diff options
| author | Ben Horgan <ben.horgan@arm.com> | 2026-09-17 15:56:07 +0100 |
|---|---|---|
| committer | James Morse <james.morse@arm.com> | 2026-10-02 17:39:30 +0100 |
| commit | 9ced048825c7920ca235ec382658b1d87709c5b1 (patch) | |
| tree | d38597adbc5cce7457e49bb4617fefe50ea2ba77 /drivers/resctrl | |
| parent | 63b3495c3d663eab2316e926583e2248679801b1 (diff) | |
arm_mpam: Restore the error interrupt enable from mpam_cpu_online()
When all the associated CPUs to an MSC are offline, possibly caused by
PSCI_CPU_OFF, the power supply to the MSC can be cut off and all the
registers lose their value, including MPAMF_ECR.INTEN. Afterwards, we need
to explicitly set MPAMF_ECR.INTEN when the first associated CPU becomes
online and the power supply to the MSC is recovered.
Restore MPAMF_ECR.INTEN in mpam_cpu_online() when the first associated CPU
of the MSC becomes online.
Fixes: 49aa621c4dca ("arm_mpam: Register and enable IRQs")
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Tested-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: James Morse <james.morse@arm.com>
[morse: rephrased commit message]
Signed-off-by: James Morse <james.morse@arm.com>
Diffstat (limited to 'drivers/resctrl')
| -rw-r--r-- | drivers/resctrl/mpam_devices.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c index 580d7ed38569..32bde94dfbc3 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -1856,8 +1856,14 @@ static int mpam_cpu_online(unsigned int cpu) if (msc->reenable_error_ppi) _enable_percpu_irq(&msc->reenable_error_ppi); - if (atomic_fetch_inc(&msc->online_refs) == 0) + if (atomic_fetch_inc(&msc->online_refs) == 0) { + mutex_lock(&msc->error_irq_lock); + if (msc->error_irq_hw_enabled) + mpam_touch_msc(msc, mpam_enable_msc_ecr, msc); + mutex_unlock(&msc->error_irq_lock); + mpam_reprogram_msc(msc); + } } if (mpam_resctrl_enabled) |