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sysfs: remove DEBUG defines
[linux/fpc-iii.git] / arch / s390 / pci / pci.c
blob4902fed221c0effa59ff21fedabdda152641d112
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright IBM Corp. 2012
4 *
5 * Author(s):
6 * Jan Glauber <jang@linux.vnet.ibm.com>
7 *
8 * The System z PCI code is a rewrite from a prototype by
9 * the following people (Kudoz!):
10 * Alexander Schmidt
11 * Christoph Raisch
12 * Hannes Hering
13 * Hoang-Nam Nguyen
14 * Jan-Bernd Themann
15 * Stefan Roscher
16 * Thomas Klein
17 */
18
19 #define KMSG_COMPONENT "zpci"
20 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
21
22 #include <linux/kernel.h>
23 #include <linux/slab.h>
24 #include <linux/err.h>
25 #include <linux/export.h>
26 #include <linux/delay.h>
27 #include <linux/irq.h>
28 #include <linux/kernel_stat.h>
29 #include <linux/seq_file.h>
30 #include <linux/pci.h>
31 #include <linux/msi.h>
32
33 #include <asm/isc.h>
34 #include <asm/airq.h>
35 #include <asm/facility.h>
36 #include <asm/pci_insn.h>
37 #include <asm/pci_clp.h>
38 #include <asm/pci_dma.h>
39
40 #define DEBUG /* enable pr_debug */
41
42 #define SIC_IRQ_MODE_ALL 0
43 #define SIC_IRQ_MODE_SINGLE 1
44
45 #define ZPCI_NR_DMA_SPACES 1
46 #define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
47
48 /* list of all detected zpci devices */
49 static LIST_HEAD(zpci_list);
50 static DEFINE_SPINLOCK(zpci_list_lock);
51
52 static struct irq_chip zpci_irq_chip = {
53 .name = "zPCI",
54 .irq_unmask = pci_msi_unmask_irq,
55 .irq_mask = pci_msi_mask_irq,
56 };
57
58 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
59 static DEFINE_SPINLOCK(zpci_domain_lock);
60
61 static struct airq_iv *zpci_aisb_iv;
62 static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];
63
64 #define ZPCI_IOMAP_ENTRIES \
65 min(((unsigned long) ZPCI_NR_DEVICES * PCI_BAR_COUNT / 2), \
66 ZPCI_IOMAP_MAX_ENTRIES)
67
68 static DEFINE_SPINLOCK(zpci_iomap_lock);
69 static unsigned long *zpci_iomap_bitmap;
70 struct zpci_iomap_entry *zpci_iomap_start;
71 EXPORT_SYMBOL_GPL(zpci_iomap_start);
72
73 static struct kmem_cache *zdev_fmb_cache;
74
75 struct zpci_dev *get_zdev_by_fid(u32 fid)
76 {
77 struct zpci_dev *tmp, *zdev = NULL;
78
79 spin_lock(&zpci_list_lock);
80 list_for_each_entry(tmp, &zpci_list, entry) {
81 if (tmp->fid == fid) {
82 zdev = tmp;
83 break;
84 }
85 }
86 spin_unlock(&zpci_list_lock);
87 return zdev;
88 }
89
90 void zpci_remove_reserved_devices(void)
91 {
92 struct zpci_dev *tmp, *zdev;
93 enum zpci_state state;
94 LIST_HEAD(remove);
95
96 spin_lock(&zpci_list_lock);
97 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
98 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
99 !clp_get_state(zdev->fid, &state) &&
100 state == ZPCI_FN_STATE_RESERVED)
101 list_move_tail(&zdev->entry, &remove);
102 }
103 spin_unlock(&zpci_list_lock);
104
105 list_for_each_entry_safe(zdev, tmp, &remove, entry)
106 zpci_remove_device(zdev);
107 }
108
109 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
110 {
111 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
112 }
113
114 int pci_domain_nr(struct pci_bus *bus)
115 {
116 return ((struct zpci_dev *) bus->sysdata)->domain;
117 }
118 EXPORT_SYMBOL_GPL(pci_domain_nr);
119
120 int pci_proc_domain(struct pci_bus *bus)
121 {
122 return pci_domain_nr(bus);
123 }
124 EXPORT_SYMBOL_GPL(pci_proc_domain);
125
126 /* Modify PCI: Register adapter interruptions */
127 static int zpci_set_airq(struct zpci_dev *zdev)
128 {
