xref: /openbmc/linux/arch/s390/pci/pci.c (revision bc05aa6e)
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/irq.h>
28 #include <linux/kernel_stat.h>
29 #include <linux/seq_file.h>
30 #include <linux/pci.h>
31 #include <linux/msi.h>
32 
33 #include <asm/isc.h>
34 #include <asm/airq.h>
35 #include <asm/facility.h>
36 #include <asm/pci_insn.h>
37 #include <asm/pci_clp.h>
38 #include <asm/pci_dma.h>
39 
40 #define DEBUG				/* enable pr_debug */
41 
42 #define	SIC_IRQ_MODE_ALL		0
43 #define	SIC_IRQ_MODE_SINGLE		1
44 
45 #define ZPCI_NR_DMA_SPACES		1
46 #define ZPCI_NR_DEVICES			CONFIG_PCI_NR_FUNCTIONS
47 
48 /* list of all detected zpci devices */
49 static LIST_HEAD(zpci_list);
50 static DEFINE_SPINLOCK(zpci_list_lock);
51 
52 static struct irq_chip zpci_irq_chip = {
53 	.name = "zPCI",
54 	.irq_unmask = pci_msi_unmask_irq,
55 	.irq_mask = pci_msi_mask_irq,
56 };
57 
58 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
59 static DEFINE_SPINLOCK(zpci_domain_lock);
60 
61 static struct airq_iv *zpci_aisb_iv;
62 static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];
63 
64 #define ZPCI_IOMAP_ENTRIES						\
65 	min(((unsigned long) ZPCI_NR_DEVICES * PCI_BAR_COUNT / 2),	\
66 	    ZPCI_IOMAP_MAX_ENTRIES)
67 
68 static DEFINE_SPINLOCK(zpci_iomap_lock);
69 static unsigned long *zpci_iomap_bitmap;
70 struct zpci_iomap_entry *zpci_iomap_start;
71 EXPORT_SYMBOL_GPL(zpci_iomap_start);
72 
73 static struct kmem_cache *zdev_fmb_cache;
74 
75 struct zpci_dev *get_zdev_by_fid(u32 fid)
76 {
77 	struct zpci_dev *tmp, *zdev = NULL;
78 
79 	spin_lock(&zpci_list_lock);
80 	list_for_each_entry(tmp, &zpci_list, entry) {
81 		if (tmp->fid == fid) {
82 			zdev = tmp;
83 			break;
84 		}
85 	}
86 	spin_unlock(&zpci_list_lock);
87 	return zdev;
88 }
89 
90 void zpci_remove_reserved_devices(void)
91 {
92 	struct zpci_dev *tmp, *zdev;
93 	enum zpci_state state;
94 	LIST_HEAD(remove);
95 
96 	spin_lock(&zpci_list_lock);
97 	list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
98 		if (zdev->state == ZPCI_FN_STATE_STANDBY &&
99 		    !clp_get_state(zdev->fid, &state) &&
100 		    state == ZPCI_FN_STATE_RESERVED)
101 			list_move_tail(&zdev->entry, &remove);
102 	}
103 	spin_unlock(&zpci_list_lock);
104 
105 	list_for_each_entry_safe(zdev, tmp, &remove, entry)
106 		zpci_remove_device(zdev);
107 }
108 
109 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
110 {
111 	return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
112 }
113 
114 int pci_domain_nr(struct pci_bus *bus)
115 {
116 	return ((struct zpci_dev *) bus->sysdata)->domain;
117 }
118 EXPORT_SYMBOL_GPL(pci_domain_nr);
119 
120 int pci_proc_domain(struct pci_bus *bus)
121 {
122 	return pci_domain_nr(bus);
123 }
124 EXPORT_SYMBOL_GPL(pci_proc_domain);
125 
126 /* Modify PCI: Register adapter interruptions */
127 static int zpci_set_airq(struct zpci_dev *zdev)
128 {
129 	u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
130 	struct zpci_fib fib = {0};
131 	u8 status;
132 
133 	fib.isc = PCI_ISC;
134 	fib.sum = 1;		/* enable summary notifications */
135 	fib.noi = airq_iv_end(zdev->aibv);
136 	fib.aibv = (unsigned long) zdev->aibv->vector;
