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Linux 4.13.16
[linux/fpc-iii.git] / arch / s390 / pci / pci.c
blob7b30af5da222a947cceb1cf226945884e0682847
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 #define ZPCI_IOMAP_ENTRIES \
64 min(((unsigned long) ZPCI_NR_DEVICES * PCI_BAR_COUNT / 2), \
65 ZPCI_IOMAP_MAX_ENTRIES)
66
67 static DEFINE_SPINLOCK(zpci_iomap_lock);
68 static unsigned long *zpci_iomap_bitmap;
69 struct zpci_iomap_entry *zpci_iomap_start;
70 EXPORT_SYMBOL_GPL(zpci_iomap_start);
71
72 static struct kmem_cache *zdev_fmb_cache;
73
74 struct zpci_dev *get_zdev_by_fid(u32 fid)
75 {
76 struct zpci_dev *tmp, *zdev = NULL;
77
78 spin_lock(&zpci_list_lock);
79 list_for_each_entry(tmp, &zpci_list, entry) {
80 if (tmp->fid == fid) {
81 zdev = tmp;
82 break;
83 }
84 }
85 spin_unlock(&zpci_list_lock);
86 return zdev;
87 }
88
89 void zpci_remove_reserved_devices(void)
90 {
91 struct zpci_dev *tmp, *zdev;
92 enum zpci_state state;
93 LIST_HEAD(remove);
94
95 spin_lock(&zpci_list_lock);
96 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
97 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
98 !clp_get_state(zdev->fid, &state) &&
99 state == ZPCI_FN_STATE_RESERVED)
100 list_move_tail(&zdev->entry, &remove);
101 }
102 spin_unlock(&zpci_list_lock);
103
104 list_for_each_entry_safe(zdev, tmp, &remove, entry)
105 zpci_remove_device(zdev);
106 }
107
108 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
109 {
110 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
111 }
112
113 int pci_domain_nr(struct pci_bus *bus)
114 {
115 return ((struct zpci_dev *) bus->sysdata)->domain;
116 }
117 EXPORT_SYMBOL_GPL(pci_domain_nr);
118
119 int pci_proc_domain(struct pci_bus *bus)
120 {
121 return pci_domain_nr(bus);
122 }
123 EXPORT_SYMBOL_GPL(pci_proc_domain);
124
125 /* Modify PCI: Register adapter interruptions */
126 static int zpci_set_airq(struct zpci_dev *zdev)
127 {
128 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
129 struct zpci_fib fib = {0};
130 u8 status;
131
132 fib.isc = PCI_ISC;
133 fib.sum = 1; /* enable summary notifications */
134 fib.noi = airq_iv_end(zdev->aibv);
135 fib.aibv = (unsigned long) zdev->aibv->vector;
136 fib.aibvo = 0; /* each zdev has its own interrupt vector */
137 fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
138 fib.aisbo = zdev->aisb & 63;
139
140 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
141 }
142
143 /* Modify PCI: Unregister adapter interruptions */
144 static int zpci_clear_airq(struct zpci_dev *zdev)
145 {
146 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_DEREG_INT);
147 struct zpci_fib fib = {0};
148 u8 cc, status;
149
150 cc = zpci_mod_fc(req, &fib, &status);
151 if (cc == 3 || (cc == 1 && status == 24))
152 /* Function already gone or IRQs already deregistered. */
153 cc = 0;
154
155 return cc ? -EIO : 0;
156 }
157
158 /* Modify PCI: Register I/O address translation parameters */
159 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
160 u64 base, u64 limit, u64 iota)
161 {
162 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
163 struct zpci_fib fib = {0};
164 u8 status;
165
166 WARN_ON_ONCE(iota & 0x3fff);
167 fib.pba = base;
168 fib.pal = limit;
169 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
