ACPI: processor: Export acpi_processor_evaluate_cst()

The intel_idle driver will be modified to use ACPI _CST subsequently
and it will need to call acpi_processor_evaluate_cst(), so move that
function to acpi_processor.c so that it is always present (which is
required by intel_idle) and export it to modules to allow the ACPI
processor driver (which is modular) to call it.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 0 insertions, 142 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 7c2fe3b2ec31..dcc289e30166 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -297,148 +297,6 @@ static int acpi_processor_get_power_info_default(struct acpi_processor *pr)
 	return 0;
 }
 
-static int acpi_processor_evaluate_cst(acpi_handle handle, u32 cpu,
-				       struct acpi_processor_power *info)
-{
-	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
-	union acpi_object *cst;
-	acpi_status status;
-	u64 count;
-	int last_index = 0;
-	int i, ret = 0;
-
-	status = acpi_evaluate_object(handle, "_CST", NULL, &buffer);
-	if (ACPI_FAILURE(status)) {
-		acpi_handle_debug(handle, "No _CST\n");
-		return -ENODEV;
-	}
-
-	cst = buffer.pointer;
-
-	/* There must be at least 2 elements. */
-	if (!cst || cst->type != ACPI_TYPE_PACKAGE || cst->package.count < 2) {
-		acpi_handle_warn(handle, "Invalid _CST output\n");
-		ret = -EFAULT;
-		goto end;
-	}
-
-	count = cst->package.elements[0].integer.value;
-
-	/* Validate the number of C-states. */
-	if (count < 1 || count != cst->package.count - 1) {
-		acpi_handle_warn(handle, "Inconsistent _CST data\n");
-		ret = -EFAULT;
-		goto end;
-	}
-
-	for (i = 1; i <= count; i++) {
-		union acpi_object *element;
-		union acpi_object *obj;
-		struct acpi_power_register *reg;
-		struct acpi_processor_cx cx;
-
-		/*
-		 * If there is not enough space for all C-states, skip the
-		 * excess ones and log a warning.
-		 */
-		if (last_index >= ACPI_PROCESSOR_MAX_POWER - 1) {
-			acpi_handle_warn(handle,
-					 "No room for more idle states (limit: %d)\n",
-					 ACPI_PROCESSOR_MAX_POWER - 1);
-			break;
-		}
-
-		memset(&cx, 0, sizeof(cx));
-
-		element = &cst->package.elements[i];
-		if (element->type != ACPI_TYPE_PACKAGE)
-			continue;
-
-		if (element->package.count != 4)
-			continue;
-
-		obj = &element->package.elements[0];
-
-		if (obj->type != ACPI_TYPE_BUFFER)
-			continue;
-
-		reg = (struct acpi_power_register *)obj->buffer.pointer;
-
-		obj = &element->package.elements[1];
-		if (obj->type != ACPI_TYPE_INTEGER)
-			continue;
-
-		cx.type = obj->integer.value;
-		/*
-		 * There are known cases in which the _CST output does not
-		 * contain C1, so if the type of the first state found is not
-		 * C1, leave an empty slot for C1 to be filled in later.
-		 */
-		if (i == 1 && cx.type != ACPI_STATE_C1)
-			last_index = 1;
-
-		cx.address = reg->address;
-		cx.index = last_index + 1;
-
-		if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {
-			if (!acpi_processor_ffh_cstate_probe(cpu, &cx, reg)) {
-				/*
-				 * In the majority of cases _CST describes C1 as
-				 * a FIXED_HARDWARE C-state, but if the command
-				 * line forbids using MWAIT, use CSTATE_HALT for
-				 * C1 regardless.
-				 */
-				if (cx.type == ACPI_STATE_C1 &&
-				    boot_option_idle_override == IDLE_NOMWAIT) {
-					cx.entry_method = ACPI_CSTATE_HALT;
-					snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
-				} else {
-					cx.entry_method = ACPI_CSTATE_FFH;
-				}
-			} else if (cx.type == ACPI_STATE_C1) {
-				/*
-				 * In the special case of C1, FIXED_HARDWARE can
-				 * be handled by executing the HLT instruction.
-				 */
-				cx.entry_method = ACPI_CSTATE_HALT;
-				snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
-			} else {
-				continue;
-			}
-		} else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
-			cx.entry_method = ACPI_CSTATE_SYSTEMIO;
-			snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x",
-				 cx.address);
-		} else {
-			continue;
-		}
-
-		if (cx.type == ACPI_STATE_C1)
-			cx.valid = 1;
-
-		obj = &element->package.elements[2];
-		if (obj->type != ACPI_TYPE_INTEGER)
-			continue;
-
-		cx.latency = obj->integer.value;
-
-		obj = &element->package.elements[3];
-		if (obj->type != ACPI_TYPE_INTEGER)
-			continue;
-
-		memcpy(&info->states[++last_index], &cx, sizeof(cx));
-	}
-
-	acpi_handle_info(handle, "Found %d idle states\n", last_index);
-
-	info->count = last_index;
-
-      end:
-	kfree(buffer.pointer);
-
-	return ret;
-}
-
 static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
 {
 	int ret;