blob: 92618686604cb9d314aa1e6bf833363cfbaaa1b5 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/pci/pci-sysfs.c
3 *
4 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
5 * (C) Copyright 2002-2004 IBM Corp.
6 * (C) Copyright 2003 Matthew Wilcox
7 * (C) Copyright 2003 Hewlett-Packard
8 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
9 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
10 *
11 * File attributes for PCI devices
12 *
Bjorn Helgaasf7625982013-11-14 11:28:18 -070013 * Modeled after usb's driverfs.c
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 *
15 */
16
17
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/kernel.h>
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -070019#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/pci.h>
21#include <linux/stat.h>
Paul Gortmaker363c75d2011-05-27 09:37:25 -040022#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/topology.h>
24#include <linux/mm.h>
Chris Wrightde139a32010-05-13 10:43:07 -070025#include <linux/fs.h>
Alexey Dobriyanaa0ac362007-07-15 23:40:39 -070026#include <linux/capability.h>
Chris Wrighta628e7b2011-02-14 17:21:49 -080027#include <linux/security.h>
Shaohua Li7d715a62008-02-25 09:46:41 +080028#include <linux/pci-aspm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090029#include <linux/slab.h>
Matthew Garrett1a39b312012-04-16 16:26:02 -040030#include <linux/vgaarb.h>
Huang Ying448bd852012-06-23 10:23:51 +080031#include <linux/pm_runtime.h>
Sebastian Ottdfc73e72014-04-17 19:46:15 +020032#include <linux/of.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "pci.h"
34
35static int sysfs_initialized; /* = 0 */
36
37/* show configuration fields */
38#define pci_config_attr(field, format_string) \
39static ssize_t \
Yani Ioannoue404e272005-05-17 06:42:58 -040040field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{ \
42 struct pci_dev *pdev; \
43 \
Ryan Desfosses3c78bc62014-04-18 20:13:49 -040044 pdev = to_pci_dev(dev); \
45 return sprintf(buf, format_string, pdev->field); \
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -070046} \
47static DEVICE_ATTR_RO(field)
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49pci_config_attr(vendor, "0x%04x\n");
50pci_config_attr(device, "0x%04x\n");
51pci_config_attr(subsystem_vendor, "0x%04x\n");
52pci_config_attr(subsystem_device, "0x%04x\n");
53pci_config_attr(class, "0x%06x\n");
54pci_config_attr(irq, "%u\n");
55
Doug Thompsonbdee9d92006-06-14 16:59:48 -070056static ssize_t broken_parity_status_show(struct device *dev,
57 struct device_attribute *attr,
58 char *buf)
59{
60 struct pci_dev *pdev = to_pci_dev(dev);
Ryan Desfosses3c78bc62014-04-18 20:13:49 -040061 return sprintf(buf, "%u\n", pdev->broken_parity_status);
Doug Thompsonbdee9d92006-06-14 16:59:48 -070062}
63
64static ssize_t broken_parity_status_store(struct device *dev,
65 struct device_attribute *attr,
66 const char *buf, size_t count)
67{
68 struct pci_dev *pdev = to_pci_dev(dev);
Trent Piepho92425a42008-11-30 17:10:12 -080069 unsigned long val;
Doug Thompsonbdee9d92006-06-14 16:59:48 -070070
Jingoo Han9a994e82013-06-01 16:25:25 +090071 if (kstrtoul(buf, 0, &val) < 0)
Trent Piepho92425a42008-11-30 17:10:12 -080072 return -EINVAL;
73
74 pdev->broken_parity_status = !!val;
75
76 return count;
Doug Thompsonbdee9d92006-06-14 16:59:48 -070077}
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -070078static DEVICE_ATTR_RW(broken_parity_status);
Doug Thompsonbdee9d92006-06-14 16:59:48 -070079
Sudeep Holla5aaba362014-09-30 14:48:22 +010080static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -040081 struct device_attribute *attr, char *buf)
Mike Travis39106dc2008-04-08 11:43:03 -070082{
Mike Travis3be83052009-01-04 05:18:01 -080083 const struct cpumask *mask;
Mike Travis39106dc2008-04-08 11:43:03 -070084
Andreas Herrmanne0cd5162009-04-17 12:01:55 +020085#ifdef CONFIG_NUMA
David John6be954d2010-01-04 20:28:57 +053086 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
87 cpumask_of_node(dev_to_node(dev));
Andreas Herrmanne0cd5162009-04-17 12:01:55 +020088#else
Mike Travis3be83052009-01-04 05:18:01 -080089 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
Andreas Herrmanne0cd5162009-04-17 12:01:55 +020090#endif
Sudeep Holla5aaba362014-09-30 14:48:22 +010091 return cpumap_print_to_pagebuf(list, buf, mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092}
93
Yijing Wangc489f5f2013-09-30 15:02:38 +080094static ssize_t local_cpus_show(struct device *dev,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -040095 struct device_attribute *attr, char *buf)
Yijing Wangc489f5f2013-09-30 15:02:38 +080096{
Sudeep Holla5aaba362014-09-30 14:48:22 +010097 return pci_dev_show_local_cpu(dev, false, attr, buf);
Yijing Wangc489f5f2013-09-30 15:02:38 +080098}
Bjorn Helgaas33de1b82013-10-31 14:12:40 -060099static DEVICE_ATTR_RO(local_cpus);
Yijing Wangc489f5f2013-09-30 15:02:38 +0800100
101static ssize_t local_cpulist_show(struct device *dev,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400102 struct device_attribute *attr, char *buf)
Yijing Wangc489f5f2013-09-30 15:02:38 +0800103{
Sudeep Holla5aaba362014-09-30 14:48:22 +0100104 return pci_dev_show_local_cpu(dev, true, attr, buf);
Yijing Wangc489f5f2013-09-30 15:02:38 +0800105}
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700106static DEVICE_ATTR_RO(local_cpulist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
Yinghai Ludc2c2c92011-05-12 17:11:40 -0700108/*
109 * PCI Bus Class Devices
110 */
Greg Kroah-Hartman56039e62013-07-24 15:05:17 -0700111static ssize_t cpuaffinity_show(struct device *dev,
112 struct device_attribute *attr, char *buf)
Yinghai Ludc2c2c92011-05-12 17:11:40 -0700113{
Sudeep Holla5aaba362014-09-30 14:48:22 +0100114 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
115
116 return cpumap_print_to_pagebuf(false, buf, cpumask);
Yinghai Ludc2c2c92011-05-12 17:11:40 -0700117}
Greg Kroah-Hartman56039e62013-07-24 15:05:17 -0700118static DEVICE_ATTR_RO(cpuaffinity);
Yinghai Ludc2c2c92011-05-12 17:11:40 -0700119
Greg Kroah-Hartman56039e62013-07-24 15:05:17 -0700120static ssize_t cpulistaffinity_show(struct device *dev,
121 struct device_attribute *attr, char *buf)
Yinghai Ludc2c2c92011-05-12 17:11:40 -0700122{
Sudeep Holla5aaba362014-09-30 14:48:22 +0100123 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
124
125 return cpumap_print_to_pagebuf(true, buf, cpumask);
Yinghai Ludc2c2c92011-05-12 17:11:40 -0700126}
Greg Kroah-Hartman56039e62013-07-24 15:05:17 -0700127static DEVICE_ATTR_RO(cpulistaffinity);
Yinghai Ludc2c2c92011-05-12 17:11:40 -0700128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129/* show resources */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400130static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
131 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400133 struct pci_dev *pci_dev = to_pci_dev(dev);
134 char *str = buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 int i;
Yu Zhaofde09c62008-11-22 02:39:32 +0800136 int max;
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700137 resource_size_t start, end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139 if (pci_dev->subordinate)
140 max = DEVICE_COUNT_RESOURCE;
Yu Zhaofde09c62008-11-22 02:39:32 +0800141 else
