blob: bcd10c795284cff70a58e73aac8ce2810da6831e [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
Mathias Krause3dcc8d32015-11-09 20:00:27 +0100219 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
220 return -EINVAL;
221
222 if (node != NUMA_NO_NODE && !node_online(node))
Prarit Bhargava63692df2014-10-23 14:22:12 -0400223 return -EINVAL;
224
225 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
226 dev_alert(&pdev->dev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
227 node);
228
229 dev->numa_node = node;
230 return count;
231}
232
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400233static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
234 char *buf)
Brice Goglin81bb0e12007-01-28 10:53:40 +0100235{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400236 return sprintf(buf, "%d\n", dev->numa_node);
Brice Goglin81bb0e12007-01-28 10:53:40 +0100237}
Prarit Bhargava63692df2014-10-23 14:22:12 -0400238static DEVICE_ATTR_RW(numa_node);
Brice Goglin81bb0e12007-01-28 10:53:40 +0100239#endif
240
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400241static ssize_t dma_mask_bits_show(struct device *dev,
242 struct device_attribute *attr, char *buf)
Yinghai Lubb965402009-11-24 18:21:21 -0800243{
244 struct pci_dev *pdev = to_pci_dev(dev);
245
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400246 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
Yinghai Lubb965402009-11-24 18:21:21 -0800247}
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700248static DEVICE_ATTR_RO(dma_mask_bits);
Yinghai Lubb965402009-11-24 18:21:21 -0800249
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400250static ssize_t consistent_dma_mask_bits_show(struct device *dev,
251 struct device_attribute *attr,
252 char *buf)
Yinghai Lubb965402009-11-24 18:21:21 -0800253{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400254 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
Yinghai Lubb965402009-11-24 18:21:21 -0800255}
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700256static DEVICE_ATTR_RO(consistent_dma_mask_bits);
Yinghai Lubb965402009-11-24 18:21:21 -0800257
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400258static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
259 char *buf)
Brice Goglinfe970642006-08-31 01:55:15 -0400260{
261 struct pci_dev *pdev = to_pci_dev(dev);
Yijing Wang468ff152014-09-23 13:27:24 +0800262 struct pci_bus *subordinate = pdev->subordinate;
Brice Goglinfe970642006-08-31 01:55:15 -0400263
Yijing Wang468ff152014-09-23 13:27:24 +0800264 return sprintf(buf, "%u\n", subordinate ?
265 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
266 : !pdev->no_msi);
Brice Goglinfe970642006-08-31 01:55:15 -0400267}
268
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400269static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
270 const char *buf, size_t count)
Brice Goglinfe970642006-08-31 01:55:15 -0400271{
272 struct pci_dev *pdev = to_pci_dev(dev);
Yijing Wang468ff152014-09-23 13:27:24 +0800273 struct pci_bus *subordinate = pdev->subordinate;
Trent Piepho92425a42008-11-30 17:10:12 -0800274 unsigned long val;
275
Jingoo Han9a994e82013-06-01 16:25:25 +0900276 if (kstrtoul(buf, 0, &val) < 0)
Trent Piepho92425a42008-11-30 17:10:12 -0800277 return -EINVAL;
Brice Goglinfe970642006-08-31 01:55:15 -0400278
Brice Goglinfe970642006-08-31 01:55:15 -0400279 if (!capable(CAP_SYS_ADMIN))
Trent Piepho92425a42008-11-30 17:10:12 -0800280 return -EPERM;
Brice Goglinfe970642006-08-31 01:55:15 -0400281
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700282 /*
Yijing Wang468ff152014-09-23 13:27:24 +0800283 * "no_msi" and "bus_flags" only affect what happens when a driver
284 * requests MSI or MSI-X. They don't affect any drivers that have
285 * already requested MSI or MSI-X.
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700286 */
Yijing Wang468ff152014-09-23 13:27:24 +0800287 if (!subordinate) {
288 pdev->no_msi = !val;
289 dev_info(&pdev->dev, "MSI/MSI-X %s for future drivers\n",
290 val ? "allowed" : "disallowed");
Brice Goglinfe970642006-08-31 01:55:15 -0400291 return count;
Brice Goglinfe970642006-08-31 01:55:15 -0400292 }
293
Yijing Wang468ff152014-09-23 13:27:24 +0800294 if (val)
295 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
296 else
297 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
298
299 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
300 val ? "allowed" : "disallowed");
Brice Goglinfe970642006-08-31 01:55:15 -0400301 return count;
302}
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700303static DEVICE_ATTR_RW(msi_bus);
Greg KH98885492005-05-05 11:57:25 -0700304
Alex Chiang705b1aa2009-03-20 14:56:31 -0600305static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
306 size_t count)
307{
308 unsigned long val;
309 struct pci_bus *b = NULL;
310
Jingoo Han9a994e82013-06-01 16:25:25 +0900311 if (kstrtoul(buf, 0, &val) < 0)
Alex Chiang705b1aa2009-03-20 14:56:31 -0600312 return -EINVAL;
313
314 if (val) {
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100315 pci_lock_rescan_remove();
Alex Chiang705b1aa2009-03-20 14:56:31 -0600316 while ((b = pci_find_next_bus(b)) != NULL)
317 pci_rescan_bus(b);
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100318 pci_unlock_rescan_remove();
Alex Chiang705b1aa2009-03-20 14:56:31 -0600319 }
320 return count;
321}
Greg Kroah-Hartman0f49ba52013-10-07 14:51:02 -0600322static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
Alex Chiang705b1aa2009-03-20 14:56:31 -0600323
Sachin Kamatbf22c902013-09-28 15:42:00 +0530324static struct attribute *pci_bus_attrs[] = {
Greg Kroah-Hartman0f49ba52013-10-07 14:51:02 -0600325 &bus_attr_rescan.attr,
326 NULL,
327};
328
329static const struct attribute_group pci_bus_group = {
330 .attrs = pci_bus_attrs,
331};
332
