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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
64struct zpci_dev *get_zdev_by_fid(u32 fid)
65{
66 struct zpci_dev *tmp, *zdev = NULL;
67
68 spin_lock(&zpci_list_lock);
69 list_for_each_entry(tmp, &zpci_list, entry) {
70 if (tmp->fid == fid) {
71 zdev = tmp;
72 break;
73 }
74 }
75 spin_unlock(&zpci_list_lock);
76 return zdev;
77}
78
79void zpci_remove_reserved_devices(void)
80{
81 struct zpci_dev *tmp, *zdev;
82 enum zpci_state state;
83 LIST_HEAD(remove);
84
85 spin_lock(&zpci_list_lock);
86 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
87 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
88 !clp_get_state(zdev->fid, &state) &&
89 state == ZPCI_FN_STATE_RESERVED)
90 list_move_tail(&zdev->entry, &remove);
91 }
92 spin_unlock(&zpci_list_lock);
93
94 list_for_each_entry_safe(zdev, tmp, &remove, entry)
95 zpci_device_reserved(zdev);
96}
97
98int pci_domain_nr(struct pci_bus *bus)
99{
100 return ((struct zpci_bus *) bus->sysdata)->domain_nr;
101}
102EXPORT_SYMBOL_GPL(pci_domain_nr);
103
104int pci_proc_domain(struct pci_bus *bus)
105{
106 return pci_domain_nr(bus);
107}
108EXPORT_SYMBOL_GPL(pci_proc_domain);
109
110/* Modify PCI: Register I/O address translation parameters */
111int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
112 u64 base, u64 limit, u64 iota)
113{
114 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
115 struct zpci_fib fib = {0};
116 u8 status;
117
118 WARN_ON_ONCE(iota & 0x3fff);
119 fib.pba = base;
120 fib.pal = limit;
121 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
122 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
123}
124
125/* Modify PCI: Unregister I/O address translation parameters */
126int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
127{
128 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
129 struct zpci_fib fib = {0};
130 u8 cc, status;
131
132 cc = zpci_mod_fc(req, &fib, &status);
133 if (cc == 3) /* Function already gone. */
134 cc = 0;
135 return cc ? -EIO : 0;
136}
137
138/* Modify PCI: Set PCI function measurement parameters */
139int zpci_fmb_enable_device(struct zpci_dev *zdev)
140{
141 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
142 struct zpci_fib fib = {0};
143 u8 cc, status;
144
145 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
146 return -EINVAL;
147
148 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
149 if (!zdev->fmb)
150 return -ENOMEM;
151 WARN_ON((u64) zdev->fmb & 0xf);
152
153 /* reset software counters */
154 atomic64_set(&zdev->allocated_pages, 0);
155 atomic64_set(&zdev->mapped_pages, 0);
156 atomic64_set(&zdev->unmapped_pages, 0);
157
158 fib.fmb_addr = virt_to_phys(zdev->fmb);
159 cc = zpci_mod_fc(req, &fib, &status);
160 if (cc) {
161 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
162 zdev->fmb = NULL;
163 }
164 return cc ? -EIO : 0;
165}
166
167/* Modify PCI: Disable PCI function measurement */
168int zpci_fmb_disable_device(struct zpci_dev *zdev)
169{
170 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
171 struct zpci_fib fib = {0};
172 u8 cc, status;
173
174 if (!zdev->fmb)
175 return -EINVAL;
176
177 /* Function measurement is disabled if fmb address is zero */
178 cc = zpci_mod_fc(req, &fib, &status);
179 if (cc == 3) /* Function already gone. */
180 cc = 0;
181
182 if (!cc) {
183 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
184 zdev->fmb = NULL;
185 }
186 return cc ? -EIO : 0;
187}
188
189static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
190{
191 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
192 u64 data;
193 int rc;
194
195 rc = __zpci_load(&data, req, offset);
196 if (!rc) {
197 data = le64_to_cpu((__force __le64) data);