137 	fib.aibvo = 0;		/* each zdev has its own interrupt vector */
138 	fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
139 	fib.aisbo = zdev->aisb & 63;
140 
141 	return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
142 }
143 
144 /* Modify PCI: Unregister adapter interruptions */
145 static int zpci_clear_airq(struct zpci_dev *zdev)
146 {
147 	u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_DEREG_INT);
148 	struct zpci_fib fib = {0};
149 	u8 cc, status;
150 
151 	cc = zpci_mod_fc(req, &fib, &status);
152 	if (cc == 3 || (cc == 1 && status == 24))
153 		/* Function already gone or IRQs already deregistered. */
154 		cc = 0;
155 
156 	return cc ? -EIO : 0;
157 }
158 
159 /* Modify PCI: Register I/O address translation parameters */
160 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
161 		       u64 base, u64 limit, u64 iota)
162 {
163 	u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
164 	struct zpci_fib fib = {0};
165 	u8 status;
166 
167 	WARN_ON_ONCE(iota & 0x3fff);
168 	fib.pba = base;
169 	fib.pal = limit;
170 	fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
171 	return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
172 }
173 
174 /* Modify PCI: Unregister I/O address translation parameters */
175 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
176 {
177 	u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
178 	struct zpci_fib fib = {0};
179 	u8 cc, status;
180 
181 	cc = zpci_mod_fc(req, &fib, &status);
182 	if (cc == 3) /* Function already gone. */
183 		cc = 0;
184 	return cc ? -EIO : 0;
185 }
186 
187 /* Modify PCI: Set PCI function measurement parameters */
188 int zpci_fmb_enable_device(struct zpci_dev *zdev)
189 {
190 	u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
191 	struct zpci_fib fib = {0};
192 	u8 cc, status;
193 
194 	if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
195 		return -EINVAL;
196 
197 	zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
198 	if (!zdev->fmb)
199 		return -ENOMEM;
200 	WARN_ON((u64) zdev->fmb & 0xf);
201 
202 	/* reset software counters */
203 	atomic64_set(&zdev->allocated_pages, 0);
204 	atomic64_set(&zdev->mapped_pages, 0);
205 	atomic64_set(&zdev->unmapped_pages, 0);
206 
207 	fib.fmb_addr = virt_to_phys(zdev->fmb);
208 	cc = zpci_mod_fc(req, &fib, &status);
209 	if (cc) {
210 		kmem_cache_free(zdev_fmb_cache, zdev->fmb);
211 		zdev->fmb = NULL;
212 	}
213 	return cc ? -EIO : 0;
214 }
215 
216 /* Modify PCI: Disable PCI function measurement */
217 int zpci_fmb_disable_device(struct zpci_dev *zdev)
218 {
219 	u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
220 	struct zpci_fib fib = {0};
221 	u8 cc, status;
222 
223 	if (!zdev->fmb)
224 		return -EINVAL;
225 
226 	/* Function measurement is disabled if fmb address is zero */
227 	cc = zpci_mod_fc(req, &fib, &status);
228 	if (cc == 3) /* Function already gone. */
229 		cc = 0;
230 
231 	if (!cc) {
232 		kmem_cache_free(zdev_fmb_cache, zdev->fmb);
233 		zdev->fmb = NULL;
234 	}
235 	return cc ? -EIO : 0;
236 }
237 
238 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
