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![Gustavo A. R. Silva](/assets/img/avatar_default.png)
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2242 lines
59 KiB
C
2242 lines
59 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Support routines for initializing a PCI subsystem
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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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* 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 <linux/acpi.h>
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#include "pci.h"
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unsigned int pci_flags;
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EXPORT_SYMBOL_GPL(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 to which the resource belongs
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* @res: Resource to be tracked
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* @add_size: Additional size to be optionally added to the resource
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* @min_align: Minimum memory window alignment
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*/
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static int add_to_list(struct list_head *head, struct pci_dev *dev,
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struct resource *res, resource_size_t add_size,
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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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return -ENOMEM;
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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, 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 struct pci_dev_resource *res_to_dev_res(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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return dev_res;
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}
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return NULL;
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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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dev_res = res_to_dev_res(head, res);
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return dev_res ? dev_res->add_size : 0;
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}
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static resource_size_t get_res_add_align(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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dev_res = res_to_dev_res(head, res);
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return dev_res ? dev_res->min_align : 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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pci_warn(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("%s: kzalloc() failed!\n", __func__);
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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, 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
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* additional 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 additional
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* resources for the element, provided the element 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, align;
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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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align = add_res->min_align;
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if (!resource_size(res)) {
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res->start = align;
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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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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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pci_info(add_res->dev, "failed to add %llx res[%d]=%pR\n",
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(unsigned long long) add_size, idx,
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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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* @fail_head: Head of the list tracking requests that could not be
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* allocated
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*
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* Satisfy resource requests of each element in the list. Add requests that
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* could not be 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) {
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/*
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* If the failed resource is a ROM BAR and
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* it will be enabled later, don't add it
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* 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 /* don't care */,
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0 /* don't 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 unsigned long pci_fail_res_type_mask(struct list_head *fail_head)
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{
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struct pci_dev_resource *fail_res;
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unsigned long mask = 0;
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/* Check failed type */
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list_for_each_entry(fail_res, fail_head, list)
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mask |= fail_res->flags;
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/*
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* One pref failed resource will set IORESOURCE_MEM, as we can
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* allocate pref in non-pref range. Will release all assigned
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* non-pref sibling resources according to that bit.
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*/
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return mask & (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH);
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}
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static bool pci_need_to_release(unsigned long mask, struct resource *res)
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{
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if (res->flags & IORESOURCE_IO)
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return !!(mask & IORESOURCE_IO);
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/* Check pref at first */
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if (res->flags & IORESOURCE_PREFETCH) {
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if (mask & IORESOURCE_PREFETCH)
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return true;
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/* Count pref if its parent is non-pref */
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else if ((mask & IORESOURCE_MEM) &&
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!(res->parent->flags & IORESOURCE_PREFETCH))
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return true;
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else
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return false;
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}
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if (res->flags & IORESOURCE_MEM)
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return !!(mask & IORESOURCE_MEM);
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return false; /* Should not get here */
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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. They could be
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* adjacent, so later reassign can not reallocate them one by one in
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* parent resource window.
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*
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* Try to assign requested + add_size at beginning. If could do that,
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* could get out early. If could not do that, we still try to assign
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* requested at first, then try to reassign add_size for some resources.
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*
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* Separate three resource type checking if we need to release
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* assigned resource after requested + add_size try.
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*
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* 1. If IO port assignment fails, will release assigned IO
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* port.
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* 2. If pref MMIO assignment fails, release assigned pref
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* MMIO. If assigned pref MMIO's parent is non-pref MMIO
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* and non-pref MMIO assignment fails, will release that
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* assigned pref MMIO.
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* 3. If non-pref MMIO assignment fails or pref MMIO
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* assignment fails, will release assigned non-pref MMIO.
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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, *tmp_res, *dev_res2;
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unsigned long fail_type;
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resource_size_t add_align, align;
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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_safe(dev_res, tmp_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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/*
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* There are two kinds of additional resources in the list:
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* 1. bridge resource -- IORESOURCE_STARTALIGN
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* 2. SR-IOV resource -- IORESOURCE_SIZEALIGN
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* Here just fix the additional alignment for bridge
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*/
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if (!(dev_res->res->flags & IORESOURCE_STARTALIGN))
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continue;
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add_align = get_res_add_align(realloc_head, dev_res->res);
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/*
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* The "head" list is sorted by alignment so resources with
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* bigger alignment will be assigned first. After we
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* change the alignment of a dev_res in "head" list, we
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* need to reorder the list by alignment to make it
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* consistent.
