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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
31#include <asm/isc.h>
32#include <asm/airq.h>
33#include <asm/facility.h>
34#include <asm/pci_insn.h>
35#include <asm/pci_clp.h>
36#include <asm/pci_dma.h>
37
38/* list of all detected zpci devices */
39static LIST_HEAD(zpci_list);
40static DEFINE_SPINLOCK(zpci_list_lock);
41
42static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
43static DEFINE_SPINLOCK(zpci_domain_lock);
44
45#define ZPCI_IOMAP_ENTRIES \
46 min(((unsigned long) ZPCI_NR_DEVICES * PCI_BAR_COUNT / 2), \
47 ZPCI_IOMAP_MAX_ENTRIES)
48
49static DEFINE_SPINLOCK(zpci_iomap_lock);
50static unsigned long *zpci_iomap_bitmap;
51struct zpci_iomap_entry *zpci_iomap_start;
52EXPORT_SYMBOL_GPL(zpci_iomap_start);
53
54DEFINE_STATIC_KEY_FALSE(have_mio);
55
56static struct kmem_cache *zdev_fmb_cache;
57
58struct zpci_dev *get_zdev_by_fid(u32 fid)
59{
60 struct zpci_dev *tmp, *zdev = NULL;
61
62 spin_lock(&zpci_list_lock);
63 list_for_each_entry(tmp, &zpci_list, entry) {
64 if (tmp->fid == fid) {
65 zdev = tmp;
66 break;
67 }
68 }
69 spin_unlock(&zpci_list_lock);
70 return zdev;
71}
72
73void zpci_remove_reserved_devices(void)
74{
75 struct zpci_dev *tmp, *zdev;
76 enum zpci_state state;
77 LIST_HEAD(remove);
78
79 spin_lock(&zpci_list_lock);
80 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
81 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
82 !clp_get_state(zdev->fid, &state) &&
83 state == ZPCI_FN_STATE_RESERVED)
84 list_move_tail(&zdev->entry, &remove);
85 }
86 spin_unlock(&zpci_list_lock);
87
88 list_for_each_entry_safe(zdev, tmp, &remove, entry)
89 zpci_remove_device(zdev);
90}
91
92static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
93{
94 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
95}
96
97int pci_domain_nr(struct pci_bus *bus)
98{
99 return ((struct zpci_dev *) bus->sysdata)->domain;
100}
101EXPORT_SYMBOL_GPL(pci_domain_nr);
102
103int pci_proc_domain(struct pci_bus *bus)
104{
105 return pci_domain_nr(bus);
106}
107EXPORT_SYMBOL_GPL(pci_proc_domain);
108
109/* Modify PCI: Register I/O address translation parameters */
110int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
111 u64 base, u64 limit, u64 iota)
112{
113 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
114 struct zpci_fib fib = {0};
115 u8 status;
116
117 WARN_ON_ONCE(iota & 0x3fff);
118 fib.pba = base;
119 fib.pal = limit;
120 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
121 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
122}
123
124/* Modify PCI: Unregister I/O address translation parameters */
125int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
126{
127 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
128 struct zpci_fib fib = {0};
129 u8 cc, status;
130
131 cc = zpci_mod_fc(req, &fib, &status);
132 if (cc == 3) /* Function already gone. */
133 cc = 0;
134 return cc ? -EIO : 0;
135}
136
137/* Modify PCI: Set PCI function measurement parameters */
138int zpci_fmb_enable_device(struct zpci_dev *zdev)
139{
140 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
141 struct zpci_fib fib = {0};
142 u8 cc, status;
143
144 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
145 return -EINVAL;
146
147 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
148 if (!zdev->fmb)
149 return -ENOMEM;
150 WARN_ON((u64) zdev->fmb & 0xf);
151
152 /* reset software counters */
153 atomic64_set(&zdev->allocated_pages, 0);
154 atomic64_set(&zdev->mapped_pages, 0);
155 atomic64_set(&zdev->unmapped_pages, 0);
156
157 fib.fmb_addr = virt_to_phys(zdev->fmb);
158 cc = zpci_mod_fc(req, &fib, &status);
159 if (cc) {
