Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2012
4 *
5 * Author(s):
6 * Jan Glauber <jang@linux.vnet.ibm.com>
7 *
8 * The System z PCI code is a rewrite from a prototype by
9 * the following people (Kudoz!):
10 * Alexander Schmidt
11 * Christoph Raisch
12 * Hannes Hering
13 * Hoang-Nam Nguyen
14 * Jan-Bernd Themann
15 * Stefan Roscher
16 * Thomas Klein
17 */
18
19#define KMSG_COMPONENT "zpci"
20#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
21
22#include <linux/kernel.h>
23#include <linux/slab.h>
24#include <linux/err.h>
25#include <linux/export.h>
26#include <linux/delay.h>
27#include <linux/seq_file.h>
28#include <linux/jump_label.h>
29#include <linux/pci.h>
30#include <linux/printk.h>
31
32#include <asm/isc.h>
33#include <asm/airq.h>
34#include <asm/facility.h>
35#include <asm/pci_insn.h>
36#include <asm/pci_clp.h>
37#include <asm/pci_dma.h>
38
39#include "pci_bus.h"
40#include "pci_iov.h"
41
42/* list of all detected zpci devices */
43static LIST_HEAD(zpci_list);
44static DEFINE_SPINLOCK(zpci_list_lock);
45
46static DECLARE_BITMAP(zpci_domain, ZPCI_DOMAIN_BITMAP_SIZE);
47static DEFINE_SPINLOCK(zpci_domain_lock);
48
49#define ZPCI_IOMAP_ENTRIES \
50 min(((unsigned long) ZPCI_NR_DEVICES * PCI_STD_NUM_BARS / 2), \
51 ZPCI_IOMAP_MAX_ENTRIES)
52
53unsigned int s390_pci_no_rid;
54
55static DEFINE_SPINLOCK(zpci_iomap_lock);
56static unsigned long *zpci_iomap_bitmap;
57struct zpci_iomap_entry *zpci_iomap_start;
58EXPORT_SYMBOL_GPL(zpci_iomap_start);
59
60DEFINE_STATIC_KEY_FALSE(have_mio);
61
62static struct kmem_cache *zdev_fmb_cache;
63
64/* AEN structures that must be preserved over KVM module re-insertion */
65union zpci_sic_iib *zpci_aipb;
66EXPORT_SYMBOL_GPL(zpci_aipb);
67struct airq_iv *zpci_aif_sbv;
68EXPORT_SYMBOL_GPL(zpci_aif_sbv);
69
70struct zpci_dev *get_zdev_by_fid(u32 fid)
71{
72 struct zpci_dev *tmp, *zdev = NULL;
73
74 spin_lock(&zpci_list_lock);
75 list_for_each_entry(tmp, &zpci_list, entry) {
76 if (tmp->fid == fid) {
77 zdev = tmp;
78 zpci_zdev_get(zdev);
79 break;
80 }
81 }
82 spin_unlock(&zpci_list_lock);
83 return zdev;
84}
85
86void zpci_remove_reserved_devices(void)
87{
88 struct zpci_dev *tmp, *zdev;
89 enum zpci_state state;
90 LIST_HEAD(remove);
91
92 spin_lock(&zpci_list_lock);
93 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
94 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
95 !clp_get_state(zdev->fid, &state) &&
96 state == ZPCI_FN_STATE_RESERVED)
97 list_move_tail(&zdev->entry, &remove);
98 }
99 spin_unlock(&zpci_list_lock);
100
101 list_for_each_entry_safe(zdev, tmp, &remove, entry)
102 zpci_device_reserved(zdev);
103}
104
105int pci_domain_nr(struct pci_bus *bus)
106{
107 return ((struct zpci_bus *) bus->sysdata)->domain_nr;
108}
109EXPORT_SYMBOL_GPL(pci_domain_nr);
110
111int pci_proc_domain(struct pci_bus *bus)
112{
113 return pci_domain_nr(bus);
114}
115EXPORT_SYMBOL_GPL(pci_proc_domain);
116
117/* Modify PCI: Register I/O address translation parameters */
118int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
119 u64 base, u64 limit, u64 iota, u8 *status)
120{
121 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
122 struct zpci_fib fib = {0};
123 u8 cc;
124
125 WARN_ON_ONCE(iota & 0x3fff);
126 fib.pba = base;
127 fib.pal = limit;
128 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
129 fib.gd = zdev->gisa;
130 cc = zpci_mod_fc(req, &fib, status);
131 if (cc)
132 zpci_dbg(3, "reg ioat fid:%x, cc:%d, status:%d\n", zdev->fid, cc, *status);
133 return cc;
134}
135EXPORT_SYMBOL_GPL(zpci_register_ioat);
136
137/* Modify PCI: Unregister I/O address translation parameters */
138int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
139{
140 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
141 struct zpci_fib fib = {0};
142 u8 cc, status;
143
144 fib.gd = zdev->gisa;
145
146 cc = zpci_mod_fc(req, &fib, &status);
147 if (cc)
148 zpci_dbg(3, "unreg ioat fid:%x, cc:%d, status:%d\n", zdev->fid, cc, status);
149 return cc;
150}
151
152/* Modify PCI: Set PCI function measurement parameters */
153int zpci_fmb_enable_device(struct zpci_dev *zdev)
154{
155 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
156 struct zpci_fib fib = {0};
157 u8 cc, status;
158
159 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
160 return -EINVAL;
161
162 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
163 if (!zdev->fmb)
164 return -ENOMEM;
165 WARN_ON((u64) zdev->fmb & 0xf);
166
167 /* reset software counters */
168 atomic64_set(&zdev->allocated_pages, 0);
169 atomic64_set(&zdev->mapped_pages, 0);
170 atomic64_set(&zdev->unmapped_pages, 0);
171
172 fib.fmb_addr = virt_to_phys(zdev->fmb);
173 fib.gd = zdev->gisa;
174 cc = zpci_mod_fc(req, &fib, &status);
175 if (cc) {
176 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
177 zdev->fmb = NULL;
178 }
179 return cc ? -EIO : 0;
180}
181
182/* Modify PCI: Disable PCI function measurement */
183int zpci_fmb_disable_device(struct zpci_dev *zdev)
184{
185 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
186 struct zpci_fib fib = {0};
187 u8 cc, status;
188
189 if (!zdev->fmb)
190 return -EINVAL;
191
192 fib.gd = zdev->gisa;
193
194 /* Function measurement is disabled if fmb address is zero */
195 cc = zpci_mod_fc(req, &fib, &status);
196 if (cc == 3) /* Function already gone. */
197 cc = 0;
198
199 if (!cc) {
200 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
201 zdev->fmb = NULL;
202 }
203 return cc ? -EIO : 0;
204}
205
206static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
207{
208 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
209 u64 data;
210 int rc;
211
212 rc = __zpci_load(&data, req, offset);
213 if (!rc) {
214 data = le64_to_cpu((__force __le64) data);
215 data >>= (8 - len) * 8;
216 *val = (u32) data;
217 } else
218 *val = 0xffffffff;
219 return rc;
220}
221
222static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
223{
224 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
225 u64 data = val;
226 int rc;
227
228 data <<= (8 - len) * 8;
229 data = (__force u64) cpu_to_le64(data);
230 rc = __zpci_store(data, req, offset);
231 return rc;
232}
233
234resource_size_t pcibios_align_resource(void *data, const struct resource *res,
235 resource_size_t size,
236 resource_size_t align)
237{
238 return 0;
239}
240
241/* combine single writes by using store-block insn */
242void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
243{
244 zpci_memcpy_toio(to, from, count);
245}
246
247static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot)
248{
249 unsigned long offset, vaddr;
250 struct vm_struct *area;
251 phys_addr_t last_addr;
252
253 last_addr = addr + size - 1;
254 if (!size || last_addr < addr)
255 return NULL;
256
257 if (!static_branch_unlikely(&have_mio))
258 return (void __iomem *) addr;
259
260 offset = addr & ~PAGE_MASK;
261 addr &= PAGE_MASK;
262 size = PAGE_ALIGN(size + offset);
263 area = get_vm_area(size, VM_IOREMAP);
264 if (!area)
265 return NULL;
