xref: /openbmc/linux/arch/s390/pci/pci.c (revision 9d749629)
1 /*
2  * Copyright IBM Corp. 2012
3  *
4  * Author(s):
5  *   Jan Glauber <jang@linux.vnet.ibm.com>
6  *
7  * The System z PCI code is a rewrite from a prototype by
8  * the following people (Kudoz!):
9  *   Alexander Schmidt
10  *   Christoph Raisch
11  *   Hannes Hering
12  *   Hoang-Nam Nguyen
13  *   Jan-Bernd Themann
14  *   Stefan Roscher
15  *   Thomas Klein
16  */
17 
18 #define COMPONENT "zPCI"
19 #define pr_fmt(fmt) COMPONENT ": " fmt
20 
21 #include <linux/kernel.h>
22 #include <linux/slab.h>
23 #include <linux/err.h>
24 #include <linux/export.h>
25 #include <linux/delay.h>
26 #include <linux/irq.h>
27 #include <linux/kernel_stat.h>
28 #include <linux/seq_file.h>
29 #include <linux/pci.h>
30 #include <linux/msi.h>
31 
32 #include <asm/isc.h>
33 #include <asm/airq.h>
34 #include <asm/facility.h>
35 #include <asm/pci_insn.h>
36 #include <asm/pci_clp.h>
37 #include <asm/pci_dma.h>
38 
39 #define DEBUG				/* enable pr_debug */
40 
41 #define	SIC_IRQ_MODE_ALL		0
42 #define	SIC_IRQ_MODE_SINGLE		1
43 
44 #define ZPCI_NR_DMA_SPACES		1
45 #define ZPCI_MSI_VEC_BITS		6
46 #define ZPCI_NR_DEVICES			CONFIG_PCI_NR_FUNCTIONS
47 
48 /* list of all detected zpci devices */
49 LIST_HEAD(zpci_list);
50 EXPORT_SYMBOL_GPL(zpci_list);
51 DEFINE_MUTEX(zpci_list_lock);
52 EXPORT_SYMBOL_GPL(zpci_list_lock);
53 
54 struct pci_hp_callback_ops hotplug_ops;
55 EXPORT_SYMBOL_GPL(hotplug_ops);
56 
57 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
58 static DEFINE_SPINLOCK(zpci_domain_lock);
59 
60 struct callback {
61 	irq_handler_t	handler;
62 	void		*data;
63 };
64 
65 struct zdev_irq_map {
66 	unsigned long	aibv;		/* AI bit vector */
67 	int		msi_vecs;	/* consecutive MSI-vectors used */
68 	int		__unused;
69 	struct callback	cb[ZPCI_NR_MSI_VECS]; /* callback handler array */
70 	spinlock_t	lock;		/* protect callbacks against de-reg */
71 };
72 
73 struct intr_bucket {
74 	/* amap of adapters, one bit per dev, corresponds to one irq nr */
75 	unsigned long	*alloc;
76 	/* AI summary bit, global page for all devices */
77 	unsigned long	*aisb;
78 	/* pointer to aibv and callback data in zdev */
79 	struct zdev_irq_map *imap[ZPCI_NR_DEVICES];
80 	/* protects the whole bucket struct */
81 	spinlock_t	lock;
82 };
83 
84 static struct intr_bucket *bucket;
85 
86 /* Adapter local summary indicator */
87 static u8 *zpci_irq_si;
88 
89 static atomic_t irq_retries = ATOMIC_INIT(0);
90 
91 /* I/O Map */
92 static DEFINE_SPINLOCK(zpci_iomap_lock);
93 static DECLARE_BITMAP(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
94 struct zpci_iomap_entry *zpci_iomap_start;
95 EXPORT_SYMBOL_GPL(zpci_iomap_start);
96 
97 /* highest irq summary bit */
98 static int __read_mostly aisb_max;
99 
100 static struct kmem_cache *zdev_irq_cache;
101 static struct kmem_cache *zdev_fmb_cache;
102 
103 debug_info_t *pci_debug_msg_id;
104 debug_info_t *pci_debug_err_id;
105 
106 static inline int irq_to_msi_nr(unsigned int irq)
107 {
108 	return irq & ZPCI_MSI_MASK;
109 }
110 
111 static inline int irq_to_dev_nr(unsigned int irq)
112 {
113 	return irq >> ZPCI_MSI_VEC_BITS;
114 }
115 
116 static inline struct zdev_irq_map *get_imap(unsigned int irq)
117 {
118 	return bucket->imap[irq_to_dev_nr(irq)];
119 }
120 
121 struct zpci_dev *get_zdev(struct pci_dev *pdev)
122 {
123 	return (struct zpci_dev *) pdev->sysdata;
124 }
125 
126 struct zpci_dev *get_zdev_by_fid(u32 fid)
127 {
128 	struct zpci_dev *tmp, *zdev = NULL;
129 
130 	mutex_lock(&zpci_list_lock);
131 	list_for_each_entry(tmp, &zpci_list, entry) {
132 		if (tmp->fid == fid) {
133 			zdev = tmp;
134 			break;
135 		}
136 	}
137 	mutex_unlock(&zpci_list_lock);
138 	return zdev;
139 }
140 
141 bool zpci_fid_present(u32 fid)
142 {
143 	return (get_zdev_by_fid(fid) != NULL) ? true : false;
144 }
145 
146 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
147 {
148 	return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
149 }
150 
151 int pci_domain_nr(struct pci_bus *bus)
152 {
153 	return ((struct zpci_dev *) bus->sysdata)->domain;
154 }
155 EXPORT_SYMBOL_GPL(pci_domain_nr);
156 
157 int pci_proc_domain(struct pci_bus *bus)
158 {
159 	return pci_domain_nr(bus);
160 }
161 EXPORT_SYMBOL_GPL(pci_proc_domain);
162 
