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1527 lines
40 KiB
C
1527 lines
40 KiB
C
/*
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* drivers/pci/setup-bus.c
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*
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* Extruded from code written by
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* Dave Rusling (david.rusling@reo.mts.dec.com)
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* David Mosberger (davidm@cs.arizona.edu)
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* David Miller (davem@redhat.com)
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*
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* Support routines for initializing a PCI subsystem.
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*/
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/*
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* Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
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* PCI-PCI bridges cleanup, sorted resource allocation.
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* Feb 2002, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
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* Converted to allocation in 3 passes, which gives
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* tighter packing. Prefetchable range support.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/cache.h>
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#include <linux/slab.h>
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#include <asm-generic/pci-bridge.h>
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#include "pci.h"
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unsigned int pci_flags;
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struct pci_dev_resource {
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struct list_head list;
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struct resource *res;
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struct pci_dev *dev;
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resource_size_t start;
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resource_size_t end;
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resource_size_t add_size;
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resource_size_t min_align;
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unsigned long flags;
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};
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static void free_list(struct list_head *head)
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{
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struct pci_dev_resource *dev_res, *tmp;
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list_for_each_entry_safe(dev_res, tmp, head, list) {
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list_del(&dev_res->list);
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kfree(dev_res);
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}
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}
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/**
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* add_to_list() - add a new resource tracker to the list
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* @head: Head of the list
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* @dev: device corresponding to which the resource
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* belongs
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* @res: The resource to be tracked
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* @add_size: additional size to be optionally added
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* to the resource
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*/
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static int add_to_list(struct list_head *head,
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struct pci_dev *dev, struct resource *res,
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resource_size_t add_size, resource_size_t min_align)
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{
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struct pci_dev_resource *tmp;
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tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
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if (!tmp) {
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pr_warning("add_to_list: kmalloc() failed!\n");
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return -ENOMEM;
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}
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tmp->res = res;
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tmp->dev = dev;
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tmp->start = res->start;
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tmp->end = res->end;
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tmp->flags = res->flags;
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tmp->add_size = add_size;
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tmp->min_align = min_align;
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list_add(&tmp->list, head);
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return 0;
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}
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static void remove_from_list(struct list_head *head,
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struct resource *res)
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{
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struct pci_dev_resource *dev_res, *tmp;
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list_for_each_entry_safe(dev_res, tmp, head, list) {
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if (dev_res->res == res) {
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list_del(&dev_res->list);
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kfree(dev_res);
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break;
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}
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}
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}
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static resource_size_t get_res_add_size(struct list_head *head,
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struct resource *res)
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{
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struct pci_dev_resource *dev_res;
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list_for_each_entry(dev_res, head, list) {
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if (dev_res->res == res) {
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int idx = res - &dev_res->dev->resource[0];
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dev_printk(KERN_DEBUG, &dev_res->dev->dev,
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"res[%d]=%pR get_res_add_size add_size %llx\n",
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idx, dev_res->res,
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(unsigned long long)dev_res->add_size);
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return dev_res->add_size;
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}
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}
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return 0;
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}
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/* Sort resources by alignment */
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static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
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{
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int i;
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for (i = 0; i < PCI_NUM_RESOURCES; i++) {
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struct resource *r;
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struct pci_dev_resource *dev_res, *tmp;
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resource_size_t r_align;
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struct list_head *n;
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r = &dev->resource[i];
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if (r->flags & IORESOURCE_PCI_FIXED)
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continue;
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if (!(r->flags) || r->parent)
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continue;
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r_align = pci_resource_alignment(dev, r);
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if (!r_align) {
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dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n",
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i, r);
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continue;
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}
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tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
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if (!tmp)
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panic("pdev_sort_resources(): "
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"kmalloc() failed!\n");
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tmp->res = r;
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tmp->dev = dev;
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/* fallback is smallest one or list is empty*/
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n = head;
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list_for_each_entry(dev_res, head, list) {
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resource_size_t align;
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align = pci_resource_alignment(dev_res->dev,
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dev_res->res);
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if (r_align > align) {
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n = &dev_res->list;
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break;
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}
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}
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/* Insert it just before n*/
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list_add_tail(&tmp->list, n);
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}
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}
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static void __dev_sort_resources(struct pci_dev *dev,
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struct list_head *head)
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{
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u16 class = dev->class >> 8;
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/* Don't touch classless devices or host bridges or ioapics. */
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if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST)
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return;
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/* Don't touch ioapic devices already enabled by firmware */
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if (class == PCI_CLASS_SYSTEM_PIC) {
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u16 command;
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pci_read_config_word(dev, PCI_COMMAND, &command);
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if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
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return;
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}
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pdev_sort_resources(dev, head);
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}
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static inline void reset_resource(struct resource *res)
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{
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res->start = 0;
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res->end = 0;
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res->flags = 0;
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}
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/**
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* reassign_resources_sorted() - satisfy any additional resource requests
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*
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* @realloc_head : head of the list tracking requests requiring additional
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* resources
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* @head : head of the list tracking requests with allocated
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* resources
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*
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* Walk through each element of the realloc_head and try to procure
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* additional resources for the element, provided the element
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* is in the head list.
