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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
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
48static LIST_HEAD(zpci_list);
49static DEFINE_SPINLOCK(zpci_list_lock);
50
51static void zpci_enable_irq(struct irq_data *data);
52static void zpci_disable_irq(struct irq_data *data);
53
54static struct irq_chip zpci_irq_chip = {
55 .name = "zPCI",
56 .irq_unmask = zpci_enable_irq,
57 .irq_mask = zpci_disable_irq,
58};
59
60static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
61static DEFINE_SPINLOCK(zpci_domain_lock);
62
63static struct airq_iv *zpci_aisb_iv;
64static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];
65
66
67static void zpci_irq_handler(struct airq_struct *airq);
68
69static struct airq_struct zpci_airq = {
70 .handler = zpci_irq_handler,
71 .isc = PCI_ISC,
72};
73
74
75static DEFINE_SPINLOCK(zpci_iomap_lock);
76static DECLARE_BITMAP(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
77struct zpci_iomap_entry *zpci_iomap_start;
78EXPORT_SYMBOL_GPL(zpci_iomap_start);
79
80static struct kmem_cache *zdev_fmb_cache;
81
82struct zpci_dev *get_zdev(struct pci_dev *pdev)
83{
84 return (struct zpci_dev *) pdev->sysdata;
85}
86
87struct 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
102static 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
107int pci_domain_nr(struct pci_bus *bus)
108{
109 return ((struct zpci_dev *) bus->sysdata)->domain;
110}
111EXPORT_SYMBOL_GPL(pci_domain_nr);
112
113int pci_proc_domain(struct pci_bus *bus)
114{
115 return pci_domain_nr(bus);
116}
117EXPORT_SYMBOL_GPL(pci_proc_domain);
118
119
120static 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;
124 int rc;
125
126 fib = (void *) get_zeroed_page(GFP_KERNEL);
127 if (!fib)
128 return -ENOMEM;
129
130 fib->isc = PCI_ISC;
131 fib->sum = 1;
132 fib->noi = airq_iv_end(zdev->aibv);
133 fib->aibv = (unsigned long) zdev->aibv->vector;
134 fib->aibvo = 0;
135 fib->aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
136 fib->aisbo = zdev->aisb & 63;
137
138 rc = zpci_mod_fc(req, fib);
139 pr_debug("%s mpcifc returned noi: %d\n", __func__, fib->noi);
140
141 free_page((unsigned long) fib);
142 return rc;
143}
144
145struct mod_pci_args {
146 u64 base;
147 u64 limit;
148 u64 iota;
149 u64 fmb_addr;
150};
151
152static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
153{
154 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
155 struct zpci_fib *fib;
156 int rc;
157
158
159 fib = (void *) get_zeroed_page(GFP_KERNEL);
160 if (!fib)
161 return -ENOMEM;
162
163 fib->pba = args->base;
164 fib->pal = args->limit;
165 fib->iota = args->iota;
166 fib->fmb_addr = args->fmb_addr;
167
168 rc = zpci_mod_fc(req, fib);
169 free_page((unsigned long) fib);
170 return rc;
171}
172
173
174int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
175 u64 base, u64 limit, u64 iota)
176{
177 struct mod_pci_args args = { base, limit, iota, 0 };
178
179 WARN_ON_ONCE(iota & 0x3fff);
180 args.iota |= ZPCI_IOTA_RTTO_FLAG;
181 return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
182}
183
184
185int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
186{
187 struct mod_pci_args args = { 0, 0, 0, 0 };
188
189 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
190}
191
192
193static int zpci_clear_airq(struct zpci_dev *zdev)
194{
195 struct mod_pci_args args = { 0, 0, 0, 0 };
