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30de42730b2f20096890cf4022023a4f1b292884
[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 COMPONENT "zPCI"
19 #define pr_fmt(fmt) 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 = unmask_msi_irq,
54 .irq_mask = mask_msi_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(struct pci_dev *pdev, int bar, unsigned long max)
263 {
264 struct zpci_dev *zdev = get_zdev(pdev);
265 u64 addr;
266 int idx;
267
268 if ((bar & 7) != bar)
269 return NULL;
270
271 idx = zdev->bars[bar].map_idx;
272 spin_lock(&zpci_iomap_lock);
273 zpci_iomap_start[idx].fh = zdev->fh;
274 zpci_iomap_start[idx].bar = bar;
275 spin_unlock(&zpci_iomap_lock);
276
277 addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48);
278 return (void __iomem *) addr;
279 }
280 EXPORT_SYMBOL_GPL(pci_iomap);
281
282 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
283 {
284 unsigned int idx;
285
286 idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48;
287 spin_lock(&zpci_iomap_lock);
288 zpci_iomap_start[idx].fh = 0;
289 zpci_iomap_start[idx].bar = 0;
290 spin_unlock(&zpci_iomap_lock);
291 }
292 EXPORT_SYMBOL_GPL(pci_iounmap);
293
294 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
295 int size, u32 *val)
296 {
297 struct zpci_dev *zdev = get_zdev_by_bus(bus);
298 int ret;
299
300 if (!zdev || devfn != ZPCI_DEVFN)
301 ret = -ENODEV;
302 else
303 ret = zpci_cfg_load(zdev, where, val, size);
304
305 return ret;
306 }
307
308 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
309 int size, u32 val)
310 {
311 struct zpci_dev *zdev = get_zdev_by_bus(bus);
312 int ret;
313
314 if (!zdev || devfn != ZPCI_DEVFN)
315 ret = -ENODEV;
316 else
317 ret = zpci_cfg_store(zdev, where, val, size);
318
319 return ret;
320 }
321
322 static struct pci_ops pci_root_ops = {
323 .read = pci_read,
324 .write = pci_write,
325 };
326
327 static void zpci_irq_handler(struct airq_struct *airq)
328 {
329 unsigned long si, ai;
330 struct airq_iv *aibv;
331 int irqs_on = 0;
332
333 inc_irq_stat(IRQIO_PCI);
334 for (si = 0;;) {
335 /* Scan adapter summary indicator bit vector */
336 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
337 if (si == -1UL) {
338 if (irqs_on++)
339 /* End of second scan with interrupts on. */
340 break;
341 /* First scan complete, reenable interrupts. */
342 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
343 si = 0;
344 continue;
345 }
346
347 /* Scan the adapter interrupt vector for this device. */
348 aibv = zpci_aibv[si];
349 for (ai = 0;;) {
350 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
351 if (ai == -1UL)
352 break;
353 inc_irq_stat(IRQIO_MSI);
354 airq_iv_lock(aibv, ai);
355 generic_handle_irq(airq_iv_get_data(aibv, ai));
356 airq_iv_unlock(aibv, ai);
357 }
358 }
359 }
360
361 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
362 {
363 struct zpci_dev *zdev = get_zdev(pdev);
364 unsigned int hwirq, msi_vecs;
365 unsigned long aisb;
366 struct msi_desc *msi;
367 struct msi_msg msg;
368 int rc, irq;
369
370 if (type == PCI_CAP_ID_MSI && nvec > 1)
371 return 1;
372 msi_vecs = min(nvec, ZPCI_MSI_VEC_MAX);
373 msi_vecs = min_t(unsigned int, msi_vecs, CONFIG_PCI_NR_MSI);
374
