/* * drivers/pci/setup-bus.c * * Extruded from code written by * Dave Rusling (david.rusling@reo.mts.dec.com) * David Mosberger (davidm@cs.arizona.edu) * David Miller (davem@redhat.com) * * Support routines for initializing a PCI subsystem. */ /* * Nov 2000, Ivan Kokshaysky * PCI-PCI bridges cleanup, sorted resource allocation. * Feb 2002, Ivan Kokshaysky * Converted to allocation in 3 passes, which gives * tighter packing. Prefetchable range support. */ #include #include #include #include #include #include #include #include #include #include "pci.h" unsigned int pci_flags; struct pci_dev_resource { struct list_head list; struct resource *res; struct pci_dev *dev; resource_size_t start; resource_size_t end; resource_size_t add_size; resource_size_t min_align; unsigned long flags; }; static void free_list(struct list_head *head) { struct pci_dev_resource *dev_res, *tmp; list_for_each_entry_safe(dev_res, tmp, head, list) { list_del(&dev_res->list); kfree(dev_res); } } /** * add_to_list() - add a new resource tracker to the list * @head: Head of the list * @dev: device corresponding to which the resource * belongs * @res: The resource to be tracked * @add_size: additional size to be optionally added * to the resource */ static int add_to_list(struct list_head *head, struct pci_dev *dev, struct resource *res, resource_size_t add_size, resource_size_t min_align) { struct pci_dev_resource *tmp; tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); if (!tmp) { pr_warn("add_to_list: kmalloc() failed!\n"); return -ENOMEM; } tmp->res = res; tmp->dev = dev; tmp->start = res->start; tmp->end = res->end; tmp->flags = res->flags; tmp->add_size = add_size; tmp->min_align = min_align; list_add(&tmp->list, head); return 0; } static void remove_from_list(struct list_head *head, struct resource *res) { struct pci_dev_resource *dev_res, *tmp; list_for_each_entry_safe(dev_res, tmp, head, list) { if (dev_res->res == res) { list_del(&dev_res->list); kfree(dev_res); break; } } } static struct pci_dev_resource *res_to_dev_res(struct list_head *head, struct resource *res) { struct pci_dev_resource *dev_res; list_for_each_entry(dev_res, head, list) { if (dev_res->res == res) { int idx = res - &dev_res->dev->resource[0]; dev_printk(KERN_DEBUG, &dev_res->dev->dev, "res[%d]=%pR res_to_dev_res add_size %llx min_align %llx\n", idx, dev_res->res, (unsigned long long)dev_res->add_size, (unsigned long long)dev_res->min_align); return dev_res; } } return NULL; } static resource_size_t get_res_add_size(struct list_head *head, struct resource *res) { struct pci_dev_resource *dev_res; dev_res = res_to_dev_res(head, res); return dev_res ? dev_res->add_size : 0; } static resource_size_t get_res_add_align(struct list_head *head, struct resource *res) { struct pci_dev_resource *dev_res; dev_res = res_to_dev_res(head, res); return dev_res ? dev_res->min_align : 0; } /* Sort resources by alignment */ static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head) { int i; for (i = 0; i < PCI_NUM_RESOURCES; i++) { struct resource *r; struct pci_dev_resource *dev_res, *tmp; resource_size_t r_align; struct list_head *n; r = &dev->resource[i]; if (r->flags & IORESOURCE_PCI_FIXED) continue; if (!(r->flags) || r->parent) continue; r_align = pci_resource_alignment(dev, r); if (!r_align) { dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n", i, r); continue; } tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); if (!tmp) panic("pdev_sort_resources(): kmalloc() failed!\n"); tmp->res = r; tmp->dev = dev; /* fallback is smallest one or list is empty*/ n = head; list_for_each_entry(dev_res, head, list) { resource_size_t align; align = pci_resource_alignment(dev_res->dev, dev_res->res); if (r_align > align) { n = &dev_res->list; break; } } /* Insert it just before n*/ list_add_tail(&tmp->list, n); } } static void __dev_sort_resources(struct pci_dev *dev, struct list_head *head) { u16 class = dev->class >> 8; /* Don't touch classless devices or host bridges or ioapics. */ if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST) return; /* Don't touch ioapic devices already enabled by firmware */ if (class == PCI_CLASS_SYSTEM_PIC) { u16 command; pci_read_config_word(dev, PCI_COMMAND, &command); if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) return; } pdev_sort_resources(dev, head); } static inline void reset_resource(struct resource *res) { res->start = 0; res->end = 0; res->flags = 0; } /** * reassign_resources_sorted() - satisfy any additional resource requests * * @realloc_head : head of the list tracking requests requiring additional * resources * @head : head of the list tracking requests with allocated * resources * * Walk through each element of the realloc_head and try to procure * additional resources for the element, provided the element * is in the head list. */ static void reassign_resources_sorted(struct list_head *realloc_head, struct list_head *head) { struct resource *res; struct pci_dev_resource *add_res, *tmp; struct pci_dev_resource *dev_res; resource_size_t add_size, align; int idx; list_for_each_entry_safe(add_res, tmp, realloc_head, list) { bool found_match = false; res = add_res->res; /* skip resource that has been reset */ if (!res->flags) goto out; /* skip this resource if not found in head list */ list_for_each_entry(dev_res, head, list) { if (dev_res->res == res) { found_match = true; break; } } if (!found_match)/* just skip */ continue; idx = res - &add_res->dev->resource[0]; add_size = add_res->add_size; align = add_res->min_align; if (!resource_size(res)) { res->start = align; res->end = res->start + add_size - 1; if (pci_assign_resource(add_res->dev, idx)) reset_resource(res); } else { res->flags |= add_res->flags & (IORESOURCE_STARTALIGN|IORESOURCE_SIZEALIGN); if (pci_reassign_resource(add_res->dev, idx, add_size, align)) dev_printk(KERN_DEBUG, &add_res->dev->dev, "failed to add %llx res[%d]=%pR\n", (unsigned long long)add_size, idx, res); } out: list_del(&add_res->list); kfree(add_res); } } /** * assign_requested_resources_sorted() - satisfy resource requests * * @head : head of the list tracking requests for resources * @fail_head : head of the list tracking requests that could * not be allocated * * Satisfy resource requests of each element in the list. Add * requests that could not satisfied to the failed_list. */ static void assign_requested_resources_sorted(struct list_head *head, struct list_head *fail_head) { struct resource *res; struct pci_dev_resource *dev_res; int idx; list_for_each_entry(dev_res, head, list) { res = dev_res->res; idx = res - &dev_res->dev->resource[0]; if (resource_size(res) && pci_assign_resource(dev_res->dev, idx)) { if (fail_head) { /* * if the failed res is for ROM BAR, and it will * be enabled later, don't add it to the list */ if (!((idx == PCI_ROM_RESOURCE) && (!(res->flags & IORESOURCE_ROM_ENABLE)))) add_to_list(fail_head, dev_res->dev, res, 0 /* don't care */, 0 /* don't care */); } reset_resource(res); } } } static unsigned long pci_fail_res_type_mask(struct list_head *fail_head) { struct pci_dev_resource *fail_res; unsigned long mask = 0; /* check failed type */ list_for_each_entry(fail_res, fail_head, list) mask |= fail_res->flags; /* * one pref failed resource will set IORESOURCE_MEM, * as we can allocate pref in non-pref range. * Will release all assigned non-pref sibling resources * according to that bit. */ return mask & (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH); } static bool pci_need_to_release(unsigned long mask, struct resource *res) { if (res->flags & IORESOURCE_IO) return !!(mask & IORESOURCE_IO); /* check pref at first */ if (res->flags & IORESOURCE_PREFETCH) { if (mask & IORESOURCE_PREFETCH) return true; /* count pref if its parent is non-pref */ else if ((mask & IORESOURCE_MEM) && !(res->parent->flags & IORESOURCE_PREFETCH)) return true; else return false; } if (res->flags & IORESOURCE_MEM) return !!(mask & IORESOURCE_MEM); return false; /* should not get here */ } static void __assign_resources_sorted(struct list_head *head, struct list_head *realloc_head, struct list_head *fail_head) { /* * Should not assign requested resources at first. * they could be adjacent, so later reassign can not reallocate * them one by one in parent resource window. * Try to assign requested + add_size at beginning * if could do that, could get out early. * if could not do that, we still try to assign requested at first, * then try to reassign add_size for some resources. * * Separate three resource type checking if we need to release * assigned resource after requested + add_size try. * 1. if there is io port assign fail, will release assigned * io port. * 2. if there is pref mmio assign fail, release assigned * pref mmio. * if assigned pref mmio's parent is non-pref mmio and there * is non-pref mmio assign fail, will release that assigned * pref mmio. * 3. if there is non-pref mmio assign fail or pref mmio * assigned fail, will release assigned non-pref mmio. */ LIST_HEAD(save_head); LIST_HEAD(local_fail_head); struct pci_dev_resource *save_res; struct pci_dev_resource *dev_res, *tmp_res, *dev_res2; unsigned long fail_type; resource_size_t add_align, align; /* Check if optional add_size is there */ if (!realloc_head || list_empty(realloc_head)) goto requested_and_reassign; /* Save original start, end, flags etc at first */ list_for_each_entry(dev_res, head, list) { if (add_to_list(&save_head, dev_res->dev, dev_res->res, 0, 0)) { free_list(&save_head); goto requested_and_reassign; } } /* Update res in head list with add_size in realloc_head list */ list_for_each_entry_safe(dev_res, tmp_res, head, list) { dev_res->res->end += get_res_add_size(realloc_head, dev_res->res); /* * There are two kinds of additional resources in the list: * 1. bridge resource -- IORESOURCE_STARTALIGN * 2. SR-IOV resource -- IORESOURCE_SIZEALIGN * Here just fix the additional alignment for bridge */ if (!(dev_res->res->flags & IORESOURCE_STARTALIGN)) continue; add_align = get_res_add_align(realloc_head, dev_res->res); /* * The "head" list is sorted by the alignment to make sure * resources with bigger alignment will be assigned first. * After we change the alignment of a dev_res in "head" list, * we need to reorder the list by alignment to make it * consistent. */ if (add_align > dev_res->res->start) { dev_res->res->start = add_align; dev_res->res->end = add_align + resource_size(dev_res->res); list_for_each_entry(dev_res2, head, list) { align = pci_resource_alignment(dev_res2->dev, dev_res2->res); if (add_align > align) list_move_tail(&dev_res->list, &dev_res2->list); } } } /* Try updated head list with add_size added */ assign_requested_resources_sorted(head, &local_fail_head); /* all assigned with add_size ? */ if (list_empty(&local_fail_head)) { /* Remove head list from realloc_head list */ list_for_each_entry(dev_res, head, list) remove_from_list(realloc_head, dev_res->res); free_list(&save_head); free_list(head); return; } /* check failed type */ fail_type = pci_fail_res_type_mask(&local_fail_head); /* remove not need to be released assigned res from head list etc */ list_for_each_entry_safe(dev_res, tmp_res, head, list) if (dev_res->res->parent && !pci_need_to_release(fail_type, dev_res->res)) { /* remove it from realloc_head list */ remove_from_list(realloc_head, dev_res->res); remove_from_list(&save_head, dev_res->res); list_del(&dev_res->list); kfree(dev_res); } free_list(&local_fail_head); /* Release assigned resource */ list_for_each_entry(dev_res, head, list) if (dev_res->res->parent) release_resource(dev_res->res); /* Restore start/end/flags from saved list */ list_for_each_entry(save_res, &save_head, list) { struct resource *res = save_res->res; res->start = save_res->start; res->end = save_res->end; res->flags = save_res->flags; } free_list(&save_head); requested_and_reassign: /* Satisfy the must-have resource requests */ assign_requested_resources_sorted(head, fail_head); /* Try to satisfy any additional optional resource requests */ if (realloc_head) reassign_resources_sorted(realloc_head, head); free_list(head); } static void pdev_assign_resources_sorted(struct pci_dev *dev, struct list_head *add_head, struct list_head *fail_head) { LIST_HEAD(head); __dev_sort_resources(dev, &head); __assign_resources_sorted(&head, add_head, fail_head); } static void pbus_assign_resources_sorted(const struct pci_bus *bus, struct list_head *realloc_head, struct list_head *fail_head) { struct pci_dev *dev; LIST_HEAD(head); list_for_each_entry(dev, &bus->devices, bus_list) __dev_sort_resources(dev, &head); __assign_resources_sorted(&head, realloc_head, fail_head); } void pci_setup_cardbus(struct pci_bus *bus) { struct pci_dev *bridge = bus->self; struct resource *res; struct pci_bus_region region; dev_info(&bridge->dev, "CardBus bridge to %pR\n", &bus->busn_res); res = bus->resource[0]; pcibios_resource_to_bus(bridge->bus, ®ion, res); if (res->flags & IORESOURCE_IO) { /* * The IO resource is allocated a range twice as large as it * would normally need. This allows us to set both IO regs. */ dev_info(&bridge->dev, " bridge window %pR\n", res); pci_write_config_dword(bridge, PCI_CB_IO_BASE_0, region.start); pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0, region.end); } res = bus->resource[1]; pcibios_resource_to_bus(bridge->bus, ®ion, res); if (res->flags & IORESOURCE_IO) { dev_info(&bridge->dev, " bridge window %pR\n", res); pci_write_config_dword(bridge, PCI_CB_IO_BASE_1, region.start); pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1, region.end); } res = bus->resource[2]; pcibios_resource_to_bus(bridge->bus, ®ion, res); if (res->flags & IORESOURCE_MEM) { dev_info(&bridge->dev, " bridge window %pR\n", res); pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0, region.start); pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0, region.end); } res = bus->resource[3]; pcibios_resource_to_bus(bridge->bus, ®ion, res); if (res->flags & IORESOURCE_MEM) { dev_info(&bridge->dev, " bridge window %pR\n", res); pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1, region.start); pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1, region.end); } } EXPORT_SYMBOL(pci_setup_cardbus); /* Initialize bridges with base/limit values we have collected. PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998) requires that if there is no I/O ports or memory behind the bridge, corresponding range must be turned off by writing base value greater than limit to the bridge's base/limit registers. Note: care must be taken when updating I/O base/limit registers of bridges which support 32-bit I/O. This update requires two config space writes, so it's quite possible that an I/O window of the bridge will have some undesirable address (e.g. 0) after the first write. Ditto 64-bit prefetchable MMIO. */ static void pci_setup_bridge_io(struct pci_dev *bridge) { struct resource *res; struct pci_bus_region region; unsigned long io_mask; u8 io_base_lo, io_limit_lo; u16 l; u32 io_upper16; io_mask = PCI_IO_RANGE_MASK; if (bridge->io_window_1k) io_mask = PCI_IO_1K_RANGE_MASK; /* Set up the top and bottom of the PCI I/O segment for this bus. */ res = &bridge->resource[PCI_BRIDGE_RESOURCES + 0]; pcibios_resource_to_bus(bridge->bus, ®ion, res); if (res->flags & IORESOURCE_IO) { pci_read_config_word(bridge, PCI_IO_BASE, &l); io_base_lo = (region.start >> 8) & io_mask; io_limit_lo = (region.end >> 8) & io_mask; l = ((u16) io_limit_lo << 8) | io_base_lo; /* Set up upper 16 bits of I/O base/limit. */ io_upper16 = (region.end & 0xffff0000) | (region.start >> 16); dev_info(&bridge->dev, " bridge window %pR\n", res); } else { /* Clear upper 16 bits of I/O base/limit. */ io_upper16 = 0; l = 0x00f0; } /* Temporarily disable the I/O range before updating PCI_IO_BASE. */ pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff); /* Update lower 16 bits of I/O base/limit. */ pci_write_config_word(bridge, PCI_IO_BASE, l); /* Update upper 16 bits of I/O base/limit. */ pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16); } static void pci_setup_bridge_mmio(struct pci_dev *bridge) { struct resource *res; struct pci_bus_region region; u32 l; /* Set up the top and bottom of the PCI Memory segment for this bus. */ res = &bridge->resource[PCI_BRIDGE_RESOURCES + 1]; pcibios_resource_to_bus(bridge->bus, ®ion, res); if (res->flags & IORESOURCE_MEM) { l = (region.start >> 16) & 0xfff0; l |= region.end & 0xfff00000; dev_info(&bridge->dev, " bridge window %pR\n", res); } else { l = 0x0000fff0; } pci_write_config_dword(bridge, PCI_MEMORY_BASE, l); } static void pci_setup_bridge_mmio_pref(struct pci_dev *bridge) { struct resource *res; struct pci_bus_region region; u32 l, bu, lu; /* Clear out the upper 32 bits of PREF limit. If PCI_PREF_BASE_UPPER32 was non-zero, this temporarily disables PREF range, which is ok. */ pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0); /* Set up PREF base/limit. */ bu = lu = 0; res = &bridge->resource[PCI_BRIDGE_RESOURCES + 2]; pcibios_resource_to_bus(bridge->bus, ®ion, res); if (res->flags & IORESOURCE_PREFETCH) { l = (region.start >> 16) & 0xfff0; l |= region.end & 0xfff00000; if (res->flags & IORESOURCE_MEM_64) { bu = upper_32_bits(region.start); lu = upper_32_bits(region.end); } dev_info(&bridge->dev, " bridge window %pR\n", res); } else { l = 0x0000fff0; } pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l); /* Set the upper 32 bits of PREF base & limit. */ pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu); pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu); } static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type) { struct pci_dev *bridge = bus->self; dev_info(&bridge->dev, "PCI bridge to %pR\n", &bus->busn_res); if (type & IORESOURCE_IO) pci_setup_bridge_io(bridge); if (type & IORESOURCE_MEM) pci_setup_bridge_mmio(bridge); if (type & IORESOURCE_PREFETCH) pci_setup_bridge_mmio_pref(bridge); pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl); } void pci_setup_bridge(struct pci_bus *bus) { unsigned long type = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH; __pci_setup_bridge(bus, type); } int pci_claim_bridge_resource(struct pci_dev *bridge, int i) { if (i < PCI_BRIDGE_RESOURCES || i > PCI_BRIDGE_RESOURCE_END) return 0; if (pci_claim_resource(bridge, i) == 0) return 0; /* claimed the window */ if ((bridge->class >> 8) != PCI_CLASS_BRIDGE_PCI) return 0; if (!pci_bus_clip_resource(bridge, i)) return -EINVAL; /* clipping didn't change anything */ switch (i - PCI_BRIDGE_RESOURCES) { case 0: pci_setup_bridge_io(bridge); break; case 1: pci_setup_bridge_mmio(bridge); break; case 2: pci_setup_bridge_mmio_pref(bridge); break; default: return -EINVAL; } if (pci_claim_resource(bridge, i) == 0) return 0; /* claimed a smaller window */ return -EINVAL; } /* Check whether the bridge supports optional I/O and prefetchable memory ranges. If not, the respective base/limit registers must be read-only and read as 0. */ static void pci_bridge_check_ranges(struct pci_bus *bus) { u16 io; u32 pmem; struct pci_dev *bridge = bus->self; struct resource *b_res; b_res = &bridge->resource[PCI_BRIDGE_RESOURCES]; b_res[1].flags |= IORESOURCE_MEM; 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) b_res[0].flags |= IORESOURCE_IO; /* 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) { b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH; if ((pmem & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { b_res[2].flags |= IORESOURCE_MEM_64; b_res[2].flags |= PCI_PREF_RANGE_TYPE_64; } } /* double check if bridge does support 64 bit pref */ if (b_res[2].flags & IORESOURCE_MEM_64) { u32 mem_base_hi, tmp; pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &mem_base_hi); pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, 0xffffffff); pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp); if (!tmp) b_res[2].flags &= ~IORESOURCE_MEM_64; pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, mem_base_hi); } } /* Helper function for sizing routines: find first available bus resource of a given type. Note: we intentionally skip the bus resources which have already been assigned (that is, have non-NULL parent resource). */ static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned long type_mask, unsigned long type) { int i; struct resource *r; pci_bus_for_each_resource(bus, r, i) { if (r == &ioport_resource || r == &iomem_resource) continue; if (r && (r->flags & type_mask) == type && !r->parent) return r; } return NULL; } static resource_size_t calculate_iosize(resource_size_t size, resource_size_t min_size, resource_size_t size1, resource_size_t old_size, resource_size_t align) { if (size < min_size) size = min_size; if (old_size == 1) old_size = 0; /* To be fixed in 2.5: we should have sort of HAVE_ISA flag in the struct pci_bus. */ #if defined(CONFIG_ISA) || defined(CONFIG_EISA) size = (size & 0xff) + ((size & ~0xffUL) << 2); #endif size = ALIGN(size + size1, align); if (size < old_size) size = old_size; return size; } static resource_size_t calculate_memsize(resource_size_t size, resource_size_t min_size, resource_size_t size1, resource_size_t old_size, resource_size_t align) { if (size < min_size) size = min_size; if (old_size == 1) old_size = 0; if (size < old_size) size = old_size; size = ALIGN(size + size1, align); return size; } resource_size_t __weak pcibios_window_alignment(struct pci_bus *bus, unsigned long type) { return 1; } #define PCI_P2P_DEFAULT_MEM_ALIGN 0x100000 /* 1MiB */ #define PCI_P2P_DEFAULT_IO_ALIGN 0x1000 /* 4KiB */ #define PCI_P2P_DEFAULT_IO_ALIGN_1K 0x400 /* 1KiB */ static resource_size_t window_alignment(struct pci_bus *bus, unsigned long type) { resource_size_t align = 1, arch_align; if (type & IORESOURCE_MEM) align = PCI_P2P_DEFAULT_MEM_ALIGN; else if (type & IORESOURCE_IO) { /* * Per spec, I/O windows are 4K-aligned, but some * bridges have an extension to support 1K alignment. */ if (bus->self->io_window_1k) align = PCI_P2P_DEFAULT_IO_ALIGN_1K; else align = PCI_P2P_DEFAULT_IO_ALIGN; } arch_align = pcibios_window_alignment(bus, type); return max(align, arch_align); } /** * pbus_size_io() - size the io window of a given bus * * @bus : the bus * @min_size : the minimum io window that must to be allocated * @add_size : additional optional io window * @realloc_head : track the additional io window on this list * * Sizing the IO windows of the PCI-PCI bridge is trivial, * since these windows have 1K or 4K granularity and the IO ranges * of non-bridge PCI devices are limited to 256 bytes. * We must be careful with the ISA aliasing though. */ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size, resource_size_t add_size, struct list_head *realloc_head) { struct pci_dev *dev; struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO, IORESOURCE_IO); resource_size_t size = 0, size0 = 0, size1 = 0; resource_size_t children_add_size = 0; resource_size_t min_align, align; if (!b_res) return; min_align = window_alignment(bus, IORESOURCE_IO); list_for_each_entry(dev, &bus->devices, bus_list) { int i; for (i = 0; i < PCI_NUM_RESOURCES; i++) { struct resource *r = &dev->resource[i]; unsigned long r_size; if (r->parent || !