129 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
130 struct zpci_fib fib = {0};
131 u8 status;
132
133 fib.isc = PCI_ISC;
134 fib.sum = 1; /* enable summary notifications */
135 fib.noi = airq_iv_end(zdev->aibv);
136 fib.aibv = (unsigned long) zdev->aibv->vector;
137 fib.aibvo = 0; /* each zdev has its own interrupt vector */
138 fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
139 fib.aisbo = zdev->aisb & 63;
140
141 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
142 }
143
144 /* Modify PCI: Unregister adapter interruptions */
145 static int zpci_clear_airq(struct zpci_dev *zdev)
146 {
147 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_DEREG_INT);
148 struct zpci_fib fib = {0};
149 u8 cc, status;
150
151 cc = zpci_mod_fc(req, &fib, &status);
152 if (cc == 3 || (cc == 1 && status == 24))
153 /* Function already gone or IRQs already deregistered. */
154 cc = 0;
155
156 return cc ? -EIO : 0;
157 }
158
159 /* Modify PCI: Register I/O address translation parameters */
160 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
161 u64 base, u64 limit, u64 iota)
162 {
163 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
164 struct zpci_fib fib = {0};
165 u8 status;
166
167 WARN_ON_ONCE(iota & 0x3fff);
168 fib.pba = base;
169 fib.pal = limit;
170 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
171 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
172 }
173
174 /* Modify PCI: Unregister I/O address translation parameters */
175 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
176 {
177 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
178 struct zpci_fib fib = {0};
179 u8 cc, status;
180
181 cc = zpci_mod_fc(req, &fib, &status);
182 if (cc == 3) /* Function already gone. */
183 cc = 0;
184 return cc ? -EIO : 0;
185 }
186
187 /* Modify PCI: Set PCI function measurement parameters */
188 int zpci_fmb_enable_device(struct zpci_dev *zdev)
189 {
190 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
191 struct zpci_fib fib = {0};
192 u8 cc, status;
193
194 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
195 return -EINVAL;
196
197 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
198 if (!zdev->fmb)
199 return -ENOMEM;
200 WARN_ON((u64) zdev->fmb & 0xf);
201
202 /* reset software counters */
203 atomic64_set(&zdev->allocated_pages, 0);
204 atomic64_set(&zdev->mapped_pages, 0);
205 atomic64_set(&zdev->unmapped_pages, 0);
206
207 fib.fmb_addr = virt_to_phys(zdev->fmb);
208 cc = zpci_mod_fc(req, &fib, &status);
209 if (cc) {
210 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
211 zdev->fmb = NULL;
212 }
213 return cc ? -EIO : 0;
214 }
215
216 /* Modify PCI: Disable PCI function measurement */
217 int zpci_fmb_disable_device(struct zpci_dev *zdev)
218 {
219 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
220 struct zpci_fib fib = {0};
221 u8 cc, status;
222
223 if (!zdev->fmb)
224 return -EINVAL;
225
226 /* Function measurement is disabled if fmb address is zero */
227 cc = zpci_mod_fc(req, &fib, &status);
228 if (cc == 3) /* Function already gone. */
229 cc = 0;
230
231 if (!cc) {
232 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
233 zdev->fmb = NULL;
234 }
235 return cc ? -EIO : 0;
236 }
237
238 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
239 {
240 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
241 u64 data;
242 int rc;
243
244 rc = zpci_load(&data, req, offset);
245 if (!rc) {
246 data = le64_to_cpu((__force __le64) data);
247 data >>= (8 - len) * 8;
248 *val = (u32) data;
249 } else
250 *val = 0xffffffff;
