blob: 51d16f1fb5ea40bfee5041028bf8790f33573d1a [file] [log] [blame]
Jan Glaubercd248342012-11-29 12:50:30 +01001/*
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!):
Jan Glauberbedef752012-12-06 14:06:28 +01009 * Alexander Schmidt
10 * Christoph Raisch
11 * Hannes Hering
12 * Hoang-Nam Nguyen
13 * Jan-Bernd Themann
14 * Stefan Roscher
15 * Thomas Klein
Jan Glaubercd248342012-11-29 12:50:30 +010016 */
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>
Jan Glauber9a4da8a2012-11-29 13:05:05 +010026#include <linux/irq.h>
27#include <linux/kernel_stat.h>
Jan Glaubercd248342012-11-29 12:50:30 +010028#include <linux/seq_file.h>
29#include <linux/pci.h>
30#include <linux/msi.h>
31
Jan Glauber9a4da8a2012-11-29 13:05:05 +010032#include <asm/isc.h>
33#include <asm/airq.h>
Jan Glaubercd248342012-11-29 12:50:30 +010034#include <asm/facility.h>
35#include <asm/pci_insn.h>
Jan Glaubera755a452012-11-29 12:55:21 +010036#include <asm/pci_clp.h>
Jan Glauber828b35f2012-11-29 14:33:30 +010037#include <asm/pci_dma.h>
Jan Glaubercd248342012-11-29 12:50:30 +010038
39#define DEBUG /* enable pr_debug */
40
Jan Glauber9a4da8a2012-11-29 13:05:05 +010041#define SIC_IRQ_MODE_ALL 0
42#define SIC_IRQ_MODE_SINGLE 1
43
Jan Glaubercd248342012-11-29 12:50:30 +010044#define ZPCI_NR_DMA_SPACES 1
Jan Glauber9a4da8a2012-11-29 13:05:05 +010045#define ZPCI_MSI_VEC_BITS 6
Jan Glaubercd248342012-11-29 12:50:30 +010046#define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
47
48/* list of all detected zpci devices */
49LIST_HEAD(zpci_list);
Jan Glauber7441b062012-11-29 14:35:47 +010050EXPORT_SYMBOL_GPL(zpci_list);
Jan Glaubercd248342012-11-29 12:50:30 +010051DEFINE_MUTEX(zpci_list_lock);
Jan Glauber7441b062012-11-29 14:35:47 +010052EXPORT_SYMBOL_GPL(zpci_list_lock);
53
Sebastian Ott53923352013-01-31 19:55:17 +010054static struct pci_hp_callback_ops *hotplug_ops;
Jan Glaubercd248342012-11-29 12:50:30 +010055
56static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
57static DEFINE_SPINLOCK(zpci_domain_lock);
58
Jan Glauber9a4da8a2012-11-29 13:05:05 +010059struct callback {
60 irq_handler_t handler;
61 void *data;
62};
63
64struct zdev_irq_map {
65 unsigned long aibv; /* AI bit vector */
66 int msi_vecs; /* consecutive MSI-vectors used */
67 int __unused;
68 struct callback cb[ZPCI_NR_MSI_VECS]; /* callback handler array */
69 spinlock_t lock; /* protect callbacks against de-reg */
70};
71
72struct intr_bucket {
73 /* amap of adapters, one bit per dev, corresponds to one irq nr */
74 unsigned long *alloc;
75 /* AI summary bit, global page for all devices */
76 unsigned long *aisb;
77 /* pointer to aibv and callback data in zdev */
78 struct zdev_irq_map *imap[ZPCI_NR_DEVICES];
79 /* protects the whole bucket struct */
80 spinlock_t lock;
81};
82
83static struct intr_bucket *bucket;
84
85/* Adapter local summary indicator */
86static u8 *zpci_irq_si;
87
88static atomic_t irq_retries = ATOMIC_INIT(0);
89
Jan Glaubercd248342012-11-29 12:50:30 +010090/* I/O Map */
91static DEFINE_SPINLOCK(zpci_iomap_lock);
92static DECLARE_BITMAP(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
93struct zpci_iomap_entry *zpci_iomap_start;
94EXPORT_SYMBOL_GPL(zpci_iomap_start);
95
Jan Glauber9a4da8a2012-11-29 13:05:05 +010096/* highest irq summary bit */
97static int __read_mostly aisb_max;
98
99static struct kmem_cache *zdev_irq_cache;
Jan Glauberd0b08852012-12-11 14:53:35 +0100100static struct kmem_cache *zdev_fmb_cache;
101
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100102static inline int irq_to_msi_nr(unsigned int irq)
103{
104 return irq & ZPCI_MSI_MASK;
105}
106
107static inline int irq_to_dev_nr(unsigned int irq)
108{
109 return irq >> ZPCI_MSI_VEC_BITS;
110}
111
112static inline struct zdev_irq_map *get_imap(unsigned int irq)
113{
114 return bucket->imap[irq_to_dev_nr(irq)];
115}
116
Jan Glaubercd248342012-11-29 12:50:30 +0100117struct zpci_dev *get_zdev(struct pci_dev *pdev)
118{
119 return (struct zpci_dev *) pdev->sysdata;
120}
121
122struct zpci_dev *get_zdev_by_fid(u32 fid)
123{
124 struct zpci_dev *tmp, *zdev = NULL;
125
126 mutex_lock(&zpci_list_lock);
127 list_for_each_entry(tmp, &zpci_list, entry) {
128 if (tmp->fid == fid) {
129 zdev = tmp;
130 break;
131 }
132 }
133 mutex_unlock(&zpci_list_lock);
134 return zdev;
135}
136
137bool zpci_fid_present(u32 fid)
138{
139 return (get_zdev_by_fid(fid) != NULL) ? true : false;
140}
141
142static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
143{
144 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
145}
146
147int pci_domain_nr(struct pci_bus *bus)
148{
149 return ((struct zpci_dev *) bus->sysdata)->domain;
150}
151EXPORT_SYMBOL_GPL(pci_domain_nr);
152
153int pci_proc_domain(struct pci_bus *bus)
154{
155 return pci_domain_nr(bus);
156}
157EXPORT_SYMBOL_GPL(pci_proc_domain);
158
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100159/* Modify PCI: Register adapter interruptions */
160static int zpci_register_airq(struct zpci_dev *zdev, unsigned int aisb,
161 u64 aibv)
162{
163 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
164 struct zpci_fib *fib;
165 int rc;
166
167 fib = (void *) get_zeroed_page(GFP_KERNEL);
