1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright IBM Corp. 2012
6 * Jan Glauber <jang@linux.vnet.ibm.com>
8 * The System z PCI code is a rewrite from a prototype by
9 * the following people (Kudoz!):
19 #define KMSG_COMPONENT "zpci"
20 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
22 #include <linux/kernel.h>
23 #include <linux/slab.h>
24 #include <linux/err.h>
25 #include <linux/export.h>
26 #include <linux/delay.h>
27 #include <linux/seq_file.h>
28 #include <linux/jump_label.h>
29 #include <linux/pci.h>
33 #include <asm/facility.h>
34 #include <asm/pci_insn.h>
35 #include <asm/pci_clp.h>
36 #include <asm/pci_dma.h>
38 /* list of all detected zpci devices */
39 static LIST_HEAD(zpci_list);
40 static DEFINE_SPINLOCK(zpci_list_lock);
42 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
43 static DEFINE_SPINLOCK(zpci_domain_lock);
45 #define ZPCI_IOMAP_ENTRIES \
46 min(((unsigned long) ZPCI_NR_DEVICES * PCI_BAR_COUNT / 2), \
47 ZPCI_IOMAP_MAX_ENTRIES)
49 static DEFINE_SPINLOCK(zpci_iomap_lock);
50 static unsigned long *zpci_iomap_bitmap;
51 struct zpci_iomap_entry *zpci_iomap_start;
52 EXPORT_SYMBOL_GPL(zpci_iomap_start);
54 DEFINE_STATIC_KEY_FALSE(have_mio);
56 static struct kmem_cache *zdev_fmb_cache;
58 struct zpci_dev *get_zdev_by_fid(u32 fid)
60 struct zpci_dev *tmp, *zdev = NULL;
62 spin_lock(&zpci_list_lock);
63 list_for_each_entry(tmp, &zpci_list, entry) {
64 if (tmp->fid == fid) {
69 spin_unlock(&zpci_list_lock);
73 void zpci_remove_reserved_devices(void)
75 struct zpci_dev *tmp, *zdev;
76 enum zpci_state state;
79 spin_lock(&zpci_list_lock);
80 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
81 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
82 !clp_get_state(zdev->fid, &state) &&
83 state == ZPCI_FN_STATE_RESERVED)
84 list_move_tail(&zdev->entry, &remove);
86 spin_unlock(&zpci_list_lock);
88 list_for_each_entry_safe(zdev, tmp, &remove, entry)
89 zpci_remove_device(zdev);
92 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
94 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
97 int pci_domain_nr(struct pci_bus *bus)
99 return ((struct zpci_dev *) bus->sysdata)->domain;
101 EXPORT_SYMBOL_GPL(pci_domain_nr);
103 int pci_proc_domain(struct pci_bus *bus)
105 return pci_domain_nr(bus);
107 EXPORT_SYMBOL_GPL(pci_proc_domain);
109 /* Modify PCI: Register I/O address translation parameters */
110 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
111 u64 base, u64 limit, u64 iota)
113 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
114 struct zpci_fib fib = {0};
117 WARN_ON_ONCE(iota & 0x3fff);
120 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
121 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
124 /* Modify PCI: Unregister I/O address translation parameters */
125 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
127 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
128 struct zpci_fib fib = {0};
131 cc = zpci_mod_fc(req, &fib, &status);
132 if (cc == 3) /* Function already gone. */
134 return cc ? -EIO : 0;
137 /* Modify PCI: Set PCI function measurement parameters */
138 int zpci_fmb_enable_device(struct zpci_dev *zdev)
140 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
141 struct zpci_fib fib = {0};
144 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
147 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
150 WARN_ON((u64) zdev->fmb & 0xf);
152 /* reset software counters */
153 atomic64_set(&zdev->allocated_pages, 0);
154 atomic64_set(&zdev->mapped_pages, 0);
155 atomic64_set(&zdev->unmapped_pages, 0);
157 fib.fmb_addr = virt_to_phys(zdev->fmb);