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*/
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static void reassign_resources_sorted(struct list_head *realloc_head,
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struct list_head *head)
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{
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struct resource *res;
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struct pci_dev_resource *add_res, *tmp;
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struct pci_dev_resource *dev_res;
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resource_size_t add_size;
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int idx;
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list_for_each_entry_safe(add_res, tmp, realloc_head, list) {
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bool found_match = false;
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res = add_res->res;
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/* skip resource that has been reset */
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if (!res->flags)
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goto out;
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/* skip this resource if not found in head list */
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list_for_each_entry(dev_res, head, list) {
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if (dev_res->res == res) {
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found_match = true;
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break;
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}
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}
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if (!found_match)/* just skip */
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continue;
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idx = res - &add_res->dev->resource[0];
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add_size = add_res->add_size;
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if (!resource_size(res)) {
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res->start = add_res->start;
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res->end = res->start + add_size - 1;
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if (pci_assign_resource(add_res->dev, idx))
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reset_resource(res);
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} else {
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resource_size_t align = add_res->min_align;
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res->flags |= add_res->flags &
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(IORESOURCE_STARTALIGN|IORESOURCE_SIZEALIGN);
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if (pci_reassign_resource(add_res->dev, idx,
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add_size, align))
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dev_printk(KERN_DEBUG, &add_res->dev->dev,
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"failed to add %llx res[%d]=%pR\n",
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(unsigned long long)add_size,
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idx, res);
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}
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out:
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list_del(&add_res->list);
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kfree(add_res);
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}
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}
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/**
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* assign_requested_resources_sorted() - satisfy resource requests
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*
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* @head : head of the list tracking requests for resources
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* @failed_list : head of the list tracking requests that could
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* not be allocated
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*
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* Satisfy resource requests of each element in the list. Add
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* requests that could not satisfied to the failed_list.
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*/
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static void assign_requested_resources_sorted(struct list_head *head,
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struct list_head *fail_head)
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{
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struct resource *res;
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struct pci_dev_resource *dev_res;
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int idx;
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list_for_each_entry(dev_res, head, list) {
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res = dev_res->res;
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idx = res - &dev_res->dev->resource[0];
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if (resource_size(res) &&
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pci_assign_resource(dev_res->dev, idx)) {
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if (fail_head && !pci_is_root_bus(dev_res->dev->bus)) {
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/*
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* if the failed res is for ROM BAR, and it will
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* be enabled later, don't add it to the list
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*/
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if (!((idx == PCI_ROM_RESOURCE) &&
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(!(res->flags & IORESOURCE_ROM_ENABLE))))
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add_to_list(fail_head,
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dev_res->dev, res,
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0 /* dont care */,
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0 /* dont care */);
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}
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reset_resource(res);
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}
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}
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}
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static void __assign_resources_sorted(struct list_head *head,
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struct list_head *realloc_head,
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struct list_head *fail_head)
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{
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/*
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* Should not assign requested resources at first.
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* they could be adjacent, so later reassign can not reallocate
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* them one by one in parent resource window.
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* Try to assign requested + add_size at begining
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* if could do that, could get out early.
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* if could not do that, we still try to assign requested at first,
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* then try to reassign add_size for some resources.
