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
41/* list of all detected zpci devices */
42static LIST_HEAD(zpci_list);
43static DEFINE_SPINLOCK(zpci_list_lock);
44
45static DECLARE_BITMAP(zpci_domain, ZPCI_DOMAIN_BITMAP_SIZE);
46static DEFINE_SPINLOCK(zpci_domain_lock);
47
48#define ZPCI_IOMAP_ENTRIES \
49 min(((unsigned long) ZPCI_NR_DEVICES * PCI_STD_NUM_BARS / 2), \
50 ZPCI_IOMAP_MAX_ENTRIES)
51
52unsigned int s390_pci_no_rid;
53
54static DEFINE_SPINLOCK(zpci_iomap_lock);
55static unsigned long *zpci_iomap_bitmap;
56struct zpci_iomap_entry *zpci_iomap_start;
57EXPORT_SYMBOL_GPL(zpci_iomap_start);
58
59DEFINE_STATIC_KEY_FALSE(have_mio);
60
61static struct kmem_cache *zdev_fmb_cache;
62
63struct zpci_dev *get_zdev_by_fid(u32 fid)
64{
65 struct zpci_dev *tmp, *zdev = NULL;
66
67 spin_lock(&zpci_list_lock);
68 list_for_each_entry(tmp, &zpci_list, entry) {
69 if (tmp->fid == fid) {
70 zdev = tmp;
71 break;
72 }
73 }
74 spin_unlock(&zpci_list_lock);
75 return zdev;
76}
77
78void zpci_remove_reserved_devices(void)
79{
80 struct zpci_dev *tmp, *zdev;
81 enum zpci_state state;
82 LIST_HEAD(remove);
83
84 spin_lock(&zpci_list_lock);
85 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
86 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
87 !clp_get_state(zdev->fid, &state) &&
88 state == ZPCI_FN_STATE_RESERVED)
89 list_move_tail(&zdev->entry, &remove);
90 }
91 spin_unlock(&zpci_list_lock);
92
93 list_for_each_entry_safe(zdev, tmp, &remove, entry)
94 zpci_zdev_put(zdev);
95}
96
97int pci_domain_nr(struct pci_bus *bus)
98{
99 return ((struct zpci_bus *) bus->sysdata)->domain_nr;
100}
101EXPORT_SYMBOL_GPL(pci_domain_nr);
102
103int pci_proc_domain(struct pci_bus *bus)
104{
105 return pci_domain_nr(bus);
106}
107EXPORT_SYMBOL_GPL(pci_proc_domain);
108
109/* Modify PCI: Register I/O address translation parameters */
110int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
111 u64 base, u64 limit, u64 iota)
112{
113 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
114 struct zpci_fib fib = {0};
115 u8 status;
116
117 WARN_ON_ONCE(iota & 0x3fff);
118 fib.pba = base;
119 fib.pal = limit;
120 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
121 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
122}
123
124/* Modify PCI: Unregister I/O address translation parameters */
125int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
126{
127 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
128 struct zpci_fib fib = {0};
129 u8 cc, status;
130
131 cc = zpci_mod_fc(req, &fib, &status);
132 if (cc == 3) /* Function already gone. */
133 cc = 0;
134 return cc ? -EIO : 0;
135}
136
137/* Modify PCI: Set PCI function measurement parameters */
138int zpci_fmb_enable_device(struct zpci_dev *zdev)
139{
140 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
141 struct zpci_fib fib = {0};
142 u8 cc, status;
143
144 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
145 return -EINVAL;
146
147 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
148 if (!zdev->fmb)
149 return -ENOMEM;
150 WARN_ON((u64) zdev->fmb & 0xf);
151
152 /* reset software counters */
153 atomic64_set(&zdev->allocated_pages, 0);
154 atomic64_set(&zdev->mapped_pages, 0);
155 atomic64_set(&zdev->unmapped_pages, 0);
156
157 fib.fmb_addr = virt_to_phys(zdev->fmb);
158 cc = zpci_mod_fc(req, &fib, &status);
159 if (cc) {
160 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
161 zdev->fmb = NULL;
162 }
163 return cc ? -EIO : 0;
164}
165
166/* Modify PCI: Disable PCI function measurement */
167int zpci_fmb_disable_device(struct zpci_dev *zdev)
168{
169 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
170 struct zpci_fib fib = {0};
171 u8 cc, status;
172
173 if (!zdev->fmb)
174 return -EINVAL;
175
