blob: 3ceea9cb9d3e42a36f2811b2bea31d63445e4e42 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Jan Engelhardt96de0e22007-10-19 23:21:04 +02002 * Copyright 2003 José Fonseca.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * 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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/slab.h>
Dave Airlie195b3a22006-04-05 18:12:18 +100027#include <linux/dma-mapping.h>
Paul Gortmaker2d1a8a42011-08-30 18:16:33 -040028#include <linux/export.h>
David Howells760285e2012-10-02 18:01:07 +010029#include <drm/drmP.h>
Ville Syrjälä43fc8842015-03-13 14:51:25 +020030#include "drm_internal.h"
Daniel Vetterba8286f2014-09-11 07:43:25 +020031#include "drm_legacy.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Linus Torvalds1da177e2005-04-16 15:20:36 -070033/**
Thierry Redingc6a1af8a2014-05-19 13:39:07 +020034 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA.
35 * @dev: DRM device
36 * @size: size of block to allocate
37 * @align: alignment of block
38 *
39 * Return: A handle to the allocated memory block on success or NULL on
40 * failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 */
Zhenyu Wange6be8d92010-01-05 11:25:05 +080042drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043{
Dave Airlie9c8da5e2005-07-10 15:38:56 +100044 drm_dma_handle_t *dmah;
Dave Airlieddf19b92006-03-19 18:56:12 +110045 unsigned long addr;
46 size_t sz;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48 /* pci_alloc_consistent only guarantees alignment to the smallest
49 * PAGE_SIZE order which is greater than or equal to the requested size.
50 * Return NULL here for now to make sure nobody tries for larger alignment
51 */
52 if (align > size)
53 return NULL;
54
Dave Airlie9c8da5e2005-07-10 15:38:56 +100055 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
56 if (!dmah)
57 return NULL;
Dave Airlieb5e89ed2005-09-25 14:28:13 +100058
Dave Airlie9c8da5e2005-07-10 15:38:56 +100059 dmah->size = size;
Dave Airlieddf19b92006-03-19 18:56:12 +110060 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Dave Airlie9c8da5e2005-07-10 15:38:56 +100062 if (dmah->vaddr == NULL) {
63 kfree(dmah);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 return NULL;
Dave Airlie9c8da5e2005-07-10 15:38:56 +100065 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Dave Airlie9c8da5e2005-07-10 15:38:56 +100067 memset(dmah->vaddr, 0, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Dave Airlieddf19b92006-03-19 18:56:12 +110069 /* XXX - Is virt_to_page() legal for consistent mem? */
70 /* Reserve */
71 for (addr = (unsigned long)dmah->vaddr, sz = size;
72 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
Ben Hutchingse1e78532013-10-27 21:52:39 +000073 SetPageReserved(virt_to_page((void *)addr));
Dave Airlieddf19b92006-03-19 18:56:12 +110074 }
75
Dave Airlie9c8da5e2005-07-10 15:38:56 +100076 return dmah;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
Dave Airlieb5e89ed2005-09-25 14:28:13 +100078
Linus Torvalds1da177e2005-04-16 15:20:36 -070079EXPORT_SYMBOL(drm_pci_alloc);
80
Thierry Redingc6a1af8a2014-05-19 13:39:07 +020081/*
82 * Free a PCI consistent memory block without freeing its descriptor.
Dave Airlie9c8da5e2005-07-10 15:38:56 +100083 *
84 * This function is for internal use in the Linux-specific DRM core code.
