| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * PCI detection and setup code |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/delay.h> |
| #include <linux/init.h> |
| #include <linux/pci.h> |
| #include <linux/msi.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/aer.h> |
| #include <linux/acpi.h> |
| #include <linux/hypervisor.h> |
| #include <linux/irqdomain.h> |
| #include <linux/pm_runtime.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; |
| } |
| |
| /* |
| * 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_next_device(&pci_bus_type, NULL); |
| 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); |
| |
| /* |
| * base == maxbase can be valid only if the BAR has already been |
| * programmed with all 1s. |
| */ |
| if (base == maxbase && ((base | (size - 1)) & 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 = 0, sz = 0, 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 { |
| if (l & PCI_ROM_ADDRESS_ENABLE) |
| res->flags |= IORESOURCE_ROM_ENABLE; |
| l64 = l & PCI_ROM_ADDRESS_MASK; |
| sz64 = sz & PCI_ROM_ADDRESS_MASK; |
| mask64 = 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) { |
| pci_info(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; |
| pci_err(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 - 1; |
| pci_info(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 - 1; |
| |
| 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; |
| pci_info(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) |
| pci_info(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; |
| |
| if (dev->non_compliant_bars) |
| return; |
| |
| /* Per PCIe r4.0, sec 9.3.4.1.11, the VF BARs are all RO Zero */ |
| if (dev->is_virtfn) |
| return; |
| |
| 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_windows(struct pci_dev *bridge) |
| { |
| u16 io; |
| u32 pmem, tmp; |
| |
| pci_read_config_word(bridge, PCI_IO_BASE, &io); |
| if (!io) { |
| pci_write_config_word(bridge, PCI_IO_BASE, 0xe0f0); |
| pci_read_config_word(bridge, PCI_IO_BASE, &io); |
| pci_write_config_word(bridge, PCI_IO_BASE, 0x0); |
| } |
| if (io) |
| bridge->io_window = 1; |
| |
| /* |
| * DECchip 21050 pass 2 errata: the bridge may miss an address |
| * disconnect boundary by one PCI data phase. Workaround: do not |
| * use prefetching on this device. |
| */ |
| if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001) |
| return; |
| |
| pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem); |
| if (!pmem) { |
| pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, |
| 0xffe0fff0); |
| pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem); |
| pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0); |
| } |
| if (!pmem) |
| return; |
| |
| bridge->pref_window = 1; |
| |
| if ((pmem & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { |
| |
| /* |
| * Bridge claims to have a 64-bit prefetchable memory |
| * window; verify that the upper bits are actually |
| * writable. |
| */ |
| pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &pmem); |
| pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, |
| 0xffffffff); |
| pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp); |
| pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, pmem); |
| if (tmp) |
| bridge->pref_64_window = 1; |
| } |
| } |
| |
| 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); |
| pci_info(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); |
| pci_info(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) { |
| pci_err(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); |
| pci_info(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; |
| |
| pci_info(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); |
| pci_info(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); |
| pci_free_resource_list(&bridge->dma_ranges); |
| kfree(bridge); |
| } |
| |
| static void pci_init_host_bridge(struct pci_host_bridge *bridge) |
| { |
| INIT_LIST_HEAD(&bridge->windows); |
| INIT_LIST_HEAD(&bridge->dma_ranges); |
| |
| /* |
| * We assume we can manage these PCIe features. Some systems may |
| * reserve these for use by the platform itself, e.g., an ACPI BIOS |
| * may implement its own AER handling and use _OSC to prevent the |
| * OS from interfering. |
| */ |
| bridge->native_aer = 1; |
| bridge->native_pcie_hotplug = 1; |
| bridge->native_shpc_hotplug = 1; |
| bridge->native_pme = 1; |
| bridge->native_ltr = 1; |
| bridge->native_dpc = 1; |
| |
| device_initialize(&bridge->dev); |
| } |
| |
| struct pci_host_bridge *pci_alloc_host_bridge(size_t priv) |
| { |
| struct pci_host_bridge *bridge; |
| |
| bridge = kzalloc(sizeof(*bridge) + priv, GFP_KERNEL); |
| if (!bridge) |
| return NULL; |
| |
| pci_init_host_bridge(bridge); |
| bridge->dev.release = pci_release_host_bridge_dev; |
| |
| return bridge; |
| } |
| EXPORT_SYMBOL(pci_alloc_host_bridge); |
| |
| static void devm_pci_alloc_host_bridge_release(void *data) |
| { |
| pci_free_host_bridge(data); |
| } |
| |
| struct pci_host_bridge *devm_pci_alloc_host_bridge(struct device *dev, |
| size_t priv) |
| { |
| int ret; |
| struct pci_host_bridge *bridge; |
| |
| bridge = pci_alloc_host_bridge(priv); |
| if (!bridge) |
| return NULL; |
| |
| bridge->dev.parent = dev; |
| |
| ret = devm_add_action_or_reset(dev, devm_pci_alloc_host_bridge_release, |
| bridge); |
| if (ret) |
| return NULL; |
| |
| ret = devm_of_pci_bridge_init(dev, bridge); |
| if (ret) |
| return NULL; |
| |
| return bridge; |
| } |
| EXPORT_SYMBOL(devm_pci_alloc_host_bridge); |
| |
| void pci_free_host_bridge(struct pci_host_bridge *bridge) |
| { |
| put_device(&bridge->dev); |
| } |
| EXPORT_SYMBOL(pci_free_host_bridge); |
| |
| /* Indexed by PCI_X_SSTATUS_FREQ (secondary bus mode and frequency) */ |
| 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 */ |
| }; |
| |
| /* Indexed by PCI_EXP_LNKCAP_SLS, PCI_EXP_LNKSTA_CLS */ |
| 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 */ |
| PCIE_SPEED_16_0GT, /* 4 */ |
| PCIE_SPEED_32_0GT, /* 5 */ |
