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 /* AEN structures that must be preserved over KVM module re-insertion */
65 union zpci_sic_iib *zpci_aipb;
66 EXPORT_SYMBOL_GPL(zpci_aipb);
67 struct airq_iv *zpci_aif_sbv;
68 EXPORT_SYMBOL_GPL(zpci_aif_sbv);
70 struct zpci_dev *get_zdev_by_fid(u32 fid)
72 struct zpci_dev *tmp, *zdev = NULL;
74 spin_lock(&zpci_list_lock);
75 list_for_each_entry(tmp, &zpci_list, entry) {
76 if (tmp->fid == fid) {
82 spin_unlock(&zpci_list_lock);
86 void zpci_remove_reserved_devices(void)
88 struct zpci_dev *tmp, *zdev;
89 enum zpci_state state;
92 spin_lock(&zpci_list_lock);
93 list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
94 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
95 !clp_get_state(zdev->fid, &state) &&
96 state == ZPCI_FN_STATE_RESERVED)
97 list_move_tail(&zdev->entry, &remove);
99 spin_unlock(&zpci_list_lock);
101 list_for_each_entry_safe(zdev, tmp, &remove, entry)
102 zpci_device_reserved(zdev);
105 int pci_domain_nr(struct pci_bus *bus)
107 return ((struct zpci_bus *) bus->sysdata)->domain_nr;
109 EXPORT_SYMBOL_GPL(pci_domain_nr);
111 int pci_proc_domain(struct pci_bus *bus)
113 return pci_domain_nr(bus);
115 EXPORT_SYMBOL_GPL(pci_proc_domain);
117 /* Modify PCI: Register I/O address translation parameters */
118 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
119 u64 base, u64 limit, u64 iota, u8 *status)
121 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
122 struct zpci_fib fib = {0};
125 WARN_ON_ONCE(iota & 0x3fff);
128 fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
130 cc = zpci_mod_fc(req, &fib, status);
132 zpci_dbg(3, "reg ioat fid:%x, cc:%d, status:%d\n", zdev->fid, cc, *status);
135 EXPORT_SYMBOL_GPL(zpci_register_ioat);
137 /* Modify PCI: Unregister I/O address translation parameters */
138 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
140 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
141 struct zpci_fib fib = {0};
146 cc = zpci_mod_fc(req, &fib, &status);
148 zpci_dbg(3, "unreg ioat fid:%x, cc:%d, status:%d\n", zdev->fid, cc, status);
152 /* Modify PCI: Set PCI function measurement parameters */
153 int zpci_fmb_enable_device(struct zpci_dev *zdev)
155 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
156 struct zpci_fib fib = {0};
159 if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
162 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
165 WARN_ON((u64) zdev->fmb & 0xf);
167 /* reset software counters */
168 atomic64_set(&zdev->allocated_pages, 0);
169 atomic64_set(&zdev->mapped_pages, 0);
170 atomic64_set(&zdev->unmapped_pages, 0);
172 fib.fmb_addr = virt_to_phys(zdev->fmb);
174 cc = zpci_mod_fc(req, &fib, &status);
176 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
179 return cc ? -EIO : 0;
182 /* Modify PCI: Disable PCI function measurement */
183 int zpci_fmb_disable_device(struct zpci_dev *zdev)
185 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
186 struct zpci_fib fib = {0};
194 /* Function measurement is disabled if fmb address is zero */
195 cc = zpci_mod_fc(req, &fib, &status);
196 if (cc == 3) /* Function already gone. */
200 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
203 return cc ? -EIO : 0;
206 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
208 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
212 rc = __zpci_load(&data, req, offset);
214 data = le64_to_cpu((__force __le64) data);
215 data >>= (8 - len) * 8;
222 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
224 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
228 data <<= (8 - len) * 8;
229 data = (__force u64) cpu_to_le64(data);
230 rc = __zpci_store(data, req, offset);
234 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
235 resource_size_t size,
236 resource_size_t align)
241 /* combine single writes by using store-block insn */
242 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
244 zpci_memcpy_toio(to, from, count);
247 static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot)
249 unsigned long offset, vaddr;
250 struct vm_struct *area;
251 phys_addr_t last_addr;
253 last_addr = addr + size - 1;
254 if (!size || last_addr < addr)
257 if (!static_branch_unlikely(&have_mio))
258 return (void __iomem *) addr;
260 offset = addr & ~PAGE_MASK;
262 size = PAGE_ALIGN(size + offset);
263 area = get_vm_area(size, VM_IOREMAP);
267 vaddr = (unsigned long) area->addr;
