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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/seq_file.h>
28#include <linux/jump_label.h>
29#include <linux/pci.h>
30#include <linux/printk.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#include "pci_bus.h"
40#include "pci_iov.h"
41
42/* list of all detected zpci devices */
43static LIST_HEAD(zpci_list);
44static DEFINE_SPINLOCK(zpci_list_lock);
45
46static DECLARE_BITMAP(zpci_domain, ZPCI_DOMAIN_BITMAP_SIZE);
47static DEFINE_SPINLOCK(zpci_domain_lock);
48
49#define ZPCI_IOMAP_ENTRIES \
50 min(((unsigned long) ZPCI_NR_DEVICES * PCI_STD_NUM_BARS / 2), \
51 ZPCI_IOMAP_MAX_ENTRIES)
52
53unsigned int s390_pci_no_rid;
54
55static DEFINE_SPINLOCK(zpci_iomap_lock);
56static unsigned long *zpci_iomap_bitmap;
57struct zpci_iomap_entry *zpci_iomap_start;
58EXPORT_SYMBOL_GPL(zpci_iomap_start);
59
60DEFINE_STATIC_KEY_FALSE(have_mio);
61
62static struct kmem_cache *zdev_fmb_cache;
63
64/* AEN structures that must be preserved over KVM module re-insertion */
65union zpci_sic_iib *zpci_aipb;
66EXPORT_SYMBOL_GPL(zpci_aipb);
67struct airq_iv *zpci_aif_sbv;
68EXPORT_SYMBOL_GPL(zpci_aif_sbv);
69
70struct zpci_dev *get_zdev_by_fid(u32 fid)
71{
72 struct zpci_dev *tmp, *zdev = NULL;
73
74 spin_lock(&zpci_list_lock);
75 list_for_each_entry(tmp, &zpci_list, entry) {
76 if (tmp->fid == fid) {
77 zdev = tmp;
78 zpci_zdev_get(zdev);
79 break;
80 }
81 }
82 spin_unlock(&zpci_list_lock);
83 return zdev;
84}
85
86void zpci_remove_reserved_devices(void)
87{
88 struct zpci_dev *tmp, *zdev;
89 enum zpci_state state;
90 LIST_HEAD(remove);
91
92 spin_lock(&zpci_list_lock);
93 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
94 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
95 !clp_get_state(zdev->fid, &state) &&
96 state == ZPCI_FN_STATE_RESERVED)
97 list_move_tail(&zdev->entry, &remove);
98 }
99 spin_unlock(&zpci_list_lock);
100
101 list_for_each_entry_safe(zdev, tmp, &remove, entry)
102 zpci_device_reserved(zdev);
103}
104
105int pci_domain_nr(struct pci_bus *bus)
106{
107 return ((struct zpci_bus *) bus->sysdata)->domain_nr;
108}
109EXPORT_SYMBOL_GPL(pci_domain_nr);
110
111int pci_proc_domain(struct pci_bus *bus)
112{
113 return pci_domain_nr(bus);
114}
115EXPORT_SYMBOL_GPL(pci_proc_domain);
116
117/* Modify PCI: Register I/O address translation parameters */
118int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
119 u64 base, u64 limit, u64 iota, u8 *status)
120{
121 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
122 struct zpci_fib fib = {0};
123 u8 cc;
124
125 WARN_ON_ONCE(iota & 0x3fff);
126 fib.pba = base;
127 fib.pal = limit;
128 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
129 fib.gd = zdev->gisa;
130 cc = zpci_mod_fc(req, &fib, status);
131 if (cc)
132 zpci_dbg(3, "reg ioat fid:%x, cc:%d, status:%d\n", zdev->fid, cc, *status);
133 return cc;
134}
135EXPORT_SYMBOL_GPL(zpci_register_ioat);
136
137/* Modify PCI: Unregister I/O address translation parameters */
138int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
139{
140 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
141 struct zpci_fib fib = {0};
142 u8 cc, status;
143
144 fib.gd = zdev->gisa;
145
146 cc = zpci_mod_fc(req, &fib, &status);
147 if (cc)
148 zpci_dbg(3, "unreg ioat fid:%x, cc:%d, status:%d\n", zdev->fid, cc, status);
149 return cc;
150}
151
152/* Modify PCI: Set PCI function measurement parameters */
153int zpci_fmb_enable_device(struct zpci_dev *zdev)
154{
155 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
156 struct zpci_fib fib = {0};
157 u8 cc, status;
158
159 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
160 return -EINVAL;
161
162 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
163 if (!zdev->fmb)
164 return -ENOMEM;
165 WARN_ON((u64) zdev->fmb & 0xf);
166
167 /* reset software counters */
168 atomic64_set(&zdev->allocated_pages, 0);
169 atomic64_set(&zdev->mapped_pages, 0);
170 atomic64_set(&zdev->unmapped_pages, 0);
171
172 fib.fmb_addr = virt_to_phys(zdev->fmb);
173 fib.gd = zdev->gisa;
174 cc = zpci_mod_fc(req, &fib, &status);
175 if (cc) {
176 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
177 zdev->fmb = NULL;
178 }
179 return cc ? -EIO : 0;
180}
181
182/* Modify PCI: Disable PCI function measurement */