| PCIE_SPEED_64_0GT, /* 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 */ |
| }; |
| EXPORT_SYMBOL_GPL(pcie_link_speed); |
| |
| const char *pci_speed_string(enum pci_bus_speed speed) |
| { |
| /* Indexed by the pci_bus_speed enum */ |
| static const char *speed_strings[] = { |
| "33 MHz PCI", /* 0x00 */ |
| "66 MHz PCI", /* 0x01 */ |
| "66 MHz PCI-X", /* 0x02 */ |
| "100 MHz PCI-X", /* 0x03 */ |
| "133 MHz PCI-X", /* 0x04 */ |
| NULL, /* 0x05 */ |
| NULL, /* 0x06 */ |
| NULL, /* 0x07 */ |
| NULL, /* 0x08 */ |
| "66 MHz PCI-X 266", /* 0x09 */ |
| "100 MHz PCI-X 266", /* 0x0a */ |
| "133 MHz PCI-X 266", /* 0x0b */ |
| "Unknown AGP", /* 0x0c */ |
| "1x AGP", /* 0x0d */ |
| "2x AGP", /* 0x0e */ |
| "4x AGP", /* 0x0f */ |
| "8x AGP", /* 0x10 */ |
| "66 MHz PCI-X 533", /* 0x11 */ |
| "100 MHz PCI-X 533", /* 0x12 */ |
| "133 MHz PCI-X 533", /* 0x13 */ |
| "2.5 GT/s PCIe", /* 0x14 */ |
| "5.0 GT/s PCIe", /* 0x15 */ |
| "8.0 GT/s PCIe", /* 0x16 */ |
| "16.0 GT/s PCIe", /* 0x17 */ |
| "32.0 GT/s PCIe", /* 0x18 */ |
| "64.0 GT/s PCIe", /* 0x19 */ |
| }; |
| |
| if (speed < ARRAY_SIZE(speed_strings)) |
| return speed_strings[speed]; |
| return "Unknown"; |
| } |
| EXPORT_SYMBOL_GPL(pci_speed_string); |
| |
| 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]; |
| bridge->link_active_reporting = !!(linkcap & PCI_EXP_LNKCAP_DLLLARC); |
| |
| 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); |
| if (!d) |
| d = pci_host_bridge_acpi_msi_domain(bus); |
| |
| #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN |
| /* |
| * If no IRQ domain was found via the OF tree, try looking it up |
| * directly through the fwnode_handle. |
| */ |
| if (!d) { |
| struct fwnode_handle *fwnode = pci_root_bus_fwnode(bus); |
| |
| if (fwnode) |
| d = irq_find_matching_fwnode(fwnode, |
| DOMAIN_BUS_PCI_MSI); |
| } |
| #endif |
| |
| 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 int pci_register_host_bridge(struct pci_host_bridge *bridge) |
| { |
| struct device *parent = bridge->dev.parent; |
| struct resource_entry *window, *n; |
| struct pci_bus *bus, *b; |
| resource_size_t offset; |
| LIST_HEAD(resources); |
| struct resource *res; |
| char addr[64], *fmt; |
| const char *name; |
| int err; |
| |
| bus = pci_alloc_bus(NULL); |
| if (!bus) |
| return -ENOMEM; |
| |
| bridge->bus = bus; |
| |
| /* Temporarily move resources off the list */ |
| list_splice_init(&bridge->windows, &resources); |
| bus->sysdata = bridge->sysdata; |
| bus->ops = bridge->ops; |
| bus->number = bus->busn_res.start = bridge->busnr; |
| #ifdef CONFIG_PCI_DOMAINS_GENERIC |
| bus->domain_nr = pci_bus_find_domain_nr(bus, parent); |
| #endif |
| |
| b = pci_find_bus(pci_domain_nr(bus), bridge->busnr); |
| if (b) { |
| /* Ignore it if we already got here via a different bridge */ |
| dev_dbg(&b->dev, "bus already known\n"); |
| err = -EEXIST; |
| goto free; |
| } |
| |
| dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(bus), |
| bridge->busnr); |
| |
| err = pcibios_root_bridge_prepare(bridge); |
| if (err) |
| goto free; |
| |
| err = device_add(&bridge->dev); |
| if (err) { |
| put_device(&bridge->dev); |
| goto free; |
| } |
| bus->bridge = get_device(&bridge->dev); |
| device_enable_async_suspend(bus->bridge); |
| pci_set_bus_of_node(bus); |
| pci_set_bus_msi_domain(bus); |
| if (bridge->msi_domain && !dev_get_msi_domain(&bus->dev) && |
| !pci_host_of_has_msi_map(parent)) |
| bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI; |
| |
| if (!parent) |
| set_dev_node(bus->bridge, pcibus_to_node(bus)); |
| |
| bus->dev.class = &pcibus_class; |
| bus->dev.parent = bus->bridge; |
| |
| dev_set_name(&bus->dev, "%04x:%02x", pci_domain_nr(bus), bus->number); |
| name = dev_name(&bus->dev); |
| |
| err = device_register(&bus->dev); |
| if (err) |
| goto unregister; |
| |
| pcibios_add_bus(bus); |
| |
| if (bus->ops->add_bus) { |
| err = bus->ops->add_bus(bus); |
| if (WARN_ON(err < 0)) |
| dev_err(&bus->dev, "failed to add bus: %d\n", err); |
| } |
| |
| /* Create legacy_io and legacy_mem files for this bus */ |
| pci_create_legacy_files(bus); |
| |
| if (parent) |
| dev_info(parent, "PCI host bridge to bus %s\n", name); |
| else |
| pr_info("PCI host bridge to bus %s\n", name); |
| |
| if (nr_node_ids > 1 && pcibus_to_node(bus) == NUMA_NO_NODE) |
| dev_warn(&bus->dev, "Unknown NUMA node; performance will be reduced\n"); |
| |
| /* Add initial resources to the bus */ |
| resource_list_for_each_entry_safe(window, n, &resources) { |
| list_move_tail(&window->node, &bridge->windows); |
| offset = window->offset; |
| res = window->res; |
| |
| if (res->flags & IORESOURCE_BUS) |
| pci_bus_insert_busn_res(bus, bus->number, res->end); |
| else |
| pci_bus_add_resource(bus, res, 0); |
| |
| if (offset) { |
| if (resource_type(res) == IORESOURCE_IO) |
| fmt = " (bus address [%#06llx-%#06llx])"; |
| else |
| fmt = " (bus address [%#010llx-%#010llx])"; |
| |
| snprintf(addr, sizeof(addr), fmt, |
| (unsigned long long)(res->start - offset), |
| (unsigned long long)(res->end - offset)); |
| } else |
| addr[0] = '\0'; |
| |
| dev_info(&bus->dev, "root bus resource %pR%s\n", res, addr); |
| } |
| |
| down_write(&pci_bus_sem); |
| list_add_tail(&bus->node, &pci_root_buses); |
| up_write(&pci_bus_sem); |
| |
| return 0; |
| |
| unregister: |
| put_device(&bridge->dev); |
| device_del(&bridge->dev); |
| |
| free: |
| kfree(bus); |
| return err; |
| } |
| |
| static bool pci_bridge_child_ext_cfg_accessible(struct pci_dev *bridge) |
| { |
| int pos; |
| u32 status; |
| |
| /* |
| * If extended config space isn't accessible on a bridge's primary |
| * bus, we certainly can't access it on the secondary bus. |
| */ |
| if (bridge->bus->bus_flags & PCI_BUS_FLAGS_NO_EXTCFG) |
| return false; |
| |
| /* |
| * PCIe Root Ports and switch ports are PCIe on both sides, so if |
| * extended config space is accessible on the primary, it's also |
| * accessible on the secondary. |
| */ |
| if (pci_is_pcie(bridge) && |
| (pci_pcie_type(bridge) == PCI_EXP_TYPE_ROOT_PORT || |
