Commit | Line | Data |
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1da177e4 LT |
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/config.h> | |
14 | #include <linux/ioport.h> | |
15 | #include <linux/smp_lock.h> | |
16 | #include <linux/pci.h> | |
17 | #include <linux/proc_fs.h> | |
18 | ||
19 | #include <asm/errno.h> | |
20 | #include <asm/io.h> | |
21 | #include <asm/smp.h> | |
22 | ||
23 | #include "pci.h" | |
24 | #include "msi.h" | |
25 | ||
b4033c17 AR |
26 | #define MSI_TARGET_CPU first_cpu(cpu_online_map) |
27 | ||
1da177e4 LT |
28 | static DEFINE_SPINLOCK(msi_lock); |
29 | static struct msi_desc* msi_desc[NR_IRQS] = { [0 ... NR_IRQS-1] = NULL }; | |
30 | static kmem_cache_t* msi_cachep; | |
31 | ||
32 | static int pci_msi_enable = 1; | |
70549ad9 GKH |
33 | static int last_alloc_vector; |
34 | static int nr_released_vectors; | |
1da177e4 | 35 | static int nr_reserved_vectors = NR_HP_RESERVED_VECTORS; |
70549ad9 | 36 | static int nr_msix_devices; |
1da177e4 LT |
37 | |
38 | #ifndef CONFIG_X86_IO_APIC | |
39 | int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1}; | |
40 | u8 irq_vector[NR_IRQ_VECTORS] = { FIRST_DEVICE_VECTOR , 0 }; | |
41 | #endif | |
42 | ||
43 | static void msi_cache_ctor(void *p, kmem_cache_t *cache, unsigned long flags) | |
44 | { | |
45 | memset(p, 0, NR_IRQS * sizeof(struct msi_desc)); | |
46 | } | |
47 | ||
48 | static int msi_cache_init(void) | |
49 | { | |
50 | msi_cachep = kmem_cache_create("msi_cache", | |
51 | NR_IRQS * sizeof(struct msi_desc), | |
52 | 0, SLAB_HWCACHE_ALIGN, msi_cache_ctor, NULL); | |
53 | if (!msi_cachep) | |
54 | return -ENOMEM; | |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
59 | static void msi_set_mask_bit(unsigned int vector, int flag) | |
60 | { | |
61 | struct msi_desc *entry; | |
62 | ||
63 | entry = (struct msi_desc *)msi_desc[vector]; | |
64 | if (!entry || !entry->dev || !entry->mask_base) | |
65 | return; | |
66 | switch (entry->msi_attrib.type) { | |
67 | case PCI_CAP_ID_MSI: | |
68 | { | |
69 | int pos; | |
70 | u32 mask_bits; | |
71 | ||
72 | pos = (long)entry->mask_base; | |
73 | pci_read_config_dword(entry->dev, pos, &mask_bits); | |
74 | mask_bits &= ~(1); | |
75 | mask_bits |= flag; | |
76 | pci_write_config_dword(entry->dev, pos, mask_bits); | |
77 | break; | |
78 | } | |
79 | case PCI_CAP_ID_MSIX: | |
80 | { | |
81 | int offset = entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE + | |
82 | PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET; | |
83 | writel(flag, entry->mask_base + offset); | |
84 | break; | |
85 | } | |
86 | default: | |
87 | break; | |
88 | } | |
89 | } | |
90 | ||
91 | #ifdef CONFIG_SMP | |
92 | static void set_msi_affinity(unsigned int vector, cpumask_t cpu_mask) | |
93 | { | |
94 | struct msi_desc *entry; | |
95 | struct msg_address address; | |
54d5d424 | 96 | unsigned int irq = vector; |
b4033c17 | 97 | unsigned int dest_cpu = first_cpu(cpu_mask); |
1da177e4 LT |
98 | |
99 | entry = (struct msi_desc *)msi_desc[vector]; | |
100 | if (!entry || !entry->dev) | |
101 | return; | |
102 | ||
103 | switch (entry->msi_attrib.type) { | |
104 | case PCI_CAP_ID_MSI: | |
105 | { | |
106 | int pos; | |
107 | ||
108 | if (!(pos = pci_find_capability(entry->dev, PCI_CAP_ID_MSI))) | |
109 | return; | |
110 | ||
111 | pci_read_config_dword(entry->dev, msi_lower_address_reg(pos), | |
112 | &address.lo_address.value); | |
113 | address.lo_address.value &= MSI_ADDRESS_DEST_ID_MASK; | |
b4033c17 AR |
114 | address.lo_address.value |= (cpu_physical_id(dest_cpu) << |
115 | MSI_TARGET_CPU_SHIFT); | |
116 | entry->msi_attrib.current_cpu = cpu_physical_id(dest_cpu); | |
1da177e4 LT |
117 | pci_write_config_dword(entry->dev, msi_lower_address_reg(pos), |
118 | address.lo_address.value); | |
54d5d424 | 119 | set_native_irq_info(irq, cpu_mask); |
1da177e4 LT |
120 | break; |
121 | } | |
122 | case PCI_CAP_ID_MSIX: | |
123 | { | |
124 | int offset = entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE + | |
125 | PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET; | |
126 | ||
127 | address.lo_address.value = readl(entry->mask_base + offset); | |
128 | address.lo_address.value &= MSI_ADDRESS_DEST_ID_MASK; | |
b4033c17 AR |
129 | address.lo_address.value |= (cpu_physical_id(dest_cpu) << |
130 | MSI_TARGET_CPU_SHIFT); | |
131 | entry->msi_attrib.current_cpu = cpu_physical_id(dest_cpu); | |
1da177e4 | 132 | writel(address.lo_address.value, entry->mask_base + offset); |
54d5d424 | 133 | set_native_irq_info(irq, cpu_mask); |
1da177e4 LT |
134 | break; |
135 | } | |
136 | default: | |
137 | break; | |
138 | } | |
139 | } | |
1da177e4 LT |
140 | #endif /* CONFIG_SMP */ |
141 | ||
142 | static void mask_MSI_irq(unsigned int vector) | |
143 | { | |
144 | msi_set_mask_bit(vector, 1); | |
145 | } | |
146 | ||
147 | static void unmask_MSI_irq(unsigned int vector) | |
148 | { | |
149 | msi_set_mask_bit(vector, 0); | |
150 | } | |
151 | ||
152 | static unsigned int startup_msi_irq_wo_maskbit(unsigned int vector) | |
153 | { | |
154 | struct msi_desc *entry; | |
155 | unsigned long flags; | |
156 | ||
157 | spin_lock_irqsave(&msi_lock, flags); | |
158 | entry = msi_desc[vector]; | |
159 | if (!entry || !entry->dev) { | |
