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[PATCH] irq-flags: ARM26: Use the new IRQF_ constants
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / pci / msi.c
blob36bc7c415af7a8dfe8b0d394dc64913577d6ad96
1 /*
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
9 #include <linux/mm.h>
10 #include <linux/irq.h>
11 #include <linux/interrupt.h>
12 #include <linux/init.h>
13 #include <linux/ioport.h>
14 #include <linux/smp_lock.h>
15 #include <linux/pci.h>
16 #include <linux/proc_fs.h>
17
18 #include <asm/errno.h>
19 #include <asm/io.h>
20 #include <asm/smp.h>
21
22 #include "pci.h"
23 #include "msi.h"
24
25 static DEFINE_SPINLOCK(msi_lock);
26 static struct msi_desc* msi_desc[NR_IRQS] = { [0 ... NR_IRQS-1] = NULL };
27 static kmem_cache_t* msi_cachep;
28
29 static int pci_msi_enable = 1;
30 static int last_alloc_vector;
31 static int nr_released_vectors;
32 static int nr_reserved_vectors = NR_HP_RESERVED_VECTORS;
33 static int nr_msix_devices;
34
35 #ifndef CONFIG_X86_IO_APIC
36 int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1};
37 #endif
38
39 static struct msi_ops *msi_ops;
40
41 int
42 msi_register(struct msi_ops *ops)
43 {
44 msi_ops = ops;
45 return 0;
46 }
47
48 static void msi_cache_ctor(void *p, kmem_cache_t *cache, unsigned long flags)
49 {
50 memset(p, 0, NR_IRQS * sizeof(struct msi_desc));
51 }
52
53 static int msi_cache_init(void)
54 {
55 msi_cachep = kmem_cache_create("msi_cache",
56 NR_IRQS * sizeof(struct msi_desc),
57 0, SLAB_HWCACHE_ALIGN, msi_cache_ctor, NULL);
58 if (!msi_cachep)
59 return -ENOMEM;
60
61 return 0;
62 }
63
64 static void msi_set_mask_bit(unsigned int vector, int flag)
65 {
66 struct msi_desc *entry;
67
68 entry = (struct msi_desc *)msi_desc[vector];
69 if (!entry || !entry->dev || !entry->mask_base)
70 return;
71 switch (entry->msi_attrib.type) {
72 case PCI_CAP_ID_MSI:
73 {
74 int pos;
75 u32 mask_bits;
76
77 pos = (long)entry->mask_base;
78 pci_read_config_dword(entry->dev, pos, &mask_bits);
79 mask_bits &= ~(1);
80 mask_bits |= flag;
81 pci_write_config_dword(entry->dev, pos, mask_bits);
82 break;
83 }
84 case PCI_CAP_ID_MSIX:
85 {
86 int offset = entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
87 PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET;
88 writel(flag, entry->mask_base + offset);
89 break;
90 }
91 default:
92 break;
93 }
94 }
95
96 #ifdef CONFIG_SMP
97 static void set_msi_affinity(unsigned int vector, cpumask_t cpu_mask)
98 {
99 struct msi_desc *entry;
100 u32 address_hi, address_lo;
101 unsigned int irq = vector;
102 unsigned int dest_cpu = first_cpu(cpu_mask);
103
104 entry = (struct msi_desc *)msi_desc[vector];
105 if (!entry || !entry->dev)
106 return;
107
108 switch (entry->msi_attrib.type) {
109 case PCI_CAP_ID_MSI:
110 {
111 int pos = pci_find_capability(entry->dev, PCI_CAP_ID_MSI);
112
113 if (!pos)
114 return;
115
116 pci_read_config_dword(entry->dev, msi_upper_address_reg(pos),
117 &address_hi);
118 pci_read_config_dword(entry->dev, msi_lower_address_reg(pos),
119 &address_lo);
120
121 msi_ops->target(vector, dest_cpu, &address_hi, &address_lo);
122
123 pci_write_config_dword(entry->dev, msi_upper_address_reg(pos),
124 address_hi);
125 pci_write_config_dword(entry->dev, msi_lower_address_reg(pos),
126 address_lo);
127 set_native_irq_info(irq, cpu_mask);
128 break;
129 }
130 case PCI_CAP_ID_MSIX:
131 {
132 int offset_hi =
133 entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
134 PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET;
135 int offset_lo =
136 entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
137 PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET;
138
139 address_hi = readl(entry->mask_base + offset_hi);
140 address_lo = readl(entry->mask_base + offset_lo);
141
142 msi_ops->target(vector, dest_cpu, &address_hi, &address_lo);
143
144 writel(address_hi, entry->mask_base + offset_hi);
145 writel(address_lo, entry->mask_base + offset_lo);
146 set_native_irq_info(irq, cpu_mask);
147 break;
148 }
149 default:
150 break;
151 }
152 }
153 #else
154 #define set_msi_affinity NULL
155 #endif /* CONFIG_SMP */
156
157 static void mask_MSI_irq(unsigned int vector)
158 {
159 msi_set_mask_bit(vector, 1);
160 }
161
162 static void unmask_MSI_irq(unsigned int vector)
163 {
164 msi_set_mask_bit(vector, 0);
165 }
166
167 static unsigned int startup_msi_irq_wo_maskbit(unsigned int vector)
168 {
169 struct msi_desc *entry;
170 unsigned long flags;
171
172 spin_lock_irqsave(&msi_lock, flags);
173 entry = msi_desc[vector];
174 if (!entry || !entry->dev) {
175 spin_unlock_irqrestore(&msi_lock, flags);
176 return 0;
177 }
178 entry->msi_attrib.state = 1; /* Mark it active */
179 spin_unlock_irqrestore(&msi_lock, flags);
180
181 return 0; /* never anything pending */
182 }
183
184 static unsigned int startup_msi_irq_w_maskbit(unsigned int vector)
185 {
186 startup_msi_irq_wo_maskbit(vector);
187 unmask_MSI_irq(vector);
188 return 0; /* never anything pending */
189 }
190
191 static void shutdown_msi_irq(unsigned int vector)
192 {
193 struct msi_desc *entry;
194 unsigned long flags;
195
196 spin_lock_irqsave(&msi_lock, flags);
197 entry = msi_desc[vector];
198 if (entry && entry->dev)
199 entry->msi_attrib.state = 0; /* Mark it not active */
200 spin_unlock_irqrestore(&msi_lock, flags);
201 }
202
203 static void end_msi_irq_wo_maskbit(unsigned int vector)
204 {
205 move_native_irq(vector);
206 ack_APIC_irq();
207 }
208
209 static void end_msi_irq_w_maskbit(unsigned int vector)
210 {
211 move_native_irq(vector);
212 unmask_MSI_irq(vector);
213 ack_APIC_irq();
214 }
215
216 static void do_nothing(unsigned int vector)
217 {
218 }
219
220 /*
221 * Interrupt Type for MSI-X PCI/PCI-X/PCI-Express Devices,
222 * which implement the MSI-X Capability Structure.