239 {
240 	u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
241 	u64 data;
242 	int rc;
243 
244 	rc = zpci_load(&data, req, offset);
245 	if (!rc) {
246 		data = le64_to_cpu((__force __le64) data);
247 		data >>= (8 - len) * 8;
248 		*val = (u32) data;
249 	} else
250 		*val = 0xffffffff;
251 	return rc;
252 }
253 
254 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
255 {
256 	u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
257 	u64 data = val;
258 	int rc;
259 
260 	data <<= (8 - len) * 8;
261 	data = (__force u64) cpu_to_le64(data);
262 	rc = zpci_store(data, req, offset);
263 	return rc;
264 }
265 
266 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
267 				       resource_size_t size,
268 				       resource_size_t align)
269 {
270 	return 0;
271 }
272 
273 /* combine single writes by using store-block insn */
274 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
275 {
276        zpci_memcpy_toio(to, from, count);
277 }
278 
279 /* Create a virtual mapping cookie for a PCI BAR */
280 void __iomem *pci_iomap_range(struct pci_dev *pdev,
281 			      int bar,
282 			      unsigned long offset,
283 			      unsigned long max)
284 {
285 	struct zpci_dev *zdev =	to_zpci(pdev);
286 	int idx;
287 
288 	if (!pci_resource_len(pdev, bar))
289 		return NULL;
290 
291 	idx = zdev->bars[bar].map_idx;
292 	spin_lock(&zpci_iomap_lock);
293 	/* Detect overrun */
294 	WARN_ON(!++zpci_iomap_start[idx].count);
295 	zpci_iomap_start[idx].fh = zdev->fh;
296 	zpci_iomap_start[idx].bar = bar;
297 	spin_unlock(&zpci_iomap_lock);
298 
299 	return (void __iomem *) ZPCI_ADDR(idx) + offset;
300 }
301 EXPORT_SYMBOL(pci_iomap_range);
302 
303 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
304 {
305 	return pci_iomap_range(dev, bar, 0, maxlen);
306 }
307 EXPORT_SYMBOL(pci_iomap);
308 
309 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
310 {
311 	unsigned int idx = ZPCI_IDX(addr);
312 
313 	spin_lock(&zpci_iomap_lock);
314 	/* Detect underrun */
315 	WARN_ON(!zpci_iomap_start[idx].count);
316 	if (!--zpci_iomap_start[idx].count) {
317 		zpci_iomap_start[idx].fh = 0;
318 		zpci_iomap_start[idx].bar = 0;
319 	}
320 	spin_unlock(&zpci_iomap_lock);
321 }
322 EXPORT_SYMBOL(pci_iounmap);
323 
324 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
325 		    int size, u32 *val)
326 {
327 	struct zpci_dev *zdev = get_zdev_by_bus(bus);
328 	int ret;
329 
330 	if (!zdev || devfn != ZPCI_DEVFN)
331 		ret = -ENODEV;
332 	else
333 		ret = zpci_cfg_load(zdev, where, val, size);
334 
335 	return ret;
336 }
337 
338 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
339 		     int size, u32 val)
340 {
341 	struct zpci_dev *zdev = get_zdev_by_bus(bus);
342 	int ret;
343 
344 	if (!zdev || devfn != ZPCI_DEVFN)
345 		ret = -ENODEV;
346 	else
347 		ret = zpci_cfg_store(zdev, where, val, size);
348 
349 	return ret;
350 }
351 
352 static struct pci_ops pci_root_ops = {
353 	.read = pci_read,
354 	.write = pci_write,
355 };
356 
357 static void zpci_irq_handler(struct airq_struct *airq)
358 {
359 	unsigned long si, ai;
360 	struct airq_iv *aibv;
361 	int irqs_on = 0;
362 
