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)
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 void zpci_do_update_iomap_fh(struct zpci_dev *zdev, u32 fh)
488 spin_lock(&zpci_iomap_lock);
489 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
490 if (!zdev->bars[bar].size)
492 idx = zdev->bars[bar].map_idx;
493 if (!zpci_iomap_start[idx].count)
495 WRITE_ONCE(zpci_iomap_start[idx].fh, zdev->fh);
497 spin_unlock(&zpci_iomap_lock);
500 void zpci_update_fh(struct zpci_dev *zdev, u32 fh)
502 if (!fh || zdev->fh == fh)
506 if (zpci_use_mio(zdev))
508 if (zdev->has_resources && zdev_enabled(zdev))
509 zpci_do_update_iomap_fh(zdev, fh);
512 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
513 unsigned long size, unsigned long flags)
517 r = kzalloc(sizeof(*r), GFP_KERNEL);
522 r->end = r->start + size - 1;
524 r->name = zdev->res_name;
526 if (request_resource(&iomem_resource, r)) {
533 int zpci_setup_bus_resources(struct zpci_dev *zdev,
534 struct list_head *resources)
536 unsigned long addr, size, flags;
537 struct resource *res;
540 snprintf(zdev->res_name, sizeof(zdev->res_name),
541 "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR);
543 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
544 if (!zdev->bars[i].size)
546 entry = zpci_alloc_iomap(zdev);
549 zdev->bars[i].map_idx = entry;
551 /* only MMIO is supported */
552 flags = IORESOURCE_MEM;
553 if (zdev->bars[i].val & 8)
554 flags |= IORESOURCE_PREFETCH;
555 if (zdev->bars[i].val & 4)
556 flags |= IORESOURCE_MEM_64;
558 if (zpci_use_mio(zdev))
559 addr = (unsigned long) zdev->bars[i].mio_wt;
561 addr = ZPCI_ADDR(entry);
562 size = 1UL << zdev->bars[i].size;
564 res = __alloc_res(zdev, addr, size, flags);
566 zpci_free_iomap(zdev, entry);
569 zdev->bars[i].res = res;
570 pci_add_resource(resources, res);
572 zdev->has_resources = 1;
577 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
581 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
582 if (!zdev->bars[i].size || !zdev->bars[i].res)
585 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
586 release_resource(zdev->bars[i].res);
587 kfree(zdev->bars[i].res);
589 zdev->has_resources = 0;
592 int pcibios_device_add(struct pci_dev *pdev)
594 struct zpci_dev *zdev = to_zpci(pdev);
595 struct resource *res;
598 /* The pdev has a reference to the zdev via its bus */
601 pdev->no_vf_scan = 1;
603 pdev->dev.groups = zpci_attr_groups;
604 pdev->dev.dma_ops = &s390_pci_dma_ops;
605 zpci_map_resources(pdev);
607 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
608 res = &pdev->resource[i];
609 if (res->parent || !res->flags)
611 pci_claim_resource(pdev, i);
617 void pcibios_release_device(struct pci_dev *pdev)
619 struct zpci_dev *zdev = to_zpci(pdev);
621 zpci_unmap_resources(pdev);
625 int pcibios_enable_device(struct pci_dev *pdev, int mask)
627 struct zpci_dev *zdev = to_zpci(pdev);
629 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
630 zpci_fmb_enable_device(zdev);
632 return pci_enable_resources(pdev, mask);
635 void pcibios_disable_device(struct pci_dev *pdev)
637 struct zpci_dev *zdev = to_zpci(pdev);
639 zpci_fmb_disable_device(zdev);
640 zpci_debug_exit_device(zdev);
643 static int __zpci_register_domain(int domain)
645 spin_lock(&zpci_domain_lock);
646 if (test_bit(domain, zpci_domain)) {
647 spin_unlock(&zpci_domain_lock);
648 pr_err("Domain %04x is already assigned\n", domain);
651 set_bit(domain, zpci_domain);
652 spin_unlock(&zpci_domain_lock);
656 static int __zpci_alloc_domain(void)
660 spin_lock(&zpci_domain_lock);
662 * We can always auto allocate domains below ZPCI_NR_DEVICES.