170 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
171 }
172
173 /* Modify PCI: Unregister I/O address translation parameters */
174 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
175 {
176 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
177 struct zpci_fib fib = {0};
178 u8 cc, status;
179
180 cc = zpci_mod_fc(req, &fib, &status);
181 if (cc == 3) /* Function already gone. */
182 cc = 0;
183 return cc ? -EIO : 0;
184 }
185
186 /* Modify PCI: Set PCI function measurement parameters */
187 int zpci_fmb_enable_device(struct zpci_dev *zdev)
188 {
189 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
190 struct zpci_fib fib = {0};
191 u8 cc, status;
192
193 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
194 return -EINVAL;
195
196 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
197 if (!zdev->fmb)
198 return -ENOMEM;
199 WARN_ON((u64) zdev->fmb & 0xf);
200
201 /* reset software counters */
202 atomic64_set(&zdev->allocated_pages, 0);
203 atomic64_set(&zdev->mapped_pages, 0);
204 atomic64_set(&zdev->unmapped_pages, 0);
205
206 fib.fmb_addr = virt_to_phys(zdev->fmb);
207 cc = zpci_mod_fc(req, &fib, &status);
208 if (cc) {
209 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
210 zdev->fmb = NULL;
211 }
212 return cc ? -EIO : 0;
213 }
214
215 /* Modify PCI: Disable PCI function measurement */
216 int zpci_fmb_disable_device(struct zpci_dev *zdev)
217 {
218 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
219 struct zpci_fib fib = {0};
220 u8 cc, status;
221
222 if (!zdev->fmb)
223 return -EINVAL;
224
225 /* Function measurement is disabled if fmb address is zero */
226 cc = zpci_mod_fc(req, &fib, &status);
227 if (cc == 3) /* Function already gone. */
228 cc = 0;
229
230 if (!cc) {
231 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
232 zdev->fmb = NULL;
233 }
234 return cc ? -EIO : 0;
235 }
236
237 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
238 {
239 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
240 u64 data;
241 int rc;
242
243 rc = zpci_load(&data, req, offset);
244 if (!rc) {
245 data = le64_to_cpu((__force __le64) data);
246 data >>= (8 - len) * 8;
247 *val = (u32) data;
248 } else
249 *val = 0xffffffff;
250 return rc;
251 }
252
253 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
254 {
255 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
256 u64 data = val;
257 int rc;
258
259 data <<= (8 - len) * 8;
260 data = (__force u64) cpu_to_le64(data);
261 rc = zpci_store(data, req, offset);
262 return rc;
263 }
264
265 void pcibios_fixup_bus(struct pci_bus *bus)
266 {
267 }
268
269 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
270 resource_size_t size,
271 resource_size_t align)
272 {
273 return 0;
274 }
275
276 /* combine single writes by using store-block insn */
277 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
278 {
279 zpci_memcpy_toio(to, from, count);
280 }
281
282 /* Create a virtual mapping cookie for a PCI BAR */
283 void __iomem *pci_iomap_range(struct pci_dev *pdev,
284 int bar,
285 unsigned long offset,
286 unsigned long max)
287 {
288 struct zpci_dev *zdev = to_zpci(pdev);
289 int idx;
290
291 if (!pci_resource_len(pdev, bar))
292 return NULL;
293
294 idx = zdev->bars[bar].map_idx;
295 spin_lock(&zpci_iomap_lock);
296 /* Detect overrun */