268 if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
272 return (void __iomem *) ((unsigned long) area->addr + offset);
275 void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
277 return __ioremap(addr, size, __pgprot(prot));
279 EXPORT_SYMBOL(ioremap_prot);
281 void __iomem *ioremap(phys_addr_t addr, size_t size)
283 return __ioremap(addr, size, PAGE_KERNEL);
285 EXPORT_SYMBOL(ioremap);
287 void __iomem *ioremap_wc(phys_addr_t addr, size_t size)
289 return __ioremap(addr, size, pgprot_writecombine(PAGE_KERNEL));
291 EXPORT_SYMBOL(ioremap_wc);
293 void __iomem *ioremap_wt(phys_addr_t addr, size_t size)
295 return __ioremap(addr, size, pgprot_writethrough(PAGE_KERNEL));
297 EXPORT_SYMBOL(ioremap_wt);
299 void iounmap(volatile void __iomem *addr)
301 if (static_branch_likely(&have_mio))
302 vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
304 EXPORT_SYMBOL(iounmap);
306 /* Create a virtual mapping cookie for a PCI BAR */
307 static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
308 unsigned long offset, unsigned long max)
310 struct zpci_dev *zdev = to_zpci(pdev);
313 idx = zdev->bars[bar].map_idx;
314 spin_lock(&zpci_iomap_lock);
316 WARN_ON(!++zpci_iomap_start[idx].count);
317 zpci_iomap_start[idx].fh = zdev->fh;
318 zpci_iomap_start[idx].bar = bar;
319 spin_unlock(&zpci_iomap_lock);
321 return (void __iomem *) ZPCI_ADDR(idx) + offset;
324 static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
325 unsigned long offset,
328 unsigned long barsize = pci_resource_len(pdev, bar);
329 struct zpci_dev *zdev = to_zpci(pdev);
332 iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
333 return iova ? iova + offset : iova;
336 void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
337 unsigned long offset, unsigned long max)
339 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
342 if (static_branch_likely(&have_mio))
343 return pci_iomap_range_mio(pdev, bar, offset, max);
345 return pci_iomap_range_fh(pdev, bar, offset, max);
347 EXPORT_SYMBOL(pci_iomap_range);
349 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
351 return pci_iomap_range(dev, bar, 0, maxlen);
353 EXPORT_SYMBOL(pci_iomap);
355 static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
356 unsigned long offset, unsigned long max)
358 unsigned long barsize = pci_resource_len(pdev, bar);
359 struct zpci_dev *zdev = to_zpci(pdev);
362 iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
363 return iova ? iova + offset : iova;
366 void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
367 unsigned long offset, unsigned long max)
369 if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
372 if (static_branch_likely(&have_mio))
373 return pci_iomap_wc_range_mio(pdev, bar, offset, max);
375 return pci_iomap_range_fh(pdev, bar, offset, max);
377 EXPORT_SYMBOL(pci_iomap_wc_range);
379 void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
381 return pci_iomap_wc_range(dev, bar, 0, maxlen);
383 EXPORT_SYMBOL(pci_iomap_wc);
385 static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
387 unsigned int idx = ZPCI_IDX(addr);
389 spin_lock(&zpci_iomap_lock);
390 /* Detect underrun */
391 WARN_ON(!zpci_iomap_start[idx].count);
392 if (!--zpci_iomap_start[idx].count) {
393 zpci_iomap_start[idx].fh = 0;
394 zpci_iomap_start[idx].bar = 0;
396 spin_unlock(&zpci_iomap_lock);
399 static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
404 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
406 if (static_branch_likely(&have_mio))
407 pci_iounmap_mio(pdev, addr);
409 pci_iounmap_fh(pdev, addr);
411 EXPORT_SYMBOL(pci_iounmap);
413 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
416 struct zpci_dev *zdev = zdev_from_bus(bus, devfn);
418 return (zdev) ? zpci_cfg_load(zdev, where, val, size) : -ENODEV;
421 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
424 struct zpci_dev *zdev = zdev_from_bus(bus, devfn);
426 return (zdev) ? zpci_cfg_store(zdev, where, val, size) : -ENODEV;
429 static struct pci_ops pci_root_ops = {
434 static void zpci_map_resources(struct pci_dev *pdev)
436 struct zpci_dev *zdev = to_zpci(pdev);
440 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
441 len = pci_resource_len(pdev, i);
445 if (zpci_use_mio(zdev))
446 pdev->resource[i].start =
447 (resource_size_t __force) zdev->bars[i].mio_wt;
449 pdev->resource[i].start = (resource_size_t __force)
450 pci_iomap_range_fh(pdev, i, 0, 0);