163 /* Modify PCI: Register adapter interruptions */
164 static int zpci_register_airq(struct zpci_dev *zdev, unsigned int aisb,
165 			      u64 aibv)
166 {
167 	u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
168 	struct zpci_fib *fib;
169 	int rc;
170 
171 	fib = (void *) get_zeroed_page(GFP_KERNEL);
172 	if (!fib)
173 		return -ENOMEM;
174 
175 	fib->isc = PCI_ISC;
176 	fib->noi = zdev->irq_map->msi_vecs;
177 	fib->sum = 1;		/* enable summary notifications */
178 	fib->aibv = aibv;
179 	fib->aibvo = 0;		/* every function has its own page */
180 	fib->aisb = (u64) bucket->aisb + aisb / 8;
181 	fib->aisbo = aisb & ZPCI_MSI_MASK;
182 
183 	rc = mpcifc_instr(req, fib);
184 	pr_debug("%s mpcifc returned noi: %d\n", __func__, fib->noi);
185 
186 	free_page((unsigned long) fib);
187 	return rc;
188 }
189 
190 struct mod_pci_args {
191 	u64 base;
192 	u64 limit;
193 	u64 iota;
194 	u64 fmb_addr;
195 };
196 
197 static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
198 {
199 	u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
200 	struct zpci_fib *fib;
201 	int rc;
202 
203 	/* The FIB must be available even if it's not used */
204 	fib = (void *) get_zeroed_page(GFP_KERNEL);
205 	if (!fib)
206 		return -ENOMEM;
207 
208 	fib->pba = args->base;
209 	fib->pal = args->limit;
210 	fib->iota = args->iota;
211 	fib->fmb_addr = args->fmb_addr;
212 
213 	rc = mpcifc_instr(req, fib);
214 	free_page((unsigned long) fib);
215 	return rc;
216 }
217 
218 /* Modify PCI: Register I/O address translation parameters */
219 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
220 		       u64 base, u64 limit, u64 iota)
221 {
222 	struct mod_pci_args args = { base, limit, iota, 0 };
223 
224 	WARN_ON_ONCE(iota & 0x3fff);
225 	args.iota |= ZPCI_IOTA_RTTO_FLAG;
226 	return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
227 }
228 
229 /* Modify PCI: Unregister I/O address translation parameters */
230 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
231 {
232 	struct mod_pci_args args = { 0, 0, 0, 0 };
233 
234 	return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
235 }
236 
237 /* Modify PCI: Unregister adapter interruptions */
238 static int zpci_unregister_airq(struct zpci_dev *zdev)
239 {
240 	struct mod_pci_args args = { 0, 0, 0, 0 };
241 
242 	return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args);
243 }
244 
245 /* Modify PCI: Set PCI function measurement parameters */
246 int zpci_fmb_enable_device(struct zpci_dev *zdev)
247 {
248 	struct mod_pci_args args = { 0, 0, 0, 0 };
249 
250 	if (zdev->fmb)
251 		return -EINVAL;
252 
253 	zdev->fmb = kmem_cache_alloc(zdev_fmb_cache, GFP_KERNEL);
254 	if (!zdev->fmb)
255 		return -ENOMEM;
256 	memset(zdev->fmb, 0, sizeof(*zdev->fmb));
257 	WARN_ON((u64) zdev->fmb & 0xf);
258 
259 	args.fmb_addr = virt_to_phys(zdev->fmb);
260 	return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
261 }
262 
263 /* Modify PCI: Disable PCI function measurement */
264 int zpci_fmb_disable_device(struct zpci_dev *zdev)
265 {
266 	struct mod_pci_args args = { 0, 0, 0, 0 };
267 	int rc;
268 
269 	if (!zdev->fmb)
270 		return -EINVAL;
271 
272 	/* Function measurement is disabled if fmb address is zero */
273 	rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
274 
275 	kmem_cache_free(zdev_fmb_cache, zdev->fmb);
276 	zdev->fmb = NULL;
277 	return rc;
278 }
279 
280 #define ZPCI_PCIAS_CFGSPC	15
281 
282 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
283 {
284 	u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
285 	u64 data;
286 	int rc;
287 
288 	rc = pcilg_instr(&data, req, offset);
289 	data = data << ((8 - len) * 8);
290 	data = le64_to_cpu(data);
291 	if (!rc)
292 		*val = (u32) data;
293 	else
294 		*val = 0xffffffff;
295 	return rc;
296 }
297 
298 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
299 {
300 	u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
301 	u64 data = val;
302 	int rc;
303 
304 	data = cpu_to_le64(data);
305 	data = data >> ((8 - len) * 8);
306 	rc = pcistg_instr(data, req, offset);
307 	return rc;
308 }
309 
310 void synchronize_irq(unsigned int irq)
311 {
312 	/*
313 	 * Not needed, the handler is protected by a lock and IRQs that occur
314 	 * after the handler is deleted are just NOPs.
