Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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33 lines
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.. SPDX-License-Identifier: GPL-2.0
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===========================================
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HMAT - Heterogeneous Memory Attribute Table
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===========================================
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The Heterogeneous Memory Attributes Table contains information such as cache
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attributes and bandwidth and latency details for memory proximity domains.
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For the purpose of this document, we will only discuss the SSLIB entry.
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SLLBI
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=====
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The System Locality Latency and Bandwidth Information records latency and
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bandwidth information for proximity domains.
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This table is used by Linux to configure interleave weights and memory tiers.
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Example (Heavily truncated for brevity) ::
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Structure Type : 0001 [SLLBI]
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Data Type : 00 <- Latency
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Target Proximity Domain List : 00000000
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Target Proximity Domain List : 00000001
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Entry : 0080 <- DRAM LTC
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Entry : 0100 <- CXL LTC
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Structure Type : 0001 [SLLBI]
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Data Type : 03 <- Bandwidth
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Target Proximity Domain List : 00000000
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Target Proximity Domain List : 00000001
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Entry : 1200 <- DRAM BW
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Entry : 0200 <- CXL BW
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