158 cc = zpci_mod_fc(req, &fib, &status);
160 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
163 return cc ? -EIO : 0;
166 /* Modify PCI: Disable PCI function measurement */
167 int zpci_fmb_disable_device(struct zpci_dev *zdev)
169 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
170 struct zpci_fib fib = {0};
176 /* Function measurement is disabled if fmb address is zero */
177 cc = zpci_mod_fc(req, &fib, &status);
178 if (cc == 3) /* Function already gone. */
182 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
185 return cc ? -EIO : 0;
188 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
190 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
194 rc = __zpci_load(&data, req, offset);
196 data = le64_to_cpu((__force __le64) data);
197 data >>= (8 - len) * 8;
204 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
206 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
210 data <<= (8 - len) * 8;
211 data = (__force u64) cpu_to_le64(data);
212 rc = __zpci_store(data, req, offset);
216 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
217 resource_size_t size,
218 resource_size_t align)
223 /* combine single writes by using store-block insn */
224 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
226 zpci_memcpy_toio(to, from, count);
229 void __iomem *ioremap(unsigned long ioaddr, unsigned long size)
231 struct vm_struct *area;
232 unsigned long offset;
237 if (!static_branch_unlikely(&have_mio))
238 return (void __iomem *) ioaddr;
240 offset = ioaddr & ~PAGE_MASK;
242 size = PAGE_ALIGN(size + offset);
243 area = get_vm_area(size, VM_IOREMAP);
247 if (ioremap_page_range((unsigned long) area->addr,
248 (unsigned long) area->addr + size,
249 ioaddr, PAGE_KERNEL)) {
253 return (void __iomem *) ((unsigned long) area->addr + offset);
255 EXPORT_SYMBOL(ioremap);
257 void iounmap(volatile void __iomem *addr)
259 if (static_branch_likely(&have_mio))
260 vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
262 EXPORT_SYMBOL(iounmap);
264 /* Create a virtual mapping cookie for a PCI BAR */
265 static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
266 unsigned long offset, unsigned long max)
268 struct zpci_dev *zdev = to_zpci(pdev);
271 idx = zdev->bars[bar].map_idx;
272 spin_lock(&zpci_iomap_lock);
274 WARN_ON(!++zpci_iomap_start[idx].count);
275 zpci_iomap_start[idx].fh = zdev->fh;
276 zpci_iomap_start[idx].bar = bar;
277 spin_unlock(&zpci_iomap_lock);
279 return (void __iomem *) ZPCI_ADDR(idx) + offset;
282 static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
283 unsigned long offset,
286 unsigned long barsize = pci_resource_len(pdev, bar);
287 struct zpci_dev *zdev = to_zpci(pdev);
290 iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
291 return iova ? iova + offset : iova;
294 void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
295 unsigned long offset, unsigned long max)
297 if (!pci_resource_len(pdev, bar) || bar >= PCI_BAR_COUNT)
300 if (static_branch_likely(&have_mio))
301 return pci_iomap_range_mio(pdev, bar, offset, max);
303 return pci_iomap_range_fh(pdev, bar, offset, max);
305 EXPORT_SYMBOL(pci_iomap_range);
307 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
309 return pci_iomap_range(dev, bar, 0, maxlen);
311 EXPORT_SYMBOL(pci_iomap);
313 static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
314 unsigned long offset, unsigned long max)
316 unsigned long barsize = pci_resource_len(pdev, bar);
317 struct zpci_dev *zdev = to_zpci(pdev);
320 iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
321 return iova ? iova + offset : iova;
