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-rw-r--r--drivers/acpi/glue.c1
-rw-r--r--drivers/pci/hotplug/pciehp.h1
-rw-r--r--drivers/pci/hotplug/pciehp_core.c3
-rw-r--r--drivers/pci/hotplug/pciehp_hpc.c11
-rw-r--r--drivers/pci/hotplug/pciehprm_acpi.c92
5 files changed, 89 insertions, 19 deletions
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 3937adf4e5e5..aa993715d644 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -203,6 +203,7 @@ acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
acpi_get_devices(PCI_ROOT_HID_STRING, find_pci_rootbridge, &find, NULL);
return find.handle;
}
+EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
/* Get device's handler per its address under its parent */
struct acpi_find_child {
diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index e1c2cea305f8..e71f78318d6e 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -40,6 +40,7 @@
extern int pciehp_poll_mode;
extern int pciehp_poll_time;
extern int pciehp_debug;
+extern int pciehp_force;
/*#define dbg(format, arg...) do { if (pciehp_debug) printk(KERN_DEBUG "%s: " format, MY_NAME , ## arg); } while (0)*/
#define dbg(format, arg...) do { if (pciehp_debug) printk("%s: " format, MY_NAME , ## arg); } while (0)
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index 0bfc37325923..8df704860348 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -39,6 +39,7 @@
int pciehp_debug;
int pciehp_poll_mode;
int pciehp_poll_time;
+int pciehp_force;
struct controller *pciehp_ctrl_list;
#define DRIVER_VERSION "0.4"
@@ -52,9 +53,11 @@ MODULE_LICENSE("GPL");
module_param(pciehp_debug, bool, 0644);
module_param(pciehp_poll_mode, bool, 0644);
module_param(pciehp_poll_time, int, 0644);
+module_param(pciehp_force, bool, 0644);
MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
+MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
#define PCIE_MODULE_NAME "pciehp"
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 5c812b858847..2d2539ba7303 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -1417,9 +1417,14 @@ int pcie_init(struct controller * ctrl, struct pcie_device *dev)
goto abort_free_ctlr;
}
- rc = get_hp_hw_control_from_firmware(ctrl->pci_dev);
- if (rc)
- goto abort_free_ctlr;
+ if (pciehp_force) {
+ dbg("Bypassing BIOS check for pciehp use on %s\n",
+ pci_name(ctrl->pci_dev));
+ } else {
+ rc = get_hp_hw_control_from_firmware(ctrl->pci_dev);
+ if (rc)
+ goto abort_free_ctlr;
+ }
/* Add this HPC instance into the HPC list */
spin_lock(&list_lock);
diff --git a/drivers/pci/hotplug/pciehprm_acpi.c b/drivers/pci/hotplug/pciehprm_acpi.c
index 5acdae3d52b1..4d013f86b1a5 100644
--- a/drivers/pci/hotplug/pciehprm_acpi.c
+++ b/drivers/pci/hotplug/pciehprm_acpi.c
@@ -132,7 +132,7 @@ static acpi_status acpi_run_oshp(acpi_handle handle)
/* run OSHP */
status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL);
if (ACPI_FAILURE(status)) {
- err("%s:%s OSHP fails=0x%x\n", __FUNCTION__, path_name,
+ dbg("%s:%s OSHP fails=0x%x\n", __FUNCTION__, path_name,
status);
} else {
dbg("%s:%s OSHP passes\n", __FUNCTION__, path_name);
@@ -140,32 +140,92 @@ static acpi_status acpi_run_oshp(acpi_handle handle)
return status;
}
+static int is_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)) {
+ acpi_os_free(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)) {
+ acpi_os_free(buffer.pointer);
+ return 1;
+ }
+ }
+ }
+ }
+ return 0;
+}
+
int get_hp_hw_control_from_firmware(struct pci_dev *dev)
{
acpi_status status;
- acpi_handle handle = DEVICE_ACPI_HANDLE(&(dev->dev));
+ acpi_handle chandle, handle = DEVICE_ACPI_HANDLE(&(dev->dev));
+ struct pci_dev *pdev = dev;
+ u8 *path_name;
/*
* Per PCI firmware specification, we should run the ACPI _OSC
- * method to get control of hotplug hardware before using it
+ * method to get control of hotplug hardware before using it.
+ * If an _OSC is missing, we look for an OSHP to do the same thing.
+ * To handle different BIOS behavior, we look for _OSC and OSHP
+ * within the scope of the hotplug controller and its parents, upto
+ * the host bridge under which this controller exists.
*/
- status = pci_osc_control_set(handle,
- OSC_PCI_EXPRESS_NATIVE_HP_CONTROL);
-
- /* Fixme: fail native hotplug if _OSC does not exist for root ports */
- if (status == AE_NOT_FOUND) {
+ while (!handle) {
/*
- * Some older BIOS's don't support _OSC but support
- * OSHP to do the same thing
+ * This hotplug controller was not listed in the ACPI name
+ * space at all. Try to get acpi handle of parent pci bus.
*/
- status = acpi_run_oshp(handle);
+ if (!pdev || !pdev->bus->parent)
+ break;
+ dbg("Could not find %s in acpi namespace, trying parent\n",
+ pci_name(pdev));
+ if (!pdev->bus->parent->self)
+ /* Parent must be a host bridge */
+ handle = acpi_get_pci_rootbridge_handle(
+ pci_domain_nr(pdev->bus->parent),
+ pdev->bus->parent->number);
+ else
+ handle = DEVICE_ACPI_HANDLE(
+ &(pdev->bus->parent->self->dev));
+ pdev = pdev->bus->parent->self;
}
- if (ACPI_FAILURE(status)) {
- err("Cannot get control of hotplug hardware\n");
- return -1;
+
+ while (handle) {
+ path_name = acpi_path_name(handle);
+ dbg("Trying to get hotplug control for %s \n", path_name);
+ status = pci_osc_control_set(handle,
+ OSC_PCI_EXPRESS_NATIVE_HP_CONTROL);
+ if (status == AE_NOT_FOUND)
+ status = acpi_run_oshp(handle);
+ if (ACPI_SUCCESS(status)) {
+ dbg("Gained control for hotplug HW for pci %s (%s)\n",
+ pci_name(dev), path_name);
+ return 0;
+ }
+ if (is_root_bridge(handle))
+ break;
+ chandle = handle;
+ status = acpi_get_parent(chandle, &handle);
+ if (ACPI_FAILURE(status))
+ break;
}
- dbg("Sucess getting control of hotplug hardware\n");
- return 0;
+ err("Cannot get control of hotplug hardware for pci %s\n",
+ pci_name(dev));
+ return -1;
}
void get_hp_params_from_firmware(struct pci_dev *dev,
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-11 14:56:38 +0000