xref: /openbmc/linux/arch/s390/pci/pci.c (revision 4da722ca)
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 */
48 static LIST_HEAD(zpci_list);
49 static DEFINE_SPINLOCK(zpci_list_lock);
50 
51 static 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 
57 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
58 static DEFINE_SPINLOCK(zpci_domain_lock);
59 
60 static struct airq_iv *zpci_aisb_iv;
61 static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];
62 
63 #define ZPCI_IOMAP_ENTRIES						\
64 	min(((unsigned long) ZPCI_NR_DEVICES * PCI_BAR_COUNT / 2),	\
65 	    ZPCI_IOMAP_MAX_ENTRIES)
66 
67 static DEFINE_SPINLOCK(zpci_iomap_lock);
68 static unsigned long *zpci_iomap_bitmap;
69 struct zpci_iomap_entry *zpci_iomap_start;
70 EXPORT_SYMBOL_GPL(zpci_iomap_start);
71 
72 static struct kmem_cache *zdev_fmb_cache;
73 
74 struct zpci_dev *get_zdev_by_fid(u32 fid)
75 {
76 	struct zpci_dev *tmp, *zdev = NULL;
77 
78 	spin_lock(&zpci_list_lock);
79 	list_for_each_entry(tmp, &zpci_list, entry) {
80 		if (tmp->fid == fid) {
81 			zdev = tmp;
82 			break;
83 		}
84 	}
85 	spin_unlock(&zpci_list_lock);
86 	return zdev;
87 }
88 
89 void zpci_remove_reserved_devices(void)
90 {
91 	struct zpci_dev *tmp, *zdev;
92 	enum zpci_state state;
93 	LIST_HEAD(remove);
94 
95 	spin_lock(&zpci_list_lock);
96 	list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
97 		if (zdev->state == ZPCI_FN_STATE_STANDBY &&
98 		    !clp_get_state(zdev->fid, &state) &&
99 		    state == ZPCI_FN_STATE_RESERVED)
100 			list_move_tail(&zdev->entry, &remove);
101 	}
102 	spin_unlock(&zpci_list_lock);
103 
104 	list_for_each_entry_safe(zdev, tmp, &remove, entry)
105 		zpci_remove_device(zdev);
106 }
107 
108 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
109 {
110 	return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
111 }
112 
113 int pci_domain_nr(struct pci_bus *bus)
114 {
115 	return ((struct zpci_dev *) bus->sysdata)->domain;
116 }
117 EXPORT_SYMBOL_GPL(pci_domain_nr);
118 
119 int pci_proc_domain(struct pci_bus *bus)
120 {
121 	return pci_domain_nr(bus);
122 }
123 EXPORT_SYMBOL_GPL(pci_proc_domain);
124 
125 /* Modify PCI: Register adapter interruptions */
126 static int zpci_set_airq(struct zpci_dev *zdev)
127 {
128 	u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
129 	struct zpci_fib fib = {0};
130 	u8 status;
131 
132 	fib.isc = PCI_ISC;
133 	fib.sum = 1;		/* enable summary notifications */
134 	fib.noi = airq_iv_end(zdev->aibv);
135 	fib.aibv = (unsigned long) zdev->aibv->vector;
136 	fib.aibvo = 0;		/* each zdev has its own interrupt vector */
137 	fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
138 	fib.aisbo = zdev->aisb & 63;
139 
140 	return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
141 }
142 
143 /* Modify PCI: Unregister adapter interruptions */
144 static int zpci_clear_airq(struct zpci_dev *zdev)
145 {
146 	u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_DEREG_INT);
147 	struct zpci_fib fib = {0};
148 	u8 cc, status;
149 
150 	cc = zpci_mod_fc(req, &fib, &status);
151 	if (cc == 3 || (cc == 1 && status == 24))
152 		/* Function already gone or IRQs already deregistered. */
153 		cc = 0;
154 
155 	return cc ? -EIO : 0;
156 }
157 
158 /* Modify PCI: Register I/O address translation parameters */
159 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
160 		       u64 base, u64 limit, u64 iota)
161 {
162 	u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