297 WARN_ON(!++zpci_iomap_start[idx].count);
298 zpci_iomap_start[idx].fh = zdev->fh;
299 zpci_iomap_start[idx].bar = bar;
300 spin_unlock(&zpci_iomap_lock);
301
302 return (void __iomem *) ZPCI_ADDR(idx) + offset;
303 }
304 EXPORT_SYMBOL(pci_iomap_range);
305
306 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
307 {
308 return pci_iomap_range(dev, bar, 0, maxlen);
309 }
310 EXPORT_SYMBOL(pci_iomap);
311
312 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
313 {
314 unsigned int idx = ZPCI_IDX(addr);
315
316 spin_lock(&zpci_iomap_lock);
317 /* Detect underrun */
318 WARN_ON(!zpci_iomap_start[idx].count);
319 if (!--zpci_iomap_start[idx].count) {
320 zpci_iomap_start[idx].fh = 0;
321 zpci_iomap_start[idx].bar = 0;
322 }
323 spin_unlock(&zpci_iomap_lock);
324 }
325 EXPORT_SYMBOL(pci_iounmap);
326
327 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
328 int size, u32 *val)
329 {
330 struct zpci_dev *zdev = get_zdev_by_bus(bus);
331 int ret;
332
333 if (!zdev || devfn != ZPCI_DEVFN)
334 ret = -ENODEV;
335 else
336 ret = zpci_cfg_load(zdev, where, val, size);
337
338 return ret;
339 }
340
341 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
342 int size, u32 val)
343 {
344 struct zpci_dev *zdev = get_zdev_by_bus(bus);
345 int ret;
346
347 if (!zdev || devfn != ZPCI_DEVFN)
348 ret = -ENODEV;
349 else
350 ret = zpci_cfg_store(zdev, where, val, size);
351
352 return ret;
353 }
354
355 static struct pci_ops pci_root_ops = {
356 .read = pci_read,
357 .write = pci_write,
358 };
359
360 static void zpci_irq_handler(struct airq_struct *airq)
361 {
362 unsigned long si, ai;
363 struct airq_iv *aibv;
364 int irqs_on = 0;
365
366 inc_irq_stat(IRQIO_PCI);
367 for (si = 0;;) {
368 /* Scan adapter summary indicator bit vector */
369 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
370 if (si == -1UL) {
371 if (irqs_on++)
372 /* End of second scan with interrupts on. */
373 break;
374 /* First scan complete, reenable interrupts. */
375 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
376 si = 0;
377 continue;
378 }
379
380 /* Scan the adapter interrupt vector for this device. */
381 aibv = zpci_aibv[si];
382 for (ai = 0;;) {
383 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
384 if (ai == -1UL)
385 break;
386 inc_irq_stat(IRQIO_MSI);
387 airq_iv_lock(aibv, ai);
388 generic_handle_irq(airq_iv_get_data(aibv, ai));
389 airq_iv_unlock(aibv, ai);
390 }
391 }
392 }
393
394 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
395 {
396 struct zpci_dev *zdev = to_zpci(pdev);
397 unsigned int hwirq, msi_vecs;
398 unsigned long aisb;
399 struct msi_desc *msi;
400 struct msi_msg msg;
401 int rc, irq;
402
403 zdev->aisb = -1UL;
404 if (type == PCI_CAP_ID_MSI && nvec > 1)
405 return 1;
406 msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
407
408 /* Allocate adapter summary indicator bit */
409 aisb = airq_iv_alloc_bit(zpci_aisb_iv);
410 if (aisb == -1UL)
411 return -EIO;
412 zdev->aisb = aisb;
413
414 /* Create adapter interrupt vector */
415 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
416 if (!zdev->aibv)
417 return -ENOMEM;
418
419 /* Wire up shortcut pointer */
420 zpci_aibv[aisb] = zdev->aibv;
421
422 /* Request MSI interrupts */
423 hwirq = 0;
424 for_each_pci_msi_entry(msi, pdev) {
425 rc = -EIO;
