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![Rafael J. Wysocki](/assets/img/avatar_default.png)
Because suspend-to-idle is always supported and on x86 it is the only way to suspend the system if S3 is not supported by the platform, the kernel attempts to enter low-power S0 idle in the suspend-to-idle flow regardless of whether or not the ACPI_FADT_LOW_POWER_S0 flag is set in the FADT. However, if that flag is not set, residency counters associated with low-power S0 idle may not count and the platform may refuse to put the EC into a low-power mode, for example. For this reason, print diagnostic messages when the platform should achieve significant energy savings in low-power S0 idle (because the ACPI_FADT_LOW_POWER_S0 flag is set in the FADT) and when suspend-to-idle becomes the default suspend method (because low-power S0 idle should be equally or more efficient than S3, if available). Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
566 lines
15 KiB
C
566 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Architecture-specific ACPI-based support for suspend-to-idle.
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*
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* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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* Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
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* Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
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*
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* On platforms supporting the Low Power S0 Idle interface there is an ACPI
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* device object with the PNP0D80 compatible device ID (System Power Management
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* Controller) and a specific _DSM method under it. That method, if present,
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* can be used to indicate to the platform that the OS is transitioning into a
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* low-power state in which certain types of activity are not desirable or that
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* it is leaving such a state, which allows the platform to adjust its operation
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* mode accordingly.
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/suspend.h>
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#include "../sleep.h"
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#ifdef CONFIG_SUSPEND
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static bool sleep_no_lps0 __read_mostly;
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module_param(sleep_no_lps0, bool, 0644);
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MODULE_PARM_DESC(sleep_no_lps0, "Do not use the special LPS0 device interface");
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static const struct acpi_device_id lps0_device_ids[] = {
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{"PNP0D80", },
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{"", },
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};
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/* Microsoft platform agnostic UUID */
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#define ACPI_LPS0_DSM_UUID_MICROSOFT "11e00d56-ce64-47ce-837b-1f898f9aa461"
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#define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
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#define ACPI_LPS0_GET_DEVICE_CONSTRAINTS 1
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#define ACPI_LPS0_SCREEN_OFF 3
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#define ACPI_LPS0_SCREEN_ON 4
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#define ACPI_LPS0_ENTRY 5
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#define ACPI_LPS0_EXIT 6
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#define ACPI_LPS0_MS_ENTRY 7
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#define ACPI_LPS0_MS_EXIT 8
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/* AMD */
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#define ACPI_LPS0_DSM_UUID_AMD "e3f32452-febc-43ce-9039-932122d37721"
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#define ACPI_LPS0_ENTRY_AMD 2
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#define ACPI_LPS0_EXIT_AMD 3
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#define ACPI_LPS0_SCREEN_OFF_AMD 4
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#define ACPI_LPS0_SCREEN_ON_AMD 5
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static acpi_handle lps0_device_handle;
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static guid_t lps0_dsm_guid;
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static int lps0_dsm_func_mask;
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static guid_t lps0_dsm_guid_microsoft;
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static int lps0_dsm_func_mask_microsoft;
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/* Device constraint entry structure */
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struct lpi_device_info {
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char *name;
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int enabled;
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union acpi_object *package;
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};
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/* Constraint package structure */
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struct lpi_device_constraint {
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int uid;
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int min_dstate;
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int function_states;
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};
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struct lpi_constraints {
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acpi_handle handle;
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int min_dstate;
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};
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/* AMD Constraint package structure */
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struct lpi_device_constraint_amd {
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char *name;
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int enabled;
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int function_states;
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int min_dstate;
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};
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static LIST_HEAD(lps0_s2idle_devops_head);
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static struct lpi_constraints *lpi_constraints_table;
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static int lpi_constraints_table_size;
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static int rev_id;
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static void lpi_device_get_constraints_amd(void)
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{
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union acpi_object *out_obj;
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int i, j, k;
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out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
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rev_id, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
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NULL, ACPI_TYPE_PACKAGE);
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acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
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out_obj ? "successful" : "failed");
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if (!out_obj)
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return;
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for (i = 0; i < out_obj->package.count; i++) {
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union acpi_object *package = &out_obj->package.elements[i];
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if (package->type == ACPI_TYPE_PACKAGE) {
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lpi_constraints_table = kcalloc(package->package.count,
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sizeof(*lpi_constraints_table),
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GFP_KERNEL);
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if (!lpi_constraints_table)
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goto free_acpi_buffer;
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acpi_handle_debug(lps0_device_handle,
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"LPI: constraints list begin:\n");
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for (j = 0; j < package->package.count; ++j) {
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union acpi_object *info_obj = &package->package.elements[j];
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struct lpi_device_constraint_amd dev_info = {};
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struct lpi_constraints *list;
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acpi_status status;
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for (k = 0; k < info_obj->package.count; ++k) {
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union acpi_object *obj = &info_obj->package.elements[k];
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list = &lpi_constraints_table[lpi_constraints_table_size];
