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 KMSG_COMPONENT "zpci"
19 #define pr_fmt(fmt) KMSG_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_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
47 /* list of all detected zpci devices */
48 static LIST_HEAD(zpci_list);
49 static DEFINE_SPINLOCK(zpci_list_lock);
51 static struct irq_chip zpci_irq_chip = {
53 .irq_unmask = pci_msi_unmask_irq,
54 .irq_mask = pci_msi_mask_irq,
57 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
58 static DEFINE_SPINLOCK(zpci_domain_lock);
60 static struct airq_iv *zpci_aisb_iv;
61 static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];
63 #define ZPCI_IOMAP_ENTRIES \
64 min(((unsigned long) ZPCI_NR_DEVICES * PCI_BAR_COUNT / 2), \
65 ZPCI_IOMAP_MAX_ENTRIES)
67 static DEFINE_SPINLOCK(zpci_iomap_lock);
68 static unsigned long *zpci_iomap_bitmap;
69 struct zpci_iomap_entry *zpci_iomap_start;
70 EXPORT_SYMBOL_GPL(zpci_iomap_start);
72 static struct kmem_cache *zdev_fmb_cache;
74 struct zpci_dev *get_zdev_by_fid(u32 fid)
76 struct zpci_dev *tmp, *zdev = NULL;
78 spin_lock(&zpci_list_lock);
79 list_for_each_entry(tmp, &zpci_list, entry) {
80 if (tmp->fid == fid) {
85 spin_unlock(&zpci_list_lock);
89 void zpci_remove_reserved_devices(void)
91 struct zpci_dev *tmp, *zdev;
92 enum zpci_state state;
95 spin_lock(&zpci_list_lock);
96 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
97 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
98 !clp_get_state(zdev->fid, &state) &&
99 state == ZPCI_FN_STATE_RESERVED)
100 list_move_tail(&zdev->entry, &remove);
102 spin_unlock(&zpci_list_lock);
104 list_for_each_entry_safe(zdev, tmp, &remove, entry)
105 zpci_remove_device(zdev);
108 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
110 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
113 int pci_domain_nr(struct pci_bus *bus)
115 return ((struct zpci_dev *) bus->sysdata)->domain;
117 EXPORT_SYMBOL_GPL(pci_domain_nr);
119 int pci_proc_domain(struct pci_bus *bus)
121 return pci_domain_nr(bus);
123 EXPORT_SYMBOL_GPL(pci_proc_domain);
125 /* Modify PCI: Register adapter interruptions */
126 static int zpci_set_airq(struct zpci_dev *zdev)
128 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
129 struct zpci_fib fib = {0};
133 fib.sum = 1; /* enable summary notifications */
134 fib.noi = airq_iv_end(zdev->aibv);
135 fib.aibv = (unsigned long) zdev->aibv->vector;
136 fib.aibvo = 0; /* each zdev has its own interrupt vector */
137 fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
138 fib.aisbo = zdev->aisb & 63;
140 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
143 /* Modify PCI: Unregister adapter interruptions */
144 static int zpci_clear_airq(struct zpci_dev *zdev)
146 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_DEREG_INT);
147 struct zpci_fib fib = {0};
150 cc = zpci_mod_fc(req, &fib, &status);
151 if (cc == 3 || (cc == 1 && status == 24))
152 /* Function already gone or IRQs already deregistered. */
155 return cc ? -EIO : 0;
158 /* Modify PCI: Register I/O address translation parameters */
159 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
160 u64 base, u64 limit, u64 iota)
162 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
163 struct zpci_fib fib = {0};
166 WARN_ON_ONCE(iota & 0x3fff);
169 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
170 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
173 /* Modify PCI: Unregister I/O address translation parameters */
174 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
176 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
177 struct zpci_fib fib = {0};
180 cc = zpci_mod_fc(req, &fib, &status);
