blob: eead54cd01b2bfad6a5514f53067429e616db6b7 [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;
409 pm_runtime_resume(dev);
410
411 return count;
412}
413
414static ssize_t d3cold_allowed_show(struct device *dev,
415 struct device_attribute *attr, char *buf)
416{
417 struct pci_dev *pdev = to_pci_dev(dev);
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400418 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
Huang Ying448bd852012-06-23 10:23:51 +0800419}
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700420static DEVICE_ATTR_RW(d3cold_allowed);
Huang Ying448bd852012-06-23 10:23:51 +0800421#endif
422
Sebastian Ottdfc73e72014-04-17 19:46:15 +0200423#ifdef CONFIG_OF
424static ssize_t devspec_show(struct device *dev,
425 struct device_attribute *attr, char *buf)
426{
427 struct pci_dev *pdev = to_pci_dev(dev);
428 struct device_node *np = pci_device_to_OF_node(pdev);
429
430 if (np == NULL || np->full_name == NULL)
431 return 0;
432 return sprintf(buf, "%s", np->full_name);
433}
434static DEVICE_ATTR_RO(devspec);
435#endif
436
Donald Dutile17893822012-11-05 15:20:36 -0500437#ifdef CONFIG_PCI_IOV
438static ssize_t sriov_totalvfs_show(struct device *dev,
439 struct device_attribute *attr,
440 char *buf)
441{
442 struct pci_dev *pdev = to_pci_dev(dev);
443
Donald Dutilebff73152012-11-05 15:20:37 -0500444 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
Donald Dutile17893822012-11-05 15:20:36 -0500445}
446
447
448static ssize_t sriov_numvfs_show(struct device *dev,
449 struct device_attribute *attr,
450 char *buf)
451{
452 struct pci_dev *pdev = to_pci_dev(dev);
453
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700454 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
Donald Dutile17893822012-11-05 15:20:36 -0500455}
456
457/*
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700458 * num_vfs > 0; number of VFs to enable
459 * num_vfs = 0; disable all VFs
Donald Dutile17893822012-11-05 15:20:36 -0500460 *
461 * Note: SRIOV spec doesn't allow partial VF
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700462 * disable, so it's all or none.
Donald Dutile17893822012-11-05 15:20:36 -0500463 */
464static ssize_t sriov_numvfs_store(struct device *dev,
465 struct device_attribute *attr,
466 const char *buf, size_t count)
467{
468 struct pci_dev *pdev = to_pci_dev(dev);
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700469 int ret;
470 u16 num_vfs;
Donald Dutile17893822012-11-05 15:20:36 -0500471
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700472 ret = kstrtou16(buf, 0, &num_vfs);
473 if (ret < 0)
474 return ret;
475
476 if (num_vfs > pci_sriov_get_totalvfs(pdev))
477 return -ERANGE;
478
479 if (num_vfs == pdev->sriov->num_VFs)
480 return count; /* no change */
Donald Dutile17893822012-11-05 15:20:36 -0500481
482 /* is PF driver loaded w/callback */
483 if (!pdev->driver || !pdev->driver->sriov_configure) {
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700484 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
Donald Dutile17893822012-11-05 15:20:36 -0500485 return -ENOSYS;
486 }
487
Donald Dutile17893822012-11-05 15:20:36 -0500488 if (num_vfs == 0) {
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700489 /* disable VFs */
490 ret = pdev->driver->sriov_configure(pdev, 0);
491 if (ret < 0)
492 return ret;
493 return count;
Donald Dutile17893822012-11-05 15:20:36 -0500494 }
495
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700496 /* enable VFs */
497 if (pdev->sriov->num_VFs) {
498 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
499 pdev->sriov->num_VFs, num_vfs);
500 return -EBUSY;
501 }
Donald Dutile17893822012-11-05 15:20:36 -0500502
Bjorn Helgaasfaa48a52012-12-26 10:39:22 -0700503 ret = pdev->driver->sriov_configure(pdev, num_vfs);
504 if (ret < 0)
505 return ret;
506
507 if (ret != num_vfs)
508 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
509 num_vfs, ret);
510
511 return count;
Donald Dutile17893822012-11-05 15:20:36 -0500512}
513
514static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
515static struct device_attribute sriov_numvfs_attr =
516 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
517 sriov_numvfs_show, sriov_numvfs_store);
518#endif /* CONFIG_PCI_IOV */
519
Alex Williamson782a9852014-05-20 08:53:21 -0600520static ssize_t driver_override_store(struct device *dev,
521 struct device_attribute *attr,
522 const char *buf, size_t count)
523{
524 struct pci_dev *pdev = to_pci_dev(dev);
525 char *driver_override, *old = pdev->driver_override, *cp;
526
Sasha Levin4efe8742015-02-04 17:38:15 -0500527 /* We need to keep extra room for a newline */
528 if (count >= (PAGE_SIZE - 1))
Alex Williamson782a9852014-05-20 08:53:21 -0600529 return -EINVAL;
530
531 driver_override = kstrndup(buf, count, GFP_KERNEL);
532 if (!driver_override)
533 return -ENOMEM;
534
535 cp = strchr(driver_override, '\n');
536 if (cp)
537 *cp = '\0';
538
539 if (strlen(driver_override)) {
540 pdev->driver_override = driver_override;
541 } else {
542 kfree(driver_override);
543 pdev->driver_override = NULL;
544 }
545
546 kfree(old);
547
548 return count;
549}
550
551static ssize_t driver_override_show(struct device *dev,
552 struct device_attribute *attr, char *buf)
553{
554 struct pci_dev *pdev = to_pci_dev(dev);
555
Sasha Levin4efe8742015-02-04 17:38:15 -0500556 return snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
Alex Williamson782a9852014-05-20 08:53:21 -0600557}
558static DEVICE_ATTR_RW(driver_override);
559
Sachin Kamatbf22c902013-09-28 15:42:00 +0530560static struct attribute *pci_dev_attrs[] = {
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700561 &dev_attr_resource.attr,
562 &dev_attr_vendor.attr,
563 &dev_attr_device.attr,
564 &dev_attr_subsystem_vendor.attr,
565 &dev_attr_subsystem_device.attr,
566 &dev_attr_class.attr,
567 &dev_attr_irq.attr,
568 &dev_attr_local_cpus.attr,
