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Merge remote-tracking branch 'selinux/next'
[deliverable/linux.git] / arch / s390 / pci / pci.c
1 /*
2 * Copyright IBM Corp. 2012
3 *
4 * Author(s):
5 * Jan Glauber <jang@linux.vnet.ibm.com>
6 *
7 * The System z PCI code is a rewrite from a prototype by
8 * the following people (Kudoz!):
9 * Alexander Schmidt
10 * Christoph Raisch
11 * Hannes Hering
12 * Hoang-Nam Nguyen
13 * Jan-Bernd Themann
14 * Stefan Roscher
15 * Thomas Klein
16 */
17
18 #define KMSG_COMPONENT "zpci"
19 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
20
21 #include <linux/kernel.h>
22 #include <linux/slab.h>
23 #include <linux/err.h>
24 #include <linux/export.h>
25 #include <linux/delay.h>
26 #include <linux/irq.h>
27 #include <linux/kernel_stat.h>
28 #include <linux/seq_file.h>
29 #include <linux/pci.h>
30 #include <linux/msi.h>
31
32 #include <asm/isc.h>
33 #include <asm/airq.h>
34 #include <asm/facility.h>
35 #include <asm/pci_insn.h>
36 #include <asm/pci_clp.h>
37 #include <asm/pci_dma.h>
38
39 #define DEBUG /* enable pr_debug */
40
41 #define SIC_IRQ_MODE_ALL 0
42 #define SIC_IRQ_MODE_SINGLE 1
43
44 #define ZPCI_NR_DMA_SPACES 1
45 #define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
46
47 /* list of all detected zpci devices */
48 static LIST_HEAD(zpci_list);
49 static DEFINE_SPINLOCK(zpci_list_lock);
50
51 static struct irq_chip zpci_irq_chip = {
52 .name = "zPCI",
53 .irq_unmask = pci_msi_unmask_irq,
54 .irq_mask = pci_msi_mask_irq,
55 };
56
57 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
58 static DEFINE_SPINLOCK(zpci_domain_lock);
59
60 static struct airq_iv *zpci_aisb_iv;
61 static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];
62
63 /* Adapter interrupt definitions */
64 static void zpci_irq_handler(struct airq_struct *airq);
65
66 static struct airq_struct zpci_airq = {
67 .handler = zpci_irq_handler,
68 .isc = PCI_ISC,
69 };
70
71 #define ZPCI_IOMAP_ENTRIES \
72 min(((unsigned long) CONFIG_PCI_NR_FUNCTIONS * PCI_BAR_COUNT), \
73 ZPCI_IOMAP_MAX_ENTRIES)
74
75 static DEFINE_SPINLOCK(zpci_iomap_lock);
76 static unsigned long *zpci_iomap_bitmap;
77 struct zpci_iomap_entry *zpci_iomap_start;
78 EXPORT_SYMBOL_GPL(zpci_iomap_start);
79
80 static struct kmem_cache *zdev_fmb_cache;
81
82 struct zpci_dev *get_zdev_by_fid(u32 fid)
83 {
84 struct zpci_dev *tmp, *zdev = NULL;
85
86 spin_lock(&zpci_list_lock);
87 list_for_each_entry(tmp, &zpci_list, entry) {
88 if (tmp->fid == fid) {
89 zdev = tmp;
90 break;
91 }
92 }
93 spin_unlock(&zpci_list_lock);
94 return zdev;
95 }
96
97 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
98 {
99 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
100 }
101
102 int pci_domain_nr(struct pci_bus *bus)
103 {
104 return ((struct zpci_dev *) bus->sysdata)->domain;
105 }
106 EXPORT_SYMBOL_GPL(pci_domain_nr);
107
108 int pci_proc_domain(struct pci_bus *bus)
109 {
110 return pci_domain_nr(bus);
111 }
112 EXPORT_SYMBOL_GPL(pci_proc_domain);
113
114 /* Modify PCI: Register adapter interruptions */
115 static int zpci_set_airq(struct zpci_dev *zdev)
116 {
117 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
118 struct zpci_fib fib = {0};
119
120 fib.isc = PCI_ISC;
121 fib.sum = 1; /* enable summary notifications */
122 fib.noi = airq_iv_end(zdev->aibv);
123 fib.aibv = (unsigned long) zdev->aibv->vector;
124 fib.aibvo = 0; /* each zdev has its own interrupt vector */
125 fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
126 fib.aisbo = zdev->aisb & 63;
