blob: 5320364582ce144912354bfb62587a6c2233fcfb [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */
2/**
3 * \file drm_pci.c
4 * \brief Functions and ioctls to manage PCI memory
5 *
6 * \warning These interfaces aren't stable yet.
7 *
8 * \todo Implement the remaining ioctl's for the PCI pools.
9 * \todo The wrappers here are so thin that they would be better off inlined..
10 *
Jan Engelhardt96de0e22007-10-19 23:21:04 +020011 * \author José Fonseca <jrfonseca@tungstengraphics.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * \author Leif Delgass <ldelgass@retinalburn.net>
13 */
14
15/*
Jan Engelhardt96de0e22007-10-19 23:21:04 +020016 * Copyright 2003 José Fonseca.
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 * Copyright 2003 Leif Delgass.
18 * All Rights Reserved.
19 *
20 * Permission is hereby granted, free of charge, to any person obtaining a
21 * copy of this software and associated documentation files (the "Software"),
22 * to deal in the Software without restriction, including without limitation
23 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
24 * and/or sell copies of the Software, and to permit persons to whom the
25 * Software is furnished to do so, subject to the following conditions:
26 *
27 * The above copyright notice and this permission notice (including the next
28 * paragraph) shall be included in all copies or substantial portions of the
29 * Software.
30 *
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
32 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
33 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
34 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
35 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
36 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
37 */
38
39#include <linux/pci.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Dave Airlie195b3a22006-04-05 18:12:18 +100041#include <linux/dma-mapping.h>
Paul Gortmaker2d1a8a42011-08-30 18:16:33 -040042#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include "drmP.h"
44
45/**********************************************************************/
46/** \name PCI memory */
47/*@{*/
48
49/**
50 * \brief Allocate a PCI consistent memory block, for DMA.
51 */
Zhenyu Wange6be8d92010-01-05 11:25:05 +080052drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053{
Dave Airlie9c8da5e2005-07-10 15:38:56 +100054 drm_dma_handle_t *dmah;
Dave Airlieddf19b92006-03-19 18:56:12 +110055#if 1
56 unsigned long addr;
57 size_t sz;
58#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60 /* pci_alloc_consistent only guarantees alignment to the smallest
61 * PAGE_SIZE order which is greater than or equal to the requested size.
62 * Return NULL here for now to make sure nobody tries for larger alignment
63 */
64 if (align > size)
65 return NULL;
66
Dave Airlie9c8da5e2005-07-10 15:38:56 +100067 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
68 if (!dmah)
69 return NULL;
Dave Airlieb5e89ed2005-09-25 14:28:13 +100070
Dave Airlie9c8da5e2005-07-10 15:38:56 +100071 dmah->size = size;
Dave Airlieddf19b92006-03-19 18:56:12 +110072 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Dave Airlie9c8da5e2005-07-10 15:38:56 +100074 if (dmah->vaddr == NULL) {
75 kfree(dmah);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 return NULL;
Dave Airlie9c8da5e2005-07-10 15:38:56 +100077 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Dave Airlie9c8da5e2005-07-10 15:38:56 +100079 memset(dmah->vaddr, 0, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Dave Airlieddf19b92006-03-19 18:56:12 +110081 /* XXX - Is virt_to_page() legal for consistent mem? */
82 /* Reserve */
83 for (addr = (unsigned long)dmah->vaddr, sz = size;
84 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
85 SetPageReserved(virt_to_page(addr));
86 }
87
Dave Airlie9c8da5e2005-07-10 15:38:56 +100088 return dmah;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089}
Dave Airlieb5e89ed2005-09-25 14:28:13 +100090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091EXPORT_SYMBOL(drm_pci_alloc);
92
93/**
Dave Airlieddf19b92006-03-19 18:56:12 +110094 * \brief Free a PCI consistent memory block without freeing its descriptor.
Dave Airlie9c8da5e2005-07-10 15:38:56 +100095 *
96 * This function is for internal use in the Linux-specific DRM core code.
