1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright IBM Corp. 2012
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>
30 #include <linux/printk.h>
34 #include <asm/facility.h>
35 #include <asm/pci_insn.h>
36 #include <asm/pci_clp.h>
37 #include <asm/pci_dma.h>
42 /* list of all detected zpci devices */
43 static LIST_HEAD(zpci_list);
44 static DEFINE_SPINLOCK(zpci_list_lock);
46 static DECLARE_BITMAP(zpci_domain, ZPCI_DOMAIN_BITMAP_SIZE);
47 static DEFINE_SPINLOCK(zpci_domain_lock);
49 #define ZPCI_IOMAP_ENTRIES \
50 min(((unsigned long) ZPCI_NR_DEVICES * PCI_STD_NUM_BARS / 2), \
51 ZPCI_IOMAP_MAX_ENTRIES)
53 unsigned int s390_pci_no_rid;
55 static DEFINE_SPINLOCK(zpci_iomap_lock);
56 static unsigned long *zpci_iomap_bitmap;
57 struct zpci_iomap_entry *zpci_iomap_start;
58 EXPORT_SYMBOL_GPL(zpci_iomap_start);
60 DEFINE_STATIC_KEY_FALSE(have_mio);
62 static struct kmem_cache *zdev_fmb_cache;
64 struct zpci_dev *get_zdev_by_fid(u32 fid)
66 struct zpci_dev *tmp, *zdev = NULL;
68 spin_lock(&zpci_list_lock);
69 list_for_each_entry(tmp, &zpci_list, entry) {
70 if (tmp->fid == fid) {
75 spin_unlock(&zpci_list_lock);
79 void zpci_remove_reserved_devices(void)
81 struct zpci_dev *tmp, *zdev;
82 enum zpci_state state;
85 spin_lock(&zpci_list_lock);
86 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
87 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
88 !clp_get_state(zdev->fid, &state) &&
89 state == ZPCI_FN_STATE_RESERVED)
90 list_move_tail(&zdev->entry, &remove);
92 spin_unlock(&zpci_list_lock);
94 list_for_each_entry_safe(zdev, tmp, &remove, entry)
98 int pci_domain_nr(struct pci_bus *bus)
100 return ((struct zpci_bus *) bus->sysdata)->domain_nr;
102 EXPORT_SYMBOL_GPL(pci_domain_nr);
104 int pci_proc_domain(struct pci_bus *bus)
106 return pci_domain_nr(bus);
108 EXPORT_SYMBOL_GPL(pci_proc_domain);
110 /* Modify PCI: Register I/O address translation parameters */
111 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
112 u64 base, u64 limit, u64 iota)
114 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
115 struct zpci_fib fib = {0};
118 WARN_ON_ONCE(iota & 0x3fff);
121 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
122 return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
125 /* Modify PCI: Unregister I/O address translation parameters */
126 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
128 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
129 struct zpci_fib fib = {0};
132 cc = zpci_mod_fc(req, &fib, &status);
133 if (cc == 3) /* Function already gone. */
135 return cc ? -EIO : 0;
138 /* Modify PCI: Set PCI function measurement parameters */
139 int zpci_fmb_enable_device(struct zpci_dev *zdev)
141 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
142 struct zpci_fib fib = {0};
145 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
148 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
151 WARN_ON((u64) zdev->fmb & 0xf);
153 /* reset software counters */
154 atomic64_set(&zdev->allocated_pages, 0);
155 atomic64_set(&zdev->mapped_pages, 0);
156 atomic64_set(&zdev->unmapped_pages, 0);
158 fib.fmb_addr = virt_to_phys(zdev->fmb);
159 cc = zpci_mod_fc(req, &fib, &status);
161 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
164 return cc ? -EIO : 0;
167 /* Modify PCI: Disable PCI function measurement */
168 int zpci_fmb_disable_device(struct zpci_dev *zdev)
170 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
171 struct zpci_fib fib = {0};
177 /* Function measurement is disabled if fmb address is zero */
178 cc = zpci_mod_fc(req, &fib, &status);
179 if (cc == 3) /* Function already gone. */
183 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
186 return cc ? -EIO : 0;
189 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
191 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
195 rc = __zpci_load(&data, req, offset);
197 data = le64_to_cpu((__force __le64) data);
198 data >>= (8 - len) * 8;
