1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef _ASM_POWERPC_IDLE_H 3 #define _ASM_POWERPC_IDLE_H 4 #include <asm/runlatch.h> 5 #include <asm/paca.h> 6 7 #ifdef CONFIG_PPC_PSERIES 8 DECLARE_PER_CPU(u64, idle_spurr_cycles); 9 DECLARE_PER_CPU(u64, idle_entry_purr_snap); 10 DECLARE_PER_CPU(u64, idle_entry_spurr_snap); 11 12 static __always_inline void snapshot_purr_idle_entry(void) 13 { 14 *this_cpu_ptr(&idle_entry_purr_snap) = mfspr(SPRN_PURR); 15 } 16 17 static __always_inline void snapshot_spurr_idle_entry(void) 18 { 19 *this_cpu_ptr(&idle_entry_spurr_snap) = mfspr(SPRN_SPURR); 20 } 21 22 static __always_inline void update_idle_purr_accounting(void) 23 { 24 u64 wait_cycles; 25 u64 in_purr = *this_cpu_ptr(&idle_entry_purr_snap); 26 27 wait_cycles = be64_to_cpu(get_lppaca()->wait_state_cycles); 28 wait_cycles += mfspr(SPRN_PURR) - in_purr; 29 get_lppaca()->wait_state_cycles = cpu_to_be64(wait_cycles); 30 } 31 32 static __always_inline void update_idle_spurr_accounting(void) 33 { 34 u64 *idle_spurr_cycles_ptr = this_cpu_ptr(&idle_spurr_cycles); 35 u64 in_spurr = *this_cpu_ptr(&idle_entry_spurr_snap); 36 37 *idle_spurr_cycles_ptr += mfspr(SPRN_SPURR) - in_spurr; 38 } 39 40 static __always_inline void pseries_idle_prolog(void) 41 { 42 ppc64_runlatch_off(); 43 snapshot_purr_idle_entry(); 44 snapshot_spurr_idle_entry(); 45 /* 46 * Indicate to the HV that we are idle. Now would be 47 * a good time to find other work to dispatch. 48 */ 49 get_lppaca()->idle = 1; 50 } 51 52 static __always_inline void pseries_idle_epilog(void) 53 { 54 update_idle_purr_accounting(); 55 update_idle_spurr_accounting(); 56 get_lppaca()->idle = 0; 57 ppc64_runlatch_on(); 58 } 59 60 static inline u64 read_this_idle_purr(void) 61 { 62 /* 63 * If we are reading from an idle context, update the 64 * idle-purr cycles corresponding to the last idle period. 65 * Since the idle context is not yet over, take a fresh 66 * snapshot of the idle-purr. 67 */ 68 if (unlikely(get_lppaca()->idle == 1)) { 69 update_idle_purr_accounting(); 70 snapshot_purr_idle_entry(); 71 } 72 73 return be64_to_cpu(get_lppaca()->wait_state_cycles); 74 } 75 76 static inline u64 read_this_idle_spurr(void) 77 { 78 /* 79 * If we are reading from an idle context, update the 80 * idle-spurr cycles corresponding to the last idle period. 81 * Since the idle context is not yet over, take a fresh 82 * snapshot of the idle-spurr. 83 */ 84 if (get_lppaca()->idle == 1) { 85 update_idle_spurr_accounting(); 86 snapshot_spurr_idle_entry(); 87 } 88 89 return *this_cpu_ptr(&idle_spurr_cycles); 90 } 91 92 #endif /* CONFIG_PPC_PSERIES */ 93 #endif 94