183int zpci_fmb_disable_device(struct zpci_dev *zdev)
184{
185 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
186 struct zpci_fib fib = {0};
187 u8 cc, status;
188
189 if (!zdev->fmb)
190 return -EINVAL;
191
192 fib.gd = zdev->gisa;
193
194 /* Function measurement is disabled if fmb address is zero */
195 cc = zpci_mod_fc(req, &fib, &status);
196 if (cc == 3) /* Function already gone. */
197 cc = 0;
198
199 if (!cc) {
200 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
201 zdev->fmb = NULL;
202 }
203 return cc ? -EIO : 0;
204}
205
206static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
207{
208 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
209 u64 data;
210 int rc;
211
212 rc = __zpci_load(&data, req, offset);
213 if (!rc) {
214 data = le64_to_cpu((__force __le64) data);
215 data >>= (8 - len) * 8;
216 *val = (u32) data;
217 } else
218 *val = 0xffffffff;
219 return rc;
220}
221
222static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
223{
224 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
225 u64 data = val;
226 int rc;
227
228 data <<= (8 - len) * 8;
229 data = (__force u64) cpu_to_le64(data);
230 rc = __zpci_store(data, req, offset);
231 return rc;
232}
233
234resource_size_t pcibios_align_resource(void *data, const struct resource *res,
235 resource_size_t size,
236 resource_size_t align)
237{
238 return 0;
239}
240
241/* combine single writes by using store-block insn */
242void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
243{
244 zpci_memcpy_toio(to, from, count);
245}
246
247static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot)
248{
249 unsigned long offset, vaddr;
250 struct vm_struct *area;
251 phys_addr_t last_addr;
252
253 last_addr = addr + size - 1;
254 if (!size || last_addr < addr)
255 return NULL;
256
257 if (!static_branch_unlikely(&have_mio))
258 return (void __iomem *) addr;
259
260 offset = addr & ~PAGE_MASK;
261 addr &= PAGE_MASK;
262 size = PAGE_ALIGN(size + offset);
263 area = get_vm_area(size, VM_IOREMAP);
264 if (!area)
265 return NULL;
266
267 vaddr = (unsigned long) area->addr;
268 if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
269 free_vm_area(area);
270 return NULL;
271 }
272 return (void __iomem *) ((unsigned long) area->addr + offset);
273}
274
275void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
276{
277 return __ioremap(addr, size, __pgprot(prot));
278}
279EXPORT_SYMBOL(ioremap_prot);
280
281void __iomem *ioremap(phys_addr_t addr, size_t size)
282{
283 return __ioremap(addr, size, PAGE_KERNEL);
284}
285EXPORT_SYMBOL(ioremap);
286
287void __iomem *ioremap_wc(phys_addr_t addr, size_t size)
288{
289 return __ioremap(addr, size, pgprot_writecombine(PAGE_KERNEL));
290}
291EXPORT_SYMBOL(ioremap_wc);
292
293void __iomem *ioremap_wt(phys_addr_t addr, size_t size)
294{
295 return __ioremap(addr, size, pgprot_writethrough(PAGE_KERNEL));
296}
297EXPORT_SYMBOL(ioremap_wt);
298
299void iounmap(volatile void __iomem *addr)
300{
301 if (static_branch_likely(&have_mio))
302 vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
303}
304EXPORT_SYMBOL(iounmap);
305
306/* Create a virtual mapping cookie for a PCI BAR */
307static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
308 unsigned long offset, unsigned long max)
309{
310 struct zpci_dev *zdev = to_zpci(pdev);
311 int idx;
312
313 idx = zdev->bars[bar].map_idx;
314 spin_lock(&zpci_iomap_lock);
315 /* Detect overrun */
316 WARN_ON(!++zpci_iomap_start[idx].count);
317 zpci_iomap_start[idx].fh = zdev->fh;
318 zpci_iomap_start[idx].bar = bar;
319 spin_unlock(&zpci_iomap_lock);
320
321 return (void __iomem *) ZPCI_ADDR(idx) + offset;
322}
323
324static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
325 unsigned long offset,
326 unsigned long max)
327{
328 unsigned long barsize = pci_resource_len(pdev, bar);
329 struct zpci_dev *zdev = to_zpci(pdev);
330 void __iomem *iova;
331
332 iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
333 return iova ? iova + offset : iova;
334}
335
336void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
337 unsigned long offset, unsigned long max)
338{
339 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
340 return NULL;
341
342 if (static_branch_likely(&have_mio))
343 return pci_iomap_range_mio(pdev, bar, offset, max);