198 data >>= (8 - len) * 8;
199 *val = (u32) data;
200 } else
201 *val = 0xffffffff;
202 return rc;
203}
204
205static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
206{
207 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
208 u64 data = val;
209 int rc;
210
211 data <<= (8 - len) * 8;
212 data = (__force u64) cpu_to_le64(data);
213 rc = __zpci_store(data, req, offset);
214 return rc;
215}
216
217resource_size_t pcibios_align_resource(void *data, const struct resource *res,
218 resource_size_t size,
219 resource_size_t align)
220{
221 return 0;
222}
223
224/* combine single writes by using store-block insn */
225void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
226{
227 zpci_memcpy_toio(to, from, count);
228}
229
230static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot)
231{
232 unsigned long offset, vaddr;
233 struct vm_struct *area;
234 phys_addr_t last_addr;
235
236 last_addr = addr + size - 1;
237 if (!size || last_addr < addr)
238 return NULL;
239
240 if (!static_branch_unlikely(&have_mio))
241 return (void __iomem *) addr;
242
243 offset = addr & ~PAGE_MASK;
244 addr &= PAGE_MASK;
245 size = PAGE_ALIGN(size + offset);
246 area = get_vm_area(size, VM_IOREMAP);
247 if (!area)
248 return NULL;
249
250 vaddr = (unsigned long) area->addr;
251 if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
252 free_vm_area(area);
253 return NULL;
254 }
255 return (void __iomem *) ((unsigned long) area->addr + offset);
256}
257
258void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
259{
260 return __ioremap(addr, size, __pgprot(prot));
261}
262EXPORT_SYMBOL(ioremap_prot);
263
264void __iomem *ioremap(phys_addr_t addr, size_t size)
265{
266 return __ioremap(addr, size, PAGE_KERNEL);
267}
268EXPORT_SYMBOL(ioremap);
269
270void __iomem *ioremap_wc(phys_addr_t addr, size_t size)
271{
272 return __ioremap(addr, size, pgprot_writecombine(PAGE_KERNEL));
273}
274EXPORT_SYMBOL(ioremap_wc);
275
276void __iomem *ioremap_wt(phys_addr_t addr, size_t size)
277{
278 return __ioremap(addr, size, pgprot_writethrough(PAGE_KERNEL));
279}
280EXPORT_SYMBOL(ioremap_wt);
281
282void iounmap(volatile void __iomem *addr)
283{
284 if (static_branch_likely(&have_mio))
285 vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
286}
287EXPORT_SYMBOL(iounmap);
288
289/* Create a virtual mapping cookie for a PCI BAR */
290static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
291 unsigned long offset, unsigned long max)
292{
293 struct zpci_dev *zdev = to_zpci(pdev);
294 int idx;
295
296 idx = zdev->bars[bar].map_idx;
297 spin_lock(&zpci_iomap_lock);
298 /* Detect overrun */
299 WARN_ON(!++zpci_iomap_start[idx].count);
300 zpci_iomap_start[idx].fh = zdev->fh;
301 zpci_iomap_start[idx].bar = bar;
302 spin_unlock(&zpci_iomap_lock);
303
304 return (void __iomem *) ZPCI_ADDR(idx) + offset;
305}
306
307static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
308 unsigned long offset,
309 unsigned long max)
310{
311 unsigned long barsize = pci_resource_len(pdev, bar);
312 struct zpci_dev *zdev = to_zpci(pdev);
313 void __iomem *iova;
314
315 iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
316 return iova ? iova + offset : iova;
317}
318
319void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
320 unsigned long offset, unsigned long max)
321{
322 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
323 return NULL;
324
325 if (static_branch_likely(&have_mio))
326 return pci_iomap_range_mio(pdev, bar, offset, max);
327 else
328 return pci_iomap_range_fh(pdev, bar, offset, max);
329}
330EXPORT_SYMBOL(pci_iomap_range);
331
332void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
333{
334 return pci_iomap_range(dev, bar, 0, maxlen);
335}
336EXPORT_SYMBOL(pci_iomap);