333const struct attribute_group *pci_bus_groups[] = {
334 &pci_bus_group,
335 NULL,
Alex Chiang705b1aa2009-03-20 14:56:31 -0600336};
Alex Chiang77c27c72009-03-20 14:56:36 -0600337
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400338static ssize_t dev_rescan_store(struct device *dev,
339 struct device_attribute *attr, const char *buf,
340 size_t count)
Alex Chiang738a6392009-03-20 14:56:41 -0600341{
342 unsigned long val;
343 struct pci_dev *pdev = to_pci_dev(dev);
344
Jingoo Han9a994e82013-06-01 16:25:25 +0900345 if (kstrtoul(buf, 0, &val) < 0)
Alex Chiang738a6392009-03-20 14:56:41 -0600346 return -EINVAL;
347
348 if (val) {
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100349 pci_lock_rescan_remove();
Alex Chiang738a6392009-03-20 14:56:41 -0600350 pci_rescan_bus(pdev->bus);
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100351 pci_unlock_rescan_remove();
Alex Chiang738a6392009-03-20 14:56:41 -0600352 }
353 return count;
354}
Sachin Kamatbf22c902013-09-28 15:42:00 +0530355static struct device_attribute dev_rescan_attr = __ATTR(rescan,
356 (S_IWUSR|S_IWGRP),
357 NULL, dev_rescan_store);
Alex Chiang738a6392009-03-20 14:56:41 -0600358
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400359static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
360 const char *buf, size_t count)
Alex Chiang77c27c72009-03-20 14:56:36 -0600361{
Alex Chiang77c27c72009-03-20 14:56:36 -0600362 unsigned long val;
Alex Chiang77c27c72009-03-20 14:56:36 -0600363
Jingoo Han9a994e82013-06-01 16:25:25 +0900364 if (kstrtoul(buf, 0, &val) < 0)
Alex Chiang77c27c72009-03-20 14:56:36 -0600365 return -EINVAL;
366
Tejun Heobc6caf02014-02-03 14:03:02 -0500367 if (val && device_remove_file_self(dev, attr))
368 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
Alex Chiang77c27c72009-03-20 14:56:36 -0600369 return count;
370}
Sachin Kamatbf22c902013-09-28 15:42:00 +0530371static struct device_attribute dev_remove_attr = __ATTR(remove,
372 (S_IWUSR|S_IWGRP),
373 NULL, remove_store);
Yinghai Lub9d320f2011-05-12 17:11:39 -0700374
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400375static ssize_t dev_bus_rescan_store(struct device *dev,
376 struct device_attribute *attr,
377 const char *buf, size_t count)
Yinghai Lub9d320f2011-05-12 17:11:39 -0700378{
379 unsigned long val;
380 struct pci_bus *bus = to_pci_bus(dev);
381
Jingoo Han9a994e82013-06-01 16:25:25 +0900382 if (kstrtoul(buf, 0, &val) < 0)
Yinghai Lub9d320f2011-05-12 17:11:39 -0700383 return -EINVAL;
384
385 if (val) {
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100386 pci_lock_rescan_remove();
Yinghai Lu2f320522012-01-21 02:08:22 -0800387 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
388 pci_rescan_bus_bridge_resize(bus->self);
389 else
390 pci_rescan_bus(bus);
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100391 pci_unlock_rescan_remove();
Yinghai Lub9d320f2011-05-12 17:11:39 -0700392 }
393 return count;
394}
Greg Kroah-Hartman56039e62013-07-24 15:05:17 -0700395static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
Yinghai Lub9d320f2011-05-12 17:11:39 -0700396
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +0100397#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
Huang Ying448bd852012-06-23 10:23:51 +0800398static ssize_t d3cold_allowed_store(struct device *dev,
399 struct device_attribute *attr,
400 const char *buf, size_t count)
401{
402 struct pci_dev *pdev = to_pci_dev(dev);
403 unsigned long val;
404
Jingoo Han9a994e82013-06-01 16:25:25 +0900405 if (kstrtoul(buf, 0, &val) < 0)
Huang Ying448bd852012-06-23 10:23:51 +0800406 return -EINVAL;
407
408 pdev->d3cold_allowed = !!val;
Mika Westerberg9d26d3a2016-06-02 11:17:12 +0300409 if (pdev->d3cold_allowed)
410 pci_d3cold_enable(pdev);
411 else
412 pci_d3cold_disable(pdev);
413
Huang Ying448bd852012-06-23 10:23:51 +0800414 pm_runtime_resume(dev);
415
416 return count;
417}
418
419static ssize_t d3cold_allowed_show(struct device *dev,
420 struct device_attribute *attr, char *buf)
421{
422 struct pci_dev *pdev = to_pci_dev(dev);
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400423 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
Huang Ying448bd852012-06-23 10:23:51 +0800424}
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700425static DEVICE_ATTR_RW(d3cold_allowed);
Huang Ying448bd852012-06-23 10:23:51 +0800426#endif
427
Sebastian Ottdfc73e72014-04-17 19:46:15 +0200428#ifdef CONFIG_OF
429static ssize_t devspec_show(struct device *dev,
430 struct device_attribute *attr, char *buf)
431{
432 struct pci_dev *pdev = to_pci_dev(dev);
433 struct device_node *np = pci_device_to_OF_node(pdev);
434
435 if (np == NULL || np->full_name == NULL)
436 return 0;
437 return sprintf(buf, "%s", np->full_name);
438}
439static DEVICE_ATTR_RO(devspec);
440#endif
441
Donald Dutile17893822012-11-05 15:20:36 -0500442#ifdef CONFIG_PCI_IOV
443static ssize_t sriov_totalvfs_show(struct device *dev,
444 struct device_attribute *attr,
445 char *buf)
446{
447 struct pci_dev *pdev = to_pci_dev(dev);
448
Donald Dutilebff73152012-11-05 15:20:37 -0500449 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
Donald Dutile17893822012-11-05 15:20:36 -0500450}
451
452
453static ssize_t sriov_numvfs_show(struct device *dev,
454 struct device_attribute *attr,
455 char *buf)
456{
457 struct pci_dev *pdev = to_pci_dev(dev);
458
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700459 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
Donald Dutile17893822012-11-05 15:20:36 -0500460}
461
462/*
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700463 * num_vfs > 0; number of VFs to enable
464 * num_vfs = 0; disable all VFs
Donald Dutile17893822012-11-05 15:20:36 -0500465 *
466 * Note: SRIOV spec doesn't allow partial VF
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700467 * disable, so it's all or none.
