/* * probe.c - PCI detection and setup code */ #include <linux/kernel.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/pci.h> #include <linux/of_device.h> #include <linux/of_pci.h> #include <linux/pci_hotplug.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/cpumask.h> #include <linux/pci-aspm.h> #include <linux/aer.h> #include <linux/acpi.h> #include <asm-generic/pci-bridge.h> #include "pci.h" #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ #define CARDBUS_RESERVE_BUSNR 3 static struct resource busn_resource = { .name = "PCI busn", .start = 0, .end = 255, .flags = IORESOURCE_BUS, }; /* Ugh. Need to stop exporting this to modules. */ LIST_HEAD(pci_root_buses); EXPORT_SYMBOL(pci_root_buses); static LIST_HEAD(pci_domain_busn_res_list); struct pci_domain_busn_res { struct list_head list; struct resource res; int domain_nr; }; static struct resource *get_pci_domain_busn_res(int domain_nr) { struct pci_domain_busn_res *r; list_for_each_entry(r, &pci_domain_busn_res_list, list) if (r->domain_nr == domain_nr) return &r->res; r = kzalloc(sizeof(*r), GFP_KERNEL); if (!r) return NULL; r->domain_nr = domain_nr; r->res.start = 0; r->res.end = 0xff; r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED; list_add_tail(&r->list, &pci_domain_busn_res_list); return &r->res; } static int find_anything(struct device *dev, void *data) { return 1; } /* * Some device drivers need know if pci is initiated. * Basically, we think pci is not initiated when there * is no device to be found on the pci_bus_type. */ int no_pci_devices(void) { struct device *dev; int no_devices; dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything); no_devices = (dev == NULL); put_device(dev); return no_devices; } EXPORT_SYMBOL(no_pci_devices); /* * PCI Bus Class */ static void release_pcibus_dev(struct device *dev) { struct pci_bus *pci_bus = to_pci_bus(dev); put_device(pci_bus->bridge); pci_bus_remove_resources(pci_bus); pci_release_bus_of_node(pci_bus); kfree(pci_bus); } static struct class pcibus_class = { .name = "pci_bus", .dev_release = &release_pcibus_dev, .dev_groups = pcibus_groups, }; static int __init pcibus_class_init(void) { return class_register(&pcibus_class); } postcore_initcall(pcibus_class_init); static u64 pci_size(u64 base, u64 maxbase, u64 mask) { u64 size = mask & maxbase; /* Find the significant bits */ if (!size) return 0; /* Get the lowest of them to find the decode size, and from that the extent. */ size = (size & ~(size-1)) - 1; /* base == maxbase can be valid only if the BAR has already been programmed with all 1s. */ if (base == maxbase && ((base | size) & mask) != mask) return 0; return size; } static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar) { u32 mem_type; unsigned long flags; if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) { flags = bar & ~PCI_BASE_ADDRESS_IO_MASK; flags |= IORESOURCE_IO; return flags; } flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK; flags |= IORESOURCE_MEM; if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) flags |= IORESOURCE_PREFETCH; mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK; switch (mem_type) { case PCI_BASE_ADDRESS_MEM_TYPE_32: break; case PCI_BASE_ADDRESS_MEM_TYPE_1M: /* 1M mem BAR treated as 32-bit BAR */ break; case PCI_BASE_ADDRESS_MEM_TYPE_64: flags |= IORESOURCE_MEM_64; break; default: /* mem unknown type treated as 32-bit BAR */ break; } return flags; } #define PCI_COMMAND_DECODE_ENABLE (PCI_COMMAND_MEMORY | PCI_COMMAND_IO) /** * pci_read_base - read a PCI BAR * @dev: the PCI device * @type: type of the BAR * @res: resource buffer to be filled in * @pos: BAR position in the config space * * Returns 1 if the BAR is 64-bit, or 0 if 32-bit. */ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, struct resource *res, unsigned int pos) { u32 l, sz, mask; u64 l64, sz64, mask64; u16 orig_cmd; struct pci_bus_region region, inverted_region; mask = type ? PCI_ROM_ADDRESS_MASK : ~0; /* No printks while decoding is disabled! */ if (!dev->mmio_always_on) { pci_read_config_word(dev, PCI_COMMAND, &orig_cmd); if (orig_cmd & PCI_COMMAND_DECODE_ENABLE) { pci_write_config_word(dev, PCI_COMMAND, orig_cmd & ~PCI_COMMAND_DECODE_ENABLE); } } res->name = pci_name(dev); pci_read_config_dword(dev, pos, &l); pci_write_config_dword(dev, pos, l | mask); pci_read_config_dword(dev, pos, &sz); pci_write_config_dword(dev, pos, l); /* * All bits set in sz means the device isn't working properly. * If the BAR isn't implemented, all bits must be 0. If it's a * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit * 1 must be clear. */ if (sz == 0xffffffff) sz = 0; /* * I don't know how l can have all bits set. Copied from old code. * Maybe it fixes a bug on some ancient platform. */ if (l == 0xffffffff) l = 0; if (type == pci_bar_unknown) { res->flags = decode_bar(dev, l); res->flags |= IORESOURCE_SIZEALIGN; if (res->flags & IORESOURCE_IO) { l64 = l & PCI_BASE_ADDRESS_IO_MASK; sz64 = sz & PCI_BASE_ADDRESS_IO_MASK; mask64 = PCI_BASE_ADDRESS_IO_MASK & (u32)IO_SPACE_LIMIT; } else { l64 = l & PCI_BASE_ADDRESS_MEM_MASK; sz64 = sz & PCI_BASE_ADDRESS_MEM_MASK; mask64 = (u32)PCI_BASE_ADDRESS_MEM_MASK; } } else { res->flags |= (l & IORESOURCE_ROM_ENABLE); l64 = l & PCI_ROM_ADDRESS_MASK; sz64 = sz & PCI_ROM_ADDRESS_MASK; mask64 = (u32)PCI_ROM_ADDRESS_MASK; } if (res->flags & IORESOURCE_MEM_64) { pci_read_config_dword(dev, pos + 4, &l); pci_write_config_dword(dev, pos + 4, ~0); pci_read_config_dword(dev, pos + 4, &sz); pci_write_config_dword(dev, pos + 4, l); l64 |= ((u64)l << 32); sz64 |= ((u64)sz << 32); mask64 |= ((u64)~0 << 32); } if (!dev->mmio_always_on && (orig_cmd & PCI_COMMAND_DECODE_ENABLE)) pci_write_config_word(dev, PCI_COMMAND, orig_cmd); if (!sz64) goto fail; sz64 = pci_size(l64, sz64, mask64); if (!sz64) { dev_info(&dev->dev, FW_BUG "reg 0x%x: invalid BAR (can't size)\n", pos); goto fail; } if (res->flags & IORESOURCE_MEM_64) { if ((sizeof(pci_bus_addr_t) < 8 || sizeof(resource_size_t) < 8) && sz64 > 0x100000000ULL) { res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED; res->start = 0; res->end = 0; dev_err(&dev->dev, "reg 0x%x: can't handle BAR larger than 4GB (size %#010llx)\n", pos, (unsigned long long)sz64); goto out; } if ((sizeof(pci_bus_addr_t) < 8) && l) { /* Above 32-bit boundary; try to reallocate */ res->flags |= IORESOURCE_UNSET; res->start = 0; res->end = sz64; dev_info(&dev->dev, "reg 0x%x: can't handle BAR above 4GB (bus address %#010llx)\n", pos, (unsigned long long)l64); goto out; } } region.start = l64; region.end = l64 + sz64; pcibios_bus_to_resource(dev->bus, res, ®ion); pcibios_resource_to_bus(dev->bus, &inverted_region, res); /* * If "A" is a BAR value (a bus address), "bus_to_resource(A)" is * the corresponding resource address (the physical address used by * the CPU. Converting that resource address back to a bus address * should yield the original BAR value: * * resource_to_bus(bus_to_resource(A)) == A * * If it doesn't, CPU accesses to "bus_to_resource(A)" will not * be claimed by the device. */ if (inverted_region.start != region.start) { res->flags |= IORESOURCE_UNSET; res->start = 0; res->end = region.end - region.start; dev_info(&dev->dev, "reg 0x%x: initial BAR value %#010llx invalid\n", pos, (unsigned long long)region.start); } goto out; fail: res->flags = 0; out: if (res->flags) dev_printk(KERN_DEBUG, &dev->dev, "reg 0x%x: %pR\n", pos, res); return (res->flags & IORESOURCE_MEM_64) ? 