337
338static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
339 unsigned long offset, unsigned long max)
340{
341 unsigned long barsize = pci_resource_len(pdev, bar);
342 struct zpci_dev *zdev = to_zpci(pdev);
343 void __iomem *iova;
344
345 iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
346 return iova ? iova + offset : iova;
347}
348
349void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
350 unsigned long offset, unsigned long max)
351{
352 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
353 return NULL;
354
355 if (static_branch_likely(&have_mio))
356 return pci_iomap_wc_range_mio(pdev, bar, offset, max);
357 else
358 return pci_iomap_range_fh(pdev, bar, offset, max);
359}
360EXPORT_SYMBOL(pci_iomap_wc_range);
361
362void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
363{
364 return pci_iomap_wc_range(dev, bar, 0, maxlen);
365}
366EXPORT_SYMBOL(pci_iomap_wc);
367
368static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
369{
370 unsigned int idx = ZPCI_IDX(addr);
371
372 spin_lock(&zpci_iomap_lock);
373 /* Detect underrun */
374 WARN_ON(!zpci_iomap_start[idx].count);
375 if (!--zpci_iomap_start[idx].count) {
376 zpci_iomap_start[idx].fh = 0;
377 zpci_iomap_start[idx].bar = 0;
378 }
379 spin_unlock(&zpci_iomap_lock);
380}
381
382static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
383{
384 iounmap(addr);
385}
386
387void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
388{
389 if (static_branch_likely(&have_mio))
390 pci_iounmap_mio(pdev, addr);
391 else
392 pci_iounmap_fh(pdev, addr);
393}
394EXPORT_SYMBOL(pci_iounmap);
395
396static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
397 int size, u32 *val)
398{
399 struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
400
401 return (zdev) ? zpci_cfg_load(zdev, where, val, size) : -ENODEV;
402}
403
404static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
405 int size, u32 val)
406{
407 struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
408
409 return (zdev) ? zpci_cfg_store(zdev, where, val, size) : -ENODEV;
410}
411
412static struct pci_ops pci_root_ops = {
413 .read = pci_read,
414 .write = pci_write,
415};
416
417static void zpci_map_resources(struct pci_dev *pdev)
418{
419 struct zpci_dev *zdev = to_zpci(pdev);
420 resource_size_t len;
421 int i;
422
423 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
424 len = pci_resource_len(pdev, i);
425 if (!len)
426 continue;
427
428 if (zpci_use_mio(zdev))
429 pdev->resource[i].start =
430 (resource_size_t __force) zdev->bars[i].mio_wt;
431 else
432 pdev->resource[i].start = (resource_size_t __force)
433 pci_iomap_range_fh(pdev, i, 0, 0);
434 pdev->resource[i].end = pdev->resource[i].start + len - 1;
435 }
436
437 zpci_iov_map_resources(pdev);
438}
439
440static void zpci_unmap_resources(struct pci_dev *pdev)
441{
442 struct zpci_dev *zdev = to_zpci(pdev);
443 resource_size_t len;
444 int i;
445
446 if (zpci_use_mio(zdev))
447 return;
448
449 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
450 len = pci_resource_len(pdev, i);
451 if (!len)
452 continue;
453 pci_iounmap_fh(pdev, (void __iomem __force *)
454 pdev->resource[i].start);
455 }
456}
457
458static int zpci_alloc_iomap(struct zpci_dev *zdev)
459{
460 unsigned long entry;
461
462 spin_lock(&zpci_iomap_lock);
463 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
464 if (entry == ZPCI_IOMAP_ENTRIES) {
465 spin_unlock(&zpci_iomap_lock);
466 return -ENOSPC;
467 }
468 set_bit(entry, zpci_iomap_bitmap);
469 spin_unlock(&zpci_iomap_lock);
470 return entry;
471}
472
473static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
474{
475 spin_lock(&zpci_iomap_lock);
476 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