196
197 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args);
198}
199
200
201int zpci_fmb_enable_device(struct zpci_dev *zdev)
202{
203 struct mod_pci_args args = { 0, 0, 0, 0 };
204
205 if (zdev->fmb)
206 return -EINVAL;
207
208 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
209 if (!zdev->fmb)
210 return -ENOMEM;
211 WARN_ON((u64) zdev->fmb & 0xf);
212
213 args.fmb_addr = virt_to_phys(zdev->fmb);
214 return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
215}
216
217
218int zpci_fmb_disable_device(struct zpci_dev *zdev)
219{
220 struct mod_pci_args args = { 0, 0, 0, 0 };
221 int rc;
222
223 if (!zdev->fmb)
224 return -EINVAL;
225
226
227 rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
228
229 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
230 zdev->fmb = NULL;
231 return rc;
232}
233
234#define ZPCI_PCIAS_CFGSPC 15
235
236static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
237{
238 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
239 u64 data;
240 int rc;
241
242 rc = zpci_load(&data, req, offset);
243 if (!rc) {
244 data = data << ((8 - len) * 8);
245 data = le64_to_cpu(data);
246 *val = (u32) data;
247 } else
248 *val = 0xffffffff;
249 return rc;
250}
251
252static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
253{
254 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
255 u64 data = val;
256 int rc;
257
258 data = cpu_to_le64(data);
259 data = data >> ((8 - len) * 8);
260 rc = zpci_store(data, req, offset);
261 return rc;
262}
263
264static int zpci_msi_set_mask_bits(struct msi_desc *msi, u32 mask, u32 flag)
265{
266 int offset, pos;
267 u32 mask_bits;
268
269 if (msi->msi_attrib.is_msix) {
270 offset = msi->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
271 PCI_MSIX_ENTRY_VECTOR_CTRL;
272 msi->masked = readl(msi->mask_base + offset);
273 writel(flag, msi->mask_base + offset);
274 } else if (msi->msi_attrib.maskbit) {
275 pos = (long) msi->mask_base;
276 pci_read_config_dword(msi->dev, pos, &mask_bits);
277 mask_bits &= ~(mask);
278 mask_bits |= flag & mask;
279 pci_write_config_dword(msi->dev, pos, mask_bits);
280 } else
281 return 0;
282
283 msi->msi_attrib.maskbit = !!flag;
284 return 1;
285}
286
287static void zpci_enable_irq(struct irq_data *data)
288{
289 struct msi_desc *msi = irq_get_msi_desc(data->irq);
290
291 zpci_msi_set_mask_bits(msi, 1, 0);
292}
293
294static void zpci_disable_irq(struct irq_data *data)
295{
296 struct msi_desc *msi = irq_get_msi_desc(data->irq);
297
298 zpci_msi_set_mask_bits(msi, 1, 1);
299}
300
301void pcibios_fixup_bus(struct pci_bus *bus)
302{
303}
304
305resource_size_t pcibios_align_resource(void *data, const struct resource *res,
306 resource_size_t size,
307 resource_size_t align)
308{
309 return 0;
310}
311
312
313void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
314{
315 zpci_memcpy_toio(to, from, count);
316}
317
318
319void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max)
320{
321 struct zpci_dev *zdev = get_zdev(pdev);
322 u64 addr;
323 int idx;
324
325 if ((bar & 7) != bar)
326 return NULL;
327
328 idx = zdev->bars[bar].map_idx;
329 spin_lock(&zpci_iomap_lock);
330 zpci_iomap_start[idx].fh = zdev->fh;
331 zpci_iomap_start[idx].bar = bar;
332 spin_unlock(&zpci_iomap_lock);
333
334 addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48);
335 return (void __iomem *) addr;
336}
