blob: 955ab7990c5bd7045f2bf896e6d4c65989176089 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * File: msi.c
3 * Purpose: PCI Message Signaled Interrupt (MSI)
4 *
5 * Copyright (C) 2003-2004 Intel
6 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
7 */
8
Eric W. Biederman1ce03372006-10-04 02:16:41 -07009#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/mm.h>
11#include <linux/irq.h>
12#include <linux/interrupt.h>
13#include <linux/init.h>
Paul Gortmaker363c75d2011-05-27 09:37:25 -040014#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/ioport.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/pci.h>
17#include <linux/proc_fs.h>
Eric W. Biederman3b7d1922006-10-04 02:16:59 -070018#include <linux/msi.h>
Dan Williams4fdadeb2007-04-26 18:21:38 -070019#include <linux/smp.h>
Hidetoshi Seto500559a2009-08-10 10:14:15 +090020#include <linux/errno.h>
21#include <linux/io.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24#include "pci.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Linus Torvalds1da177e2005-04-16 15:20:36 -070026static int pci_msi_enable = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
Bjorn Helgaas527eee22013-04-17 17:44:48 -060028#define msix_table_size(flags) ((flags & PCI_MSIX_FLAGS_QSIZE) + 1)
29
30
Adrian Bunk6a9e7f22007-12-11 23:19:41 +010031/* Arch hooks */
32
Thomas Petazzoni4287d822013-08-09 22:27:06 +020033int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
34{
Thierry Reding0cbdcfc2013-08-09 22:27:08 +020035 struct msi_chip *chip = dev->bus->msi;
36 int err;
37
38 if (!chip || !chip->setup_irq)
39 return -EINVAL;
40
41 err = chip->setup_irq(chip, dev, desc);
42 if (err < 0)
43 return err;
44
45 irq_set_chip_data(desc->irq, chip);
46
47 return 0;
Thomas Petazzoni4287d822013-08-09 22:27:06 +020048}
49
50void __weak arch_teardown_msi_irq(unsigned int irq)
51{
Thierry Reding0cbdcfc2013-08-09 22:27:08 +020052 struct msi_chip *chip = irq_get_chip_data(irq);
53
54 if (!chip || !chip->teardown_irq)
55 return;
56
57 chip->teardown_irq(chip, irq);
Thomas Petazzoni4287d822013-08-09 22:27:06 +020058}
59
60int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type)
Adrian Bunk6a9e7f22007-12-11 23:19:41 +010061{
Thierry Reding0cbdcfc2013-08-09 22:27:08 +020062 struct msi_chip *chip = dev->bus->msi;
63
64 if (!chip || !chip->check_device)
65 return 0;
66
67 return chip->check_device(chip, dev, nvec, type);
Adrian Bunk6a9e7f22007-12-11 23:19:41 +010068}
69
Thomas Petazzoni4287d822013-08-09 22:27:06 +020070int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
Adrian Bunk6a9e7f22007-12-11 23:19:41 +010071{
72 struct msi_desc *entry;
73 int ret;
74
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -040075 /*
76 * If an architecture wants to support multiple MSI, it needs to
77 * override arch_setup_msi_irqs()
78 */
79 if (type == PCI_CAP_ID_MSI && nvec > 1)
80 return 1;
81
Adrian Bunk6a9e7f22007-12-11 23:19:41 +010082 list_for_each_entry(entry, &dev->msi_list, list) {
83 ret = arch_setup_msi_irq(dev, entry);
Michael Ellermanb5fbf532009-02-11 22:27:02 +110084 if (ret < 0)
Adrian Bunk6a9e7f22007-12-11 23:19:41 +010085 return ret;
Michael Ellermanb5fbf532009-02-11 22:27:02 +110086 if (ret > 0)
87 return -ENOSPC;
Adrian Bunk6a9e7f22007-12-11 23:19:41 +010088 }
89
90 return 0;
91}
92
Thomas Petazzoni4287d822013-08-09 22:27:06 +020093/*
94 * We have a default implementation available as a separate non-weak
95 * function, as it is used by the Xen x86 PCI code
96 */
Thomas Gleixner1525bf02010-10-06 16:05:35 -040097void default_teardown_msi_irqs(struct pci_dev *dev)
Adrian Bunk6a9e7f22007-12-11 23:19:41 +010098{
99 struct msi_desc *entry;
100
101 list_for_each_entry(entry, &dev->msi_list, list) {
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400102 int i, nvec;
103 if (entry->irq == 0)
104 continue;
Alexander Gordeev65f6ae62013-05-13 11:05:48 +0200105 if (entry->nvec_used)
106 nvec = entry->nvec_used;
107 else
108 nvec = 1 << entry->msi_attrib.multiple;
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400109 for (i = 0; i < nvec; i++)
110 arch_teardown_msi_irq(entry->irq + i);
Adrian Bunk6a9e7f22007-12-11 23:19:41 +0100111 }
112}
113
Thomas Petazzoni4287d822013-08-09 22:27:06 +0200114void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
115{
116 return default_teardown_msi_irqs(dev);
117}
Konrad Rzeszutek Wilk76ccc292011-12-16 17:38:18 -0500118
DuanZhenzhongac8344c2013-12-04 13:09:16 +0800119static void default_restore_msi_irq(struct pci_dev *dev, int irq)
Konrad Rzeszutek Wilk76ccc292011-12-16 17:38:18 -0500120{
121 struct msi_desc *entry;
122
123 entry = NULL;
124 if (dev->msix_enabled) {
125 list_for_each_entry(entry, &dev->msi_list, list) {
126 if (irq == entry->irq)
127 break;
128 }
129 } else if (dev->msi_enabled) {
130 entry = irq_get_msi_desc(irq);
131 }
132
133 if (entry)
134 write_msi_msg(irq, &entry->msg);
135}
Thomas Petazzoni4287d822013-08-09 22:27:06 +0200136
DuanZhenzhongac8344c2013-12-04 13:09:16 +0800137void __weak arch_restore_msi_irqs(struct pci_dev *dev)
Thomas Petazzoni4287d822013-08-09 22:27:06 +0200138{
DuanZhenzhongac8344c2013-12-04 13:09:16 +0800139 return default_restore_msi_irqs(dev);
Thomas Petazzoni4287d822013-08-09 22:27:06 +0200140}
Konrad Rzeszutek Wilk76ccc292011-12-16 17:38:18 -0500141
Gavin Shane375b562013-04-04 16:54:30 +0000142static void msi_set_enable(struct pci_dev *dev, int enable)
Eric W. Biedermanb1cbf4e2007-03-05 00:30:10 -0800143{
Eric W. Biedermanb1cbf4e2007-03-05 00:30:10 -0800144 u16 control;
145
Gavin Shane375b562013-04-04 16:54:30 +0000146 pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
Matthew Wilcox110828c2009-06-16 06:31:45 -0600147 control &= ~PCI_MSI_FLAGS_ENABLE;
148 if (enable)
149 control |= PCI_MSI_FLAGS_ENABLE;
Gavin Shane375b562013-04-04 16:54:30 +0000150 pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
Hidetoshi Seto5ca5c022008-05-19 13:48:17 +0900151}
152
Eric W. Biedermanb1cbf4e2007-03-05 00:30:10 -0800153static void msix_set_enable(struct pci_dev *dev, int enable)
154{
Eric W. Biedermanb1cbf4e2007-03-05 00:30:10 -0800155 u16 control;
156
Gavin Shane375b562013-04-04 16:54:30 +0000157 pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
158 control &= ~PCI_MSIX_FLAGS_ENABLE;
159 if (enable)
160 control |= PCI_MSIX_FLAGS_ENABLE;
161 pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, control);
Eric W. Biedermanb1cbf4e2007-03-05 00:30:10 -0800162}
163
Matthew Wilcoxbffac3c2009-01-21 19:19:19 -0500164static inline __attribute_const__ u32 msi_mask(unsigned x)
165{
Matthew Wilcox0b49ec32009-02-08 20:27:47 -0700166 /* Don't shift by >= width of type */
167 if (x >= 5)
168 return 0xffffffff;
169 return (1 << (1 << x)) - 1;
Matthew Wilcoxbffac3c2009-01-21 19:19:19 -0500170}
171
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400172static inline __attribute_const__ u32 msi_capable_mask(u16 control)
Mitch Williams988cbb12007-03-30 11:54:08 -0700173{
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400174 return msi_mask((control >> 1) & 7);
175}
Mitch Williams988cbb12007-03-30 11:54:08 -0700176
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400177static inline __attribute_const__ u32 msi_enabled_mask(u16 control)
178{
179 return msi_mask((control >> 4) & 7);
Mitch Williams988cbb12007-03-30 11:54:08 -0700180}
181
Matthew Wilcoxce6fce42008-07-25 15:42:58 -0600182/*
183 * PCI 2.3 does not specify mask bits for each MSI interrupt. Attempting to
184 * mask all MSI interrupts by clearing the MSI enable bit does not work
185 * reliably as devices without an INTx disable bit will then generate a
186 * level IRQ which will never be cleared.
