lkml.org 
[lkml]   [2019]   [Sep]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 19/35] irqchip/gic-v4.1: Suppress per-VLPI doorbell
Date
Since GICv4.1 gives us a per-VPE doorbell, avoid programming anything
else on VMOVI/VMAPI/VMAPTI and on any other action that would have
otherwise resulted in a per-VLPI doorbell to be programmed.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
drivers/irqchip/irq-gic-v3-its.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index eda35e66237f..b791c9beddf2 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -691,7 +691,7 @@ static struct its_vpe *its_build_vmapti_cmd(struct its_node *its,
{
u32 db;

- if (desc->its_vmapti_cmd.db_enabled)
+ if (!is_v4_1(its) && desc->its_vmapti_cmd.db_enabled)
db = desc->its_vmapti_cmd.vpe->vpe_db_lpi;
else
db = 1023;
@@ -714,7 +714,7 @@ static struct its_vpe *its_build_vmovi_cmd(struct its_node *its,
{
u32 db;

- if (desc->its_vmovi_cmd.db_enabled)
+ if (!is_v4_1(its) && desc->its_vmovi_cmd.db_enabled)
db = desc->its_vmovi_cmd.vpe->vpe_db_lpi;
else
db = 1023;
@@ -1227,6 +1227,13 @@ static void its_vlpi_set_doorbell(struct irq_data *d, bool enable)
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
u32 event = its_get_event_id(d);

+ /*
+ * GICv4.1 does away with the per-LPI nonsense, nothing to do
+ * here.
+ */
+ if (is_v4_1(its_dev->its))
+ return;
+
if (its_dev->event_map.vlpi_maps[event].db_enabled == enable)
return;

--
2.20.1
\
 
 \ /
  Last update: 2019-09-23 20:28    [W:0.301 / U:6.188 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site