569 &dev_attr_local_cpulist.attr,
570 &dev_attr_modalias.attr,
Brice Goglin81bb0e12007-01-28 10:53:40 +0100571#ifdef CONFIG_NUMA
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700572 &dev_attr_numa_node.attr,
Brice Goglin81bb0e12007-01-28 10:53:40 +0100573#endif
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700574 &dev_attr_dma_mask_bits.attr,
575 &dev_attr_consistent_dma_mask_bits.attr,
Greg Kroah-Hartmand8e7d532014-10-30 09:30:28 -0700576 &dev_attr_enable.attr,
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700577 &dev_attr_broken_parity_status.attr,
578 &dev_attr_msi_bus.attr,
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +0100579#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700580 &dev_attr_d3cold_allowed.attr,
Huang Ying448bd852012-06-23 10:23:51 +0800581#endif
Sebastian Ottdfc73e72014-04-17 19:46:15 +0200582#ifdef CONFIG_OF
583 &dev_attr_devspec.attr,
584#endif
Alex Williamson782a9852014-05-20 08:53:21 -0600585 &dev_attr_driver_override.attr,
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -0700586 NULL,
587};
588
589static const struct attribute_group pci_dev_group = {
590 .attrs = pci_dev_attrs,
591};
592
593const struct attribute_group *pci_dev_groups[] = {
594 &pci_dev_group,
595 NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596};
597
Greg Kroah-Hartman56039e62013-07-24 15:05:17 -0700598static struct attribute *pcibus_attrs[] = {
599 &dev_attr_rescan.attr,
600 &dev_attr_cpuaffinity.attr,
601 &dev_attr_cpulistaffinity.attr,
602 NULL,
603};
604
605static const struct attribute_group pcibus_group = {
606 .attrs = pcibus_attrs,
607};
608
609const struct attribute_group *pcibus_groups[] = {
610 &pcibus_group,
611 NULL,
Yinghai Lub9d320f2011-05-12 17:11:39 -0700612};
613
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400614static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
615 char *buf)
Dave Airlie217f45d2009-03-04 05:57:05 +0000616{
617 struct pci_dev *pdev = to_pci_dev(dev);
Matthew Garrett1a39b312012-04-16 16:26:02 -0400618 struct pci_dev *vga_dev = vga_default_device();
619
620 if (vga_dev)
621 return sprintf(buf, "%u\n", (pdev == vga_dev));
Dave Airlie217f45d2009-03-04 05:57:05 +0000622
623 return sprintf(buf, "%u\n",
624 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
625 IORESOURCE_ROM_SHADOW));
626}
Sachin Kamatbf22c902013-09-28 15:42:00 +0530627static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
Dave Airlie217f45d2009-03-04 05:57:05 +0000628
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400629static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
630 struct bin_attribute *bin_attr, char *buf,
631 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400633 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device,
634 kobj));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 unsigned int size = 64;
636 loff_t init_off = off;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400637 u8 *data = (u8 *) buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
639 /* Several chips lock up trying to read undefined config space */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400640 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 size = dev->cfg_size;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400642 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 size = 128;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
645 if (off > size)
646 return 0;
647 if (off + count > size) {
648 size -= off;
649 count = size;
650 } else {
651 size = count;
652 }
653
Huang Ying3d8387e2012-08-15 09:43:03 +0800654 pci_config_pm_runtime_get(dev);
655
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900656 if ((off & 1) && size) {
657 u8 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700658 pci_user_read_config_byte(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900659 data[off - init_off] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 off++;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900661 size--;
662 }
663
664 if ((off & 3) && size > 2) {
665 u16 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700666 pci_user_read_config_word(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900667 data[off - init_off] = val & 0xff;
668 data[off - init_off + 1] = (val >> 8) & 0xff;
669 off += 2;
670 size -= 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 }
672
673 while (size > 3) {
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900674 u32 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700675 pci_user_read_config_dword(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900676 data[off - init_off] = val & 0xff;
677 data[off - init_off + 1] = (val >> 8) & 0xff;
678 data[off - init_off + 2] = (val >> 16) & 0xff;
679 data[off - init_off + 3] = (val >> 24) & 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 off += 4;
681 size -= 4;
682 }
683
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900684 if (size >= 2) {
685 u16 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700686 pci_user_read_config_word(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900687 data[off - init_off] = val & 0xff;
688 data[off - init_off + 1] = (val >> 8) & 0xff;
689 off += 2;
690 size -= 2;
691 }
692
693 if (size > 0) {
694 u8 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700695 pci_user_read_config_byte(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900696 data[off - init_off] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 off++;
698 --size;
699 }
700
Huang Ying3d8387e2012-08-15 09:43:03 +0800701 pci_config_pm_runtime_put(dev);
702
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 return count;
704}
705
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400706static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
707 struct bin_attribute *bin_attr, char *buf,
