| /* |
| * 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 <ink@jurassic.park.msu.ru> |
| * PCI-PCI bridges cleanup, sorted resource allocation. |
| * Feb 2002, Ivan Kokshaysky <ink@jurassic.park.msu.ru> |
| * 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 "pci.h" |
| |
| 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); |
| } |
| } |
| |
| int pci_realloc_enable = 0; |
| #define pci_realloc_enabled() pci_realloc_enable |
| void pci_realloc(void) |
| { |
| pci_realloc_enable = 1; |
| } |
| |
| /** |
| * 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_warning("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 resource_size_t get_res_add_size(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 get_res_add_size add_size %llx\n", |
| idx, dev_res->res, |
| (unsigned long long)dev_res->add_size); |
| |
| return dev_res->add_size; |
| } |
| } |
| |
| return 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; |
| 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; |
| if (!resource_size(res)) { |
| res->start = add_res->start; |
| res->end = res->start + add_size - 1; |
| if (pci_assign_resource(add_res->dev, idx)) |
| reset_resource(res); |
| } else { |
| resource_size_t align = add_res->min_align; |
| 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 |
| * @failed_list : 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 && !pci_is_root_bus(dev_res->dev->bus)) { |
| /* |
| * 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 /* dont care */, |
| 0 /* dont care */); |
| } |
| reset_resource(res); |
| } |
| } |
| } |
| |
| 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 begining |
| * 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. |
| */ |
| LIST_HEAD(save_head); |
| LIST_HEAD(local_fail_head); |
| struct pci_dev_resource *save_res; |
| struct pci_dev_resource *dev_res; |
| |
| /* 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(dev_res, head, list) |
| dev_res->res->end += get_res_add_size(realloc_head, |
| dev_res->res); |
| |
| /* 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; |
| } |
| |
| 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 [bus %02x-%02x]\n", |
| bus->secondary, bus->subordinate); |
| |
| res = bus->resource[0]; |
| pcibios_resource_to_bus(bridge, ®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, ®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, ®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, ®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_bus *bus) |
| { |
| struct pci_dev *bridge = bus->self; |
| struct resource *res; |
| struct pci_bus_region region; |
| u32 l, io_upper16; |
| |
| /* Set up the top and bottom of the PCI I/O segment for this bus. */ |
| res = bus->resource[0]; |
| pcibios_resource_to_bus(bridge, ®ion, res); |
| if (res->flags & IORESOURCE_IO) { |
| pci_read_config_dword(bridge, PCI_IO_BASE, &l); |
| l &= 0xffff0000; |
| l |= (region.start >> 8) & 0x00f0; |
| l |= region.end & 0xf000; |
| /* 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_dword(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_bus *bus) |
| { |
| struct pci_dev *bridge = bus->self; |
| 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 = bus->resource[1]; |
| pcibios_resource_to_bus(bridge, ®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_bus *bus) |
| { |
| struct pci_dev *bridge = bus->self; |
| 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 = bus->resource[2]; |
| pcibios_resource_to_bus(bridge, ®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 [bus %02x-%02x]\n", |
| bus->secondary, bus->subordinate); |
| |
| if (type & IORESOURCE_IO) |
| pci_setup_bridge_io(bus); |
| |
| if (type & IORESOURCE_MEM) |
| pci_setup_bridge_mmio(bus); |
| |
| if (type & IORESOURCE_PREFETCH) |
| pci_setup_bridge_mmio_pref(bus); |
| |
| 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); |
| } |
| |
| /* 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, 0xf0f0); |
| 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, |
| 0xfff0fff0); |
| 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) |
| { |
| int i; |
| struct resource *r; |
| unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | |
| IORESOURCE_PREFETCH; |
| |
| 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; |
| } |
| |
| /** |
| * 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 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); |
| unsigned long size = 0, size0 = 0, size1 = 0; |
| resource_size_t children_add_size = 0; |
| |
| if (!b_res) |
| return; |
| |
| 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; |
| |
| if (realloc_head) |
| children_add_size += get_res_add_size(realloc_head, r); |
| } |
| } |
| size0 = calculate_iosize(size, min_size, size1, |
| resource_size(b_res), 4096); |
