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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#include <linux/lockdep.h>
32#include <linux/list_sort.h>
33
34#include <asm/isc.h>
35#include <asm/airq.h>
36#include <asm/facility.h>
37#include <asm/pci_insn.h>
38#include <asm/pci_clp.h>
39#include <asm/pci_dma.h>
40
41#include "pci_bus.h"
42#include "pci_iov.h"
43
44/* list of all detected zpci devices */
45static LIST_HEAD(zpci_list);
46static DEFINE_SPINLOCK(zpci_list_lock);
47
48static DECLARE_BITMAP(zpci_domain, ZPCI_DOMAIN_BITMAP_SIZE);
49static DEFINE_SPINLOCK(zpci_domain_lock);
50
51#define ZPCI_IOMAP_ENTRIES \
52 min(((unsigned long) ZPCI_NR_DEVICES * PCI_STD_NUM_BARS / 2), \
53 ZPCI_IOMAP_MAX_ENTRIES)
54
55unsigned int s390_pci_no_rid;
56
57static DEFINE_SPINLOCK(zpci_iomap_lock);
58static unsigned long *zpci_iomap_bitmap;
59struct zpci_iomap_entry *zpci_iomap_start;
60EXPORT_SYMBOL_GPL(zpci_iomap_start);
61
62DEFINE_STATIC_KEY_FALSE(have_mio);
63
64static struct kmem_cache *zdev_fmb_cache;
65
66/* AEN structures that must be preserved over KVM module re-insertion */
67union zpci_sic_iib *zpci_aipb;
68EXPORT_SYMBOL_GPL(zpci_aipb);
69struct airq_iv *zpci_aif_sbv;
70EXPORT_SYMBOL_GPL(zpci_aif_sbv);
71
72struct zpci_dev *get_zdev_by_fid(u32 fid)
73{
74 struct zpci_dev *tmp, *zdev = NULL;
75
76 spin_lock(&zpci_list_lock);
77 list_for_each_entry(tmp, &zpci_list, entry) {
78 if (tmp->fid == fid) {
79 zdev = tmp;
80 zpci_zdev_get(zdev);
81 break;
82 }
83 }
84 spin_unlock(&zpci_list_lock);
85 return zdev;
86}
87
88void zpci_remove_reserved_devices(void)
89{
90 struct zpci_dev *tmp, *zdev;
91 enum zpci_state state;
92 LIST_HEAD(remove);
93
94 spin_lock(&zpci_list_lock);
95 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
96 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
97 !clp_get_state(zdev->fid, &state) &&
98 state == ZPCI_FN_STATE_RESERVED)
99 list_move_tail(&zdev->entry, &remove);
100 }
101 spin_unlock(&zpci_list_lock);
102
103 list_for_each_entry_safe(zdev, tmp, &remove, entry)
104 zpci_device_reserved(zdev);
105}
106
107int pci_domain_nr(struct pci_bus *bus)
108{
109 return ((struct zpci_bus *) bus->sysdata)->domain_nr;
110}
111EXPORT_SYMBOL_GPL(pci_domain_nr);
112
113int pci_proc_domain(struct pci_bus *bus)
114{
115 return pci_domain_nr(bus);
116}
117EXPORT_SYMBOL_GPL(pci_proc_domain);
118
119/* Modify PCI: Register I/O address translation parameters */
120int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
121 u64 base, u64 limit, u64 iota, u8 *status)
122{
123 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
124 struct zpci_fib fib = {0};
125 u8 cc;
126
127 WARN_ON_ONCE(iota & 0x3fff);
128 fib.pba = base;
129 /* Work around off by one in ISM virt device */
130 if (zdev->pft == PCI_FUNC_TYPE_ISM && limit > base)
131 fib.pal = limit + (1 << 12);
132 else
133 fib.pal = limit;
134 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
135 fib.gd = zdev->gisa;
136 cc = zpci_mod_fc(req, &fib, status);
137 if (cc)
138 zpci_dbg(3, "reg ioat fid:%x, cc:%d, status:%d\n", zdev->fid, cc, *status);
139 return cc;
140}
141EXPORT_SYMBOL_GPL(zpci_register_ioat);
142
143/* Modify PCI: Unregister I/O address translation parameters */