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 */
Dave Airlie84b1fd12007-07-11 15:53:27 +100098void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
Linus Torvalds1da177e2005-04-16 15:20:36 -070099{
Dave Airlieddf19b92006-03-19 18:56:12 +1100100#if 1
101 unsigned long addr;
102 size_t sz;
103#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
Eric Anholt9a298b22009-03-24 12:23:04 -0700105 if (dmah->vaddr) {
Dave Airlieddf19b92006-03-19 18:56:12 +1100106 /* XXX - Is virt_to_page() legal for consistent mem? */
107 /* Unreserve */
108 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
109 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
110 ClearPageReserved(virt_to_page(addr));
111 }
112 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
113 dmah->busaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115}
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000116
117/**
118 * \brief Free a PCI consistent memory block
119 */
Dave Airlie84b1fd12007-07-11 15:53:27 +1000120void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000121{
122 __drm_pci_free(dev, dmah);
123 kfree(dmah);
124}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126EXPORT_SYMBOL(drm_pci_free);
127
Jordan Crousedcdb1672010-05-27 13:40:25 -0600128#ifdef CONFIG_PCI
Dave Airlie8410ea32010-12-15 03:16:38 +1000129
130static 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
144static int drm_pci_get_irq(struct drm_device *dev)
145{
146 return dev->pdev->irq;
147}
148
149static const char *drm_pci_get_name(struct drm_device *dev)
150{
151 struct pci_driver *pdriver = dev->driver->kdriver.pci;
152 return pdriver->name;
153}
154
155int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
156{
157 int len, ret;
158 struct pci_driver *pdriver = dev->driver->kdriver.pci;
159 master->unique_len = 40;
160 master->unique_size = master->unique_len;
161 master->unique = kmalloc(master->unique_size, GFP_KERNEL);
162 if (master->unique == NULL)
163 return -ENOMEM;
164
165
166 len = snprintf(master->unique, master->unique_len,
167 "pci:%04x:%02x:%02x.%d",
168 drm_get_pci_domain(dev),
169 dev->pdev->bus->number,
170 PCI_SLOT(dev->pdev->devfn),
171 PCI_FUNC(dev->pdev->devfn));
172
173 if (len >= master->unique_len) {
174 DRM_ERROR("buffer overflow");
175 ret = -EINVAL;
176 goto err;
177 } else
178 master->unique_len = len;
179
180 dev->devname =
181 kmalloc(strlen(pdriver->name) +
182 master->unique_len + 2, GFP_KERNEL);
183
184 if (dev->devname == NULL) {
185 ret = -ENOMEM;
186 goto err;
187 }
188
189 sprintf(dev->devname, "%s@%s", pdriver->name,
190 master->unique);
191
192 return 0;
193err:
194 return ret;
195}
196
197int drm_pci_set_unique(struct drm_device *dev,
198 struct drm_master *master,
199 struct drm_unique *u)
200{
201 int domain, bus, slot, func, ret;
202 const char *bus_name;
203
204 master->unique_len = u->unique_len;
205 master->unique_size = u->unique_len + 1;
206 master->unique = kmalloc(master->unique_size, GFP_KERNEL);
207 if (!master->unique) {
208 ret = -ENOMEM;
209 goto err;
210 }
211
212 if (copy_from_user(master->unique, u->unique, master->unique_len)) {
213 ret = -EFAULT;
214 goto err;
215 }
216
217 master->unique[master->unique_len] = '\0';
218
219 bus_name = dev->driver->bus->get_name(dev);
220 dev->devname = kmalloc(strlen(bus_name) +
221 strlen(master->unique) + 2, GFP_KERNEL);
222 if (!dev->devname) {
223 ret = -ENOMEM;
224 goto err;
225 }
226
227 sprintf(dev->devname, "%s@%s", bus_name,
228 master->unique);
229
230 /* Return error if the busid submitted doesn't match the device's actual
231 * busid.