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*/
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if (add_align > dev_res->res->start) {
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resource_size_t r_size = resource_size(dev_res->res);
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dev_res->res->start = add_align;
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dev_res->res->end = add_align + r_size - 1;
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list_for_each_entry(dev_res2, head, list) {
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align = pci_resource_alignment(dev_res2->dev,
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dev_res2->res);
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if (add_align > align) {
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list_move_tail(&dev_res->list,
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&dev_res2->list);
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break;
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}
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}
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}
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|
|
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}
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|
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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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|
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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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/* Check failed type */
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fail_type = pci_fail_res_type_mask(&local_fail_head);
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/* Remove not need to be released assigned res from head list etc */
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list_for_each_entry_safe(dev_res, tmp_res, head, list)
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if (dev_res->res->parent &&
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!pci_need_to_release(fail_type, dev_res->res)) {
|
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/* Remove it from realloc_head list */
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remove_from_list(realloc_head, dev_res->res);
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remove_from_list(&save_head, dev_res->res);
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list_del(&dev_res->list);
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kfree(dev_res);
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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);
|
|
/* 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;
|
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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);
|
|
|
|
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,
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|
struct list_head *add_head,
|
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struct list_head *fail_head)
|
|
{
|
|
LIST_HEAD(head);
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|
|
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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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}
|
|
|
|
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);
|
|
}
|
|
|
|
res->end = res->start + new_size - 1;
|
|
remove_from_list(add_list, res);
|
|
}
|
|
|
|
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_hp, mmio_per_hp, mmio_pref_per_hp, 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++;
|
|
}
|
|
|
|
/*
|
|
* There is only one bridge on the bus so it gets all available
|
|
* resources which it can then distribute to the possible hotplug
|
|
* bridges below.
|
|
*/
|
|
if (hotplug_bridges + normal_bridges == 1) {
|
|
dev = list_first_entry(&bus->devices, struct pci_dev, bus_list);
|
|
if (dev->subordinate)
|
|
pci_bus_distribute_available_resources(dev->subordinate,
|
|
add_list, io, mmio, mmio_pref);
|
|
return;
|
|
}
|
|
|
|
if (hotplug_bridges == 0)
|
|
return;
|
|
|
|
/*
|
|
* Calculate the total amount of extra resource space we can
|
|
* pass to bridges below this one. This is basically the
|
|
* extra space reduced by the minimal required space for the
|
|
* non-hotplug bridges.
|
|
*/
|
|
for_each_pci_bridge(dev, bus) {
|
|
resource_size_t used_size;
|
|
struct resource *res;
|
|
|
|
if (dev->is_hotplug_bridge)
|
|
continue;
|
|
|
|
/*
|
|
* Reduce the available resource space by what the
|
|
* bridge and devices below it occupy.
|
|
*/
|
|
res = &dev->resource[PCI_BRIDGE_IO_WINDOW];
|
|
align = pci_resource_alignment(dev, res);
|
|
align = align ? ALIGN(io.start, align) - io.start : 0;
|
|
used_size = align + resource_size(res);
|
|
if (!res->parent)
|
|
io.start = min(io.start + used_size, io.end + 1);
|
|
|
|
res = &dev->resource[PCI_BRIDGE_MEM_WINDOW];
|
|
align = pci_resource_alignment(dev, res);
|
|
align = align ? ALIGN(mmio.start, align) - mmio.start : 0;
|
|
used_size = align + resource_size(res);
|
|
if (!res->parent)
|
|
mmio.start = min(mmio.start + used_size, mmio.end + 1);
|
|
|
|
res = &dev->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
|
|
align = pci_resource_alignment(dev, res);
|
|
align = align ? ALIGN(mmio_pref.start, align) -
|
|
mmio_pref.start : 0;
|
|
used_size = align + resource_size(res);
|
|
if (!res->parent)
|
|
mmio_pref.start = min(mmio_pref.start + used_size,
|
|
mmio_pref.end + 1);
|
|
}
|
|
|
|
io_per_hp = div64_ul(resource_size(&io), hotplug_bridges);
|
|
mmio_per_hp = div64_ul(resource_size(&mmio), hotplug_bridges);
|
|
mmio_pref_per_hp = div64_ul(resource_size(&mmio_pref),
|
|
hotplug_bridges);
|
|
|
|
/*
|
|
* Go over devices on this bus and distribute the remaining
|
|
* resource space between hotplug bridges.
|
|
*/
|
|
for_each_pci_bridge(dev, bus) {
|
|
struct pci_bus *b;
|
|
|
|
b = dev->subordinate;
|
|
if (!b || !dev->is_hotplug_bridge)
|
|
continue;
|
|
|
|
/*
|
|
* Distribute available extra resources equally between
|
|
* hotplug-capable downstream ports taking alignment into
|
|
* account.
|
|
*/
|
|
io.end = io.start + io_per_hp - 1;
|
|
mmio.end = mmio.start + mmio_per_hp - 1;
|
|
mmio_pref.end = mmio_pref.start + mmio_pref_per_hp - 1;
|
|
|
|
pci_bus_distribute_available_resources(b, add_list, io, mmio,
|
|
mmio_pref);
|
|
|
|
io.start += io_per_hp;
|
|
mmio.start += mmio_per_hp;
|
|
mmio_pref.start += mmio_pref_per_hp;
|
|
}
|
|
}
|
|
|
|
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);
|