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 */
Daniel Vetter1c96e842014-09-10 12:43:51 +020086void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
Dave Airlieddf19b92006-03-19 18:56:12 +110088 unsigned long addr;
89 size_t sz;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Eric Anholt9a298b22009-03-24 12:23:04 -070091 if (dmah->vaddr) {
Dave Airlieddf19b92006-03-19 18:56:12 +110092 /* XXX - Is virt_to_page() legal for consistent mem? */
93 /* Unreserve */
94 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
95 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
Ben Hutchingse1e78532013-10-27 21:52:39 +000096 ClearPageReserved(virt_to_page((void *)addr));
Dave Airlieddf19b92006-03-19 18:56:12 +110097 }
98 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
99 dmah->busaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000102
103/**
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200104 * drm_pci_free - Free a PCI consistent memory block
105 * @dev: DRM device
106 * @dmah: handle to memory block
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000107 */
Dave Airlie84b1fd12007-07-11 15:53:27 +1000108void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000109{
Daniel Vetter1c96e842014-09-10 12:43:51 +0200110 __drm_legacy_pci_free(dev, dmah);
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000111 kfree(dmah);
112}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114EXPORT_SYMBOL(drm_pci_free);
115
Jordan Crousedcdb1672010-05-27 13:40:25 -0600116#ifdef CONFIG_PCI
Dave Airlie8410ea32010-12-15 03:16:38 +1000117
118static int drm_get_pci_domain(struct drm_device *dev)
119{
120#ifndef __alpha__
121 /* For historical reasons, drm_get_pci_domain() is busticated
122 * on most archs and has to remain so for userspace interface
123 * < 1.4, except on alpha which was right from the beginning
124 */
125 if (dev->if_version < 0x10004)
126 return 0;
127#endif /* __alpha__ */
128
129 return pci_domain_nr(dev->pdev->bus);
130}
131
David Herrmann915b4d12014-08-29 12:12:43 +0200132int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
Dave Airlie8410ea32010-12-15 03:16:38 +1000133{
David Herrmannd0a39162014-08-29 12:12:41 +0200134 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
135 drm_get_pci_domain(dev),
136 dev->pdev->bus->number,
137 PCI_SLOT(dev->pdev->devfn),
138 PCI_FUNC(dev->pdev->devfn));
139 if (!master->unique)
Dave Airlie8410ea32010-12-15 03:16:38 +1000140 return -ENOMEM;
141
David Herrmannd0a39162014-08-29 12:12:41 +0200142 master->unique_len = strlen(master->unique);
Dave Airlie8410ea32010-12-15 03:16:38 +1000143 return 0;
Dave Airlie8410ea32010-12-15 03:16:38 +1000144}
David Herrmann915b4d12014-08-29 12:12:43 +0200145EXPORT_SYMBOL(drm_pci_set_busid);
Dave Airlie8410ea32010-12-15 03:16:38 +1000146
Wolfram Sang45e97ab2011-06-15 11:26:47 +0200147static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
Dave Airlie8410ea32010-12-15 03:16:38 +1000148{
149 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
150 (p->busnum & 0xff) != dev->pdev->bus->number ||
151 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
152 return -EINVAL;
153
154 p->irq = dev->pdev->irq;
155
156 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
157 p->irq);
158 return 0;
159}
160
Daniel Vettereaaf8f02013-08-28 15:19:23 +0200161/**
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200162 * drm_irq_by_busid - Get interrupt from bus ID
163 * @dev: DRM device
164 * @data: IOCTL parameter pointing to a drm_irq_busid structure
165 * @file_priv: DRM file private.
Daniel Vettereaaf8f02013-08-28 15:19:23 +0200166 *
167 * Finds the PCI device with the specified bus id and gets its IRQ number.
168 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
169 * to that of the device that this DRM instance attached to.
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200170 *
171 * Return: 0 on success or a negative error code on failure.
Daniel Vettereaaf8f02013-08-28 15:19:23 +0200172 */
173int drm_irq_by_busid(struct drm_device *dev, void *data,
174 struct drm_file *file_priv)
175{
176 struct drm_irq_busid *p = data;
177
Daniel Vetterfa538642016-08-03 21:11:10 +0200178 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
Daniel Vettereaaf8f02013-08-28 15:19:23 +0200179 return -EINVAL;
180
181 /* UMS was only ever support on PCI devices. */
182 if (WARN_ON(!dev->pdev))
183 return -EINVAL;
184
185 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
186 return -EINVAL;
187
188 return drm_pci_irq_by_busid(dev, p);
189}
190
Daniel Vetter8da79cc2013-12-11 11:34:34 +0100191static void drm_pci_agp_init(struct drm_device *dev)
Dave Airlie8410ea32010-12-15 03:16:38 +1000192{
Daniel Vetterd9906752013-12-11 11:34:35 +0100193 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