160 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
161 zdev->fmb = NULL;
162 }
163 return cc ? -EIO : 0;
164}
165
166/* Modify PCI: Disable PCI function measurement */
167int zpci_fmb_disable_device(struct zpci_dev *zdev)
168{
169 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
170 struct zpci_fib fib = {0};
171 u8 cc, status;
172
173 if (!zdev->fmb)
174 return -EINVAL;
175
176 /* Function measurement is disabled if fmb address is zero */
177 cc = zpci_mod_fc(req, &fib, &status);
178 if (cc == 3) /* Function already gone. */
179 cc = 0;
180
181 if (!cc) {
182 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
183 zdev->fmb = NULL;
184 }
185 return cc ? -EIO : 0;
186}
187
188static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
189{
190 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
191 u64 data;
192 int rc;
193
194 rc = __zpci_load(&data, req, offset);
195 if (!rc) {
196 data = le64_to_cpu((__force __le64) data);
197 data >>= (8 - len) * 8;
198 *val = (u32) data;
199 } else
200 *val = 0xffffffff;
201 return rc;
202}
203
204static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
205{
206 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
207 u64 data = val;
208 int rc;
209
210 data <<= (8 - len) * 8;
211 data = (__force u64) cpu_to_le64(data);
212 rc = __zpci_store(data, req, offset);
213 return rc;
214}
215
216resource_size_t pcibios_align_resource(void *data, const struct resource *res,
217 resource_size_t size,
218 resource_size_t align)
219{
220 return 0;
221}
222
223/* combine single writes by using store-block insn */
224void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
225{
226 zpci_memcpy_toio(to, from, count);
227}
228
229void __iomem *ioremap(unsigned long ioaddr, unsigned long size)
230{
231 struct vm_struct *area;
232 unsigned long offset;
233
234 if (!size)
235 return NULL;
236
237 if (!static_branch_unlikely(&have_mio))
238 return (void __iomem *) ioaddr;
239
240 offset = ioaddr & ~PAGE_MASK;
241 ioaddr &= PAGE_MASK;
242 size = PAGE_ALIGN(size + offset);
243 area = get_vm_area(size, VM_IOREMAP);
244 if (!area)
245 return NULL;
246
247 if (ioremap_page_range((unsigned long) area->addr,
248 (unsigned long) area->addr + size,
249 ioaddr, PAGE_KERNEL)) {
250 vunmap(area->addr);
251 return NULL;
252 }
253 return (void __iomem *) ((unsigned long) area->addr + offset);
254}
255EXPORT_SYMBOL(ioremap);
256
257void iounmap(volatile void __iomem *addr)
258{
259 if (static_branch_likely(&have_mio))
260 vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
261}
262EXPORT_SYMBOL(iounmap);
263
264/* Create a virtual mapping cookie for a PCI BAR */
265static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
266 unsigned long offset, unsigned long max)
267{
268 struct zpci_dev *zdev = to_zpci(pdev);
269 int idx;
270
271 idx = zdev->bars[bar].map_idx;
272 spin_lock(&zpci_iomap_lock);
273 /* Detect overrun */
274 WARN_ON(!++zpci_iomap_start[idx].count);
275 zpci_iomap_start[idx].fh = zdev->fh;
276 zpci_iomap_start[idx].bar = bar;
277 spin_unlock(&zpci_iomap_lock);
278
279 return (void __iomem *) ZPCI_ADDR(idx) + offset;
280}
281
282static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
283 unsigned long offset,
284 unsigned long max)
285{
286 unsigned long barsize = pci_resource_len(pdev, bar);
287 struct zpci_dev *zdev = to_zpci(pdev);
288 void __iomem *iova;
289
290 iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
291 return iova ? iova + offset : iova;
292}
293
294void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
295 unsigned long offset, unsigned long max)
296{
297 if (!pci_resource_len(pdev, bar) || bar >= PCI_BAR_COUNT)
298 return NULL;
299
300 if (static_branch_likely(&have_mio))
