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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Support routines for initializing a PCI subsystem
- *
- * Extruded from code written by
- * Dave Rusling ([email protected])
- * David Mosberger ([email protected])
- * David Miller ([email protected])
- *
- * Nov 2000, Ivan Kokshaysky <[email protected]>
- * PCI-PCI bridges cleanup, sorted resource allocation.
- * Feb 2002, Ivan Kokshaysky <[email protected]>
- * Converted to allocation in 3 passes, which gives
- * tighter packing. Prefetchable range support.
- */
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/pci.h>
- #include <linux/errno.h>
- #include <linux/ioport.h>
- #include <linux/cache.h>
- #include <linux/slab.h>
- #include <linux/acpi.h>
- #include "pci.h"
- unsigned int pci_flags;
- EXPORT_SYMBOL_GPL(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 to which the resource belongs
- * @res: Resource to be tracked
- * @add_size: Additional size to be optionally added to the resource
- * @min_align: Minimum memory window alignment
- */
- 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)
- 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)
- 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) {
- pci_warn(dev, "BAR %d: %pR has bogus alignment\n",
- i, r);
- continue;
- }
- tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
- if (!tmp)
- panic("%s: kzalloc() failed!\n", __func__);
- 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))
- pci_info(add_res->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 be 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 resource is a 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 IO port assignment fails, will release assigned IO
- * port.
- * 2. If pref MMIO assignment fails, release assigned pref
- * MMIO. If assigned pref MMIO's parent is non-pref MMIO
- * and non-pref MMIO assignment fails, will release that
- * assigned pref MMIO.
- * 3. If non-pref MMIO assignment fails or pref MMIO
- * assignment fails, 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 alignment so 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) {
- resource_size_t r_size = resource_size(dev_res->res);
- dev_res->res->start = add_align;
- dev_res->res->end = add_align + r_size - 1;
- 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);
- break;
- }
- }
- }
- }
- /* 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;
- pci_info(bridge, "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.
- */
- pci_info(bridge, " 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) {
- pci_info(bridge, " 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) {
- pci_info(bridge, " 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) {
- pci_info(bridge, " 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
- * are no I/O ports or memory behind the bridge, the 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_IO_WINDOW];
- 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);
- pci_info(bridge, " 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_MEM_WINDOW];
- pcibios_resource_to_bus(bridge->bus, ®ion, res);
- if (res->flags & IORESOURCE_MEM) {
- l = (region.start >> 16) & 0xfff0;
- l |= region.end & 0xfff00000;
- pci_info(bridge, " 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_PREF_MEM_WINDOW];
- 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);
- }
- pci_info(bridge, " 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;
- pci_info(bridge, "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 __weak pcibios_setup_bridge(struct pci_bus *bus, unsigned long type)
- {
- }
- void pci_setup_bridge(struct pci_bus *bus)
- {
- unsigned long type = IORESOURCE_IO | IORESOURCE_MEM |
- IORESOURCE_PREFETCH;
- pcibios_setup_bridge(bus, type);
- __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) {
- case PCI_BRIDGE_IO_WINDOW:
- pci_setup_bridge_io(bridge);
- break;
- case PCI_BRIDGE_MEM_WINDOW:
- pci_setup_bridge_mmio(bridge);
- break;
- case PCI_BRIDGE_PREF_MEM_WINDOW:
- 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)
- {
- struct pci_dev *bridge = bus->self;
- struct resource *b_res;
- b_res = &bridge->resource[PCI_BRIDGE_MEM_WINDOW];
- b_res->flags |= IORESOURCE_MEM;
- if (bridge->io_window) {
- b_res = &bridge->resource[PCI_BRIDGE_IO_WINDOW];
- b_res->flags |= IORESOURCE_IO;
- }
- if (bridge->pref_window) {
- b_res = &bridge->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
- b_res->flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
- if (bridge->pref_64_window) {
- b_res->flags |= IORESOURCE_MEM_64 |
- PCI_PREF_RANGE_TYPE_64;
- }
- }
- }
- /*
- * Helper function for sizing routines. Assigned resources have non-NULL
- * parent resource.