144int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
145{
146 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
147 struct zpci_fib fib = {0};
148 u8 cc, status;
149
150 fib.gd = zdev->gisa;
151
152 cc = zpci_mod_fc(req, &fib, &status);
153 if (cc)
154 zpci_dbg(3, "unreg ioat fid:%x, cc:%d, status:%d\n", zdev->fid, cc, status);
155 return cc;
156}
157
158/* Modify PCI: Set PCI function measurement parameters */
159int zpci_fmb_enable_device(struct zpci_dev *zdev)
160{
161 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
162 struct zpci_iommu_ctrs *ctrs;
163 struct zpci_fib fib = {0};
164 unsigned long flags;
165 u8 cc, status;
166
167 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
168 return -EINVAL;
169
170 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
171 if (!zdev->fmb)
172 return -ENOMEM;
173 WARN_ON((u64) zdev->fmb & 0xf);
174
175 /* reset software counters */
176 spin_lock_irqsave(&zdev->dom_lock, flags);
177 ctrs = zpci_get_iommu_ctrs(zdev);
178 if (ctrs) {
179 atomic64_set(&ctrs->mapped_pages, 0);
180 atomic64_set(&ctrs->unmapped_pages, 0);
181 atomic64_set(&ctrs->global_rpcits, 0);
182 atomic64_set(&ctrs->sync_map_rpcits, 0);
183 atomic64_set(&ctrs->sync_rpcits, 0);
184 }
185 spin_unlock_irqrestore(&zdev->dom_lock, flags);
186
187
188 fib.fmb_addr = virt_to_phys(zdev->fmb);
189 fib.gd = zdev->gisa;
190 cc = zpci_mod_fc(req, &fib, &status);
191 if (cc) {
192 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
193 zdev->fmb = NULL;
194 }
195 return cc ? -EIO : 0;
196}
197
198/* Modify PCI: Disable PCI function measurement */
199int zpci_fmb_disable_device(struct zpci_dev *zdev)
200{
201 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
202 struct zpci_fib fib = {0};
203 u8 cc, status;
204
205 if (!zdev->fmb)
206 return -EINVAL;
207
208 fib.gd = zdev->gisa;
209
210 /* Function measurement is disabled if fmb address is zero */
211 cc = zpci_mod_fc(req, &fib, &status);
212 if (cc == 3) /* Function already gone. */
213 cc = 0;
214
215 if (!cc) {
216 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
217 zdev->fmb = NULL;
218 }
219 return cc ? -EIO : 0;
220}
221
222static int zpci_cfg_load(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;
226 int rc;
227
228 rc = __zpci_load(&data, req, offset);
229 if (!rc) {
230 data = le64_to_cpu((__force __le64) data);
231 data >>= (8 - len) * 8;
232 *val = (u32) data;
233 } else
234 *val = 0xffffffff;
235 return rc;
236}
237
238static int zpci_cfg_store(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 = val;
242 int rc;
243
244 data <<= (8 - len) * 8;
245 data = (__force u64) cpu_to_le64(data);
246 rc = __zpci_store(data, req, offset);
247 return rc;
248}
249
250resource_size_t pcibios_align_resource(void *data, const struct resource *res,
251 resource_size_t size,
252 resource_size_t align)
253{
254 return 0;
255}
256
257void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
258 unsigned long prot)
259{
260 /*
261 * When PCI MIO instructions are unavailable the "physical" address
262 * encodes a hint for accessing the PCI memory space it represents.
263 * Just pass it unchanged such that ioread/iowrite can decode it.