337EXPORT_SYMBOL_GPL(pci_iomap);
338
339void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
340{
341 unsigned int idx;
342
343 idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48;
344 spin_lock(&zpci_iomap_lock);
345 zpci_iomap_start[idx].fh = 0;
346 zpci_iomap_start[idx].bar = 0;
347 spin_unlock(&zpci_iomap_lock);
348}
349EXPORT_SYMBOL_GPL(pci_iounmap);
350
351static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
352 int size, u32 *val)
353{
354 struct zpci_dev *zdev = get_zdev_by_bus(bus);
355 int ret;
356
357 if (!zdev || devfn != ZPCI_DEVFN)
358 ret = -ENODEV;
359 else
360 ret = zpci_cfg_load(zdev, where, val, size);
361
362 return ret;
363}
364
365static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
366 int size, u32 val)
367{
368 struct zpci_dev *zdev = get_zdev_by_bus(bus);
369 int ret;
370
371 if (!zdev || devfn != ZPCI_DEVFN)
372 ret = -ENODEV;
373 else
374 ret = zpci_cfg_store(zdev, where, val, size);
375
376 return ret;
377}
378
379static struct pci_ops pci_root_ops = {
380 .read = pci_read,
381 .write = pci_write,
382};
383
384static void zpci_irq_handler(struct airq_struct *airq)
385{
386 unsigned long si, ai;
387 struct airq_iv *aibv;
388 int irqs_on = 0;
389
390 inc_irq_stat(IRQIO_PCI);
391 for (si = 0;;) {
392
393 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
394 if (si == -1UL) {
395 if (irqs_on++)
396
397 break;
398
399 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
400 si = 0;
401 continue;
402 }
403
404
405 aibv = zpci_aibv[si];
406 for (ai = 0;;) {
407 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
408 if (ai == -1UL)
409 break;
410 inc_irq_stat(IRQIO_MSI);
411 airq_iv_lock(aibv, ai);
412 generic_handle_irq(airq_iv_get_data(aibv, ai));
413 airq_iv_unlock(aibv, ai);
414 }
415 }
416}
417
418int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
419{
420 struct zpci_dev *zdev = get_zdev(pdev);
421 unsigned int hwirq, irq, msi_vecs;
422 unsigned long aisb;
423 struct msi_desc *msi;
424 struct msi_msg msg;
425 int rc;
426
427 pr_debug("%s: requesting %d MSI-X interrupts...", __func__, nvec);
428 if (type != PCI_CAP_ID_MSIX && type != PCI_CAP_ID_MSI)
429 return -EINVAL;
430 msi_vecs = min(nvec, ZPCI_MSI_VEC_MAX);
431 msi_vecs = min_t(unsigned int, msi_vecs, CONFIG_PCI_NR_MSI);
432
433
434 rc = -EIO;
435 aisb = airq_iv_alloc_bit(zpci_aisb_iv);
436 if (aisb == -1UL)
437 goto out;
438 zdev->aisb = aisb;
439
440
441 rc = -ENOMEM;
442 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
443 if (!zdev->aibv)
444 goto out_si;
445
446
447 zpci_aibv[aisb] = zdev->aibv;
448
449
450 hwirq = 0;
451 list_for_each_entry(msi, &pdev->msi_list, list) {
452 rc = -EIO;
453 irq = irq_alloc_desc(0);
454 if (irq == NO_IRQ)
455 goto out_msi;
456 rc = irq_set_msi_desc(irq, msi);
457 if (rc)
458 goto out_msi;
459 irq_set_chip_and_handler(irq, &zpci_irq_chip,
460 handle_simple_irq);
461 msg.data = hwirq;
462 msg.address_lo = zdev->msi_addr & 0xffffffff;
463 msg.address_hi = zdev->msi_addr >> 32;
464 write_msi_msg(irq, &msg);
465 airq_iv_set_data(zdev->aibv, hwirq, irq);
466 hwirq++;
467 }
468
469
470 rc = zpci_set_airq(zdev);
471 if (rc)
472 goto out_msi;
473
474 return (msi_vecs == nvec) ? 0 : msi_vecs;
475
476out_msi:
477 list_for_each_entry(msi, &pdev->msi_list, list) {
478 if (hwirq-- == 0)
479 break;
480 irq_set_msi_desc(msi->irq, NULL);
481 irq_free_desc(msi->irq);
482 msi->msg.address_lo = 0;