324 void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
325 unsigned long offset, unsigned long max)
327 if (!pci_resource_len(pdev, bar) || bar >= PCI_BAR_COUNT)
330 if (static_branch_likely(&have_mio))
331 return pci_iomap_wc_range_mio(pdev, bar, offset, max);
333 return pci_iomap_range_fh(pdev, bar, offset, max);
335 EXPORT_SYMBOL(pci_iomap_wc_range);
337 void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
339 return pci_iomap_wc_range(dev, bar, 0, maxlen);
341 EXPORT_SYMBOL(pci_iomap_wc);
343 static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
345 unsigned int idx = ZPCI_IDX(addr);
347 spin_lock(&zpci_iomap_lock);
348 /* Detect underrun */
349 WARN_ON(!zpci_iomap_start[idx].count);
350 if (!--zpci_iomap_start[idx].count) {
351 zpci_iomap_start[idx].fh = 0;
352 zpci_iomap_start[idx].bar = 0;
354 spin_unlock(&zpci_iomap_lock);
357 static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
362 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
364 if (static_branch_likely(&have_mio))
365 pci_iounmap_mio(pdev, addr);
367 pci_iounmap_fh(pdev, addr);
369 EXPORT_SYMBOL(pci_iounmap);
371 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
374 struct zpci_dev *zdev = get_zdev_by_bus(bus);
377 if (!zdev || devfn != ZPCI_DEVFN)
380 ret = zpci_cfg_load(zdev, where, val, size);
385 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
388 struct zpci_dev *zdev = get_zdev_by_bus(bus);
391 if (!zdev || devfn != ZPCI_DEVFN)
394 ret = zpci_cfg_store(zdev, where, val, size);
399 static struct pci_ops pci_root_ops = {
404 #ifdef CONFIG_PCI_IOV
405 static struct resource iov_res = {
406 .name = "PCI IOV res",
409 .flags = IORESOURCE_MEM,
413 static void zpci_map_resources(struct pci_dev *pdev)
415 struct zpci_dev *zdev = to_zpci(pdev);
419 for (i = 0; i < PCI_BAR_COUNT; i++) {
420 len = pci_resource_len(pdev, i);
424 if (static_branch_likely(&have_mio))
425 pdev->resource[i].start =
426 (resource_size_t __force) zdev->bars[i].mio_wb;
428 pdev->resource[i].start =
429 (resource_size_t __force) pci_iomap(pdev, i, 0);
430 pdev->resource[i].end = pdev->resource[i].start + len - 1;
433 #ifdef CONFIG_PCI_IOV
434 i = PCI_IOV_RESOURCES;
436 for (; i < PCI_SRIOV_NUM_BARS + PCI_IOV_RESOURCES; i++) {
437 len = pci_resource_len(pdev, i);
440 pdev->resource[i].parent = &iov_res;
445 static void zpci_unmap_resources(struct pci_dev *pdev)
450 if (static_branch_likely(&have_mio))
453 for (i = 0; i < PCI_BAR_COUNT; i++) {
454 len = pci_resource_len(pdev, i);
457 pci_iounmap(pdev, (void __iomem __force *)
458 pdev->resource[i].start);
462 static int zpci_alloc_iomap(struct zpci_dev *zdev)
466 spin_lock(&zpci_iomap_lock);
467 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
468 if (entry == ZPCI_IOMAP_ENTRIES) {
469 spin_unlock(&zpci_iomap_lock);
472 set_bit(entry, zpci_iomap_bitmap);
473 spin_unlock(&zpci_iomap_lock);
477 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
479 spin_lock(&zpci_iomap_lock);
480 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
481 clear_bit(entry, zpci_iomap_bitmap);
482 spin_unlock(&zpci_iomap_lock);
485 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
486 unsigned long size, unsigned long flags)
490 r = kzalloc(sizeof(*r), GFP_KERNEL);
495 r->end = r->start + size - 1;
497 r->name = zdev->res_name;
499 if (request_resource(&iomem_resource, r)) {
506 static int zpci_setup_bus_resources(struct zpci_dev *zdev,
507 struct list_head *resources)
509 unsigned long addr, size, flags;
510 struct resource *res;
513 snprintf(zdev->res_name, sizeof(zdev->res_name),
514 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