251 return rc;
252 }
253
254 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
255 {
256 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
257 u64 data = val;
258 int rc;
259
260 data <<= (8 - len) * 8;
261 data = (__force u64) cpu_to_le64(data);
262 rc = zpci_store(data, req, offset);
263 return rc;
264 }
265
266 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
267 resource_size_t size,
268 resource_size_t align)
269 {
270 return 0;
271 }
272
273 /* combine single writes by using store-block insn */
274 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
275 {
276 zpci_memcpy_toio(to, from, count);
277 }
278
279 /* Create a virtual mapping cookie for a PCI BAR */
280 void __iomem *pci_iomap_range(struct pci_dev *pdev,
281 int bar,
282 unsigned long offset,
283 unsigned long max)
284 {
285 struct zpci_dev *zdev = to_zpci(pdev);
286 int idx;
287
288 if (!pci_resource_len(pdev, bar))
289 return NULL;
290
291 idx = zdev->bars[bar].map_idx;
292 spin_lock(&zpci_iomap_lock);
293 /* Detect overrun */
294 WARN_ON(!++zpci_iomap_start[idx].count);
295 zpci_iomap_start[idx].fh = zdev->fh;
296 zpci_iomap_start[idx].bar = bar;
297 spin_unlock(&zpci_iomap_lock);
298
299 return (void __iomem *) ZPCI_ADDR(idx) + offset;
300 }
301 EXPORT_SYMBOL(pci_iomap_range);
302
303 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
304 {
305 return pci_iomap_range(dev, bar, 0, maxlen);
306 }
307 EXPORT_SYMBOL(pci_iomap);
308
309 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
310 {
311 unsigned int idx = ZPCI_IDX(addr);
312
313 spin_lock(&zpci_iomap_lock);
314 /* Detect underrun */
315 WARN_ON(!zpci_iomap_start[idx].count);
316 if (!--zpci_iomap_start[idx].count) {
317 zpci_iomap_start[idx].fh = 0;
318 zpci_iomap_start[idx].bar = 0;
319 }
320 spin_unlock(&zpci_iomap_lock);
321 }
322 EXPORT_SYMBOL(pci_iounmap);
323
324 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
325 int size, u32 *val)
326 {
327 struct zpci_dev *zdev = get_zdev_by_bus(bus);
328 int ret;
329
330 if (!zdev || devfn != ZPCI_DEVFN)
331 ret = -ENODEV;
332 else
333 ret = zpci_cfg_load(zdev, where, val, size);
334
335 return ret;
336 }
337
338 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
339 int size, u32 val)
340 {
341 struct zpci_dev *zdev = get_zdev_by_bus(bus);
342 int ret;
343
344 if (!zdev || devfn != ZPCI_DEVFN)
345 ret = -ENODEV;
346 else
347 ret = zpci_cfg_store(zdev, where, val, size);
348
349 return ret;
350 }
351
352 static struct pci_ops pci_root_ops = {
353 .read = pci_read,
354 .write = pci_write,
355 };
356
357 static void zpci_irq_handler(struct airq_struct *airq)
358 {
359 unsigned long si, ai;
360 struct airq_iv *aibv;
361 int irqs_on = 0;
362
363 inc_irq_stat(IRQIO_PCI);
364 for (si = 0;;) {
365 /* Scan adapter summary indicator bit vector */
366 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
367 if (si == -1UL) {
368 if (irqs_on++)
369 /* End of second scan with interrupts on. */
370 break;
371 /* First scan complete, reenable interrupts. */
372 if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC))
373 break;
374 si = 0;
375 continue;
376 }
377
378 /* Scan the adapter interrupt vector for this device. */
379 aibv = zpci_aibv[si];
380 for (ai = 0;;) {
381 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
382 if (ai == -1UL)
383 break;
384 inc_irq_stat(IRQIO_MSI);
385 airq_iv_lock(aibv, ai);
386 generic_handle_irq(airq_iv_get_data(aibv, ai));
387 airq_iv_unlock(aibv, ai);
388 }
389 }
390 }
391
392 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
