lkml.org 
[lkml]   [2020]   [Mar]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] irqchip/gic-v4.1: Wait for completion of redistributor's INVALL operation
Date
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>
---
drivers/irqchip/irq-gic-v3-its.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 83b1186ffcad..fc8c2970cee4 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -3784,6 +3784,8 @@ 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)
--
2.19.1

\
 
 \ /
  Last update: 2020-03-02 10:22    [W:0.044 / U:4.228 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site