168 if (!fib)
169 return -ENOMEM;
170
171 fib->isc = PCI_ISC;
172 fib->noi = zdev->irq_map->msi_vecs;
173 fib->sum = 1; /* enable summary notifications */
174 fib->aibv = aibv;
175 fib->aibvo = 0; /* every function has its own page */
176 fib->aisb = (u64) bucket->aisb + aisb / 8;
177 fib->aisbo = aisb & ZPCI_MSI_MASK;
178
Sebastian Ottb2a9e872013-04-16 14:15:42 +0200179 rc = s390pci_mod_fc(req, fib);
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100180 pr_debug("%s mpcifc returned noi: %d\n", __func__, fib->noi);
181
182 free_page((unsigned long) fib);
183 return rc;
184}
185
186struct mod_pci_args {
187 u64 base;
188 u64 limit;
189 u64 iota;
Jan Glauberd0b08852012-12-11 14:53:35 +0100190 u64 fmb_addr;
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100191};
192
193static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
194{
195 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
196 struct zpci_fib *fib;
197 int rc;
198
199 /* The FIB must be available even if it's not used */
200 fib = (void *) get_zeroed_page(GFP_KERNEL);
201 if (!fib)
202 return -ENOMEM;
203
204 fib->pba = args->base;
205 fib->pal = args->limit;
206 fib->iota = args->iota;
Jan Glauberd0b08852012-12-11 14:53:35 +0100207 fib->fmb_addr = args->fmb_addr;
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100208
Sebastian Ottb2a9e872013-04-16 14:15:42 +0200209 rc = s390pci_mod_fc(req, fib);
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100210 free_page((unsigned long) fib);
211 return rc;
212}
213
Jan Glauber828b35f2012-11-29 14:33:30 +0100214/* Modify PCI: Register I/O address translation parameters */
215int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
216 u64 base, u64 limit, u64 iota)
217{
Jan Glauberd0b08852012-12-11 14:53:35 +0100218 struct mod_pci_args args = { base, limit, iota, 0 };
Jan Glauber828b35f2012-11-29 14:33:30 +0100219
220 WARN_ON_ONCE(iota & 0x3fff);
221 args.iota |= ZPCI_IOTA_RTTO_FLAG;
222 return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
223}
224
225/* Modify PCI: Unregister I/O address translation parameters */
226int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
227{
Jan Glauberd0b08852012-12-11 14:53:35 +0100228 struct mod_pci_args args = { 0, 0, 0, 0 };
Jan Glauber828b35f2012-11-29 14:33:30 +0100229
230 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
231}
232
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100233/* Modify PCI: Unregister adapter interruptions */
234static int zpci_unregister_airq(struct zpci_dev *zdev)
235{
Jan Glauberd0b08852012-12-11 14:53:35 +0100236 struct mod_pci_args args = { 0, 0, 0, 0 };
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100237
238 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args);
239}
240
Jan Glauberd0b08852012-12-11 14:53:35 +0100241/* Modify PCI: Set PCI function measurement parameters */
242int zpci_fmb_enable_device(struct zpci_dev *zdev)
243{
244 struct mod_pci_args args = { 0, 0, 0, 0 };
245
246 if (zdev->fmb)
247 return -EINVAL;
248
Wei Yongjun08b42122013-02-25 22:09:25 +0800249 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
Jan Glauberd0b08852012-12-11 14:53:35 +0100250 if (!zdev->fmb)
251 return -ENOMEM;
Jan Glauberd0b08852012-12-11 14:53:35 +0100252 WARN_ON((u64) zdev->fmb & 0xf);
253
254 args.fmb_addr = virt_to_phys(zdev->fmb);
255 return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
256}
257
258/* Modify PCI: Disable PCI function measurement */
259int zpci_fmb_disable_device(struct zpci_dev *zdev)
260{
261 struct mod_pci_args args = { 0, 0, 0, 0 };
262 int rc;
263
264 if (!zdev->fmb)
265 return -EINVAL;
266
267 /* Function measurement is disabled if fmb address is zero */
268 rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
269
270 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
271 zdev->fmb = NULL;
272 return rc;
273}
274
Jan Glaubercd248342012-11-29 12:50:30 +0100275#define ZPCI_PCIAS_CFGSPC 15
276
277static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
278{
279 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
280 u64 data;
281 int rc;
282
Sebastian Ottb2a9e872013-04-16 14:15:42 +0200283 rc = s390pci_load(&data, req, offset);
Sebastian Ottb170bad2013-04-16 14:17:15 +0200284 if (!rc) {
285 data = data << ((8 - len) * 8);
286 data = le64_to_cpu(data);
Jan Glaubercd248342012-11-29 12:50:30 +0100287 *val = (u32) data;
Sebastian Ottb170bad2013-04-16 14:17:15 +0200288 } else
Jan Glaubercd248342012-11-29 12:50:30 +0100289 *val = 0xffffffff;
290 return rc;
291}
292
293static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
294{
295 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
296 u64 data = val;
297 int rc;
298
299 data = cpu_to_le64(data);
300 data = data >> ((8 - len) * 8);
Sebastian Ottb2a9e872013-04-16 14:15:42 +0200301 rc = s390pci_store(data, req, offset);
Jan Glaubercd248342012-11-29 12:50:30 +0100302 return rc;
303}
304
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100305void synchronize_irq(unsigned int irq)
306{
307 /*
308 * Not needed, the handler is protected by a lock and IRQs that occur
309 * after the handler is deleted are just NOPs.