205 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
207 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
211 data <<= (8 - len) * 8;
212 data = (__force u64) cpu_to_le64(data);
213 rc = __zpci_store(data, req, offset);
217 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
218 resource_size_t size,
219 resource_size_t align)
224 /* combine single writes by using store-block insn */
225 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
227 zpci_memcpy_toio(to, from, count);
230 static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot)
232 unsigned long offset, vaddr;
233 struct vm_struct *area;
234 phys_addr_t last_addr;
236 last_addr = addr + size - 1;
237 if (!size || last_addr < addr)
240 if (!static_branch_unlikely(&have_mio))
241 return (void __iomem *) addr;
243 offset = addr & ~PAGE_MASK;
245 size = PAGE_ALIGN(size + offset);
246 area = get_vm_area(size, VM_IOREMAP);
250 vaddr = (unsigned long) area->addr;
251 if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
255 return (void __iomem *) ((unsigned long) area->addr + offset);
258 void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
260 return __ioremap(addr, size, __pgprot(prot));
262 EXPORT_SYMBOL(ioremap_prot);
264 void __iomem *ioremap(phys_addr_t addr, size_t size)
266 return __ioremap(addr, size, PAGE_KERNEL);
268 EXPORT_SYMBOL(ioremap);
270 void __iomem *ioremap_wc(phys_addr_t addr, size_t size)
272 return __ioremap(addr, size, pgprot_writecombine(PAGE_KERNEL));
274 EXPORT_SYMBOL(ioremap_wc);
276 void __iomem *ioremap_wt(phys_addr_t addr, size_t size)
278 return __ioremap(addr, size, pgprot_writethrough(PAGE_KERNEL));
280 EXPORT_SYMBOL(ioremap_wt);
282 void iounmap(volatile void __iomem *addr)
284 if (static_branch_likely(&have_mio))
285 vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
287 EXPORT_SYMBOL(iounmap);
289 /* Create a virtual mapping cookie for a PCI BAR */
290 static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
291 unsigned long offset, unsigned long max)
293 struct zpci_dev *zdev = to_zpci(pdev);
296 idx = zdev->bars[bar].map_idx;
297 spin_lock(&zpci_iomap_lock);
299 WARN_ON(!++zpci_iomap_start[idx].count);
300 zpci_iomap_start[idx].fh = zdev->fh;
301 zpci_iomap_start[idx].bar = bar;
302 spin_unlock(&zpci_iomap_lock);
304 return (void __iomem *) ZPCI_ADDR(idx) + offset;
307 static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
308 unsigned long offset,
311 unsigned long barsize = pci_resource_len(pdev, bar);
312 struct zpci_dev *zdev = to_zpci(pdev);
315 iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
316 return iova ? iova + offset : iova;
319 void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
320 unsigned long offset, unsigned long max)
322 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
325 if (static_branch_likely(&have_mio))
326 return pci_iomap_range_mio(pdev, bar, offset, max);
328 return pci_iomap_range_fh(pdev, bar, offset, max);
330 EXPORT_SYMBOL(pci_iomap_range);
332 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
334 return pci_iomap_range(dev, bar, 0, maxlen);
336 EXPORT_SYMBOL(pci_iomap);
338 static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
339 unsigned long offset, unsigned long max)
341 unsigned long barsize = pci_resource_len(pdev, bar);
342 struct zpci_dev *zdev = to_zpci(pdev);
345 iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
346 return iova ? iova + offset : iova;
349 void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
350 unsigned long offset, unsigned long max)
352 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
355 if (static_branch_likely(&have_mio))
356 return pci_iomap_wc_range_mio(pdev, bar, offset, max);
358 return pci_iomap_range_fh(pdev, bar, offset, max);
360 EXPORT_SYMBOL(pci_iomap_wc_range);
362 void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
364 return pci_iomap_wc_range(dev, bar, 0, maxlen);
366 EXPORT_SYMBOL(pci_iomap_wc);
368 static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
