dc8afce5f4
On Pseries LPARs, to calculate utilization, we need to know the [S]PURR ticks when the CPUs were busy or idle. Via pseries_idle_prolog(), pseries_idle_epilog(), we track the idle PURR ticks in the VPA variable "wait_state_cycles". This patch extends the support to account for the idle SPURR ticks. Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1586249263-14048-4-git-send-email-ego@linux.vnet.ibm.com
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _ASM_POWERPC_IDLE_H
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#define _ASM_POWERPC_IDLE_H
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#include <asm/runlatch.h>
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#include <asm/paca.h>
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#ifdef CONFIG_PPC_PSERIES
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DECLARE_PER_CPU(u64, idle_spurr_cycles);
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DECLARE_PER_CPU(u64, idle_entry_purr_snap);
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DECLARE_PER_CPU(u64, idle_entry_spurr_snap);
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static inline void snapshot_purr_idle_entry(void)
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{
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*this_cpu_ptr(&idle_entry_purr_snap) = mfspr(SPRN_PURR);
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}
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static inline void snapshot_spurr_idle_entry(void)
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{
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*this_cpu_ptr(&idle_entry_spurr_snap) = mfspr(SPRN_SPURR);
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}
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static inline void update_idle_purr_accounting(void)
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{
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u64 wait_cycles;
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u64 in_purr = *this_cpu_ptr(&idle_entry_purr_snap);
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wait_cycles = be64_to_cpu(get_lppaca()->wait_state_cycles);
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wait_cycles += mfspr(SPRN_PURR) - in_purr;
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get_lppaca()->wait_state_cycles = cpu_to_be64(wait_cycles);
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}
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static inline void update_idle_spurr_accounting(void)
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{
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u64 *idle_spurr_cycles_ptr = this_cpu_ptr(&idle_spurr_cycles);
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u64 in_spurr = *this_cpu_ptr(&idle_entry_spurr_snap);
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*idle_spurr_cycles_ptr += mfspr(SPRN_SPURR) - in_spurr;
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}
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static inline void pseries_idle_prolog(void)
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{
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ppc64_runlatch_off();
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snapshot_purr_idle_entry();
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snapshot_spurr_idle_entry();
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/*
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* Indicate to the HV that we are idle. Now would be
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* a good time to find other work to dispatch.
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*/
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get_lppaca()->idle = 1;
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}
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static inline void pseries_idle_epilog(void)
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{
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update_idle_purr_accounting();
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update_idle_spurr_accounting();
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get_lppaca()->idle = 0;
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ppc64_runlatch_on();
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}
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#endif /* CONFIG_PPC_PSERIES */
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#endif
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