301 return pci_iomap_range_mio(pdev, bar, offset, max);
302 else
303 return pci_iomap_range_fh(pdev, bar, offset, max);
304}
305EXPORT_SYMBOL(pci_iomap_range);
306
307void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
308{
309 return pci_iomap_range(dev, bar, 0, maxlen);
310}
311EXPORT_SYMBOL(pci_iomap);
312
313static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
314 unsigned long offset, unsigned long max)
315{
316 unsigned long barsize = pci_resource_len(pdev, bar);
317 struct zpci_dev *zdev = to_zpci(pdev);
318 void __iomem *iova;
319
320 iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
321 return iova ? iova + offset : iova;
322}
323
324void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
325 unsigned long offset, unsigned long max)
326{
327 if (!pci_resource_len(pdev, bar) || bar >= PCI_BAR_COUNT)
328 return NULL;
329
330 if (static_branch_likely(&have_mio))
331 return pci_iomap_wc_range_mio(pdev, bar, offset, max);
332 else
333 return pci_iomap_range_fh(pdev, bar, offset, max);
334}
335EXPORT_SYMBOL(pci_iomap_wc_range);
336
337void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
338{
339 return pci_iomap_wc_range(dev, bar, 0, maxlen);
340}
341EXPORT_SYMBOL(pci_iomap_wc);
342
343static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
344{
345 unsigned int idx = ZPCI_IDX(addr);
346
347 spin_lock(&zpci_iomap_lock);
348 /* Detect underrun */
349 WARN_ON(!zpci_iomap_start[idx].count);
350 if (!--zpci_iomap_start[idx].count) {
351 zpci_iomap_start[idx].fh = 0;
352 zpci_iomap_start[idx].bar = 0;
353 }
354 spin_unlock(&zpci_iomap_lock);
355}
356
357static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
358{
359 iounmap(addr);
360}
361
362void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
363{
364 if (static_branch_likely(&have_mio))
365 pci_iounmap_mio(pdev, addr);
366 else
367 pci_iounmap_fh(pdev, addr);
368}
369EXPORT_SYMBOL(pci_iounmap);
370
371static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
372 int size, u32 *val)
373{
374 struct zpci_dev *zdev = get_zdev_by_bus(bus);
375 int ret;
376
377 if (!zdev || devfn != ZPCI_DEVFN)
378 ret = -ENODEV;
379 else
380 ret = zpci_cfg_load(zdev, where, val, size);
381
382 return ret;
383}
384
385static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
386 int size, u32 val)
387{
388 struct zpci_dev *zdev = get_zdev_by_bus(bus);
389 int ret;
390
391 if (!zdev || devfn != ZPCI_DEVFN)
392 ret = -ENODEV;
393 else
394 ret = zpci_cfg_store(zdev, where, val, size);
395
396 return ret;
397}
398
399static struct pci_ops pci_root_ops = {
400 .read = pci_read,
401 .write = pci_write,
402};
403
404#ifdef CONFIG_PCI_IOV
405static struct resource iov_res = {
406 .name = "PCI IOV res",
407 .start = 0,
408 .end = -1,
409 .flags = IORESOURCE_MEM,
410};
411#endif
412
413static void zpci_map_resources(struct pci_dev *pdev)
414{
415 struct zpci_dev *zdev = to_zpci(pdev);
416 resource_size_t len;
417 int i;
418
419 for (i = 0; i < PCI_BAR_COUNT; i++) {
420 len = pci_resource_len(pdev, i);
421 if (!len)
422 continue;
423
424 if (zpci_use_mio(zdev))
425 pdev->resource[i].start =
426 (resource_size_t __force) zdev->bars[i].mio_wb;
427 else
428 pdev->resource[i].start = (resource_size_t __force)
429 pci_iomap_range_fh(pdev, i, 0, 0);
430 pdev->resource[i].end = pdev->resource[i].start + len - 1;
431 }
432
433#ifdef CONFIG_PCI_IOV
434 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
435 int bar = i + PCI_IOV_RESOURCES;
436
437 len = pci_resource_len(pdev, bar);
438 if (!len)
439 continue;
440 pdev->resource[bar].parent = &iov_res;
441 }
442#endif
443}
444
445static void zpci_unmap_resources(struct pci_dev *pdev)
446{
447 struct zpci_dev *zdev = to_zpci(pdev);