426 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */
427 if (irq < 0)
428 return -ENOMEM;
429 rc = irq_set_msi_desc(irq, msi);
430 if (rc)
431 return rc;
432 irq_set_chip_and_handler(irq, &zpci_irq_chip,
433 handle_simple_irq);
434 msg.data = hwirq;
435 msg.address_lo = zdev->msi_addr & 0xffffffff;
436 msg.address_hi = zdev->msi_addr >> 32;
437 pci_write_msi_msg(irq, &msg);
438 airq_iv_set_data(zdev->aibv, hwirq, irq);
439 hwirq++;
440 }
441
442 /* Enable adapter interrupts */
443 rc = zpci_set_airq(zdev);
444 if (rc)
445 return rc;
446
447 return (msi_vecs == nvec) ? 0 : msi_vecs;
448 }
449
450 void arch_teardown_msi_irqs(struct pci_dev *pdev)
451 {
452 struct zpci_dev *zdev = to_zpci(pdev);
453 struct msi_desc *msi;
454 int rc;
455
456 /* Disable adapter interrupts */
457 rc = zpci_clear_airq(zdev);
458 if (rc)
459 return;
460
461 /* Release MSI interrupts */
462 for_each_pci_msi_entry(msi, pdev) {
463 if (!msi->irq)
464 continue;
465 if (msi->msi_attrib.is_msix)
466 __pci_msix_desc_mask_irq(msi, 1);
467 else
468 __pci_msi_desc_mask_irq(msi, 1, 1);
469 irq_set_msi_desc(msi->irq, NULL);
470 irq_free_desc(msi->irq);
471 msi->msg.address_lo = 0;
472 msi->msg.address_hi = 0;
473 msi->msg.data = 0;
474 msi->irq = 0;
475 }
476
477 if (zdev->aisb != -1UL) {
478 zpci_aibv[zdev->aisb] = NULL;
479 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
480 zdev->aisb = -1UL;
481 }
482 if (zdev->aibv) {
483 airq_iv_release(zdev->aibv);
484 zdev->aibv = NULL;
485 }
486 }
487
488 static void zpci_map_resources(struct pci_dev *pdev)
489 {
490 resource_size_t len;
491 int i;
492
493 for (i = 0; i < PCI_BAR_COUNT; i++) {
494 len = pci_resource_len(pdev, i);
495 if (!len)
496 continue;
497 pdev->resource[i].start =
498 (resource_size_t __force) pci_iomap(pdev, i, 0);
499 pdev->resource[i].end = pdev->resource[i].start + len - 1;
500 }
501 }
502
503 static void zpci_unmap_resources(struct pci_dev *pdev)
504 {
505 resource_size_t len;
506 int i;
507
508 for (i = 0; i < PCI_BAR_COUNT; i++) {
509 len = pci_resource_len(pdev, i);
510 if (!len)
511 continue;
512 pci_iounmap(pdev, (void __iomem __force *)
513 pdev->resource[i].start);
514 }
515 }
516
517 static struct airq_struct zpci_airq = {
518 .handler = zpci_irq_handler,
519 .isc = PCI_ISC,
520 };
521
522 static int __init zpci_irq_init(void)
523 {
524 int rc;
525
526 rc = register_adapter_interrupt(&zpci_airq);
527 if (rc)
528 goto out;
529 /* Set summary to 1 to be called every time for the ISC. */
530 *zpci_airq.lsi_ptr = 1;
531
532 rc = -ENOMEM;
533 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
534 if (!zpci_aisb_iv)
535 goto out_airq;
536
537 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
538 return 0;
539
540 out_airq:
541 unregister_adapter_interrupt(&zpci_airq);
542 out:
543 return rc;
544 }
545
546 static void zpci_irq_exit(void)
547 {
548 airq_iv_release(zpci_aisb_iv);
549 unregister_adapter_interrupt(&zpci_airq);
550 }
551
552 static int zpci_alloc_iomap(struct zpci_dev *zdev)
553 {
554 unsigned long entry;
555
556 spin_lock(&zpci_iomap_lock);
557 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
558 if (entry == ZPCI_IOMAP_ENTRIES) {
559 spin_unlock(&zpci_iomap_lock);
560 return -ENOSPC;
561 }
562 set_bit(entry, zpci_iomap_bitmap);
563 spin_unlock(&zpci_iomap_lock);
