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>
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)
95 zpci_device_reserved(zdev);
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 cc = zpci_mod_fc(req, &fib, &status);
124 zpci_dbg(3, "reg ioat fid:%x, cc:%d, status:%d\n", zdev->fid, cc, status);
128 /* Modify PCI: Unregister I/O address translation parameters */
129 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
131 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
132 struct zpci_fib fib = {0};
135 cc = zpci_mod_fc(req, &fib, &status);
137 zpci_dbg(3, "unreg ioat fid:%x, cc:%d, status:%d\n", zdev->fid, cc, status);
141 /* Modify PCI: Set PCI function measurement parameters */
142 int zpci_fmb_enable_device(struct zpci_dev *zdev)
144 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
145 struct zpci_fib fib = {0};
148 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
151 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
154 WARN_ON((u64) zdev->fmb & 0xf);
156 /* reset software counters */
157 atomic64_set(&zdev->allocated_pages, 0);
158 atomic64_set(&zdev->mapped_pages, 0);
159 atomic64_set(&zdev->unmapped_pages, 0);
161 fib.fmb_addr = virt_to_phys(zdev->fmb);
162 cc = zpci_mod_fc(req, &fib, &status);
164 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
167 return cc ? -EIO : 0;
170 /* Modify PCI: Disable PCI function measurement */
171 int zpci_fmb_disable_device(struct zpci_dev *zdev)
173 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
174 struct zpci_fib fib = {0};
180 /* Function measurement is disabled if fmb address is zero */
181 cc = zpci_mod_fc(req, &fib, &status);
182 if (cc == 3) /* Function already gone. */
186 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
189 return cc ? -EIO : 0;
192 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
194 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
198 rc = __zpci_load(&data, req, offset);
200 data = le64_to_cpu((__force __le64) data);
201 data >>= (8 - len) * 8;
208 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
210 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
214 data <<= (8 - len) * 8;
215 data = (__force u64) cpu_to_le64(data);
216 rc = __zpci_store(data, req, offset);
220 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
221 resource_size_t size,
222 resource_size_t align)
227 /* combine single writes by using store-block insn */
228 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
230 zpci_memcpy_toio(to, from, count);
233 static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot)
235 unsigned long offset, vaddr;
236 struct vm_struct *area;
237 phys_addr_t last_addr;
239 last_addr = addr + size - 1;
240 if (!size || last_addr < addr)
243 if (!static_branch_unlikely(&have_mio))
244 return (void __iomem *) addr;
246 offset = addr & ~PAGE_MASK;
248 size = PAGE_ALIGN(size + offset);
249 area = get_vm_area(size, VM_IOREMAP);
253 vaddr = (unsigned long) area->addr;
254 if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
258 return (void __iomem *) ((unsigned long) area->addr + offset);
261 void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
263 return __ioremap(addr, size, __pgprot(prot));
265 EXPORT_SYMBOL(ioremap_prot);
267 void __iomem *ioremap(phys_addr_t addr, size_t size)
269 return __ioremap(addr, size, PAGE_KERNEL);
271 EXPORT_SYMBOL(ioremap);
273 void __iomem *ioremap_wc(phys_addr_t addr, size_t size)
275 return __ioremap(addr, size, pgprot_writecombine(PAGE_KERNEL));
277 EXPORT_SYMBOL(ioremap_wc);
279 void __iomem *ioremap_wt(phys_addr_t addr, size_t size)
281 return __ioremap(addr, size, pgprot_writethrough(PAGE_KERNEL));
283 EXPORT_SYMBOL(ioremap_wt);
285 void iounmap(volatile void __iomem *addr)