266
267 vaddr = (unsigned long) area->addr;
268 if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
269 free_vm_area(area);
270 return NULL;
271 }
272 return (void __iomem *) ((unsigned long) area->addr + offset);
273}
274
275void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
276{
277 return __ioremap(addr, size, __pgprot(prot));
278}
279EXPORT_SYMBOL(ioremap_prot);
280
281void __iomem *ioremap(phys_addr_t addr, size_t size)
282{
283 return __ioremap(addr, size, PAGE_KERNEL);
284}
285EXPORT_SYMBOL(ioremap);
286
287void __iomem *ioremap_wc(phys_addr_t addr, size_t size)
288{
289 return __ioremap(addr, size, pgprot_writecombine(PAGE_KERNEL));
290}
291EXPORT_SYMBOL(ioremap_wc);
292
293void __iomem *ioremap_wt(phys_addr_t addr, size_t size)
294{
295 return __ioremap(addr, size, pgprot_writethrough(PAGE_KERNEL));
296}
297EXPORT_SYMBOL(ioremap_wt);
298
299void iounmap(volatile void __iomem *addr)
300{
301 if (static_branch_likely(&have_mio))
302 vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
303}
304EXPORT_SYMBOL(iounmap);
305
306/* Create a virtual mapping cookie for a PCI BAR */
307static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
308 unsigned long offset, unsigned long max)
309{
310 struct zpci_dev *zdev = to_zpci(pdev);
311 int idx;
312
313 idx = zdev->bars[bar].map_idx;
314 spin_lock(&zpci_iomap_lock);
315 /* Detect overrun */
316 WARN_ON(!++zpci_iomap_start[idx].count);
317 zpci_iomap_start[idx].fh = zdev->fh;
318 zpci_iomap_start[idx].bar = bar;
319 spin_unlock(&zpci_iomap_lock);
320
321 return (void __iomem *) ZPCI_ADDR(idx) + offset;
322}
323
324static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
325 unsigned long offset,
326 unsigned long max)
327{
328 unsigned long barsize = pci_resource_len(pdev, bar);
329 struct zpci_dev *zdev = to_zpci(pdev);
330 void __iomem *iova;
331
332 iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
333 return iova ? iova + offset : iova;
334}
335
336void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
337 unsigned long offset, unsigned long max)
338{
339 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
340 return NULL;
341
342 if (static_branch_likely(&have_mio))
343 return pci_iomap_range_mio(pdev, bar, offset, max);
344 else
345 return pci_iomap_range_fh(pdev, bar, offset, max);
346}
347EXPORT_SYMBOL(pci_iomap_range);
348
349void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
350{
351 return pci_iomap_range(dev, bar, 0, maxlen);
352}
353EXPORT_SYMBOL(pci_iomap);
354
355static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
356 unsigned long offset, unsigned long max)
357{
358 unsigned long barsize = pci_resource_len(pdev, bar);
359 struct zpci_dev *zdev = to_zpci(pdev);
360 void __iomem *iova;
361
362 iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
363 return iova ? iova + offset : iova;
364}
365
366void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
367 unsigned long offset, unsigned long max)
368{
369 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
370 return NULL;
371
372 if (static_branch_likely(&have_mio))
373 return pci_iomap_wc_range_mio(pdev, bar, offset, max);
374 else
375 return pci_iomap_range_fh(pdev, bar, offset, max);
376}
377EXPORT_SYMBOL(pci_iomap_wc_range);
378
379void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
380{
381 return pci_iomap_wc_range(dev, bar, 0, maxlen);
382}
383EXPORT_SYMBOL(pci_iomap_wc);
384
385static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
386{
387 unsigned int idx = ZPCI_IDX(addr);
388
389 spin_lock(&zpci_iomap_lock);
390 /* Detect underrun */
391 WARN_ON(!zpci_iomap_start[idx].count);
392 if (!--zpci_iomap_start[idx].count) {
393 zpci_iomap_start[idx].fh = 0;
394 zpci_iomap_start[idx].bar = 0;
395 }
396 spin_unlock(&zpci_iomap_lock);
397}
398
399static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
400{
401 iounmap(addr);
402}
403
404void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
405{
406 if (static_branch_likely(&have_mio))
407 pci_iounmap_mio(pdev, addr);
408 else
409 pci_iounmap_fh(pdev, addr);
410}
411EXPORT_SYMBOL(pci_iounmap);
412
413static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
414 int size, u32 *val)
415{
416 struct zpci_dev *zdev = zdev_from_bus(bus, devfn);
417
418 return (zdev) ? zpci_cfg_load(zdev, where, val, size) : -ENODEV;
419}
420
421static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
422 int size, u32 val)
423{
424 struct zpci_dev *zdev = zdev_from_bus(bus, devfn);
425
426 return (zdev) ? zpci_cfg_store(zdev, where, val, size) : -ENODEV;
427}
428
429static struct pci_ops pci_root_ops = {
430 .read = pci_read,
431 .write = pci_write,
432};
433
434static void zpci_map_resources(struct pci_dev *pdev)
435{
436 struct zpci_dev *zdev = to_zpci(pdev);
437 resource_size_t len;
438 int i;
439
440 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
441 len = pci_resource_len(pdev, i);
442 if (!len)
443 continue;
444
445 if (zpci_use_mio(zdev))
446 pdev->resource[i].start =
447 (resource_size_t __force) zdev->bars[i].mio_wt;
448 else
449 pdev->resource[i].start = (resource_size_t __force)
450 pci_iomap_range_fh(pdev, i, 0, 0);
451 pdev->resource[i].end = pdev->resource[i].start + len - 1;
452 }
453
454 zpci_iov_map_resources(pdev);
455}
456
457static void zpci_unmap_resources(struct pci_dev *pdev)
458{
459 struct zpci_dev *zdev = to_zpci(pdev);
460 resource_size_t len;
461 int i;
462
463 if (zpci_use_mio(zdev))
464 return;
465
466 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
467 len = pci_resource_len(pdev, i);
468 if (!len)
469 continue;
470 pci_iounmap_fh(pdev, (void __iomem __force *)
471 pdev->resource[i].start);
472 }
473}
474
475static int zpci_alloc_iomap(struct zpci_dev *zdev)
476{
477 unsigned long entry;
478
479 spin_lock(&zpci_iomap_lock);
480 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
481 if (entry == ZPCI_IOMAP_ENTRIES) {
482 spin_unlock(&zpci_iomap_lock);
483 return -ENOSPC;
484 }
485 set_bit(entry, zpci_iomap_bitmap);
486 spin_unlock(&zpci_iomap_lock);
487 return entry;
488}
489
490static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
491{
492 spin_lock(&zpci_iomap_lock);
493 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
494 clear_bit(entry, zpci_iomap_bitmap);
495 spin_unlock(&zpci_iomap_lock);
496}
497
498static void zpci_do_update_iomap_fh(struct zpci_dev *zdev, u32 fh)
499{
500 int bar, idx;
501
502 spin_lock(&zpci_iomap_lock);
503 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
504 if (!zdev->bars[bar].size)
505 continue;
506 idx = zdev->bars[bar].map_idx;
507 if (!zpci_iomap_start[idx].count)
508 continue;
509 WRITE_ONCE(zpci_iomap_start[idx].fh, zdev->fh);
510 }
511 spin_unlock(&zpci_iomap_lock);
512}
513
514void zpci_update_fh(struct zpci_dev *zdev, u32 fh)
515{
516 if (!fh || zdev->fh == fh)
517 return;
518
519 zdev->fh = fh;
520 if (zpci_use_mio(zdev))
521 return;
522 if (zdev->has_resources && zdev_enabled(zdev))