- *
- * Return first unassigned resource of the correct type. If there is none,
- * return first assigned resource of the correct type. If none of the
- * above, return NULL.
- *
- * Returning an assigned resource of the correct type allows the caller to
- * distinguish between already assigned and no resource of the correct type.
- */
- static struct resource *find_bus_resource_of_type(struct pci_bus *bus,
- unsigned long type_mask,
- unsigned long type)
- {
- struct resource *r, *r_assigned = NULL;
- int i;
- 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;
- if (r && (r->flags & type_mask) == type && !r_assigned)
- r_assigned = r;
- }
- return r_assigned;
- }
- static resource_size_t calculate_iosize(resource_size_t size,
- resource_size_t min_size,
- resource_size_t size1,
- resource_size_t add_size,
- resource_size_t children_add_size,
- 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 = size + size1;
- if (size < old_size)
- size = old_size;
- size = ALIGN(max(size, add_size) + children_add_size, align);
- return size;
- }
- static resource_size_t calculate_memsize(resource_size_t size,
- resource_size_t min_size,
- resource_size_t add_size,
- resource_size_t children_add_size,
- 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(max(size, add_size) + children_add_size, 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 && 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 I/O window of a given bus
- *
- * @bus: The bus
- * @min_size: The minimum I/O window that must be allocated
- * @add_size: Additional optional I/O window
- * @realloc_head: Track the additional I/O window on this list
- *
- * Sizing the I/O windows of the PCI-PCI bridge is trivial, since these
- * windows have 1K or 4K granularity and the I/O 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_bus_resource_of_type(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;
- /* If resource is already assigned, nothing more to do */
- if (b_res->parent)
- 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, 0, 0,
- resource_size(b_res), min_align);
- size1 = (!realloc_head || (realloc_head && !add_size && !children_add_size)) ? size0 :
- calculate_iosize(size, min_size, size1, add_size, children_add_size,
- resource_size(b_res), min_align);
- if (!size0 && !size1) {
- if (bus->self && (b_res->start || b_res->end))
- pci_info(bus->self, "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 (bus->self && size1 > size0 && realloc_head) {
- add_to_list(realloc_head, bus->self, b_res, size1-size0,
- min_align);
- pci_info(bus->self, "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 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.
- *
- * Return -ENOSPC if there's no available bus resource of the desired
- * type. Otherwise, set the bus resource start/end to indicate the
- * required size, add things to realloc_head (if supplied), and return 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[24]; /* Alignments from 1MB to 8TB */
- int order, max_order;
- struct resource *b_res = find_bus_resource_of_type(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;
- /* If resource is already assigned, nothing more to do */
- if (b_res->parent)
- return 0;
- 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 & IORESOURCE_PCI_FIXED) ||
- ((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)) {
- pci_warn(dev, "disabling BAR %d: %pR (bad alignment %#llx)\n",
- i, r, (unsigned long long) align);
- r->flags = 0;
- continue;
- }
- size += max(r_size, align);
- /*
- * 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, 0, resource_size(b_res), min_align);
- add_align = max(min_align, add_align);
- size1 = (!realloc_head || (realloc_head && !add_size && !children_add_size)) ? size0 :
- calculate_memsize(size, min_size, add_size, children_add_size,
- resource_size(b_res), add_align);
- if (!size0 && !size1) {
- if (bus->self && (b_res->start || b_res->end))
- pci_info(bus->self, "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 (bus->self && size1 > size0 && realloc_head) {
- add_to_list(realloc_head, bus->self, b_res, size1-size0, add_align);
- pci_info(bus->self, "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;
- resource_size_t b_res_3_size = pci_cardbus_mem_size * 2;
- u16 ctrl;
- b_res = &bridge->resource[PCI_CB_BRIDGE_IO_0_WINDOW];
- if (b_res->parent)
- goto handle_b_res_1;
- /*
- * Reserve some resources for CardBus. We reserve a fixed amount
- * of bus space for CardBus bridges.