264 */
265 if (!static_branch_unlikely(&have_mio))
266 return (void __iomem *)phys_addr;
267
268 return generic_ioremap_prot(phys_addr, size, __pgprot(prot));
269}
270EXPORT_SYMBOL(ioremap_prot);
271
272void iounmap(volatile void __iomem *addr)
273{
274 if (static_branch_likely(&have_mio))
275 generic_iounmap(addr);
276}
277EXPORT_SYMBOL(iounmap);
278
279/* Create a virtual mapping cookie for a PCI BAR */
280static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
281 unsigned long offset, unsigned long max)
282{
283 struct zpci_dev *zdev = to_zpci(pdev);
284 int idx;
285
286 idx = zdev->bars[bar].map_idx;
287 spin_lock(&zpci_iomap_lock);
288 /* Detect overrun */
289 WARN_ON(!++zpci_iomap_start[idx].count);
290 zpci_iomap_start[idx].fh = zdev->fh;
291 zpci_iomap_start[idx].bar = bar;
292 spin_unlock(&zpci_iomap_lock);
293
294 return (void __iomem *) ZPCI_ADDR(idx) + offset;
295}
296
297static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
298 unsigned long offset,
299 unsigned long max)
300{
301 unsigned long barsize = pci_resource_len(pdev, bar);
302 struct zpci_dev *zdev = to_zpci(pdev);
303 void __iomem *iova;
304
305 iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
306 return iova ? iova + offset : iova;
307}
308
309void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
310 unsigned long offset, unsigned long max)
311{
312 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
313 return NULL;
314
315 if (static_branch_likely(&have_mio))
316 return pci_iomap_range_mio(pdev, bar, offset, max);
317 else
318 return pci_iomap_range_fh(pdev, bar, offset, max);
319}
320EXPORT_SYMBOL(pci_iomap_range);
321
322void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
323{
324 return pci_iomap_range(dev, bar, 0, maxlen);
325}
326EXPORT_SYMBOL(pci_iomap);
327
328static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
329 unsigned long offset, unsigned long max)
330{
331 unsigned long barsize = pci_resource_len(pdev, bar);
332 struct zpci_dev *zdev = to_zpci(pdev);
333 void __iomem *iova;
334
335 iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
336 return iova ? iova + offset : iova;
337}
338
339void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
340 unsigned long offset, unsigned long max)
341{
342 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
343 return NULL;
344
345 if (static_branch_likely(&have_mio))
346 return pci_iomap_wc_range_mio(pdev, bar, offset, max);
347 else
348 return pci_iomap_range_fh(pdev, bar, offset, max);
349}
350EXPORT_SYMBOL(pci_iomap_wc_range);
351
352void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
353{
354 return pci_iomap_wc_range(dev, bar, 0, maxlen);
355}
356EXPORT_SYMBOL(pci_iomap_wc);
357
358static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
359{
360 unsigned int idx = ZPCI_IDX(addr);
361
362 spin_lock(&zpci_iomap_lock);
363 /* Detect underrun */
364 WARN_ON(!zpci_iomap_start[idx].count);
365 if (!--zpci_iomap_start[idx].count) {
366 zpci_iomap_start[idx].fh = 0;
367 zpci_iomap_start[idx].bar = 0;
368 }
369 spin_unlock(&zpci_iomap_lock);
370}
371
372static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
373{
374 iounmap(addr);
375}
376
377void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
378{
379 if (static_branch_likely(&have_mio))
380 pci_iounmap_mio(pdev, addr);
381 else
382 pci_iounmap_fh(pdev, addr);
383}
384EXPORT_SYMBOL(pci_iounmap);
385
386static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
387 int size, u32 *val)
388{
389 struct zpci_dev *zdev = zdev_from_bus(bus, devfn);
390
391 return (zdev) ? zpci_cfg_load(zdev, where, val, size) : -ENODEV;
392}
393
394static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
395 int size, u32 val)
396{
397 struct zpci_dev *zdev = zdev_from_bus(bus, devfn);
398
399 return (zdev) ? zpci_cfg_store(zdev, where, val, size) : -ENODEV;
400}
401
402static struct pci_ops pci_root_ops = {
403 .read = pci_read,
404 .write = pci_write,
405};
406
407static void zpci_map_resources(struct pci_dev *pdev)
408{
409 struct zpci_dev *zdev = to_zpci(pdev);
410 resource_size_t len;
411 int i;
412
413 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
414 len = pci_resource_len(pdev, i);
415 if (!len)
416 continue;
417
418 if (zpci_use_mio(zdev))
419 pdev->resource[i].start =
420 (resource_size_t __force) zdev->bars[i].mio_wt;
421 else
422 pdev->resource[i].start = (resource_size_t __force)
423 pci_iomap_range_fh(pdev, i, 0, 0);
424 pdev->resource[i].end = pdev->resource[i].start + len - 1;
425 }
426
427 zpci_iov_map_resources(pdev);
428}
429
430static void zpci_unmap_resources(struct pci_dev *pdev)
431{
432 struct zpci_dev *zdev = to_zpci(pdev);
433 resource_size_t len;
434 int i;
435
436 if (zpci_use_mio(zdev))
437 return;
438
439 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
440 len = pci_resource_len(pdev, i);
441 if (!len)
442 continue;
443 pci_iounmap_fh(pdev, (void __iomem __force *)
444 pdev->resource[i].start);
445 }
