From: Valentin Schneider <valentin.schneider@arm.com>
To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: Marc Zyngier <maz@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>
Subject: [RFC PATCH v2 08/10] irqchip/gic-v3-its: Use irq_chip_ack_parent()
Date: Tue, 25 May 2021 18:32:53 +0100 [thread overview]
Message-ID: <20210525173255.620606-9-valentin.schneider@arm.com> (raw)
In-Reply-To: <20210525173255.620606-1-valentin.schneider@arm.com>
Subsequent patches will make the GIC irqchips use a flow handler that
issues an ->irq_ack(). irqchips of child domains need to handle this.
Note: I'm very much not fond of this; this is treacherous and explodes if
any parent chip doesn't have an ->ack() callback. It turns out okay with
EOImode=0 because handle_fasteoi_irq() doesn't issue any ->ack(), but that
is very fragile at best.
An alternative would be to
o make irq_chip_ack_parent() check the callback against NULL
o make irq_chip_ack_parent() the default chip->irq_ack() via
MSI_FLAG_USE_DEF_CHIP_OPS.
XXX: what about pMSI and fMSI ?
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
---
drivers/irqchip/irq-gic-v3-its-pci-msi.c | 1 +
drivers/irqchip/irq-gic-v3-its.c | 1 +
2 files changed, 2 insertions(+)
diff --git a/drivers/irqchip/irq-gic-v3-its-pci-msi.c b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
index ad2810c017ed..5bc2787ee86a 100644
--- a/drivers/irqchip/irq-gic-v3-its-pci-msi.c
+++ b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
@@ -27,6 +27,7 @@ static struct irq_chip its_msi_irq_chip = {
.name = "ITS-MSI",
.irq_unmask = its_unmask_msi_irq,
.irq_mask = its_mask_msi_irq,
+ .irq_ack = irq_chip_ack_parent,
.irq_eoi = irq_chip_eoi_parent,
.irq_write_msi_msg = pci_msi_domain_write_msg,
};
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 2e6923c2c8a8..ce39d52409e9 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1976,6 +1976,7 @@ static struct irq_chip its_irq_chip = {
.name = "ITS",
.irq_mask = its_mask_irq,
.irq_unmask = its_unmask_irq,
+ .irq_ack = irq_chip_ack_parent,
.irq_eoi = irq_chip_eoi_parent,
.irq_set_affinity = its_set_affinity,
.irq_compose_msi_msg = its_irq_compose_msi_msg,
--
2.25.1
next prev parent reply other threads:[~2021-05-25 17:33 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-25 17:32 [RFC PATCH v2 00/10] irqchip/irq-gic: Optimize masking by leveraging EOImode=1 Valentin Schneider
2021-05-25 17:32 ` [RFC PATCH v2 01/10] genirq: Add chip flag to denote automatic IRQ (un)masking Valentin Schneider
2021-05-25 17:32 ` [RFC PATCH v2 02/10] genirq: Define irq_ack() and irq_eoi() helpers Valentin Schneider
2021-05-27 10:55 ` Marc Zyngier
2021-05-27 10:58 ` Marc Zyngier
2021-06-01 10:25 ` Valentin Schneider
2021-05-25 17:32 ` [RFC PATCH v2 03/10] genirq: Employ ack_irq() and eoi_irq() where relevant Valentin Schneider
2021-05-25 17:32 ` [RFC PATCH v2 04/10] genirq: Add handle_strict_flow_irq() flow handler Valentin Schneider
2021-05-25 17:32 ` [RFC PATCH v2 05/10] genirq: Let purely flow-masked ONESHOT irqs through unmask_threaded_irq() Valentin Schneider
2021-05-25 17:32 ` [RFC PATCH v2 06/10] genirq: Don't mask IRQ within flow handler if IRQ is flow-masked Valentin Schneider
2021-05-25 17:32 ` [RFC PATCH v2 07/10] genirq, irq-gic-v3: Make NMI flow handlers use ->irq_ack() if available Valentin Schneider
2021-05-25 17:32 ` Valentin Schneider [this message]
2021-05-27 12:17 ` [RFC PATCH v2 08/10] irqchip/gic-v3-its: Use irq_chip_ack_parent() Marc Zyngier
2021-06-01 10:25 ` Valentin Schneider
2021-05-25 17:32 ` [RFC PATCH v2 09/10] irqchip/gic: Convert to handle_strict_flow_irq() Valentin Schneider
2021-05-27 12:21 ` Marc Zyngier
2021-06-01 10:25 ` Valentin Schneider
2021-06-15 15:20 ` Valentin Schneider
2021-05-25 17:32 ` [RFC PATCH v2 10/10] irqchip/gic-v3: " Valentin Schneider
2021-05-25 17:34 ` [RFC PATCH v2 00/10] irqchip/irq-gic: Optimize masking by leveraging EOImode=1 Valentin Schneider
2021-05-27 11:17 ` Marc Zyngier
2021-06-01 10:25 ` Valentin Schneider
2021-06-03 15:32 ` Valentin Schneider
2021-06-08 15:29 ` Marc Zyngier
2021-06-08 17:58 ` Lorenzo Pieralisi
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