375 /* Allocate adapter summary indicator bit */
376 rc = -EIO;
377 aisb = airq_iv_alloc_bit(zpci_aisb_iv);
378 if (aisb == -1UL)
379 goto out;
380 zdev->aisb = aisb;
381
382 /* Create adapter interrupt vector */
383 rc = -ENOMEM;
384 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
385 if (!zdev->aibv)
386 goto out_si;
387
388 /* Wire up shortcut pointer */
389 zpci_aibv[aisb] = zdev->aibv;
390
391 /* Request MSI interrupts */
392 hwirq = 0;
393 list_for_each_entry(msi, &pdev->msi_list, list) {
394 rc = -EIO;
395 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */
396 if (irq < 0)
397 goto out_msi;
398 rc = irq_set_msi_desc(irq, msi);
399 if (rc)
400 goto out_msi;
401 irq_set_chip_and_handler(irq, &zpci_irq_chip,
402 handle_simple_irq);
403 msg.data = hwirq;
404 msg.address_lo = zdev->msi_addr & 0xffffffff;
405 msg.address_hi = zdev->msi_addr >> 32;
406 write_msi_msg(irq, &msg);
407 airq_iv_set_data(zdev->aibv, hwirq, irq);
408 hwirq++;
409 }
410
411 /* Enable adapter interrupts */
412 rc = zpci_set_airq(zdev);
413 if (rc)
414 goto out_msi;
415
416 return (msi_vecs == nvec) ? 0 : msi_vecs;
417
418 out_msi:
419 list_for_each_entry(msi, &pdev->msi_list, list) {
420 if (hwirq-- == 0)
421 break;
422 irq_set_msi_desc(msi->irq, NULL);
423 irq_free_desc(msi->irq);
424 msi->msg.address_lo = 0;
425 msi->msg.address_hi = 0;
426 msi->msg.data = 0;
427 msi->irq = 0;
428 }
429 zpci_aibv[aisb] = NULL;
430 airq_iv_release(zdev->aibv);
431 out_si:
432 airq_iv_free_bit(zpci_aisb_iv, aisb);
433 out:
434 return rc;
435 }
436
437 void arch_teardown_msi_irqs(struct pci_dev *pdev)
438 {
439 struct zpci_dev *zdev = get_zdev(pdev);
440 struct msi_desc *msi;
441 int rc;
442
443 /* Disable adapter interrupts */
444 rc = zpci_clear_airq(zdev);
445 if (rc)
446 return;
447
448 /* Release MSI interrupts */
449 list_for_each_entry(msi, &pdev->msi_list, list) {
450 if (msi->msi_attrib.is_msix)
451 default_msix_mask_irq(msi, 1);
452 else
453 default_msi_mask_irq(msi, 1, 1);
454 irq_set_msi_desc(msi->irq, NULL);
455 irq_free_desc(msi->irq);
456 msi->msg.address_lo = 0;
457 msi->msg.address_hi = 0;
458 msi->msg.data = 0;
459 msi->irq = 0;
460 }
461
462 zpci_aibv[zdev->aisb] = NULL;
463 airq_iv_release(zdev->aibv);
464 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
465 }
466
467 static void zpci_map_resources(struct zpci_dev *zdev)
468 {
469 struct pci_dev *pdev = zdev->pdev;
470 resource_size_t len;
471 int i;
472
473 for (i = 0; i < PCI_BAR_COUNT; i++) {
474 len = pci_resource_len(pdev, i);
475 if (!len)
476 continue;
477 pdev->resource[i].start = (resource_size_t) pci_iomap(pdev, i, 0);
478 pdev->resource[i].end = pdev->resource[i].start + len - 1;
479 }
480 }
481
482 static void zpci_unmap_resources(struct zpci_dev *zdev)
483 {
484 struct pci_dev *pdev = zdev->pdev;
485 resource_size_t len;
486 int i;
487
488 for (i = 0; i < PCI_BAR_COUNT; i++) {
489 len = pci_resource_len(pdev, i);
490 if (!len)
491 continue;
492 pci_iounmap(pdev, (void *) pdev->resource[i].start);
493 }
494 }
495
496 static int __init zpci_irq_init(void)
497 {
498 int rc;
499
500 rc = register_adapter_interrupt(&zpci_airq);
501 if (rc)
502 goto out;
503 /* Set summary to 1 to be called every time for the ISC. */