393 {
394 struct zpci_dev *zdev = to_zpci(pdev);
395 unsigned int hwirq, msi_vecs;
396 unsigned long aisb;
397 struct msi_desc *msi;
398 struct msi_msg msg;
399 int rc, irq;
400
401 zdev->aisb = -1UL;
402 if (type == PCI_CAP_ID_MSI && nvec > 1)
403 return 1;
404 msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
405
406 /* Allocate adapter summary indicator bit */
407 aisb = airq_iv_alloc_bit(zpci_aisb_iv);
408 if (aisb == -1UL)
409 return -EIO;
410 zdev->aisb = aisb;
411
412 /* Create adapter interrupt vector */
413 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
414 if (!zdev->aibv)
415 return -ENOMEM;
416
417 /* Wire up shortcut pointer */
418 zpci_aibv[aisb] = zdev->aibv;
419
420 /* Request MSI interrupts */
421 hwirq = 0;
422 for_each_pci_msi_entry(msi, pdev) {
423 rc = -EIO;
424 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */
425 if (irq < 0)
426 return -ENOMEM;
427 rc = irq_set_msi_desc(irq, msi);
428 if (rc)
429 return rc;
430 irq_set_chip_and_handler(irq, &zpci_irq_chip,
431 handle_simple_irq);
432 msg.data = hwirq;
433 msg.address_lo = zdev->msi_addr & 0xffffffff;
434 msg.address_hi = zdev->msi_addr >> 32;
435 pci_write_msi_msg(irq, &msg);
436 airq_iv_set_data(zdev->aibv, hwirq, irq);
437 hwirq++;
438 }
439
440 /* Enable adapter interrupts */
441 rc = zpci_set_airq(zdev);
442 if (rc)
443 return rc;
444
445 return (msi_vecs == nvec) ? 0 : msi_vecs;
446 }
447
448 void arch_teardown_msi_irqs(struct pci_dev *pdev)
449 {
450 struct zpci_dev *zdev = to_zpci(pdev);
451 struct msi_desc *msi;
452 int rc;
453
454 /* Disable adapter interrupts */
455 rc = zpci_clear_airq(zdev);
456 if (rc)
457 return;
458
459 /* Release MSI interrupts */
460 for_each_pci_msi_entry(msi, pdev) {
461 if (!msi->irq)
462 continue;
463 if (msi->msi_attrib.is_msix)
464 __pci_msix_desc_mask_irq(msi, 1);
465 else
466 __pci_msi_desc_mask_irq(msi, 1, 1);
467 irq_set_msi_desc(msi->irq, NULL);
468 irq_free_desc(msi->irq);
469 msi->msg.address_lo = 0;
470 msi->msg.address_hi = 0;
471 msi->msg.data = 0;
472 msi->irq = 0;
473 }
474
475 if (zdev->aisb != -1UL) {
476 zpci_aibv[zdev->aisb] = NULL;
477 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
478 zdev->aisb = -1UL;
479 }
480 if (zdev->aibv) {
481 airq_iv_release(zdev->aibv);
482 zdev->aibv = NULL;
483 }
484 }
485
486 static void zpci_map_resources(struct pci_dev *pdev)
487 {
488 resource_size_t len;
489 int i;
490
491 for (i = 0; i < PCI_BAR_COUNT; i++) {
492 len = pci_resource_len(pdev, i);
493 if (!len)
494 continue;
495 pdev->resource[i].start =
496 (resource_size_t __force) pci_iomap(pdev, i, 0);
497 pdev->resource[i].end = pdev->resource[i].start + len - 1;
498 }
499 }
500
501 static void zpci_unmap_resources(struct pci_dev *pdev)
502 {
503 resource_size_t len;
504 int i;
505
506 for (i = 0; i < PCI_BAR_COUNT; i++) {
507 len = pci_resource_len(pdev, i);
508 if (!len)
509 continue;
510 pci_iounmap(pdev, (void __iomem __force *)
511 pdev->resource[i].start);
512 }
513 }
514
515 static struct airq_struct zpci_airq = {
516 .handler = zpci_irq_handler,
517 .isc = PCI_ISC,
518 };
519
520 static int __init zpci_irq_init(void)
521 {
522 int rc;
523
524 rc = register_adapter_interrupt(&zpci_airq);
525 if (rc)
526 goto out;
527 /* Set summary to 1 to be called every time for the ISC. */
528 *zpci_airq.lsi_ptr = 1;
529
530 rc = -ENOMEM;
531 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
532 if (!zpci_aisb_iv)
533 goto out_airq;
534
535 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
536 return 0;
