2 * Copyright IBM Corp. 2012
5 * Jan Glauber <jang@linux.vnet.ibm.com>
7 * The System z PCI code is a rewrite from a prototype by
8 * the following people (Kudoz!):
18 #define KMSG_COMPONENT "zpci"
19 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
21 #include <linux/kernel.h>
22 #include <linux/slab.h>
23 #include <linux/err.h>
24 #include <linux/export.h>
25 #include <linux/delay.h>
26 #include <linux/irq.h>
27 #include <linux/kernel_stat.h>
28 #include <linux/seq_file.h>
29 #include <linux/pci.h>
30 #include <linux/msi.h>
34 #include <asm/facility.h>
35 #include <asm/pci_insn.h>
36 #include <asm/pci_clp.h>
37 #include <asm/pci_dma.h>
39 #define DEBUG /* enable pr_debug */
41 #define SIC_IRQ_MODE_ALL 0
42 #define SIC_IRQ_MODE_SINGLE 1
44 #define ZPCI_NR_DMA_SPACES 1
45 #define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
47 /* list of all detected zpci devices */
48 static LIST_HEAD(zpci_list);
49 static DEFINE_SPINLOCK(zpci_list_lock);
51 static struct irq_chip zpci_irq_chip = {
53 .irq_unmask = pci_msi_unmask_irq,
54 .irq_mask = pci_msi_mask_irq,
57 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
58 static DEFINE_SPINLOCK(zpci_domain_lock);
60 static struct airq_iv *zpci_aisb_iv;
61 static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];
63 /* Adapter interrupt definitions */
64 static void zpci_irq_handler(struct airq_struct *airq);
66 static struct airq_struct zpci_airq = {
67 .handler = zpci_irq_handler,
72 static DEFINE_SPINLOCK(zpci_iomap_lock);
73 static DECLARE_BITMAP(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
74 struct zpci_iomap_entry *zpci_iomap_start;
75 EXPORT_SYMBOL_GPL(zpci_iomap_start);
77 static struct kmem_cache *zdev_fmb_cache;
79 struct zpci_dev *get_zdev(struct pci_dev *pdev)
81 return (struct zpci_dev *) pdev->sysdata;
84 struct zpci_dev *get_zdev_by_fid(u32 fid)
86 struct zpci_dev *tmp, *zdev = NULL;
88 spin_lock(&zpci_list_lock);
89 list_for_each_entry(tmp, &zpci_list, entry) {
90 if (tmp->fid == fid) {
95 spin_unlock(&zpci_list_lock);
99 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
101 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
104 int pci_domain_nr(struct pci_bus *bus)
106 return ((struct zpci_dev *) bus->sysdata)->domain;
108 EXPORT_SYMBOL_GPL(pci_domain_nr);
110 int pci_proc_domain(struct pci_bus *bus)
112 return pci_domain_nr(bus);
114 EXPORT_SYMBOL_GPL(pci_proc_domain);
116 /* Modify PCI: Register adapter interruptions */
117 static int zpci_set_airq(struct zpci_dev *zdev)
119 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
120 struct zpci_fib fib = {0};
123 fib.sum = 1; /* enable summary notifications */
124 fib.noi = airq_iv_end(zdev->aibv);
125 fib.aibv = (unsigned long) zdev->aibv->vector;
126 fib.aibvo = 0; /* each zdev has its own interrupt vector */
127 fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
128 fib.aisbo = zdev->aisb & 63;
130 return zpci_mod_fc(req, &fib);
133 struct mod_pci_args {
140 static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
142 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
143 struct zpci_fib fib = {0};
145 fib.pba = args->base;
146 fib.pal = args->limit;
147 fib.iota = args->iota;
148 fib.fmb_addr = args->fmb_addr;
150 return zpci_mod_fc(req, &fib);
153 /* Modify PCI: Register I/O address translation parameters */
154 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
155 u64 base, u64 limit, u64 iota)
157 struct mod_pci_args args = { base, limit, iota, 0 };