315 	 */
316 }
317 EXPORT_SYMBOL_GPL(synchronize_irq);
318 
319 void enable_irq(unsigned int irq)
320 {
321 	struct msi_desc *msi = irq_get_msi_desc(irq);
322 
323 	zpci_msi_set_mask_bits(msi, 1, 0);
324 }
325 EXPORT_SYMBOL_GPL(enable_irq);
326 
327 void disable_irq(unsigned int irq)
328 {
329 	struct msi_desc *msi = irq_get_msi_desc(irq);
330 
331 	zpci_msi_set_mask_bits(msi, 1, 1);
332 }
333 EXPORT_SYMBOL_GPL(disable_irq);
334 
335 void disable_irq_nosync(unsigned int irq)
336 {
337 	disable_irq(irq);
338 }
339 EXPORT_SYMBOL_GPL(disable_irq_nosync);
340 
341 unsigned long probe_irq_on(void)
342 {
343 	return 0;
344 }
345 EXPORT_SYMBOL_GPL(probe_irq_on);
346 
347 int probe_irq_off(unsigned long val)
348 {
349 	return 0;
350 }
351 EXPORT_SYMBOL_GPL(probe_irq_off);
352 
353 unsigned int probe_irq_mask(unsigned long val)
354 {
355 	return val;
356 }
357 EXPORT_SYMBOL_GPL(probe_irq_mask);
358 
359 void pcibios_fixup_bus(struct pci_bus *bus)
360 {
361 }
362 
363 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
364 				       resource_size_t size,
365 				       resource_size_t align)
366 {
367 	return 0;
368 }
369 
370 /* combine single writes by using store-block insn */
371 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
372 {
373        zpci_memcpy_toio(to, from, count);
374 }
375 
376 /* Create a virtual mapping cookie for a PCI BAR */
377 void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max)
378 {
379 	struct zpci_dev *zdev =	get_zdev(pdev);
380 	u64 addr;
381 	int idx;
382 
383 	if ((bar & 7) != bar)
384 		return NULL;
385 
386 	idx = zdev->bars[bar].map_idx;
387 	spin_lock(&zpci_iomap_lock);
388 	zpci_iomap_start[idx].fh = zdev->fh;
389 	zpci_iomap_start[idx].bar = bar;
390 	spin_unlock(&zpci_iomap_lock);
391 
392 	addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48);
393 	return (void __iomem *) addr;
394 }
395 EXPORT_SYMBOL_GPL(pci_iomap);
396 
397 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
398 {
399 	unsigned int idx;
400 
401 	idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48;
402 	spin_lock(&zpci_iomap_lock);
403 	zpci_iomap_start[idx].fh = 0;
404 	zpci_iomap_start[idx].bar = 0;
405 	spin_unlock(&zpci_iomap_lock);
406 }
407 EXPORT_SYMBOL_GPL(pci_iounmap);
408 
409 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
410 		    int size, u32 *val)
411 {
412 	struct zpci_dev *zdev = get_zdev_by_bus(bus);
413 
414 	if (!zdev || devfn != ZPCI_DEVFN)
415 		return 0;
416 	return zpci_cfg_load(zdev, where, val, size);
417 }
418 
419 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
420 		     int size, u32 val)
421 {
422 	struct zpci_dev *zdev = get_zdev_by_bus(bus);
423 
424 	if (!zdev || devfn != ZPCI_DEVFN)
425 		return 0;
426 	return zpci_cfg_store(zdev, where, val, size);
427 }
428 
429 static struct pci_ops pci_root_ops = {
430 	.read = pci_read,
431 	.write = pci_write,
432 };
433 
434 /* store the last handled bit to implement fair scheduling of devices */
435 static DEFINE_PER_CPU(unsigned long, next_sbit);
436 