Donald Dutile17893822012-11-05 15:20:36 -0500468 */
469static ssize_t sriov_numvfs_store(struct device *dev,
470 struct device_attribute *attr,
471 const char *buf, size_t count)
472{
473 struct pci_dev *pdev = to_pci_dev(dev);
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700474 int ret;
475 u16 num_vfs;
Donald Dutile17893822012-11-05 15:20:36 -0500476
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700477 ret = kstrtou16(buf, 0, &num_vfs);
478 if (ret < 0)
479 return ret;
480
481 if (num_vfs > pci_sriov_get_totalvfs(pdev))
482 return -ERANGE;
483
484 if (num_vfs == pdev->sriov->num_VFs)
485 return count; /* no change */
Donald Dutile17893822012-11-05 15:20:36 -0500486
487 /* is PF driver loaded w/callback */
488 if (!pdev->driver || !pdev->driver->sriov_configure) {
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700489 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
Donald Dutile17893822012-11-05 15:20:36 -0500490 return -ENOSYS;
491 }
492
Donald Dutile17893822012-11-05 15:20:36 -0500493 if (num_vfs == 0) {
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700494 /* disable VFs */
495 ret = pdev->driver->sriov_configure(pdev, 0);
496 if (ret < 0)
497 return ret;
498 return count;
Donald Dutile17893822012-11-05 15:20:36 -0500499 }
500
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700501 /* enable VFs */
502 if (pdev->sriov->num_VFs) {
503 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
504 pdev->sriov->num_VFs, num_vfs);
505 return -EBUSY;
506 }
Donald Dutile17893822012-11-05 15:20:36 -0500507
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700508 ret = pdev->driver->sriov_configure(pdev, num_vfs);
509 if (ret < 0)
510 return ret;
511
512 if (ret != num_vfs)
513 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
514 num_vfs, ret);
515
516 return count;
Donald Dutile17893822012-11-05 15:20:36 -0500517}
518
519static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
520static struct device_attribute sriov_numvfs_attr =
521 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
522 sriov_numvfs_show, sriov_numvfs_store);
523#endif /* CONFIG_PCI_IOV */
524
Alex Williamson782a9852014-05-20 08:53:21 -0600525static ssize_t driver_override_store(struct device *dev,
526 struct device_attribute *attr,
527 const char *buf, size_t count)
528{
529 struct pci_dev *pdev = to_pci_dev(dev);
530 char *driver_override, *old = pdev->driver_override, *cp;
531
Sasha Levin4efe8742015-02-04 17:38:15 -0500532 /* We need to keep extra room for a newline */
533 if (count >= (PAGE_SIZE - 1))
Alex Williamson782a9852014-05-20 08:53:21 -0600534 return -EINVAL;
535
536 driver_override = kstrndup(buf, count, GFP_KERNEL);
537 if (!driver_override)
538 return -ENOMEM;
539
540 cp = strchr(driver_override, '\n');
541 if (cp)
542 *cp = '\0';
543
544 if (strlen(driver_override)) {
545 pdev->driver_override = driver_override;
546 } else {
547 kfree(driver_override);
548 pdev->driver_override = NULL;
549 }
550
551 kfree(old);
552
553 return count;
554}
555
556static ssize_t driver_override_show(struct device *dev,
557 struct device_attribute *attr, char *buf)
558{
559 struct pci_dev *pdev = to_pci_dev(dev);
560
Sasha Levin4efe8742015-02-04 17:38:15 -0500561 return snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
Alex Williamson782a9852014-05-20 08:53:21 -0600562}
563static DEVICE_ATTR_RW(driver_override);
564
Sachin Kamatbf22c902013-09-28 15:42:00 +0530565static struct attribute *pci_dev_attrs[] = {
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700566 &dev_attr_resource.attr,
567 &dev_attr_vendor.attr,
568 &dev_attr_device.attr,
569 &dev_attr_subsystem_vendor.attr,
570 &dev_attr_subsystem_device.attr,
571 &dev_attr_class.attr,
572 &dev_attr_irq.attr,
573 &dev_attr_local_cpus.attr,
574 &dev_attr_local_cpulist.attr,
575 &dev_attr_modalias.attr,
Brice Goglin81bb0e12007-01-28 10:53:40 +0100576#ifdef CONFIG_NUMA
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700577 &dev_attr_numa_node.attr,
Brice Goglin81bb0e12007-01-28 10:53:40 +0100578#endif
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700579 &dev_attr_dma_mask_bits.attr,
580 &dev_attr_consistent_dma_mask_bits.attr,
Greg Kroah-Hartmand8e7d532014-10-30 09:30:28 -0700581 &dev_attr_enable.attr,
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700582 &dev_attr_broken_parity_status.attr,
583 &dev_attr_msi_bus.attr,
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +0100584#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700585 &dev_attr_d3cold_allowed.attr,
Huang Ying448bd852012-06-23 10:23:51 +0800586#endif
Sebastian Ottdfc73e72014-04-17 19:46:15 +0200587#ifdef CONFIG_OF
588 &dev_attr_devspec.attr,
589#endif
Alex Williamson782a9852014-05-20 08:53:21 -0600590 &dev_attr_driver_override.attr,
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700591 NULL,
592};
593
594static const struct attribute_group pci_dev_group = {
595 .attrs = pci_dev_attrs,
596};
597
598const struct attribute_group *pci_dev_groups[] = {
599 &pci_dev_group,
600 NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601};
602
Greg Kroah-Hartman56039e62013-07-24 15:05:17 -0700603static struct attribute *pcibus_attrs[] = {
604 &dev_attr_rescan.attr,
605 &dev_attr_cpuaffinity.attr,
606 &dev_attr_cpulistaffinity.attr,
607 NULL,
608};
609
610static const struct attribute_group pcibus_group = {
611 .attrs = pcibus_attrs,
612};
613
614const struct attribute_group *pcibus_groups[] = {
615 &pcibus_group,
616 NULL,
Yinghai Lub9d320f2011-05-12 17:11:39 -0700617};
618
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400619static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
620 char *buf)
Dave Airlie217f45d2009-03-04 05:57:05 +0000621{
622 struct pci_dev *pdev = to_pci_dev(dev);
Matthew Garrett1a39b312012-04-16 16:26:02 -0400623 struct pci_dev *vga_dev = vga_default_device();
624
625 if (vga_dev)
626 return sprintf(buf, "%u\n", (pdev == vga_dev));
Dave Airlie217f45d2009-03-04 05:57:05 +0000627
628 return sprintf(buf, "%u\n",
629 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
630 IORESOURCE_ROM_SHADOW));
631}
Sachin Kamatbf22c902013-09-28 15:42:00 +0530632static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
Dave Airlie217f45d2009-03-04 05:57:05 +0000633
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400634static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
635 struct bin_attribute *bin_attr, char *buf,
636 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637{
Geliang Tang554a6032015-12-23 20:28:13 +0800638 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 unsigned int size = 64;
640 loff_t init_off = off;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400641 u8 *data = (u8 *) buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
643 /* Several chips lock up trying to read undefined config space */
Linus Torvaldsab0fa822016-04-14 12:00:21 -0700644 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 size = dev->cfg_size;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400646 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 size = 128;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
649 if (off > size)
650 return 0;
651 if (off + count > size) {
652 size -= off;
653 count = size;
654 } else {
655 size = count;