Dave Airlie8410ea32010-12-15 03:16:38 +1000194 if (drm_pci_device_is_agp(dev))
195 dev->agp = drm_agp_init(dev);
Daniel Vetter28185642013-08-08 15:41:27 +0200196 if (dev->agp) {
197 dev->agp->agp_mtrr = arch_phys_wc_add(
198 dev->agp->agp_info.aper_base,
199 dev->agp->agp_info.aper_size *
200 1024 * 1024);
Dave Airlie8410ea32010-12-15 03:16:38 +1000201 }
202 }
Dave Airlie8410ea32010-12-15 03:16:38 +1000203}
204
Daniel Vetter4efafeb2013-12-11 11:34:38 +0100205void drm_pci_agp_destroy(struct drm_device *dev)
David Herrmann28ec7112013-07-27 16:37:00 +0200206{
Daniel Vetterd9906752013-12-11 11:34:35 +0100207 if (dev->agp) {
Daniel Vetter28185642013-08-08 15:41:27 +0200208 arch_phys_wc_del(dev->agp->agp_mtrr);
Daniel Vetter366884b2016-04-26 19:29:34 +0200209 drm_legacy_agp_clear(dev);
Daniel Vetterd6e4b28b2013-12-11 11:34:37 +0100210 kfree(dev->agp);
David Herrmann28ec7112013-07-27 16:37:00 +0200211 dev->agp = NULL;
212 }
213}
214
Jordan Crousedcdb1672010-05-27 13:40:25 -0600215/**
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200216 * drm_get_pci_dev - Register a PCI device with the DRM subsystem
217 * @pdev: PCI device
218 * @ent: entry from the PCI ID table that matches @pdev
219 * @driver: DRM device driver
Jordan Crousedcdb1672010-05-27 13:40:25 -0600220 *
221 * Attempt to gets inter module "drm" information. If we are first
222 * then register the character device and inter module information.
223 * Try and register, if we fail to register, backout previous work.
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200224 *
Daniel Vetter6e3f7972015-09-28 21:46:35 +0200225 * NOTE: This function is deprecated, please use drm_dev_alloc() and
226 * drm_dev_register() instead and remove your ->load() callback.
227 *
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200228 * Return: 0 on success or a negative error code on failure.
Jordan Crousedcdb1672010-05-27 13:40:25 -0600229 */
230int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
231 struct drm_driver *driver)
232{
233 struct drm_device *dev;
234 int ret;
235
236 DRM_DEBUG("\n");
237
David Herrmann1bb72532013-10-02 11:23:34 +0200238 dev = drm_dev_alloc(driver, &pdev->dev);
Tom Gundersen0f288602016-09-21 16:59:19 +0200239 if (IS_ERR(dev))
240 return PTR_ERR(dev);
Jordan Crousedcdb1672010-05-27 13:40:25 -0600241
242 ret = pci_enable_device(pdev);
243 if (ret)
David Herrmannc22f0ac2013-10-02 11:23:35 +0200244 goto err_free;
Jordan Crousedcdb1672010-05-27 13:40:25 -0600245
Jordan Crousedcdb1672010-05-27 13:40:25 -0600246 dev->pdev = pdev;
Jordan Crousedcdb1672010-05-27 13:40:25 -0600247#ifdef __alpha__
248 dev->hose = pdev->sysdata;
249#endif
250
David Herrmannc22f0ac2013-10-02 11:23:35 +0200251 if (drm_core_check_feature(dev, DRIVER_MODESET))
Jordan Crousedcdb1672010-05-27 13:40:25 -0600252 pci_set_drvdata(pdev, dev);
Jordan Crousedcdb1672010-05-27 13:40:25 -0600253
Daniel Vetter2c695fa2013-12-11 11:34:36 +0100254 drm_pci_agp_init(dev);
Daniel Vetter2c695fa2013-12-11 11:34:36 +0100255
David Herrmannc22f0ac2013-10-02 11:23:35 +0200256 ret = drm_dev_register(dev, ent->driver_data);
257 if (ret)
Daniel Vetter2c695fa2013-12-11 11:34:36 +0100258 goto err_agp;
Jordan Crousedcdb1672010-05-27 13:40:25 -0600259
260 DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
261 driver->name, driver->major, driver->minor, driver->patchlevel,
262 driver->date, pci_name(pdev), dev->primary->index);
263
Daniel Vetterb3f23332013-12-11 11:34:31 +0100264 /* No locking needed since shadow-attach is single-threaded since it may
265 * only be called from the per-driver module init hook. */
Daniel Vetterfa538642016-08-03 21:11:10 +0200266 if (drm_core_check_feature(dev, DRIVER_LEGACY))
Daniel Vetterb3f23332013-12-11 11:34:31 +0100267 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
268
Jordan Crousedcdb1672010-05-27 13:40:25 -0600269 return 0;
270
Daniel Vetter2c695fa2013-12-11 11:34:36 +0100271err_agp:
Daniel Vetter2c695fa2013-12-11 11:34:36 +0100272 drm_pci_agp_destroy(dev);
Jordan Crousedcdb1672010-05-27 13:40:25 -0600273 pci_disable_device(pdev);
David Herrmannc22f0ac2013-10-02 11:23:35 +0200274err_free:
David Herrmann099d1c22014-01-29 10:21:36 +0100275 drm_dev_unref(dev);
Jordan Crousedcdb1672010-05-27 13:40:25 -0600276 return ret;
277}
278EXPORT_SYMBOL(drm_get_pci_dev);
279
280/**
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200281 * drm_pci_init - Register matching PCI devices with the DRM subsystem
282 * @driver: DRM device driver
283 * @pdriver: PCI device driver
Jordan Crousedcdb1672010-05-27 13:40:25 -0600284 *
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200285 * Initializes a drm_device structures, registering the stubs and initializing
286 * the AGP device.