127
128 return zpci_mod_fc(req, &fib);
129 }
130
131 struct mod_pci_args {
132 u64 base;
133 u64 limit;
134 u64 iota;
135 u64 fmb_addr;
136 };
137
138 static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
139 {
140 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
141 struct zpci_fib fib = {0};
142
143 fib.pba = args->base;
144 fib.pal = args->limit;
145 fib.iota = args->iota;
146 fib.fmb_addr = args->fmb_addr;
147
148 return zpci_mod_fc(req, &fib);
149 }
150
151 /* Modify PCI: Register I/O address translation parameters */
152 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
153 u64 base, u64 limit, u64 iota)
154 {
155 struct mod_pci_args args = { base, limit, iota, 0 };
156
157 WARN_ON_ONCE(iota & 0x3fff);
158 args.iota |= ZPCI_IOTA_RTTO_FLAG;
159 return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
160 }
161
162 /* Modify PCI: Unregister I/O address translation parameters */
163 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
164 {
165 struct mod_pci_args args = { 0, 0, 0, 0 };
166
167 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
168 }
169
170 /* Modify PCI: Unregister adapter interruptions */
171 static int zpci_clear_airq(struct zpci_dev *zdev)
172 {
173 struct mod_pci_args args = { 0, 0, 0, 0 };
174
175 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args);
176 }
177
178 /* Modify PCI: Set PCI function measurement parameters */
179 int zpci_fmb_enable_device(struct zpci_dev *zdev)
180 {
181 struct mod_pci_args args = { 0, 0, 0, 0 };
182
183 if (zdev->fmb)
184 return -EINVAL;
185
186 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
187 if (!zdev->fmb)
188 return -ENOMEM;
189 WARN_ON((u64) zdev->fmb & 0xf);
190
191 /* reset software counters */
192 atomic64_set(&zdev->allocated_pages, 0);
193 atomic64_set(&zdev->mapped_pages, 0);
194 atomic64_set(&zdev->unmapped_pages, 0);
195
196 args.fmb_addr = virt_to_phys(zdev->fmb);
197 return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
198 }
199
200 /* Modify PCI: Disable PCI function measurement */
201 int zpci_fmb_disable_device(struct zpci_dev *zdev)
202 {
203 struct mod_pci_args args = { 0, 0, 0, 0 };
204 int rc;
205
206 if (!zdev->fmb)
207 return -EINVAL;
208
209 /* Function measurement is disabled if fmb address is zero */
210 rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
211
212 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
213 zdev->fmb = NULL;
214 return rc;
215 }
216
217 #define ZPCI_PCIAS_CFGSPC 15
218
219 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
220 {
221 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
222 u64 data;
223 int rc;
224
225 rc = zpci_load(&data, req, offset);
226 if (!rc) {
227 data = data << ((8 - len) * 8);
228 data = le64_to_cpu(data);
229 *val = (u32) data;
230 } else
231 *val = 0xffffffff;
232 return rc;
233 }
234
235 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
236 {
237 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
238 u64 data = val;
239 int rc;
240
241 data = cpu_to_le64(data);
242 data = data >> ((8 - len) * 8);
243 rc = zpci_store(data, req, offset);
244 return rc;
245 }
246
247 void pcibios_fixup_bus(struct pci_bus *bus)
248 {
249 }
250
251 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
252 resource_size_t size,
253 resource_size_t align)
254 {
255 return 0;
256 }
257
258 /* combine single writes by using store-block insn */
259 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
260 {
261 zpci_memcpy_toio(to, from, count);
262 }
263