656 }
657
Huang Ying3d8387e2012-08-15 09:43:03 +0800658 pci_config_pm_runtime_get(dev);
659
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900660 if ((off & 1) && size) {
661 u8 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700662 pci_user_read_config_byte(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900663 data[off - init_off] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 off++;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900665 size--;
666 }
667
668 if ((off & 3) && size > 2) {
669 u16 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700670 pci_user_read_config_word(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900671 data[off - init_off] = val & 0xff;
672 data[off - init_off + 1] = (val >> 8) & 0xff;
673 off += 2;
674 size -= 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 }
676
677 while (size > 3) {
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900678 u32 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700679 pci_user_read_config_dword(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900680 data[off - init_off] = val & 0xff;
681 data[off - init_off + 1] = (val >> 8) & 0xff;
682 data[off - init_off + 2] = (val >> 16) & 0xff;
683 data[off - init_off + 3] = (val >> 24) & 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 off += 4;
685 size -= 4;
686 }
687
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900688 if (size >= 2) {
689 u16 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700690 pci_user_read_config_word(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900691 data[off - init_off] = val & 0xff;
692 data[off - init_off + 1] = (val >> 8) & 0xff;
693 off += 2;
694 size -= 2;
695 }
696
697 if (size > 0) {
698 u8 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700699 pci_user_read_config_byte(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900700 data[off - init_off] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 off++;
702 --size;
703 }
704
Huang Ying3d8387e2012-08-15 09:43:03 +0800705 pci_config_pm_runtime_put(dev);
706
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 return count;
708}
709
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400710static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
711 struct bin_attribute *bin_attr, char *buf,
712 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713{
Geliang Tang554a6032015-12-23 20:28:13 +0800714 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 unsigned int size = count;
716 loff_t init_off = off;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400717 u8 *data = (u8 *) buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718
719 if (off > dev->cfg_size)
720 return 0;
721 if (off + count > dev->cfg_size) {
722 size = dev->cfg_size - off;
723 count = size;
724 }
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700725
Huang Ying3d8387e2012-08-15 09:43:03 +0800726 pci_config_pm_runtime_get(dev);
727
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900728 if ((off & 1) && size) {
Brian Kinge04b0ea2005-09-27 01:21:55 -0700729 pci_user_write_config_byte(dev, off, data[off - init_off]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 off++;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900731 size--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 }
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700733
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900734 if ((off & 3) && size > 2) {
735 u16 val = data[off - init_off];
736 val |= (u16) data[off - init_off + 1] << 8;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400737 pci_user_write_config_word(dev, off, val);
738 off += 2;
739 size -= 2;
740 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741
742 while (size > 3) {
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900743 u32 val = data[off - init_off];
744 val |= (u32) data[off - init_off + 1] << 8;
745 val |= (u32) data[off - init_off + 2] << 16;
746 val |= (u32) data[off - init_off + 3] << 24;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700747 pci_user_write_config_dword(dev, off, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 off += 4;
749 size -= 4;
750 }
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700751
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900752 if (size >= 2) {
753 u16 val = data[off - init_off];
754 val |= (u16) data[off - init_off + 1] << 8;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700755 pci_user_write_config_word(dev, off, val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900756 off += 2;
757 size -= 2;
758 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900760 if (size) {
Brian Kinge04b0ea2005-09-27 01:21:55 -0700761 pci_user_write_config_byte(dev, off, data[off - init_off]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 off++;
763 --size;
764 }
765
Huang Ying3d8387e2012-08-15 09:43:03 +0800766 pci_config_pm_runtime_put(dev);
767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 return count;
769}
770
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400771static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
772 struct bin_attribute *bin_attr, char *buf,
773 loff_t off, size_t count)
Ben Hutchings94e61082008-03-05 16:52:39 +0000774{
Geliang Tang554a6032015-12-23 20:28:13 +0800775 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
Ben Hutchings94e61082008-03-05 16:52:39 +0000776
Hannes Reineckef52e5622016-02-15 09:42:00 +0100777 if (bin_attr->size > 0) {
778 if (off > bin_attr->size)
779 count = 0;
780 else if (count > bin_attr->size - off)
781 count = bin_attr->size - off;
782 }
Ben Hutchings94e61082008-03-05 16:52:39 +0000783
Stephen Hemminger287d19c2008-12-18 09:17:16 -0800784 return pci_read_vpd(dev, off, count, buf);
785}
Ben Hutchings94e61082008-03-05 16:52:39 +0000786
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400787static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
788 struct bin_attribute *bin_attr, char *buf,
789 loff_t off, size_t count)
Stephen Hemminger287d19c2008-12-18 09:17:16 -0800790{
Geliang Tang554a6032015-12-23 20:28:13 +0800791 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
Stephen Hemminger287d19c2008-12-18 09:17:16 -0800792
Hannes Reineckef52e5622016-02-15 09:42:00 +0100793 if (bin_attr->size > 0) {
794 if (off > bin_attr->size)
795 count = 0;
796 else if (count > bin_attr->size - off)
797 count = bin_attr->size - off;
798 }
Stephen Hemminger287d19c2008-12-18 09:17:16 -0800799
800 return pci_write_vpd(dev, off, count, buf);
Ben Hutchings94e61082008-03-05 16:52:39 +0000801}
802
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803#ifdef HAVE_PCI_LEGACY
804/**
805 * pci_read_legacy_io - read byte(s) from legacy I/O port space
Chris Wright2c3c8be2010-05-12 18:28:57 -0700806 * @filp: open sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 * @kobj: kobject corresponding to file to read from
Randy Dunlapcffb2fa2009-04-10 15:17:50 -0700808 * @bin_attr: struct bin_attribute for this file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 * @buf: buffer to store results
810 * @off: offset into legacy I/O port space
811 * @count: number of bytes to read
812 *
813 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
814 * callback routine (pci_legacy_read).
