2 * Copyright IBM Corp. 2012
5 * Jan Glauber <jang@linux.vnet.ibm.com>
7 * The System z PCI code is a rewrite from a prototype by
8 * the following people (Kudoz!):
18 #define COMPONENT "zPCI"
19 #define pr_fmt(fmt) COMPONENT ": " fmt
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>
34 #include <asm/facility.h>
35 #include <asm/pci_insn.h>
36 #include <asm/pci_clp.h>
37 #include <asm/pci_dma.h>
39 #define DEBUG /* enable pr_debug */
41 #define SIC_IRQ_MODE_ALL 0
42 #define SIC_IRQ_MODE_SINGLE 1
44 #define ZPCI_NR_DMA_SPACES 1
45 #define ZPCI_MSI_VEC_BITS 6
46 #define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
48 /* list of all detected zpci devices */
50 EXPORT_SYMBOL_GPL(zpci_list);
51 DEFINE_MUTEX(zpci_list_lock);
52 EXPORT_SYMBOL_GPL(zpci_list_lock);
54 static struct pci_hp_callback_ops *hotplug_ops;
56 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
57 static DEFINE_SPINLOCK(zpci_domain_lock);
60 irq_handler_t handler;
65 unsigned long aibv; /* AI bit vector */
66 int msi_vecs; /* consecutive MSI-vectors used */
68 struct callback cb[ZPCI_NR_MSI_VECS]; /* callback handler array */
69 spinlock_t lock; /* protect callbacks against de-reg */
73 /* amap of adapters, one bit per dev, corresponds to one irq nr */
75 /* AI summary bit, global page for all devices */
77 /* pointer to aibv and callback data in zdev */
78 struct zdev_irq_map *imap[ZPCI_NR_DEVICES];
79 /* protects the whole bucket struct */
83 static struct intr_bucket *bucket;
85 /* Adapter local summary indicator */
86 static u8 *zpci_irq_si;
88 static atomic_t irq_retries = ATOMIC_INIT(0);
91 static DEFINE_SPINLOCK(zpci_iomap_lock);
92 static DECLARE_BITMAP(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
93 struct zpci_iomap_entry *zpci_iomap_start;
94 EXPORT_SYMBOL_GPL(zpci_iomap_start);
96 /* highest irq summary bit */
97 static int __read_mostly aisb_max;
99 static struct kmem_cache *zdev_irq_cache;
100 static struct kmem_cache *zdev_fmb_cache;
102 debug_info_t *pci_debug_msg_id;
103 debug_info_t *pci_debug_err_id;
105 static inline int irq_to_msi_nr(unsigned int irq)
107 return irq & ZPCI_MSI_MASK;
110 static inline int irq_to_dev_nr(unsigned int irq)
112 return irq >> ZPCI_MSI_VEC_BITS;
115 static inline struct zdev_irq_map *get_imap(unsigned int irq)
117 return bucket->imap[irq_to_dev_nr(irq)];
120 struct zpci_dev *get_zdev(struct pci_dev *pdev)
122 return (struct zpci_dev *) pdev->sysdata;
125 struct zpci_dev *get_zdev_by_fid(u32 fid)
127 struct zpci_dev *tmp, *zdev = NULL;
129 mutex_lock(&zpci_list_lock);
130 list_for_each_entry(tmp, &zpci_list, entry) {
131 if (tmp->fid == fid) {
136 mutex_unlock(&zpci_list_lock);
140 bool zpci_fid_present(u32 fid)
142 return (get_zdev_by_fid(fid) != NULL) ? true : false;
145 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
147 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
150 int pci_domain_nr(struct pci_bus *bus)
152 return ((struct zpci_dev *) bus->sysdata)->domain;
154 EXPORT_SYMBOL_GPL(pci_domain_nr);
156 int pci_proc_domain(struct pci_bus *bus)
158 return pci_domain_nr(bus);
160 EXPORT_SYMBOL_GPL(pci_proc_domain);
162 /* Modify PCI: Register adapter interruptions */
163 static int zpci_register_airq(struct zpci_dev *zdev, unsigned int aisb,