344 else
345 return pci_iomap_range_fh(pdev, bar, offset, max);
346}
347EXPORT_SYMBOL(pci_iomap_range);
348
349void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
350{
351 return pci_iomap_range(dev, bar, 0, maxlen);
352}
353EXPORT_SYMBOL(pci_iomap);
354
355static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
356 unsigned long offset, unsigned long max)
357{
358 unsigned long barsize = pci_resource_len(pdev, bar);
359 struct zpci_dev *zdev = to_zpci(pdev);
360 void __iomem *iova;
361
362 iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
363 return iova ? iova + offset : iova;
364}
365
366void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
367 unsigned long offset, unsigned long max)
368{
369 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
370 return NULL;
371
372 if (static_branch_likely(&have_mio))
373 return pci_iomap_wc_range_mio(pdev, bar, offset, max);
374 else
375 return pci_iomap_range_fh(pdev, bar, offset, max);
376}
377EXPORT_SYMBOL(pci_iomap_wc_range);
378
379void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
380{
381 return pci_iomap_wc_range(dev, bar, 0, maxlen);
382}
383EXPORT_SYMBOL(pci_iomap_wc);
384
385static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
386{
387 unsigned int idx = ZPCI_IDX(addr);
388
389 spin_lock(&zpci_iomap_lock);
390 /* Detect underrun */
391 WARN_ON(!zpci_iomap_start[idx].count);
392 if (!--zpci_iomap_start[idx].count) {
393 zpci_iomap_start[idx].fh = 0;
394 zpci_iomap_start[idx].bar = 0;
395 }
396 spin_unlock(&zpci_iomap_lock);
397}
398
399static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
400{
401 iounmap(addr);
402}
403
404void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
405{
406 if (static_branch_likely(&have_mio))
407 pci_iounmap_mio(pdev, addr);
408 else
409 pci_iounmap_fh(pdev, addr);
410}
411EXPORT_SYMBOL(pci_iounmap);
412
413static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
414 int size, u32 *val)
415{
416 struct zpci_dev *zdev = zdev_from_bus(bus, devfn);
417
418 return (zdev) ? zpci_cfg_load(zdev, where, val, size) : -ENODEV;
419}
420
421static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
422 int size, u32 val)
423{
424 struct zpci_dev *zdev = zdev_from_bus(bus, devfn);
425
426 return (zdev) ? zpci_cfg_store(zdev, where, val, size) : -ENODEV;
427}
428
429static struct pci_ops pci_root_ops = {
430 .read = pci_read,
431 .write = pci_write,
432};
433
434static void zpci_map_resources(struct pci_dev *pdev)
435{
436 struct zpci_dev *zdev = to_zpci(pdev);
437 resource_size_t len;
438 int i;
439
440 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
441 len = pci_resource_len(pdev, i);
442 if (!len)
443 continue;
444
445 if (zpci_use_mio(zdev))
446 pdev->resource[i].start =
447 (resource_size_t __force) zdev->bars[i].mio_wt;
448 else
449 pdev->resource[i].start = (resource_size_t __force)
450 pci_iomap_range_fh(pdev, i, 0, 0);
451 pdev->resource[i].end = pdev->resource[i].start + len - 1;
452 }
453
454 zpci_iov_map_resources(pdev);
455}
456
457static void zpci_unmap_resources(struct pci_dev *pdev)
458{
459 struct zpci_dev *zdev = to_zpci(pdev);
460 resource_size_t len;
461 int i;
462
463 if (zpci_use_mio(zdev))
464 return;
465
466 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
467 len = pci_resource_len(pdev, i);
468 if (!len)
469 continue;
470 pci_iounmap_fh(pdev, (void __iomem __force *)
471 pdev->resource[i].start);
472 }
473}
474
475static int zpci_alloc_iomap(struct zpci_dev *zdev)
476{
477 unsigned long entry;
478
479 spin_lock(&zpci_iomap_lock);
480 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
481 if (entry == ZPCI_IOMAP_ENTRIES) {
482 spin_unlock(&zpci_iomap_lock);
483 return -ENOSPC;
484 }
485 set_bit(entry, zpci_iomap_bitmap);
486 spin_unlock(&zpci_iomap_lock);
487 return entry;
488}
489
490static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
491{
492 spin_lock(&zpci_iomap_lock);
493 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
494 clear_bit(entry, zpci_iomap_bitmap);
495 spin_unlock(&zpci_iomap_lock);
496}
497
498static void zpci_do_update_iomap_fh(struct zpci_dev *zdev, u32 fh)
499{
500 int bar, idx;
501
502 spin_lock(&zpci_iomap_lock);
503 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