223 */
224 static struct hw_interrupt_type msix_irq_type = {
225 .typename = "PCI-MSI-X",
226 .startup = startup_msi_irq_w_maskbit,
227 .shutdown = shutdown_msi_irq,
228 .enable = unmask_MSI_irq,
229 .disable = mask_MSI_irq,
230 .ack = mask_MSI_irq,
231 .end = end_msi_irq_w_maskbit,
232 .set_affinity = set_msi_affinity
233 };
234
235 /*
236 * Interrupt Type for MSI PCI/PCI-X/PCI-Express Devices,
237 * which implement the MSI Capability Structure with
238 * Mask-and-Pending Bits.
239 */
240 static struct hw_interrupt_type msi_irq_w_maskbit_type = {
241 .typename = "PCI-MSI",
242 .startup = startup_msi_irq_w_maskbit,
243 .shutdown = shutdown_msi_irq,
244 .enable = unmask_MSI_irq,
245 .disable = mask_MSI_irq,
246 .ack = mask_MSI_irq,
247 .end = end_msi_irq_w_maskbit,
248 .set_affinity = set_msi_affinity
249 };
250
251 /*
252 * Interrupt Type for MSI PCI/PCI-X/PCI-Express Devices,
253 * which implement the MSI Capability Structure without
254 * Mask-and-Pending Bits.
255 */
256 static struct hw_interrupt_type msi_irq_wo_maskbit_type = {
257 .typename = "PCI-MSI",
258 .startup = startup_msi_irq_wo_maskbit,
259 .shutdown = shutdown_msi_irq,
260 .enable = do_nothing,
261 .disable = do_nothing,
262 .ack = do_nothing,
263 .end = end_msi_irq_wo_maskbit,
264 .set_affinity = set_msi_affinity
265 };
266
267 static int msi_free_vector(struct pci_dev* dev, int vector, int reassign);
268 static int assign_msi_vector(void)
269 {
270 static int new_vector_avail = 1;
271 int vector;
272 unsigned long flags;
273
274 /*
275 * msi_lock is provided to ensure that successful allocation of MSI
276 * vector is assigned unique among drivers.
277 */
278 spin_lock_irqsave(&msi_lock, flags);
279
280 if (!new_vector_avail) {
281 int free_vector = 0;
282
283 /*
284 * vector_irq[] = -1 indicates that this specific vector is:
285 * - assigned for MSI (since MSI have no associated IRQ) or
286 * - assigned for legacy if less than 16, or
287 * - having no corresponding 1:1 vector-to-IOxAPIC IRQ mapping
288 * vector_irq[] = 0 indicates that this vector, previously
289 * assigned for MSI, is freed by hotplug removed operations.
290 * This vector will be reused for any subsequent hotplug added
291 * operations.
292 * vector_irq[] > 0 indicates that this vector is assigned for
293 * IOxAPIC IRQs. This vector and its value provides a 1-to-1
294 * vector-to-IOxAPIC IRQ mapping.
295 */
296 for (vector = FIRST_DEVICE_VECTOR; vector < NR_IRQS; vector++) {
297 if (vector_irq[vector] != 0)
298 continue;
299 free_vector = vector;
300 if (!msi_desc[vector])
301 break;
302 else
303 continue;
304 }
305 if (!free_vector) {
306 spin_unlock_irqrestore(&msi_lock, flags);
307 return -EBUSY;
308 }
309 vector_irq[free_vector] = -1;
310 nr_released_vectors--;
311 spin_unlock_irqrestore(&msi_lock, flags);
312 if (msi_desc[free_vector] != NULL) {
313 struct pci_dev *dev;
314 int tail;
315
316 /* free all linked vectors before re-assign */
317 do {
318 spin_lock_irqsave(&msi_lock, flags);
319 dev = msi_desc[free_vector]->dev;
320 tail = msi_desc[free_vector]->link.tail;
321 spin_unlock_irqrestore(&msi_lock, flags);
322 msi_free_vector(dev, tail, 1);
323 } while (free_vector != tail);
324 }
325
326 return free_vector;
327 }
328 vector = assign_irq_vector(AUTO_ASSIGN);
329 last_alloc_vector = vector;
330 if (vector == LAST_DEVICE_VECTOR)
331 new_vector_avail = 0;
332
333 spin_unlock_irqrestore(&msi_lock, flags);
334 return vector;
335 }
336
337 static int get_new_vector(void)
338 {
339 int vector = assign_msi_vector();
340
341 if (vector > 0)
342 set_intr_gate(vector, interrupt[vector]);
343
344 return vector;
345 }
346
347 static int msi_init(void)
348 {
349 static int status = -ENOMEM;
350
351 if (!status)
352 return status;
353
354 if (pci_msi_quirk) {
355 pci_msi_enable = 0;
356 printk(KERN_WARNING "PCI: MSI quirk detected. MSI disabled.\n");
357 status = -EINVAL;
358 return status;
359 }
360
361 status = msi_arch_init();
362 if (status < 0) {
363 pci_msi_enable = 0;
364 printk(KERN_WARNING
365 "PCI: MSI arch init failed. MSI disabled.\n");
366 return status;
367 }
368
369 if (! msi_ops) {
370 printk(KERN_WARNING
371 "PCI: MSI ops not registered. MSI disabled.\n");
372 status = -EINVAL;
373 return status;
374 }
375
376 last_alloc_vector = assign_irq_vector(AUTO_ASSIGN);
377 status = msi_cache_init();
378 if (status < 0) {
379 pci_msi_enable = 0;
380 printk(KERN_WARNING "PCI: MSI cache init failed\n");
381 return status;
382 }
383
384 if (last_alloc_vector < 0) {
385 pci_msi_enable = 0;
386 printk(KERN_WARNING "PCI: No interrupt vectors available for MSI\n");
387 status = -EBUSY;
388 return status;
389 }
390 vector_irq[last_alloc_vector] = 0;
391 nr_released_vectors++;
392
393 return status;
394 }
395
396 static int get_msi_vector(struct pci_dev *dev)
397 {
398 return get_new_vector();
399 }
400
401 static struct msi_desc* alloc_msi_entry(void)
402 {
403 struct msi_desc *entry;
404
405 entry = kmem_cache_alloc(msi_cachep, SLAB_KERNEL);
406 if (!entry)
407 return NULL;
408
409 memset(entry, 0, sizeof(struct msi_desc));