159 WARN_ON_ONCE(iota & 0x3fff);
160 args.iota |= ZPCI_IOTA_RTTO_FLAG;
161 return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
164 /* Modify PCI: Unregister I/O address translation parameters */
165 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
167 struct mod_pci_args args = { 0, 0, 0, 0 };
169 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
172 /* Modify PCI: Unregister adapter interruptions */
173 static int zpci_clear_airq(struct zpci_dev *zdev)
175 struct mod_pci_args args = { 0, 0, 0, 0 };
177 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args);
180 /* Modify PCI: Set PCI function measurement parameters */
181 int zpci_fmb_enable_device(struct zpci_dev *zdev)
183 struct mod_pci_args args = { 0, 0, 0, 0 };
188 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
191 WARN_ON((u64) zdev->fmb & 0xf);
193 args.fmb_addr = virt_to_phys(zdev->fmb);
194 return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
197 /* Modify PCI: Disable PCI function measurement */
198 int zpci_fmb_disable_device(struct zpci_dev *zdev)
200 struct mod_pci_args args = { 0, 0, 0, 0 };
206 /* Function measurement is disabled if fmb address is zero */
207 rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
209 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
214 #define ZPCI_PCIAS_CFGSPC 15
216 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
218 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
222 rc = zpci_load(&data, req, offset);
224 data = data << ((8 - len) * 8);
225 data = le64_to_cpu(data);
232 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
234 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
238 data = cpu_to_le64(data);
239 data = data >> ((8 - len) * 8);
240 rc = zpci_store(data, req, offset);
244 void pcibios_fixup_bus(struct pci_bus *bus)
248 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
249 resource_size_t size,
250 resource_size_t align)
255 /* combine single writes by using store-block insn */
256 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
258 zpci_memcpy_toio(to, from, count);
261 /* Create a virtual mapping cookie for a PCI BAR */
262 void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max)
264 struct zpci_dev *zdev = get_zdev(pdev);
268 if ((bar & 7) != bar)
271 idx = zdev->bars[bar].map_idx;
272 spin_lock(&zpci_iomap_lock);
273 zpci_iomap_start[idx].fh = zdev->fh;
274 zpci_iomap_start[idx].bar = bar;
275 spin_unlock(&zpci_iomap_lock);
277 addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48);
278 return (void __iomem *) addr;
280 EXPORT_SYMBOL_GPL(pci_iomap);
282 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
286 idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48;
287 spin_lock(&zpci_iomap_lock);
288 zpci_iomap_start[idx].fh = 0;
289 zpci_iomap_start[idx].bar = 0;
290 spin_unlock(&zpci_iomap_lock);
292 EXPORT_SYMBOL_GPL(pci_iounmap);
294 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
297 struct zpci_dev *zdev = get_zdev_by_bus(bus);
300 if (!zdev || devfn != ZPCI_DEVFN)
303 ret = zpci_cfg_load(zdev, where, val, size);
308 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
311 struct zpci_dev *zdev = get_zdev_by_bus(bus);
314 if (!zdev || devfn != ZPCI_DEVFN)
317 ret = zpci_cfg_store(zdev, where, val, size);
322 static struct pci_ops pci_root_ops = {
327 static void zpci_irq_handler(struct airq_struct *airq)
329 unsigned long si, ai;
330 struct airq_iv *aibv;