| pci_pcie_type(bridge) == PCI_EXP_TYPE_UPSTREAM || |
| pci_pcie_type(bridge) == PCI_EXP_TYPE_DOWNSTREAM)) |
| return true; |
| |
| /* |
| * For the other bridge types: |
| * - PCI-to-PCI bridges |
| * - PCIe-to-PCI/PCI-X forward bridges |
| * - PCI/PCI-X-to-PCIe reverse bridges |
| * extended config space on the secondary side is only accessible |
| * if the bridge supports PCI-X Mode 2. |
| */ |
| pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX); |
| if (!pos) |
| return false; |
| |
| pci_read_config_dword(bridge, pos + PCI_X_STATUS, &status); |
| return status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ); |
| } |
| |
| static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, |
| struct pci_dev *bridge, int busnr) |
| { |
| struct pci_bus *child; |
| struct pci_host_bridge *host; |
| 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->sysdata = parent->sysdata; |
| child->bus_flags = parent->bus_flags; |
| |
| host = pci_find_host_bridge(parent); |
| if (host->child_ops) |
| child->ops = host->child_ops; |
| else |
| child->ops = parent->ops; |
| |
| /* |
| * 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); |
| |
| /* |
| * Check whether extended config space is accessible on the child |
| * bus. Note that we currently assume it is always accessible on |
| * the root bus. |
| */ |
| if (!pci_bridge_child_ext_cfg_accessible(bridge)) { |
| child->bus_flags |= PCI_BUS_FLAGS_NO_EXTCFG; |
| pci_info(child, "extended config space not accessible\n"); |
| } |
| |
| /* 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); |
| |
| if (child->ops->add_bus) { |
| ret = child->ops->add_bus(child); |
| if (WARN_ON(ret < 0)) |
| dev_err(&child->dev, "failed to add bus: %d\n", ret); |
| } |
| |
| /* 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); |
| } |
| |
| static unsigned int pci_scan_child_bus_extend(struct pci_bus *bus, |
| unsigned int available_buses); |
| /** |
| * pci_ea_fixed_busnrs() - Read fixed Secondary and Subordinate bus |
| * numbers from EA capability. |
| * @dev: Bridge |
| * @sec: updated with secondary bus number from EA |
| * @sub: updated with subordinate bus number from EA |
| * |
| * If @dev is a bridge with EA capability that specifies valid secondary |
| * and subordinate bus numbers, return true with the bus numbers in @sec |
| * and @sub. Otherwise return false. |
| */ |
| static bool pci_ea_fixed_busnrs(struct pci_dev *dev, u8 *sec, u8 *sub) |
| { |
| int ea, offset; |
| u32 dw; |
| u8 ea_sec, ea_sub; |
| |
| if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) |
| return false; |
| |
| /* find PCI EA capability in list */ |
| ea = pci_find_capability(dev, PCI_CAP_ID_EA); |
| if (!ea) |
| return false; |
| |
| offset = ea + PCI_EA_FIRST_ENT; |
| pci_read_config_dword(dev, offset, &dw); |
| ea_sec = dw & PCI_EA_SEC_BUS_MASK; |
| ea_sub = (dw & PCI_EA_SUB_BUS_MASK) >> PCI_EA_SUB_BUS_SHIFT; |
| if (ea_sec == 0 || ea_sub < ea_sec) |
| return false; |
| |
| *sec = ea_sec; |
| *sub = ea_sub; |
| return true; |
| } |
| |
| /* |
| * pci_scan_bridge_extend() - Scan buses behind a bridge |
| * @bus: Parent bus the bridge is on |
| * @dev: Bridge itself |
| * @max: Starting subordinate number of buses behind this bridge |
| * @available_buses: Total number of buses available for this bridge and |
| * the devices below. After the minimal bus space has |
| * been allocated the remaining buses will be |
| * distributed equally between hotplug-capable bridges. |
| * @pass: Either %0 (scan already configured bridges) or %1 (scan bridges |
| * that need to be reconfigured. |
| * |
| * 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. |
| * |
| * Return: New subordinate number covering all buses behind this bridge. |
| */ |
| static int pci_scan_bridge_extend(struct pci_bus *bus, struct pci_dev *dev, |
| int max, unsigned int available_buses, |
| 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; |
| bool fixed_buses; |
| u8 fixed_sec, fixed_sub; |
| int next_busnr; |
| |
| /* |
| * Make sure the bridge is powered on to be able to access config |
| * space of devices below it. |
| */ |
| pm_runtime_get_sync(&dev->dev); |
| |
| pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); |
| primary = buses & 0xFF; |
| secondary = (buses >> 8) & 0xFF; |
| subordinate = (buses >> 16) & 0xFF; |
| |
| pci_dbg(dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n", |
| secondary, subordinate, pass); |
| |
| if (!primary && (primary != bus->number) && secondary && subordinate) { |
| pci_warn(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)) { |
| pci_info(dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n", |
| secondary, subordinate); |
| broken = 1; |
| } |
| |
| /* |
| * Disable Master-Abort Mode 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) |
| pci_warn(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); |
| |
| /* Read bus numbers from EA Capability (if present) */ |
| fixed_buses = pci_ea_fixed_busnrs(dev, &fixed_sec, &fixed_sub); |
| if (fixed_buses) |
| next_busnr = fixed_sec; |
| else |
| next_busnr = max + 1; |
| |
| /* |
| * 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), next_busnr); |
| if (!child) { |
| child = pci_add_new_bus(bus, dev, next_busnr); |
| if (!child) |
| goto out; |
| pci_bus_insert_busn_res(child, next_busnr, |
| bus->busn_res.end); |
| } |
| max++; |
| if (available_buses) |
| available_buses--; |
| |
| 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_extend(child, available_buses); |
| } 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 subordinate bus number to its real value. |
| * If fixed subordinate bus number exists from EA |
| * capability then use it. |
| */ |
| if (fixed_buses) |
| max = fixed_sub; |
| 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); |
| |
| /* Check that all devices are accessible */ |
| 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(&dev->dev, "devices behind bridge are unusable because %pR cannot be assigned for them\n", |
| &child->busn_res); |