446}
447
448static int zpci_alloc_iomap(struct zpci_dev *zdev)
449{
450 unsigned long entry;
451
452 spin_lock(&zpci_iomap_lock);
453 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
454 if (entry == ZPCI_IOMAP_ENTRIES) {
455 spin_unlock(&zpci_iomap_lock);
456 return -ENOSPC;
457 }
458 set_bit(entry, zpci_iomap_bitmap);
459 spin_unlock(&zpci_iomap_lock);
460 return entry;
461}
462
463static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
464{
465 spin_lock(&zpci_iomap_lock);
466 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
467 clear_bit(entry, zpci_iomap_bitmap);
468 spin_unlock(&zpci_iomap_lock);
469}
470
471static void zpci_do_update_iomap_fh(struct zpci_dev *zdev, u32 fh)
472{
473 int bar, idx;
474
475 spin_lock(&zpci_iomap_lock);
476 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
477 if (!zdev->bars[bar].size)
478 continue;
479 idx = zdev->bars[bar].map_idx;
480 if (!zpci_iomap_start[idx].count)
481 continue;
482 WRITE_ONCE(zpci_iomap_start[idx].fh, zdev->fh);
483 }
484 spin_unlock(&zpci_iomap_lock);
485}
486
487void zpci_update_fh(struct zpci_dev *zdev, u32 fh)
488{
489 if (!fh || zdev->fh == fh)
490 return;
491
492 zdev->fh = fh;
493 if (zpci_use_mio(zdev))
494 return;
495 if (zdev->has_resources && zdev_enabled(zdev))
496 zpci_do_update_iomap_fh(zdev, fh);
497}
498
499static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
500 unsigned long size, unsigned long flags)
501{
502 struct resource *r;
503
504 r = kzalloc(sizeof(*r), GFP_KERNEL);
505 if (!r)
506 return NULL;
507
508 r->start = start;
509 r->end = r->start + size - 1;
510 r->flags = flags;
511 r->name = zdev->res_name;
512
513 if (request_resource(&iomem_resource, r)) {
514 kfree(r);
515 return NULL;
516 }
517 return r;
518}
519
520int zpci_setup_bus_resources(struct zpci_dev *zdev)
521{
522 unsigned long addr, size, flags;
523 struct resource *res;
524 int i, entry;
525
526 snprintf(zdev->res_name, sizeof(zdev->res_name),
527 "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR);
528
529 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
530 if (!zdev->bars[i].size)
531 continue;
532 entry = zpci_alloc_iomap(zdev);
533 if (entry < 0)
534 return entry;
535 zdev->bars[i].map_idx = entry;
536
537 /* only MMIO is supported */
538 flags = IORESOURCE_MEM;
539 if (zdev->bars[i].val & 8)
540 flags |= IORESOURCE_PREFETCH;
541 if (zdev->bars[i].val & 4)
542 flags |= IORESOURCE_MEM_64;
543
544 if (zpci_use_mio(zdev))
545 addr = (unsigned long) zdev->bars[i].mio_wt;
546 else
547 addr = ZPCI_ADDR(entry);
548 size = 1UL << zdev->bars[i].size;
549
550 res = __alloc_res(zdev, addr, size, flags);
551 if (!res) {
552 zpci_free_iomap(zdev, entry);
553 return -ENOMEM;
554 }
555 zdev->bars[i].res = res;
556 }
557 zdev->has_resources = 1;
558
559 return 0;
560}
561
562static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
563{
564 struct resource *res;
565 int i;
566
567 pci_lock_rescan_remove();
568 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
569 res = zdev->bars[i].res;
570 if (!res)
571 continue;
572
573 release_resource(res);
574 pci_bus_remove_resource(zdev->zbus->bus, res);
575 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
576 zdev->bars[i].res = NULL;
577 kfree(res);
578 }
579 zdev->has_resources = 0;
580 pci_unlock_rescan_remove();
581}
582
583int pcibios_device_add(struct pci_dev *pdev)
584{
585 struct zpci_dev *zdev = to_zpci(pdev);
586 struct resource *res;
587 int i;
588
589 /* The pdev has a reference to the zdev via its bus */
590 zpci_zdev_get(zdev);
591 if (pdev->is_physfn)
592 pdev->no_vf_scan = 1;
593
594 zpci_map_resources(pdev);
595
596 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
597 res = &pdev->resource[i];
598 if (res->parent || !res->flags)
599 continue;
600 pci_claim_resource(pdev, i);
601 }
602
603 return 0;
604}
605
606void pcibios_release_device(struct pci_dev *pdev)
607{
608 struct zpci_dev *zdev = to_zpci(pdev);
609
610 zpci_unmap_resources(pdev);
611 zpci_zdev_put(zdev);
612}
613
614int pcibios_enable_device(struct pci_dev *pdev, int mask)
615{
616 struct zpci_dev *zdev = to_zpci(pdev);
617
618 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
619 zpci_fmb_enable_device(zdev);
620
621 return pci_enable_resources(pdev, mask);
622}
623
624void pcibios_disable_device(struct pci_dev *pdev)
625{
626 struct zpci_dev *zdev = to_zpci(pdev);
627
628 zpci_fmb_disable_device(zdev);
629 zpci_debug_exit_device(zdev);
630}
631
632static int __zpci_register_domain(int domain)
633{
634 spin_lock(&zpci_domain_lock);
635 if (test_bit(domain, zpci_domain)) {
636 spin_unlock(&zpci_domain_lock);
637 pr_err("Domain %04x is already assigned\n", domain);
638 return -EEXIST;
639 }
640 set_bit(domain, zpci_domain);
641 spin_unlock(&zpci_domain_lock);
642 return domain;
643}
644
645static int __zpci_alloc_domain(void)
646{
647 int domain;
648
649 spin_lock(&zpci_domain_lock);
650 /*
651 * We can always auto allocate domains below ZPCI_NR_DEVICES.
