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HMAT is defined in ACPI 6.3: 5.2.27 Heterogeneous Memory Attribute Table (HMAT). The specification references below link: http://www.uefi.org/sites/default/files/resources/ACPI_6_3_final_Jan30.pdf It describes the memory attributes, such as memory side cache attributes and bandwidth and latency details, related to the Memory Proximity Domain. The software is expected to use this information as hint for optimization. This structure describes Memory Proximity Domain Attributes by memory subsystem and its associativity with processor proximity domain as well as hint for memory usage. In the linux kernel, the codes in drivers/acpi/hmat/hmat.c parse and report the platform's HMAT tables. Acked-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Daniel Black <daniel@linux.ibm.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Liu Jingqi <jingqi.liu@intel.com> Signed-off-by: Tao Xu <tao3.xu@intel.com> Message-Id: <20191213011929.2520-5-tao3.xu@intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/*
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* HMAT ACPI Implementation Header
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*
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* Copyright(C) 2019 Intel Corporation.
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*
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* Author:
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* Liu jingqi <jingqi.liu@linux.intel.com>
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* Tao Xu <tao3.xu@intel.com>
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*
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* HMAT is defined in ACPI 6.3: 5.2.27 Heterogeneous Memory Attribute Table
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* (HMAT)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>
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*/
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#ifndef HMAT_H
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#define HMAT_H
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#include "hw/acpi/aml-build.h"
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/*
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* ACPI 6.3: 5.2.27.3 Memory Proximity Domain Attributes Structure,
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* Table 5-145, Field "flag", Bit [0]: set to 1 to indicate that data in
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* the Proximity Domain for the Attached Initiator field is valid.
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* Other bits reserved.
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*/
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#define HMAT_PROXIMITY_INITIATOR_VALID 0x1
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void build_hmat(GArray *table_data, BIOSLinker *linker, NumaState *numa_state);
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#endif
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