- */
- b_res->start = pci_cardbus_io_size;
- b_res->end = b_res->start + pci_cardbus_io_size - 1;
- b_res->flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
- if (realloc_head) {
- b_res->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:
- b_res = &bridge->resource[PCI_CB_BRIDGE_IO_1_WINDOW];
- if (b_res->parent)
- goto handle_b_res_2;
- b_res->start = pci_cardbus_io_size;
- b_res->end = b_res->start + pci_cardbus_io_size - 1;
- b_res->flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
- if (realloc_head) {
- b_res->end -= pci_cardbus_io_size;
- add_to_list(realloc_head, bridge, b_res, 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);
- }
- b_res = &bridge->resource[PCI_CB_BRIDGE_MEM_0_WINDOW];
- if (b_res->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->start = pci_cardbus_mem_size;
- b_res->end = b_res->start + pci_cardbus_mem_size - 1;
- b_res->flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH |
- IORESOURCE_STARTALIGN;
- if (realloc_head) {
- b_res->end -= pci_cardbus_mem_size;
- add_to_list(realloc_head, bridge, b_res,
- pci_cardbus_mem_size, pci_cardbus_mem_size);
- }
- /* Reduce that to half */
- b_res_3_size = pci_cardbus_mem_size;
- }
- handle_b_res_3:
- b_res = &bridge->resource[PCI_CB_BRIDGE_MEM_1_WINDOW];
- if (b_res->parent)
- goto handle_done;
- b_res->start = pci_cardbus_mem_size;
- b_res->end = b_res->start + b_res_3_size - 1;
- b_res->flags |= IORESOURCE_MEM | IORESOURCE_STARTALIGN;
- if (realloc_head) {
- b_res->end -= b_res_3_size;
- add_to_list(realloc_head, bridge, b_res, 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_io_size = 0, additional_mmio_size = 0,
- additional_mmio_pref_size = 0;
- struct resource *pref;
- struct pci_host_bridge *host;
- int hdr_type, i, ret;
- list_for_each_entry(dev, &bus->devices, bus_list) {
- struct pci_bus *b = dev->subordinate;
- if (!b)
- continue;
- switch (dev->hdr_type) {
- case PCI_HEADER_TYPE_CARDBUS:
- pci_bus_size_cardbus(b, realloc_head);
- break;
- case PCI_HEADER_TYPE_BRIDGE:
- default:
- __pci_bus_size_bridges(b, realloc_head);
- break;
- }
- }
- /* The root bus? */
- if (pci_is_root_bus(bus)) {
- host = to_pci_host_bridge(bus->bridge);
- if (!host->size_windows)
- return;
- pci_bus_for_each_resource(bus, pref, i)
- if (pref && (pref->flags & IORESOURCE_PREFETCH))
- break;
- hdr_type = -1; /* Intentionally invalid - not a PCI device. */
- } else {
- pref = &bus->self->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
- hdr_type = bus->self->hdr_type;
- }
- switch (hdr_type) {
- case PCI_HEADER_TYPE_CARDBUS:
- /* Don't size CardBuses yet */
- break;
- case PCI_HEADER_TYPE_BRIDGE:
- pci_bridge_check_ranges(bus);
- if (bus->self->is_hotplug_bridge) {
- additional_io_size = pci_hotplug_io_size;
- additional_mmio_size = pci_hotplug_mmio_size;
- additional_mmio_pref_size = pci_hotplug_mmio_pref_size;
- }
- fallthrough;
- 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.
- */
- mask = IORESOURCE_MEM;
- prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
- if (pref && (pref->flags & IORESOURCE_MEM_64)) {
- prefmask |= IORESOURCE_MEM_64;
- ret = pbus_size_mem(bus, prefmask, prefmask,
- prefmask, prefmask,
- realloc_head ? 0 : additional_mmio_pref_size,
- additional_mmio_pref_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_mmio_pref_size,
- additional_mmio_pref_size, realloc_head);
- /*
- * If successful, only non-prefetchable resources
- * will go in the non-prefetchable window.