142 max = PCI_BRIDGE_RESOURCES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
144 for (i = 0; i < max; i++) {
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000145 struct resource *res = &pci_dev->resource[i];
146 pci_resource_to_user(pci_dev, i, res, &start, &end);
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400147 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000148 (unsigned long long)start,
149 (unsigned long long)end,
150 (unsigned long long)res->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 }
152 return (str - buf);
153}
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700154static DEVICE_ATTR_RO(resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400156static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
157 char *buf)
Greg KH98885492005-05-05 11:57:25 -0700158{
159 struct pci_dev *pci_dev = to_pci_dev(dev);
160
Ricardo Ribalda Delgado89ec3dc2014-08-27 14:57:57 +0200161 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
Greg KH98885492005-05-05 11:57:25 -0700162 pci_dev->vendor, pci_dev->device,
163 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
164 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
165 (u8)(pci_dev->class));
166}
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700167static DEVICE_ATTR_RO(modalias);
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800168
Greg Kroah-Hartmand8e7d532014-10-30 09:30:28 -0700169static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400170 const char *buf, size_t count)
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200171{
172 struct pci_dev *pdev = to_pci_dev(dev);
Trent Piepho92425a42008-11-30 17:10:12 -0800173 unsigned long val;
Jingoo Han9a994e82013-06-01 16:25:25 +0900174 ssize_t result = kstrtoul(buf, 0, &val);
Trent Piepho92425a42008-11-30 17:10:12 -0800175
176 if (result < 0)
177 return result;
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200178
179 /* this can crash the machine when done on the "wrong" device */
180 if (!capable(CAP_SYS_ADMIN))
Trent Piepho92425a42008-11-30 17:10:12 -0800181 return -EPERM;
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200182
Trent Piepho92425a42008-11-30 17:10:12 -0800183 if (!val) {
Yuji Shimada296ccb02009-04-03 16:41:46 +0900184 if (pci_is_enabled(pdev))
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800185 pci_disable_device(pdev);
186 else
187 result = -EIO;
Trent Piepho92425a42008-11-30 17:10:12 -0800188 } else
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800189 result = pci_enable_device(pdev);
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200190
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800191 return result < 0 ? result : count;
192}
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200193
Greg Kroah-Hartmand8e7d532014-10-30 09:30:28 -0700194static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400195 char *buf)
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800196{
197 struct pci_dev *pdev;
198
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400199 pdev = to_pci_dev(dev);
200 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200201}
Greg Kroah-Hartmand8e7d532014-10-30 09:30:28 -0700202static DEVICE_ATTR_RW(enable);
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200203
Brice Goglin81bb0e12007-01-28 10:53:40 +0100204#ifdef CONFIG_NUMA
Prarit Bhargava63692df2014-10-23 14:22:12 -0400205static ssize_t numa_node_store(struct device *dev,
206 struct device_attribute *attr, const char *buf,
207 size_t count)
208{
209 struct pci_dev *pdev = to_pci_dev(dev);
210 int node, ret;
211
212 if (!capable(CAP_SYS_ADMIN))
213 return -EPERM;
214
215 ret = kstrtoint(buf, 0, &node);
216 if (ret)
217 return ret;
218
Sasha Levin12669632015-10-07 11:03:28 -0500219 if (node >= MAX_NUMNODES || !node_online(node))
Prarit Bhargava63692df2014-10-23 14:22:12 -0400220 return -EINVAL;
221
222 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
223 dev_alert(&pdev->dev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
224 node);
225
226 dev->numa_node = node;
227 return count;
228}
229
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400230static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
231 char *buf)
Brice Goglin81bb0e12007-01-28 10:53:40 +0100232{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400233 return sprintf(buf, "%d\n", dev->numa_node);
Brice Goglin81bb0e12007-01-28 10:53:40 +0100234}
Prarit Bhargava63692df2014-10-23 14:22:12 -0400235static DEVICE_ATTR_RW(numa_node);
Brice Goglin81bb0e12007-01-28 10:53:40 +0100236#endif
237
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400238static ssize_t dma_mask_bits_show(struct device *dev,
239 struct device_attribute *attr, char *buf)
Yinghai Lubb965402009-11-24 18:21:21 -0800240{
241 struct pci_dev *pdev = to_pci_dev(dev);
242
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400243 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
Yinghai Lubb965402009-11-24 18:21:21 -0800244}
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700245static DEVICE_ATTR_RO(dma_mask_bits);
Yinghai Lubb965402009-11-24 18:21:21 -0800246
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400247static ssize_t consistent_dma_mask_bits_show(struct device *dev,
248 struct device_attribute *attr,
249 char *buf)
Yinghai Lubb965402009-11-24 18:21:21 -0800250{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400251 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
Yinghai Lubb965402009-11-24 18:21:21 -0800252}
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700253static DEVICE_ATTR_RO(consistent_dma_mask_bits);
Yinghai Lubb965402009-11-24 18:21:21 -0800254
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400255static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
256 char *buf)
Brice Goglinfe970642006-08-31 01:55:15 -0400257{
258 struct pci_dev *pdev = to_pci_dev(dev);
Yijing Wang468ff152014-09-23 13:27:24 +0800259 struct pci_bus *subordinate = pdev->subordinate;
Brice Goglinfe970642006-08-31 01:55:15 -0400260
Yijing Wang468ff152014-09-23 13:27:24 +0800261 return sprintf(buf, "%u\n", subordinate ?
262 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
263 : !pdev->no_msi);
Brice Goglinfe970642006-08-31 01:55:15 -0400264}
265
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400266static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
267 const char *buf, size_t count)
Brice Goglinfe970642006-08-31 01:55:15 -0400268{
269 struct pci_dev *pdev = to_pci_dev(dev);
Yijing Wang468ff152014-09-23 13:27:24 +0800270 struct pci_bus *subordinate = pdev->subordinate;
Trent Piepho92425a42008-11-30 17:10:12 -0800271 unsigned long val;
272
Jingoo Han9a994e82013-06-01 16:25:25 +0900273 if (kstrtoul(buf, 0, &val) < 0)
Trent Piepho92425a42008-11-30 17:10:12 -0800274 return -EINVAL;
Brice Goglinfe970642006-08-31 01:55:15 -0400275
Brice Goglinfe970642006-08-31 01:55:15 -0400276 if (!capable(CAP_SYS_ADMIN))
Trent Piepho92425a42008-11-30 17:10:12 -0800277 return -EPERM;
Brice Goglinfe970642006-08-31 01:55:15 -0400278
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700279 /*
Yijing Wang468ff152014-09-23 13:27:24 +0800280 * "no_msi" and "bus_flags" only affect what happens when a driver
281 * requests MSI or MSI-X. They don't affect any drivers that have
282 * already requested MSI or MSI-X.
