svn commit: r339577 - head/sys/dev/acpica
Ben Widawsky
bwidawsk at FreeBSD.org
Mon Oct 22 03:29:55 UTC 2018
Author: bwidawsk
Date: Mon Oct 22 03:29:54 2018
New Revision: 339577
URL: https://svnweb.freebsd.org/changeset/base/339577
Log:
acpi: Add an interface to obtain DSM information
The Device Specific Method (_DSM) is on optional object that defines
device specific controls. This will be useful for our power management
controller in upcoming patches. More information can be found in ACPI
spec 6.2 section 9.1.1
https://www.uefi.org/sites/default/files/resources/ACPI_6_2.pdf
This patch had a minor modification changing ENOMEM to AE_NO_MEMORY
after it got review and approval but before committing.
Test Plan: Tested in my s0ix branch
Reviewed by: kib
Approved by: emaste (mentor)
Differential Revision: https://reviews.freebsd.org/D17121
Modified:
head/sys/dev/acpica/acpi.c
head/sys/dev/acpica/acpivar.h
Modified: head/sys/dev/acpica/acpi.c
==============================================================================
--- head/sys/dev/acpica/acpi.c Mon Oct 22 02:42:14 2018 (r339576)
+++ head/sys/dev/acpica/acpi.c Mon Oct 22 03:29:54 2018 (r339577)
@@ -2570,6 +2570,98 @@ acpi_AppendBufferResource(ACPI_BUFFER *buf, ACPI_RESOU
return (AE_OK);
}
+UINT8
+acpi_DSMQuery(ACPI_HANDLE h, uint8_t *uuid, int revision)
+{
+ /*
+ * ACPI spec 9.1.1 defines this.
+ *
+ * "Arg2: Function Index Represents a specific function whose meaning is
+ * specific to the UUID and Revision ID. Function indices should start
+ * with 1. Function number zero is a query function (see the special
+ * return code defined below)."
+ */
+ ACPI_BUFFER buf;
+ ACPI_OBJECT *obj;
+ UINT8 ret = 0;
+
+ if (!ACPI_SUCCESS(acpi_EvaluateDSM(h, uuid, revision, 0, NULL, &buf))) {
+ ACPI_INFO(("Failed to enumerate DSM functions\n"));
+ return (0);
+ }
+
+ obj = (ACPI_OBJECT *)buf.Pointer;
+ KASSERT(obj, ("Object not allowed to be NULL\n"));
+
+ /*
+ * From ACPI 6.2 spec 9.1.1:
+ * If Function Index = 0, a Buffer containing a function index bitfield.
+ * Otherwise, the return value and type depends on the UUID and revision
+ * ID (see below).
+ */
+ switch (obj->Type) {
+ case ACPI_TYPE_BUFFER:
+ ret = *(uint8_t *)obj->Buffer.Pointer;
+ break;
+ case ACPI_TYPE_INTEGER:
+ ACPI_BIOS_WARNING((AE_INFO,
+ "Possibly buggy BIOS with ACPI_TYPE_INTEGER for function enumeration\n"));
+ ret = obj->Integer.Value & 0xFF;
+ break;
+ default:
+ ACPI_WARNING((AE_INFO, "Unexpected return type %u\n", obj->Type));
+ };
+
+ AcpiOsFree(obj);
+ return ret;
+}
+
+/*
+ * DSM may return multiple types depending on the function. It is therefore
+ * unsafe to use the typed evaluation. It is highly recommended that the caller
+ * check the type of the returned object.
+ */
+ACPI_STATUS
+acpi_EvaluateDSM(ACPI_HANDLE handle, uint8_t *uuid, int revision,
+ uint64_t function, union acpi_object *package, ACPI_BUFFER *out_buf)
+{
+ ACPI_OBJECT arg[4];
+ ACPI_OBJECT_LIST arglist;
+ ACPI_BUFFER buf;
+ ACPI_STATUS status;
+
+ if (out_buf == NULL)
+ return (AE_NO_MEMORY);
+
+ arg[0].Type = ACPI_TYPE_BUFFER;
+ arg[0].Buffer.Length = ACPI_UUID_LENGTH;
+ arg[0].Buffer.Pointer = uuid;
+ arg[1].Type = ACPI_TYPE_INTEGER;
+ arg[1].Integer.Value = revision;
+ arg[2].Type = ACPI_TYPE_INTEGER;
+ arg[2].Integer.Value = function;
+ if (package) {
+ arg[3] = *package;
+ } else {
+ arg[3].Type = ACPI_TYPE_PACKAGE;
+ arg[3].Package.Count = 0;
+ arg[3].Package.Elements = NULL;
+ }
+
+ arglist.Pointer = arg;
+ arglist.Count = 4;
+ buf.Pointer = NULL;
+ buf.Length = ACPI_ALLOCATE_BUFFER;
+ status = AcpiEvaluateObject(handle, "_DSM", &arglist, &buf);
+ if (ACPI_FAILURE(status))
+ return (status);
+
+ KASSERT(ACPI_SUCCESS(status), ("Unexpected status"));
+
+ *out_buf = buf;
+ return (status);
+}
+
ACPI_STATUS
acpi_EvaluateOSC(ACPI_HANDLE handle, uint8_t *uuid, int revision, int count,
uint32_t *caps_in, uint32_t *caps_out, bool query)
Modified: head/sys/dev/acpica/acpivar.h
==============================================================================
--- head/sys/dev/acpica/acpivar.h Mon Oct 22 02:42:14 2018 (r339576)
+++ head/sys/dev/acpica/acpivar.h Mon Oct 22 03:29:54 2018 (r339577)
@@ -349,6 +349,10 @@ ACPI_STATUS acpi_FindIndexedResource(ACPI_BUFFER *buf,
ACPI_RESOURCE **resp);
ACPI_STATUS acpi_AppendBufferResource(ACPI_BUFFER *buf,
ACPI_RESOURCE *res);
+UINT8 acpi_DSMQuery(ACPI_HANDLE h, uint8_t *uuid, int revision);
+ACPI_STATUS acpi_EvaluateDSM(ACPI_HANDLE handle, uint8_t *uuid,
+ int revision, uint64_t function, union acpi_object *package,
+ ACPI_BUFFER *out_buf);
ACPI_STATUS acpi_EvaluateOSC(ACPI_HANDLE handle, uint8_t *uuid,
int revision, int count, uint32_t *caps_in,
uint32_t *caps_out, bool query);
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