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>

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;
 };

src/drivers/intel/dptf/dptf.c

@@ -41,6 +41,11 @@ static bool is_participant_used(const struct drivers_intel_dptf_config *config,
 		    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 @@ static void dptf_fill_ssdt(const struct device *dev)
 	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));
 }