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700283 */
Yijing Wang468ff152014-09-23 13:27:24 +0800284 if (!subordinate) {
285 pdev->no_msi = !val;
286 dev_info(&pdev->dev, "MSI/MSI-X %s for future drivers\n",
287 val ? "allowed" : "disallowed");
Brice Goglinfe970642006-08-31 01:55:15 -0400288 return count;
Brice Goglinfe970642006-08-31 01:55:15 -0400289 }
290
Yijing Wang468ff152014-09-23 13:27:24 +0800291 if (val)
292 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
293 else
294 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
295
296 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
297 val ? "allowed" : "disallowed");
Brice Goglinfe970642006-08-31 01:55:15 -0400298 return count;
299}
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700300static DEVICE_ATTR_RW(msi_bus);
Greg KH98885492005-05-05 11:57:25 -0700301
Alex Chiang705b1aa2009-03-20 14:56:31 -0600302static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
303 size_t count)
304{
305 unsigned long val;
306 struct pci_bus *b = NULL;
307
Jingoo Han9a994e82013-06-01 16:25:25 +0900308 if (kstrtoul(buf, 0, &val) < 0)
Alex Chiang705b1aa2009-03-20 14:56:31 -0600309 return -EINVAL;
310
311 if (val) {
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100312 pci_lock_rescan_remove();
Alex Chiang705b1aa2009-03-20 14:56:31 -0600313 while ((b = pci_find_next_bus(b)) != NULL)
314 pci_rescan_bus(b);
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100315 pci_unlock_rescan_remove();
Alex Chiang705b1aa2009-03-20 14:56:31 -0600316 }
317 return count;
318}
Greg Kroah-Hartman0f49ba52013-10-07 14:51:02 -0600319static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
Alex Chiang705b1aa2009-03-20 14:56:31 -0600320
Sachin Kamatbf22c902013-09-28 15:42:00 +0530321static struct attribute *pci_bus_attrs[] = {
Greg Kroah-Hartman0f49ba52013-10-07 14:51:02 -0600322 &bus_attr_rescan.attr,
323 NULL,
324};
325
326static const struct attribute_group pci_bus_group = {
327 .attrs = pci_bus_attrs,
328};
329
330const struct attribute_group *pci_bus_groups[] = {
331 &pci_bus_group,
332 NULL,
Alex Chiang705b1aa2009-03-20 14:56:31 -0600333};
Alex Chiang77c27c72009-03-20 14:56:36 -0600334
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400335static ssize_t dev_rescan_store(struct device *dev,
336 struct device_attribute *attr, const char *buf,
337 size_t count)
Alex Chiang738a6392009-03-20 14:56:41 -0600338{
339 unsigned long val;
340 struct pci_dev *pdev = to_pci_dev(dev);
341
Jingoo Han9a994e82013-06-01 16:25:25 +0900342 if (kstrtoul(buf, 0, &val) < 0)
Alex Chiang738a6392009-03-20 14:56:41 -0600343 return -EINVAL;
344
345 if (val) {
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100346 pci_lock_rescan_remove();
Alex Chiang738a6392009-03-20 14:56:41 -0600347 pci_rescan_bus(pdev->bus);
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100348 pci_unlock_rescan_remove();
Alex Chiang738a6392009-03-20 14:56:41 -0600349 }
350 return count;
351}
Sachin Kamatbf22c902013-09-28 15:42:00 +0530352static struct device_attribute dev_rescan_attr = __ATTR(rescan,
353 (S_IWUSR|S_IWGRP),
354 NULL, dev_rescan_store);
Alex Chiang738a6392009-03-20 14:56:41 -0600355
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400356static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
357 const char *buf, size_t count)
Alex Chiang77c27c72009-03-20 14:56:36 -0600358{
Alex Chiang77c27c72009-03-20 14:56:36 -0600359 unsigned long val;
Alex Chiang77c27c72009-03-20 14:56:36 -0600360
Jingoo Han9a994e82013-06-01 16:25:25 +0900361 if (kstrtoul(buf, 0, &val) < 0)
Alex Chiang77c27c72009-03-20 14:56:36 -0600362 return -EINVAL;
363
Tejun Heobc6caf02014-02-03 14:03:02 -0500364 if (val && device_remove_file_self(dev, attr))
365 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
Alex Chiang77c27c72009-03-20 14:56:36 -0600366 return count;
367}
Sachin Kamatbf22c902013-09-28 15:42:00 +0530368static struct device_attribute dev_remove_attr = __ATTR(remove,
369 (S_IWUSR|S_IWGRP),
370 NULL, remove_store);
Yinghai Lub9d320f2011-05-12 17:11:39 -0700371
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400372static ssize_t dev_bus_rescan_store(struct device *dev,
373 struct device_attribute *attr,
374 const char *buf, size_t count)
Yinghai Lub9d320f2011-05-12 17:11:39 -0700375{
376 unsigned long val;
377 struct pci_bus *bus = to_pci_bus(dev);
378
Jingoo Han9a994e82013-06-01 16:25:25 +0900379 if (kstrtoul(buf, 0, &val) < 0)
Yinghai Lub9d320f2011-05-12 17:11:39 -0700380 return -EINVAL;
381
382 if (val) {
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100383 pci_lock_rescan_remove();
Yinghai Lu2f320522012-01-21 02:08:22 -0800384 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
385 pci_rescan_bus_bridge_resize(bus->self);
386 else
387 pci_rescan_bus(bus);
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100388 pci_unlock_rescan_remove();
Yinghai Lub9d320f2011-05-12 17:11:39 -0700389 }
390 return count;
391}
Greg Kroah-Hartman56039e62013-07-24 15:05:17 -0700392static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
Yinghai Lub9d320f2011-05-12 17:11:39 -0700393
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +0100394#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
Huang Ying448bd852012-06-23 10:23:51 +0800395static ssize_t d3cold_allowed_store(struct device *dev,
396 struct device_attribute *attr,
397 const char *buf, size_t count)
398{
399 struct pci_dev *pdev = to_pci_dev(dev);
400 unsigned long val;
401
Jingoo Han9a994e82013-06-01 16:25:25 +0900402 if (kstrtoul(buf, 0, &val) < 0)
Huang Ying448bd852012-06-23 10:23:51 +0800403 return -EINVAL;
404
405 pdev->d3cold_allowed = !!val;
406 pm_runtime_resume(dev);
407
408 return count;
409}
410
411static ssize_t d3cold_allowed_show(struct device *dev,
412 struct device_attribute *attr, char *buf)
413{
414 struct pci_dev *pdev = to_pci_dev(dev);
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400415 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
Huang Ying448bd852012-06-23 10:23:51 +0800416}
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700417static DEVICE_ATTR_RW(d3cold_allowed);
Huang Ying448bd852012-06-23 10:23:51 +0800418#endif
419
Sebastian Ottdfc73e72014-04-17 19:46:15 +0200420#ifdef CONFIG_OF
421static ssize_t devspec_show(struct device *dev,
422 struct device_attribute *attr, char *buf)
423{
424 struct pci_dev *pdev = to_pci_dev(dev);
425 struct device_node *np = pci_device_to_OF_node(pdev);
426
427 if (np == NULL || np->full_name == NULL)
428 return 0;
429 return sprintf(buf, "%s", np->full_name);
430}
431static DEVICE_ATTR_RO(devspec);
432#endif
433
Donald Dutile17893822012-11-05 15:20:36 -0500434#ifdef CONFIG_PCI_IOV
435static ssize_t sriov_totalvfs_show(struct device *dev,
436 struct device_attribute *attr,
437 char *buf)
438{
439 struct pci_dev *pdev = to_pci_dev(dev);
440
Donald Dutilebff73152012-11-05 15:20:37 -0500441 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
Donald Dutile17893822012-11-05 15:20:36 -0500442}
443
444
445static ssize_t sriov_numvfs_show(struct device *dev,
446 struct device_attribute *attr,
447 char *buf)
448{
449 struct pci_dev *pdev = to_pci_dev(dev);
450
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700451 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
Donald Dutile17893822012-11-05 15:20:36 -0500452}
453
454/*
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700455 * num_vfs > 0; number of VFs to enable
456 * num_vfs = 0; disable all VFs
Donald Dutile17893822012-11-05 15:20:36 -0500457 *
458 * Note: SRIOV spec doesn't allow partial VF
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700459 * disable, so it's all or none.
