summaryrefslogtreecommitdiff
path: root/drivers/acpi
diff options
context:
space:
mode:
authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2023-08-25 20:55:47 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2023-08-25 20:55:47 +0200
commit56db6a8e5a5942930b6e788e555e58f0f68edbd5 (patch)
tree00c31e996b440a4c5584a45d585acfe1750ce758 /drivers/acpi
parent0960a3cbfd9722b21c439bddb051e140600d9144 (diff)
parent1c2a66d47de36608551d73562d01bb4afcf1d61a (diff)
Merge branch 'acpi-pm'
Merge ACPI power management updates for 6.6-rc1: - Fix and clean up suspend-to-idle interface for AMD systems (Mario Limonciello, Andy Shevchenko). * acpi-pm: ACPI: x86: s2idle: Add a function to get LPS0 constraint for a device ACPI: x86: s2idle: Add for_each_lpi_constraint() helper ACPI: x86: s2idle: Add more debugging for AMD constraints parsing ACPI: x86: s2idle: Fix a logic error parsing AMD constraints table ACPI: x86: s2idle: Catch multiple ACPI_TYPE_PACKAGE objects ACPI: x86: s2idle: Post-increment variables when getting constraints ACPI: Adjust #ifdef for *_lps0_dev use
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/x86/s2idle.c99
1 files changed, 65 insertions, 34 deletions
diff --git a/drivers/acpi/x86/s2idle.c b/drivers/acpi/x86/s2idle.c
index ce62e61a9605..08f7c6708206 100644
--- a/drivers/acpi/x86/s2idle.c
+++ b/drivers/acpi/x86/s2idle.c
@@ -94,6 +94,11 @@ static struct lpi_constraints *lpi_constraints_table;
static int lpi_constraints_table_size;
static int rev_id;
+#define for_each_lpi_constraint(entry) \
+ for (int i = 0; \
+ entry = &lpi_constraints_table[i], i < lpi_constraints_table_size; \
+ i++)
+
static void lpi_device_get_constraints_amd(void)
{
union acpi_object *out_obj;
@@ -113,6 +118,12 @@ static void lpi_device_get_constraints_amd(void)
union acpi_object *package = &out_obj->package.elements[i];
if (package->type == ACPI_TYPE_PACKAGE) {
+ if (lpi_constraints_table) {
+ acpi_handle_err(lps0_device_handle,
+ "Duplicate constraints list\n");
+ goto free_acpi_buffer;
+ }
+
lpi_constraints_table = kcalloc(package->package.count,
sizeof(*lpi_constraints_table),
GFP_KERNEL);
@@ -123,17 +134,16 @@ static void lpi_device_get_constraints_amd(void)
acpi_handle_debug(lps0_device_handle,
"LPI: constraints list begin:\n");
- for (j = 0; j < package->package.count; ++j) {
+ for (j = 0; j < package->package.count; j++) {
union acpi_object *info_obj = &package->package.elements[j];
struct lpi_device_constraint_amd dev_info = {};
struct lpi_constraints *list;
acpi_status status;
- for (k = 0; k < info_obj->package.count; ++k) {
- union acpi_object *obj = &info_obj->package.elements[k];
+ list = &lpi_constraints_table[lpi_constraints_table_size];
- list = &lpi_constraints_table[lpi_constraints_table_size];
- list->min_dstate = -1;
+ for (k = 0; k < info_obj->package.count; k++) {
+ union acpi_object *obj = &info_obj->package.elements[k];
switch (k) {
case 0:
@@ -149,27 +159,25 @@ static void lpi_device_get_constraints_amd(void)
dev_info.min_dstate = obj->integer.value;
break;
}
+ }
- if (!dev_info.enabled || !dev_info.name ||
- !dev_info.min_dstate)
- continue;
+ acpi_handle_debug(lps0_device_handle,
+ "Name:%s, Enabled: %d, States: %d, MinDstate: %d\n",
+ dev_info.name,
+ dev_info.enabled,