477 clear_bit(entry, zpci_iomap_bitmap);
478 spin_unlock(&zpci_iomap_lock);
479}
480
481static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
482 unsigned long size, unsigned long flags)
483{
484 struct resource *r;
485
486 r = kzalloc(sizeof(*r), GFP_KERNEL);
487 if (!r)
488 return NULL;
489
490 r->start = start;
491 r->end = r->start + size - 1;
492 r->flags = flags;
493 r->name = zdev->res_name;
494
495 if (request_resource(&iomem_resource, r)) {
496 kfree(r);
497 return NULL;
498 }
499 return r;
500}
501
502int zpci_setup_bus_resources(struct zpci_dev *zdev,
503 struct list_head *resources)
504{
505 unsigned long addr, size, flags;
506 struct resource *res;
507 int i, entry;
508
509 snprintf(zdev->res_name, sizeof(zdev->res_name),
510 "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR);
511
512 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
513 if (!zdev->bars[i].size)
514 continue;
515 entry = zpci_alloc_iomap(zdev);
516 if (entry < 0)
517 return entry;
518 zdev->bars[i].map_idx = entry;
519
520 /* only MMIO is supported */
521 flags = IORESOURCE_MEM;
522 if (zdev->bars[i].val & 8)
523 flags |= IORESOURCE_PREFETCH;
524 if (zdev->bars[i].val & 4)
525 flags |= IORESOURCE_MEM_64;
526
527 if (zpci_use_mio(zdev))
528 addr = (unsigned long) zdev->bars[i].mio_wt;
529 else
530 addr = ZPCI_ADDR(entry);
531 size = 1UL << zdev->bars[i].size;
532
533 res = __alloc_res(zdev, addr, size, flags);
534 if (!res) {
535 zpci_free_iomap(zdev, entry);
536 return -ENOMEM;
537 }
538 zdev->bars[i].res = res;
539 pci_add_resource(resources, res);
540 }
541 zdev->has_resources = 1;
542
543 return 0;
544}
545
546static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
547{
548 int i;
549
550 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
551 if (!zdev->bars[i].size || !zdev->bars[i].res)
552 continue;
553
554 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
555 release_resource(zdev->bars[i].res);
556 kfree(zdev->bars[i].res);
557 }
558 zdev->has_resources = 0;
559}
560
561int pcibios_add_device(struct pci_dev *pdev)
562{
563 struct zpci_dev *zdev = to_zpci(pdev);
564 struct resource *res;
565 int i;
566
567 /* The pdev has a reference to the zdev via its bus */
568 zpci_zdev_get(zdev);
569 if (pdev->is_physfn)
570 pdev->no_vf_scan = 1;
571
572 pdev->dev.groups = zpci_attr_groups;
573 pdev->dev.dma_ops = &s390_pci_dma_ops;
574 zpci_map_resources(pdev);
575
576 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
577 res = &pdev->resource[i];
578 if (res->parent || !res->flags)
579 continue;
580 pci_claim_resource(pdev, i);
581 }
582
583 return 0;
584}
585
586void pcibios_release_device(struct pci_dev *pdev)
587{
588 struct zpci_dev *zdev = to_zpci(pdev);
589
590 zpci_unmap_resources(pdev);
591 zpci_zdev_put(zdev);
592}
593
594int pcibios_enable_device(struct pci_dev *pdev, int mask)
595{
596 struct zpci_dev *zdev = to_zpci(pdev);
597
598 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
599 zpci_fmb_enable_device(zdev);
600
601 return pci_enable_resources(pdev, mask);
602}
603
604void pcibios_disable_device(struct pci_dev *pdev)
605{
606 struct zpci_dev *zdev = to_zpci(pdev);
607
608 zpci_fmb_disable_device(zdev);
609 zpci_debug_exit_device(zdev);
610}
611
612static int __zpci_register_domain(int domain)
613{
614 spin_lock(&zpci_domain_lock);
615 if (test_bit(domain, zpci_domain)) {
616 spin_unlock(&zpci_domain_lock);
617 pr_err("Domain %04x is already assigned\n", domain);
618 return -EEXIST;
619 }
620 set_bit(domain, zpci_domain);
621 spin_unlock(&zpci_domain_lock);
622 return domain;
623}
624
625static int __zpci_alloc_domain(void)
626{
627 int domain;
628
629 spin_lock(&zpci_domain_lock);
630 /*
631 * We can always auto allocate domains below ZPCI_NR_DEVICES.
