| Message ID | 20230215-immutable-chips-v1-15-51a8f224a5d0@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Mass convert GPIO IRQ chips to be immutable | expand |
Hi, * Linus Walleij <linus.walleij@linaro.org> [230216 09:38]: > Convert the driver to immutable irq-chip with a bit of > intuition. > > This driver require some special care: .irq_ack() was copied > from dummy_irq_chip where it was defined as noop. This only > makes sense if using handle_edge_irq() that will unconditionally > call .irq_ack() to avoid a crash, but this driver is not ever > using handle_edge_irq() so just avoid assigning .irq_ack(). > > A separate chip had to be created for the non-wakeup instance. Nice, works for me. BTW, I still see these warnings remaining on boot: gpio gpiochip0: Static allocation of GPIO base is deprecated, use dynamic allocation. Seems like we might be able to get rid of those too now or are there still some dependencies with /sys/class/gpio for example? Reviewed-by: Tony Lindgren <tony@atomide.com> Tested-by: Tony Lindgren <tony@atomide.com>
On Fri, 17 Feb 2023 09:49:37 +0200 Tony Lindgren <tony@atomide.com> wrote: > Hi, > > * Linus Walleij <linus.walleij@linaro.org> [230216 09:38]: > > Convert the driver to immutable irq-chip with a bit of > > intuition. > > > > This driver require some special care: .irq_ack() was copied > > from dummy_irq_chip where it was defined as noop. This only > > makes sense if using handle_edge_irq() that will unconditionally > > call .irq_ack() to avoid a crash, but this driver is not ever > > using handle_edge_irq() so just avoid assigning .irq_ack(). > > > > A separate chip had to be created for the non-wakeup instance. > > Nice, works for me. > > BTW, I still see these warnings remaining on boot: > > gpio gpiochip0: Static allocation of GPIO base is deprecated, use dynamic allocation. > > Seems like we might be able to get rid of those too now or are > there still some dependencies with /sys/class/gpio for example? > on what are you testing? on -next? I thought I have fixed theese warning with https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=92bf78b33b0b463b00c6b0203b49aea845daecc8 Regards, Andreas
* Andreas Kemnade <andreas@kemnade.info> [230217 16:31]: > On Fri, 17 Feb 2023 09:49:37 +0200 > Tony Lindgren <tony@atomide.com> wrote: > > > Hi, > > > > * Linus Walleij <linus.walleij@linaro.org> [230216 09:38]: > > > Convert the driver to immutable irq-chip with a bit of > > > intuition. > > > > > > This driver require some special care: .irq_ack() was copied > > > from dummy_irq_chip where it was defined as noop. This only > > > makes sense if using handle_edge_irq() that will unconditionally > > > call .irq_ack() to avoid a crash, but this driver is not ever > > > using handle_edge_irq() so just avoid assigning .irq_ack(). > > > > > > A separate chip had to be created for the non-wakeup instance. > > > > Nice, works for me. > > > > BTW, I still see these warnings remaining on boot: > > > > gpio gpiochip0: Static allocation of GPIO base is deprecated, use dynamic allocation. > > > > Seems like we might be able to get rid of those too now or are > > there still some dependencies with /sys/class/gpio for example? > > > on what are you testing? on -next? I thought I have fixed theese warning with > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=92bf78b33b0b463b00c6b0203b49aea845daecc8 You're right, sorry looks like I pasted the wrong line from the dmesg output :) I intended to paste this example instead of the static allocation line: gpio gpiochip1: (gpio-32-63): not an immutable chip, please consider fixing it! Regards, Tony