166 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
167 struct zpci_fib *fib;
170 fib = (void *) get_zeroed_page(GFP_KERNEL);
175 fib->noi = zdev->irq_map->msi_vecs;
176 fib->sum = 1; /* enable summary notifications */
178 fib->aibvo = 0; /* every function has its own page */
179 fib->aisb = (u64) bucket->aisb + aisb / 8;
180 fib->aisbo = aisb & ZPCI_MSI_MASK;
182 rc = mpcifc_instr(req, fib);
183 pr_debug("%s mpcifc returned noi: %d\n", __func__, fib->noi);
185 free_page((unsigned long) fib);
189 struct mod_pci_args {
196 static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
198 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
199 struct zpci_fib *fib;
202 /* The FIB must be available even if it's not used */
203 fib = (void *) get_zeroed_page(GFP_KERNEL);
207 fib->pba = args->base;
208 fib->pal = args->limit;
209 fib->iota = args->iota;
210 fib->fmb_addr = args->fmb_addr;
212 rc = mpcifc_instr(req, fib);
213 free_page((unsigned long) fib);
217 /* Modify PCI: Register I/O address translation parameters */
218 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
219 u64 base, u64 limit, u64 iota)
221 struct mod_pci_args args = { base, limit, iota, 0 };
223 WARN_ON_ONCE(iota & 0x3fff);
224 args.iota |= ZPCI_IOTA_RTTO_FLAG;
225 return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
228 /* Modify PCI: Unregister I/O address translation parameters */
229 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
231 struct mod_pci_args args = { 0, 0, 0, 0 };
233 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
236 /* Modify PCI: Unregister adapter interruptions */
237 static int zpci_unregister_airq(struct zpci_dev *zdev)
239 struct mod_pci_args args = { 0, 0, 0, 0 };
241 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args);
244 /* Modify PCI: Set PCI function measurement parameters */
245 int zpci_fmb_enable_device(struct zpci_dev *zdev)
247 struct mod_pci_args args = { 0, 0, 0, 0 };
252 zdev->fmb = kmem_cache_alloc(zdev_fmb_cache, GFP_KERNEL);
255 memset(zdev->fmb, 0, sizeof(*zdev->fmb));
256 WARN_ON((u64) zdev->fmb & 0xf);
258 args.fmb_addr = virt_to_phys(zdev->fmb);
259 return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
262 /* Modify PCI: Disable PCI function measurement */
263 int zpci_fmb_disable_device(struct zpci_dev *zdev)
265 struct mod_pci_args args = { 0, 0, 0, 0 };
271 /* Function measurement is disabled if fmb address is zero */
272 rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
274 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
279 #define ZPCI_PCIAS_CFGSPC 15
281 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
283 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
287 rc = pcilg_instr(&data, req, offset);
288 data = data << ((8 - len) * 8);
289 data = le64_to_cpu(data);
297 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
299 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
303 data = cpu_to_le64(data);
304 data = data >> ((8 - len) * 8);
305 rc = pcistg_instr(data, req, offset);
309 void synchronize_irq(unsigned int irq)
312 * Not needed, the handler is protected by a lock and IRQs that occur
313 * after the handler is deleted are just NOPs.
