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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_auth.h>
33#include <drm/drm.h>
34#include <drm/drm_drv.h>
35#include <drm/drm_print.h>
36
37#include "drm_internal.h"
38
39static int drm_get_pci_domain(struct drm_device *dev)
40{
41#ifndef __alpha__
42 /* For historical reasons, drm_get_pci_domain() is busticated
43 * on most archs and has to remain so for userspace interface
44 * < 1.4, except on alpha which was right from the beginning
45 */
46 if (dev->if_version < 0x10004)
47 return 0;
48#endif /* __alpha__ */
49
50 return pci_domain_nr(to_pci_dev(dev->dev)->bus);
51}
52
53int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
54{
55 struct pci_dev *pdev = to_pci_dev(dev->dev);
56
57 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
58 drm_get_pci_domain(dev),
59 pdev->bus->number,
60 PCI_SLOT(pdev->devfn),
61 PCI_FUNC(pdev->devfn));
62 if (!master->unique)
63 return -ENOMEM;
64
65 master->unique_len = strlen(master->unique);
66 return 0;
67}
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/pci.h>
26#include <linux/slab.h>
27#include <linux/dma-mapping.h>
28#include <linux/export.h>
29#include <drm/drm_pci.h>
30#include <drm/drmP.h>
31#include "drm_internal.h"
32#include "drm_legacy.h"
33
34/**
35 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA.
36 * @dev: DRM device
37 * @size: size of block to allocate
38 * @align: alignment of block
39 *
40 * FIXME: This is a needless abstraction of the Linux dma-api and should be
41 * removed.
42 *
43 * Return: A handle to the allocated memory block on success or NULL on
44 * failure.
45 */
46drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
47{
48 drm_dma_handle_t *dmah;
49 unsigned long addr;
50 size_t sz;
51
52 /* pci_alloc_consistent only guarantees alignment to the smallest
53 * PAGE_SIZE order which is greater than or equal to the requested size.
54 * Return NULL here for now to make sure nobody tries for larger alignment
55 */
56 if (align > size)
57 return NULL;
58
59 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
60 if (!dmah)
61 return NULL;
62
63 dmah->size = size;
64 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
65
66 if (dmah->vaddr == NULL) {
67 kfree(dmah);
68 return NULL;
69 }
70
71 memset(dmah->vaddr, 0, size);
72
73 /* XXX - Is virt_to_page() legal for consistent mem? */
74 /* Reserve */
75 for (addr = (unsigned long)dmah->vaddr, sz = size;
76 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
77 SetPageReserved(virt_to_page((void *)addr));
78 }
79
80 return dmah;
81}
82
83EXPORT_SYMBOL(drm_pci_alloc);
84
85/*
86 * Free a PCI consistent memory block without freeing its descriptor.
87 *
88 * This function is for internal use in the Linux-specific DRM core code.
89 */
90void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
91{
92 unsigned long addr;
93 size_t sz;
94
95 if (dmah->vaddr) {
96 /* XXX - Is virt_to_page() legal for consistent mem? */
97 /* Unreserve */
98 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
99 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
100 ClearPageReserved(virt_to_page((void *)addr));
101 }
102 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
103 dmah->busaddr);
104 }
105}
106
107/**
108 * drm_pci_free - Free a PCI consistent memory block
109 * @dev: DRM device
110 * @dmah: handle to memory block
111 *
112 * FIXME: This is a needless abstraction of the Linux dma-api and should be
113 * removed.
