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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}
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}