163 	struct zpci_fib fib = {0};
164 	u8 status;
165 
166 	WARN_ON_ONCE(iota & 0x3fff);
167 	fib.pba = base;
168 	fib.pal = limit;
169 	fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
170 	return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
171 }
172 
173 /* Modify PCI: Unregister I/O address translation parameters */
174 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
175 {
176 	u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
177 	struct zpci_fib fib = {0};
178 	u8 cc, status;
179 
180 	cc = zpci_mod_fc(req, &fib, &status);
181 	if (cc == 3) /* Function already gone. */
182 		cc = 0;
183 	return cc ? -EIO : 0;
184 }
185 
186 /* Modify PCI: Set PCI function measurement parameters */
187 int zpci_fmb_enable_device(struct zpci_dev *zdev)
188 {
189 	u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
190 	struct zpci_fib fib = {0};
191 	u8 cc, status;
192 
193 	if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
194 		return -EINVAL;
195 
196 	zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
197 	if (!zdev->fmb)
198 		return -ENOMEM;
199 	WARN_ON((u64) zdev->fmb & 0xf);
200 
201 	/* reset software counters */
202 	atomic64_set(&zdev->allocated_pages, 0);
203 	atomic64_set(&zdev->mapped_pages, 0);
204 	atomic64_set(&zdev->unmapped_pages, 0);
205 
206 	fib.fmb_addr = virt_to_phys(zdev->fmb);
207 	cc = zpci_mod_fc(req, &fib, &status);
208 	if (cc) {
209 		kmem_cache_free(zdev_fmb_cache, zdev->fmb);
210 		zdev->fmb = NULL;
211 	}
212 	return cc ? -EIO : 0;
213 }
214 
215 /* Modify PCI: Disable PCI function measurement */
216 int zpci_fmb_disable_device(struct zpci_dev *zdev)
217 {
218 	u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
219 	struct zpci_fib fib = {0};
220 	u8 cc, status;
221 
222 	if (!zdev->fmb)
223 		return -EINVAL;
224 
225 	/* Function measurement is disabled if fmb address is zero */
226 	cc = zpci_mod_fc(req, &fib, &status);
227 	if (cc == 3) /* Function already gone. */
228 		cc = 0;
229 
230 	if (!cc) {
231 		kmem_cache_free(zdev_fmb_cache, zdev->fmb);
232 		zdev->fmb = NULL;
233 	}
234 	return cc ? -EIO : 0;
235 }
236 
237 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
238 {
239 	u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
240 	u64 data;
241 	int rc;
242 
243 	rc = zpci_load(&data, req, offset);
244 	if (!rc) {
245 		data = le64_to_cpu((__force __le64) data);
246 		data >>= (8 - len) * 8;
247 		*val = (u32) data;
248 	} else
249 		*val = 0xffffffff;
250 	return rc;
251 }
252 
253 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
254 {
255 	u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
256 	u64 data = val;
257 	int rc;
258 
259 	data <<= (8 - len) * 8;
260 	data = (__force u64) cpu_to_le64(data);
261 	rc = zpci_store(data, req, offset);
262 	return rc;
263 }
264 
265 void pcibios_fixup_bus(struct pci_bus *bus)
266 {
267 }
268 
269 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
270 				       resource_size_t size,
271 				       resource_size_t align)
272 {
273 	return 0;
274 }
275 
276 /* combine single writes by using store-block insn */
277 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
278 {
279        zpci_memcpy_toio(to, from, count);
280 }
281 
282 /* Create a virtual mapping cookie for a PCI BAR */
283 void __iomem *pci_iomap_range(struct pci_dev *pdev,
284 			      int bar,
285 			      unsigned long offset,
286 			      unsigned long max)
287 {
288 	struct zpci_dev *zdev =	to_zpci(pdev);
289 	int idx;
290 