516 for (i = 0; i < PCI_BAR_COUNT; i++) {
517 if (!zdev->bars[i].size)
519 entry = zpci_alloc_iomap(zdev);
522 zdev->bars[i].map_idx = entry;
524 /* only MMIO is supported */
525 flags = IORESOURCE_MEM;
526 if (zdev->bars[i].val & 8)
527 flags |= IORESOURCE_PREFETCH;
528 if (zdev->bars[i].val & 4)
529 flags |= IORESOURCE_MEM_64;
531 if (static_branch_likely(&have_mio))
532 addr = (unsigned long) zdev->bars[i].mio_wb;
534 addr = ZPCI_ADDR(entry);
535 size = 1UL << zdev->bars[i].size;
537 res = __alloc_res(zdev, addr, size, flags);
539 zpci_free_iomap(zdev, entry);
542 zdev->bars[i].res = res;
543 pci_add_resource(resources, res);
549 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
553 for (i = 0; i < PCI_BAR_COUNT; i++) {
554 if (!zdev->bars[i].size || !zdev->bars[i].res)
557 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
558 release_resource(zdev->bars[i].res);
559 kfree(zdev->bars[i].res);
563 int pcibios_add_device(struct pci_dev *pdev)
565 struct resource *res;
569 pdev->no_vf_scan = 1;
571 pdev->dev.groups = zpci_attr_groups;
572 pdev->dev.dma_ops = &s390_pci_dma_ops;
573 zpci_map_resources(pdev);
575 for (i = 0; i < PCI_BAR_COUNT; i++) {
576 res = &pdev->resource[i];
577 if (res->parent || !res->flags)
579 pci_claim_resource(pdev, i);
585 void pcibios_release_device(struct pci_dev *pdev)
587 zpci_unmap_resources(pdev);
590 int pcibios_enable_device(struct pci_dev *pdev, int mask)
592 struct zpci_dev *zdev = to_zpci(pdev);
594 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
595 zpci_fmb_enable_device(zdev);
597 return pci_enable_resources(pdev, mask);
600 void pcibios_disable_device(struct pci_dev *pdev)
602 struct zpci_dev *zdev = to_zpci(pdev);
604 zpci_fmb_disable_device(zdev);
605 zpci_debug_exit_device(zdev);
608 #ifdef CONFIG_HIBERNATE_CALLBACKS
609 static int zpci_restore(struct device *dev)
611 struct pci_dev *pdev = to_pci_dev(dev);
612 struct zpci_dev *zdev = to_zpci(pdev);
615 if (zdev->state != ZPCI_FN_STATE_ONLINE)
618 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
622 zpci_map_resources(pdev);
623 zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
624 (u64) zdev->dma_table);
630 static int zpci_freeze(struct device *dev)
632 struct pci_dev *pdev = to_pci_dev(dev);
633 struct zpci_dev *zdev = to_zpci(pdev);
635 if (zdev->state != ZPCI_FN_STATE_ONLINE)
638 zpci_unregister_ioat(zdev, 0);
639 zpci_unmap_resources(pdev);
640 return clp_disable_fh(zdev);
643 struct dev_pm_ops pcibios_pm_ops = {
644 .thaw_noirq = zpci_restore,
645 .freeze_noirq = zpci_freeze,
646 .restore_noirq = zpci_restore,
647 .poweroff_noirq = zpci_freeze,
649 #endif /* CONFIG_HIBERNATE_CALLBACKS */
651 static int zpci_alloc_domain(struct zpci_dev *zdev)
653 if (zpci_unique_uid) {
654 zdev->domain = (u16) zdev->uid;
655 if (zdev->domain >= ZPCI_NR_DEVICES)
658 spin_lock(&zpci_domain_lock);
659 if (test_bit(zdev->domain, zpci_domain)) {
660 spin_unlock(&zpci_domain_lock);
663 set_bit(zdev->domain, zpci_domain);
664 spin_unlock(&zpci_domain_lock);
668 spin_lock(&zpci_domain_lock);
669 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
670 if (zdev->domain == ZPCI_NR_DEVICES) {
671 spin_unlock(&zpci_domain_lock);
674 set_bit(zdev->domain, zpci_domain);
675 spin_unlock(&zpci_domain_lock);
679 static void zpci_free_domain(struct zpci_dev *zdev)
681 if (zdev->domain >= ZPCI_NR_DEVICES)
684 spin_lock(&zpci_domain_lock);
685 clear_bit(zdev->domain, zpci_domain);
686 spin_unlock(&zpci_domain_lock);
689 void pcibios_remove_bus(struct pci_bus *bus)
691 struct zpci_dev *zdev = get_zdev_by_bus(bus);
693 zpci_exit_slot(zdev);
694 zpci_cleanup_bus_resources(zdev);