410 entry->link.tail = entry->link.head = 0; /* single message */
411 entry->dev = NULL;
412
413 return entry;
414 }
415
416 static void attach_msi_entry(struct msi_desc *entry, int vector)
417 {
418 unsigned long flags;
419
420 spin_lock_irqsave(&msi_lock, flags);
421 msi_desc[vector] = entry;
422 spin_unlock_irqrestore(&msi_lock, flags);
423 }
424
425 static void irq_handler_init(int cap_id, int pos, int mask)
426 {
427 unsigned long flags;
428
429 spin_lock_irqsave(&irq_desc[pos].lock, flags);
430 if (cap_id == PCI_CAP_ID_MSIX)
431 irq_desc[pos].chip = &msix_irq_type;
432 else {
433 if (!mask)
434 irq_desc[pos].chip = &msi_irq_wo_maskbit_type;
435 else
436 irq_desc[pos].chip = &msi_irq_w_maskbit_type;
437 }
438 spin_unlock_irqrestore(&irq_desc[pos].lock, flags);
439 }
440
441 static void enable_msi_mode(struct pci_dev *dev, int pos, int type)
442 {
443 u16 control;
444
445 pci_read_config_word(dev, msi_control_reg(pos), &control);
446 if (type == PCI_CAP_ID_MSI) {
447 /* Set enabled bits to single MSI & enable MSI_enable bit */
448 msi_enable(control, 1);
449 pci_write_config_word(dev, msi_control_reg(pos), control);
450 dev->msi_enabled = 1;
451 } else {
452 msix_enable(control);
453 pci_write_config_word(dev, msi_control_reg(pos), control);
454 dev->msix_enabled = 1;
455 }
456 if (pci_find_capability(dev, PCI_CAP_ID_EXP)) {
457 /* PCI Express Endpoint device detected */
458 pci_intx(dev, 0); /* disable intx */
459 }
460 }
461
462 void disable_msi_mode(struct pci_dev *dev, int pos, int type)
463 {
464 u16 control;
465
466 pci_read_config_word(dev, msi_control_reg(pos), &control);
467 if (type == PCI_CAP_ID_MSI) {
468 /* Set enabled bits to single MSI & enable MSI_enable bit */
469 msi_disable(control);
470 pci_write_config_word(dev, msi_control_reg(pos), control);
471 dev->msi_enabled = 0;
472 } else {
473 msix_disable(control);
474 pci_write_config_word(dev, msi_control_reg(pos), control);
475 dev->msix_enabled = 0;
476 }
477 if (pci_find_capability(dev, PCI_CAP_ID_EXP)) {
478 /* PCI Express Endpoint device detected */
479 pci_intx(dev, 1); /* enable intx */
480 }
481 }
482
483 static int msi_lookup_vector(struct pci_dev *dev, int type)
484 {
485 int vector;
486 unsigned long flags;
487
488 spin_lock_irqsave(&msi_lock, flags);
489 for (vector = FIRST_DEVICE_VECTOR; vector < NR_IRQS; vector++) {
490 if (!msi_desc[vector] || msi_desc[vector]->dev != dev ||
491 msi_desc[vector]->msi_attrib.type != type ||
492 msi_desc[vector]->msi_attrib.default_vector != dev->irq)
493 continue;
494 spin_unlock_irqrestore(&msi_lock, flags);
495 /* This pre-assigned MSI vector for this device
496 already exits. Override dev->irq with this vector */
497 dev->irq = vector;
498 return 0;
499 }
500 spin_unlock_irqrestore(&msi_lock, flags);
501
502 return -EACCES;
503 }
504
505 void pci_scan_msi_device(struct pci_dev *dev)
506 {
507 if (!dev)
508 return;
509
510 if (pci_find_capability(dev, PCI_CAP_ID_MSIX) > 0)
511 nr_msix_devices++;
512 else if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0)
513 nr_reserved_vectors++;
514 }
515
516 #ifdef CONFIG_PM
517 int pci_save_msi_state(struct pci_dev *dev)
518 {
519 int pos, i = 0;
520 u16 control;
521 struct pci_cap_saved_state *save_state;
522 u32 *cap;
523
524 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
525 if (pos <= 0 || dev->no_msi)
526 return 0;
527
528 pci_read_config_word(dev, msi_control_reg(pos), &control);
529 if (!(control & PCI_MSI_FLAGS_ENABLE))
530 return 0;
531
532 save_state = kzalloc(sizeof(struct pci_cap_saved_state) + sizeof(u32) * 5,
533 GFP_KERNEL);
534 if (!save_state) {
535 printk(KERN_ERR "Out of memory in pci_save_msi_state\n");
536 return -ENOMEM;
537 }
538 cap = &save_state->data[0];
539
540 pci_read_config_dword(dev, pos, &cap[i++]);
541 control = cap[0] >> 16;
542 pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, &cap[i++]);
543 if (control & PCI_MSI_FLAGS_64BIT) {
544 pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, &cap[i++]);
545 pci_read_config_dword(dev, pos + PCI_MSI_DATA_64, &cap[i++]);
546 } else
547 pci_read_config_dword(dev, pos + PCI_MSI_DATA_32, &cap[i++]);
548 if (control & PCI_MSI_FLAGS_MASKBIT)
549 pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT, &cap[i++]);
550 save_state->cap_nr = PCI_CAP_ID_MSI;
551 pci_add_saved_cap(dev, save_state);
552 return 0;
553 }
554
555 void pci_restore_msi_state(struct pci_dev *dev)
556 {
557 int i = 0, pos;
558 u16 control;
559 struct pci_cap_saved_state *save_state;
560 u32 *cap;
561
562 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_MSI);
563 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
564 if (!save_state || pos <= 0)
565 return;
566 cap = &save_state->data[0];
567
568 control = cap[i++] >> 16;
569 pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, cap[i++]);
570 if (control & PCI_MSI_FLAGS_64BIT) {
571 pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, cap[i++]);
572 pci_write_config_dword(dev, pos + PCI_MSI_DATA_64, cap[i++]);
573 } else
574 pci_write_config_dword(dev, pos + PCI_MSI_DATA_32, cap[i++]);