291 	if (!pci_resource_len(pdev, bar))
292 		return NULL;
293 
294 	idx = zdev->bars[bar].map_idx;
295 	spin_lock(&zpci_iomap_lock);
296 	/* Detect overrun */
297 	WARN_ON(!++zpci_iomap_start[idx].count);
298 	zpci_iomap_start[idx].fh = zdev->fh;
299 	zpci_iomap_start[idx].bar = bar;
300 	spin_unlock(&zpci_iomap_lock);
301 
302 	return (void __iomem *) ZPCI_ADDR(idx) + offset;
303 }
304 EXPORT_SYMBOL(pci_iomap_range);
305 
306 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
307 {
308 	return pci_iomap_range(dev, bar, 0, maxlen);
309 }
310 EXPORT_SYMBOL(pci_iomap);
311 
312 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
313 {
314 	unsigned int idx = ZPCI_IDX(addr);
315 
316 	spin_lock(&zpci_iomap_lock);
317 	/* Detect underrun */
318 	WARN_ON(!zpci_iomap_start[idx].count);
319 	if (!--zpci_iomap_start[idx].count) {
320 		zpci_iomap_start[idx].fh = 0;
321 		zpci_iomap_start[idx].bar = 0;
322 	}
323 	spin_unlock(&zpci_iomap_lock);
324 }
325 EXPORT_SYMBOL(pci_iounmap);
326 
327 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
328 		    int size, u32 *val)
329 {
330 	struct zpci_dev *zdev = get_zdev_by_bus(bus);
331 	int ret;
332 
333 	if (!zdev || devfn != ZPCI_DEVFN)
334 		ret = -ENODEV;
335 	else
336 		ret = zpci_cfg_load(zdev, where, val, size);
337 
338 	return ret;
339 }
340 
341 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
342 		     int size, u32 val)
343 {
344 	struct zpci_dev *zdev = get_zdev_by_bus(bus);
345 	int ret;
346 
347 	if (!zdev || devfn != ZPCI_DEVFN)
348 		ret = -ENODEV;
349 	else
350 		ret = zpci_cfg_store(zdev, where, val, size);
351 
352 	return ret;
353 }
354 
355 static struct pci_ops pci_root_ops = {
356 	.read = pci_read,
357 	.write = pci_write,
358 };
359 
360 static void zpci_irq_handler(struct airq_struct *airq)
361 {
362 	unsigned long si, ai;
363 	struct airq_iv *aibv;
364 	int irqs_on = 0;
365 
366 	inc_irq_stat(IRQIO_PCI);
367 	for (si = 0;;) {
368 		/* Scan adapter summary indicator bit vector */
369 		si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
370 		if (si == -1UL) {
371 			if (irqs_on++)
372 				/* End of second scan with interrupts on. */
373 				break;
374 			/* First scan complete, reenable interrupts. */
375 			zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
376 			si = 0;
377 			continue;
378 		}
379 
380 		/* Scan the adapter interrupt vector for this device. */
381 		aibv = zpci_aibv[si];
382 		for (ai = 0;;) {
383 			ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
384 			if (ai == -1UL)
385 				break;
386 			inc_irq_stat(IRQIO_MSI);
387 			airq_iv_lock(aibv, ai);
388 			generic_handle_irq(airq_iv_get_data(aibv, ai));
389 			airq_iv_unlock(aibv, ai);
390 		}
391 	}
392 }
393 
394 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
395 {
396 	struct zpci_dev *zdev = to_zpci(pdev);
397 	unsigned int hwirq, msi_vecs;
398 	unsigned long aisb;
399 	struct msi_desc *msi;
400 	struct msi_msg msg;
401 	int rc, irq;
402 
403 	zdev->aisb = -1UL;
404 	if (type == PCI_CAP_ID_MSI && nvec > 1)
405 		return 1;
406 	msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
407 
408 	/* Allocate adapter summary indicator bit */
409 	aisb = airq_iv_alloc_bit(zpci_aisb_iv);
410 	if (aisb == -1UL)
411 		return -EIO;
412 	zdev->aisb = aisb;
413 
414 	/* Create adapter interrupt vector */
415 	zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
416 	if (!zdev->aibv)
417 		return -ENOMEM;
418 
419 	/* Wire up shortcut pointer */
