svn commit: r336185 - head/usr.sbin/acpi/acpidump

[Ben Widawsky]

Author: bwidawsk
Date: Wed Jul 11 01:37:01 2018
New Revision: 336185
URL: https://svnweb.freebsd.org/changeset/base/336185

Log:
  acpidump(8): Add ACPI LPIT (Low Power Idle Table)
  
  The LPIT is the part of the "standardized" way that one can enumerate
  various power state information on Intel platforms.
  
  The documentation for this change can be found here:
  http://www.uefi.org/sites/default/files/resources/Intel_ACPI_Low_Power_S0_Idle.pdf
  
  Reviewed By: jhb
  Approved By: jhb
  Differential Revision: https://reviews.freebsd.org/D15931

Modified:
  head/usr.sbin/acpi/acpidump/acpi.c
  head/usr.sbin/acpi/acpidump/acpidump.8

Modified: head/usr.sbin/acpi/acpidump/acpi.c
==============================================================================
--- head/usr.sbin/acpi/acpidump/acpi.c	Tue Jul 10 23:30:19 2018	(r336184)
+++ head/usr.sbin/acpi/acpidump/acpi.c	Wed Jul 11 01:37:01 2018	(r336185)
@@ -68,6 +68,7 @@ static void	acpi_handle_hpet(ACPI_TABLE_HEADER *sdp);
 static void	acpi_handle_mcfg(ACPI_TABLE_HEADER *sdp);
 static void	acpi_handle_slit(ACPI_TABLE_HEADER *sdp);
 static void	acpi_handle_wddt(ACPI_TABLE_HEADER *sdp);
+static void	acpi_handle_lpit(ACPI_TABLE_HEADER *sdp);
 static void	acpi_print_srat_cpu(uint32_t apic_id, uint32_t proximity_domain,
 		    uint32_t flags);
 static void	acpi_print_srat_memory(ACPI_SRAT_MEM_AFFINITY *mp);
@@ -716,6 +717,79 @@ acpi_handle_wddt(ACPI_TABLE_HEADER *sdp)
 }
 
 static void
+acpi_print_native_lpit(ACPI_LPIT_NATIVE *nl)
+{
+	printf("\tEntryTrigger=");
+	acpi_print_gas(&nl->EntryTrigger);
+	printf("\tResidency=%u\n", nl->Residency);
+	printf("\tLatency=%u\n", nl->Latency);
+	if (nl->Header.Flags & ACPI_LPIT_NO_COUNTER)
+		printf("\tResidencyCounter=Not Present");
+	else {
+		printf("\tResidencyCounter=");
+		acpi_print_gas(&nl->ResidencyCounter);
+	}
+	if (nl->CounterFrequency)
+		printf("\tCounterFrequency=%ju\n", nl->CounterFrequency);
+	else
+		printf("\tCounterFrequency=TSC\n");
+}
+
+static void
+acpi_print_lpit(ACPI_LPIT_HEADER *lpit)
+{
+	if (lpit->Type == ACPI_LPIT_TYPE_NATIVE_CSTATE)
+		printf("\tType=ACPI_LPIT_TYPE_NATIVE_CSTATE\n");
+	else
+		warnx("unknown LPIT type %u", lpit->Type);
+
+	printf("\tLength=%u\n", lpit->Length);
+	printf("\tUniqueId=0x%04x\n", lpit->UniqueId);
+#define	PRINTFLAG(var, flag)	printflag((var), ACPI_LPIT_## flag, #flag)
+	printf("\tFlags=");
+	PRINTFLAG(lpit->Flags, STATE_DISABLED);
+	PRINTFLAG_END();
+#undef PRINTFLAG
+
+	if (lpit->Type == ACPI_LPIT_TYPE_NATIVE_CSTATE)
+		return acpi_print_native_lpit((ACPI_LPIT_NATIVE *)lpit);
+}
+
+static void
+acpi_walk_lpit(ACPI_TABLE_HEADER *table, void *first,
+    void (*action)(ACPI_LPIT_HEADER *))
+{
+	ACPI_LPIT_HEADER *subtable;
+	char *end;
+
+	subtable = first;
+	end = (char *)table + table->Length;
+	while ((char *)subtable < end) {
+		printf("\n");
+		if (subtable->Length < sizeof(ACPI_LPIT_HEADER)) {
+			warnx("invalid subtable length %u", subtable->Length);
+			return;
+		}
+		action(subtable);
+		subtable = (ACPI_LPIT_HEADER *)((char *)subtable +
+		    subtable->Length);
+	}
+}
+
+static void
+acpi_handle_lpit(ACPI_TABLE_HEADER *sdp)
+{
+	ACPI_TABLE_LPIT *lpit;
+
+	printf(BEGIN_COMMENT);
+	acpi_print_sdt(sdp);
+	lpit = (ACPI_TABLE_LPIT *)sdp;
+	acpi_walk_lpit(sdp, (lpit + 1), acpi_print_lpit);
+
+	printf(END_COMMENT);
+}
+
+static void
 acpi_print_srat_cpu(uint32_t apic_id, uint32_t proximity_domain,
     uint32_t flags)
 {
@@ -1693,6 +1767,8 @@ acpi_handle_rsdt(ACPI_TABLE_HEADER *rsdp)
 			acpi_handle_nfit(sdp);
 		else if (!memcmp(sdp->Signature, ACPI_SIG_WDDT, 4))
 			acpi_handle_wddt(sdp);
+		else if (!memcmp(sdp->Signature, ACPI_SIG_LPIT, 4))
+			acpi_handle_lpit(sdp);
 		else {
 			printf(BEGIN_COMMENT);
 			acpi_print_sdt(sdp);

Modified: head/usr.sbin/acpi/acpidump/acpidump.8
==============================================================================
--- head/usr.sbin/acpi/acpidump/acpidump.8	Tue Jul 10 23:30:19 2018	(r336184)
+++ head/usr.sbin/acpi/acpidump/acpidump.8	Wed Jul 11 01:37:01 2018	(r336185)
@@ -29,7 +29,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd June 20, 2018
+.Dd July 10, 2018
 .Dt ACPIDUMP 8
 .Os
 .Sh NAME
@@ -103,6 +103,7 @@ utility dumps contents of the following tables:
 .It FACS
 .It FADT
 .It HPET
+.It LPIT
 .It MADT
 .It MCFG
 .It NFIT