cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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idle.h (2372B)

      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
      8DECLARE_PER_CPU(u64, idle_spurr_cycles);
      9DECLARE_PER_CPU(u64, idle_entry_purr_snap);
     10DECLARE_PER_CPU(u64, idle_entry_spurr_snap);
     11
     12static inline void snapshot_purr_idle_entry(void)
     13{
     14	*this_cpu_ptr(&idle_entry_purr_snap) = mfspr(SPRN_PURR);
     15}
     16
     17static inline void snapshot_spurr_idle_entry(void)
     18{
     19	*this_cpu_ptr(&idle_entry_spurr_snap) = mfspr(SPRN_SPURR);
     20}
     21
     22static 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
     32static 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
     40static 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
     52static 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
     60static 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
     76static 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