815 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400816static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
817 struct bin_attribute *bin_attr, char *buf,
818 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819{
Geliang Tang554a6032015-12-23 20:28:13 +0800820 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400822 /* Only support 1, 2 or 4 byte accesses */
823 if (count != 1 && count != 2 && count != 4)
824 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400826 return pci_legacy_read(bus, off, (u32 *)buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827}
828
829/**
830 * pci_write_legacy_io - write byte(s) to legacy I/O port space
Chris Wright2c3c8be2010-05-12 18:28:57 -0700831 * @filp: open sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 * @kobj: kobject corresponding to file to read from
Randy Dunlapcffb2fa2009-04-10 15:17:50 -0700833 * @bin_attr: struct bin_attribute for this file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 * @buf: buffer containing value to be written
835 * @off: offset into legacy I/O port space
836 * @count: number of bytes to write
837 *
838 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
839 * callback routine (pci_legacy_write).
840 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400841static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
842 struct bin_attribute *bin_attr, char *buf,
843 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844{
Geliang Tang554a6032015-12-23 20:28:13 +0800845 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400847 /* Only support 1, 2 or 4 byte accesses */
848 if (count != 1 && count != 2 && count != 4)
849 return -EINVAL;
850
851 return pci_legacy_write(bus, off, *(u32 *)buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852}
853
854/**
855 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
Chris Wright2c3c8be2010-05-12 18:28:57 -0700856 * @filp: open sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 * @kobj: kobject corresponding to device to be mapped
858 * @attr: struct bin_attribute for this file
859 * @vma: struct vm_area_struct passed to mmap
860 *
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000861 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 * legacy memory space (first meg of bus space) into application virtual
863 * memory space.
864 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400865static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
866 struct bin_attribute *attr,
867 struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868{
Geliang Tang554a6032015-12-23 20:28:13 +0800869 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400871 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000872}
873
874/**
875 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
Chris Wright2c3c8be2010-05-12 18:28:57 -0700876 * @filp: open sysfs file
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000877 * @kobj: kobject corresponding to device to be mapped
878 * @attr: struct bin_attribute for this file
879 * @vma: struct vm_area_struct passed to mmap
880 *
881 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
882 * legacy IO space (first meg of bus space) into application virtual
883 * memory space. Returns -ENOSYS if the operation isn't supported
884 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400885static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
886 struct bin_attribute *attr,
887 struct vm_area_struct *vma)
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000888{
Geliang Tang554a6032015-12-23 20:28:13 +0800889 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000890
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400891 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000892}
893
894/**
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300895 * pci_adjust_legacy_attr - adjustment of legacy file attributes
896 * @b: bus to create files under
897 * @mmap_type: I/O port or memory
898 *
899 * Stub implementation. Can be overridden by arch if necessary.
900 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400901void __weak pci_adjust_legacy_attr(struct pci_bus *b,
902 enum pci_mmap_state mmap_type)
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300903{
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300904}
905
906/**
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000907 * pci_create_legacy_files - create legacy I/O port and memory files
908 * @b: bus to create files under
909 *
910 * Some platforms allow access to legacy I/O port and ISA memory space on
911 * a per-bus basis. This routine creates the files and ties them into
912 * their associated read, write and mmap files from pci-sysfs.c
913 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300914 * On error unwind, but don't propagate the error to the caller
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000915 * as it is ok to set up the PCI bus without these files.
916 */
917void pci_create_legacy_files(struct pci_bus *b)
918{
919 int error;
920
921 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
922 GFP_ATOMIC);
923 if (!b->legacy_io)
924 goto kzalloc_err;
925
Stephen Rothwell62e877b82010-03-01 20:38:36 +1100926 sysfs_bin_attr_init(b->legacy_io);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000927 b->legacy_io->attr.name = "legacy_io";
928 b->legacy_io->size = 0xffff;
929 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
930 b->legacy_io->read = pci_read_legacy_io;
931 b->legacy_io->write = pci_write_legacy_io;
932 b->legacy_io->mmap = pci_mmap_legacy_io;
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300933 pci_adjust_legacy_attr(b, pci_mmap_io);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000934 error = device_create_bin_file(&b->dev, b->legacy_io);
935 if (error)
936 goto legacy_io_err;
937
938 /* Allocated above after the legacy_io struct */
939 b->legacy_mem = b->legacy_io + 1;
Mel Gorman6757eca32010-03-10 22:48:34 +0000940 sysfs_bin_attr_init(b->legacy_mem);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000941 b->legacy_mem->attr.name = "legacy_mem";
942 b->legacy_mem->size = 1024*1024;
943 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
944 b->legacy_mem->mmap = pci_mmap_legacy_mem;
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300945 pci_adjust_legacy_attr(b, pci_mmap_mem);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000946 error = device_create_bin_file(&b->dev, b->legacy_mem);
947 if (error)
948 goto legacy_mem_err;
949
950 return;
951
952legacy_mem_err:
953 device_remove_bin_file(&b->dev, b->legacy_io);
954legacy_io_err:
955 kfree(b->legacy_io);
956 b->legacy_io = NULL;
957kzalloc_err:
Ryan Desfosses227f0642014-04-18 20:13:50 -0400958 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 +1000959 return;
960}
961
962void pci_remove_legacy_files(struct pci_bus *b)
963{
964 if (b->legacy_io) {
965 device_remove_bin_file(&b->dev, b->legacy_io);
966 device_remove_bin_file(&b->dev, b->legacy_mem);
967 kfree(b->legacy_io); /* both are allocated here */
968 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969}
970#endif /* HAVE_PCI_LEGACY */
971
972#ifdef HAVE_PCI_MMAP
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700973
Martin Wilck3b519e42010-11-10 11:03:21 +0100974int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
975 enum pci_mmap_api mmap_api)
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700976{
Martin Wilck3b519e42010-11-10 11:03:21 +0100977 unsigned long nr, start, size, pci_start;
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700978
Martin Wilck3b519e42010-11-10 11:03:21 +0100979 if (pci_resource_len(pdev, resno) == 0)
980 return 0;
Libin64b00172013-04-15 02:48:54 +0000981 nr = vma_pages(vma);
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700982 start = vma->vm_pgoff;
Ed Swierk88e7df02008-11-03 14:41:16 -0800983 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
Darrick J. Wong8c05cd02010-11-16 09:13:41 -0800984 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
Martin Wilck3b519e42010-11-10 11:03:21 +0100985 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
986 if (start >= pci_start && start < pci_start + size &&
987 start + nr <= pci_start + size)
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700988 return 1;
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700989 return 0;
990}
991
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992/**
993 * pci_mmap_resource - map a PCI resource into user memory space
994 * @kobj: kobject for mapping
995 * @attr: struct bin_attribute for the file being mapped
996 * @vma: struct vm_area_struct passed into the mmap
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700997 * @write_combine: 1 for write_combine mapping
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 *
999 * Use the regular PCI mapping routines to map a PCI resource into userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001001static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1002 struct vm_area_struct *vma, int write_combine)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003{
Geliang Tang554a6032015-12-23 20:28:13 +08001004 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
Kulikov Vasiliya3f58352010-06-29 14:15:28 +04001005 struct resource *res = attr->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 enum pci_mmap_state mmap_type;
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -07001007 resource_size_t start, end;
Michael Ellerman2311b1f2005-05-13 17:44:10 +10001008 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009
Michael Ellerman2311b1f2005-05-13 17:44:10 +10001010 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1011 if (res == &pdev->resource[i])
1012 break;
1013 if (i >= PCI_ROM_RESOURCE)
1014 return -ENODEV;
1015
Bjorn Helgaasca620722016-04-07 17:15:14 -07001016 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1017 return -EINVAL;
1018
Martin Wilck3b519e42010-11-10 11:03:21 +01001019 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
Ryan Desfosses227f0642014-04-18 20:13:50 -04001020 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 +01001021 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
1022 pci_name(pdev), i,
Randy Dunlape25cd062010-11-13 08:44:33 -08001023 (u64)pci_resource_start(pdev, i),
1024 (u64)pci_resource_len(pdev, i));
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -07001025 return -EINVAL;
Martin Wilck3b519e42010-11-10 11:03:21 +01001026 }
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -07001027
Michael Ellerman2311b1f2005-05-13 17:44:10 +10001028 /* pci_mmap_page_range() expects the same kind of entry as coming
1029 * from /proc/bus/pci/ which is a "user visible" value. If this is
1030 * different from the resource itself, arch will do necessary fixup.
