On Tue, Jul 20, 2021 at 6:27 PM Nitesh Narayan Lal <nitesh@xxxxxxxxxx> wrote:
>
> The driver uses irq_set_affinity_hint() to:
>
> - Set the affinity_hint which is consumed by the userspace for
> distributing the interrupts
>
> - Enforce affinity
>
> As per commit 6ac17fe8c14a ("mailbox: bcm-flexrm-mailbox: Set IRQ affinity
> hint for FlexRM ring IRQs") the latter is done to ensure that the FlexRM
> ring interrupts are evenly spread across all available CPUs. However, since
> commit a0c9259dc4e1 ("irq/matrix: Spread interrupts on allocation") the
> spreading of interrupts is dynamically performed at the time of allocation.
> Hence, there is no need for the drivers to enforce their own affinity for
> the spreading of interrupts.
>
> Also, irq_set_affinity_hint() applying the provided cpumask as an affinity
> for the interrupt is an undocumented side effect. To remove this side
> effect irq_set_affinity_hint() has been marked as deprecated and new
> interfaces have been introduced. Hence, replace the irq_set_affinity_hint()
> with the new interface irq_update_affinity_hint() that only sets the
> affinity_hint pointer.
>
> Signed-off-by: Nitesh Narayan Lal <nitesh@xxxxxxxxxx>
> ---
> drivers/mailbox/bcm-flexrm-mailbox.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mailbox/bcm-flexrm-mailbox.c b/drivers/mailbox/bcm-flexrm-mailbox.c
> index 78073ad1f2f1..16982c13d323 100644
> --- a/drivers/mailbox/bcm-flexrm-mailbox.c
> +++ b/drivers/mailbox/bcm-flexrm-mailbox.c
> @@ -1298,7 +1298,7 @@ static int flexrm_startup(struct mbox_chan *chan)
> val = (num_online_cpus() < val) ? val / num_online_cpus() : 1;
> cpumask_set_cpu((ring->num / val) % num_online_cpus(),
> &ring->irq_aff_hint);
> - ret = irq_set_affinity_hint(ring->irq, &ring->irq_aff_hint);
> + ret = irq_update_affinity_hint(ring->irq, &ring->irq_aff_hint);
> if (ret) {
> dev_err(ring->mbox->dev,
> "failed to set IRQ affinity hint for ring%d\n",
> @@ -1425,7 +1425,7 @@ static void flexrm_shutdown(struct mbox_chan *chan)
>
> /* Release IRQ */
> if (ring->irq_requested) {
> - irq_set_affinity_hint(ring->irq, NULL);
> + irq_update_affinity_hint(ring->irq, NULL);
> free_irq(ring->irq, ring);
> ring->irq_requested = false;
> }
>
Seems ok to me. But I don't have the h/w to test.
Acked-by: Jassi Brar <jaswinder.singh@xxxxxxxxxx>
cheers.