708 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400710 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device,
711 kobj));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 unsigned int size = count;
713 loff_t init_off = off;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400714 u8 *data = (u8 *) buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
716 if (off > dev->cfg_size)
717 return 0;
718 if (off + count > dev->cfg_size) {
719 size = dev->cfg_size - off;
720 count = size;
721 }
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700722
Huang Ying3d8387e2012-08-15 09:43:03 +0800723 pci_config_pm_runtime_get(dev);
724
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900725 if ((off & 1) && size) {
Brian Kinge04b0ea2005-09-27 01:21:55 -0700726 pci_user_write_config_byte(dev, off, data[off - init_off]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 off++;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900728 size--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 }
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700730
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900731 if ((off & 3) && size > 2) {
732 u16 val = data[off - init_off];
733 val |= (u16) data[off - init_off + 1] << 8;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400734 pci_user_write_config_word(dev, off, val);
735 off += 2;
736 size -= 2;
737 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
739 while (size > 3) {
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900740 u32 val = data[off - init_off];
741 val |= (u32) data[off - init_off + 1] << 8;
742 val |= (u32) data[off - init_off + 2] << 16;
743 val |= (u32) data[off - init_off + 3] << 24;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700744 pci_user_write_config_dword(dev, off, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 off += 4;
746 size -= 4;
747 }
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700748
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900749 if (size >= 2) {
750 u16 val = data[off - init_off];
751 val |= (u16) data[off - init_off + 1] << 8;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700752 pci_user_write_config_word(dev, off, val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900753 off += 2;
754 size -= 2;
755 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900757 if (size) {
Brian Kinge04b0ea2005-09-27 01:21:55 -0700758 pci_user_write_config_byte(dev, off, data[off - init_off]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 off++;
760 --size;
761 }
762
Huang Ying3d8387e2012-08-15 09:43:03 +0800763 pci_config_pm_runtime_put(dev);
764
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 return count;
766}
767
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400768static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
769 struct bin_attribute *bin_attr, char *buf,
770 loff_t off, size_t count)
Ben Hutchings94e61082008-03-05 16:52:39 +0000771{
772 struct pci_dev *dev =
773 to_pci_dev(container_of(kobj, struct device, kobj));
Ben Hutchings94e61082008-03-05 16:52:39 +0000774
775 if (off > bin_attr->size)
776 count = 0;
777 else if (count > bin_attr->size - off)
778 count = bin_attr->size - off;
Ben Hutchings94e61082008-03-05 16:52:39 +0000779
Stephen Hemminger287d19c2008-12-18 09:17:16 -0800780 return pci_read_vpd(dev, off, count, buf);
781}
Ben Hutchings94e61082008-03-05 16:52:39 +0000782
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400783static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
784 struct bin_attribute *bin_attr, char *buf,
785 loff_t off, size_t count)
Stephen Hemminger287d19c2008-12-18 09:17:16 -0800786{
787 struct pci_dev *dev =
788 to_pci_dev(container_of(kobj, struct device, kobj));
789
790 if (off > bin_attr->size)
791 count = 0;
792 else if (count > bin_attr->size - off)
793 count = bin_attr->size - off;
794
795 return pci_write_vpd(dev, off, count, buf);
Ben Hutchings94e61082008-03-05 16:52:39 +0000796}
797
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798#ifdef HAVE_PCI_LEGACY
799/**
800 * pci_read_legacy_io - read byte(s) from legacy I/O port space
Chris Wright2c3c8be2010-05-12 18:28:57 -0700801 * @filp: open sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 * @kobj: kobject corresponding to file to read from
Randy Dunlapcffb2fa2009-04-10 15:17:50 -0700803 * @bin_attr: struct bin_attribute for this file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 * @buf: buffer to store results
805 * @off: offset into legacy I/O port space
806 * @count: number of bytes to read
807 *
808 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
809 * callback routine (pci_legacy_read).
810 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400811static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
812 struct bin_attribute *bin_attr, char *buf,
813 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400815 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 kobj));
817
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400818 /* Only support 1, 2 or 4 byte accesses */
819 if (count != 1 && count != 2 && count != 4)
820 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400822 return pci_legacy_read(bus, off, (u32 *)buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823}
824
825/**
826 * pci_write_legacy_io - write byte(s) to legacy I/O port space
Chris Wright2c3c8be2010-05-12 18:28:57 -0700827 * @filp: open sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 * @kobj: kobject corresponding to file to read from
Randy Dunlapcffb2fa2009-04-10 15:17:50 -0700829 * @bin_attr: struct bin_attribute for this file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 * @buf: buffer containing value to be written
831 * @off: offset into legacy I/O port space
832 * @count: number of bytes to write
833 *
834 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
835 * callback routine (pci_legacy_write).