448 resource_size_t len;
449 int i;
450
451 if (zpci_use_mio(zdev))
452 return;
453
454 for (i = 0; i < PCI_BAR_COUNT; i++) {
455 len = pci_resource_len(pdev, i);
456 if (!len)
457 continue;
458 pci_iounmap_fh(pdev, (void __iomem __force *)
459 pdev->resource[i].start);
460 }
461}
462
463static int zpci_alloc_iomap(struct zpci_dev *zdev)
464{
465 unsigned long entry;
466
467 spin_lock(&zpci_iomap_lock);
468 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
469 if (entry == ZPCI_IOMAP_ENTRIES) {
470 spin_unlock(&zpci_iomap_lock);
471 return -ENOSPC;
472 }
473 set_bit(entry, zpci_iomap_bitmap);
474 spin_unlock(&zpci_iomap_lock);
475 return entry;
476}
477
478static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
479{
480 spin_lock(&zpci_iomap_lock);
481 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
482 clear_bit(entry, zpci_iomap_bitmap);
483 spin_unlock(&zpci_iomap_lock);
484}
485
486static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
487 unsigned long size, unsigned long flags)
488{
489 struct resource *r;
490
491 r = kzalloc(sizeof(*r), GFP_KERNEL);
492 if (!r)
493 return NULL;
494
495 r->start = start;
496 r->end = r->start + size - 1;
497 r->flags = flags;
498 r->name = zdev->res_name;
499
500 if (request_resource(&iomem_resource, r)) {
501 kfree(r);
502 return NULL;
503 }
504 return r;
505}
506
507static int zpci_setup_bus_resources(struct zpci_dev *zdev,
508 struct list_head *resources)
509{
510 unsigned long addr, size, flags;
511 struct resource *res;
512 int i, entry;
513
514 snprintf(zdev->res_name, sizeof(zdev->res_name),
515 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
516
517 for (i = 0; i < PCI_BAR_COUNT; i++) {
518 if (!zdev->bars[i].size)
519 continue;
520 entry = zpci_alloc_iomap(zdev);
521 if (entry < 0)
522 return entry;
523 zdev->bars[i].map_idx = entry;
524
525 /* only MMIO is supported */
526 flags = IORESOURCE_MEM;
527 if (zdev->bars[i].val & 8)
528 flags |= IORESOURCE_PREFETCH;
529 if (zdev->bars[i].val & 4)
530 flags |= IORESOURCE_MEM_64;
531
532 if (zpci_use_mio(zdev))
533 addr = (unsigned long) zdev->bars[i].mio_wb;
534 else
535 addr = ZPCI_ADDR(entry);
536 size = 1UL << zdev->bars[i].size;
537
538 res = __alloc_res(zdev, addr, size, flags);
539 if (!res) {
540 zpci_free_iomap(zdev, entry);
541 return -ENOMEM;
542 }
543 zdev->bars[i].res = res;
544 pci_add_resource(resources, res);
545 }
546
547 return 0;
548}
549
550static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
551{
552 int i;
553
554 for (i = 0; i < PCI_BAR_COUNT; i++) {
555 if (!zdev->bars[i].size || !zdev->bars[i].res)
556 continue;
557
558 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
559 release_resource(zdev->bars[i].res);
560 kfree(zdev->bars[i].res);
561 }
562}
563
564int pcibios_add_device(struct pci_dev *pdev)
565{
566 struct resource *res;
567 int i;
568
569 if (pdev->is_physfn)
570 pdev->no_vf_scan = 1;
571
572 pdev->dev.groups = zpci_attr_groups;
573 pdev->dev.dma_ops = &s390_pci_dma_ops;
574 zpci_map_resources(pdev);
575
576 for (i = 0; i < PCI_BAR_COUNT; i++) {
577 res = &pdev->resource[i];
578 if (res->parent || !res->flags)
579 continue;
580 pci_claim_resource(pdev, i);
581 }
582
583 return 0;
584}
585
586void pcibios_release_device(struct pci_dev *pdev)
587{
588 zpci_unmap_resources(pdev);
589}
590
591int pcibios_enable_device(struct pci_dev *pdev, int mask)
592{
593 struct zpci_dev *zdev = to_zpci(pdev);
594
595 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
596 zpci_fmb_enable_device(zdev);
597
598 return pci_enable_resources(pdev, mask);
599}
600
601void pcibios_disable_device(struct pci_dev *pdev)
602{
603 struct zpci_dev *zdev = to_zpci(pdev);
