[v7,08/15] gpio: Move irq_valid_mask into struct gpio_irq_chip

Message ID 20171107181559.6318-9-thierry.reding@gmail.com
State New
Headers show
Series
  • gpio: Tight IRQ chip integration
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Commit Message

Thierry Reding Nov. 7, 2017, 6:15 p.m.
From: Thierry Reding <treding@nvidia.com>

In order to consolidate the multiple ways to associate an IRQ chip with
a GPIO chip, move more fields into the new struct gpio_irq_chip.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 Documentation/gpio/driver.txt              |  4 ++--
 drivers/gpio/gpio-aspeed.c                 |  4 ++--
 drivers/gpio/gpio-stmpe.c                  |  4 ++--
 drivers/gpio/gpiolib.c                     | 16 ++++++++--------
 drivers/pinctrl/intel/pinctrl-baytrail.c   |  4 ++--
 drivers/pinctrl/intel/pinctrl-cherryview.c |  4 ++--
 drivers/platform/x86/intel_int0002_vgpio.c |  4 ++--
 include/linux/gpio/driver.h                | 21 +++++++++++++++------
 8 files changed, 35 insertions(+), 26 deletions(-)

Comments

Grygorii Strashko Nov. 15, 2017, 3:57 p.m. | #1
Hi Thierry, Linus,

On 11/07/2017 12:15 PM, Thierry Reding wrote:
> From: Thierry Reding <treding@nvidia.com>
> 
> In order to consolidate the multiple ways to associate an IRQ chip with
> a GPIO chip, move more fields into the new struct gpio_irq_chip.
> 

I'd like to report possible issue related to irq.valid_mask in case if drivers
which are using it will switch to use gpio_irq_chip and new infra.

Now irq.valid_mask is used the following way:
- gpiochip_add_data() -- It will allocate irq.valid_mask
- driver fills irq.valid_mask if required
- driver calls gpiochip_irqchip_add() which will take into account irq.valid_mask
and prevents mapping of invalid IRQs

With current infra gpio irqchip will be created and initialized from gpiochip_add_data
and drivers have no possibility to fill it before that. 

Again, for now this is "possible issue".

> Signed-off-by: Thierry Reding <treding@nvidia.com>
> ---
>   Documentation/gpio/driver.txt              |  4 ++--
>   drivers/gpio/gpio-aspeed.c                 |  4 ++--
>   drivers/gpio/gpio-stmpe.c                  |  4 ++--
>   drivers/gpio/gpiolib.c                     | 16 ++++++++--------
>   drivers/pinctrl/intel/pinctrl-baytrail.c   |  4 ++--
>   drivers/pinctrl/intel/pinctrl-cherryview.c |  4 ++--
>   drivers/platform/x86/intel_int0002_vgpio.c |  4 ++--
>   include/linux/gpio/driver.h                | 21 +++++++++++++++------
>   8 files changed, 35 insertions(+), 26 deletions(-)
> 
> diff --git a/Documentation/gpio/driver.txt b/Documentation/gpio/driver.txt
> index dcf6af1d9e56..d8de1c7de85a 100644
> --- a/Documentation/gpio/driver.txt
> +++ b/Documentation/gpio/driver.txt
> @@ -313,8 +313,8 @@ symbol:
>     mark all the child IRQs as having the other IRQ as parent.
>   
>   If there is a need to exclude certain GPIOs from the IRQ domain, you can
> -set .irq_need_valid_mask of the gpiochip before gpiochip_add_data() is
> -called. This allocates an .irq_valid_mask with as many bits set as there
> +set .irq.need_valid_mask of the gpiochip before gpiochip_add_data() is
> +called. This allocates an .irq.valid_mask with as many bits set as there
>   are GPIOs in the chip. Drivers can exclude GPIOs by clearing bits from this
>   mask. The mask must be filled in before gpiochip_irqchip_add() or
>   gpiochip_irqchip_add_nested() is called.
> diff --git a/drivers/gpio/gpio-aspeed.c b/drivers/gpio/gpio-aspeed.c

,...

Patch

diff --git a/Documentation/gpio/driver.txt b/Documentation/gpio/driver.txt
index dcf6af1d9e56..d8de1c7de85a 100644
--- a/Documentation/gpio/driver.txt
+++ b/Documentation/gpio/driver.txt
@@ -313,8 +313,8 @@  symbol:
   mark all the child IRQs as having the other IRQ as parent.
 