232 */
233 ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
234 if (ret != 3) {
235 ret = -EINVAL;
236 goto err;
237 }
238
239 domain = bus >> 8;
240 bus &= 0xff;
241
242 if ((domain != drm_get_pci_domain(dev)) ||
243 (bus != dev->pdev->bus->number) ||
244 (slot != PCI_SLOT(dev->pdev->devfn)) ||
245 (func != PCI_FUNC(dev->pdev->devfn))) {
246 ret = -EINVAL;
247 goto err;
248 }
249 return 0;
250err:
251 return ret;
252}
253
254
Wolfram Sang45e97ab2011-06-15 11:26:47 +0200255static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
Dave Airlie8410ea32010-12-15 03:16:38 +1000256{
257 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
258 (p->busnum & 0xff) != dev->pdev->bus->number ||
259 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
260 return -EINVAL;
261
262 p->irq = dev->pdev->irq;
263
264 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
265 p->irq);
266 return 0;
267}
268
269int drm_pci_agp_init(struct drm_device *dev)
270{
271 if (drm_core_has_AGP(dev)) {
272 if (drm_pci_device_is_agp(dev))
273 dev->agp = drm_agp_init(dev);
274 if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
275 && (dev->agp == NULL)) {
276 DRM_ERROR("Cannot initialize the agpgart module.\n");
277 return -EINVAL;
278 }
279 if (drm_core_has_MTRR(dev)) {
280 if (dev->agp)
281 dev->agp->agp_mtrr =
282 mtrr_add(dev->agp->agp_info.aper_base,
283 dev->agp->agp_info.aper_size *
284 1024 * 1024, MTRR_TYPE_WRCOMB, 1);
285 }
286 }
287 return 0;
288}
289
290static struct drm_bus drm_pci_bus = {
291 .bus_type = DRIVER_BUS_PCI,
292 .get_irq = drm_pci_get_irq,
293 .get_name = drm_pci_get_name,
294 .set_busid = drm_pci_set_busid,
295 .set_unique = drm_pci_set_unique,
Wolfram Sang45e97ab2011-06-15 11:26:47 +0200296 .irq_by_busid = drm_pci_irq_by_busid,
Dave Airlie8410ea32010-12-15 03:16:38 +1000297 .agp_init = drm_pci_agp_init,
298};
299
Jordan Crousedcdb1672010-05-27 13:40:25 -0600300/**
301 * Register.
302 *
303 * \param pdev - PCI device structure
304 * \param ent entry from the PCI ID table with device type flags
305 * \return zero on success or a negative number on failure.
306 *
307 * Attempt to gets inter module "drm" information. If we are first
308 * then register the character device and inter module information.
309 * Try and register, if we fail to register, backout previous work.
310 */
311int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
312 struct drm_driver *driver)
313{
314 struct drm_device *dev;
315 int ret;
316
317 DRM_DEBUG("\n");
318
319 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
320 if (!dev)
321 return -ENOMEM;
322
323 ret = pci_enable_device(pdev);
324 if (ret)
325 goto err_g1;
326
Jordan Crousedcdb1672010-05-27 13:40:25 -0600327 dev->pdev = pdev;
328 dev->dev = &pdev->dev;
329
330 dev->pci_device = pdev->device;
331 dev->pci_vendor = pdev->vendor;
332
333#ifdef __alpha__
334 dev->hose = pdev->sysdata;
335#endif
336
Dave Airlieb64c1152010-09-14 20:14:38 +1000337 mutex_lock(&drm_global_mutex);
338
Jordan Crousedcdb1672010-05-27 13:40:25 -0600339 if ((ret = drm_fill_in_dev(dev, ent, driver))) {
340 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
341 goto err_g2;
342 }
343
344 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
345 pci_set_drvdata(pdev, dev);
346 ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
347 if (ret)
348 goto err_g2;
349 }
350
351 if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
352 goto err_g3;
353
354 if (dev->driver->load) {
355 ret = dev->driver->load(dev, ent->driver_data);
356 if (ret)
357 goto err_g4;
358 }
359
360 /* setup the grouping for the legacy output */
361 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
362 ret = drm_mode_group_init_legacy_group(dev,
363 &dev->primary->mode_group);
364 if (ret)
365 goto err_g4;
366 }
367
368 list_add_tail(&dev->driver_item, &driver->device_list);
369
370 DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
371 driver->name, driver->major, driver->minor, driver->patchlevel,
372 driver->date, pci_name(pdev), dev->primary->index);
373
Dave Airlieb64c1152010-09-14 20:14:38 +1000374 mutex_unlock(&drm_global_mutex);
Jordan Crousedcdb1672010-05-27 13:40:25 -0600375 return 0;
376
377err_g4:
378 drm_put_minor(&dev->primary);
379err_g3:
380 if (drm_core_check_feature(dev, DRIVER_MODESET))
381 drm_put_minor(&dev->control);
382err_g2:
383 pci_disable_device(pdev);
384err_g1:
385 kfree(dev);
Dave Airlieb64c1152010-09-14 20:14:38 +1000386 mutex_unlock(&drm_global_mutex);
Jordan Crousedcdb1672010-05-27 13:40:25 -0600387 return ret;
388}
389EXPORT_SYMBOL(drm_get_pci_dev);
390
391/**
Dave Airlie8410ea32010-12-15 03:16:38 +1000392 * PCI device initialization. Called direct from modules at load time.
Jordan Crousedcdb1672010-05-27 13:40:25 -0600393 *
394 * \return zero on success or a negative number on failure.