Matthew Wilcoxce6fce42008-07-25 15:42:58 -0600187 */
Konrad Rzeszutek Wilk0e4ccb12013-11-06 16:16:56 -0500188u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189{
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400190 u32 mask_bits = desc->masked;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400192 if (!desc->msi_attrib.maskbit)
Hidetoshi Seto12abb8b2009-06-24 12:08:09 +0900193 return 0;
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400194
195 mask_bits &= ~mask;
196 mask_bits |= flag;
197 pci_write_config_dword(desc->dev, desc->mask_pos, mask_bits);
Hidetoshi Seto12abb8b2009-06-24 12:08:09 +0900198
199 return mask_bits;
200}
201
Konrad Rzeszutek Wilk0e4ccb12013-11-06 16:16:56 -0500202__weak u32 arch_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
203{
204 return default_msi_mask_irq(desc, mask, flag);
205}
206
Hidetoshi Seto12abb8b2009-06-24 12:08:09 +0900207static void msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
208{
Konrad Rzeszutek Wilk0e4ccb12013-11-06 16:16:56 -0500209 desc->masked = arch_msi_mask_irq(desc, mask, flag);
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400210}
211
212/*
213 * This internal function does not flush PCI writes to the device.
214 * All users must ensure that they read from the device before either
215 * assuming that the device state is up to date, or returning out of this
216 * file. This saves a few milliseconds when initialising devices with lots
217 * of MSI-X interrupts.
218 */
Konrad Rzeszutek Wilk0e4ccb12013-11-06 16:16:56 -0500219u32 default_msix_mask_irq(struct msi_desc *desc, u32 flag)
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400220{
221 u32 mask_bits = desc->masked;
222 unsigned offset = desc->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
Hidetoshi Seto2c21fd42009-06-23 17:40:04 +0900223 PCI_MSIX_ENTRY_VECTOR_CTRL;
Sheng Yang8d805282010-11-11 15:46:55 +0800224 mask_bits &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
225 if (flag)
226 mask_bits |= PCI_MSIX_ENTRY_CTRL_MASKBIT;
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400227 writel(mask_bits, desc->mask_base + offset);
Hidetoshi Seto12abb8b2009-06-24 12:08:09 +0900228
229 return mask_bits;
230}
231
Konrad Rzeszutek Wilk0e4ccb12013-11-06 16:16:56 -0500232__weak u32 arch_msix_mask_irq(struct msi_desc *desc, u32 flag)
233{
234 return default_msix_mask_irq(desc, flag);
235}
236
Hidetoshi Seto12abb8b2009-06-24 12:08:09 +0900237static void msix_mask_irq(struct msi_desc *desc, u32 flag)
238{
Konrad Rzeszutek Wilk0e4ccb12013-11-06 16:16:56 -0500239 desc->masked = arch_msix_mask_irq(desc, flag);
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400240}
241
Thomas Gleixner1c9db522010-09-28 16:46:51 +0200242static void msi_set_mask_bit(struct irq_data *data, u32 flag)
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400243{
Thomas Gleixner1c9db522010-09-28 16:46:51 +0200244 struct msi_desc *desc = irq_data_get_msi(data);
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400245
246 if (desc->msi_attrib.is_msix) {
247 msix_mask_irq(desc, flag);
248 readl(desc->mask_base); /* Flush write to device */
Matthew Wilcox24d27552009-03-17 08:54:06 -0400249 } else {
Thomas Gleixner1c9db522010-09-28 16:46:51 +0200250 unsigned offset = data->irq - desc->dev->irq;
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400251 msi_mask_irq(desc, 1 << offset, flag << offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 }
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400253}
254
Thomas Gleixner1c9db522010-09-28 16:46:51 +0200255void mask_msi_irq(struct irq_data *data)
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400256{
Thomas Gleixner1c9db522010-09-28 16:46:51 +0200257 msi_set_mask_bit(data, 1);
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400258}
259
Thomas Gleixner1c9db522010-09-28 16:46:51 +0200260void unmask_msi_irq(struct irq_data *data)
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400261{
Thomas Gleixner1c9db522010-09-28 16:46:51 +0200262 msi_set_mask_bit(data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263}
264
DuanZhenzhongac8344c2013-12-04 13:09:16 +0800265void default_restore_msi_irqs(struct pci_dev *dev)
266{
267 struct msi_desc *entry;
268
269 list_for_each_entry(entry, &dev->msi_list, list) {
270 default_restore_msi_irq(dev, entry->irq);
271 }
272}
273
Thomas Gleixner39431ac2010-09-28 19:09:51 +0200274void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
Eric W. Biederman0366f8f2006-10-04 02:16:33 -0700275{
Ben Hutchings30da5522010-07-23 14:56:28 +0100276 BUG_ON(entry->dev->current_state != PCI_D0);
Eric W. Biederman0366f8f2006-10-04 02:16:33 -0700277
Ben Hutchings30da5522010-07-23 14:56:28 +0100278 if (entry->msi_attrib.is_msix) {
279 void __iomem *base = entry->mask_base +
280 entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
281
282 msg->address_lo = readl(base + PCI_MSIX_ENTRY_LOWER_ADDR);
283 msg->address_hi = readl(base + PCI_MSIX_ENTRY_UPPER_ADDR);
284 msg->data = readl(base + PCI_MSIX_ENTRY_DATA);
285 } else {
286 struct pci_dev *dev = entry->dev;
Bjorn Helgaasf5322162013-04-17 17:34:36 -0600287 int pos = dev->msi_cap;
Ben Hutchings30da5522010-07-23 14:56:28 +0100288 u16 data;
289
Bjorn Helgaas9925ad02013-04-17 17:39:57 -0600290 pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
291 &msg->address_lo);
Ben Hutchings30da5522010-07-23 14:56:28 +0100292 if (entry->msi_attrib.is_64) {
Bjorn Helgaas9925ad02013-04-17 17:39:57 -0600293 pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
294 &msg->address_hi);
Bjorn Helgaas2f221342013-04-17 17:41:13 -0600295 pci_read_config_word(dev, pos + PCI_MSI_DATA_64, &data);
Ben Hutchings30da5522010-07-23 14:56:28 +0100296 } else {
297 msg->address_hi = 0;
Bjorn Helgaas2f221342013-04-17 17:41:13 -0600298 pci_read_config_word(dev, pos + PCI_MSI_DATA_32, &data);
Ben Hutchings30da5522010-07-23 14:56:28 +0100299 }
300 msg->data = data;
301 }
Eric W. Biederman0366f8f2006-10-04 02:16:33 -0700302}
303
Yinghai Lu3145e942008-12-05 18:58:34 -0800304void read_msi_msg(unsigned int irq, struct msi_msg *msg)
Eric W. Biederman0366f8f2006-10-04 02:16:33 -0700305{
Thomas Gleixnerdced35a2011-03-28 17:49:12 +0200306 struct msi_desc *entry = irq_get_msi_desc(irq);
Yinghai Lu3145e942008-12-05 18:58:34 -0800307
Thomas Gleixner39431ac2010-09-28 19:09:51 +0200308 __read_msi_msg(entry, msg);
Yinghai Lu3145e942008-12-05 18:58:34 -0800309}
310
Thomas Gleixner39431ac2010-09-28 19:09:51 +0200311void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
Ben Hutchings30da5522010-07-23 14:56:28 +0100312{
Ben Hutchings30da5522010-07-23 14:56:28 +0100313 /* Assert that the cache is valid, assuming that
314 * valid messages are not all-zeroes. */
315 BUG_ON(!(entry->msg.address_hi | entry->msg.address_lo |
316 entry->msg.data));
317
318 *msg = entry->msg;
319}
320
321void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
322{