437 static void zpci_irq_handler(void *dont, void *need)
438 {
439 	unsigned long sbit, mbit, last = 0, start = __get_cpu_var(next_sbit);
440 	int rescan = 0, max = aisb_max;
441 	struct zdev_irq_map *imap;
442 
443 	inc_irq_stat(IRQIO_PCI);
444 	sbit = start;
445 
446 scan:
447 	/* find summary_bit */
448 	for_each_set_bit_left_cont(sbit, bucket->aisb, max) {
449 		clear_bit(63 - (sbit & 63), bucket->aisb + (sbit >> 6));
450 		last = sbit;
451 
452 		/* find vector bit */
453 		imap = bucket->imap[sbit];
454 		for_each_set_bit_left(mbit, &imap->aibv, imap->msi_vecs) {
455 			inc_irq_stat(IRQIO_MSI);
456 			clear_bit(63 - mbit, &imap->aibv);
457 
458 			spin_lock(&imap->lock);
459 			if (imap->cb[mbit].handler)
460 				imap->cb[mbit].handler(mbit,
461 					imap->cb[mbit].data);
462 			spin_unlock(&imap->lock);
463 		}
464 	}
465 
466 	if (rescan)
467 		goto out;
468 
469 	/* scan the skipped bits */
470 	if (start > 0) {
471 		sbit = 0;
472 		max = start;
473 		start = 0;
474 		goto scan;
475 	}
476 
477 	/* enable interrupts again */
478 	sic_instr(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
479 
480 	/* check again to not lose initiative */
481 	rmb();
482 	max = aisb_max;
483 	sbit = find_first_bit_left(bucket->aisb, max);
484 	if (sbit != max) {
485 		atomic_inc(&irq_retries);
486 		rescan++;
487 		goto scan;
488 	}
489 out:
490 	/* store next device bit to scan */
491 	__get_cpu_var(next_sbit) = (++last >= aisb_max) ? 0 : last;
492 }
493 
494 /* msi_vecs - number of requested interrupts, 0 place function to error state */
495 static int zpci_setup_msi(struct pci_dev *pdev, int msi_vecs)
496 {
497 	struct zpci_dev *zdev = get_zdev(pdev);
498 	unsigned int aisb, msi_nr;
499 	struct msi_desc *msi;
500 	int rc;
501 
502 	/* store the number of used MSI vectors */
503 	zdev->irq_map->msi_vecs = min(msi_vecs, ZPCI_NR_MSI_VECS);
504 
505 	spin_lock(&bucket->lock);
506 	aisb = find_first_zero_bit(bucket->alloc, PAGE_SIZE);
507 	/* alloc map exhausted? */
508 	if (aisb == PAGE_SIZE) {
509 		spin_unlock(&bucket->lock);
510 		return -EIO;
511 	}
512 	set_bit(aisb, bucket->alloc);
513 	spin_unlock(&bucket->lock);
514 
515 	zdev->aisb = aisb;
516 	if (aisb + 1 > aisb_max)
517 		aisb_max = aisb + 1;
518 
519 	/* wire up IRQ shortcut pointer */
520 	bucket->imap[zdev->aisb] = zdev->irq_map;
521 	pr_debug("%s: imap[%u] linked to %p\n", __func__, zdev->aisb, zdev->irq_map);
522 
523 	/* TODO: irq number 0 wont be found if we return less than requested MSIs.
524 	 * ignore it for now and fix in common code.
525 	 */
526 	msi_nr = aisb << ZPCI_MSI_VEC_BITS;
527 
528 	list_for_each_entry(msi, &pdev->msi_list, list) {
529 		rc = zpci_setup_msi_irq(zdev, msi, msi_nr,
530 					  aisb << ZPCI_MSI_VEC_BITS);
531 		if (rc)
532 			return rc;
533 		msi_nr++;
534 	}
535 
536 	rc = zpci_register_airq(zdev, aisb, (u64) &zdev->irq_map->aibv);
537 	if (rc) {
538 		clear_bit(aisb, bucket->alloc);
539 		dev_err(&pdev->dev, "register MSI failed with: %d\n", rc);
540 		return rc;
541 	}
542 	return (zdev->irq_map->msi_vecs == msi_vecs) ?
