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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_MWAIT_H #define _ASM_X86_MWAIT_H #include <linux/sched.h> #include <linux/sched/idle.h> #include <asm/cpufeature.h> #include <asm/nospec-branch.h> #define MWAIT_SUBSTATE_MASK 0xf #define MWAIT_CSTATE_MASK 0xf #define MWAIT_SUBSTATE_SIZE 4 #define MWAIT_HINT2CSTATE(hint) (((hint) >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) #define MWAIT_HINT2SUBSTATE(hint) ((hint) & MWAIT_CSTATE_MASK) #define CPUID_MWAIT_LEAF 5 #define CPUID5_ECX_EXTENSIONS_SUPPORTED 0x1 #define CPUID5_ECX_INTERRUPT_BREAK 0x2 #define MWAIT_ECX_INTERRUPT_BREAK 0x1 #define MWAITX_ECX_TIMER_ENABLE BIT(1) #define MWAITX_MAX_LOOPS ((u32)-1) #define MWAITX_DISABLE_CSTATES 0xf0 static inline void __monitor(const void *eax, unsigned long ecx, unsigned long edx) { /* "monitor %eax, %ecx, %edx;" */ asm volatile(".byte 0x0f, 0x01, 0xc8;" :: "a" (eax), "c" (ecx), "d"(edx)); } static inline void __monitorx(const void *eax, unsigned long ecx, unsigned long edx) { /* "monitorx %eax, %ecx, %edx;" */ asm volatile(".byte 0x0f, 0x01, 0xfa;" :: "a" (eax), "c" (ecx), "d"(edx)); } static inline void __mwait(unsigned long eax, unsigned long ecx) { mds_idle_clear_cpu_buffers(); /* "mwait %eax, %ecx;" */ asm volatile(".byte 0x0f, 0x01, 0xc9;" :: "a" (eax), "c" (ecx)); } /* * MWAITX allows for a timer expiration to get the core out a wait state in * addition to the default MWAIT exit condition of a store appearing at a * monitored virtual address. * * Registers: * * MWAITX ECX[1]: enable timer if set * MWAITX EBX[31:0]: max wait time expressed in SW P0 clocks. The software P0 * frequency is the same as the TSC frequency. * * Below is a comparison between MWAIT and MWAITX on AMD processors: * * MWAIT MWAITX * opcode 0f 01 c9 | 0f 01 fb * ECX[0] value of RFLAGS.IF seen by instruction * ECX[1] unused/#GP if set | enable timer if set * ECX[31:2] unused/#GP if set * EAX unused (reserve for hint) * EBX[31:0] unused | max wait time (P0 clocks) * * MONITOR MONITORX * opcode 0f 01 c8 | 0f 01 fa * EAX (logical) address to monitor * ECX #GP if not zero */ static inline void __mwaitx(unsigned long eax, unsigned long ebx, unsigned long ecx) { /* No MDS buffer clear as this is AMD/HYGON only */ /* "mwaitx %eax, %ebx, %ecx;" */ asm volatile(".byte 0x0f, 0x01, 0xfb;" :: "a" (eax), "b" (ebx), "c" (ecx)); } static inline void __sti_mwait(unsigned long eax, unsigned long ecx) { trace_hardirqs_on(); mds_idle_clear_cpu_buffers(); /* "mwait %eax, %ecx;" */ asm volatile("sti; .byte 0x0f, 0x01, 0xc9;" :: "a" (eax), "c" (ecx)); } /* * This uses new MONITOR/MWAIT instructions on P4 processors with PNI, * which can obviate IPI to trigger checking of need_resched. * We execute MONITOR against need_resched and enter optimized wait state * through MWAIT. Whenever someone changes need_resched, we would be woken * up from MWAIT (without an IPI). * * New with Core Duo processors, MWAIT can take some hints based on CPU * capability. */ static inline void mwait_idle_with_hints(unsigned long eax, unsigned long ecx) { if (static_cpu_has_bug(X86_BUG_MONITOR) || !current_set_polling_and_test()) { if (static_cpu_has_bug(X86_BUG_CLFLUSH_MONITOR)) { mb(); clflush((void *)¤t_thread_info()->flags); mb(); } __monitor((void *)¤t_thread_info()->flags, 0, 0); if (!need_resched()) __mwait(eax, ecx); } current_clr_polling(); } #endif /* _ASM_X86_MWAIT_H */
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