836 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400837static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
838 struct bin_attribute *bin_attr, char *buf,
839 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400841 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 kobj));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400844 /* Only support 1, 2 or 4 byte accesses */
845 if (count != 1 && count != 2 && count != 4)
846 return -EINVAL;
847
848 return pci_legacy_write(bus, off, *(u32 *)buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849}
850
851/**
852 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
Chris Wright2c3c8be2010-05-12 18:28:57 -0700853 * @filp: open sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 * @kobj: kobject corresponding to device to be mapped
855 * @attr: struct bin_attribute for this file
856 * @vma: struct vm_area_struct passed to mmap
857 *
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000858 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 * legacy memory space (first meg of bus space) into application virtual
860 * memory space.
861 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400862static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
863 struct bin_attribute *attr,
864 struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400866 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 kobj));
868
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400869 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000870}
871
872/**
873 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
Chris Wright2c3c8be2010-05-12 18:28:57 -0700874 * @filp: open sysfs file
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000875 * @kobj: kobject corresponding to device to be mapped
876 * @attr: struct bin_attribute for this file
877 * @vma: struct vm_area_struct passed to mmap
878 *
879 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
880 * legacy IO space (first meg of bus space) into application virtual
881 * memory space. Returns -ENOSYS if the operation isn't supported
882 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400883static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
884 struct bin_attribute *attr,
885 struct vm_area_struct *vma)
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000886{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400887 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000888 kobj));
889
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400890 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000891}
892
893/**
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300894 * pci_adjust_legacy_attr - adjustment of legacy file attributes
895 * @b: bus to create files under
896 * @mmap_type: I/O port or memory
897 *
898 * Stub implementation. Can be overridden by arch if necessary.
899 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400900void __weak pci_adjust_legacy_attr(struct pci_bus *b,
901 enum pci_mmap_state mmap_type)
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300902{
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300903}
904
905/**
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000906 * pci_create_legacy_files - create legacy I/O port and memory files
907 * @b: bus to create files under
908 *
909 * Some platforms allow access to legacy I/O port and ISA memory space on
910 * a per-bus basis. This routine creates the files and ties them into
911 * their associated read, write and mmap files from pci-sysfs.c
912 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300913 * On error unwind, but don't propagate the error to the caller
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000914 * as it is ok to set up the PCI bus without these files.
915 */
916void pci_create_legacy_files(struct pci_bus *b)
917{
918 int error;
919
920 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
921 GFP_ATOMIC);
922 if (!b->legacy_io)
923 goto kzalloc_err;
924
Stephen Rothwell62e877b82010-03-01 20:38:36 +1100925 sysfs_bin_attr_init(b->legacy_io);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000926 b->legacy_io->attr.name = "legacy_io";
927 b->legacy_io->size = 0xffff;
928 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
929 b->legacy_io->read = pci_read_legacy_io;
930 b->legacy_io->write = pci_write_legacy_io;
931 b->legacy_io->mmap = pci_mmap_legacy_io;
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300932 pci_adjust_legacy_attr(b, pci_mmap_io);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000933 error = device_create_bin_file(&b->dev, b->legacy_io);
934 if (error)
935 goto legacy_io_err;
936
937 /* Allocated above after the legacy_io struct */
938 b->legacy_mem = b->legacy_io + 1;
Mel Gorman6757eca32010-03-10 22:48:34 +0000939 sysfs_bin_attr_init(b->legacy_mem);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000940 b->legacy_mem->attr.name = "legacy_mem";
941 b->legacy_mem->size = 1024*1024;
942 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
943 b->legacy_mem->mmap = pci_mmap_legacy_mem;
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +0300944 pci_adjust_legacy_attr(b, pci_mmap_mem);
Benjamin Herrenschmidtf19aeb12008-10-03 19:49:32 +1000945 error = device_create_bin_file(&b->dev, b->legacy_mem);
946 if (error)
947 goto legacy_mem_err;
948
949 return;
950
951legacy_mem_err:
952 device_remove_bin_file(&b->dev, b->legacy_io);
953legacy_io_err:
954 kfree(b->legacy_io);
955 b->legacy_io = NULL;
956kzalloc_err:
Ryan Desfosses227f0642014-04-18 20:13:50 -0400957 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 +1000958 return;
959}
960
961void pci_remove_legacy_files(struct pci_bus *b)
962{
963 if (b->legacy_io) {
964 device_remove_bin_file(&b->dev, b->legacy_io);
965 device_remove_bin_file(&b->dev, b->legacy_mem);
966 kfree(b->legacy_io); /* both are allocated here */
967 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968}
969#endif /* HAVE_PCI_LEGACY */
970
971#ifdef HAVE_PCI_MMAP
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700972
Martin Wilck3b519e42010-11-10 11:03:21 +0100973int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
974 enum pci_mmap_api mmap_api)
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700975{
Martin Wilck3b519e42010-11-10 11:03:21 +0100976 unsigned long nr, start, size, pci_start;
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700977
Martin Wilck3b519e42010-11-10 11:03:21 +0100978 if (pci_resource_len(pdev, resno) == 0)
979 return 0;
Libin64b00172013-04-15 02:48:54 +0000980 nr = vma_pages(vma);
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700981 start = vma->vm_pgoff;
Ed Swierk88e7df02008-11-03 14:41:16 -0800982 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
Darrick J. Wong8c05cd02010-11-16 09:13:41 -0800983 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
Martin Wilck3b519e42010-11-10 11:03:21 +0100984 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
985 if (start >= pci_start && start < pci_start + size &&
986 start + nr <= pci_start + size)
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700987 return 1;
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700988 return 0;
989}
990
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991/**
992 * pci_mmap_resource - map a PCI resource into user memory space
993 * @kobj: kobject for mapping
994 * @attr: struct bin_attribute for the file being mapped
995 * @vma: struct vm_area_struct passed into the mmap
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700996 * @write_combine: 1 for write_combine mapping
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 *
998 * Use the regular PCI mapping routines to map a PCI resource into userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001000static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1001 struct vm_area_struct *vma, int write_combine)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002{
1003 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1004 struct device, 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
Martin Wilck3b519e42010-11-10 11:03:21 +01001016 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
Ryan Desfosses227f0642014-04-18 20:13:50 -04001017 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 +01001018 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
1019 pci_name(pdev), i,
Randy Dunlape25cd062010-11-13 08:44:33 -08001020 (u64)pci_resource_start(pdev, i),
1021 (u64)pci_resource_len(pdev, i));
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -07001022 return -EINVAL;
Martin Wilck3b519e42010-11-10 11:03:21 +01001023 }
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -07001024
Michael Ellerman2311b1f2005-05-13 17:44:10 +10001025 /* pci_mmap_page_range() expects the same kind of entry as coming
1026 * from /proc/bus/pci/ which is a "user visible" value. If this is
1027 * different from the resource itself, arch will do necessary fixup.
