linux-kernel - [PATCH v2 0/4] x86, mwaitt: introduce AMD mwaitt support

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Date:	Tue, 9 Jun 2015 11:13:37 +0800
From:	Huang Rui <ray.huang@....com>
To:	Borislav Petkov <bp@...e.de>,
	Andy Lutomirski <luto@...capital.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	"John Stultz" <john.stultz@...aro.org>,
	Frédéric Weisbecker <fweisbec@...il.com>
CC:	<linux-kernel@...r.kernel.org>, <x86@...nel.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Aaron Lu <aaron.lu@...el.com>,
	Suravee Suthikulanit <suravee.suthikulpanit@....com>,
	Tony Li <tony.li@....com>, Ken Xue <ken.xue@....com>,
	Huang Rui <ray.huang@....com>
Subject: [PATCH v2 0/4] x86, mwaitt: introduce AMD mwaitt support

Hi,

This patch set introduces a new instruction support on AMD Carrizo (Family
15h, Model 60h-6fh). It adds mwaitx delay function with a configurable
timer.

Andy and Boris provide a suggestion which use mwaitx on delay method.

Some discussions of the background, please see:
http://marc.info/?l=linux-kernel&m=143202042530498&w=2
http://marc.info/?l=linux-kernel&m=143161327003541&w=2
http://marc.info/?l=linux-kernel&m=143222815331016&w=2

They are rebased on tip/master.

Changes from v1 -> v2
- Remove mwaitx idle implementation since some disputes without power
  improvement.
- Add a patch which implement another use case on delay.
- Introduce a kernel parameter (delay) to make delay method configurable.


I already do some testing with mwaitx on udelay.

Test scenario: 

glb_loops = usec_to_tsc(delay_usec)
rdtsc -> read TSC counters as start
mwaitx_delay(glb_loops)
rdtsc -> read TSC counters as end
diff = end - start

Compared the real TSC counts (diff), that means the loops of counter goes.
And glb_loops is the input value of the EBX, that is the expect loops which
user configures. Below is 10000 us of mwaitx delay, we could see about 1200
(diff - glb_loops) delayed with mwaitx.

[ 2369.008651] start=4401974718758, end=4401992576888, diff=17858130, glb_loops=17856939

Thanks,
Rui

Huang Rui (4):
  x86, mwaitt: add monitorx and mwaitx instruction
  x86, mwaitt: make delay method configurable
  x86, mwaitt: introduce mwaix delay with a configurable timer
  x86, mwaitt: add documents of delay option

 Documentation/kernel-parameters.txt |    7 ++++++
 arch/x86/include/asm/cpufeature.h   |    1 +
 arch/x86/include/asm/delay.h        |    8 ++++++
 arch/x86/include/asm/mwait.h        |   26 ++++++++++++++++++++
 arch/x86/kernel/setup.c             |   22 +++++++++++++++++
 arch/x86/lib/delay.c                |   46 +++++++++++++++++++++++++++++++++--
 6 files changed, 108 insertions(+), 2 deletions(-)

-- 
1.7.9.5

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