632 * There is either a free domain or we have reached the maximum in
633 * which case we would have bailed earlier.
634 */
635 domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
636 set_bit(domain, zpci_domain);
637 spin_unlock(&zpci_domain_lock);
638 return domain;
639}
640
641int zpci_alloc_domain(int domain)
642{
643 if (zpci_unique_uid) {
644 if (domain)
645 return __zpci_register_domain(domain);
646 pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n");
647 update_uid_checking(false);
648 }
649 return __zpci_alloc_domain();
650}
651
652void zpci_free_domain(int domain)
653{
654 spin_lock(&zpci_domain_lock);
655 clear_bit(domain, zpci_domain);
656 spin_unlock(&zpci_domain_lock);
657}
658
659
660int zpci_enable_device(struct zpci_dev *zdev)
661{
662 int rc;
663
664 if (clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES)) {
665 rc = -EIO;
666 goto out;
667 }
668
669 rc = zpci_dma_init_device(zdev);
670 if (rc)
671 goto out_dma;
672
673 return 0;
674
675out_dma:
676 clp_disable_fh(zdev);
677out:
678 return rc;
679}
680
681int zpci_disable_device(struct zpci_dev *zdev)
682{
683 zpci_dma_exit_device(zdev);
684 /*
685 * The zPCI function may already be disabled by the platform, this is
686 * detected in clp_disable_fh() which becomes a no-op.
687 */
688 return clp_disable_fh(zdev) ? -EIO : 0;
689}
690
691/**
692 * zpci_create_device() - Create a new zpci_dev and add it to the zbus
693 * @fid: Function ID of the device to be created
694 * @fh: Current Function Handle of the device to be created
695 * @state: Initial state after creation either Standby or Configured
696 *
697 * Creates a new zpci device and adds it to its, possibly newly created, zbus
698 * as well as zpci_list.
699 *
700 * Returns: the zdev on success or an error pointer otherwise
701 */
702struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state)
703{
704 struct zpci_dev *zdev;
705 int rc;
706
707 zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, state);
708 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
709 if (!zdev)
710 return ERR_PTR(-ENOMEM);
711
712 /* FID and Function Handle are the static/dynamic identifiers */
713 zdev->fid = fid;
714 zdev->fh = fh;
715
716 /* Query function properties and update zdev */
717 rc = clp_query_pci_fn(zdev);
718 if (rc)
719 goto error;
720 zdev->state = state;
721
722 kref_init(&zdev->kref);
723 mutex_init(&zdev->lock);
724
725 rc = zpci_init_iommu(zdev);
726 if (rc)
727 goto error;
728
729 rc = zpci_bus_device_register(zdev, &pci_root_ops);
730 if (rc)
731 goto error_destroy_iommu;
732
733 spin_lock(&zpci_list_lock);
734 list_add_tail(&zdev->entry, &zpci_list);
735 spin_unlock(&zpci_list_lock);
736
737 return zdev;
738
739error_destroy_iommu:
740 zpci_destroy_iommu(zdev);
741error:
742 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
743 kfree(zdev);
744 return ERR_PTR(rc);
745}
746
747bool zpci_is_device_configured(struct zpci_dev *zdev)
748{
749 enum zpci_state state = zdev->state;
750
751 return state != ZPCI_FN_STATE_RESERVED &&
752 state != ZPCI_FN_STATE_STANDBY;
753}
754
755/**
756 * zpci_scan_configured_device() - Scan a freshly configured zpci_dev
757 * @zdev: The zpci_dev to be configured
758 * @fh: The general function handle supplied by the platform
759 *
760 * Given a device in the configuration state Configured, enables, scans and
761 * adds it to the common code PCI subsystem if possible. If the PCI device is
762 * parked because we can not yet create a PCI bus because we have not seen
763 * function 0, it is ignored but will be scanned once function 0 appears.
