Messages in this thread | | | From | Fenghua Yu <> | Subject | [RFC PATCH 0/8] x86: Enable a few new instructions | Date | Fri, 15 Jun 2018 20:06:07 -0700 |
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A few new instructions including direct stores (movdiri and movdir64b) and user wait (umwait, umonitor, and tpause) and IA32_MWAIT_CONTROL MSR to control umwait/umonitor/tpause behaviors will be available in Tremont and other future x86 processors.
This patch set enumerates the instructions, adds a sysfs interface for user to configure the umwait/umonitor/tpause instructions, and provides APIs for user or kernel to call the instructions.
The sysfs interface files are in /sys/devices/system/cpu/user_wait because it's hard to find existing place to host the files.
The user libraries for the instructions are in arch/x86/include/uapi/asm/. Hopefully this is a right place to keep the libraries.
Detailed information on the instructions and the MSR can be found in the latest Intel Architecture Instruction Set Extensions and Future Features Programming Reference at https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf
Fenghua Yu (8): x86/cpufeatures: Enumerate MOVDIRI instruction x86/cpufeatures: Enumerate MOVDIR64B instruction x86/cpufeatures: Enumerate UMONITOR, UMWAIT, and TPAUSE instructions cpuidle: Set up maximum umwait time and umwait states x86/umwait.c: Add sysfs interface to show tsc_khz x86/lib_direct_store.h: Add APIs for direct store instructions x86/lib_user_wait.h: Add APIs for user wait instructions selftests/x86: Self test for the APIs in lib_direct_store.h and lib_user_wait.h
arch/x86/include/asm/cpufeatures.h | 3 + arch/x86/include/asm/msr-index.h | 4 + arch/x86/include/uapi/asm/lib_direct_store.h | 161 ++++++++++++++ arch/x86/include/uapi/asm/lib_user_wait.h | 255 +++++++++++++++++++++++ arch/x86/power/Makefile | 1 + arch/x86/power/umwait.c | 123 +++++++++++ tools/testing/selftests/x86/Makefile | 5 +- tools/testing/selftests/x86/directstore_umwait.c | 202 ++++++++++++++++++ 8 files changed, 752 insertions(+), 2 deletions(-) create mode 100644 arch/x86/include/uapi/asm/lib_direct_store.h create mode 100644 arch/x86/include/uapi/asm/lib_user_wait.h create mode 100644 arch/x86/power/umwait.c create mode 100644 tools/testing/selftests/x86/directstore_umwait.c
-- 2.5.0
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