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authorMarc Zyngier <maz@kernel.org>2021-03-22 14:01:53 +0800
committerMarc Zyngier <maz@kernel.org>2021-03-24 18:05:52 +0000
commit301beaf19739cb6e640ed44e630e7da993f0ecc8 (patch)
treeb7c3e0c19300f9cd6d6220f7d15e6901ff7d3363 /drivers/irqchip
parent1e28eed17697bcf343c6743f0028cc3b5dd88bf0 (diff)
irqchip/gic-v3-its: Add a cache invalidation right after vPE unmapping
In order to be able to manipulate the VPT once a vPE has been unmapped, perform the required CMO to invalidate the CPU view of the VPT. Signed-off-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Shenming Lu <lushenming@huawei.com> Link: https://lore.kernel.org/r/20210322060158.1584-2-lushenming@huawei.com
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/irq-gic-v3-its.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index ed46e6057e33..4eb907f65bd0 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -4554,6 +4554,15 @@ static void its_vpe_irq_domain_deactivate(struct irq_domain *domain,
its_send_vmapp(its, vpe, false);
}
+
+ /*
+ * There may be a direct read to the VPT after unmapping the
+ * vPE, to guarantee the validity of this, we make the VPT
+ * memory coherent with the CPU caches here.
+ */
+ if (find_4_1_its() && !atomic_read(&vpe->vmapp_count))
+ gic_flush_dcache_to_poc(page_address(vpe->vpt_page),
+ LPI_PENDBASE_SZ);
}
static const struct irq_domain_ops its_vpe_domain_ops = {