504 if (!zdev->bars[bar].size)
505 continue;
506 idx = zdev->bars[bar].map_idx;
507 if (!zpci_iomap_start[idx].count)
508 continue;
509 WRITE_ONCE(zpci_iomap_start[idx].fh, zdev->fh);
510 }
511 spin_unlock(&zpci_iomap_lock);
512}
513
514void zpci_update_fh(struct zpci_dev *zdev, u32 fh)
515{
516 if (!fh || zdev->fh == fh)
517 return;
518
519 zdev->fh = fh;
520 if (zpci_use_mio(zdev))
521 return;
522 if (zdev->has_resources && zdev_enabled(zdev))
523 zpci_do_update_iomap_fh(zdev, fh);
524}
525
526static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
527 unsigned long size, unsigned long flags)
528{
529 struct resource *r;
530
531 r = kzalloc(sizeof(*r), GFP_KERNEL);
532 if (!r)
533 return NULL;
534
535 r->start = start;
536 r->end = r->start + size - 1;
537 r->flags = flags;
538 r->name = zdev->res_name;
539
540 if (request_resource(&iomem_resource, r)) {
541 kfree(r);
542 return NULL;
543 }
544 return r;
545}
546
547int zpci_setup_bus_resources(struct zpci_dev *zdev,
548 struct list_head *resources)
549{
550 unsigned long addr, size, flags;
551 struct resource *res;
552 int i, entry;
553
554 snprintf(zdev->res_name, sizeof(zdev->res_name),
555 "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR);
556
557 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
558 if (!zdev->bars[i].size)
559 continue;
560 entry = zpci_alloc_iomap(zdev);
561 if (entry < 0)
562 return entry;
563 zdev->bars[i].map_idx = entry;
564
565 /* only MMIO is supported */
566 flags = IORESOURCE_MEM;
567 if (zdev->bars[i].val & 8)
568 flags |= IORESOURCE_PREFETCH;
569 if (zdev->bars[i].val & 4)
570 flags |= IORESOURCE_MEM_64;
571
572 if (zpci_use_mio(zdev))
573 addr = (unsigned long) zdev->bars[i].mio_wt;
574 else
575 addr = ZPCI_ADDR(entry);
576 size = 1UL << zdev->bars[i].size;
577
578 res = __alloc_res(zdev, addr, size, flags);
579 if (!res) {
580 zpci_free_iomap(zdev, entry);
581 return -ENOMEM;
582 }
583 zdev->bars[i].res = res;
584 pci_add_resource(resources, res);
585 }
586 zdev->has_resources = 1;
587
588 return 0;
589}
590
591static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
592{
593 int i;
594
595 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
596 if (!zdev->bars[i].size || !zdev->bars[i].res)
597 continue;
598
599 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
600 release_resource(zdev->bars[i].res);
601 kfree(zdev->bars[i].res);
602 }
603 zdev->has_resources = 0;
604}
605
606int pcibios_device_add(struct pci_dev *pdev)
607{
608 struct zpci_dev *zdev = to_zpci(pdev);
609 struct resource *res;
610 int i;
611
612 /* The pdev has a reference to the zdev via its bus */
613 zpci_zdev_get(zdev);
614 if (pdev->is_physfn)
615 pdev->no_vf_scan = 1;
616
617 pdev->dev.groups = zpci_attr_groups;
618 pdev->dev.dma_ops = &s390_pci_dma_ops;
619 zpci_map_resources(pdev);
620
621 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
622 res = &pdev->resource[i];
623 if (res->parent || !res->flags)
624 continue;
625 pci_claim_resource(pdev, i);
626 }
627
628 return 0;
629}
630
631void pcibios_release_device(struct pci_dev *pdev)
632{
633 struct zpci_dev *zdev = to_zpci(pdev);
634
635 zpci_unmap_resources(pdev);
636 zpci_zdev_put(zdev);
637}
638
639int pcibios_enable_device(struct pci_dev *pdev, int mask)
640{
641 struct zpci_dev *zdev = to_zpci(pdev);
642
643 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
644 zpci_fmb_enable_device(zdev);
645
646 return pci_enable_resources(pdev, mask);
647}
648
649void pcibios_disable_device(struct pci_dev *pdev)
650{
651 struct zpci_dev *zdev = to_zpci(pdev);
652
653 zpci_fmb_disable_device(zdev);
654 zpci_debug_exit_device(zdev);
655}
656
657static int __zpci_register_domain(int domain)
658{
659 spin_lock(&zpci_domain_lock);
660 if (test_bit(domain, zpci_domain)) {
661 spin_unlock(&zpci_domain_lock);
662 pr_err("Domain %04x is already assigned\n", domain);
663 return -EEXIST;
664 }
665 set_bit(domain, zpci_domain);
666 spin_unlock(&zpci_domain_lock);
667 return domain;
668}
669
670static int __zpci_alloc_domain(void)
671{
672 int domain;
673
674 spin_lock(&zpci_domain_lock);
675 /*
676 * We can always auto allocate domains below ZPCI_NR_DEVICES.
677 * There is either a free domain or we have reached the maximum in
678 * which case we would have bailed earlier.