420 	zpci_aibv[aisb] = zdev->aibv;
421 
422 	/* Request MSI interrupts */
423 	hwirq = 0;
424 	for_each_pci_msi_entry(msi, pdev) {
425 		rc = -EIO;
426 		irq = irq_alloc_desc(0);	/* Alloc irq on node 0 */
427 		if (irq < 0)
428 			return -ENOMEM;
429 		rc = irq_set_msi_desc(irq, msi);
430 		if (rc)
431 			return rc;
432 		irq_set_chip_and_handler(irq, &zpci_irq_chip,
433 					 handle_simple_irq);
434 		msg.data = hwirq;
435 		msg.address_lo = zdev->msi_addr & 0xffffffff;
436 		msg.address_hi = zdev->msi_addr >> 32;
437 		pci_write_msi_msg(irq, &msg);
438 		airq_iv_set_data(zdev->aibv, hwirq, irq);
439 		hwirq++;
440 	}
441 
442 	/* Enable adapter interrupts */
443 	rc = zpci_set_airq(zdev);
444 	if (rc)
445 		return rc;
446 
447 	return (msi_vecs == nvec) ? 0 : msi_vecs;
448 }
449 
450 void arch_teardown_msi_irqs(struct pci_dev *pdev)
451 {
452 	struct zpci_dev *zdev = to_zpci(pdev);
453 	struct msi_desc *msi;
454 	int rc;
455 
456 	/* Disable adapter interrupts */
457 	rc = zpci_clear_airq(zdev);
458 	if (rc)
459 		return;
460 
461 	/* Release MSI interrupts */
462 	for_each_pci_msi_entry(msi, pdev) {
463 		if (!msi->irq)
464 			continue;
465 		if (msi->msi_attrib.is_msix)
466 			__pci_msix_desc_mask_irq(msi, 1);
467 		else
468 			__pci_msi_desc_mask_irq(msi, 1, 1);
469 		irq_set_msi_desc(msi->irq, NULL);
470 		irq_free_desc(msi->irq);
471 		msi->msg.address_lo = 0;
472 		msi->msg.address_hi = 0;
473 		msi->msg.data = 0;
474 		msi->irq = 0;
475 	}
476 
477 	if (zdev->aisb != -1UL) {
478 		zpci_aibv[zdev->aisb] = NULL;
479 		airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
480 		zdev->aisb = -1UL;
481 	}
482 	if (zdev->aibv) {
483 		airq_iv_release(zdev->aibv);
484 		zdev->aibv = NULL;
485 	}
486 }
487 
488 static void zpci_map_resources(struct pci_dev *pdev)
489 {
490 	resource_size_t len;
491 	int i;
492 
493 	for (i = 0; i < PCI_BAR_COUNT; i++) {
494 		len = pci_resource_len(pdev, i);
495 		if (!len)
496 			continue;
497 		pdev->resource[i].start =
498 			(resource_size_t __force) pci_iomap(pdev, i, 0);
499 		pdev->resource[i].end = pdev->resource[i].start + len - 1;
500 	}
501 }
502 
503 static void zpci_unmap_resources(struct pci_dev *pdev)
504 {
505 	resource_size_t len;
506 	int i;
507 
508 	for (i = 0; i < PCI_BAR_COUNT; i++) {
509 		len = pci_resource_len(pdev, i);
510 		if (!len)
511 			continue;
512 		pci_iounmap(pdev, (void __iomem __force *)
513 			    pdev->resource[i].start);
514 	}
515 }
516 
517 static struct airq_struct zpci_airq = {
518 	.handler = zpci_irq_handler,
519 	.isc = PCI_ISC,
520 };
521 
522 static int __init zpci_irq_init(void)
523 {
524 	int rc;
525 
526 	rc = register_adapter_interrupt(&zpci_airq);
527 	if (rc)
528 		goto out;
529 	/* Set summary to 1 to be called every time for the ISC. */
530 	*zpci_airq.lsi_ptr = 1;
531 
532 	rc = -ENOMEM;
533 	zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
534 	if (!zpci_aisb_iv)
535 		goto out_airq;
536 
537 	zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
538 	return 0;
539 
540 out_airq:
541 	unregister_adapter_interrupt(&zpci_airq);
542 out:
543 	return rc;
544 }
545 
546 static void zpci_irq_exit(void)
547 {
548 	airq_iv_release(zpci_aisb_iv);
549 	unregister_adapter_interrupt(&zpci_airq);
550 }
551 
552 static int zpci_alloc_iomap(struct zpci_dev *zdev)
553 {
554 	unsigned long entry;
555 
556 	spin_lock(&zpci_iomap_lock);
557 	entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
558 	if (entry == ZPCI_IOMAP_ENTRIES) {