Jordan Crousedcdb1672010-05-27 13:40:25 -0600287 *
Daniel Vetter6e3f7972015-09-28 21:46:35 +0200288 * NOTE: This function is deprecated. Modern modesetting drm drivers should use
289 * pci_register_driver() directly, this function only provides shadow-binding
290 * support for old legacy drivers on top of that core pci function.
291 *
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200292 * Return: 0 on success or a negative error code on failure.
Jordan Crousedcdb1672010-05-27 13:40:25 -0600293 */
Dave Airlie8410ea32010-12-15 03:16:38 +1000294int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
Jordan Crousedcdb1672010-05-27 13:40:25 -0600295{
296 struct pci_dev *pdev = NULL;
297 const struct pci_device_id *pid;
298 int i;
299
Dave Airlie8410ea32010-12-15 03:16:38 +1000300 DRM_DEBUG("\n");
301
Daniel Vetterfa538642016-08-03 21:11:10 +0200302 if (!(driver->driver_features & DRIVER_LEGACY))
Dave Airlie8410ea32010-12-15 03:16:38 +1000303 return pci_register_driver(pdriver);
Jordan Crousedcdb1672010-05-27 13:40:25 -0600304
305 /* If not using KMS, fall back to stealth mode manual scanning. */
Daniel Vetterb3f23332013-12-11 11:34:31 +0100306 INIT_LIST_HEAD(&driver->legacy_dev_list);
Dave Airlie8410ea32010-12-15 03:16:38 +1000307 for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
308 pid = &pdriver->id_table[i];
Jordan Crousedcdb1672010-05-27 13:40:25 -0600309
310 /* Loop around setting up a DRM device for each PCI device
311 * matching our ID and device class. If we had the internal
312 * function that pci_get_subsys and pci_get_class used, we'd
313 * be able to just pass pid in instead of doing a two-stage
314 * thing.