451 pdev->resource[i].end = pdev->resource[i].start + len - 1;
454 zpci_iov_map_resources(pdev);
457 static void zpci_unmap_resources(struct pci_dev *pdev)
459 struct zpci_dev *zdev = to_zpci(pdev);
463 if (zpci_use_mio(zdev))
466 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
467 len = pci_resource_len(pdev, i);
470 pci_iounmap_fh(pdev, (void __iomem __force *)
471 pdev->resource[i].start);
475 static int zpci_alloc_iomap(struct zpci_dev *zdev)
479 spin_lock(&zpci_iomap_lock);
480 entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
481 if (entry == ZPCI_IOMAP_ENTRIES) {
482 spin_unlock(&zpci_iomap_lock);
485 set_bit(entry, zpci_iomap_bitmap);
486 spin_unlock(&zpci_iomap_lock);
490 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
492 spin_lock(&zpci_iomap_lock);
493 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
494 clear_bit(entry, zpci_iomap_bitmap);
495 spin_unlock(&zpci_iomap_lock);
498 static void zpci_do_update_iomap_fh(struct zpci_dev *zdev, u32 fh)
502 spin_lock(&zpci_iomap_lock);
503 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
504 if (!zdev->bars[bar].size)
506 idx = zdev->bars[bar].map_idx;
507 if (!zpci_iomap_start[idx].count)
509 WRITE_ONCE(zpci_iomap_start[idx].fh, zdev->fh);
511 spin_unlock(&zpci_iomap_lock);
514 void zpci_update_fh(struct zpci_dev *zdev, u32 fh)
516 if (!fh || zdev->fh == fh)
520 if (zpci_use_mio(zdev))
522 if (zdev->has_resources && zdev_enabled(zdev))
523 zpci_do_update_iomap_fh(zdev, fh);
526 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
527 unsigned long size, unsigned long flags)
531 r = kzalloc(sizeof(*r), GFP_KERNEL);
536 r->end = r->start + size - 1;
538 r->name = zdev->res_name;
540 if (request_resource(&iomem_resource, r)) {
547 int zpci_setup_bus_resources(struct zpci_dev *zdev,
548 struct list_head *resources)
550 unsigned long addr, size, flags;
551 struct resource *res;
554 snprintf(zdev->res_name, sizeof(zdev->res_name),
555 "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR);
557 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
558 if (!zdev->bars[i].size)
560 entry = zpci_alloc_iomap(zdev);
563 zdev->bars[i].map_idx = entry;
565 /* only MMIO is supported */
566 flags = IORESOURCE_MEM;
567 if (zdev->bars[i].val & 8)
568 flags |= IORESOURCE_PREFETCH;
569 if (zdev->bars[i].val & 4)
570 flags |= IORESOURCE_MEM_64;
572 if (zpci_use_mio(zdev))
573 addr = (unsigned long) zdev->bars[i].mio_wt;
575 addr = ZPCI_ADDR(entry);
576 size = 1UL << zdev->bars[i].size;
578 res = __alloc_res(zdev, addr, size, flags);
580 zpci_free_iomap(zdev, entry);
583 zdev->bars[i].res = res;
584 pci_add_resource(resources, res);
586 zdev->has_resources = 1;
591 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
595 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
596 if (!zdev->bars[i].size || !zdev->bars[i].res)
599 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
600 release_resource(zdev->bars[i].res);
601 kfree(zdev->bars[i].res);
603 zdev->has_resources = 0;
606 int pcibios_device_add(struct pci_dev *pdev)
608 struct zpci_dev *zdev = to_zpci(pdev);
609 struct resource *res;
612 /* The pdev has a reference to the zdev via its bus */
615 pdev->no_vf_scan = 1;
617 pdev->dev.groups = zpci_attr_groups;
618 pdev->dev.dma_ops = &s390_pci_dma_ops;
619 zpci_map_resources(pdev);
621 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
622 res = &pdev->resource[i];
623 if (res->parent || !res->flags)
625 pci_claim_resource(pdev, i);
631 void pcibios_release_device(struct pci_dev *pdev)
633 struct zpci_dev *zdev = to_zpci(pdev);
635 zpci_unmap_resources(pdev);
639 int pcibios_enable_device(struct pci_dev *pdev, int mask)
641 struct zpci_dev *zdev = to_zpci(pdev);
643 zpci_debug_init_device(zdev, dev_name(&pdev->dev));
644 zpci_fmb_enable_device(zdev);
646 return pci_enable_resources(pdev, mask);
649 void pcibios_disable_device(struct pci_dev *pdev)
651 struct zpci_dev *zdev = to_zpci(pdev);
653 zpci_fmb_disable_device(zdev);
654 zpci_debug_exit_device(zdev);
657 static int __zpci_register_domain(int domain)
659 spin_lock(&zpci_domain_lock);
660 if (test_bit(domain, zpci_domain)) {
661 spin_unlock(&zpci_domain_lock);
662 pr_err("Domain %04x is already assigned\n", domain);
665 set_bit(domain, zpci_domain);
666 spin_unlock(&zpci_domain_lock);
670 static int __zpci_alloc_domain(void)
674 spin_lock(&zpci_domain_lock);
676 * We can always auto allocate domains below ZPCI_NR_DEVICES.