- */
- if (ret == 0)
- mask = prefmask;
- else
- additional_mmio_size += additional_mmio_pref_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_mmio_size,
- additional_mmio_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);
- static void assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r)
- {
- int i;
- struct resource *parent_r;
- unsigned long mask = IORESOURCE_IO | IORESOURCE_MEM |
- IORESOURCE_PREFETCH;
- pci_bus_for_each_resource(b, parent_r, i) {
- if (!parent_r)
- continue;
- if ((r->flags & mask) == (parent_r->flags & mask) &&
- resource_contains(parent_r, r))
- request_resource(parent_r, r);
- }
- }
- /*
- * Try to assign any resources marked as IORESOURCE_PCI_FIXED, as they are
- * skipped by pbus_assign_resources_sorted().
- */
- static void pdev_assign_fixed_resources(struct pci_dev *dev)
- {
- int i;
- for (i = 0; i < PCI_NUM_RESOURCES; i++) {
- struct pci_bus *b;
- struct resource *r = &dev->resource[i];
- if (r->parent || !(r->flags & IORESOURCE_PCI_FIXED) ||
- !(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
- continue;
- b = dev->bus;
- while (b && !r->parent) {
- assign_fixed_resource_on_bus(b, r);
- b = b->parent;
- }
- }
- }
- 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) {
- pdev_assign_fixed_resources(dev);
- b = dev->subordinate;
- if (!b)
- continue;
- __pci_bus_assign_resources(b, realloc_head, fail_head);
- switch (dev->hdr_type) {
- case PCI_HEADER_TYPE_BRIDGE:
- if (!pci_is_enabled(dev))
- pci_setup_bridge(b);
- break;
- case PCI_HEADER_TYPE_CARDBUS:
- pci_setup_cardbus(b);
- break;
- default:
- pci_info(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_claim_device_resources(struct pci_dev *dev)
- {
- int i;
- for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
- struct resource *r = &dev->resource[i];
- if (!r->flags || r->parent)
- continue;
- pci_claim_resource(dev, i);
- }
- }
- static void pci_claim_bridge_resources(struct pci_dev *dev)
- {
- int i;
- for (i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) {
- struct resource *r = &dev->resource[i];
- if (!r->flags || r->parent)
- continue;
- pci_claim_bridge_resource(dev, i);
- }
- }
- static void pci_bus_allocate_dev_resources(struct pci_bus *b)
- {
- struct pci_dev *dev;
- struct pci_bus *child;
- list_for_each_entry(dev, &b->devices, bus_list) {
- pci_claim_device_resources(dev);
- child = dev->subordinate;
- if (child)
- pci_bus_allocate_dev_resources(child);
- }
- }
- static void pci_bus_allocate_resources(struct pci_bus *b)
- {
- struct pci_bus *child;
- /*
- * Carry out a depth-first search on the PCI bus tree to allocate
- * bridge apertures. Read the programmed bridge bases and
- * recursively claim the respective bridge resources.
- */
- if (b->self) {
- pci_read_bridge_bases(b);
- pci_claim_bridge_resources(b->self);
- }
- list_for_each_entry(child, &b->children, node)
- pci_bus_allocate_resources(child);
- }
- void pci_bus_claim_resources(struct pci_bus *b)
- {
- pci_bus_allocate_resources(b);
- pci_bus_allocate_dev_resources(b);
- }
- EXPORT_SYMBOL(pci_bus_claim_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:
- pci_info(bridge, "not setting up bridge for bus %04x:%02x\n",
- pci_domain_nr(b), b->number);
- break;
- }
- }
- #define PCI_RES_TYPE_MASK \
- (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH |\
- IORESOURCE_MEM_64)
- static void pci_bridge_release_resources(struct pci_bus *bus,
- unsigned long type)
- {
- struct pci_dev *dev = bus->self;
- struct resource *r;
- unsigned int old_flags;
- struct resource *b_res;
- int idx = 1;
- b_res = &dev->resource[PCI_BRIDGE_RESOURCES];
- /*
- * 1. If IO port assignment fails, release bridge IO port.
- * 2. If non pref MMIO assignment fails, release bridge nonpref MMIO.