679 */
680 domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
681 set_bit(domain, zpci_domain);
682 spin_unlock(&zpci_domain_lock);
683 return domain;
684}
685
686int zpci_alloc_domain(int domain)
687{
688 if (zpci_unique_uid) {
689 if (domain)
690 return __zpci_register_domain(domain);
691 pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n");
692 update_uid_checking(false);
693 }
694 return __zpci_alloc_domain();
695}
696
697void zpci_free_domain(int domain)
698{
699 spin_lock(&zpci_domain_lock);
700 clear_bit(domain, zpci_domain);
701 spin_unlock(&zpci_domain_lock);
702}
703
704
705int zpci_enable_device(struct zpci_dev *zdev)
706{
707 u32 fh = zdev->fh;
708 int rc = 0;
709
710 if (clp_enable_fh(zdev, &fh, ZPCI_NR_DMA_SPACES))
711 rc = -EIO;
712 else
713 zpci_update_fh(zdev, fh);
714 return rc;
715}
716EXPORT_SYMBOL_GPL(zpci_enable_device);
717
718int zpci_disable_device(struct zpci_dev *zdev)
719{
720 u32 fh = zdev->fh;
721 int cc, rc = 0;
722
723 cc = clp_disable_fh(zdev, &fh);
724 if (!cc) {
725 zpci_update_fh(zdev, fh);
726 } else if (cc == CLP_RC_SETPCIFN_ALRDY) {
727 pr_info("Disabling PCI function %08x had no effect as it was already disabled\n",
728 zdev->fid);
729 /* Function is already disabled - update handle */
730 rc = clp_refresh_fh(zdev->fid, &fh);
731 if (!rc) {
732 zpci_update_fh(zdev, fh);
733 rc = -EINVAL;
734 }
735 } else {
736 rc = -EIO;
737 }
738 return rc;
739}
740EXPORT_SYMBOL_GPL(zpci_disable_device);
741
742/**
743 * zpci_hot_reset_device - perform a reset of the given zPCI function
744 * @zdev: the slot which should be reset
745 *
746 * Performs a low level reset of the zPCI function. The reset is low level in
747 * the sense that the zPCI function can be reset without detaching it from the
748 * common PCI subsystem. The reset may be performed while under control of
749 * either DMA or IOMMU APIs in which case the existing DMA/IOMMU translation
750 * table is reinstated at the end of the reset.
751 *
752 * After the reset the functions internal state is reset to an initial state
753 * equivalent to its state during boot when first probing a driver.
754 * Consequently after reset the PCI function requires re-initialization via the
755 * common PCI code including re-enabling IRQs via pci_alloc_irq_vectors()
756 * and enabling the function via e.g.pci_enablde_device_flags().The caller
757 * must guard against concurrent reset attempts.
758 *
759 * In most cases this function should not be called directly but through
760 * pci_reset_function() or pci_reset_bus() which handle the save/restore and
761 * locking.
762 *
763 * Return: 0 on success and an error value otherwise
764 */
765int zpci_hot_reset_device(struct zpci_dev *zdev)
766{
767 u8 status;
768 int rc;
769
770 zpci_dbg(3, "rst fid:%x, fh:%x\n", zdev->fid, zdev->fh);
771 if (zdev_enabled(zdev)) {
772 /* Disables device access, DMAs and IRQs (reset state) */
773 rc = zpci_disable_device(zdev);
774 /*
775 * Due to a z/VM vs LPAR inconsistency in the error state the
776 * FH may indicate an enabled device but disable says the
777 * device is already disabled don't treat it as an error here.
778 */
779 if (rc == -EINVAL)
780 rc = 0;
781 if (rc)
782 return rc;
783 }
784
785 rc = zpci_enable_device(zdev);
786 if (rc)
787 return rc;
788
789 if (zdev->dma_table)
790 rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
791 virt_to_phys(zdev->dma_table), &status);
792 else
793 rc = zpci_dma_init_device(zdev);
794 if (rc) {
795 zpci_disable_device(zdev);
796 return rc;
797 }
798
799 return 0;
800}
801
802/**
803 * zpci_create_device() - Create a new zpci_dev and add it to the zbus
804 * @fid: Function ID of the device to be created
805 * @fh: Current Function Handle of the device to be created
806 * @state: Initial state after creation either Standby or Configured
807 *
808 * Creates a new zpci device and adds it to its, possibly newly created, zbus
809 * as well as zpci_list.
810 *
811 * Returns: the zdev on success or an error pointer otherwise
812 */
813struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state)
814{
815 struct zpci_dev *zdev;
816 int rc;
817
818 zpci_dbg(1, "add fid:%x, fh:%x, c:%d\n", fid, fh, state);
819 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
820 if (!zdev)
821 return ERR_PTR(-ENOMEM);
822
823 /* FID and Function Handle are the static/dynamic identifiers */
824 zdev->fid = fid;
825 zdev->fh = fh;
826
827 /* Query function properties and update zdev */
828 rc = clp_query_pci_fn(zdev);
829 if (rc)
830 goto error;
831 zdev->state = state;
832
833 kref_init(&zdev->kref);
834 mutex_init(&zdev->lock);
835 mutex_init(&zdev->kzdev_lock);
836
837 rc = zpci_init_iommu(zdev);
838 if (rc)
839 goto error;
840
841 rc = zpci_bus_device_register(zdev, &pci_root_ops);
842 if (rc)
843 goto error_destroy_iommu;
844
845 spin_lock(&zpci_list_lock);
846 list_add_tail(&zdev->entry, &zpci_list);
847 spin_unlock(&zpci_list_lock);
848
849 return zdev;
850
851error_destroy_iommu:
852 zpci_destroy_iommu(zdev);
853error:
854 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
855 kfree(zdev);
856 return ERR_PTR(rc);
857}
858
859bool zpci_is_device_configured(struct zpci_dev *zdev)
860{
861 enum zpci_state state = zdev->state;
862
863 return state != ZPCI_FN_STATE_RESERVED &&
864 state != ZPCI_FN_STATE_STANDBY;
865}
866
867/**
868 * zpci_scan_configured_device() - Scan a freshly configured zpci_dev
869 * @zdev: The zpci_dev to be configured
870 * @fh: The general function handle supplied by the platform
871 *
872 * Given a device in the configuration state Configured, enables, scans and
873 * adds it to the common code PCI subsystem if possible. If the PCI device is
874 * parked because we can not yet create a PCI bus because we have not seen
875 * function 0, it is ignored but will be scanned once function 0 appears.