(r->flags & IORESOURCE_IO)) continue; r_size = resource_size(r); if (r_size < 0x400) /* Might be re-aligned for ISA */ size += r_size; else size1 += r_size; align = pci_resource_alignment(dev, r); if (align > min_align) min_align = align; if (realloc_head) children_add_size += get_res_add_size(realloc_head, r); } } size0 = calculate_iosize(size, min_size, size1, resource_size(b_res), min_align); if (children_add_size > add_size) add_size = children_add_size; size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 : calculate_iosize(size, min_size, add_size + size1, resource_size(b_res), min_align); if (!size0 && !size1) { if (b_res->start || b_res->end) dev_info(&bus->self->dev, "disabling bridge window %pR to %pR (unused)\n", b_res, &bus->busn_res); b_res->flags = 0; return; } b_res->start = min_align; b_res->end = b_res->start + size0 - 1; b_res->flags |= IORESOURCE_STARTALIGN; if (size1 > size0 && realloc_head) { add_to_list(realloc_head, bus->self, b_res, size1-size0, min_align); dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window %pR to %pR add_size %llx\n", b_res, &bus->busn_res, (unsigned long long)size1-size0); } } static inline resource_size_t calculate_mem_align(resource_size_t *aligns, int max_order) { resource_size_t align = 0; resource_size_t min_align = 0; int order; for (order = 0; order <= max_order; order++) { resource_size_t align1 = 1; align1 <<= (order + 20); if (!align) min_align = align1; else if (ALIGN(align + min_align, min_align) < align1) min_align = align1 >> 1; align += aligns[order]; } return min_align; } /** * pbus_size_mem() - size the memory window of a given bus * * @bus : the bus * @mask: mask the resource flag, then compare it with type * @type: the type of free resource from bridge * @type2: second match type * @type3: third match type * @min_size : the minimum memory window that must to be allocated * @add_size : additional optional memory window * @realloc_head : track the additional memory window on this list * * Calculate the size of the bus and minimal alignment which * guarantees that all child resources fit in this size. * * Returns -ENOSPC if there's no available bus resource of the desired type. * Otherwise, sets the bus resource start/end to indicate the required * size, adds things to realloc_head (if supplied), and returns 0. */ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long type, unsigned long type2, unsigned long type3, resource_size_t min_size, resource_size_t add_size, struct list_head *realloc_head) { struct pci_dev *dev; resource_size_t min_align, align, size, size0, size1; resource_size_t aligns[18]; /* Alignments from 1Mb to 128Gb */ int order, max_order; struct resource *b_res = find_free_bus_resource(bus, mask | IORESOURCE_PREFETCH, type); resource_size_t children_add_size = 0; resource_size_t children_add_align = 0; resource_size_t add_align = 0; if (!b_res) return -ENOSPC; memset(aligns, 0, sizeof(aligns)); max_order = 0; size = 0; list_for_each_entry(dev, &bus->devices, bus_list) { int i; for (i = 0; i < PCI_NUM_RESOURCES; i++) { struct resource *r = &dev->resource[i]; resource_size_t r_size; if (r->parent || ((r->flags & mask) != type && (r->flags & mask) != type2 && (r->flags & mask) != type3)) continue; r_size = resource_size(r); #ifdef CONFIG_PCI_IOV /* put SRIOV requested res to the optional list */ if (realloc_head && i >= PCI_IOV_RESOURCES && i <= PCI_IOV_RESOURCE_END) { add_align = max(pci_resource_alignment(dev, r), add_align); r->end = r->start - 1; add_to_list(realloc_head, dev, r, r_size, 0/* don't care */); children_add_size += r_size; continue; } #endif /* * aligns[0] is for 1MB (since bridge memory * windows are always at least 1MB aligned), so * keep "order" from being negative for smaller * resources. */ align = pci_resource_alignment(dev, r); order = __ffs(align) - 20; if (order < 0) order = 0; if (order >= ARRAY_SIZE(aligns)) { dev_warn(&dev->dev, "disabling BAR %d: %pR (bad alignment %#llx)\n", i, r, (unsigned long long) align); r->flags = 0; continue; } size += r_size; /* Exclude ranges with size > align from calculation of the alignment. */ if (r_size == align) aligns[order] += align; if (order > max_order) max_order = order; if (realloc_head) { children_add_size += get_res_add_size(realloc_head, r); children_add_align = get_res_add_align(realloc_head, r); add_align = max(add_align, children_add_align); } } } min_align = calculate_mem_align(aligns, max_order); min_align = max(min_align, window_alignment(bus, b_res->flags)); size0 = calculate_memsize(size, min_size, 0, resource_size(b_res), min_align); add_align = max(min_align, add_align); if (children_add_size > add_size) add_size = children_add_size; size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 : calculate_memsize(size, min_size, add_size, resource_size(b_res), add_align); if (!size0 && !size1) { if (b_res->start || b_res->end) dev_info(&bus->self->dev, "disabling bridge window %pR to %pR (unused)\n", b_res, &bus->busn_res); b_res->flags = 0; return 0; } b_res->start = min_align; b_res->end = size0 + min_align - 1; b_res->flags |= IORESOURCE_STARTALIGN; if (size1 > size0 && realloc_head) { add_to_list(realloc_head, bus->self, b_res, size1-size0, add_align); dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window %pR to %pR add_size %llx add_align %llx\n", b_res, &bus->busn_res, (unsigned long long) (size1 - size0), (unsigned long long) add_align); } return 0; } unsigned long pci_cardbus_resource_alignment(struct resource *res) { if (res->flags & IORESOURCE_IO) return pci_cardbus_io_size; if (res->flags & IORESOURCE_MEM) return pci_cardbus_mem_size; return 0; } static void pci_bus_size_cardbus(struct pci_bus *bus, struct list_head *realloc_head) { struct pci_dev *bridge = bus->self; struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES]; resource_size_t b_res_3_size = pci_cardbus_mem_size * 2; u16 ctrl; if (b_res[0].parent) goto handle_b_res_1; /* * Reserve some resources for CardBus. We reserve * a fixed amount of bus space for CardBus bridges. */ b_res[0].start = pci_cardbus_io_size; b_res[0].end = b_res[0].start + pci_cardbus_io_size - 1; b_res[0].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN; if (realloc_head) { b_res[0].end -= pci_cardbus_io_size; add_to_list(realloc_head, bridge, b_res, pci_cardbus_io_size, pci_cardbus_io_size); } handle_b_res_1: if (b_res[1].parent) goto handle_b_res_2; b_res[1].start = pci_cardbus_io_size; b_res[1].end = b_res[1].start + pci_cardbus_io_size - 1; b_res[1].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN; if (realloc_head) { b_res[1].end -= pci_cardbus_io_size; add_to_list(realloc_head, bridge, b_res+1, pci_cardbus_io_size, pci_cardbus_io_size); } handle_b_res_2: /* MEM1 must not be pref mmio */ pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM1) { ctrl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1; pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl); pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); } /* * Check whether prefetchable memory is supported * by this bridge. */ pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) { ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0; pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl); pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); } if (b_res[2].parent) goto handle_b_res_3; /* * If we have prefetchable memory support, allocate * two regions. Otherwise, allocate one region of * twice the size. */ if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) { b_res[2].start = pci_cardbus_mem_size; b_res[2].end = b_res[2].start + pci_cardbus_mem_size - 1; b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_STARTALIGN; if (realloc_head) { b_res[2].end -= pci_cardbus_mem_size; add_to_list(realloc_head, bridge, b_res+2, pci_cardbus_mem_size, pci_cardbus_mem_size); } /* reduce that to half */ b_res_3_size = pci_cardbus_mem_size; } handle_b_res_3: if (b_res[3].parent) goto handle_done; b_res[3].start = pci_cardbus_mem_size; b_res[3].end = b_res[3].start + b_res_3_size - 1; b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_STARTALIGN; if (realloc_head) { b_res[3].end -= b_res_3_size; add_to_list(realloc_head, bridge, b_res+3, b_res_3_size, pci_cardbus_mem_size); } handle_done: ; } void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) { struct pci_dev *dev; unsigned long mask, prefmask, type2 = 0, type3 = 0; resource_size_t additional_mem_size = 0, additional_io_size = 0; struct resource *b_res; int ret; list_for_each_entry(dev, &bus->devices, bus_list) { struct pci_bus *b = dev->subordinate; if (!b) continue; switch (dev->class >> 8) { case PCI_CLASS_BRIDGE_CARDBUS: pci_bus_size_cardbus(b, realloc_head); break; case PCI_CLASS_BRIDGE_PCI: default: __pci_bus_size_bridges(b, realloc_head); break; } } /* The root bus? */ if (pci_is_root_bus(bus)) return; switch (bus->self->class >> 8) { case PCI_CLASS_BRIDGE_CARDBUS: /* don't size cardbuses yet. */ break; case PCI_CLASS_BRIDGE_PCI: pci_bridge_check_ranges(bus); if (bus->self->is_hotplug_bridge) { additional_io_size = pci_hotplug_io_size; additional_mem_size = pci_hotplug_mem_size; } /* Fall through */ default: pbus_size_io(bus, realloc_head ? 0 : additional_io_size, additional_io_size, realloc_head); /* * If there's a 64-bit prefetchable MMIO window, compute * the size required to put all 64-bit prefetchable * resources in it. */ b_res = &bus->self->resource[PCI_BRIDGE_RESOURCES]; mask = IORESOURCE_MEM; prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH; if (b_res[2].flags & IORESOURCE_MEM_64) { prefmask |= IORESOURCE_MEM_64; ret = pbus_size_mem(bus, prefmask, prefmask, prefmask, prefmask, realloc_head ? 0 : additional_mem_size, additional_mem_size, realloc_head); /* * If successful, all non-prefetchable resources * and any 32-bit prefetchable resources will go in * the non-prefetchable window. */ if (ret == 0) { mask = prefmask; type2 = prefmask & ~IORESOURCE_MEM_64; type3 = prefmask & ~IORESOURCE_PREFETCH; } } /* * If there is no 64-bit prefetchable window, compute the * size required to put all prefetchable resources in the * 32-bit prefetchable window (if there is one). */ if (!type2) { prefmask &= ~IORESOURCE_MEM_64; ret = pbus_size_mem(bus, prefmask, prefmask, prefmask, prefmask, realloc_head ? 0 : additional_mem_size, additional_mem_size, realloc_head); /* * If successful, only non-prefetchable resources * will go in the non-prefetchable window. */ if (ret == 0) mask = prefmask; else additional_mem_size += additional_mem_size; type2 = type3 = IORESOURCE_MEM; } /* * Compute the size required to put everything else in the * non-prefetchable window. This includes: * * - all non-prefetchable resources * - 32-bit prefetchable resources if there's a 64-bit * prefetchable window or no prefetchable window at all * - 64-bit prefetchable resources if there's no * prefetchable window at all * * Note that the strategy in __pci_assign_resource() must * match that used here. Specifically, we cannot put a * 32-bit prefetchable resource in a 64-bit prefetchable * window. */ pbus_size_mem(bus, mask, IORESOURCE_MEM, type2, type3, realloc_head ? 