1 : 0; } static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) { unsigned int pos, reg; for (pos = 0; pos < howmany; pos++) { struct resource *res = &dev->resource[pos]; reg = PCI_BASE_ADDRESS_0 + (pos << 2); pos += __pci_read_base(dev, pci_bar_unknown, res, reg); } if (rom) { struct resource *res = &dev->resource[PCI_ROM_RESOURCE]; dev->rom_base_reg = rom; res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_READONLY | IORESOURCE_SIZEALIGN; __pci_read_base(dev, pci_bar_mem32, res, rom); } } static void pci_read_bridge_io(struct pci_bus *child) { struct pci_dev *dev = child->self; u8 io_base_lo, io_limit_lo; unsigned long io_mask, io_granularity, base, limit; struct pci_bus_region region; struct resource *res; io_mask = PCI_IO_RANGE_MASK; io_granularity = 0x1000; if (dev->io_window_1k) { /* Support 1K I/O space granularity */ io_mask = PCI_IO_1K_RANGE_MASK; io_granularity = 0x400; } res = child->resource[0]; pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); base = (io_base_lo & io_mask) << 8; limit = (io_limit_lo & io_mask) << 8; if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { u16 io_base_hi, io_limit_hi; pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); base |= ((unsigned long) io_base_hi << 16); limit |= ((unsigned long) io_limit_hi << 16); } if (base <= limit) { res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; region.start = base; region.end = limit + io_granularity - 1; pcibios_bus_to_resource(dev->bus, res, ®ion); dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); } } static void pci_read_bridge_mmio(struct pci_bus *child) { struct pci_dev *dev = child->self; u16 mem_base_lo, mem_limit_lo; unsigned long base, limit; struct pci_bus_region region; struct resource *res; res = child->resource[1]; pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; if (base <= limit) { res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; region.start = base; region.end = limit + 0xfffff; pcibios_bus_to_resource(dev->bus, res, ®ion); dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); } } static void pci_read_bridge_mmio_pref(struct pci_bus *child) { struct pci_dev *dev = child->self; u16 mem_base_lo, mem_limit_lo; u64 base64, limit64; pci_bus_addr_t base, limit; struct pci_bus_region region; struct resource *res; res = child->resource[2]; pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); base64 = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16; limit64 = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { u32 mem_base_hi, mem_limit_hi; pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); /* * Some bridges set the base > limit by default, and some * (broken) BIOSes do not initialize them. If we find * this, just assume they are not being used. */ if (mem_base_hi <= mem_limit_hi) { base64 |= (u64) mem_base_hi << 32; limit64 |= (u64) mem_limit_hi << 32; } } base = (pci_bus_addr_t) base64; limit = (pci_bus_addr_t) limit64; if (base != base64) { dev_err(&dev->dev, "can't handle bridge window above 4GB (bus address %#010llx)\n", (unsigned long long) base64); return; } if (base <= limit) { res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH; if (res->flags & PCI_PREF_RANGE_TYPE_64) res->flags |= IORESOURCE_MEM_64; region.start = base; region.end = limit + 0xfffff; pcibios_bus_to_resource(dev->bus, res, ®ion); dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); } } void pci_read_bridge_bases(struct pci_bus *child) { struct pci_dev *dev = child->self; struct resource *res; int i; if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */ return; dev_info(&dev->dev, "PCI bridge to %pR%s\n", &child->busn_res, dev->transparent ? " (subtractive decode)" : ""); pci_bus_remove_resources(child); for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; pci_read_bridge_io(child); pci_read_bridge_mmio(child); pci_read_bridge_mmio_pref(child); if (dev->transparent) { pci_bus_for_each_resource(child->parent, res, i) { if (res && res->flags) { pci_bus_add_resource(child, res, PCI_SUBTRACTIVE_DECODE); dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR (subtractive decode)\n", res); } } } } static struct pci_bus *pci_alloc_bus(struct pci_bus *parent) { struct pci_bus *b; b = kzalloc(sizeof(*b), GFP_KERNEL); if (!b) return NULL; INIT_LIST_HEAD(&b->node); INIT_LIST_HEAD(&b->children); INIT_LIST_HEAD(&b->devices); INIT_LIST_HEAD(&b->slots); INIT_LIST_HEAD(&b->resources); b->max_bus_speed = PCI_SPEED_UNKNOWN; b->cur_bus_speed = PCI_SPEED_UNKNOWN; #ifdef CONFIG_PCI_DOMAINS_GENERIC if (parent) b->domain_nr = parent->domain_nr; #endif return b; } static void pci_release_host_bridge_dev(struct device *dev) { struct pci_host_bridge *bridge = to_pci_host_bridge(dev); if (bridge->release_fn) bridge->release_fn(bridge); pci_free_resource_list(&bridge->windows); kfree(bridge); } static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b) { struct pci_host_bridge *bridge; bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); if (!bridge) return NULL; INIT_LIST_HEAD(&bridge->windows); bridge->bus = b; return bridge; } static const unsigned char pcix_bus_speed[] = { PCI_SPEED_UNKNOWN, /* 0 */ PCI_SPEED_66MHz_PCIX, /* 1 */ PCI_SPEED_100MHz_PCIX, /* 2 */ PCI_SPEED_133MHz_PCIX, /* 3 */ PCI_SPEED_UNKNOWN, /* 4 */ PCI_SPEED_66MHz_PCIX_ECC, /* 5 */ PCI_SPEED_100MHz_PCIX_ECC, /* 6 */ PCI_SPEED_133MHz_PCIX_ECC, /* 7 */ PCI_SPEED_UNKNOWN, /* 8 */ PCI_SPEED_66MHz_PCIX_266, /* 9 */ PCI_SPEED_100MHz_PCIX_266, /* A */ PCI_SPEED_133MHz_PCIX_266, /* B */ PCI_SPEED_UNKNOWN, /* C */ PCI_SPEED_66MHz_PCIX_533, /* D */ PCI_SPEED_100MHz_PCIX_533, /* E */ PCI_SPEED_133MHz_PCIX_533 /* F */ }; const unsigned char pcie_link_speed[] = { PCI_SPEED_UNKNOWN, /* 0 */ PCIE_SPEED_2_5GT, /* 1 */ PCIE_SPEED_5_0GT, /* 2 */ PCIE_SPEED_8_0GT, /* 3 */ PCI_SPEED_UNKNOWN, /* 4 */ PCI_SPEED_UNKNOWN, /* 5 */ PCI_SPEED_UNKNOWN, /* 6 */ PCI_SPEED_UNKNOWN, /* 7 */ PCI_SPEED_UNKNOWN, /* 8 */ PCI_SPEED_UNKNOWN, /* 9 */ PCI_SPEED_UNKNOWN, /* A */ PCI_SPEED_UNKNOWN, /* B */ PCI_SPEED_UNKNOWN, /* C */ PCI_SPEED_UNKNOWN, /* D */ PCI_SPEED_UNKNOWN, /* E */ PCI_SPEED_UNKNOWN /* F */ }; void pcie_update_link_speed(struct pci_bus *bus, u16 linksta) { bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS]; } EXPORT_SYMBOL_GPL(pcie_update_link_speed); static unsigned char agp_speeds[] = { AGP_UNKNOWN, AGP_1X, AGP_2X, AGP_4X, AGP_8X }; static enum pci_bus_speed agp_speed(int agp3, int agpstat) { int index = 0; if (agpstat & 4) index = 3; else if (agpstat & 2) index = 2; else if (agpstat & 1) index = 1; else goto out; if (agp3) { index += 2; if (index == 5) index = 0; } out: return agp_speeds[index]; } static void pci_set_bus_speed(struct pci_bus *bus) { struct pci_dev *bridge = bus->self; int pos; pos = pci_find_capability(bridge, PCI_CAP_ID_AGP); if (!pos) pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3); if (pos) { u32 