363 	inc_irq_stat(IRQIO_PCI);
364 	for (si = 0;;) {
365 		/* Scan adapter summary indicator bit vector */
366 		si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
367 		if (si == -1UL) {
368 			if (irqs_on++)
369 				/* End of second scan with interrupts on. */
370 				break;
371 			/* First scan complete, reenable interrupts. */
372 			if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC))
373 				break;
374 			si = 0;
375 			continue;
376 		}
377 
378 		/* Scan the adapter interrupt vector for this device. */
379 		aibv = zpci_aibv[si];
380 		for (ai = 0;;) {
381 			ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
382 			if (ai == -1UL)
383 				break;
384 			inc_irq_stat(IRQIO_MSI);
385 			airq_iv_lock(aibv, ai);
386 			generic_handle_irq(airq_iv_get_data(aibv, ai));
387 			airq_iv_unlock(aibv, ai);
388 		}
389 	}
390 }
391 
392 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
393 {
394 	struct zpci_dev *zdev = to_zpci(pdev);
395 	unsigned int hwirq, msi_vecs;
396 	unsigned long aisb;
397 	struct msi_desc *msi;
398 	struct msi_msg msg;
399 	int rc, irq;
400 
401 	zdev->aisb = -1UL;
402 	if (type == PCI_CAP_ID_MSI && nvec > 1)
403 		return 1;
404 	msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
405 
406 	/* Allocate adapter summary indicator bit */
407 	aisb = airq_iv_alloc_bit(zpci_aisb_iv);
408 	if (aisb == -1UL)
409 		return -EIO;
410 	zdev->aisb = aisb;
411 
412 	/* Create adapter interrupt vector */
413 	zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
414 	if (!zdev->aibv)
415 		return -ENOMEM;
416 
417 	/* Wire up shortcut pointer */
418 	zpci_aibv[aisb] = zdev->aibv;
419 
420 	/* Request MSI interrupts */
421 	hwirq = 0;
422 	for_each_pci_msi_entry(msi, pdev) {
423 		rc = -EIO;
424 		irq = irq_alloc_desc(0);	/* Alloc irq on node 0 */
425 		if (irq < 0)
426 			return -ENOMEM;
427 		rc = irq_set_msi_desc(irq, msi);
428 		if (rc)
429 			return rc;
430 		irq_set_chip_and_handler(irq, &zpci_irq_chip,
431 					 handle_simple_irq);
432 		msg.data = hwirq;
433 		msg.address_lo = zdev->msi_addr & 0xffffffff;
434 		msg.address_hi = zdev->msi_addr >> 32;
435 		pci_write_msi_msg(irq, &msg);
436 		airq_iv_set_data(zdev->aibv, hwirq, irq);
437 		hwirq++;
438 	}
439 
440 	/* Enable adapter interrupts */
441 	rc = zpci_set_airq(zdev);
442 	if (rc)
443 		return rc;
444 
445 	return (msi_vecs == nvec) ? 0 : msi_vecs;
446 }
447 
448 void arch_teardown_msi_irqs(struct pci_dev *pdev)
449 {
450 	struct zpci_dev *zdev = to_zpci(pdev);
451 	struct msi_desc *msi;
452 	int rc;
453 
454 	/* Disable adapter interrupts */
455 	rc = zpci_clear_airq(zdev);
456 	if (rc)
457 		return;
458 
459 	/* Release MSI interrupts */
460 	for_each_pci_msi_entry(msi, pdev) {
461 		if (!msi->irq)
462 			continue;
463 		if (msi->msi_attrib.is_msix)
464 			__pci_msix_desc_mask_irq(msi, 1);
465 		else
466 			__pci_msi_desc_mask_irq(msi, 1, 1);
467 		irq_set_msi_desc(msi->irq, NULL);
468 		irq_free_desc(msi->irq);
469 		msi->msg.address_lo = 0;
470 		msi->msg.address_hi = 0;
471 		msi->msg.data = 0;
472 		msi->irq = 0;
473 	}
474 
475 	if (zdev->aisb != -1UL) {
476 		zpci_aibv[zdev->aisb] = NULL;