559 		spin_unlock(&zpci_iomap_lock);
560 		return -ENOSPC;
561 	}
562 	set_bit(entry, zpci_iomap_bitmap);
563 	spin_unlock(&zpci_iomap_lock);
564 	return entry;
565 }
566 
567 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
568 {
569 	spin_lock(&zpci_iomap_lock);
570 	memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
571 	clear_bit(entry, zpci_iomap_bitmap);
572 	spin_unlock(&zpci_iomap_lock);
573 }
574 
575 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
576 				    unsigned long size, unsigned long flags)
577 {
578 	struct resource *r;
579 
580 	r = kzalloc(sizeof(*r), GFP_KERNEL);
581 	if (!r)
582 		return NULL;
583 
584 	r->start = start;
585 	r->end = r->start + size - 1;
586 	r->flags = flags;
587 	r->name = zdev->res_name;
588 
589 	if (request_resource(&iomem_resource, r)) {
590 		kfree(r);
591 		return NULL;
592 	}
593 	return r;
594 }
595 
596 static int zpci_setup_bus_resources(struct zpci_dev *zdev,
597 				    struct list_head *resources)
598 {
599 	unsigned long addr, size, flags;
600 	struct resource *res;
601 	int i, entry;
602 
603 	snprintf(zdev->res_name, sizeof(zdev->res_name),
604 		 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
605 
606 	for (i = 0; i < PCI_BAR_COUNT; i++) {
607 		if (!zdev->bars[i].size)
608 			continue;
609 		entry = zpci_alloc_iomap(zdev);
610 		if (entry < 0)
611 			return entry;
612 		zdev->bars[i].map_idx = entry;
613 
614 		/* only MMIO is supported */
615 		flags = IORESOURCE_MEM;
616 		if (zdev->bars[i].val & 8)
617 			flags |= IORESOURCE_PREFETCH;
618 		if (zdev->bars[i].val & 4)
619 			flags |= IORESOURCE_MEM_64;
620 
621 		addr = ZPCI_ADDR(entry);
622 		size = 1UL << zdev->bars[i].size;
623 
624 		res = __alloc_res(zdev, addr, size, flags);
625 		if (!res) {
626 			zpci_free_iomap(zdev, entry);
627 			return -ENOMEM;
628 		}
629 		zdev->bars[i].res = res;
630 		pci_add_resource(resources, res);
631 	}
632 
633 	return 0;
634 }
635 
636 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
637 {
638 	int i;
639 
640 	for (i = 0; i < PCI_BAR_COUNT; i++) {
641 		if (!zdev->bars[i].size || !zdev->bars[i].res)
642 			continue;
643 
644 		zpci_free_iomap(zdev, zdev->bars[i].map_idx);
645 		release_resource(zdev->bars[i].res);
646 		kfree(zdev->bars[i].res);
647 	}
648 }
649 
650 int pcibios_add_device(struct pci_dev *pdev)
651 {
652 	struct resource *res;
653 	int i;
654 
655 	pdev->dev.groups = zpci_attr_groups;
656 	pdev->dev.dma_ops = &s390_pci_dma_ops;
657 	zpci_map_resources(pdev);
658 
659 	for (i = 0; i < PCI_BAR_COUNT; i++) {
660 		res = &pdev->resource[i];
661 		if (res->parent || !res->flags)
662 			continue;
663 		pci_claim_resource(pdev, i);
664 	}
665 
666 	return 0;
667 }
668 
669 void pcibios_release_device(struct pci_dev *pdev)
670 {
671 	zpci_unmap_resources(pdev);
672 }
673 
674 int pcibios_enable_device(struct pci_dev *pdev, int mask)
675 {
676 	struct zpci_dev *zdev = to_zpci(pdev);
677 
678 	zpci_debug_init_device(zdev, dev_name(&pdev->dev));
679 	zpci_fmb_enable_device(zdev);
680 
681 	return pci_enable_resources(pdev, mask);
682 }
683 
684 void pcibios_disable_device(struct pci_dev *pdev)
685 {
686 	struct zpci_dev *zdev = to_zpci(pdev);
687 
688 	zpci_fmb_disable_device(zdev);
689 	zpci_debug_exit_device(zdev);
690 }
691 
692 #ifdef CONFIG_HIBERNATE_CALLBACKS
693 static int zpci_restore(struct device *dev)
694 {
695 	struct pci_dev *pdev = to_pci_dev(dev);
696 	struct zpci_dev *zdev = to_zpci(pdev);
697 	int ret = 0;