Donald Dutile17893822012-11-05 15:20:36 -0500460 */
461static ssize_t sriov_numvfs_store(struct device *dev,
462 struct device_attribute *attr,
463 const char *buf, size_t count)
464{
465 struct pci_dev *pdev = to_pci_dev(dev);
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700466 int ret;
467 u16 num_vfs;
Donald Dutile17893822012-11-05 15:20:36 -0500468
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700469 ret = kstrtou16(buf, 0, &num_vfs);
470 if (ret < 0)
471 return ret;
472
473 if (num_vfs > pci_sriov_get_totalvfs(pdev))
474 return -ERANGE;
475
476 if (num_vfs == pdev->sriov->num_VFs)
477 return count; /* no change */
Donald Dutile17893822012-11-05 15:20:36 -0500478
479 /* is PF driver loaded w/callback */
480 if (!pdev->driver || !pdev->driver->sriov_configure) {
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700481 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
Donald Dutile17893822012-11-05 15:20:36 -0500482 return -ENOSYS;
483 }
484
Donald Dutile17893822012-11-05 15:20:36 -0500485 if (num_vfs == 0) {
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700486 /* disable VFs */
487 ret = pdev->driver->sriov_configure(pdev, 0);
488 if (ret < 0)
489 return ret;
490 return count;
Donald Dutile17893822012-11-05 15:20:36 -0500491 }
492
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700493 /* enable VFs */
494 if (pdev->sriov->num_VFs) {
495 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
496 pdev->sriov->num_VFs, num_vfs);
497 return -EBUSY;
498 }
Donald Dutile17893822012-11-05 15:20:36 -0500499
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700500 ret = pdev->driver->sriov_configure(pdev, num_vfs);
501 if (ret < 0)
502 return ret;
503
504 if (ret != num_vfs)
505 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
506 num_vfs, ret);
507
508 return count;
Donald Dutile17893822012-11-05 15:20:36 -0500509}
510
511static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
512static struct device_attribute sriov_numvfs_attr =
513 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
514 sriov_numvfs_show, sriov_numvfs_store);
515#endif /* CONFIG_PCI_IOV */
516
Alex Williamson782a9852014-05-20 08:53:21 -0600517static ssize_t driver_override_store(struct device *dev,
518 struct device_attribute *attr,
519 const char *buf, size_t count)
520{
521 struct pci_dev *pdev = to_pci_dev(dev);
522 char *driver_override, *old = pdev->driver_override, *cp;
523
Sasha Levin4efe8742015-02-04 17:38:15 -0500524 /* We need to keep extra room for a newline */
525 if (count >= (PAGE_SIZE - 1))
Alex Williamson782a9852014-05-20 08:53:21 -0600526 return -EINVAL;
527
528 driver_override = kstrndup(buf, count, GFP_KERNEL);
529 if (!driver_override)
530 return -ENOMEM;
531
532 cp = strchr(driver_override, '\n');
533 if (cp)
534 *cp = '\0';
535
536 if (strlen(driver_override)) {
537 pdev->driver_override = driver_override;
538 } else {
539 kfree(driver_override);
540 pdev->driver_override = NULL;
541 }
542
543 kfree(old);
544
545 return count;
546}
547
548static ssize_t driver_override_show(struct device *dev,
549 struct device_attribute *attr, char *buf)
550{
551 struct pci_dev *pdev = to_pci_dev(dev);
552
Sasha Levin4efe8742015-02-04 17:38:15 -0500553 return snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
Alex Williamson782a9852014-05-20 08:53:21 -0600554}
555static DEVICE_ATTR_RW(driver_override);
556
Sachin Kamatbf22c902013-09-28 15:42:00 +0530557static struct attribute *pci_dev_attrs[] = {
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700558 &dev_attr_resource.attr,
559 &dev_attr_vendor.attr,
560 &dev_attr_device.attr,
561 &dev_attr_subsystem_vendor.attr,
562 &dev_attr_subsystem_device.attr,
563 &dev_attr_class.attr,
564 &dev_attr_irq.attr,
565 &dev_attr_local_cpus.attr,
566 &dev_attr_local_cpulist.attr,
567 &dev_attr_modalias.attr,
Brice Goglin81bb0e12007-01-28 10:53:40 +0100568#ifdef CONFIG_NUMA
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700569 &dev_attr_numa_node.attr,
Brice Goglin81bb0e12007-01-28 10:53:40 +0100570#endif
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700571 &dev_attr_dma_mask_bits.attr,
572 &dev_attr_consistent_dma_mask_bits.attr,
Greg Kroah-Hartmand8e7d532014-10-30 09:30:28 -0700573 &dev_attr_enable.attr,
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700574 &dev_attr_broken_parity_status.attr,
575 &dev_attr_msi_bus.attr,
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +0100576#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700577 &dev_attr_d3cold_allowed.attr,
Huang Ying448bd852012-06-23 10:23:51 +0800578#endif
Sebastian Ottdfc73e72014-04-17 19:46:15 +0200579#ifdef CONFIG_OF
580 &dev_attr_devspec.attr,
581#endif
Alex Williamson782a9852014-05-20 08:53:21 -0600582 &dev_attr_driver_override.attr,
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700583 NULL,
584};
585
586static const struct attribute_group pci_dev_group = {
587 .attrs = pci_dev_attrs,
588};
589
590const struct attribute_group *pci_dev_groups[] = {
591 &pci_dev_group,
592 NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593};
594
Greg Kroah-Hartman56039e62013-07-24 15:05:17 -0700595static struct attribute *pcibus_attrs[] = {
596 &dev_attr_rescan.attr,
597 &dev_attr_cpuaffinity.attr,
598 &dev_attr_cpulistaffinity.attr,
599 NULL,
600};
601
602static const struct attribute_group pcibus_group = {
603 .attrs = pcibus_attrs,
604};
605
606const struct attribute_group *pcibus_groups[] = {
607 &pcibus_group,
608 NULL,
Yinghai Lub9d320f2011-05-12 17:11:39 -0700609};
610
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400611static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
612 char *buf)
Dave Airlie217f45d2009-03-04 05:57:05 +0000613{
614 struct pci_dev *pdev = to_pci_dev(dev);
Matthew Garrett1a39b312012-04-16 16:26:02 -0400615 struct pci_dev *vga_dev = vga_default_device();
616
617 if (vga_dev)
618 return sprintf(buf, "%u\n", (pdev == vga_dev));
Dave Airlie217f45d2009-03-04 05:57:05 +0000619
620 return sprintf(buf, "%u\n",
621 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
622 IORESOURCE_ROM_SHADOW));
623}
Sachin Kamatbf22c902013-09-28 15:42:00 +0530624static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
Dave Airlie217f45d2009-03-04 05:57:05 +0000625
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400626static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
627 struct bin_attribute *bin_attr, char *buf,
628 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400630 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device,
631 kobj));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 unsigned int size = 64;
633 loff_t init_off = off;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400634 u8 *data = (u8 *) buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635
636 /* Several chips lock up trying to read undefined config space */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400637 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 size = dev->cfg_size;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400639 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 size = 128;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
642 if (off > size)
643 return 0;
644 if (off + count > size) {
645 size -= off;
646 count = size;
647 } else {
648 size = count;
649 }
650
Huang Ying3d8387e2012-08-15 09:43:03 +0800651 pci_config_pm_runtime_get(dev);
652
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900653 if ((off & 1) && size) {
654 u8 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700655 pci_user_read_config_byte(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900656 data[off - init_off] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 off++;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900658 size--;
659 }
660
661 if ((off & 3) && size > 2) {
662 u16 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700663 pci_user_read_config_word(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900664 data[off - init_off] = val & 0xff;
665 data[off - init_off + 1] = (val >> 8) & 0xff;
666 off += 2;
667 size -= 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 }
669
670 while (size > 3) {
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900671 u32 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700672 pci_user_read_config_dword(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900673 data[off - init_off] = val & 0xff;
674 data[off - init_off + 1] = (val >> 8) & 0xff;
675 data[off - init_off + 2] = (val >> 16) & 0xff;
676 data[off - init_off + 3] = (val >> 24) & 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 off += 4;
678 size -= 4;
679 }
680
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900681 if (size >= 2) {
682 u16 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700683 pci_user_read_config_word(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900684 data[off - init_off] = val & 0xff;
685 data[off - init_off + 1] = (val >> 8) & 0xff;
686 off += 2;
687 size -= 2;
688 }
689
690 if (size > 0) {
691 u8 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700692 pci_user_read_config_byte(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900693 data[off - init_off] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 off++;
695 --size;
696 }
697
Huang Ying3d8387e2012-08-15 09:43:03 +0800698 pci_config_pm_runtime_put(dev);
699
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 return count;
701}
702
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400703static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
704 struct bin_attribute *bin_attr, char *buf,