287 if (static_branch_likely(&have_mio))
288 vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
290 EXPORT_SYMBOL(iounmap);
292 /* Create a virtual mapping cookie for a PCI BAR */
293 static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
294 unsigned long offset, unsigned long max)
296 struct zpci_dev *zdev = to_zpci(pdev);
299 idx = zdev->bars[bar].map_idx;
300 spin_lock(&zpci_iomap_lock);
302 WARN_ON(!++zpci_iomap_start[idx].count);
303 zpci_iomap_start[idx].fh = zdev->fh;
304 zpci_iomap_start[idx].bar = bar;
305 spin_unlock(&zpci_iomap_lock);
307 return (void __iomem *) ZPCI_ADDR(idx) + offset;
310 static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
311 unsigned long offset,
314 unsigned long barsize = pci_resource_len(pdev, bar);
315 struct zpci_dev *zdev = to_zpci(pdev);
318 iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
319 return iova ? iova + offset : iova;
322 void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
323 unsigned long offset, unsigned long max)
325 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
328 if (static_branch_likely(&have_mio))
329 return pci_iomap_range_mio(pdev, bar, offset, max);
331 return pci_iomap_range_fh(pdev, bar, offset, max);
333 EXPORT_SYMBOL(pci_iomap_range);
335 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
337 return pci_iomap_range(dev, bar, 0, maxlen);
339 EXPORT_SYMBOL(pci_iomap);
341 static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
342 unsigned long offset, unsigned long max)
344 unsigned long barsize = pci_resource_len(pdev, bar);
345 struct zpci_dev *zdev = to_zpci(pdev);
348 iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
349 return iova ? iova + offset : iova;
352 void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
353 unsigned long offset, unsigned long max)
355 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
358 if (static_branch_likely(&have_mio))
359 return pci_iomap_wc_range_mio(pdev, bar, offset, max);
361 return pci_iomap_range_fh(pdev, bar, offset, max);
363 EXPORT_SYMBOL(pci_iomap_wc_range);
365 void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
367 return pci_iomap_wc_range(dev, bar, 0, maxlen);
369 EXPORT_SYMBOL(pci_iomap_wc);
371 static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
373 unsigned int idx = ZPCI_IDX(addr);
375 spin_lock(&zpci_iomap_lock);
376 /* Detect underrun */
377 WARN_ON(!zpci_iomap_start[idx].count);
378 if (!--zpci_iomap_start[idx].count) {
379 zpci_iomap_start[idx].fh = 0;
380 zpci_iomap_start[idx].bar = 0;
382 spin_unlock(&zpci_iomap_lock);
385 static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
390 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
392 if (static_branch_likely(&have_mio))
393 pci_iounmap_mio(pdev, addr);
395 pci_iounmap_fh(pdev, addr);
397 EXPORT_SYMBOL(pci_iounmap);
399 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
402 struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
404 return (zdev) ? zpci_cfg_load(zdev, where, val, size) : -ENODEV;
407 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
410 struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
412 return (zdev) ? zpci_cfg_store(zdev, where, val, size) : -ENODEV;
415 static struct pci_ops pci_root_ops = {
420 static void zpci_map_resources(struct pci_dev *pdev)
422 struct zpci_dev *zdev = to_zpci(pdev);
426 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
427 len = pci_resource_len(pdev, i);
431 if (zpci_use_mio(zdev))
432 pdev->resource[i].start =
433 (resource_size_t __force) zdev->bars[i].mio_wt;
435 pdev->resource[i].start = (resource_size_t __force)
436 pci_iomap_range_fh(pdev, i, 0, 0);
437 pdev->resource[i].end = pdev->resource[i].start + len - 1;
440 zpci_iov_map_resources(pdev);