0 : additional_mem_size, additional_mem_size, realloc_head); break; } } void pci_bus_size_bridges(struct pci_bus *bus) { __pci_bus_size_bridges(bus, NULL); } EXPORT_SYMBOL(pci_bus_size_bridges); void __pci_bus_assign_resources(const struct pci_bus *bus, struct list_head *realloc_head, struct list_head *fail_head) { struct pci_bus *b; struct pci_dev *dev; pbus_assign_resources_sorted(bus, realloc_head, fail_head); list_for_each_entry(dev, &bus->devices, bus_list) { b = dev->subordinate; if (!b) continue; __pci_bus_assign_resources(b, realloc_head, fail_head); switch (dev->class >> 8) { case PCI_CLASS_BRIDGE_PCI: if (!pci_is_enabled(dev)) pci_setup_bridge(b); break; case PCI_CLASS_BRIDGE_CARDBUS: pci_setup_cardbus(b); break; default: dev_info(&dev->dev, "not setting up bridge for bus %04x:%02x\n", pci_domain_nr(b), b->number); break; } } } void pci_bus_assign_resources(const struct pci_bus *bus) { __pci_bus_assign_resources(bus, NULL, NULL); } EXPORT_SYMBOL(pci_bus_assign_resources); static void __pci_bridge_assign_resources(const struct pci_dev *bridge, struct list_head *add_head, struct list_head *fail_head) { struct pci_bus *b; pdev_assign_resources_sorted((struct pci_dev *)bridge, add_head, fail_head); b = bridge->subordinate; if (!b) return; __pci_bus_assign_resources(b, add_head, fail_head); switch (bridge->class >> 8) { case PCI_CLASS_BRIDGE_PCI: pci_setup_bridge(b); break; case PCI_CLASS_BRIDGE_CARDBUS: pci_setup_cardbus(b); break; default: dev_info(&bridge->dev, "not setting up bridge for bus %04x:%02x\n", pci_domain_nr(b), b->number); break; } } static void pci_bridge_release_resources(struct pci_bus *bus, unsigned long type) { struct pci_dev *dev = bus->self; struct resource *r; unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_MEM_64; unsigned old_flags = 0; struct resource *b_res; int idx = 1; b_res = &dev->resource[PCI_BRIDGE_RESOURCES]; /* * 1. if there is io port assign fail, will release bridge * io port. * 2. if there is non pref mmio assign fail, release bridge * nonpref mmio. * 3. if there is 64bit pref mmio assign fail, and bridge pref * is 64bit, release bridge pref mmio. * 4. if there is pref mmio assign fail, and bridge pref is * 32bit mmio, release bridge pref mmio * 5. if there is pref mmio assign fail, and bridge pref is not * assigned, release bridge nonpref mmio. */ if (type & IORESOURCE_IO) idx = 0; else if (!(type & IORESOURCE_PREFETCH)) idx = 1; else if ((type & IORESOURCE_MEM_64) && (b_res[2].flags & IORESOURCE_MEM_64)) idx = 2; else if (!(b_res[2].flags & IORESOURCE_MEM_64) && (b_res[2].flags & IORESOURCE_PREFETCH)) idx = 2; else idx = 1; r = &b_res[idx]; if (!r->parent) return; /* * if there are children under that, we should release them * all */ release_child_resources(r); if (!release_resource(r)) { type = old_flags = r->flags & type_mask; dev_printk(KERN_DEBUG, &dev->dev, "resource %d %pR released\n", PCI_BRIDGE_RESOURCES + idx, r); /* keep the old size */ r->end = resource_size(r) - 1; r->start = 0; r->flags = 0; /* avoiding touch the one without PREF */ if (type & IORESOURCE_PREFETCH) type = IORESOURCE_PREFETCH; __pci_setup_bridge(bus, type); /* for next child res under same bridge */ r->flags = old_flags; } } enum release_type { leaf_only, whole_subtree, }; /* * try to release pci bridge resources that is from leaf bridge, * so we can allocate big new one later */ static void pci_bus_release_bridge_resources(struct pci_bus *bus, unsigned long type, enum release_type rel_type) { struct pci_dev *dev; bool is_leaf_bridge = true; list_for_each_entry(dev, &bus->devices, bus_list) { struct pci_bus *b = dev->subordinate; if (!b) continue; is_leaf_bridge = false; if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI) continue; if (rel_type == whole_subtree) pci_bus_release_bridge_resources(b, type, whole_subtree); } if (pci_is_root_bus(bus)) return; if ((bus->self->class >> 8) != PCI_CLASS_BRIDGE_PCI) return; if ((rel_type == whole_subtree) || is_leaf_bridge) pci_bridge_release_resources(bus, type); } static void pci_bus_dump_res(struct pci_bus *bus) { struct resource *res; int i; pci_bus_for_each_resource(bus, res, i) { if (!res || !res->end || !res->flags) continue; dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res); } } static void pci_bus_dump_resources(struct pci_bus *bus) { struct pci_bus *b; struct pci_dev *dev; pci_bus_dump_res(bus); list_for_each_entry(dev, &bus->devices, bus_list) { b = dev->subordinate; if (!b) continue; pci_bus_dump_resources(b); } } static int pci_bus_get_depth(struct pci_bus *bus) { int depth = 0; struct pci_bus *child_bus; list_for_each_entry(child_bus, &bus->children, node) { int ret; ret = pci_bus_get_depth(child_bus); if (ret + 1 > depth) depth = ret + 1; } return depth; } /* * -1: undefined, will auto detect later * 0: disabled by user * 1: disabled by auto detect * 2: enabled by user * 3: enabled by auto detect */ enum enable_type { undefined = -1, user_disabled, auto_disabled, user_enabled, auto_enabled, }; static enum enable_type pci_realloc_enable = undefined; void __init pci_realloc_get_opt(char *str) { if (!strncmp(str, "off", 3)) pci_realloc_enable = user_disabled; else if (!strncmp(str, "on", 2)) pci_realloc_enable = user_enabled; } static bool pci_realloc_enabled(enum enable_type