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*/
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LIST_HEAD(save_head);
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LIST_HEAD(local_fail_head);
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struct pci_dev_resource *save_res;
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struct pci_dev_resource *dev_res;
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/* Check if optional add_size is there */
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if (!realloc_head || list_empty(realloc_head))
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goto requested_and_reassign;
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/* Save original start, end, flags etc at first */
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list_for_each_entry(dev_res, head, list) {
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if (add_to_list(&save_head, dev_res->dev, dev_res->res, 0, 0)) {
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free_list(&save_head);
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goto requested_and_reassign;
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}
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}
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/* Update res in head list with add_size in realloc_head list */
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list_for_each_entry(dev_res, head, list)
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dev_res->res->end += get_res_add_size(realloc_head,
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dev_res->res);
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/* Try updated head list with add_size added */
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assign_requested_resources_sorted(head, &local_fail_head);
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/* all assigned with add_size ? */
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if (list_empty(&local_fail_head)) {
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/* Remove head list from realloc_head list */
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list_for_each_entry(dev_res, head, list)
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remove_from_list(realloc_head, dev_res->res);
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free_list(&save_head);
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free_list(head);
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return;
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}
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free_list(&local_fail_head);
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/* Release assigned resource */
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list_for_each_entry(dev_res, head, list)
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if (dev_res->res->parent)
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release_resource(dev_res->res);
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/* Restore start/end/flags from saved list */
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list_for_each_entry(save_res, &save_head, list) {
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struct resource *res = save_res->res;
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res->start = save_res->start;
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res->end = save_res->end;
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res->flags = save_res->flags;
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}
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free_list(&save_head);
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requested_and_reassign:
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/* Satisfy the must-have resource requests */
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assign_requested_resources_sorted(head, fail_head);
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/* Try to satisfy any additional optional resource
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requests */
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if (realloc_head)
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reassign_resources_sorted(realloc_head, head);
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free_list(head);
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}
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static void pdev_assign_resources_sorted(struct pci_dev *dev,
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struct list_head *add_head,
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struct list_head *fail_head)
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{
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LIST_HEAD(head);
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__dev_sort_resources(dev, &head);
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__assign_resources_sorted(&head, add_head, fail_head);
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}
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static void pbus_assign_resources_sorted(const struct pci_bus *bus,
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struct list_head *realloc_head,
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struct list_head *fail_head)
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{
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struct pci_dev *dev;
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LIST_HEAD(head);
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list_for_each_entry(dev, &bus->devices, bus_list)
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__dev_sort_resources(dev, &head);
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__assign_resources_sorted(&head, realloc_head, fail_head);
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}
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void pci_setup_cardbus(struct pci_bus *bus)
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{
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struct pci_dev *bridge = bus->self;
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struct resource *res;
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struct pci_bus_region region;
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dev_info(&bridge->dev, "CardBus bridge to [bus %02x-%02x]\n",
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bus->secondary, bus->subordinate);
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res = bus->resource[0];
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pcibios_resource_to_bus(bridge, ®ion, res);
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if (res->flags & IORESOURCE_IO) {
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/*
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* The IO resource is allocated a range twice as large as it
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* would normally need. This allows us to set both IO regs.
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*/
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dev_info(&bridge->dev, " bridge window %pR\n", res);
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pci_write_config_dword(bridge, PCI_CB_IO_BASE_0,
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region.start);
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pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0,
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region.end);
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}
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res = bus->resource[1];
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pcibios_resource_to_bus(bridge, ®ion, res);
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if (res->flags & IORESOURCE_IO) {
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dev_info(&bridge->dev, " bridge window %pR\n", res);
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pci_write_config_dword(bridge, PCI_CB_IO_BASE_1,
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region.start);
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pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1,
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region.end);
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}
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res = bus->resource[2];
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pcibios_resource_to_bus(bridge, ®ion, res);
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if (res->flags & IORESOURCE_MEM) {
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dev_info(&bridge->dev, " bridge window %pR\n", res);
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pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0,
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region.start);
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pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0,
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region.end);
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}
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res = bus->resource[3];
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pcibios_resource_to_bus(bridge, ®ion, res);
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if (res->flags & IORESOURCE_MEM) {
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dev_info(&bridge->dev, " bridge window %pR\n", res);
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pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1,
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region.start);
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pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1,
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region.end);
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}
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}
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EXPORT_SYMBOL(pci_setup_cardbus);
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|
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/* Initialize bridges with base/limit values we have collected.