1031 */
1032 pci_resource_to_user(pdev, i, res, &start, &end);
1033 vma->vm_pgoff += start >> PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001035 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1036}
1037
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001038static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1039 struct bin_attribute *attr,
1040 struct vm_area_struct *vma)
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001041{
1042 return pci_mmap_resource(kobj, attr, vma, 0);
1043}
1044
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001045static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1046 struct bin_attribute *attr,
1047 struct vm_area_struct *vma)
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001048{
1049 return pci_mmap_resource(kobj, attr, vma, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050}
1051
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001052static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1053 struct bin_attribute *attr, char *buf,
1054 loff_t off, size_t count, bool write)
Alex Williamson86333282010-07-19 09:45:34 -06001055{
Geliang Tang554a6032015-12-23 20:28:13 +08001056 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
Alex Williamson86333282010-07-19 09:45:34 -06001057 struct resource *res = attr->private;
1058 unsigned long port = off;
1059 int i;
1060
1061 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1062 if (res == &pdev->resource[i])
1063 break;
1064 if (i >= PCI_ROM_RESOURCE)
1065 return -ENODEV;
1066
1067 port += pci_resource_start(pdev, i);
1068
1069 if (port > pci_resource_end(pdev, i))
1070 return 0;
1071
1072 if (port + count - 1 > pci_resource_end(pdev, i))
1073 return -EINVAL;
1074
1075 switch (count) {
1076 case 1:
1077 if (write)
1078 outb(*(u8 *)buf, port);
1079 else
1080 *(u8 *)buf = inb(port);
1081 return 1;
1082 case 2:
1083 if (write)
1084 outw(*(u16 *)buf, port);
1085 else
1086 *(u16 *)buf = inw(port);
1087 return 2;
1088 case 4:
1089 if (write)
1090 outl(*(u32 *)buf, port);
1091 else
1092 *(u32 *)buf = inl(port);
1093 return 4;
1094 }
1095 return -EINVAL;
1096}
1097
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001098static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1099 struct bin_attribute *attr, char *buf,
1100 loff_t off, size_t count)
Alex Williamson86333282010-07-19 09:45:34 -06001101{
1102 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1103}
1104
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001105static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1106 struct bin_attribute *attr, char *buf,
1107 loff_t off, size_t count)
Alex Williamson86333282010-07-19 09:45:34 -06001108{
1109 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1110}
1111
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112/**
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001113 * pci_remove_resource_files - cleanup resource files
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001114 * @pdev: dev to cleanup
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001115 *
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001116 * If we created resource files for @pdev, remove them from sysfs and
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001117 * free their resources.
1118 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001119static void pci_remove_resource_files(struct pci_dev *pdev)
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001120{
1121 int i;
1122
1123 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1124 struct bin_attribute *res_attr;
1125
1126 res_attr = pdev->res_attr[i];
1127 if (res_attr) {
1128 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1129 kfree(res_attr);
1130 }
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001131
1132 res_attr = pdev->res_attr_wc[i];
1133 if (res_attr) {
1134 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1135 kfree(res_attr);
1136 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001137 }
1138}
1139
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001140static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1141{
1142 /* allocate attribute structure, piggyback attribute name */
1143 int name_len = write_combine ? 13 : 10;
1144 struct bin_attribute *res_attr;
Bjorn Helgaasbd5174d2016-03-10 14:36:34 -06001145 char *res_attr_name;
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001146 int retval;
1147
1148 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
Bjorn Helgaasbd5174d2016-03-10 14:36:34 -06001149 if (!res_attr)
1150 return -ENOMEM;
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001151
Bjorn Helgaasbd5174d2016-03-10 14:36:34 -06001152 res_attr_name = (char *)(res_attr + 1);
1153
1154 sysfs_bin_attr_init(res_attr);
1155 if (write_combine) {
1156 pdev->res_attr_wc[num] = res_attr;
1157 sprintf(res_attr_name, "resource%d_wc", num);
1158 res_attr->mmap = pci_mmap_resource_wc;
1159 } else {
1160 pdev->res_attr[num] = res_attr;
1161 sprintf(res_attr_name, "resource%d", num);
1162 res_attr->mmap = pci_mmap_resource_uc;
1163 }
1164 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1165 res_attr->read = pci_read_resource_io;
1166 res_attr->write = pci_write_resource_io;
1167 }
1168 res_attr->attr.name = res_attr_name;
1169 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1170 res_attr->size = pci_resource_len(pdev, num);
1171 res_attr->private = &pdev->resource[num];
1172 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1173 if (retval)
1174 kfree(res_attr);
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001175
1176 return retval;
1177}
1178
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001179/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 * pci_create_resource_files - create resource files in sysfs for @dev
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001181 * @pdev: dev in question
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 *
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001183 * Walk the resources in @pdev creating files for each resource available.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 */
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001185static int pci_create_resource_files(struct pci_dev *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186{
1187 int i;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001188 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189
1190 /* Expose the PCI resources from this device as files */
1191 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192
1193 /* skip empty resources */
1194 if (!pci_resource_len(pdev, i))