1028 */
1029 pci_resource_to_user(pdev, i, res, &start, &end);
1030 vma->vm_pgoff += start >> PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1032
Arjan van de Vene8de1482008-10-22 19:55:31 -07001033 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
1034 return -EINVAL;
1035
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001036 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1037}
1038
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001039static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1040 struct bin_attribute *attr,
1041 struct vm_area_struct *vma)
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001042{
1043 return pci_mmap_resource(kobj, attr, vma, 0);
1044}
1045
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001046static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1047 struct bin_attribute *attr,
1048 struct vm_area_struct *vma)
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001049{
1050 return pci_mmap_resource(kobj, attr, vma, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051}
1052
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001053static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1054 struct bin_attribute *attr, char *buf,
1055 loff_t off, size_t count, bool write)
Alex Williamson86333282010-07-19 09:45:34 -06001056{
1057 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1058 struct device, kobj));
1059 struct resource *res = attr->private;
1060 unsigned long port = off;
1061 int i;
1062
1063 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1064 if (res == &pdev->resource[i])
1065 break;
1066 if (i >= PCI_ROM_RESOURCE)
1067 return -ENODEV;
1068
1069 port += pci_resource_start(pdev, i);
1070
1071 if (port > pci_resource_end(pdev, i))
1072 return 0;
1073
1074 if (port + count - 1 > pci_resource_end(pdev, i))
1075 return -EINVAL;
1076
1077 switch (count) {
1078 case 1:
1079 if (write)
1080 outb(*(u8 *)buf, port);
1081 else
1082 *(u8 *)buf = inb(port);
1083 return 1;
1084 case 2:
1085 if (write)
1086 outw(*(u16 *)buf, port);
1087 else
1088 *(u16 *)buf = inw(port);
1089 return 2;
1090 case 4:
1091 if (write)
1092 outl(*(u32 *)buf, port);
1093 else
1094 *(u32 *)buf = inl(port);
1095 return 4;
1096 }
1097 return -EINVAL;
1098}
1099
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001100static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1101 struct bin_attribute *attr, char *buf,
1102 loff_t off, size_t count)
Alex Williamson86333282010-07-19 09:45:34 -06001103{
1104 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1105}
1106
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001107static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1108 struct bin_attribute *attr, char *buf,
1109 loff_t off, size_t count)
Alex Williamson86333282010-07-19 09:45:34 -06001110{
1111 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1112}
1113
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114/**
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001115 * pci_remove_resource_files - cleanup resource files
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001116 * @pdev: dev to cleanup
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001117 *
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001118 * If we created resource files for @pdev, remove them from sysfs and
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001119 * free their resources.
