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-rw-r--r--drivers/acpi/utils.c42
-rw-r--r--include/acpi/acpi_bus.h3
-rw-r--r--include/linux/acpi.h40
3 files changed, 84 insertions, 1 deletions
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index adbbc1c80a2..3e87c9c538a 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -412,3 +412,45 @@ out:
return status;
}
EXPORT_SYMBOL(acpi_get_physical_device_location);
+
+/**
+ * acpi_evaluate_hotplug_ost: Evaluate _OST for hotplug operations
+ * @handle: ACPI device handle
+ * @source_event: source event code
+ * @status_code: status code
+ * @status_buf: optional detailed information (NULL if none)
+ *
+ * Evaluate _OST for hotplug operations. All ACPI hotplug handlers
+ * must call this function when evaluating _OST for hotplug operations.
+ * When the platform does not support _OST, this function has no effect.
+ */
+acpi_status
+acpi_evaluate_hotplug_ost(acpi_handle handle, u32 source_event,
+ u32 status_code, struct acpi_buffer *status_buf)
+{
+#ifdef ACPI_HOTPLUG_OST
+ union acpi_object params[3] = {
+ {.type = ACPI_TYPE_INTEGER,},
+ {.type = ACPI_TYPE_INTEGER,},
+ {.type = ACPI_TYPE_BUFFER,}
+ };
+ struct acpi_object_list arg_list = {3, params};
+ acpi_status status;
+
+ params[0].integer.value = source_event;
+ params[1].integer.value = status_code;
+ if (status_buf != NULL) {
+ params[2].buffer.pointer = status_buf->pointer;
+ params[2].buffer.length = status_buf->length;
+ } else {
+ params[2].buffer.pointer = NULL;
+ params[2].buffer.length = 0;
+ }
+
+ status = acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
+ return status;
+#else
+ return AE_OK;
+#endif
+}
+EXPORT_SYMBOL(acpi_evaluate_hotplug_ost);
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index b0d62820ada..1139f3a0120 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -50,6 +50,9 @@ acpi_evaluate_reference(acpi_handle handle,
acpi_string pathname,
struct acpi_object_list *arguments,
struct acpi_handle_list *list);
+acpi_status
+acpi_evaluate_hotplug_ost(acpi_handle handle, u32 source_event,
+ u32 status_code, struct acpi_buffer *status_buf);
struct acpi_pld {
unsigned int revision:7; /* 0 */
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index f421dd84f29..b2b4d2ad710 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -277,7 +277,7 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
#define OSC_SB_PAD_SUPPORT 1
#define OSC_SB_PPC_OST_SUPPORT 2
#define OSC_SB_PR3_SUPPORT 4
-#define OSC_SB_CPUHP_OST_SUPPORT 8
+#define OSC_SB_HOTPLUG_OST_SUPPORT 8
#define OSC_SB_APEI_SUPPORT 16
extern bool osc_sb_apei_support_acked;
@@ -309,6 +309,44 @@ extern bool osc_sb_apei_support_acked;
extern acpi_status acpi_pci_osc_control_set(acpi_handle handle,
u32 *mask, u32 req);
+
+/* Enable _OST when all relevant hotplug operations are enabled */
+#if defined(CONFIG_ACPI_HOTPLUG_CPU) && \
+ (defined(CONFIG_ACPI_HOTPLUG_MEMORY) || \
+ defined(CONFIG_ACPI_HOTPLUG_MEMORY_MODULE)) && \
+ (defined(CONFIG_ACPI_CONTAINER) || \
+ defined(CONFIG_ACPI_CONTAINER_MODULE))
+#define ACPI_HOTPLUG_OST
+#endif
+
+/* _OST Source Event Code (OSPM Action) */
+#define ACPI_OST_EC_OSPM_SHUTDOWN 0x100
+#define ACPI_OST_EC_OSPM_EJECT 0x103
+#define ACPI_OST_EC_OSPM_INSERTION 0x200
+
+/* _OST General Processing Status Code */
+#define ACPI_OST_SC_SUCCESS 0x0
+#define ACPI_OST_SC_NON_SPECIFIC_FAILURE 0x1
+#define ACPI_OST_SC_UNRECOGNIZED_NOTIFY 0x2
+
+/* _OST OS Shutdown Processing (0x100) Status Code */
+#define ACPI_OST_SC_OS_SHUTDOWN_DENIED 0x80
+#define ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS 0x81
+#define ACPI_OST_SC_OS_SHUTDOWN_COMPLETED 0x82
+#define ACPI_OST_SC_OS_SHUTDOWN_NOT_SUPPORTED 0x83
+
+/* _OST Ejection Request (0x3, 0x103) Status Code */
+#define ACPI_OST_SC_EJECT_NOT_SUPPORTED 0x80
+#define ACPI_OST_SC_DEVICE_IN_USE 0x81
+#define ACPI_OST_SC_DEVICE_BUSY 0x82
+#define ACPI_OST_SC_EJECT_DEPENDENCY_BUSY 0x83
+#define ACPI_OST_SC_EJECT_IN_PROGRESS 0x84
+
+/* _OST Insertion Request (0x200) Status Code */
+#define ACPI_OST_SC_INSERT_IN_PROGRESS 0x80
+#define ACPI_OST_SC_DRIVER_LOAD_FAILURE 0x81
+#define ACPI_OST_SC_INSERT_NOT_SUPPORTED 0x82
+
extern void acpi_early_init(void);
extern int acpi_nvs_register(__u64 start, __u64 size);