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Subject[tip: irq/core] irqchip/gic-v4.1: Suppress per-VLPI doorbell
The following commit has been merged into the irq/core branch of tip:

Commit-ID: 3858d4dfdfb845e51ee8b4045f61ccba2c3111ee
Gitweb: https://git.kernel.org/tip/3858d4dfdfb845e51ee8b4045f61ccba2c3111ee
Author: Marc Zyngier <maz@kernel.org>
AuthorDate: Tue, 24 Dec 2019 11:10:37
Committer: Marc Zyngier <maz@kernel.org>
CommitterDate: Wed, 22 Jan 2020 14:22:21

irqchip/gic-v4.1: Suppress per-VLPI doorbell

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>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20191224111055.11836-15-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 1d8d96a..53e91c9 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -718,7 +718,7 @@ 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;
@@ -741,7 +741,7 @@ 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;
@@ -1353,6 +1353,13 @@ static void its_vlpi_set_doorbell(struct irq_data *d, bool enable)
u32 event = its_get_event_id(d);
struct its_vlpi_map *map;

+ /*
+ * GICv4.1 does away with the per-LPI nonsense, nothing to do
+ * here.
+ */
+ if (is_v4_1(its_dev->its))
+ return;
+
map = dev_event_to_vlpi_map(its_dev, event);

if (map->db_enabled == enable)
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