160 | spin_unlock_irqrestore(&msi_lock, flags); | |
161 | return 0; | |
162 | } | |
163 | entry->msi_attrib.state = 1; /* Mark it active */ | |
164 | spin_unlock_irqrestore(&msi_lock, flags); | |
165 | ||
166 | return 0; /* never anything pending */ | |
167 | } | |
168 | ||
70549ad9 | 169 | static unsigned int startup_msi_irq_w_maskbit(unsigned int vector) |
1da177e4 | 170 | { |
70549ad9 GKH |
171 | startup_msi_irq_wo_maskbit(vector); |
172 | unmask_MSI_irq(vector); | |
173 | return 0; /* never anything pending */ | |
1da177e4 LT |
174 | } |
175 | ||
70549ad9 | 176 | static void shutdown_msi_irq(unsigned int vector) |
1da177e4 LT |
177 | { |
178 | struct msi_desc *entry; | |
179 | unsigned long flags; | |
180 | ||
181 | spin_lock_irqsave(&msi_lock, flags); | |
182 | entry = msi_desc[vector]; | |
70549ad9 GKH |
183 | if (entry && entry->dev) |
184 | entry->msi_attrib.state = 0; /* Mark it not active */ | |
1da177e4 | 185 | spin_unlock_irqrestore(&msi_lock, flags); |
1da177e4 LT |
186 | } |
187 | ||
70549ad9 GKH |
188 | static void end_msi_irq_wo_maskbit(unsigned int vector) |
189 | { | |
54d5d424 | 190 | move_native_irq(vector); |
70549ad9 GKH |
191 | ack_APIC_irq(); |
192 | } | |
1da177e4 LT |
193 | |
194 | static void end_msi_irq_w_maskbit(unsigned int vector) | |
195 | { | |
54d5d424 | 196 | move_native_irq(vector); |
1da177e4 LT |
197 | unmask_MSI_irq(vector); |
198 | ack_APIC_irq(); | |
199 | } | |
200 | ||
70549ad9 GKH |
201 | static void do_nothing(unsigned int vector) |
202 | { | |
203 | } | |
204 | ||
1da177e4 LT |
205 | /* |
206 | * Interrupt Type for MSI-X PCI/PCI-X/PCI-Express Devices, | |
207 | * which implement the MSI-X Capability Structure. | |
208 | */ | |
209 | static struct hw_interrupt_type msix_irq_type = { | |
210 | .typename = "PCI-MSI-X", | |
211 | .startup = startup_msi_irq_w_maskbit, | |
70549ad9 GKH |
212 | .shutdown = shutdown_msi_irq, |
213 | .enable = unmask_MSI_irq, | |
214 | .disable = mask_MSI_irq, | |
215 | .ack = mask_MSI_irq, | |
1da177e4 LT |
216 | .end = end_msi_irq_w_maskbit, |
217 | .set_affinity = set_msi_irq_affinity | |
218 | }; | |
219 | ||
220 | /* | |
221 | * Interrupt Type for MSI PCI/PCI-X/PCI-Express Devices, | |
222 | * which implement the MSI Capability Structure with | |
223 | * Mask-and-Pending Bits. | |
224 | */ | |
225 | static struct hw_interrupt_type msi_irq_w_maskbit_type = { | |
226 | .typename = "PCI-MSI", | |
227 | .startup = startup_msi_irq_w_maskbit, | |
70549ad9 GKH |
228 | .shutdown = shutdown_msi_irq, |
229 | .enable = unmask_MSI_irq, | |
230 | .disable = mask_MSI_irq, | |
231 | .ack = mask_MSI_irq, | |
1da177e4 LT |
232 | .end = end_msi_irq_w_maskbit, |
233 | .set_affinity = set_msi_irq_affinity | |
234 | }; | |
235 | ||
236 | /* | |
237 | * Interrupt Type for MSI PCI/PCI-X/PCI-Express Devices, | |
238 | * which implement the MSI Capability Structure without | |
239 | * Mask-and-Pending Bits. | |
240 | */ | |
241 | static struct hw_interrupt_type msi_irq_wo_maskbit_type = { | |
242 | .typename = "PCI-MSI", | |
243 | .startup = startup_msi_irq_wo_maskbit, | |
70549ad9 GKH |
244 | .shutdown = shutdown_msi_irq, |
245 | .enable = do_nothing, | |
246 | .disable = do_nothing, | |
247 | .ack = do_nothing, | |
1da177e4 LT |
248 | .end = end_msi_irq_wo_maskbit, |
249 | .set_affinity = set_msi_irq_affinity | |
250 | }; | |
251 | ||
252 | static void msi_data_init(struct msg_data *msi_data, | |
253 | unsigned int vector) | |
254 | { | |
255 | memset(msi_data, 0, sizeof(struct msg_data)); | |
256 | msi_data->vector = (u8)vector; | |
257 | msi_data->delivery_mode = MSI_DELIVERY_MODE; | |
258 | msi_data->level = MSI_LEVEL_MODE; | |
259 | msi_data->trigger = MSI_TRIGGER_MODE; | |
260 | } | |
261 | ||
262 | static void msi_address_init(struct msg_address *msi_address) | |
263 | { | |
264 | unsigned int dest_id; | |
b4033c17 | 265 | unsigned long dest_phys_id = cpu_physical_id(MSI_TARGET_CPU); |
1da177e4 LT |
266 | |
267 | memset(msi_address, 0, sizeof(struct msg_address)); | |
268 | msi_address->hi_address = (u32)0; | |
269 | dest_id = (MSI_ADDRESS_HEADER << MSI_ADDRESS_HEADER_SHIFT); | |
b4033c17 | 270 | msi_address->lo_address.u.dest_mode = MSI_PHYSICAL_MODE; |
1da177e4 LT |
271 | msi_address->lo_address.u.redirection_hint = MSI_REDIRECTION_HINT_MODE; |
272 | msi_address->lo_address.u.dest_id = dest_id; | |
b4033c17 | 273 | msi_address->lo_address.value |= (dest_phys_id << MSI_TARGET_CPU_SHIFT); |
1da177e4 LT |
274 | } |
275 | ||
276 | static int msi_free_vector(struct pci_dev* dev, int vector, int reassign); | |
277 | static int assign_msi_vector(void) | |
278 | { | |
279 | static int new_vector_avail = 1; | |
280 | int vector; | |
281 | unsigned long flags; | |
282 | ||
283 | /* | |
284 | * msi_lock is provided to ensure that successful allocation of MSI | |
285 | * vector is assigned unique among drivers. | |
286 | */ | |
287 | spin_lock_irqsave(&msi_lock, flags); | |
288 | ||
289 | if (!new_vector_avail) { | |
290 | int free_vector = 0; | |
291 | ||
292 | /* | |
293 | * vector_irq[] = -1 indicates that this specific vector is: | |
294 | * - assigned for MSI (since MSI have no associated IRQ) or | |
295 | * - assigned for legacy if less than 16, or | |