483 msi->msg.address_hi = 0;
484 msi->msg.data = 0;
485 msi->irq = 0;
486 }
487 zpci_aibv[aisb] = NULL;
488 airq_iv_release(zdev->aibv);
489out_si:
490 airq_iv_free_bit(zpci_aisb_iv, aisb);
491out:
492 dev_err(&pdev->dev, "register MSI failed with: %d\n", rc);
493 return rc;
494}
495
496void arch_teardown_msi_irqs(struct pci_dev *pdev)
497{
498 struct zpci_dev *zdev = get_zdev(pdev);
499 struct msi_desc *msi;
500 int rc;
501
502 pr_info("%s: on pdev: %p\n", __func__, pdev);
503
504
505 rc = zpci_clear_airq(zdev);
506 if (rc) {
507 dev_err(&pdev->dev, "deregister MSI failed with: %d\n", rc);
508 return;
509 }
510
511
512 list_for_each_entry(msi, &pdev->msi_list, list) {
513 zpci_msi_set_mask_bits(msi, 1, 1);
514 irq_set_msi_desc(msi->irq, NULL);
515 irq_free_desc(msi->irq);
516 msi->msg.address_lo = 0;
517 msi->msg.address_hi = 0;
518 msi->msg.data = 0;
519 msi->irq = 0;
520 }
521
522 zpci_aibv[zdev->aisb] = NULL;
523 airq_iv_release(zdev->aibv);
524 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
525}
526
527static void zpci_map_resources(struct zpci_dev *zdev)
528{
529 struct pci_dev *pdev = zdev->pdev;
530 resource_size_t len;
531 int i;
532
533 for (i = 0; i < PCI_BAR_COUNT; i++) {
534 len = pci_resource_len(pdev, i);
535 if (!len)
536 continue;
537 pdev->resource[i].start = (resource_size_t) pci_iomap(pdev, i, 0);
538 pdev->resource[i].end = pdev->resource[i].start + len - 1;
539 }
540}
541
542static void zpci_unmap_resources(struct zpci_dev *zdev)
543{
544 struct pci_dev *pdev = zdev->pdev;
545 resource_size_t len;
546 int i;
547
548 for (i = 0; i < PCI_BAR_COUNT; i++) {
549 len = pci_resource_len(pdev, i);
550 if (!len)
551 continue;
552 pci_iounmap(pdev, (void *) pdev->resource[i].start);
553 }
554}
555
556struct zpci_dev *zpci_alloc_device(void)
557{
558 struct zpci_dev *zdev;
559
560
561 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
562 return zdev ? : ERR_PTR(-ENOMEM);
563}
564
565void zpci_free_device(struct zpci_dev *zdev)
566{
567 kfree(zdev);
568}
569
570int pcibios_add_platform_entries(struct pci_dev *pdev)
571{
572 return zpci_sysfs_add_device(&pdev->dev);
573}
574
575static int __init zpci_irq_init(void)
576{
577 int rc;
578
579 rc = register_adapter_interrupt(&zpci_airq);
580 if (rc)
581 goto out;
582
583 *zpci_airq.lsi_ptr = 1;
584
585 rc = -ENOMEM;
586 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
587 if (!zpci_aisb_iv)
588 goto out_airq;
589
590 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
591 return 0;
592
593out_airq:
594 unregister_adapter_interrupt(&zpci_airq);
595out:
596 return rc;
597}
598
599static void zpci_irq_exit(void)
600{
601 airq_iv_release(zpci_aisb_iv);
602 unregister_adapter_interrupt(&zpci_airq);
603}
604
605static struct resource *zpci_alloc_bus_resource(unsigned long start, unsigned long size,
606 unsigned long flags, int domain)
607{
608 struct resource *r;
609 char *name;
610 int rc;
611
612 r = kzalloc(sizeof(*r), GFP_KERNEL);
613 if (!r)
614 return ERR_PTR(-ENOMEM);
615 r->start = start;
616 r->end = r->start + size - 1;
617 r->flags = flags;
618 r->parent = &iomem_resource;
619 name = kmalloc(18, GFP_KERNEL);
620 if (!name) {
621 kfree(r);
622 return ERR_PTR(-ENOMEM);
623 }
624 sprintf(name, "PCI Bus: %04x:%02x", domain, ZPCI_BUS_NR);
625 r->name = name;
626
627 rc = request_resource(&iomem_resource, r);
628 if (rc)
629 pr_debug("request resource %pR failed\n", r);
