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authorZenghui Yu <yuzenghui@huawei.com>2020-03-04 20:33:11 +0000
committerMarc Zyngier <maz@kernel.org>2020-03-20 17:48:09 +0000
commitb978c25f6ee7d4c79cbe918eed684e53887ec001 (patch)
tree557379c4648fe28c79a19a9653613fcea9c3f7b5 /drivers/irqchip/irq-gic-v3-its.c
parentf3a059219bc718ccc3bf3ff894f089b7e9a93139 (diff)
irqchip/gic-v4.1: Wait for completion of redistributor's INVALL operation
In GICv4.1, we emulate a guest-issued INVALL command by a direct write to GICR_INVALLR. Before we finish the emulation and go back to guest, let's make sure the physical invalidate operation is actually completed and no stale data will be left in redistributor. Per the specification, this can be achieved by polling the GICR_SYNCR.Busy bit (to zero). Signed-off-by: Zenghui Yu <yuzenghui@huawei.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Eric Auger <eric.auger@redhat.com> Link: https://lore.kernel.org/r/20200302092145.899-1-yuzenghui@huawei.com Link: https://lore.kernel.org/r/20200304203330.4967-5-maz@kernel.org
Diffstat (limited to 'drivers/irqchip/irq-gic-v3-its.c')
-rw-r--r--drivers/irqchip/irq-gic-v3-its.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 1af713990123..c84370245bea 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -3827,6 +3827,8 @@ static void its_vpe_4_1_invall(struct its_vpe *vpe)
/* Target the redistributor this vPE is currently known on */
rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base;
gic_write_lpir(val, rdbase + GICR_INVALLR);
+
+ wait_for_syncr(rdbase);
}
static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)