Messages in this thread Patch in this message | | | From | Ganapatrao Kulkarni <> | Subject | [PATCH] irqchip/gic-v3-its: Flush GICR caching for a cross node collection move of an irq | Date | Wed, 20 Dec 2017 14:45:44 +0530 |
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When an interrupt is moved, it is possible that an implementation that supports caching might still have cached data for a previous (no longer valid) mapping of the interrupt. In particular, in a distributed GIC implementation like multi-socket SoC platfroms. Hence it is necessary to flush cached entries after cross node collection migration.
Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com> --- drivers/irqchip/irq-gic-v3-its.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 4039e64..ea849a1 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -1119,6 +1119,12 @@ static int its_set_affinity(struct irq_data *d, const struct cpumask *mask_val, if (cpu != its_dev->event_map.col_map[id]) { target_col = &its_dev->its->collections[cpu]; its_send_movi(its_dev, target_col, id); + /* Issue INV for cross node collection move on + * multi socket systems. + */ + if (cpu_to_node(cpu) != + cpu_to_node(its_dev->event_map.col_map[id])) + its_send_inv(its_dev, id); its_dev->event_map.col_map[id] = cpu; irq_data_update_effective_affinity(d, cpumask_of(cpu)); } -- 2.9.4
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