181 if (cc == 3) /* Function already gone. */
183 return cc ? -EIO : 0;
186 /* Modify PCI: Set PCI function measurement parameters */
187 int zpci_fmb_enable_device(struct zpci_dev *zdev)
189 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
190 struct zpci_fib fib = {0};
193 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
196 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
199 WARN_ON((u64) zdev->fmb & 0xf);
201 /* reset software counters */
202 atomic64_set(&zdev->allocated_pages, 0);
203 atomic64_set(&zdev->mapped_pages, 0);
204 atomic64_set(&zdev->unmapped_pages, 0);
206 fib.fmb_addr = virt_to_phys(zdev->fmb);
207 cc = zpci_mod_fc(req, &fib, &status);
209 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
212 return cc ? -EIO : 0;
215 /* Modify PCI: Disable PCI function measurement */
216 int zpci_fmb_disable_device(struct zpci_dev *zdev)
218 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
219 struct zpci_fib fib = {0};
225 /* Function measurement is disabled if fmb address is zero */
226 cc = zpci_mod_fc(req, &fib, &status);
227 if (cc == 3) /* Function already gone. */
231 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
234 return cc ? -EIO : 0;
237 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
239 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
243 rc = zpci_load(&data, req, offset);
245 data = le64_to_cpu((__force __le64) data);
246 data >>= (8 - len) * 8;
253 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
255 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
259 data <<= (8 - len) * 8;
260 data = (__force u64) cpu_to_le64(data);
261 rc = zpci_store(data, req, offset);
265 void pcibios_fixup_bus(struct pci_bus *bus)
269 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
270 resource_size_t size,
271 resource_size_t align)
276 /* combine single writes by using store-block insn */
277 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
279 zpci_memcpy_toio(to, from, count);
282 /* Create a virtual mapping cookie for a PCI BAR */
283 void __iomem *pci_iomap_range(struct pci_dev *pdev,
285 unsigned long offset,
288 struct zpci_dev *zdev = to_zpci(pdev);
291 if (!pci_resource_len(pdev, bar))
294 idx = zdev->bars[bar].map_idx;
295 spin_lock(&zpci_iomap_lock);
297 WARN_ON(!++zpci_iomap_start[idx].count);
298 zpci_iomap_start[idx].fh = zdev->fh;
299 zpci_iomap_start[idx].bar = bar;
300 spin_unlock(&zpci_iomap_lock);
302 return (void __iomem *) ZPCI_ADDR(idx) + offset;
304 EXPORT_SYMBOL(pci_iomap_range);
306 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
308 return pci_iomap_range(dev, bar, 0, maxlen);
310 EXPORT_SYMBOL(pci_iomap);
312 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
314 unsigned int idx = ZPCI_IDX(addr);
316 spin_lock(&zpci_iomap_lock);
317 /* Detect underrun */
318 WARN_ON(!zpci_iomap_start[idx].count);
319 if (!--zpci_iomap_start[idx].count) {
320 zpci_iomap_start[idx].fh = 0;
321 zpci_iomap_start[idx].bar = 0;
323 spin_unlock(&zpci_iomap_lock);
325 EXPORT_SYMBOL(pci_iounmap);
327 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
330 struct zpci_dev *zdev = get_zdev_by_bus(bus);
333 if (!zdev || devfn != ZPCI_DEVFN)
336 ret = zpci_cfg_load(zdev, where, val, size);
341 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
344 struct zpci_dev *zdev = get_zdev_by_bus(bus);
347 if (!zdev || devfn != ZPCI_DEVFN)
350 ret = zpci_cfg_store(zdev, where, val, size);
355 static struct pci_ops pci_root_ops = {
360 static void zpci_irq_handler(struct airq_struct *airq)
362 unsigned long si, ai;
363 struct airq_iv *aibv;
366 inc_irq_stat(IRQIO_PCI);
368 /* Scan adapter summary indicator bit vector */