315 */
316 pdev = NULL;
317 while ((pdev =
318 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
319 pid->subdevice, pdev)) != NULL) {
320 if ((pdev->class & pid->class_mask) != pid->class)
321 continue;
322
323 /* stealth mode requires a manual probe */
324 pci_dev_get(pdev);
325 drm_get_pci_dev(pdev, pid, driver);
326 }
327 }
328 return 0;
329}
330
Dave Airlief4297782012-06-27 08:35:53 +0100331int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
332{
333 struct pci_dev *root;
Bjorn Helgaasdd66cc22013-01-04 19:10:42 +0000334 u32 lnkcap, lnkcap2;
Dave Airlief4297782012-06-27 08:35:53 +0100335
336 *mask = 0;
337 if (!dev->pdev)
338 return -EINVAL;
339
Dave Airlief4297782012-06-27 08:35:53 +0100340 root = dev->pdev->bus->self;
341
Dave Airlief4297782012-06-27 08:35:53 +0100342 /* we've been informed via and serverworks don't make the cut */
343 if (root->vendor == PCI_VENDOR_ID_VIA ||
344 root->vendor == PCI_VENDOR_ID_SERVERWORKS)
345 return -EINVAL;
346
Bjorn Helgaasdd66cc22013-01-04 19:10:42 +0000347 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
348 pcie_capability_read_dword(root, PCI_EXP_LNKCAP2, &lnkcap2);
Dave Airlief4297782012-06-27 08:35:53 +0100349
Bjorn Helgaasdd66cc22013-01-04 19:10:42 +0000350 if (lnkcap2) { /* PCIe r3.0-compliant */
Dave Airlief4297782012-06-27 08:35:53 +0100351 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
352 *mask |= DRM_PCIE_SPEED_25;
353 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
354 *mask |= DRM_PCIE_SPEED_50;
355 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
356 *mask |= DRM_PCIE_SPEED_80;
Bjorn Helgaasdd66cc22013-01-04 19:10:42 +0000357 } else { /* pre-r3.0 */
Bjorn Helgaas9fe04232013-01-04 19:10:32 +0000358 if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB)
Dave Airlief4297782012-06-27 08:35:53 +0100359 *mask |= DRM_PCIE_SPEED_25;
Bjorn Helgaas9fe04232013-01-04 19:10:32 +0000360 if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB)
Bjorn Helgaasf8acf6f2013-01-04 19:10:37 +0000361 *mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50);
Dave Airlief4297782012-06-27 08:35:53 +0100362 }
363
364 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2);
365 return 0;
366}
367EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
Bjorn Helgaas93711d82013-02-08 15:27:01 -0700368
Alex Deucher60d8edd2015-11-11 23:14:39 -0500369int drm_pcie_get_max_link_width(struct drm_device *dev, u32 *mlw)
370{
371 struct pci_dev *root;
372 u32 lnkcap;
373
374 *mlw = 0;
375 if (!dev->pdev)
376 return -EINVAL;
377
378 root = dev->pdev->bus->self;
379
380 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
381
382 *mlw = (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4;
383
384 DRM_INFO("probing mlw for device %x:%x = %x\n", root->vendor, root->device, lnkcap);
385 return 0;
386}
387EXPORT_SYMBOL(drm_pcie_get_max_link_width);
388
Bjorn Helgaas93711d82013-02-08 15:27:01 -0700389#else
390
391int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
392{
393 return -1;
394}
395
Daniel Vetter4efafeb2013-12-11 11:34:38 +0100396void drm_pci_agp_destroy(struct drm_device *dev) {}
Daniel Vettereaaf8f02013-08-28 15:19:23 +0200397
398int drm_irq_by_busid(struct drm_device *dev, void *data,
399 struct drm_file *file_priv)
400{
401 return -EINVAL;
402}
Bjorn Helgaas93711d82013-02-08 15:27:01 -0700403#endif
404
405EXPORT_SYMBOL(drm_pci_init);
406
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200407/**
408 * drm_pci_exit - Unregister matching PCI devices from the DRM subsystem
409 * @driver: DRM device driver
410 * @pdriver: PCI device driver
411 *
412 * Unregisters one or more devices matched by a PCI driver from the DRM
413 * subsystem.
Daniel Vetter6e3f7972015-09-28 21:46:35 +0200414 *
415 * NOTE: This function is deprecated. Modern modesetting drm drivers should use
416 * pci_unregister_driver() directly, this function only provides shadow-binding
417 * support for old legacy drivers on top of that core pci function.
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200418 */
Bjorn Helgaas93711d82013-02-08 15:27:01 -0700419void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
420{
421 struct drm_device *dev, *tmp;
422 DRM_DEBUG("\n");
423
Daniel Vetterfa538642016-08-03 21:11:10 +0200424 if (!(driver->driver_features & DRIVER_LEGACY)) {
Bjorn Helgaas93711d82013-02-08 15:27:01 -0700425 pci_unregister_driver(pdriver);
426 } else {
Daniel Vetterb3f23332013-12-11 11:34:31 +0100427 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
428 legacy_dev_list) {
Daniel Vetterb3f23332013-12-11 11:34:31 +0100429 list_del(&dev->legacy_dev_list);
Daniel Vetterc94adc42014-01-30 17:58:38 +0100430 drm_put_dev(dev);
Daniel Vetterb3f23332013-12-11 11:34:31 +0100431 }
Bjorn Helgaas93711d82013-02-08 15:27:01 -0700432 }
433 DRM_INFO("Module unloaded\n");
434}
435EXPORT_SYMBOL(drm_pci_exit);