310 */
311}
312EXPORT_SYMBOL_GPL(synchronize_irq);
313
314void enable_irq(unsigned int irq)
315{
316 struct msi_desc *msi = irq_get_msi_desc(irq);
317
318 zpci_msi_set_mask_bits(msi, 1, 0);
319}
320EXPORT_SYMBOL_GPL(enable_irq);
321
322void disable_irq(unsigned int irq)
323{
324 struct msi_desc *msi = irq_get_msi_desc(irq);
325
326 zpci_msi_set_mask_bits(msi, 1, 1);
327}
328EXPORT_SYMBOL_GPL(disable_irq);
329
330void disable_irq_nosync(unsigned int irq)
331{
332 disable_irq(irq);
333}
334EXPORT_SYMBOL_GPL(disable_irq_nosync);
335
336unsigned long probe_irq_on(void)
337{
338 return 0;
339}
340EXPORT_SYMBOL_GPL(probe_irq_on);
341
342int probe_irq_off(unsigned long val)
343{
344 return 0;
345}
346EXPORT_SYMBOL_GPL(probe_irq_off);
347
348unsigned int probe_irq_mask(unsigned long val)
349{
350 return val;
351}
352EXPORT_SYMBOL_GPL(probe_irq_mask);
353
Greg Kroah-Hartmanb881bc42012-12-21 14:06:37 -0800354void pcibios_fixup_bus(struct pci_bus *bus)
Jan Glaubercd248342012-11-29 12:50:30 +0100355{
356}
357
358resource_size_t pcibios_align_resource(void *data, const struct resource *res,
359 resource_size_t size,
360 resource_size_t align)
361{
362 return 0;
363}
364
Jan Glauber87bc3592012-12-06 14:30:28 +0100365/* combine single writes by using store-block insn */
366void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
367{
368 zpci_memcpy_toio(to, from, count);
369}
370
Jan Glaubercd248342012-11-29 12:50:30 +0100371/* Create a virtual mapping cookie for a PCI BAR */
372void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max)
373{
374 struct zpci_dev *zdev = get_zdev(pdev);
375 u64 addr;
376 int idx;
377
378 if ((bar & 7) != bar)
379 return NULL;
380
381 idx = zdev->bars[bar].map_idx;
382 spin_lock(&zpci_iomap_lock);
383 zpci_iomap_start[idx].fh = zdev->fh;
384 zpci_iomap_start[idx].bar = bar;
385 spin_unlock(&zpci_iomap_lock);
386
387 addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48);
388 return (void __iomem *) addr;
389}
390EXPORT_SYMBOL_GPL(pci_iomap);
391
392void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
393{
394 unsigned int idx;
395
396 idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48;
397 spin_lock(&zpci_iomap_lock);
398 zpci_iomap_start[idx].fh = 0;
399 zpci_iomap_start[idx].bar = 0;
400 spin_unlock(&zpci_iomap_lock);
401}
402EXPORT_SYMBOL_GPL(pci_iounmap);
403
404static int pci_read(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);
408
409 if (!zdev || devfn != ZPCI_DEVFN)
410 return 0;
411 return zpci_cfg_load(zdev, where, val, size);
412}
413
414static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
415 int size, u32 val)
416{
417 struct zpci_dev *zdev = get_zdev_by_bus(bus);
418
419 if (!zdev || devfn != ZPCI_DEVFN)
420 return 0;
421 return zpci_cfg_store(zdev, where, val, size);
422}
423
424static struct pci_ops pci_root_ops = {
425 .read = pci_read,
426 .write = pci_write,
427};
428
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100429/* store the last handled bit to implement fair scheduling of devices */
430static DEFINE_PER_CPU(unsigned long, next_sbit);
431
432static void zpci_irq_handler(void *dont, void *need)
433{
434 unsigned long sbit, mbit, last = 0, start = __get_cpu_var(next_sbit);
435 int rescan = 0, max = aisb_max;
436 struct zdev_irq_map *imap;
437
Heiko Carstens420f42e2013-01-02 15:18:18 +0100438 inc_irq_stat(IRQIO_PCI);
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100439 sbit = start;
440
441scan:
442 /* find summary_bit */
443 for_each_set_bit_left_cont(sbit, bucket->aisb, max) {
444 clear_bit(63 - (sbit & 63), bucket->aisb + (sbit >> 6));
445 last = sbit;
446
447 /* find vector bit */
448 imap = bucket->imap[sbit];
449 for_each_set_bit_left(mbit, &imap->aibv, imap->msi_vecs) {
Heiko Carstens420f42e2013-01-02 15:18:18 +0100450 inc_irq_stat(IRQIO_MSI);
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100451 clear_bit(63 - mbit, &imap->aibv);
452
453 spin_lock(&imap->lock);
454 if (imap->cb[mbit].handler)
