Re: [PATCH v10 23/24] x86/resctrl: Introduce interface to list assignment states of all the groups

["Luck, Tony" <tony.luck@intel.com>]

On Thu, Dec 12, 2024 at 02:15:26PM -0600, Babu Moger wrote:
> +static int rdtgroup_mbm_assign_control_show(struct kernfs_open_file *of,
> +					    struct seq_file *s, void *v)
> +{
> +	struct rdt_resource *r = of->kn->parent->priv;
> +	struct rdt_mon_domain *dom;
> +	struct rdtgroup *rdtg;
> +	char str[10];
> +
> +	cpus_read_lock();
> +	mutex_lock(&rdtgroup_mutex);
> +	rdt_last_cmd_clear();
> +
> +	if (!resctrl_arch_mbm_cntr_assign_enabled(r)) {
> +		rdt_last_cmd_puts("mbm_cntr_assign mode is not enabled\n");
> +		mutex_unlock(&rdtgroup_mutex);
> +		cpus_read_unlock();
> +		return -EINVAL;
> +	}
> +
> +	list_for_each_entry(rdtg, &rdt_all_groups, rdtgroup_list) {
> +		struct rdtgroup *crg;
> +
> +		seq_printf(s, "%s//", rdtg->kn->name);
> +
> +		list_for_each_entry(dom, &r->mon_domains, hdr.list)
> +			seq_printf(s, "%d=%s;", dom->hdr.id,
> +				   rdtgroup_mon_state_to_str(r, dom, rdtg, str));
> +		seq_putc(s, '\n');

Other resctrl files with domain lists use ';' as a separator, not a
terminator. This code results in:

//0=tl;1=tl;

rather than

//0=tl;1=tl

> +
> +		list_for_each_entry(crg, &rdtg->mon.crdtgrp_list,
> +				    mon.crdtgrp_list) {
> +			seq_printf(s, "%s/%s/", rdtg->kn->name, crg->kn->name);
> +
> +			list_for_each_entry(dom, &r->mon_domains, hdr.list)
> +				seq_printf(s, "%d=%s;", dom->hdr.id,
> +					   rdtgroup_mon_state_to_str(r, dom, crg, str));
> +			seq_putc(s, '\n');

Ditto.

> +		}
> +	}
> +
> +	mutex_unlock(&rdtgroup_mutex);
> +	cpus_read_unlock();
> +	return 0;
> +}