296 | * - having no corresponding 1:1 vector-to-IOxAPIC IRQ mapping | |
297 | * vector_irq[] = 0 indicates that this vector, previously | |
298 | * assigned for MSI, is freed by hotplug removed operations. | |
299 | * This vector will be reused for any subsequent hotplug added | |
300 | * operations. | |
301 | * vector_irq[] > 0 indicates that this vector is assigned for | |
302 | * IOxAPIC IRQs. This vector and its value provides a 1-to-1 | |
303 | * vector-to-IOxAPIC IRQ mapping. | |
304 | */ | |
305 | for (vector = FIRST_DEVICE_VECTOR; vector < NR_IRQS; vector++) { | |
306 | if (vector_irq[vector] != 0) | |
307 | continue; | |
308 | free_vector = vector; | |
309 | if (!msi_desc[vector]) | |
310 | break; | |
311 | else | |
312 | continue; | |
313 | } | |
314 | if (!free_vector) { | |
315 | spin_unlock_irqrestore(&msi_lock, flags); | |
316 | return -EBUSY; | |
317 | } | |
318 | vector_irq[free_vector] = -1; | |
319 | nr_released_vectors--; | |
320 | spin_unlock_irqrestore(&msi_lock, flags); | |
321 | if (msi_desc[free_vector] != NULL) { | |
322 | struct pci_dev *dev; | |
323 | int tail; | |
324 | ||
325 | /* free all linked vectors before re-assign */ | |
326 | do { | |
327 | spin_lock_irqsave(&msi_lock, flags); | |
328 | dev = msi_desc[free_vector]->dev; | |
329 | tail = msi_desc[free_vector]->link.tail; | |
330 | spin_unlock_irqrestore(&msi_lock, flags); | |
331 | msi_free_vector(dev, tail, 1); | |
332 | } while (free_vector != tail); | |
333 | } | |
334 | ||
335 | return free_vector; | |
336 | } | |
337 | vector = assign_irq_vector(AUTO_ASSIGN); | |
338 | last_alloc_vector = vector; | |
339 | if (vector == LAST_DEVICE_VECTOR) | |
340 | new_vector_avail = 0; | |
341 | ||
342 | spin_unlock_irqrestore(&msi_lock, flags); | |
343 | return vector; | |
344 | } | |
345 | ||
346 | static int get_new_vector(void) | |
347 | { | |
348 | int vector; | |
349 | ||
350 | if ((vector = assign_msi_vector()) > 0) | |
351 | set_intr_gate(vector, interrupt[vector]); | |
352 | ||
353 | return vector; | |
354 | } | |
355 | ||
356 | static int msi_init(void) | |
357 | { | |
358 | static int status = -ENOMEM; | |
359 | ||
360 | if (!status) | |
361 | return status; | |
362 | ||
363 | if (pci_msi_quirk) { | |
364 | pci_msi_enable = 0; | |
365 | printk(KERN_WARNING "PCI: MSI quirk detected. MSI disabled.\n"); | |
366 | status = -EINVAL; | |
367 | return status; | |
368 | } | |
369 | ||
370 | if ((status = msi_cache_init()) < 0) { | |
371 | pci_msi_enable = 0; | |
372 | printk(KERN_WARNING "PCI: MSI cache init failed\n"); | |
373 | return status; | |
374 | } | |
375 | last_alloc_vector = assign_irq_vector(AUTO_ASSIGN); | |
376 | if (last_alloc_vector < 0) { | |
377 | pci_msi_enable = 0; | |
378 | printk(KERN_WARNING "PCI: No interrupt vectors available for MSI\n"); | |
379 | status = -EBUSY; | |
380 | return status; | |
381 | } | |
382 | vector_irq[last_alloc_vector] = 0; | |
383 | nr_released_vectors++; | |
384 | ||
385 | return status; | |
386 | } | |
387 | ||
388 | static int get_msi_vector(struct pci_dev *dev) | |
389 | { | |
390 | return get_new_vector(); | |
391 | } | |
392 | ||
393 | static struct msi_desc* alloc_msi_entry(void) | |
394 | { | |
395 | struct msi_desc *entry; | |
396 | ||
70549ad9 | 397 | entry = kmem_cache_alloc(msi_cachep, SLAB_KERNEL); |
1da177e4 LT |
398 | if (!entry) |
399 | return NULL; | |
400 | ||
401 | memset(entry, 0, sizeof(struct msi_desc)); | |
402 | entry->link.tail = entry->link.head = 0; /* single message */ | |
403 | entry->dev = NULL; | |
404 | ||
405 | return entry; | |
406 | } | |
407 | ||
408 | static void attach_msi_entry(struct msi_desc *entry, int vector) | |
409 | { | |
410 | unsigned long flags; | |
411 | ||
412 | spin_lock_irqsave(&msi_lock, flags); | |
413 | msi_desc[vector] = entry; | |
414 | spin_unlock_irqrestore(&msi_lock, flags); | |
415 | } | |
416 | ||
417 | static void irq_handler_init(int cap_id, int pos, int mask) | |
418 | { | |
419 | spin_lock(&irq_desc[pos].lock); | |
420 | if (cap_id == PCI_CAP_ID_MSIX) | |
421 | irq_desc[pos].handler = &msix_irq_type; | |
422 | else { | |
423 | if (!mask) | |
424 | irq_desc[pos].handler = &msi_irq_wo_maskbit_type; | |
425 | else | |
426 | irq_desc[pos].handler = &msi_irq_w_maskbit_type; | |
427 | } | |
428 | spin_unlock(&irq_desc[pos].lock); | |
429 | } | |
430 | ||
431 | static void enable_msi_mode(struct pci_dev *dev, int pos, int type) | |
432 | { | |
433 | u16 control; | |
434 | ||
435 | pci_read_config_word(dev, msi_control_reg(pos), &control); | |
436 | if (type == PCI_CAP_ID_MSI) { | |
437 | /* Set enabled bits to single MSI & enable MSI_enable bit */ | |
438 | msi_enable(control, 1); | |
439 | pci_write_config_word(dev, msi_control_reg(pos), control); | |
440 | } else { | |
441 | msix_enable(control); | |
442 | pci_write_config_word(dev, msi_control_reg(pos), control); | |
443 | } | |
444 | if (pci_find_capability(dev, PCI_CAP_ID_EXP)) { | |
445 | /* PCI Express Endpoint device detected */ | |
a04ce0ff | 446 | pci_intx(dev, 0); /* disable intx */ |
1da177e4 LT |
447 | } |
448 | } | |
449 | ||
4602b88d | 450 | void disable_msi_mode(struct pci_dev *dev, int pos, int type) |
1da177e4 LT |
451 | { |
452 | u16 control; | |
453 | ||