agpstat, agpcmd; pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat); bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7); pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd); bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7); } pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX); if (pos) { u16 status; enum pci_bus_speed max; pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS, &status); if (status & PCI_X_SSTATUS_533MHZ) { max = PCI_SPEED_133MHz_PCIX_533; } else if (status & PCI_X_SSTATUS_266MHZ) { max = PCI_SPEED_133MHz_PCIX_266; } else if (status & PCI_X_SSTATUS_133MHZ) { if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2) max = PCI_SPEED_133MHz_PCIX_ECC; else max = PCI_SPEED_133MHz_PCIX; } else { max = PCI_SPEED_66MHz_PCIX; } bus->max_bus_speed = max; bus->cur_bus_speed = pcix_bus_speed[ (status & PCI_X_SSTATUS_FREQ) >> 6]; return; } if (pci_is_pcie(bridge)) { u32 linkcap; u16 linksta; pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap); bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS]; pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta); pcie_update_link_speed(bus, linksta); } } static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus) { struct irq_domain *d; /* * Any firmware interface that can resolve the msi_domain * should be called from here. */ d = pci_host_bridge_of_msi_domain(bus); return d; } static void pci_set_bus_msi_domain(struct pci_bus *bus) { struct irq_domain *d; struct pci_bus *b; /* * The bus can be a root bus, a subordinate bus, or a virtual bus * created by an SR-IOV device. Walk up to the first bridge device * found or derive the domain from the host bridge. */ for (b = bus, d = NULL; !d && !pci_is_root_bus(b); b = b->parent) { if (b->self) d = dev_get_msi_domain(&b->self->dev); } if (!d) d = pci_host_bridge_msi_domain(b); dev_set_msi_domain(&bus->dev, d); } static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, struct pci_dev *bridge, int busnr) { struct pci_bus *child; int i; int ret; /* * Allocate a new bus, and inherit stuff from the parent.. */ child = pci_alloc_bus(parent); if (!child) return NULL; child->parent = parent; child->ops = parent->ops; child->msi = parent->msi; child->sysdata = parent->sysdata; child->bus_flags = parent->bus_flags; /* initialize some portions of the bus device, but don't register it * now as the parent is not properly set up yet. */ child->dev.class = &pcibus_class; dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr); /* * Set up the primary, secondary and subordinate * bus numbers. */ child->number = child->busn_res.start = busnr; child->primary = parent->busn_res.start; child->busn_res.end = 0xff; if (!bridge) { child->dev.parent = parent->bridge; goto add_dev; } child->self = bridge; child->bridge = get_device(&bridge->dev); child->dev.parent = child->bridge; pci_set_bus_of_node(child); pci_set_bus_speed(child); /* Set up default resource pointers and names.. */ for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) { child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; child->resource[i]->name = child->name; } bridge->subordinate = child; add_dev: pci_set_bus_msi_domain(child); ret = device_register(&child->dev); WARN_ON(ret < 0); pcibios_add_bus(child); /* Create legacy_io and legacy_mem files for this bus */ pci_create_legacy_files(child); return child; } struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr) { struct pci_bus *child; child = pci_alloc_child_bus(parent, dev, busnr); if (child) { down_write(&pci_bus_sem); list_add_tail(&child->node, &parent->children); up_write(&pci_bus_sem); } return child; } EXPORT_SYMBOL(pci_add_new_bus); static void pci_enable_crs(struct pci_dev *pdev) { u16 root_cap = 0; /* Enable CRS Software Visibility if supported */ pcie_capability_read_word(pdev, PCI_EXP_RTCAP, &root_cap); if (root_cap & PCI_EXP_RTCAP_CRSVIS) pcie_capability_set_word(pdev, PCI_EXP_RTCTL, PCI_EXP_RTCTL_CRSSVE); } /* * If it's a bridge, configure it and scan the bus behind it. * For CardBus bridges, we don't scan behind as the devices will * be handled by the bridge driver itself. * * We need to process bridges in two passes -- first we scan those * already configured by the BIOS and after we are done with all of * them, we proceed to assigning numbers to the remaining buses in * order to avoid overlaps between old and new bus numbers. */ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) { struct pci_bus *child; int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); u32 buses, i, j = 0; u16 bctl; u8 primary, secondary, subordinate; int broken = 0; pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); primary = buses & 0xFF; secondary = (buses >> 8) & 0xFF; subordinate = (buses >> 16) & 0xFF; dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n", secondary, subordinate, pass); if (!primary && (primary != bus->number) && secondary && subordinate) { dev_warn(&dev->dev, "Primary bus is hard wired to 0\n"); primary = bus->number; } /* Check if setup is sensible at all */ if (!pass && (primary != bus->number || secondary <= bus->number || secondary > subordinate)) { dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n", secondary, subordinate); broken = 1; } /* Disable MasterAbortMode during probing to avoid reporting of bus errors (in some architectures) */ pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); pci_enable_crs(dev); if ((secondary || subordinate) && !pcibios_assign_all_busses() && !is_cardbus && !broken) { unsigned int cmax; /* * Bus already configured by firmware, process it in the first * pass and just note the configuration. */ if (pass) goto out; /* * The bus might already exist for two reasons: Either we are * rescanning the bus or the bus is reachable through more than * one bridge. The second case can happen with the i450NX * chipset. */ child = pci_find_bus(pci_domain_nr(bus), secondary); if (!child) { child = pci_add_new_bus(bus, dev, secondary); if (!child) goto out; child->primary = primary; pci_bus_insert_busn_res(child, secondary, subordinate); child->bridge_ctl = bctl; } cmax = pci_scan_child_bus(child); if (cmax > subordinate) dev_warn(&dev->dev, "bridge has subordinate %02x but max busn %02x\n", subordinate, cmax); /* subordinate should equal child->busn_res.end */ if (subordinate > max) max = subordinate; } else { /* * We need to assign a number to this bus which we always * do in the second pass. */ if (!pass) { if (pcibios_assign_all_busses() || broken || is_cardbus) /* Temporarily disable forwarding of the configuration cycles on all bridges in this bus segment to avoid possible conflicts in the second pass between two bridges programmed with overlapping bus ranges. */ pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses & ~0xffffff); goto out; } /* Clear errors */ pci_write_config_word(dev, PCI_STATUS, 0xffff); /* Prevent assigning a bus number that already exists. * This can happen when a bridge is hot-plugged, so in * this case we only re-scan this bus. */ child = pci_find_bus(pci_domain_nr(bus), max+1); if (!child) { child = pci_add_new_bus(bus, dev, max+1); if (!child) goto out; pci_bus_insert_busn_res(child, max+1, 0xff); } max++; buses = (buses & 0xff000000) | ((unsigned int)(child->primary) << 0) | ((unsigned int)(child->busn_res.start) << 8) | ((unsigned int)(child->busn_res.end) << 