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list->min_dstate = -1;
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switch (k) {
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case 0:
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dev_info.enabled = obj->integer.value;
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break;
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case 1:
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dev_info.name = obj->string.pointer;
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break;
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case 2:
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dev_info.function_states = obj->integer.value;
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break;
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case 3:
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dev_info.min_dstate = obj->integer.value;
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break;
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}
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if (!dev_info.enabled || !dev_info.name ||
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!dev_info.min_dstate)
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continue;
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status = acpi_get_handle(NULL, dev_info.name,
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&list->handle);
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if (ACPI_FAILURE(status))
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continue;
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acpi_handle_debug(lps0_device_handle,
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"Name:%s\n", dev_info.name);
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list->min_dstate = dev_info.min_dstate;
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if (list->min_dstate < 0) {
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acpi_handle_debug(lps0_device_handle,
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"Incomplete constraint defined\n");
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continue;
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}
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}
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lpi_constraints_table_size++;
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}
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}
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}
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acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
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free_acpi_buffer:
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ACPI_FREE(out_obj);
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}
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static void lpi_device_get_constraints(void)
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{
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union acpi_object *out_obj;
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int i;
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out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
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1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
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NULL, ACPI_TYPE_PACKAGE);
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acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
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out_obj ? "successful" : "failed");
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if (!out_obj)
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return;
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lpi_constraints_table = kcalloc(out_obj->package.count,
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sizeof(*lpi_constraints_table),
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GFP_KERNEL);
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if (!lpi_constraints_table)
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goto free_acpi_buffer;
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acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
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for (i = 0; i < out_obj->package.count; i++) {
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struct lpi_constraints *constraint;
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acpi_status status;
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union acpi_object *package = &out_obj->package.elements[i];
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struct lpi_device_info info = { };
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int package_count = 0, j;
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if (!package)
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continue;
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for (j = 0; j < package->package.count; ++j) {
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union acpi_object *element =
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&(package->package.elements[j]);
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switch (element->type) {
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case ACPI_TYPE_INTEGER:
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info.enabled = element->integer.value;
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break;
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case ACPI_TYPE_STRING:
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info.name = element->string.pointer;
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break;
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case ACPI_TYPE_PACKAGE:
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package_count = element->package.count;
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info.package = element->package.elements;
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break;
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}
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}
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if (!info.enabled || !info.package || !info.name)
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continue;
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constraint = &lpi_constraints_table[lpi_constraints_table_size];
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status = acpi_get_handle(NULL, info.name, &constraint->handle);
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if (ACPI_FAILURE(status))
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continue;
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acpi_handle_debug(lps0_device_handle,
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"index:%d Name:%s\n", i, info.name);
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constraint->min_dstate = -1;
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for (j = 0; j < package_count; ++j) {
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union acpi_object *info_obj = &info.package[j];
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union acpi_object *cnstr_pkg;
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union acpi_object *obj;
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struct lpi_device_constraint dev_info;
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switch (info_obj->type) {
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case ACPI_TYPE_INTEGER:
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/* version */
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break;
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case ACPI_TYPE_PACKAGE:
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if (info_obj->package.count < 2)
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break;
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cnstr_pkg = info_obj->package.elements;
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obj = &cnstr_pkg[0];
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dev_info.uid = obj->integer.value;
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obj = &cnstr_pkg[1];
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dev_info.min_dstate = obj->integer.value;
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acpi_handle_debug(lps0_device_handle,
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"uid:%d min_dstate:%s\n",
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dev_info.uid,
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acpi_power_state_string(dev_info.min_dstate));
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constraint->min_dstate = dev_info.min_dstate;
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break;
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}
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}
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if (constraint->min_dstate < 0) {
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acpi_handle_debug(lps0_device_handle,
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"Incomplete constraint defined\n");
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continue;
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}
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lpi_constraints_table_size++;
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}
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acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
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free_acpi_buffer:
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ACPI_FREE(out_obj);
