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acpidump(8): Add ACPI LPIT (Low Power Idle Table)

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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
This commit is contained in:
Ben Widawsky 2018-07-11 01:37:01 +00:00
parent a84a458c6f
commit 5857fba5fd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=336185
2 changed files with 78 additions and 1 deletions
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76
usr.sbin/acpi/acpidump/acpi.c
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@ -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);
@ -715,6 +716,79 @@ acpi_handle_wddt(ACPI_TABLE_HEADER *sdp)
printf(END_COMMENT);
}
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);

3
usr.sbin/acpi/acpidump/acpidump.8
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@ -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