370 unsigned int idx = ZPCI_IDX(addr);
372 spin_lock(&zpci_iomap_lock);
373 /* Detect underrun */
374 WARN_ON(!zpci_iomap_start[idx].count);
375 if (!--zpci_iomap_start[idx].count) {
376 zpci_iomap_start[idx].fh = 0;
377 zpci_iomap_start[idx].bar = 0;
379 spin_unlock(&zpci_iomap_lock);
382 static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
387 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
389 if (static_branch_likely(&have_mio))
390 pci_iounmap_mio(pdev, addr);
392 pci_iounmap_fh(pdev, addr);
394 EXPORT_SYMBOL(pci_iounmap);
396 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
399 struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
401 return (zdev) ? zpci_cfg_load(zdev, where, val, size) : -ENODEV;
404 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
407 struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
409 return (zdev) ? zpci_cfg_store(zdev, where, val, size) : -ENODEV;
412 static struct pci_ops pci_root_ops = {
417 static void zpci_map_resources(struct pci_dev *pdev)
419 struct zpci_dev *zdev = to_zpci(pdev);
423 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
424 len = pci_resource_len(pdev, i);
428 if (zpci_use_mio(zdev))
429 pdev->resource[i].start =
430 (resource_size_t __force) zdev->bars[i].mio_wt;
432 pdev->resource[i].start = (resource_size_t __force)
433 pci_iomap_range_fh(pdev, i, 0, 0);
434 pdev->resource[i].end = pdev->resource[i].start + len - 1;
437 zpci_iov_map_resources(pdev);
440 static void zpci_unmap_resources(struct pci_dev *pdev)
442 struct zpci_dev *zdev = to_zpci(pdev);
446 if (zpci_use_mio(zdev))
449 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
450 len = pci_resource_len(pdev, i);
453 pci_iounmap_fh(pdev, (void __iomem __force *)
454 pdev->resource[i].start);
458 static int zpci_alloc_iomap(struct zpci_dev *zdev)
462 spin_lock(&zpci_iomap_lock);
463 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
464 if (entry == ZPCI_IOMAP_ENTRIES) {
465 spin_unlock(&zpci_iomap_lock);
468 set_bit(entry, zpci_iomap_bitmap);
469 spin_unlock(&zpci_iomap_lock);
473 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
475 spin_lock(&zpci_iomap_lock);
476 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
477 clear_bit(entry, zpci_iomap_bitmap);
478 spin_unlock(&zpci_iomap_lock);
481 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
482 unsigned long size, unsigned long flags)
486 r = kzalloc(sizeof(*r), GFP_KERNEL);
491 r->end = r->start + size - 1;
493 r->name = zdev->res_name;
495 if (request_resource(&iomem_resource, r)) {
502 int zpci_setup_bus_resources(struct zpci_dev *zdev,
503 struct list_head *resources)
505 unsigned long addr, size, flags;
506 struct resource *res;
509 snprintf(zdev->res_name, sizeof(zdev->res_name),
510 "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR);
512 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
513 if (!zdev->bars[i].size)
515 entry = zpci_alloc_iomap(zdev);
518 zdev->bars[i].map_idx = entry;
520 /* only MMIO is supported */
521 flags = IORESOURCE_MEM;
522 if (zdev->bars[i].val & 8)
523 flags |= IORESOURCE_PREFETCH;
524 if (zdev->bars[i].val & 4)
525 flags |= IORESOURCE_MEM_64;
527 if (zpci_use_mio(zdev))
528 addr = (unsigned long) zdev->bars[i].mio_wt;
530 addr = ZPCI_ADDR(entry);
531 size = 1UL << zdev->bars[i].size;
533 res = __alloc_res(zdev, addr, size, flags);
535 zpci_free_iomap(zdev, entry);
538 zdev->bars[i].res = res;
539 pci_add_resource(resources, res);
541 zdev->has_resources = 1;
546 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
550 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
551 if (!zdev->bars[i].size || !zdev->bars[i].res)
554 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
555 release_resource(zdev->bars[i].res);
556 kfree(zdev->bars[i].res);
558 zdev->has_resources = 0;
561 int pcibios_add_device(struct pci_dev *pdev)
563 struct resource *res;
567 pdev->no_vf_scan = 1;
569 pdev->dev.groups = zpci_attr_groups;
