dptf: Add support for Critical Policies
This patch adds support for DPTF Critical Policies, which are consist
of Method definitions only. They are `_CRT` and `_HOT`, which are
defined as temperature thresholds that, when exceeded, will execute a
graceful suspend or a graceful shutdown, respectively.
BUG=b:143539650
TEST=compiles
Change-Id: I711ecdcf17ae8f6e653f33069201da4515ace85e
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41887
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
diff --git a/src/acpi/acpigen_dptf.c b/src/acpi/acpigen_dptf.c
index abd99c1..88cf386 100644
--- a/src/acpi/acpigen_dptf.c
+++ b/src/acpi/acpigen_dptf.c
@@ -262,3 +262,21 @@
write_thermal_relationship_table(policies, max_count);
write_all_PSV(policies, max_count);
}
+
+void dptf_write_critical_policies(const struct dptf_critical_policy *policies, int max_count)
+{
+ int i;
+
+ for (i = 0; i < max_count; ++i) {
+ if (policies[i].source == DPTF_NONE)
+ break;
+
+ dptf_write_scope(policies[i].source);
+
+ /* Choose _CRT or _HOT */
+ write_simple_return_method(policies[i].type == DPTF_CRITICAL_SHUTDOWN ?
+ "_CRT" : "_HOT", to_acpi_temp(policies[i].temp));
+
+ acpigen_pop_len(); /* Scope */
+ }
+}
diff --git a/src/drivers/intel/dptf/chip.h b/src/drivers/intel/dptf/chip.h
index 0cd2ad2..8d77603 100644
--- a/src/drivers/intel/dptf/chip.h
+++ b/src/drivers/intel/dptf/chip.h
@@ -8,6 +8,7 @@
struct drivers_intel_dptf_config {
struct {
struct dptf_active_policy active[DPTF_MAX_ACTIVE_POLICIES];
+ struct dptf_critical_policy critical[DPTF_MAX_CRITICAL_POLICIES];
struct dptf_passive_policy passive[DPTF_MAX_PASSIVE_POLICIES];
} policies;
};
diff --git a/src/drivers/intel/dptf/dptf.c b/src/drivers/intel/dptf/dptf.c
index 74f4812..5cad07d 100644
--- a/src/drivers/intel/dptf/dptf.c
+++ b/src/drivers/intel/dptf/dptf.c
@@ -41,6 +41,11 @@
config->policies.passive[i].target == participant)
return true;
+ /* Critical? */
+ for (i = 0; i < DPTF_MAX_CRITICAL_POLICIES; ++i)
+ if (config->policies.critical[i].source == participant)
+ return true;
+
/* Check fan as well (its use is implicit in the Active policy) */
if (participant == DPTF_FAN && config->policies.active[0].target != DPTF_NONE)
return true;
@@ -64,6 +69,9 @@
dptf_write_passive_policies(config->policies.passive,
DPTF_MAX_PASSIVE_POLICIES);
+ dptf_write_critical_policies(config->policies.critical,
+ DPTF_MAX_CRITICAL_POLICIES);
+
printk(BIOS_INFO, "\\_SB.DPTF: %s at %s\n", dev->chip_ops->name, dev_path(dev));
}
diff --git a/src/include/acpi/acpigen_dptf.h b/src/include/acpi/acpigen_dptf.h
index 214578a..45fbe8f 100644
--- a/src/include/acpi/acpigen_dptf.h
+++ b/src/include/acpi/acpigen_dptf.h
@@ -28,6 +28,7 @@
DPTF_MAX_ACX = 10,
DPTF_MAX_ACTIVE_POLICIES = (DPTF_PARTICIPANT_COUNT-1),
DPTF_MAX_PASSIVE_POLICIES = (DPTF_PARTICIPANT_COUNT-1),
+ DPTF_MAX_CRITICAL_POLICIES = (DPTF_PARTICIPANT_COUNT-1),
};
/* Active Policy */
@@ -59,6 +60,22 @@
uint8_t priority;
};
+/* Critical Policy type: graceful S4 transition or graceful shutdown */
+enum dptf_critical_policy_type {
+ DPTF_CRITICAL_S4,
+ DPTF_CRITICAL_SHUTDOWN,
+};
+
+/* Critical Policy */
+struct dptf_critical_policy {
+ /* The device that can trigger a critical event */
+ enum dptf_participant source;
+ /* What type of critical policy */
+ enum dptf_critical_policy_type type;
+ /* Temperature to activate policy, degrees C */
+ uint8_t temp;
+};
+
/*
* This function provides tables of temperature and corresponding fan or percent. When the
* temperature thresholds are met (_AC0 - _AC9), the fan is driven to corresponding percentage
@@ -74,6 +91,13 @@
*/
void dptf_write_passive_policies(const struct dptf_passive_policy *policies, int max_count);
+/*
+ * Critical policies are temperature thresholds that, when reached, will cause the system to
+ * take some emergency action in order to eliminate excess temperatures from damaging the
+ * system. The emergency actions are a graceful suspend or a graceful shutdown.
+ */
+void dptf_write_critical_policies(const struct dptf_critical_policy *policies, int max_count);
+
/* Helper method to open the scope for a given participant. */
void dptf_write_scope(enum dptf_participant participant);