504 *zpci_airq.lsi_ptr = 1;
505
506 rc = -ENOMEM;
507 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
508 if (!zpci_aisb_iv)
509 goto out_airq;
510
511 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
512 return 0;
513
514 out_airq:
515 unregister_adapter_interrupt(&zpci_airq);
516 out:
517 return rc;
518 }
519
520 static void zpci_irq_exit(void)
521 {
522 airq_iv_release(zpci_aisb_iv);
523 unregister_adapter_interrupt(&zpci_airq);
524 }
525
526 static int zpci_alloc_iomap(struct zpci_dev *zdev)
527 {
528 int entry;
529
530 spin_lock(&zpci_iomap_lock);
531 entry = find_first_zero_bit(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
532 if (entry == ZPCI_IOMAP_MAX_ENTRIES) {
533 spin_unlock(&zpci_iomap_lock);
534 return -ENOSPC;
535 }
536 set_bit(entry, zpci_iomap);
537 spin_unlock(&zpci_iomap_lock);
538 return entry;
539 }
540
541 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
542 {
543 spin_lock(&zpci_iomap_lock);
544 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
545 clear_bit(entry, zpci_iomap);
546 spin_unlock(&zpci_iomap_lock);
547 }
548
549 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
550 unsigned long size, unsigned long flags)
551 {
552 struct resource *r;
553
554 r = kzalloc(sizeof(*r), GFP_KERNEL);
555 if (!r)
556 return NULL;
557
558 r->start = start;
559 r->end = r->start + size - 1;
560 r->flags = flags;
561 r->name = zdev->res_name;
562
563 if (request_resource(&iomem_resource, r)) {
564 kfree(r);
565 return NULL;
566 }
567 return r;
568 }
569
570 static int zpci_setup_bus_resources(struct zpci_dev *zdev,
571 struct list_head *resources)
572 {
573 unsigned long addr, size, flags;
574 struct resource *res;
575 int i, entry;
576
577 snprintf(zdev->res_name, sizeof(zdev->res_name),
578 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
579
580 for (i = 0; i < PCI_BAR_COUNT; i++) {
581 if (!zdev->bars[i].size)
582 continue;
583 entry = zpci_alloc_iomap(zdev);
584 if (entry < 0)
585 return entry;
586 zdev->bars[i].map_idx = entry;
587
588 /* only MMIO is supported */
589 flags = IORESOURCE_MEM;
590 if (zdev->bars[i].val & 8)
591 flags |= IORESOURCE_PREFETCH;
592 if (zdev->bars[i].val & 4)
593 flags |= IORESOURCE_MEM_64;
594
595 addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48);
596
597 size = 1UL << zdev->bars[i].size;
598
599 res = __alloc_res(zdev, addr, size, flags);
600 if (!res) {
601 zpci_free_iomap(zdev, entry);
602 return -ENOMEM;
603 }
604 zdev->bars[i].res = res;
605 pci_add_resource(resources, res);
606 }
607
608 return 0;
609 }
610
611 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
612 {
613 int i;
614
615 for (i = 0; i < PCI_BAR_COUNT; i++) {
616 if (!zdev->bars[i].size)
617 continue;
618
619 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
620 release_resource(zdev->bars[i].res);
621 kfree(zdev->bars[i].res);
622 }
623 }
624
625 int pcibios_add_device(struct pci_dev *pdev)
626 {
627 struct zpci_dev *zdev = get_zdev(pdev);
628 struct resource *res;
629 int i;
630
631 zdev->pdev = pdev;
632 pdev->dev.groups = zpci_attr_groups;
633 zpci_map_resources(zdev);
634
635 for (i = 0; i < PCI_BAR_COUNT; i++) {
636 res = &pdev->resource[i];
637 if (res->parent || !res->flags)