523 zpci_do_update_iomap_fh(zdev, fh);
524}
525
526static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
527 unsigned long size, unsigned long flags)
528{
529 struct resource *r;
530
531 r = kzalloc(sizeof(*r), GFP_KERNEL);
532 if (!r)
533 return NULL;
534
535 r->start = start;
536 r->end = r->start + size - 1;
537 r->flags = flags;
538 r->name = zdev->res_name;
539
540 if (request_resource(&iomem_resource, r)) {
541 kfree(r);
542 return NULL;
543 }
544 return r;
545}
546
547int zpci_setup_bus_resources(struct zpci_dev *zdev,
548 struct list_head *resources)
549{
550 unsigned long addr, size, flags;
551 struct resource *res;
552 int i, entry;
553
554 snprintf(zdev->res_name, sizeof(zdev->res_name),
555 "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR);
556
557 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
558 if (!zdev->bars[i].size)
559 continue;
560 entry = zpci_alloc_iomap(zdev);
561 if (entry < 0)
562 return entry;
563 zdev->bars[i].map_idx = entry;
564
565 /* only MMIO is supported */
566 flags = IORESOURCE_MEM;
567 if (zdev->bars[i].val & 8)
568 flags |= IORESOURCE_PREFETCH;
569 if (zdev->bars[i].val & 4)
570 flags |= IORESOURCE_MEM_64;
571
572 if (zpci_use_mio(zdev))
573 addr = (unsigned long) zdev->bars[i].mio_wt;
574 else
575 addr = ZPCI_ADDR(entry);
576 size = 1UL << zdev->bars[i].size;
577
578 res = __alloc_res(zdev, addr, size, flags);
579 if (!res) {
580 zpci_free_iomap(zdev, entry);
581 return -ENOMEM;
582 }
583 zdev->bars[i].res = res;
584 pci_add_resource(resources, res);
585 }
586 zdev->has_resources = 1;
587
588 return 0;
589}
590
591static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
592{
593 int i;
594
595 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
596 if (!zdev->bars[i].size || !zdev->bars[i].res)
597 continue;
598
599 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
600 release_resource(zdev->bars[i].res);
601 kfree(zdev->bars[i].res);
602 }
603 zdev->has_resources = 0;
604}
605
606int pcibios_device_add(struct pci_dev *pdev)
607{
608 struct zpci_dev *zdev = to_zpci(pdev);
609 struct resource *res;
610 int i;
611
612 /* The pdev has a reference to the zdev via its bus */
613 zpci_zdev_get(zdev);
614 if (pdev->is_physfn)
615 pdev->no_vf_scan = 1;
616
617 pdev->dev.groups = zpci_attr_groups;
618 pdev->dev.dma_ops = &s390_pci_dma_ops;
619 zpci_map_resources(pdev);
620
621 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
622 res = &pdev->resource[i];
623 if (res->parent || !res->flags)
624 continue;
625 pci_claim_resource(pdev, i);
626 }
627
628 return 0;
629}
630
631void pcibios_release_device(struct pci_dev *pdev)
632{
633 struct zpci_dev *zdev = to_zpci(pdev);
634
635 zpci_unmap_resources(pdev);
636 zpci_zdev_put(zdev);
637}
638
639int pcibios_enable_device(struct pci_dev *pdev, int mask)
640{
641 struct zpci_dev *zdev = to_zpci(pdev);
642
643 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
644 zpci_fmb_enable_device(zdev);
645
646 return pci_enable_resources(pdev, mask);
647}
648
649void pcibios_disable_device(struct pci_dev *pdev)
650{
651 struct zpci_dev *zdev = to_zpci(pdev);
652
653 zpci_fmb_disable_device(zdev);
654 zpci_debug_exit_device(zdev);
655}
656
657static int __zpci_register_domain(int domain)
658{
659 spin_lock(&zpci_domain_lock);
660 if (test_bit(domain, zpci_domain)) {
661 spin_unlock(&zpci_domain_lock);
662 pr_err("Domain %04x is already assigned\n", domain);
663 return -EEXIST;
664 }
665 set_bit(domain, zpci_domain);
666 spin_unlock(&zpci_domain_lock);
667 return domain;
668}
669
670static int __zpci_alloc_domain(void)
671{
672 int domain;
673
674 spin_lock(&zpci_domain_lock);
675 /*
676 * We can always auto allocate domains below ZPCI_NR_DEVICES.
677 * There is either a free domain or we have reached the maximum in
678 * which case we would have bailed earlier.
679 */
680 domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
681 set_bit(domain, zpci_domain);
682 spin_unlock(&zpci_domain_lock);
683 return domain;
684}
685
686int zpci_alloc_domain(int domain)
687{
688 if (zpci_unique_uid) {
689 if (domain)
690 return __zpci_register_domain(domain);
691 pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n");
692 update_uid_checking(false);
693 }
694 return __zpci_alloc_domain();
695}
696
697void zpci_free_domain(int domain)
698{
699 spin_lock(&zpci_domain_lock);
700 clear_bit(domain, zpci_domain);
701 spin_unlock(&zpci_domain_lock);
702}
703
704
705int zpci_enable_device(struct zpci_dev *zdev)
706{
707 u32 fh = zdev->fh;
708 int rc = 0;
709
710 if (clp_enable_fh(zdev, &fh, ZPCI_NR_DMA_SPACES))
711 rc = -EIO;
712 else
713 zpci_update_fh(zdev, fh);
714 return rc;
715}
716EXPORT_SYMBOL_GPL(zpci_enable_device);
717
718int zpci_disable_device(struct zpci_dev *zdev)
719{
720 u32 fh = zdev->fh;
721 int cc, rc = 0;
722
723 cc = clp_disable_fh(zdev, &fh);
724 if (!cc) {
725 zpci_update_fh(zdev, fh);
726 } else if (cc == CLP_RC_SETPCIFN_ALRDY) {
727 pr_info("Disabling PCI function %08x had no effect as it was already disabled\n",
728 zdev->fid);
729 /* Function is already disabled - update handle */
730 rc = clp_refresh_fh(zdev->fid, &fh);
731 if (!rc) {
732 zpci_update_fh(zdev, fh);
733 rc = -EINVAL;
734 }
735 } else {
736 rc = -EIO;
737 }
738 return rc;
739}
740EXPORT_SYMBOL_GPL(zpci_disable_device);
741
742/**
743 * zpci_hot_reset_device - perform a reset of the given zPCI function
744 * @zdev: the slot which should be reset
745 *
746 * Performs a low level reset of the zPCI function. The reset is low level in
747 * the sense that the zPCI function can be reset without detaching it from the
748 * common PCI subsystem. The reset may be performed while under control of
749 * either DMA or IOMMU APIs in which case the existing DMA/IOMMU translation
750 * table is reinstated at the end of the reset.
751 *
752 * After the reset the functions internal state is reset to an initial state
753 * equivalent to its state during boot when first probing a driver.
754 * Consequently after reset the PCI function requires re-initialization via the
755 * common PCI code including re-enabling IRQs via pci_alloc_irq_vectors()
756 * and enabling the function via e.g.pci_enablde_device_flags().The caller
757 * must guard against concurrent reset attempts.
758 *
759 * In most cases this function should not be called directly but through
760 * pci_reset_function() or pci_reset_bus() which handle the save/restore and
761 * locking.
762 *
763 * Return: 0 on success and an error value otherwise
764 */
765int zpci_hot_reset_device(struct zpci_dev *zdev)
766{
767 u8 status;
768 int rc;
769
770 zpci_dbg(3, "rst fid:%x, fh:%x\n", zdev->fid, zdev->fh);
771 if (zdev_enabled(zdev)) {
772 /* Disables device access, DMAs and IRQs (reset state) */
773 rc = zpci_disable_device(zdev);
774 /*
775 * Due to a z/VM vs LPAR inconsistency in the error state the
776 * FH may indicate an enabled device but disable says the
777 * device is already disabled don't treat it as an error here.