176 /* Function measurement is disabled if fmb address is zero */
177 cc = zpci_mod_fc(req, &fib, &status);
178 if (cc == 3) /* Function already gone. */
179 cc = 0;
180
181 if (!cc) {
182 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
183 zdev->fmb = NULL;
184 }
185 return cc ? -EIO : 0;
186}
187
188static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
189{
190 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
191 u64 data;
192 int rc;
193
194 rc = __zpci_load(&data, req, offset);
195 if (!rc) {
196 data = le64_to_cpu((__force __le64) data);
197 data >>= (8 - len) * 8;
198 *val = (u32) data;
199 } else
200 *val = 0xffffffff;
201 return rc;
202}
203
204static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
205{
206 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
207 u64 data = val;
208 int rc;
209
210 data <<= (8 - len) * 8;
211 data = (__force u64) cpu_to_le64(data);
212 rc = __zpci_store(data, req, offset);
213 return rc;
214}
215
216resource_size_t pcibios_align_resource(void *data, const struct resource *res,
217 resource_size_t size,
218 resource_size_t align)
219{
220 return 0;
221}
222
223/* combine single writes by using store-block insn */
224void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
225{
226 zpci_memcpy_toio(to, from, count);
227}
228
229void __iomem *ioremap(phys_addr_t addr, size_t size)
230{
231 unsigned long offset, vaddr;
232 struct vm_struct *area;
233 phys_addr_t last_addr;
234
235 last_addr = addr + size - 1;
236 if (!size || last_addr < addr)
237 return NULL;
238
239 if (!static_branch_unlikely(&have_mio))
240 return (void __iomem *) addr;
241
242 offset = addr & ~PAGE_MASK;
243 addr &= PAGE_MASK;
244 size = PAGE_ALIGN(size + offset);
245 area = get_vm_area(size, VM_IOREMAP);
246 if (!area)
247 return NULL;
248
249 vaddr = (unsigned long) area->addr;
250 if (ioremap_page_range(vaddr, vaddr + size, addr, PAGE_KERNEL)) {
251 free_vm_area(area);
252 return NULL;
253 }
254 return (void __iomem *) ((unsigned long) area->addr + offset);
255}
256EXPORT_SYMBOL(ioremap);
257
258void iounmap(volatile void __iomem *addr)
259{
260 if (static_branch_likely(&have_mio))
261 vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
262}
263EXPORT_SYMBOL(iounmap);
264
265/* Create a virtual mapping cookie for a PCI BAR */
266static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
267 unsigned long offset, unsigned long max)
268{
269 struct zpci_dev *zdev = to_zpci(pdev);
270 int idx;
271
272 idx = zdev->bars[bar].map_idx;
273 spin_lock(&zpci_iomap_lock);
274 /* Detect overrun */
275 WARN_ON(!++zpci_iomap_start[idx].count);
276 zpci_iomap_start[idx].fh = zdev->fh;
277 zpci_iomap_start[idx].bar = bar;
278 spin_unlock(&zpci_iomap_lock);
279
280 return (void __iomem *) ZPCI_ADDR(idx) + offset;
281}
282
283static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
284 unsigned long offset,
285 unsigned long max)
286{
287 unsigned long barsize = pci_resource_len(pdev, bar);
288 struct zpci_dev *zdev = to_zpci(pdev);
289 void __iomem *iova;
290
291 iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
292 return iova ? iova + offset : iova;
293}
294
295void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
296 unsigned long offset, unsigned long max)
297{
298 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
299 return NULL;
300
301 if (static_branch_likely(&have_mio))
302 return pci_iomap_range_mio(pdev, bar, offset, max);
303 else
304 return pci_iomap_range_fh(pdev, bar, offset, max);
305}
306EXPORT_SYMBOL(pci_iomap_range);
307
308void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
309{
310 return pci_iomap_range(dev, bar, 0, maxlen);
311}
312EXPORT_SYMBOL(pci_iomap);
313
314static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
