Handle Appolo Lake errata APL31.
If the workaround is activated, always send IPI for wake up, not rely on the write to the monitor line. This fixes Appolo Lake machines early hang in sched_bind(), without requiring user to manually select idle method. Sponsored by: The FreeBSD Foundation MFC after: 1 week
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=333026
@ -575,6 +575,11 @@ cpu_idle(int busy)
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busy, curcpu);
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}
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static int cpu_idle_apl31_workaround;
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SYSCTL_INT(_machdep, OID_AUTO, idle_apl31, CTLFLAG_RW,
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&cpu_idle_apl31_workaround, 0,
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"Appolo Lake APL31 MWAIT bug workaround");
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int
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cpu_idle_wakeup(int cpu)
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{
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@ -586,7 +591,7 @@ cpu_idle_wakeup(int cpu)
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return (0);
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case STATE_MWAIT:
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atomic_store_int(state, STATE_RUNNING);
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return (1);
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return (cpu_idle_apl31_workaround ? 0 : 1);
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case STATE_RUNNING:
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return (1);
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default:
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@ -689,6 +694,13 @@ cpu_idle_tun(void *unused __unused)
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if (TUNABLE_STR_FETCH("machdep.idle", tunvar, sizeof(tunvar)))
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cpu_idle_selector(tunvar);
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if (cpu_vendor_id == CPU_VENDOR_INTEL && cpu_id == 0x506c9) {
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/*
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* Appolo Lake errata APL31.
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*/
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cpu_idle_apl31_workaround = 1;
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}
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TUNABLE_INT_FETCH("machdep.idle_apl31", &cpu_idle_apl31_workaround);
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}
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SYSINIT(cpu_idle_tun, SI_SUB_CPU, SI_ORDER_MIDDLE, cpu_idle_tun, NULL);
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