477 		airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
478 		zdev->aisb = -1UL;
479 	}
480 	if (zdev->aibv) {
481 		airq_iv_release(zdev->aibv);
482 		zdev->aibv = NULL;
483 	}
484 }
485 
486 static void zpci_map_resources(struct pci_dev *pdev)
487 {
488 	resource_size_t len;
489 	int i;
490 
491 	for (i = 0; i < PCI_BAR_COUNT; i++) {
492 		len = pci_resource_len(pdev, i);
493 		if (!len)
494 			continue;
495 		pdev->resource[i].start =
496 			(resource_size_t __force) pci_iomap(pdev, i, 0);
497 		pdev->resource[i].end = pdev->resource[i].start + len - 1;
498 	}
499 }
500 
501 static void zpci_unmap_resources(struct pci_dev *pdev)
502 {
503 	resource_size_t len;
504 	int i;
505 
506 	for (i = 0; i < PCI_BAR_COUNT; i++) {
507 		len = pci_resource_len(pdev, i);
508 		if (!len)
509 			continue;
510 		pci_iounmap(pdev, (void __iomem __force *)
511 			    pdev->resource[i].start);
512 	}
513 }
514 
515 static struct airq_struct zpci_airq = {
516 	.handler = zpci_irq_handler,
517 	.isc = PCI_ISC,
518 };
519 
520 static int __init zpci_irq_init(void)
521 {
522 	int rc;
523 
524 	rc = register_adapter_interrupt(&zpci_airq);
525 	if (rc)
526 		goto out;
527 	/* Set summary to 1 to be called every time for the ISC. */
528 	*zpci_airq.lsi_ptr = 1;
529 
530 	rc = -ENOMEM;
531 	zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
532 	if (!zpci_aisb_iv)
533 		goto out_airq;
534 
535 	zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
536 	return 0;
537 
538 out_airq:
539 	unregister_adapter_interrupt(&zpci_airq);
540 out:
541 	return rc;
542 }
543 
544 static void zpci_irq_exit(void)
545 {
546 	airq_iv_release(zpci_aisb_iv);
547 	unregister_adapter_interrupt(&zpci_airq);
548 }
549 
550 static int zpci_alloc_iomap(struct zpci_dev *zdev)
551 {
552 	unsigned long entry;
553 
554 	spin_lock(&zpci_iomap_lock);
555 	entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
556 	if (entry == ZPCI_IOMAP_ENTRIES) {
557 		spin_unlock(&zpci_iomap_lock);
558 		return -ENOSPC;
559 	}
560 	set_bit(entry, zpci_iomap_bitmap);
561 	spin_unlock(&zpci_iomap_lock);
562 	return entry;
563 }
564 
565 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
566 {
567 	spin_lock(&zpci_iomap_lock);
568 	memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
569 	clear_bit(entry, zpci_iomap_bitmap);
570 	spin_unlock(&zpci_iomap_lock);
571 }
572 
573 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
574 				    unsigned long size, unsigned long flags)
575 {
576 	struct resource *r;
577 
578 	r = kzalloc(sizeof(*r), GFP_KERNEL);
579 	if (!r)
580 		return NULL;
581 
582 	r->start = start;
583 	r->end = r->start + size - 1;
584 	r->flags = flags;
585 	r->name = zdev->res_name;
586 
587 	if (request_resource(&iomem_resource, r)) {
588 		kfree(r);
589 		return NULL;
590 	}
591 	return r;
592 }
593 
594 static int zpci_setup_bus_resources(struct zpci_dev *zdev,
595 				    struct list_head *resources)
596 {
597 	unsigned long addr, size, flags;
598 	struct resource *res;
599 	int i, entry;
600 
601 	snprintf(zdev->res_name, sizeof(zdev->res_name),
602 		 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