* Tony Lindgren <tony@atomide.com> [230306 07:28]: > * Andreas Kemnade <andreas@kemnade.info> [230217 16:31]: > > On Fri, 17 Feb 2023 09:49:37 +0200 > > Tony Lindgren <tony@atomide.com> wrote: > > > > > Hi, > > > > > > * Linus Walleij <linus.walleij@linaro.org> [230216 09:38]: > > > > Convert the driver to immutable irq-chip with a bit of > > > > intuition. > > > > > > > > This driver require some special care: .irq_ack() was copied > > > > from dummy_irq_chip where it was defined as noop. This only > > > > makes sense if using handle_edge_irq() that will unconditionally > > > > call .irq_ack() to avoid a crash, but this driver is not ever > > > > using handle_edge_irq() so just avoid assigning .irq_ack(). > > > > > > > > A separate chip had to be created for the non-wakeup instance. > > > > > > Nice, works for me. > > > > > > BTW, I still see these warnings remaining on boot: > > > > > > gpio gpiochip0: Static allocation of GPIO base is deprecated, use dynamic allocation. > > > > > > Seems like we might be able to get rid of those too now or are > > > there still some dependencies with /sys/class/gpio for example? > > > > > on what are you testing? on -next? I thought I have fixed theese warning with > > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=92bf78b33b0b463b00c6b0203b49aea845daecc8 > > You're right, sorry looks like I pasted the wrong line from the dmesg > output :) > > I intended to paste this example instead of the static allocation line: > > gpio gpiochip1: (gpio-32-63): not an immutable chip, please consider fixing it! Hmm, nope, sorry it seems I was just confused between two patches. Hopefully all the gpio warnings will be gone with this $subject patch applied. Regards, Tony
diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c index 292e62c06008..a5ee3ed31533 100644 --- a/drivers/gpio/gpio-omap.c +++ b/drivers/gpio/gpio-omap.c @@ -12,6 +12,7 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/interrupt.h> +#include <linux/seq_file.h> #include <linux/syscore_ops.h> #include <linux/err.h> #include <linux/clk.h> @@ -47,6 +48,7 @@ struct gpio_regs { struct gpio_bank { void __iomem *base; const struct omap_gpio_reg_offs *regs; + struct device *dev; int irq; u32 non_wakeup_gpios; @@ -681,6 +683,7 @@ static void omap_gpio_mask_irq(struct irq_data *d) omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE); omap_set_gpio_irqenable(bank, offset, 0); raw_spin_unlock_irqrestore(&bank->lock, flags); + gpiochip_disable_irq(&bank->chip, offset); } static void omap_gpio_unmask_irq(struct irq_data *d) @@ -690,6 +693,7 @@ static void omap_gpio_unmask_irq(struct irq_data *d) u32 trigger = irqd_get_trigger_type(d); unsigned long flags; + gpiochip_enable_irq(&bank->chip, offset); raw_spin_lock_irqsave(&bank->lock, flags); omap_set_gpio_irqenable(bank, offset, 1); @@ -708,6 +712,40 @@ static void omap_gpio_unmask_irq(struct irq_data *d) raw_spin_unlock_irqrestore(&bank->lock, flags); } +static void omap_gpio_irq_print_chip(struct irq_data *d, struct seq_file *p) +{ + struct gpio_bank *bank = omap_irq_data_get_bank(d); + + seq_printf(p, dev_name(bank->dev)); +} + +static const struct irq_chip omap_gpio_irq_chip = { + .irq_startup = omap_gpio_irq_startup, + .irq_shutdown = omap_gpio_irq_shutdown, + .irq_mask = omap_gpio_mask_irq, + .irq_unmask = omap_gpio_unmask_irq, + .irq_set_type = omap_gpio_irq_type, + .irq_set_wake = omap_gpio_wake_enable, + .irq_bus_lock = omap_gpio_irq_bus_lock, + .irq_bus_sync_unlock = gpio_irq_bus_sync_unlock, + .irq_print_chip = omap_gpio_irq_print_chip, + .