| break; |
| } |
| bus = bus->parent; |
| } |
| |
| out: |
| pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); |
| |
| pm_runtime_put(&dev->dev); |
| |
| return max; |
| } |
| |
| /* |
| * pci_scan_bridge() - Scan buses behind a bridge |
| * @bus: Parent bus the bridge is on |
| * @dev: Bridge itself |
| * @max: Starting subordinate number of buses behind this bridge |
| * @pass: Either %0 (scan already configured bridges) or %1 (scan bridges |
| * that need to be reconfigured. |
| * |
| * 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. |
| * |
| * Return: New subordinate number covering all buses behind this bridge. |
| */ |
| int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) |
| { |
| return pci_scan_bridge_extend(bus, dev, max, 0, pass); |
| } |
| 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; |
| |
| /* VFs are not allowed to use INTx, so skip the config reads */ |
| if (dev->is_virtfn) { |
| dev->pin = 0; |
| dev->irq = 0; |
| return; |
| } |
| |
| 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; |
| |
| parent = pci_upstream_bridge(pdev); |
| if (!parent) |
| return; |
| |
| /* |
| * Some systems do not identify their upstream/downstream ports |
| * correctly so detect impossible configurations here and correct |
| * the port type accordingly. |
| */ |
| type = pci_pcie_type(pdev); |
| if (type == PCI_EXP_TYPE_DOWNSTREAM) { |
| /* |
| * If pdev claims to be downstream port but the parent |
| * device is also downstream port assume pdev is actually |
| * upstream port. |
| */ |
| if (pcie_downstream_port(parent)) { |
| pci_info(pdev, "claims to be downstream port but is acting as upstream port, correcting type\n"); |
| pdev->pcie_flags_reg &= ~PCI_EXP_FLAGS_TYPE; |
| pdev->pcie_flags_reg |= PCI_EXP_TYPE_UPSTREAM; |
| } |
| } else if (type == PCI_EXP_TYPE_UPSTREAM) { |
| /* |
| * If pdev claims to be upstream port but the parent |
| * device is also upstream port assume pdev is actually |
| * downstream port. |
| */ |
| if (pci_pcie_type(parent) == PCI_EXP_TYPE_UPSTREAM) { |
| pci_info(pdev, "claims to be upstream port but is acting as downstream port, correcting type\n"); |
| pdev->pcie_flags_reg &= ~PCI_EXP_FLAGS_TYPE; |
| pdev->pcie_flags_reg |= PCI_EXP_TYPE_DOWNSTREAM; |
| } |
| } |
| } |
| |
| 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; |
| } |
| |
| static void set_pcie_thunderbolt(struct pci_dev *dev) |
| { |
| int vsec = 0; |
| u32 header; |
| |
| while ((vsec = pci_find_next_ext_capability(dev, vsec, |
| PCI_EXT_CAP_ID_VNDR))) { |
| pci_read_config_dword(dev, vsec + PCI_VNDR_HEADER, &header); |
| |
| /* Is the device part of a Thunderbolt controller? */ |
| if (dev->vendor == PCI_VENDOR_ID_INTEL && |
| PCI_VNDR_HEADER_ID(header) == PCI_VSEC_ID_INTEL_TBT) { |
| dev->is_thunderbolt = 1; |
| return; |
| } |
| } |
| } |
| |
| static void set_pcie_untrusted(struct pci_dev *dev) |
| { |
| struct pci_dev *parent; |
| |
| /* |
| * If the upstream bridge is untrusted we treat this device |
| * untrusted as well. |
| */ |
| parent = pci_upstream_bridge(dev); |
| if (parent && (parent->untrusted || parent->external_facing)) |
| dev->untrusted = true; |
| } |
| |
| /** |
| * 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_ext - 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) |
| return PCI_CFG_SPACE_SIZE; |
| if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev)) |
| return PCI_CFG_SPACE_SIZE; |
| |
| return PCI_CFG_SPACE_EXP_SIZE; |
| } |
| |
| int pci_cfg_space_size(struct pci_dev *dev) |
| { |
| int pos; |
| u32 status; |
| u16 class; |
| |
| #ifdef CONFIG_PCI_IOV |
| /* |
| * Per the SR-IOV specification (rev 1.1, sec 3.5), VFs are required to |
| * implement a PCIe capability and therefore must implement extended |
| * config space. We can skip the NO_EXTCFG test below and the |
| * reachability/aliasing test in pci_cfg_space_size_ext() by virtue of |
| * the fact that the SR-IOV capability on the PF resides in extended |
| * config space and must be accessible and non-aliased to have enabled |
| * support for this VF. This is a micro performance optimization for |
| * systems supporting many VFs. |
| */ |
| if (dev->is_virtfn) |
| return PCI_CFG_SPACE_EXP_SIZE; |
| #endif |
| |
| if (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_EXTCFG) |
| return PCI_CFG_SPACE_SIZE; |
| |
| class = dev->class >> 8; |
| if (class == PCI_CLASS_BRIDGE_HOST) |
| return pci_cfg_space_size_ext(dev); |
| |
| if (pci_is_pcie(dev)) |
| return pci_cfg_space_size_ext(dev); |
| |
| pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
| if (!pos) |
| return PCI_CFG_SPACE_SIZE; |
| |
| pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); |
| if (status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)) |
| return pci_cfg_space_size_ext(dev); |
| |
| return PCI_CFG_SPACE_SIZE; |
| } |
| |
| static u32 pci_class(struct pci_dev *dev) |
| { |
| u32 class; |
| |
| #ifdef CONFIG_PCI_IOV |
| if (dev->is_virtfn) |
| return dev->physfn->sriov->class; |
| #endif |
| pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); |
| return class; |
| } |
| |
| static void pci_subsystem_ids(struct pci_dev *dev, u16 *vendor, u16 *device) |
| { |
| #ifdef CONFIG_PCI_IOV |
| if (dev->is_virtfn) { |
| *vendor = dev->physfn->sriov->subsystem_vendor; |
| *device = dev->physfn->sriov->subsystem_device; |
| return; |
| } |
| #endif |
| pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, vendor); |
| pci_read_config_word(dev, PCI_SUBSYSTEM_ID, device); |
| } |
| |
| static u8 pci_hdr_type(struct pci_dev *dev) |
| { |
| u8 hdr_type; |
| |
| #ifdef CONFIG_PCI_IOV |
| if (dev->is_virtfn) |
| return dev->physfn->sriov->hdr_type; |
| #endif |
| pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type); |
| return hdr_type; |
| } |
| |
| #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) |
| |
| /** |
| * pci_intx_mask_broken - Test PCI_COMMAND_INTX_DISABLE writability |
| * @dev: PCI device |
| * |
| * Test whether PCI_COMMAND_INTX_DISABLE is writable for @dev. Check this |
