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 */
drm_pci_alloc(struct drm_device * dev,size_t size,size_t align)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 unsigned long addr;
55 size_t sz;
56
57 /* pci_alloc_consistent only guarantees alignment to the smallest
58 * PAGE_SIZE order which is greater than or equal to the requested size.
59 * Return NULL here for now to make sure nobody tries for larger alignment
60 */
61 if (align > size)
62 return NULL;
63
64 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
65 if (!dmah)
66 return NULL;
67
68 dmah->size = size;
69 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size,
70 &dmah->busaddr,
71 GFP_KERNEL | __GFP_COMP);
72
73 if (dmah->vaddr == NULL) {
74 kfree(dmah);
75 return NULL;
76 }
77
78 /* XXX - Is virt_to_page() legal for consistent mem? */
79 /* Reserve */
80 for (addr = (unsigned long)dmah->vaddr, sz = size;
81 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
82 SetPageReserved(virt_to_page((void *)addr));
83 }
84
85 return dmah;
86 }
87
88 EXPORT_SYMBOL(drm_pci_alloc);
89
90 /*
91 * Free a PCI consistent memory block without freeing its descriptor.
92 *
93 * This function is for internal use in the Linux-specific DRM core code.
94 */
__drm_legacy_pci_free(struct drm_device * dev,drm_dma_handle_t * dmah)95 void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
96 {
97 unsigned long addr;
98 size_t sz;
99
100 if (dmah->vaddr) {
101 /* XXX - Is virt_to_page() legal for consistent mem? */
102 /* Unreserve */
103 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
104 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
105 ClearPageReserved(virt_to_page((void *)addr));
106 }
107 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
108 dmah->busaddr);
109 }
110 }
111
112 /**
113 * drm_pci_free - Free a PCI consistent memory block
114 * @dev: DRM device
115 * @dmah: handle to memory block
116 *
117 * FIXME: This is a needless abstraction of the Linux dma-api and should be
118 * removed.
119 */
drm_pci_free(struct drm_device * dev,drm_dma_handle_t * dmah)120 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
121 {
122 __drm_legacy_pci_free(dev, dmah);
123 kfree(dmah);
124 }
125
126 EXPORT_SYMBOL(drm_pci_free);
127
128 #ifdef CONFIG_PCI
129
drm_get_pci_domain(struct drm_device * dev)130 static int drm_get_pci_domain(struct drm_device *dev)
131 {
132 #ifndef __alpha__
133 /* For historical reasons, drm_get_pci_domain() is busticated
134 * on most archs and has to remain so for userspace interface
135 * < 1.4, except on alpha which was right from the beginning
136 */
137 if (dev->if_version < 0x10004)
138 return 0;
139 #endif /* __alpha__ */
140
141 return pci_domain_nr(dev->pdev->bus);
142 }
143
drm_pci_set_busid(struct drm_device * dev,struct drm_master * master)144 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
145 {
146 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
147 drm_get_pci_domain(dev),
148 dev->pdev->bus->number,
149 PCI_SLOT(dev->pdev->devfn),
150 PCI_FUNC(dev->pdev->devfn));
151 if (!master->unique)
152 return -ENOMEM;
153
154 master->unique_len = strlen(master->unique);
155 return 0;
156 }
157
drm_pci_irq_by_busid(struct drm_device * dev,struct drm_irq_busid * p)158 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
159 {
160 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
161 (p->busnum & 0xff) != dev->pdev->bus->number ||
162 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
163 return -EINVAL;
164
165 p->irq = dev->pdev->irq;
166
167 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
168 p->irq);
169 return 0;
170 }
171
172 /**
173 * drm_irq_by_busid - Get interrupt from bus ID
174 * @dev: DRM device
175 * @data: IOCTL parameter pointing to a drm_irq_busid structure
176 * @file_priv: DRM file private.
177 *
178 * Finds the PCI device with the specified bus id and gets its IRQ number.
179 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
180 * to that of the device that this DRM instance attached to.
181 *
182 * Return: 0 on success or a negative error code on failure.
183 */
drm_irq_by_busid(struct drm_device * dev,void * data,struct drm_file * file_priv)184 int drm_irq_by_busid(struct drm_device *dev, void *data,
185 struct drm_file *file_priv)
186 {
187 struct drm_irq_busid *p = data;
188
189 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
190 return -EOPNOTSUPP;
191
192 /* UMS was only ever support on PCI devices. */
193 if (WARN_ON(!dev->pdev))
194 return -EINVAL;
195
196 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
197 return -EOPNOTSUPP;
198
199 return drm_pci_irq_by_busid(dev, p);
200 }
201
drm_pci_agp_init(struct drm_device * dev)202 static void drm_pci_agp_init(struct drm_device *dev)
203 {
204 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
205 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP))
206 dev->agp = drm_agp_init(dev);
207 if (dev->agp) {
208 dev->agp->agp_mtrr = arch_phys_wc_add(
209 dev->agp->agp_info.aper_base,
210 dev->agp->agp_info.aper_size *
211 1024 * 1024);
212 }
213 }
214 }
215
drm_pci_agp_destroy(struct drm_device * dev)216 void drm_pci_agp_destroy(struct drm_device *dev)
217 {
218 if (dev->agp) {
219 arch_phys_wc_del(dev->agp->agp_mtrr);
220 drm_legacy_agp_clear(dev);
221 kfree(dev->agp);
222 dev->agp = NULL;
223 }
224 }
225
226 /**
227 * drm_get_pci_dev - Register a PCI device with the DRM subsystem
228 * @pdev: PCI device
229 * @ent: entry from the PCI ID table that matches @pdev
230 * @driver: DRM device driver
231 *
232 * Attempt to gets inter module "drm" information. If we are first
233 * then register the character device and inter module information.