455 imap->cb[mbit].handler(mbit,
456 imap->cb[mbit].data);
457 spin_unlock(&imap->lock);
458 }
459 }
460
461 if (rescan)
462 goto out;
463
464 /* scan the skipped bits */
465 if (start > 0) {
466 sbit = 0;
467 max = start;
468 start = 0;
469 goto scan;
470 }
471
472 /* enable interrupts again */
Sebastian Ottb2a9e872013-04-16 14:15:42 +0200473 set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100474
475 /* check again to not lose initiative */
476 rmb();
477 max = aisb_max;
478 sbit = find_first_bit_left(bucket->aisb, max);
479 if (sbit != max) {
480 atomic_inc(&irq_retries);
481 rescan++;
482 goto scan;
483 }
484out:
485 /* store next device bit to scan */
486 __get_cpu_var(next_sbit) = (++last >= aisb_max) ? 0 : last;
487}
488
489/* msi_vecs - number of requested interrupts, 0 place function to error state */
490static int zpci_setup_msi(struct pci_dev *pdev, int msi_vecs)
491{
492 struct zpci_dev *zdev = get_zdev(pdev);
493 unsigned int aisb, msi_nr;
494 struct msi_desc *msi;
495 int rc;
496
497 /* store the number of used MSI vectors */
498 zdev->irq_map->msi_vecs = min(msi_vecs, ZPCI_NR_MSI_VECS);
499
500 spin_lock(&bucket->lock);
501 aisb = find_first_zero_bit(bucket->alloc, PAGE_SIZE);
502 /* alloc map exhausted? */
503 if (aisb == PAGE_SIZE) {
504 spin_unlock(&bucket->lock);
505 return -EIO;
506 }
507 set_bit(aisb, bucket->alloc);
508 spin_unlock(&bucket->lock);
509
510 zdev->aisb = aisb;
511 if (aisb + 1 > aisb_max)
512 aisb_max = aisb + 1;
513
514 /* wire up IRQ shortcut pointer */
515 bucket->imap[zdev->aisb] = zdev->irq_map;
516 pr_debug("%s: imap[%u] linked to %p\n", __func__, zdev->aisb, zdev->irq_map);
517
518 /* TODO: irq number 0 wont be found if we return less than requested MSIs.
519 * ignore it for now and fix in common code.
520 */
521 msi_nr = aisb << ZPCI_MSI_VEC_BITS;
522
523 list_for_each_entry(msi, &pdev->msi_list, list) {
524 rc = zpci_setup_msi_irq(zdev, msi, msi_nr,
525 aisb << ZPCI_MSI_VEC_BITS);
526 if (rc)
527 return rc;
528 msi_nr++;
529 }
530
531 rc = zpci_register_airq(zdev, aisb, (u64) &zdev->irq_map->aibv);
532 if (rc) {
533 clear_bit(aisb, bucket->alloc);
534 dev_err(&pdev->dev, "register MSI failed with: %d\n", rc);
535 return rc;
536 }
537 return (zdev->irq_map->msi_vecs == msi_vecs) ?
538 0 : zdev->irq_map->msi_vecs;
539}
540
541static void zpci_teardown_msi(struct pci_dev *pdev)
542{
543 struct zpci_dev *zdev = get_zdev(pdev);
544 struct msi_desc *msi;
545 int aisb, rc;
546
547 rc = zpci_unregister_airq(zdev);
548 if (rc) {
549 dev_err(&pdev->dev, "deregister MSI failed with: %d\n", rc);
550 return;
551 }
552
553 msi = list_first_entry(&pdev->msi_list, struct msi_desc, list);
554 aisb = irq_to_dev_nr(msi->irq);
555
556 list_for_each_entry(msi, &pdev->msi_list, list)
557 zpci_teardown_msi_irq(zdev, msi);
558
559 clear_bit(aisb, bucket->alloc);
560 if (aisb + 1 == aisb_max)
561 aisb_max--;
562}
563
564int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
565{
566 pr_debug("%s: requesting %d MSI-X interrupts...", __func__, nvec);
567 if (type != PCI_CAP_ID_MSIX && type != PCI_CAP_ID_MSI)
568 return -EINVAL;
569 return zpci_setup_msi(pdev, nvec);
570}
571
572void arch_teardown_msi_irqs(struct pci_dev *pdev)
573{
574 pr_info("%s: on pdev: %p\n", __func__, pdev);
575 zpci_teardown_msi(pdev);
576}
577
Jan Glaubercd248342012-11-29 12:50:30 +0100578static void zpci_map_resources(struct zpci_dev *zdev)
579{
580 struct pci_dev *pdev = zdev->pdev;
581 resource_size_t len;
582 int i;
583
584 for (i = 0; i < PCI_BAR_COUNT; i++) {
585 len = pci_resource_len(pdev, i);
586 if (!len)
587 continue;
588 pdev->resource[i].start = (resource_size_t) pci_iomap(pdev, i, 0);
589 pdev->resource[i].end = pdev->resource[i].start + len - 1;
590 pr_debug("BAR%i: -> start: %Lx end: %Lx\n",
591 i, pdev->resource[i].start, pdev->resource[i].end);
592 }
593};
594
595static void zpci_unmap_resources(struct pci_dev *pdev)
596{
597 resource_size_t len;
598 int i;