778 */
779 if (rc == -EINVAL)
780 rc = 0;
781 if (rc)
782 return rc;
783 }
784
785 rc = zpci_enable_device(zdev);
786 if (rc)
787 return rc;
788
789 if (zdev->dma_table)
790 rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
791 virt_to_phys(zdev->dma_table), &status);
792 else
793 rc = zpci_dma_init_device(zdev);
794 if (rc) {
795 zpci_disable_device(zdev);
796 return rc;
797 }
798
799 return 0;
800}
801
802/**
803 * zpci_create_device() - Create a new zpci_dev and add it to the zbus
804 * @fid: Function ID of the device to be created
805 * @fh: Current Function Handle of the device to be created
806 * @state: Initial state after creation either Standby or Configured
807 *
808 * Creates a new zpci device and adds it to its, possibly newly created, zbus
809 * as well as zpci_list.
810 *
811 * Returns: the zdev on success or an error pointer otherwise
812 */
813struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state)
814{
815 struct zpci_dev *zdev;
816 int rc;
817
818 zpci_dbg(1, "add fid:%x, fh:%x, c:%d\n", fid, fh, state);
819 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
820 if (!zdev)
821 return ERR_PTR(-ENOMEM);
822
823 /* FID and Function Handle are the static/dynamic identifiers */
824 zdev->fid = fid;
825 zdev->fh = fh;
826
827 /* Query function properties and update zdev */
828 rc = clp_query_pci_fn(zdev);
829 if (rc)
830 goto error;
831 zdev->state = state;
832
833 kref_init(&zdev->kref);
834 mutex_init(&zdev->lock);
835 mutex_init(&zdev->kzdev_lock);
836
837 rc = zpci_init_iommu(zdev);
838 if (rc)
839 goto error;
840
841 rc = zpci_bus_device_register(zdev, &pci_root_ops);
842 if (rc)
843 goto error_destroy_iommu;
844
845 spin_lock(&zpci_list_lock);
846 list_add_tail(&zdev->entry, &zpci_list);
847 spin_unlock(&zpci_list_lock);
848
849 return zdev;
850
851error_destroy_iommu:
852 zpci_destroy_iommu(zdev);
853error:
854 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
855 kfree(zdev);
856 return ERR_PTR(rc);
857}
858
859bool zpci_is_device_configured(struct zpci_dev *zdev)
860{
861 enum zpci_state state = zdev->state;
862
863 return state != ZPCI_FN_STATE_RESERVED &&
864 state != ZPCI_FN_STATE_STANDBY;
865}
866
867/**
868 * zpci_scan_configured_device() - Scan a freshly configured zpci_dev
869 * @zdev: The zpci_dev to be configured
870 * @fh: The general function handle supplied by the platform
871 *
872 * Given a device in the configuration state Configured, enables, scans and
873 * adds it to the common code PCI subsystem if possible. If the PCI device is
874 * parked because we can not yet create a PCI bus because we have not seen
875 * function 0, it is ignored but will be scanned once function 0 appears.
876 * If any failure occurs, the zpci_dev is left disabled.
877 *
878 * Return: 0 on success, or an error code otherwise
879 */
880int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh)
881{
882 int rc;
883
884 zpci_update_fh(zdev, fh);
885 /* the PCI function will be scanned once function 0 appears */
886 if (!zdev->zbus->bus)
887 return 0;
888
889 /* For function 0 on a multi-function bus scan whole bus as we might
890 * have to pick up existing functions waiting for it to allow creating
891 * the PCI bus
892 */
893 if (zdev->devfn == 0 && zdev->zbus->multifunction)
894 rc = zpci_bus_scan_bus(zdev->zbus);
895 else
896 rc = zpci_bus_scan_device(zdev);
897
898 return rc;
899}
900
901/**
902 * zpci_deconfigure_device() - Deconfigure a zpci_dev
903 * @zdev: The zpci_dev to configure
904 *
905 * Deconfigure a zPCI function that is currently configured and possibly known
906 * to the common code PCI subsystem.
907 * If any failure occurs the device is left as is.
908 *
909 * Return: 0 on success, or an error code otherwise
910 */
911int zpci_deconfigure_device(struct zpci_dev *zdev)
912{
913 int rc;
914
915 if (zdev->zbus->bus)
916 zpci_bus_remove_device(zdev, false);
917
918 if (zdev->dma_table) {
919 rc = zpci_dma_exit_device(zdev);
920 if (rc)
921 return rc;
922 }
923 if (zdev_enabled(zdev)) {
924 rc = zpci_disable_device(zdev);
925 if (rc)
926 return rc;
927 }
928
929 rc = sclp_pci_deconfigure(zdev->fid);
930 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, rc);
931 if (rc)
932 return rc;
933 zdev->state = ZPCI_FN_STATE_STANDBY;
934
935 return 0;
936}
937
938/**
939 * zpci_device_reserved() - Mark device as resverved
940 * @zdev: the zpci_dev that was reserved
941 *
942 * Handle the case that a given zPCI function was reserved by another system.
943 * After a call to this function the zpci_dev can not be found via
944 * get_zdev_by_fid() anymore but may still be accessible via existing
945 * references though it will not be functional anymore.
946 */
947void zpci_device_reserved(struct zpci_dev *zdev)
948{
949 if (zdev->has_hp_slot)
950 zpci_exit_slot(zdev);
951 /*
952 * Remove device from zpci_list as it is going away. This also
953 * makes sure we ignore subsequent zPCI events for this device.
954 */
955 spin_lock(&zpci_list_lock);
956 list_del(&zdev->entry);
957 spin_unlock(&zpci_list_lock);
958 zdev->state = ZPCI_FN_STATE_RESERVED;
959 zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
960 zpci_zdev_put(zdev);
961}
962
963void zpci_release_device(struct kref *kref)
964{
965 struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref);
966 int ret;
967
968 if (zdev->zbus->bus)
969 zpci_bus_remove_device(zdev, false);
970
971 if (zdev->dma_table)
972 zpci_dma_exit_device(zdev);
973 if (zdev_enabled(zdev))
974 zpci_disable_device(zdev);
975
976 switch (zdev->state) {
977 case ZPCI_FN_STATE_CONFIGURED:
978 ret = sclp_pci_deconfigure(zdev->fid);
979 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
980 fallthrough;
981 case ZPCI_FN_STATE_STANDBY:
982 if (zdev->has_hp_slot)
983 zpci_exit_slot(zdev);
984 spin_lock(&zpci_list_lock);
985 list_del(&zdev->entry);
986 spin_unlock(&zpci_list_lock);
987 zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
988 fallthrough;
989 case ZPCI_FN_STATE_RESERVED:
990 if (zdev->has_resources)
991 zpci_cleanup_bus_resources(zdev);
992 zpci_bus_device_unregister(zdev);
993 zpci_destroy_iommu(zdev);
994 fallthrough;
995 default:
996 break;
997 }
998 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
999 kfree_rcu(zdev, rcu);
1000}
1001
1002int zpci_report_error(struct pci_dev *pdev,
1003 struct zpci_report_error_header *report)
1004{
1005 struct zpci_dev *zdev = to_zpci(pdev);
1006
1007 return sclp_pci_report(report, zdev->fh, zdev->fid);
1008}
1009EXPORT_SYMBOL(zpci_report_error);
1010
1011/**
1012 * zpci_clear_error_state() - Clears the zPCI error state of the device
1013 * @zdev: The zdev for which the zPCI error state should be reset
1014 *
1015 * Clear the zPCI error state of the device. If clearing the zPCI error state
1016 * fails the device is left in the error state. In this case it may make sense
1017 * to call zpci_io_perm_failure() on the associated pdev if it exists.
1018 *
1019 * Returns: 0 on success, -EIO otherwise
1020 */
1021int zpci_clear_error_state(struct zpci_dev *zdev)
1022{
1023 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_ERROR);
1024 struct zpci_fib fib = {0};
1025 u8 status;
1026 int cc;
1027
1028 cc = zpci_mod_fc(req, &fib, &status);
1029 if (cc) {
1030 zpci_dbg(3, "ces fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
1031 return -EIO;
1032 }
1033
1034 return 0;
1035}
1036
1037/**
1038 * zpci_reset_load_store_blocked() - Re-enables L/S from error state
1039 * @zdev: The zdev for which to unblock load/store access
1040 *
1041 * Re-enables load/store access for a PCI function in the error state while
1042 * keeping DMA blocked. In this state drivers can poke MMIO space to determine
1043 * if error recovery is possible while catching any rogue DMA access from the
1044 * device.