264 /* Create a virtual mapping cookie for a PCI BAR */
265 void __iomem *pci_iomap_range(struct pci_dev *pdev,
266 int bar,
267 unsigned long offset,
268 unsigned long max)
269 {
270 struct zpci_dev *zdev = to_zpci(pdev);
271 int idx;
272
273 if (!pci_resource_len(pdev, bar))
274 return NULL;
275
276 idx = zdev->bars[bar].map_idx;
277 spin_lock(&zpci_iomap_lock);
278 /* Detect overrun */
279 WARN_ON(!++zpci_iomap_start[idx].count);
280 zpci_iomap_start[idx].fh = zdev->fh;
281 zpci_iomap_start[idx].bar = bar;
282 spin_unlock(&zpci_iomap_lock);
283
284 return (void __iomem *) ZPCI_ADDR(idx) + offset;
285 }
286 EXPORT_SYMBOL(pci_iomap_range);
287
288 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
289 {
290 return pci_iomap_range(dev, bar, 0, maxlen);
291 }
292 EXPORT_SYMBOL(pci_iomap);
293
294 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
295 {
296 unsigned int idx = ZPCI_IDX(addr);
297
298 spin_lock(&zpci_iomap_lock);
299 /* Detect underrun */
300 WARN_ON(!zpci_iomap_start[idx].count);
301 if (!--zpci_iomap_start[idx].count) {
302 zpci_iomap_start[idx].fh = 0;
303 zpci_iomap_start[idx].bar = 0;
304 }
305 spin_unlock(&zpci_iomap_lock);
306 }
307 EXPORT_SYMBOL(pci_iounmap);
308
309 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
310 int size, u32 *val)
311 {
312 struct zpci_dev *zdev = get_zdev_by_bus(bus);
313 int ret;
314
315 if (!zdev || devfn != ZPCI_DEVFN)
316 ret = -ENODEV;
317 else
318 ret = zpci_cfg_load(zdev, where, val, size);
319
320 return ret;
321 }
322
323 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
324 int size, u32 val)
325 {
326 struct zpci_dev *zdev = get_zdev_by_bus(bus);
327 int ret;
328
329 if (!zdev || devfn != ZPCI_DEVFN)
330 ret = -ENODEV;
331 else
332 ret = zpci_cfg_store(zdev, where, val, size);
333
334 return ret;
335 }
336
337 static struct pci_ops pci_root_ops = {
338 .read = pci_read,
339 .write = pci_write,
340 };
341
342 static void zpci_irq_handler(struct airq_struct *airq)
343 {
344 unsigned long si, ai;
345 struct airq_iv *aibv;
346 int irqs_on = 0;
347
348 inc_irq_stat(IRQIO_PCI);
349 for (si = 0;;) {
350 /* Scan adapter summary indicator bit vector */
351 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
352 if (si == -1UL) {
353 if (irqs_on++)
354 /* End of second scan with interrupts on. */
355 break;
356 /* First scan complete, reenable interrupts. */
357 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
358 si = 0;
359 continue;
360 }
361
362 /* Scan the adapter interrupt vector for this device. */
363 aibv = zpci_aibv[si];
364 for (ai = 0;;) {
365 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
366 if (ai == -1UL)
367 break;
368 inc_irq_stat(IRQIO_MSI);
369 airq_iv_lock(aibv, ai);
370 generic_handle_irq(airq_iv_get_data(aibv, ai));
371 airq_iv_unlock(aibv, ai);
372 }
373 }
374 }
375
376 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
377 {
378 struct zpci_dev *zdev = to_zpci(pdev);
379 unsigned int hwirq, msi_vecs;
380 unsigned long aisb;
381 struct msi_desc *msi;
382 struct msi_msg msg;
383 int rc, irq;
384
385 if (type == PCI_CAP_ID_MSI && nvec > 1)
386 return 1;
387 msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
388
389 /* Allocate adapter summary indicator bit */
390 rc = -EIO;
391 aisb = airq_iv_alloc_bit(zpci_aisb_iv);
392 if (aisb == -1UL)
393 goto out;
394 zdev->aisb = aisb;
395
396 /* Create adapter interrupt vector */
397 rc = -ENOMEM;
398 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
399 if (!zdev->aibv)
400 goto out_si;
401