1120 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001121static void pci_remove_resource_files(struct pci_dev *pdev)
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001122{
1123 int i;
1124
1125 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1126 struct bin_attribute *res_attr;
1127
1128 res_attr = pdev->res_attr[i];
1129 if (res_attr) {
1130 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1131 kfree(res_attr);
1132 }
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001133
1134 res_attr = pdev->res_attr_wc[i];
1135 if (res_attr) {
1136 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1137 kfree(res_attr);
1138 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001139 }
1140}
1141
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001142static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1143{
1144 /* allocate attribute structure, piggyback attribute name */
1145 int name_len = write_combine ? 13 : 10;
1146 struct bin_attribute *res_attr;
1147 int retval;
1148
1149 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1150 if (res_attr) {
1151 char *res_attr_name = (char *)(res_attr + 1);
1152
Eric W. Biedermana07e4152010-02-11 15:23:05 -08001153 sysfs_bin_attr_init(res_attr);
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001154 if (write_combine) {
1155 pdev->res_attr_wc[num] = res_attr;
1156 sprintf(res_attr_name, "resource%d_wc", num);
1157 res_attr->mmap = pci_mmap_resource_wc;
1158 } else {
1159 pdev->res_attr[num] = res_attr;
1160 sprintf(res_attr_name, "resource%d", num);
1161 res_attr->mmap = pci_mmap_resource_uc;
1162 }
Alex Williamson86333282010-07-19 09:45:34 -06001163 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1164 res_attr->read = pci_read_resource_io;
1165 res_attr->write = pci_write_resource_io;
1166 }
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001167 res_attr->attr.name = res_attr_name;
1168 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1169 res_attr->size = pci_resource_len(pdev, num);
1170 res_attr->private = &pdev->resource[num];
1171 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1172 } else
1173 retval = -ENOMEM;
1174
1175 return retval;
1176}
1177
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001178/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 * pci_create_resource_files - create resource files in sysfs for @dev
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001180 * @pdev: dev in question
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 *
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001182 * Walk the resources in @pdev creating files for each resource available.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 */
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001184static int pci_create_resource_files(struct pci_dev *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185{
1186 int i;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001187 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188
1189 /* Expose the PCI resources from this device as files */
1190 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191
1192 /* skip empty resources */
1193 if (!pci_resource_len(pdev, i))
1194 continue;
1195
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001196 retval = pci_create_attr(pdev, i, 0);
1197 /* for prefetchable resources, create a WC mappable file */
1198 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1199 retval = pci_create_attr(pdev, i, 1);
Dmitry Torokhovd48593b2005-04-29 00:58:46 -05001200
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -07001201 if (retval) {
1202 pci_remove_resource_files(pdev);
1203 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 }
1205 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001206 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207}
1208#else /* !HAVE_PCI_MMAP */
Ivan Kokshaysky10a0ef32009-02-17 13:46:53 +03001209int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1210void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211#endif /* HAVE_PCI_MMAP */
1212
1213/**
1214 * pci_write_rom - used to enable access to the PCI ROM display
Chris Wright2c3c8be2010-05-12 18:28:57 -07001215 * @filp: sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 * @kobj: kernel object handle
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001217 * @bin_attr: struct bin_attribute for this file
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 * @buf: user input
1219 * @off: file offset
1220 * @count: number of byte in input
1221 *
1222 * writing anything except 0 enables it
1223 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001224static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1225 struct bin_attribute *bin_attr, char *buf,
1226 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227{
1228 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1229
1230 if ((off == 0) && (*buf == '0') && (count == 2))
1231 pdev->rom_attr_enabled = 0;
1232 else
1233 pdev->rom_attr_enabled = 1;
1234
1235 return count;
1236}
1237
1238/**
1239 * pci_read_rom - read a PCI ROM
Chris Wright2c3c8be2010-05-12 18:28:57 -07001240 * @filp: sysfs file
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 * @kobj: kernel object handle
Randy Dunlapcffb2fa2009-04-10 15:17:50 -07001242 * @bin_attr: struct bin_attribute for this file
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 * @buf: where to put the data we read from the ROM
1244 * @off: file offset
1245 * @count: number of bytes to read
1246 *
1247 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1248 * device corresponding to @kobj.
1249 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001250static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1251 struct bin_attribute *bin_attr, char *buf,
1252 loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253{
1254 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1255 void __iomem *rom;
1256 size_t size;
1257
1258 if (!pdev->rom_attr_enabled)
1259 return -EINVAL;
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001260
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
Timothy S. Nelson97c44832009-01-30 06:12:47 +11001262 if (!rom || !size)
1263 return -EIO;
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001264
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 if (off >= size)
1266 count = 0;
1267 else {
1268 if (off + count > size)
1269 count = size - off;
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001270
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 memcpy_fromio(buf, rom + off, count);
1272 }
1273 pci_unmap_rom(pdev, rom);
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001274
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 return count;
1276}
1277
1278static struct bin_attribute pci_config_attr = {
1279 .attr = {
1280 .name = "config",
1281 .mode = S_IRUGO | S_IWUSR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282 },
Zhao, Yu557848c2008-10-13 19:18:07 +08001283 .size = PCI_CFG_SPACE_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 .read = pci_read_config,
1285 .write = pci_write_config,
1286};
1287
1288static struct bin_attribute pcie_config_attr = {