316 EXPORT_SYMBOL_GPL(synchronize_irq);
318 void enable_irq(unsigned int irq)
320 struct msi_desc *msi = irq_get_msi_desc(irq);
322 zpci_msi_set_mask_bits(msi, 1, 0);
324 EXPORT_SYMBOL_GPL(enable_irq);
326 void disable_irq(unsigned int irq)
328 struct msi_desc *msi = irq_get_msi_desc(irq);
330 zpci_msi_set_mask_bits(msi, 1, 1);
332 EXPORT_SYMBOL_GPL(disable_irq);
334 void disable_irq_nosync(unsigned int irq)
338 EXPORT_SYMBOL_GPL(disable_irq_nosync);
340 unsigned long probe_irq_on(void)
344 EXPORT_SYMBOL_GPL(probe_irq_on);
346 int probe_irq_off(unsigned long val)
350 EXPORT_SYMBOL_GPL(probe_irq_off);
352 unsigned int probe_irq_mask(unsigned long val)
356 EXPORT_SYMBOL_GPL(probe_irq_mask);
358 void pcibios_fixup_bus(struct pci_bus *bus)
362 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
363 resource_size_t size,
364 resource_size_t align)
369 /* combine single writes by using store-block insn */
370 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
372 zpci_memcpy_toio(to, from, count);
375 /* Create a virtual mapping cookie for a PCI BAR */
376 void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max)
378 struct zpci_dev *zdev = get_zdev(pdev);
382 if ((bar & 7) != bar)
385 idx = zdev->bars[bar].map_idx;
386 spin_lock(&zpci_iomap_lock);
387 zpci_iomap_start[idx].fh = zdev->fh;
388 zpci_iomap_start[idx].bar = bar;
389 spin_unlock(&zpci_iomap_lock);
391 addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48);
392 return (void __iomem *) addr;
394 EXPORT_SYMBOL_GPL(pci_iomap);
396 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
400 idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48;
401 spin_lock(&zpci_iomap_lock);
402 zpci_iomap_start[idx].fh = 0;
403 zpci_iomap_start[idx].bar = 0;
404 spin_unlock(&zpci_iomap_lock);
406 EXPORT_SYMBOL_GPL(pci_iounmap);
408 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
411 struct zpci_dev *zdev = get_zdev_by_bus(bus);
413 if (!zdev || devfn != ZPCI_DEVFN)
415 return zpci_cfg_load(zdev, where, val, size);
418 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
421 struct zpci_dev *zdev = get_zdev_by_bus(bus);
423 if (!zdev || devfn != ZPCI_DEVFN)
425 return zpci_cfg_store(zdev, where, val, size);
428 static struct pci_ops pci_root_ops = {
433 /* store the last handled bit to implement fair scheduling of devices */
434 static DEFINE_PER_CPU(unsigned long, next_sbit);
436 static void zpci_irq_handler(void *dont, void *need)
438 unsigned long sbit, mbit, last = 0, start = __get_cpu_var(next_sbit);
439 int rescan = 0, max = aisb_max;
440 struct zdev_irq_map *imap;
442 inc_irq_stat(IRQIO_PCI);
446 /* find summary_bit */
447 for_each_set_bit_left_cont(sbit, bucket->aisb, max) {
448 clear_bit(63 - (sbit & 63), bucket->aisb + (sbit >> 6));
451 /* find vector bit */
452 imap = bucket->imap[sbit];
453 for_each_set_bit_left(mbit, &imap->aibv, imap->msi_vecs) {
454 inc_irq_stat(IRQIO_MSI);
455 clear_bit(63 - mbit, &imap->aibv);
457 spin_lock(&imap->lock);
458 if (imap->cb[mbit].handler)
459 imap->cb[mbit].handler(mbit,
460 imap->cb[mbit].data);
461 spin_unlock(&imap->lock);
468 /* scan the skipped bits */
476 /* enable interrupts again */
477 sic_instr(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
479 /* check again to not lose initiative */
482 sbit = find_first_bit_left(bucket->aisb, max);
484 atomic_inc(&irq_retries);
489 /* store next device bit to scan */
490 __get_cpu_var(next_sbit) = (++last >= aisb_max) ? 0 : last;
493 /* msi_vecs - number of requested interrupts, 0 place function to error state */
494 static int zpci_setup_msi(struct pci_dev *pdev, int msi_vecs)
496 struct zpci_dev *zdev = get_zdev(pdev);
497 unsigned int aisb, msi_nr;
498 struct msi_desc *msi;
501 /* store the number of used MSI vectors */
502 zdev->irq_map->msi_vecs = min(msi_vecs, ZPCI_NR_MSI_VECS);
504 spin_lock(&bucket->lock);
505 aisb = find_first_zero_bit(bucket->alloc, PAGE_SIZE);
506 /* alloc map exhausted? */
507 if (aisb == PAGE_SIZE) {
508 spin_unlock(&bucket->lock);
511 set_bit(aisb, bucket->alloc);
512 spin_unlock(&bucket->lock);
515 if (aisb + 1 > aisb_max)
518 /* wire up IRQ shortcut pointer */
519 bucket->imap[zdev->aisb] = zdev->irq_map;
520 pr_debug("%s: imap[%u] linked to %p\n", __func__, zdev->aisb, zdev->irq_map);
522 /* TODO: irq number 0 wont be found if we return less than requested MSIs.