599
600 for (i = 0; i < PCI_BAR_COUNT; i++) {
601 len = pci_resource_len(pdev, i);
602 if (!len)
603 continue;
604 pci_iounmap(pdev, (void *) pdev->resource[i].start);
605 }
606};
607
608struct zpci_dev *zpci_alloc_device(void)
609{
610 struct zpci_dev *zdev;
611
612 /* Alloc memory for our private pci device data */
613 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
614 if (!zdev)
615 return ERR_PTR(-ENOMEM);
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100616
617 /* Alloc aibv & callback space */
Wei Yongjun4118fee2012-12-03 16:11:34 +0100618 zdev->irq_map = kmem_cache_zalloc(zdev_irq_cache, GFP_KERNEL);
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100619 if (!zdev->irq_map)
620 goto error;
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100621 WARN_ON((u64) zdev->irq_map & 0xff);
Jan Glaubercd248342012-11-29 12:50:30 +0100622 return zdev;
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100623
624error:
625 kfree(zdev);
626 return ERR_PTR(-ENOMEM);
Jan Glaubercd248342012-11-29 12:50:30 +0100627}
628
629void zpci_free_device(struct zpci_dev *zdev)
630{
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100631 kmem_cache_free(zdev_irq_cache, zdev->irq_map);
Jan Glaubercd248342012-11-29 12:50:30 +0100632 kfree(zdev);
633}
634
635/* Called on removal of pci_dev, leaves zpci and bus device */
636static void zpci_remove_device(struct pci_dev *pdev)
637{
638 struct zpci_dev *zdev = get_zdev(pdev);
639
640 dev_info(&pdev->dev, "Removing device %u\n", zdev->domain);
641 zdev->state = ZPCI_FN_STATE_CONFIGURED;
Jan Glauber828b35f2012-11-29 14:33:30 +0100642 zpci_dma_exit_device(zdev);
Jan Glauberd0b08852012-12-11 14:53:35 +0100643 zpci_fmb_disable_device(zdev);
Jan Glauber1e8da952012-11-29 14:36:55 +0100644 zpci_sysfs_remove_device(&pdev->dev);
Jan Glaubercd248342012-11-29 12:50:30 +0100645 zpci_unmap_resources(pdev);
646 list_del(&zdev->entry); /* can be called from init */
647 zdev->pdev = NULL;
648}
649
650static void zpci_scan_devices(void)
651{
652 struct zpci_dev *zdev;
653
654 mutex_lock(&zpci_list_lock);
655 list_for_each_entry(zdev, &zpci_list, entry)
656 if (zdev->state == ZPCI_FN_STATE_CONFIGURED)
657 zpci_scan_device(zdev);
658 mutex_unlock(&zpci_list_lock);
659}
660
661/*
662 * Too late for any s390 specific setup, since interrupts must be set up
663 * already which requires DMA setup too and the pci scan will access the
664 * config space, which only works if the function handle is enabled.
665 */
666int pcibios_enable_device(struct pci_dev *pdev, int mask)
667{
668 struct resource *res;
669 u16 cmd;
670 int i;
671
672 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
673
674 for (i = 0; i < PCI_BAR_COUNT; i++) {
675 res = &pdev->resource[i];
676
677 if (res->flags & IORESOURCE_IO)
678 return -EINVAL;
679
680 if (res->flags & IORESOURCE_MEM)
681 cmd |= PCI_COMMAND_MEMORY;
682 }
683 pci_write_config_word(pdev, PCI_COMMAND, cmd);
684 return 0;
685}
686
687void pcibios_disable_device(struct pci_dev *pdev)
688{
689 zpci_remove_device(pdev);
690 pdev->sysdata = NULL;
691}
692
Jan Glauber1e8da952012-11-29 14:36:55 +0100693int pcibios_add_platform_entries(struct pci_dev *pdev)
694{
695 return zpci_sysfs_add_device(&pdev->dev);
696}
697
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100698int zpci_request_irq(unsigned int irq, irq_handler_t handler, void *data)
699{
700 int msi_nr = irq_to_msi_nr(irq);
701 struct zdev_irq_map *imap;
702 struct msi_desc *msi;
703
704 msi = irq_get_msi_desc(irq);
705 if (!msi)
706 return -EIO;
707
708 imap = get_imap(irq);
709 spin_lock_init(&imap->lock);
710
711 pr_debug("%s: register handler for IRQ:MSI %d:%d\n", __func__, irq >> 6, msi_nr);
712 imap->cb[msi_nr].handler = handler;
713 imap->cb[msi_nr].data = data;
714
715 /*
716 * The generic MSI code returns with the interrupt disabled on the
717 * card, using the MSI mask bits. Firmware doesn't appear to unmask
718 * at that level, so we do it here by hand.