603 
604 	for (i = 0; i < PCI_BAR_COUNT; i++) {
605 		if (!zdev->bars[i].size)
606 			continue;
607 		entry = zpci_alloc_iomap(zdev);
608 		if (entry < 0)
609 			return entry;
610 		zdev->bars[i].map_idx = entry;
611 
612 		/* only MMIO is supported */
613 		flags = IORESOURCE_MEM;
614 		if (zdev->bars[i].val & 8)
615 			flags |= IORESOURCE_PREFETCH;
616 		if (zdev->bars[i].val & 4)
617 			flags |= IORESOURCE_MEM_64;
618 
619 		addr = ZPCI_ADDR(entry);
620 		size = 1UL << zdev->bars[i].size;
621 
622 		res = __alloc_res(zdev, addr, size, flags);
623 		if (!res) {
624 			zpci_free_iomap(zdev, entry);
625 			return -ENOMEM;
626 		}
627 		zdev->bars[i].res = res;
628 		pci_add_resource(resources, res);
629 	}
630 
631 	return 0;
632 }
633 
634 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
635 {
636 	int i;
637 
638 	for (i = 0; i < PCI_BAR_COUNT; i++) {
639 		if (!zdev->bars[i].size || !zdev->bars[i].res)
640 			continue;
641 
642 		zpci_free_iomap(zdev, zdev->bars[i].map_idx);
643 		release_resource(zdev->bars[i].res);
644 		kfree(zdev->bars[i].res);
645 	}
646 }
647 
648 int pcibios_add_device(struct pci_dev *pdev)
649 {
650 	struct resource *res;
651 	int i;
652 
653 	pdev->dev.groups = zpci_attr_groups;
654 	pdev->dev.dma_ops = &s390_pci_dma_ops;
655 	zpci_map_resources(pdev);
656 
657 	for (i = 0; i < PCI_BAR_COUNT; i++) {
658 		res = &pdev->resource[i];
659 		if (res->parent || !res->flags)
660 			continue;
661 		pci_claim_resource(pdev, i);
662 	}
663 
664 	return 0;
665 }
666 
667 void pcibios_release_device(struct pci_dev *pdev)
668 {
669 	zpci_unmap_resources(pdev);
670 }
671 
672 int pcibios_enable_device(struct pci_dev *pdev, int mask)
673 {
674 	struct zpci_dev *zdev = to_zpci(pdev);
675 
676 	zpci_debug_init_device(zdev, dev_name(&pdev->dev));
677 	zpci_fmb_enable_device(zdev);
678 
679 	return pci_enable_resources(pdev, mask);
680 }
681 
682 void pcibios_disable_device(struct pci_dev *pdev)
683 {
684 	struct zpci_dev *zdev = to_zpci(pdev);
685 
686 	zpci_fmb_disable_device(zdev);
687 	zpci_debug_exit_device(zdev);
688 }
689 
690 #ifdef CONFIG_HIBERNATE_CALLBACKS
691 static int zpci_restore(struct device *dev)
692 {
693 	struct pci_dev *pdev = to_pci_dev(dev);
694 	struct zpci_dev *zdev = to_zpci(pdev);
695 	int ret = 0;
696 
697 	if (zdev->state != ZPCI_FN_STATE_ONLINE)
698 		goto out;
699 
700 	ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
701 	if (ret)
702 		goto out;
703 
704 	zpci_map_resources(pdev);
705 	zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
706 			   (u64) zdev->dma_table);
707 
708 out:
709 	return ret;
710 }
711 
712 static int zpci_freeze(struct device *dev)
713 {
714 	struct pci_dev *pdev = to_pci_dev(dev);
715 	struct zpci_dev *zdev = to_zpci(pdev);
716 
717 	if (zdev->state != ZPCI_FN_STATE_ONLINE)
718 		return 0;
719 
720 	zpci_unregister_ioat(zdev, 0);
721 	zpci_unmap_resources(pdev);
722 	return clp_disable_fh(zdev);
723 }
724 
725 struct dev_pm_ops pcibios_pm_ops = {
726 	.thaw_noirq = zpci_restore,
727 	.freeze_noirq = zpci_freeze,
728 	.restore_noirq = zpci_restore,
729 	.poweroff_noirq = zpci_freeze,