575 if (control & PCI_MSI_FLAGS_MASKBIT)
576 pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT, cap[i++]);
577 pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
578 enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
579 pci_remove_saved_cap(save_state);
580 kfree(save_state);
581 }
582
583 int pci_save_msix_state(struct pci_dev *dev)
584 {
585 int pos;
586 int temp;
587 int vector, head, tail = 0;
588 u16 control;
589 struct pci_cap_saved_state *save_state;
590
591 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
592 if (pos <= 0 || dev->no_msi)
593 return 0;
594
595 /* save the capability */
596 pci_read_config_word(dev, msi_control_reg(pos), &control);
597 if (!(control & PCI_MSIX_FLAGS_ENABLE))
598 return 0;
599 save_state = kzalloc(sizeof(struct pci_cap_saved_state) + sizeof(u16),
600 GFP_KERNEL);
601 if (!save_state) {
602 printk(KERN_ERR "Out of memory in pci_save_msix_state\n");
603 return -ENOMEM;
604 }
605 *((u16 *)&save_state->data[0]) = control;
606
607 /* save the table */
608 temp = dev->irq;
609 if (msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) {
610 kfree(save_state);
611 return -EINVAL;
612 }
613
614 vector = head = dev->irq;
615 while (head != tail) {
616 int j;
617 void __iomem *base;
618 struct msi_desc *entry;
619
620 entry = msi_desc[vector];
621 base = entry->mask_base;
622 j = entry->msi_attrib.entry_nr;
623
624 entry->address_lo_save =
625 readl(base + j * PCI_MSIX_ENTRY_SIZE +
626 PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
627 entry->address_hi_save =
628 readl(base + j * PCI_MSIX_ENTRY_SIZE +
629 PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
630 entry->data_save =
631 readl(base + j * PCI_MSIX_ENTRY_SIZE +
632 PCI_MSIX_ENTRY_DATA_OFFSET);
633
634 tail = msi_desc[vector]->link.tail;
635 vector = tail;
636 }
637 dev->irq = temp;
638
639 save_state->cap_nr = PCI_CAP_ID_MSIX;
640 pci_add_saved_cap(dev, save_state);
641 return 0;
642 }
643
644 void pci_restore_msix_state(struct pci_dev *dev)
645 {
646 u16 save;
647 int pos;
648 int vector, head, tail = 0;
649 void __iomem *base;
650 int j;
651 struct msi_desc *entry;
652 int temp;
653 struct pci_cap_saved_state *save_state;
654
655 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_MSIX);
656 if (!save_state)
657 return;
658 save = *((u16 *)&save_state->data[0]);
659 pci_remove_saved_cap(save_state);
660 kfree(save_state);
661
662 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
663 if (pos <= 0)
664 return;
665
666 /* route the table */
667 temp = dev->irq;
668 if (msi_lookup_vector(dev, PCI_CAP_ID_MSIX))
669 return;
670 vector = head = dev->irq;
671 while (head != tail) {
672 entry = msi_desc[vector];
673 base = entry->mask_base;
674 j = entry->msi_attrib.entry_nr;
675
676 writel(entry->address_lo_save,
677 base + j * PCI_MSIX_ENTRY_SIZE +
678 PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
679 writel(entry->address_hi_save,
680 base + j * PCI_MSIX_ENTRY_SIZE +
681 PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
682 writel(entry->data_save,
683 base + j * PCI_MSIX_ENTRY_SIZE +
684 PCI_MSIX_ENTRY_DATA_OFFSET);
685
686 tail = msi_desc[vector]->link.tail;
687 vector = tail;
688 }
689 dev->irq = temp;
690
691 pci_write_config_word(dev, msi_control_reg(pos), save);
692 enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
693 }
694 #endif
695
696 static int msi_register_init(struct pci_dev *dev, struct msi_desc *entry)
697 {
698 int status;
699 u32 address_hi;
700 u32 address_lo;
701 u32 data;
702 int pos, vector = dev->irq;
703 u16 control;
704
705 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
706 pci_read_config_word(dev, msi_control_reg(pos), &control);
707
708 /* Configure MSI capability structure */
709 status = msi_ops->setup(dev, vector, &address_hi, &address_lo, &data);
710 if (status < 0)
711 return status;
712
713 pci_write_config_dword(dev, msi_lower_address_reg(pos), address_lo);
714 if (is_64bit_address(control)) {
715 pci_write_config_dword(dev,
716 msi_upper_address_reg(pos), address_hi);
717 pci_write_config_word(dev,
718 msi_data_reg(pos, 1), data);
719 } else
720 pci_write_config_word(dev,
721 msi_data_reg(pos, 0), data);
722 if (entry->msi_attrib.maskbit) {
723 unsigned int maskbits, temp;
724 /* All MSIs are unmasked by default, Mask them all */
725 pci_read_config_dword(dev,
726 msi_mask_bits_reg(pos, is_64bit_address(control)),
727 &maskbits);
728 temp = (1 << multi_msi_capable(control));
729 temp = ((temp - 1) & ~temp);
730 maskbits |= temp;
731 pci_write_config_dword(dev,
732 msi_mask_bits_reg(pos, is_64bit_address(control)),
733 maskbits);
734 }
735
736 return 0;
737 }
738
739 /**
740 * msi_capability_init - configure device's MSI capability structure
741 * @dev: pointer to the pci_dev data structure of MSI device function
742 *
743 * Setup the MSI capability structure of device function with a single
744 * MSI vector, regardless of device function is capable of handling
745 * multiple messages. A return of zero indicates the successful setup
746 * of an entry zero with the new MSI vector or non-zero for otherwise.