677 * There is either a free domain or we have reached the maximum in
678 * which case we would have bailed earlier.
680 domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
681 set_bit(domain, zpci_domain);
682 spin_unlock(&zpci_domain_lock);
686 int zpci_alloc_domain(int domain)
688 if (zpci_unique_uid) {
690 return __zpci_register_domain(domain);
691 pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n");
692 update_uid_checking(false);
694 return __zpci_alloc_domain();
697 void zpci_free_domain(int domain)
699 spin_lock(&zpci_domain_lock);
700 clear_bit(domain, zpci_domain);
701 spin_unlock(&zpci_domain_lock);
705 int zpci_enable_device(struct zpci_dev *zdev)
710 if (clp_enable_fh(zdev, &fh, ZPCI_NR_DMA_SPACES))
713 zpci_update_fh(zdev, fh);
716 EXPORT_SYMBOL_GPL(zpci_enable_device);
718 int zpci_disable_device(struct zpci_dev *zdev)
723 cc = clp_disable_fh(zdev, &fh);
725 zpci_update_fh(zdev, fh);
726 } else if (cc == CLP_RC_SETPCIFN_ALRDY) {
727 pr_info("Disabling PCI function %08x had no effect as it was already disabled\n",
729 /* Function is already disabled - update handle */
730 rc = clp_refresh_fh(zdev->fid, &fh);
732 zpci_update_fh(zdev, fh);
740 EXPORT_SYMBOL_GPL(zpci_disable_device);
743 * zpci_hot_reset_device - perform a reset of the given zPCI function
744 * @zdev: the slot which should be reset
746 * Performs a low level reset of the zPCI function. The reset is low level in
747 * the sense that the zPCI function can be reset without detaching it from the
748 * common PCI subsystem. The reset may be performed while under control of
749 * either DMA or IOMMU APIs in which case the existing DMA/IOMMU translation
750 * table is reinstated at the end of the reset.
752 * After the reset the functions internal state is reset to an initial state
753 * equivalent to its state during boot when first probing a driver.
754 * Consequently after reset the PCI function requires re-initialization via the
755 * common PCI code including re-enabling IRQs via pci_alloc_irq_vectors()
756 * and enabling the function via e.g.pci_enablde_device_flags().The caller
757 * must guard against concurrent reset attempts.
759 * In most cases this function should not be called directly but through
760 * pci_reset_function() or pci_reset_bus() which handle the save/restore and
763 * Return: 0 on success and an error value otherwise
765 int zpci_hot_reset_device(struct zpci_dev *zdev)
770 zpci_dbg(3, "rst fid:%x, fh:%x\n", zdev->fid, zdev->fh);
771 if (zdev_enabled(zdev)) {
772 /* Disables device access, DMAs and IRQs (reset state) */
773 rc = zpci_disable_device(zdev);
775 * Due to a z/VM vs LPAR inconsistency in the error state the
776 * FH may indicate an enabled device but disable says the
777 * device is already disabled don't treat it as an error here.
785 rc = zpci_enable_device(zdev);
790 rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
791 virt_to_phys(zdev->dma_table), &status);
793 rc = zpci_dma_init_device(zdev);
795 zpci_disable_device(zdev);
803 * zpci_create_device() - Create a new zpci_dev and add it to the zbus
804 * @fid: Function ID of the device to be created
805 * @fh: Current Function Handle of the device to be created
806 * @state: Initial state after creation either Standby or Configured
808 * Creates a new zpci device and adds it to its, possibly newly created, zbus
809 * as well as zpci_list.