| * at enumeration-time to avoid modifying PCI_COMMAND at run-time. |
| */ |
| static int pci_intx_mask_broken(struct pci_dev *dev) |
| { |
| u16 orig, toggle, new; |
| |
| pci_read_config_word(dev, PCI_COMMAND, &orig); |
| toggle = orig ^ PCI_COMMAND_INTX_DISABLE; |
| pci_write_config_word(dev, PCI_COMMAND, toggle); |
| pci_read_config_word(dev, PCI_COMMAND, &new); |
| |
| pci_write_config_word(dev, PCI_COMMAND, orig); |
| |
| /* |
| * PCI_COMMAND_INTX_DISABLE was reserved and read-only prior to PCI |
| * r2.3, so strictly speaking, a device is not *broken* if it's not |
| * writable. But we'll live with the misnomer for now. |
| */ |
| if (new != toggle) |
| return 1; |
| return 0; |
| } |
| |
| static void early_dump_pci_device(struct pci_dev *pdev) |
| { |
| u32 value[256 / 4]; |
| int i; |
| |
| pci_info(pdev, "config space:\n"); |
| |
| for (i = 0; i < 256; i += 4) |
| pci_read_config_dword(pdev, i, &value[i / 4]); |
| |
| print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 16, 1, |
| value, 256, false); |
| } |
| |
| /** |
| * 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; |
| u16 cmd; |
| u8 hdr_type; |
| int pos = 0; |
| struct pci_bus_region region; |
| struct resource *res; |
| |
| hdr_type = pci_hdr_type(dev); |
| |
| 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)); |
| |
| class = pci_class(dev); |
| |
| dev->revision = class & 0xff; |
| dev->class = class >> 8; /* upper 3 bytes */ |
| |
| if (pci_early_dump) |
| early_dump_pci_device(dev); |
| |
| /* Need to have dev->class ready */ |
| dev->cfg_size = pci_cfg_space_size(dev); |
| |
| /* Need to have dev->cfg_size ready */ |
| set_pcie_thunderbolt(dev); |
| |
| set_pcie_untrusted(dev); |
| |
| /* "Unknown power state" */ |
| dev->current_state = PCI_UNKNOWN; |
| |
| /* Early fixups, before probing the BARs */ |
| pci_fixup_device(pci_fixup_early, dev); |
| |
| pci_info(dev, "[%04x:%04x] type %02x class %#08x\n", |
| dev->vendor, dev->device, dev->hdr_type, dev->class); |
| |
| /* Device class may be changed after fixup */ |
| class = dev->class >> 8; |
| |
| if (dev->non_compliant_bars && !dev->mmio_always_on) { |
| pci_read_config_word(dev, PCI_COMMAND, &cmd); |
| if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) { |
| pci_info(dev, "device has non-compliant BARs; disabling IO/MEM decoding\n"); |
| cmd &= ~PCI_COMMAND_IO; |
| cmd &= ~PCI_COMMAND_MEMORY; |
| pci_write_config_word(dev, PCI_COMMAND, cmd); |
| } |
| } |
| |
| dev->broken_intx_masking = pci_intx_mask_broken(dev); |
| |
| 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_subsystem_ids(dev, &dev->subsystem_vendor, &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); |
| pci_info(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); |
| pci_info(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); |
| pci_info(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); |
| pci_info(dev, "legacy IDE quirk: reg 0x1c: %pR\n", |
| res); |
| } |
| } |
| break; |
| |
| case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ |
| /* |
| * 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); |
| pci_read_bridge_windows(dev); |
| 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 */ |
| pci_err(dev, "unknown header type %02x, ignoring device\n", |
| dev->hdr_type); |
| return -EIO; |
| |
| bad: |
| pci_err(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, mpss, p_mps, rc; |
| |
| if (!pci_is_pcie(dev)) |
| return; |
| |
| /* MPS and MRRS fields are of type 'RsvdP' for VFs, short-circuit out */ |
| if (dev->is_virtfn) |
| return; |
| |
| /* |
| * For Root Complex Integrated Endpoints, program the maximum |
| * supported value unless limited by the PCIE_BUS_PEER2PEER case. |
| */ |
| if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) { |
| if (pcie_bus_config == PCIE_BUS_PEER2PEER) |
| mps = 128; |
| else |
| mps = 128 << dev->pcie_mpss; |
| rc = pcie_set_mps(dev, mps); |
| if (rc) { |
| pci_warn(dev, "can't set Max Payload Size to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n", |
| mps); |
| } |
| return; |
| } |
| |
| if (!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) { |
| pci_warn(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; |
| |
| mpss = 128 << dev->pcie_mpss; |
| if (mpss < p_mps && pci_pcie_type(bridge) == PCI_EXP_TYPE_ROOT_PORT) { |
| pcie_set_mps(bridge, mpss); |
| pci_info(dev, "Upstream bridge's Max Payload Size set to %d (was %d, max %d)\n", |
| mpss, p_mps, 128 << bridge->pcie_mpss); |
| p_mps = pcie_get_mps(bridge); |
| } |
| |
| rc = pcie_set_mps(dev, p_mps); |
| if (rc) { |
| pci_warn(dev, "can't set Max Payload Size to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n", |
| p_mps); |
| return; |
| } |
| |
| pci_info(dev, "Max Payload Size set to %d (was %d, max %d)\n", |
| p_mps, mps, mpss); |
| } |
| |
| int pci_configure_extended_tags(struct pci_dev *dev, void *ign) |
| { |
| struct pci_host_bridge *host; |
| u32 cap; |
| u16 ctl; |
| int ret; |
| |
| if (!pci_is_pcie(dev)) |
| return 0; |
| |
| ret = pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap); |
| if (ret) |
| return 0; |
| |
| if (!(cap & PCI_EXP_DEVCAP_EXT_TAG)) |
| return 0; |
| |
| ret = pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &ctl); |
| if (ret) |
| return 0; |
| |
| host = pci_find_host_bridge(dev->bus); |
| if (!host) |
| return 0; |
| |
| /* |
| * If some device in the hierarchy doesn't handle Extended Tags |
| * correctly, make sure they're disabled. |
| */ |
| if (host->no_ext_tags) { |
| if (ctl & PCI_EXP_DEVCTL_EXT_TAG) { |
| pci_info(dev, "disabling Extended Tags\n"); |
| pcie_capability_clear_word(dev, PCI_EXP_DEVCTL, |
| PCI_EXP_DEVCTL_EXT_TAG); |
| } |
| return 0; |
| } |
| |
| if (!(ctl & PCI_EXP_DEVCTL_EXT_TAG)) { |
| pci_info(dev, "enabling Extended Tags\n"); |
| pcie_capability_set_word(dev, PCI_EXP_DEVCTL, |
| PCI_EXP_DEVCTL_EXT_TAG); |
| } |
| return 0; |
| } |
| |
| /** |
| * pcie_relaxed_ordering_enabled - Probe for PCIe relaxed ordering enable |