663 * There is either a free domain or we have reached the maximum in
664 * which case we would have bailed earlier.
666 domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
667 set_bit(domain, zpci_domain);
668 spin_unlock(&zpci_domain_lock);
672 int zpci_alloc_domain(int domain)
674 if (zpci_unique_uid) {
676 return __zpci_register_domain(domain);
677 pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n");
678 update_uid_checking(false);
680 return __zpci_alloc_domain();
683 void zpci_free_domain(int domain)
685 spin_lock(&zpci_domain_lock);
686 clear_bit(domain, zpci_domain);
687 spin_unlock(&zpci_domain_lock);
691 int zpci_enable_device(struct zpci_dev *zdev)
696 if (clp_enable_fh(zdev, &fh, ZPCI_NR_DMA_SPACES))
699 zpci_update_fh(zdev, fh);
703 int zpci_disable_device(struct zpci_dev *zdev)
708 cc = clp_disable_fh(zdev, &fh);
710 zpci_update_fh(zdev, fh);
711 } else if (cc == CLP_RC_SETPCIFN_ALRDY) {
712 pr_info("Disabling PCI function %08x had no effect as it was already disabled\n",
714 /* Function is already disabled - update handle */
715 rc = clp_refresh_fh(zdev->fid, &fh);
717 zpci_update_fh(zdev, fh);
727 * zpci_hot_reset_device - perform a reset of the given zPCI function
728 * @zdev: the slot which should be reset
730 * Performs a low level reset of the zPCI function. The reset is low level in
731 * the sense that the zPCI function can be reset without detaching it from the
732 * common PCI subsystem. The reset may be performed while under control of
733 * either DMA or IOMMU APIs in which case the existing DMA/IOMMU translation
734 * table is reinstated at the end of the reset.
736 * After the reset the functions internal state is reset to an initial state
737 * equivalent to its state during boot when first probing a driver.
738 * Consequently after reset the PCI function requires re-initialization via the
739 * common PCI code including re-enabling IRQs via pci_alloc_irq_vectors()
740 * and enabling the function via e.g.pci_enablde_device_flags().The caller
741 * must guard against concurrent reset attempts.
743 * In most cases this function should not be called directly but through
744 * pci_reset_function() or pci_reset_bus() which handle the save/restore and
747 * Return: 0 on success and an error value otherwise
749 int zpci_hot_reset_device(struct zpci_dev *zdev)
753 zpci_dbg(3, "rst fid:%x, fh:%x\n", zdev->fid, zdev->fh);
754 if (zdev_enabled(zdev)) {
755 /* Disables device access, DMAs and IRQs (reset state) */
756 rc = zpci_disable_device(zdev);
758 * Due to a z/VM vs LPAR inconsistency in the error state the
759 * FH may indicate an enabled device but disable says the
760 * device is already disabled don't treat it as an error here.
768 rc = zpci_enable_device(zdev);
773 rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
774 (u64)zdev->dma_table);
776 rc = zpci_dma_init_device(zdev);
778 zpci_disable_device(zdev);
786 * zpci_create_device() - Create a new zpci_dev and add it to the zbus
787 * @fid: Function ID of the device to be created
788 * @fh: Current Function Handle of the device to be created
789 * @state: Initial state after creation either Standby or Configured
791 * Creates a new zpci device and adds it to its, possibly newly created, zbus
792 * as well as zpci_list.