811 * Returns: the zdev on success or an error pointer otherwise
813 struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state)
815 struct zpci_dev *zdev;
818 zpci_dbg(1, "add fid:%x, fh:%x, c:%d\n", fid, fh, state);
819 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
821 return ERR_PTR(-ENOMEM);
823 /* FID and Function Handle are the static/dynamic identifiers */
827 /* Query function properties and update zdev */
828 rc = clp_query_pci_fn(zdev);
833 kref_init(&zdev->kref);
834 mutex_init(&zdev->lock);
835 mutex_init(&zdev->kzdev_lock);
837 rc = zpci_init_iommu(zdev);
841 rc = zpci_bus_device_register(zdev, &pci_root_ops);
843 goto error_destroy_iommu;
845 spin_lock(&zpci_list_lock);
846 list_add_tail(&zdev->entry, &zpci_list);
847 spin_unlock(&zpci_list_lock);
852 zpci_destroy_iommu(zdev);
854 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
859 bool zpci_is_device_configured(struct zpci_dev *zdev)
861 enum zpci_state state = zdev->state;
863 return state != ZPCI_FN_STATE_RESERVED &&
864 state != ZPCI_FN_STATE_STANDBY;
868 * zpci_scan_configured_device() - Scan a freshly configured zpci_dev
869 * @zdev: The zpci_dev to be configured
870 * @fh: The general function handle supplied by the platform
872 * Given a device in the configuration state Configured, enables, scans and
873 * adds it to the common code PCI subsystem if possible. If the PCI device is
874 * parked because we can not yet create a PCI bus because we have not seen
875 * function 0, it is ignored but will be scanned once function 0 appears.
876 * If any failure occurs, the zpci_dev is left disabled.
878 * Return: 0 on success, or an error code otherwise
880 int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh)
884 zpci_update_fh(zdev, fh);
885 /* the PCI function will be scanned once function 0 appears */
886 if (!zdev->zbus->bus)
889 /* For function 0 on a multi-function bus scan whole bus as we might
890 * have to pick up existing functions waiting for it to allow creating
893 if (zdev->devfn == 0 && zdev->zbus->multifunction)
894 rc = zpci_bus_scan_bus(zdev->zbus);
896 rc = zpci_bus_scan_device(zdev);
902 * zpci_deconfigure_device() - Deconfigure a zpci_dev
903 * @zdev: The zpci_dev to configure
905 * Deconfigure a zPCI function that is currently configured and possibly known
906 * to the common code PCI subsystem.
907 * If any failure occurs the device is left as is.
909 * Return: 0 on success, or an error code otherwise
911 int zpci_deconfigure_device(struct zpci_dev *zdev)
916 zpci_bus_remove_device(zdev, false);
918 if (zdev->dma_table) {
919 rc = zpci_dma_exit_device(zdev);
923 if (zdev_enabled(zdev)) {
924 rc = zpci_disable_device(zdev);
929 rc = sclp_pci_deconfigure(zdev->fid);
930 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, rc);
933 zdev->state = ZPCI_FN_STATE_STANDBY;
939 * zpci_device_reserved() - Mark device as resverved
940 * @zdev: the zpci_dev that was reserved
942 * Handle the case that a given zPCI function was reserved by another system.
943 * After a call to this function the zpci_dev can not be found via
944 * get_zdev_by_fid() anymore but may still be accessible via existing
945 * references though it will not be functional anymore.
947 void zpci_device_reserved(struct zpci_dev *zdev)
949 if (zdev->has_hp_slot)
950 zpci_exit_slot(zdev);
952 * Remove device from zpci_list as it is going away. This also
953 * makes sure we ignore subsequent zPCI events for this device.