1045 *
1046 * Returns: 0 on success, -EIO otherwise
1047 */
1048int zpci_reset_load_store_blocked(struct zpci_dev *zdev)
1049{
1050 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_BLOCK);
1051 struct zpci_fib fib = {0};
1052 u8 status;
1053 int cc;
1054
1055 cc = zpci_mod_fc(req, &fib, &status);
1056 if (cc) {
1057 zpci_dbg(3, "rls fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
1058 return -EIO;
1059 }
1060
1061 return 0;
1062}
1063
1064static int zpci_mem_init(void)
1065{
1066 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
1067 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
1068
1069 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
1070 __alignof__(struct zpci_fmb), 0, NULL);
1071 if (!zdev_fmb_cache)
1072 goto error_fmb;
1073
1074 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
1075 sizeof(*zpci_iomap_start), GFP_KERNEL);
1076 if (!zpci_iomap_start)
1077 goto error_iomap;
1078
1079 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
1080 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
1081 if (!zpci_iomap_bitmap)
1082 goto error_iomap_bitmap;
1083
1084 if (static_branch_likely(&have_mio))
1085 clp_setup_writeback_mio();
1086
1087 return 0;
1088error_iomap_bitmap:
1089 kfree(zpci_iomap_start);
1090error_iomap:
1091 kmem_cache_destroy(zdev_fmb_cache);
1092error_fmb:
1093 return -ENOMEM;
1094}
1095
1096static void zpci_mem_exit(void)
1097{
1098 kfree(zpci_iomap_bitmap);
1099 kfree(zpci_iomap_start);
1100 kmem_cache_destroy(zdev_fmb_cache);
1101}
1102
1103static unsigned int s390_pci_probe __initdata = 1;
1104unsigned int s390_pci_force_floating __initdata;
1105static unsigned int s390_pci_initialized;
1106
1107char * __init pcibios_setup(char *str)
1108{
1109 if (!strcmp(str, "off")) {
1110 s390_pci_probe = 0;
1111 return NULL;
1112 }
1113 if (!strcmp(str, "nomio")) {
1114 S390_lowcore.machine_flags &= ~MACHINE_FLAG_PCI_MIO;
1115 return NULL;
1116 }
1117 if (!strcmp(str, "force_floating")) {
1118 s390_pci_force_floating = 1;
1119 return NULL;
1120 }
1121 if (!strcmp(str, "norid")) {
1122 s390_pci_no_rid = 1;
1123 return NULL;
1124 }
1125 return str;
1126}
1127
1128bool zpci_is_enabled(void)
1129{
1130 return s390_pci_initialized;
1131}
1132
1133static int __init pci_base_init(void)
1134{
1135 int rc;
1136
1137 if (!s390_pci_probe)
1138 return 0;
1139
1140 if (!test_facility(69) || !test_facility(71)) {
1141 pr_info("PCI is not supported because CPU facilities 69 or 71 are not available\n");
1142 return 0;
1143 }
1144
1145 if (MACHINE_HAS_PCI_MIO) {
1146 static_branch_enable(&have_mio);
1147 ctl_set_bit(2, 5);
1148 }
1149
1150 rc = zpci_debug_init();
1151 if (rc)
1152 goto out;
1153
1154 rc = zpci_mem_init();
1155 if (rc)
1156 goto out_mem;
1157
1158 rc = zpci_irq_init();
1159 if (rc)
1160 goto out_irq;
1161
1162 rc = zpci_dma_init();
1163 if (rc)
1164 goto out_dma;
1165
1166 rc = clp_scan_pci_devices();
1167 if (rc)
1168 goto out_find;
1169 zpci_bus_scan_busses();
1170
1171 s390_pci_initialized = 1;
1172 return 0;
1173
1174out_find:
1175 zpci_dma_exit();
1176out_dma:
1177 zpci_irq_exit();
1178out_irq:
1179 zpci_mem_exit();
1180out_mem:
1181 zpci_debug_exit();
1182out:
1183 return rc;
1184}
1185subsys_initcall_sync(pci_base_init);
1/*
2 * Copyright IBM Corp. 2012
3 *
4 * Author(s):
5 * Jan Glauber <jang@linux.vnet.ibm.com>
6 *
7 * The System z PCI code is a rewrite from a prototype by
8 * the following people (Kudoz!):
9 * Alexander Schmidt
10 * Christoph Raisch
11 * Hannes Hering
12 * Hoang-Nam Nguyen
13 * Jan-Bernd Themann
14 * Stefan Roscher
15 * Thomas Klein
16 */
17
18#define KMSG_COMPONENT "zpci"
19#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
20
21#include <linux/kernel.h>
22#include <linux/slab.h>
23#include <linux/err.h>
24#include <linux/export.h>
25#include <linux/delay.h>
26#include <linux/irq.h>
27#include <linux/kernel_stat.h>
28#include <linux/seq_file.h>
29#include <linux/pci.h>
30#include <linux/msi.h>
31
32#include <asm/isc.h>
33#include <asm/airq.h>
34#include <asm/facility.h>
35#include <asm/pci_insn.h>
36#include <asm/pci_clp.h>
37#include <asm/pci_dma.h>
38
39#define DEBUG /* enable pr_debug */
40
41#define SIC_IRQ_MODE_ALL 0
42#define SIC_IRQ_MODE_SINGLE 1
43
44#define ZPCI_NR_DMA_SPACES 1
45#define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
46
47/* list of all detected zpci devices */
48static LIST_HEAD(zpci_list);
49static DEFINE_SPINLOCK(zpci_list_lock);
50
51static struct irq_chip zpci_irq_chip = {
52 .name = "zPCI",
53 .irq_unmask = pci_msi_unmask_irq,
54 .irq_mask = pci_msi_mask_irq,
55};
56
57static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
58static DEFINE_SPINLOCK(zpci_domain_lock);
59
60static struct airq_iv *zpci_aisb_iv;
61static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];
62
63/* Adapter interrupt definitions */
64static void zpci_irq_handler(struct airq_struct *airq);
65
66static struct airq_struct zpci_airq = {
67 .handler = zpci_irq_handler,
68 .isc = PCI_ISC,
69};
70
71#define ZPCI_IOMAP_ENTRIES \
72 min(((unsigned long) CONFIG_PCI_NR_FUNCTIONS * PCI_BAR_COUNT), \
73 ZPCI_IOMAP_MAX_ENTRIES)
74
75static DEFINE_SPINLOCK(zpci_iomap_lock);
76static unsigned long *zpci_iomap_bitmap;
77struct zpci_iomap_entry *zpci_iomap_start;
78EXPORT_SYMBOL_GPL(zpci_iomap_start);
79
80static struct kmem_cache *zdev_fmb_cache;
81
82struct zpci_dev *get_zdev_by_fid(u32 fid)
83{
84 struct zpci_dev *tmp, *zdev = NULL;
85
86 spin_lock(&zpci_list_lock);
87 list_for_each_entry(tmp, &zpci_list, entry) {
88 if (tmp->fid == fid) {
89 zdev = tmp;
90 break;
91 }
92 }
93 spin_unlock(&zpci_list_lock);
94 return zdev;
95}
96
97static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
98{
99 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
100}
101
102int pci_domain_nr(struct pci_bus *bus)
103{
104 return ((struct zpci_dev *) bus->sysdata)->domain;
105}
106EXPORT_SYMBOL_GPL(pci_domain_nr);
107
108int pci_proc_domain(struct pci_bus *bus)
109{
110 return pci_domain_nr(bus);
111}
112EXPORT_SYMBOL_GPL(pci_proc_domain);
113
114/* Modify PCI: Register adapter interruptions */
115static int zpci_set_airq(struct zpci_dev *zdev)
116{
117 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
118 struct zpci_fib fib = {0};
119
120 fib.isc = PCI_ISC;
121 fib.sum = 1; /* enable summary notifications */
122 fib.noi = airq_iv_end(zdev->aibv);
123 fib.aibv = (unsigned long) zdev->aibv->vector;
124 fib.aibvo = 0; /* each zdev has its own interrupt vector */
125 fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
126 fib.aisbo = zdev->aisb & 63;
127
128 return zpci_mod_fc(req, &fib);
