linux-kernel - Re: [PATCH] x86/intel_rdt: Implement "update" mode when writing schemata file

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Date:   Fri, 31 Mar 2017 11:45:52 -0700 (PDT)
From:   Shivappa Vikas <vikas.shivappa@...el.com>
To:     "Luck, Tony" <tony.luck@...el.com>
cc:     Thomas Gleixner <tglx@...utronix.de>,
        Vikas Shivappa <vikas.shivappa@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/intel_rdt: Implement "update" mode when writing
 schemata file



On Fri, 24 Mar 2017, Luck, Tony wrote:

> +++ b/arch/x86/kernel/cpu/intel_rdt_schemata.c
> @@ -56,7 +56,7 @@ static bool cbm_validate(unsigned long var, struct rdt_resource *r)
>  * Read one cache bit mask (hex). Check that it is valid for the current
>  * resource type.
>  */
> -static int parse_cbm(char *buf, struct rdt_resource *r)
> +static int parse_cbm(char *buf, struct rdt_resource *r, struct rdt_domain *d)
> {
> 	unsigned long data;
> 	int ret;
> @@ -66,7 +66,8 @@ static int parse_cbm(char *buf, struct rdt_resource *r)
> 		return ret;

Would need a check here for repeated domain entries to error out something like:

echo -e "L3:1=7f;1=7;1=7ff" | cat > /sys/fs/resctrl/p1/schemata

  	if (d->have_newcbm)
  		return -EINVAL;


> 	if (!cbm_validate(data, r))
> 		return -EINVAL;
> -	r->tmp_cbms[r->num_tmp_cbms++] = data;
> +	d->new_cbm = data;
> +	d->have_new_cbm = true;
>