linux-kernel - [PATCH 4/9] gpio: thunderx: Convert to immutable irq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 20 Mar 2023 10:55:11 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     linux-gpio@...r.kernel.org, Bartosz Golaszewski <brgl@...ev.pl>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Thorsten Scherer <t.scherer@...elmann.de>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Robert Richter <rric@...nel.org>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>,
        Srinivas Neeli <srinivas.neeli@...inx.com>,
        Michal Simek <michal.simek@...inx.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-unisoc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        Linus Walleij <linus.walleij@...aro.org>,
        Marc Zyngier <maz@...nel.org>
Subject: [PATCH 4/9] gpio: thunderx: Convert to immutable irq_chip

Convert the driver to immutable irq-chip with a bit of
intuition.

Whereas in most cases we put the gpiochip_[enable|disable]_irq()
calls in the .irq_mask() and .irq_unmask() callbacks, here
we need to put them in the .irq_enable() and .irq_disable()
callbacks, as this driver uses both .irq_mask() and
.irq_mask_ack().

Cc: Marc Zyngier <maz@...nel.org>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/gpio/gpio-thunderx.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/drivers/gpio/gpio-thunderx.c b/drivers/gpio/gpio-thunderx.c
index cc62c6e64103..8521c6aacace 100644
--- a/drivers/gpio/gpio-thunderx.c
+++ b/drivers/gpio/gpio-thunderx.c
@@ -354,16 +354,22 @@ static int thunderx_gpio_irq_set_type(struct irq_data *d,
 	return IRQ_SET_MASK_OK;
 }
 
-static void thunderx_gpio_irq_enable(struct irq_data *data)
+static void thunderx_gpio_irq_enable(struct irq_data *d)
 {
-	irq_chip_enable_parent(data);
-	thunderx_gpio_irq_unmask(data);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+
+	gpiochip_enable_irq(gc, irqd_to_hwirq(d));
+	irq_chip_enable_parent(d);
+	thunderx_gpio_irq_unmask(d);
 }
 
-static void thunderx_gpio_irq_disable(struct irq_data *data)
+static void thunderx_gpio_irq_disable(struct irq_data *d)
 {
-	thunderx_gpio_irq_mask(data);
-	irq_chip_disable_parent(data);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+
+	thunderx_gpio_irq_mask(d);
+	irq_chip_disable_parent(d);
+	gpiochip_disable_irq(gc, irqd_to_hwirq(d));
 }
 
 /*
@@ -372,7 +378,7 @@ static void thunderx_gpio_irq_disable(struct irq_data *data)
  * semantics and other acknowledgment tasks associated with the GPIO
  * mechanism.
  */
-static struct irq_chip thunderx_gpio_irq_chip = {
+static const struct irq_chip thunderx_gpio_irq_chip = {
 	.name			= "GPIO",
 	.irq_enable		= thunderx_gpio_irq_enable,
 	.irq_disable		= thunderx_gpio_irq_disable,
@@ -383,8 +389,8 @@ static struct irq_chip thunderx_gpio_irq_chip = {
 	.irq_eoi		= irq_chip_eoi_parent,
 	.irq_set_affinity	= irq_chip_set_affinity_parent,
 	.irq_set_type		= thunderx_gpio_irq_set_type,
-
-	.flags			= IRQCHIP_SET_TYPE_MASKED
+	.flags			= IRQCHIP_SET_TYPE_MASKED | IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static int thunderx_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
@@ -526,7 +532,7 @@ static int thunderx_gpio_probe(struct pci_dev *pdev,
 	chip->set_multiple = thunderx_gpio_set_multiple;
 	chip->set_config = thunderx_gpio_set_config;
 	girq = &chip->irq;
-	girq->chip = &thunderx_gpio_irq_chip;
+	gpio_irq_chip_set_chip(girq, &thunderx_gpio_irq_chip);
 	girq->fwnode = of_node_to_fwnode(dev->of_node);
 	girq->parent_domain =
 		irq_get_irq_data(txgpio->msix_entries[0].vector)->domain;

-- 
2.34.1