333 inc_irq_stat(IRQIO_PCI);
335 /* Scan adapter summary indicator bit vector */
336 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
339 /* End of second scan with interrupts on. */
341 /* First scan complete, reenable interrupts. */
342 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
347 /* Scan the adapter interrupt vector for this device. */
348 aibv = zpci_aibv[si];
350 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
353 inc_irq_stat(IRQIO_MSI);
354 airq_iv_lock(aibv, ai);
355 generic_handle_irq(airq_iv_get_data(aibv, ai));
356 airq_iv_unlock(aibv, ai);
361 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
363 struct zpci_dev *zdev = get_zdev(pdev);
364 unsigned int hwirq, msi_vecs;
366 struct msi_desc *msi;
370 if (type == PCI_CAP_ID_MSI && nvec > 1)
372 msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
374 /* Allocate adapter summary indicator bit */
376 aisb = airq_iv_alloc_bit(zpci_aisb_iv);
381 /* Create adapter interrupt vector */
383 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
387 /* Wire up shortcut pointer */
388 zpci_aibv[aisb] = zdev->aibv;
390 /* Request MSI interrupts */
392 list_for_each_entry(msi, &pdev->msi_list, list) {
394 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */
397 rc = irq_set_msi_desc(irq, msi);
400 irq_set_chip_and_handler(irq, &zpci_irq_chip,
403 msg.address_lo = zdev->msi_addr & 0xffffffff;
404 msg.address_hi = zdev->msi_addr >> 32;
405 pci_write_msi_msg(irq, &msg);
406 airq_iv_set_data(zdev->aibv, hwirq, irq);
410 /* Enable adapter interrupts */
411 rc = zpci_set_airq(zdev);
415 return (msi_vecs == nvec) ? 0 : msi_vecs;
418 list_for_each_entry(msi, &pdev->msi_list, list) {
421 irq_set_msi_desc(msi->irq, NULL);
422 irq_free_desc(msi->irq);
423 msi->msg.address_lo = 0;
424 msi->msg.address_hi = 0;
428 zpci_aibv[aisb] = NULL;
429 airq_iv_release(zdev->aibv);
431 airq_iv_free_bit(zpci_aisb_iv, aisb);
436 void arch_teardown_msi_irqs(struct pci_dev *pdev)
438 struct zpci_dev *zdev = get_zdev(pdev);
439 struct msi_desc *msi;
442 /* Disable adapter interrupts */
443 rc = zpci_clear_airq(zdev);
447 /* Release MSI interrupts */
448 list_for_each_entry(msi, &pdev->msi_list, list) {
449 if (msi->msi_attrib.is_msix)
450 __pci_msix_desc_mask_irq(msi, 1);
452 __pci_msi_desc_mask_irq(msi, 1, 1);
453 irq_set_msi_desc(msi->irq, NULL);
454 irq_free_desc(msi->irq);
455 msi->msg.address_lo = 0;
456 msi->msg.address_hi = 0;
461 zpci_aibv[zdev->aisb] = NULL;
462 airq_iv_release(zdev->aibv);
463 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
466 static void zpci_map_resources(struct zpci_dev *zdev)
468 struct pci_dev *pdev = zdev->pdev;
472 for (i = 0; i < PCI_BAR_COUNT; i++) {
473 len = pci_resource_len(pdev, i);
476 pdev->resource[i].start =
477 (resource_size_t __force) pci_iomap(pdev, i, 0);
478 pdev->resource[i].end = pdev->resource[i].start + len - 1;
482 static void zpci_unmap_resources(struct zpci_dev *zdev)
484 struct pci_dev *pdev = zdev->pdev;
488 for (i = 0; i < PCI_BAR_COUNT; i++) {
489 len = pci_resource_len(pdev, i);
492 pci_iounmap(pdev, (void __iomem __force *)
493 pdev->resource[i].start);
497 static int __init zpci_irq_init(void)
501 rc = register_adapter_interrupt(&zpci_airq);
504 /* Set summary to 1 to be called every time for the ISC. */
505 *zpci_airq.lsi_ptr = 1;
508 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
512 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