 If there is a need to exclude certain GPIOs from the IRQ domain, you can
-set .irq_need_valid_mask of the gpiochip before gpiochip_add_data() is
-called. This allocates an .irq_valid_mask with as many bits set as there
+set .irq.need_valid_mask of the gpiochip before gpiochip_add_data() is
+called. This allocates an .irq.valid_mask with as many bits set as there
 are GPIOs in the chip. Drivers can exclude GPIOs by clearing bits from this
 mask. The mask must be filled in before gpiochip_irqchip_add() or
 gpiochip_irqchip_add_nested() is called.
diff --git a/drivers/gpio/gpio-aspeed.c b/drivers/gpio/gpio-aspeed.c
index 988b1b7c4e19..6b3ca6601af2 100644
--- a/drivers/gpio/gpio-aspeed.c
+++ b/drivers/gpio/gpio-aspeed.c
@@ -501,7 +501,7 @@  static void set_irq_valid_mask(struct aspeed_gpio *gpio)
 			if (i >= gpio->config->nr_gpios)
 				break;
 
-			clear_bit(i, gpio->chip.irq_valid_mask);
+			clear_bit(i, gpio->chip.irq.valid_mask);
 		}
 
 		props++;
@@ -856,7 +856,7 @@  static int __init aspeed_gpio_probe(struct platform_device *pdev)
 	gpio->chip.set_config = aspeed_gpio_set_config;
 	gpio->chip.label = dev_name(&pdev->dev);
 	gpio->chip.base = -1;
-	gpio->chip.irq_need_valid_mask = true;
+	gpio->chip.irq.need_valid_mask = true;
 
 	rc = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
 	if (rc < 0)
diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c
index 18d8bef76d85..e6e5cca624a7 100644
--- a/drivers/gpio/gpio-stmpe.c
+++ b/drivers/gpio/gpio-stmpe.c
@@ -451,7 +451,7 @@  static int stmpe_gpio_probe(struct platform_device *pdev)
 	of_property_read_u32(np, "st,norequest-mask",
 			&stmpe_gpio->norequest_mask);
 	if (stmpe_gpio->norequest_mask)
-		stmpe_gpio->chip.irq_need_valid_mask = true;
+		stmpe_gpio->chip.irq.need_valid_mask = true;
 
 	if (irq < 0)
 		dev_info(&pdev->dev,
@@ -482,7 +482,7 @@  static int stmpe_gpio_probe(struct platform_device *pdev)
 			/* Forbid unused lines to be mapped as IRQs */
 			for (i = 0; i < sizeof(u32); i++)
 				if (stmpe_gpio->norequest_mask & BIT(i))
-					clear_bit(i, stmpe_gpio->chip.irq_valid_mask);
+					clear_bit(i, stmpe_gpio->chip.irq.valid_mask);
 		}
 		ret =  gpiochip_irqchip_add_nested(&stmpe_gpio->chip,
 						   &stmpe_gpio_irq_chip,
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 62d6e146dde1..52cb24b16ae3 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1504,33 +1504,33 @@  static struct gpio_chip *find_chip_by_name(const char *name)
 
 static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip)
 {
-	if (!gpiochip->irq_need_valid_mask)
+	if (!gpiochip->irq.need_valid_mask)
 		return 0;
 
-	gpiochip->irq_valid_mask = kcalloc(BITS_TO_LONGS(gpiochip->ngpio),
+	gpiochip->irq.valid_mask = kcalloc(BITS_TO_LONGS(gpiochip->ngpio),
 					   sizeof(long), GFP_KERNEL);
-	if (!gpiochip->irq_valid_mask)
+	if (!gpiochip->irq.valid_mask)
 		return -ENOMEM;
 
 	/* Assume by default all GPIOs are valid */
-	bitmap_fill(gpiochip->irq_valid_mask, gpiochip->ngpio);
+	bitmap_fill(gpiochip->irq.valid_mask, gpiochip->ngpio);
 
 	return 0;
 }
 
 static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip)
 {
-	kfree(gpiochip->irq_valid_mask);
-	gpiochip->irq_valid_mask = NULL;
+	kfree(gpiochip->irq.valid_mask);
+	gpiochip->irq.valid_mask = NULL;
 }
 
 static bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip,
 				       unsigned int offset)
 {
 	/* No mask means all valid */
-	if (likely(!gpiochip->irq_valid_mask))
+	if (likely(!gpiochip->irq.valid_mask))
 		return true;
-	return test_bit(offset, gpiochip->irq_valid_mask);
+	return test_bit(offset, gpiochip->irq.valid_mask);
 }
 
 /**
diff --git a/drivers/pinctrl/intel/pinctrl-baytrail.c b/drivers/pinctrl/intel/pinctrl-baytrail.c
index 5897981e5ed3..9c1ca29c60b7 100644
--- a/drivers/pinctrl/intel/pinctrl-baytrail.c
+++ b/drivers/pinctrl/intel/pinctrl-baytrail.c
@@ -1660,7 +1660,7 @@  static void byt_gpio_irq_init_hw(struct byt_gpio *vg)
 
 		value = readl(reg);
 		if (value & BYT_DIRECT_IRQ_EN) {
-			clear_bit(i, gc->irq_valid_mask);
+			clear_bit(i, gc->irq.valid_mask);
 			dev_dbg(dev, "excluding GPIO %d from IRQ domain\n", i);
 		} else if ((value & BYT_PIN_MUX) == byt_get_gpio_mux(vg, i)) {
 			byt_gpio_clear_triggering(vg, i);
@@ -1703,7 +1703,7 @@  static int byt_gpio_probe(struct byt_gpio *vg)
 	gc->can_sleep	= false;
 	gc->parent	= &vg->pdev->dev;
 	gc->ngpio	= vg->soc_data->npins;
-	gc->irq_need_valid_mask	= true;
+	gc->irq.need_valid_mask	= true;
 
