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hw/cxl: Add QTG _DSM support for ACPI0017 device
Add a simple _DSM call support for the ACPI0017 device to return fake QTG ID values of 0 and 1 in all cases. This for _DSM plumbing testing from the OS. Following edited for readability Device (CXLM) { Name (_HID, "ACPI0017") // _HID: Hardware ID ... Method (_DSM, 4, Serialized) // _DSM: Device-Specific Method { If ((Arg0 == ToUUID ("f365f9a6-a7de-4071-a66a-b40c0b4f8e52"))) { If ((Arg2 == Zero)) { Return (Buffer (One) { 0x01 }) } If ((Arg2 == One)) { Return (Package (0x02) { One, Package (0x02) { Zero, One } }) } } } Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Message-Id: <20231012125623.21101-3-Jonathan.Cameron@huawei.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -30,6 +30,75 @@
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#include "qapi/error.h"
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#include "qapi/error.h"
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#include "qemu/uuid.h"
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#include "qemu/uuid.h"
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void build_cxl_dsm_method(Aml *dev)
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{
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Aml *method, *ifctx, *ifctx2;
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method = aml_method("_DSM", 4, AML_SERIALIZED);
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{
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Aml *function, *uuid;
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uuid = aml_arg(0);
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function = aml_arg(2);
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/* CXL spec v3.0 9.17.3.1 _DSM Function for Retrieving QTG ID */
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ifctx = aml_if(aml_equal(
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uuid, aml_touuid("F365F9A6-A7DE-4071-A66A-B40C0B4F8E52")));
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/* Function 0, standard DSM query function */
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ifctx2 = aml_if(aml_equal(function, aml_int(0)));
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{
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uint8_t byte_list[1] = { 0x01 }; /* function 1 only */
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aml_append(ifctx2,
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aml_return(aml_buffer(sizeof(byte_list), byte_list)));
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}
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aml_append(ifctx, ifctx2);
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/*
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* Function 1
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* Creating a package with static values. The max supported QTG ID will
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* be 1 and recommended QTG IDs are 0 and then 1.
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* The values here are statically created to simplify emulation. Values
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* from a real BIOS would be determined by the performance of all the
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* present CXL memory and then assigned.
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*/
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ifctx2 = aml_if(aml_equal(function, aml_int(1)));
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{
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Aml *pak, *pak1;
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/*
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* Return: A package containing two elements - a WORD that returns
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* the maximum throttling group that the platform supports, and a
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* package containing the QTG ID(s) that the platform recommends.
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* Package {
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* Max Supported QTG ID
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* Package {QTG Recommendations}
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* }
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*
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* While the SPEC specified WORD that hints at the value being
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* 16bit, the ACPI dump of BIOS DSDT table showed that the values
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* are integers with no specific size specification. aml_int() will
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* be used for the values.
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*/
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pak1 = aml_package(2);
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/* Set QTG ID of 0 */
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aml_append(pak1, aml_int(0));
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/* Set QTG ID of 1 */
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aml_append(pak1, aml_int(1));
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pak = aml_package(2);
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/* Set Max QTG 1 */
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aml_append(pak, aml_int(1));
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aml_append(pak, pak1);
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aml_append(ifctx2, aml_return(pak));
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}
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aml_append(ifctx, ifctx2);
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}
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aml_append(method, ifctx);
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aml_append(dev, method);
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}
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static void cedt_build_chbs(GArray *table_data, PXBCXLDev *cxl)
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static void cedt_build_chbs(GArray *table_data, PXBCXLDev *cxl)
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{
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{
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PXBDev *pxb = PXB_DEV(cxl);
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PXBDev *pxb = PXB_DEV(cxl);
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@ -1417,6 +1417,7 @@ static void build_acpi0017(Aml *table)
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method = aml_method("_STA", 0, AML_NOTSERIALIZED);
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method = aml_method("_STA", 0, AML_NOTSERIALIZED);
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aml_append(method, aml_return(aml_int(0x01)));
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aml_append(method, aml_return(aml_int(0x01)));
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aml_append(dev, method);
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aml_append(dev, method);
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build_cxl_dsm_method(dev);
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aml_append(scope, dev);
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aml_append(scope, dev);
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aml_append(table, scope);
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aml_append(table, scope);
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@ -25,5 +25,6 @@ void cxl_build_cedt(GArray *table_offsets, GArray *table_data,
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BIOSLinker *linker, const char *oem_id,
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BIOSLinker *linker, const char *oem_id,
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const char *oem_table_id, CXLState *cxl_state);
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const char *oem_table_id, CXLState *cxl_state);
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void build_cxl_osc_method(Aml *dev);
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void build_cxl_osc_method(Aml *dev);
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void build_cxl_dsm_method(Aml *dev);
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#endif
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#endif
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