570 pdev->dev.dma_ops = &s390_pci_dma_ops;
571 zpci_map_resources(pdev);
573 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
574 res = &pdev->resource[i];
575 if (res->parent || !res->flags)
577 pci_claim_resource(pdev, i);
583 void pcibios_release_device(struct pci_dev *pdev)
585 zpci_unmap_resources(pdev);
588 int pcibios_enable_device(struct pci_dev *pdev, int mask)
590 struct zpci_dev *zdev = to_zpci(pdev);
592 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
593 zpci_fmb_enable_device(zdev);
595 return pci_enable_resources(pdev, mask);
598 void pcibios_disable_device(struct pci_dev *pdev)
600 struct zpci_dev *zdev = to_zpci(pdev);
602 zpci_fmb_disable_device(zdev);
603 zpci_debug_exit_device(zdev);
606 static int __zpci_register_domain(int domain)
608 spin_lock(&zpci_domain_lock);
609 if (test_bit(domain, zpci_domain)) {
610 spin_unlock(&zpci_domain_lock);
611 pr_err("Domain %04x is already assigned\n", domain);
614 set_bit(domain, zpci_domain);
615 spin_unlock(&zpci_domain_lock);
619 static int __zpci_alloc_domain(void)
623 spin_lock(&zpci_domain_lock);
625 * We can always auto allocate domains below ZPCI_NR_DEVICES.
626 * There is either a free domain or we have reached the maximum in
627 * which case we would have bailed earlier.
629 domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
630 set_bit(domain, zpci_domain);
631 spin_unlock(&zpci_domain_lock);
635 int zpci_alloc_domain(int domain)
637 if (zpci_unique_uid) {
639 return __zpci_register_domain(domain);
640 pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n");
641 update_uid_checking(false);
643 return __zpci_alloc_domain();
646 void zpci_free_domain(int domain)
648 spin_lock(&zpci_domain_lock);
649 clear_bit(domain, zpci_domain);
650 spin_unlock(&zpci_domain_lock);
654 int zpci_enable_device(struct zpci_dev *zdev)
658 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
662 rc = zpci_dma_init_device(zdev);
669 clp_disable_fh(zdev);
674 int zpci_disable_device(struct zpci_dev *zdev)
676 zpci_dma_exit_device(zdev);
678 * The zPCI function may already be disabled by the platform, this is
679 * detected in clp_disable_fh() which becomes a no-op.
681 return clp_disable_fh(zdev);
685 * zpci_create_device() - Create a new zpci_dev and add it to the zbus
686 * @fid: Function ID of the device to be created
687 * @fh: Current Function Handle of the device to be created
688 * @state: Initial state after creation either Standby or Configured
690 * Creates a new zpci device and adds it to its, possibly newly created, zbus
691 * as well as zpci_list.
693 * Returns: the zdev on success or an error pointer otherwise
695 struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state)
697 struct zpci_dev *zdev;
700 zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, state);
701 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
703 return ERR_PTR(-ENOMEM);
705 /* FID and Function Handle are the static/dynamic identifiers */
709 /* Query function properties and update zdev */
710 rc = clp_query_pci_fn(zdev);
715 kref_init(&zdev->kref);
716 mutex_init(&zdev->lock);
718 rc = zpci_init_iommu(zdev);
722 rc = zpci_bus_device_register(zdev, &pci_root_ops);
724 goto error_destroy_iommu;
726 spin_lock(&zpci_list_lock);
727 list_add_tail(&zdev->entry, &zpci_list);
728 spin_unlock(&zpci_list_lock);
733 zpci_destroy_iommu(zdev);
735 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
741 * zpci_scan_configured_device() - Scan a freshly configured zpci_dev
742 * @zdev: The zpci_dev to be configured
743 * @fh: The general function handle supplied by the platform
745 * Given a device in the configuration state Configured, enables, scans and
746 * adds it to the common code PCI subsystem if possible. If the PCI device is
747 * parked because we can not yet create a PCI bus because we have not seen
748 * function 0, it is ignored but will be scanned once function 0 appears.
749 * If any failure occurs, the zpci_dev is left disabled.