698 
699 	if (zdev->state != ZPCI_FN_STATE_ONLINE)
700 		goto out;
701 
702 	ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
703 	if (ret)
704 		goto out;
705 
706 	zpci_map_resources(pdev);
707 	zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
708 			   (u64) zdev->dma_table);
709 
710 out:
711 	return ret;
712 }
713 
714 static int zpci_freeze(struct device *dev)
715 {
716 	struct pci_dev *pdev = to_pci_dev(dev);
717 	struct zpci_dev *zdev = to_zpci(pdev);
718 
719 	if (zdev->state != ZPCI_FN_STATE_ONLINE)
720 		return 0;
721 
722 	zpci_unregister_ioat(zdev, 0);
723 	zpci_unmap_resources(pdev);
724 	return clp_disable_fh(zdev);
725 }
726 
727 struct dev_pm_ops pcibios_pm_ops = {
728 	.thaw_noirq = zpci_restore,
729 	.freeze_noirq = zpci_freeze,
730 	.restore_noirq = zpci_restore,
731 	.poweroff_noirq = zpci_freeze,
732 };
733 #endif /* CONFIG_HIBERNATE_CALLBACKS */
734 
735 static int zpci_alloc_domain(struct zpci_dev *zdev)
736 {
737 	if (zpci_unique_uid) {
738 		zdev->domain = (u16) zdev->uid;
739 		if (zdev->domain >= ZPCI_NR_DEVICES)
740 			return 0;
741 
742 		spin_lock(&zpci_domain_lock);
743 		if (test_bit(zdev->domain, zpci_domain)) {
744 			spin_unlock(&zpci_domain_lock);
745 			return -EEXIST;
746 		}
747 		set_bit(zdev->domain, zpci_domain);
748 		spin_unlock(&zpci_domain_lock);
749 		return 0;
750 	}
751 
752 	spin_lock(&zpci_domain_lock);
753 	zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
754 	if (zdev->domain == ZPCI_NR_DEVICES) {
755 		spin_unlock(&zpci_domain_lock);
756 		return -ENOSPC;
757 	}
758 	set_bit(zdev->domain, zpci_domain);
759 	spin_unlock(&zpci_domain_lock);
760 	return 0;
761 }
762 
763 static void zpci_free_domain(struct zpci_dev *zdev)
764 {
765 	if (zdev->domain >= ZPCI_NR_DEVICES)
766 		return;
767 
768 	spin_lock(&zpci_domain_lock);
769 	clear_bit(zdev->domain, zpci_domain);
770 	spin_unlock(&zpci_domain_lock);
771 }
772 
773 void pcibios_remove_bus(struct pci_bus *bus)
774 {
775 	struct zpci_dev *zdev = get_zdev_by_bus(bus);
776 
777 	zpci_exit_slot(zdev);
778 	zpci_cleanup_bus_resources(zdev);
779 	zpci_free_domain(zdev);
780 
781 	spin_lock(&zpci_list_lock);
782 	list_del(&zdev->entry);
783 	spin_unlock(&zpci_list_lock);
784 
785 	zpci_dbg(3, "rem fid:%x\n", zdev->fid);
786 	kfree(zdev);
787 }
788 
789 static int zpci_scan_bus(struct zpci_dev *zdev)
790 {
791 	LIST_HEAD(resources);
792 	int ret;
793 
794 	ret = zpci_setup_bus_resources(zdev, &resources);
795 	if (ret)
796 		goto error;
797 
798 	zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
799 				      zdev, &resources);
800 	if (!zdev->bus) {
801 		ret = -EIO;
802 		goto error;
803 	}
804 	zdev->bus->max_bus_speed = zdev->max_bus_speed;
805 	pci_bus_add_devices(zdev->bus);
806 	return 0;
807 
808 error:
809 	zpci_cleanup_bus_resources(zdev);
810 	pci_free_resource_list(&resources);
811 	return ret;
812 }
813 
814 int zpci_enable_device(struct zpci_dev *zdev)
815 {
816 	int rc;
817 
818 	rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
819 	if (rc)
820 		goto out;
821 
822 	rc = zpci_dma_init_device(zdev);
823 	if (rc)
824 		goto out_dma;
825 
826 	zdev->state = ZPCI_FN_STATE_ONLINE;
827 	return 0;
828 
829 out_dma:
830 	clp_disable_fh(zdev);
831 out:
832 	return rc;
833 }
834 EXPORT_SYMBOL_GPL(zpci_enable_device);
835 
836 int zpci_disable_device(struct zpci_dev *zdev)
837 {
838 	zpci_dma_exit_device(zdev);
839 	return clp_disable_fh(zdev);
840 }
841 EXPORT_SYMBOL_GPL(zpci_disable_device);