234 * Try and register, if we fail to register, backout previous work.
235 *
236 * NOTE: This function is deprecated, please use drm_dev_alloc() and
237 * drm_dev_register() instead and remove your &drm_driver.load callback.
238 *
239 * Return: 0 on success or a negative error code on failure.
240 */
drm_get_pci_dev(struct pci_dev * pdev,const struct pci_device_id * ent,struct drm_driver * driver)241 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
242 struct drm_driver *driver)
243 {
244 struct drm_device *dev;
245 int ret;
246
247 DRM_DEBUG("\n");
248
249 dev = drm_dev_alloc(driver, &pdev->dev);
250 if (IS_ERR(dev))
251 return PTR_ERR(dev);
252
253 ret = pci_enable_device(pdev);
254 if (ret)
255 goto err_free;
256
257 dev->pdev = pdev;
258 #ifdef __alpha__
259 dev->hose = pdev->sysdata;
260 #endif
261
262 if (drm_core_check_feature(dev, DRIVER_MODESET))
263 pci_set_drvdata(pdev, dev);
264
265 drm_pci_agp_init(dev);
266
267 ret = drm_dev_register(dev, ent->driver_data);
268 if (ret)
269 goto err_agp;
270
271 /* No locking needed since shadow-attach is single-threaded since it may
272 * only be called from the per-driver module init hook. */
273 if (drm_core_check_feature(dev, DRIVER_LEGACY))
274 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
275
276 return 0;
277
278 err_agp:
279 drm_pci_agp_destroy(dev);
280 pci_disable_device(pdev);
281 err_free:
282 drm_dev_put(dev);
283 return ret;
284 }
285 EXPORT_SYMBOL(drm_get_pci_dev);
286
287 /**
288 * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver
289 * @driver: DRM device driver
290 * @pdriver: PCI device driver
291 *
292 * This is only used by legacy dri1 drivers and deprecated.
293 *
294 * Return: 0 on success or a negative error code on failure.
295 */
drm_legacy_pci_init(struct drm_driver * driver,struct pci_driver * pdriver)296 int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
297 {
298 struct pci_dev *pdev = NULL;
299 const struct pci_device_id *pid;
300 int i;
301
302 DRM_DEBUG("\n");
303
304 if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY)))
305 return -EINVAL;
306
307 /* If not using KMS, fall back to stealth mode manual scanning. */
308 INIT_LIST_HEAD(&driver->legacy_dev_list);
309 for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
310 pid = &pdriver->id_table[i];
311
312 /* Loop around setting up a DRM device for each PCI device
313 * matching our ID and device class. If we had the internal
314 * function that pci_get_subsys and pci_get_class used, we'd
315 * be able to just pass pid in instead of doing a two-stage
316 * thing.
317 */
318 pdev = NULL;
319 while ((pdev =
320 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
321 pid->subdevice, pdev)) != NULL) {
322 if ((pdev->class & pid->class_mask) != pid->class)
323 continue;
324
325 /* stealth mode requires a manual probe */
326 pci_dev_get(pdev);
327 drm_get_pci_dev(pdev, pid, driver);
328 }
329 }
330 return 0;
331 }
332 EXPORT_SYMBOL(drm_legacy_pci_init);
333
334 #else
335
drm_pci_agp_destroy(struct drm_device * dev)336 void drm_pci_agp_destroy(struct drm_device *dev) {}
337
drm_irq_by_busid(struct drm_device * dev,void * data,struct drm_file * file_priv)338 int drm_irq_by_busid(struct drm_device *dev, void *data,
339 struct drm_file *file_priv)
340 {
341 return -EINVAL;
342 }
343 #endif
344
345 /**
346 * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver
347 * @driver: DRM device driver
348 * @pdriver: PCI device driver
349 *
350 * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This
351 * is deprecated and only used by dri1 drivers.
352 */
drm_legacy_pci_exit(struct drm_driver * driver,struct pci_driver * pdriver)353 void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
354 {
355 struct drm_device *dev, *tmp;
356 DRM_DEBUG("\n");
357
358 if (!(driver->driver_features & DRIVER_LEGACY)) {
359 WARN_ON(1);
360 } else {
361 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
362 legacy_dev_list) {
363 list_del(&dev->legacy_dev_list);
364 drm_put_dev(dev);
365 }
366 }
367 DRM_INFO("Module unloaded\n");
368 }
369 EXPORT_SYMBOL(drm_legacy_pci_exit);
370