Thomas Gleixnerdced35a2011-03-28 17:49:12 +0200323 struct msi_desc *entry = irq_get_msi_desc(irq);
Ben Hutchings30da5522010-07-23 14:56:28 +0100324
Thomas Gleixner39431ac2010-09-28 19:09:51 +0200325 __get_cached_msi_msg(entry, msg);
Ben Hutchings30da5522010-07-23 14:56:28 +0100326}
327
Thomas Gleixner39431ac2010-09-28 19:09:51 +0200328void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
Yinghai Lu3145e942008-12-05 18:58:34 -0800329{
Ben Hutchingsfcd097f2010-06-17 20:16:36 +0100330 if (entry->dev->current_state != PCI_D0) {
331 /* Don't touch the hardware now */
332 } else if (entry->msi_attrib.is_msix) {
Matthew Wilcox24d27552009-03-17 08:54:06 -0400333 void __iomem *base;
334 base = entry->mask_base +
335 entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
336
Hidetoshi Seto2c21fd42009-06-23 17:40:04 +0900337 writel(msg->address_lo, base + PCI_MSIX_ENTRY_LOWER_ADDR);
338 writel(msg->address_hi, base + PCI_MSIX_ENTRY_UPPER_ADDR);
339 writel(msg->data, base + PCI_MSIX_ENTRY_DATA);
Matthew Wilcox24d27552009-03-17 08:54:06 -0400340 } else {
Eric W. Biederman0366f8f2006-10-04 02:16:33 -0700341 struct pci_dev *dev = entry->dev;
Bjorn Helgaasf5322162013-04-17 17:34:36 -0600342 int pos = dev->msi_cap;
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400343 u16 msgctl;
344
Bjorn Helgaasf84ecd22013-04-17 17:38:32 -0600345 pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl);
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400346 msgctl &= ~PCI_MSI_FLAGS_QSIZE;
347 msgctl |= entry->msi_attrib.multiple << 4;
Bjorn Helgaasf84ecd22013-04-17 17:38:32 -0600348 pci_write_config_word(dev, pos + PCI_MSI_FLAGS, msgctl);
Eric W. Biederman0366f8f2006-10-04 02:16:33 -0700349
Bjorn Helgaas9925ad02013-04-17 17:39:57 -0600350 pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
351 msg->address_lo);
Eric W. Biederman0366f8f2006-10-04 02:16:33 -0700352 if (entry->msi_attrib.is_64) {
Bjorn Helgaas9925ad02013-04-17 17:39:57 -0600353 pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
354 msg->address_hi);
Bjorn Helgaas2f221342013-04-17 17:41:13 -0600355 pci_write_config_word(dev, pos + PCI_MSI_DATA_64,
356 msg->data);
Eric W. Biederman0366f8f2006-10-04 02:16:33 -0700357 } else {
Bjorn Helgaas2f221342013-04-17 17:41:13 -0600358 pci_write_config_word(dev, pos + PCI_MSI_DATA_32,
359 msg->data);
Eric W. Biederman0366f8f2006-10-04 02:16:33 -0700360 }
Eric W. Biederman0366f8f2006-10-04 02:16:33 -0700361 }
Eric W. Biederman392ee1e2007-03-08 13:04:57 -0700362 entry->msg = *msg;
Eric W. Biederman0366f8f2006-10-04 02:16:33 -0700363}
364
Yinghai Lu3145e942008-12-05 18:58:34 -0800365void write_msi_msg(unsigned int irq, struct msi_msg *msg)
366{
Thomas Gleixnerdced35a2011-03-28 17:49:12 +0200367 struct msi_desc *entry = irq_get_msi_desc(irq);
Yinghai Lu3145e942008-12-05 18:58:34 -0800368
Thomas Gleixner39431ac2010-09-28 19:09:51 +0200369 __write_msi_msg(entry, msg);
Yinghai Lu3145e942008-12-05 18:58:34 -0800370}
371
Hidetoshi Setof56e4482009-08-06 11:32:51 +0900372static void free_msi_irqs(struct pci_dev *dev)
373{
374 struct msi_desc *entry, *tmp;
Greg Kroah-Hartman1c51b502013-12-19 12:30:17 -0800375 struct attribute **msi_attrs;
376 struct device_attribute *dev_attr;
377 int count = 0;
Hidetoshi Setof56e4482009-08-06 11:32:51 +0900378
379 list_for_each_entry(entry, &dev->msi_list, list) {
380 int i, nvec;
381 if (!entry->irq)
382 continue;
Alexander Gordeev65f6ae62013-05-13 11:05:48 +0200383 if (entry->nvec_used)
384 nvec = entry->nvec_used;
385 else
386 nvec = 1 << entry->msi_attrib.multiple;
Hidetoshi Setof56e4482009-08-06 11:32:51 +0900387 for (i = 0; i < nvec; i++)
388 BUG_ON(irq_has_action(entry->irq + i));
389 }
390
391 arch_teardown_msi_irqs(dev);
392
393 list_for_each_entry_safe(entry, tmp, &dev->msi_list, list) {
394 if (entry->msi_attrib.is_msix) {
395 if (list_is_last(&entry->list, &dev->msi_list))
396 iounmap(entry->mask_base);
397 }
Neil Horman424eb392012-01-03 10:29:54 -0500398
399 /*
400 * Its possible that we get into this path
401 * When populate_msi_sysfs fails, which means the entries
402 * were not registered with sysfs. In that case don't
403 * unregister them.
404 */
405 if (entry->kobj.parent) {
406 kobject_del(&entry->kobj);
407 kobject_put(&entry->kobj);
408 }
409
Hidetoshi Setof56e4482009-08-06 11:32:51 +0900410 list_del(&entry->list);
411 kfree(entry);
412 }
Greg Kroah-Hartman1c51b502013-12-19 12:30:17 -0800413
414 if (dev->msi_irq_groups) {
415 sysfs_remove_groups(&dev->dev.kobj, dev->msi_irq_groups);
416 msi_attrs = dev->msi_irq_groups[0]->attrs;
417 list_for_each_entry(entry, &dev->msi_list, list) {
418 dev_attr = container_of(msi_attrs[count],
419 struct device_attribute, attr);
420 kfree(dev_attr->attr.name);
421 kfree(dev_attr);
422 ++count;
423 }
424 kfree(msi_attrs);
425 kfree(dev->msi_irq_groups[0]);
426 kfree(dev->msi_irq_groups);
427 dev->msi_irq_groups = NULL;
428 }
Hidetoshi Setof56e4482009-08-06 11:32:51 +0900429}
Satoru Takeuchic54c1872007-01-18 13:50:05 +0900430
Matthew Wilcox379f5322009-03-17 08:54:07 -0400431static struct msi_desc *alloc_msi_entry(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432{
Matthew Wilcox379f5322009-03-17 08:54:07 -0400433 struct msi_desc *desc = kzalloc(sizeof(*desc), GFP_KERNEL);
434 if (!desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 return NULL;
436
Matthew Wilcox379f5322009-03-17 08:54:07 -0400437 INIT_LIST_HEAD(&desc->list);
438 desc->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
Matthew Wilcox379f5322009-03-17 08:54:07 -0400440 return desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441}
442
David Millerba698ad2007-10-25 01:16:30 -0700443static void pci_intx_for_msi(struct pci_dev *dev, int enable)
444{
445 if (!(dev->dev_flags & PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG))
446 pci_intx(dev, enable);
447}
448
Michael Ellerman8fed4b62007-01-25 19:34:08 +1100449static void __pci_restore_msi_state(struct pci_dev *dev)
Shaohua Li41017f02006-02-08 17:11:38 +0800450{
Shaohua Li41017f02006-02-08 17:11:38 +0800451 u16 control;
Eric W. Biederman392ee1e2007-03-08 13:04:57 -0700452 struct msi_desc *entry;
Shaohua Li41017f02006-02-08 17:11:38 +0800453
Eric W. Biedermanb1cbf4e2007-03-05 00:30:10 -0800454 if (!dev->msi_enabled)
455 return;
456
Thomas Gleixnerdced35a2011-03-28 17:49:12 +0200457 entry = irq_get_msi_desc(dev->irq);
Shaohua Li41017f02006-02-08 17:11:38 +0800458
David Millerba698ad2007-10-25 01:16:30 -0700459 pci_intx_for_msi(dev, 0);
Gavin Shane375b562013-04-04 16:54:30 +0000460 msi_set_enable(dev, 0);
DuanZhenzhongac8344c2013-12-04 13:09:16 +0800461 arch_restore_msi_irqs(dev);
Eric W. Biederman392ee1e2007-03-08 13:04:57 -0700462
Bjorn Helgaasf5322162013-04-17 17:34:36 -0600463 pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400464 msi_mask_irq(entry, msi_capable_mask(control), entry->masked);
Jesse Barnesabad2ec2008-08-07 08:52:37 -0700465 control &= ~PCI_MSI_FLAGS_QSIZE;