454 | pci_read_config_word(dev, msi_control_reg(pos), &control); | |
455 | if (type == PCI_CAP_ID_MSI) { | |
456 | /* Set enabled bits to single MSI & enable MSI_enable bit */ | |
457 | msi_disable(control); | |
458 | pci_write_config_word(dev, msi_control_reg(pos), control); | |
459 | } else { | |
460 | msix_disable(control); | |
461 | pci_write_config_word(dev, msi_control_reg(pos), control); | |
462 | } | |
463 | if (pci_find_capability(dev, PCI_CAP_ID_EXP)) { | |
464 | /* PCI Express Endpoint device detected */ | |
a04ce0ff | 465 | pci_intx(dev, 1); /* enable intx */ |
1da177e4 LT |
466 | } |
467 | } | |
468 | ||
469 | static int msi_lookup_vector(struct pci_dev *dev, int type) | |
470 | { | |
471 | int vector; | |
472 | unsigned long flags; | |
473 | ||
474 | spin_lock_irqsave(&msi_lock, flags); | |
475 | for (vector = FIRST_DEVICE_VECTOR; vector < NR_IRQS; vector++) { | |
476 | if (!msi_desc[vector] || msi_desc[vector]->dev != dev || | |
477 | msi_desc[vector]->msi_attrib.type != type || | |
478 | msi_desc[vector]->msi_attrib.default_vector != dev->irq) | |
479 | continue; | |
480 | spin_unlock_irqrestore(&msi_lock, flags); | |
481 | /* This pre-assigned MSI vector for this device | |
482 | already exits. Override dev->irq with this vector */ | |
483 | dev->irq = vector; | |
484 | return 0; | |
485 | } | |
486 | spin_unlock_irqrestore(&msi_lock, flags); | |
487 | ||
488 | return -EACCES; | |
489 | } | |
490 | ||
491 | void pci_scan_msi_device(struct pci_dev *dev) | |
492 | { | |
493 | if (!dev) | |
494 | return; | |
495 | ||
496 | if (pci_find_capability(dev, PCI_CAP_ID_MSIX) > 0) | |
497 | nr_msix_devices++; | |
498 | else if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0) | |
499 | nr_reserved_vectors++; | |
500 | } | |
501 | ||
502 | /** | |
503 | * msi_capability_init - configure device's MSI capability structure | |
504 | * @dev: pointer to the pci_dev data structure of MSI device function | |
505 | * | |
eaae4b3a | 506 | * Setup the MSI capability structure of device function with a single |
1da177e4 LT |
507 | * MSI vector, regardless of device function is capable of handling |
508 | * multiple messages. A return of zero indicates the successful setup | |
509 | * of an entry zero with the new MSI vector or non-zero for otherwise. | |
510 | **/ | |
511 | static int msi_capability_init(struct pci_dev *dev) | |
512 | { | |
513 | struct msi_desc *entry; | |
514 | struct msg_address address; | |
515 | struct msg_data data; | |
516 | int pos, vector; | |
517 | u16 control; | |
518 | ||
519 | pos = pci_find_capability(dev, PCI_CAP_ID_MSI); | |
520 | pci_read_config_word(dev, msi_control_reg(pos), &control); | |
521 | /* MSI Entry Initialization */ | |
522 | if (!(entry = alloc_msi_entry())) | |
523 | return -ENOMEM; | |
524 | ||
525 | if ((vector = get_msi_vector(dev)) < 0) { | |
526 | kmem_cache_free(msi_cachep, entry); | |
527 | return -EBUSY; | |
528 | } | |
529 | entry->link.head = vector; | |
530 | entry->link.tail = vector; | |
531 | entry->msi_attrib.type = PCI_CAP_ID_MSI; | |
532 | entry->msi_attrib.state = 0; /* Mark it not active */ | |
533 | entry->msi_attrib.entry_nr = 0; | |
534 | entry->msi_attrib.maskbit = is_mask_bit_support(control); | |
535 | entry->msi_attrib.default_vector = dev->irq; /* Save IOAPIC IRQ */ | |
536 | dev->irq = vector; | |
537 | entry->dev = dev; | |
538 | if (is_mask_bit_support(control)) { | |
539 | entry->mask_base = (void __iomem *)(long)msi_mask_bits_reg(pos, | |
540 | is_64bit_address(control)); | |
541 | } | |
542 | /* Replace with MSI handler */ | |
543 | irq_handler_init(PCI_CAP_ID_MSI, vector, entry->msi_attrib.maskbit); | |
544 | /* Configure MSI capability structure */ | |
545 | msi_address_init(&address); | |
546 | msi_data_init(&data, vector); | |
547 | entry->msi_attrib.current_cpu = ((address.lo_address.u.dest_id >> | |
548 | MSI_TARGET_CPU_SHIFT) & MSI_TARGET_CPU_MASK); | |
549 | pci_write_config_dword(dev, msi_lower_address_reg(pos), | |
550 | address.lo_address.value); | |
551 | if (is_64bit_address(control)) { | |
552 | pci_write_config_dword(dev, | |
553 | msi_upper_address_reg(pos), address.hi_address); | |
554 | pci_write_config_word(dev, | |
555 | msi_data_reg(pos, 1), *((u32*)&data)); | |
556 | } else | |
557 | pci_write_config_word(dev, | |
558 | msi_data_reg(pos, 0), *((u32*)&data)); | |
559 | if (entry->msi_attrib.maskbit) { | |
560 | unsigned int maskbits, temp; | |
561 | /* All MSIs are unmasked by default, Mask them all */ | |
562 | pci_read_config_dword(dev, | |
563 | msi_mask_bits_reg(pos, is_64bit_address(control)), | |
564 | &maskbits); | |
565 | temp = (1 << multi_msi_capable(control)); | |
566 | temp = ((temp - 1) & ~temp); | |
567 | maskbits |= temp; | |
568 | pci_write_config_dword(dev, | |
569 | msi_mask_bits_reg(pos, is_64bit_address(control)), | |
570 | maskbits); | |
571 | } | |
572 | attach_msi_entry(entry, vector); | |
573 | /* Set MSI enabled bits */ | |
574 | enable_msi_mode(dev, pos, PCI_CAP_ID_MSI); | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | /** | |
580 | * msix_capability_init - configure device's MSI-X capability | |
581 | * @dev: pointer to the pci_dev data structure of MSI-X device function | |
8f7020d3 RD |