- * 3. If 64bit pref MMIO assignment fails, and bridge pref is 64bit,
- * release bridge pref MMIO.
- * 4. If pref MMIO assignment fails, and bridge pref is 32bit,
- * release bridge pref MMIO.
- * 5. If pref MMIO assignment fails, 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, release them all */
- release_child_resources(r);
- if (!release_resource(r)) {
- type = old_flags = r->flags & PCI_RES_TYPE_MASK;
- pci_info(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 from leaf bridge, so we can allocate
- * a larger window 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_info(&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 = 0; i < PCI_SRIOV_NUM_BARS; i++) {
- struct resource *r = &dev->resource[i + PCI_IOV_RESOURCES];
- 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;
- struct pci_host_bridge *host;
- if (enable_local != undefined)
- return enable_local;
- host = pci_find_host_bridge(bus);
- if (host->preserve_config)
- return auto_disabled;
- 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
- static void adjust_bridge_window(struct pci_dev *bridge, struct resource *res,
- struct list_head *add_list,
- resource_size_t new_size)
- {
- resource_size_t add_size, size = resource_size(res);
- if (res->parent)
- return;
- if (!new_size)
- return;
- if (new_size > size) {
- add_size = new_size - size;
- pci_dbg(bridge, "bridge window %pR extended by %pa\n", res,
- &add_size);
- } else if (new_size < size) {
- add_size = size - new_size;
- pci_dbg(bridge, "bridge window %pR shrunken by %pa\n", res,
- &add_size);
- } else {
- return;
- }
- res->end = res->start + new_size - 1;
- /* If the resource is part of the add_list, remove it now */
- if (add_list)
- remove_from_list(add_list, res);
- }
- static void remove_dev_resource(struct resource *avail, struct pci_dev *dev,
- struct resource *res)
- {
- resource_size_t size, align, tmp;
- size = resource_size(res);
- if (!size)
- return;
- align = pci_resource_alignment(dev, res);
- align = align ? ALIGN(avail->start, align) - avail->start : 0;
- tmp = align + size;
- avail->start = min(avail->start + tmp, avail->end + 1);
- }
- static void remove_dev_resources(struct pci_dev *dev, struct resource *io,
- struct resource *mmio,
- struct resource *mmio_pref)
- {
- int i;
- for (i = 0; i < PCI_NUM_RESOURCES; i++) {
- struct resource *res = &dev->resource[i];
- if (resource_type(res) == IORESOURCE_IO) {
- remove_dev_resource(io, dev, res);
- } else if (resource_type(res) == IORESOURCE_MEM) {
- /*
- * Make sure prefetchable memory is reduced from
- * the correct resource. Specifically we put 32-bit
- * prefetchable memory in non-prefetchable window
- * if there is an 64-bit pretchable window.
- *
- * See comments in __pci_bus_size_bridges() for
- * more information.
- */
- if ((res->flags & IORESOURCE_PREFETCH) &&
- ((res->flags & IORESOURCE_MEM_64) ==
- (mmio_pref->flags & IORESOURCE_MEM_64)))
- remove_dev_resource(mmio_pref, dev, res);
- else
- remove_dev_resource(mmio, dev, res);
- }
- }
- }
- /*
- * io, mmio and mmio_pref contain the total amount of bridge window space
- * available. This includes the minimal space needed to cover all the
- * existing devices on the bus and the possible extra space that can be
- * shared with the bridges.
- */
- static void pci_bus_distribute_available_resources(struct pci_bus *bus,
- struct list_head *add_list,
- struct resource io,
- struct resource mmio,
- struct resource mmio_pref)
- {
- unsigned int normal_bridges = 0, hotplug_bridges = 0;
- struct resource *io_res, *mmio_res, *mmio_pref_res;
- struct pci_dev *dev, *bridge = bus->self;
- resource_size_t io_per_b, mmio_per_b, mmio_pref_per_b, align;
- io_res = &bridge->resource[PCI_BRIDGE_IO_WINDOW];
- mmio_res = &bridge->resource[PCI_BRIDGE_MEM_WINDOW];
- mmio_pref_res = &bridge->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
- /*
- * The alignment of this bridge is yet to be considered, hence it must
- * be done now before extending its bridge window.