652 * There is either a free domain or we have reached the maximum in
653 * which case we would have bailed earlier.
654 */
655 domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
656 set_bit(domain, zpci_domain);
657 spin_unlock(&zpci_domain_lock);
658 return domain;
659}
660
661int zpci_alloc_domain(int domain)
662{
663 if (zpci_unique_uid) {
664 if (domain)
665 return __zpci_register_domain(domain);
666 pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n");
667 update_uid_checking(false);
668 }
669 return __zpci_alloc_domain();
670}
671
672void zpci_free_domain(int domain)
673{
674 spin_lock(&zpci_domain_lock);
675 clear_bit(domain, zpci_domain);
676 spin_unlock(&zpci_domain_lock);
677}
678
679
680int zpci_enable_device(struct zpci_dev *zdev)
681{
682 u32 fh = zdev->fh;
683 int rc = 0;
684
685 if (clp_enable_fh(zdev, &fh, ZPCI_NR_DMA_SPACES))
686 rc = -EIO;
687 else
688 zpci_update_fh(zdev, fh);
689 return rc;
690}
691EXPORT_SYMBOL_GPL(zpci_enable_device);
692
693int zpci_disable_device(struct zpci_dev *zdev)
694{
695 u32 fh = zdev->fh;
696 int cc, rc = 0;
697
698 cc = clp_disable_fh(zdev, &fh);
699 if (!cc) {
700 zpci_update_fh(zdev, fh);
701 } else if (cc == CLP_RC_SETPCIFN_ALRDY) {
702 pr_info("Disabling PCI function %08x had no effect as it was already disabled\n",
703 zdev->fid);
704 /* Function is already disabled - update handle */
705 rc = clp_refresh_fh(zdev->fid, &fh);
706 if (!rc) {
707 zpci_update_fh(zdev, fh);
708 rc = -EINVAL;
709 }
710 } else {
711 rc = -EIO;
712 }
713 return rc;
714}
715EXPORT_SYMBOL_GPL(zpci_disable_device);
716
717/**
718 * zpci_hot_reset_device - perform a reset of the given zPCI function
719 * @zdev: the slot which should be reset
720 *
721 * Performs a low level reset of the zPCI function. The reset is low level in
722 * the sense that the zPCI function can be reset without detaching it from the
723 * common PCI subsystem. The reset may be performed while under control of
724 * either DMA or IOMMU APIs in which case the existing DMA/IOMMU translation
725 * table is reinstated at the end of the reset.
726 *
727 * After the reset the functions internal state is reset to an initial state
728 * equivalent to its state during boot when first probing a driver.
729 * Consequently after reset the PCI function requires re-initialization via the
730 * common PCI code including re-enabling IRQs via pci_alloc_irq_vectors()
731 * and enabling the function via e.g. pci_enable_device_flags(). The caller
732 * must guard against concurrent reset attempts.
733 *
734 * In most cases this function should not be called directly but through
735 * pci_reset_function() or pci_reset_bus() which handle the save/restore and
736 * locking - asserted by lockdep.
737 *
738 * Return: 0 on success and an error value otherwise
739 */
740int zpci_hot_reset_device(struct zpci_dev *zdev)
741{
742 u8 status;
743 int rc;
744
745 lockdep_assert_held(&zdev->state_lock);
746 zpci_dbg(3, "rst fid:%x, fh:%x\n", zdev->fid, zdev->fh);
747 if (zdev_enabled(zdev)) {
748 /* Disables device access, DMAs and IRQs (reset state) */
749 rc = zpci_disable_device(zdev);
750 /*
751 * Due to a z/VM vs LPAR inconsistency in the error state the
752 * FH may indicate an enabled device but disable says the
753 * device is already disabled don't treat it as an error here.