315 unsigned long offset, unsigned long max)
316{
317 unsigned long barsize = pci_resource_len(pdev, bar);
318 struct zpci_dev *zdev = to_zpci(pdev);
319 void __iomem *iova;
320
321 iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
322 return iova ? iova + offset : iova;
323}
324
325void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
326 unsigned long offset, unsigned long max)
327{
328 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
329 return NULL;
330
331 if (static_branch_likely(&have_mio))
332 return pci_iomap_wc_range_mio(pdev, bar, offset, max);
333 else
334 return pci_iomap_range_fh(pdev, bar, offset, max);
335}
336EXPORT_SYMBOL(pci_iomap_wc_range);
337
338void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
339{
340 return pci_iomap_wc_range(dev, bar, 0, maxlen);
341}
342EXPORT_SYMBOL(pci_iomap_wc);
343
344static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
345{
346 unsigned int idx = ZPCI_IDX(addr);
347
348 spin_lock(&zpci_iomap_lock);
349 /* Detect underrun */
350 WARN_ON(!zpci_iomap_start[idx].count);
351 if (!--zpci_iomap_start[idx].count) {
352 zpci_iomap_start[idx].fh = 0;
353 zpci_iomap_start[idx].bar = 0;
354 }
355 spin_unlock(&zpci_iomap_lock);
356}
357
358static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
359{
360 iounmap(addr);
361}
362
363void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
364{
365 if (static_branch_likely(&have_mio))
366 pci_iounmap_mio(pdev, addr);
367 else
368 pci_iounmap_fh(pdev, addr);
369}
370EXPORT_SYMBOL(pci_iounmap);
371
372static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
373 int size, u32 *val)
374{
375 struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
376
377 return (zdev) ? zpci_cfg_load(zdev, where, val, size) : -ENODEV;
378}
379
380static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
381 int size, u32 val)
382{
383 struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
384
385 return (zdev) ? zpci_cfg_store(zdev, where, val, size) : -ENODEV;
386}
387
388static struct pci_ops pci_root_ops = {
389 .read = pci_read,
390 .write = pci_write,
391};
392
393#ifdef CONFIG_PCI_IOV
394static struct resource iov_res = {
395 .name = "PCI IOV res",
396 .start = 0,
397 .end = -1,
398 .flags = IORESOURCE_MEM,
399};
400#endif
401
402static void zpci_map_resources(struct pci_dev *pdev)
403{
404 struct zpci_dev *zdev = to_zpci(pdev);
405 resource_size_t len;
406 int i;
407
408 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
409 len = pci_resource_len(pdev, i);
410 if (!len)
411 continue;
412
413 if (zpci_use_mio(zdev))
414 pdev->resource[i].start =
415 (resource_size_t __force) zdev->bars[i].mio_wt;
416 else
417 pdev->resource[i].start = (resource_size_t __force)
418 pci_iomap_range_fh(pdev, i, 0, 0);
419 pdev->resource[i].end = pdev->resource[i].start + len - 1;
420 }
421
422#ifdef CONFIG_PCI_IOV
423 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
424 int bar = i + PCI_IOV_RESOURCES;
425
426 len = pci_resource_len(pdev, bar);
427 if (!len)
428 continue;
429 pdev->resource[bar].parent = &iov_res;
430 }
431#endif
432}
433
434static void zpci_unmap_resources(struct pci_dev *pdev)
435{
436 struct zpci_dev *zdev = to_zpci(pdev);
437 resource_size_t len;
438 int i;
439
440 if (zpci_use_mio(zdev))
441 return;
442
443 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
444 len = pci_resource_len(pdev, i);
445 if (!len)
446 continue;
447 pci_iounmap_fh(pdev, (void __iomem __force *)
448 pdev->resource[i].start);
449 }
450}
451
452static int zpci_alloc_iomap(struct zpci_dev *zdev)
453{
454 unsigned long entry;
455
456 spin_lock(&zpci_iomap_lock);
457 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
458 if (entry == ZPCI_IOMAP_ENTRIES) {
459 spin_unlock(&zpci_iomap_lock);
460 return -ENOSPC;