705 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400707 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device,
708 kobj));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 unsigned int size = count;
710 loff_t init_off = off;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400711 u8 *data = (u8 *) buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
713 if (off > dev->cfg_size)
714 return 0;
715 if (off + count > dev->cfg_size) {
716 size = dev->cfg_size - off;
717 count = size;
718 }
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700719
Huang Ying3d8387e2012-08-15 09:43:03 +0800720 pci_config_pm_runtime_get(dev);
721
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900722 if ((off & 1) && size) {
Brian Kinge04b0ea2005-09-27 01:21:55 -0700723 pci_user_write_config_byte(dev, off, data[off - init_off]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 off++;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900725 size--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 }
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700727
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900728 if ((off & 3) && size > 2) {
729 u16 val = data[off - init_off];
730 val |= (u16) data[off - init_off + 1] << 8;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400731 pci_user_write_config_word(dev, off, val);
732 off += 2;
733 size -= 2;
734 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
736 while (size > 3) {
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900737 u32 val = data[off - init_off];
738 val |= (u32) data[off - init_off + 1] << 8;
739 val |= (u32) data[off - init_off + 2] << 16;
740 val |= (u32) data[off - init_off + 3] << 24;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700741 pci_user_write_config_dword(dev, off, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 off += 4;
743 size -= 4;
744 }
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700745
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900746 if (size >= 2) {
747 u16 val = data[off - init_off];
748 val |= (u16) data[off - init_off + 1] << 8;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700749 pci_user_write_config_word(dev, off, val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900750 off += 2;
751 size -= 2;
752 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900754 if (size) {
Brian Kinge04b0ea2005-09-27 01:21:55 -0700755 pci_user_write_config_byte(dev, off, data[off - init_off]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 off++;
757 --size;
758 }
759
Huang Ying3d8387e2012-08-15 09:43:03 +0800760 pci_config_pm_runtime_put(dev);
761
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 return count;
763}
764
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400765static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
766 struct bin_attribute *bin_attr, char *buf,
767 loff_t off, size_t count)
Ben Hutchings94e61082008-03-05 16:52:39 +0000768{
769 struct pci_dev *dev =
770 to_pci_dev(container_of(kobj, struct device, kobj));
Ben Hutchings94e61082008-03-05 16:52:39 +0000771
772 if (off > bin_attr->size)
773 count = 0;
774 else if (count > bin_attr->size - off)
775 count = bin_attr->size - off;
Ben Hutchings94e61082008-03-05 16:52:39 +0000776
Stephen Hemminger287d19c2008-12-18 09:17:16 -0800777 return pci_read_vpd(dev, off, count, buf);
778}
Ben Hutchings94e61082008-03-05 16:52:39 +0000779
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400780static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
781 struct bin_attribute *bin_attr, char *buf,
782 loff_t off, size_t count)
Stephen Hemminger287d19c2008-12-18 09:17:16 -0800783{
784 struct pci_dev *dev =
785 to_pci_dev(container_of(kobj, struct device, kobj));
786
787 if (off > bin_attr->size)
788 count = 0;
789 else if (count > bin_attr->size - off)
790 count = bin_attr->size - off;
791
792 return pci_write_vpd(dev, off, count, buf);
Ben Hutchings94e61082008-03-05 16:52:39 +0000793}
794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795#ifdef HAVE_PCI_LEGACY
796/**
797 * pci_read_legacy_io - read byte(s) from legacy I/O port space
Chris Wright2c3c8be2010-05-12 18:28:57 -0700798 * @filp: open sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 * @kobj: kobject corresponding to file to read from
Randy Dunlapcffb2fa2009-04-10 15:17:50 -0700800 * @bin_attr: struct bin_attribute for this file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 * @buf: buffer to store results
802 * @off: offset into legacy I/O port space
803 * @count: number of bytes to read
804 *
805 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
806 * callback routine (pci_legacy_read).
807 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400808static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
809 struct bin_attribute *bin_attr, char *buf,
810 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400812 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 kobj));
814
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400815 /* Only support 1, 2 or 4 byte accesses */
816 if (count != 1 && count != 2 && count != 4)
817 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400819 return pci_legacy_read(bus, off, (u32 *)buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820}
821
822/**
823 * pci_write_legacy_io - write byte(s) to legacy I/O port space
Chris Wright2c3c8be2010-05-12 18:28:57 -0700824 * @filp: open sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 * @kobj: kobject corresponding to file to read from
Randy Dunlapcffb2fa2009-04-10 15:17:50 -0700826 * @bin_attr: struct bin_attribute for this file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 * @buf: buffer containing value to be written
828 * @off: offset into legacy I/O port space
829 * @count: number of bytes to write
830 *
831 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
832 * callback routine (pci_legacy_write).
833 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400834static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
835 struct bin_attribute *bin_attr, char *buf,
836 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400838 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 kobj));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400841 /* Only support 1, 2 or 4 byte accesses */
842 if (count != 1 && count != 2 && count != 4)
843 return -EINVAL;
844
845 return pci_legacy_write(bus, off, *(u32 *)buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846}
847
848/**
849 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
Chris Wright2c3c8be2010-05-12 18:28:57 -0700850 * @filp: open sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 * @kobj: kobject corresponding to device to be mapped
852 * @attr: struct bin_attribute for this file
853 * @vma: struct vm_area_struct passed to mmap
854 *
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000855 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 * legacy memory space (first meg of bus space) into application virtual
857 * memory space.
858 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400859static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
860 struct bin_attribute *attr,
861 struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400863 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 kobj));
865
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400866 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000867}
868
869/**
870 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
Chris Wright2c3c8be2010-05-12 18:28:57 -0700871 * @filp: open sysfs file
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000872 * @kobj: kobject corresponding to device to be mapped
873 * @attr: struct bin_attribute for this file
874 * @vma: struct vm_area_struct passed to mmap
875 *
876 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
877 * legacy IO space (first meg of bus space) into application virtual
878 * memory space. Returns -ENOSYS if the operation isn't supported
879 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400880static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
881 struct bin_attribute *attr,
882 struct vm_area_struct *vma)
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000883{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400884 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000885 kobj));
886
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400887 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000888}
889
890/**
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300891 * pci_adjust_legacy_attr - adjustment of legacy file attributes
892 * @b: bus to create files under
893 * @mmap_type: I/O port or memory
894 *
895 * Stub implementation. Can be overridden by arch if necessary.
896 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400897void __weak pci_adjust_legacy_attr(struct pci_bus *b,
898 enum pci_mmap_state mmap_type)
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300899{
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300900}
901
902/**
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000903 * pci_create_legacy_files - create legacy I/O port and memory files
904 * @b: bus to create files under
905 *
906 * Some platforms allow access to legacy I/O port and ISA memory space on
907 * a per-bus basis. This routine creates the files and ties them into
908 * their associated read, write and mmap files from pci-sysfs.c
909 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300910 * On error unwind, but don't propagate the error to the caller
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000911 * as it is ok to set up the PCI bus without these files.