| * @dev: PCI device to query |
| * |
| * Returns true if the device has enabled relaxed ordering attribute. |
| */ |
| bool pcie_relaxed_ordering_enabled(struct pci_dev *dev) |
| { |
| u16 v; |
| |
| pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &v); |
| |
| return !!(v & PCI_EXP_DEVCTL_RELAX_EN); |
| } |
| EXPORT_SYMBOL(pcie_relaxed_ordering_enabled); |
| |
| static void pci_configure_relaxed_ordering(struct pci_dev *dev) |
| { |
| struct pci_dev *root; |
| |
| /* PCI_EXP_DEVICE_RELAX_EN is RsvdP in VFs */ |
| if (dev->is_virtfn) |
| return; |
| |
| if (!pcie_relaxed_ordering_enabled(dev)) |
| return; |
| |
| /* |
| * For now, we only deal with Relaxed Ordering issues with Root |
| * Ports. Peer-to-Peer DMA is another can of worms. |
| */ |
| root = pcie_find_root_port(dev); |
| if (!root) |
| return; |
| |
| if (root->dev_flags & PCI_DEV_FLAGS_NO_RELAXED_ORDERING) { |
| pcie_capability_clear_word(dev, PCI_EXP_DEVCTL, |
| PCI_EXP_DEVCTL_RELAX_EN); |
| pci_info(dev, "Relaxed Ordering disabled because the Root Port didn't support it\n"); |
| } |
| } |
| |
| static void pci_configure_ltr(struct pci_dev *dev) |
| { |
| #ifdef CONFIG_PCIEASPM |
| struct pci_host_bridge *host = pci_find_host_bridge(dev->bus); |
| struct pci_dev *bridge; |
| u32 cap, ctl; |
| |
| if (!pci_is_pcie(dev)) |
| return; |
| |
| /* Read L1 PM substate capabilities */ |
| dev->l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); |
| |
| pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap); |
| if (!(cap & PCI_EXP_DEVCAP2_LTR)) |
| return; |
| |
| pcie_capability_read_dword(dev, PCI_EXP_DEVCTL2, &ctl); |
| if (ctl & PCI_EXP_DEVCTL2_LTR_EN) { |
| if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) { |
| dev->ltr_path = 1; |
| return; |
| } |
| |
| bridge = pci_upstream_bridge(dev); |
| if (bridge && bridge->ltr_path) |
| dev->ltr_path = 1; |
| |
| return; |
| } |
| |
| if (!host->native_ltr) |
| return; |
| |
| /* |
| * Software must not enable LTR in an Endpoint unless the Root |
| * Complex and all intermediate Switches indicate support for LTR. |
| * PCIe r4.0, sec 6.18. |
| */ |
| if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT || |
| ((bridge = pci_upstream_bridge(dev)) && |
| bridge->ltr_path)) { |
| pcie_capability_set_word(dev, PCI_EXP_DEVCTL2, |
| PCI_EXP_DEVCTL2_LTR_EN); |
| dev->ltr_path = 1; |
| } |
| #endif |
| } |
| |
| static void pci_configure_eetlp_prefix(struct pci_dev *dev) |
| { |
| #ifdef CONFIG_PCI_PASID |
| struct pci_dev *bridge; |
| int pcie_type; |
| u32 cap; |
| |
| if (!pci_is_pcie(dev)) |
| return; |
| |
| pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap); |
| if (!(cap & PCI_EXP_DEVCAP2_EE_PREFIX)) |
| return; |
| |
| pcie_type = pci_pcie_type(dev); |
| if (pcie_type == PCI_EXP_TYPE_ROOT_PORT || |
| pcie_type == PCI_EXP_TYPE_RC_END) |
| dev->eetlp_prefix_path = 1; |
| else { |
| bridge = pci_upstream_bridge(dev); |
| if (bridge && bridge->eetlp_prefix_path) |
| dev->eetlp_prefix_path = 1; |
| } |
| #endif |
| } |
| |
| static void pci_configure_serr(struct pci_dev *dev) |
| { |
| u16 control; |
| |
| if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { |
| |
| /* |
| * A bridge will not forward ERR_ messages coming from an |
| * endpoint unless SERR# forwarding is enabled. |
| */ |
| pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &control); |
| if (!(control & PCI_BRIDGE_CTL_SERR)) { |
| control |= PCI_BRIDGE_CTL_SERR; |
| pci_write_config_word(dev, PCI_BRIDGE_CONTROL, control); |
| } |
| } |
| } |
| |
| static void pci_configure_device(struct pci_dev *dev) |
| { |
| pci_configure_mps(dev); |
| pci_configure_extended_tags(dev, NULL); |
| pci_configure_relaxed_ordering(dev); |
| pci_configure_ltr(dev); |
| pci_configure_eetlp_prefix(dev); |
| pci_configure_serr(dev); |
| |
| pci_acpi_program_hp_params(dev); |
| } |
| |
| static void pci_release_capabilities(struct pci_dev *dev) |
| { |
| pci_aer_exit(dev); |
| pci_rcec_exit(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); |
| bitmap_free(pci_dev->dma_alias_mask); |
| 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); |
| |
| static bool pci_bus_crs_vendor_id(u32 l) |
| { |
| return (l & 0xffff) == 0x0001; |
| } |
| |
| static bool pci_bus_wait_crs(struct pci_bus *bus, int devfn, u32 *l, |
| int timeout) |
| { |
| int delay = 1; |
| |
| if (!pci_bus_crs_vendor_id(*l)) |
| return true; /* not a CRS completion */ |
| |
| if (!timeout) |
| return false; /* CRS, but caller doesn't want to wait */ |
| |
| /* |
| * We got the reserved Vendor ID that indicates a completion with |
| * Configuration Request Retry Status (CRS). Retry until we get a |
| * valid Vendor ID or we time out. |
| */ |
| while (pci_bus_crs_vendor_id(*l)) { |
| if (delay > timeout) { |
| pr_warn("pci %04x:%02x:%02x.%d: not ready after %dms; giving up\n", |
| pci_domain_nr(bus), bus->number, |
| PCI_SLOT(devfn), PCI_FUNC(devfn), delay - 1); |
| |
| return false; |
| } |
| if (delay >= 1000) |
| pr_info("pci %04x:%02x:%02x.%d: not ready after %dms; waiting\n", |
| pci_domain_nr(bus), bus->number, |
| PCI_SLOT(devfn), PCI_FUNC(devfn), delay - 1); |
| |
| msleep(delay); |
| delay *= 2; |
| |
| if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) |
| return false; |
| } |
| |
| if (delay >= 1000) |
| pr_info("pci %04x:%02x:%02x.%d: ready after %dms\n", |
| pci_domain_nr(bus), bus->number, |
| PCI_SLOT(devfn), PCI_FUNC(devfn), delay - 1); |
| |
| return true; |
| } |
| |
| bool pci_bus_generic_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l, |
| int timeout) |
| { |
| 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; |
| |
| if (pci_bus_crs_vendor_id(*l)) |
| return pci_bus_wait_crs(bus, devfn, l, timeout); |
| |
| return true; |
| } |
| |
| bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l, |
| int timeout) |
| { |
| #ifdef CONFIG_PCI_QUIRKS |
| struct pci_dev *bridge = bus->self; |
| |
| /* |
| * Certain IDT switches have an issue where they improperly trigger |
| * ACS Source Validation errors on completions for config reads. |