747 **/
748 static int msi_capability_init(struct pci_dev *dev)
749 {
750 int status;
751 struct msi_desc *entry;
752 int pos, vector;
753 u16 control;
754
755 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
756 pci_read_config_word(dev, msi_control_reg(pos), &control);
757 /* MSI Entry Initialization */
758 entry = alloc_msi_entry();
759 if (!entry)
760 return -ENOMEM;
761
762 vector = get_msi_vector(dev);
763 if (vector < 0) {
764 kmem_cache_free(msi_cachep, entry);
765 return -EBUSY;
766 }
767 entry->link.head = vector;
768 entry->link.tail = vector;
769 entry->msi_attrib.type = PCI_CAP_ID_MSI;
770 entry->msi_attrib.state = 0; /* Mark it not active */
771 entry->msi_attrib.entry_nr = 0;
772 entry->msi_attrib.maskbit = is_mask_bit_support(control);
773 entry->msi_attrib.default_vector = dev->irq; /* Save IOAPIC IRQ */
774 dev->irq = vector;
775 entry->dev = dev;
776 if (is_mask_bit_support(control)) {
777 entry->mask_base = (void __iomem *)(long)msi_mask_bits_reg(pos,
778 is_64bit_address(control));
779 }
780 /* Replace with MSI handler */
781 irq_handler_init(PCI_CAP_ID_MSI, vector, entry->msi_attrib.maskbit);
782 /* Configure MSI capability structure */
783 status = msi_register_init(dev, entry);
784 if (status != 0) {
785 dev->irq = entry->msi_attrib.default_vector;
786 kmem_cache_free(msi_cachep, entry);
787 return status;
788 }
789
790 attach_msi_entry(entry, vector);
791 /* Set MSI enabled bits */
792 enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
793
794 return 0;
795 }
796
797 /**
798 * msix_capability_init - configure device's MSI-X capability
799 * @dev: pointer to the pci_dev data structure of MSI-X device function
800 * @entries: pointer to an array of struct msix_entry entries
801 * @nvec: number of @entries
802 *
803 * Setup the MSI-X capability structure of device function with a
804 * single MSI-X vector. A return of zero indicates the successful setup of
805 * requested MSI-X entries with allocated vectors or non-zero for otherwise.
806 **/
807 static int msix_capability_init(struct pci_dev *dev,
808 struct msix_entry *entries, int nvec)
809 {
810 struct msi_desc *head = NULL, *tail = NULL, *entry = NULL;
811 u32 address_hi;
812 u32 address_lo;
813 u32 data;
814 int status;
815 int vector, pos, i, j, nr_entries, temp = 0;
816 unsigned long phys_addr;
817 u32 table_offset;
818 u16 control;
819 u8 bir;
820 void __iomem *base;
821
822 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
823 /* Request & Map MSI-X table region */
824 pci_read_config_word(dev, msi_control_reg(pos), &control);
825 nr_entries = multi_msix_capable(control);
826
827 pci_read_config_dword(dev, msix_table_offset_reg(pos), &table_offset);
828 bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
829 table_offset &= ~PCI_MSIX_FLAGS_BIRMASK;
830 phys_addr = pci_resource_start (dev, bir) + table_offset;
831 base = ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
832 if (base == NULL)
833 return -ENOMEM;
834
835 /* MSI-X Table Initialization */
836 for (i = 0; i < nvec; i++) {
837 entry = alloc_msi_entry();
838 if (!entry)
839 break;
840 vector = get_msi_vector(dev);
841 if (vector < 0) {
842 kmem_cache_free(msi_cachep, entry);
843 break;
844 }
845
846 j = entries[i].entry;
847 entries[i].vector = vector;
848 entry->msi_attrib.type = PCI_CAP_ID_MSIX;
849 entry->msi_attrib.state = 0; /* Mark it not active */
850 entry->msi_attrib.entry_nr = j;
851 entry->msi_attrib.maskbit = 1;
852 entry->msi_attrib.default_vector = dev->irq;
853 entry->dev = dev;
854 entry->mask_base = base;
855 if (!head) {
856 entry->link.head = vector;
857 entry->link.tail = vector;
858 head = entry;
859 } else {
860 entry->link.head = temp;
861 entry->link.tail = tail->link.tail;
862 tail->link.tail = vector;
863 head->link.head = vector;
864 }
865 temp = vector;
866 tail = entry;
867 /* Replace with MSI-X handler */
868 irq_handler_init(PCI_CAP_ID_MSIX, vector, 1);
869 /* Configure MSI-X capability structure */
870 status = msi_ops->setup(dev, vector,
871 &address_hi,
872 &address_lo,
873 &data);
874 if (status < 0)
875 break;
876
877 writel(address_lo,
878 base + j * PCI_MSIX_ENTRY_SIZE +
879 PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
880 writel(address_hi,
881 base + j * PCI_MSIX_ENTRY_SIZE +
882 PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
883 writel(data,
884 base + j * PCI_MSIX_ENTRY_SIZE +
885 PCI_MSIX_ENTRY_DATA_OFFSET);
886 attach_msi_entry(entry, vector);
887 }
888 if (i != nvec) {
889 i--;
890 for (; i >= 0; i--) {
891 vector = (entries + i)->vector;
892 msi_free_vector(dev, vector, 0);
893 (entries + i)->vector = 0;
894 }
895 return -EBUSY;
896 }
897 /* Set MSI-X enabled bits */
898 enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
899
900 return 0;
901 }
902
903 /**
904 * pci_enable_msi - configure device's MSI capability structure
905 * @dev: pointer to the pci_dev data structure of MSI device function
906 *
907 * Setup the MSI capability structure of device function with
908 * a single MSI vector upon its software driver call to request for
909 * MSI mode enabled on its hardware device function. A return of zero
910 * indicates the successful setup of an entry zero with the new MSI
911 * vector or non-zero for otherwise.