16); /* * yenta.c forces a secondary latency timer of 176. * Copy that behaviour here. */ if (is_cardbus) { buses &= ~0xff000000; buses |= CARDBUS_LATENCY_TIMER << 24; } /* * We need to blast all three values with a single write. */ pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); if (!is_cardbus) { child->bridge_ctl = bctl; max = pci_scan_child_bus(child); } else { /* * For CardBus bridges, we leave 4 bus numbers * as cards with a PCI-to-PCI bridge can be * inserted later. */ for (i = 0; i < CARDBUS_RESERVE_BUSNR; i++) { struct pci_bus *parent = bus; if (pci_find_bus(pci_domain_nr(bus), max+i+1)) break; while (parent->parent) { if ((!pcibios_assign_all_busses()) && (parent->busn_res.end > max) && (parent->busn_res.end <= max+i)) { j = 1; } parent = parent->parent; } if (j) { /* * Often, there are two cardbus bridges * -- try to leave one valid bus number * for each one. */ i /= 2; break; } } max += i; } /* * Set the subordinate bus number to its real value. */ pci_bus_update_busn_res_end(child, max); pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); } sprintf(child->name, (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"), pci_domain_nr(bus), child->number); /* Has only triggered on CardBus, fixup is in yenta_socket */ while (bus->parent) { if ((child->busn_res.end > bus->busn_res.end) || (child->number > bus->busn_res.end) || (child->number < bus->number) || (child->busn_res.end < bus->number)) { dev_info(&child->dev, "%pR %s hidden behind%s bridge %s %pR\n", &child->busn_res, (bus->number > child->busn_res.end && bus->busn_res.end < child->number) ? "wholly" : "partially", bus->self->transparent ? " transparent" : "", dev_name(&bus->dev), &bus->busn_res); } bus = bus->parent; } out: pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); return max; } EXPORT_SYMBOL(pci_scan_bridge); /* * Read interrupt line and base address registers. * The architecture-dependent code can tweak these, of course. */ static void pci_read_irq(struct pci_dev *dev) { unsigned char irq; pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); dev->pin = irq; if (irq) pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); dev->irq = irq; } void set_pcie_port_type(struct pci_dev *pdev) { int pos; u16 reg16; int type; struct pci_dev *parent; pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); if (!pos) return; pdev->pcie_cap = pos; pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); pdev->pcie_flags_reg = reg16; pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16); pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD; /* * A Root Port is always the upstream end of a Link. No PCIe * component has two Links. Two Links are connected by a Switch * that has a Port on each Link and internal logic to connect the * two Ports. */ type = pci_pcie_type(pdev); if (type == PCI_EXP_TYPE_ROOT_PORT) pdev->has_secondary_link = 1; else if (type == PCI_EXP_TYPE_UPSTREAM || type == PCI_EXP_TYPE_DOWNSTREAM) { parent = pci_upstream_bridge(pdev); /* * Usually there's an upstream device (Root Port or Switch * Downstream Port), but we can't assume one exists. */ if (parent && !parent->has_secondary_link) pdev->has_secondary_link = 1; } } void set_pcie_hotplug_bridge(struct pci_dev *pdev) { u32 reg32; pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32); if (reg32 & PCI_EXP_SLTCAP_HPC) pdev->is_hotplug_bridge = 1; } /** * pci_ext_cfg_is_aliased - is ext config space just an alias of std config? * @dev: PCI device * * PCI Express to PCI/PCI-X Bridge Specification, rev 1.0, 4.1.4 says that * when forwarding a type1 configuration request the bridge must check that * the extended register address field is zero. The bridge is not permitted * to forward the transactions and must handle it as an Unsupported Request. * Some bridges do not follow this rule and simply drop the extended register * bits, resulting in the standard config space being aliased, every 256 * bytes across the entire configuration space. Test for this condition by * comparing the first dword of each potential alias to the vendor/device ID. * Known offenders: * ASM1083/1085 PCIe-to-PCI Reversible Bridge (1b21:1080, rev 01 & 03) * AMD/ATI SBx00 PCI to PCI Bridge (1002:4384, rev 40) */ static bool pci_ext_cfg_is_aliased(struct pci_dev *dev) { #ifdef CONFIG_PCI_QUIRKS int pos; u32 header, tmp; pci_read_config_dword(dev, PCI_VENDOR_ID, &header); for (pos = PCI_CFG_SPACE_SIZE; pos < PCI_CFG_SPACE_EXP_SIZE; pos += PCI_CFG_SPACE_SIZE) { if (pci_read_config_dword(dev, pos, &tmp) != PCIBIOS_SUCCESSFUL || header != tmp) return false; } return true; #else return false; #endif } /** * pci_cfg_space_size - get the configuration space size of the PCI device. * @dev: PCI device * * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices * have 4096 bytes. Even if the device is capable, that doesn't mean we can * access it. Maybe we don't have a way to generate extended config space * accesses, or the device is behind a reverse Express bridge. So we try * reading the dword at 0x100 which must either be 0 or a valid extended * capability header. */ static int pci_cfg_space_size_ext(struct pci_dev *dev) { u32 status; int pos = PCI_CFG_SPACE_SIZE; if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL) goto fail; if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev)) goto fail; return PCI_CFG_SPACE_EXP_SIZE; fail: return PCI_CFG_SPACE_SIZE; } int pci_cfg_space_size(struct pci_dev *dev) { int pos; u32 status; u16 class; class = dev->class >> 8; if (class == PCI_CLASS_BRIDGE_HOST) return pci_cfg_space_size_ext(dev); if (!pci_is_pcie(dev)) { pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); if (!pos) goto fail; pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) goto fail; } return pci_cfg_space_size_ext(dev); fail: return PCI_CFG_SPACE_SIZE; } #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) void pci_msi_setup_pci_dev(struct pci_dev *dev) { /* * Disable the MSI hardware to avoid screaming interrupts * during boot. This is the power on reset default so * usually this should be a noop. */ dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI); if (dev->msi_cap) pci_msi_set_enable(dev, 0); dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX); if (dev->msix_cap) pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0); } /** * pci_setup_device - fill in class and map information of a device * @dev: the device structure to fill * * Initialize the device structure with information about the device's * vendor,class,memory and IO-space addresses,IRQ lines etc. * Called at initialisation of the PCI subsystem and by CardBus services. * Returns 0 on success and negative if unknown type of device (not normal, * bridge or CardBus). */ int pci_setup_device(struct pci_dev *dev) { u32 class; u8 hdr_type; int pos = 0; struct pci_bus_region region; struct resource *res; if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type)) return -EIO; dev->sysdata = dev->bus->sysdata; dev->dev.parent = dev->bus->bridge; dev->dev.bus = &pci_bus_type; dev->hdr_type = hdr_type & 0x7f; dev->multifunction = !!