enable) { return enable >= user_enabled; } #if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO) static int iov_resources_unassigned(struct pci_dev *dev, void *data) { int i; bool *unassigned = data; for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) { struct resource *r = &dev->resource[i]; struct pci_bus_region region; /* Not assigned or rejected by kernel? */ if (!r->flags) continue; pcibios_resource_to_bus(dev->bus, ®ion, r); if (!region.start) { *unassigned = true; return 1; /* return early from pci_walk_bus() */ } } return 0; } static enum enable_type pci_realloc_detect(struct pci_bus *bus, enum enable_type enable_local) { bool unassigned = false; if (enable_local != undefined) return enable_local; pci_walk_bus(bus, iov_resources_unassigned, &unassigned); if (unassigned) return auto_enabled; return enable_local; } #else static enum enable_type pci_realloc_detect(struct pci_bus *bus, enum enable_type enable_local) { return enable_local; } #endif /* * first try will not touch pci bridge res * second and later try will clear small leaf bridge res * will stop till to the max depth if can not find good one */ void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus) { LIST_HEAD(realloc_head); /* list of resources that want additional resources */ struct list_head *add_list = NULL; int tried_times = 0; enum release_type rel_type = leaf_only; LIST_HEAD(fail_head); struct pci_dev_resource *fail_res; unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_MEM_64; int pci_try_num = 1; enum enable_type enable_local; /* don't realloc if asked to do so */ enable_local = pci_realloc_detect(bus, pci_realloc_enable); if (pci_realloc_enabled(enable_local)) { int max_depth = pci_bus_get_depth(bus); pci_try_num = max_depth + 1; dev_printk(KERN_DEBUG, &bus->dev, "max bus depth: %d pci_try_num: %d\n", max_depth, pci_try_num); } again: /* * last try will use add_list, otherwise will try good to have as * must have, so can realloc parent bridge resource */ if (tried_times + 1 == pci_try_num) add_list = &realloc_head; /* Depth first, calculate sizes and alignments of all subordinate buses. */ __pci_bus_size_bridges(bus, add_list); /* Depth last, allocate resources and update the hardware. */ __pci_bus_assign_resources(bus, add_list, &fail_head); if (add_list) BUG_ON(!list_empty(add_list)); tried_times++; /* any device complain? */ if (list_empty(&fail_head)) goto dump; if (tried_times >= pci_try_num) { if (enable_local == undefined) dev_info(&bus->dev, "Some PCI device resources are unassigned, try booting with pci=realloc\n"); else if (enable_local == auto_enabled) dev_info(&bus->dev, "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n"); free_list(&fail_head); goto dump; } dev_printk(KERN_DEBUG, &bus->dev, "No. %d try to assign unassigned res\n", tried_times + 1); /* third times and later will not check if it is leaf */ if ((tried_times + 1) > 2) rel_type = whole_subtree; /* * Try to release leaf bridge's resources that doesn't fit resource of * child device under that bridge */ list_for_each_entry(fail_res, &fail_head, list) pci_bus_release_bridge_resources(fail_res->dev->bus, fail_res->flags & type_mask, rel_type); /* restore size and flags */ list_for_each_entry(fail_res, &fail_head, list) { struct resource *res = fail_res->res; res->start = fail_res->start; res->end = fail_res->end; res->flags = fail_res->flags; if (fail_res->dev->subordinate) res->flags = 0; } free_list(&fail_head); goto again; dump: /* dump the resource on buses */ pci_bus_dump_resources(bus); } void __init pci_assign_unassigned_resources(void) { struct pci_bus *root_bus; list_for_each_entry(root_bus, &pci_root_buses, node) pci_assign_unassigned_root_bus_resources(root_bus); } void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge) { struct pci_bus *parent = bridge->subordinate; LIST_HEAD(add_list); /* list of resources that want additional resources */ int tried_times = 0; LIST_HEAD(fail_head); struct pci_dev_resource *fail_res; int retval; unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_MEM_64; again: __pci_bus_size_bridges(parent, &add_list); __pci_bridge_assign_resources(bridge, &add_list, &fail_head); BUG_ON(!list_empty(&add_list)); tried_times++; if (list_empty(&fail_head)) goto enable_all; if (tried_times >= 2) { /* still fail, don't need to try more */ free_list(&fail_head); goto enable_all; } printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n", tried_times + 1); /* * Try to release leaf bridge's resources that doesn't fit resource of * child device under that bridge */ list_for_each_entry(fail_res, &fail_head, list) pci_bus_release_bridge_resources(fail_res->dev->bus, fail_res->flags & type_mask, whole_subtree); /* restore size and flags */ list_for_each_entry(fail_res, &fail_head, list) { struct resource *res = fail_res->res; res->start = fail_res->start; res->end = fail_res->end; res->flags = fail_res->flags; if (fail_res->dev->subordinate) res->flags = 0; } free_list(&fail_head); goto again; enable_all: retval = pci_reenable_device(bridge); if (retval) dev_err(&bridge->dev, "Error reenabling bridge (%d)\n", retval); pci_set_master(bridge); } EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources); void pci_assign_unassigned_bus_resources(struct pci_bus *bus) { struct pci_dev *dev; LIST_HEAD(add_list); /* list of resources that want additional resources */ down_read(&pci_bus_sem); list_for_each_entry(dev, &bus->devices, bus_list) if (pci_is_bridge(dev) && pci_has_subordinate(dev)) __pci_bus_size_bridges(dev->subordinate, &add_list); up_read(&pci_bus_sem); __pci_bus_assign_resources(bus, &add_list, NULL); BUG_ON(!list_empty(&add_list)); }