638 continue;
639 pci_claim_resource(pdev, i);
640 }
641
642 return 0;
643 }
644
645 int pcibios_enable_device(struct pci_dev *pdev, int mask)
646 {
647 struct zpci_dev *zdev = get_zdev(pdev);
648
649 zdev->pdev = pdev;
650 zpci_debug_init_device(zdev);
651 zpci_fmb_enable_device(zdev);
652 zpci_map_resources(zdev);
653
654 return pci_enable_resources(pdev, mask);
655 }
656
657 void pcibios_disable_device(struct pci_dev *pdev)
658 {
659 struct zpci_dev *zdev = get_zdev(pdev);
660
661 zpci_unmap_resources(zdev);
662 zpci_fmb_disable_device(zdev);
663 zpci_debug_exit_device(zdev);
664 zdev->pdev = NULL;
665 }
666
667 #ifdef CONFIG_HIBERNATE_CALLBACKS
668 static int zpci_restore(struct device *dev)
669 {
670 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
671 int ret = 0;
672
673 if (zdev->state != ZPCI_FN_STATE_ONLINE)
674 goto out;
675
676 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
677 if (ret)
678 goto out;
679
680 zpci_map_resources(zdev);
681 zpci_register_ioat(zdev, 0, zdev->start_dma + PAGE_OFFSET,
682 zdev->start_dma + zdev->iommu_size - 1,
683 (u64) zdev->dma_table);
684
685 out:
686 return ret;
687 }
688
689 static int zpci_freeze(struct device *dev)
690 {
691 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
692
693 if (zdev->state != ZPCI_FN_STATE_ONLINE)
694 return 0;
695
696 zpci_unregister_ioat(zdev, 0);
697 return clp_disable_fh(zdev);
698 }
699
700 struct dev_pm_ops pcibios_pm_ops = {
701 .thaw_noirq = zpci_restore,
702 .freeze_noirq = zpci_freeze,
703 .restore_noirq = zpci_restore,
704 .poweroff_noirq = zpci_freeze,
705 };
706 #endif /* CONFIG_HIBERNATE_CALLBACKS */
707
708 static int zpci_alloc_domain(struct zpci_dev *zdev)
709 {
710 spin_lock(&zpci_domain_lock);
711 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
712 if (zdev->domain == ZPCI_NR_DEVICES) {
713 spin_unlock(&zpci_domain_lock);
714 return -ENOSPC;
715 }
716 set_bit(zdev->domain, zpci_domain);
717 spin_unlock(&zpci_domain_lock);
718 return 0;
719 }
720
721 static void zpci_free_domain(struct zpci_dev *zdev)
722 {
723 spin_lock(&zpci_domain_lock);
724 clear_bit(zdev->domain, zpci_domain);
725 spin_unlock(&zpci_domain_lock);
726 }
727
728 void pcibios_remove_bus(struct pci_bus *bus)
729 {
730 struct zpci_dev *zdev = get_zdev_by_bus(bus);
731
732 zpci_exit_slot(zdev);
733 zpci_cleanup_bus_resources(zdev);
734 zpci_free_domain(zdev);
735
736 spin_lock(&zpci_list_lock);
737 list_del(&zdev->entry);
738 spin_unlock(&zpci_list_lock);
739
740 kfree(zdev);
741 }
742
743 static int zpci_scan_bus(struct zpci_dev *zdev)
744 {
745 LIST_HEAD(resources);
746 int ret;
747
748 ret = zpci_setup_bus_resources(zdev, &resources);
749 if (ret)
750 return ret;
751
752 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
753 zdev, &resources);
754 if (!zdev->bus) {
755 zpci_cleanup_bus_resources(zdev);
756 return -EIO;
757 }
758
759 zdev->bus->max_bus_speed = zdev->max_bus_speed;
760 return 0;
761 }
762
763 int zpci_enable_device(struct zpci_dev *zdev)
764 {
765 int rc;
766
767 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
768 if (rc)
769 goto out;
770
771 rc = zpci_dma_init_device(zdev);
772 if (rc)
773 goto out_dma;
774
775 zdev->state = ZPCI_FN_STATE_ONLINE;
