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acpi: Add an interface to obtain DSM information

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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
This commit is contained in:
Ben Widawsky 2018-10-22 03:29:54 +00:00
parent 8f59bec209
commit 8fd1088042
2 changed files with 96 additions and 0 deletions
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92
sys/dev/acpica/acpi.c
View File

@ -2570,6 +2570,98 @@ acpi_AppendBufferResource(ACPI_BUFFER *buf, ACPI_RESOURCE *res)
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)

4
sys/dev/acpica/acpivar.h
View File

@ -349,6 +349,10 @@ ACPI_STATUS acpi_FindIndexedResource(ACPI_BUFFER *buf, int index,
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);