582 | * @entries: pointer to an array of struct msix_entry entries |
583 | * @nvec: number of @entries | |
1da177e4 | 584 | * |
eaae4b3a | 585 | * Setup the MSI-X capability structure of device function with a |
1da177e4 LT |
586 | * single MSI-X vector. A return of zero indicates the successful setup of |
587 | * requested MSI-X entries with allocated vectors or non-zero for otherwise. | |
588 | **/ | |
589 | static int msix_capability_init(struct pci_dev *dev, | |
590 | struct msix_entry *entries, int nvec) | |
591 | { | |
592 | struct msi_desc *head = NULL, *tail = NULL, *entry = NULL; | |
593 | struct msg_address address; | |
594 | struct msg_data data; | |
595 | int vector, pos, i, j, nr_entries, temp = 0; | |
596 | u32 phys_addr, table_offset; | |
597 | u16 control; | |
598 | u8 bir; | |
599 | void __iomem *base; | |
600 | ||
601 | pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); | |
602 | /* Request & Map MSI-X table region */ | |
603 | pci_read_config_word(dev, msi_control_reg(pos), &control); | |
604 | nr_entries = multi_msix_capable(control); | |
605 | pci_read_config_dword(dev, msix_table_offset_reg(pos), | |
606 | &table_offset); | |
607 | bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK); | |
608 | phys_addr = pci_resource_start (dev, bir); | |
609 | phys_addr += (u32)(table_offset & ~PCI_MSIX_FLAGS_BIRMASK); | |
610 | base = ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE); | |
611 | if (base == NULL) | |
612 | return -ENOMEM; | |
613 | ||
614 | /* MSI-X Table Initialization */ | |
615 | for (i = 0; i < nvec; i++) { | |
616 | entry = alloc_msi_entry(); | |
617 | if (!entry) | |
618 | break; | |
619 | if ((vector = get_msi_vector(dev)) < 0) | |
620 | break; | |
621 | ||
622 | j = entries[i].entry; | |
623 | entries[i].vector = vector; | |
624 | entry->msi_attrib.type = PCI_CAP_ID_MSIX; | |
625 | entry->msi_attrib.state = 0; /* Mark it not active */ | |
626 | entry->msi_attrib.entry_nr = j; | |
627 | entry->msi_attrib.maskbit = 1; | |
628 | entry->msi_attrib.default_vector = dev->irq; | |
629 | entry->dev = dev; | |
630 | entry->mask_base = base; | |
631 | if (!head) { | |
632 | entry->link.head = vector; | |
633 | entry->link.tail = vector; | |
634 | head = entry; | |
635 | } else { | |
636 | entry->link.head = temp; | |
637 | entry->link.tail = tail->link.tail; | |
638 | tail->link.tail = vector; | |
639 | head->link.head = vector; | |
640 | } | |
641 | temp = vector; | |
642 | tail = entry; | |
643 | /* Replace with MSI-X handler */ | |
644 | irq_handler_init(PCI_CAP_ID_MSIX, vector, 1); | |
645 | /* Configure MSI-X capability structure */ | |
646 | msi_address_init(&address); | |
647 | msi_data_init(&data, vector); | |
648 | entry->msi_attrib.current_cpu = | |
649 | ((address.lo_address.u.dest_id >> | |
650 | MSI_TARGET_CPU_SHIFT) & MSI_TARGET_CPU_MASK); | |
651 | writel(address.lo_address.value, | |
652 | base + j * PCI_MSIX_ENTRY_SIZE + | |
653 | PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET); | |
654 | writel(address.hi_address, | |
655 | base + j * PCI_MSIX_ENTRY_SIZE + | |
656 | PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET); | |
657 | writel(*(u32*)&data, | |
658 | base + j * PCI_MSIX_ENTRY_SIZE + | |
659 | PCI_MSIX_ENTRY_DATA_OFFSET); | |
660 | attach_msi_entry(entry, vector); | |
661 | } | |
662 | if (i != nvec) { | |
663 | i--; | |
664 | for (; i >= 0; i--) { | |
665 | vector = (entries + i)->vector; | |
666 | msi_free_vector(dev, vector, 0); | |
667 | (entries + i)->vector = 0; | |
668 | } | |
669 | return -EBUSY; | |
670 | } | |
671 | /* Set MSI-X enabled bits */ | |
672 | enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX); | |
673 | ||
674 | return 0; | |
675 | } | |
676 | ||
677 | /** | |
678 | * pci_enable_msi - configure device's MSI capability structure | |
679 | * @dev: pointer to the pci_dev data structure of MSI device function | |
680 | * | |
681 | * Setup the MSI capability structure of device function with | |
682 | * a single MSI vector upon its software driver call to request for | |
683 | * MSI mode enabled on its hardware device function. A return of zero | |
684 | * indicates the successful setup of an entry zero with the new MSI | |
685 | * vector or non-zero for otherwise. | |
686 | **/ | |
687 | int pci_enable_msi(struct pci_dev* dev) | |
688 | { | |
689 | int pos, temp, status = -EINVAL; | |
690 | u16 control; | |
691 | ||
692 | if (!pci_msi_enable || !dev) | |
693 | return status; | |
694 | ||
4602b88d KA |
695 | if (dev->no_msi) |
696 | return status; | |
697 | ||
1da177e4 LT |
698 | temp = dev->irq; |
699 | ||
700 | if ((status = msi_init()) < 0) | |
701 | return status; | |
702 | ||
703 | if (!(pos = pci_find_capability(dev, PCI_CAP_ID_MSI))) | |
704 | return -EINVAL; | |
705 | ||
706 | pci_read_config_word(dev, msi_control_reg(pos), &control); | |
707 | if (control & PCI_MSI_FLAGS_ENABLE) | |
708 | return 0; /* Already in MSI mode */ | |
709 | ||
710 | if (!msi_lookup_vector(dev, PCI_CAP_ID_MSI)) { | |
711 | /* Lookup Sucess */ | |
712 | unsigned long flags; | |
713 | ||
714 | spin_lock_irqsave(&msi_lock, flags); | |
715 | if (!vector_irq[dev->irq]) { | |
716 | msi_desc[dev->irq]->msi_attrib.state = 0; | |