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}
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static void lpi_check_constraints(void)
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{
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int i;
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for (i = 0; i < lpi_constraints_table_size; ++i) {
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acpi_handle handle = lpi_constraints_table[i].handle;
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struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
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if (!adev)
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continue;
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acpi_handle_debug(handle,
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"LPI: required min power state:%s current power state:%s\n",
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acpi_power_state_string(lpi_constraints_table[i].min_dstate),
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acpi_power_state_string(adev->power.state));
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if (!adev->flags.power_manageable) {
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acpi_handle_info(handle, "LPI: Device not power manageable\n");
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lpi_constraints_table[i].handle = NULL;
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continue;
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}
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if (adev->power.state < lpi_constraints_table[i].min_dstate)
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acpi_handle_info(handle,
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"LPI: Constraint not met; min power state:%s current power state:%s\n",
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acpi_power_state_string(lpi_constraints_table[i].min_dstate),
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acpi_power_state_string(adev->power.state));
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}
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}
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static void acpi_sleep_run_lps0_dsm(unsigned int func, unsigned int func_mask, guid_t dsm_guid)
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{
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union acpi_object *out_obj;
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if (!(func_mask & (1 << func)))
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return;
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out_obj = acpi_evaluate_dsm(lps0_device_handle, &dsm_guid,
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rev_id, func, NULL);
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ACPI_FREE(out_obj);
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acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
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func, out_obj ? "successful" : "failed");
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}
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static bool acpi_s2idle_vendor_amd(void)
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{
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return boot_cpu_data.x86_vendor == X86_VENDOR_AMD;
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}
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static int validate_dsm(acpi_handle handle, const char *uuid, int rev, guid_t *dsm_guid)
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{
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union acpi_object *obj;
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int ret = -EINVAL;
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guid_parse(uuid, dsm_guid);
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obj = acpi_evaluate_dsm(handle, dsm_guid, rev, 0, NULL);
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/* Check if the _DSM is present and as expected. */
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if (!obj || obj->type != ACPI_TYPE_BUFFER || obj->buffer.length == 0 ||
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obj->buffer.length > sizeof(u32)) {
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acpi_handle_debug(handle,
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"_DSM UUID %s rev %d function 0 evaluation failed\n", uuid, rev);
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goto out;
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}
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ret = *(int *)obj->buffer.pointer;
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acpi_handle_debug(handle, "_DSM UUID %s rev %d function mask: 0x%x\n", uuid, rev, ret);
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out:
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ACPI_FREE(obj);
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return ret;
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}
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static int lps0_device_attach(struct acpi_device *adev,
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const struct acpi_device_id *not_used)
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{
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if (lps0_device_handle)
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return 0;
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if (acpi_s2idle_vendor_amd()) {
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/* AMD0004, AMD0005, AMDI0005:
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* - Should use rev_id 0x0
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* - function mask > 0x3: Should use AMD method, but has off by one bug
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* - function mask = 0x3: Should use Microsoft method
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* AMDI0006:
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* - should use rev_id 0x0
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* - function mask = 0x3: Should use Microsoft method
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* AMDI0007:
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* - Should use rev_id 0x2
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* - Should only use AMD method
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*/
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const char *hid = acpi_device_hid(adev);
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rev_id = strcmp(hid, "AMDI0007") ? 0 : 2;
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lps0_dsm_func_mask = validate_dsm(adev->handle,
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ACPI_LPS0_DSM_UUID_AMD, rev_id, &lps0_dsm_guid);
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lps0_dsm_func_mask_microsoft = validate_dsm(adev->handle,
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ACPI_LPS0_DSM_UUID_MICROSOFT, 0,
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&lps0_dsm_guid_microsoft);
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if (lps0_dsm_func_mask > 0x3 && (!strcmp(hid, "AMD0004") ||
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!strcmp(hid, "AMD0005") ||
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!strcmp(hid, "AMDI0005"))) {
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lps0_dsm_func_mask = (lps0_dsm_func_mask << 1) | 0x1;
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acpi_handle_debug(adev->handle, "_DSM UUID %s: Adjusted function mask: 0x%x\n",
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ACPI_LPS0_DSM_UUID_AMD, lps0_dsm_func_mask);
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} else if (lps0_dsm_func_mask_microsoft > 0 &&
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(!strcmp(hid, "AMDI0007") ||
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!strcmp(hid, "AMDI0008"))) {
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lps0_dsm_func_mask_microsoft = -EINVAL;
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acpi_handle_debug(adev->handle, "_DSM Using AMD method\n");
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}
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} else {
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rev_id = 1;
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lps0_dsm_func_mask = validate_dsm(adev->handle,
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ACPI_LPS0_DSM_UUID, rev_id, &lps0_dsm_guid);
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lps0_dsm_func_mask_microsoft = -EINVAL;
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}
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if (lps0_dsm_func_mask < 0 && lps0_dsm_func_mask_microsoft < 0)
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return 0; //function evaluation failed
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lps0_device_handle = adev->handle;
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if (acpi_s2idle_vendor_amd())
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lpi_device_get_constraints_amd();
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else
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lpi_device_get_constraints();
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/*
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* Use suspend-to-idle by default if ACPI_FADT_LOW_POWER_S0 is set in
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* the FADT and the default suspend mode was not set from the command
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* line.
