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