114 */
115void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
116{
117 __drm_legacy_pci_free(dev, dmah);
118 kfree(dmah);
119}
120
121EXPORT_SYMBOL(drm_pci_free);
122
123#ifdef CONFIG_PCI
124
125static int drm_get_pci_domain(struct drm_device *dev)
126{
127#ifndef __alpha__
128 /* For historical reasons, drm_get_pci_domain() is busticated
129 * on most archs and has to remain so for userspace interface
130 * < 1.4, except on alpha which was right from the beginning
131 */
132 if (dev->if_version < 0x10004)
133 return 0;
134#endif /* __alpha__ */
135
136 return pci_domain_nr(dev->pdev->bus);
137}
138
139int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
140{
141 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
142 drm_get_pci_domain(dev),
143 dev->pdev->bus->number,
144 PCI_SLOT(dev->pdev->devfn),
145 PCI_FUNC(dev->pdev->devfn));
146 if (!master->unique)
147 return -ENOMEM;
148
149 master->unique_len = strlen(master->unique);
150 return 0;
151}
152
153static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
154{
155 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
156 (p->busnum & 0xff) != dev->pdev->bus->number ||
157 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
158 return -EINVAL;
159
160 p->irq = dev->pdev->irq;
161
162 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
163 p->irq);
164 return 0;
165}
166
167/**
168 * drm_irq_by_busid - Get interrupt from bus ID
169 * @dev: DRM device
170 * @data: IOCTL parameter pointing to a drm_irq_busid structure
171 * @file_priv: DRM file private.
172 *
173 * Finds the PCI device with the specified bus id and gets its IRQ number.
174 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
175 * to that of the device that this DRM instance attached to.
176 *
177 * Return: 0 on success or a negative error code on failure.
178 */
179int drm_irq_by_busid(struct drm_device *dev, void *data,
180 struct drm_file *file_priv)
181{
182 struct drm_irq_busid *p = data;
183
184 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
185 return -EINVAL;
186
187 /* UMS was only ever support on PCI devices. */
188 if (WARN_ON(!dev->pdev))
189 return -EINVAL;
190
191 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
192 return -EINVAL;
193
194 return drm_pci_irq_by_busid(dev, p);
195}
196
197static void drm_pci_agp_init(struct drm_device *dev)
198{
199 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
200 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP))
201 dev->agp = drm_agp_init(dev);
202 if (dev->agp) {
203 dev->agp->agp_mtrr = arch_phys_wc_add(
204 dev->agp->agp_info.aper_base,
205 dev->agp->agp_info.aper_size *
206 1024 * 1024);
207 }
208 }
209}
210
211void drm_pci_agp_destroy(struct drm_device *dev)
212{
213 if (dev->agp) {
214 arch_phys_wc_del(dev->agp->agp_mtrr);
215 drm_legacy_agp_clear(dev);
216 kfree(dev->agp);
217 dev->agp = NULL;
218 }
219}
220
221/**
222 * drm_get_pci_dev - Register a PCI device with the DRM subsystem
223 * @pdev: PCI device
224 * @ent: entry from the PCI ID table that matches @pdev
225 * @driver: DRM device driver
226 *
227 * Attempt to gets inter module "drm" information. If we are first
228 * then register the character device and inter module information.
229 * Try and register, if we fail to register, backout previous work.
230 *
231 * NOTE: This function is deprecated, please use drm_dev_alloc() and
232 * drm_dev_register() instead and remove your &drm_driver.load callback.
233 *
234 * Return: 0 on success or a negative error code on failure.
235 */
236int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
237 struct drm_driver *driver)
238{
239 struct drm_device *dev;
240 int ret;
241
242 DRM_DEBUG("\n");
243
244 dev = drm_dev_alloc(driver, &pdev->dev);
245 if (IS_ERR(dev))
246 return PTR_ERR(dev);
247
248 ret = pci_enable_device(pdev);
249 if (ret)
250 goto err_free;
251
252 dev->pdev = pdev;
253#ifdef __alpha__
254 dev->hose = pdev->sysdata;
255#endif
256
257 if (drm_core_check_feature(dev, DRIVER_MODESET))
258 pci_set_drvdata(pdev, dev);
259
260 drm_pci_agp_init(dev);
261
262 ret = drm_dev_register(dev, ent->driver_data);
263 if (ret)
264 goto err_agp;
265
266 /* No locking needed since shadow-attach is single-threaded since it may
267 * only be called from the per-driver module init hook. */
268 if (drm_core_check_feature(dev, DRIVER_LEGACY))
269 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
270
271 return 0;
272
273err_agp:
274 drm_pci_agp_destroy(dev);
275 pci_disable_device(pdev);
276err_free:
277 drm_dev_put(dev);
278 return ret;
279}
280EXPORT_SYMBOL(drm_get_pci_dev);
281
282/**
283 * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver
284 * @driver: DRM device driver
285 * @pdriver: PCI device driver
286 *
287 * This is only used by legacy dri1 drivers and deprecated.