- */
- align = pci_resource_alignment(bridge, io_res);
- if (!io_res->parent && align)
- io.start = min(ALIGN(io.start, align), io.end + 1);
- align = pci_resource_alignment(bridge, mmio_res);
- if (!mmio_res->parent && align)
- mmio.start = min(ALIGN(mmio.start, align), mmio.end + 1);
- align = pci_resource_alignment(bridge, mmio_pref_res);
- if (!mmio_pref_res->parent && align)
- mmio_pref.start = min(ALIGN(mmio_pref.start, align),
- mmio_pref.end + 1);
- /*
- * Now that we have adjusted for alignment, update the bridge window
- * resources to fill as much remaining resource space as possible.
- */
- adjust_bridge_window(bridge, io_res, add_list, resource_size(&io));
- adjust_bridge_window(bridge, mmio_res, add_list, resource_size(&mmio));
- adjust_bridge_window(bridge, mmio_pref_res, add_list,
- resource_size(&mmio_pref));
- /*
- * Calculate how many hotplug bridges and normal bridges there
- * are on this bus. We will distribute the additional available
- * resources between hotplug bridges.
- */
- for_each_pci_bridge(dev, bus) {
- if (dev->is_hotplug_bridge)
- hotplug_bridges++;
- else
- normal_bridges++;
- }
- if (!(hotplug_bridges + normal_bridges))
- return;
- /*
- * Calculate the amount of space we can forward from "bus" to any
- * downstream buses, i.e., the space left over after assigning the
- * BARs and windows on "bus".
- */
- list_for_each_entry(dev, &bus->devices, bus_list) {
- if (!dev->is_virtfn)
- remove_dev_resources(dev, &io, &mmio, &mmio_pref);
- }
- /*
- * If there is at least one hotplug bridge on this bus it gets all
- * the extra resource space that was left after the reductions
- * above.
- *
- * If there are no hotplug bridges the extra resource space is
- * split between non-hotplug bridges. This is to allow possible
- * hotplug bridges below them to get the extra space as well.
- */
- if (hotplug_bridges) {
- io_per_b = div64_ul(resource_size(&io), hotplug_bridges);
- mmio_per_b = div64_ul(resource_size(&mmio), hotplug_bridges);
- mmio_pref_per_b = div64_ul(resource_size(&mmio_pref),
- hotplug_bridges);
- } else {
- io_per_b = div64_ul(resource_size(&io), normal_bridges);
- mmio_per_b = div64_ul(resource_size(&mmio), normal_bridges);
- mmio_pref_per_b = div64_ul(resource_size(&mmio_pref),
- normal_bridges);
- }
- for_each_pci_bridge(dev, bus) {
- struct resource *res;
- struct pci_bus *b;
- b = dev->subordinate;
- if (!b)
- continue;
- if (hotplug_bridges && !dev->is_hotplug_bridge)
- continue;
- res = &dev->resource[PCI_BRIDGE_IO_WINDOW];
- /*
- * Make sure the split resource space is properly aligned
- * for bridge windows (align it down to avoid going above
- * what is available).
- */
- align = pci_resource_alignment(dev, res);
- io.end = align ? io.start + ALIGN_DOWN(io_per_b, align) - 1
- : io.start + io_per_b - 1;
- /*
- * The x_per_b holds the extra resource space that can be
- * added for each bridge but there is the minimal already
- * reserved as well so adjust x.start down accordingly to
- * cover the whole space.