912 */
913void pci_create_legacy_files(struct pci_bus *b)
914{
915 int error;
916
917 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
918 GFP_ATOMIC);
919 if (!b->legacy_io)
920 goto kzalloc_err;
921
Stephen Rothwell62e877b82010-03-01 20:38:36 +1100922 sysfs_bin_attr_init(b->legacy_io);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000923 b->legacy_io->attr.name = "legacy_io";
924 b->legacy_io->size = 0xffff;
925 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
926 b->legacy_io->read = pci_read_legacy_io;
927 b->legacy_io->write = pci_write_legacy_io;
928 b->legacy_io->mmap = pci_mmap_legacy_io;
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300929 pci_adjust_legacy_attr(b, pci_mmap_io);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000930 error = device_create_bin_file(&b->dev, b->legacy_io);
931 if (error)
932 goto legacy_io_err;
933
934 /* Allocated above after the legacy_io struct */
935 b->legacy_mem = b->legacy_io + 1;
Mel Gorman6757eca32010-03-10 22:48:34 +0000936 sysfs_bin_attr_init(b->legacy_mem);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000937 b->legacy_mem->attr.name = "legacy_mem";
938 b->legacy_mem->size = 1024*1024;
939 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
940 b->legacy_mem->mmap = pci_mmap_legacy_mem;
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300941 pci_adjust_legacy_attr(b, pci_mmap_mem);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000942 error = device_create_bin_file(&b->dev, b->legacy_mem);
943 if (error)
944 goto legacy_mem_err;
945
946 return;
947
948legacy_mem_err:
949 device_remove_bin_file(&b->dev, b->legacy_io);
950legacy_io_err:
951 kfree(b->legacy_io);
952 b->legacy_io = NULL;
953kzalloc_err:
Ryan Desfosses227f0642014-04-18 20:13:50 -0400954 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000955 return;
956}
957
958void pci_remove_legacy_files(struct pci_bus *b)
959{
960 if (b->legacy_io) {
961 device_remove_bin_file(&b->dev, b->legacy_io);
962 device_remove_bin_file(&b->dev, b->legacy_mem);
963 kfree(b->legacy_io); /* both are allocated here */
964 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965}
966#endif /* HAVE_PCI_LEGACY */
967
968#ifdef HAVE_PCI_MMAP
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700969
Martin Wilck3b519e42010-11-10 11:03:21 +0100970int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
971 enum pci_mmap_api mmap_api)
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700972{
Martin Wilck3b519e42010-11-10 11:03:21 +0100973 unsigned long nr, start, size, pci_start;
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700974
Martin Wilck3b519e42010-11-10 11:03:21 +0100975 if (pci_resource_len(pdev, resno) == 0)
976 return 0;
Libin64b00172013-04-15 02:48:54 +0000977 nr = vma_pages(vma);
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700978 start = vma->vm_pgoff;
Ed Swierk88e7df02008-11-03 14:41:16 -0800979 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
Darrick J. Wong8c05cd02010-11-16 09:13:41 -0800980 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
Martin Wilck3b519e42010-11-10 11:03:21 +0100981 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
982 if (start >= pci_start && start < pci_start + size &&
983 start + nr <= pci_start + size)
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700984 return 1;
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700985 return 0;
986}
987
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988/**
989 * pci_mmap_resource - map a PCI resource into user memory space
990 * @kobj: kobject for mapping
991 * @attr: struct bin_attribute for the file being mapped
992 * @vma: struct vm_area_struct passed into the mmap
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700993 * @write_combine: 1 for write_combine mapping
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 *
995 * Use the regular PCI mapping routines to map a PCI resource into userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400997static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
998 struct vm_area_struct *vma, int write_combine)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999{
1000 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1001 struct device, kobj));
Kulikov Vasiliya3f58352010-06-29 14:15:28 +04001002 struct resource *res = attr->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 enum pci_mmap_state mmap_type;
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -07001004 resource_size_t start, end;
Michael Ellerman2311b1f2005-05-13 17:44:10 +10001005 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
Michael Ellerman2311b1f2005-05-13 17:44:10 +10001007 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1008 if (res == &pdev->resource[i])
1009 break;
1010 if (i >= PCI_ROM_RESOURCE)
1011 return -ENODEV;
1012
Martin Wilck3b519e42010-11-10 11:03:21 +01001013 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
Ryan Desfosses227f0642014-04-18 20:13:50 -04001014 WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
Martin Wilck3b519e42010-11-10 11:03:21 +01001015 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
1016 pci_name(pdev), i,
Randy Dunlape25cd062010-11-13 08:44:33 -08001017 (u64)pci_resource_start(pdev, i),
1018 (u64)pci_resource_len(pdev, i));
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -07001019 return -EINVAL;
Martin Wilck3b519e42010-11-10 11:03:21 +01001020 }
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -07001021
Michael Ellerman2311b1f2005-05-13 17:44:10 +10001022 /* pci_mmap_page_range() expects the same kind of entry as coming
1023 * from /proc/bus/pci/ which is a "user visible" value. If this is
1024 * different from the resource itself, arch will do necessary fixup.
1025 */
1026 pci_resource_to_user(pdev, i, res, &start, &end);
1027 vma->vm_pgoff += start >> PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1029
Arjan van de Vene8de1482008-10-22 19:55:31 -07001030 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
1031 return -EINVAL;
1032
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001033 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1034}
1035
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001036static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1037 struct bin_attribute *attr,
1038 struct vm_area_struct *vma)
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001039{
1040 return pci_mmap_resource(kobj, attr, vma, 0);
1041}
1042
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001043static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1044 struct bin_attribute *attr,
1045 struct vm_area_struct *vma)
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001046{
1047 return pci_mmap_resource(kobj, attr, vma, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048}
1049
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001050static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1051 struct bin_attribute *attr, char *buf,
1052 loff_t off, size_t count, bool write)
Alex Williamson86333282010-07-19 09:45:34 -06001053{
1054 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1055 struct device, kobj));
1056 struct resource *res = attr->private;
1057 unsigned long port = off;
1058 int i;
1059
1060 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1061 if (res == &pdev->resource[i])
1062 break;
1063 if (i >= PCI_ROM_RESOURCE)
1064 return -ENODEV;
1065
1066 port += pci_resource_start(pdev, i);
1067
1068 if (port > pci_resource_end(pdev, i))
1069 return 0;
1070
1071 if (port + count - 1 > pci_resource_end(pdev, i))
1072 return -EINVAL;
1073
1074 switch (count) {
1075 case 1:
1076 if (write)
1077 outb(*(u8 *)buf, port);
1078 else
1079 *(u8 *)buf = inb(port);
1080 return 1;
1081 case 2:
1082 if (write)
1083 outw(*(u16 *)buf, port);
1084 else
1085 *(u16 *)buf = inw(port);
1086 return 2;
1087 case 4:
1088 if (write)
1089 outl(*(u32 *)buf, port);
1090 else
1091 *(u32 *)buf = inl(port);
1092 return 4;
1093 }
1094 return -EINVAL;
1095}
1096
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001097static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1098 struct bin_attribute *attr, char *buf,
1099 loff_t off, size_t count)
Alex Williamson86333282010-07-19 09:45:34 -06001100{
1101 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1102}
1103
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001104static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1105 struct bin_attribute *attr, char *buf,
1106 loff_t off, size_t count)
Alex Williamson86333282010-07-19 09:45:34 -06001107{
1108 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1109}
1110
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111/**
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001112 * pci_remove_resource_files - cleanup resource files
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001113 * @pdev: dev to cleanup
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001114 *
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001115 * If we created resource files for @pdev, remove them from sysfs and
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001116 * free their resources.