402 /* Wire up shortcut pointer */
403 zpci_aibv[aisb] = zdev->aibv;
404
405 /* Request MSI interrupts */
406 hwirq = 0;
407 for_each_pci_msi_entry(msi, pdev) {
408 rc = -EIO;
409 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */
410 if (irq < 0)
411 goto out_msi;
412 rc = irq_set_msi_desc(irq, msi);
413 if (rc)
414 goto out_msi;
415 irq_set_chip_and_handler(irq, &zpci_irq_chip,
416 handle_simple_irq);
417 msg.data = hwirq;
418 msg.address_lo = zdev->msi_addr & 0xffffffff;
419 msg.address_hi = zdev->msi_addr >> 32;
420 pci_write_msi_msg(irq, &msg);
421 airq_iv_set_data(zdev->aibv, hwirq, irq);
422 hwirq++;
423 }
424
425 /* Enable adapter interrupts */
426 rc = zpci_set_airq(zdev);
427 if (rc)
428 goto out_msi;
429
430 return (msi_vecs == nvec) ? 0 : msi_vecs;
431
432 out_msi:
433 for_each_pci_msi_entry(msi, pdev) {
434 if (hwirq-- == 0)
435 break;
436 irq_set_msi_desc(msi->irq, NULL);
437 irq_free_desc(msi->irq);
438 msi->msg.address_lo = 0;
439 msi->msg.address_hi = 0;
440 msi->msg.data = 0;
441 msi->irq = 0;
442 }
443 zpci_aibv[aisb] = NULL;
444 airq_iv_release(zdev->aibv);
445 out_si:
446 airq_iv_free_bit(zpci_aisb_iv, aisb);
447 out:
448 return rc;
449 }
450
451 void arch_teardown_msi_irqs(struct pci_dev *pdev)
452 {
453 struct zpci_dev *zdev = to_zpci(pdev);
454 struct msi_desc *msi;
455 int rc;
456
457 /* Disable adapter interrupts */
458 rc = zpci_clear_airq(zdev);
459 if (rc)
460 return;
461
462 /* Release MSI interrupts */
463 for_each_pci_msi_entry(msi, pdev) {
464 if (msi->msi_attrib.is_msix)
465 __pci_msix_desc_mask_irq(msi, 1);
466 else
467 __pci_msi_desc_mask_irq(msi, 1, 1);
468 irq_set_msi_desc(msi->irq, NULL);
469 irq_free_desc(msi->irq);
470 msi->msg.address_lo = 0;
471 msi->msg.address_hi = 0;
472 msi->msg.data = 0;
473 msi->irq = 0;
474 }
475
476 zpci_aibv[zdev->aisb] = NULL;
477 airq_iv_release(zdev->aibv);
478 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
479 }
480
481 static void zpci_map_resources(struct pci_dev *pdev)
482 {
483 resource_size_t len;
484 int i;
485
486 for (i = 0; i < PCI_BAR_COUNT; i++) {
487 len = pci_resource_len(pdev, i);
488 if (!len)
489 continue;
490 pdev->resource[i].start =
491 (resource_size_t __force) pci_iomap(pdev, i, 0);
492 pdev->resource[i].end = pdev->resource[i].start + len - 1;
493 }
494 }
495
496 static void zpci_unmap_resources(struct pci_dev *pdev)
497 {
498 resource_size_t len;
499 int i;
500
501 for (i = 0; i < PCI_BAR_COUNT; i++) {
502 len = pci_resource_len(pdev, i);
503 if (!len)
504 continue;
505 pci_iounmap(pdev, (void __iomem __force *)
506 pdev->resource[i].start);
507 }
508 }
509
510 static int __init zpci_irq_init(void)
511 {
512 int rc;
513
514 rc = register_adapter_interrupt(&zpci_airq);
515 if (rc)
516 goto out;
517 /* Set summary to 1 to be called every time for the ISC. */
518 *zpci_airq.lsi_ptr = 1;
519
520 rc = -ENOMEM;
521 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
522 if (!zpci_aisb_iv)
523 goto out_airq;
524
525 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
526 return 0;
527
528 out_airq:
529 unregister_adapter_interrupt(&zpci_airq);
530 out:
531 return rc;
532 }
533
534 static void zpci_irq_exit(void)
535 {
536 airq_iv_release(zpci_aisb_iv);
537 unregister_adapter_interrupt(&zpci_airq);
538 }
539
540 static int zpci_alloc_iomap(struct zpci_dev *zdev)
541 {
542 unsigned long entry;
543
544 spin_lock(&zpci_iomap_lock);
545 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
546 if (entry == ZPCI_IOMAP_ENTRIES) {
547 spin_unlock(&zpci_iomap_lock);