776 return 0;
777
778 out_dma:
779 clp_disable_fh(zdev);
780 out:
781 return rc;
782 }
783 EXPORT_SYMBOL_GPL(zpci_enable_device);
784
785 int zpci_disable_device(struct zpci_dev *zdev)
786 {
787 zpci_dma_exit_device(zdev);
788 return clp_disable_fh(zdev);
789 }
790 EXPORT_SYMBOL_GPL(zpci_disable_device);
791
792 int zpci_create_device(struct zpci_dev *zdev)
793 {
794 int rc;
795
796 rc = zpci_alloc_domain(zdev);
797 if (rc)
798 goto out;
799
800 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
801 rc = zpci_enable_device(zdev);
802 if (rc)
803 goto out_free;
804 }
805 rc = zpci_scan_bus(zdev);
806 if (rc)
807 goto out_disable;
808
809 spin_lock(&zpci_list_lock);
810 list_add_tail(&zdev->entry, &zpci_list);
811 spin_unlock(&zpci_list_lock);
812
813 zpci_init_slot(zdev);
814
815 return 0;
816
817 out_disable:
818 if (zdev->state == ZPCI_FN_STATE_ONLINE)
819 zpci_disable_device(zdev);
820 out_free:
821 zpci_free_domain(zdev);
822 out:
823 return rc;
824 }
825
826 void zpci_stop_device(struct zpci_dev *zdev)
827 {
828 zpci_dma_exit_device(zdev);
829 /*
830 * Note: SCLP disables fh via set-pci-fn so don't
831 * do that here.
832 */
833 }
834 EXPORT_SYMBOL_GPL(zpci_stop_device);
835
836 static inline int barsize(u8 size)
837 {
838 return (size) ? (1 << size) >> 10 : 0;
839 }
840
841 static int zpci_mem_init(void)
842 {
843 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
844 16, 0, NULL);
845 if (!zdev_fmb_cache)
846 goto error_zdev;
847
848 /* TODO: use realloc */
849 zpci_iomap_start = kzalloc(ZPCI_IOMAP_MAX_ENTRIES * sizeof(*zpci_iomap_start),
850 GFP_KERNEL);
851 if (!zpci_iomap_start)
852 goto error_iomap;
853 return 0;
854
855 error_iomap:
856 kmem_cache_destroy(zdev_fmb_cache);
857 error_zdev:
858 return -ENOMEM;
859 }
860
861 static void zpci_mem_exit(void)
862 {
863 kfree(zpci_iomap_start);
864 kmem_cache_destroy(zdev_fmb_cache);
865 }
866
867 static unsigned int s390_pci_probe = 1;
868 static unsigned int s390_pci_initialized;
869
870 char * __init pcibios_setup(char *str)
871 {
872 if (!strcmp(str, "off")) {
873 s390_pci_probe = 0;
874 return NULL;
875 }
876 return str;
877 }
878
879 bool zpci_is_enabled(void)
880 {
881 return s390_pci_initialized;
882 }
883
884 static int __init pci_base_init(void)
885 {
886 int rc;
887
888 if (!s390_pci_probe)
889 return 0;
890
891 if (!test_facility(2) || !test_facility(69)
892 || !test_facility(71) || !test_facility(72))
893 return 0;
894
895 rc = zpci_debug_init();
896 if (rc)
897 goto out;
898
899 rc = zpci_mem_init();
900 if (rc)
901 goto out_mem;
902
903 rc = zpci_irq_init();
904 if (rc)
905 goto out_irq;
906
907 rc = zpci_dma_init();
908 if (rc)
909 goto out_dma;
910
911 rc = clp_scan_pci_devices();
912 if (rc)
913 goto out_find;
914
915 s390_pci_initialized = 1;
916 return 0;
917
918 out_find:
919 zpci_dma_exit();
920 out_dma:
921 zpci_irq_exit();
922 out_irq:
923 zpci_mem_exit();
924 out_mem:
925 zpci_debug_exit();
926 out:
927 return rc;
928 }
929 subsys_initcall_sync(pci_base_init);
930
931 void zpci_rescan(void)
932 {
933 if (zpci_is_enabled())
934 clp_rescan_pci_devices_simple();
935 }
Linux kernel - Deliverables
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