794 * Returns: the zdev on success or an error pointer otherwise
796 struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state)
798 struct zpci_dev *zdev;
801 zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, state);
802 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
804 return ERR_PTR(-ENOMEM);
806 /* FID and Function Handle are the static/dynamic identifiers */
810 /* Query function properties and update zdev */
811 rc = clp_query_pci_fn(zdev);
816 kref_init(&zdev->kref);
817 mutex_init(&zdev->lock);
819 rc = zpci_init_iommu(zdev);
823 rc = zpci_bus_device_register(zdev, &pci_root_ops);
825 goto error_destroy_iommu;
827 spin_lock(&zpci_list_lock);
828 list_add_tail(&zdev->entry, &zpci_list);
829 spin_unlock(&zpci_list_lock);
834 zpci_destroy_iommu(zdev);
836 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
841 bool zpci_is_device_configured(struct zpci_dev *zdev)
843 enum zpci_state state = zdev->state;
845 return state != ZPCI_FN_STATE_RESERVED &&
846 state != ZPCI_FN_STATE_STANDBY;
850 * zpci_scan_configured_device() - Scan a freshly configured zpci_dev
851 * @zdev: The zpci_dev to be configured
852 * @fh: The general function handle supplied by the platform
854 * Given a device in the configuration state Configured, enables, scans and
855 * adds it to the common code PCI subsystem if possible. If the PCI device is
856 * parked because we can not yet create a PCI bus because we have not seen
857 * function 0, it is ignored but will be scanned once function 0 appears.
858 * If any failure occurs, the zpci_dev is left disabled.
860 * Return: 0 on success, or an error code otherwise
862 int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh)
866 zpci_update_fh(zdev, fh);
867 /* the PCI function will be scanned once function 0 appears */
868 if (!zdev->zbus->bus)
871 /* For function 0 on a multi-function bus scan whole bus as we might
872 * have to pick up existing functions waiting for it to allow creating
875 if (zdev->devfn == 0 && zdev->zbus->multifunction)
876 rc = zpci_bus_scan_bus(zdev->zbus);
878 rc = zpci_bus_scan_device(zdev);
884 * zpci_deconfigure_device() - Deconfigure a zpci_dev
885 * @zdev: The zpci_dev to configure
887 * Deconfigure a zPCI function that is currently configured and possibly known
888 * to the common code PCI subsystem.
889 * If any failure occurs the device is left as is.
891 * Return: 0 on success, or an error code otherwise
893 int zpci_deconfigure_device(struct zpci_dev *zdev)
898 zpci_bus_remove_device(zdev, false);
900 if (zdev->dma_table) {
901 rc = zpci_dma_exit_device(zdev);
905 if (zdev_enabled(zdev)) {
906 rc = zpci_disable_device(zdev);
911 rc = sclp_pci_deconfigure(zdev->fid);
912 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, rc);
915 zdev->state = ZPCI_FN_STATE_STANDBY;
921 * zpci_device_reserved() - Mark device as resverved
922 * @zdev: the zpci_dev that was reserved
924 * Handle the case that a given zPCI function was reserved by another system.
925 * After a call to this function the zpci_dev can not be found via
926 * get_zdev_by_fid() anymore but may still be accessible via existing
927 * references though it will not be functional anymore.
929 void zpci_device_reserved(struct zpci_dev *zdev)
931 if (zdev->has_hp_slot)
932 zpci_exit_slot(zdev);
934 * Remove device from zpci_list as it is going away. This also
935 * makes sure we ignore subsequent zPCI events for this device.
937 spin_lock(&zpci_list_lock);
938 list_del(&zdev->entry);
939 spin_unlock(&zpci_list_lock);
940 zdev->state = ZPCI_FN_STATE_RESERVED;
941 zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
945 void zpci_release_device(struct kref *kref)
947 struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref);
951 zpci_bus_remove_device(zdev, false);
954 zpci_dma_exit_device(zdev);
955 if (zdev_enabled(zdev))
956 zpci_disable_device(zdev);
958 switch (zdev->state) {
959 case ZPCI_FN_STATE_CONFIGURED:
960 ret = sclp_pci_deconfigure(zdev->fid);
961 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
963 case ZPCI_FN_STATE_STANDBY:
964 if (zdev->has_hp_slot)
965 zpci_exit_slot(zdev);
966 spin_lock(&zpci_list_lock);
967 list_del(&zdev->entry);
968 spin_unlock(&zpci_list_lock);
969 zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
971 case ZPCI_FN_STATE_RESERVED:
972 if (zdev->has_resources)
973 zpci_cleanup_bus_resources(zdev);
974 zpci_bus_device_unregister(zdev);
975 zpci_destroy_iommu(zdev);
980 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
984 int zpci_report_error(struct pci_dev *pdev,
985 struct zpci_report_error_header *report)
987 struct zpci_dev *zdev = to_zpci(pdev);
989 return sclp_pci_report(report, zdev->fh, zdev->fid);
991 EXPORT_SYMBOL(zpci_report_error);
994 * zpci_clear_error_state() - Clears the zPCI error state of the device
995 * @zdev: The zdev for which the zPCI error state should be reset
997 * Clear the zPCI error state of the device. If clearing the zPCI error state
998 * fails the device is left in the error state. In this case it may make sense
999 * to call zpci_io_perm_failure() on the associated pdev if it exists.