288 *
289 * Return: 0 on success or a negative error code on failure.
290 */
291int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
292{
293 struct pci_dev *pdev = NULL;
294 const struct pci_device_id *pid;
295 int i;
296
297 DRM_DEBUG("\n");
298
299 if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY)))
300 return -EINVAL;
301
302 /* If not using KMS, fall back to stealth mode manual scanning. */
303 INIT_LIST_HEAD(&driver->legacy_dev_list);
304 for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
305 pid = &pdriver->id_table[i];
306
307 /* Loop around setting up a DRM device for each PCI device
308 * matching our ID and device class. If we had the internal
309 * function that pci_get_subsys and pci_get_class used, we'd
310 * be able to just pass pid in instead of doing a two-stage
311 * thing.
312 */
313 pdev = NULL;
314 while ((pdev =
315 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
316 pid->subdevice, pdev)) != NULL) {
317 if ((pdev->class & pid->class_mask) != pid->class)
318 continue;
319
320 /* stealth mode requires a manual probe */
321 pci_dev_get(pdev);
322 drm_get_pci_dev(pdev, pid, driver);
323 }
324 }
325 return 0;
326}
327EXPORT_SYMBOL(drm_legacy_pci_init);
328
329int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
330{
331 struct pci_dev *root;
332 u32 lnkcap, lnkcap2;
333
334 *mask = 0;
335 if (!dev->pdev)
336 return -EINVAL;
337
338 root = dev->pdev->bus->self;
339
340 /* we've been informed via and serverworks don't make the cut */
341 if (root->vendor == PCI_VENDOR_ID_VIA ||
342 root->vendor == PCI_VENDOR_ID_SERVERWORKS)
343 return -EINVAL;
344
345 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
346 pcie_capability_read_dword(root, PCI_EXP_LNKCAP2, &lnkcap2);
347
348 if (lnkcap2) { /* PCIe r3.0-compliant */
349 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
350 *mask |= DRM_PCIE_SPEED_25;
351 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
352 *mask |= DRM_PCIE_SPEED_50;
353 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
354 *mask |= DRM_PCIE_SPEED_80;
355 } else { /* pre-r3.0 */
356 if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB)
357 *mask |= DRM_PCIE_SPEED_25;
358 if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB)
359 *mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50);
360 }
361
362 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2);
363 return 0;
364}
365EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
366
367int drm_pcie_get_max_link_width(struct drm_device *dev, u32 *mlw)
368{
369 struct pci_dev *root;
370 u32 lnkcap;
371
372 *mlw = 0;
373 if (!dev->pdev)
374 return -EINVAL;
375
376 root = dev->pdev->bus->self;
377
378 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
379
380 *mlw = (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4;
381
382 DRM_INFO("probing mlw for device %x:%x = %x\n", root->vendor, root->device, lnkcap);
383 return 0;
384}
385EXPORT_SYMBOL(drm_pcie_get_max_link_width);
386
387#else
388
389void drm_pci_agp_destroy(struct drm_device *dev) {}
390
391int drm_irq_by_busid(struct drm_device *dev, void *data,
392 struct drm_file *file_priv)
393{
394 return -EINVAL;
395}
396#endif
397
398/**
399 * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver
400 * @driver: DRM device driver
401 * @pdriver: PCI device driver
402 *
403 * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This
404 * is deprecated and only used by dri1 drivers.
405 */
406void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
407{
408 struct drm_device *dev, *tmp;
409 DRM_DEBUG("\n");
410
411 if (!(driver->driver_features & DRIVER_LEGACY)) {
412 WARN_ON(1);
413 } else {
414 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
415 legacy_dev_list) {
416 list_del(&dev->legacy_dev_list);
417 drm_put_dev(dev);
418 }
419 }
420 DRM_INFO("Module unloaded\n");
421}
422EXPORT_SYMBOL(drm_legacy_pci_exit);