443 static void zpci_unmap_resources(struct pci_dev *pdev)
445 struct zpci_dev *zdev = to_zpci(pdev);
449 if (zpci_use_mio(zdev))
452 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
453 len = pci_resource_len(pdev, i);
456 pci_iounmap_fh(pdev, (void __iomem __force *)
457 pdev->resource[i].start);
461 static int zpci_alloc_iomap(struct zpci_dev *zdev)
465 spin_lock(&zpci_iomap_lock);
466 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
467 if (entry == ZPCI_IOMAP_ENTRIES) {
468 spin_unlock(&zpci_iomap_lock);
471 set_bit(entry, zpci_iomap_bitmap);
472 spin_unlock(&zpci_iomap_lock);
476 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
478 spin_lock(&zpci_iomap_lock);
479 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
480 clear_bit(entry, zpci_iomap_bitmap);
481 spin_unlock(&zpci_iomap_lock);
484 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
485 unsigned long size, unsigned long flags)
489 r = kzalloc(sizeof(*r), GFP_KERNEL);
494 r->end = r->start + size - 1;
496 r->name = zdev->res_name;
498 if (request_resource(&iomem_resource, r)) {
505 int zpci_setup_bus_resources(struct zpci_dev *zdev,
506 struct list_head *resources)
508 unsigned long addr, size, flags;
509 struct resource *res;
512 snprintf(zdev->res_name, sizeof(zdev->res_name),
513 "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR);
515 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
516 if (!zdev->bars[i].size)
518 entry = zpci_alloc_iomap(zdev);
521 zdev->bars[i].map_idx = entry;
523 /* only MMIO is supported */
524 flags = IORESOURCE_MEM;
525 if (zdev->bars[i].val & 8)
526 flags |= IORESOURCE_PREFETCH;
527 if (zdev->bars[i].val & 4)
528 flags |= IORESOURCE_MEM_64;
530 if (zpci_use_mio(zdev))
531 addr = (unsigned long) zdev->bars[i].mio_wt;
533 addr = ZPCI_ADDR(entry);
534 size = 1UL << zdev->bars[i].size;
536 res = __alloc_res(zdev, addr, size, flags);
538 zpci_free_iomap(zdev, entry);
541 zdev->bars[i].res = res;
542 pci_add_resource(resources, res);
544 zdev->has_resources = 1;
549 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
553 for (i = 0; i < PCI_STD_NUM_BARS; 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);
561 zdev->has_resources = 0;
564 int pcibios_add_device(struct pci_dev *pdev)
566 struct zpci_dev *zdev = to_zpci(pdev);
567 struct resource *res;
570 /* The pdev has a reference to the zdev via its bus */
573 pdev->no_vf_scan = 1;
575 pdev->dev.groups = zpci_attr_groups;
576 pdev->dev.dma_ops = &s390_pci_dma_ops;
577 zpci_map_resources(pdev);
579 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
580 res = &pdev->resource[i];
581 if (res->parent || !res->flags)
583 pci_claim_resource(pdev, i);
589 void pcibios_release_device(struct pci_dev *pdev)
591 struct zpci_dev *zdev = to_zpci(pdev);
593 zpci_unmap_resources(pdev);
597 int pcibios_enable_device(struct pci_dev *pdev, int mask)
599 struct zpci_dev *zdev = to_zpci(pdev);
601 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
602 zpci_fmb_enable_device(zdev);
604 return pci_enable_resources(pdev, mask);
607 void pcibios_disable_device(struct pci_dev *pdev)
609 struct zpci_dev *zdev = to_zpci(pdev);
611 zpci_fmb_disable_device(zdev);
612 zpci_debug_exit_device(zdev);
615 static int __zpci_register_domain(int domain)
617 spin_lock(&zpci_domain_lock);
618 if (test_bit(domain, zpci_domain)) {
619 spin_unlock(&zpci_domain_lock);
620 pr_err("Domain %04x is already assigned\n", domain);
623 set_bit(domain, zpci_domain);
624 spin_unlock(&zpci_domain_lock);
628 static int __zpci_alloc_domain(void)
632 spin_lock(&zpci_domain_lock);
634 * We can always auto allocate domains below ZPCI_NR_DEVICES.
635 * There is either a free domain or we have reached the maximum in
636 * which case we would have bailed earlier.