751 * Return: 0 on success, or an error code otherwise
753 int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh)
758 /* the PCI function will be scanned once function 0 appears */
759 if (!zdev->zbus->bus)
762 /* For function 0 on a multi-function bus scan whole bus as we might
763 * have to pick up existing functions waiting for it to allow creating
766 if (zdev->devfn == 0 && zdev->zbus->multifunction)
767 rc = zpci_bus_scan_bus(zdev->zbus);
769 rc = zpci_bus_scan_device(zdev);
775 * zpci_deconfigure_device() - Deconfigure a zpci_dev
776 * @zdev: The zpci_dev to configure
778 * Deconfigure a zPCI function that is currently configured and possibly known
779 * to the common code PCI subsystem.
780 * If any failure occurs the device is left as is.
782 * Return: 0 on success, or an error code otherwise
784 int zpci_deconfigure_device(struct zpci_dev *zdev)
789 zpci_bus_remove_device(zdev, false);
791 if (zdev_enabled(zdev)) {
792 rc = zpci_disable_device(zdev);
797 rc = sclp_pci_deconfigure(zdev->fid);
798 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, rc);
801 zdev->state = ZPCI_FN_STATE_STANDBY;
806 void zpci_release_device(struct kref *kref)
808 struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref);
812 zpci_bus_remove_device(zdev, false);
814 if (zdev_enabled(zdev))
815 zpci_disable_device(zdev);
817 switch (zdev->state) {
818 case ZPCI_FN_STATE_CONFIGURED:
819 ret = sclp_pci_deconfigure(zdev->fid);
820 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
822 case ZPCI_FN_STATE_STANDBY:
823 if (zdev->has_hp_slot)
824 zpci_exit_slot(zdev);
825 zpci_cleanup_bus_resources(zdev);
826 zpci_bus_device_unregister(zdev);
827 zpci_destroy_iommu(zdev);
833 spin_lock(&zpci_list_lock);
834 list_del(&zdev->entry);
835 spin_unlock(&zpci_list_lock);
836 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
840 int zpci_report_error(struct pci_dev *pdev,
841 struct zpci_report_error_header *report)
843 struct zpci_dev *zdev = to_zpci(pdev);
845 return sclp_pci_report(report, zdev->fh, zdev->fid);
847 EXPORT_SYMBOL(zpci_report_error);
849 static int zpci_mem_init(void)
851 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
852 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
854 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
855 __alignof__(struct zpci_fmb), 0, NULL);
859 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
860 sizeof(*zpci_iomap_start), GFP_KERNEL);
861 if (!zpci_iomap_start)
864 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
865 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
866 if (!zpci_iomap_bitmap)
867 goto error_iomap_bitmap;
869 if (static_branch_likely(&have_mio))
870 clp_setup_writeback_mio();
874 kfree(zpci_iomap_start);
876 kmem_cache_destroy(zdev_fmb_cache);
881 static void zpci_mem_exit(void)
883 kfree(zpci_iomap_bitmap);
884 kfree(zpci_iomap_start);
885 kmem_cache_destroy(zdev_fmb_cache);
888 static unsigned int s390_pci_probe __initdata = 1;
889 static unsigned int s390_pci_no_mio __initdata;
890 unsigned int s390_pci_force_floating __initdata;
891 static unsigned int s390_pci_initialized;
893 char * __init pcibios_setup(char *str)
895 if (!strcmp(str, "off")) {
899 if (!strcmp(str, "nomio")) {
903 if (!strcmp(str, "force_floating")) {
904 s390_pci_force_floating = 1;
907 if (!strcmp(str, "norid")) {
914 bool zpci_is_enabled(void)
916 return s390_pci_initialized;
919 static int __init pci_base_init(void)
926 if (!test_facility(69) || !test_facility(71)) {
927 pr_info("PCI is not supported because CPU facilities 69 or 71 are not available\n");
931 if (test_facility(153) && !s390_pci_no_mio) {
932 static_branch_enable(&have_mio);
936 rc = zpci_debug_init();
940 rc = zpci_mem_init();
944 rc = zpci_irq_init();
948 rc = zpci_dma_init();
952 rc = clp_scan_pci_devices();
955 zpci_bus_scan_busses();
957 s390_pci_initialized = 1;
971 subsys_initcall_sync(pci_base_init);