| */ |
| if (bridge && bridge->vendor == PCI_VENDOR_ID_IDT && |
| bridge->device == 0x80b5) |
| return pci_idt_bus_quirk(bus, devfn, l, timeout); |
| #endif |
| |
| return pci_bus_generic_read_dev_vendor_id(bus, devfn, l, timeout); |
| } |
| 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_release_of_node(dev); |
| pci_bus_put(dev->bus); |
| kfree(dev); |
| return NULL; |
| } |
| |
| return dev; |
| } |
| |
| void pcie_report_downtraining(struct pci_dev *dev) |
| { |
| if (!pci_is_pcie(dev)) |
| return; |
| |
| /* Look from the device up to avoid downstream ports with no devices */ |
| if ((pci_pcie_type(dev) != PCI_EXP_TYPE_ENDPOINT) && |
| (pci_pcie_type(dev) != PCI_EXP_TYPE_LEG_END) && |
| (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM)) |
| return; |
| |
| /* Multi-function PCIe devices share the same link/status */ |
| if (PCI_FUNC(dev->devfn) != 0 || dev->is_virtfn) |
| return; |
| |
| /* Print link status only if the device is constrained by the fabric */ |
| __pcie_print_link_status(dev, false); |
| } |
| |
| static void pci_init_capabilities(struct pci_dev *dev) |
| { |
| pci_ea_init(dev); /* Enhanced Allocation */ |
| pci_msi_init(dev); /* Disable MSI */ |
| pci_msix_init(dev); /* Disable MSI-X */ |
| |
| /* Buffers for saving PCIe and PCI-X capabilities */ |
| pci_allocate_cap_save_buffers(dev); |
| |
| pci_pm_init(dev); /* Power Management */ |
| pci_vpd_init(dev); /* Vital Product Data */ |
| pci_configure_ari(dev); /* Alternative Routing-ID Forwarding */ |
| pci_iov_init(dev); /* Single Root I/O Virtualization */ |
| pci_ats_init(dev); /* Address Translation Services */ |
| pci_pri_init(dev); /* Page Request Interface */ |
| pci_pasid_init(dev); /* Process Address Space ID */ |
| pci_acs_init(dev); /* Access Control Services */ |
| pci_ptm_init(dev); /* Precision Time Measurement */ |
| pci_aer_init(dev); /* Advanced Error Reporting */ |
| pci_dpc_init(dev); /* Downstream Port Containment */ |
| pci_rcec_init(dev); /* Root Complex Event Collector */ |
| |
| pcie_report_downtraining(dev); |
| |
| if (pci_probe_reset_function(dev) == 0) |
| dev->reset_fn = 1; |
| } |
| |
| /* |
| * 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); |
| } |
| |
| 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; |
| |
| dma_set_max_seg_size(&dev->dev, 65536); |
| dma_set_seg_boundary(&dev->dev, 0xffffffff); |
| |
| /* Fix up broken headers */ |
| pci_fixup_device(pci_fixup_header, dev); |
| |
| pci_reassigndev_resource_alignment(dev); |
| |
| dev->state_saved = false; |
| |
| 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); |
| |
| /* Set up 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 *bridge = bus->self; |
| |
| /* |
| * Systems with unusual topologies set PCI_SCAN_ALL_PCIE_DEVS so |
| * we scan for all possible devices, not just Device 0. |
| */ |
| if (pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS)) |
| return 0; |
| |
| /* |
| * A PCIe Downstream Port normally leads to a Link with only Device |
| * 0 on it (PCIe spec r3.1, sec 7.3.1). As an optimization, scan |
| * only for Device 0 in that situation. |
| */ |
| if (bridge && pci_is_pcie(bridge) && pcie_downstream_port(bridge)) |
| 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 (!pci_dev_is_added(dev)) |
| 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 (!pci_dev_is_added(dev)) |
| 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) |
| pci_err(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; |
| |
| pci_warn(dev, "Failed attempting to set the MRRS\n"); |
| mrrs /= 2; |
| } |
| |
| if (mrrs < 128) |
| pci_err(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); |
| |
| pci_info(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); |
| |
| /* |
| * Called after each bus is probed, but before its children are examined. This |
| * is marked as __weak because multiple architectures define it. |
| */ |
| void __weak pcibios_fixup_bus(struct pci_bus *bus) |
| { |
| /* nothing to do, expected to be removed in the future */ |
| } |
| |
| /** |
| * pci_scan_child_bus_extend() - Scan devices below a bus |
| * @bus: Bus to scan for devices |
| * @available_buses: Total number of buses available (%0 does not try to |
| * extend beyond the minimal) |
| * |
| * Scans devices below @bus including subordinate buses. Returns new |
| * subordinate number including all the found devices. Passing |
| * @available_buses causes the remaining bus space to be distributed |
| * equally between hotplug-capable bridges to allow future extension of the |
| * hierarchy. |
| */ |
| static unsigned int pci_scan_child_bus_extend(struct pci_bus *bus, |
| unsigned int available_buses) |
| { |
| unsigned int used_buses, normal_bridges = 0, hotplug_bridges = 0; |
| unsigned int start = bus->busn_res.start; |
| unsigned int devfn, fn, cmax, max = start; |
| struct pci_dev *dev; |
| int nr_devs; |
| |
| dev_dbg(&bus->dev, "scanning bus\n"); |
| |
| /* Go find them, Rover! */ |
| for (devfn = 0; devfn < 256; devfn += 8) { |
| nr_devs = pci_scan_slot(bus, devfn); |
| |
| /* |
| * The Jailhouse hypervisor may pass individual functions of a |
| * multi-function device to a guest without passing function 0. |
| * Look for them as well. |
| */ |
| if (jailhouse_paravirt() && nr_devs == 0) { |
| for (fn = 1; fn < 8; fn++) { |
| dev = pci_scan_single_device(bus, devfn + fn); |
| if (dev) |
| dev->multifunction = 1; |
| } |
| } |
| } |
| |
| /* Reserve buses for SR-IOV capability */ |
| used_buses = pci_iov_bus_range(bus); |
| max += used_buses; |
| |
| /* |
| * 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; |
| } |
| |
| /* |
| * Calculate how many hotplug bridges and normal bridges there |
| * are on this bus. We will distribute the additional available |
| * buses between hotplug bridges. |
| */ |
| for_each_pci_bridge(dev, bus) { |
| if (dev->is_hotplug_bridge) |
| hotplug_bridges++; |
| else |
| normal_bridges++; |
| } |
| |
| /* |
| * Scan bridges that are already configured. We don't touch them |
