Previously, we only printed the immediately downstream bus number, but a
host bridge claims a range of bus numbers. _CRS tells us the range, and
it helps understand the system topology, so let's show it.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@xxxxxx>
---
drivers/acpi/pci_root.c | 33 ++++++++++++++++++---------------
1 files changed, 18 insertions(+), 15 deletions(-)
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 1af8081..aa9eeee 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -152,7 +152,7 @@ EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
static acpi_status
get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
{
- int *busnr = data;
+ struct resource *res = data;
struct acpi_resource_address64 address;
if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
@@ -162,28 +162,27 @@ get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
acpi_resource_to_address64(resource, &address);
if ((address.address_length > 0) &&
- (address.resource_type == ACPI_BUS_NUMBER_RANGE))
- *busnr = address.minimum;
+ (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
+ res->start = address.minimum;
+ res->end = address.minimum + address.address_length - 1;
+ }
return AE_OK;
}
static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
- unsigned long long *bus)
+ struct resource *res)
{
acpi_status status;
- int busnum;
- busnum = -1;
+ res->start = -1;
status =
acpi_walk_resources(handle, METHOD_NAME__CRS,
- get_root_bridge_busnr_callback, &busnum);
+ get_root_bridge_busnr_callback, res);
if (ACPI_FAILURE(status))
return status;
- /* Check if we really get a bus number from _CRS */
- if (busnum == -1)
+ if (res->start == -1)
return AE_ERROR;
- *bus = busnum;
return AE_OK;
}
@@ -474,6 +473,7 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
acpi_handle handle;
struct acpi_device *child;
u32 flags, base_flags;
+ struct resource secondary;
segment = 0;
status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
@@ -484,9 +484,11 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
}
/* Check _CRS first, then _BBN. If no _BBN, default to zero. */
- bus = 0;
- status = try_get_root_bridge_busnr(device->handle, &bus);
- if (ACPI_FAILURE(status)) {
+ secondary.start = 0;
+ status = try_get_root_bridge_busnr(device->handle, &secondary);
+ if (ACPI_SUCCESS(status)) {
+ bus = secondary.start;
+ } else {
status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL, &bus);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
printk(KERN_ERR PREFIX
@@ -521,9 +523,10 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
/* TBD: Locking */
list_add_tail(&root->node, &acpi_pci_roots);
- printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
+ printk(KERN_INFO PREFIX "%s [%s] (domain %04x [bus %02x-%02x])\n",
acpi_device_name(device), acpi_device_bid(device),
- root->segment, root->bus_nr);
+ root->segment,
+ (unsigned int) secondary.start, (unsigned int) secondary.end);
/*
* Scan the Root Bridge
--
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