604
605 zpci_fmb_disable_device(zdev);
606 zpci_debug_exit_device(zdev);
607}
608
609#ifdef CONFIG_HIBERNATE_CALLBACKS
610static int zpci_restore(struct device *dev)
611{
612 struct pci_dev *pdev = to_pci_dev(dev);
613 struct zpci_dev *zdev = to_zpci(pdev);
614 int ret = 0;
615
616 if (zdev->state != ZPCI_FN_STATE_ONLINE)
617 goto out;
618
619 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
620 if (ret)
621 goto out;
622
623 zpci_map_resources(pdev);
624 zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
625 (u64) zdev->dma_table);
626
627out:
628 return ret;
629}
630
631static int zpci_freeze(struct device *dev)
632{
633 struct pci_dev *pdev = to_pci_dev(dev);
634 struct zpci_dev *zdev = to_zpci(pdev);
635
636 if (zdev->state != ZPCI_FN_STATE_ONLINE)
637 return 0;
638
639 zpci_unregister_ioat(zdev, 0);
640 zpci_unmap_resources(pdev);
641 return clp_disable_fh(zdev);
642}
643
644struct dev_pm_ops pcibios_pm_ops = {
645 .thaw_noirq = zpci_restore,
646 .freeze_noirq = zpci_freeze,
647 .restore_noirq = zpci_restore,
648 .poweroff_noirq = zpci_freeze,
649};
650#endif /* CONFIG_HIBERNATE_CALLBACKS */
651
652static int zpci_alloc_domain(struct zpci_dev *zdev)
653{
654 if (zpci_unique_uid) {
655 zdev->domain = (u16) zdev->uid;
656 if (zdev->domain >= ZPCI_NR_DEVICES)
657 return 0;
658
659 spin_lock(&zpci_domain_lock);
660 if (test_bit(zdev->domain, zpci_domain)) {
661 spin_unlock(&zpci_domain_lock);
662 return -EEXIST;
663 }
664 set_bit(zdev->domain, zpci_domain);
665 spin_unlock(&zpci_domain_lock);
666 return 0;
667 }
668
669 spin_lock(&zpci_domain_lock);
670 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
671 if (zdev->domain == ZPCI_NR_DEVICES) {
672 spin_unlock(&zpci_domain_lock);
673 return -ENOSPC;
674 }
675 set_bit(zdev->domain, zpci_domain);
676 spin_unlock(&zpci_domain_lock);
677 return 0;
678}
679
680static void zpci_free_domain(struct zpci_dev *zdev)
681{
682 if (zdev->domain >= ZPCI_NR_DEVICES)
683 return;
684
685 spin_lock(&zpci_domain_lock);
686 clear_bit(zdev->domain, zpci_domain);
687 spin_unlock(&zpci_domain_lock);
688}
689
690void pcibios_remove_bus(struct pci_bus *bus)
691{
692 struct zpci_dev *zdev = get_zdev_by_bus(bus);
693
694 zpci_exit_slot(zdev);
695 zpci_cleanup_bus_resources(zdev);
696 zpci_destroy_iommu(zdev);
697 zpci_free_domain(zdev);
698
699 spin_lock(&zpci_list_lock);
700 list_del(&zdev->entry);
701 spin_unlock(&zpci_list_lock);
702
703 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
704 kfree(zdev);
705}
706
707static int zpci_scan_bus(struct zpci_dev *zdev)
708{
709 LIST_HEAD(resources);
710 int ret;
711
712 ret = zpci_setup_bus_resources(zdev, &resources);
713 if (ret)
714 goto error;
715
716 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
717 zdev, &resources);
718 if (!zdev->bus) {
719 ret = -EIO;
720 goto error;
721 }
722 zdev->bus->max_bus_speed = zdev->max_bus_speed;
723 pci_bus_add_devices(zdev->bus);
724 return 0;
725
726error:
727 zpci_cleanup_bus_resources(zdev);
728 pci_free_resource_list(&resources);
729 return ret;
730}
731
732int zpci_enable_device(struct zpci_dev *zdev)
733{
734 int rc;
735
736 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
737 if (rc)
738 goto out;
739
740 rc = zpci_dma_init_device(zdev);
741 if (rc)
742 goto out_dma;
743
744 zdev->state = ZPCI_FN_STATE_ONLINE;
745 return 0;
746
747out_dma:
748 clp_disable_fh(zdev);
749out:
750 return rc;
751}
752EXPORT_SYMBOL_GPL(zpci_enable_device);
753
754int zpci_disable_device(struct zpci_dev *zdev)
755{
756 zpci_dma_exit_device(zdev);
757 return clp_disable_fh(zdev);
758}
759EXPORT_SYMBOL_GPL(zpci_disable_device);
760
761int zpci_create_device(struct zpci_dev *zdev)
762{
763 int rc;
