arch/x86/amd_hsmp.rst

1 .. SPDX-License-Identifier: GPL-2.0
7 Newer Fam19h(model 0x00-0x1f, 0x30-0x3f, 0x90-0x9f, 0xa0-0xaf),
8 Fam1Ah(model 0x00-0x1f) EPYC server line of processors from AMD support
12 OS-level software with access to system management functions via a
17 Eg: https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/programmer-references/5589…
40 $ ls -al /dev/hsmp
41 crw-r--r-- 1 root root 10, 123 Jan 21 21:41 /dev/hsmp
44  * Write mode is used for running set/configure commands
45  * Read mode is used for running get/status monitor commands
48  * Only root user is allowed to open the file in write mode.
49  * The file can be opened in read mode by all the users.
51 In-kernel integration:
103 			Name(_DSD, Package(2)
110 				Package(3)
112 					Package(2) {"MsgIdOffset", 0x00010934},
113 					Package(2) {"MsgRspOffset", 0x00010980},
114 					Package(2) {"MsgArgOffset", 0x000109E0}
153 The ioctl would return a non-zero on failure; you can read errno to see
158 eg: https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/programmer-references/5589…
160 User space C-APIs are made available by linking against the esmi library,
161 which is provided by the E-SMS project https://www.amd.com/en/developer/e-sms.html.