543 		0 : zdev->irq_map->msi_vecs;
544 }
545 
546 static void zpci_teardown_msi(struct pci_dev *pdev)
547 {
548 	struct zpci_dev *zdev = get_zdev(pdev);
549 	struct msi_desc *msi;
550 	int aisb, rc;
551 
552 	rc = zpci_unregister_airq(zdev);
553 	if (rc) {
554 		dev_err(&pdev->dev, "deregister MSI failed with: %d\n", rc);
555 		return;
556 	}
557 
558 	msi = list_first_entry(&pdev->msi_list, struct msi_desc, list);
559 	aisb = irq_to_dev_nr(msi->irq);
560 
561 	list_for_each_entry(msi, &pdev->msi_list, list)
562 		zpci_teardown_msi_irq(zdev, msi);
563 
564 	clear_bit(aisb, bucket->alloc);
565 	if (aisb + 1 == aisb_max)
566 		aisb_max--;
567 }
568 
569 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
570 {
571 	pr_debug("%s: requesting %d MSI-X interrupts...", __func__, nvec);
572 	if (type != PCI_CAP_ID_MSIX && type != PCI_CAP_ID_MSI)
573 		return -EINVAL;
574 	return zpci_setup_msi(pdev, nvec);
575 }
576 
577 void arch_teardown_msi_irqs(struct pci_dev *pdev)
578 {
579 	pr_info("%s: on pdev: %p\n", __func__, pdev);
580 	zpci_teardown_msi(pdev);
581 }
582 
583 static void zpci_map_resources(struct zpci_dev *zdev)
584 {
585 	struct pci_dev *pdev = zdev->pdev;
586 	resource_size_t len;
587 	int i;
588 
589 	for (i = 0; i < PCI_BAR_COUNT; i++) {
590 		len = pci_resource_len(pdev, i);
591 		if (!len)
592 			continue;
593 		pdev->resource[i].start = (resource_size_t) pci_iomap(pdev, i, 0);
594 		pdev->resource[i].end = pdev->resource[i].start + len - 1;
595 		pr_debug("BAR%i: -> start: %Lx  end: %Lx\n",
596 			i, pdev->resource[i].start, pdev->resource[i].end);
597 	}
598 };
599 
600 static void zpci_unmap_resources(struct pci_dev *pdev)
601 {
602 	resource_size_t len;
603 	int i;
604 
605 	for (i = 0; i < PCI_BAR_COUNT; i++) {
606 		len = pci_resource_len(pdev, i);
607 		if (!len)
608 			continue;
609 		pci_iounmap(pdev, (void *) pdev->resource[i].start);
610 	}
611 };
612 
613 struct zpci_dev *zpci_alloc_device(void)
614 {
615 	struct zpci_dev *zdev;
616 
617 	/* Alloc memory for our private pci device data */
618 	zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
619 	if (!zdev)
620 		return ERR_PTR(-ENOMEM);
621 
622 	/* Alloc aibv & callback space */
623 	zdev->irq_map = kmem_cache_zalloc(zdev_irq_cache, GFP_KERNEL);
624 	if (!zdev->irq_map)
625 		goto error;
626 	WARN_ON((u64) zdev->irq_map & 0xff);
627 	return zdev;
628 
629 error:
630 	kfree(zdev);
631 	return ERR_PTR(-ENOMEM);
632 }
633 
634 void zpci_free_device(struct zpci_dev *zdev)
635 {
636 	kmem_cache_free(zdev_irq_cache, zdev->irq_map);
637 	kfree(zdev);
638 }
639 
640 /* Called on removal of pci_dev, leaves zpci and bus device */
641 static void zpci_remove_device(struct pci_dev *pdev)
642 {
643 	struct zpci_dev *zdev = get_zdev(pdev);
644 
645 	dev_info(&pdev->dev, "Removing device %u\n", zdev->domain);
646 	zdev->state = ZPCI_FN_STATE_CONFIGURED;
647 	zpci_dma_exit_device(zdev);
648 	zpci_fmb_disable_device(zdev);
649 	zpci_sysfs_remove_device(&pdev->dev);
650 	zpci_unmap_resources(pdev);
651 	list_del(&zdev->entry);		/* can be called from init */
652 	zdev->pdev = NULL;
653 }
654 
655 static void zpci_scan_devices(void)
656 {
657 	struct zpci_dev *zdev;
658 
659 	mutex_lock(&zpci_list_lock);
660 	list_for_each_entry(zdev, &zpci_list, entry)
661 		if (zdev->state == ZPCI_FN_STATE_CONFIGURED)
662 			zpci_scan_device(zdev);
663 	mutex_unlock(&zpci_list_lock);
664 }
665 
666 /*
667  * Too late for any s390 specific setup, since interrupts must be set up
668  * already which requires DMA setup too and the pci scan will access the
669  * config space, which only works if the function handle is enabled.
670  */
671 int pcibios_enable_device(struct pci_dev *pdev, int mask)
672 {
673 	struct resource *res;
674 	u16 cmd;
675 	int i;
676 
677 	pci_read_config_word(pdev, PCI_COMMAND, &cmd);
678 
679 	for (i = 0; i < PCI_BAR_COUNT; i++) {
680 		res = &pdev->resource[i];
681 
682 		if (res->flags & IORESOURCE_IO)
683 			return -EINVAL;
684 
685 		if (res->flags & IORESOURCE_MEM)
686 			cmd |= PCI_COMMAND_MEMORY;
687 	}
688 	pci_write_config_word(pdev, PCI_COMMAND, cmd);
689 	return 0;
690 }
691 
692 void pcibios_disable_device(struct pci_dev *pdev)
693 {
694 	zpci_remove_device(pdev);
695 	pdev->sysdata = NULL;
696 }
697 
698 int pcibios_add_platform_entries(struct pci_dev *pdev)
699 {
700 	return zpci_sysfs_add_device(&pdev->dev);
701 }
702 
703 int zpci_request_irq(unsigned int irq, irq_handler_t handler, void *data)
704 {
705 	int msi_nr = irq_to_msi_nr(irq);
706 	struct zdev_irq_map *imap;
707 	struct msi_desc *msi;
708 
709 	msi = irq_get_msi_desc(irq);
710 	if (!msi)
711 		return -EIO;
712 
713 	imap = get_imap(irq);
714 	spin_lock_init(&imap->lock);
715 
716 	pr_debug("%s: register handler for IRQ:MSI %d:%d\n", __func__, irq >> 6, msi_nr);
717 	imap->cb[msi_nr].handler = handler;
718 	imap->cb[msi_nr].data = data;
719 
720 	/*
721 	 * The generic MSI code returns with the interrupt disabled on the
722 	 * card, using the MSI mask bits. Firmware doesn't appear to unmask
723 	 * at that level, so we do it here by hand.