717 | vector_irq[dev->irq] = -1; | |
718 | nr_released_vectors--; | |
719 | spin_unlock_irqrestore(&msi_lock, flags); | |
720 | enable_msi_mode(dev, pos, PCI_CAP_ID_MSI); | |
721 | return 0; | |
722 | } | |
723 | spin_unlock_irqrestore(&msi_lock, flags); | |
724 | dev->irq = temp; | |
725 | } | |
726 | /* Check whether driver already requested for MSI-X vectors */ | |
727 | if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSIX)) > 0 && | |
728 | !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { | |
729 | printk(KERN_INFO "PCI: %s: Can't enable MSI. " | |
730 | "Device already has MSI-X vectors assigned\n", | |
731 | pci_name(dev)); | |
732 | dev->irq = temp; | |
733 | return -EINVAL; | |
734 | } | |
735 | status = msi_capability_init(dev); | |
736 | if (!status) { | |
737 | if (!pos) | |
738 | nr_reserved_vectors--; /* Only MSI capable */ | |
739 | else if (nr_msix_devices > 0) | |
740 | nr_msix_devices--; /* Both MSI and MSI-X capable, | |
741 | but choose enabling MSI */ | |
742 | } | |
743 | ||
744 | return status; | |
745 | } | |
746 | ||
747 | void pci_disable_msi(struct pci_dev* dev) | |
748 | { | |
749 | struct msi_desc *entry; | |
750 | int pos, default_vector; | |
751 | u16 control; | |
752 | unsigned long flags; | |
753 | ||
754 | if (!dev || !(pos = pci_find_capability(dev, PCI_CAP_ID_MSI))) | |
755 | return; | |
756 | ||
757 | pci_read_config_word(dev, msi_control_reg(pos), &control); | |
758 | if (!(control & PCI_MSI_FLAGS_ENABLE)) | |
759 | return; | |
760 | ||
761 | spin_lock_irqsave(&msi_lock, flags); | |
762 | entry = msi_desc[dev->irq]; | |
763 | if (!entry || !entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI) { | |
764 | spin_unlock_irqrestore(&msi_lock, flags); | |
765 | return; | |
766 | } | |
767 | if (entry->msi_attrib.state) { | |
768 | spin_unlock_irqrestore(&msi_lock, flags); | |
769 | printk(KERN_WARNING "PCI: %s: pci_disable_msi() called without " | |
770 | "free_irq() on MSI vector %d\n", | |
771 | pci_name(dev), dev->irq); | |
772 | BUG_ON(entry->msi_attrib.state > 0); | |
773 | } else { | |
774 | vector_irq[dev->irq] = 0; /* free it */ | |
775 | nr_released_vectors++; | |
776 | default_vector = entry->msi_attrib.default_vector; | |
777 | spin_unlock_irqrestore(&msi_lock, flags); | |
778 | /* Restore dev->irq to its default pin-assertion vector */ | |
779 | dev->irq = default_vector; | |
780 | disable_msi_mode(dev, pci_find_capability(dev, PCI_CAP_ID_MSI), | |
781 | PCI_CAP_ID_MSI); | |
782 | } | |
783 | } | |
784 | ||
1da177e4 LT |
785 | static int msi_free_vector(struct pci_dev* dev, int vector, int reassign) |
786 | { | |
787 | struct msi_desc *entry; | |
788 | int head, entry_nr, type; | |
789 | void __iomem *base; | |
790 | unsigned long flags; | |
791 | ||
792 | spin_lock_irqsave(&msi_lock, flags); | |
793 | entry = msi_desc[vector]; | |
794 | if (!entry || entry->dev != dev) { | |
795 | spin_unlock_irqrestore(&msi_lock, flags); | |
796 | return -EINVAL; | |
797 | } | |
798 | type = entry->msi_attrib.type; | |
799 | entry_nr = entry->msi_attrib.entry_nr; | |
800 | head = entry->link.head; | |
801 | base = entry->mask_base; | |
802 | msi_desc[entry->link.head]->link.tail = entry->link.tail; | |
803 | msi_desc[entry->link.tail]->link.head = entry->link.head; | |
804 | entry->dev = NULL; | |
805 | if (!reassign) { | |
806 | vector_irq[vector] = 0; | |
807 | nr_released_vectors++; | |
808 | } | |
809 | msi_desc[vector] = NULL; | |
810 | spin_unlock_irqrestore(&msi_lock, flags); | |
811 | ||
812 | kmem_cache_free(msi_cachep, entry); | |
813 | ||
814 | if (type == PCI_CAP_ID_MSIX) { | |
815 | if (!reassign) | |
816 | writel(1, base + | |
817 | entry_nr * PCI_MSIX_ENTRY_SIZE + | |
818 | PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET); | |
819 | ||
820 | if (head == vector) { | |
821 | /* | |
822 | * Detect last MSI-X vector to be released. | |
823 | * Release the MSI-X memory-mapped table. | |
824 | */ | |
825 | int pos, nr_entries; | |
826 | u32 phys_addr, table_offset; | |
827 | u16 control; | |
828 | u8 bir; | |
829 | ||
830 | pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); | |
831 | pci_read_config_word(dev, msi_control_reg(pos), | |
832 | &control); | |
833 | nr_entries = multi_msix_capable(control); | |
834 | pci_read_config_dword(dev, msix_table_offset_reg(pos), | |
835 | &table_offset); | |
836 | bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK); | |
837 | phys_addr = pci_resource_start (dev, bir); | |
838 | phys_addr += (u32)(table_offset & | |
839 | ~PCI_MSIX_FLAGS_BIRMASK); | |
840 | iounmap(base); | |
841 | } | |
842 | } | |
843 | ||
844 | return 0; | |
845 | } | |
846 | ||
847 | static int reroute_msix_table(int head, struct msix_entry *entries, int *nvec) | |
848 | { | |
849 | int vector = head, tail = 0; | |
850 | int i, j = 0, nr_entries = 0; | |
851 | void __iomem *base; | |
852 | unsigned long flags; | |
853 | ||
854 | spin_lock_irqsave(&msi_lock, flags); | |
855 | while (head != tail) { | |
856 | nr_entries++; | |
857 | tail = msi_desc[vector]->link.tail; | |
858 | if (entries[0].entry == msi_desc[vector]->msi_attrib.entry_nr) | |
859 | j = vector; | |
860 | vector = tail; | |
861 | } | |
862 | if (*nvec > nr_entries) { | |