638 domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
639 set_bit(domain, zpci_domain);
640 spin_unlock(&zpci_domain_lock);
644 int zpci_alloc_domain(int domain)
646 if (zpci_unique_uid) {
648 return __zpci_register_domain(domain);
649 pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n");
650 update_uid_checking(false);
652 return __zpci_alloc_domain();
655 void zpci_free_domain(int domain)
657 spin_lock(&zpci_domain_lock);
658 clear_bit(domain, zpci_domain);
659 spin_unlock(&zpci_domain_lock);
663 int zpci_enable_device(struct zpci_dev *zdev)
668 if (clp_enable_fh(zdev, &fh, ZPCI_NR_DMA_SPACES))
675 int zpci_disable_device(struct zpci_dev *zdev)
680 cc = clp_disable_fh(zdev, &fh);
683 } else if (cc == CLP_RC_SETPCIFN_ALRDY) {
684 pr_info("Disabling PCI function %08x had no effect as it was already disabled\n",
686 /* Function is already disabled - update handle */
687 rc = clp_refresh_fh(zdev->fid, &fh);
699 * zpci_create_device() - Create a new zpci_dev and add it to the zbus
700 * @fid: Function ID of the device to be created
701 * @fh: Current Function Handle of the device to be created
702 * @state: Initial state after creation either Standby or Configured
704 * Creates a new zpci device and adds it to its, possibly newly created, zbus
705 * as well as zpci_list.
707 * Returns: the zdev on success or an error pointer otherwise
709 struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state)
711 struct zpci_dev *zdev;
714 zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, state);
715 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
717 return ERR_PTR(-ENOMEM);
719 /* FID and Function Handle are the static/dynamic identifiers */
723 /* Query function properties and update zdev */
724 rc = clp_query_pci_fn(zdev);
729 kref_init(&zdev->kref);
730 mutex_init(&zdev->lock);
732 rc = zpci_init_iommu(zdev);
736 rc = zpci_bus_device_register(zdev, &pci_root_ops);
738 goto error_destroy_iommu;
740 spin_lock(&zpci_list_lock);
741 list_add_tail(&zdev->entry, &zpci_list);
742 spin_unlock(&zpci_list_lock);
747 zpci_destroy_iommu(zdev);
749 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
754 bool zpci_is_device_configured(struct zpci_dev *zdev)
756 enum zpci_state state = zdev->state;
758 return state != ZPCI_FN_STATE_RESERVED &&
759 state != ZPCI_FN_STATE_STANDBY;
763 * zpci_scan_configured_device() - Scan a freshly configured zpci_dev
764 * @zdev: The zpci_dev to be configured
765 * @fh: The general function handle supplied by the platform
767 * Given a device in the configuration state Configured, enables, scans and
768 * adds it to the common code PCI subsystem if possible. If the PCI device is
769 * parked because we can not yet create a PCI bus because we have not seen
770 * function 0, it is ignored but will be scanned once function 0 appears.
771 * If any failure occurs, the zpci_dev is left disabled.
773 * Return: 0 on success, or an error code otherwise
775 int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh)
780 /* the PCI function will be scanned once function 0 appears */
781 if (!zdev->zbus->bus)
784 /* For function 0 on a multi-function bus scan whole bus as we might
785 * have to pick up existing functions waiting for it to allow creating
788 if (zdev->devfn == 0 && zdev->zbus->multifunction)
789 rc = zpci_bus_scan_bus(zdev->zbus);
791 rc = zpci_bus_scan_device(zdev);
797 * zpci_deconfigure_device() - Deconfigure a zpci_dev
798 * @zdev: The zpci_dev to configure
800 * Deconfigure a zPCI function that is currently configured and possibly known
801 * to the common code PCI subsystem.
802 * If any failure occurs the device is left as is.
804 * Return: 0 on success, or an error code otherwise
806 int zpci_deconfigure_device(struct zpci_dev *zdev)
811 zpci_bus_remove_device(zdev, false);
813 if (zdev->dma_table) {
814 rc = zpci_dma_exit_device(zdev);
818 if (zdev_enabled(zdev)) {
819 rc = zpci_disable_device(zdev);
824 rc = sclp_pci_deconfigure(zdev->fid);
825 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, rc);
828 zdev->state = ZPCI_FN_STATE_STANDBY;
834 * zpci_device_reserved() - Mark device as resverved
835 * @zdev: the zpci_dev that was reserved
837 * Handle the case that a given zPCI function was reserved by another system.