- */
- io.start -= resource_size(res);
- res = &dev->resource[PCI_BRIDGE_MEM_WINDOW];
- align = pci_resource_alignment(dev, res);
- mmio.end = align ? mmio.start + ALIGN_DOWN(mmio_per_b, align) - 1
- : mmio.start + mmio_per_b - 1;
- mmio.start -= resource_size(res);
- res = &dev->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
- align = pci_resource_alignment(dev, res);
- mmio_pref.end = align ? mmio_pref.start +
- ALIGN_DOWN(mmio_pref_per_b, align) - 1
- : mmio_pref.start + mmio_pref_per_b - 1;
- mmio_pref.start -= resource_size(res);
- pci_bus_distribute_available_resources(b, add_list, io, mmio,
- mmio_pref);
- io.start += io.end + 1;
- mmio.start += mmio.end + 1;
- mmio_pref.start += mmio_pref.end + 1;
- }
- }
- static void pci_bridge_distribute_available_resources(struct pci_dev *bridge,
- struct list_head *add_list)
- {
- struct resource available_io, available_mmio, available_mmio_pref;
- if (!bridge->is_hotplug_bridge)
- return;
- pci_dbg(bridge, "distributing available resources\n");
- /* Take the initial extra resources from the hotplug port */
- available_io = bridge->resource[PCI_BRIDGE_IO_WINDOW];
- available_mmio = bridge->resource[PCI_BRIDGE_MEM_WINDOW];
- available_mmio_pref = bridge->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
- pci_bus_distribute_available_resources(bridge->subordinate,
- add_list, available_io,
- available_mmio,
- available_mmio_pref);
- }
- static bool pci_bridge_resources_not_assigned(struct pci_dev *dev)
- {
- const struct resource *r;
- /*
- * If the child device's resources are not yet assigned it means we
- * are configuring them (not the boot firmware), so we should be
- * able to extend the upstream bridge resources in the same way we
- * do with the normal hotplug case.
- */
- r = &dev->resource[PCI_BRIDGE_IO_WINDOW];
- if (r->flags && !(r->flags & IORESOURCE_STARTALIGN))
- return false;
- r = &dev->resource[PCI_BRIDGE_MEM_WINDOW];
- if (r->flags && !(r->flags & IORESOURCE_STARTALIGN))
- return false;
- r = &dev->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
- if (r->flags && !(r->flags & IORESOURCE_STARTALIGN))
- return false;
- return true;
- }
- static void
- pci_root_bus_distribute_available_resources(struct pci_bus *bus,
- struct list_head *add_list)
- {
- struct pci_dev *dev, *bridge = bus->self;
- for_each_pci_bridge(dev, bus) {
- struct pci_bus *b;
- b = dev->subordinate;
- if (!b)
- continue;
- /*
- * Need to check "bridge" here too because it is NULL
- * in case of root bus.
- */
- if (bridge && pci_bridge_resources_not_assigned(dev))
- pci_bridge_distribute_available_resources(bridge,
- add_list);
- else
- pci_root_bus_distribute_available_resources(b, add_list);
- }
- }
- /*
- * 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;
- 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_info(&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);
- pci_root_bus_distribute_available_resources(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_info(&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 & PCI_RES_TYPE_MASK,
- rel_type);
- /* Restore size and flags */
- list_for_each_entry(fail_res, &fail_head, list) {
- struct resource *res = fail_res->res;
- int idx;
- res->start = fail_res->start;
- res->end = fail_res->end;
- res->flags = fail_res->flags;
- if (pci_is_bridge(fail_res->dev)) {
- idx = res - &fail_res->dev->resource[0];
- if (idx >= PCI_BRIDGE_RESOURCES &&
- idx <= PCI_BRIDGE_RESOURCE_END)
- 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);
- /* Make sure the root bridge has a companion ACPI device */
- if (ACPI_HANDLE(root_bus->bridge))
- acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
- }
- }
- void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
- {
- struct pci_bus *parent = bridge->subordinate;
- /* List of resources that want additional resources */
- LIST_HEAD(add_list);
- int tried_times = 0;
- LIST_HEAD(fail_head);
- struct pci_dev_resource *fail_res;
- int retval;
- again:
- __pci_bus_size_bridges(parent, &add_list);
- /*
- * Distribute remaining resources (if any) equally between hotplug
- * bridges below. This makes it possible to extend the hierarchy
- * later without running out of resources.
- */
- pci_bridge_distribute_available_resources(bridge, &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 aren't big enough
- * to contain child device resources.