630 return r;
631}
632
633static int zpci_alloc_iomap(struct zpci_dev *zdev)
634{
635 int entry;
636
637 spin_lock(&zpci_iomap_lock);
638 entry = find_first_zero_bit(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
639 if (entry == ZPCI_IOMAP_MAX_ENTRIES) {
640 spin_unlock(&zpci_iomap_lock);
641 return -ENOSPC;
642 }
643 set_bit(entry, zpci_iomap);
644 spin_unlock(&zpci_iomap_lock);
645 return entry;
646}
647
648static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
649{
650 spin_lock(&zpci_iomap_lock);
651 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
652 clear_bit(entry, zpci_iomap);
653 spin_unlock(&zpci_iomap_lock);
654}
655
656int pcibios_add_device(struct pci_dev *pdev)
657{
658 struct zpci_dev *zdev = get_zdev(pdev);
659 struct resource *res;
660 int i;
661
662 zdev->pdev = pdev;
663 zpci_map_resources(zdev);
664
665 for (i = 0; i < PCI_BAR_COUNT; i++) {
666 res = &pdev->resource[i];
667 if (res->parent || !res->flags)
668 continue;
669 pci_claim_resource(pdev, i);
670 }
671
672 return 0;
673}
674
675int pcibios_enable_device(struct pci_dev *pdev, int mask)
676{
677 struct zpci_dev *zdev = get_zdev(pdev);
678 struct resource *res;
679 u16 cmd;
680 int i;
681
682 zdev->pdev = pdev;
683 zpci_debug_init_device(zdev);
684 zpci_fmb_enable_device(zdev);
685 zpci_map_resources(zdev);
686
687 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
688 for (i = 0; i < PCI_BAR_COUNT; i++) {
689 res = &pdev->resource[i];
690
691 if (res->flags & IORESOURCE_IO)
692 return -EINVAL;
693
694 if (res->flags & IORESOURCE_MEM)
695 cmd |= PCI_COMMAND_MEMORY;
696 }
697 pci_write_config_word(pdev, PCI_COMMAND, cmd);
698 return 0;
699}
700
701void pcibios_disable_device(struct pci_dev *pdev)
702{
703 struct zpci_dev *zdev = get_zdev(pdev);
704
705 zpci_unmap_resources(zdev);
706 zpci_fmb_disable_device(zdev);
707 zpci_debug_exit_device(zdev);
708 zdev->pdev = NULL;
709}
710
711static int zpci_scan_bus(struct zpci_dev *zdev)
712{
713 struct resource *res;
714 LIST_HEAD(resources);
715 int i;
716
717
718 for (i = 0; i < PCI_BAR_COUNT; i++) {
719 unsigned long addr, size, flags;
720 int entry;
721
722 if (!zdev->bars[i].size)
723 continue;
724 entry = zpci_alloc_iomap(zdev);
725 if (entry < 0)
726 return entry;
727 zdev->bars[i].map_idx = entry;
728
729
730 flags = IORESOURCE_MEM;
731 if (zdev->bars[i].val & 8)
732 flags |= IORESOURCE_PREFETCH;
733 if (zdev->bars[i].val & 4)
734 flags |= IORESOURCE_MEM_64;
735
736 addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48);
737
738 size = 1UL << zdev->bars[i].size;
739
740 res = zpci_alloc_bus_resource(addr, size, flags, zdev->domain);
741 if (IS_ERR(res)) {
742 zpci_free_iomap(zdev, entry);
743 return PTR_ERR(res);
744 }
745 pci_add_resource(&resources, res);
746 }
747
748 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
749 zdev, &resources);
750 if (!zdev->bus)
751 return -EIO;
752
753 zdev->bus->max_bus_speed = zdev->max_bus_speed;
754 return 0;
755}
756
757static int zpci_alloc_domain(struct zpci_dev *zdev)
758{
759 spin_lock(&zpci_domain_lock);
760 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
761 if (zdev->domain == ZPCI_NR_DEVICES) {
762 spin_unlock(&zpci_domain_lock);
763 return -ENOSPC;
764 }
765 set_bit(zdev->domain, zpci_domain);
766 spin_unlock(&zpci_domain_lock);
767 return 0;
768}
769
770static void zpci_free_domain(struct zpci_dev *zdev)