1117 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001118static void pci_remove_resource_files(struct pci_dev *pdev)
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001119{
1120 int i;
1121
1122 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1123 struct bin_attribute *res_attr;
1124
1125 res_attr = pdev->res_attr[i];
1126 if (res_attr) {
1127 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1128 kfree(res_attr);
1129 }
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001130
1131 res_attr = pdev->res_attr_wc[i];
1132 if (res_attr) {
1133 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1134 kfree(res_attr);
1135 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001136 }
1137}
1138
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001139static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1140{
1141 /* allocate attribute structure, piggyback attribute name */
1142 int name_len = write_combine ? 13 : 10;
1143 struct bin_attribute *res_attr;
1144 int retval;
1145
1146 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1147 if (res_attr) {
1148 char *res_attr_name = (char *)(res_attr + 1);
1149
Eric W. Biedermana07e4152010-02-11 15:23:05 -08001150 sysfs_bin_attr_init(res_attr);
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001151 if (write_combine) {
1152 pdev->res_attr_wc[num] = res_attr;
1153 sprintf(res_attr_name, "resource%d_wc", num);
1154 res_attr->mmap = pci_mmap_resource_wc;
1155 } else {
1156 pdev->res_attr[num] = res_attr;
1157 sprintf(res_attr_name, "resource%d", num);
1158 res_attr->mmap = pci_mmap_resource_uc;
1159 }
Alex Williamson86333282010-07-19 09:45:34 -06001160 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1161 res_attr->read = pci_read_resource_io;
1162 res_attr->write = pci_write_resource_io;
1163 }
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001164 res_attr->attr.name = res_attr_name;
1165 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1166 res_attr->size = pci_resource_len(pdev, num);
1167 res_attr->private = &pdev->resource[num];
1168 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1169 } else
1170 retval = -ENOMEM;
1171
1172 return retval;
1173}
1174
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001175/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 * pci_create_resource_files - create resource files in sysfs for @dev
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001177 * @pdev: dev in question
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 *
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001179 * Walk the resources in @pdev creating files for each resource available.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 */
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001181static int pci_create_resource_files(struct pci_dev *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182{
1183 int i;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001184 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185
1186 /* Expose the PCI resources from this device as files */
1187 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188
1189 /* skip empty resources */
1190 if (!pci_resource_len(pdev, i))
1191 continue;
1192
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001193 retval = pci_create_attr(pdev, i, 0);
1194 /* for prefetchable resources, create a WC mappable file */
1195 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1196 retval = pci_create_attr(pdev, i, 1);
Dmitry Torokhovd48593b2005-04-29 00:58:46 -05001197
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001198 if (retval) {
1199 pci_remove_resource_files(pdev);
1200 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 }
1202 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001203 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204}
1205#else /* !HAVE_PCI_MMAP */
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +03001206int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1207void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208#endif /* HAVE_PCI_MMAP */
1209
1210/**
1211 * pci_write_rom - used to enable access to the PCI ROM display
Chris Wright2c3c8be2010-05-12 18:28:57 -07001212 * @filp: sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 * @kobj: kernel object handle
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001214 * @bin_attr: struct bin_attribute for this file
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 * @buf: user input
1216 * @off: file offset
1217 * @count: number of byte in input
1218 *
1219 * writing anything except 0 enables it
1220 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001221static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1222 struct bin_attribute *bin_attr, char *buf,
1223 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224{
1225 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1226
1227 if ((off == 0) && (*buf == '0') && (count == 2))
1228 pdev->rom_attr_enabled = 0;
1229 else
1230 pdev->rom_attr_enabled = 1;
1231
1232 return count;
1233}
1234
1235/**
1236 * pci_read_rom - read a PCI ROM
Chris Wright2c3c8be2010-05-12 18:28:57 -07001237 * @filp: sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 * @kobj: kernel object handle
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001239 * @bin_attr: struct bin_attribute for this file
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 * @buf: where to put the data we read from the ROM
1241 * @off: file offset
1242 * @count: number of bytes to read
1243 *
1244 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1245 * device corresponding to @kobj.
1246 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001247static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1248 struct bin_attribute *bin_attr, char *buf,
1249 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250{
1251 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1252 void __iomem *rom;
1253 size_t size;
1254
1255 if (!pdev->rom_attr_enabled)
1256 return -EINVAL;
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001257
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
Timothy S. Nelson97c44832009-01-30 06:12:47 +11001259 if (!rom || !size)
1260 return -EIO;
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001261
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 if (off >= size)
1263 count = 0;
1264 else {
1265 if (off + count > size)
1266 count = size - off;
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001267
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 memcpy_fromio(buf, rom + off, count);
1269 }
1270 pci_unmap_rom(pdev, rom);
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001271
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 return count;
1273}
1274
1275static struct bin_attribute pci_config_attr = {
1276 .attr = {
1277 .name = "config",
1278 .mode = S_IRUGO | S_IWUSR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 },
Zhao, Yu557848c2008-10-13 19:18:07 +08001280 .size = PCI_CFG_SPACE_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 .read = pci_read_config,
1282 .write = pci_write_config,
1283};
1284
1285static struct bin_attribute pcie_config_attr = {
1286 .attr = {
1287 .name = "config",
1288 .mode = S_IRUGO | S_IWUSR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 },
Zhao, Yu557848c2008-10-13 19:18:07 +08001290 .size = PCI_CFG_SPACE_EXP_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 .read = pci_read_config,
1292 .write = pci_write_config,
1293};
1294
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001295static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1296 const char *buf, size_t count)
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001297{
1298 struct pci_dev *pdev = to_pci_dev(dev);
1299 unsigned long val;
Jingoo Han9a994e82013-06-01 16:25:25 +09001300 ssize_t result = kstrtoul(buf, 0, &val);
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001301
1302 if (result < 0)
1303 return result;
1304
1305 if (val != 1)
1306 return -EINVAL;
Michal Schmidt447c5dd2010-05-11 11:44:54 +02001307
1308 result = pci_reset_function(pdev);
1309 if (result < 0)
1310 return result;
1311
1312 return count;
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001313}
1314
1315static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1316
Zhao, Yu280c73d2008-10-13 20:01:00 +08001317static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1318{
1319 int retval;
1320 struct bin_attribute *attr;
1321
1322 /* If the device has VPD, try to expose it in sysfs. */
1323 if (dev->vpd) {
1324 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1325 if (!attr)
1326 return -ENOMEM;
1327
Eric W. Biedermana07e4152010-02-11 15:23:05 -08001328 sysfs_bin_attr_init(attr);
Zhao, Yu280c73d2008-10-13 20:01:00 +08001329 attr->size = dev->vpd->len;
1330 attr->attr.name = "vpd";
1331 attr->attr.mode = S_IRUSR | S_IWUSR;
Stephen Hemminger287d19c2008-12-18 09:17:16 -08001332 attr->read = read_vpd_attr;
1333 attr->write = write_vpd_attr;
Zhao, Yu280c73d2008-10-13 20:01:00 +08001334 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1335 if (retval) {
Ben Hutchings0f12a4e2011-01-13 19:47:56 +00001336 kfree(attr);
Zhao, Yu280c73d2008-10-13 20:01:00 +08001337 return retval;
1338 }
1339 dev->vpd->attr = attr;
1340 }
1341
1342 /* Active State Power Management */
1343 pcie_aspm_create_sysfs_dev_files(dev);
1344
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001345 if (!pci_probe_reset_function(dev)) {
1346 retval = device_create_file(&dev->dev, &reset_attr);