754 */
755 if (rc == -EINVAL)
756 rc = 0;
757 if (rc)
758 return rc;
759 }
760
761 rc = zpci_enable_device(zdev);
762 if (rc)
763 return rc;
764
765 if (zdev->dma_table)
766 rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
767 virt_to_phys(zdev->dma_table), &status);
768 if (rc) {
769 zpci_disable_device(zdev);
770 return rc;
771 }
772
773 return 0;
774}
775
776/**
777 * zpci_create_device() - Create a new zpci_dev and add it to the zbus
778 * @fid: Function ID of the device to be created
779 * @fh: Current Function Handle of the device to be created
780 * @state: Initial state after creation either Standby or Configured
781 *
782 * Allocates a new struct zpci_dev and queries the platform for its details.
783 * If successful the device can subsequently be added to the zPCI subsystem
784 * using zpci_add_device().
785 *
786 * Returns: the zdev on success or an error pointer otherwise
787 */
788struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state)
789{
790 struct zpci_dev *zdev;
791 int rc;
792
793 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
794 if (!zdev)
795 return ERR_PTR(-ENOMEM);
796
797 /* FID and Function Handle are the static/dynamic identifiers */
798 zdev->fid = fid;
799 zdev->fh = fh;
800
801 /* Query function properties and update zdev */
802 rc = clp_query_pci_fn(zdev);
803 if (rc)
804 goto error;
805 zdev->state = state;
806
807 mutex_init(&zdev->state_lock);
808 mutex_init(&zdev->fmb_lock);
809 mutex_init(&zdev->kzdev_lock);
810
811 return zdev;
812
813error:
814 zpci_dbg(0, "crt fid:%x, rc:%d\n", fid, rc);
815 kfree(zdev);
816 return ERR_PTR(rc);
817}
818
819/**
820 * zpci_add_device() - Add a previously created zPCI device to the zPCI subsystem
821 * @zdev: The zPCI device to be added
822 *
823 * A struct zpci_dev is added to the zPCI subsystem and to a virtual PCI bus creating
824 * a new one as necessary. A hotplug slot is created and events start to be handled.
825 * If successful from this point on zpci_zdev_get() and zpci_zdev_put() must be used.
826 * If adding the struct zpci_dev fails the device was not added and should be freed.
827 *
828 * Return: 0 on success, or an error code otherwise
829 */
830int zpci_add_device(struct zpci_dev *zdev)
831{
832 int rc;
833
834 zpci_dbg(1, "add fid:%x, fh:%x, c:%d\n", zdev->fid, zdev->fh, zdev->state);
835 rc = zpci_init_iommu(zdev);
836 if (rc)
837 goto error;
838
839 rc = zpci_bus_device_register(zdev, &pci_root_ops);
840 if (rc)
841 goto error_destroy_iommu;
842
843 kref_init(&zdev->kref);
844 spin_lock(&zpci_list_lock);
845 list_add_tail(&zdev->entry, &zpci_list);
846 spin_unlock(&zpci_list_lock);
847 return 0;
848
849error_destroy_iommu:
850 zpci_destroy_iommu(zdev);
851error:
852 zpci_dbg(0, "add fid:%x, rc:%d\n", zdev->fid, rc);
853 return rc;
854}
855
856bool zpci_is_device_configured(struct zpci_dev *zdev)
857{
858 enum zpci_state state = zdev->state;
859
860 return state != ZPCI_FN_STATE_RESERVED &&
861 state != ZPCI_FN_STATE_STANDBY;
862}
863
864/**
865 * zpci_scan_configured_device() - Scan a freshly configured zpci_dev
866 * @zdev: The zpci_dev to be configured
867 * @fh: The general function handle supplied by the platform
868 *
869 * Given a device in the configuration state Configured, enables, scans and
870 * adds it to the common code PCI subsystem if possible. If any failure occurs,
871 * the zpci_dev is left disabled.
872 *
873 * Return: 0 on success, or an error code otherwise
874 */
875int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh)
876{
877 zpci_update_fh(zdev, fh);
878 return zpci_bus_scan_device(zdev);
879}
880
881/**
882 * zpci_deconfigure_device() - Deconfigure a zpci_dev
883 * @zdev: The zpci_dev to configure
884 *
885 * Deconfigure a zPCI function that is currently configured and possibly known
886 * to the common code PCI subsystem.
887 * If any failure occurs the device is left as is.