876 * If any failure occurs, the zpci_dev is left disabled.
877 *
878 * Return: 0 on success, or an error code otherwise
879 */
880int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh)
881{
882 int rc;
883
884 zpci_update_fh(zdev, fh);
885 /* the PCI function will be scanned once function 0 appears */
886 if (!zdev->zbus->bus)
887 return 0;
888
889 /* For function 0 on a multi-function bus scan whole bus as we might
890 * have to pick up existing functions waiting for it to allow creating
891 * the PCI bus
892 */
893 if (zdev->devfn == 0 && zdev->zbus->multifunction)
894 rc = zpci_bus_scan_bus(zdev->zbus);
895 else
896 rc = zpci_bus_scan_device(zdev);
897
898 return rc;
899}
900
901/**
902 * zpci_deconfigure_device() - Deconfigure a zpci_dev
903 * @zdev: The zpci_dev to configure
904 *
905 * Deconfigure a zPCI function that is currently configured and possibly known
906 * to the common code PCI subsystem.
907 * If any failure occurs the device is left as is.
908 *
909 * Return: 0 on success, or an error code otherwise
910 */
911int zpci_deconfigure_device(struct zpci_dev *zdev)
912{
913 int rc;
914
915 if (zdev->zbus->bus)
916 zpci_bus_remove_device(zdev, false);
917
918 if (zdev->dma_table) {
919 rc = zpci_dma_exit_device(zdev);
920 if (rc)
921 return rc;
922 }
923 if (zdev_enabled(zdev)) {
924 rc = zpci_disable_device(zdev);
925 if (rc)
926 return rc;
927 }
928
929 rc = sclp_pci_deconfigure(zdev->fid);
930 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, rc);
931 if (rc)
932 return rc;
933 zdev->state = ZPCI_FN_STATE_STANDBY;
934
935 return 0;
936}
937
938/**
939 * zpci_device_reserved() - Mark device as resverved
940 * @zdev: the zpci_dev that was reserved
941 *
942 * Handle the case that a given zPCI function was reserved by another system.
943 * After a call to this function the zpci_dev can not be found via
944 * get_zdev_by_fid() anymore but may still be accessible via existing
945 * references though it will not be functional anymore.
946 */
947void zpci_device_reserved(struct zpci_dev *zdev)
948{
949 if (zdev->has_hp_slot)
950 zpci_exit_slot(zdev);
951 /*
952 * Remove device from zpci_list as it is going away. This also
953 * makes sure we ignore subsequent zPCI events for this device.
954 */
955 spin_lock(&zpci_list_lock);
956 list_del(&zdev->entry);
957 spin_unlock(&zpci_list_lock);
958 zdev->state = ZPCI_FN_STATE_RESERVED;
959 zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
960 zpci_zdev_put(zdev);
961}
962
963void zpci_release_device(struct kref *kref)
964{
965 struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref);
966 int ret;
967
968 if (zdev->zbus->bus)
969 zpci_bus_remove_device(zdev, false);
970
971 if (zdev->dma_table)
972 zpci_dma_exit_device(zdev);
973 if (zdev_enabled(zdev))
974 zpci_disable_device(zdev);
975
976 switch (zdev->state) {
977 case ZPCI_FN_STATE_CONFIGURED:
978 ret = sclp_pci_deconfigure(zdev->fid);
979 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
980 fallthrough;
981 case ZPCI_FN_STATE_STANDBY:
982 if (zdev->has_hp_slot)
983 zpci_exit_slot(zdev);
984 spin_lock(&zpci_list_lock);
985 list_del(&zdev->entry);
986 spin_unlock(&zpci_list_lock);
987 zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
988 fallthrough;
989 case ZPCI_FN_STATE_RESERVED:
990 if (zdev->has_resources)
991 zpci_cleanup_bus_resources(zdev);
992 zpci_bus_device_unregister(zdev);
993 zpci_destroy_iommu(zdev);
994 fallthrough;
995 default:
996 break;
997 }
998 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
999 kfree_rcu(zdev, rcu);
1000}
1001
1002int zpci_report_error(struct pci_dev *pdev,
1003 struct zpci_report_error_header *report)
1004{
1005 struct zpci_dev *zdev = to_zpci(pdev);
1006
1007 return sclp_pci_report(report, zdev->fh, zdev->fid);
1008}
1009EXPORT_SYMBOL(zpci_report_error);
1010
1011/**
1012 * zpci_clear_error_state() - Clears the zPCI error state of the device
1013 * @zdev: The zdev for which the zPCI error state should be reset
1014 *
1015 * Clear the zPCI error state of the device. If clearing the zPCI error state
1016 * fails the device is left in the error state. In this case it may make sense
1017 * to call zpci_io_perm_failure() on the associated pdev if it exists.