863 | spin_unlock_irqrestore(&msi_lock, flags); | |
864 | *nvec = nr_entries; | |
865 | return -EINVAL; | |
866 | } | |
867 | vector = ((j > 0) ? j : head); | |
868 | for (i = 0; i < *nvec; i++) { | |
869 | j = msi_desc[vector]->msi_attrib.entry_nr; | |
870 | msi_desc[vector]->msi_attrib.state = 0; /* Mark it not active */ | |
871 | vector_irq[vector] = -1; /* Mark it busy */ | |
872 | nr_released_vectors--; | |
873 | entries[i].vector = vector; | |
874 | if (j != (entries + i)->entry) { | |
875 | base = msi_desc[vector]->mask_base; | |
876 | msi_desc[vector]->msi_attrib.entry_nr = | |
877 | (entries + i)->entry; | |
878 | writel( readl(base + j * PCI_MSIX_ENTRY_SIZE + | |
879 | PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET), base + | |
880 | (entries + i)->entry * PCI_MSIX_ENTRY_SIZE + | |
881 | PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET); | |
882 | writel( readl(base + j * PCI_MSIX_ENTRY_SIZE + | |
883 | PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET), base + | |
884 | (entries + i)->entry * PCI_MSIX_ENTRY_SIZE + | |
885 | PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET); | |
886 | writel( (readl(base + j * PCI_MSIX_ENTRY_SIZE + | |
887 | PCI_MSIX_ENTRY_DATA_OFFSET) & 0xff00) | vector, | |
888 | base + (entries+i)->entry*PCI_MSIX_ENTRY_SIZE + | |
889 | PCI_MSIX_ENTRY_DATA_OFFSET); | |
890 | } | |
891 | vector = msi_desc[vector]->link.tail; | |
892 | } | |
893 | spin_unlock_irqrestore(&msi_lock, flags); | |
894 | ||
895 | return 0; | |
896 | } | |
897 | ||
898 | /** | |
899 | * pci_enable_msix - configure device's MSI-X capability structure | |
900 | * @dev: pointer to the pci_dev data structure of MSI-X device function | |
70549ad9 | 901 | * @entries: pointer to an array of MSI-X entries |
1da177e4 LT |
902 | * @nvec: number of MSI-X vectors requested for allocation by device driver |
903 | * | |
904 | * Setup the MSI-X capability structure of device function with the number | |
905 | * of requested vectors upon its software driver call to request for | |
906 | * MSI-X mode enabled on its hardware device function. A return of zero | |
907 | * indicates the successful configuration of MSI-X capability structure | |
908 | * with new allocated MSI-X vectors. A return of < 0 indicates a failure. | |
909 | * Or a return of > 0 indicates that driver request is exceeding the number | |
910 | * of vectors available. Driver should use the returned value to re-send | |
911 | * its request. | |
912 | **/ | |
913 | int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) | |
914 | { | |
915 | int status, pos, nr_entries, free_vectors; | |
916 | int i, j, temp; | |
917 | u16 control; | |
918 | unsigned long flags; | |
919 | ||
920 | if (!pci_msi_enable || !dev || !entries) | |
921 | return -EINVAL; | |
922 | ||
923 | if ((status = msi_init()) < 0) | |
924 | return status; | |
925 | ||
926 | if (!(pos = pci_find_capability(dev, PCI_CAP_ID_MSIX))) | |
927 | return -EINVAL; | |
928 | ||
929 | pci_read_config_word(dev, msi_control_reg(pos), &control); | |
930 | if (control & PCI_MSIX_FLAGS_ENABLE) | |
931 | return -EINVAL; /* Already in MSI-X mode */ | |
932 | ||
933 | nr_entries = multi_msix_capable(control); | |
934 | if (nvec > nr_entries) | |
935 | return -EINVAL; | |
936 | ||
937 | /* Check for any invalid entries */ | |
938 | for (i = 0; i < nvec; i++) { | |
939 | if (entries[i].entry >= nr_entries) | |
940 | return -EINVAL; /* invalid entry */ | |
941 | for (j = i + 1; j < nvec; j++) { | |
942 | if (entries[i].entry == entries[j].entry) | |
943 | return -EINVAL; /* duplicate entry */ | |
944 | } | |
945 | } | |
946 | temp = dev->irq; | |
947 | if (!msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { | |
948 | /* Lookup Sucess */ | |
949 | nr_entries = nvec; | |
950 | /* Reroute MSI-X table */ | |
951 | if (reroute_msix_table(dev->irq, entries, &nr_entries)) { | |
952 | /* #requested > #previous-assigned */ | |
953 | dev->irq = temp; | |
954 | return nr_entries; | |
955 | } | |
956 | dev->irq = temp; | |
957 | enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX); | |
958 | return 0; | |
959 | } | |
960 | /* Check whether driver already requested for MSI vector */ | |
961 | if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0 && | |
962 | !msi_lookup_vector(dev, PCI_CAP_ID_MSI)) { | |
963 | printk(KERN_INFO "PCI: %s: Can't enable MSI-X. " | |
964 | "Device already has an MSI vector assigned\n", | |
965 | pci_name(dev)); | |
966 | dev->irq = temp; | |
967 | return -EINVAL; | |
968 | } | |
969 | ||
970 | spin_lock_irqsave(&msi_lock, flags); | |
971 | /* | |
972 | * msi_lock is provided to ensure that enough vectors resources are | |
973 | * available before granting. | |
974 | */ | |
975 | free_vectors = pci_vector_resources(last_alloc_vector, | |
976 | nr_released_vectors); | |
977 | /* Ensure that each MSI/MSI-X device has one vector reserved by | |
978 | default to avoid any MSI-X driver to take all available | |
979 | resources */ | |
980 | free_vectors -= nr_reserved_vectors; | |
981 | /* Find the average of free vectors among MSI-X devices */ | |
982 | if (nr_msix_devices > 0) | |
983 | free_vectors /= nr_msix_devices; | |
984 | spin_unlock_irqrestore(&msi_lock, flags); | |