1195 continue;
1196
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001197 retval = pci_create_attr(pdev, i, 0);
1198 /* for prefetchable resources, create a WC mappable file */
1199 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1200 retval = pci_create_attr(pdev, i, 1);
Dmitry Torokhovd48593b2005-04-29 00:58:46 -05001201
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001202 if (retval) {
1203 pci_remove_resource_files(pdev);
1204 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 }
1206 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001207 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208}
1209#else /* !HAVE_PCI_MMAP */
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +03001210int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1211void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212#endif /* HAVE_PCI_MMAP */
1213
1214/**
1215 * pci_write_rom - used to enable access to the PCI ROM display
Chris Wright2c3c8be2010-05-12 18:28:57 -07001216 * @filp: sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 * @kobj: kernel object handle
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001218 * @bin_attr: struct bin_attribute for this file
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 * @buf: user input
1220 * @off: file offset
1221 * @count: number of byte in input
1222 *
1223 * writing anything except 0 enables it
1224 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001225static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1226 struct bin_attribute *bin_attr, char *buf,
1227 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228{
Geliang Tang554a6032015-12-23 20:28:13 +08001229 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230
1231 if ((off == 0) && (*buf == '0') && (count == 2))
1232 pdev->rom_attr_enabled = 0;
1233 else
1234 pdev->rom_attr_enabled = 1;
1235
1236 return count;
1237}
1238
1239/**
1240 * pci_read_rom - read a PCI ROM
Chris Wright2c3c8be2010-05-12 18:28:57 -07001241 * @filp: sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 * @kobj: kernel object handle
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001243 * @bin_attr: struct bin_attribute for this file
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 * @buf: where to put the data we read from the ROM
1245 * @off: file offset
1246 * @count: number of bytes to read
1247 *
1248 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1249 * device corresponding to @kobj.
1250 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001251static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1252 struct bin_attribute *bin_attr, char *buf,
1253 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254{
Geliang Tang554a6032015-12-23 20:28:13 +08001255 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 void __iomem *rom;
1257 size_t size;
1258
1259 if (!pdev->rom_attr_enabled)
1260 return -EINVAL;
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001261
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
Timothy S. Nelson97c44832009-01-30 06:12:47 +11001263 if (!rom || !size)
1264 return -EIO;
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001265
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 if (off >= size)
1267 count = 0;
1268 else {
1269 if (off + count > size)
1270 count = size - off;
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001271
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 memcpy_fromio(buf, rom + off, count);
1273 }
1274 pci_unmap_rom(pdev, rom);
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001275
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 return count;
1277}
1278
1279static struct bin_attribute pci_config_attr = {
1280 .attr = {
1281 .name = "config",
1282 .mode = S_IRUGO | S_IWUSR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 },
Zhao, Yu557848c2008-10-13 19:18:07 +08001284 .size = PCI_CFG_SPACE_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 .read = pci_read_config,
1286 .write = pci_write_config,
1287};
1288
1289static struct bin_attribute pcie_config_attr = {
1290 .attr = {
1291 .name = "config",
1292 .mode = S_IRUGO | S_IWUSR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 },
Zhao, Yu557848c2008-10-13 19:18:07 +08001294 .size = PCI_CFG_SPACE_EXP_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 .read = pci_read_config,
1296 .write = pci_write_config,
1297};
1298
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001299static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1300 const char *buf, size_t count)
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001301{
1302 struct pci_dev *pdev = to_pci_dev(dev);
1303 unsigned long val;
Jingoo Han9a994e82013-06-01 16:25:25 +09001304 ssize_t result = kstrtoul(buf, 0, &val);
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001305
1306 if (result < 0)
1307 return result;
1308
1309 if (val != 1)
1310 return -EINVAL;
Michal Schmidt447c5dd2010-05-11 11:44:54 +02001311
1312 result = pci_reset_function(pdev);
1313 if (result < 0)
1314 return result;
1315
1316 return count;
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001317}
1318
1319static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1320
Zhao, Yu280c73d2008-10-13 20:01:00 +08001321static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1322{
1323 int retval;
1324 struct bin_attribute *attr;
1325
1326 /* If the device has VPD, try to expose it in sysfs. */
1327 if (dev->vpd) {
1328 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1329 if (!attr)
1330 return -ENOMEM;
1331
Eric W. Biedermana07e4152010-02-11 15:23:05 -08001332 sysfs_bin_attr_init(attr);
Hannes Reinecke104daa72016-02-15 09:42:01 +01001333 attr->size = 0;
Zhao, Yu280c73d2008-10-13 20:01:00 +08001334 attr->attr.name = "vpd";
1335 attr->attr.mode = S_IRUSR | S_IWUSR;
Stephen Hemminger287d19c2008-12-18 09:17:16 -08001336 attr->read = read_vpd_attr;
1337 attr->write = write_vpd_attr;
Zhao, Yu280c73d2008-10-13 20:01:00 +08001338 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1339 if (retval) {
Ben Hutchings0f12a4e2011-01-13 19:47:56 +00001340 kfree(attr);
Zhao, Yu280c73d2008-10-13 20:01:00 +08001341 return retval;
1342 }
1343 dev->vpd->attr = attr;
1344 }
1345
1346 /* Active State Power Management */
1347 pcie_aspm_create_sysfs_dev_files(dev);
1348
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001349 if (!pci_probe_reset_function(dev)) {
1350 retval = device_create_file(&dev->dev, &reset_attr);
1351 if (retval)
1352 goto error;
1353 dev->reset_fn = 1;
1354 }
Zhao, Yu280c73d2008-10-13 20:01:00 +08001355 return 0;
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001356
1357error:
