lkml.org 
[lkml]   [2016]   [Jul]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] drivers/perf: arm-pmu: Handle per-interrupt affinity mask
On Fri, Jul 01, 2016 at 02:21:31PM +0100, Marc Zyngier wrote:
> On a big-little system, PMUs can be wired to CPUs using per CPU
> interrups (PPI). In this case, it is important to make sure that
> the enable/disable do happen on the right set of CPUs.
>
> So instead of relying on the interrupt-affinity property, we can
> use the actual percpu affinity that DT exposes as part of the
> interrupt specifier. The DT binding is also updated to reflect
> the fact that the interrupt-affinity property shouldn't be used
> in that case.

[...]

> - /* If we didn't manage to parse anything, claim to support all CPUs */
> - if (cpumask_weight(&pmu->supported_cpus) == 0)
> - cpumask_setall(&pmu->supported_cpus);
> + /* If we didn't manage to parse anything, try the interrupt affinity */
> + if (cpumask_weight(&pmu->supported_cpus) == 0) {
> + if (!using_spi) {
> + /* If using PPIs, check the affinity of the partition */
> + int irq = platform_get_irq(pdev, 0);
> + irq_get_percpu_devid_partition(irq,
> + &pmu->supported_cpus);

Should we not at least propagate the failure if this returns -EINVAL?

Will

\
 
 \ /
  Last update: 2016-07-06 13:21    [W:0.052 / U:2.616 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site