netdev - Re: [PATCH 12/15] octeontx2-af: Add TIM unit support.

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Message-Id: <20191117.103602.1078870124245169278.davem@davemloft.net>
Date:   Sun, 17 Nov 2019 10:36:02 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     sunil.kovvuri@...il.com
Cc:     netdev@...r.kernel.org, apinski@...vell.com,
        pbhagavatula@...vell.com, sgoutham@...vell.com
Subject: Re: [PATCH 12/15] octeontx2-af: Add TIM unit support.

From: sunil.kovvuri@...il.com
Date: Sun, 17 Nov 2019 21:44:23 +0530

> +static u64 get_tenns_tsc(void)
> +{
> +	u64 tsc = 0;
> +
> +#if defined(CONFIG_ARM64)
> +	asm volatile("mrs %0, cntvct_el0" : "=r" (tsc));
> +#endif
> +	return tsc;
> +}
> +
> +static u64 get_tenns_clk(void)
> +{
> +	u64 tsc = 0;
> +
> +#if defined(CONFIG_ARM64)
> +	asm volatile("mrs %0, cntfrq_el0" : "=r" (tsc));
> +#endif
> +	return tsc;
> +}

You cannot do this.

Read the tick register of the cpu in a portable way, we have interfaces for
this.  If not, create one.