461 }
462 set_bit(entry, zpci_iomap_bitmap);
463 spin_unlock(&zpci_iomap_lock);
464 return entry;
465}
466
467static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
468{
469 spin_lock(&zpci_iomap_lock);
470 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
471 clear_bit(entry, zpci_iomap_bitmap);
472 spin_unlock(&zpci_iomap_lock);
473}
474
475static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
476 unsigned long size, unsigned long flags)
477{
478 struct resource *r;
479
480 r = kzalloc(sizeof(*r), GFP_KERNEL);
481 if (!r)
482 return NULL;
483
484 r->start = start;
485 r->end = r->start + size - 1;
486 r->flags = flags;
487 r->name = zdev->res_name;
488
489 if (request_resource(&iomem_resource, r)) {
490 kfree(r);
491 return NULL;
492 }
493 return r;
494}
495
496int zpci_setup_bus_resources(struct zpci_dev *zdev,
497 struct list_head *resources)
498{
499 unsigned long addr, size, flags;
500 struct resource *res;
501 int i, entry;
502
503 snprintf(zdev->res_name, sizeof(zdev->res_name),
504 "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR);
505
506 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
507 if (!zdev->bars[i].size)
508 continue;
509 entry = zpci_alloc_iomap(zdev);
510 if (entry < 0)
511 return entry;
512 zdev->bars[i].map_idx = entry;
513
514 /* only MMIO is supported */
515 flags = IORESOURCE_MEM;
516 if (zdev->bars[i].val & 8)
517 flags |= IORESOURCE_PREFETCH;
518 if (zdev->bars[i].val & 4)
519 flags |= IORESOURCE_MEM_64;
520
521 if (zpci_use_mio(zdev))
522 addr = (unsigned long) zdev->bars[i].mio_wt;
523 else
524 addr = ZPCI_ADDR(entry);
525 size = 1UL << zdev->bars[i].size;
526
527 res = __alloc_res(zdev, addr, size, flags);
528 if (!res) {
529 zpci_free_iomap(zdev, entry);
530 return -ENOMEM;
531 }
532 zdev->bars[i].res = res;
533 pci_add_resource(resources, res);
534 }
535
536 return 0;
537}
538
539static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
540{
541 int i;
542
543 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
544 if (!zdev->bars[i].size || !zdev->bars[i].res)
545 continue;
546
547 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
548 release_resource(zdev->bars[i].res);
549 kfree(zdev->bars[i].res);
550 }
551}
552
553int pcibios_add_device(struct pci_dev *pdev)
554{
555 struct resource *res;
556 int i;
557
558 if (pdev->is_physfn)
559 pdev->no_vf_scan = 1;
560
561 pdev->dev.groups = zpci_attr_groups;
562 pdev->dev.dma_ops = &s390_pci_dma_ops;
563 zpci_map_resources(pdev);
564
565 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
566 res = &pdev->resource[i];
567 if (res->parent || !res->flags)
568 continue;
569 pci_claim_resource(pdev, i);
570 }
571
572 return 0;
573}
574
575void pcibios_release_device(struct pci_dev *pdev)
576{
577 zpci_unmap_resources(pdev);
578}
579
580int pcibios_enable_device(struct pci_dev *pdev, int mask)
581{
582 struct zpci_dev *zdev = to_zpci(pdev);
583
584 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
585 zpci_fmb_enable_device(zdev);
586
587 return pci_enable_resources(pdev, mask);
588}
589
590void pcibios_disable_device(struct pci_dev *pdev)
591{
592 struct zpci_dev *zdev = to_zpci(pdev);
593
594 zpci_fmb_disable_device(zdev);
595 zpci_debug_exit_device(zdev);
596}
597
598static int __zpci_register_domain(int domain)
599{
600 spin_lock(&zpci_domain_lock);
601 if (test_bit(domain, zpci_domain)) {
602 spin_unlock(&zpci_domain_lock);
603 pr_err("Domain %04x is already assigned\n", domain);
604 return -EEXIST;
605 }
606 set_bit(domain, zpci_domain);
607 spin_unlock(&zpci_domain_lock);
608 return domain;
609}
610
611static int __zpci_alloc_domain(void)
612{
613 int domain;
614
615 spin_lock(&zpci_domain_lock);
616 /*
617 * We can always auto allocate domains below ZPCI_NR_DEVICES.