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400466 control |= (entry->msi_attrib.multiple << 4) | PCI_MSI_FLAGS_ENABLE;
Bjorn Helgaasf5322162013-04-17 17:34:36 -0600467 pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
Michael Ellerman8fed4b62007-01-25 19:34:08 +1100468}
469
470static void __pci_restore_msix_state(struct pci_dev *dev)
Shaohua Li41017f02006-02-08 17:11:38 +0800471{
Shaohua Li41017f02006-02-08 17:11:38 +0800472 struct msi_desc *entry;
Eric W. Biederman392ee1e2007-03-08 13:04:57 -0700473 u16 control;
Shaohua Li41017f02006-02-08 17:11:38 +0800474
Eric W. Biedermanded86d82007-01-28 12:42:52 -0700475 if (!dev->msix_enabled)
476 return;
Matthew Wilcoxf5982822009-06-18 19:15:59 -0700477 BUG_ON(list_empty(&dev->msi_list));
Hidetoshi Seto9cc8d542009-08-06 11:32:04 +0900478 entry = list_first_entry(&dev->msi_list, struct msi_desc, list);
Bjorn Helgaasf5322162013-04-17 17:34:36 -0600479 pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
Eric W. Biedermanded86d82007-01-28 12:42:52 -0700480
Shaohua Li41017f02006-02-08 17:11:38 +0800481 /* route the table */
David Millerba698ad2007-10-25 01:16:30 -0700482 pci_intx_for_msi(dev, 0);
Matthew Wilcoxf5982822009-06-18 19:15:59 -0700483 control |= PCI_MSIX_FLAGS_ENABLE | PCI_MSIX_FLAGS_MASKALL;
Bjorn Helgaasf5322162013-04-17 17:34:36 -0600484 pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, control);
Shaohua Li41017f02006-02-08 17:11:38 +0800485
DuanZhenzhongac8344c2013-12-04 13:09:16 +0800486 arch_restore_msi_irqs(dev);
Michael Ellerman4aa9bc92007-04-05 17:19:10 +1000487 list_for_each_entry(entry, &dev->msi_list, list) {
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400488 msix_mask_irq(entry, entry->masked);
Shaohua Li41017f02006-02-08 17:11:38 +0800489 }
Shaohua Li41017f02006-02-08 17:11:38 +0800490
Eric W. Biederman392ee1e2007-03-08 13:04:57 -0700491 control &= ~PCI_MSIX_FLAGS_MASKALL;
Bjorn Helgaasf5322162013-04-17 17:34:36 -0600492 pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, control);
Shaohua Li41017f02006-02-08 17:11:38 +0800493}
Michael Ellerman8fed4b62007-01-25 19:34:08 +1100494
495void pci_restore_msi_state(struct pci_dev *dev)
496{
497 __pci_restore_msi_state(dev);
498 __pci_restore_msix_state(dev);
499}
Linas Vepstas94688cf2007-11-07 15:43:59 -0600500EXPORT_SYMBOL_GPL(pci_restore_msi_state);
Shaohua Li41017f02006-02-08 17:11:38 +0800501
Greg Kroah-Hartman1c51b502013-12-19 12:30:17 -0800502static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr,
Neil Hormanda8d1c82011-10-06 14:08:18 -0400503 char *buf)
504{
Greg Kroah-Hartman1c51b502013-12-19 12:30:17 -0800505 struct pci_dev *pdev = to_pci_dev(dev);
506 struct msi_desc *entry;
507 unsigned long irq;
508 int retval;
509
510 retval = kstrtoul(attr->attr.name, 10, &irq);
511 if (retval)
512 return retval;
513
514 list_for_each_entry(entry, &pdev->msi_list, list) {
515 if (entry->irq == irq) {
516 return sprintf(buf, "%s\n",
517 entry->msi_attrib.is_msix ? "msix" : "msi");
518 }
519 }
520 return -ENODEV;
Neil Hormanda8d1c82011-10-06 14:08:18 -0400521}
522
Neil Hormanda8d1c82011-10-06 14:08:18 -0400523static int populate_msi_sysfs(struct pci_dev *pdev)
524{
Greg Kroah-Hartman1c51b502013-12-19 12:30:17 -0800525 struct attribute **msi_attrs;
526 struct attribute *msi_attr;
527 struct device_attribute *msi_dev_attr;
528 struct attribute_group *msi_irq_group;
529 const struct attribute_group **msi_irq_groups;
Neil Hormanda8d1c82011-10-06 14:08:18 -0400530 struct msi_desc *entry;
Greg Kroah-Hartman1c51b502013-12-19 12:30:17 -0800531 int ret = -ENOMEM;
532 int num_msi = 0;
Neil Hormanda8d1c82011-10-06 14:08:18 -0400533 int count = 0;
534
Greg Kroah-Hartman1c51b502013-12-19 12:30:17 -0800535 /* Determine how many msi entries we have */
Neil Hormanda8d1c82011-10-06 14:08:18 -0400536 list_for_each_entry(entry, &pdev->msi_list, list) {
Greg Kroah-Hartman1c51b502013-12-19 12:30:17 -0800537 ++num_msi;
Neil Hormanda8d1c82011-10-06 14:08:18 -0400538 }
Greg Kroah-Hartman1c51b502013-12-19 12:30:17 -0800539 if (!num_msi)
540 return 0;
541
542 /* Dynamically create the MSI attributes for the PCI device */
543 msi_attrs = kzalloc(sizeof(void *) * (num_msi + 1), GFP_KERNEL);
544 if (!msi_attrs)
545 return -ENOMEM;
546 list_for_each_entry(entry, &pdev->msi_list, list) {
547 char *name = kmalloc(20, GFP_KERNEL);
Greg Kroah-Hartman86bb4f62014-02-13 10:47:20 -0700548 if (!name)
Greg Kroah-Hartman1c51b502013-12-19 12:30:17 -0800549 goto error_attrs;
Greg Kroah-Hartman86bb4f62014-02-13 10:47:20 -0700550
551 msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL);
552 if (!msi_dev_attr) {
553 kfree(name);
554 goto error_attrs;
555 }
556
Greg Kroah-Hartman1c51b502013-12-19 12:30:17 -0800557 sprintf(name, "%d", entry->irq);
558 sysfs_attr_init(&msi_dev_attr->attr);
559 msi_dev_attr->attr.name = name;
560 msi_dev_attr->attr.mode = S_IRUGO;
561 msi_dev_attr->show = msi_mode_show;
562 msi_attrs[count] = &msi_dev_attr->attr;
563 ++count;
564 }
565
566 msi_irq_group = kzalloc(sizeof(*msi_irq_group), GFP_KERNEL);
567 if (!msi_irq_group)
568 goto error_attrs;
569 msi_irq_group->name = "msi_irqs";
570 msi_irq_group->attrs = msi_attrs;
571
572 msi_irq_groups = kzalloc(sizeof(void *) * 2, GFP_KERNEL);
573 if (!msi_irq_groups)
574 goto error_irq_group;
575 msi_irq_groups[0] = msi_irq_group;
576
577 ret = sysfs_create_groups(&pdev->dev.kobj, msi_irq_groups);
578 if (ret)
579 goto error_irq_groups;
580 pdev->msi_irq_groups = msi_irq_groups;
Neil Hormanda8d1c82011-10-06 14:08:18 -0400581
582 return 0;
583
Greg Kroah-Hartman1c51b502013-12-19 12:30:17 -0800584error_irq_groups:
585 kfree(msi_irq_groups);
586error_irq_group:
587 kfree(msi_irq_group);
588error_attrs:
589 count = 0;
590 msi_attr = msi_attrs[count];
591 while (msi_attr) {
592 msi_dev_attr = container_of(msi_attr, struct device_attribute, attr);
593 kfree(msi_attr->name);
594 kfree(msi_dev_attr);
595 ++count;
596 msi_attr = msi_attrs[count];
Neil Hormanda8d1c82011-10-06 14:08:18 -0400597 }
Greg Kroah-Hartman29237752014-02-13 10:47:35 -0700598 kfree(msi_attrs);
Neil Hormanda8d1c82011-10-06 14:08:18 -0400599 return ret;
600}
601
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602/**
603 * msi_capability_init - configure device's MSI capability structure
604 * @dev: pointer to the pci_dev data structure of MSI device function
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400605 * @nvec: number of interrupts to allocate
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 *
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400607 * Setup the MSI capability structure of the device with the requested
608 * number of interrupts. A return value of zero indicates the successful
609 * setup of an entry with the new MSI irq. A negative return value indicates
610 * an error, and a positive return value indicates the number of interrupts
611 * which could have been allocated.