129}
130
131struct mod_pci_args {
132 u64 base;
133 u64 limit;
134 u64 iota;
135 u64 fmb_addr;
136};
137
138static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
139{
140 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
141 struct zpci_fib fib = {0};
142
143 fib.pba = args->base;
144 fib.pal = args->limit;
145 fib.iota = args->iota;
146 fib.fmb_addr = args->fmb_addr;
147
148 return zpci_mod_fc(req, &fib);
149}
150
151/* Modify PCI: Register I/O address translation parameters */
152int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
153 u64 base, u64 limit, u64 iota)
154{
155 struct mod_pci_args args = { base, limit, iota, 0 };
156
157 WARN_ON_ONCE(iota & 0x3fff);
158 args.iota |= ZPCI_IOTA_RTTO_FLAG;
159 return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
160}
161
162/* Modify PCI: Unregister I/O address translation parameters */
163int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
164{
165 struct mod_pci_args args = { 0, 0, 0, 0 };
166
167 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
168}
169
170/* Modify PCI: Unregister adapter interruptions */
171static int zpci_clear_airq(struct zpci_dev *zdev)
172{
173 struct mod_pci_args args = { 0, 0, 0, 0 };
174
175 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args);
176}
177
178/* Modify PCI: Set PCI function measurement parameters */
179int zpci_fmb_enable_device(struct zpci_dev *zdev)
180{
181 struct mod_pci_args args = { 0, 0, 0, 0 };
182
183 if (zdev->fmb)
184 return -EINVAL;
185
186 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
187 if (!zdev->fmb)
188 return -ENOMEM;
189 WARN_ON((u64) zdev->fmb & 0xf);
190
191 /* reset software counters */
192 atomic64_set(&zdev->allocated_pages, 0);
193 atomic64_set(&zdev->mapped_pages, 0);
194 atomic64_set(&zdev->unmapped_pages, 0);
195
196 args.fmb_addr = virt_to_phys(zdev->fmb);
197 return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
198}
199
200/* Modify PCI: Disable PCI function measurement */
201int zpci_fmb_disable_device(struct zpci_dev *zdev)
202{
203 struct mod_pci_args args = { 0, 0, 0, 0 };
204 int rc;
205
206 if (!zdev->fmb)
207 return -EINVAL;
208
209 /* Function measurement is disabled if fmb address is zero */
210 rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
211
212 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
213 zdev->fmb = NULL;
214 return rc;
215}
216
217#define ZPCI_PCIAS_CFGSPC 15
218
219static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
220{
221 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
222 u64 data;
223 int rc;
224
225 rc = zpci_load(&data, req, offset);
226 if (!rc) {
227 data = data << ((8 - len) * 8);
228 data = le64_to_cpu(data);
229 *val = (u32) data;
230 } else
231 *val = 0xffffffff;
232 return rc;
233}
234
235static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
236{
237 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
238 u64 data = val;
239 int rc;
240
241 data = cpu_to_le64(data);
242 data = data >> ((8 - len) * 8);
243 rc = zpci_store(data, req, offset);
244 return rc;
245}
246
247void pcibios_fixup_bus(struct pci_bus *bus)
248{
249}
250
251resource_size_t pcibios_align_resource(void *data, const struct resource *res,
252 resource_size_t size,
253 resource_size_t align)
254{
255 return 0;
256}
257
258/* combine single writes by using store-block insn */
259void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
260{
261 zpci_memcpy_toio(to, from, count);
262}
263
264/* Create a virtual mapping cookie for a PCI BAR */
265void __iomem *pci_iomap_range(struct pci_dev *pdev,
266 int bar,
267 unsigned long offset,
268 unsigned long max)
269{
270 struct zpci_dev *zdev = to_zpci(pdev);
271 int idx;
272
273 if (!pci_resource_len(pdev, bar))
274 return NULL;
275
276 idx = zdev->bars[bar].map_idx;
277 spin_lock(&zpci_iomap_lock);
278 /* Detect overrun */
279 WARN_ON(!++zpci_iomap_start[idx].count);
280 zpci_iomap_start[idx].fh = zdev->fh;
281 zpci_iomap_start[idx].bar = bar;
282 spin_unlock(&zpci_iomap_lock);
283
284 return (void __iomem *) ZPCI_ADDR(idx) + offset;
285}
286EXPORT_SYMBOL(pci_iomap_range);
287
288void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
289{
290 return pci_iomap_range(dev, bar, 0, maxlen);
291}
292EXPORT_SYMBOL(pci_iomap);
293
294void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
295{
296 unsigned int idx = ZPCI_IDX(addr);
297
298 spin_lock(&zpci_iomap_lock);
299 /* Detect underrun */
300 WARN_ON(!zpci_iomap_start[idx].count);
301 if (!--zpci_iomap_start[idx].count) {
302 zpci_iomap_start[idx].fh = 0;
303 zpci_iomap_start[idx].bar = 0;
304 }
305 spin_unlock(&zpci_iomap_lock);
306}
307EXPORT_SYMBOL(pci_iounmap);
308
309static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
310 int size, u32 *val)
311{
312 struct zpci_dev *zdev = get_zdev_by_bus(bus);
313 int ret;
314
315 if (!zdev || devfn != ZPCI_DEVFN)
316 ret = -ENODEV;
317 else
318 ret = zpci_cfg_load(zdev, where, val, size);
319
320 return ret;
321}
322
323static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
324 int size, u32 val)
325{
326 struct zpci_dev *zdev = get_zdev_by_bus(bus);
327 int ret;
328
329 if (!zdev || devfn != ZPCI_DEVFN)
330 ret = -ENODEV;
331 else
332 ret = zpci_cfg_store(zdev, where, val, size);
333
334 return ret;
335}
336
337static struct pci_ops pci_root_ops = {
338 .read = pci_read,
339 .write = pci_write,
340};
341
342static void zpci_irq_handler(struct airq_struct *airq)
343{
344 unsigned long si, ai;
345 struct airq_iv *aibv;
346 int irqs_on = 0;
347
348 inc_irq_stat(IRQIO_PCI);
349 for (si = 0;;) {
350 /* Scan adapter summary indicator bit vector */
351 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
352 if (si == -1UL) {
353 if (irqs_on++)
354 /* End of second scan with interrupts on. */
355 break;
356 /* First scan complete, reenable interrupts. */
357 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
358 si = 0;
359 continue;
360 }
361
362 /* Scan the adapter interrupt vector for this device. */
363 aibv = zpci_aibv[si];
364 for (ai = 0;;) {
365 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
366 if (ai == -1UL)
367 break;
368 inc_irq_stat(IRQIO_MSI);
369 airq_iv_lock(aibv, ai);
370 generic_handle_irq(airq_iv_get_data(aibv, ai));
371 airq_iv_unlock(aibv, ai);
372 }
373 }
374}
375
376int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
377{
378 struct zpci_dev *zdev = to_zpci(pdev);
379 unsigned int hwirq, msi_vecs;
380 unsigned long aisb;
381 struct msi_desc *msi;
382 struct msi_msg msg;
383 int rc, irq;
384
385 if (type == PCI_CAP_ID_MSI && nvec > 1)
386 return 1;
