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From: Ruifeng Wang <Ruifeng.Wang@arm.com>
To: "thomas@monjalon.net" <thomas@monjalon.net>, Honnappa Nagarahalli
<Honnappa.Nagarahalli@arm.com>
CC: "dev@dpdk.org" <dev@dpdk.org>, Liang Ma <liang.j.ma@intel.com>, Jan
Viktorin <viktorin@rehivetech.com>, David Christensen
<drc@linux.vnet.ibm.com>, Bruce Richardson <bruce.richardson@intel.com>,
Konstantin Ananyev <konstantin.ananyev@intel.com>, "david.hunt@intel.com"
<david.hunt@intel.com>, "jerinjacobk@gmail.com" <jerinjacobk@gmail.com>,
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"gage.eads@intel.com" <gage.eads@intel.com>, "chris.macnamara@intel.com"
<chris.macnamara@intel.com>, Anatoly Burakov <anatoly.burakov@intel.com>,
"david.marchand@redhat.com" <david.marchand@redhat.com>, nd <nd@arm.com>
Thread-Topic: [dpdk-dev] [PATCH v7 02/10] eal: add power management intrinsics
Thread-Index: AQHWouta3nu6L1PJY0C+rl0kRsuZVamfc1GAgABaf+A=
Date: Tue, 20 Oct 2020 02:49:53 +0000
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References: <da3fe4e5bbe976882c56a71d20a9055c1600e6aa.1602763439.git.anatoly.burakov@intel.com>
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Subject: Re: [dpdk-dev] [PATCH v7 02/10] eal: add power management intrinsics
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Sender: "dev" <dev-bounces@dpdk.org>
> -----Original Message-----
> From: Thomas Monjalon <thomas@monjalon.net>
> Sent: Tuesday, October 20, 2020 5:13 AM
> To: Ruifeng Wang <Ruifeng.Wang@arm.com>; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>
> Cc: dev@dpdk.org; Liang Ma <liang.j.ma@intel.com>; Jan Viktorin
> <viktorin@rehivetech.com>; David Christensen <drc@linux.vnet.ibm.com>;
> Bruce Richardson <bruce.richardson@intel.com>; Konstantin Ananyev
> <konstantin.ananyev@intel.com>; david.hunt@intel.com;
> jerinjacobk@gmail.com; timothy.mcdaniel@intel.com; gage.eads@intel.com;
> chris.macnamara@intel.com; Anatoly Burakov <anatoly.burakov@intel.com>;
> david.marchand@redhat.com
> Subject: Re: [dpdk-dev] [PATCH v7 02/10] eal: add power management
> intrinsics
>=20
> 15/10/2020 14:04, Anatoly Burakov:
> > +/**
> > + * This function is not supported on ARM.
> > + */
> > +static inline void
> > +rte_power_monitor(const volatile void *p, const uint64_t
> expected_value,
> > + const uint64_t value_mask, const uint64_t tsc_timestamp=
,
> > + const uint8_t data_sz) {
> > + RTE_SET_USED(p);
> > + RTE_SET_USED(expected_value);
> > + RTE_SET_USED(value_mask);
> > + RTE_SET_USED(tsc_timestamp);
> > + RTE_SET_USED(data_sz);
> > +}
>=20
> Are you sure it cannot be partially supported with WFE instruction?
>=20
Armv8 WFE instruction can support monitoring of specific address for change=
s,=20
but not monitoring of TSC timestamp.=20