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From: Zenghui Yu <yuzenghui@huawei.com>
To: <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<kvmarm@lists.cs.columbia.edu>
Cc: <tglx@linutronix.de>, <jason@lakedaemon.net>, <maz@kernel.org>,
	<wanghaibin.wang@huawei.com>, <wangjingyi11@huawei.com>,
	Zenghui Yu <yuzenghui@huawei.com>
Subject: [PATCH] irqchip/gic-v4.1: Use readx_poll_timeout_atomic() to fix sleep in atomic
Date: Fri, 5 Jun 2020 13:23:45 +0800	[thread overview]
Message-ID: <20200605052345.1494-1-yuzenghui@huawei.com> (raw)

readx_poll_timeout() can sleep if @sleep_us is specified by the caller,
and is therefore unsafe to be used inside the atomic context, which is
this case when we use it to poll the GICR_VPENDBASER.Dirty bit in
irq_set_vcpu_affinity() callback.

Let's convert to its atomic version instead which helps to get the v4.1
board back to life!

Fixes: 96806229ca03 ("irqchip/gic-v4.1: Add support for VPENDBASER's Dirty+Valid signaling")
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
---
 drivers/irqchip/irq-gic-v3-its.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index cd685f521c77..6a5a87fc4601 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -3797,10 +3797,10 @@ static void its_wait_vpt_parse_complete(void)
 	if (!gic_rdists->has_vpend_valid_dirty)
 		return;
 
-	WARN_ON_ONCE(readq_relaxed_poll_timeout(vlpi_base + GICR_VPENDBASER,
-						val,
-						!(val & GICR_VPENDBASER_Dirty),
-						10, 500));
+	WARN_ON_ONCE(readq_relaxed_poll_timeout_atomic(vlpi_base + GICR_VPENDBASER,
+						       val,
+						       !(val & GICR_VPENDBASER_Dirty),
+						       10, 500));
 }
 
 static void its_vpe_schedule(struct its_vpe *vpe)
-- 
2.19.1


WARNING: multiple messages have this Message-ID (diff)
From: Zenghui Yu <yuzenghui@huawei.com>
To: <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<kvmarm@lists.cs.columbia.edu>
Cc: jason@lakedaemon.net, maz@kernel.org, tglx@linutronix.de
Subject: [PATCH] irqchip/gic-v4.1: Use readx_poll_timeout_atomic() to fix sleep in atomic
Date: Fri, 5 Jun 2020 13:23:45 +0800	[thread overview]
Message-ID: <20200605052345.1494-1-yuzenghui@huawei.com> (raw)

readx_poll_timeout() can sleep if @sleep_us is specified by the caller,
and is therefore unsafe to be used inside the atomic context, which is
this case when we use it to poll the GICR_VPENDBASER.Dirty bit in
irq_set_vcpu_affinity() callback.

Let's convert to its atomic version instead which helps to get the v4.1
board back to life!

Fixes: 96806229ca03 ("irqchip/gic-v4.1: Add support for VPENDBASER's Dirty+Valid signaling")
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
---
 drivers/irqchip/irq-gic-v3-its.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index cd685f521c77..6a5a87fc4601 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -3797,10 +3797,10 @@ static void its_wait_vpt_parse_complete(void)
 	if (!gic_rdists->has_vpend_valid_dirty)
 		return;
 
-	WARN_ON_ONCE(readq_relaxed_poll_timeout(vlpi_base + GICR_VPENDBASER,
-						val,
-						!(val & GICR_VPENDBASER_Dirty),
-						10, 500));
+	WARN_ON_ONCE(readq_relaxed_poll_timeout_atomic(vlpi_base + GICR_VPENDBASER,
+						       val,
+						       !(val & GICR_VPENDBASER_Dirty),
+						       10, 500));
 }
 
 static void its_vpe_schedule(struct its_vpe *vpe)
-- 
2.19.1

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

WARNING: multiple messages have this Message-ID (diff)
From: Zenghui Yu <yuzenghui@huawei.com>
To: <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<kvmarm@lists.cs.columbia.edu>
Cc: jason@lakedaemon.net, maz@kernel.org, wangjingyi11@huawei.com,
	Zenghui Yu <yuzenghui@huawei.com>,
	wanghaibin.wang@huawei.com, tglx@linutronix.de
Subject: [PATCH] irqchip/gic-v4.1: Use readx_poll_timeout_atomic() to fix sleep in atomic
Date: Fri, 5 Jun 2020 13:23:45 +0800	[thread overview]
Message-ID: <20200605052345.1494-1-yuzenghui@huawei.com> (raw)

readx_poll_timeout() can sleep if @sleep_us is specified by the caller,
and is therefore unsafe to be used inside the atomic context, which is
this case when we use it to poll the GICR_VPENDBASER.Dirty bit in
irq_set_vcpu_affinity() callback.

Let's convert to its atomic version instead which helps to get the v4.1
board back to life!

Fixes: 96806229ca03 ("irqchip/gic-v4.1: Add support for VPENDBASER's Dirty+Valid signaling")
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
---
 drivers/irqchip/irq-gic-v3-its.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index cd685f521c77..6a5a87fc4601 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -3797,10 +3797,10 @@ static void its_wait_vpt_parse_complete(void)
 	if (!gic_rdists->has_vpend_valid_dirty)
 		return;
 
-	WARN_ON_ONCE(readq_relaxed_poll_timeout(vlpi_base + GICR_VPENDBASER,
-						val,
-						!(val & GICR_VPENDBASER_Dirty),
-						10, 500));
+	WARN_ON_ONCE(readq_relaxed_poll_timeout_atomic(vlpi_base + GICR_VPENDBASER,
+						       val,
+						       !(val & GICR_VPENDBASER_Dirty),
+						       10, 500));
 }
 
 static void its_vpe_schedule(struct its_vpe *vpe)
-- 
2.19.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2020-06-05  5:24 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-05  5:23 Zenghui Yu [this message]
2020-06-05  5:23 ` [PATCH] irqchip/gic-v4.1: Use readx_poll_timeout_atomic() to fix sleep in atomic Zenghui Yu
2020-06-05  5:23 ` Zenghui Yu
2020-06-10 13:59 ` Zenghui Yu
2020-06-10 13:59   ` Zenghui Yu
2020-06-10 13:59   ` Zenghui Yu
2020-06-10 15:02   ` Marc Zyngier
2020-06-10 15:02     ` Marc Zyngier
2020-06-10 15:02     ` Marc Zyngier
2020-06-10 18:43 ` Marc Zyngier
2020-06-10 18:43   ` Marc Zyngier
2020-06-10 18:43   ` Marc Zyngier
2020-06-30 10:11 ` [tip: irq/urgent] " tip-bot2 for Zenghui Yu

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