| 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), 4096); |
| if (!size0 && !size1) { |
| if (b_res->start || b_res->end) |
| dev_info(&bus->self->dev, "disabling bridge window " |
| "%pR to [bus %02x-%02x] (unused)\n", b_res, |
| bus->secondary, bus->subordinate); |
| b_res->flags = 0; |
| return; |
| } |
| /* Alignment of the IO window is always 4K */ |
| b_res->start = 4096; |
| 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, 4096); |
| dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window " |
| "%pR to [bus %02x-%02x] add_size %lx\n", b_res, |
| bus->secondary, bus->subordinate, size1-size0); |
| } |
| } |
| |
| /** |
| * pbus_size_mem() - size the memory window of a given bus |
| * |
| * @bus : the bus |
| * @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. |
| */ |
| static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, |
| unsigned long type, 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[12]; /* Alignments from 1Mb to 2Gb */ |
| int order, max_order; |
| struct resource *b_res = find_free_bus_resource(bus, type); |
| unsigned int mem64_mask = 0; |
| resource_size_t children_add_size = 0; |
| |
| if (!b_res) |
| return 0; |
| |
| memset(aligns, 0, sizeof(aligns)); |
| max_order = 0; |
| size = 0; |
| |
| mem64_mask = b_res->flags & IORESOURCE_MEM_64; |
| b_res->flags &= ~IORESOURCE_MEM_64; |
| |
| 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) |
| 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) { |
| r->end = r->start - 1; |
| add_to_list(realloc_head, dev, r, r_size, 0/* dont' care */); |
| children_add_size += r_size; |
| continue; |
| } |
| #endif |
| /* For bridges size != alignment */ |
| align = pci_resource_alignment(dev, r); |
| order = __ffs(align) - 20; |
| if (order > 11) { |
| 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; |
| if (order < 0) |
| order = 0; |
| /* Exclude ranges with size > align from |
| calculation of the alignment. */ |
| if (r_size == align) |
| aligns[order] += align; |
| if (order > max_order) |
| max_order = order; |
| mem64_mask &= r->flags & IORESOURCE_MEM_64; |
| |
| if (realloc_head) |
| children_add_size += get_res_add_size(realloc_head, r); |
| } |
| } |
| align = 0; |
| min_align = 0; |
| 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]; |
| } |
| size0 = calculate_memsize(size, min_size, 0, 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_memsize(size, min_size, add_size, |
| 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 [bus %02x-%02x] (unused)\n", b_res, |
| bus->secondary, bus->subordinate); |
| b_res->flags = 0; |
| return 1; |
| } |
| b_res->start = min_align; |
| b_res->end = size0 + min_align - 1; |
| b_res->flags |= IORESOURCE_STARTALIGN | mem64_mask; |
| 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 [bus %02x-%02x] add_size %llx\n", b_res, |
| bus->secondary, bus->subordinate, (unsigned long long)size1-size0); |
| } |
| return 1; |
| } |
| |
| 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 __ref __pci_bus_size_bridges(struct pci_bus *bus, |
| struct list_head *realloc_head) |
| { |
| struct pci_dev *dev; |
| unsigned long mask, prefmask; |
| resource_size_t additional_mem_size = 0, additional_io_size = 0; |
| |
| 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 (!bus->self) |
| 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; |
| } |
| /* |
| * Follow thru |
| */ |
| default: |
| pbus_size_io(bus, realloc_head ? 0 : additional_io_size, |
| additional_io_size, realloc_head); |
| /* If the bridge supports prefetchable range, size it |
| separately. If it doesn't, or its prefetchable window |
| has already been allocated by arch code, try |
| non-prefetchable range for both types of PCI memory |
| resources. */ |
| mask = IORESOURCE_MEM; |
| prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH; |
| if (pbus_size_mem(bus, prefmask, prefmask, |
| realloc_head ? 0 : additional_mem_size, |
| additional_mem_size, realloc_head)) |
| mask = prefmask; /* Success, size non-prefetch only. */ |
| else |
| additional_mem_size += additional_mem_size; |
| pbus_size_mem(bus, mask, IORESOURCE_MEM, |
| realloc_head ? 0 : additional_mem_size, |
| additional_mem_size, realloc_head); |
| break; |
| } |
| } |
| |
| void __ref pci_bus_size_bridges(struct pci_bus *bus) |
| { |
| __pci_bus_size_bridges(bus, NULL); |
| } |
| EXPORT_SYMBOL(pci_bus_size_bridges); |
| |
| static void __ref __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 __ref pci_bus_assign_resources(const struct pci_bus *bus) |
| { |
| __pci_bus_assign_resources(bus, NULL, NULL); |
| } |
| EXPORT_SYMBOL(pci_bus_assign_resources); |
| |
| static void __ref __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) |
| { |
| int idx; |
| bool changed = false; |
| struct pci_dev *dev; |
| struct resource *r; |
| unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | |
| IORESOURCE_PREFETCH; |
| |
| dev = bus->self; |
| for (idx = PCI_BRIDGE_RESOURCES; idx <= PCI_BRIDGE_RESOURCE_END; |
| idx++) { |
| r = &dev->resource[idx]; |
| if ((r->flags & type_mask) != type) |
| continue; |
| if (!r->parent) |
| continue; |
| /* |
| * if there are children under that, we should release them |
| * all |
| */ |
| release_child_resources(r); |
| if (!release_resource(r)) { |
| dev_printk(KERN_DEBUG, &dev->dev, |
| "resource %d %pR released\n", idx, r); |
| /* keep the old size */ |
| r->end = resource_size(r) - 1; |
| r->start = 0; |
| r->flags = 0; |
| changed = true; |
| } |
| } |
| |
| if (changed) { |
| /* avoiding touch the one without PREF */ |
| if (type & IORESOURCE_PREFETCH) |
| type = IORESOURCE_PREFETCH; |
| __pci_setup_bridge(bus, type); |
| } |
| } |
| |
| 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 __ref 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 __init pci_bus_get_depth(struct pci_bus *bus) |
| { |
| int depth = 0; |
| struct pci_dev *dev; |
| |
| list_for_each_entry(dev, &bus->devices, bus_list) { |
| int ret; |
| struct pci_bus *b = dev->subordinate; |
| if (!b) |
| continue; |
| |
| ret = pci_bus_get_depth(b); |
| if (ret + 1 > depth) |
| depth = ret + 1; |
| } |
| |
| return depth; |
| } |
| static int __init pci_get_max_depth(void) |
| { |
| int depth = 0; |
| struct pci_bus *bus; |
| |
| list_for_each_entry(bus, &pci_root_buses, node) { |
| int ret; |
| |
| ret = pci_bus_get_depth(bus); |
| if (ret > depth) |
| depth = ret; |
| } |
| |
| return depth; |
| } |
| |
| |
| /* |
| * first try will not touch pci bridge res |
| * second and later try will clear small leaf bridge res |
| * will stop till to the max deepth if can not find good one |
| */ |
| void __init |
| pci_assign_unassigned_resources(void) |
| { |
| 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; |
| unsigned long failed_type; |
| int pci_try_num = 1; |
| |
| /* don't realloc if asked to do so */ |
| if (pci_realloc_enabled()) { |
| int max_depth = pci_get_max_depth(); |
| |
| pci_try_num = max_depth + 1; |
| printk(KERN_DEBUG "PCI: 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. */ |
| list_for_each_entry(bus, &pci_root_buses, node) |
| __pci_bus_size_bridges(bus, add_list); |
| |
| /* Depth last, allocate resources and update the hardware. */ |
| list_for_each_entry(bus, &pci_root_buses, node) |
| __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 enable_and_dump; |
| |
| failed_type = 0; |
| list_for_each_entry(fail_res, &fail_head, list) |
| failed_type |= fail_res->flags; |
| |
| /* |
| * io port are tight, don't try extra |
| * or if reach the limit, don't want to try more |
| */ |
| failed_type &= type_mask; |
| if ((failed_type == IORESOURCE_IO) || (tried_times >= pci_try_num)) { |
| free_list(&fail_head); |
| goto enable_and_dump; |
| } |
| |
| printk(KERN_DEBUG "PCI: 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) { |
| bus = fail_res->dev->bus; |
| pci_bus_release_bridge_resources(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; |
| |
| enable_and_dump: |
| /* Depth last, update the hardware. */ |
| list_for_each_entry(bus, &pci_root_buses, node) |
| pci_enable_bridges(bus); |
| |
| /* dump the resource on buses */ |
| list_for_each_entry(bus, &pci_root_buses, node) |
| pci_bus_dump_resources(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; |
| |
| 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) { |
| struct pci_bus *bus = fail_res->dev->bus; |
| unsigned long flags = fail_res->flags; |
| |
| pci_bus_release_bridge_resources(bus, 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); |
| pci_set_master(bridge); |
| pci_enable_bridges(parent); |
| } |
| EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources); |
| |
| #ifdef CONFIG_HOTPLUG |
| /** |
| * pci_rescan_bus - scan a PCI bus for devices. |
| * @bus: PCI bus to scan |
| * |
| * Scan a PCI bus and child buses for new devices, adds them, |
| * and enables them. |
| * |
| * Returns the max number of subordinate bus discovered. |
| */ |
| unsigned int __ref pci_rescan_bus(struct pci_bus *bus) |
| { |
| unsigned int max; |
| struct pci_dev *dev; |
| LIST_HEAD(add_list); /* list of resources that |
| want additional resources */ |
| |
| max = pci_scan_child_bus(bus); |
| |
| down_read(&pci_bus_sem); |
| list_for_each_entry(dev, &bus->devices, bus_list) |
| if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || |
| dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) |
| if (dev->subordinate) |
| __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)); |
| |
| pci_enable_bridges(bus); |
| pci_bus_add_devices(bus); |
| |
| return max; |
| } |
| EXPORT_SYMBOL_GPL(pci_rescan_bus); |
| #endif |