(hdr_type & 0x80); dev->error_state = pci_channel_io_normal; set_pcie_port_type(dev); pci_dev_assign_slot(dev); /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) set this higher, assuming the system even supports it. */ dev->dma_mask = 0xffffffff; dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); dev->revision = class & 0xff; dev->class = class >> 8; /* upper 3 bytes */ dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n", dev->vendor, dev->device, dev->hdr_type, dev->class); /* need to have dev->class ready */ dev->cfg_size = pci_cfg_space_size(dev); /* "Unknown power state" */ dev->current_state = PCI_UNKNOWN; pci_msi_setup_pci_dev(dev); /* Early fixups, before probing the BARs */ pci_fixup_device(pci_fixup_early, dev); /* device class may be changed after fixup */ class = dev->class >> 8; switch (dev->hdr_type) { /* header type */ case PCI_HEADER_TYPE_NORMAL: /* standard header */ if (class == PCI_CLASS_BRIDGE_PCI) goto bad; pci_read_irq(dev); pci_read_bases(dev, 6, PCI_ROM_ADDRESS); pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); /* * Do the ugly legacy mode stuff here rather than broken chip * quirk code. Legacy mode ATA controllers have fixed * addresses. These are not always echoed in BAR0-3, and * BAR0-3 in a few cases contain junk! */ if (class == PCI_CLASS_STORAGE_IDE) { u8 progif; pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); if ((progif & 1) == 0) { region.start = 0x1F0; region.end = 0x1F7; res = &dev->resource[0]; res->flags = LEGACY_IO_RESOURCE; pcibios_bus_to_resource(dev->bus, res, ®ion); dev_info(&dev->dev, "legacy IDE quirk: reg 0x10: %pR\n", res); region.start = 0x3F6; region.end = 0x3F6; res = &dev->resource[1]; res->flags = LEGACY_IO_RESOURCE; pcibios_bus_to_resource(dev->bus, res, ®ion); dev_info(&dev->dev, "legacy IDE quirk: reg 0x14: %pR\n", res); } if ((progif & 4) == 0) { region.start = 0x170; region.end = 0x177; res = &dev->resource[2]; res->flags = LEGACY_IO_RESOURCE; pcibios_bus_to_resource(dev->bus, res, ®ion); dev_info(&dev->dev, "legacy IDE quirk: reg 0x18: %pR\n", res); region.start = 0x376; region.end = 0x376; res = &dev->resource[3]; res->flags = LEGACY_IO_RESOURCE; pcibios_bus_to_resource(dev->bus, res, ®ion); dev_info(&dev->dev, "legacy IDE quirk: reg 0x1c: %pR\n", res); } } break; case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ if (class != PCI_CLASS_BRIDGE_PCI) goto bad; /* The PCI-to-PCI bridge spec requires that subtractive decoding (i.e. transparent) bridge must have programming interface code of 0x01. */ pci_read_irq(dev); dev->transparent = ((dev->class & 0xff) == 1); pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); set_pcie_hotplug_bridge(dev); pos = pci_find_capability(dev, PCI_CAP_ID_SSVID); if (pos) { pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor); pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device); } break; case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ if (class != PCI_CLASS_BRIDGE_CARDBUS) goto bad; pci_read_irq(dev); pci_read_bases(dev, 1, 0); pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); break; default: /* unknown header */ dev_err(&dev->dev, "unknown header type %02x, ignoring device\n", dev->hdr_type); return -EIO; bad: dev_err(&dev->dev, "ignoring class %#08x (doesn't match header type %02x)\n", dev->class, dev->hdr_type); dev->class = PCI_CLASS_NOT_DEFINED << 8; } /* We found a fine healthy device, go go go... */ return 0; } static void pci_configure_mps(struct pci_dev *dev) { struct pci_dev *bridge = pci_upstream_bridge(dev); int mps, p_mps, rc; if (!pci_is_pcie(dev) || !bridge || !pci_is_pcie(bridge)) return; mps = pcie_get_mps(dev); p_mps = pcie_get_mps(bridge); if (mps == p_mps) return; if (pcie_bus_config == PCIE_BUS_TUNE_OFF) { dev_warn(&dev->dev, "Max Payload Size %d, but upstream %s set to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n", mps, pci_name(bridge), p_mps); return; } /* * Fancier MPS configuration is done later by * pcie_bus_configure_settings() */ if (pcie_bus_config != PCIE_BUS_DEFAULT) return; rc = pcie_set_mps(dev, p_mps); if (rc) { dev_warn(&dev->dev, "can't set Max Payload Size to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n", p_mps); return; } dev_info(&dev->dev, "Max Payload Size set to %d (was %d, max %d)\n", p_mps, mps, 128 << dev->pcie_mpss); } static struct hpp_type0 pci_default_type0 = { .revision = 1, .cache_line_size = 8, .latency_timer = 0x40, .enable_serr = 0, .enable_perr = 0, }; static void program_hpp_type0(struct pci_dev *dev, struct hpp_type0 *hpp) { u16 pci_cmd, pci_bctl; if (!hpp) hpp = &pci_default_type0; if (hpp->revision > 1) { dev_warn(&dev->dev, "PCI settings rev %d not supported; using defaults\n", hpp->revision); hpp = &pci_default_type0; } pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp->cache_line_size); pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp->latency_timer); pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); if (hpp->enable_serr) pci_cmd |= PCI_COMMAND_SERR; if (hpp->enable_perr) pci_cmd |= PCI_COMMAND_PARITY; pci_write_config_word(dev, PCI_COMMAND, pci_cmd); /* Program bridge control value */ if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, hpp->latency_timer); pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); if (hpp->enable_serr) pci_bctl |= PCI_BRIDGE_CTL_SERR; if (hpp->enable_perr) pci_bctl |= PCI_BRIDGE_CTL_PARITY; pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); } } static void program_hpp_type1(struct pci_dev *dev, struct hpp_type1 *hpp) { if (hpp) dev_warn(&dev->dev, "PCI-X settings not supported\n"); } static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp) { int pos; u32 reg32; if (!hpp) return; if (hpp->revision > 1) { dev_warn(&dev->dev, "PCIe settings rev %d not supported\n", hpp->revision); return; } /* * Don't allow _HPX to change MPS or MRRS settings. We manage * those to make sure they're consistent with the rest of the * platform. */ hpp->pci_exp_devctl_and |= PCI_EXP_DEVCTL_PAYLOAD | PCI_EXP_DEVCTL_READRQ; hpp->pci_exp_devctl_or &= ~(PCI_EXP_DEVCTL_PAYLOAD | PCI_EXP_DEVCTL_READRQ); /* Initialize Device Control Register */ pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL, ~hpp->pci_exp_devctl_and, hpp->pci_exp_devctl_or); /* Initialize Link Control Register */ if (pcie_cap_has_lnkctl(dev)) pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL, ~hpp->pci_exp_lnkctl_and, hpp->pci_exp_lnkctl_or); /* Find Advanced Error Reporting Enhanced Capability */ pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); if (!pos) return; /* Initialize Uncorrectable Error Mask Register */ pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, ®32); reg32 = (reg32 & hpp->unc_err_mask_and) | hpp->unc_err_mask_or; pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32); /* Initialize Uncorrectable Error Severity Register */ pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, ®32); reg32 = (reg32 & hpp->unc_err_sever_and) | hpp->unc_err_sever_or; pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32); /* Initialize Correctable Error Mask Register */ pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®32); reg32 = (reg32 & hpp->cor_err_mask_and) | hpp->cor_err_mask_or; pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32); /* Initialize Advanced Error Capabilities and Control Register */ pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32); reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or; pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32); /* * FIXME: The following two registers are not supported yet. * * o Secondary Uncorrectable Error Severity Register * o Secondary Uncorrectable Error Mask Register */ } static void pci_configure_device(struct pci_dev *dev) { struct hotplug_params hpp; int ret; pci_configure_mps(dev); memset(&hpp, 0, sizeof(hpp)); ret = pci_get_hp_params(dev, &hpp); if (ret) return; program_hpp_type2(dev, hpp.t2); program_hpp_type1(dev, hpp.t1); program_hpp_type0(dev, hpp.t0); } static void pci_release_capabilities(struct pci_dev *dev) { pci_vpd_release(dev); pci_iov_release(dev); pci_free_cap_save_buffers(dev); } /** * pci_release_dev - free a pci device structure when all users of it are finished. * @dev: device that's been disconnected * * Will be called only by the device core when all users of this pci device are * done. */ static void pci_release_dev(struct device *dev) { struct pci_dev *pci_dev; pci_dev = to_pci_dev(dev); pci_release_capabilities(pci_dev); pci_release_of_node(pci_dev); pcibios_release_device(pci_dev); pci_bus_put(pci_dev->bus); kfree(pci_dev->driver_override); kfree(pci_dev); } struct pci_dev *pci_alloc_dev(struct pci_bus *bus) { struct pci_dev *dev; dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); if (!dev) return NULL; INIT_LIST_HEAD(&dev->bus_list); dev->dev.type = &pci_dev_type; dev->bus = pci_bus_get(bus); return dev; } EXPORT_SYMBOL(pci_alloc_dev); bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l, int crs_timeout) { int delay = 1; if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) return false; /* some broken boards return 0 or ~0 if a slot is empty: */ if (*l == 0xffffffff || *l == 0x00000000 || *l == 0x0000ffff || *l == 0xffff0000) return false; /* * Configuration Request Retry Status. Some root ports return the * actual device ID instead of the synthetic ID (0xFFFF) required * by the PCIe spec. Ignore the device ID and only check for * (vendor id == 1). */ while ((*l & 0xffff) == 0x0001) { if (!crs_timeout) return false; msleep(delay); delay *= 2; if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) return false; /* Card hasn't responded in 60 seconds? Must be stuck. */ if (delay > crs_timeout) { printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not responding\n", pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn)); return false; } } return true; } EXPORT_SYMBOL(pci_bus_read_dev_vendor_id); /* * Read the config data for a PCI device, sanity-check it * and fill in the dev structure... */ static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) { struct pci_dev *dev; u32 l; if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000)) return NULL; dev = pci_alloc_dev(bus); if (!dev) return NULL; dev->devfn = devfn; dev->vendor = l & 0xffff; dev->device = (l >> 16) & 0xffff; pci_set_of_node(dev); if (pci_setup_device(dev)) { pci_bus_put(dev->bus); kfree(dev); return NULL; } return dev; } static void pci_init_capabilities(struct pci_dev *dev) { /* Enhanced Allocation */ pci_ea_init(dev); /* MSI/MSI-X list */ pci_msi_init_pci_dev(dev); /* Buffers for saving PCIe and PCI-X capabilities */ pci_allocate_cap_save_buffers(dev); /* Power Management */ pci_pm_init(dev); /* Vital Product Data */ pci_vpd_pci22_init(dev); /* Alternative Routing-ID Forwarding */ pci_configure_ari(dev); /* Single Root I/O Virtualization */ pci_iov_init(dev); /* Address Translation Services */ pci_ats_init(dev); /* Enable ACS P2P upstream forwarding */ pci_enable_acs(dev); pci_cleanup_aer_error_status_regs(dev); } /* * This is the equivalent of pci_host_bridge_msi_domain that acts on * devices. Firmware interfaces that can select the MSI domain on a * per-device basis should be called from here. */ static struct irq_domain *pci_dev_msi_domain(struct pci_dev *dev) { struct irq_domain *d; /* * If a domain has been set through the pcibios_add_device * callback, then this is the one (platform code knows best). */ d = dev_get_msi_domain(&dev->dev); if (d) return d; /* * Let's see if we have a firmware interface able to provide * the domain. */ d = pci_msi_get_device_domain(dev); if (d) return d; return NULL; } static void pci_set_msi_domain(struct pci_dev *dev) { struct irq_domain *d; /* * If the platform or firmware interfaces cannot supply a * device-specific MSI domain, then inherit the default domain * from the host bridge itself. */ d = pci_dev_msi_domain(dev); if (!d) d = dev_get_msi_domain(&dev->bus->dev); dev_set_msi_domain(&dev->dev, d); } /** * pci_dma_configure - Setup DMA configuration * @dev: ptr to pci_dev struct of the PCI device * * Function to update PCI devices's DMA configuration using the same * info from the OF node or ACPI node of host bridge's parent (if any). */ static void pci_dma_configure(struct pci_dev *dev) { struct device *bridge = pci_get_host_bridge_device(dev); if (IS_ENABLED(CONFIG_OF) && bridge->parent && bridge->parent->of_node) { of_dma_configure(&dev->dev, bridge->parent->of_node); } else if (has_acpi_companion(bridge)) { struct acpi_device *adev = to_acpi_device_node(bridge->fwnode); enum dev_dma_attr attr = acpi_get_dma_attr(adev); if (attr == DEV_DMA_NOT_SUPPORTED) dev_warn(&dev->dev, "DMA not supported.\n"); else arch_setup_dma_ops(&dev->dev, 0, 0, NULL, attr == DEV_DMA_COHERENT); } pci_put_host_bridge_device(bridge); } void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) { int ret; pci_configure_device(dev); device_initialize(&dev->dev); dev->dev.release = pci_release_dev; set_dev_node(&dev->dev, pcibus_to_node(bus)); dev->dev.dma_mask = &dev->dma_mask; dev->dev.dma_parms = &dev->dma_parms; dev->dev.coherent_dma_mask = 0xffffffffull; pci_dma_configure(dev); pci_set_dma_max_seg_size(dev, 65536); pci_set_dma_seg_boundary(dev, 0xffffffff); /* Fix up broken headers */ pci_fixup_device(pci_fixup_header, dev); /* moved out from quirk header fixup code */ pci_reassigndev_resource_alignment(dev); /* Clear the state_saved flag. */ dev->state_saved = false; /* Initialize various capabilities */ pci_init_capabilities(dev); /* * Add the device to our list of discovered devices * and the bus list for fixup functions, etc. */ down_write(&pci_bus_sem); list_add_tail(&dev->bus_list, &bus->devices); up_write(&pci_bus_sem); ret = pcibios_add_device(dev); WARN_ON(ret < 0); /* Setup MSI irq domain */ pci_set_msi_domain(dev); /* Notifier could use PCI capabilities */ dev->match_driver = false; ret = device_add(&dev->dev); WARN_ON(ret < 0); } struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn) { struct pci_dev *dev; dev = pci_get_slot(bus, devfn); if (dev) { pci_dev_put(dev); return dev; } dev = pci_scan_device(bus, devfn); if (!dev) return NULL; pci_device_add(dev, bus); return dev; } EXPORT_SYMBOL(pci_scan_single_device); static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn) { int pos; u16 cap = 0; unsigned next_fn; if (pci_ari_enabled(bus)) { if (!dev) return 0; pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI); if (!pos) return 0; pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap); next_fn = PCI_ARI_CAP_NFN(cap); if (next_fn <= fn) return 0; /* protect against malformed list */ return next_fn; } /* dev may be NULL for non-contiguous multifunction devices */ if (!dev || dev->multifunction) return (fn + 1) % 8; return 0; } static int only_one_child(struct pci_bus *bus) { struct pci_dev *parent = bus->self; if (!parent || !pci_is_pcie(parent)) return 0; if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT) return 1; if (parent->has_secondary_link && !