387 msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
388
389 /* Allocate adapter summary indicator bit */
390 rc = -EIO;
391 aisb = airq_iv_alloc_bit(zpci_aisb_iv);
392 if (aisb == -1UL)
393 goto out;
394 zdev->aisb = aisb;
395
396 /* Create adapter interrupt vector */
397 rc = -ENOMEM;
398 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
399 if (!zdev->aibv)
400 goto out_si;
401
402 /* Wire up shortcut pointer */
403 zpci_aibv[aisb] = zdev->aibv;
404
405 /* Request MSI interrupts */
406 hwirq = 0;
407 for_each_pci_msi_entry(msi, pdev) {
408 rc = -EIO;
409 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */
410 if (irq < 0)
411 goto out_msi;
412 rc = irq_set_msi_desc(irq, msi);
413 if (rc)
414 goto out_msi;
415 irq_set_chip_and_handler(irq, &zpci_irq_chip,
416 handle_simple_irq);
417 msg.data = hwirq;
418 msg.address_lo = zdev->msi_addr & 0xffffffff;
419 msg.address_hi = zdev->msi_addr >> 32;
420 pci_write_msi_msg(irq, &msg);
421 airq_iv_set_data(zdev->aibv, hwirq, irq);
422 hwirq++;
423 }
424
425 /* Enable adapter interrupts */
426 rc = zpci_set_airq(zdev);
427 if (rc)
428 goto out_msi;
429
430 return (msi_vecs == nvec) ? 0 : msi_vecs;
431
432out_msi:
433 for_each_pci_msi_entry(msi, pdev) {
434 if (hwirq-- == 0)
435 break;
436 irq_set_msi_desc(msi->irq, NULL);
437 irq_free_desc(msi->irq);
438 msi->msg.address_lo = 0;
439 msi->msg.address_hi = 0;
440 msi->msg.data = 0;
441 msi->irq = 0;
442 }
443 zpci_aibv[aisb] = NULL;
444 airq_iv_release(zdev->aibv);
445out_si:
446 airq_iv_free_bit(zpci_aisb_iv, aisb);
447out:
448 return rc;
449}
450
451void arch_teardown_msi_irqs(struct pci_dev *pdev)
452{
453 struct zpci_dev *zdev = to_zpci(pdev);
454 struct msi_desc *msi;
455 int rc;
456
457 /* Disable adapter interrupts */
458 rc = zpci_clear_airq(zdev);
459 if (rc)
460 return;
461
462 /* Release MSI interrupts */
463 for_each_pci_msi_entry(msi, pdev) {
464 if (msi->msi_attrib.is_msix)
465 __pci_msix_desc_mask_irq(msi, 1);
466 else
467 __pci_msi_desc_mask_irq(msi, 1, 1);
468 irq_set_msi_desc(msi->irq, NULL);
469 irq_free_desc(msi->irq);
470 msi->msg.address_lo = 0;
471 msi->msg.address_hi = 0;
472 msi->msg.data = 0;
473 msi->irq = 0;
474 }
475
476 zpci_aibv[zdev->aisb] = NULL;
477 airq_iv_release(zdev->aibv);
478 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
479}
480
481static void zpci_map_resources(struct pci_dev *pdev)
482{
483 resource_size_t len;
484 int i;
485
486 for (i = 0; i < PCI_BAR_COUNT; i++) {
487 len = pci_resource_len(pdev, i);
488 if (!len)
489 continue;
490 pdev->resource[i].start =
491 (resource_size_t __force) pci_iomap(pdev, i, 0);
492 pdev->resource[i].end = pdev->resource[i].start + len - 1;
493 }
494}
495
496static void zpci_unmap_resources(struct pci_dev *pdev)
497{
498 resource_size_t len;
499 int i;
500
501 for (i = 0; i < PCI_BAR_COUNT; i++) {
502 len = pci_resource_len(pdev, i);
503 if (!len)
504 continue;
505 pci_iounmap(pdev, (void __iomem __force *)
506 pdev->resource[i].start);
507 }
508}
509
510static int __init zpci_irq_init(void)
511{
512 int rc;
513
514 rc = register_adapter_interrupt(&zpci_airq);
515 if (rc)
516 goto out;
517 /* Set summary to 1 to be called every time for the ISC. */
518 *zpci_airq.lsi_ptr = 1;
519
520 rc = -ENOMEM;
521 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
522 if (!zpci_aisb_iv)
523 goto out_airq;
524
525 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
526 return 0;
527
528out_airq:
529 unregister_adapter_interrupt(&zpci_airq);
530out:
531 return rc;
532}
533
534static void zpci_irq_exit(void)
535{
536 airq_iv_release(zpci_aisb_iv);
537 unregister_adapter_interrupt(&zpci_airq);
538}
539
540static int zpci_alloc_iomap(struct zpci_dev *zdev)
541{
542 unsigned long entry;
543
544 spin_lock(&zpci_iomap_lock);
545 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
546 if (entry == ZPCI_IOMAP_ENTRIES) {
547 spin_unlock(&zpci_iomap_lock);
548 return -ENOSPC;
549 }
550 set_bit(entry, zpci_iomap_bitmap);
551 spin_unlock(&zpci_iomap_lock);
552 return entry;
553}
554
555static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
556{
557 spin_lock(&zpci_iomap_lock);
558 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
559 clear_bit(entry, zpci_iomap_bitmap);
560 spin_unlock(&zpci_iomap_lock);
561}
562
563static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
564 unsigned long size, unsigned long flags)
565{
566 struct resource *r;
567
568 r = kzalloc(sizeof(*r), GFP_KERNEL);
569 if (!r)
570 return NULL;
571
572 r->start = start;
573 r->end = r->start + size - 1;
574 r->flags = flags;
575 r->name = zdev->res_name;
576
577 if (request_resource(&iomem_resource, r)) {
578 kfree(r);
579 return NULL;
580 }
581 return r;
582}
583
584static int zpci_setup_bus_resources(struct zpci_dev *zdev,
585 struct list_head *resources)
586{
587 unsigned long addr, size, flags;
588 struct resource *res;
589 int i, entry;
590
591 snprintf(zdev->res_name, sizeof(zdev->res_name),
592 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
593
594 for (i = 0; i < PCI_BAR_COUNT; i++) {
595 if (!zdev->bars[i].size)
596 continue;
597 entry = zpci_alloc_iomap(zdev);
598 if (entry < 0)
599 return entry;
600 zdev->bars[i].map_idx = entry;
601
602 /* only MMIO is supported */
603 flags = IORESOURCE_MEM;
604 if (zdev->bars[i].val & 8)
605 flags |= IORESOURCE_PREFETCH;
606 if (zdev->bars[i].val & 4)
607 flags |= IORESOURCE_MEM_64;
608
609 addr = ZPCI_ADDR(entry);
610 size = 1UL << zdev->bars[i].size;
611
612 res = __alloc_res(zdev, addr, size, flags);
613 if (!res) {
614 zpci_free_iomap(zdev, entry);
615 return -ENOMEM;
616 }
617 zdev->bars[i].res = res;
618 pci_add_resource(resources, res);
619 }
620
621 return 0;
622}
623
624static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
625{
626 int i;
627
628 for (i = 0; i < PCI_BAR_COUNT; i++) {
629 if (!zdev->bars[i].size || !zdev->bars[i].res)
630 continue;
631
632 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
633 release_resource(zdev->bars[i].res);
634 kfree(zdev->bars[i].res);
635 }
636}
637
638int pcibios_add_device(struct pci_dev *pdev)
639{
640 struct resource *res;
641 int i;
642
643 pdev->dev.groups = zpci_attr_groups;
644 pdev->dev.archdata.dma_ops = &s390_pci_dma_ops;
645 zpci_map_resources(pdev);
646
647 for (i = 0; i < PCI_BAR_COUNT; i++) {
648 res = &pdev->resource[i];
649 if (res->parent || !res->flags)
650 continue;
651 pci_claim_resource(pdev, i);
652 }
653
654 return 0;
655}
656
657void pcibios_release_device(struct pci_dev *pdev)
658{
659 zpci_unmap_resources(pdev);
660}
661
662int pcibios_enable_device(struct pci_dev *pdev, int mask)