912 **/
913 int pci_enable_msi(struct pci_dev* dev)
914 {
915 struct pci_bus *bus;
916 int pos, temp, status = -EINVAL;
917 u16 control;
918
919 if (!pci_msi_enable || !dev)
920 return status;
921
922 if (dev->no_msi)
923 return status;
924
925 for (bus = dev->bus; bus; bus = bus->parent)
926 if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
927 return -EINVAL;
928
929 temp = dev->irq;
930
931 status = msi_init();
932 if (status < 0)
933 return status;
934
935 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
936 if (!pos)
937 return -EINVAL;
938
939 if (!msi_lookup_vector(dev, PCI_CAP_ID_MSI)) {
940 /* Lookup Sucess */
941 unsigned long flags;
942
943 pci_read_config_word(dev, msi_control_reg(pos), &control);
944 if (control & PCI_MSI_FLAGS_ENABLE)
945 return 0; /* Already in MSI mode */
946 spin_lock_irqsave(&msi_lock, flags);
947 if (!vector_irq[dev->irq]) {
948 msi_desc[dev->irq]->msi_attrib.state = 0;
949 vector_irq[dev->irq] = -1;
950 nr_released_vectors--;
951 spin_unlock_irqrestore(&msi_lock, flags);
952 status = msi_register_init(dev, msi_desc[dev->irq]);
953 if (status == 0)
954 enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
955 return status;
956 }
957 spin_unlock_irqrestore(&msi_lock, flags);
958 dev->irq = temp;
959 }
960 /* Check whether driver already requested for MSI-X vectors */
961 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
962 if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) {
963 printk(KERN_INFO "PCI: %s: Can't enable MSI. "
964 "Device already has MSI-X vectors assigned\n",
965 pci_name(dev));
966 dev->irq = temp;
967 return -EINVAL;
968 }
969 status = msi_capability_init(dev);
970 if (!status) {
971 if (!pos)
972 nr_reserved_vectors--; /* Only MSI capable */
973 else if (nr_msix_devices > 0)
974 nr_msix_devices--; /* Both MSI and MSI-X capable,
975 but choose enabling MSI */
976 }
977
978 return status;
979 }
980
981 void pci_disable_msi(struct pci_dev* dev)
982 {
983 struct msi_desc *entry;
984 int pos, default_vector;
985 u16 control;
986 unsigned long flags;
987
988 if (!pci_msi_enable)
989 return;
990 if (!dev)
991 return;
992
993 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
994 if (!pos)
995 return;
996
997 pci_read_config_word(dev, msi_control_reg(pos), &control);
998 if (!(control & PCI_MSI_FLAGS_ENABLE))
999 return;
1000
1001 spin_lock_irqsave(&msi_lock, flags);
1002 entry = msi_desc[dev->irq];
1003 if (!entry || !entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI) {
1004 spin_unlock_irqrestore(&msi_lock, flags);
1005 return;
1006 }
1007 if (entry->msi_attrib.state) {
1008 spin_unlock_irqrestore(&msi_lock, flags);
1009 printk(KERN_WARNING "PCI: %s: pci_disable_msi() called without "
1010 "free_irq() on MSI vector %d\n",
1011 pci_name(dev), dev->irq);
1012 BUG_ON(entry->msi_attrib.state > 0);
1013 } else {
1014 vector_irq[dev->irq] = 0; /* free it */
1015 nr_released_vectors++;
1016 default_vector = entry->msi_attrib.default_vector;
1017 spin_unlock_irqrestore(&msi_lock, flags);
1018 /* Restore dev->irq to its default pin-assertion vector */
1019 dev->irq = default_vector;
1020 disable_msi_mode(dev, pci_find_capability(dev, PCI_CAP_ID_MSI),
1021 PCI_CAP_ID_MSI);
1022 }
1023 }
1024
1025 static int msi_free_vector(struct pci_dev* dev, int vector, int reassign)
1026 {
1027 struct msi_desc *entry;
1028 int head, entry_nr, type;
1029 void __iomem *base;
1030 unsigned long flags;
1031
1032 msi_ops->teardown(vector);
1033
1034 spin_lock_irqsave(&msi_lock, flags);
1035 entry = msi_desc[vector];
1036 if (!entry || entry->dev != dev) {
1037 spin_unlock_irqrestore(&msi_lock, flags);
1038 return -EINVAL;
1039 }
1040 type = entry->msi_attrib.type;
1041 entry_nr = entry->msi_attrib.entry_nr;
1042 head = entry->link.head;
1043 base = entry->mask_base;
1044 msi_desc[entry->link.head]->link.tail = entry->link.tail;
1045 msi_desc[entry->link.tail]->link.head = entry->link.head;
1046 entry->dev = NULL;
1047 if (!reassign) {
1048 vector_irq[vector] = 0;
1049 nr_released_vectors++;
1050 }
1051 msi_desc[vector] = NULL;
1052 spin_unlock_irqrestore(&msi_lock, flags);
1053
1054 kmem_cache_free(msi_cachep, entry);
1055
1056 if (type == PCI_CAP_ID_MSIX) {
1057 if (!reassign)
1058 writel(1, base +
1059 entry_nr * PCI_MSIX_ENTRY_SIZE +
1060 PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
1061
1062 if (head == vector)
1063 iounmap(base);
1064 }
1065
1066 return 0;
1067 }
1068
1069 static int reroute_msix_table(int head, struct msix_entry *entries, int *nvec)
1070 {
1071 int vector = head, tail = 0;
1072 int i, j = 0, nr_entries = 0;
1073 void __iomem *base;
1074 unsigned long flags;
1075