369 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
372 /* End of second scan with interrupts on. */
374 /* First scan complete, reenable interrupts. */
375 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
380 /* Scan the adapter interrupt vector for this device. */
381 aibv = zpci_aibv[si];
383 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
386 inc_irq_stat(IRQIO_MSI);
387 airq_iv_lock(aibv, ai);
388 generic_handle_irq(airq_iv_get_data(aibv, ai));
389 airq_iv_unlock(aibv, ai);
394 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
396 struct zpci_dev *zdev = to_zpci(pdev);
397 unsigned int hwirq, msi_vecs;
399 struct msi_desc *msi;
404 if (type == PCI_CAP_ID_MSI && nvec > 1)
406 msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
408 /* Allocate adapter summary indicator bit */
409 aisb = airq_iv_alloc_bit(zpci_aisb_iv);
414 /* Create adapter interrupt vector */
415 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
419 /* Wire up shortcut pointer */
420 zpci_aibv[aisb] = zdev->aibv;
422 /* Request MSI interrupts */
424 for_each_pci_msi_entry(msi, pdev) {
426 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */
429 rc = irq_set_msi_desc(irq, msi);
432 irq_set_chip_and_handler(irq, &zpci_irq_chip,
435 msg.address_lo = zdev->msi_addr & 0xffffffff;
436 msg.address_hi = zdev->msi_addr >> 32;
437 pci_write_msi_msg(irq, &msg);
438 airq_iv_set_data(zdev->aibv, hwirq, irq);
442 /* Enable adapter interrupts */
443 rc = zpci_set_airq(zdev);
447 return (msi_vecs == nvec) ? 0 : msi_vecs;
450 void arch_teardown_msi_irqs(struct pci_dev *pdev)
452 struct zpci_dev *zdev = to_zpci(pdev);
453 struct msi_desc *msi;
456 /* Disable adapter interrupts */
457 rc = zpci_clear_airq(zdev);
461 /* Release MSI interrupts */
462 for_each_pci_msi_entry(msi, pdev) {
465 if (msi->msi_attrib.is_msix)
466 __pci_msix_desc_mask_irq(msi, 1);
468 __pci_msi_desc_mask_irq(msi, 1, 1);
469 irq_set_msi_desc(msi->irq, NULL);
470 irq_free_desc(msi->irq);
471 msi->msg.address_lo = 0;
472 msi->msg.address_hi = 0;
477 if (zdev->aisb != -1UL) {
478 zpci_aibv[zdev->aisb] = NULL;
479 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
483 airq_iv_release(zdev->aibv);
488 static void zpci_map_resources(struct pci_dev *pdev)
493 for (i = 0; i < PCI_BAR_COUNT; i++) {
494 len = pci_resource_len(pdev, i);
497 pdev->resource[i].start =
498 (resource_size_t __force) pci_iomap(pdev, i, 0);
499 pdev->resource[i].end = pdev->resource[i].start + len - 1;
503 static void zpci_unmap_resources(struct pci_dev *pdev)
508 for (i = 0; i < PCI_BAR_COUNT; i++) {
509 len = pci_resource_len(pdev, i);
512 pci_iounmap(pdev, (void __iomem __force *)
513 pdev->resource[i].start);
517 static struct airq_struct zpci_airq = {
518 .handler = zpci_irq_handler,
522 static int __init zpci_irq_init(void)
526 rc = register_adapter_interrupt(&zpci_airq);
529 /* Set summary to 1 to be called every time for the ISC. */
530 *zpci_airq.lsi_ptr = 1;
533 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
537 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
541 unregister_adapter_interrupt(&zpci_airq);
546 static void zpci_irq_exit(void)
548 airq_iv_release(zpci_aisb_iv);
549 unregister_adapter_interrupt(&zpci_airq);
552 static int zpci_alloc_iomap(struct zpci_dev *zdev)
556 spin_lock(&zpci_iomap_lock);
557 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
558 if (entry == ZPCI_IOMAP_ENTRIES) {
559 spin_unlock(&zpci_iomap_lock);
562 set_bit(entry, zpci_iomap_bitmap);
563 spin_unlock(&zpci_iomap_lock);
567 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
569 spin_lock(&zpci_iomap_lock);
570 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