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PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998)
|
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requires that if there is no I/O ports or memory behind the
|
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bridge, corresponding range must be turned off by writing base
|
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value greater than limit to the bridge's base/limit registers.
|
|
|
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Note: care must be taken when updating I/O base/limit registers
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of bridges which support 32-bit I/O. This update requires two
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config space writes, so it's quite possible that an I/O window of
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the bridge will have some undesirable address (e.g. 0) after the
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first write. Ditto 64-bit prefetchable MMIO. */
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static void pci_setup_bridge_io(struct pci_bus *bus)
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{
|
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struct pci_dev *bridge = bus->self;
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struct resource *res;
|
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struct pci_bus_region region;
|
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u32 l, io_upper16;
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|
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/* Set up the top and bottom of the PCI I/O segment for this bus. */
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res = bus->resource[0];
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pcibios_resource_to_bus(bridge, ®ion, res);
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if (res->flags & IORESOURCE_IO) {
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pci_read_config_dword(bridge, PCI_IO_BASE, &l);
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l &= 0xffff0000;
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l |= (region.start >> 8) & 0x00f0;
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l |= region.end & 0xf000;
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/* Set up upper 16 bits of I/O base/limit. */
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io_upper16 = (region.end & 0xffff0000) | (region.start >> 16);
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dev_info(&bridge->dev, " bridge window %pR\n", res);
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} else {
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/* Clear upper 16 bits of I/O base/limit. */
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io_upper16 = 0;
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l = 0x00f0;
|
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}
|
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/* Temporarily disable the I/O range before updating PCI_IO_BASE. */
|
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pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff);
|
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/* Update lower 16 bits of I/O base/limit. */
|
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pci_write_config_dword(bridge, PCI_IO_BASE, l);
|
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/* Update upper 16 bits of I/O base/limit. */
|
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pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16);
|
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}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* -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 __initdata = 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 __init pci_realloc_enabled(void)
|
|
{
|
|
return pci_realloc_enable >= user_enabled;
|
|
}
|
|
|
|
static void __init pci_realloc_detect(void)
|
|
{
|
|
#if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO)
|
|
struct pci_dev *dev = NULL;
|
|
|
|
if (pci_realloc_enable != undefined)
|
|
return;
|
|
|
|
for_each_pci_dev(dev) {
|
|
int i;
|
|
|
|
for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
|
|
struct resource *r = &dev->resource[i];
|
|
|
|
/* Not assigned, or rejected by kernel ? */
|
|
if (r->flags && !r->start) {
|
|
pci_realloc_enable = auto_enabled;
|
|
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
#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 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;
|
|
int pci_try_num = 1;
|
|
|
|
/* don't realloc if asked to do so */
|
|
pci_realloc_detect();
|
|
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;
|
|
|
|
if (tried_times >= pci_try_num) {
|
|
if (pci_realloc_enable == undefined)
|
|
printk(KERN_INFO "Some PCI device resources are unassigned, try booting with pci=realloc\n");
|
|
else if (pci_realloc_enable == auto_enabled)
|
|
printk(KERN_INFO "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n");
|
|
|
|
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)
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{
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unsigned int max;
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struct pci_dev *dev;
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LIST_HEAD(add_list); /* list of resources that
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want additional resources */
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max = pci_scan_child_bus(bus);
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down_read(&pci_bus_sem);
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list_for_each_entry(dev, &bus->devices, bus_list)
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if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
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dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
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if (dev->subordinate)
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__pci_bus_size_bridges(dev->subordinate,
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&add_list);
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up_read(&pci_bus_sem);
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__pci_bus_assign_resources(bus, &add_list, NULL);
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BUG_ON(!list_empty(&add_list));
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|
|
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pci_enable_bridges(bus);
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pci_bus_add_devices(bus);
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|
|
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return max;
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}
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EXPORT_SYMBOL_GPL(pci_rescan_bus);
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#endif
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