564 return entry;
565 }
566
567 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
568 {
569 spin_lock(&zpci_iomap_lock);
570 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
571 clear_bit(entry, zpci_iomap_bitmap);
572 spin_unlock(&zpci_iomap_lock);
573 }
574
575 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
576 unsigned long size, unsigned long flags)
577 {
578 struct resource *r;
579
580 r = kzalloc(sizeof(*r), GFP_KERNEL);
581 if (!r)
582 return NULL;
583
584 r->start = start;
585 r->end = r->start + size - 1;
586 r->flags = flags;
587 r->name = zdev->res_name;
588
589 if (request_resource(&iomem_resource, r)) {
590 kfree(r);
591 return NULL;
592 }
593 return r;
594 }
595
596 static int zpci_setup_bus_resources(struct zpci_dev *zdev,
597 struct list_head *resources)
598 {
599 unsigned long addr, size, flags;
600 struct resource *res;
601 int i, entry;
602
603 snprintf(zdev->res_name, sizeof(zdev->res_name),
604 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
605
606 for (i = 0; i < PCI_BAR_COUNT; i++) {
607 if (!zdev->bars[i].size)
608 continue;
609 entry = zpci_alloc_iomap(zdev);
610 if (entry < 0)
611 return entry;
612 zdev->bars[i].map_idx = entry;
613
614 /* only MMIO is supported */
615 flags = IORESOURCE_MEM;
616 if (zdev->bars[i].val & 8)
617 flags |= IORESOURCE_PREFETCH;
618 if (zdev->bars[i].val & 4)
619 flags |= IORESOURCE_MEM_64;
620
621 addr = ZPCI_ADDR(entry);
622 size = 1UL << zdev->bars[i].size;
623
624 res = __alloc_res(zdev, addr, size, flags);
625 if (!res) {
626 zpci_free_iomap(zdev, entry);
627 return -ENOMEM;
628 }
629 zdev->bars[i].res = res;
630 pci_add_resource(resources, res);
631 }
632
633 return 0;
634 }
635
636 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
637 {
638 int i;
639
640 for (i = 0; i < PCI_BAR_COUNT; i++) {
641 if (!zdev->bars[i].size || !zdev->bars[i].res)
642 continue;
643
644 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
645 release_resource(zdev->bars[i].res);
646 kfree(zdev->bars[i].res);
647 }
648 }
649
650 int pcibios_add_device(struct pci_dev *pdev)
651 {
652 struct resource *res;
653 int i;
654
655 pdev->dev.groups = zpci_attr_groups;
656 pdev->dev.dma_ops = &s390_pci_dma_ops;
657 zpci_map_resources(pdev);
658
659 for (i = 0; i < PCI_BAR_COUNT; i++) {
660 res = &pdev->resource[i];
661 if (res->parent || !res->flags)
662 continue;
663 pci_claim_resource(pdev, i);
664 }
665
666 return 0;
667 }
668
669 void pcibios_release_device(struct pci_dev *pdev)
670 {
671 zpci_unmap_resources(pdev);
672 }
673
674 int pcibios_enable_device(struct pci_dev *pdev, int mask)
675 {
676 struct zpci_dev *zdev = to_zpci(pdev);
677
678 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
679 zpci_fmb_enable_device(zdev);
680
681 return pci_enable_resources(pdev, mask);
682 }
683
684 void pcibios_disable_device(struct pci_dev *pdev)
685 {
686 struct zpci_dev *zdev = to_zpci(pdev);
687
688 zpci_fmb_disable_device(zdev);
689 zpci_debug_exit_device(zdev);
690 }
691
692 #ifdef CONFIG_HIBERNATE_CALLBACKS
693 static int zpci_restore(struct device *dev)
694 {
695 struct pci_dev *pdev = to_pci_dev(dev);
696 struct zpci_dev *zdev = to_zpci(pdev);
697 int ret = 0;
698
699 if (zdev->state != ZPCI_FN_STATE_ONLINE)
700 goto out;
701