548 return -ENOSPC;
549 }
550 set_bit(entry, zpci_iomap_bitmap);
551 spin_unlock(&zpci_iomap_lock);
552 return entry;
553 }
554
555 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
556 {
557 spin_lock(&zpci_iomap_lock);
558 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
559 clear_bit(entry, zpci_iomap_bitmap);
560 spin_unlock(&zpci_iomap_lock);
561 }
562
563 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
564 unsigned long size, unsigned long flags)
565 {
566 struct resource *r;
567
568 r = kzalloc(sizeof(*r), GFP_KERNEL);
569 if (!r)
570 return NULL;
571
572 r->start = start;
573 r->end = r->start + size - 1;
574 r->flags = flags;
575 r->name = zdev->res_name;
576
577 if (request_resource(&iomem_resource, r)) {
578 kfree(r);
579 return NULL;
580 }
581 return r;
582 }
583
584 static int zpci_setup_bus_resources(struct zpci_dev *zdev,
585 struct list_head *resources)
586 {
587 unsigned long addr, size, flags;
588 struct resource *res;
589 int i, entry;
590
591 snprintf(zdev->res_name, sizeof(zdev->res_name),
592 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
593
594 for (i = 0; i < PCI_BAR_COUNT; i++) {
595 if (!zdev->bars[i].size)
596 continue;
597 entry = zpci_alloc_iomap(zdev);
598 if (entry < 0)
599 return entry;
600 zdev->bars[i].map_idx = entry;
601
602 /* only MMIO is supported */
603 flags = IORESOURCE_MEM;
604 if (zdev->bars[i].val & 8)
605 flags |= IORESOURCE_PREFETCH;
606 if (zdev->bars[i].val & 4)
607 flags |= IORESOURCE_MEM_64;
608
609 addr = ZPCI_ADDR(entry);
610 size = 1UL << zdev->bars[i].size;
611
612 res = __alloc_res(zdev, addr, size, flags);
613 if (!res) {
614 zpci_free_iomap(zdev, entry);
615 return -ENOMEM;
616 }
617 zdev->bars[i].res = res;
618 pci_add_resource(resources, res);
619 }
620
621 return 0;
622 }
623
624 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
625 {
626 int i;
627
628 for (i = 0; i < PCI_BAR_COUNT; i++) {
629 if (!zdev->bars[i].size || !zdev->bars[i].res)
630 continue;
631
632 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
633 release_resource(zdev->bars[i].res);
634 kfree(zdev->bars[i].res);
635 }
636 }
637
638 int pcibios_add_device(struct pci_dev *pdev)
639 {
640 struct resource *res;
641 int i;
642
643 pdev->dev.groups = zpci_attr_groups;
644 pdev->dev.archdata.dma_ops = &s390_pci_dma_ops;
645 zpci_map_resources(pdev);
646
647 for (i = 0; i < PCI_BAR_COUNT; i++) {
648 res = &pdev->resource[i];
649 if (res->parent || !res->flags)
650 continue;
651 pci_claim_resource(pdev, i);
652 }
653
654 return 0;
655 }
656
657 void pcibios_release_device(struct pci_dev *pdev)
658 {
659 zpci_unmap_resources(pdev);
660 }
661
662 int pcibios_enable_device(struct pci_dev *pdev, int mask)
663 {
664 struct zpci_dev *zdev = to_zpci(pdev);
665
666 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
667 zpci_fmb_enable_device(zdev);
668
669 return pci_enable_resources(pdev, mask);
670 }
671
672 void pcibios_disable_device(struct pci_dev *pdev)
673 {
674 struct zpci_dev *zdev = to_zpci(pdev);
675
676 zpci_fmb_disable_device(zdev);
677 zpci_debug_exit_device(zdev);
678 }
679
680 #ifdef CONFIG_HIBERNATE_CALLBACKS
681 static int zpci_restore(struct device *dev)
682 {
683 struct pci_dev *pdev = to_pci_dev(dev);
684 struct zpci_dev *zdev = to_zpci(pdev);
685 int ret = 0;
686
687 if (zdev->state != ZPCI_FN_STATE_ONLINE)
688 goto out;
689
690 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
691 if (ret)
692 goto out;
693
694 zpci_map_resources(pdev);
695 zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