719 */
720 zpci_msi_set_mask_bits(msi, 1, 0);
721 return 0;
722}
723
724void zpci_free_irq(unsigned int irq)
725{
726 struct zdev_irq_map *imap = get_imap(irq);
727 int msi_nr = irq_to_msi_nr(irq);
728 unsigned long flags;
729
730 pr_debug("%s: for irq: %d\n", __func__, irq);
731
732 spin_lock_irqsave(&imap->lock, flags);
733 imap->cb[msi_nr].handler = NULL;
734 imap->cb[msi_nr].data = NULL;
735 spin_unlock_irqrestore(&imap->lock, flags);
736}
737
738int request_irq(unsigned int irq, irq_handler_t handler,
739 unsigned long irqflags, const char *devname, void *dev_id)
740{
741 pr_debug("%s: irq: %d handler: %p flags: %lx dev: %s\n",
742 __func__, irq, handler, irqflags, devname);
743
744 return zpci_request_irq(irq, handler, dev_id);
745}
746EXPORT_SYMBOL_GPL(request_irq);
747
748void free_irq(unsigned int irq, void *dev_id)
749{
750 zpci_free_irq(irq);
751}
752EXPORT_SYMBOL_GPL(free_irq);
753
754static int __init zpci_irq_init(void)
755{
756 int cpu, rc;
757
758 bucket = kzalloc(sizeof(*bucket), GFP_KERNEL);
759 if (!bucket)
760 return -ENOMEM;
761
762 bucket->aisb = (unsigned long *) get_zeroed_page(GFP_KERNEL);
763 if (!bucket->aisb) {
764 rc = -ENOMEM;
765 goto out_aisb;
766 }
767
768 bucket->alloc = (unsigned long *) get_zeroed_page(GFP_KERNEL);
769 if (!bucket->alloc) {
770 rc = -ENOMEM;
771 goto out_alloc;
772 }
773
774 isc_register(PCI_ISC);
775 zpci_irq_si = s390_register_adapter_interrupt(&zpci_irq_handler, NULL, PCI_ISC);
776 if (IS_ERR(zpci_irq_si)) {
777 rc = PTR_ERR(zpci_irq_si);
778 zpci_irq_si = NULL;
779 goto out_ai;
780 }
781
782 for_each_online_cpu(cpu)
783 per_cpu(next_sbit, cpu) = 0;
784
785 spin_lock_init(&bucket->lock);
786 /* set summary to 1 to be called every time for the ISC */
787 *zpci_irq_si = 1;
Sebastian Ottb2a9e872013-04-16 14:15:42 +0200788 set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
Jan Glauber9a4da8a2012-11-29 13:05:05 +0100789 return 0;
790
791out_ai:
792 isc_unregister(PCI_ISC);
793 free_page((unsigned long) bucket->alloc);
794out_alloc:
795 free_page((unsigned long) bucket->aisb);
796out_aisb:
797 kfree(bucket);
798 return rc;
799}
800
801static void zpci_irq_exit(void)
802{
803 free_page((unsigned long) bucket->alloc);
804 free_page((unsigned long) bucket->aisb);
805 s390_unregister_adapter_interrupt(zpci_irq_si, PCI_ISC);
806 isc_unregister(PCI_ISC);
807 kfree(bucket);
808}
809
Jan Glauberd0b08852012-12-11 14:53:35 +0100810void zpci_debug_info(struct zpci_dev *zdev, struct seq_file *m)
811{
812 if (!zdev)
813 return;
814
815 seq_printf(m, "global irq retries: %u\n", atomic_read(&irq_retries));
816 seq_printf(m, "aibv[0]:%016lx aibv[1]:%016lx aisb:%016lx\n",
817 get_imap(0)->aibv, get_imap(1)->aibv, *bucket->aisb);
818}
819
Jan Glaubercd248342012-11-29 12:50:30 +0100820static struct resource *zpci_alloc_bus_resource(unsigned long start, unsigned long size,
821 unsigned long flags, int domain)
822{
823 struct resource *r;
824 char *name;
825 int rc;
826
827 r = kzalloc(sizeof(*r), GFP_KERNEL);
828 if (!r)
829 return ERR_PTR(-ENOMEM);
830 r->start = start;
831 r->end = r->start + size - 1;
832 r->flags = flags;
833 r->parent = &iomem_resource;
834 name = kmalloc(18, GFP_KERNEL);
835 if (!name) {
836 kfree(r);
837 return ERR_PTR(-ENOMEM);
838 }
839 sprintf(name, "PCI Bus: %04x:%02x", domain, ZPCI_BUS_NR);
840 r->name = name;
841
842 rc = request_resource(&iomem_resource, r);
843 if (rc)
844 pr_debug("request resource %pR failed\n", r);
845 return r;
846}
847
848static int zpci_alloc_iomap(struct zpci_dev *zdev)
849{
850 int entry;
851
852 spin_lock(&zpci_iomap_lock);
853 entry = find_first_zero_bit(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
854 if (entry == ZPCI_IOMAP_MAX_ENTRIES) {
855 spin_unlock(&zpci_iomap_lock);
856 return -ENOSPC;
857 }
858 set_bit(entry, zpci_iomap);
859 spin_unlock(&zpci_iomap_lock);
860 return entry;
861}
862
863static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
864{
865 spin_lock(&zpci_iomap_lock);
866 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
867 clear_bit(entry, zpci_iomap);
868 spin_unlock(&zpci_iomap_lock);
869}
870
Sebastian Ottaf0a8a82013-04-16 14:13:21 +0200871int pcibios_add_device(struct pci_dev *pdev)
872{