523 * ignore it for now and fix in common code.
525 msi_nr = aisb << ZPCI_MSI_VEC_BITS;
527 list_for_each_entry(msi, &pdev->msi_list, list) {
528 rc = zpci_setup_msi_irq(zdev, msi, msi_nr,
529 aisb << ZPCI_MSI_VEC_BITS);
535 rc = zpci_register_airq(zdev, aisb, (u64) &zdev->irq_map->aibv);
537 clear_bit(aisb, bucket->alloc);
538 dev_err(&pdev->dev, "register MSI failed with: %d\n", rc);
541 return (zdev->irq_map->msi_vecs == msi_vecs) ?
542 0 : zdev->irq_map->msi_vecs;
545 static void zpci_teardown_msi(struct pci_dev *pdev)
547 struct zpci_dev *zdev = get_zdev(pdev);
548 struct msi_desc *msi;
551 rc = zpci_unregister_airq(zdev);
553 dev_err(&pdev->dev, "deregister MSI failed with: %d\n", rc);
557 msi = list_first_entry(&pdev->msi_list, struct msi_desc, list);
558 aisb = irq_to_dev_nr(msi->irq);
560 list_for_each_entry(msi, &pdev->msi_list, list)
561 zpci_teardown_msi_irq(zdev, msi);
563 clear_bit(aisb, bucket->alloc);
564 if (aisb + 1 == aisb_max)
568 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
570 pr_debug("%s: requesting %d MSI-X interrupts...", __func__, nvec);
571 if (type != PCI_CAP_ID_MSIX && type != PCI_CAP_ID_MSI)
573 return zpci_setup_msi(pdev, nvec);
576 void arch_teardown_msi_irqs(struct pci_dev *pdev)
578 pr_info("%s: on pdev: %p\n", __func__, pdev);
579 zpci_teardown_msi(pdev);
582 static void zpci_map_resources(struct zpci_dev *zdev)
584 struct pci_dev *pdev = zdev->pdev;
588 for (i = 0; i < PCI_BAR_COUNT; i++) {
589 len = pci_resource_len(pdev, i);
592 pdev->resource[i].start = (resource_size_t) pci_iomap(pdev, i, 0);
593 pdev->resource[i].end = pdev->resource[i].start + len - 1;
594 pr_debug("BAR%i: -> start: %Lx end: %Lx\n",
595 i, pdev->resource[i].start, pdev->resource[i].end);
599 static void zpci_unmap_resources(struct pci_dev *pdev)
604 for (i = 0; i < PCI_BAR_COUNT; i++) {
605 len = pci_resource_len(pdev, i);
608 pci_iounmap(pdev, (void *) pdev->resource[i].start);
612 struct zpci_dev *zpci_alloc_device(void)
614 struct zpci_dev *zdev;
616 /* Alloc memory for our private pci device data */
617 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
619 return ERR_PTR(-ENOMEM);
621 /* Alloc aibv & callback space */
622 zdev->irq_map = kmem_cache_zalloc(zdev_irq_cache, GFP_KERNEL);
625 WARN_ON((u64) zdev->irq_map & 0xff);
630 return ERR_PTR(-ENOMEM);
633 void zpci_free_device(struct zpci_dev *zdev)
635 kmem_cache_free(zdev_irq_cache, zdev->irq_map);
639 /* Called on removal of pci_dev, leaves zpci and bus device */
640 static void zpci_remove_device(struct pci_dev *pdev)
642 struct zpci_dev *zdev = get_zdev(pdev);
644 dev_info(&pdev->dev, "Removing device %u\n", zdev->domain);
645 zdev->state = ZPCI_FN_STATE_CONFIGURED;
646 zpci_dma_exit_device(zdev);
647 zpci_fmb_disable_device(zdev);
648 zpci_sysfs_remove_device(&pdev->dev);
649 zpci_unmap_resources(pdev);
650 list_del(&zdev->entry); /* can be called from init */
654 static void zpci_scan_devices(void)
656 struct zpci_dev *zdev;
658 mutex_lock(&zpci_list_lock);
659 list_for_each_entry(zdev, &zpci_list, entry)
660 if (zdev->state == ZPCI_FN_STATE_CONFIGURED)
661 zpci_scan_device(zdev);
662 mutex_unlock(&zpci_list_lock);
666 * Too late for any s390 specific setup, since interrupts must be set up
667 * already which requires DMA setup too and the pci scan will access the
668 * config space, which only works if the function handle is enabled.