985 | ||
986 | if (nvec > free_vectors) { | |
987 | if (free_vectors > 0) | |
988 | return free_vectors; | |
989 | else | |
990 | return -EBUSY; | |
991 | } | |
992 | ||
993 | status = msix_capability_init(dev, entries, nvec); | |
994 | if (!status && nr_msix_devices > 0) | |
995 | nr_msix_devices--; | |
996 | ||
997 | return status; | |
998 | } | |
999 | ||
1000 | void pci_disable_msix(struct pci_dev* dev) | |
1001 | { | |
1002 | int pos, temp; | |
1003 | u16 control; | |
1004 | ||
1005 | if (!dev || !(pos = pci_find_capability(dev, PCI_CAP_ID_MSIX))) | |
1006 | return; | |
1007 | ||
1008 | pci_read_config_word(dev, msi_control_reg(pos), &control); | |
1009 | if (!(control & PCI_MSIX_FLAGS_ENABLE)) | |
1010 | return; | |
1011 | ||
1012 | temp = dev->irq; | |
1013 | if (!msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { | |
1014 | int state, vector, head, tail = 0, warning = 0; | |
1015 | unsigned long flags; | |
1016 | ||
1017 | vector = head = dev->irq; | |
1018 | spin_lock_irqsave(&msi_lock, flags); | |
1019 | while (head != tail) { | |
1020 | state = msi_desc[vector]->msi_attrib.state; | |
1021 | if (state) | |
1022 | warning = 1; | |
1023 | else { | |
1024 | vector_irq[vector] = 0; /* free it */ | |
1025 | nr_released_vectors++; | |
1026 | } | |
1027 | tail = msi_desc[vector]->link.tail; | |
1028 | vector = tail; | |
1029 | } | |
1030 | spin_unlock_irqrestore(&msi_lock, flags); | |
1031 | if (warning) { | |
1032 | dev->irq = temp; | |
1033 | printk(KERN_WARNING "PCI: %s: pci_disable_msix() called without " | |
1034 | "free_irq() on all MSI-X vectors\n", | |
1035 | pci_name(dev)); | |
1036 | BUG_ON(warning > 0); | |
1037 | } else { | |
1038 | dev->irq = temp; | |
1039 | disable_msi_mode(dev, | |
1040 | pci_find_capability(dev, PCI_CAP_ID_MSIX), | |
1041 | PCI_CAP_ID_MSIX); | |
1042 | ||
1043 | } | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | /** | |
1048 | * msi_remove_pci_irq_vectors - reclaim MSI(X) vectors to unused state | |
1049 | * @dev: pointer to the pci_dev data structure of MSI(X) device function | |
1050 | * | |
eaae4b3a | 1051 | * Being called during hotplug remove, from which the device function |
1da177e4 LT |
1052 | * is hot-removed. All previous assigned MSI/MSI-X vectors, if |
1053 | * allocated for this device function, are reclaimed to unused state, | |
1054 | * which may be used later on. | |
1055 | **/ | |
1056 | void msi_remove_pci_irq_vectors(struct pci_dev* dev) | |
1057 | { | |
1058 | int state, pos, temp; | |
1059 | unsigned long flags; | |
1060 | ||
1061 | if (!pci_msi_enable || !dev) | |
1062 | return; | |
1063 | ||
1064 | temp = dev->irq; /* Save IOAPIC IRQ */ | |
1065 | if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) > 0 && | |
1066 | !msi_lookup_vector(dev, PCI_CAP_ID_MSI)) { | |
1067 | spin_lock_irqsave(&msi_lock, flags); | |
1068 | state = msi_desc[dev->irq]->msi_attrib.state; | |
1069 | spin_unlock_irqrestore(&msi_lock, flags); | |
1070 | if (state) { | |
1071 | printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() " | |
1072 | "called without free_irq() on MSI vector %d\n", | |
1073 | pci_name(dev), dev->irq); | |
1074 | BUG_ON(state > 0); | |
1075 | } else /* Release MSI vector assigned to this device */ | |
1076 | msi_free_vector(dev, dev->irq, 0); | |
1077 | dev->irq = temp; /* Restore IOAPIC IRQ */ | |
1078 | } | |
1079 | if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSIX)) > 0 && | |
1080 | !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { | |
1081 | int vector, head, tail = 0, warning = 0; | |
1082 | void __iomem *base = NULL; | |
1083 | ||
1084 | vector = head = dev->irq; | |
1085 | while (head != tail) { | |
1086 | spin_lock_irqsave(&msi_lock, flags); | |
1087 | state = msi_desc[vector]->msi_attrib.state; | |
1088 | tail = msi_desc[vector]->link.tail; | |
1089 | base = msi_desc[vector]->mask_base; | |
1090 | spin_unlock_irqrestore(&msi_lock, flags); | |
1091 | if (state) | |
1092 | warning = 1; | |
1093 | else if (vector != head) /* Release MSI-X vector */ | |
1094 | msi_free_vector(dev, vector, 0); | |
1095 | vector = tail; | |
1096 | } | |
1097 | msi_free_vector(dev, vector, 0); | |
1098 | if (warning) { | |
1099 | /* Force to release the MSI-X memory-mapped table */ | |
1100 | u32 phys_addr, table_offset; | |
1101 | u16 control; | |
1102 | u8 bir; | |
1103 | ||
1104 | pci_read_config_word(dev, msi_control_reg(pos), | |
1105 | &control); | |
1106 | pci_read_config_dword(dev, msix_table_offset_reg(pos), | |
1107 | &table_offset); | |
1108 | bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK); | |
1109 | phys_addr = pci_resource_start (dev, bir); | |
1110 | phys_addr += (u32)(table_offset & | |
1111 | ~PCI_MSIX_FLAGS_BIRMASK); | |
1112 | iounmap(base); | |
1113 | printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() " | |
1114 | "called without free_irq() on all MSI-X vectors\n", | |
1115 | pci_name(dev)); | |
1116 | BUG_ON(warning > 0); | |
1117 | } | |
1118 | dev->irq = temp; /* Restore IOAPIC IRQ */ | |
1119 | } | |
1120 | } | |
1121 | ||
1122 | EXPORT_SYMBOL(pci_enable_msi); | |
1123 | EXPORT_SYMBOL(pci_disable_msi); | |
1124 | EXPORT_SYMBOL(pci_enable_msix); | |
1125 | EXPORT_SYMBOL(pci_disable_msix); |