diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/pci/setup-bus.c | 2291 |
1 files changed, 2291 insertions, 0 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c new file mode 100644 index 000000000..16d291e10 --- /dev/null +++ b/drivers/pci/setup-bus.c @@ -0,0 +1,2291 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Support routines for initializing a PCI subsystem + * + * Extruded from code written by + * Dave Rusling (david.rusling@reo.mts.dec.com) + * David Mosberger (davidm@cs.arizona.edu) + * David Miller (davem@redhat.com) + * + * 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 <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[18]; /* Alignments from 1MB to 128GB */ + 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 old_flags = 0; + 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 + +/* + * 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); + + /* 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)); + } +} + +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; + 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; + + /* 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); +} + +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); |