1347 if (retval)
1348 goto error;
1349 dev->reset_fn = 1;
1350 }
Zhao, Yu280c73d2008-10-13 20:01:00 +08001351 return 0;
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001352
1353error:
1354 pcie_aspm_remove_sysfs_dev_files(dev);
1355 if (dev->vpd && dev->vpd->attr) {
1356 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1357 kfree(dev->vpd->attr);
1358 }
1359
1360 return retval;
Zhao, Yu280c73d2008-10-13 20:01:00 +08001361}
1362
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001363int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364{
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001365 int retval;
Zhao, Yu280c73d2008-10-13 20:01:00 +08001366 int rom_size = 0;
1367 struct bin_attribute *attr;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001368
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 if (!sysfs_initialized)
1370 return -EACCES;
1371
Zhao, Yu557848c2008-10-13 19:18:07 +08001372 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001373 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 else
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001375 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1376 if (retval)
1377 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001379 retval = pci_create_resource_files(pdev);
1380 if (retval)
Zhao, Yu280c73d2008-10-13 20:01:00 +08001381 goto err_config_file;
1382
1383 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1384 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1385 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1386 rom_size = 0x20000;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
1388 /* If the device has a ROM, try to expose it in sysfs. */
Zhao, Yu280c73d2008-10-13 20:01:00 +08001389 if (rom_size) {
Ben Hutchings94e61082008-03-05 16:52:39 +00001390 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
Zhao, Yu280c73d2008-10-13 20:01:00 +08001391 if (!attr) {
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001392 retval = -ENOMEM;
Michael Ellerman9890b122007-04-18 13:34:12 +10001393 goto err_resource_files;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 }
Eric W. Biedermana07e4152010-02-11 15:23:05 -08001395 sysfs_bin_attr_init(attr);
Zhao, Yu280c73d2008-10-13 20:01:00 +08001396 attr->size = rom_size;
1397 attr->attr.name = "rom";
Alex Williamsonff295302011-01-05 10:26:41 -07001398 attr->attr.mode = S_IRUSR | S_IWUSR;
Zhao, Yu280c73d2008-10-13 20:01:00 +08001399 attr->read = pci_read_rom;
1400 attr->write = pci_write_rom;
1401 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1402 if (retval) {
1403 kfree(attr);
1404 goto err_resource_files;
1405 }
1406 pdev->rom_attr = attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 }
Zhao, Yu280c73d2008-10-13 20:01:00 +08001408
Zhao, Yu280c73d2008-10-13 20:01:00 +08001409 /* add sysfs entries for various capabilities */
1410 retval = pci_create_capabilities_sysfs(pdev);
1411 if (retval)
Yinghai Lu625e1d52012-11-05 15:20:35 -05001412 goto err_rom_file;
Shaohua Li7d715a62008-02-25 09:46:41 +08001413
Narendra K911e1c92010-07-26 05:56:50 -05001414 pci_create_firmware_label_files(pdev);
1415
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 return 0;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001417
Michael Ellermana2cd52c2007-05-08 12:03:08 +10001418err_rom_file:
Zhao, Yu280c73d2008-10-13 20:01:00 +08001419 if (rom_size) {
Ben Hutchings94e61082008-03-05 16:52:39 +00001420 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
Zhao, Yu280c73d2008-10-13 20:01:00 +08001421 kfree(pdev->rom_attr);
1422 pdev->rom_attr = NULL;
1423 }
Michael Ellerman9890b122007-04-18 13:34:12 +10001424err_resource_files:
1425 pci_remove_resource_files(pdev);
Ben Hutchings94e61082008-03-05 16:52:39 +00001426err_config_file:
Zhao, Yu557848c2008-10-13 19:18:07 +08001427 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001428 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1429 else
1430 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1431err:
1432 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433}
1434
Zhao, Yu280c73d2008-10-13 20:01:00 +08001435static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1436{
1437 if (dev->vpd && dev->vpd->attr) {
1438 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1439 kfree(dev->vpd->attr);
1440 }
1441
1442 pcie_aspm_remove_sysfs_dev_files(dev);
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001443 if (dev->reset_fn) {
1444 device_remove_file(&dev->dev, &reset_attr);
1445 dev->reset_fn = 0;
1446 }
Zhao, Yu280c73d2008-10-13 20:01:00 +08001447}
1448
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449/**
1450 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1451 * @pdev: device whose entries we should free
1452 *
1453 * Cleanup when @pdev is removed from sysfs.
1454 */
1455void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1456{
Zhao, Yu280c73d2008-10-13 20:01:00 +08001457 int rom_size = 0;
1458
David Millerd67afe52006-11-10 12:27:48 -08001459 if (!sysfs_initialized)
1460 return;
1461
Zhao, Yu280c73d2008-10-13 20:01:00 +08001462 pci_remove_capabilities_sysfs(pdev);
Shaohua Li7d715a62008-02-25 09:46:41 +08001463
Zhao, Yu557848c2008-10-13 19:18:07 +08001464 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1466 else
1467 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1468
1469 pci_remove_resource_files(pdev);
1470
Zhao, Yu280c73d2008-10-13 20:01:00 +08001471 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1472 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1473 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1474 rom_size = 0x20000;
1475
1476 if (rom_size && pdev->rom_attr) {
1477 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1478 kfree(pdev->rom_attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479 }
Narendra K911e1c92010-07-26 05:56:50 -05001480
1481 pci_remove_firmware_label_files(pdev);
1482
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483}
1484
1485static int __init pci_sysfs_init(void)
1486{
1487 struct pci_dev *pdev = NULL;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001488 int retval;
1489
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 sysfs_initialized = 1;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001491 for_each_pci_dev(pdev) {
1492 retval = pci_create_sysfs_dev_files(pdev);
Julia Lawall151fc5d2007-11-20 08:41:16 +01001493 if (retval) {
1494 pci_dev_put(pdev);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001495 return retval;
Julia Lawall151fc5d2007-11-20 08:41:16 +01001496 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001497 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498
1499 return 0;
1500}
Jesse Barnes40ee9e92007-03-24 11:03:32 -07001501late_initcall(pci_sysfs_init);
Yinghai Lu4e15c462012-11-05 15:20:34 -05001502
1503static struct attribute *pci_dev_dev_attrs[] = {
Yinghai Lu625e1d52012-11-05 15:20:35 -05001504 &vga_attr.attr,
Yinghai Lu4e15c462012-11-05 15:20:34 -05001505 NULL,
1506};
1507
1508static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001509 struct attribute *a, int n)
Yinghai Lu4e15c462012-11-05 15:20:34 -05001510{
Yinghai Lu625e1d52012-11-05 15:20:35 -05001511 struct device *dev = container_of(kobj, struct device, kobj);
1512 struct pci_dev *pdev = to_pci_dev(dev);
1513
1514 if (a == &vga_attr.attr)
1515 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1516 return 0;
1517
Yinghai Lu4e15c462012-11-05 15:20:34 -05001518 return a->mode;
1519}
1520
Jiang Liudfab88b2013-05-31 12:21:31 +08001521static struct attribute *pci_dev_hp_attrs[] = {
1522 &dev_remove_attr.attr,
1523 &dev_rescan_attr.attr,
1524 NULL,
1525};
1526
1527static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001528 struct attribute *a, int n)
Jiang Liudfab88b2013-05-31 12:21:31 +08001529{
1530 struct device *dev = container_of(kobj, struct device, kobj);
1531 struct pci_dev *pdev = to_pci_dev(dev);
1532
1533 if (pdev->is_virtfn)
1534 return 0;
1535
1536 return a->mode;
1537}
1538
1539static struct attribute_group pci_dev_hp_attr_group = {
1540 .attrs = pci_dev_hp_attrs,
1541 .is_visible = pci_dev_hp_attrs_are_visible,
1542};
1543
Donald Dutile17893822012-11-05 15:20:36 -05001544#ifdef CONFIG_PCI_IOV
1545static struct attribute *sriov_dev_attrs[] = {
1546 &sriov_totalvfs_attr.attr,
1547 &sriov_numvfs_attr.attr,
1548 NULL,
1549};
1550
1551static umode_t sriov_attrs_are_visible(struct kobject *kobj,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001552 struct attribute *a, int n)
Donald Dutile17893822012-11-05 15:20:36 -05001553{
1554 struct device *dev = container_of(kobj, struct device, kobj);
1555
1556 if (!dev_is_pf(dev))
1557 return 0;
1558
1559 return a->mode;
1560}
1561
1562static struct attribute_group sriov_dev_attr_group = {
1563 .attrs = sriov_dev_attrs,
1564 .is_visible = sriov_attrs_are_visible,
1565};
1566#endif /* CONFIG_PCI_IOV */
1567
Yinghai Lu4e15c462012-11-05 15:20:34 -05001568static struct attribute_group pci_dev_attr_group = {
1569 .attrs = pci_dev_dev_attrs,
1570 .is_visible = pci_dev_attrs_are_visible,
1571};
1572
1573static const struct attribute_group *pci_dev_attr_groups[] = {
1574 &pci_dev_attr_group,
Jiang Liudfab88b2013-05-31 12:21:31 +08001575 &pci_dev_hp_attr_group,
Donald Dutile17893822012-11-05 15:20:36 -05001576#ifdef CONFIG_PCI_IOV
1577 &sriov_dev_attr_group,
1578#endif
Yinghai Lu4e15c462012-11-05 15:20:34 -05001579 NULL,
1580};
1581
1582struct device_type pci_dev_type = {
1583 .groups = pci_dev_attr_groups,
1584};