663{
664 struct zpci_dev *zdev = to_zpci(pdev);
665
666 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
667 zpci_fmb_enable_device(zdev);
668
669 return pci_enable_resources(pdev, mask);
670}
671
672void pcibios_disable_device(struct pci_dev *pdev)
673{
674 struct zpci_dev *zdev = to_zpci(pdev);
675
676 zpci_fmb_disable_device(zdev);
677 zpci_debug_exit_device(zdev);
678}
679
680#ifdef CONFIG_HIBERNATE_CALLBACKS
681static int zpci_restore(struct device *dev)
682{
683 struct pci_dev *pdev = to_pci_dev(dev);
684 struct zpci_dev *zdev = to_zpci(pdev);
685 int ret = 0;
686
687 if (zdev->state != ZPCI_FN_STATE_ONLINE)
688 goto out;
689
690 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
691 if (ret)
692 goto out;
693
694 zpci_map_resources(pdev);
695 zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
696 (u64) zdev->dma_table);
697
698out:
699 return ret;
700}
701
702static int zpci_freeze(struct device *dev)
703{
704 struct pci_dev *pdev = to_pci_dev(dev);
705 struct zpci_dev *zdev = to_zpci(pdev);
706
707 if (zdev->state != ZPCI_FN_STATE_ONLINE)
708 return 0;
709
710 zpci_unregister_ioat(zdev, 0);
711 zpci_unmap_resources(pdev);
712 return clp_disable_fh(zdev);
713}
714
715struct dev_pm_ops pcibios_pm_ops = {
716 .thaw_noirq = zpci_restore,
717 .freeze_noirq = zpci_freeze,
718 .restore_noirq = zpci_restore,
719 .poweroff_noirq = zpci_freeze,
720};
721#endif /* CONFIG_HIBERNATE_CALLBACKS */
722
723static int zpci_alloc_domain(struct zpci_dev *zdev)
724{
725 spin_lock(&zpci_domain_lock);
726 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
727 if (zdev->domain == ZPCI_NR_DEVICES) {
728 spin_unlock(&zpci_domain_lock);
729 return -ENOSPC;
730 }
731 set_bit(zdev->domain, zpci_domain);
732 spin_unlock(&zpci_domain_lock);
733 return 0;
734}
735
736static void zpci_free_domain(struct zpci_dev *zdev)
737{
738 spin_lock(&zpci_domain_lock);
739 clear_bit(zdev->domain, zpci_domain);
740 spin_unlock(&zpci_domain_lock);
741}
742
743void pcibios_remove_bus(struct pci_bus *bus)
744{
745 struct zpci_dev *zdev = get_zdev_by_bus(bus);
746
747 zpci_exit_slot(zdev);
748 zpci_cleanup_bus_resources(zdev);
749 zpci_free_domain(zdev);
750
751 spin_lock(&zpci_list_lock);
752 list_del(&zdev->entry);
753 spin_unlock(&zpci_list_lock);
754
755 kfree(zdev);
756}
757
758static int zpci_scan_bus(struct zpci_dev *zdev)
759{
760 LIST_HEAD(resources);
761 int ret;
762
763 ret = zpci_setup_bus_resources(zdev, &resources);
764 if (ret)
765 goto error;
766
767 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
768 zdev, &resources);
769 if (!zdev->bus) {
770 ret = -EIO;
771 goto error;
772 }
773 zdev->bus->max_bus_speed = zdev->max_bus_speed;
774 pci_bus_add_devices(zdev->bus);
775 return 0;
776
777error:
778 zpci_cleanup_bus_resources(zdev);
779 pci_free_resource_list(&resources);
780 return ret;
781}
782
783int zpci_enable_device(struct zpci_dev *zdev)
784{
785 int rc;
786
787 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
788 if (rc)
789 goto out;
790
791 rc = zpci_dma_init_device(zdev);
792 if (rc)
793 goto out_dma;
794
795 zdev->state = ZPCI_FN_STATE_ONLINE;
796 return 0;
797
798out_dma:
799 clp_disable_fh(zdev);
800out:
801 return rc;
802}
803EXPORT_SYMBOL_GPL(zpci_enable_device);
804
805int zpci_disable_device(struct zpci_dev *zdev)
806{
807 zpci_dma_exit_device(zdev);
808 return clp_disable_fh(zdev);
809}
810EXPORT_SYMBOL_GPL(zpci_disable_device);
811
812int zpci_create_device(struct zpci_dev *zdev)
813{
814 int rc;
815
816 rc = zpci_alloc_domain(zdev);
817 if (rc)
818 goto out;
819
820 mutex_init(&zdev->lock);
821 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
822 rc = zpci_enable_device(zdev);
823 if (rc)
824 goto out_free;
825 }
826 rc = zpci_scan_bus(zdev);
827 if (rc)
828 goto out_disable;
829
830 spin_lock(&zpci_list_lock);
831 list_add_tail(&zdev->entry, &zpci_list);
832 spin_unlock(&zpci_list_lock);
833
834 zpci_init_slot(zdev);
835
836 return 0;
837
838out_disable:
839 if (zdev->state == ZPCI_FN_STATE_ONLINE)
840 zpci_disable_device(zdev);
841out_free:
842 zpci_free_domain(zdev);
843out:
844 return rc;
845}
846
847void zpci_stop_device(struct zpci_dev *zdev)
848{
849 zpci_dma_exit_device(zdev);
850 /*
851 * Note: SCLP disables fh via set-pci-fn so don't
852 * do that here.
853 */
854}
855EXPORT_SYMBOL_GPL(zpci_stop_device);
856
857static inline int barsize(u8 size)
858{
859 return (size) ? (1 << size) >> 10 : 0;
860}
861
862static int zpci_mem_init(void)
863{
864 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
865 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
866
867 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
868 __alignof__(struct zpci_fmb), 0, NULL);
869 if (!zdev_fmb_cache)
870 goto error_fmb;
871
872 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
873 sizeof(*zpci_iomap_start), GFP_KERNEL);
874 if (!zpci_iomap_start)
875 goto error_iomap;
876
877 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
878 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
879 if (!zpci_iomap_bitmap)
880 goto error_iomap_bitmap;
881
882 return 0;
883error_iomap_bitmap:
884 kfree(zpci_iomap_start);
885error_iomap:
886 kmem_cache_destroy(zdev_fmb_cache);
887error_fmb:
888 return -ENOMEM;
889}
890
891static void zpci_mem_exit(void)
892{
893 kfree(zpci_iomap_bitmap);
894 kfree(zpci_iomap_start);
895 kmem_cache_destroy(zdev_fmb_cache);
896}
897
898static unsigned int s390_pci_probe = 1;
899static unsigned int s390_pci_initialized;
900
901char * __init pcibios_setup(char *str)
902{
903 if (!strcmp(str, "off")) {
904 s390_pci_probe = 0;
905 return NULL;
906 }
907 return str;
908}
909
910bool zpci_is_enabled(void)
911{
912 return s390_pci_initialized;
913}
914
915static int __init pci_base_init(void)
916{
917 int rc;
918
919 if (!s390_pci_probe)
920 return 0;
921
922 if (!test_facility(69) || !test_facility(71) || !test_facility(72))
923 return 0;
924
925 rc = zpci_debug_init();
926 if (rc)
927 goto out;
928
929 rc = zpci_mem_init();
930 if (rc)
931 goto out_mem;
932
933 rc = zpci_irq_init();
934 if (rc)
935 goto out_irq;
936
937 rc = zpci_dma_init();
938 if (rc)
939 goto out_dma;
940
941 rc = clp_scan_pci_devices();
942 if (rc)
943 goto out_find;
944
945 s390_pci_initialized = 1;
946 return 0;
947
948out_find:
949 zpci_dma_exit();
950out_dma:
951 zpci_irq_exit();
952out_irq:
953 zpci_mem_exit();
954out_mem:
955 zpci_debug_exit();
956out:
957 return rc;
958}
959subsys_initcall_sync(pci_base_init);
960
961void zpci_rescan(void)
962{
963 if (zpci_is_enabled())
964 clp_rescan_pci_devices_simple();
965}