From: Marc Zyngier <maz@kernel.org> To: linux-kernel@vger.kernel.org Cc: Linus Walleij <linus.walleij@linaro.org>, Bartosz Golaszewski <brgl@bgdev.pl>, Thierry Reding <thierry.reding@gmail.com>, Joey Gouly <joey.gouly@arm.com>, Jonathan Hunter <jonathanh@nvidia.com>, Hector Martin <marcan@marcan.st>, Sven Peter <sven@svenpeter.dev>, Alyssa Rosenzweig <alyssa@rosenzweig.io>, Bjorn Andersson <bjorn.andersson@linaro.org>, Andy Gross <agross@kernel.org>, Thomas Gleixner <tglx@linutronix.de>, linux-gpio@vger.kernel.org, linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, kernel-team@android.com Subject: [PATCH 1/5] gpio: Don't fiddle with irqchips marked as immutable Date: Wed, 23 Feb 2022 15:44:01 +0000 [thread overview] Message-ID: <20220223154405.54912-2-maz@kernel.org> (raw) In-Reply-To: <20220223154405.54912-1-maz@kernel.org> In order to move away from gpiolib messing with the internals of unsuspecting irqchips, add a flag by which irqchips advertise that they are not to be messed with, and do solemnly swear that they correctly call into the gpiolib helpers wueh required. Signed-off-by: Marc Zyngier <maz@kernel.org> --- drivers/gpio/gpiolib.c | 7 ++++++- include/linux/irq.h | 2 ++ kernel/irq/debugfs.c | 1 + 3 files changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 3859911b61e9..515838708b00 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1475,6 +1475,11 @@ static void gpiochip_set_irq_hooks(struct gpio_chip *gc) { struct irq_chip *irqchip = gc->irq.chip; + if (irqchip->flags & IRQCHIP_IMMUTABLE) { + chip_info(gc, "Immutable chip, not updating\n"); + return; + } + if (!irqchip->irq_request_resources && !irqchip->irq_release_resources) { irqchip->irq_request_resources = gpiochip_irq_reqres; @@ -1633,7 +1638,7 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gc) irq_domain_remove(gc->irq.domain); } - if (irqchip) { + if (irqchip && !(irqchip->flags & IRQCHIP_IMMUTABLE)) { if (irqchip->irq_request_resources == gpiochip_irq_reqres) { irqchip->irq_request_resources = NULL; irqchip->irq_release_resources = NULL; diff --git a/include/linux/irq.h b/include/linux/irq.h index f92788ccdba2..505308253d23 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -569,6 +569,7 @@ struct irq_chip { * IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND: Invokes __enable_irq()/__disable_irq() for wake irqs * in the suspend path if they are in disabled state * IRQCHIP_AFFINITY_PRE_STARTUP: Default affinity update before startup + * IRQCHIP_IMMUTABLE: Don't ever change anything in this chip */ enum { IRQCHIP_SET_TYPE_MASKED = (1 << 0), @@ -582,6 +583,7 @@ enum { IRQCHIP_SUPPORTS_NMI = (1 << 8), IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND = (1 << 9), IRQCHIP_AFFINITY_PRE_STARTUP = (1 << 10), + IRQCHIP_IMMUTABLE = (1 << 11), }; #include <linux/irqdesc.h> diff --git a/kernel/irq/debugfs.c b/kernel/irq/debugfs.c index 2b43f5f5033d..bc8e40cf2b65 100644 --- a/kernel/irq/debugfs.c +++ b/kernel/irq/debugfs.c @@ -58,6 +58,7 @@ static const struct irq_bit_descr irqchip_flags[] = { BIT_MASK_DESCR(IRQCHIP_SUPPORTS_LEVEL_MSI), BIT_MASK_DESCR(IRQCHIP_SUPPORTS_NMI), BIT_MASK_DESCR(IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND), + BIT_MASK_DESCR(IRQCHIP_IMMUTABLE), }; static void -- 2.30.2
WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org> To: linux-kernel@vger.kernel.org Cc: Linus Walleij <linus.walleij@linaro.org>, Bartosz Golaszewski <brgl@bgdev.pl>, Thierry Reding <thierry.reding@gmail.com>, Joey Gouly <joey.gouly@arm.com>, Jonathan Hunter <jonathanh@nvidia.com>, Hector Martin <marcan@marcan.st>, Sven Peter <sven@svenpeter.dev>, Alyssa Rosenzweig <alyssa@rosenzweig.io>, Bjorn Andersson <bjorn.andersson@linaro.org>, Andy Gross <agross@kernel.org>, Thomas Gleixner <tglx@linutronix.de>, linux-gpio@vger.kernel.org, linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, kernel-team@android.com Subject: [PATCH 1/5] gpio: Don't fiddle with irqchips marked as immutable Date: Wed, 23 Feb 2022 15:44:01 +0000 [thread overview] Message-ID: <20220223154405.54912-2-maz@kernel.org> (raw) In-Reply-To: <20220223154405.54912-1-maz@kernel.org> In order to move away from gpiolib messing with the internals of unsuspecting irqchips, add a flag by which irqchips advertise that they are not to be messed with, and do solemnly swear that they correctly call into the gpiolib helpers wueh required. Signed-off-by: Marc Zyngier <maz@kernel.org> --- drivers/gpio/gpiolib.c | 7 ++++++- include/linux/irq.h | 2 ++ kernel/irq/debugfs.c | 1 + 3 files changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 3859911b61e9..515838708b00 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1475,6 +1475,11 @@ static void gpiochip_set_irq_hooks(struct gpio_chip *gc) { struct irq_chip *irqchip = gc->irq.chip; + if (irqchip->flags & IRQCHIP_IMMUTABLE) { + chip_info(gc, "Immutable chip, not updating\n"); + return; + } + if (!irqchip->irq_request_resources && !irqchip->irq_release_resources) { irqchip->irq_request_resources = gpiochip_irq_reqres; @@ -1633,7 +1638,7 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gc) irq_domain_remove(gc->irq.domain); } - if (irqchip) { + if (irqchip && !(irqchip->flags & IRQCHIP_IMMUTABLE)) { if (irqchip->irq_request_resources == gpiochip_irq_reqres) { irqchip->irq_request_resources = NULL; irqchip->irq_release_resources = NULL; diff --git a/include/linux/irq.h b/include/linux/irq.h index f92788ccdba2..505308253d23 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -569,6 +569,7 @@ struct irq_chip { * IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND: Invokes __enable_irq()/__disable_irq() for wake irqs * in the suspend path if they are in disabled state * IRQCHIP_AFFINITY_PRE_STARTUP: Default affinity update before startup + * IRQCHIP_IMMUTABLE: Don't ever change anything in this chip */ enum { IRQCHIP_SET_TYPE_MASKED = (1 << 0), @@ -582,6 +583,7 @@ enum { IRQCHIP_SUPPORTS_NMI = (1 << 8), IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND = (1 << 9), IRQCHIP_AFFINITY_PRE_STARTUP = (1 << 10), + IRQCHIP_IMMUTABLE = (1 << 11), }; #include <linux/irqdesc.h> diff --git a/kernel/irq/debugfs.c b/kernel/irq/debugfs.c index 2b43f5f5033d..bc8e40cf2b65 100644 --- a/kernel/irq/debugfs.c +++ b/kernel/irq/debugfs.c @@ -58,6 +58,7 @@ static const struct irq_bit_descr irqchip_flags[] = { BIT_MASK_DESCR(IRQCHIP_SUPPORTS_LEVEL_MSI), BIT_MASK_DESCR(IRQCHIP_SUPPORTS_NMI), BIT_MASK_DESCR(IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND), + BIT_MASK_DESCR(IRQCHIP_IMMUTABLE), }; static void -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-02-23 15:44 UTC|newest] Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-02-23 15:44 [PATCH 0/5] gpiolib: Handle immutable irq_chip structures Marc Zyngier 2022-02-23 15:44 ` Marc Zyngier 2022-02-23 15:44 ` Marc Zyngier [this message] 2022-02-23 15:44 ` [PATCH 1/5] gpio: Don't fiddle with irqchips marked as immutable Marc Zyngier 2022-02-23 17:48 ` Jeffrey Hugo 2022-02-23 17:48 ` Jeffrey Hugo 2022-02-23 18:14 ` Marc Zyngier 2022-02-23 18:14 ` Marc Zyngier 2022-02-24 16:51 ` Thierry Reding 2022-02-24 16:51 ` Thierry Reding 2022-02-26 10:32 ` Marc Zyngier 2022-02-26 10:32 ` Marc Zyngier 2022-02-23 15:44 ` [PATCH 2/5] gpio: Expose the gpiochip_irq_re[ql]res helpers Marc Zyngier 2022-02-23 15:44 ` Marc Zyngier 2022-02-23 15:44 ` [PATCH 3/5] pinctrl: apple-gpio: Make the irqchip immutable Marc Zyngier 2022-02-23 15:44 ` Marc Zyngier 2022-02-23 15:44 ` [PATCH 4/5] pinctrl: msmgpio: " Marc Zyngier 2022-02-23 15:44 ` Marc Zyngier 2022-02-23 15:44 ` [PATCH 5/5] gpio: tegra186: " Marc Zyngier 2022-02-23 15:44 ` Marc Zyngier 2022-02-24 16:40 ` [PATCH 0/5] gpiolib: Handle immutable irq_chip structures Thierry Reding 2022-02-24 16:40 ` Thierry Reding 2022-02-24 17:42 ` Marc Zyngier 2022-02-24 17:42 ` Marc Zyngier 2022-03-04 17:19 ` Marc Zyngier 2022-03-04 17:19 ` Marc Zyngier 2022-03-15 0:44 ` Linus Walleij 2022-03-15 0:44 ` Linus Walleij 2022-03-15 9:35 ` Marc Zyngier 2022-03-15 9:35 ` Marc Zyngier 2022-03-24 22:30 ` Linus Walleij 2022-03-24 22:30 ` Linus Walleij
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