537
538 out_airq:
539 unregister_adapter_interrupt(&zpci_airq);
540 out:
541 return rc;
542 }
543
544 static void zpci_irq_exit(void)
545 {
546 airq_iv_release(zpci_aisb_iv);
547 unregister_adapter_interrupt(&zpci_airq);
548 }
549
550 static int zpci_alloc_iomap(struct zpci_dev *zdev)
551 {
552 unsigned long entry;
553
554 spin_lock(&zpci_iomap_lock);
555 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
556 if (entry == ZPCI_IOMAP_ENTRIES) {
557 spin_unlock(&zpci_iomap_lock);
558 return -ENOSPC;
559 }
560 set_bit(entry, zpci_iomap_bitmap);
561 spin_unlock(&zpci_iomap_lock);
562 return entry;
563 }
564
565 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
566 {
567 spin_lock(&zpci_iomap_lock);
568 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
569 clear_bit(entry, zpci_iomap_bitmap);
570 spin_unlock(&zpci_iomap_lock);
571 }
572
573 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
574 unsigned long size, unsigned long flags)
575 {
576 struct resource *r;
577
578 r = kzalloc(sizeof(*r), GFP_KERNEL);
579 if (!r)
580 return NULL;
581
582 r->start = start;
583 r->end = r->start + size - 1;
584 r->flags = flags;
585 r->name = zdev->res_name;
586
587 if (request_resource(&iomem_resource, r)) {
588 kfree(r);
589 return NULL;
590 }
591 return r;
592 }
593
594 static int zpci_setup_bus_resources(struct zpci_dev *zdev,
595 struct list_head *resources)
596 {
597 unsigned long addr, size, flags;
598 struct resource *res;
599 int i, entry;
600
601 snprintf(zdev->res_name, sizeof(zdev->res_name),
602 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
603
604 for (i = 0; i < PCI_BAR_COUNT; i++) {
605 if (!zdev->bars[i].size)
606 continue;
607 entry = zpci_alloc_iomap(zdev);
608 if (entry < 0)
609 return entry;
610 zdev->bars[i].map_idx = entry;
611
612 /* only MMIO is supported */
613 flags = IORESOURCE_MEM;
614 if (zdev->bars[i].val & 8)
615 flags |= IORESOURCE_PREFETCH;
616 if (zdev->bars[i].val & 4)
617 flags |= IORESOURCE_MEM_64;
618
619 addr = ZPCI_ADDR(entry);
620 size = 1UL << zdev->bars[i].size;
621
622 res = __alloc_res(zdev, addr, size, flags);
623 if (!res) {
624 zpci_free_iomap(zdev, entry);
625 return -ENOMEM;
626 }
627 zdev->bars[i].res = res;
628 pci_add_resource(resources, res);
629 }
630
631 return 0;
632 }
633
634 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
635 {
636 int i;
637
638 for (i = 0; i < PCI_BAR_COUNT; i++) {
639 if (!zdev->bars[i].size || !zdev->bars[i].res)
640 continue;
641
642 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
643 release_resource(zdev->bars[i].res);
644 kfree(zdev->bars[i].res);
645 }
646 }
647
648 int pcibios_add_device(struct pci_dev *pdev)
649 {
650 struct resource *res;
651 int i;
652
653 pdev->dev.groups = zpci_attr_groups;
654 pdev->dev.dma_ops = &s390_pci_dma_ops;
655 zpci_map_resources(pdev);
656
657 for (i = 0; i < PCI_BAR_COUNT; i++) {
658 res = &pdev->resource[i];
659 if (res->parent || !res->flags)
660 continue;
661 pci_claim_resource(pdev, i);
662 }
663
664 return 0;
665 }
666
667 void pcibios_release_device(struct pci_dev *pdev)
668 {
669 zpci_unmap_resources(pdev);
670 }
671
672 int pcibios_enable_device(struct pci_dev *pdev, int mask)
673 {
674 struct zpci_dev *zdev = to_zpci(pdev);
675
676 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
677 zpci_fmb_enable_device(zdev);
678
679 return pci_enable_resources(pdev, mask);
680 }
681
682 void pcibios_disable_device(struct pci_dev *pdev)
683 {
684 struct zpci_dev *zdev = to_zpci(pdev);
685
686 zpci_fmb_disable_device(zdev);
