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diff --git a/Documentation/driver-api/cxl/platform/acpi/hmat.rst b/Documentation/driver-api/cxl/platform/acpi/hmat.rst new file mode 100644 index 000000000000..095a26f02a37 --- /dev/null +++ b/Documentation/driver-api/cxl/platform/acpi/hmat.rst @@ -0,0 +1,32 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=========================================== +HMAT - Heterogeneous Memory Attribute Table +=========================================== + +The Heterogeneous Memory Attributes Table contains information such as cache +attributes and bandwidth and latency details for memory proximity domains. +For the purpose of this document, we will only discuss the SSLIB entry. + +SLLBI +===== +The System Locality Latency and Bandwidth Information records latency and +bandwidth information for proximity domains. + +This table is used by Linux to configure interleave weights and memory tiers. + +Example (Heavily truncated for brevity) :: + + Structure Type : 0001 [SLLBI] + Data Type : 00 <- Latency + Target Proximity Domain List : 00000000 + Target Proximity Domain List : 00000001 + Entry : 0080 <- DRAM LTC + Entry : 0100 <- CXL LTC + + Structure Type : 0001 [SLLBI] + Data Type : 03 <- Bandwidth + Target Proximity Domain List : 00000000 + Target Proximity Domain List : 00000001 + Entry : 1200 <- DRAM BW + Entry : 0200 <- CXL BW |