888 *
889 * Return: 0 on success, or an error code otherwise
890 */
891int zpci_deconfigure_device(struct zpci_dev *zdev)
892{
893 int rc;
894
895 lockdep_assert_held(&zdev->state_lock);
896 if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
897 return 0;
898
899 if (zdev->zbus->bus)
900 zpci_bus_remove_device(zdev, false);
901
902 if (zdev_enabled(zdev)) {
903 rc = zpci_disable_device(zdev);
904 if (rc)
905 return rc;
906 }
907
908 rc = sclp_pci_deconfigure(zdev->fid);
909 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, rc);
910 if (rc)
911 return rc;
912 zdev->state = ZPCI_FN_STATE_STANDBY;
913
914 return 0;
915}
916
917/**
918 * zpci_device_reserved() - Mark device as reserved
919 * @zdev: the zpci_dev that was reserved
920 *
921 * Handle the case that a given zPCI function was reserved by another system.
922 * After a call to this function the zpci_dev can not be found via
923 * get_zdev_by_fid() anymore but may still be accessible via existing
924 * references though it will not be functional anymore.
925 */
926void zpci_device_reserved(struct zpci_dev *zdev)
927{
928 /*
929 * Remove device from zpci_list as it is going away. This also
930 * makes sure we ignore subsequent zPCI events for this device.
931 */
932 spin_lock(&zpci_list_lock);
933 list_del(&zdev->entry);
934 spin_unlock(&zpci_list_lock);
935 zdev->state = ZPCI_FN_STATE_RESERVED;
936 zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
937 zpci_zdev_put(zdev);
938}
939
940void zpci_release_device(struct kref *kref)
941{
942 struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref);
943
944 WARN_ON(zdev->state != ZPCI_FN_STATE_RESERVED);
945
946 if (zdev->zbus->bus)
947 zpci_bus_remove_device(zdev, false);
948
949 if (zdev_enabled(zdev))
950 zpci_disable_device(zdev);
951
952 if (zdev->has_hp_slot)
953 zpci_exit_slot(zdev);
954
955 if (zdev->has_resources)
956 zpci_cleanup_bus_resources(zdev);
957
958 zpci_bus_device_unregister(zdev);
959 zpci_destroy_iommu(zdev);
960 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
961 kfree_rcu(zdev, rcu);
962}
963
964int zpci_report_error(struct pci_dev *pdev,
965 struct zpci_report_error_header *report)
966{
967 struct zpci_dev *zdev = to_zpci(pdev);
968
969 return sclp_pci_report(report, zdev->fh, zdev->fid);
970}
971EXPORT_SYMBOL(zpci_report_error);
972
973/**
974 * zpci_clear_error_state() - Clears the zPCI error state of the device
975 * @zdev: The zdev for which the zPCI error state should be reset
976 *
977 * Clear the zPCI error state of the device. If clearing the zPCI error state
978 * fails the device is left in the error state. In this case it may make sense
979 * to call zpci_io_perm_failure() on the associated pdev if it exists.
980 *
981 * Returns: 0 on success, -EIO otherwise
982 */
983int zpci_clear_error_state(struct zpci_dev *zdev)
984{
985 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_ERROR);
986 struct zpci_fib fib = {0};
987 u8 status;
988 int cc;
989
990 cc = zpci_mod_fc(req, &fib, &status);
991 if (cc) {
992 zpci_dbg(3, "ces fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
993 return -EIO;
994 }
995
996 return 0;
997}
998
999/**
1000 * zpci_reset_load_store_blocked() - Re-enables L/S from error state
1001 * @zdev: The zdev for which to unblock load/store access
1002 *
1003 * Re-enables load/store access for a PCI function in the error state while
1004 * keeping DMA blocked. In this state drivers can poke MMIO space to determine
1005 * if error recovery is possible while catching any rogue DMA access from the
1006 * device.