724 	 */
725 	zpci_msi_set_mask_bits(msi, 1, 0);
726 	return 0;
727 }
728 
729 void zpci_free_irq(unsigned int irq)
730 {
731 	struct zdev_irq_map *imap = get_imap(irq);
732 	int msi_nr = irq_to_msi_nr(irq);
733 	unsigned long flags;
734 
735 	pr_debug("%s: for irq: %d\n", __func__, irq);
736 
737 	spin_lock_irqsave(&imap->lock, flags);
738 	imap->cb[msi_nr].handler = NULL;
739 	imap->cb[msi_nr].data = NULL;
740 	spin_unlock_irqrestore(&imap->lock, flags);
741 }
742 
743 int request_irq(unsigned int irq, irq_handler_t handler,
744 		unsigned long irqflags, const char *devname, void *dev_id)
745 {
746 	pr_debug("%s: irq: %d  handler: %p  flags: %lx  dev: %s\n",
747 		__func__, irq, handler, irqflags, devname);
748 
749 	return zpci_request_irq(irq, handler, dev_id);
750 }
751 EXPORT_SYMBOL_GPL(request_irq);
752 
753 void free_irq(unsigned int irq, void *dev_id)
754 {
755 	zpci_free_irq(irq);
756 }
757 EXPORT_SYMBOL_GPL(free_irq);
758 
759 static int __init zpci_irq_init(void)
760 {
761 	int cpu, rc;
762 
763 	bucket = kzalloc(sizeof(*bucket), GFP_KERNEL);
764 	if (!bucket)
765 		return -ENOMEM;
766 
767 	bucket->aisb = (unsigned long *) get_zeroed_page(GFP_KERNEL);
768 	if (!bucket->aisb) {
769 		rc = -ENOMEM;
770 		goto out_aisb;
771 	}
772 
773 	bucket->alloc = (unsigned long *) get_zeroed_page(GFP_KERNEL);
774 	if (!bucket->alloc) {
775 		rc = -ENOMEM;
776 		goto out_alloc;
777 	}
778 
779 	isc_register(PCI_ISC);
780 	zpci_irq_si = s390_register_adapter_interrupt(&zpci_irq_handler, NULL, PCI_ISC);
781 	if (IS_ERR(zpci_irq_si)) {
782 		rc = PTR_ERR(zpci_irq_si);
783 		zpci_irq_si = NULL;
784 		goto out_ai;
785 	}
786 
787 	for_each_online_cpu(cpu)
788 		per_cpu(next_sbit, cpu) = 0;
789 
790 	spin_lock_init(&bucket->lock);
791 	/* set summary to 1 to be called every time for the ISC */
792 	*zpci_irq_si = 1;
793 	sic_instr(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
794 	return 0;
795 
796 out_ai:
797 	isc_unregister(PCI_ISC);
798 	free_page((unsigned long) bucket->alloc);
799 out_alloc:
800 	free_page((unsigned long) bucket->aisb);
801 out_aisb:
802 	kfree(bucket);
803 	return rc;
804 }
805 
806 static void zpci_irq_exit(void)
807 {
808 	free_page((unsigned long) bucket->alloc);
809 	free_page((unsigned long) bucket->aisb);
810 	s390_unregister_adapter_interrupt(zpci_irq_si, PCI_ISC);
811 	isc_unregister(PCI_ISC);
812 	kfree(bucket);
813 }
814 
815 void zpci_debug_info(struct zpci_dev *zdev, struct seq_file *m)
816 {
817 	if (!zdev)
818 		return;
819 
820 	seq_printf(m, "global irq retries: %u\n", atomic_read(&irq_retries));
821 	seq_printf(m, "aibv[0]:%016lx  aibv[1]:%016lx  aisb:%016lx\n",
822 		   get_imap(0)->aibv, get_imap(1)->aibv, *bucket->aisb);
823 }
824 
825 static struct resource *zpci_alloc_bus_resource(unsigned long start, unsigned long size,
826 						unsigned long flags, int domain)
827 {
828 	struct resource *r;
829 	char *name;
830 	int rc;
831 
832 	r = kzalloc(sizeof(*r), GFP_KERNEL);
833 	if (!r)
834 		return ERR_PTR(-ENOMEM);
835 	r->start = start;
836 	r->end = r->start + size - 1;
837 	r->flags = flags;
838 	r->parent = &iomem_resource;
839 	name = kmalloc(18, GFP_KERNEL);
840 	if (!name) {
841 		kfree(r);
842 		return ERR_PTR(-ENOMEM);
843 	}
844 	sprintf(name, "PCI Bus: %04x:%02x", domain, ZPCI_BUS_NR);
845 	r->name = name;
846 
847 	rc = request_resource(&iomem_resource, r);
848 	if (rc)
849 		pr_debug("request resource %pR failed\n", r);
850 	return r;
851 }
852 
853 static int zpci_alloc_iomap(struct zpci_dev *zdev)
854 {
855 	int entry;
856 
857 	spin_lock(&zpci_iomap_lock);
858 	entry = find_first_zero_bit(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
859 	if (entry == ZPCI_IOMAP_MAX_ENTRIES) {