955 spin_lock(&zpci_list_lock);
956 list_del(&zdev->entry);
957 spin_unlock(&zpci_list_lock);
958 zdev->state = ZPCI_FN_STATE_RESERVED;
959 zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
963 void zpci_release_device(struct kref *kref)
965 struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref);
969 zpci_bus_remove_device(zdev, false);
972 zpci_dma_exit_device(zdev);
973 if (zdev_enabled(zdev))
974 zpci_disable_device(zdev);
976 switch (zdev->state) {
977 case ZPCI_FN_STATE_CONFIGURED:
978 ret = sclp_pci_deconfigure(zdev->fid);
979 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
981 case ZPCI_FN_STATE_STANDBY:
982 if (zdev->has_hp_slot)
983 zpci_exit_slot(zdev);
984 spin_lock(&zpci_list_lock);
985 list_del(&zdev->entry);
986 spin_unlock(&zpci_list_lock);
987 zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
989 case ZPCI_FN_STATE_RESERVED:
990 if (zdev->has_resources)
991 zpci_cleanup_bus_resources(zdev);
992 zpci_bus_device_unregister(zdev);
993 zpci_destroy_iommu(zdev);
998 zpci_dbg(3, "rem fid:%x\n", zdev->fid);
999 kfree_rcu(zdev, rcu);
1002 int zpci_report_error(struct pci_dev *pdev,
1003 struct zpci_report_error_header *report)
1005 struct zpci_dev *zdev = to_zpci(pdev);
1007 return sclp_pci_report(report, zdev->fh, zdev->fid);
1009 EXPORT_SYMBOL(zpci_report_error);
1012 * zpci_clear_error_state() - Clears the zPCI error state of the device
1013 * @zdev: The zdev for which the zPCI error state should be reset
1015 * Clear the zPCI error state of the device. If clearing the zPCI error state
1016 * fails the device is left in the error state. In this case it may make sense
1017 * to call zpci_io_perm_failure() on the associated pdev if it exists.
1019 * Returns: 0 on success, -EIO otherwise
1021 int zpci_clear_error_state(struct zpci_dev *zdev)
1023 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_ERROR);
1024 struct zpci_fib fib = {0};
1028 cc = zpci_mod_fc(req, &fib, &status);
1030 zpci_dbg(3, "ces fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
1038 * zpci_reset_load_store_blocked() - Re-enables L/S from error state
1039 * @zdev: The zdev for which to unblock load/store access
1041 * Re-enables load/store access for a PCI function in the error state while
1042 * keeping DMA blocked. In this state drivers can poke MMIO space to determine
1043 * if error recovery is possible while catching any rogue DMA access from the
1046 * Returns: 0 on success, -EIO otherwise
1048 int zpci_reset_load_store_blocked(struct zpci_dev *zdev)
1050 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_BLOCK);
1051 struct zpci_fib fib = {0};
1055 cc = zpci_mod_fc(req, &fib, &status);
1057 zpci_dbg(3, "rls fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
1064 static int zpci_mem_init(void)
1066 BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
1067 __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
1069 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
1070 __alignof__(struct zpci_fmb), 0, NULL);
1071 if (!zdev_fmb_cache)
1074 zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
1075 sizeof(*zpci_iomap_start), GFP_KERNEL);
1076 if (!zpci_iomap_start)
1079 zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
1080 sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
1081 if (!zpci_iomap_bitmap)
1082 goto error_iomap_bitmap;
1084 if (static_branch_likely(&have_mio))
1085 clp_setup_writeback_mio();
1089 kfree(zpci_iomap_start);
1091 kmem_cache_destroy(zdev_fmb_cache);
1096 static void zpci_mem_exit(void)
1098 kfree(zpci_iomap_bitmap);
1099 kfree(zpci_iomap_start);
1100 kmem_cache_destroy(zdev_fmb_cache);
1103 static unsigned int s390_pci_probe __initdata = 1;
1104 unsigned int s390_pci_force_floating __initdata;
1105 static unsigned int s390_pci_initialized;
1107 char * __init pcibios_setup(char *str)
1109 if (!strcmp(str, "off")) {
1113 if (!strcmp(str, "nomio")) {
1114 S390_lowcore.machine_flags &= ~MACHINE_FLAG_PCI_MIO;
1117 if (!strcmp(str, "force_floating")) {
1118 s390_pci_force_floating = 1;
1121 if (!strcmp(str, "norid")) {
1122 s390_pci_no_rid = 1;
1128 bool zpci_is_enabled(void)
1130 return s390_pci_initialized;
1133 static int __init pci_base_init(void)
1137 if (!s390_pci_probe)
1140 if (!test_facility(69) || !test_facility(71)) {
1141 pr_info("PCI is not supported because CPU facilities 69 or 71 are not available\n");
1145 if (MACHINE_HAS_PCI_MIO) {
1146 static_branch_enable(&have_mio);
1150 rc = zpci_debug_init();
1154 rc = zpci_mem_init();
1158 rc = zpci_irq_init();
1162 rc = zpci_dma_init();
1166 rc = clp_scan_pci_devices();
1169 zpci_bus_scan_busses();
1171 s390_pci_initialized = 1;
1185 subsys_initcall_sync(pci_base_init);