873 struct zpci_dev *zdev = get_zdev(pdev);
874
875 zpci_debug_init_device(zdev);
876 zpci_fmb_enable_device(zdev);
877 zpci_map_resources(zdev);
878
879 return 0;
880}
881
Jan Glaubercd248342012-11-29 12:50:30 +0100882static int zpci_create_device_bus(struct zpci_dev *zdev)
883{
884 struct resource *res;
885 LIST_HEAD(resources);
886 int i;
887
888 /* allocate mapping entry for each used bar */
889 for (i = 0; i < PCI_BAR_COUNT; i++) {
890 unsigned long addr, size, flags;
891 int entry;
892
893 if (!zdev->bars[i].size)
894 continue;
895 entry = zpci_alloc_iomap(zdev);
896 if (entry < 0)
897 return entry;
898 zdev->bars[i].map_idx = entry;
899
900 /* only MMIO is supported */
901 flags = IORESOURCE_MEM;
902 if (zdev->bars[i].val & 8)
903 flags |= IORESOURCE_PREFETCH;
904 if (zdev->bars[i].val & 4)
905 flags |= IORESOURCE_MEM_64;
906
907 addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48);
908
909 size = 1UL << zdev->bars[i].size;
910
911 res = zpci_alloc_bus_resource(addr, size, flags, zdev->domain);
912 if (IS_ERR(res)) {
913 zpci_free_iomap(zdev, entry);
914 return PTR_ERR(res);
915 }
916 pci_add_resource(&resources, res);
917 }
918
919 zdev->bus = pci_create_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
920 zdev, &resources);
921 if (!zdev->bus)
922 return -EIO;
923
924 zdev->bus->max_bus_speed = zdev->max_bus_speed;
925 return 0;
926}
927
928static int zpci_alloc_domain(struct zpci_dev *zdev)
929{
930 spin_lock(&zpci_domain_lock);
931 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
932 if (zdev->domain == ZPCI_NR_DEVICES) {
933 spin_unlock(&zpci_domain_lock);
934 return -ENOSPC;
935 }
936 set_bit(zdev->domain, zpci_domain);
937 spin_unlock(&zpci_domain_lock);
938 return 0;
939}
940
941static void zpci_free_domain(struct zpci_dev *zdev)
942{
943 spin_lock(&zpci_domain_lock);
944 clear_bit(zdev->domain, zpci_domain);
945 spin_unlock(&zpci_domain_lock);
946}
947
Jan Glaubera755a452012-11-29 12:55:21 +0100948int zpci_enable_device(struct zpci_dev *zdev)
949{
950 int rc;
951
952 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
953 if (rc)
954 goto out;
955 pr_info("Enabled fh: 0x%x fid: 0x%x\n", zdev->fh, zdev->fid);
Jan Glauber828b35f2012-11-29 14:33:30 +0100956
957 rc = zpci_dma_init_device(zdev);
958 if (rc)
959 goto out_dma;
Jan Glaubera755a452012-11-29 12:55:21 +0100960 return 0;
Jan Glauber828b35f2012-11-29 14:33:30 +0100961
962out_dma:
963 clp_disable_fh(zdev);
Jan Glaubera755a452012-11-29 12:55:21 +0100964out:
965 return rc;
966}
967EXPORT_SYMBOL_GPL(zpci_enable_device);
968
Sebastian Ottcb65a662013-04-16 14:12:17 +0200969int zpci_disable_device(struct zpci_dev *zdev)
970{
971 zpci_dma_exit_device(zdev);
972 return clp_disable_fh(zdev);
973}
974EXPORT_SYMBOL_GPL(zpci_disable_device);
975
Jan Glaubercd248342012-11-29 12:50:30 +0100976int zpci_create_device(struct zpci_dev *zdev)
977{
978 int rc;
979
980 rc = zpci_alloc_domain(zdev);
981 if (rc)
982 goto out;
983
984 rc = zpci_create_device_bus(zdev);
985 if (rc)
986 goto out_bus;
987
988 mutex_lock(&zpci_list_lock);
989 list_add_tail(&zdev->entry, &zpci_list);
Sebastian Ott53923352013-01-31 19:55:17 +0100990 if (hotplug_ops)
991 hotplug_ops->create_slot(zdev);
Jan Glaubercd248342012-11-29 12:50:30 +0100992 mutex_unlock(&zpci_list_lock);
993
994 if (zdev->state == ZPCI_FN_STATE_STANDBY)
995 return 0;
996
Jan Glaubera755a452012-11-29 12:55:21 +0100997 rc = zpci_enable_device(zdev);
998 if (rc)
999 goto out_start;
Jan Glaubercd248342012-11-29 12:50:30 +01001000 return 0;
1001
Jan Glaubera755a452012-11-29 12:55:21 +01001002out_start:
1003 mutex_lock(&zpci_list_lock);
1004 list_del(&zdev->entry);
Sebastian Ott53923352013-01-31 19:55:17 +01001005 if (hotplug_ops)
1006 hotplug_ops->remove_slot(zdev);
Jan Glaubera755a452012-11-29 12:55:21 +01001007 mutex_unlock(&zpci_list_lock);
Jan Glaubercd248342012-11-29 12:50:30 +01001008out_bus:
1009 zpci_free_domain(zdev);
1010out:
1011 return rc;
1012}
1013
1014void zpci_stop_device(struct zpci_dev *zdev)
1015{
Jan Glauber828b35f2012-11-29 14:33:30 +01001016 zpci_dma_exit_device(zdev);
Jan Glaubercd248342012-11-29 12:50:30 +01001017 /*
1018 * Note: SCLP disables fh via set-pci-fn so don't
1019 * do that here.
