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AMD systems support the Monitor/Mwait instructions and these can be used for ACPI C1 in the same way as on Intel systems. Three things are needed: 1) This patch. 2) BIOS that declares a C1 state in _CST to use FFH, with correct values. 3) CPUID_Fn00000005_EDX is non-zero on the system. The BIOS on AMD systems have historically not defined a C1 state in _CST, so the acpi_idle driver uses HALT for ACPI C1. Currently released systems have CPUID_Fn00000005_EDX as reserved/RAZ. If a BIOS is released for these systems that requests a C1 state with FFH, the FFH implementation in Linux will fail since CPUID_Fn00000005_EDX is 0. The acpi_idle driver will then fallback to using HALT for ACPI C1. Future systems are expected to have non-zero CPUID_Fn00000005_EDX and BIOS support for using FFH for ACPI C1. Allow ffh_cstate_init() to succeed on AMD systems. Tested on Fam15h and Fam17h systems. Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com> Acked-by: Borislav Petkov <bp@suse.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.