687 zpci_debug_exit_device(zdev);
688 }
689
690 #ifdef CONFIG_HIBERNATE_CALLBACKS
691 static int zpci_restore(struct device *dev)
692 {
693 struct pci_dev *pdev = to_pci_dev(dev);
694 struct zpci_dev *zdev = to_zpci(pdev);
695 int ret = 0;
696
697 if (zdev->state != ZPCI_FN_STATE_ONLINE)
698 goto out;
699
700 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
701 if (ret)
702 goto out;
703
704 zpci_map_resources(pdev);
705 zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
706 (u64) zdev->dma_table);
707
708 out:
709 return ret;
710 }
711
712 static int zpci_freeze(struct device *dev)
713 {
714 struct pci_dev *pdev = to_pci_dev(dev);
715 struct zpci_dev *zdev = to_zpci(pdev);
716
717 if (zdev->state != ZPCI_FN_STATE_ONLINE)
718 return 0;
719
720 zpci_unregister_ioat(zdev, 0);
721 zpci_unmap_resources(pdev);
722 return clp_disable_fh(zdev);
723 }
724
725 struct dev_pm_ops pcibios_pm_ops = {
726 .thaw_noirq = zpci_restore,
727 .freeze_noirq = zpci_freeze,
728 .restore_noirq = zpci_restore,
729 .poweroff_noirq = zpci_freeze,
730 };
731 #endif /* CONFIG_HIBERNATE_CALLBACKS */
732
733 static int zpci_alloc_domain(struct zpci_dev *zdev)
734 {
735 if (zpci_unique_uid) {
736 zdev->domain = (u16) zdev->uid;
737 if (zdev->domain >= ZPCI_NR_DEVICES)
738 return 0;
739
740 spin_lock(&zpci_domain_lock);
741 if (test_bit(zdev->domain, zpci_domain)) {
742 spin_unlock(&zpci_domain_lock);
743 return -EEXIST;
744 }
745 set_bit(zdev->domain, zpci_domain);
746 spin_unlock(&zpci_domain_lock);
747 return 0;
748 }
749
750 spin_lock(&zpci_domain_lock);
751 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
752 if (zdev->domain == ZPCI_NR_DEVICES) {
753 spin_unlock(&zpci_domain_lock);
754 return -ENOSPC;
755 }
756 set_bit(zdev->domain, zpci_domain);
757 spin_unlock(&zpci_domain_lock);
758 return 0;
759 }
760
761 static void zpci_free_domain(struct zpci_dev *zdev)
762 {
763 if (zdev->domain >= ZPCI_NR_DEVICES)
764 return;
765
766 spin_lock(&zpci_domain_lock);
767 clear_bit(zdev->domain, zpci_domain);
768 spin_unlock(&zpci_domain_lock);
769 }
770
771 void pcibios_remove_bus(struct pci_bus *bus)
772 {
773 struct zpci_dev *zdev = get_zdev_by_bus(bus);
774
775 zpci_exit_slot(zdev);
776 zpci_cleanup_bus_resources(zdev);
777 zpci_destroy_iommu(zdev);
778 zpci_free_domain(zdev);
779
780 spin_lock(&zpci_list_lock);
781 list_del(&zdev->entry);
782 spin_unlock(&zpci_list_lock);
783
784 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
785 kfree(zdev);
786 }
787
788 static int zpci_scan_bus(struct zpci_dev *zdev)
789 {
790 LIST_HEAD(resources);
791 int ret;
792
793 ret = zpci_setup_bus_resources(zdev, &resources);
794 if (ret)
795 goto error;
796
797 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
798 zdev, &resources);
799 if (!zdev->bus) {
800 ret = -EIO;
801 goto error;
802 }
803 zdev->bus->max_bus_speed = zdev->max_bus_speed;
804 pci_bus_add_devices(zdev->bus);
805 return 0;
806
807 error:
808 zpci_cleanup_bus_resources(zdev);
809 pci_free_resource_list(&resources);
810 return ret;
811 }
812
813 int zpci_enable_device(struct zpci_dev *zdev)
814 {
815 int rc;
816
817 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
818 if (rc)
819 goto out;
820
821 rc = zpci_dma_init_device(zdev);
822 if (rc)
823 goto out_dma;
824
825 zdev->state = ZPCI_FN_STATE_ONLINE;
826 return 0;
827
828 out_dma:
829 clp_disable_fh(zdev);
830 out:
831 return rc;
832 }
833 EXPORT_SYMBOL_GPL(zpci_enable_device);
834
835 int zpci_disable_device(struct zpci_dev *zdev)
836 {
837 zpci_dma_exit_device(zdev);