1020 */
1021}
1022EXPORT_SYMBOL_GPL(zpci_stop_device);
1023
1024int zpci_scan_device(struct zpci_dev *zdev)
1025{
1026 zdev->pdev = pci_scan_single_device(zdev->bus, ZPCI_DEVFN);
1027 if (!zdev->pdev) {
1028 pr_err("pci_scan_single_device failed for fid: 0x%x\n",
1029 zdev->fid);
1030 goto out;
1031 }
1032
Jan Glaubercd248342012-11-29 12:50:30 +01001033 pci_bus_add_devices(zdev->bus);
1034
1035 /* now that pdev was added to the bus mark it as used */
1036 zdev->state = ZPCI_FN_STATE_ONLINE;
1037 return 0;
1038
1039out:
Jan Glauber828b35f2012-11-29 14:33:30 +01001040 zpci_dma_exit_device(zdev);
Jan Glaubera755a452012-11-29 12:55:21 +01001041 clp_disable_fh(zdev);
Jan Glaubercd248342012-11-29 12:50:30 +01001042 return -EIO;
1043}
1044EXPORT_SYMBOL_GPL(zpci_scan_device);
1045
1046static inline int barsize(u8 size)
1047{
1048 return (size) ? (1 << size) >> 10 : 0;
1049}
1050
1051static int zpci_mem_init(void)
1052{
Jan Glauber9a4da8a2012-11-29 13:05:05 +01001053 zdev_irq_cache = kmem_cache_create("PCI_IRQ_cache", sizeof(struct zdev_irq_map),
1054 L1_CACHE_BYTES, SLAB_HWCACHE_ALIGN, NULL);
1055 if (!zdev_irq_cache)
1056 goto error_zdev;
1057
Jan Glauberd0b08852012-12-11 14:53:35 +01001058 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
1059 16, 0, NULL);
1060 if (!zdev_fmb_cache)
1061 goto error_fmb;
1062
Jan Glaubercd248342012-11-29 12:50:30 +01001063 /* TODO: use realloc */
1064 zpci_iomap_start = kzalloc(ZPCI_IOMAP_MAX_ENTRIES * sizeof(*zpci_iomap_start),
1065 GFP_KERNEL);
1066 if (!zpci_iomap_start)
Jan Glauber9a4da8a2012-11-29 13:05:05 +01001067 goto error_iomap;
Jan Glaubercd248342012-11-29 12:50:30 +01001068 return 0;
1069
Jan Glauber9a4da8a2012-11-29 13:05:05 +01001070error_iomap:
Jan Glauberd0b08852012-12-11 14:53:35 +01001071 kmem_cache_destroy(zdev_fmb_cache);
1072error_fmb:
Jan Glauber9a4da8a2012-11-29 13:05:05 +01001073 kmem_cache_destroy(zdev_irq_cache);
Jan Glaubercd248342012-11-29 12:50:30 +01001074error_zdev:
1075 return -ENOMEM;
1076}
1077
1078static void zpci_mem_exit(void)
1079{
1080 kfree(zpci_iomap_start);
Jan Glauber9a4da8a2012-11-29 13:05:05 +01001081 kmem_cache_destroy(zdev_irq_cache);
Jan Glauberd0b08852012-12-11 14:53:35 +01001082 kmem_cache_destroy(zdev_fmb_cache);
Jan Glaubercd248342012-11-29 12:50:30 +01001083}
1084
Sebastian Ott53923352013-01-31 19:55:17 +01001085void zpci_register_hp_ops(struct pci_hp_callback_ops *ops)
1086{
1087 mutex_lock(&zpci_list_lock);
1088 hotplug_ops = ops;
1089 mutex_unlock(&zpci_list_lock);
1090}
1091EXPORT_SYMBOL_GPL(zpci_register_hp_ops);
1092
1093void zpci_deregister_hp_ops(void)
1094{
1095 mutex_lock(&zpci_list_lock);
1096 hotplug_ops = NULL;
1097 mutex_unlock(&zpci_list_lock);
1098}
1099EXPORT_SYMBOL_GPL(zpci_deregister_hp_ops);
1100
Heiko Carstens1e5635d2013-01-30 15:52:16 +01001101unsigned int s390_pci_probe = 1;
1102EXPORT_SYMBOL_GPL(s390_pci_probe);
Jan Glaubercd248342012-11-29 12:50:30 +01001103
1104char * __init pcibios_setup(char *str)
1105{
1106 if (!strcmp(str, "off")) {
Heiko Carstens1e5635d2013-01-30 15:52:16 +01001107 s390_pci_probe = 0;
Jan Glaubercd248342012-11-29 12:50:30 +01001108 return NULL;
1109 }
1110 return str;
1111}
1112
1113static int __init pci_base_init(void)
1114{
1115 int rc;
1116
Heiko Carstens1e5635d2013-01-30 15:52:16 +01001117 if (!s390_pci_probe)
Jan Glaubercd248342012-11-29 12:50:30 +01001118 return 0;
1119
1120 if (!test_facility(2) || !test_facility(69)
1121 || !test_facility(71) || !test_facility(72))
1122 return 0;
1123
1124 pr_info("Probing PCI hardware: PCI:%d SID:%d AEN:%d\n",
1125 test_facility(69), test_facility(70),
1126 test_facility(71));
1127
Jan Glauberd0b08852012-12-11 14:53:35 +01001128 rc = zpci_debug_init();
1129 if (rc)
1130 return rc;
1131
Jan Glaubercd248342012-11-29 12:50:30 +01001132 rc = zpci_mem_init();
1133 if (rc)
1134 goto out_mem;
1135
Jan Glauber9a4da8a2012-11-29 13:05:05 +01001136 rc = zpci_msihash_init();
1137 if (rc)
1138 goto out_hash;
1139
1140 rc = zpci_irq_init();
1141 if (rc)
1142 goto out_irq;
1143
Jan Glauber828b35f2012-11-29 14:33:30 +01001144 rc = zpci_dma_init();
1145 if (rc)
1146 goto out_dma;
1147
Jan Glaubera755a452012-11-29 12:55:21 +01001148 rc = clp_find_pci_devices();
1149 if (rc)
1150 goto out_find;
1151
Jan Glaubercd248342012-11-29 12:50:30 +01001152 zpci_scan_devices();
1153 return 0;
1154
Jan Glaubera755a452012-11-29 12:55:21 +01001155out_find:
Jan Glauber828b35f2012-11-29 14:33:30 +01001156 zpci_dma_exit();
1157out_dma:
Jan Glauber9a4da8a2012-11-29 13:05:05 +01001158 zpci_irq_exit();
1159out_irq:
1160 zpci_msihash_exit();
1161out_hash:
Jan Glaubercd248342012-11-29 12:50:30 +01001162 zpci_mem_exit();
1163out_mem:
Jan Glauberd0b08852012-12-11 14:53:35 +01001164 zpci_debug_exit();
Jan Glaubercd248342012-11-29 12:50:30 +01001165 return rc;
1166}
1167subsys_initcall(pci_base_init);