scsi: lpfc: Use irq_set_affinity()

The driver uses irq_set_affinity_hint to set the affinity for the lpfc
interrupts to a mask corresponding to the local NUMA node to avoid
performance overhead on AMD architectures.

However, irq_set_affinity_hint() setting the affinity is an undocumented
side effect that this function also sets the affinity under the hood.
To remove this side effect irq_set_affinity_hint() has been marked as
deprecated and new interfaces have been introduced.

Also, as per the commit dcaa21367938 ("scsi: lpfc: Change default IRQ model
on AMD architectures"):
"On AMD architecture, revert the irq allocation to the normal style
(non-managed) and then use irq_set_affinity_hint() to set the cpu affinity
and disable user-space rebalancing."
we don't really need to set the affinity_hint as user-space rebalancing for
the lpfc interrupts is not desired.

Hence, replace the irq_set_affinity_hint() with irq_set_affinity() which
only applies the affinity for the interrupts.

Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: James Smart <jsmart2021@gmail.com>
Link: https://lore.kernel.org/r/20210903152430.244937-12-nitesh@redhat.com

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index ba17a8f..9457552 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -12709,7 +12709,7 @@ lpfc_irq_set_aff(struct lpfc_hba_eq_hdl *eqhdl, unsigned int cpu)
        cpumask_clear(&eqhdl->aff_mask);
        cpumask_set_cpu(cpu, &eqhdl->aff_mask);
        irq_set_status_flags(eqhdl->irq, IRQ_NO_BALANCING);
-       irq_set_affinity_hint(eqhdl->irq, &eqhdl->aff_mask);
+       irq_set_affinity(eqhdl->irq, &eqhdl->aff_mask);
 }
 
 /**
@@ -12998,7 +12998,6 @@ cfg_fail_out:
        for (--index; index >= 0; index--) {
                eqhdl = lpfc_get_eq_hdl(index);
                lpfc_irq_clear_aff(eqhdl);
-               irq_set_affinity_hint(eqhdl->irq, NULL);
                free_irq(eqhdl->irq, eqhdl);
        }
 
@@ -13159,7 +13158,6 @@ lpfc_sli4_disable_intr(struct lpfc_hba *phba)
                for (index = 0; index < phba->cfg_irq_chann; index++) {
                        eqhdl = lpfc_get_eq_hdl(index);
                        lpfc_irq_clear_aff(eqhdl);
-                       irq_set_affinity_hint(eqhdl->irq, NULL);
                        free_irq(eqhdl->irq, eqhdl);
                }
        } else {