764
765 rc = zpci_alloc_domain(zdev);
766 if (rc)
767 goto out;
768
769 rc = zpci_init_iommu(zdev);
770 if (rc)
771 goto out_free;
772
773 mutex_init(&zdev->lock);
774 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
775 rc = zpci_enable_device(zdev);
776 if (rc)
777 goto out_destroy_iommu;
778 }
779 rc = zpci_scan_bus(zdev);
780 if (rc)
781 goto out_disable;
782
783 spin_lock(&zpci_list_lock);
784 list_add_tail(&zdev->entry, &zpci_list);
785 spin_unlock(&zpci_list_lock);
786
787 zpci_init_slot(zdev);
788
789 return 0;
790
791out_disable:
792 if (zdev->state == ZPCI_FN_STATE_ONLINE)
793 zpci_disable_device(zdev);
794out_destroy_iommu:
795 zpci_destroy_iommu(zdev);
796out_free:
797 zpci_free_domain(zdev);
798out:
799 return rc;
800}
801
802void zpci_remove_device(struct zpci_dev *zdev)
803{
804 if (!zdev->bus)
805 return;
806
807 pci_stop_root_bus(zdev->bus);
808 pci_remove_root_bus(zdev->bus);
809}
810
811int zpci_report_error(struct pci_dev *pdev,
812 struct zpci_report_error_header *report)
813{
814 struct zpci_dev *zdev = to_zpci(pdev);
815
816 return sclp_pci_report(report, zdev->fh, zdev->fid);
817}
818EXPORT_SYMBOL(zpci_report_error);
819
820static int zpci_mem_init(void)
821{
822 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
823 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
824
825 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
826 __alignof__(struct zpci_fmb), 0, NULL);
827 if (!zdev_fmb_cache)
828 goto error_fmb;
829
830 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
831 sizeof(*zpci_iomap_start), GFP_KERNEL);
832 if (!zpci_iomap_start)
833 goto error_iomap;
834
835 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
836 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
837 if (!zpci_iomap_bitmap)
838 goto error_iomap_bitmap;
839
840 return 0;
841error_iomap_bitmap:
842 kfree(zpci_iomap_start);
843error_iomap:
844 kmem_cache_destroy(zdev_fmb_cache);
845error_fmb:
846 return -ENOMEM;
847}
848
849static void zpci_mem_exit(void)
850{
851 kfree(zpci_iomap_bitmap);
852 kfree(zpci_iomap_start);
853 kmem_cache_destroy(zdev_fmb_cache);
854}
855
856static unsigned int s390_pci_probe __initdata = 1;
857static unsigned int s390_pci_no_mio __initdata;
858unsigned int s390_pci_force_floating __initdata;
859static unsigned int s390_pci_initialized;
860
861char * __init pcibios_setup(char *str)
862{
863 if (!strcmp(str, "off")) {
864 s390_pci_probe = 0;
865 return NULL;
866 }
867 if (!strcmp(str, "nomio")) {
868 s390_pci_no_mio = 1;
869 return NULL;
870 }
871 if (!strcmp(str, "force_floating")) {
872 s390_pci_force_floating = 1;
873 return NULL;
874 }
875 return str;
876}
877
878bool zpci_is_enabled(void)
879{
880 return s390_pci_initialized;
881}
882
883static int __init pci_base_init(void)
884{
885 int rc;
886
887 if (!s390_pci_probe)
888 return 0;
889
890 if (!test_facility(69) || !test_facility(71))
891 return 0;
892
893 if (test_facility(153) && !s390_pci_no_mio) {
894 static_branch_enable(&have_mio);
895 ctl_set_bit(2, 5);
896 }
897
898 rc = zpci_debug_init();
899 if (rc)
900 goto out;
901
902 rc = zpci_mem_init();
903 if (rc)
904 goto out_mem;
905
906 rc = zpci_irq_init();
907 if (rc)
908 goto out_irq;
909
910 rc = zpci_dma_init();
911 if (rc)
912 goto out_dma;
913
914 rc = clp_scan_pci_devices();
915 if (rc)
916 goto out_find;
917
918 s390_pci_initialized = 1;
919 return 0;
920
921out_find:
922 zpci_dma_exit();
923out_dma:
924 zpci_irq_exit();
925out_irq:
926 zpci_mem_exit();
927out_mem:
928 zpci_debug_exit();
929out:
930 return rc;
931}
932subsys_initcall_sync(pci_base_init);
933
934void zpci_rescan(void)
935{
936 if (zpci_is_enabled())
937 clp_rescan_pci_devices_simple();
938}