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PCI: acpiphp: Move host bridge hotplug to pci_root.c

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The acpiphp driver is confusing because it contains partial support for PCI
host bridge hotplug as well as support for hotplug of PCI devices.

This patch moves the host bridge hot-add support to pci_root.c and adds
hot-remove support in pci_root.c.

How to test it: if sci_emu patch is applied, find out root bus number to
ACPI root name mapping from dmesg or /sys.  To remove root bus:

  echo "\_SB.PCIB 3" > /sys/kernel/debug/acpi/sci_notify

To add back root bus:

  echo "\_SB.PCIB 1" > /sys/kernel/debug/acpi/sci_notify

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Yinghai Lu
2013-01-21 13:20:48 -08:00
committed by Bjorn Helgaas
parent 92d8aff3a3
commit 668192b678
4 changed files with 143 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
drivers/pci/hotplug/acpiphp_glue.c
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@@ -543,10 +543,13 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
acpi_status status;
acpi_handle handle = bridge->handle;
status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
if (bridge->type != BRIDGE_TYPE_HOST) {
status = acpi_remove_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_bridge);
if (ACPI_FAILURE(status))
err("failed to remove notify handler\n");
if (ACPI_FAILURE(status))
err("failed to remove notify handler\n");
}
if ((bridge->type != BRIDGE_TYPE_HOST) &&
((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
@@ -630,9 +633,6 @@ static void remove_bridge(struct acpi_pci_root *root)
bridge = acpiphp_handle_to_bridge(handle);
if (bridge)
cleanup_bridge(bridge);
else
acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_bridge);
}
static int power_on_slot(struct acpiphp_slot *slot)
@@ -1123,18 +1123,12 @@ static void acpiphp_sanitize_bus(struct pci_bus *bus)
}
/* Program resources in newly inserted bridge */
static int acpiphp_configure_bridge (acpi_handle handle)
static int acpiphp_configure_p2p_bridge(acpi_handle handle)
{
struct pci_bus *bus;
struct pci_dev *pdev = acpi_get_pci_dev(handle);
struct pci_bus *bus = pdev->subordinate;
if (acpi_is_root_bridge(handle)) {
struct acpi_pci_root *root = acpi_pci_find_root(handle);
bus = root->bus;
} else {
struct pci_dev *pdev = acpi_get_pci_dev(handle);
bus = pdev->subordinate;
pci_dev_put(pdev);
}
pci_dev_put(pdev);
pci_bus_size_bridges(bus);
pci_bus_assign_resources(bus);
@@ -1144,7 +1138,7 @@ static int acpiphp_configure_bridge (acpi_handle handle)
return 0;
}
static void handle_bridge_insertion(acpi_handle handle, u32 type)
static void handle_p2p_bridge_insertion(acpi_handle handle, u32 type)
{
struct acpi_device *device;
@@ -1162,8 +1156,8 @@ static void handle_bridge_insertion(acpi_handle handle, u32 type)
err("ACPI device object missing\n");
return;
}
if (!acpiphp_configure_bridge(handle))
add_bridge(handle);
if (!acpiphp_configure_p2p_bridge(handle))
add_p2p_bridge(handle);
else
err("cannot configure and start bridge\n");
@@ -1221,7 +1215,7 @@ static void _handle_hotplug_event_bridge(struct work_struct *work)
if (acpi_bus_get_device(handle, &device)) {
/* This bridge must have just been physically inserted */
handle_bridge_insertion(handle, type);
handle_p2p_bridge_insertion(handle, type);
goto out;
}
@@ -1396,21 +1390,6 @@ static void handle_hotplug_event_func(acpi_handle handle, u32 type,
alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_func);
}
static acpi_status
find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
int *count = (int *)context;
if (!acpi_is_root_bridge(handle))
return AE_OK;
(*count)++;
acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_bridge, NULL);
return AE_OK ;
}
static struct acpi_pci_driver acpi_pci_hp_driver = {
.add = add_bridge,
.remove = remove_bridge,
@@ -1421,15 +1400,7 @@ static struct acpi_pci_driver acpi_pci_hp_driver = {
*/
int __init acpiphp_glue_init(void)
{
int num = 0;
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
if (num <= 0)
return -1;
else
acpi_pci_register_driver(&acpi_pci_hp_driver);
acpi_pci_register_driver(&acpi_pci_hp_driver);
return 0;
}