linux-kernel - [tip: irq/core] irqchip/gic-v4.1: Suppress per-VLPI doorbell

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Message-ID: <157989306648.396.11181770657733195391.tip-bot2@tip-bot2>
Date:   Fri, 24 Jan 2020 19:11:06 -0000
From:   "tip-bot2 for Marc Zyngier" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Marc Zyngier <maz@...nel.org>, Zenghui Yu <yuzenghui@...wei.com>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
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@...nel.org>
AuthorDate:    Tue, 24 Dec 2019 11:10:37 
Committer:     Marc Zyngier <maz@...nel.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@...nel.org>
Reviewed-by: Zenghui Yu <yuzenghui@...wei.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)