838 * After a call to this function the zpci_dev can not be found via
839 * get_zdev_by_fid() anymore but may still be accessible via existing
840 * references though it will not be functional anymore.
842 void zpci_device_reserved(struct zpci_dev *zdev)
844 if (zdev->has_hp_slot)
845 zpci_exit_slot(zdev);
847 * Remove device from zpci_list as it is going away. This also
848 * makes sure we ignore subsequent zPCI events for this device.
850 spin_lock(&zpci_list_lock);
851 list_del(&zdev->entry);
852 spin_unlock(&zpci_list_lock);
853 zdev->state = ZPCI_FN_STATE_RESERVED;
854 zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
858 void zpci_release_device(struct kref *kref)
860 struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref);
864 zpci_bus_remove_device(zdev, false);
867 zpci_dma_exit_device(zdev);
868 if (zdev_enabled(zdev))
869 zpci_disable_device(zdev);
871 switch (zdev->state) {
872 case ZPCI_FN_STATE_CONFIGURED:
873 ret = sclp_pci_deconfigure(zdev->fid);
874 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
876 case ZPCI_FN_STATE_STANDBY:
877 if (zdev->has_hp_slot)
878 zpci_exit_slot(zdev);
879 spin_lock(&zpci_list_lock);
880 list_del(&zdev->entry);
881 spin_unlock(&zpci_list_lock);
882 zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
884 case ZPCI_FN_STATE_RESERVED:
885 if (zdev->has_resources)
886 zpci_cleanup_bus_resources(zdev);
887 zpci_bus_device_unregister(zdev);
888 zpci_destroy_iommu(zdev);
893 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
897 int zpci_report_error(struct pci_dev *pdev,
898 struct zpci_report_error_header *report)
900 struct zpci_dev *zdev = to_zpci(pdev);
902 return sclp_pci_report(report, zdev->fh, zdev->fid);
904 EXPORT_SYMBOL(zpci_report_error);
906 static int zpci_mem_init(void)
908 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
909 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
911 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
912 __alignof__(struct zpci_fmb), 0, NULL);
916 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
917 sizeof(*zpci_iomap_start), GFP_KERNEL);
918 if (!zpci_iomap_start)
921 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
922 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
923 if (!zpci_iomap_bitmap)
924 goto error_iomap_bitmap;
926 if (static_branch_likely(&have_mio))
927 clp_setup_writeback_mio();
931 kfree(zpci_iomap_start);
933 kmem_cache_destroy(zdev_fmb_cache);
938 static void zpci_mem_exit(void)
940 kfree(zpci_iomap_bitmap);
941 kfree(zpci_iomap_start);
942 kmem_cache_destroy(zdev_fmb_cache);
945 static unsigned int s390_pci_probe __initdata = 1;
946 unsigned int s390_pci_force_floating __initdata;
947 static unsigned int s390_pci_initialized;
949 char * __init pcibios_setup(char *str)
951 if (!strcmp(str, "off")) {
955 if (!strcmp(str, "nomio")) {
956 S390_lowcore.machine_flags &= ~MACHINE_FLAG_PCI_MIO;
959 if (!strcmp(str, "force_floating")) {
960 s390_pci_force_floating = 1;
963 if (!strcmp(str, "norid")) {
970 bool zpci_is_enabled(void)
972 return s390_pci_initialized;
975 static int __init pci_base_init(void)
982 if (!test_facility(69) || !test_facility(71)) {
983 pr_info("PCI is not supported because CPU facilities 69 or 71 are not available\n");
987 if (MACHINE_HAS_PCI_MIO) {
988 static_branch_enable(&have_mio);
992 rc = zpci_debug_init();
996 rc = zpci_mem_init();
1000 rc = zpci_irq_init();
1004 rc = zpci_dma_init();
1008 rc = clp_scan_pci_devices();
1011 zpci_bus_scan_busses();
1013 s390_pci_initialized = 1;
1027 subsys_initcall_sync(pci_base_init);