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x86/PCI: convert to pci_create_root_bus() and pci_scan_root_bus()

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x86 has two kinds of PCI root bus scanning:

(1) ACPI-based, using _CRS resources.  This used pci_create_bus(), not
    pci_scan_bus(), because ACPI hotplug needed to split the
    pci_bus_add_devices() into a separate host bridge .start() method.

    This patch parses the _CRS resources earlier, so we can build a list of
    resources and pass it to pci_create_root_bus().

    Note that as before, we parse the _CRS even if we aren't going to use
    it so we can print it for debugging purposes.

(2) All other, which used either default resources (ioport_resource and
    iomem_resource) or information read from the hardware via amd_bus.c or
    similar.  This used pci_scan_bus().

    This patch converts x86_pci_root_bus_res_quirks() (previously called
    from pcibios_fixup_bus()) to x86_pci_root_bus_resources(), which builds
    a list of resources before we call pci_scan_root_bus().

    We also use x86_pci_root_bus_resources() if we have ACPI but are
    ignoring _CRS.

CC: Yinghai Lu <yinghai.lu@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Bjorn Helgaas 2011-10-28 16:28:14 -06:00 committed by Jesse Barnes
parent 46fbade05c
commit 2cd6975a4f
4 changed files with 45 additions and 35 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/x86/include/asm/topology.h
View file

@ -174,7 +174,7 @@ static inline void arch_fix_phys_package_id(int num, u32 slot)
}
struct pci_bus;
void x86_pci_root_bus_res_quirks(struct pci_bus *b);
void x86_pci_root_bus_resources(int bus, struct list_head *resources);
#ifdef CONFIG_SMP
#define mc_capable() ((boot_cpu_data.x86_max_cores > 1) && \

28
arch/x86/pci/acpi.c
View file

@ -12,7 +12,7 @@ struct pci_root_info {
char *name;
unsigned int res_num;
struct resource *res;
struct pci_bus *bus;
struct list_head *resources;
int busnum;
};
@ -304,23 +304,20 @@ static void add_resources(struct pci_root_info *info)
"ignoring host bridge window %pR (conflicts with %s %pR)\n",
res, conflict->name, conflict);
else
pci_bus_add_resource(info->bus, res, 0);
pci_add_resource(info->resources, res);
}
}
static void
get_current_resources(struct acpi_device *device, int busnum,
int domain, struct pci_bus *bus)
int domain, struct list_head *resources)
{
struct pci_root_info info;
size_t size;
if (pci_use_crs)
pci_bus_remove_resources(bus);
info.bridge = device;
info.bus = bus;
info.res_num = 0;
info.resources = resources;
acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
&info);
if (!info.res_num)
@ -329,7 +326,7 @@ get_current_resources(struct acpi_device *device, int busnum,
size = sizeof(*info.res) * info.res_num;
info.res = kmalloc(size, GFP_KERNEL);
if (!info.res)
goto res_alloc_fail;
return;
info.name = kasprintf(GFP_KERNEL, "PCI Bus %04x:%02x", domain, busnum);
if (!info.name)
@ -344,8 +341,6 @@ get_current_resources(struct acpi_device *device, int busnum,
name_alloc_fail:
kfree(info.res);
res_alloc_fail:
return;
}
struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
@ -353,6 +348,7 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
struct acpi_device *device = root->device;
int domain = root->segment;
int busnum = root->secondary.start;
LIST_HEAD(resources);
struct pci_bus *bus;
struct pci_sysdata *sd;
int node;
@ -407,11 +403,15 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
memcpy(bus->sysdata, sd, sizeof(*sd));
kfree(sd);
} else {
bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
if (bus) {
get_current_resources(device, busnum, domain, bus);
get_current_resources(device, busnum, domain, &resources);
if (list_empty(&resources))
x86_pci_root_bus_resources(busnum, &resources);
bus = pci_create_root_bus(NULL, busnum, &pci_root_ops, sd,
&resources);
if (bus)
bus->subordinate = pci_scan_child_bus(bus);
}
else
pci_free_resource_list(&resources);
}
/* After the PCI-E bus has been walked and all devices discovered,

31
arch/x86/pci/bus_numa.c
View file

@ -7,45 +7,50 @@
int pci_root_num;
struct pci_root_info pci_root_info[PCI_ROOT_NR];
void x86_pci_root_bus_res_quirks(struct pci_bus *b)
void x86_pci_root_bus_resources(int bus, struct list_head *resources)
{
int i;
int j;
struct pci_root_info *info;
/* don't go for it if _CRS is used already */
if (b->resource[0] != &ioport_resource ||
b->resource[1] != &iomem_resource)
return;
if (!pci_root_num)
return;
goto default_resources;
for (i = 0; i < pci_root_num; i++) {
if (pci_root_info[i].bus_min == b->number)
if (pci_root_info[i].bus_min == bus)
break;
}
if (i == pci_root_num)
return;
goto default_resources;
printk(KERN_DEBUG "PCI: peer root bus %02x res updated from pci conf\n",
b->number);
printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n",
bus);
pci_bus_remove_resources(b);
info = &pci_root_info[i];
for (j = 0; j < info->res_num; j++) {
struct resource *res;
struct resource *root;
res = &info->res[j];
pci_bus_add_resource(b, res, 0);
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);
}
void __devinit update_res(struct pci_root_info *info, resource_size_t start,

19
arch/x86/pci/common.c
View file

@ -164,9 +164,6 @@ void __devinit pcibios_fixup_bus(struct pci_bus *b)
{
struct pci_dev *dev;
/* root bus? */
if (!b->parent)
x86_pci_root_bus_res_quirks(b);
pci_read_bridge_bases(b);
list_for_each_entry(dev, &b->devices, bus_list)
pcibios_fixup_device_resources(dev);
@ -433,6 +430,7 @@ void __init dmi_check_pciprobe(void)
struct pci_bus * __devinit pcibios_scan_root(int busnum)
{
LIST_HEAD(resources);
struct pci_bus *bus = NULL;
struct pci_sysdata *sd;
@ -456,9 +454,12 @@ struct pci_bus * __devinit pcibios_scan_root(int busnum)
sd->node = get_mp_bus_to_node(busnum);
printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
bus = pci_scan_bus(busnum, &pci_root_ops, sd);
if (!bus)
x86_pci_root_bus_resources(busnum, &resources);
bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, sd, &resources);
if (!bus) {
pci_free_resource_list(&resources);
kfree(sd);
}
return bus;
}
@ -639,6 +640,7 @@ int pci_ext_cfg_avail(struct pci_dev *dev)
struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
{
LIST_HEAD(resources);
struct pci_bus *bus = NULL;
struct pci_sysdata *sd;
@ -653,9 +655,12 @@ struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops,
return NULL;
}
sd->node = node;
bus = pci_scan_bus(busno, ops, sd);
if (!bus)
x86_pci_root_bus_resources(busno, &resources);
bus = pci_scan_root_bus(NULL, busno, ops, sd, &resources);
if (!bus) {
pci_free_resource_list(&resources);
kfree(sd);
}
return bus;
}