bus_numa.c

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#include <linux/init.h>
#include <linux/pci.h>
#include <linux/range.h>

#include "bus_numa.h"

LIST_HEAD(pci_root_infos);

static struct pci_root_info *x86_find_pci_root_info(int bus)
{
    struct pci_root_info *info;

    if (list_empty(&pci_root_infos))
        return NULL;

    list_for_each_entry(info, &pci_root_infos, list)
        if (info->busn.start == bus)
            return info;

    return NULL;
}

void x86_pci_root_bus_resources(int bus, struct list_head *resources)
{
    struct pci_root_info *info = x86_find_pci_root_info(bus);
    struct pci_root_res *root_res;
    struct pci_host_bridge_window *window;
    bool found = false;

    if (!info)
        goto default_resources;

    printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n",
           bus);

    /* already added by acpi ? */
    list_for_each_entry(window, resources, list)
        if (window->res->flags & IORESOURCE_BUS) {
            found = true;
            break;
        }

    if (!found)
        pci_add_resource(resources, &info->busn);

    list_for_each_entry(root_res, &info->resources, list) {
        struct resource *res;
        struct resource *root;

        res = &root_res->res;
        pci_add_resource(resources, res);
        if (res->flags & IORESOURCE_IO)
            root = &ioport_resource;
        else
            root = &iomem_resource;
        insert_resource(root, res);
    }
    return;

default_resources:
    /*
     * We don't have any host bridge aperture information from the
     * "native host bridge drivers," e.g., amd_bus or broadcom_bus,
     * so fall back to the defaults historically used by pci_create_bus().
     */
    printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
    pci_add_resource(resources, &ioport_resource);
    pci_add_resource(resources, &iomem_resource);
}

struct pci_root_info __init *alloc_pci_root_info(int bus_min, int bus_max,
                         int node, int link)
{
    struct pci_root_info *info;

    info = kzalloc(sizeof(*info), GFP_KERNEL);

    if (!info)
        return info;

    sprintf(info->name, "PCI Bus #%02x", bus_min);

    INIT_LIST_HEAD(&info->resources);
    info->busn.name  = info->name;
    info->busn.start = bus_min;
    info->busn.end   = bus_max;
    info->busn.flags = IORESOURCE_BUS;
    info->node = node;
    info->link = link;

    list_add_tail(&info->list, &pci_root_infos);

    return info;
}

void __devinit update_res(struct pci_root_info *info, resource_size_t start,
              resource_size_t end, unsigned long flags, int merge)
{
    struct resource *res;
    struct pci_root_res *root_res;

    if (start > end)
        return;

    if (start == MAX_RESOURCE)
        return;

    if (!merge)
        goto addit;

    /* try to merge it with old one */
    list_for_each_entry(root_res, &info->resources, list) {
        resource_size_t final_start, final_end;
        resource_size_t common_start, common_end;

        res = &root_res->res;
        if (res->flags != flags)
            continue;

        common_start = max(res->start, start);
        common_end = min(res->end, end);
        if (common_start > common_end + 1)
            continue;

        final_start = min(res->start, start);
        final_end = max(res->end, end);

        res->start = final_start;
        res->end = final_end;
        return;
    }

addit:

    /* need to add that */
    root_res = kzalloc(sizeof(*root_res), GFP_KERNEL);
    if (!root_res)
        return;

    res = &root_res->res;
    res->name = info->name;
    res->flags = flags;
    res->start = start;
    res->end = end;

    list_add_tail(&root_res->list, &info->resources);
}