1289 .attr = {
1290 .name = "config",
1291 .mode = S_IRUGO | S_IWUSR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 },
Zhao, Yu557848c2008-10-13 19:18:07 +08001293 .size = PCI_CFG_SPACE_EXP_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 .read = pci_read_config,
1295 .write = pci_write_config,
1296};
1297
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001298static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1299 const char *buf, size_t count)
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001300{
1301 struct pci_dev *pdev = to_pci_dev(dev);
1302 unsigned long val;
Jingoo Han9a994e82013-06-01 16:25:25 +09001303 ssize_t result = kstrtoul(buf, 0, &val);
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001304
1305 if (result < 0)
1306 return result;
1307
1308 if (val != 1)
1309 return -EINVAL;
Michal Schmidt447c5dd2010-05-11 11:44:54 +02001310
1311 result = pci_reset_function(pdev);
1312 if (result < 0)
1313 return result;
1314
1315 return count;
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001316}
1317
1318static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1319
Zhao, Yu280c73d2008-10-13 20:01:00 +08001320static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1321{
1322 int retval;
1323 struct bin_attribute *attr;
1324
1325 /* If the device has VPD, try to expose it in sysfs. */
1326 if (dev->vpd) {
1327 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1328 if (!attr)
1329 return -ENOMEM;
1330
Eric W. Biedermana07e4152010-02-11 15:23:05 -08001331 sysfs_bin_attr_init(attr);
Zhao, Yu280c73d2008-10-13 20:01:00 +08001332 attr->size = dev->vpd->len;
1333 attr->attr.name = "vpd";
1334 attr->attr.mode = S_IRUSR | S_IWUSR;
Stephen Hemminger287d19c2008-12-18 09:17:16 -08001335 attr->read = read_vpd_attr;
1336 attr->write = write_vpd_attr;
Zhao, Yu280c73d2008-10-13 20:01:00 +08001337 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1338 if (retval) {
Ben Hutchings0f12a4e2011-01-13 19:47:56 +00001339 kfree(attr);
Zhao, Yu280c73d2008-10-13 20:01:00 +08001340 return retval;
1341 }
1342 dev->vpd->attr = attr;
1343 }
1344
1345 /* Active State Power Management */
1346 pcie_aspm_create_sysfs_dev_files(dev);
1347
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001348 if (!pci_probe_reset_function(dev)) {
1349 retval = device_create_file(&dev->dev, &reset_attr);
1350 if (retval)
1351 goto error;
1352 dev->reset_fn = 1;
1353 }
Zhao, Yu280c73d2008-10-13 20:01:00 +08001354 return 0;
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001355
1356error:
1357 pcie_aspm_remove_sysfs_dev_files(dev);
1358 if (dev->vpd && dev->vpd->attr) {
1359 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1360 kfree(dev->vpd->attr);
1361 }
1362
1363 return retval;
Zhao, Yu280c73d2008-10-13 20:01:00 +08001364}
1365
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001366int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367{
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001368 int retval;
Zhao, Yu280c73d2008-10-13 20:01:00 +08001369 int rom_size = 0;
1370 struct bin_attribute *attr;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001371
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 if (!sysfs_initialized)
1373 return -EACCES;
1374
Zhao, Yu557848c2008-10-13 19:18:07 +08001375 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001376 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 else
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001378 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1379 if (retval)
1380 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001382 retval = pci_create_resource_files(pdev);
1383 if (retval)
Zhao, Yu280c73d2008-10-13 20:01:00 +08001384 goto err_config_file;
1385
1386 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1387 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1388 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1389 rom_size = 0x20000;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390
1391 /* If the device has a ROM, try to expose it in sysfs. */
Zhao, Yu280c73d2008-10-13 20:01:00 +08001392 if (rom_size) {
Ben Hutchings94e61082008-03-05 16:52:39 +00001393 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
Zhao, Yu280c73d2008-10-13 20:01:00 +08001394 if (!attr) {
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001395 retval = -ENOMEM;
Michael Ellerman9890b122007-04-18 13:34:12 +10001396 goto err_resource_files;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 }
Eric W. Biedermana07e4152010-02-11 15:23:05 -08001398 sysfs_bin_attr_init(attr);
Zhao, Yu280c73d2008-10-13 20:01:00 +08001399 attr->size = rom_size;
1400 attr->attr.name = "rom";
Alex Williamsonff295302011-01-05 10:26:41 -07001401 attr->attr.mode = S_IRUSR | S_IWUSR;
Zhao, Yu280c73d2008-10-13 20:01:00 +08001402 attr->read = pci_read_rom;
1403 attr->write = pci_write_rom;
1404 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1405 if (retval) {
1406 kfree(attr);
1407 goto err_resource_files;
1408 }
1409 pdev->rom_attr = attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 }
Zhao, Yu280c73d2008-10-13 20:01:00 +08001411
Zhao, Yu280c73d2008-10-13 20:01:00 +08001412 /* add sysfs entries for various capabilities */
1413 retval = pci_create_capabilities_sysfs(pdev);
1414 if (retval)
Yinghai Lu625e1d52012-11-05 15:20:35 -05001415 goto err_rom_file;
Shaohua Li7d715a62008-02-25 09:46:41 +08001416
Narendra K911e1c92010-07-26 05:56:50 -05001417 pci_create_firmware_label_files(pdev);
1418
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 return 0;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001420
Michael Ellermana2cd52c2007-05-08 12:03:08 +10001421err_rom_file:
Zhao, Yu280c73d2008-10-13 20:01:00 +08001422 if (rom_size) {
Ben Hutchings94e61082008-03-05 16:52:39 +00001423 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
Zhao, Yu280c73d2008-10-13 20:01:00 +08001424 kfree(pdev->rom_attr);
1425 pdev->rom_attr = NULL;
1426 }
Michael Ellerman9890b122007-04-18 13:34:12 +10001427err_resource_files:
1428 pci_remove_resource_files(pdev);
Ben Hutchings94e61082008-03-05 16:52:39 +00001429err_config_file:
Zhao, Yu557848c2008-10-13 19:18:07 +08001430 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001431 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1432 else
1433 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1434err:
1435 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436}
1437
Zhao, Yu280c73d2008-10-13 20:01:00 +08001438static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1439{
1440 if (dev->vpd && dev->vpd->attr) {
1441 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1442 kfree(dev->vpd->attr);
1443 }
1444
1445 pcie_aspm_remove_sysfs_dev_files(dev);
Michael S. Tsirkin711d5772009-07-27 23:37:48 +03001446 if (dev->reset_fn) {
1447 device_remove_file(&dev->dev, &reset_attr);
1448 dev->reset_fn = 0;
1449 }
Zhao, Yu280c73d2008-10-13 20:01:00 +08001450}
1451
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452/**
1453 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1454 * @pdev: device whose entries we should free
1455 *
1456 * Cleanup when @pdev is removed from sysfs.