696 (u64) zdev->dma_table);
697
698 out:
699 return ret;
700 }
701
702 static int zpci_freeze(struct device *dev)
703 {
704 struct pci_dev *pdev = to_pci_dev(dev);
705 struct zpci_dev *zdev = to_zpci(pdev);
706
707 if (zdev->state != ZPCI_FN_STATE_ONLINE)
708 return 0;
709
710 zpci_unregister_ioat(zdev, 0);
711 zpci_unmap_resources(pdev);
712 return clp_disable_fh(zdev);
713 }
714
715 struct dev_pm_ops pcibios_pm_ops = {
716 .thaw_noirq = zpci_restore,
717 .freeze_noirq = zpci_freeze,
718 .restore_noirq = zpci_restore,
719 .poweroff_noirq = zpci_freeze,
720 };
721 #endif /* CONFIG_HIBERNATE_CALLBACKS */
722
723 static int zpci_alloc_domain(struct zpci_dev *zdev)
724 {
725 spin_lock(&zpci_domain_lock);
726 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
727 if (zdev->domain == ZPCI_NR_DEVICES) {
728 spin_unlock(&zpci_domain_lock);
729 return -ENOSPC;
730 }
731 set_bit(zdev->domain, zpci_domain);
732 spin_unlock(&zpci_domain_lock);
733 return 0;
734 }
735
736 static void zpci_free_domain(struct zpci_dev *zdev)
737 {
738 spin_lock(&zpci_domain_lock);
739 clear_bit(zdev->domain, zpci_domain);
740 spin_unlock(&zpci_domain_lock);
741 }
742
743 void pcibios_remove_bus(struct pci_bus *bus)
744 {
745 struct zpci_dev *zdev = get_zdev_by_bus(bus);
746
747 zpci_exit_slot(zdev);
748 zpci_cleanup_bus_resources(zdev);
749 zpci_free_domain(zdev);
750
751 spin_lock(&zpci_list_lock);
752 list_del(&zdev->entry);
753 spin_unlock(&zpci_list_lock);
754
755 kfree(zdev);
756 }
757
758 static int zpci_scan_bus(struct zpci_dev *zdev)
759 {
760 LIST_HEAD(resources);
761 int ret;
762
763 ret = zpci_setup_bus_resources(zdev, &resources);
764 if (ret)
765 goto error;
766
767 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
768 zdev, &resources);
769 if (!zdev->bus) {
770 ret = -EIO;
771 goto error;
772 }
773 zdev->bus->max_bus_speed = zdev->max_bus_speed;
774 pci_bus_add_devices(zdev->bus);
775 return 0;
776
777 error:
778 zpci_cleanup_bus_resources(zdev);
779 pci_free_resource_list(&resources);
780 return ret;
781 }
782
783 int zpci_enable_device(struct zpci_dev *zdev)
784 {
785 int rc;
786
787 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
788 if (rc)
789 goto out;
790
791 rc = zpci_dma_init_device(zdev);
792 if (rc)
793 goto out_dma;
794
795 zdev->state = ZPCI_FN_STATE_ONLINE;
796 return 0;
797
798 out_dma:
799 clp_disable_fh(zdev);
800 out:
801 return rc;
802 }
803 EXPORT_SYMBOL_GPL(zpci_enable_device);
804
805 int zpci_disable_device(struct zpci_dev *zdev)
806 {
807 zpci_dma_exit_device(zdev);
808 return clp_disable_fh(zdev);
809 }
810 EXPORT_SYMBOL_GPL(zpci_disable_device);
811
812 int zpci_create_device(struct zpci_dev *zdev)
813 {
814 int rc;
815
816 rc = zpci_alloc_domain(zdev);
817 if (rc)
818 goto out;
819
820 mutex_init(&zdev->lock);
821 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
822 rc = zpci_enable_device(zdev);
823 if (rc)
824 goto out_free;
825 }
826 rc = zpci_scan_bus(zdev);
827 if (rc)
828 goto out_disable;
829
830 spin_lock(&zpci_list_lock);
831 list_add_tail(&zdev->entry, &zpci_list);
832 spin_unlock(&zpci_list_lock);
833
834 zpci_init_slot(zdev);
835
836 return 0;
837
838 out_disable:
839 if (zdev->state == ZPCI_FN_STATE_ONLINE)
840 zpci_disable_device(zdev);
841 out_free:
842 zpci_free_domain(zdev);
843 out:
844 return rc;
845 }
846
847 void zpci_stop_device(struct zpci_dev *zdev)
848 {
849 zpci_dma_exit_device(zdev);
850 /*
851 * Note: SCLP disables fh via set-pci-fn so don't
852 * do that here.
