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