1358 pcie_aspm_remove_sysfs_dev_files(dev);
1359 if (dev->vpd && dev->vpd->attr) {
1360 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1361 kfree(dev->vpd->attr);
1362 }
1363
1364 return retval;
Zhao, Yu280c73d2008-10-13 20:01:00 +08001365}
1366
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001367int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368{
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001369 int retval;
Bjorn Helgaasac0c3022016-03-12 05:48:08 -06001370 int rom_size;
Zhao, Yu280c73d2008-10-13 20:01:00 +08001371 struct bin_attribute *attr;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001372
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 if (!sysfs_initialized)
1374 return -EACCES;
1375
Jason S. McMullanc20aecf2015-09-30 15:35:05 +09001376 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001377 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
Jason S. McMullanc20aecf2015-09-30 15:35:05 +09001378 else
1379 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001380 if (retval)
1381 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001383 retval = pci_create_resource_files(pdev);
1384 if (retval)
Zhao, Yu280c73d2008-10-13 20:01:00 +08001385 goto err_config_file;
1386
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387 /* If the device has a ROM, try to expose it in sysfs. */
Bjorn Helgaasac0c3022016-03-12 05:48:08 -06001388 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
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:
Bjorn Helgaas9d88b932016-03-01 09:37:10 -06001419 if (pdev->rom_attr) {
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:
Jason S. McMullanc20aecf2015-09-30 15:35:05 +09001427 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001428 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
Jason S. McMullanc20aecf2015-09-30 15:35:05 +09001429 else
1430 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001431err:
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{
David Millerd67afe52006-11-10 12:27:48 -08001457 if (!sysfs_initialized)
1458 return;
1459
Zhao, Yu280c73d2008-10-13 20:01:00 +08001460 pci_remove_capabilities_sysfs(pdev);
Shaohua Li7d715a62008-02-25 09:46:41 +08001461
Jason S. McMullanc20aecf2015-09-30 15:35:05 +09001462 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
Jason S. McMullanc20aecf2015-09-30 15:35:05 +09001464 else
1465 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466
1467 pci_remove_resource_files(pdev);
1468
Bjorn Helgaas9d88b932016-03-01 09:37:10 -06001469 if (pdev->rom_attr) {
Zhao, Yu280c73d2008-10-13 20:01:00 +08001470 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1471 kfree(pdev->rom_attr);
Bjorn Helgaas9d88b932016-03-01 09:37:10 -06001472 pdev->rom_attr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 }
Narendra K911e1c92010-07-26 05:56:50 -05001474
1475 pci_remove_firmware_label_files(pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476}
1477
1478static int __init pci_sysfs_init(void)
1479{
1480 struct pci_dev *pdev = NULL;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001481 int retval;
1482
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 sysfs_initialized = 1;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001484 for_each_pci_dev(pdev) {
1485 retval = pci_create_sysfs_dev_files(pdev);
Julia Lawall151fc5d2007-11-20 08:41:16 +01001486 if (retval) {
1487 pci_dev_put(pdev);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001488 return retval;
Julia Lawall151fc5d2007-11-20 08:41:16 +01001489 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001490 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491
1492 return 0;
1493}
Jesse Barnes40ee9e92007-03-24 11:03:32 -07001494late_initcall(pci_sysfs_init);
Yinghai Lu4e15c462012-11-05 15:20:34 -05001495
1496static struct attribute *pci_dev_dev_attrs[] = {
Yinghai Lu625e1d52012-11-05 15:20:35 -05001497 &vga_attr.attr,
Yinghai Lu4e15c462012-11-05 15:20:34 -05001498 NULL,
1499};
1500
1501static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001502 struct attribute *a, int n)
Yinghai Lu4e15c462012-11-05 15:20:34 -05001503{
Geliang Tang554a6032015-12-23 20:28:13 +08001504 struct device *dev = kobj_to_dev(kobj);
Yinghai Lu625e1d52012-11-05 15:20:35 -05001505 struct pci_dev *pdev = to_pci_dev(dev);
1506
1507 if (a == &vga_attr.attr)
1508 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1509 return 0;
1510
Yinghai Lu4e15c462012-11-05 15:20:34 -05001511 return a->mode;
1512}
1513
Jiang Liudfab88b2013-05-31 12:21:31 +08001514static struct attribute *pci_dev_hp_attrs[] = {
1515 &dev_remove_attr.attr,
1516 &dev_rescan_attr.attr,
1517 NULL,
1518};
1519
1520static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001521 struct attribute *a, int n)
Jiang Liudfab88b2013-05-31 12:21:31 +08001522{
Geliang Tang554a6032015-12-23 20:28:13 +08001523 struct device *dev = kobj_to_dev(kobj);
Jiang Liudfab88b2013-05-31 12:21:31 +08001524 struct pci_dev *pdev = to_pci_dev(dev);
1525
1526 if (pdev->is_virtfn)
1527 return 0;
1528
1529 return a->mode;
1530}
1531
1532static struct attribute_group pci_dev_hp_attr_group = {
1533 .attrs = pci_dev_hp_attrs,
1534 .is_visible = pci_dev_hp_attrs_are_visible,
1535};
1536
Donald Dutile17893822012-11-05 15:20:36 -05001537#ifdef CONFIG_PCI_IOV
1538static struct attribute *sriov_dev_attrs[] = {
1539 &sriov_totalvfs_attr.attr,
1540 &sriov_numvfs_attr.attr,
1541 NULL,
1542};
1543
1544static umode_t sriov_attrs_are_visible(struct kobject *kobj,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001545 struct attribute *a, int n)
Donald Dutile17893822012-11-05 15:20:36 -05001546{
Geliang Tang554a6032015-12-23 20:28:13 +08001547 struct device *dev = kobj_to_dev(kobj);
Donald Dutile17893822012-11-05 15:20:36 -05001548
1549 if (!dev_is_pf(dev))
1550 return 0;
1551
1552 return a->mode;
1553}
1554
1555static struct attribute_group sriov_dev_attr_group = {
1556 .attrs = sriov_dev_attrs,
1557 .is_visible = sriov_attrs_are_visible,
1558};
1559#endif /* CONFIG_PCI_IOV */
1560
Yinghai Lu4e15c462012-11-05 15:20:34 -05001561static struct attribute_group pci_dev_attr_group = {
1562 .attrs = pci_dev_dev_attrs,
1563 .is_visible = pci_dev_attrs_are_visible,
1564};
1565
1566static const struct attribute_group *pci_dev_attr_groups[] = {
1567 &pci_dev_attr_group,
Jiang Liudfab88b2013-05-31 12:21:31 +08001568 &pci_dev_hp_attr_group,
Donald Dutile17893822012-11-05 15:20:36 -05001569#ifdef CONFIG_PCI_IOV
1570 &sriov_dev_attr_group,
1571#endif
Yinghai Lu4e15c462012-11-05 15:20:34 -05001572 NULL,
1573};
1574
1575struct device_type pci_dev_type = {
1576 .groups = pci_dev_attr_groups,
1577};