702 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
703 if (ret)
704 goto out;
705
706 zpci_map_resources(pdev);
707 zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
708 (u64) zdev->dma_table);
709
710 out:
711 return ret;
712 }
713
714 static int zpci_freeze(struct device *dev)
715 {
716 struct pci_dev *pdev = to_pci_dev(dev);
717 struct zpci_dev *zdev = to_zpci(pdev);
718
719 if (zdev->state != ZPCI_FN_STATE_ONLINE)
720 return 0;
721
722 zpci_unregister_ioat(zdev, 0);
723 zpci_unmap_resources(pdev);
724 return clp_disable_fh(zdev);
725 }
726
727 struct dev_pm_ops pcibios_pm_ops = {
728 .thaw_noirq = zpci_restore,
729 .freeze_noirq = zpci_freeze,
730 .restore_noirq = zpci_restore,
731 .poweroff_noirq = zpci_freeze,
732 };
733 #endif /* CONFIG_HIBERNATE_CALLBACKS */
734
735 static int zpci_alloc_domain(struct zpci_dev *zdev)
736 {
737 if (zpci_unique_uid) {
738 zdev->domain = (u16) zdev->uid;
739 if (zdev->domain >= ZPCI_NR_DEVICES)
740 return 0;
741
742 spin_lock(&zpci_domain_lock);
743 if (test_bit(zdev->domain, zpci_domain)) {
744 spin_unlock(&zpci_domain_lock);
745 return -EEXIST;
746 }
747 set_bit(zdev->domain, zpci_domain);
748 spin_unlock(&zpci_domain_lock);
749 return 0;
750 }
751
752 spin_lock(&zpci_domain_lock);
753 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
754 if (zdev->domain == ZPCI_NR_DEVICES) {
755 spin_unlock(&zpci_domain_lock);
756 return -ENOSPC;
757 }
758 set_bit(zdev->domain, zpci_domain);
759 spin_unlock(&zpci_domain_lock);
760 return 0;
761 }
762
763 static void zpci_free_domain(struct zpci_dev *zdev)
764 {
765 if (zdev->domain >= ZPCI_NR_DEVICES)
766 return;
767
768 spin_lock(&zpci_domain_lock);
769 clear_bit(zdev->domain, zpci_domain);
770 spin_unlock(&zpci_domain_lock);
771 }
772
773 void pcibios_remove_bus(struct pci_bus *bus)
774 {
775 struct zpci_dev *zdev = get_zdev_by_bus(bus);
776
777 zpci_exit_slot(zdev);
778 zpci_cleanup_bus_resources(zdev);
779 zpci_free_domain(zdev);
780
781 spin_lock(&zpci_list_lock);
782 list_del(&zdev->entry);
783 spin_unlock(&zpci_list_lock);
784
785 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
786 kfree(zdev);
787 }
788
789 static int zpci_scan_bus(struct zpci_dev *zdev)
790 {
791 LIST_HEAD(resources);
792 int ret;
793
794 ret = zpci_setup_bus_resources(zdev, &resources);
795 if (ret)
796 goto error;
797
798 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
799 zdev, &resources);
800 if (!zdev->bus) {
801 ret = -EIO;
802 goto error;
803 }
804 zdev->bus->max_bus_speed = zdev->max_bus_speed;
805 pci_bus_add_devices(zdev->bus);
806 return 0;
807
808 error:
809 zpci_cleanup_bus_resources(zdev);
810 pci_free_resource_list(&resources);
811 return ret;
812 }
813
814 int zpci_enable_device(struct zpci_dev *zdev)
815 {
816 int rc;
817
818 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
819 if (rc)
820 goto out;
821
822 rc = zpci_dma_init_device(zdev);
823 if (rc)
824 goto out_dma;
825
826 zdev->state = ZPCI_FN_STATE_ONLINE;
827 return 0;
828
829 out_dma:
830 clp_disable_fh(zdev);
831 out:
832 return rc;
833 }
834 EXPORT_SYMBOL_GPL(zpci_enable_device);
835
836 int zpci_disable_device(struct zpci_dev *zdev)
837 {
838 zpci_dma_exit_device(zdev);
839 return clp_disable_fh(zdev);
840 }
841 EXPORT_SYMBOL_GPL(zpci_disable_device);
842
843 int zpci_create_device(struct zpci_dev *zdev)