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS)) return 1; return 0; } /** * pci_scan_slot - scan a PCI slot on a bus for devices. * @bus: PCI bus to scan * @devfn: slot number to scan (must have zero function.) * * Scan a PCI slot on the specified PCI bus for devices, adding * discovered devices to the @bus->devices list. New devices * will not have is_added set. * * Returns the number of new devices found. */ int pci_scan_slot(struct pci_bus *bus, int devfn) { unsigned fn, nr = 0; struct pci_dev *dev; if (only_one_child(bus) && (devfn > 0)) return 0; /* Already scanned the entire slot */ dev = pci_scan_single_device(bus, devfn); if (!dev) return 0; if (!dev->is_added) nr++; for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) { dev = pci_scan_single_device(bus, devfn + fn); if (dev) { if (!dev->is_added) nr++; dev->multifunction = 1; } } /* only one slot has pcie device */ if (bus->self && nr) pcie_aspm_init_link_state(bus->self); return nr; } EXPORT_SYMBOL(pci_scan_slot); static int pcie_find_smpss(struct pci_dev *dev, void *data) { u8 *smpss = data; if (!pci_is_pcie(dev)) return 0; /* * We don't have a way to change MPS settings on devices that have * drivers attached. A hot-added device might support only the minimum * MPS setting (MPS=128). Therefore, if the fabric contains a bridge * where devices may be hot-added, we limit the fabric MPS to 128 so * hot-added devices will work correctly. * * However, if we hot-add a device to a slot directly below a Root * Port, it's impossible for there to be other existing devices below * the port. We don't limit the MPS in this case because we can * reconfigure MPS on both the Root Port and the hot-added device, * and there are no other devices involved. * * Note that this PCIE_BUS_SAFE path assumes no peer-to-peer DMA. */ if (dev->is_hotplug_bridge && pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) *smpss = 0; if (*smpss > dev->pcie_mpss) *smpss = dev->pcie_mpss; return 0; } static void pcie_write_mps(struct pci_dev *dev, int mps) { int rc; if (pcie_bus_config == PCIE_BUS_PERFORMANCE) { mps = 128 << dev->pcie_mpss; if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT && dev->bus->self) /* For "Performance", the assumption is made that * downstream communication will never be larger than * the MRRS. So, the MPS only needs to be configured * for the upstream communication. This being the case, * walk from the top down and set the MPS of the child * to that of the parent bus. * * Configure the device MPS with the smaller of the * device MPSS or the bridge MPS (which is assumed to be * properly configured at this point to the largest * allowable MPS based on its parent bus). */ mps = min(mps, pcie_get_mps(dev->bus->self)); } rc = pcie_set_mps(dev, mps); if (rc) dev_err(&dev->dev, "Failed attempting to set the MPS\n"); } static void pcie_write_mrrs(struct pci_dev *dev) { int rc, mrrs; /* In the "safe" case, do not configure the MRRS. There appear to be * issues with setting MRRS to 0 on a number of devices. */ if (pcie_bus_config != PCIE_BUS_PERFORMANCE) return; /* For Max performance, the MRRS must be set to the largest supported * value. However, it cannot be configured larger than the MPS the * device or the bus can support. This should already be properly * configured by a prior call to pcie_write_mps. */ mrrs = pcie_get_mps(dev); /* MRRS is a R/W register. Invalid values can be written, but a * subsequent read will verify if the value is acceptable or not. * If the MRRS value provided is not acceptable (e.g., too large), * shrink the value until it is acceptable to the HW. */ while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) { rc = pcie_set_readrq(dev, mrrs); if (!rc) break; dev_warn(&dev->dev, "Failed attempting to set the MRRS\n"); mrrs /= 2; } if (mrrs < 128) dev_err(&dev->dev, "MRRS was unable to be configured with a safe value. If problems are experienced, try running with pci=pcie_bus_safe\n"); } static int pcie_bus_configure_set(struct pci_dev *dev, void *data) { int mps, orig_mps; if (!pci_is_pcie(dev)) return 0; if (pcie_bus_config == PCIE_BUS_TUNE_OFF || pcie_bus_config == PCIE_BUS_DEFAULT) return 0; mps = 128 << *(u8 *)data; orig_mps = pcie_get_mps(dev); pcie_write_mps(dev, mps); pcie_write_mrrs(dev); dev_info(&dev->dev, "Max Payload Size set to %4d/%4d (was %4d), Max Read Rq %4d\n", pcie_get_mps(dev), 128 << dev->pcie_mpss, orig_mps, pcie_get_readrq(dev)); return 0; } /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down, * parents then children fashion. If this changes, then this code will not * work as designed. */ void pcie_bus_configure_settings(struct pci_bus *bus) { u8 smpss = 0; if (!bus->self) return; if (!pci_is_pcie(bus->self)) return; /* FIXME - Peer to peer DMA is possible, though the endpoint would need * to be aware of the MPS of the destination. To work around this, * simply force the MPS of the entire system to the smallest possible. */ if (pcie_bus_config == PCIE_BUS_PEER2PEER) smpss = 0; if (pcie_bus_config == PCIE_BUS_SAFE) { smpss = bus->self->pcie_mpss; pcie_find_smpss(bus->self, &smpss); pci_walk_bus(bus, pcie_find_smpss, &smpss); } pcie_bus_configure_set(bus->self, &smpss); pci_walk_bus(bus, pcie_bus_configure_set, &smpss); } EXPORT_SYMBOL_GPL(pcie_bus_configure_settings); unsigned int pci_scan_child_bus(struct pci_bus *bus) { unsigned int devfn, pass, max = bus->busn_res.start; struct pci_dev *dev; dev_dbg(&bus->dev, "scanning bus\n"); /* Go find them, Rover! */ for (devfn = 0; devfn < 0x100; devfn += 8) pci_scan_slot(bus, devfn); /* Reserve buses for SR-IOV capability. */ max += pci_iov_bus_range(bus); /* * After performing arch-dependent fixup of the bus, look behind * all PCI-to-PCI bridges on this bus. */ if (!bus->is_added) { dev_dbg(&bus->dev, "fixups for bus\n"); pcibios_fixup_bus(bus); bus->is_added = 1; } for (pass = 0; pass < 2; pass++) list_for_each_entry(dev, &bus->devices, bus_list) { if (pci_is_bridge(dev)) max = pci_scan_bridge(bus, dev, max, pass); } /* * We've scanned the bus and so we know all about what's on * the other side of any bridges that may be on this bus plus * any devices. * * Return how far we've got finding sub-buses. */ dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max); return max; } EXPORT_SYMBOL_GPL(pci_scan_child_bus); /** * pcibios_root_bridge_prepare - Platform-specific host bridge setup. * @bridge: Host bridge to set up. * * Default empty implementation. Replace with an architecture-specific setup * routine, if necessary. */ int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) { return 0; } void __weak pcibios_add_bus(struct pci_bus *bus) { } void __weak pcibios_remove_bus(struct pci_bus *bus) { } struct pci_bus *pci_create_root_bus(struct device *parent, int bus, struct pci_ops *ops, void *sysdata, struct list_head *resources) { int error; struct pci_host_bridge *bridge; struct pci_bus *b, *b2; struct resource_entry *window, *n; struct resource *res; resource_size_t offset; char bus_addr[64]; char *fmt; b = pci_alloc_bus(NULL); if (!b) return NULL; b->sysdata = sysdata; b->ops = ops; b->number = b->busn_res.start = bus; pci_bus_assign_domain_nr(b, parent); b2 = pci_find_bus(pci_domain_nr(b), bus); if (b2) { /* If we already got to this bus through a different bridge, ignore it */ dev_dbg(&b2->dev, "bus already known\n"); goto err_out; } bridge = pci_alloc_host_bridge(b); if (!bridge) goto err_out; bridge->dev.parent = parent; bridge->dev.release = pci_release_host_bridge_dev; dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); error = pcibios_root_bridge_prepare(bridge); if (error) { kfree(bridge); goto err_out; } error = device_register(&bridge->dev); if (error) { put_device(&bridge->dev); goto err_out; } b->bridge = get_device(&bridge->dev); device_enable_async_suspend(b->bridge); pci_set_bus_of_node(b); pci_set_bus_msi_domain(b); if (!parent) set_dev_node(b->bridge, pcibus_to_node(b)); b->dev.class = &pcibus_class; b->dev.parent = b->bridge; dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus); error = device_register(&b->dev); if (error) goto class_dev_reg_err; pcibios_add_bus(b); /* Create legacy_io and legacy_mem files for this bus */ pci_create_legacy_files(b); if (parent) dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev)); else printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev)); /* Add initial resources to the bus */ resource_list_for_each_entry_safe(window, n, resources) { list_move_tail(&window->node, &bridge->windows); res = window->res; offset = window->offset; if (res->flags & IORESOURCE_BUS) pci_bus_insert_busn_res(b, bus, res->end); else pci_bus_add_resource(b, res, 0); if (offset) { if (resource_type(res) == IORESOURCE_IO) fmt = " (bus address [%#06llx-%#06llx])"; else fmt = " (bus address [%#010llx-%#010llx])"; snprintf(bus_addr, sizeof(bus_addr), fmt, (unsigned long long) (res->start - offset), (unsigned long long) (res->end - offset)); } else bus_addr[0] = '\0'; dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr); } down_write(&pci_bus_sem); list_add_tail(&b->node, &pci_root_buses); up_write(&pci_bus_sem); return b; class_dev_reg_err: put_device(&bridge->dev); device_unregister(&bridge->dev); err_out: kfree(b); return NULL; } EXPORT_SYMBOL_GPL(pci_create_root_bus); int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max) { struct resource *res = &b->busn_res; struct resource *parent_res, *conflict; res->start = bus; res->end = bus_max; res->flags = IORESOURCE_BUS; if (!pci_is_root_bus(b)) parent_res = &b->parent->busn_res; else { parent_res = get_pci_domain_busn_res(pci_domain_nr(b)); res->flags |= IORESOURCE_PCI_FIXED; } conflict = request_resource_conflict(parent_res, res); if (conflict) dev_printk(KERN_DEBUG, &b->dev, "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n", res, pci_is_root_bus(b) ? "domain " : "", parent_res, conflict->name, conflict); return conflict == NULL; } int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max) { struct resource *res = &b->busn_res; struct resource old_res = *res; resource_size_t size; int ret; if (res->start > bus_max) return -EINVAL; size = bus_max - res->start + 1; ret = adjust_resource(res, res->start, size); dev_printk(KERN_DEBUG, &b->dev, "busn_res: %pR end %s updated to %02x\n", &old_res, ret ? "can not be" : "is", bus_max); if (!ret && !res->parent) pci_bus_insert_busn_res(b, res->start, res->end); return ret; } void pci_bus_release_busn_res(struct pci_bus *b) { struct resource *res = &b->busn_res; int ret; if (!res->flags || !res->parent) return; ret = release_resource(res); dev_printk(KERN_DEBUG, &b->dev, "busn_res: %pR %s released\n", res, ret ? "can not be" : "is"); } struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus, struct pci_ops *ops, void *sysdata, struct list_head *resources, struct msi_controller *msi) { struct resource_entry *window; bool found = false; struct pci_bus *b; int max; resource_list_for_each_entry(window, resources) if (window->res->flags & IORESOURCE_BUS) { found = true; break; } b = pci_create_root_bus(parent, bus, ops, sysdata, resources); if (!b) return NULL; b->msi = msi; if (!found) { dev_info(&b->dev, "No busn resource found for root bus, will use [bus %02x-ff]\n", bus); pci_bus_insert_busn_res(b, bus, 255); } max = pci_scan_child_bus(b); if (!found) pci_bus_update_busn_res_end(b, max); return b; } struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, struct pci_ops *ops, void *sysdata, struct list_head *resources) { return pci_scan_root_bus_msi(parent, bus, ops, sysdata, resources, NULL); } EXPORT_SYMBOL(pci_scan_root_bus); struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata) { LIST_HEAD(resources); struct pci_bus *b; pci_add_resource(&resources, &ioport_resource); pci_add_resource(&resources, &iomem_resource); pci_add_resource(&resources, &busn_resource); b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources); if (b) { pci_scan_child_bus(b); } else { pci_free_resource_list(&resources); } return b; } EXPORT_SYMBOL(pci_scan_bus); /** * pci_rescan_bus_bridge_resize - scan a PCI bus for devices. * @bridge: PCI bridge for the bus to scan * * Scan a PCI bus and child buses for new devices, add them, * and enable them, resizing bridge mmio/io resource if necessary * and possible. The caller must ensure the child devices are already * removed for resizing to occur. * * Returns the max number of subordinate bus discovered. */ unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge) { unsigned int max; struct pci_bus *bus = bridge->subordinate; max = pci_scan_child_bus(bus); pci_assign_unassigned_bridge_resources(bridge); pci_bus_add_devices(bus); return max; } /** * pci_rescan_bus - scan a PCI bus for devices. * @bus: PCI bus to scan * * Scan a PCI bus and child buses for new devices, adds them, * and enables them. * * Returns the max number of subordinate bus discovered. */ unsigned int pci_rescan_bus(struct pci_bus *bus) { unsigned int max; max = pci_scan_child_bus(bus); pci_assign_unassigned_bus_resources(bus); pci_bus_add_devices(bus); return max; } EXPORT_SYMBOL_GPL(pci_rescan_bus); /* * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal * routines should always be executed under this mutex. */ static DEFINE_MUTEX(pci_rescan_remove_lock); void pci_lock_rescan_remove(void) { mutex_lock(&pci_rescan_remove_lock); } EXPORT_SYMBOL_GPL(pci_lock_rescan_remove); void pci_unlock_rescan_remove(void) { mutex_unlock(&pci_rescan_remove_lock); } EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove); static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b) { const struct pci_dev *a = to_pci_dev(d_a); const struct pci_dev *b = to_pci_dev(d_b); if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; if (a->bus->number < b->bus->number) return -1; else if (a->bus->number > b->bus->number) return 1; if (a->devfn < b->devfn) return -1; else if (a->devfn > b->devfn) return 1; return 0; } void __init pci_sort_breadthfirst(void) { bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp); }