571 clear_bit(entry, zpci_iomap_bitmap);
572 spin_unlock(&zpci_iomap_lock);
575 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
576 unsigned long size, unsigned long flags)
580 r = kzalloc(sizeof(*r), GFP_KERNEL);
585 r->end = r->start + size - 1;
587 r->name = zdev->res_name;
589 if (request_resource(&iomem_resource, r)) {
596 static int zpci_setup_bus_resources(struct zpci_dev *zdev,
597 struct list_head *resources)
599 unsigned long addr, size, flags;
600 struct resource *res;
603 snprintf(zdev->res_name, sizeof(zdev->res_name),
604 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
606 for (i = 0; i < PCI_BAR_COUNT; i++) {
607 if (!zdev->bars[i].size)
609 entry = zpci_alloc_iomap(zdev);
612 zdev->bars[i].map_idx = entry;
614 /* only MMIO is supported */
615 flags = IORESOURCE_MEM;
616 if (zdev->bars[i].val & 8)
617 flags |= IORESOURCE_PREFETCH;
618 if (zdev->bars[i].val & 4)
619 flags |= IORESOURCE_MEM_64;
621 addr = ZPCI_ADDR(entry);
622 size = 1UL << zdev->bars[i].size;
624 res = __alloc_res(zdev, addr, size, flags);
626 zpci_free_iomap(zdev, entry);
629 zdev->bars[i].res = res;
630 pci_add_resource(resources, res);
636 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
640 for (i = 0; i < PCI_BAR_COUNT; i++) {
641 if (!zdev->bars[i].size || !zdev->bars[i].res)
644 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
645 release_resource(zdev->bars[i].res);
646 kfree(zdev->bars[i].res);
650 int pcibios_add_device(struct pci_dev *pdev)
652 struct resource *res;
655 pdev->dev.groups = zpci_attr_groups;
656 pdev->dev.dma_ops = &s390_pci_dma_ops;
657 zpci_map_resources(pdev);
659 for (i = 0; i < PCI_BAR_COUNT; i++) {
660 res = &pdev->resource[i];
661 if (res->parent || !res->flags)
663 pci_claim_resource(pdev, i);
669 void pcibios_release_device(struct pci_dev *pdev)
671 zpci_unmap_resources(pdev);
674 int pcibios_enable_device(struct pci_dev *pdev, int mask)
676 struct zpci_dev *zdev = to_zpci(pdev);
678 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
679 zpci_fmb_enable_device(zdev);
681 return pci_enable_resources(pdev, mask);
684 void pcibios_disable_device(struct pci_dev *pdev)
686 struct zpci_dev *zdev = to_zpci(pdev);
688 zpci_fmb_disable_device(zdev);
689 zpci_debug_exit_device(zdev);
692 #ifdef CONFIG_HIBERNATE_CALLBACKS
693 static int zpci_restore(struct device *dev)
695 struct pci_dev *pdev = to_pci_dev(dev);
696 struct zpci_dev *zdev = to_zpci(pdev);
699 if (zdev->state != ZPCI_FN_STATE_ONLINE)
702 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
706 zpci_map_resources(pdev);
707 zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
708 (u64) zdev->dma_table);
714 static int zpci_freeze(struct device *dev)
716 struct pci_dev *pdev = to_pci_dev(dev);
717 struct zpci_dev *zdev = to_zpci(pdev);
719 if (zdev->state != ZPCI_FN_STATE_ONLINE)
722 zpci_unregister_ioat(zdev, 0);
723 zpci_unmap_resources(pdev);
724 return clp_disable_fh(zdev);
727 struct dev_pm_ops pcibios_pm_ops = {
728 .thaw_noirq = zpci_restore,
729 .freeze_noirq = zpci_freeze,
730 .restore_noirq = zpci_restore,
731 .poweroff_noirq = zpci_freeze,
733 #endif /* CONFIG_HIBERNATE_CALLBACKS */
735 static int zpci_alloc_domain(struct zpci_dev *zdev)
737 if (zpci_unique_uid) {
738 zdev->domain = (u16) zdev->uid;
739 if (zdev->domain >= ZPCI_NR_DEVICES)
742 spin_lock(&zpci_domain_lock);
743 if (test_bit(zdev->domain, zpci_domain)) {
744 spin_unlock(&zpci_domain_lock);
747 set_bit(zdev->domain, zpci_domain);
748 spin_unlock(&zpci_domain_lock);
752 spin_lock(&zpci_domain_lock);
753 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
754 if (zdev->domain == ZPCI_NR_DEVICES) {