612 */
613static int msi_capability_init(struct pci_dev *dev, int nvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614{
615 struct msi_desc *entry;
Gavin Shanf4651362013-04-04 16:54:32 +0000616 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 u16 control;
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400618 unsigned mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Gavin Shane375b562013-04-04 16:54:30 +0000620 msi_set_enable(dev, 0); /* Disable MSI during set up */
Matthew Wilcox110828c2009-06-16 06:31:45 -0600621
Bjorn Helgaasf84ecd22013-04-17 17:38:32 -0600622 pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 /* MSI Entry Initialization */
Matthew Wilcox379f5322009-03-17 08:54:07 -0400624 entry = alloc_msi_entry(dev);
Eric W. Biedermanf7feaca2007-01-28 12:56:37 -0700625 if (!entry)
626 return -ENOMEM;
Eric W. Biederman1ce03372006-10-04 02:16:41 -0700627
Hidetoshi Seto500559a2009-08-10 10:14:15 +0900628 entry->msi_attrib.is_msix = 0;
Bjorn Helgaas4987ce82013-04-17 17:42:30 -0600629 entry->msi_attrib.is_64 = !!(control & PCI_MSI_FLAGS_64BIT);
Hidetoshi Seto500559a2009-08-10 10:14:15 +0900630 entry->msi_attrib.entry_nr = 0;
Bjorn Helgaas4987ce82013-04-17 17:42:30 -0600631 entry->msi_attrib.maskbit = !!(control & PCI_MSI_FLAGS_MASKBIT);
Hidetoshi Seto500559a2009-08-10 10:14:15 +0900632 entry->msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */
Gavin Shanf4651362013-04-04 16:54:32 +0000633 entry->msi_attrib.pos = dev->msi_cap;
Hidetoshi Seto0db29af2008-12-24 17:27:04 +0900634
Dan Carpentere5f66ea2013-04-30 10:44:54 +0300635 if (control & PCI_MSI_FLAGS_64BIT)
636 entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_64;
637 else
638 entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_32;
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400639 /* All MSIs are unmasked by default, Mask them all */
640 if (entry->msi_attrib.maskbit)
641 pci_read_config_dword(dev, entry->mask_pos, &entry->masked);
642 mask = msi_capable_mask(control);
643 msi_mask_irq(entry, mask, mask);
644
Eric W. Biederman0dd11f92007-06-01 00:46:32 -0700645 list_add_tail(&entry->list, &dev->msi_list);
Michael Ellerman9c831332007-04-18 19:39:21 +1000646
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 /* Configure MSI capability structure */
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400648 ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI);
Michael Ellerman7fe37302007-04-18 19:39:21 +1000649 if (ret) {
Hidetoshi Seto7ba19302009-06-23 17:39:27 +0900650 msi_mask_irq(entry, mask, ~mask);
Hidetoshi Setof56e4482009-08-06 11:32:51 +0900651 free_msi_irqs(dev);
Michael Ellerman7fe37302007-04-18 19:39:21 +1000652 return ret;
Mark Maulefd58e552006-04-10 21:17:48 -0500653 }
Eric W. Biedermanf7feaca2007-01-28 12:56:37 -0700654
Neil Hormanda8d1c82011-10-06 14:08:18 -0400655 ret = populate_msi_sysfs(dev);
656 if (ret) {
657 msi_mask_irq(entry, mask, ~mask);
658 free_msi_irqs(dev);
659 return ret;
660 }
661
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 /* Set MSI enabled bits */
David Millerba698ad2007-10-25 01:16:30 -0700663 pci_intx_for_msi(dev, 0);
Gavin Shane375b562013-04-04 16:54:30 +0000664 msi_set_enable(dev, 1);
Eric W. Biedermanb1cbf4e2007-03-05 00:30:10 -0800665 dev->msi_enabled = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
Michael Ellerman7fe37302007-04-18 19:39:21 +1000667 dev->irq = entry->irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 return 0;
669}
670
Gavin Shan520fe9d2013-04-04 16:54:33 +0000671static void __iomem *msix_map_region(struct pci_dev *dev, unsigned nr_entries)
Hidetoshi Seto5a05a9d2009-08-06 11:34:34 +0900672{
Kenji Kaneshige4302e0f2010-06-17 10:42:44 +0900673 resource_size_t phys_addr;
Hidetoshi Seto5a05a9d2009-08-06 11:34:34 +0900674 u32 table_offset;
675 u8 bir;
676
Bjorn Helgaas909094c2013-04-17 17:43:40 -0600677 pci_read_config_dword(dev, dev->msix_cap + PCI_MSIX_TABLE,
678 &table_offset);
Bjorn Helgaas4d187602013-04-17 18:10:07 -0600679 bir = (u8)(table_offset & PCI_MSIX_TABLE_BIR);
680 table_offset &= PCI_MSIX_TABLE_OFFSET;
Hidetoshi Seto5a05a9d2009-08-06 11:34:34 +0900681 phys_addr = pci_resource_start(dev, bir) + table_offset;
682
683 return ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
684}
685
Gavin Shan520fe9d2013-04-04 16:54:33 +0000686static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
687 struct msix_entry *entries, int nvec)
Hidetoshi Setod9d70702009-08-06 11:35:48 +0900688{
689 struct msi_desc *entry;
690 int i;
691
692 for (i = 0; i < nvec; i++) {
693 entry = alloc_msi_entry(dev);
694 if (!entry) {
695 if (!i)
696 iounmap(base);
697 else
698 free_msi_irqs(dev);
699 /* No enough memory. Don't try again */
700 return -ENOMEM;
701 }
702
703 entry->msi_attrib.is_msix = 1;
704 entry->msi_attrib.is_64 = 1;
705 entry->msi_attrib.entry_nr = entries[i].entry;
706 entry->msi_attrib.default_irq = dev->irq;
Gavin Shan520fe9d2013-04-04 16:54:33 +0000707 entry->msi_attrib.pos = dev->msix_cap;
Hidetoshi Setod9d70702009-08-06 11:35:48 +0900708 entry->mask_base = base;
709
710 list_add_tail(&entry->list, &dev->msi_list);
711 }
712
713 return 0;
714}
715
Hidetoshi Seto75cb3422009-08-06 11:35:10 +0900716static void msix_program_entries(struct pci_dev *dev,
Gavin Shan520fe9d2013-04-04 16:54:33 +0000717 struct msix_entry *entries)
Hidetoshi Seto75cb3422009-08-06 11:35:10 +0900718{
719 struct msi_desc *entry;
720 int i = 0;
721
722 list_for_each_entry(entry, &dev->msi_list, list) {
723 int offset = entries[i].entry * PCI_MSIX_ENTRY_SIZE +
724 PCI_MSIX_ENTRY_VECTOR_CTRL;
725
726 entries[i].vector = entry->irq;
Thomas Gleixnerdced35a2011-03-28 17:49:12 +0200727 irq_set_msi_desc(entry->irq, entry);
Hidetoshi Seto75cb3422009-08-06 11:35:10 +0900728 entry->masked = readl(entry->mask_base + offset);
729 msix_mask_irq(entry, 1);
730 i++;
731 }
732}
733
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734/**
735 * msix_capability_init - configure device's MSI-X capability
736 * @dev: pointer to the pci_dev data structure of MSI-X device function
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700737 * @entries: pointer to an array of struct msix_entry entries
738 * @nvec: number of @entries
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 *
Steven Coleeaae4b32005-05-03 18:38:30 -0600740 * Setup the MSI-X capability structure of device function with a
Eric W. Biederman1ce03372006-10-04 02:16:41 -0700741 * single MSI-X irq. A return of zero indicates the successful setup of
742 * requested MSI-X entries with allocated irqs or non-zero for otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 **/
744static int msix_capability_init(struct pci_dev *dev,
745 struct msix_entry *entries, int nvec)
746{
Gavin Shan520fe9d2013-04-04 16:54:33 +0000747 int ret;
Hidetoshi Seto5a05a9d2009-08-06 11:34:34 +0900748 u16 control;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 void __iomem *base;
750
Gavin Shan520fe9d2013-04-04 16:54:33 +0000751 pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
Matthew Wilcoxf5982822009-06-18 19:15:59 -0700752
753 /* Ensure MSI-X is disabled while it is set up */
754 control &= ~PCI_MSIX_FLAGS_ENABLE;
Gavin Shan520fe9d2013-04-04 16:54:33 +0000755 pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, control);
Matthew Wilcoxf5982822009-06-18 19:15:59 -0700756
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 /* Request & Map MSI-X table region */
Bjorn Helgaas527eee22013-04-17 17:44:48 -0600758 base = msix_map_region(dev, msix_table_size(control));
Hidetoshi Seto5a05a9d2009-08-06 11:34:34 +0900759 if (!base)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 return -ENOMEM;
761
Gavin Shan520fe9d2013-04-04 16:54:33 +0000762 ret = msix_setup_entries(dev, base, entries, nvec);
Hidetoshi Setod9d70702009-08-06 11:35:48 +0900763 if (ret)
764 return ret;
Michael Ellerman9c831332007-04-18 19:39:21 +1000765
766 ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
Hidetoshi Seto583871d2009-08-06 11:33:39 +0900767 if (ret)
Alexander Gordeev2adc7902013-12-16 09:34:56 +0100768 goto out_avail;
Michael Ellerman9c831332007-04-18 19:39:21 +1000769
Matthew Wilcoxf5982822009-06-18 19:15:59 -0700770 /*
771 * Some devices require MSI-X to be enabled before we can touch the
772 * MSI-X registers. We need to mask all the vectors to prevent
773 * interrupts coming in before they're fully set up.