860 		spin_unlock(&zpci_iomap_lock);
861 		return -ENOSPC;
862 	}
863 	set_bit(entry, zpci_iomap);
864 	spin_unlock(&zpci_iomap_lock);
865 	return entry;
866 }
867 
868 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
869 {
870 	spin_lock(&zpci_iomap_lock);
871 	memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
872 	clear_bit(entry, zpci_iomap);
873 	spin_unlock(&zpci_iomap_lock);
874 }
875 
876 static int zpci_create_device_bus(struct zpci_dev *zdev)
877 {
878 	struct resource *res;
879 	LIST_HEAD(resources);
880 	int i;
881 
882 	/* allocate mapping entry for each used bar */
883 	for (i = 0; i < PCI_BAR_COUNT; i++) {
884 		unsigned long addr, size, flags;
885 		int entry;
886 
887 		if (!zdev->bars[i].size)
888 			continue;
889 		entry = zpci_alloc_iomap(zdev);
890 		if (entry < 0)
891 			return entry;
892 		zdev->bars[i].map_idx = entry;
893 
894 		/* only MMIO is supported */
895 		flags = IORESOURCE_MEM;
896 		if (zdev->bars[i].val & 8)
897 			flags |= IORESOURCE_PREFETCH;
898 		if (zdev->bars[i].val & 4)
899 			flags |= IORESOURCE_MEM_64;
900 
901 		addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48);
902 
903 		size = 1UL << zdev->bars[i].size;
904 
905 		res = zpci_alloc_bus_resource(addr, size, flags, zdev->domain);
906 		if (IS_ERR(res)) {
907 			zpci_free_iomap(zdev, entry);
908 			return PTR_ERR(res);
909 		}
910 		pci_add_resource(&resources, res);
911 	}
912 
913 	zdev->bus = pci_create_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
914 					zdev, &resources);
915 	if (!zdev->bus)
916 		return -EIO;
917 
918 	zdev->bus->max_bus_speed = zdev->max_bus_speed;
919 	return 0;
920 }
921 
922 static int zpci_alloc_domain(struct zpci_dev *zdev)
923 {
924 	spin_lock(&zpci_domain_lock);
925 	zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
926 	if (zdev->domain == ZPCI_NR_DEVICES) {
927 		spin_unlock(&zpci_domain_lock);
928 		return -ENOSPC;
929 	}
930 	set_bit(zdev->domain, zpci_domain);
931 	spin_unlock(&zpci_domain_lock);
932 	return 0;
933 }
934 
935 static void zpci_free_domain(struct zpci_dev *zdev)
936 {
937 	spin_lock(&zpci_domain_lock);
938 	clear_bit(zdev->domain, zpci_domain);
939 	spin_unlock(&zpci_domain_lock);
940 }
941 
942 int zpci_enable_device(struct zpci_dev *zdev)
943 {
944 	int rc;
945 
946 	rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
947 	if (rc)
948 		goto out;
949 	pr_info("Enabled fh: 0x%x fid: 0x%x\n", zdev->fh, zdev->fid);
950 
951 	rc = zpci_dma_init_device(zdev);
952 	if (rc)
953 		goto out_dma;
954 	return 0;
955 
956 out_dma:
957 	clp_disable_fh(zdev);
958 out:
959 	return rc;
960 }
961 EXPORT_SYMBOL_GPL(zpci_enable_device);
962 
963 int zpci_create_device(struct zpci_dev *zdev)
964 {
965 	int rc;
966 
967 	rc = zpci_alloc_domain(zdev);
968 	if (rc)
969 		goto out;
970 
971 	rc = zpci_create_device_bus(zdev);
972 	if (rc)
973 		goto out_bus;
974 
975 	mutex_lock(&zpci_list_lock);
976 	list_add_tail(&zdev->entry, &zpci_list);
977 	if (hotplug_ops.create_slot)
978 		hotplug_ops.create_slot(zdev);
979 	mutex_unlock(&zpci_list_lock);
980 
981 	if (zdev->state == ZPCI_FN_STATE_STANDBY)
982 		return 0;
983 
984 	rc = zpci_enable_device(zdev);
985 	if (rc)
986 		goto out_start;
987 	return 0;
988 
989 out_start:
990 	mutex_lock(&zpci_list_lock);
991 	list_del(&zdev->entry);
992 	if (hotplug_ops.remove_slot)
993 		hotplug_ops.remove_slot(zdev);
994 	mutex_unlock(&zpci_list_lock);
995 out_bus:
996 	zpci_free_domain(zdev);
997 out:
998 	return rc;
999 }
1000 
1001 void zpci_stop_device(struct zpci_dev *zdev)
1002 {
1003 	zpci_dma_exit_device(zdev);
1004 	/*
1005 	 * Note: SCLP disables fh via set-pci-fn so don't
1006 	 * do that here.