 #ifdef CONFIG_PM_SLEEP
 	vg->saved_context = devm_kcalloc(&vg->pdev->dev, gc->ngpio,
diff --git a/drivers/pinctrl/intel/pinctrl-cherryview.c b/drivers/pinctrl/intel/pinctrl-cherryview.c
index 2d438cb3ae90..bdedb6325c72 100644
--- a/drivers/pinctrl/intel/pinctrl-cherryview.c
+++ b/drivers/pinctrl/intel/pinctrl-cherryview.c
@@ -1585,7 +1585,7 @@  static int chv_gpio_probe(struct chv_pinctrl *pctrl, int irq)
 	chip->label = dev_name(pctrl->dev);
 	chip->parent = pctrl->dev;
 	chip->base = -1;
-	chip->irq_need_valid_mask = need_valid_mask;
+	chip->irq.need_valid_mask = need_valid_mask;
 
 	ret = devm_gpiochip_add_data(pctrl->dev, chip, pctrl);
 	if (ret) {
@@ -1617,7 +1617,7 @@  static int chv_gpio_probe(struct chv_pinctrl *pctrl, int irq)
 		intsel >>= CHV_PADCTRL0_INTSEL_SHIFT;
 
 		if (need_valid_mask && intsel >= pctrl->community->nirqs)
-			clear_bit(i, chip->irq_valid_mask);
+			clear_bit(i, chip->irq.valid_mask);
 	}
 
 	/* Clear all interrupts */
diff --git a/drivers/platform/x86/intel_int0002_vgpio.c b/drivers/platform/x86/intel_int0002_vgpio.c
index f6b3af73dea5..f7b67e898abc 100644
--- a/drivers/platform/x86/intel_int0002_vgpio.c
+++ b/drivers/platform/x86/intel_int0002_vgpio.c
@@ -165,7 +165,7 @@  static int int0002_probe(struct platform_device *pdev)
 	chip->direction_output = int0002_gpio_direction_output;
 	chip->base = -1;
 	chip->ngpio = GPE0A_PME_B0_VIRT_GPIO_PIN + 1;
-	chip->irq_need_valid_mask = true;
+	chip->irq.need_valid_mask = true;
 
 	ret = devm_gpiochip_add_data(&pdev->dev, chip, NULL);
 	if (ret) {
@@ -173,7 +173,7 @@  static int int0002_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	bitmap_clear(chip->irq_valid_mask, 0, GPE0A_PME_B0_VIRT_GPIO_PIN);
+	bitmap_clear(chip->irq.valid_mask, 0, GPE0A_PME_B0_VIRT_GPIO_PIN);
 
 	/*
 	 * We manually request the irq here instead of passing a flow-handler
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 23f9feb266cf..243c8b585160 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -100,6 +100,21 @@  struct gpio_irq_chip {
 	 * True if set the interrupt handling is nested.
 	 */
 	bool nested;
+
+	/**
+	 * @need_valid_mask:
+	 *
+	 * If set core allocates @valid_mask with all bits set to one.
+	 */
+	bool need_valid_mask;
+
+	/**
+	 * @valid_mask:
+	 *
+	 * If not %NULL holds bitmask of GPIOs which are valid to be included
+	 * in IRQ domain of the chip.
+	 */
+	unsigned long *valid_mask;
 };
 
 static inline struct gpio_irq_chip *to_gpio_irq_chip(struct irq_chip *chip)
@@ -171,10 +186,6 @@  static inline struct gpio_irq_chip *to_gpio_irq_chip(struct irq_chip *chip)
  *	safely.
  * @bgpio_dir: shadowed direction register for generic GPIO to clear/set
  *	direction safely.
- * @irq_need_valid_mask: If set core allocates @irq_valid_mask with all
- *	bits set to one
- * @irq_valid_mask: If not %NULL holds bitmask of GPIOs which are valid to
- *	be included in IRQ domain of the chip
  * @lock_key: per GPIO IRQ chip lockdep class
  *
  * A gpio_chip can help platforms abstract various sources of GPIOs so
@@ -245,8 +256,6 @@  struct gpio_chip {
 	 * With CONFIG_GPIOLIB_IRQCHIP we get an irqchip inside the gpiolib
 	 * to handle IRQs for most practical cases.
 	 */
-	bool			irq_need_valid_mask;
-	unsigned long		*irq_valid_mask;
 	struct lock_class_key	*lock_key;
 
 	/**