670 int pcibios_enable_device(struct pci_dev *pdev, int mask)
672 struct resource *res;
676 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
678 for (i = 0; i < PCI_BAR_COUNT; i++) {
679 res = &pdev->resource[i];
681 if (res->flags & IORESOURCE_IO)
684 if (res->flags & IORESOURCE_MEM)
685 cmd |= PCI_COMMAND_MEMORY;
687 pci_write_config_word(pdev, PCI_COMMAND, cmd);
691 void pcibios_disable_device(struct pci_dev *pdev)
693 zpci_remove_device(pdev);
694 pdev->sysdata = NULL;
697 int pcibios_add_platform_entries(struct pci_dev *pdev)
699 return zpci_sysfs_add_device(&pdev->dev);
702 int zpci_request_irq(unsigned int irq, irq_handler_t handler, void *data)
704 int msi_nr = irq_to_msi_nr(irq);
705 struct zdev_irq_map *imap;
706 struct msi_desc *msi;
708 msi = irq_get_msi_desc(irq);
712 imap = get_imap(irq);
713 spin_lock_init(&imap->lock);
715 pr_debug("%s: register handler for IRQ:MSI %d:%d\n", __func__, irq >> 6, msi_nr);
716 imap->cb[msi_nr].handler = handler;
717 imap->cb[msi_nr].data = data;
720 * The generic MSI code returns with the interrupt disabled on the
721 * card, using the MSI mask bits. Firmware doesn't appear to unmask
722 * at that level, so we do it here by hand.
724 zpci_msi_set_mask_bits(msi, 1, 0);
728 void zpci_free_irq(unsigned int irq)
730 struct zdev_irq_map *imap = get_imap(irq);
731 int msi_nr = irq_to_msi_nr(irq);
734 pr_debug("%s: for irq: %d\n", __func__, irq);
736 spin_lock_irqsave(&imap->lock, flags);
737 imap->cb[msi_nr].handler = NULL;
738 imap->cb[msi_nr].data = NULL;
739 spin_unlock_irqrestore(&imap->lock, flags);
742 int request_irq(unsigned int irq, irq_handler_t handler,
743 unsigned long irqflags, const char *devname, void *dev_id)
745 pr_debug("%s: irq: %d handler: %p flags: %lx dev: %s\n",
746 __func__, irq, handler, irqflags, devname);
748 return zpci_request_irq(irq, handler, dev_id);
750 EXPORT_SYMBOL_GPL(request_irq);
752 void free_irq(unsigned int irq, void *dev_id)
756 EXPORT_SYMBOL_GPL(free_irq);
758 static int __init zpci_irq_init(void)
762 bucket = kzalloc(sizeof(*bucket), GFP_KERNEL);
766 bucket->aisb = (unsigned long *) get_zeroed_page(GFP_KERNEL);
772 bucket->alloc = (unsigned long *) get_zeroed_page(GFP_KERNEL);
773 if (!bucket->alloc) {
778 isc_register(PCI_ISC);
779 zpci_irq_si = s390_register_adapter_interrupt(&zpci_irq_handler, NULL, PCI_ISC);
780 if (IS_ERR(zpci_irq_si)) {
781 rc = PTR_ERR(zpci_irq_si);
786 for_each_online_cpu(cpu)
787 per_cpu(next_sbit, cpu) = 0;
789 spin_lock_init(&bucket->lock);
790 /* set summary to 1 to be called every time for the ISC */
792 sic_instr(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
796 isc_unregister(PCI_ISC);
797 free_page((unsigned long) bucket->alloc);
799 free_page((unsigned long) bucket->aisb);
805 static void zpci_irq_exit(void)
807 free_page((unsigned long) bucket->alloc);
808 free_page((unsigned long) bucket->aisb);
809 s390_unregister_adapter_interrupt(zpci_irq_si, PCI_ISC);
810 isc_unregister(PCI_ISC);