1007 	 */
1008 }
1009 EXPORT_SYMBOL_GPL(zpci_stop_device);
1010 
1011 int zpci_scan_device(struct zpci_dev *zdev)
1012 {
1013 	zdev->pdev = pci_scan_single_device(zdev->bus, ZPCI_DEVFN);
1014 	if (!zdev->pdev) {
1015 		pr_err("pci_scan_single_device failed for fid: 0x%x\n",
1016 			zdev->fid);
1017 		goto out;
1018 	}
1019 
1020 	zpci_debug_init_device(zdev);
1021 	zpci_fmb_enable_device(zdev);
1022 	zpci_map_resources(zdev);
1023 	pci_bus_add_devices(zdev->bus);
1024 
1025 	/* now that pdev was added to the bus mark it as used */
1026 	zdev->state = ZPCI_FN_STATE_ONLINE;
1027 	return 0;
1028 
1029 out:
1030 	zpci_dma_exit_device(zdev);
1031 	clp_disable_fh(zdev);
1032 	return -EIO;
1033 }
1034 EXPORT_SYMBOL_GPL(zpci_scan_device);
1035 
1036 static inline int barsize(u8 size)
1037 {
1038 	return (size) ? (1 << size) >> 10 : 0;
1039 }
1040 
1041 static int zpci_mem_init(void)
1042 {
1043 	zdev_irq_cache = kmem_cache_create("PCI_IRQ_cache", sizeof(struct zdev_irq_map),
1044 				L1_CACHE_BYTES, SLAB_HWCACHE_ALIGN, NULL);
1045 	if (!zdev_irq_cache)
1046 		goto error_zdev;
1047 
1048 	zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
1049 				16, 0, NULL);
1050 	if (!zdev_fmb_cache)
1051 		goto error_fmb;
1052 
1053 	/* TODO: use realloc */
1054 	zpci_iomap_start = kzalloc(ZPCI_IOMAP_MAX_ENTRIES * sizeof(*zpci_iomap_start),
1055 				   GFP_KERNEL);
1056 	if (!zpci_iomap_start)
1057 		goto error_iomap;
1058 	return 0;
1059 
1060 error_iomap:
1061 	kmem_cache_destroy(zdev_fmb_cache);
1062 error_fmb:
1063 	kmem_cache_destroy(zdev_irq_cache);
1064 error_zdev:
1065 	return -ENOMEM;
1066 }
1067 
1068 static void zpci_mem_exit(void)
1069 {
1070 	kfree(zpci_iomap_start);
1071 	kmem_cache_destroy(zdev_irq_cache);
1072 	kmem_cache_destroy(zdev_fmb_cache);
1073 }
1074 
1075 unsigned int pci_probe = 1;
1076 EXPORT_SYMBOL_GPL(pci_probe);
1077 
1078 char * __init pcibios_setup(char *str)
1079 {
1080 	if (!strcmp(str, "off")) {
1081 		pci_probe = 0;
1082 		return NULL;
1083 	}
1084 	return str;
1085 }
1086 
1087 static int __init pci_base_init(void)
1088 {
1089 	int rc;
1090 
1091 	if (!pci_probe)
1092 		return 0;
1093 
1094 	if (!test_facility(2) || !test_facility(69)
1095 	    || !test_facility(71) || !test_facility(72))
1096 		return 0;
1097 
1098 	pr_info("Probing PCI hardware: PCI:%d  SID:%d  AEN:%d\n",
1099 		test_facility(69), test_facility(70),
1100 		test_facility(71));
1101 
1102 	rc = zpci_debug_init();
1103 	if (rc)
1104 		return rc;
1105 
1106 	rc = zpci_mem_init();
1107 	if (rc)
1108 		goto out_mem;
1109 
1110 	rc = zpci_msihash_init();
1111 	if (rc)
1112 		goto out_hash;
1113 
1114 	rc = zpci_irq_init();
1115 	if (rc)
1116 		goto out_irq;
1117 
1118 	rc = zpci_dma_init();
1119 	if (rc)
1120 		goto out_dma;
1121 
1122 	rc = clp_find_pci_devices();
1123 	if (rc)
1124 		goto out_find;
1125 
1126 	zpci_scan_devices();
1127 	return 0;
1128 
1129 out_find:
1130 	zpci_dma_exit();
1131 out_dma:
1132 	zpci_irq_exit();
1133 out_irq:
1134 	zpci_msihash_exit();
1135 out_hash:
1136 	zpci_mem_exit();
1137 out_mem:
1138 	zpci_debug_exit();
1139 	return rc;
1140 }
1141 subsys_initcall(pci_base_init);
1142