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE, + GPIOCHIP_IRQ_RESOURCE_HELPERS, +}; + +static const struct irq_chip omap_gpio_irq_chip_nowake = { + .irq_startup = omap_gpio_irq_startup, + .irq_shutdown = omap_gpio_irq_shutdown, + .irq_mask = omap_gpio_mask_irq, + .irq_unmask = omap_gpio_unmask_irq, + .irq_set_type = omap_gpio_irq_type, + .irq_bus_lock = omap_gpio_irq_bus_lock, + .irq_bus_sync_unlock = gpio_irq_bus_sync_unlock, + .irq_print_chip = omap_gpio_irq_print_chip, + .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE, + GPIOCHIP_IRQ_RESOURCE_HELPERS, +}; + /*---------------------------------------------------------------------*/ static int omap_mpuio_suspend_noirq(struct device *dev) @@ -986,8 +1024,7 @@ static void omap_gpio_mod_init(struct gpio_bank *bank) writel_relaxed(0, base + bank->regs->ctrl); } -static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc, - struct device *pm_dev) +static int omap_gpio_chip_init(struct gpio_bank *bank, struct device *pm_dev) { struct gpio_irq_chip *irq; static int gpio; @@ -1023,12 +1060,12 @@ static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc, } bank->chip.ngpio = bank->width; + irq = &bank->chip.irq; /* MPUIO is a bit different, reading IRQ status clears it */ if (bank->is_mpuio && !bank->regs->wkup_en) - irqc->irq_set_wake = NULL; - - irq = &bank->chip.irq; - irq->chip = irqc; + gpio_irq_chip_set_chip(irq, &omap_gpio_irq_chip_nowake); + else + gpio_irq_chip_set_chip(irq, &omap_gpio_irq_chip); irq->handler = handle_bad_irq; irq->default_type = IRQ_TYPE_NONE; irq->num_parents = 1; @@ -1361,7 +1398,6 @@ static int omap_gpio_probe(struct platform_device *pdev) struct device_node *node = dev->of_node; const struct omap_gpio_platform_data *pdata; struct gpio_bank *bank; - struct irq_chip *irqc; int ret; pdata = device_get_match_data(dev); @@ -1374,21 +1410,7 @@ static int omap_gpio_probe(struct platform_device *pdev) if (!bank) return -ENOMEM; - irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL); - if (!irqc) - return -ENOMEM; - - irqc->irq_startup = omap_gpio_irq_startup, - irqc->irq_shutdown = omap_gpio_irq_shutdown, - irqc->irq_ack = dummy_irq_chip.irq_ack, - irqc->irq_mask = omap_gpio_mask_irq, - irqc->irq_unmask = omap_gpio_unmask_irq, - irqc->irq_set_type = omap_gpio_irq_type, - irqc->irq_set_wake = omap_gpio_wake_enable, - irqc->irq_bus_lock = omap_gpio_irq_bus_lock, - irqc->irq_bus_sync_unlock = gpio_irq_bus_sync_unlock, - irqc->name = dev_name(&pdev->dev); - irqc->flags = IRQCHIP_MASK_ON_SUSPEND; + bank->dev = dev; bank->irq = platform_get_irq(pdev, 0); if (bank->irq <= 0) { @@ -1452,7 +1474,7 @@ static int omap_gpio_probe(struct platform_device *pdev) omap_gpio_mod_init(bank); - ret = omap_gpio_chip_init(bank, irqc, dev); + ret = omap_gpio_chip_init(bank, dev); if (ret) { pm_runtime_put_sync(dev); pm_runtime_disable(dev);
Convert the driver to immutable irq-chip with a bit of intuition. This driver require some special care: .irq_ack() was copied from dummy_irq_chip where it was defined as noop. This only makes sense if using handle_edge_irq() that will unconditionally call .irq_ack() to avoid a crash, but this driver is not ever using handle_edge_irq() so just avoid assigning .irq_ack(). A separate chip had to be created for the non-wakeup instance. Cc: Marc Zyngier <maz@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> --- drivers/gpio/gpio-omap.c | 68 ++++++++++++++++++++++++++++++++---------------- 1 file changed, 45 insertions(+), 23 deletions(-)