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Message-ID: <20090602152446.7346.31536.stgit@bob.kio>
Date: Tue, 02 Jun 2009 09:24:46 -0600
From: Alex Chiang <achiang@...com>
To: lenb@...nel.org
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org
Subject: [PATCH 02/10] ACPI: Introduce acpi_is_root_bridge()
Returns whether an ACPI CA node is a PCI root bridge or not.
This API is generically useful, and shouldn't just be a hotplug function.
Note that this patch does not simply move code around. The old
implementation did not check for PCIe _HIDs. The new implementation
does check, similar to the logic in acpi_ev_is_pci_root_bridge().
Signed-off-by: Alex Chiang <achiang@...com>
---
drivers/acpi/pci_root.c | 41 ++++++++++++++++++++++++++++++++++++
drivers/pci/hotplug/acpi_pcihp.c | 40 ++---------------------------------
drivers/pci/hotplug/acpiphp_glue.c | 2 +-
include/acpi/acpi_bus.h | 1 +
include/linux/pci_hotplug.h | 1 -
5 files changed, 45 insertions(+), 40 deletions(-)
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index ca8dba3..853a6e4 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -142,6 +142,47 @@ acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
+/**
+ * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
+ * @handle - the ACPI CA node in question.
+ */
+int acpi_is_root_bridge(acpi_handle handle)
+{
+ acpi_status status;
+ struct acpi_device_info *info;
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+ int i, ret = 0;
+
+ status = acpi_get_object_info(handle, &buffer);
+ if (ACPI_FAILURE(status))
+ goto out;
+
+ info = buffer.pointer;
+ if ((info->valid & ACPI_VALID_HID) &&
+ !strcmp(PCI_ROOT_HID_STRING, info->hardware_id.value)) {
+ ret = 1;
+ goto out;
+ }
+ if ((info->valid & ACPI_VALID_HID) &&
+ !strcmp(PCI_EXPRESS_ROOT_HID_STRING, info->hardware_id.value)) {
+ ret = 1;
+ goto out;
+ }
+ if (info->valid & ACPI_VALID_CID) {
+ for (i = 0; i < info->compatibility_id.count; i++) {
+ if (!strcmp(PCI_ROOT_HID_STRING,
+ info->compatibility_id.id[i].value)) {
+ ret = 1;
+ goto out;
+ }
+ }
+ }
+out:
+ kfree(buffer.pointer);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
+
static acpi_status
get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
{
diff --git a/drivers/pci/hotplug/acpi_pcihp.c b/drivers/pci/hotplug/acpi_pcihp.c
index fbc63d5..eb15958 100644
--- a/drivers/pci/hotplug/acpi_pcihp.c
+++ b/drivers/pci/hotplug/acpi_pcihp.c
@@ -354,7 +354,7 @@ acpi_status acpi_get_hp_params_from_firmware(struct pci_bus *bus,
status = acpi_run_hpp(handle, hpp);
if (ACPI_SUCCESS(status))
break;
- if (acpi_root_bridge(handle))
+ if (acpi_is_root_bridge(handle))
break;
status = acpi_get_parent(handle, &phandle);
if (ACPI_FAILURE(status))
@@ -428,7 +428,7 @@ int acpi_get_hp_hw_control_from_firmware(struct pci_dev *pdev, u32 flags)
status = acpi_run_oshp(handle);
if (ACPI_SUCCESS(status))
goto got_one;
- if (acpi_root_bridge(handle))
+ if (acpi_is_root_bridge(handle))
break;
chandle = handle;
status = acpi_get_parent(chandle, &handle);
@@ -449,42 +449,6 @@ got_one:
}
EXPORT_SYMBOL(acpi_get_hp_hw_control_from_firmware);
-/* acpi_root_bridge - check to see if this acpi object is a root bridge
- *
- * @handle - the acpi object in question.
- */
-int acpi_root_bridge(acpi_handle handle)
-{
- acpi_status status;
- struct acpi_device_info *info;
- struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
- int i;
-
- status = acpi_get_object_info(handle, &buffer);
- if (ACPI_SUCCESS(status)) {
- info = buffer.pointer;
- if ((info->valid & ACPI_VALID_HID) &&
- !strcmp(PCI_ROOT_HID_STRING,
- info->hardware_id.value)) {
- kfree(buffer.pointer);
- return 1;
- }
- if (info->valid & ACPI_VALID_CID) {
- for (i=0; i < info->compatibility_id.count; i++) {
- if (!strcmp(PCI_ROOT_HID_STRING,
- info->compatibility_id.id[i].value)) {
- kfree(buffer.pointer);
- return 1;
- }
- }
- }
- kfree(buffer.pointer);
- }
- return 0;
-}
-EXPORT_SYMBOL_GPL(acpi_root_bridge);
-
-
static int is_ejectable(acpi_handle handle)
{
acpi_status status;
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 3a6064b..fc6636e 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -1631,7 +1631,7 @@ find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
int *count = (int *)context;
- if (acpi_root_bridge(handle)) {
+ if (acpi_is_root_bridge(handle)) {
acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_bridge, NULL);
(*count)++;
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 0f50167..494088b 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -372,6 +372,7 @@ struct device *acpi_get_physical_pci_device(acpi_handle);
/* helper */
acpi_handle acpi_get_child(acpi_handle, acpi_integer);
+int acpi_is_root_bridge(acpi_handle);
acpi_handle acpi_get_pci_rootbridge_handle(unsigned int, unsigned int);
#define DEVICE_ACPI_HANDLE(dev) ((acpi_handle)((dev)->archdata.acpi_handle))
diff --git a/include/linux/pci_hotplug.h b/include/linux/pci_hotplug.h
index 2099874..a3576ef 100644
--- a/include/linux/pci_hotplug.h
+++ b/include/linux/pci_hotplug.h
@@ -226,7 +226,6 @@ struct hotplug_params {
extern acpi_status acpi_get_hp_params_from_firmware(struct pci_bus *bus,
struct hotplug_params *hpp);
int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags);
-int acpi_root_bridge(acpi_handle handle);
int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle);
int acpi_pci_detect_ejectable(struct pci_bus *pbus);
#endif
--
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