842 
843 int zpci_create_device(struct zpci_dev *zdev)
844 {
845 	int rc;
846 
847 	rc = zpci_alloc_domain(zdev);
848 	if (rc)
849 		goto out;
850 
851 	mutex_init(&zdev->lock);
852 	if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
853 		rc = zpci_enable_device(zdev);
854 		if (rc)
855 			goto out_free;
856 	}
857 	rc = zpci_scan_bus(zdev);
858 	if (rc)
859 		goto out_disable;
860 
861 	spin_lock(&zpci_list_lock);
862 	list_add_tail(&zdev->entry, &zpci_list);
863 	spin_unlock(&zpci_list_lock);
864 
865 	zpci_init_slot(zdev);
866 
867 	return 0;
868 
869 out_disable:
870 	if (zdev->state == ZPCI_FN_STATE_ONLINE)
871 		zpci_disable_device(zdev);
872 out_free:
873 	zpci_free_domain(zdev);
874 out:
875 	return rc;
876 }
877 
878 void zpci_remove_device(struct zpci_dev *zdev)
879 {
880 	if (!zdev->bus)
881 		return;
882 
883 	pci_stop_root_bus(zdev->bus);
884 	pci_remove_root_bus(zdev->bus);
885 }
886 
887 int zpci_report_error(struct pci_dev *pdev,
888 		      struct zpci_report_error_header *report)
889 {
890 	struct zpci_dev *zdev = to_zpci(pdev);
891 
892 	return sclp_pci_report(report, zdev->fh, zdev->fid);
893 }
894 EXPORT_SYMBOL(zpci_report_error);
895 
896 static int zpci_mem_init(void)
897 {
898 	BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
899 		     __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
900 
901 	zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
902 					   __alignof__(struct zpci_fmb), 0, NULL);
903 	if (!zdev_fmb_cache)
904 		goto error_fmb;
905 
906 	zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
907 				   sizeof(*zpci_iomap_start), GFP_KERNEL);
908 	if (!zpci_iomap_start)
909 		goto error_iomap;
910 
911 	zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
912 				    sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
913 	if (!zpci_iomap_bitmap)
914 		goto error_iomap_bitmap;
915 
916 	return 0;
917 error_iomap_bitmap:
918 	kfree(zpci_iomap_start);
919 error_iomap:
920 	kmem_cache_destroy(zdev_fmb_cache);
921 error_fmb:
922 	return -ENOMEM;
923 }
924 
925 static void zpci_mem_exit(void)
926 {
927 	kfree(zpci_iomap_bitmap);
928 	kfree(zpci_iomap_start);
929 	kmem_cache_destroy(zdev_fmb_cache);
930 }
931 
932 static unsigned int s390_pci_probe = 1;
933 static unsigned int s390_pci_initialized;
934 
935 char * __init pcibios_setup(char *str)
936 {
937 	if (!strcmp(str, "off")) {
938 		s390_pci_probe = 0;
939 		return NULL;
940 	}
941 	return str;
942 }
943 
944 bool zpci_is_enabled(void)
945 {
946 	return s390_pci_initialized;
947 }
948 
949 static int __init pci_base_init(void)
950 {
951 	int rc;
952 
953 	if (!s390_pci_probe)
954 		return 0;
955 
956 	if (!test_facility(69) || !test_facility(71) || !test_facility(72))
957 		return 0;
958 
959 	rc = zpci_debug_init();
960 	if (rc)
961 		goto out;
962 
963 	rc = zpci_mem_init();
964 	if (rc)
965 		goto out_mem;
966 
967 	rc = zpci_irq_init();
968 	if (rc)
969 		goto out_irq;
970 
971 	rc = zpci_dma_init();
972 	if (rc)
973 		goto out_dma;
974 
975 	rc = clp_scan_pci_devices();
976 	if (rc)
977 		goto out_find;
978 
979 	s390_pci_initialized = 1;
980 	return 0;
981 
982 out_find:
983 	zpci_dma_exit();
984 out_dma:
985 	zpci_irq_exit();
986 out_irq:
987 	zpci_mem_exit();
988 out_mem:
989 	zpci_debug_exit();
990 out:
991 	return rc;
992 }
993 subsys_initcall_sync(pci_base_init);
994 
995 void zpci_rescan(void)
996 {
997 	if (zpci_is_enabled())
998 		clp_rescan_pci_devices_simple();
999 }
1000