1018 *
1019 * Returns: 0 on success, -EIO otherwise
1020 */
1021int zpci_clear_error_state(struct zpci_dev *zdev)
1022{
1023 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_ERROR);
1024 struct zpci_fib fib = {0};
1025 u8 status;
1026 int cc;
1027
1028 cc = zpci_mod_fc(req, &fib, &status);
1029 if (cc) {
1030 zpci_dbg(3, "ces fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
1031 return -EIO;
1032 }
1033
1034 return 0;
1035}
1036
1037/**
1038 * zpci_reset_load_store_blocked() - Re-enables L/S from error state
1039 * @zdev: The zdev for which to unblock load/store access
1040 *
1041 * Re-enables load/store access for a PCI function in the error state while
1042 * keeping DMA blocked. In this state drivers can poke MMIO space to determine
1043 * if error recovery is possible while catching any rogue DMA access from the
1044 * device.
1045 *
1046 * Returns: 0 on success, -EIO otherwise
1047 */
1048int zpci_reset_load_store_blocked(struct zpci_dev *zdev)
1049{
1050 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_BLOCK);
1051 struct zpci_fib fib = {0};
1052 u8 status;
1053 int cc;
1054
1055 cc = zpci_mod_fc(req, &fib, &status);
1056 if (cc) {
1057 zpci_dbg(3, "rls fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
1058 return -EIO;
1059 }
1060
1061 return 0;
1062}
1063
1064static int zpci_mem_init(void)
1065{
1066 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
1067 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
1068
1069 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
1070 __alignof__(struct zpci_fmb), 0, NULL);
1071 if (!zdev_fmb_cache)
1072 goto error_fmb;
1073
1074 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
1075 sizeof(*zpci_iomap_start), GFP_KERNEL);
1076 if (!zpci_iomap_start)
1077 goto error_iomap;
1078
1079 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
1080 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
1081 if (!zpci_iomap_bitmap)
1082 goto error_iomap_bitmap;
1083
1084 if (static_branch_likely(&have_mio))
1085 clp_setup_writeback_mio();
1086
1087 return 0;
1088error_iomap_bitmap:
1089 kfree(zpci_iomap_start);
1090error_iomap:
1091 kmem_cache_destroy(zdev_fmb_cache);
1092error_fmb:
1093 return -ENOMEM;
1094}
1095
1096static void zpci_mem_exit(void)
1097{
1098 kfree(zpci_iomap_bitmap);
1099 kfree(zpci_iomap_start);
1100 kmem_cache_destroy(zdev_fmb_cache);
1101}
1102
1103static unsigned int s390_pci_probe __initdata = 1;
1104unsigned int s390_pci_force_floating __initdata;
1105static unsigned int s390_pci_initialized;
1106
1107char * __init pcibios_setup(char *str)
1108{
1109 if (!strcmp(str, "off")) {
1110 s390_pci_probe = 0;
1111 return NULL;
1112 }
1113 if (!strcmp(str, "nomio")) {
1114 S390_lowcore.machine_flags &= ~MACHINE_FLAG_PCI_MIO;
1115 return NULL;
1116 }
1117 if (!strcmp(str, "force_floating")) {
1118 s390_pci_force_floating = 1;
1119 return NULL;
1120 }
1121 if (!strcmp(str, "norid")) {
1122 s390_pci_no_rid = 1;
1123 return NULL;
1124 }
1125 return str;
1126}
1127
1128bool zpci_is_enabled(void)
1129{
1130 return s390_pci_initialized;
1131}
1132
1133static int __init pci_base_init(void)
1134{
1135 int rc;
1136
1137 if (!s390_pci_probe)
1138 return 0;
1139
1140 if (!test_facility(69) || !test_facility(71)) {
1141 pr_info("PCI is not supported because CPU facilities 69 or 71 are not available\n");
1142 return 0;
1143 }
1144
1145 if (MACHINE_HAS_PCI_MIO) {
1146 static_branch_enable(&have_mio);
1147 ctl_set_bit(2, 5);
1148 }
1149
1150 rc = zpci_debug_init();
1151 if (rc)
1152 goto out;
1153
1154 rc = zpci_mem_init();
1155 if (rc)
1156 goto out_mem;
1157
1158 rc = zpci_irq_init();
1159 if (rc)
1160 goto out_irq;
1161
1162 rc = zpci_dma_init();
1163 if (rc)
1164 goto out_dma;
1165
1166 rc = clp_scan_pci_devices();
1167 if (rc)
1168 goto out_find;
1169 zpci_bus_scan_busses();
1170
1171 s390_pci_initialized = 1;
1172 return 0;
1173
1174out_find:
1175 zpci_dma_exit();
1176out_dma:
1177 zpci_irq_exit();
1178out_irq:
1179 zpci_mem_exit();
1180out_mem:
1181 zpci_debug_exit();
1182out:
1183 return rc;
1184}
1185subsys_initcall_sync(pci_base_init);
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 */
49static LIST_HEAD(zpci_list);
50static DEFINE_SPINLOCK(zpci_list_lock);
51
52static 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
58static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
59static DEFINE_SPINLOCK(zpci_domain_lock);
60
61static struct airq_iv *zpci_aisb_iv;
62static 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
68static DEFINE_SPINLOCK(zpci_iomap_lock);
69static unsigned long *zpci_iomap_bitmap;
70struct zpci_iomap_entry *zpci_iomap_start;
71EXPORT_SYMBOL_GPL(zpci_iomap_start);
72
73static struct kmem_cache *zdev_fmb_cache;
74
75struct 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
90void 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
109static 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
114int pci_domain_nr(struct pci_bus *bus)
115{
116 return ((struct zpci_dev *) bus->sysdata)->domain;
117}
