linux-kernel - Re: [PATCH v8 08/10] fs/resctrl: Modify rdt_parse

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Message-ID: <b08c1d64-8d19-48e7-853a-21947d61ff98@intel.com>
Date: Thu, 7 Aug 2025 18:52:09 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Babu Moger <babu.moger@....com>, <corbet@....net>, <tony.luck@...el.com>,
	<Dave.Martin@....com>, <james.morse@....com>, <tglx@...utronix.de>,
	<mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <akpm@...ux-foundation.org>,
	<paulmck@...nel.org>, <rostedt@...dmis.org>, <Neeraj.Upadhyay@....com>,
	<david@...hat.com>, <arnd@...db.de>, <fvdl@...gle.com>, <seanjc@...gle.com>,
	<thomas.lendacky@....com>, <pawan.kumar.gupta@...ux.intel.com>,
	<yosry.ahmed@...ux.dev>, <sohil.mehta@...el.com>, <xin@...or.com>,
	<kai.huang@...el.com>, <xiaoyao.li@...el.com>, <peterz@...radead.org>,
	<me@...aill.net>, <mario.limonciello@....com>, <xin3.li@...el.com>,
	<ebiggers@...gle.com>, <ak@...ux.intel.com>, <chang.seok.bae@...el.com>,
	<andrew.cooper3@...rix.com>, <perry.yuan@....com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<manali.shukla@....com>, <gautham.shenoy@....com>
Subject: Re: [PATCH v8 08/10] fs/resctrl: Modify rdt_parse_data to pass mode
 and CLOSID

Hi Babu,

On 8/5/25 4:30 PM, Babu Moger wrote:
> parse_cbm() and parse_bw() require mode and CLOSID to validate the Capacity

Again [1], parse_bw() does not validate any CBMs.

To be more specific: "mode" -> "resource group mode"?

> Bit Mask (CBM). It is passed via struct rdtgroup in struct rdt_parse_data.
> 
> The io_alloc feature also uses CBMs to indicate which portions of cache are
> allocated for I/O traffic. The CBMs are provided by user space and need to
> be validated the same as CBMs provided for general (CPU) cache allocation.
> parse_cbm() cannot be used as-is since io_alloc does not have rdtgroup
> context.
> 
> Pass the mode and CLOSID directly to parse_cbm() via struct rdt_parse_data
> instead of through the rdtgroup struct to facilitate calling parse_cbm() to
> verify the CBM of the io_alloc feature.
> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---

...

> @@ -156,9 +157,10 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
>  static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
>  		     struct rdt_ctrl_domain *d)
>  {
> -	struct rdtgroup *rdtgrp = data->rdtgrp;
> +	enum rdtgrp_mode mode = data->mode;
>  	struct resctrl_staged_config *cfg;
>  	struct rdt_resource *r = s->res;
> +	u32 closid = data->closid;
>  	u32 cbm_val;
>  
>  	cfg = &d->staged_config[s->conf_type];
> @@ -171,7 +173,7 @@ static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
>  	 * Cannot set up more than one pseudo-locked region in a cache
>  	 * hierarchy.
>  	 */
> -	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
> +	if (mode == RDT_MODE_PSEUDO_LOCKSETUP &&
>  	    rdtgroup_pseudo_locked_in_hierarchy(d)) {
>  		rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
>  		return -EINVAL;
> @@ -180,8 +182,8 @@ static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
>  	if (!cbm_validate(data->buf, &cbm_val, r))
>  		return -EINVAL;
>  
> -	if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
> -	     rdtgrp->mode == RDT_MODE_SHAREABLE) &&
> +	if ((mode == RDT_MODE_EXCLUSIVE ||
> +	     mode == RDT_MODE_SHAREABLE) &&

This can now be on one line?

>  	    rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
>  		rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
>  		return -EINVAL;

Reinette

[1] https://lore.kernel.org/lkml/798ba4db-3ac2-44a9-9e0d-e9cbb0dbff45@intel.com/