814 void zpci_debug_info(struct zpci_dev *zdev, struct seq_file *m)
819 seq_printf(m, "global irq retries: %u\n", atomic_read(&irq_retries));
820 seq_printf(m, "aibv[0]:%016lx aibv[1]:%016lx aisb:%016lx\n",
821 get_imap(0)->aibv, get_imap(1)->aibv, *bucket->aisb);
824 static struct resource *zpci_alloc_bus_resource(unsigned long start, unsigned long size,
825 unsigned long flags, int domain)
831 r = kzalloc(sizeof(*r), GFP_KERNEL);
833 return ERR_PTR(-ENOMEM);
835 r->end = r->start + size - 1;
837 r->parent = &iomem_resource;
838 name = kmalloc(18, GFP_KERNEL);
841 return ERR_PTR(-ENOMEM);
843 sprintf(name, "PCI Bus: %04x:%02x", domain, ZPCI_BUS_NR);
846 rc = request_resource(&iomem_resource, r);
848 pr_debug("request resource %pR failed\n", r);
852 static int zpci_alloc_iomap(struct zpci_dev *zdev)
856 spin_lock(&zpci_iomap_lock);
857 entry = find_first_zero_bit(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
858 if (entry == ZPCI_IOMAP_MAX_ENTRIES) {
859 spin_unlock(&zpci_iomap_lock);
862 set_bit(entry, zpci_iomap);
863 spin_unlock(&zpci_iomap_lock);
867 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
869 spin_lock(&zpci_iomap_lock);
870 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
871 clear_bit(entry, zpci_iomap);
872 spin_unlock(&zpci_iomap_lock);
875 static int zpci_create_device_bus(struct zpci_dev *zdev)
877 struct resource *res;
878 LIST_HEAD(resources);
881 /* allocate mapping entry for each used bar */
882 for (i = 0; i < PCI_BAR_COUNT; i++) {
883 unsigned long addr, size, flags;
886 if (!zdev->bars[i].size)
888 entry = zpci_alloc_iomap(zdev);
891 zdev->bars[i].map_idx = entry;
893 /* only MMIO is supported */
894 flags = IORESOURCE_MEM;
895 if (zdev->bars[i].val & 8)
896 flags |= IORESOURCE_PREFETCH;
897 if (zdev->bars[i].val & 4)
898 flags |= IORESOURCE_MEM_64;
900 addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48);
902 size = 1UL << zdev->bars[i].size;
904 res = zpci_alloc_bus_resource(addr, size, flags, zdev->domain);
906 zpci_free_iomap(zdev, entry);
909 pci_add_resource(&resources, res);
912 zdev->bus = pci_create_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
917 zdev->bus->max_bus_speed = zdev->max_bus_speed;
921 static int zpci_alloc_domain(struct zpci_dev *zdev)
923 spin_lock(&zpci_domain_lock);
924 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
925 if (zdev->domain == ZPCI_NR_DEVICES) {
926 spin_unlock(&zpci_domain_lock);
929 set_bit(zdev->domain, zpci_domain);
930 spin_unlock(&zpci_domain_lock);
934 static void zpci_free_domain(struct zpci_dev *zdev)
936 spin_lock(&zpci_domain_lock);
937 clear_bit(zdev->domain, zpci_domain);
938 spin_unlock(&zpci_domain_lock);
941 int zpci_enable_device(struct zpci_dev *zdev)
945 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
948 pr_info("Enabled fh: 0x%x fid: 0x%x\n", zdev->fh, zdev->fid);
950 rc = zpci_dma_init_device(zdev);
956 clp_disable_fh(zdev);
960 EXPORT_SYMBOL_GPL(zpci_enable_device);