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*/
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if ((acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) &&
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mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3) {
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mem_sleep_current = PM_SUSPEND_TO_IDLE;
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pr_info("Low-power S0 idle used by default for system suspend\n");
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}
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/*
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* Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
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* EC GPE to be enabled while suspended for certain wakeup devices to
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* work, so mark it as wakeup-capable.
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*/
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acpi_ec_mark_gpe_for_wake();
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return 0;
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}
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static struct acpi_scan_handler lps0_handler = {
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.ids = lps0_device_ids,
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.attach = lps0_device_attach,
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};
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int acpi_s2idle_prepare_late(void)
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{
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struct acpi_s2idle_dev_ops *handler;
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if (!lps0_device_handle || sleep_no_lps0)
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return 0;
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if (pm_debug_messages_on)
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lpi_check_constraints();
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/* Screen off */
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if (lps0_dsm_func_mask > 0)
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acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
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ACPI_LPS0_SCREEN_OFF_AMD :
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ACPI_LPS0_SCREEN_OFF,
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lps0_dsm_func_mask, lps0_dsm_guid);
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if (lps0_dsm_func_mask_microsoft > 0)
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF,
|
|
lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
|
|
|
|
/* LPS0 entry */
|
|
if (lps0_dsm_func_mask > 0)
|
|
acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
|
|
ACPI_LPS0_ENTRY_AMD :
|
|
ACPI_LPS0_ENTRY,
|
|
lps0_dsm_func_mask, lps0_dsm_guid);
|
|
if (lps0_dsm_func_mask_microsoft > 0) {
|
|
acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY,
|
|
lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
|
|
/* modern standby entry */
|
|
acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_ENTRY,
|
|
lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
|
|
}
|
|
|
|
list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node) {
|
|
if (handler->prepare)
|
|
handler->prepare();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void acpi_s2idle_restore_early(void)
|
|
{
|
|
struct acpi_s2idle_dev_ops *handler;
|
|
|
|
if (!lps0_device_handle || sleep_no_lps0)
|
|
return;
|
|
|
|
list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node)
|
|
if (handler->restore)
|
|
handler->restore();
|
|
|
|
/* Modern standby exit */
|
|
if (lps0_dsm_func_mask_microsoft > 0)
|
|
acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_EXIT,
|
|
lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
|
|
|
|
/* LPS0 exit */
|
|
if (lps0_dsm_func_mask > 0)
|
|
acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
|
|
ACPI_LPS0_EXIT_AMD :
|
|
ACPI_LPS0_EXIT,
|
|
lps0_dsm_func_mask, lps0_dsm_guid);
|
|
if (lps0_dsm_func_mask_microsoft > 0)
|
|
acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT,
|
|
lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
|
|
|
|
/* Screen on */
|
|
if (lps0_dsm_func_mask_microsoft > 0)
|
|
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON,
|
|
lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
|
|
if (lps0_dsm_func_mask > 0)
|
|
acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
|
|
ACPI_LPS0_SCREEN_ON_AMD :
|
|
ACPI_LPS0_SCREEN_ON,
|
|
lps0_dsm_func_mask, lps0_dsm_guid);
|
|
}
|
|
|
|
static const struct platform_s2idle_ops acpi_s2idle_ops_lps0 = {
|
|
.begin = acpi_s2idle_begin,
|
|
.prepare = acpi_s2idle_prepare,
|
|
.prepare_late = acpi_s2idle_prepare_late,
|
|
.wake = acpi_s2idle_wake,
|
|
.restore_early = acpi_s2idle_restore_early,
|
|
.restore = acpi_s2idle_restore,
|
|
.end = acpi_s2idle_end,
|
|
};
|
|
|
|
void acpi_s2idle_setup(void)
|
|
{
|
|
acpi_scan_add_handler(&lps0_handler);
|
|
s2idle_set_ops(&acpi_s2idle_ops_lps0);
|
|
}
|
|
|
|
int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg)
|
|
{
|
|
if (!lps0_device_handle || sleep_no_lps0)
|
|
return -ENODEV;
|
|
|
|
lock_system_sleep();
|
|
list_add(&arg->list_node, &lps0_s2idle_devops_head);
|
|
unlock_system_sleep();
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_register_lps0_dev);
|
|
|
|
void acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops *arg)
|
|
{
|
|
if (!lps0_device_handle || sleep_no_lps0)
|
|
return;
|
|
|
|
lock_system_sleep();
|
|
list_del(&arg->list_node);
|
|
unlock_system_sleep();
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_unregister_lps0_dev);
|
|
|
|
#endif /* CONFIG_SUSPEND */
|