618 * There is either a free domain or we have reached the maximum in
619 * which case we would have bailed earlier.
620 */
621 domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
622 set_bit(domain, zpci_domain);
623 spin_unlock(&zpci_domain_lock);
624 return domain;
625}
626
627int zpci_alloc_domain(int domain)
628{
629 if (zpci_unique_uid) {
630 if (domain)
631 return __zpci_register_domain(domain);
632 pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n");
633 update_uid_checking(false);
634 }
635 return __zpci_alloc_domain();
636}
637
638void zpci_free_domain(int domain)
639{
640 spin_lock(&zpci_domain_lock);
641 clear_bit(domain, zpci_domain);
642 spin_unlock(&zpci_domain_lock);
643}
644
645
646int zpci_enable_device(struct zpci_dev *zdev)
647{
648 int rc;
649
650 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
651 if (rc)
652 goto out;
653
654 rc = zpci_dma_init_device(zdev);
655 if (rc)
656 goto out_dma;
657
658 zdev->state = ZPCI_FN_STATE_ONLINE;
659 return 0;
660
661out_dma:
662 clp_disable_fh(zdev);
663out:
664 return rc;
665}
666EXPORT_SYMBOL_GPL(zpci_enable_device);
667
668int zpci_disable_device(struct zpci_dev *zdev)
669{
670 zpci_dma_exit_device(zdev);
671 /*
672 * The zPCI function may already be disabled by the platform, this is
673 * detected in clp_disable_fh() which becomes a no-op.
674 */
675 return clp_disable_fh(zdev);
676}
677EXPORT_SYMBOL_GPL(zpci_disable_device);
678
679void zpci_remove_device(struct zpci_dev *zdev)
680{
681 struct zpci_bus *zbus = zdev->zbus;
682 struct pci_dev *pdev;
683
684 pdev = pci_get_slot(zbus->bus, zdev->devfn);
685 if (pdev) {
686 if (pdev->is_virtfn)
687 return zpci_remove_virtfn(pdev, zdev->vfn);
688 pci_stop_and_remove_bus_device_locked(pdev);
689 }
690}
691
692int zpci_create_device(struct zpci_dev *zdev)
693{
694 int rc;
695
696 kref_init(&zdev->kref);
697
698 spin_lock(&zpci_list_lock);
699 list_add_tail(&zdev->entry, &zpci_list);
700 spin_unlock(&zpci_list_lock);
701
702 rc = zpci_init_iommu(zdev);
703 if (rc)
704 goto out;
705
706 mutex_init(&zdev->lock);
707 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
708 rc = zpci_enable_device(zdev);
709 if (rc)
710 goto out_destroy_iommu;
711 }
712
713 rc = zpci_bus_device_register(zdev, &pci_root_ops);
714 if (rc)
715 goto out_disable;
716
717 return 0;
718
719out_disable:
720 if (zdev->state == ZPCI_FN_STATE_ONLINE)
721 zpci_disable_device(zdev);
722
723out_destroy_iommu:
724 zpci_destroy_iommu(zdev);
725out:
726 spin_lock(&zpci_list_lock);
727 list_del(&zdev->entry);
728 spin_unlock(&zpci_list_lock);
729 return rc;
730}
731
732void zpci_release_device(struct kref *kref)
733{
734 struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref);
735
736 if (zdev->zbus->bus)
737 zpci_remove_device(zdev);
738
739 switch (zdev->state) {
740 case ZPCI_FN_STATE_ONLINE:
741 case ZPCI_FN_STATE_CONFIGURED:
742 zpci_disable_device(zdev);
743 fallthrough;
744 case ZPCI_FN_STATE_STANDBY:
745 if (zdev->has_hp_slot)
746 zpci_exit_slot(zdev);
747 zpci_cleanup_bus_resources(zdev);
748 zpci_bus_device_unregister(zdev);
749 zpci_destroy_iommu(zdev);
750 fallthrough;