730 };
731 #endif /* CONFIG_HIBERNATE_CALLBACKS */
732 
733 static int zpci_alloc_domain(struct zpci_dev *zdev)
734 {
735 	if (zpci_unique_uid) {
736 		zdev->domain = (u16) zdev->uid;
737 		if (zdev->domain >= ZPCI_NR_DEVICES)
738 			return 0;
739 
740 		spin_lock(&zpci_domain_lock);
741 		if (test_bit(zdev->domain, zpci_domain)) {
742 			spin_unlock(&zpci_domain_lock);
743 			return -EEXIST;
744 		}
745 		set_bit(zdev->domain, zpci_domain);
746 		spin_unlock(&zpci_domain_lock);
747 		return 0;
748 	}
749 
750 	spin_lock(&zpci_domain_lock);
751 	zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
752 	if (zdev->domain == ZPCI_NR_DEVICES) {
753 		spin_unlock(&zpci_domain_lock);
754 		return -ENOSPC;
755 	}
756 	set_bit(zdev->domain, zpci_domain);
757 	spin_unlock(&zpci_domain_lock);
758 	return 0;
759 }
760 
761 static void zpci_free_domain(struct zpci_dev *zdev)
762 {
763 	if (zdev->domain >= ZPCI_NR_DEVICES)
764 		return;
765 
766 	spin_lock(&zpci_domain_lock);
767 	clear_bit(zdev->domain, zpci_domain);
768 	spin_unlock(&zpci_domain_lock);
769 }
770 
771 void pcibios_remove_bus(struct pci_bus *bus)
772 {
773 	struct zpci_dev *zdev = get_zdev_by_bus(bus);
774 
775 	zpci_exit_slot(zdev);
776 	zpci_cleanup_bus_resources(zdev);
777 	zpci_destroy_iommu(zdev);
778 	zpci_free_domain(zdev);
779 
780 	spin_lock(&zpci_list_lock);
781 	list_del(&zdev->entry);
782 	spin_unlock(&zpci_list_lock);
783 
784 	zpci_dbg(3, "rem fid:%x\n", zdev->fid);
785 	kfree(zdev);
786 }
787 
788 static int zpci_scan_bus(struct zpci_dev *zdev)
789 {
790 	LIST_HEAD(resources);
791 	int ret;
792 
793 	ret = zpci_setup_bus_resources(zdev, &resources);
794 	if (ret)
795 		goto error;
796 
797 	zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
798 				      zdev, &resources);
799 	if (!zdev->bus) {
800 		ret = -EIO;
801 		goto error;
802 	}
803 	zdev->bus->max_bus_speed = zdev->max_bus_speed;
804 	pci_bus_add_devices(zdev->bus);
805 	return 0;
806 
807 error:
808 	zpci_cleanup_bus_resources(zdev);
809 	pci_free_resource_list(&resources);
810 	return ret;
811 }
812 
813 int zpci_enable_device(struct zpci_dev *zdev)
814 {
815 	int rc;
816 
817 	rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
818 	if (rc)
819 		goto out;
820 
821 	rc = zpci_dma_init_device(zdev);
822 	if (rc)
823 		goto out_dma;
824 
825 	zdev->state = ZPCI_FN_STATE_ONLINE;
826 	return 0;
827 
828 out_dma:
829 	clp_disable_fh(zdev);
830 out:
831 	return rc;
832 }
833 EXPORT_SYMBOL_GPL(zpci_enable_device);
834 
835 int zpci_disable_device(struct zpci_dev *zdev)
836 {
837 	zpci_dma_exit_device(zdev);
838 	return clp_disable_fh(zdev);
839 }
840 EXPORT_SYMBOL_GPL(zpci_disable_device);
841 
842 int zpci_create_device(struct zpci_dev *zdev)
843 {
844 	int rc;
845 
846 	rc = zpci_alloc_domain(zdev);
847 	if (rc)
848 		goto out;
849 
850 	rc = zpci_init_iommu(zdev);
851 	if (rc)
852 		goto out_free;
853 
854 	mutex_init(&zdev->lock);
855 	if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
856 		rc = zpci_enable_device(zdev);
857 		if (rc)
858 			goto out_destroy_iommu;
859 	}
860 	rc = zpci_scan_bus(zdev);
861 	if (rc)