1457 */
1458void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1459{
Zhao, Yu280c73d2008-10-13 20:01:00 +08001460 int rom_size = 0;
1461
David Millerd67afe52006-11-10 12:27:48 -08001462 if (!sysfs_initialized)
1463 return;
1464
Zhao, Yu280c73d2008-10-13 20:01:00 +08001465 pci_remove_capabilities_sysfs(pdev);
Shaohua Li7d715a62008-02-25 09:46:41 +08001466
Zhao, Yu557848c2008-10-13 19:18:07 +08001467 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1469 else
1470 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1471
1472 pci_remove_resource_files(pdev);
1473
Zhao, Yu280c73d2008-10-13 20:01:00 +08001474 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1475 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1476 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1477 rom_size = 0x20000;
1478
1479 if (rom_size && pdev->rom_attr) {
1480 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1481 kfree(pdev->rom_attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 }
Narendra K911e1c92010-07-26 05:56:50 -05001483
1484 pci_remove_firmware_label_files(pdev);
1485
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486}
1487
1488static int __init pci_sysfs_init(void)
1489{
1490 struct pci_dev *pdev = NULL;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001491 int retval;
1492
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 sysfs_initialized = 1;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001494 for_each_pci_dev(pdev) {
1495 retval = pci_create_sysfs_dev_files(pdev);
Julia Lawall151fc5d2007-11-20 08:41:16 +01001496 if (retval) {
1497 pci_dev_put(pdev);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001498 return retval;
Julia Lawall151fc5d2007-11-20 08:41:16 +01001499 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -07001500 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501
1502 return 0;
1503}
Jesse Barnes40ee9e92007-03-24 11:03:32 -07001504late_initcall(pci_sysfs_init);
Yinghai Lu4e15c462012-11-05 15:20:34 -05001505
1506static struct attribute *pci_dev_dev_attrs[] = {
Yinghai Lu625e1d52012-11-05 15:20:35 -05001507 &vga_attr.attr,
Yinghai Lu4e15c462012-11-05 15:20:34 -05001508 NULL,
1509};
1510
1511static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001512 struct attribute *a, int n)
Yinghai Lu4e15c462012-11-05 15:20:34 -05001513{
Yinghai Lu625e1d52012-11-05 15:20:35 -05001514 struct device *dev = container_of(kobj, struct device, kobj);
1515 struct pci_dev *pdev = to_pci_dev(dev);
1516
1517 if (a == &vga_attr.attr)
1518 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1519 return 0;
1520
Yinghai Lu4e15c462012-11-05 15:20:34 -05001521 return a->mode;
1522}
1523
Jiang Liudfab88b2013-05-31 12:21:31 +08001524static struct attribute *pci_dev_hp_attrs[] = {
1525 &dev_remove_attr.attr,
1526 &dev_rescan_attr.attr,
1527 NULL,
1528};
1529
1530static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001531 struct attribute *a, int n)
Jiang Liudfab88b2013-05-31 12:21:31 +08001532{
1533 struct device *dev = container_of(kobj, struct device, kobj);
1534 struct pci_dev *pdev = to_pci_dev(dev);
1535
1536 if (pdev->is_virtfn)
1537 return 0;
1538
1539 return a->mode;
1540}
1541
1542static struct attribute_group pci_dev_hp_attr_group = {
1543 .attrs = pci_dev_hp_attrs,
1544 .is_visible = pci_dev_hp_attrs_are_visible,
1545};
1546
Donald Dutile17893822012-11-05 15:20:36 -05001547#ifdef CONFIG_PCI_IOV
1548static struct attribute *sriov_dev_attrs[] = {
1549 &sriov_totalvfs_attr.attr,
1550 &sriov_numvfs_attr.attr,
1551 NULL,
1552};
1553
1554static umode_t sriov_attrs_are_visible(struct kobject *kobj,
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001555 struct attribute *a, int n)
Donald Dutile17893822012-11-05 15:20:36 -05001556{
1557 struct device *dev = container_of(kobj, struct device, kobj);
1558
1559 if (!dev_is_pf(dev))
1560 return 0;
1561
1562 return a->mode;
1563}
1564
1565static struct attribute_group sriov_dev_attr_group = {
1566 .attrs = sriov_dev_attrs,
1567 .is_visible = sriov_attrs_are_visible,
1568};
1569#endif /* CONFIG_PCI_IOV */
1570
Yinghai Lu4e15c462012-11-05 15:20:34 -05001571static struct attribute_group pci_dev_attr_group = {
1572 .attrs = pci_dev_dev_attrs,
1573 .is_visible = pci_dev_attrs_are_visible,
1574};
1575
1576static const struct attribute_group *pci_dev_attr_groups[] = {
1577 &pci_dev_attr_group,
Jiang Liudfab88b2013-05-31 12:21:31 +08001578 &pci_dev_hp_attr_group,
Donald Dutile17893822012-11-05 15:20:36 -05001579#ifdef CONFIG_PCI_IOV
1580 &sriov_dev_attr_group,
1581#endif
Yinghai Lu4e15c462012-11-05 15:20:34 -05001582 NULL,
1583};
1584
1585struct device_type pci_dev_type = {
1586 .groups = pci_dev_attr_groups,
1587};