764 * If any failure occurs, the zpci_dev is left disabled.
765 *
766 * Return: 0 on success, or an error code otherwise
767 */
768int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh)
769{
770 int rc;
771
772 zdev->fh = fh;
773 /* the PCI function will be scanned once function 0 appears */
774 if (!zdev->zbus->bus)
775 return 0;
776
777 /* For function 0 on a multi-function bus scan whole bus as we might
778 * have to pick up existing functions waiting for it to allow creating
779 * the PCI bus
780 */
781 if (zdev->devfn == 0 && zdev->zbus->multifunction)
782 rc = zpci_bus_scan_bus(zdev->zbus);
783 else
784 rc = zpci_bus_scan_device(zdev);
785
786 return rc;
787}
788
789/**
790 * zpci_deconfigure_device() - Deconfigure a zpci_dev
791 * @zdev: The zpci_dev to configure
792 *
793 * Deconfigure a zPCI function that is currently configured and possibly known
794 * to the common code PCI subsystem.
795 * If any failure occurs the device is left as is.
796 *
797 * Return: 0 on success, or an error code otherwise
798 */
799int zpci_deconfigure_device(struct zpci_dev *zdev)
800{
801 int rc;
802
803 if (zdev->zbus->bus)
804 zpci_bus_remove_device(zdev, false);
805
806 if (zdev_enabled(zdev)) {
807 rc = zpci_disable_device(zdev);
808 if (rc)
809 return rc;
810 }
811
812 rc = sclp_pci_deconfigure(zdev->fid);
813 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, rc);
814 if (rc)
815 return rc;
816 zdev->state = ZPCI_FN_STATE_STANDBY;
817
818 return 0;
819}
820
821/**
822 * zpci_device_reserved() - Mark device as resverved
823 * @zdev: the zpci_dev that was reserved
824 *
825 * Handle the case that a given zPCI function was reserved by another system.
826 * After a call to this function the zpci_dev can not be found via
827 * get_zdev_by_fid() anymore but may still be accessible via existing
828 * references though it will not be functional anymore.
829 */
830void zpci_device_reserved(struct zpci_dev *zdev)
831{
832 if (zdev->has_hp_slot)
833 zpci_exit_slot(zdev);
834 /*
835 * Remove device from zpci_list as it is going away. This also
836 * makes sure we ignore subsequent zPCI events for this device.