516 unregister_adapter_interrupt(&zpci_airq);
521 static void zpci_irq_exit(void)
523 airq_iv_release(zpci_aisb_iv);
524 unregister_adapter_interrupt(&zpci_airq);
527 static int zpci_alloc_iomap(struct zpci_dev *zdev)
531 spin_lock(&zpci_iomap_lock);
532 entry = find_first_zero_bit(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
533 if (entry == ZPCI_IOMAP_MAX_ENTRIES) {
534 spin_unlock(&zpci_iomap_lock);
537 set_bit(entry, zpci_iomap);
538 spin_unlock(&zpci_iomap_lock);
542 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
544 spin_lock(&zpci_iomap_lock);
545 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
546 clear_bit(entry, zpci_iomap);
547 spin_unlock(&zpci_iomap_lock);
550 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
551 unsigned long size, unsigned long flags)
555 r = kzalloc(sizeof(*r), GFP_KERNEL);
560 r->end = r->start + size - 1;
562 r->name = zdev->res_name;
564 if (request_resource(&iomem_resource, r)) {
571 static int zpci_setup_bus_resources(struct zpci_dev *zdev,
572 struct list_head *resources)
574 unsigned long addr, size, flags;
575 struct resource *res;
578 snprintf(zdev->res_name, sizeof(zdev->res_name),
579 "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
581 for (i = 0; i < PCI_BAR_COUNT; i++) {
582 if (!zdev->bars[i].size)
584 entry = zpci_alloc_iomap(zdev);
587 zdev->bars[i].map_idx = entry;
589 /* only MMIO is supported */
590 flags = IORESOURCE_MEM;
591 if (zdev->bars[i].val & 8)
592 flags |= IORESOURCE_PREFETCH;
593 if (zdev->bars[i].val & 4)
594 flags |= IORESOURCE_MEM_64;
596 addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48);
598 size = 1UL << zdev->bars[i].size;
600 res = __alloc_res(zdev, addr, size, flags);
602 zpci_free_iomap(zdev, entry);
605 zdev->bars[i].res = res;
606 pci_add_resource(resources, res);
612 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
616 for (i = 0; i < PCI_BAR_COUNT; i++) {
617 if (!zdev->bars[i].size)
620 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
621 release_resource(zdev->bars[i].res);
622 kfree(zdev->bars[i].res);
626 int pcibios_add_device(struct pci_dev *pdev)
628 struct zpci_dev *zdev = get_zdev(pdev);
629 struct resource *res;
633 pdev->dev.groups = zpci_attr_groups;
634 zpci_map_resources(zdev);
636 for (i = 0; i < PCI_BAR_COUNT; i++) {
637 res = &pdev->resource[i];
638 if (res->parent || !res->flags)
640 pci_claim_resource(pdev, i);
646 int pcibios_enable_device(struct pci_dev *pdev, int mask)
648 struct zpci_dev *zdev = get_zdev(pdev);
651 zpci_debug_init_device(zdev);
652 zpci_fmb_enable_device(zdev);
653 zpci_map_resources(zdev);
655 return pci_enable_resources(pdev, mask);
658 void pcibios_disable_device(struct pci_dev *pdev)
660 struct zpci_dev *zdev = get_zdev(pdev);
662 zpci_unmap_resources(zdev);
663 zpci_fmb_disable_device(zdev);
664 zpci_debug_exit_device(zdev);
668 #ifdef CONFIG_HIBERNATE_CALLBACKS
669 static int zpci_restore(struct device *dev)
671 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
674 if (zdev->state != ZPCI_FN_STATE_ONLINE)
677 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
681 zpci_map_resources(zdev);
682 zpci_register_ioat(zdev, 0, zdev->start_dma + PAGE_OFFSET,
683 zdev->start_dma + zdev->iommu_size - 1,
684 (u64) zdev->dma_table);
690 static int zpci_freeze(struct device *dev)
692 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
694 if (zdev->state != ZPCI_FN_STATE_ONLINE)
697 zpci_unregister_ioat(zdev, 0);