962 int zpci_create_device(struct zpci_dev *zdev)
966 rc = zpci_alloc_domain(zdev);
970 rc = zpci_create_device_bus(zdev);
974 mutex_lock(&zpci_list_lock);
975 list_add_tail(&zdev->entry, &zpci_list);
977 hotplug_ops->create_slot(zdev);
978 mutex_unlock(&zpci_list_lock);
980 if (zdev->state == ZPCI_FN_STATE_STANDBY)
983 rc = zpci_enable_device(zdev);
989 mutex_lock(&zpci_list_lock);
990 list_del(&zdev->entry);
992 hotplug_ops->remove_slot(zdev);
993 mutex_unlock(&zpci_list_lock);
995 zpci_free_domain(zdev);
1000 void zpci_stop_device(struct zpci_dev *zdev)
1002 zpci_dma_exit_device(zdev);
1004 * Note: SCLP disables fh via set-pci-fn so don't
1008 EXPORT_SYMBOL_GPL(zpci_stop_device);
1010 int zpci_scan_device(struct zpci_dev *zdev)
1012 zdev->pdev = pci_scan_single_device(zdev->bus, ZPCI_DEVFN);
1014 pr_err("pci_scan_single_device failed for fid: 0x%x\n",
1019 zpci_debug_init_device(zdev);
1020 zpci_fmb_enable_device(zdev);
1021 zpci_map_resources(zdev);
1022 pci_bus_add_devices(zdev->bus);
1024 /* now that pdev was added to the bus mark it as used */
1025 zdev->state = ZPCI_FN_STATE_ONLINE;
1029 zpci_dma_exit_device(zdev);
1030 clp_disable_fh(zdev);
1033 EXPORT_SYMBOL_GPL(zpci_scan_device);
1035 static inline int barsize(u8 size)
1037 return (size) ? (1 << size) >> 10 : 0;
1040 static int zpci_mem_init(void)
1042 zdev_irq_cache = kmem_cache_create("PCI_IRQ_cache", sizeof(struct zdev_irq_map),
1043 L1_CACHE_BYTES, SLAB_HWCACHE_ALIGN, NULL);
1044 if (!zdev_irq_cache)
1047 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
1049 if (!zdev_fmb_cache)
1052 /* TODO: use realloc */
1053 zpci_iomap_start = kzalloc(ZPCI_IOMAP_MAX_ENTRIES * sizeof(*zpci_iomap_start),
1055 if (!zpci_iomap_start)
1060 kmem_cache_destroy(zdev_fmb_cache);
1062 kmem_cache_destroy(zdev_irq_cache);
1067 static void zpci_mem_exit(void)
1069 kfree(zpci_iomap_start);
1070 kmem_cache_destroy(zdev_irq_cache);
1071 kmem_cache_destroy(zdev_fmb_cache);
1074 void zpci_register_hp_ops(struct pci_hp_callback_ops *ops)
1076 mutex_lock(&zpci_list_lock);
1078 mutex_unlock(&zpci_list_lock);
1080 EXPORT_SYMBOL_GPL(zpci_register_hp_ops);
1082 void zpci_deregister_hp_ops(void)
1084 mutex_lock(&zpci_list_lock);
1086 mutex_unlock(&zpci_list_lock);
1088 EXPORT_SYMBOL_GPL(zpci_deregister_hp_ops);
1090 unsigned int s390_pci_probe = 1;
1091 EXPORT_SYMBOL_GPL(s390_pci_probe);
1093 char * __init pcibios_setup(char *str)
1095 if (!strcmp(str, "off")) {
1102 static int __init pci_base_init(void)
1106 if (!s390_pci_probe)
1109 if (!test_facility(2) || !test_facility(69)
1110 || !test_facility(71) || !test_facility(72))
1113 pr_info("Probing PCI hardware: PCI:%d SID:%d AEN:%d\n",
1114 test_facility(69), test_facility(70),
1117 rc = zpci_debug_init();
1121 rc = zpci_mem_init();
1125 rc = zpci_msihash_init();
1129 rc = zpci_irq_init();
1133 rc = zpci_dma_init();
1137 rc = clp_find_pci_devices();
1141 zpci_scan_devices();
1149 zpci_msihash_exit();
1156 subsys_initcall(pci_base_init);