1007 *
1008 * Returns: 0 on success, -EIO otherwise
1009 */
1010int zpci_reset_load_store_blocked(struct zpci_dev *zdev)
1011{
1012 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_BLOCK);
1013 struct zpci_fib fib = {0};
1014 u8 status;
1015 int cc;
1016
1017 cc = zpci_mod_fc(req, &fib, &status);
1018 if (cc) {
1019 zpci_dbg(3, "rls fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
1020 return -EIO;
1021 }
1022
1023 return 0;
1024}
1025
1026static int zpci_mem_init(void)
1027{
1028 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
1029 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
1030
1031 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
1032 __alignof__(struct zpci_fmb), 0, NULL);
1033 if (!zdev_fmb_cache)
1034 goto error_fmb;
1035
1036 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
1037 sizeof(*zpci_iomap_start), GFP_KERNEL);
1038 if (!zpci_iomap_start)
1039 goto error_iomap;
1040
1041 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
1042 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
1043 if (!zpci_iomap_bitmap)
1044 goto error_iomap_bitmap;
1045
1046 if (static_branch_likely(&have_mio))
1047 clp_setup_writeback_mio();
1048
1049 return 0;
1050error_iomap_bitmap:
1051 kfree(zpci_iomap_start);
1052error_iomap:
1053 kmem_cache_destroy(zdev_fmb_cache);
1054error_fmb:
1055 return -ENOMEM;
1056}
1057
1058static void zpci_mem_exit(void)
1059{
1060 kfree(zpci_iomap_bitmap);
1061 kfree(zpci_iomap_start);
1062 kmem_cache_destroy(zdev_fmb_cache);
1063}
1064
1065static unsigned int s390_pci_probe __initdata = 1;
1066unsigned int s390_pci_force_floating __initdata;
1067static unsigned int s390_pci_initialized;
1068
1069char * __init pcibios_setup(char *str)
1070{
1071 if (!strcmp(str, "off")) {
1072 s390_pci_probe = 0;
1073 return NULL;
1074 }
1075 if (!strcmp(str, "nomio")) {
1076 get_lowcore()->machine_flags &= ~MACHINE_FLAG_PCI_MIO;
1077 return NULL;
1078 }
1079 if (!strcmp(str, "force_floating")) {
1080 s390_pci_force_floating = 1;
1081 return NULL;
1082 }
1083 if (!strcmp(str, "norid")) {
1084 s390_pci_no_rid = 1;
1085 return NULL;
1086 }
1087 return str;
1088}
1089
1090bool zpci_is_enabled(void)
1091{
1092 return s390_pci_initialized;
1093}
1094
1095static int zpci_cmp_rid(void *priv, const struct list_head *a,
1096 const struct list_head *b)
1097{
1098 struct zpci_dev *za = container_of(a, struct zpci_dev, entry);
1099 struct zpci_dev *zb = container_of(b, struct zpci_dev, entry);
1100
1101 /*
1102 * PCI functions without RID available maintain original order
1103 * between themselves but sort before those with RID.
1104 */
1105 if (za->rid == zb->rid)
1106 return za->rid_available > zb->rid_available;
1107 /*
1108 * PCI functions with RID sort by RID ascending.
1109 */
1110 return za->rid > zb->rid;
1111}
1112
1113static void zpci_add_devices(struct list_head *scan_list)
1114{
1115 struct zpci_dev *zdev, *tmp;
1116
1117 list_sort(NULL, scan_list, &zpci_cmp_rid);
1118 list_for_each_entry_safe(zdev, tmp, scan_list, entry) {
1119 list_del_init(&zdev->entry);
1120 if (zpci_add_device(zdev))
1121 kfree(zdev);
1122 }
1123}
1124
1125int zpci_scan_devices(void)
1126{
1127 LIST_HEAD(scan_list);
1128 int rc;
1129
1130 rc = clp_scan_pci_devices(&scan_list);
1131 if (rc)
1132 return rc;
1133
1134 zpci_add_devices(&scan_list);
1135 zpci_bus_scan_busses();
1136 return 0;
1137}
1138
1139static int __init pci_base_init(void)
1140{
1141 int rc;
1142
1143 if (!s390_pci_probe)
1144 return 0;
1145
1146 if (!test_facility(69) || !test_facility(71)) {
1147 pr_info("PCI is not supported because CPU facilities 69 or 71 are not available\n");
1148 return 0;
1149 }
1150
1151 if (MACHINE_HAS_PCI_MIO) {
1152 static_branch_enable(&have_mio);
1153 system_ctl_set_bit(2, CR2_MIO_ADDRESSING_BIT);
1154 }
1155
1156 rc = zpci_debug_init();
1157 if (rc)
1158 goto out;
1159
1160 rc = zpci_mem_init();
1161 if (rc)
1162 goto out_mem;
1163
1164 rc = zpci_irq_init();
1165 if (rc)
1166 goto out_irq;
1167
1168 rc = zpci_scan_devices();
1169 if (rc)
1170 goto out_find;
1171
1172 s390_pci_initialized = 1;
1173 return 0;
1174
1175out_find:
1176 zpci_irq_exit();
1177out_irq:
1178 zpci_mem_exit();
1179out_mem:
1180 zpci_debug_exit();
1181out:
1182 return rc;
1183}
1184subsys_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/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}