698 return clp_disable_fh(zdev);
701 struct dev_pm_ops pcibios_pm_ops = {
702 .thaw_noirq = zpci_restore,
703 .freeze_noirq = zpci_freeze,
704 .restore_noirq = zpci_restore,
705 .poweroff_noirq = zpci_freeze,
707 #endif /* CONFIG_HIBERNATE_CALLBACKS */
709 static int zpci_alloc_domain(struct zpci_dev *zdev)
711 spin_lock(&zpci_domain_lock);
712 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
713 if (zdev->domain == ZPCI_NR_DEVICES) {
714 spin_unlock(&zpci_domain_lock);
717 set_bit(zdev->domain, zpci_domain);
718 spin_unlock(&zpci_domain_lock);
722 static void zpci_free_domain(struct zpci_dev *zdev)
724 spin_lock(&zpci_domain_lock);
725 clear_bit(zdev->domain, zpci_domain);
726 spin_unlock(&zpci_domain_lock);
729 void pcibios_remove_bus(struct pci_bus *bus)
731 struct zpci_dev *zdev = get_zdev_by_bus(bus);
733 zpci_exit_slot(zdev);
734 zpci_cleanup_bus_resources(zdev);
735 zpci_free_domain(zdev);
737 spin_lock(&zpci_list_lock);
738 list_del(&zdev->entry);
739 spin_unlock(&zpci_list_lock);
744 static int zpci_scan_bus(struct zpci_dev *zdev)
746 LIST_HEAD(resources);
749 ret = zpci_setup_bus_resources(zdev, &resources);
753 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
756 zpci_cleanup_bus_resources(zdev);
760 zdev->bus->max_bus_speed = zdev->max_bus_speed;
764 int zpci_enable_device(struct zpci_dev *zdev)
768 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
772 rc = zpci_dma_init_device(zdev);
776 zdev->state = ZPCI_FN_STATE_ONLINE;
780 clp_disable_fh(zdev);
784 EXPORT_SYMBOL_GPL(zpci_enable_device);
786 int zpci_disable_device(struct zpci_dev *zdev)
788 zpci_dma_exit_device(zdev);
789 return clp_disable_fh(zdev);
791 EXPORT_SYMBOL_GPL(zpci_disable_device);
793 int zpci_create_device(struct zpci_dev *zdev)
797 rc = zpci_alloc_domain(zdev);
801 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
802 rc = zpci_enable_device(zdev);
806 rc = zpci_scan_bus(zdev);
810 spin_lock(&zpci_list_lock);
811 list_add_tail(&zdev->entry, &zpci_list);
812 spin_unlock(&zpci_list_lock);
814 zpci_init_slot(zdev);
819 if (zdev->state == ZPCI_FN_STATE_ONLINE)
820 zpci_disable_device(zdev);
822 zpci_free_domain(zdev);
827 void zpci_stop_device(struct zpci_dev *zdev)
829 zpci_dma_exit_device(zdev);
831 * Note: SCLP disables fh via set-pci-fn so don't
835 EXPORT_SYMBOL_GPL(zpci_stop_device);
837 static inline int barsize(u8 size)
839 return (size) ? (1 << size) >> 10 : 0;
842 static int zpci_mem_init(void)
844 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
849 /* TODO: use realloc */
850 zpci_iomap_start = kzalloc(ZPCI_IOMAP_MAX_ENTRIES * sizeof(*zpci_iomap_start),
852 if (!zpci_iomap_start)
857 kmem_cache_destroy(zdev_fmb_cache);
862 static void zpci_mem_exit(void)
864 kfree(zpci_iomap_start);
865 kmem_cache_destroy(zdev_fmb_cache);
868 static unsigned int s390_pci_probe = 1;
869 static unsigned int s390_pci_initialized;
871 char * __init pcibios_setup(char *str)
873 if (!strcmp(str, "off")) {
880 bool zpci_is_enabled(void)
882 return s390_pci_initialized;
885 static int __init pci_base_init(void)
892 if (!test_facility(2) || !test_facility(69)
893 || !test_facility(71) || !test_facility(72))
896 rc = zpci_debug_init();
900 rc = zpci_mem_init();
904 rc = zpci_irq_init();
908 rc = zpci_dma_init();
912 rc = clp_scan_pci_devices();
916 s390_pci_initialized = 1;
930 subsys_initcall_sync(pci_base_init);
932 void zpci_rescan(void)
934 if (zpci_is_enabled())
935 clp_rescan_pci_devices_simple();