837 */
838 spin_lock(&zpci_list_lock);
839 list_del(&zdev->entry);
840 spin_unlock(&zpci_list_lock);
841 zdev->state = ZPCI_FN_STATE_RESERVED;
842 zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
843 zpci_zdev_put(zdev);
844}
845
846void zpci_release_device(struct kref *kref)
847{
848 struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref);
849 int ret;
850
851 if (zdev->zbus->bus)
852 zpci_bus_remove_device(zdev, false);
853
854 if (zdev_enabled(zdev))
855 zpci_disable_device(zdev);
856
857 switch (zdev->state) {
858 case ZPCI_FN_STATE_CONFIGURED:
859 ret = sclp_pci_deconfigure(zdev->fid);
860 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
861 fallthrough;
862 case ZPCI_FN_STATE_STANDBY:
863 if (zdev->has_hp_slot)
864 zpci_exit_slot(zdev);
865 spin_lock(&zpci_list_lock);
866 list_del(&zdev->entry);
867 spin_unlock(&zpci_list_lock);
868 zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
869 fallthrough;
870 case ZPCI_FN_STATE_RESERVED:
871 if (zdev->has_resources)
872 zpci_cleanup_bus_resources(zdev);
873 zpci_bus_device_unregister(zdev);
874 zpci_destroy_iommu(zdev);
875 fallthrough;
876 default:
877 break;
878 }
879 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
880 kfree(zdev);
881}
882
883int zpci_report_error(struct pci_dev *pdev,
884 struct zpci_report_error_header *report)
885{
886 struct zpci_dev *zdev = to_zpci(pdev);
887
888 return sclp_pci_report(report, zdev->fh, zdev->fid);
889}
890EXPORT_SYMBOL(zpci_report_error);
891
892static int zpci_mem_init(void)
893{
894 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
895 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
896
897 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
898 __alignof__(struct zpci_fmb), 0, NULL);
899 if (!zdev_fmb_cache)
900 goto error_fmb;
901
902 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
903 sizeof(*zpci_iomap_start), GFP_KERNEL);
904 if (!zpci_iomap_start)
905 goto error_iomap;
906
907 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
908 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
909 if (!zpci_iomap_bitmap)
910 goto error_iomap_bitmap;
911
912 if (static_branch_likely(&have_mio))
913 clp_setup_writeback_mio();
914
915 return 0;
916error_iomap_bitmap:
917 kfree(zpci_iomap_start);
918error_iomap:
919 kmem_cache_destroy(zdev_fmb_cache);
920error_fmb:
921 return -ENOMEM;
922}
923
924static void zpci_mem_exit(void)
925{
926 kfree(zpci_iomap_bitmap);
927 kfree(zpci_iomap_start);
928 kmem_cache_destroy(zdev_fmb_cache);
929}
930
931static unsigned int s390_pci_probe __initdata = 1;
932unsigned int s390_pci_force_floating __initdata;
933static unsigned int s390_pci_initialized;
934
935char * __init pcibios_setup(char *str)
936{
937 if (!strcmp(str, "off")) {
938 s390_pci_probe = 0;
939 return NULL;
940 }
941 if (!strcmp(str, "nomio")) {
942 S390_lowcore.machine_flags &= ~MACHINE_FLAG_PCI_MIO;
943 return NULL;
944 }
945 if (!strcmp(str, "force_floating")) {
946 s390_pci_force_floating = 1;
947 return NULL;
948 }
949 if (!strcmp(str, "norid")) {
950 s390_pci_no_rid = 1;
951 return NULL;
952 }
953 return str;
954}
955
956bool zpci_is_enabled(void)
957{
958 return s390_pci_initialized;
959}
960
961static int __init pci_base_init(void)
962{
963 int rc;
964
965 if (!s390_pci_probe)
966 return 0;
967
968 if (!test_facility(69) || !test_facility(71)) {
969 pr_info("PCI is not supported because CPU facilities 69 or 71 are not available\n");
970 return 0;
971 }
972
973 if (MACHINE_HAS_PCI_MIO) {
974 static_branch_enable(&have_mio);
975 ctl_set_bit(2, 5);
976 }
977
978 rc = zpci_debug_init();
979 if (rc)
980 goto out;
981
982 rc = zpci_mem_init();
983 if (rc)
984 goto out_mem;
985
986 rc = zpci_irq_init();
987 if (rc)
988 goto out_irq;
989
990 rc = zpci_dma_init();
991 if (rc)
992 goto out_dma;
993
994 rc = clp_scan_pci_devices();
995 if (rc)
996 goto out_find;
997 zpci_bus_scan_busses();
998
999 s390_pci_initialized = 1;
1000 return 0;
1001
1002out_find:
1003 zpci_dma_exit();
1004out_dma:
1005 zpci_irq_exit();
1006out_irq:
1007 zpci_mem_exit();
1008out_mem:
1009 zpci_debug_exit();
1010out:
1011 return rc;
1012}
1013subsys_initcall_sync(pci_base_init);