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x86/intel_rdt: Add diagnostics when writing the cpus file 

Can't add a cpu to a monitor group unless it belongs to parent
group. Can't delete cpus from the default group.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Vikas Shivappa <vikas.shivappa@intel.com>
Cc: Boris Petkov <bp@suse.de>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lkml.kernel.org/r/757a869a25e9fc1b7a2e9bc43e1159455c1964a0.1506382469.git.tony.luck@intel.com
This commit is contained in:
Tony Luck 2017-09-25 16:39:36 -07:00 committed by Thomas Gleixner
parent 29e74f35b2
commit 94457b36e8
1 changed files with 12 additions and 3 deletions
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15
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
View File

@ -264,8 +264,10 @@ static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
/* Check whether cpus belong to parent ctrl group */
cpumask_andnot(tmpmask, newmask, &prgrp->cpu_mask);
if (cpumask_weight(tmpmask))
if (cpumask_weight(tmpmask)) {
rdt_last_cmd_puts("can only add CPUs to mongroup that belong to parent\n");
return -EINVAL;
}
/* Check whether cpus are dropped from this group */
cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
@ -317,8 +319,10 @@ static int cpus_ctrl_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
if (cpumask_weight(tmpmask)) {
/* Can't drop from default group */
if (rdtgrp == &rdtgroup_default)
if (rdtgrp == &rdtgroup_default) {
rdt_last_cmd_puts("Can't drop CPUs from default group\n");
return -EINVAL;
}
/* Give any dropped cpus to rdtgroup_default */
cpumask_or(&rdtgroup_default.cpu_mask,
@ -383,8 +387,10 @@ static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of,
}
rdtgrp = rdtgroup_kn_lock_live(of->kn);
rdt_last_cmd_clear();
if (!rdtgrp) {
ret = -ENOENT;
rdt_last_cmd_puts("directory was removed\n");
goto unlock;
}
@ -393,13 +399,16 @@ static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of,
else
ret = cpumask_parse(buf, newmask);
if (ret)
if (ret) {
rdt_last_cmd_puts("bad cpu list/mask\n");
goto unlock;
}
/* check that user didn't specify any offline cpus */
cpumask_andnot(tmpmask, newmask, cpu_online_mask);
if (cpumask_weight(tmpmask)) {
ret = -EINVAL;
rdt_last_cmd_puts("can only assign online cpus\n");
goto unlock;
}