- */
- list_for_each_entry(fail_res, &fail_head, list)
- pci_bus_release_bridge_resources(fail_res->dev->bus,
- fail_res->flags & PCI_RES_TYPE_MASK,
- whole_subtree);
- /* Restore size and flags */
- list_for_each_entry(fail_res, &fail_head, list) {
- struct resource *res = fail_res->res;
- int idx;
- res->start = fail_res->start;
- res->end = fail_res->end;
- res->flags = fail_res->flags;
- if (pci_is_bridge(fail_res->dev)) {
- idx = res - &fail_res->dev->resource[0];
- if (idx >= PCI_BRIDGE_RESOURCES &&
- idx <= PCI_BRIDGE_RESOURCE_END)
- res->flags = 0;
- }
- }
- free_list(&fail_head);
- goto again;
- enable_all:
- retval = pci_reenable_device(bridge);
- if (retval)
- pci_err(bridge, "Error reenabling bridge (%d)\n", retval);
- pci_set_master(bridge);
- }
- EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
- int pci_reassign_bridge_resources(struct pci_dev *bridge, unsigned long type)
- {
- struct pci_dev_resource *dev_res;
- struct pci_dev *next;
- LIST_HEAD(saved);
- LIST_HEAD(added);
- LIST_HEAD(failed);
- unsigned int i;
- int ret;
- down_read(&pci_bus_sem);
- /* Walk to the root hub, releasing bridge BARs when possible */
- next = bridge;
- do {
- bridge = next;
- for (i = PCI_BRIDGE_RESOURCES; i < PCI_BRIDGE_RESOURCE_END;
- i++) {
- struct resource *res = &bridge->resource[i];
- if ((res->flags ^ type) & PCI_RES_TYPE_MASK)
- continue;
- /* Ignore BARs which are still in use */
- if (res->child)
- continue;
- ret = add_to_list(&saved, bridge, res, 0, 0);
- if (ret)
- goto cleanup;
- pci_info(bridge, "BAR %d: releasing %pR\n",
- i, res);
- if (res->parent)
- release_resource(res);
- res->start = 0;
- res->end = 0;
- break;
- }
- if (i == PCI_BRIDGE_RESOURCE_END)
- break;
- next = bridge->bus ? bridge->bus->self : NULL;
- } while (next);
- if (list_empty(&saved)) {
- up_read(&pci_bus_sem);
- return -ENOENT;
- }
- __pci_bus_size_bridges(bridge->subordinate, &added);
- __pci_bridge_assign_resources(bridge, &added, &failed);
- BUG_ON(!list_empty(&added));
- if (!list_empty(&failed)) {
- ret = -ENOSPC;
- goto cleanup;
- }
- list_for_each_entry(dev_res, &saved, list) {
- /* Skip the bridge we just assigned resources for */
- if (bridge == dev_res->dev)
- continue;
- bridge = dev_res->dev;
- pci_setup_bridge(bridge->subordinate);
- }
- free_list(&saved);
- up_read(&pci_bus_sem);
- return 0;
- cleanup:
- /* Restore size and flags */
- list_for_each_entry(dev_res, &failed, list) {
- struct resource *res = dev_res->res;
- res->start = dev_res->start;
- res->end = dev_res->end;
- res->flags = dev_res->flags;
- }
- free_list(&failed);
- /* Revert to the old configuration */
- list_for_each_entry(dev_res, &saved, list) {
- struct resource *res = dev_res->res;
- bridge = dev_res->dev;
- i = res - bridge->resource;
- res->start = dev_res->start;
- res->end = dev_res->end;
- res->flags = dev_res->flags;
- pci_claim_resource(bridge, i);
- pci_setup_bridge(bridge->subordinate);
- }
- free_list(&saved);
- up_read(&pci_bus_sem);
- return ret;
- }
- void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
- {
- struct pci_dev *dev;
- /* List of resources that want additional resources */
- LIST_HEAD(add_list);
- down_read(&pci_bus_sem);
- for_each_pci_bridge(dev, bus)
- if (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));
- }
- EXPORT_SYMBOL_GPL(pci_assign_unassigned_bus_resources);
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