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