1076 spin_lock_irqsave(&msi_lock, flags);
1077 while (head != tail) {
1078 nr_entries++;
1079 tail = msi_desc[vector]->link.tail;
1080 if (entries[0].entry == msi_desc[vector]->msi_attrib.entry_nr)
1081 j = vector;
1082 vector = tail;
1083 }
1084 if (*nvec > nr_entries) {
1085 spin_unlock_irqrestore(&msi_lock, flags);
1086 *nvec = nr_entries;
1087 return -EINVAL;
1088 }
1089 vector = ((j > 0) ? j : head);
1090 for (i = 0; i < *nvec; i++) {
1091 j = msi_desc[vector]->msi_attrib.entry_nr;
1092 msi_desc[vector]->msi_attrib.state = 0; /* Mark it not active */
1093 vector_irq[vector] = -1; /* Mark it busy */
1094 nr_released_vectors--;
1095 entries[i].vector = vector;
1096 if (j != (entries + i)->entry) {
1097 base = msi_desc[vector]->mask_base;
1098 msi_desc[vector]->msi_attrib.entry_nr =
1099 (entries + i)->entry;
1100 writel( readl(base + j * PCI_MSIX_ENTRY_SIZE +
1101 PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET), base +
1102 (entries + i)->entry * PCI_MSIX_ENTRY_SIZE +
1103 PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
1104 writel( readl(base + j * PCI_MSIX_ENTRY_SIZE +
1105 PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET), base +
1106 (entries + i)->entry * PCI_MSIX_ENTRY_SIZE +
1107 PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
1108 writel( (readl(base + j * PCI_MSIX_ENTRY_SIZE +
1109 PCI_MSIX_ENTRY_DATA_OFFSET) & 0xff00) | vector,
1110 base + (entries+i)->entry*PCI_MSIX_ENTRY_SIZE +
1111 PCI_MSIX_ENTRY_DATA_OFFSET);
1112 }
1113 vector = msi_desc[vector]->link.tail;
1114 }
1115 spin_unlock_irqrestore(&msi_lock, flags);
1116
1117 return 0;
1118 }
1119
1120 /**
1121 * pci_enable_msix - configure device's MSI-X capability structure
1122 * @dev: pointer to the pci_dev data structure of MSI-X device function
1123 * @entries: pointer to an array of MSI-X entries
1124 * @nvec: number of MSI-X vectors requested for allocation by device driver
1125 *
1126 * Setup the MSI-X capability structure of device function with the number
1127 * of requested vectors upon its software driver call to request for
1128 * MSI-X mode enabled on its hardware device function. A return of zero
1129 * indicates the successful configuration of MSI-X capability structure
1130 * with new allocated MSI-X vectors. A return of < 0 indicates a failure.
1131 * Or a return of > 0 indicates that driver request is exceeding the number
1132 * of vectors available. Driver should use the returned value to re-send
1133 * its request.
1134 **/
1135 int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
1136 {
1137 struct pci_bus *bus;
1138 int status, pos, nr_entries, free_vectors;
1139 int i, j, temp;
1140 u16 control;
1141 unsigned long flags;
1142
1143 if (!pci_msi_enable || !dev || !entries)
1144 return -EINVAL;
1145
1146 if (dev->no_msi)
1147 return -EINVAL;
1148
1149 for (bus = dev->bus; bus; bus = bus->parent)
1150 if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
1151 return -EINVAL;
1152
1153 status = msi_init();
1154 if (status < 0)
1155 return status;
1156
1157 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
1158 if (!pos)
1159 return -EINVAL;
1160
1161 pci_read_config_word(dev, msi_control_reg(pos), &control);
1162 if (control & PCI_MSIX_FLAGS_ENABLE)
1163 return -EINVAL; /* Already in MSI-X mode */
1164
1165 nr_entries = multi_msix_capable(control);
1166 if (nvec > nr_entries)
1167 return -EINVAL;
1168
1169 /* Check for any invalid entries */
1170 for (i = 0; i < nvec; i++) {
1171 if (entries[i].entry >= nr_entries)
1172 return -EINVAL; /* invalid entry */
1173 for (j = i + 1; j < nvec; j++) {
1174 if (entries[i].entry == entries[j].entry)
1175 return -EINVAL; /* duplicate entry */
1176 }
1177 }
1178 temp = dev->irq;
1179 if (!msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) {
1180 /* Lookup Sucess */
1181 nr_entries = nvec;
1182 /* Reroute MSI-X table */
1183 if (reroute_msix_table(dev->irq, entries, &nr_entries)) {
1184 /* #requested > #previous-assigned */
1185 dev->irq = temp;
1186 return nr_entries;
1187 }
1188 dev->irq = temp;
1189 enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
1190 return 0;
1191 }
1192 /* Check whether driver already requested for MSI vector */
1193 if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0 &&
1194 !msi_lookup_vector(dev, PCI_CAP_ID_MSI)) {
1195 printk(KERN_INFO "PCI: %s: Can't enable MSI-X. "
1196 "Device already has an MSI vector assigned\n",
1197 pci_name(dev));
1198 dev->irq = temp;
1199 return -EINVAL;
1200 }
1201
1202 spin_lock_irqsave(&msi_lock, flags);
1203 /*
1204 * msi_lock is provided to ensure that enough vectors resources are
1205 * available before granting.