751 default:
752 break;
753 }
754
755 spin_lock(&zpci_list_lock);
756 list_del(&zdev->entry);
757 spin_unlock(&zpci_list_lock);
758 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
759 kfree(zdev);
760}
761
762int zpci_report_error(struct pci_dev *pdev,
763 struct zpci_report_error_header *report)
764{
765 struct zpci_dev *zdev = to_zpci(pdev);
766
767 return sclp_pci_report(report, zdev->fh, zdev->fid);
768}
769EXPORT_SYMBOL(zpci_report_error);
770
771static int zpci_mem_init(void)
772{
773 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
774 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
775
776 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
777 __alignof__(struct zpci_fmb), 0, NULL);
778 if (!zdev_fmb_cache)
779 goto error_fmb;
780
781 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
782 sizeof(*zpci_iomap_start), GFP_KERNEL);
783 if (!zpci_iomap_start)
784 goto error_iomap;
785
786 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
787 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
788 if (!zpci_iomap_bitmap)
789 goto error_iomap_bitmap;
790
791 return 0;
792error_iomap_bitmap:
793 kfree(zpci_iomap_start);
794error_iomap:
795 kmem_cache_destroy(zdev_fmb_cache);
796error_fmb:
797 return -ENOMEM;
798}
799
800static void zpci_mem_exit(void)
801{
802 kfree(zpci_iomap_bitmap);
803 kfree(zpci_iomap_start);
804 kmem_cache_destroy(zdev_fmb_cache);
805}
806
807static unsigned int s390_pci_probe __initdata = 1;
808static unsigned int s390_pci_no_mio __initdata;
809unsigned int s390_pci_force_floating __initdata;
810static unsigned int s390_pci_initialized;
811
812char * __init pcibios_setup(char *str)
813{
814 if (!strcmp(str, "off")) {
815 s390_pci_probe = 0;
816 return NULL;
817 }
818 if (!strcmp(str, "nomio")) {
819 s390_pci_no_mio = 1;
820 return NULL;
821 }
822 if (!strcmp(str, "force_floating")) {
823 s390_pci_force_floating = 1;
824 return NULL;
825 }
826 if (!strcmp(str, "norid")) {
827 s390_pci_no_rid = 1;
828 return NULL;
829 }
830 return str;
831}
832
833bool zpci_is_enabled(void)
834{
835 return s390_pci_initialized;
836}
837
838static int __init pci_base_init(void)
839{
840 int rc;
841
842 if (!s390_pci_probe)
843 return 0;
844
845 if (!test_facility(69) || !test_facility(71))
846 return 0;
847
848 if (test_facility(153) && !s390_pci_no_mio) {
849 static_branch_enable(&have_mio);
850 ctl_set_bit(2, 5);
851 }
852
853 rc = zpci_debug_init();
854 if (rc)
855 goto out;
856
857 rc = zpci_mem_init();
858 if (rc)
859 goto out_mem;
860
861 rc = zpci_irq_init();
862 if (rc)
863 goto out_irq;
864
865 rc = zpci_dma_init();
866 if (rc)
867 goto out_dma;
868
869 rc = clp_scan_pci_devices();
870 if (rc)
871 goto out_find;
872
873 s390_pci_initialized = 1;
874 return 0;
875
876out_find:
877 zpci_dma_exit();
878out_dma:
879 zpci_irq_exit();
880out_irq:
881 zpci_mem_exit();
882out_mem:
883 zpci_debug_exit();
884out:
885 return rc;
886}
887subsys_initcall_sync(pci_base_init);
888
889void zpci_rescan(void)
890{
891 if (zpci_is_enabled())
892 clp_rescan_pci_devices_simple(NULL);
893}
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}