395 *
396 * Initializes a drm_device structures,registering the
397 * stubs and initializing the AGP device.
398 *
399 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
400 * after the initialization for driver customization.
401 */
Dave Airlie8410ea32010-12-15 03:16:38 +1000402int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
Jordan Crousedcdb1672010-05-27 13:40:25 -0600403{
404 struct pci_dev *pdev = NULL;
405 const struct pci_device_id *pid;
406 int i;
407
Dave Airlie8410ea32010-12-15 03:16:38 +1000408 DRM_DEBUG("\n");
409
410 INIT_LIST_HEAD(&driver->device_list);
411 driver->kdriver.pci = pdriver;
412 driver->bus = &drm_pci_bus;
413
Jordan Crousedcdb1672010-05-27 13:40:25 -0600414 if (driver->driver_features & DRIVER_MODESET)
Dave Airlie8410ea32010-12-15 03:16:38 +1000415 return pci_register_driver(pdriver);
Jordan Crousedcdb1672010-05-27 13:40:25 -0600416
417 /* If not using KMS, fall back to stealth mode manual scanning. */
Dave Airlie8410ea32010-12-15 03:16:38 +1000418 for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
419 pid = &pdriver->id_table[i];
Jordan Crousedcdb1672010-05-27 13:40:25 -0600420
421 /* Loop around setting up a DRM device for each PCI device
422 * matching our ID and device class. If we had the internal
423 * function that pci_get_subsys and pci_get_class used, we'd
424 * be able to just pass pid in instead of doing a two-stage
425 * thing.
426 */
427 pdev = NULL;
428 while ((pdev =
429 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
430 pid->subdevice, pdev)) != NULL) {
431 if ((pdev->class & pid->class_mask) != pid->class)
432 continue;
433
434 /* stealth mode requires a manual probe */
435 pci_dev_get(pdev);
436 drm_get_pci_dev(pdev, pid, driver);
437 }
438 }
439 return 0;
440}
441
442#else
443
Dave Airlie8410ea32010-12-15 03:16:38 +1000444int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
Jordan Crousedcdb1672010-05-27 13:40:25 -0600445{
446 return -1;
447}
448
449#endif
Dave Airlie8410ea32010-12-15 03:16:38 +1000450
451EXPORT_SYMBOL(drm_pci_init);
452
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453/*@}*/
Dave Airlie8410ea32010-12-15 03:16:38 +1000454void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
455{
456 struct drm_device *dev, *tmp;
457 DRM_DEBUG("\n");
458
459 if (driver->driver_features & DRIVER_MODESET) {
460 pci_unregister_driver(pdriver);
461 } else {
462 list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
463 drm_put_dev(dev);
464 }
465 DRM_INFO("Module unloaded\n");
466}
467EXPORT_SYMBOL(drm_pci_exit);
Dave Airlief4297782012-06-27 08:35:53 +0100468
469int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
470{
471 struct pci_dev *root;
472 int pos;
473 u32 lnkcap, lnkcap2;
474
475 *mask = 0;
476 if (!dev->pdev)
477 return -EINVAL;
478
479 if (!pci_is_pcie(dev->pdev))
480 return -EINVAL;
481
482 root = dev->pdev->bus->self;
483
484 pos = pci_pcie_cap(root);
485 if (!pos)
486 return -EINVAL;
487
488 /* we've been informed via and serverworks don't make the cut */
489 if (root->vendor == PCI_VENDOR_ID_VIA ||
490 root->vendor == PCI_VENDOR_ID_SERVERWORKS)
491 return -EINVAL;
492
493 pci_read_config_dword(root, pos + PCI_EXP_LNKCAP, &lnkcap);
494 pci_read_config_dword(root, pos + PCI_EXP_LNKCAP2, &lnkcap2);
495
496 lnkcap &= PCI_EXP_LNKCAP_SLS;
497 lnkcap2 &= 0xfe;
498
499 if (lnkcap2) { /* PCIE GEN 3.0 */
500 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
501 *mask |= DRM_PCIE_SPEED_25;
502 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
503 *mask |= DRM_PCIE_SPEED_50;
504 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
505 *mask |= DRM_PCIE_SPEED_80;
506 } else {
507 if (lnkcap & 1)
508 *mask |= DRM_PCIE_SPEED_25;
509 if (lnkcap & 2)
510 *mask |= DRM_PCIE_SPEED_50;
511 }
512
513 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2);
514 return 0;
515}
516EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);