118EXPORT_SYMBOL_GPL(pci_domain_nr);
119
120int pci_proc_domain(struct pci_bus *bus)
121{
122 return pci_domain_nr(bus);
123}
124EXPORT_SYMBOL_GPL(pci_proc_domain);
125
126/* Modify PCI: Register adapter interruptions */
127static 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 */
145static 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 */
160int 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 */
175int 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 */
188int 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 */
217int 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
238static 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
254static 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
266resource_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 */
274void __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 */
280void __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}
301EXPORT_SYMBOL(pci_iomap_range);
302
303void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
304{
305 return pci_iomap_range(dev, bar, 0, maxlen);
306}
307EXPORT_SYMBOL(pci_iomap);
308
309void 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}
322EXPORT_SYMBOL(pci_iounmap);
323
324static 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
338static 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
352static struct pci_ops pci_root_ops = {
353 .read = pci_read,
354 .write = pci_write,
355};
356
357static 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
392int 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
448void 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
486static 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
501static 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
515static struct airq_struct zpci_airq = {
516 .handler = zpci_irq_handler,
517 .isc = PCI_ISC,
518};
519
520static 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
538out_airq:
539 unregister_adapter_interrupt(&zpci_airq);
540out:
541 return rc;
542}
543
544static void zpci_irq_exit(void)
545{
546 airq_iv_release(zpci_aisb_iv);
547 unregister_adapter_interrupt(&zpci_airq);
548}
549
550static 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
565static 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
573static 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
594static 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
634static 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
648int 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
667void pcibios_release_device(struct pci_dev *pdev)
668{
669 zpci_unmap_resources(pdev);
670}
671
672int 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
682void 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
691static 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
708out:
709 return ret;
710}
711
712static 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
725struct 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
733static 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
761static 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
771void 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
788static 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
807error:
808 zpci_cleanup_bus_resources(zdev);
809 pci_free_resource_list(&resources);
810 return ret;
811}
812
813int 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
828out_dma:
829 clp_disable_fh(zdev);
830out:
831 return rc;
832}
833EXPORT_SYMBOL_GPL(zpci_enable_device);
834
835int zpci_disable_device(struct zpci_dev *zdev)
836{
837 zpci_dma_exit_device(zdev);
838 return clp_disable_fh(zdev);
839}
840EXPORT_SYMBOL_GPL(zpci_disable_device);
841
842int 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
872out_disable:
873 if (zdev->state == ZPCI_FN_STATE_ONLINE)
874 zpci_disable_device(zdev);
875out_destroy_iommu:
876 zpci_destroy_iommu(zdev);
877out_free:
878 zpci_free_domain(zdev);
879out:
880 return rc;
881}
882
883void 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
892int 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}
899EXPORT_SYMBOL(zpci_report_error);
900
901static 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;
922error_iomap_bitmap:
923 kfree(zpci_iomap_start);
924error_iomap:
925 kmem_cache_destroy(zdev_fmb_cache);
926error_fmb:
927 return -ENOMEM;
928}
929
930static 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
937static unsigned int s390_pci_probe = 1;
938static unsigned int s390_pci_initialized;
939
940char * __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
949bool zpci_is_enabled(void)
950{
951 return s390_pci_initialized;
952}
953
954static 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
987out_find:
988 zpci_dma_exit();
989out_dma:
990 zpci_irq_exit();
991out_irq:
992 zpci_mem_exit();
993out_mem:
994 zpci_debug_exit();
995out:
996 return rc;
997}
998subsys_initcall_sync(pci_base_init);
999
1000void zpci_rescan(void)
1001{
1002 if (zpci_is_enabled())
1003 clp_rescan_pci_devices_simple();
1004}