linux-kernel - Re: [PATCH v8 6/9] drivers: perf: hisi: Add support for Hisilicon Djtag driver

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Message-ID: <20170609164553.GB3043@leverpostej>
Date:   Fri, 9 Jun 2017 17:45:53 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     John Garry <john.garry@...wei.com>
Cc:     Shaokun Zhang <zhangshaokun@...ilicon.com>, will.deacon@....com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        anurup.m@...wei.com, tanxiaojun@...wei.com, xuwei5@...ilicon.com,
        sanil.kumar@...ilicon.com, gabriele.paoloni@...wei.com,
        shiju.jose@...wei.com, huangdaode@...ilicon.com,
        linuxarm@...wei.com, shyju.pv@...wei.com, anurupvasu@...il.com
Subject: Re: [PATCH v8 6/9] drivers: perf: hisi: Add support for Hisilicon
 Djtag driver

On Fri, Jun 09, 2017 at 05:09:25PM +0100, John Garry wrote:
> At this point, we would rather concentrate on our new chipset, which
> is based on same perf HW architecture (so much code reuse), but uses
> directly mapped registers and *no djtag* - in this, most of the
> upstream effort from all parties is not wasted.

FWIW, I suspect the MMIO-based PMU is going to have a smoother path
upstream, assuming it's not shared with other agents (and we don't have
another locking scheme to contend with).

Thanks,
Mark.