diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 06f14f20368b..f5068a95d3c4 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -2318,6 +2318,33 @@ static void its_vpe_db_proxy_map_locked(struct its_vpe *vpe) its_send_mapti(vpe_proxy.dev, vpe->vpe_db_lpi, vpe->vpe_proxy_event); } +static void its_vpe_db_proxy_move(struct its_vpe *vpe, int from, int to) +{ + unsigned long flags; + struct its_collection *target_col; + + if (gic_rdists->has_direct_lpi) { + void __iomem *rdbase; + + rdbase = per_cpu_ptr(gic_rdists->rdist, from)->rd_base; + gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_CLRLPIR); + while (gic_read_lpir(rdbase + GICR_SYNCR) & 1) + cpu_relax(); + + return; + } + + raw_spin_lock_irqsave(&vpe_proxy.lock, flags); + + its_vpe_db_proxy_map_locked(vpe); + + target_col = &vpe_proxy.dev->its->collections[to]; + its_send_movi(vpe_proxy.dev, target_col, vpe->vpe_proxy_event); + vpe_proxy.dev->event_map.col_map[vpe->vpe_proxy_event] = to; + + raw_spin_unlock_irqrestore(&vpe_proxy.lock, flags); +} + static int its_vpe_set_affinity(struct irq_data *d, const struct cpumask *mask_val, bool force) @@ -2328,12 +2355,15 @@ static int its_vpe_set_affinity(struct irq_data *d, /* * Changing affinity is mega expensive, so let's be as lazy as * we can and only do it if we really have to. Also, if mapped - * into the proxy device, we need to nuke that mapping. + * into the proxy device, we need to move the doorbell + * interrupt to its new location. */ if (vpe->col_idx != cpu) { - its_vpe_db_proxy_unmap(vpe); + int from = vpe->col_idx; + vpe->col_idx = cpu; its_send_vmovp(vpe); + its_vpe_db_proxy_move(vpe, from, cpu); } return IRQ_SET_MASK_OK_DONE; |