1206 */
1207 free_vectors = pci_vector_resources(last_alloc_vector,
1208 nr_released_vectors);
1209 /* Ensure that each MSI/MSI-X device has one vector reserved by
1210 default to avoid any MSI-X driver to take all available
1211 resources */
1212 free_vectors -= nr_reserved_vectors;
1213 /* Find the average of free vectors among MSI-X devices */
1214 if (nr_msix_devices > 0)
1215 free_vectors /= nr_msix_devices;
1216 spin_unlock_irqrestore(&msi_lock, flags);
1217
1218 if (nvec > free_vectors) {
1219 if (free_vectors > 0)
1220 return free_vectors;
1221 else
1222 return -EBUSY;
1223 }
1224
1225 status = msix_capability_init(dev, entries, nvec);
1226 if (!status && nr_msix_devices > 0)
1227 nr_msix_devices--;
1228
1229 return status;
1230 }
1231
1232 void pci_disable_msix(struct pci_dev* dev)
1233 {
1234 int pos, temp;
1235 u16 control;
1236
1237 if (!pci_msi_enable)
1238 return;
1239 if (!dev)
1240 return;
1241
1242 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
1243 if (!pos)
1244 return;
1245
1246 pci_read_config_word(dev, msi_control_reg(pos), &control);
1247 if (!(control & PCI_MSIX_FLAGS_ENABLE))
1248 return;
1249
1250 temp = dev->irq;
1251 if (!msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) {
1252 int state, vector, head, tail = 0, warning = 0;
1253 unsigned long flags;
1254
1255 vector = head = dev->irq;
1256 spin_lock_irqsave(&msi_lock, flags);
1257 while (head != tail) {
1258 state = msi_desc[vector]->msi_attrib.state;
1259 if (state)
1260 warning = 1;
1261 else {
1262 vector_irq[vector] = 0; /* free it */
1263 nr_released_vectors++;
1264 }
1265 tail = msi_desc[vector]->link.tail;
1266 vector = tail;
1267 }
1268 spin_unlock_irqrestore(&msi_lock, flags);
1269 if (warning) {
1270 dev->irq = temp;
1271 printk(KERN_WARNING "PCI: %s: pci_disable_msix() called without "
1272 "free_irq() on all MSI-X vectors\n",
1273 pci_name(dev));
1274 BUG_ON(warning > 0);
1275 } else {
1276 dev->irq = temp;
1277 disable_msi_mode(dev,
1278 pci_find_capability(dev, PCI_CAP_ID_MSIX),
1279 PCI_CAP_ID_MSIX);
1280
1281 }
1282 }
1283 }
1284
1285 /**
1286 * msi_remove_pci_irq_vectors - reclaim MSI(X) vectors to unused state
1287 * @dev: pointer to the pci_dev data structure of MSI(X) device function
1288 *
1289 * Being called during hotplug remove, from which the device function
1290 * is hot-removed. All previous assigned MSI/MSI-X vectors, if
1291 * allocated for this device function, are reclaimed to unused state,
1292 * which may be used later on.
1293 **/
1294 void msi_remove_pci_irq_vectors(struct pci_dev* dev)
1295 {
1296 int state, pos, temp;
1297 unsigned long flags;
1298
1299 if (!pci_msi_enable || !dev)
1300 return;
1301
1302 temp = dev->irq; /* Save IOAPIC IRQ */
1303 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
1304 if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSI)) {
1305 spin_lock_irqsave(&msi_lock, flags);
1306 state = msi_desc[dev->irq]->msi_attrib.state;
1307 spin_unlock_irqrestore(&msi_lock, flags);
1308 if (state) {
1309 printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() "
1310 "called without free_irq() on MSI vector %d\n",
1311 pci_name(dev), dev->irq);
1312 BUG_ON(state > 0);
1313 } else /* Release MSI vector assigned to this device */
1314 msi_free_vector(dev, dev->irq, 0);
1315 dev->irq = temp; /* Restore IOAPIC IRQ */
1316 }
1317 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
1318 if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) {
1319 int vector, head, tail = 0, warning = 0;
1320 void __iomem *base = NULL;
1321
1322 vector = head = dev->irq;
1323 while (head != tail) {
1324 spin_lock_irqsave(&msi_lock, flags);
1325 state = msi_desc[vector]->msi_attrib.state;
1326 tail = msi_desc[vector]->link.tail;
1327 base = msi_desc[vector]->mask_base;
1328 spin_unlock_irqrestore(&msi_lock, flags);
1329 if (state)
1330 warning = 1;
1331 else if (vector != head) /* Release MSI-X vector */
1332 msi_free_vector(dev, vector, 0);
1333 vector = tail;
1334 }
1335 msi_free_vector(dev, vector, 0);
1336 if (warning) {
1337 iounmap(base);
1338 printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() "
1339 "called without free_irq() on all MSI-X vectors\n",
1340 pci_name(dev));
1341 BUG_ON(warning > 0);
1342 }
1343 dev->irq = temp; /* Restore IOAPIC IRQ */
1344 }
1345 }
1346
1347 void pci_no_msi(void)
1348 {
1349 pci_msi_enable = 0;
1350 }
1351
1352 EXPORT_SYMBOL(pci_enable_msi);
1353 EXPORT_SYMBOL(pci_disable_msi);
1354 EXPORT_SYMBOL(pci_enable_msix);
1355 EXPORT_SYMBOL(pci_disable_msix);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree