_irq_by_busid - Get interrupt from bus ID
155 * @dev: DRM device
156 * @data: IOCTL parameter pointing to a drm_irq_busid structure
157 * @file_priv: DRM file private.
158 *
159 * Finds the PCI device with the specified bus id and gets its IRQ number.
160 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
161 * to that of the device that this DRM instance attached to.
162 *
163 * Return: 0 on success or a negative error code on failure.
164 */
165 int drm_irq_by_busid(struct drm_device *dev, void *data,
166 struct drm_file *file_priv)
167 {
168 struct drm_irq_busid *p = data;
169
170 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
171 return -EOPNOTSUPP;
172
173 /* UMS was only ever support on PCI devices. */
174 if (WARN_ON(!dev->pdev))
175 return -EINVAL;
176
177 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
178 return -EOPNOTSUPP;
179
180 return drm_pci_irq_by_busid(dev, p);
181 }
182
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
197 void drm_pci_agp_destroy(struct drm_device *dev)
198 {
199 if (dev->agp) {
200 arch_phys_wc_del(dev->agp->agp_mtrr);
201 drm_legacy_agp_clear(dev);
202 kfree(dev->agp);
203 dev->agp = NULL;
204 }
205 }
206
207 /**
208 * drm_get_pci_dev - Register a PCI device with the DRM subsystem
209 * @pdev: PCI device
210 * @ent: entry from the PCI ID table that matches @pdev
211 * @driver: DRM device driver
212 *
213 * Attempt to gets inter module "drm" information. If we are first
214 * then register the character device and inter module information.
215 * Try and register, if we fail to register, backout previous work.
216 *
217 * NOTE: This function is deprecated, please use drm_dev_alloc() and
218 * drm_dev_register() instead and remove your &drm_driver.load callback.
219 *
220 * Return: 0 on success or a negative error code on failure.
221 */
222 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
223 struct drm_driver *driver)
224 {
225 struct drm_device *dev;
226 int ret;
227
228 DRM_DEBUG("\n");
229
230 dev = drm_dev_alloc(driver, &pdev->dev);
231 if (IS_ERR(dev))
232 return PTR_ERR(dev);
233
234 ret = pci_enable_device(pdev);
235 if (ret)
236 goto err_free;
237
238 dev->pdev = pdev;
239 #ifdef __alpha__
240 dev->hose = pdev->sysdata;
241 #endif
242
243 if (drm_core_check_feature(dev, DRIVER_MODESET))
244 pci_set_drvdata(pdev, dev);
245
246 drm_pci_agp_init(dev);
247
248 ret = drm_dev_register(dev, ent->driver_data);
249 if (ret)
250 goto err_agp;
251
252 /* No locking needed since shadow-attach is single-threaded since it may
253 * only be called from the per-driver module init hook. */
254 if (drm_core_check_feature(dev, DRIVER_LEGACY))
255 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
256
257 return 0;
258
259 err_agp:
260 drm_pci_agp_destroy(dev);
261 pci_disable_device(pdev);
262 err_free:
263 drm_dev_put(dev);
264 return ret;
265 }
266 EXPORT_SYMBOL(drm_get_pci_dev);
267
268 /**
269 * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver
270 * @driver: DRM device driver
271 * @pdriver: PCI device driver
272 *
273 * This is only used by legacy dri1 drivers and deprecated.
274 *
275 * Return: 0 on success or a negative error code on failure.
276 */
277 int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
278 {
279 struct pci_dev *pdev = NULL;
280 const struct pci_device_id *pid;
281 int i;
282
283 DRM_DEBUG("\n");
284
285 if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY)))
286 return -EINVAL;
287
288 /* If not using KMS, fall back to stealth mode manual scanning. */
289 INIT_LIST_HEAD(&driver->legacy_dev_list);
290 for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
291 pid = &pdriver->id_table[i];
292
293 /* Loop around setting up a DRM device for each PCI device
294 * matching our ID and device class. If we had the internal
295 * function that pci_get_subsys and pci_get_class used, we'd
296 * be able to just pass pid in instead of doing a two-stage
297 * thing.
298 */
299 pdev = NULL;
300 while ((pdev =
301 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
302 pid->subdevice, pdev)) != NULL) {
303 if ((pdev->class & pid->class_mask) != pid->class)
304 continue;
305
306 /* stealth mode requires a manual probe */
307 pci_dev_get(pdev);
308 drm_get_pci_dev(pdev, pid, driver);
309 }
310 }
311 return 0;
312 }
313 EXPORT_SYMBOL(drm_legacy_pci_init);
314
315 #else
316
317 void drm_pci_agp_destroy(struct drm_device *dev) {}
318
319 int drm_irq_by_busid(struct drm_device *dev, void *data,
320 struct drm_file *file_priv)
321 {
322 return -EINVAL;
323 }
324 #endif
325
326 /**
327 * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver
328 * @driver: DRM device driver
329 * @pdriver: PCI device driver
330 *
331 * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This
332 * is deprecated and only used by dri1 drivers.
333 */
334 void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
335 {
336 struct drm_device *dev, *tmp;
337 DRM_DEBUG("\n");
338
339 if (!(driver->driver_features & DRIVER_LEGACY)) {
340 WARN_ON(1);
341 } else {
342 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
343 legacy_dev_list) {
344 list_del(&dev->legacy_dev_list);
345 drm_put_dev(dev);
346 }
347 }
348 DRM_INFO("Module unloaded\n");
349 }
350 EXPORT_SYMBOL(drm_legacy_pci_exit);