+ dev_info.function_states,
+ dev_info.min_dstate);
- status = acpi_get_handle(NULL, dev_info.name,
- &list->handle);
- if (ACPI_FAILURE(status))
- continue;
+ if (!dev_info.enabled || !dev_info.name ||
+ !dev_info.min_dstate)
+ continue;
- acpi_handle_debug(lps0_device_handle,
- "Name:%s\n", dev_info.name);
+ status = acpi_get_handle(NULL, dev_info.name, &list->handle);
+ if (ACPI_FAILURE(status))
+ continue;
- list->min_dstate = dev_info.min_dstate;
+ list->min_dstate = dev_info.min_dstate;
- if (list->min_dstate < 0) {
- acpi_handle_debug(lps0_device_handle,
- "Incomplete constraint defined\n");
- continue;
- }
- }
lpi_constraints_table_size++;
}
}
@@ -214,7 +222,7 @@ static void lpi_device_get_constraints(void)
if (!package)
continue;
- for (j = 0; j < package->package.count; ++j) {
+ for (j = 0; j < package->package.count; j++) {
union acpi_object *element =
&(package->package.elements[j]);
@@ -246,7 +254,7 @@ static void lpi_device_get_constraints(void)
constraint->min_dstate = -1;
- for (j = 0; j < package_count; ++j) {
+ for (j = 0; j < package_count; j++) {
union acpi_object *info_obj = &info.package[j];
union acpi_object *cnstr_pkg;
union acpi_object *obj;
@@ -291,32 +299,55 @@ free_acpi_buffer:
ACPI_FREE(out_obj);
}
+/**
+ * acpi_get_lps0_constraint - Get the LPS0 constraint for a device.
+ * @adev: Device to get the constraint for.
+ *
+ * The LPS0 constraint is the shallowest (minimum) power state in which the
+ * device can be so as to allow the platform as a whole to achieve additional
+ * energy conservation by utilizing a system-wide low-power state.
+ *
+ * Returns:
+ * - ACPI power state value of the constraint for @adev on success.
+ * - Otherwise, ACPI_STATE_UNKNOWN.
+ */
+int acpi_get_lps0_constraint(struct acpi_device *adev)
+{
+ struct lpi_constraints *entry;
+
+ for_each_lpi_constraint(entry) {
+ if (adev->handle == entry->handle)
+ return entry->min_dstate;
+ }
+
+ return ACPI_STATE_UNKNOWN;
+}
+
static void lpi_check_constraints(void)
{
- int i;
+ struct lpi_constraints *entry;
- for (i = 0; i < lpi_constraints_table_size; ++i) {
- acpi_handle handle = lpi_constraints_table[i].handle;
- struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
+ for_each_lpi_constraint(entry) {
+ struct acpi_device *adev = acpi_fetch_acpi_dev(entry->handle);
if (!adev)
continue;
- acpi_handle_debug(handle,
+ acpi_handle_debug(entry->handle,
"LPI: required min power state:%s current power state:%s\n",
- acpi_power_state_string(lpi_constraints_table[i].min_dstate),
+ acpi_power_state_string(entry->min_dstate),
acpi_power_state_string(adev->power.state));
if (!adev->flags.power_manageable) {
- acpi_handle_info(handle, "LPI: Device not power manageable\n");
- lpi_constraints_table[i].handle = NULL;
+ acpi_handle_info(entry->handle, "LPI: Device not power manageable\n");
+ entry->handle = NULL;
continue;
}
- if (adev->power.state < lpi_constraints_table[i].min_dstate)
- acpi_handle_info(handle,
+ if (adev->power.state < entry->min_dstate)
+ acpi_handle_info(entry->handle,
"LPI: Constraint not met; min power state:%s current power state:%s\n",
- acpi_power_state_string(lpi_constraints_table[i].min_dstate),
+ acpi_power_state_string(entry->min_dstate),
acpi_power_state_string(adev->power.state));
}
}