862 		goto out_disable;
863 
864 	spin_lock(&zpci_list_lock);
865 	list_add_tail(&zdev->entry, &zpci_list);
866 	spin_unlock(&zpci_list_lock);
867 
868 	zpci_init_slot(zdev);
869 
870 	return 0;
871 
872 out_disable:
873 	if (zdev->state == ZPCI_FN_STATE_ONLINE)
874 		zpci_disable_device(zdev);
875 out_destroy_iommu:
876 	zpci_destroy_iommu(zdev);
877 out_free:
878 	zpci_free_domain(zdev);
879 out:
880 	return rc;
881 }
882 
883 void zpci_remove_device(struct zpci_dev *zdev)
884 {
885 	if (!zdev->bus)
886 		return;
887 
888 	pci_stop_root_bus(zdev->bus);
889 	pci_remove_root_bus(zdev->bus);
890 }
891 
892 int zpci_report_error(struct pci_dev *pdev,
893 		      struct zpci_report_error_header *report)
894 {
895 	struct zpci_dev *zdev = to_zpci(pdev);
896 
897 	return sclp_pci_report(report, zdev->fh, zdev->fid);
898 }
899 EXPORT_SYMBOL(zpci_report_error);
900 
901 static int zpci_mem_init(void)
902 {
903 	BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
904 		     __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
905 
906 	zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
907 					   __alignof__(struct zpci_fmb), 0, NULL);
908 	if (!zdev_fmb_cache)
909 		goto error_fmb;
910 
911 	zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
912 				   sizeof(*zpci_iomap_start), GFP_KERNEL);
913 	if (!zpci_iomap_start)
914 		goto error_iomap;
915 
916 	zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
917 				    sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
918 	if (!zpci_iomap_bitmap)
919 		goto error_iomap_bitmap;
920 
921 	return 0;
922 error_iomap_bitmap:
923 	kfree(zpci_iomap_start);
924 error_iomap:
925 	kmem_cache_destroy(zdev_fmb_cache);
926 error_fmb:
927 	return -ENOMEM;
928 }
929 
930 static void zpci_mem_exit(void)
931 {
932 	kfree(zpci_iomap_bitmap);
933 	kfree(zpci_iomap_start);
934 	kmem_cache_destroy(zdev_fmb_cache);
935 }
936 
937 static unsigned int s390_pci_probe = 1;
938 static unsigned int s390_pci_initialized;
939 
940 char * __init pcibios_setup(char *str)
941 {
942 	if (!strcmp(str, "off")) {
943 		s390_pci_probe = 0;
944 		return NULL;
945 	}
946 	return str;
947 }
948 
949 bool zpci_is_enabled(void)
950 {
951 	return s390_pci_initialized;
952 }
953 
954 static int __init pci_base_init(void)
955 {
956 	int rc;
957 
958 	if (!s390_pci_probe)
959 		return 0;
960 
961 	if (!test_facility(69) || !test_facility(71))
962 		return 0;
963 
964 	rc = zpci_debug_init();
965 	if (rc)
966 		goto out;
967 
968 	rc = zpci_mem_init();
969 	if (rc)
970 		goto out_mem;
971 
972 	rc = zpci_irq_init();
973 	if (rc)
974 		goto out_irq;
975 
976 	rc = zpci_dma_init();
977 	if (rc)
978 		goto out_dma;
979 
980 	rc = clp_scan_pci_devices();
981 	if (rc)
982 		goto out_find;
983 
984 	s390_pci_initialized = 1;
985 	return 0;
986 
987 out_find:
988 	zpci_dma_exit();
989 out_dma:
990 	zpci_irq_exit();
991 out_irq:
992 	zpci_mem_exit();
993 out_mem:
994 	zpci_debug_exit();
995 out:
996 	return rc;
997 }
998 subsys_initcall_sync(pci_base_init);
999 
1000 void zpci_rescan(void)
1001 {
1002 	if (zpci_is_enabled())
1003 		clp_rescan_pci_devices_simple();
1004 }
1005