838 return clp_disable_fh(zdev);
839 }
840 EXPORT_SYMBOL_GPL(zpci_disable_device);
841
842 int zpci_create_device(struct zpci_dev *zdev)
843 {
844 int rc;
845
846 rc = zpci_alloc_domain(zdev);
847 if (rc)
848 goto out;
849
850 rc = zpci_init_iommu(zdev);
851 if (rc)
852 goto out_free;
853
854 mutex_init(&zdev->lock);
855 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
856 rc = zpci_enable_device(zdev);
857 if (rc)
858 goto out_destroy_iommu;
859 }
860 rc = zpci_scan_bus(zdev);
861 if (rc)
862 goto out_disable;
863
864 spin_lock(&zpci_list_lock);
865 list_add_tail(&zdev->entry, &zpci_list);
866 spin_unlock(&zpci_list_lock);
867
868 zpci_init_slot(zdev);
869
870 return 0;
871
872 out_disable:
873 if (zdev->state == ZPCI_FN_STATE_ONLINE)
874 zpci_disable_device(zdev);
875 out_destroy_iommu:
876 zpci_destroy_iommu(zdev);
877 out_free:
878 zpci_free_domain(zdev);
879 out:
880 return rc;
881 }
882
883 void zpci_remove_device(struct zpci_dev *zdev)
884 {
885 if (!zdev->bus)
886 return;
887
888 pci_stop_root_bus(zdev->bus);
889 pci_remove_root_bus(zdev->bus);
890 }
891
892 int zpci_report_error(struct pci_dev *pdev,
893 struct zpci_report_error_header *report)
894 {
895 struct zpci_dev *zdev = to_zpci(pdev);
896
897 return sclp_pci_report(report, zdev->fh, zdev->fid);
898 }
899 EXPORT_SYMBOL(zpci_report_error);
900
901 static int zpci_mem_init(void)
902 {
903 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
904 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
905
906 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
907 __alignof__(struct zpci_fmb), 0, NULL);
908 if (!zdev_fmb_cache)
909 goto error_fmb;
910
911 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
912 sizeof(*zpci_iomap_start), GFP_KERNEL);
913 if (!zpci_iomap_start)
914 goto error_iomap;
915
916 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
917 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
918 if (!zpci_iomap_bitmap)
919 goto error_iomap_bitmap;
920
921 return 0;
922 error_iomap_bitmap:
923 kfree(zpci_iomap_start);
924 error_iomap:
925 kmem_cache_destroy(zdev_fmb_cache);
926 error_fmb:
927 return -ENOMEM;
928 }
929
930 static void zpci_mem_exit(void)
931 {
932 kfree(zpci_iomap_bitmap);
933 kfree(zpci_iomap_start);
934 kmem_cache_destroy(zdev_fmb_cache);
935 }
936
937 static unsigned int s390_pci_probe = 1;
938 static unsigned int s390_pci_initialized;
939
940 char * __init pcibios_setup(char *str)
941 {
942 if (!strcmp(str, "off")) {
943 s390_pci_probe = 0;
944 return NULL;
945 }
946 return str;
947 }
948
949 bool zpci_is_enabled(void)
950 {
951 return s390_pci_initialized;
952 }
953
954 static int __init pci_base_init(void)
955 {
956 int rc;
957
958 if (!s390_pci_probe)
959 return 0;
960
961 if (!test_facility(69) || !test_facility(71))
962 return 0;
963
964 rc = zpci_debug_init();
965 if (rc)
966 goto out;
967
968 rc = zpci_mem_init();
969 if (rc)
970 goto out_mem;
971
972 rc = zpci_irq_init();
973 if (rc)
974 goto out_irq;
975
976 rc = zpci_dma_init();
977 if (rc)
978 goto out_dma;
979
980 rc = clp_scan_pci_devices();
981 if (rc)
982 goto out_find;
983
984 s390_pci_initialized = 1;
985 return 0;
986
987 out_find:
988 zpci_dma_exit();
989 out_dma:
990 zpci_irq_exit();
991 out_irq:
992 zpci_mem_exit();
993 out_mem:
994 zpci_debug_exit();
995 out:
996 return rc;
997 }
998 subsys_initcall_sync(pci_base_init);
999
1000 void zpci_rescan(void)
1001 {
1002 if (zpci_is_enabled())
1003 clp_rescan_pci_devices_simple();
1004 }
Linux with added FPC-III support