ACPI: IPMI: Add helper to wait for when SMI is selected

On Dell servers, many APCI methods of acpi_power_meter module evaluate
variables inside IPMI region, so the region handler needs to be
installed. In addition to that, the handler needs to be fully
functional, and that depends on SMI being selected.

So add a helper to let acpi_power_meter know when the handler is
installed and ready to be used.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20240320084317.366853-1-kai.heng.feng@canonical.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/acpi/acpi_ipmi.c b/drivers/acpi/acpi_ipmi.c
index 0555f68c2dfd68c2ddc4609fc56b9d4dd738de94..5fba4dab5d088635bd62815e8c3817b4c35a3016 100644 (file)
--- a/drivers/acpi/acpi_ipmi.c
+++ b/drivers/acpi/acpi_ipmi.c
@@ -22,6 +22,8 @@ MODULE_LICENSE("GPL");
 /* the IPMI timeout is 5s */
 #define IPMI_TIMEOUT                   (5000)
 #define ACPI_IPMI_MAX_MSG_LENGTH       64
+/* 2s should be suffient for SMI being selected */
+#define ACPI_IPMI_SMI_SELECTION_TIMEOUT        (2 * HZ)
 
 struct acpi_ipmi_device {
        /* the device list attached to driver_data.ipmi_devices */
@@ -54,6 +56,7 @@ struct ipmi_driver_data {
         * to this selected global IPMI system interface.
         */
        struct acpi_ipmi_device *selected_smi;
+       struct completion smi_selection_done;
 };
 
 struct acpi_ipmi_msg {
@@ -463,8 +466,10 @@ static void ipmi_register_bmc(int iface, struct device *dev)
                if (temp->handle == handle)
                        goto err_lock;
        }
-       if (!driver_data.selected_smi)
+       if (!driver_data.selected_smi) {
                driver_data.selected_smi = ipmi_device;
+               complete(&driver_data.smi_selection_done);
+       }
        list_add_tail(&ipmi_device->head, &driver_data.ipmi_devices);
        mutex_unlock(&driver_data.ipmi_lock);
 
@@ -578,6 +583,20 @@ out_msg:
        return status;
 }
 
+int acpi_wait_for_acpi_ipmi(void)
+{
+       long ret;
+
+       ret = wait_for_completion_interruptible_timeout(&driver_data.smi_selection_done,
+                                                       ACPI_IPMI_SMI_SELECTION_TIMEOUT);
+
+       if (ret <= 0)
+               return -ETIMEDOUT;
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_wait_for_acpi_ipmi);
+
 static int __init acpi_ipmi_init(void)
 {
        int result;
@@ -586,6 +605,8 @@ static int __init acpi_ipmi_init(void)
        if (acpi_disabled)
                return 0;
 
+       init_completion(&driver_data.smi_selection_done);
+
        status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
                                                    ACPI_ADR_SPACE_IPMI,
                                                    &acpi_ipmi_space_handler,

diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 5de954e2b18aaac5c0796466d256f6cd10e1130d..5a69cbd58c5e766631b0610229414c0318f33a0d 100644 (file)
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -976,11 +976,16 @@ static inline void acpi_put_acpi_dev(struct acpi_device *adev)
 {
        acpi_dev_put(adev);
 }
+
+int acpi_wait_for_acpi_ipmi(void);
+
 #else  /* CONFIG_ACPI */
 
 static inline int register_acpi_bus_type(void *bus) { return 0; }
 static inline int unregister_acpi_bus_type(void *bus) { return 0; }
 
+static inline int acpi_wait_for_acpi_ipmi(void) { return 0; }
+
 #endif                         /* CONFIG_ACPI */
 
 #endif /*__ACPI_BUS_H__*/