| * unless they are misconfigured (which will be done in the second |
| * scan below). |
| */ |
| for_each_pci_bridge(dev, bus) { |
| cmax = max; |
| max = pci_scan_bridge_extend(bus, dev, max, 0, 0); |
| |
| /* |
| * Reserve one bus for each bridge now to avoid extending |
| * hotplug bridges too much during the second scan below. |
| */ |
| used_buses++; |
| if (cmax - max > 1) |
| used_buses += cmax - max - 1; |
| } |
| |
| /* Scan bridges that need to be reconfigured */ |
| for_each_pci_bridge(dev, bus) { |
| unsigned int buses = 0; |
| |
| if (!hotplug_bridges && normal_bridges == 1) { |
| |
| /* |
| * There is only one bridge on the bus (upstream |
| * port) so it gets all available buses which it |
| * can then distribute to the possible hotplug |
| * bridges below. |
| */ |
| buses = available_buses; |
| } else if (dev->is_hotplug_bridge) { |
| |
| /* |
| * Distribute the extra buses between hotplug |
| * bridges if any. |
| */ |
| buses = available_buses / hotplug_bridges; |
| buses = min(buses, available_buses - used_buses + 1); |
| } |
| |
| cmax = max; |
| max = pci_scan_bridge_extend(bus, dev, cmax, buses, 1); |
| /* One bus is already accounted so don't add it again */ |
| if (max - cmax > 1) |
| used_buses += max - cmax - 1; |
| } |
| |
| /* |
| * Make sure a hotplug bridge has at least the minimum requested |
| * number of buses but allow it to grow up to the maximum available |
| * bus number of there is room. |
| */ |
| if (bus->self && bus->self->is_hotplug_bridge) { |
| used_buses = max_t(unsigned int, available_buses, |
| pci_hotplug_bus_size - 1); |
| if (max - start < used_buses) { |
| max = start + used_buses; |
| |
| /* Do not allocate more buses than we have room left */ |
| if (max > bus->busn_res.end) |
| max = bus->busn_res.end; |
| |
| dev_dbg(&bus->dev, "%pR extended by %#02x\n", |
| &bus->busn_res, max - start); |
| } |
| } |
| |
| /* |
| * 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; |
| } |
| |
| /** |
| * pci_scan_child_bus() - Scan devices below a bus |
| * @bus: Bus to scan for devices |
| * |
| * Scans devices below @bus including subordinate buses. Returns new |
| * subordinate number including all the found devices. |
| */ |
| unsigned int pci_scan_child_bus(struct pci_bus *bus) |
| { |
| return pci_scan_child_bus_extend(bus, 0); |
| } |
| 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; |
| |
| bridge = pci_alloc_host_bridge(0); |
| if (!bridge) |
| return NULL; |
| |
| bridge->dev.parent = parent; |
| |
| list_splice_init(resources, &bridge->windows); |
| bridge->sysdata = sysdata; |
| bridge->busnr = bus; |
| bridge->ops = ops; |
| |
| error = pci_register_host_bridge(bridge); |
| if (error < 0) |
| goto err_out; |
| |
| return bridge->bus; |
| |
| err_out: |
| put_device(&bridge->dev); |
| return NULL; |
| } |
| EXPORT_SYMBOL_GPL(pci_create_root_bus); |
| |
| int pci_host_probe(struct pci_host_bridge *bridge) |
| { |
| struct pci_bus *bus, *child; |
| int ret; |
| |
| ret = pci_scan_root_bus_bridge(bridge); |
| if (ret < 0) { |
| dev_err(bridge->dev.parent, "Scanning root bridge failed"); |
| return ret; |
| } |
| |
| bus = bridge->bus; |
| |
| /* |
| * We insert PCI resources into the iomem_resource and |
| * ioport_resource trees in either pci_bus_claim_resources() |
| * or pci_bus_assign_resources(). |
| */ |
| if (pci_has_flag(PCI_PROBE_ONLY)) { |
| pci_bus_claim_resources(bus); |
| } else { |
| pci_bus_size_bridges(bus); |
| pci_bus_assign_resources(bus); |
| |
| list_for_each_entry(child, &bus->children, node) |
| pcie_bus_configure_settings(child); |
| } |
| |
| pci_bus_add_devices(bus); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pci_host_probe); |
| |
| 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_info(&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_info(&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_info(&b->dev, "busn_res: %pR %s released\n", |
| res, ret ? "can not be" : "is"); |
| } |
| |
| int pci_scan_root_bus_bridge(struct pci_host_bridge *bridge) |
| { |
| struct resource_entry *window; |
| bool found = false; |
| struct pci_bus *b; |
| int max, bus, ret; |
| |
| if (!bridge) |
| return -EINVAL; |
| |
| resource_list_for_each_entry(window, &bridge->windows) |
| if (window->res->flags & IORESOURCE_BUS) { |
| bridge->busnr = window->res->start; |
| found = true; |
| break; |
| } |
| |
| ret = pci_register_host_bridge(bridge); |
| if (ret < 0) |
| return ret; |
| |
| b = bridge->bus; |
| bus = bridge->busnr; |
| |
| 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 0; |
| } |
| EXPORT_SYMBOL(pci_scan_root_bus_bridge); |
| |
| struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, |
| struct pci_ops *ops, void *sysdata, struct list_head *resources) |
| { |
| 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; |
| |
| 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; |
| } |
| 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, add them, |
| * and enable 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); |
| } |
| |
| int pci_hp_add_bridge(struct pci_dev *dev) |
| { |
| struct pci_bus *parent = dev->bus; |
| int busnr, start = parent->busn_res.start; |
| unsigned int available_buses = 0; |
| int end = parent->busn_res.end; |
| |
| for (busnr = start; busnr <= end; busnr++) { |
| if (!pci_find_bus(pci_domain_nr(parent), busnr)) |
| break; |
| } |
| if (busnr-- > end) { |
| pci_err(dev, "No bus number available for hot-added bridge\n"); |
| return -1; |
| } |
| |
| /* Scan bridges that are already configured */ |
| busnr = pci_scan_bridge(parent, dev, busnr, 0); |
| |
| /* |
| * Distribute the available bus numbers between hotplug-capable |
| * bridges to make extending the chain later possible. |
| */ |
| available_buses = end - busnr; |
| |
| /* Scan bridges that need to be reconfigured */ |
| pci_scan_bridge_extend(parent, dev, busnr, available_buses, 1); |
| |
| if (!dev->subordinate) |
| return -1; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pci_hp_add_bridge); |