844 {
845 int rc;
846
847 rc = zpci_alloc_domain(zdev);
848 if (rc)
849 goto out;
850
851 mutex_init(&zdev->lock);
852 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
853 rc = zpci_enable_device(zdev);
854 if (rc)
855 goto out_free;
856 }
857 rc = zpci_scan_bus(zdev);
858 if (rc)
859 goto out_disable;
860
861 spin_lock(&zpci_list_lock);
862 list_add_tail(&zdev->entry, &zpci_list);
863 spin_unlock(&zpci_list_lock);
864
865 zpci_init_slot(zdev);
866
867 return 0;
868
869 out_disable:
870 if (zdev->state == ZPCI_FN_STATE_ONLINE)
871 zpci_disable_device(zdev);
872 out_free:
873 zpci_free_domain(zdev);
874 out:
875 return rc;
876 }
877
878 void zpci_remove_device(struct zpci_dev *zdev)
879 {
880 if (!zdev->bus)
881 return;
882
883 pci_stop_root_bus(zdev->bus);
884 pci_remove_root_bus(zdev->bus);
885 }
886
887 int zpci_report_error(struct pci_dev *pdev,
888 struct zpci_report_error_header *report)
889 {
890 struct zpci_dev *zdev = to_zpci(pdev);
891
892 return sclp_pci_report(report, zdev->fh, zdev->fid);
893 }
894 EXPORT_SYMBOL(zpci_report_error);
895
896 static int zpci_mem_init(void)
897 {
898 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
899 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
900
901 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
902 __alignof__(struct zpci_fmb), 0, NULL);
903 if (!zdev_fmb_cache)
904 goto error_fmb;
905
906 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
907 sizeof(*zpci_iomap_start), GFP_KERNEL);
908 if (!zpci_iomap_start)
909 goto error_iomap;
910
911 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
912 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
913 if (!zpci_iomap_bitmap)
914 goto error_iomap_bitmap;
915
916 return 0;
917 error_iomap_bitmap:
918 kfree(zpci_iomap_start);
919 error_iomap:
920 kmem_cache_destroy(zdev_fmb_cache);
921 error_fmb:
922 return -ENOMEM;
923 }
924
925 static void zpci_mem_exit(void)
926 {
927 kfree(zpci_iomap_bitmap);
928 kfree(zpci_iomap_start);
929 kmem_cache_destroy(zdev_fmb_cache);
930 }
931
932 static unsigned int s390_pci_probe = 1;
933 static unsigned int s390_pci_initialized;
934
935 char * __init pcibios_setup(char *str)
936 {
937 if (!strcmp(str, "off")) {
938 s390_pci_probe = 0;
939 return NULL;
940 }
941 return str;
942 }
943
944 bool zpci_is_enabled(void)
945 {
946 return s390_pci_initialized;
947 }
948
949 static int __init pci_base_init(void)
950 {
951 int rc;
952
953 if (!s390_pci_probe)
954 return 0;
955
956 if (!test_facility(69) || !test_facility(71) || !test_facility(72))
957 return 0;
958
959 rc = zpci_debug_init();
960 if (rc)
961 goto out;
962
963 rc = zpci_mem_init();
964 if (rc)
965 goto out_mem;
966
967 rc = zpci_irq_init();
968 if (rc)
969 goto out_irq;
970
971 rc = zpci_dma_init();
972 if (rc)
973 goto out_dma;
974
975 rc = clp_scan_pci_devices();
976 if (rc)
977 goto out_find;
978
979 s390_pci_initialized = 1;
980 return 0;
981
982 out_find:
983 zpci_dma_exit();
984 out_dma:
985 zpci_irq_exit();
986 out_irq:
987 zpci_mem_exit();
988 out_mem:
989 zpci_debug_exit();
990 out:
991 return rc;
992 }
993 subsys_initcall_sync(pci_base_init);
994
995 void zpci_rescan(void)
996 {
997 if (zpci_is_enabled())
998 clp_rescan_pci_devices_simple();
999 }
Linux with added FPC-III support