853 */
854 }
855 EXPORT_SYMBOL_GPL(zpci_stop_device);
856
857 int zpci_report_error(struct pci_dev *pdev,
858 struct zpci_report_error_header *report)
859 {
860 struct zpci_dev *zdev = to_zpci(pdev);
861
862 return sclp_pci_report(report, zdev->fh, zdev->fid);
863 }
864 EXPORT_SYMBOL(zpci_report_error);
865
866 static inline int barsize(u8 size)
867 {
868 return (size) ? (1 << size) >> 10 : 0;
869 }
870
871 static int zpci_mem_init(void)
872 {
873 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
874 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
875
876 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
877 __alignof__(struct zpci_fmb), 0, NULL);
878 if (!zdev_fmb_cache)
879 goto error_fmb;
880
881 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
882 sizeof(*zpci_iomap_start), GFP_KERNEL);
883 if (!zpci_iomap_start)
884 goto error_iomap;
885
886 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
887 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
888 if (!zpci_iomap_bitmap)
889 goto error_iomap_bitmap;
890
891 return 0;
892 error_iomap_bitmap:
893 kfree(zpci_iomap_start);
894 error_iomap:
895 kmem_cache_destroy(zdev_fmb_cache);
896 error_fmb:
897 return -ENOMEM;
898 }
899
900 static void zpci_mem_exit(void)
901 {
902 kfree(zpci_iomap_bitmap);
903 kfree(zpci_iomap_start);
904 kmem_cache_destroy(zdev_fmb_cache);
905 }
906
907 static unsigned int s390_pci_probe = 1;
908 static unsigned int s390_pci_initialized;
909
910 char * __init pcibios_setup(char *str)
911 {
912 if (!strcmp(str, "off")) {
913 s390_pci_probe = 0;
914 return NULL;
915 }
916 return str;
917 }
918
919 bool zpci_is_enabled(void)
920 {
921 return s390_pci_initialized;
922 }
923
924 static int __init pci_base_init(void)
925 {
926 int rc;
927
928 if (!s390_pci_probe)
929 return 0;
930
931 if (!test_facility(69) || !test_facility(71) || !test_facility(72))
932 return 0;
933
934 rc = zpci_debug_init();
935 if (rc)
936 goto out;
937
938 rc = zpci_mem_init();
939 if (rc)
940 goto out_mem;
941
942 rc = zpci_irq_init();
943 if (rc)
944 goto out_irq;
945
946 rc = zpci_dma_init();
947 if (rc)
948 goto out_dma;
949
950 rc = clp_scan_pci_devices();
951 if (rc)
952 goto out_find;
953
954 s390_pci_initialized = 1;
955 return 0;
956
957 out_find:
958 zpci_dma_exit();
959 out_dma:
960 zpci_irq_exit();
961 out_irq:
962 zpci_mem_exit();
963 out_mem:
964 zpci_debug_exit();
965 out:
966 return rc;
967 }
968 subsys_initcall_sync(pci_base_init);
969
970 void zpci_rescan(void)
971 {
972 if (zpci_is_enabled())
973 clp_rescan_pci_devices_simple();
974 }
Linux kernel - Deliverables
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