774 */
775 control |= PCI_MSIX_FLAGS_MASKALL | PCI_MSIX_FLAGS_ENABLE;
Gavin Shan520fe9d2013-04-04 16:54:33 +0000776 pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, control);
Matthew Wilcoxf5982822009-06-18 19:15:59 -0700777
Hidetoshi Seto75cb3422009-08-06 11:35:10 +0900778 msix_program_entries(dev, entries);
Matthew Wilcoxf5982822009-06-18 19:15:59 -0700779
Neil Hormanda8d1c82011-10-06 14:08:18 -0400780 ret = populate_msi_sysfs(dev);
Alexander Gordeev2adc7902013-12-16 09:34:56 +0100781 if (ret)
782 goto out_free;
Neil Hormanda8d1c82011-10-06 14:08:18 -0400783
Matthew Wilcoxf5982822009-06-18 19:15:59 -0700784 /* Set MSI-X enabled bits and unmask the function */
David Millerba698ad2007-10-25 01:16:30 -0700785 pci_intx_for_msi(dev, 0);
Eric W. Biedermanb1cbf4e2007-03-05 00:30:10 -0800786 dev->msix_enabled = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Matthew Wilcoxf5982822009-06-18 19:15:59 -0700788 control &= ~PCI_MSIX_FLAGS_MASKALL;
Gavin Shan520fe9d2013-04-04 16:54:33 +0000789 pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, control);
Matthew Wilcox8d181012009-05-08 07:13:33 -0600790
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 return 0;
Hidetoshi Seto583871d2009-08-06 11:33:39 +0900792
Alexander Gordeev2adc7902013-12-16 09:34:56 +0100793out_avail:
Hidetoshi Seto583871d2009-08-06 11:33:39 +0900794 if (ret < 0) {
795 /*
796 * If we had some success, report the number of irqs
797 * we succeeded in setting up.
798 */
Hidetoshi Setod9d70702009-08-06 11:35:48 +0900799 struct msi_desc *entry;
Hidetoshi Seto583871d2009-08-06 11:33:39 +0900800 int avail = 0;
801
802 list_for_each_entry(entry, &dev->msi_list, list) {
803 if (entry->irq != 0)
804 avail++;
805 }
806 if (avail != 0)
807 ret = avail;
808 }
809
Alexander Gordeev2adc7902013-12-16 09:34:56 +0100810out_free:
Hidetoshi Seto583871d2009-08-06 11:33:39 +0900811 free_msi_irqs(dev);
812
813 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814}
815
816/**
Michael Ellerman17bbc122007-04-05 17:19:07 +1000817 * pci_msi_check_device - check whether MSI may be enabled on a device
Brice Goglin24334a12006-08-31 01:55:07 -0400818 * @dev: pointer to the pci_dev data structure of MSI device function
Michael Ellermanc9953a72007-04-05 17:19:08 +1000819 * @nvec: how many MSIs have been requested ?
Michael Ellermanb1e23032007-03-22 21:51:39 +1100820 * @type: are we checking for MSI or MSI-X ?
Brice Goglin24334a12006-08-31 01:55:07 -0400821 *
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700822 * Look at global flags, the device itself, and its parent buses
Michael Ellerman17bbc122007-04-05 17:19:07 +1000823 * to determine if MSI/-X are supported for the device. If MSI/-X is
824 * supported return 0, else return an error code.
Brice Goglin24334a12006-08-31 01:55:07 -0400825 **/
Hidetoshi Seto500559a2009-08-10 10:14:15 +0900826static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type)
Brice Goglin24334a12006-08-31 01:55:07 -0400827{
828 struct pci_bus *bus;
Michael Ellermanc9953a72007-04-05 17:19:08 +1000829 int ret;
Brice Goglin24334a12006-08-31 01:55:07 -0400830
Brice Goglin0306ebf2006-10-05 10:24:31 +0200831 /* MSI must be globally enabled and supported by the device */
Brice Goglin24334a12006-08-31 01:55:07 -0400832 if (!pci_msi_enable || !dev || dev->no_msi)
833 return -EINVAL;
834
Michael Ellerman314e77b2007-04-05 17:19:12 +1000835 /*
836 * You can't ask to have 0 or less MSIs configured.
837 * a) it's stupid ..
838 * b) the list manipulation code assumes nvec >= 1.
839 */
840 if (nvec < 1)
841 return -ERANGE;
842
Hidetoshi Seto500559a2009-08-10 10:14:15 +0900843 /*
844 * Any bridge which does NOT route MSI transactions from its
845 * secondary bus to its primary bus must set NO_MSI flag on
Brice Goglin0306ebf2006-10-05 10:24:31 +0200846 * the secondary pci_bus.
847 * We expect only arch-specific PCI host bus controller driver
848 * or quirks for specific PCI bridges to be setting NO_MSI.
849 */
Brice Goglin24334a12006-08-31 01:55:07 -0400850 for (bus = dev->bus; bus; bus = bus->parent)
851 if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
852 return -EINVAL;
853
Michael Ellermanc9953a72007-04-05 17:19:08 +1000854 ret = arch_msi_check_device(dev, nvec, type);
855 if (ret)
856 return ret;
857
Brice Goglin24334a12006-08-31 01:55:07 -0400858 return 0;
859}
860
861/**
Alexander Gordeevd1ac1d22013-12-30 08:28:13 +0100862 * pci_msi_vec_count - Return the number of MSI vectors a device can send
863 * @dev: device to report about
864 *
865 * This function returns the number of MSI vectors a device requested via
866 * Multiple Message Capable register. It returns a negative errno if the
867 * device is not capable sending MSI interrupts. Otherwise, the call succeeds
868 * and returns a power of two, up to a maximum of 2^5 (32), according to the
869 * MSI specification.
870 **/
871int pci_msi_vec_count(struct pci_dev *dev)
872{
873 int ret;
874 u16 msgctl;
875
876 if (!dev->msi_cap)
877 return -EINVAL;
878
879 pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &msgctl);
880 ret = 1 << ((msgctl & PCI_MSI_FLAGS_QMASK) >> 1);
881
882 return ret;
883}
884EXPORT_SYMBOL(pci_msi_vec_count);
885
886/**
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400887 * pci_enable_msi_block - configure device's MSI capability structure
888 * @dev: device to configure
889 * @nvec: number of interrupts to configure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 *
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400891 * Allocate IRQs for a device with the MSI capability.
892 * This function returns a negative errno if an error occurs. If it
893 * is unable to allocate the number of interrupts requested, it returns
894 * the number of interrupts it might be able to allocate. If it successfully
895 * allocates at least the number of interrupts requested, it returns 0 and
896 * updates the @dev's irq member to the lowest new interrupt number; the
897 * other interrupt numbers allocated to this device are consecutive.