771{
772 spin_lock(&zpci_domain_lock);
773 clear_bit(zdev->domain, zpci_domain);
774 spin_unlock(&zpci_domain_lock);
775}
776
777int zpci_enable_device(struct zpci_dev *zdev)
778{
779 int rc;
780
781 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
782 if (rc)
783 goto out;
784 pr_info("Enabled fh: 0x%x fid: 0x%x\n", zdev->fh, zdev->fid);
785
786 rc = zpci_dma_init_device(zdev);
787 if (rc)
788 goto out_dma;
789
790 zdev->state = ZPCI_FN_STATE_ONLINE;
791 return 0;
792
793out_dma:
794 clp_disable_fh(zdev);
795out:
796 return rc;
797}
798EXPORT_SYMBOL_GPL(zpci_enable_device);
799
800int zpci_disable_device(struct zpci_dev *zdev)
801{
802 zpci_dma_exit_device(zdev);
803 return clp_disable_fh(zdev);
804}
805EXPORT_SYMBOL_GPL(zpci_disable_device);
806
807int zpci_create_device(struct zpci_dev *zdev)
808{
809 int rc;
810
811 rc = zpci_alloc_domain(zdev);
812 if (rc)
813 goto out;
814
815 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
816 rc = zpci_enable_device(zdev);
817 if (rc)
818 goto out_free;
819 }
820 rc = zpci_scan_bus(zdev);
821 if (rc)
822 goto out_disable;
823
824 spin_lock(&zpci_list_lock);
825 list_add_tail(&zdev->entry, &zpci_list);
826 spin_unlock(&zpci_list_lock);
827
828 zpci_init_slot(zdev);
829
830 return 0;
831
832out_disable:
833 if (zdev->state == ZPCI_FN_STATE_ONLINE)
834 zpci_disable_device(zdev);
835out_free:
836 zpci_free_domain(zdev);
837out:
838 return rc;
839}
840
841void zpci_stop_device(struct zpci_dev *zdev)
842{
843 zpci_dma_exit_device(zdev);
844
845
846
847
848}
849EXPORT_SYMBOL_GPL(zpci_stop_device);
850
851static inline int barsize(u8 size)
852{
853 return (size) ? (1 << size) >> 10 : 0;
854}
855
856static int zpci_mem_init(void)
857{
858 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
859 16, 0, NULL);
860 if (!zdev_fmb_cache)
861 goto error_zdev;
862
863
864 zpci_iomap_start = kzalloc(ZPCI_IOMAP_MAX_ENTRIES * sizeof(*zpci_iomap_start),
865 GFP_KERNEL);
866 if (!zpci_iomap_start)
867 goto error_iomap;
868 return 0;
869
870error_iomap:
871 kmem_cache_destroy(zdev_fmb_cache);
872error_zdev:
873 return -ENOMEM;
874}
875
876static void zpci_mem_exit(void)
877{
878 kfree(zpci_iomap_start);
879 kmem_cache_destroy(zdev_fmb_cache);
880}
881
882static unsigned int s390_pci_probe;
883
884char * __init pcibios_setup(char *str)
885{
886 if (!strcmp(str, "on")) {
887 s390_pci_probe = 1;
888 return NULL;
889 }
890 return str;
891}
892
893static int __init pci_base_init(void)
894{
895 int rc;
896
897 if (!s390_pci_probe)
898 return 0;
899
900 if (!test_facility(2) || !test_facility(69)
901 || !test_facility(71) || !test_facility(72))
902 return 0;
903
904 pr_info("Probing PCI hardware: PCI:%d SID:%d AEN:%d\n",
905 test_facility(69), test_facility(70),
906 test_facility(71));
907
908 rc = zpci_debug_init();
909 if (rc)
910 goto out;
911
912 rc = zpci_mem_init();
913 if (rc)
914 goto out_mem;
915
916 rc = zpci_irq_init();
917 if (rc)
918 goto out_irq;
919
920 rc = zpci_dma_init();
921 if (rc)
922 goto out_dma;
923
924 rc = clp_scan_pci_devices();
925 if (rc)
926 goto out_find;
927
928 return 0;
929
930out_find:
931 zpci_dma_exit();
932out_dma:
933 zpci_irq_exit();
934out_irq:
935 zpci_mem_exit();
936out_mem:
937 zpci_debug_exit();
938out:
939 return rc;
940}
941subsys_initcall_sync(pci_base_init);
942
943void zpci_rescan(void)
944{
945 clp_rescan_pci_devices_simple();
946}
947