695 zpci_destroy_iommu(zdev);
696 zpci_free_domain(zdev);
698 spin_lock(&zpci_list_lock);
699 list_del(&zdev->entry);
700 spin_unlock(&zpci_list_lock);
702 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
706 static int zpci_scan_bus(struct zpci_dev *zdev)
708 LIST_HEAD(resources);
711 ret = zpci_setup_bus_resources(zdev, &resources);
715 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
721 zdev->bus->max_bus_speed = zdev->max_bus_speed;
722 pci_bus_add_devices(zdev->bus);
726 zpci_cleanup_bus_resources(zdev);
727 pci_free_resource_list(&resources);
731 int zpci_enable_device(struct zpci_dev *zdev)
735 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
739 rc = zpci_dma_init_device(zdev);
743 zdev->state = ZPCI_FN_STATE_ONLINE;
747 clp_disable_fh(zdev);
751 EXPORT_SYMBOL_GPL(zpci_enable_device);
753 int zpci_disable_device(struct zpci_dev *zdev)
755 zpci_dma_exit_device(zdev);
756 return clp_disable_fh(zdev);
758 EXPORT_SYMBOL_GPL(zpci_disable_device);
760 int zpci_create_device(struct zpci_dev *zdev)
764 rc = zpci_alloc_domain(zdev);
768 rc = zpci_init_iommu(zdev);
772 mutex_init(&zdev->lock);
773 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
774 rc = zpci_enable_device(zdev);
776 goto out_destroy_iommu;
778 rc = zpci_scan_bus(zdev);
782 spin_lock(&zpci_list_lock);
783 list_add_tail(&zdev->entry, &zpci_list);
784 spin_unlock(&zpci_list_lock);
786 zpci_init_slot(zdev);
791 if (zdev->state == ZPCI_FN_STATE_ONLINE)
792 zpci_disable_device(zdev);
794 zpci_destroy_iommu(zdev);
796 zpci_free_domain(zdev);
801 void zpci_remove_device(struct zpci_dev *zdev)
806 pci_stop_root_bus(zdev->bus);
807 pci_remove_root_bus(zdev->bus);
810 int zpci_report_error(struct pci_dev *pdev,
811 struct zpci_report_error_header *report)
813 struct zpci_dev *zdev = to_zpci(pdev);
815 return sclp_pci_report(report, zdev->fh, zdev->fid);
817 EXPORT_SYMBOL(zpci_report_error);
819 static int zpci_mem_init(void)
821 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
822 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
824 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
825 __alignof__(struct zpci_fmb), 0, NULL);
829 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
830 sizeof(*zpci_iomap_start), GFP_KERNEL);
831 if (!zpci_iomap_start)
834 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
835 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
836 if (!zpci_iomap_bitmap)
837 goto error_iomap_bitmap;
841 kfree(zpci_iomap_start);
843 kmem_cache_destroy(zdev_fmb_cache);
848 static void zpci_mem_exit(void)
850 kfree(zpci_iomap_bitmap);
851 kfree(zpci_iomap_start);
852 kmem_cache_destroy(zdev_fmb_cache);
855 static unsigned int s390_pci_probe __initdata = 1;
856 static unsigned int s390_pci_no_mio __initdata;
857 unsigned int s390_pci_force_floating __initdata;
858 static unsigned int s390_pci_initialized;
860 char * __init pcibios_setup(char *str)
862 if (!strcmp(str, "off")) {
866 if (!strcmp(str, "nomio")) {
870 if (!strcmp(str, "force_floating")) {
871 s390_pci_force_floating = 1;
877 bool zpci_is_enabled(void)
879 return s390_pci_initialized;
882 static int __init pci_base_init(void)
889 if (!test_facility(69) || !test_facility(71))
892 if (test_facility(153) && !s390_pci_no_mio)
893 static_branch_enable(&have_mio);
895 rc = zpci_debug_init();
899 rc = zpci_mem_init();
903 rc = zpci_irq_init();
907 rc = zpci_dma_init();
911 rc = clp_scan_pci_devices();
915 s390_pci_initialized = 1;
929 subsys_initcall_sync(pci_base_init);
931 void zpci_rescan(void)
933 if (zpci_is_enabled())
934 clp_rescan_pci_devices_simple();