898 */
Alexander Gordeev52179dc2013-12-16 09:34:58 +0100899int pci_enable_msi_block(struct pci_dev *dev, int nvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900{
Gavin Shanf4651362013-04-04 16:54:32 +0000901 int status, maxvec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
Alexander Gordeevd1ac1d22013-12-30 08:28:13 +0100903 if (dev->current_state != PCI_D0)
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400904 return -EINVAL;
Gavin Shanf4651362013-04-04 16:54:32 +0000905
Alexander Gordeevd1ac1d22013-12-30 08:28:13 +0100906 maxvec = pci_msi_vec_count(dev);
907 if (maxvec < 0)
908 return maxvec;
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400909 if (nvec > maxvec)
910 return maxvec;
911
912 status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSI);
Michael Ellermanc9953a72007-04-05 17:19:08 +1000913 if (status)
914 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915
Eric W. Biedermanded86d82007-01-28 12:42:52 -0700916 WARN_ON(!!dev->msi_enabled);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400918 /* Check whether driver already requested MSI-X irqs */
Eric W. Biedermanb1cbf4e2007-03-05 00:30:10 -0800919 if (dev->msix_enabled) {
Bjorn Helgaas80ccba12008-06-13 10:52:11 -0600920 dev_info(&dev->dev, "can't enable MSI "
921 "(MSI-X already enabled)\n");
Eric W. Biedermanb1cbf4e2007-03-05 00:30:10 -0800922 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 }
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400924
925 status = msi_capability_init(dev, nvec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 return status;
927}
Matthew Wilcox1c8d7b02009-03-17 08:54:10 -0400928EXPORT_SYMBOL(pci_enable_msi_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400930void pci_msi_shutdown(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931{
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400932 struct msi_desc *desc;
933 u32 mask;
934 u16 ctrl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935
Michael Ellerman128bc5f2007-03-22 21:51:39 +1100936 if (!pci_msi_enable || !dev || !dev->msi_enabled)
Eric W. Biedermanded86d82007-01-28 12:42:52 -0700937 return;
938
Matthew Wilcox110828c2009-06-16 06:31:45 -0600939 BUG_ON(list_empty(&dev->msi_list));
940 desc = list_first_entry(&dev->msi_list, struct msi_desc, list);
Matthew Wilcox110828c2009-06-16 06:31:45 -0600941
Gavin Shane375b562013-04-04 16:54:30 +0000942 msi_set_enable(dev, 0);
David Millerba698ad2007-10-25 01:16:30 -0700943 pci_intx_for_msi(dev, 1);
Eric W. Biedermanb1cbf4e2007-03-05 00:30:10 -0800944 dev->msi_enabled = 0;
Eric W. Biederman7bd007e2006-10-04 02:16:31 -0700945
Hidetoshi Seto12abb8b2009-06-24 12:08:09 +0900946 /* Return the device with MSI unmasked as initial states */
Bjorn Helgaasf5322162013-04-17 17:34:36 -0600947 pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &ctrl);
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400948 mask = msi_capable_mask(ctrl);
Hidetoshi Seto12abb8b2009-06-24 12:08:09 +0900949 /* Keep cached state to be restored */
Konrad Rzeszutek Wilk0e4ccb12013-11-06 16:16:56 -0500950 arch_msi_mask_irq(desc, mask, ~mask);
Michael Ellermane387b9e2007-03-22 21:51:27 +1100951
952 /* Restore dev->irq to its default pin-assertion irq */
Matthew Wilcoxf2440d92009-03-17 08:54:09 -0400953 dev->irq = desc->msi_attrib.default_irq;
Yinghai Lud52877c2008-04-23 14:58:09 -0700954}
Matthew Wilcox24d27552009-03-17 08:54:06 -0400955
Hidetoshi Seto500559a2009-08-10 10:14:15 +0900956void pci_disable_msi(struct pci_dev *dev)
Yinghai Lud52877c2008-04-23 14:58:09 -0700957{
Yinghai Lud52877c2008-04-23 14:58:09 -0700958 if (!pci_msi_enable || !dev || !dev->msi_enabled)
959 return;
960
961 pci_msi_shutdown(dev);
Hidetoshi Setof56e4482009-08-06 11:32:51 +0900962 free_msi_irqs(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963}
Michael Ellerman4cc086f2007-03-22 21:51:34 +1100964EXPORT_SYMBOL(pci_disable_msi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966/**
Alexander Gordeevff1aa432013-12-30 08:28:15 +0100967 * pci_msix_vec_count - return the number of device's MSI-X table entries
Rafael J. Wysockia52e2e32009-01-24 00:21:14 +0100968 * @dev: pointer to the pci_dev data structure of MSI-X device function
Alexander Gordeevff1aa432013-12-30 08:28:15 +0100969 * This function returns the number of device's MSI-X table entries and
970 * therefore the number of MSI-X vectors device is capable of sending.
971 * It returns a negative errno if the device is not capable of sending MSI-X
972 * interrupts.
973 **/
974int pci_msix_vec_count(struct pci_dev *dev)
Rafael J. Wysockia52e2e32009-01-24 00:21:14 +0100975{
Rafael J. Wysockia52e2e32009-01-24 00:21:14 +0100976 u16 control;
977
Gavin Shan520fe9d2013-04-04 16:54:33 +0000978 if (!dev->msix_cap)
Alexander Gordeevff1aa432013-12-30 08:28:15 +0100979 return -EINVAL;
Rafael J. Wysockia52e2e32009-01-24 00:21:14 +0100980
Bjorn Helgaasf84ecd22013-04-17 17:38:32 -0600981 pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
Bjorn Helgaas527eee22013-04-17 17:44:48 -0600982 return msix_table_size(control);
Rafael J. Wysockia52e2e32009-01-24 00:21:14 +0100983}
Alexander Gordeevff1aa432013-12-30 08:28:15 +0100984EXPORT_SYMBOL(pci_msix_vec_count);
Rafael J. Wysockia52e2e32009-01-24 00:21:14 +0100985
986/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 * pci_enable_msix - configure device's MSI-X capability structure
988 * @dev: pointer to the pci_dev data structure of MSI-X device function
Greg Kroah-Hartman70549ad2005-06-06 23:07:46 -0700989 * @entries: pointer to an array of MSI-X entries
Eric W. Biederman1ce03372006-10-04 02:16:41 -0700990 * @nvec: number of MSI-X irqs requested for allocation by device driver
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 *
992 * Setup the MSI-X capability structure of device function with the number
Eric W. Biederman1ce03372006-10-04 02:16:41 -0700993 * of requested irqs upon its software driver call to request for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 * MSI-X mode enabled on its hardware device function. A return of zero
995 * indicates the successful configuration of MSI-X capability structure
Eric W. Biederman1ce03372006-10-04 02:16:41 -0700996 * with new allocated MSI-X irqs. A return of < 0 indicates a failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 * Or a return of > 0 indicates that driver request is exceeding the number
Michael S. Tsirkin57fbf522009-05-07 11:28:41 +0300998 * of irqs or MSI-X vectors available. Driver should use the returned value to
999 * re-send its request.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 **/
Hidetoshi Seto500559a2009-08-10 10:14:15 +09001001int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002{
Rafael J. Wysockia52e2e32009-01-24 00:21:14 +01001003 int status, nr_entries;
Eric W. Biedermanded86d82007-01-28 12:42:52 -07001004 int i, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005
Yijing Wang869a1612013-10-10 20:58:11 +08001006 if (!entries || !dev->msix_cap || dev->current_state != PCI_D0)
Hidetoshi Seto500559a2009-08-10 10:14:15 +09001007 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008
Michael Ellermanc9953a72007-04-05 17:19:08 +10001009 status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSIX);
1010 if (status)
1011 return status;
1012
Alexander Gordeevff1aa432013-12-30 08:28:15 +01001013 nr_entries = pci_msix_vec_count(dev);
1014 if (nr_entries < 0)
1015 return nr_entries;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 if (nvec > nr_entries)