755 spin_unlock(&zpci_domain_lock);
758 set_bit(zdev->domain, zpci_domain);
759 spin_unlock(&zpci_domain_lock);
763 static void zpci_free_domain(struct zpci_dev *zdev)
765 if (zdev->domain >= ZPCI_NR_DEVICES)
768 spin_lock(&zpci_domain_lock);
769 clear_bit(zdev->domain, zpci_domain);
770 spin_unlock(&zpci_domain_lock);
773 void pcibios_remove_bus(struct pci_bus *bus)
775 struct zpci_dev *zdev = get_zdev_by_bus(bus);
777 zpci_exit_slot(zdev);
778 zpci_cleanup_bus_resources(zdev);
779 zpci_free_domain(zdev);
781 spin_lock(&zpci_list_lock);
782 list_del(&zdev->entry);
783 spin_unlock(&zpci_list_lock);
785 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
789 static int zpci_scan_bus(struct zpci_dev *zdev)
791 LIST_HEAD(resources);
794 ret = zpci_setup_bus_resources(zdev, &resources);
798 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
804 zdev->bus->max_bus_speed = zdev->max_bus_speed;
805 pci_bus_add_devices(zdev->bus);
809 zpci_cleanup_bus_resources(zdev);
810 pci_free_resource_list(&resources);
814 int zpci_enable_device(struct zpci_dev *zdev)
818 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
822 rc = zpci_dma_init_device(zdev);
826 zdev->state = ZPCI_FN_STATE_ONLINE;
830 clp_disable_fh(zdev);
834 EXPORT_SYMBOL_GPL(zpci_enable_device);
836 int zpci_disable_device(struct zpci_dev *zdev)
838 zpci_dma_exit_device(zdev);
839 return clp_disable_fh(zdev);
841 EXPORT_SYMBOL_GPL(zpci_disable_device);
843 int zpci_create_device(struct zpci_dev *zdev)
847 rc = zpci_alloc_domain(zdev);
851 mutex_init(&zdev->lock);
852 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
853 rc = zpci_enable_device(zdev);
857 rc = zpci_scan_bus(zdev);
861 spin_lock(&zpci_list_lock);
862 list_add_tail(&zdev->entry, &zpci_list);
863 spin_unlock(&zpci_list_lock);
865 zpci_init_slot(zdev);
870 if (zdev->state == ZPCI_FN_STATE_ONLINE)
871 zpci_disable_device(zdev);
873 zpci_free_domain(zdev);
878 void zpci_remove_device(struct zpci_dev *zdev)
883 pci_stop_root_bus(zdev->bus);
884 pci_remove_root_bus(zdev->bus);
887 int zpci_report_error(struct pci_dev *pdev,
888 struct zpci_report_error_header *report)
890 struct zpci_dev *zdev = to_zpci(pdev);
892 return sclp_pci_report(report, zdev->fh, zdev->fid);
894 EXPORT_SYMBOL(zpci_report_error);
896 static int zpci_mem_init(void)
898 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
899 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
901 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
902 __alignof__(struct zpci_fmb), 0, NULL);
906 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
907 sizeof(*zpci_iomap_start), GFP_KERNEL);
908 if (!zpci_iomap_start)
911 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
912 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
913 if (!zpci_iomap_bitmap)
914 goto error_iomap_bitmap;
918 kfree(zpci_iomap_start);
920 kmem_cache_destroy(zdev_fmb_cache);
925 static void zpci_mem_exit(void)
927 kfree(zpci_iomap_bitmap);
928 kfree(zpci_iomap_start);
929 kmem_cache_destroy(zdev_fmb_cache);
932 static unsigned int s390_pci_probe = 1;
933 static unsigned int s390_pci_initialized;
935 char * __init pcibios_setup(char *str)
937 if (!strcmp(str, "off")) {
944 bool zpci_is_enabled(void)
946 return s390_pci_initialized;
949 static int __init pci_base_init(void)
956 if (!test_facility(69) || !test_facility(71) || !test_facility(72))
959 rc = zpci_debug_init();
963 rc = zpci_mem_init();
967 rc = zpci_irq_init();
971 rc = zpci_dma_init();
975 rc = clp_scan_pci_devices();
979 s390_pci_initialized = 1;
993 subsys_initcall_sync(pci_base_init);
995 void zpci_rescan(void)
997 if (zpci_is_enabled())
998 clp_rescan_pci_devices_simple();