1001 * Returns: 0 on success, -EIO otherwise
1003 int zpci_clear_error_state(struct zpci_dev *zdev)
1005 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_ERROR);
1006 struct zpci_fib fib = {0};
1010 cc = zpci_mod_fc(req, &fib, &status);
1012 zpci_dbg(3, "ces fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
1020 * zpci_reset_load_store_blocked() - Re-enables L/S from error state
1021 * @zdev: The zdev for which to unblock load/store access
1023 * Re-enables load/store access for a PCI function in the error state while
1024 * keeping DMA blocked. In this state drivers can poke MMIO space to determine
1025 * if error recovery is possible while catching any rogue DMA access from the
1028 * Returns: 0 on success, -EIO otherwise
1030 int zpci_reset_load_store_blocked(struct zpci_dev *zdev)
1032 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_BLOCK);
1033 struct zpci_fib fib = {0};
1037 cc = zpci_mod_fc(req, &fib, &status);
1039 zpci_dbg(3, "rls fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
1046 static int zpci_mem_init(void)
1048 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
1049 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
1051 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
1052 __alignof__(struct zpci_fmb), 0, NULL);
1053 if (!zdev_fmb_cache)
1056 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
1057 sizeof(*zpci_iomap_start), GFP_KERNEL);
1058 if (!zpci_iomap_start)
1061 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
1062 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
1063 if (!zpci_iomap_bitmap)
1064 goto error_iomap_bitmap;
1066 if (static_branch_likely(&have_mio))
1067 clp_setup_writeback_mio();
1071 kfree(zpci_iomap_start);
1073 kmem_cache_destroy(zdev_fmb_cache);
1078 static void zpci_mem_exit(void)
1080 kfree(zpci_iomap_bitmap);
1081 kfree(zpci_iomap_start);
1082 kmem_cache_destroy(zdev_fmb_cache);
1085 static unsigned int s390_pci_probe __initdata = 1;
1086 unsigned int s390_pci_force_floating __initdata;
1087 static unsigned int s390_pci_initialized;
1089 char * __init pcibios_setup(char *str)
1091 if (!strcmp(str, "off")) {
1095 if (!strcmp(str, "nomio")) {
1096 S390_lowcore.machine_flags &= ~MACHINE_FLAG_PCI_MIO;
1099 if (!strcmp(str, "force_floating")) {
1100 s390_pci_force_floating = 1;
1103 if (!strcmp(str, "norid")) {
1104 s390_pci_no_rid = 1;
1110 bool zpci_is_enabled(void)
1112 return s390_pci_initialized;
1115 static int __init pci_base_init(void)
1119 if (!s390_pci_probe)
1122 if (!test_facility(69) || !test_facility(71)) {
1123 pr_info("PCI is not supported because CPU facilities 69 or 71 are not available\n");
1127 if (MACHINE_HAS_PCI_MIO) {
1128 static_branch_enable(&have_mio);
1132 rc = zpci_debug_init();
1136 rc = zpci_mem_init();
1140 rc = zpci_irq_init();
1144 rc = zpci_dma_init();
1148 rc = clp_scan_pci_devices();
1151 zpci_bus_scan_busses();
1153 s390_pci_initialized = 1;
1167 subsys_initcall_sync(pci_base_init);