Michael S. Tsirkin57fbf522009-05-07 11:28:41 +03001017 return nr_entries;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018
1019 /* Check for any invalid entries */
1020 for (i = 0; i < nvec; i++) {
1021 if (entries[i].entry >= nr_entries)
1022 return -EINVAL; /* invalid entry */
1023 for (j = i + 1; j < nvec; j++) {
1024 if (entries[i].entry == entries[j].entry)
1025 return -EINVAL; /* duplicate entry */
1026 }
1027 }
Eric W. Biedermanded86d82007-01-28 12:42:52 -07001028 WARN_ON(!!dev->msix_enabled);
Eric W. Biederman7bd007e2006-10-04 02:16:31 -07001029
Eric W. Biederman1ce03372006-10-04 02:16:41 -07001030 /* Check whether driver already requested for MSI irq */
Hidetoshi Seto500559a2009-08-10 10:14:15 +09001031 if (dev->msi_enabled) {
Bjorn Helgaas80ccba12008-06-13 10:52:11 -06001032 dev_info(&dev->dev, "can't enable MSI-X "
1033 "(MSI IRQ already assigned)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 return -EINVAL;
1035 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 status = msix_capability_init(dev, entries, nvec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 return status;
1038}
Michael Ellerman4cc086f2007-03-22 21:51:34 +11001039EXPORT_SYMBOL(pci_enable_msix);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040
Hidetoshi Seto500559a2009-08-10 10:14:15 +09001041void pci_msix_shutdown(struct pci_dev *dev)
Michael Ellermanfc4afc72007-03-22 21:51:33 +11001042{
Hidetoshi Seto12abb8b2009-06-24 12:08:09 +09001043 struct msi_desc *entry;
1044
Michael Ellerman128bc5f2007-03-22 21:51:39 +11001045 if (!pci_msi_enable || !dev || !dev->msix_enabled)
Eric W. Biedermanded86d82007-01-28 12:42:52 -07001046 return;
1047
Hidetoshi Seto12abb8b2009-06-24 12:08:09 +09001048 /* Return the device with MSI-X masked as initial states */
1049 list_for_each_entry(entry, &dev->msi_list, list) {
1050 /* Keep cached states to be restored */
Konrad Rzeszutek Wilk0e4ccb12013-11-06 16:16:56 -05001051 arch_msix_mask_irq(entry, 1);
Hidetoshi Seto12abb8b2009-06-24 12:08:09 +09001052 }
1053
Eric W. Biedermanb1cbf4e2007-03-05 00:30:10 -08001054 msix_set_enable(dev, 0);
David Millerba698ad2007-10-25 01:16:30 -07001055 pci_intx_for_msi(dev, 1);
Eric W. Biedermanb1cbf4e2007-03-05 00:30:10 -08001056 dev->msix_enabled = 0;
Yinghai Lud52877c2008-04-23 14:58:09 -07001057}
Hidetoshi Setoc9018512009-08-06 11:31:27 +09001058
Hidetoshi Seto500559a2009-08-10 10:14:15 +09001059void pci_disable_msix(struct pci_dev *dev)
Yinghai Lud52877c2008-04-23 14:58:09 -07001060{
1061 if (!pci_msi_enable || !dev || !dev->msix_enabled)
1062 return;
1063
1064 pci_msix_shutdown(dev);
Hidetoshi Setof56e4482009-08-06 11:32:51 +09001065 free_msi_irqs(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066}
Michael Ellerman4cc086f2007-03-22 21:51:34 +11001067EXPORT_SYMBOL(pci_disable_msix);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068
1069/**
Eric W. Biederman1ce03372006-10-04 02:16:41 -07001070 * msi_remove_pci_irq_vectors - reclaim MSI(X) irqs to unused state
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 * @dev: pointer to the pci_dev data structure of MSI(X) device function
1072 *
Steven Coleeaae4b32005-05-03 18:38:30 -06001073 * Being called during hotplug remove, from which the device function
Eric W. Biederman1ce03372006-10-04 02:16:41 -07001074 * is hot-removed. All previous assigned MSI/MSI-X irqs, if
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 * allocated for this device function, are reclaimed to unused state,
1076 * which may be used later on.
1077 **/
Hidetoshi Seto500559a2009-08-10 10:14:15 +09001078void msi_remove_pci_irq_vectors(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 if (!pci_msi_enable || !dev)
Hidetoshi Seto500559a2009-08-10 10:14:15 +09001081 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082
Hidetoshi Setof56e4482009-08-06 11:32:51 +09001083 if (dev->msi_enabled || dev->msix_enabled)
1084 free_msi_irqs(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085}
1086
Matthew Wilcox309e57d2006-03-05 22:33:34 -07001087void pci_no_msi(void)
1088{
1089 pci_msi_enable = 0;
1090}
Michael Ellermanc9953a72007-04-05 17:19:08 +10001091
Andrew Patterson07ae95f2008-11-10 15:31:05 -07001092/**
1093 * pci_msi_enabled - is MSI enabled?
1094 *
1095 * Returns true if MSI has not been disabled by the command-line option
1096 * pci=nomsi.
1097 **/
1098int pci_msi_enabled(void)
1099{
1100 return pci_msi_enable;
1101}
1102EXPORT_SYMBOL(pci_msi_enabled);
1103
Michael Ellerman4aa9bc92007-04-05 17:19:10 +10001104void pci_msi_init_pci_dev(struct pci_dev *dev)
1105{
1106 INIT_LIST_HEAD(&dev->msi_list);
Eric W. Biedermand5dea7d2011-10-17 11:46:06 -07001107
1108 /* Disable the msi hardware to avoid screaming interrupts
1109 * during boot. This is the power on reset default so
1110 * usually this should be a noop.
1111 */
Gavin Shane375b562013-04-04 16:54:30 +00001112 dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
1113 if (dev->msi_cap)
1114 msi_set_enable(dev, 0);
1115
1116 dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
1117 if (dev->msix_cap)
1118 msix_set_enable(dev, 0);
Michael Ellerman4aa9bc92007-04-05 17:19:10 +10001119}
Alexander Gordeev302a2522013-12-30 08:28:16 +01001120
1121/**
1122 * pci_enable_msi_range - configure device's MSI capability structure
1123 * @dev: device to configure
1124 * @minvec: minimal number of interrupts to configure
1125 * @maxvec: maximum number of interrupts to configure
1126 *
1127 * This function tries to allocate a maximum possible number of interrupts in a
1128 * range between @minvec and @maxvec. It returns a negative errno if an error
1129 * occurs. If it succeeds, it returns the actual number of interrupts allocated
1130 * and updates the @dev's irq member to the lowest new interrupt number;
1131 * the other interrupt numbers allocated to this device are consecutive.
1132 **/
1133int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec)
1134{
1135 int nvec = maxvec;
1136 int rc;
1137
1138 if (maxvec < minvec)
1139 return -ERANGE;
1140
1141 do {
1142 rc = pci_enable_msi_block(dev, nvec);
1143 if (rc < 0) {
1144 return rc;
1145 } else if (rc > 0) {
1146 if (rc < minvec)
1147 return -ENOSPC;
1148 nvec = rc;
1149 }
1150 } while (rc);
1151
1152 return nvec;
1153}
1154EXPORT_SYMBOL(pci_enable_msi_range);
1155
1156/**
1157 * pci_enable_msix_range - configure device's MSI-X capability structure
1158 * @dev: pointer to the pci_dev data structure of MSI-X device function
1159 * @entries: pointer to an array of MSI-X entries
1160 * @minvec: minimum number of MSI-X irqs requested
1161 * @maxvec: maximum number of MSI-X irqs requested
1162 *
1163 * Setup the MSI-X capability structure of device function with a maximum
1164 * possible number of interrupts in the range between @minvec and @maxvec
1165 * upon its software driver call to request for MSI-X mode enabled on its
1166 * hardware device function. It returns a negative errno if an error occurs.
1167 * If it succeeds, it returns the actual number of interrupts allocated and
1168 * indicates the successful configuration of MSI-X capability structure
1169 * with new allocated MSI-X interrupts.
1170 **/
1171int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
1172 int minvec, int maxvec)
1173{
1174 int nvec = maxvec;
1175 int rc;
1176
1177 if (maxvec < minvec)
1178 return -ERANGE;
1179
1180 do {
1181 rc = pci_enable_msix(dev, entries, nvec);
1182 if (rc < 0) {
1183 return rc;
1184 } else if (rc > 0) {
1185 if (rc < minvec)
1186 return -ENOSPC;
1187 nvec = rc;
1188 }
1189 } while (rc);
1190
1191 return nvec;
1192}
1193EXPORT_SYMBOL(pci_enable_msix_range);