[PATCH 1/2] gpiolib: Add irq_set_affinity helper for GPIO line IRQs

[PATCH 1/2] gpiolib: Add irq_set_affinity helper for GPIO line IRQs

[Liang Hao]

GPIO line IRQs need irq_chip->irq_set_affinity so user space can steer
affinity to the upstream controller. Hierarchical domains use
parent_data; chained controllers (parent_handler, no parent_data on the
line) store parent virqs in gpio_irq_chip instead.

Add gpiochip_irq_set_affinity() and GPIOCHIP_IRQ_AFFINITY_HELPERS.
Hierarchical lines delegate via irq_chip_set_affinity_parent().
Chained lines resolve the parent virq and call the parent
irq_chip->irq_set_affinity() directly. Return -EINVAL if the parent
virq cannot be resolved.

Signed-off-by: Liang Hao <haohlliang@gmail.com>
---
 drivers/gpio/gpiolib.c      | 79 +++++++++++++++++++++++++++++++++++++
 include/linux/gpio/driver.h |  5 +++
 2 files changed, 84 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 2987051d9904..0a4626579963 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2104,6 +2104,85 @@ void gpiochip_irq_relres(struct irq_data *d)
 }
 EXPORT_SYMBOL(gpiochip_irq_relres);
 
+static unsigned int gpiochip_chained_parent_virq(struct gpio_chip *gc,
+						 struct irq_data *d)
+{
+	struct gpio_irq_chip *girq = &gc->irq;
+	unsigned int hwirq = irqd_to_hwirq(d);
+	struct irq_desc *desc;
+
+	if (!girq->parent_handler)
+		return 0;
+
+	if (!girq->initialized || !girq->num_parents || !girq->parents)
+		return 0;
+
+	if (girq->num_parents == 1)
+		return girq->parents[0];
+
+	if (girq->map) {
+		if (!gpiochip_irqchip_irq_valid(gc, hwirq))
+			return 0;
+		return girq->map[hwirq];
+	}
+
+	desc = irq_to_desc(d->irq);
+	if (desc && desc->parent_irq)
+		return desc->parent_irq;
+
+	return 0;
+}
+
+/**
+ * gpiochip_irq_set_affinity() - irq_chip set_affinity helper for GPIO lines
+ * @d: Pointer to the GPIO line irq_data
+ * @dest: Affinity mask to set
+ * @force: True to enforce the mask without online CPU checks
+ *
+ * Hierarchical irqdomains with parent_data delegate through
+ * irq_chip_set_affinity_parent(). GPIO irqchips that use a chained parent
+ * handler resolve the parent virq and apply the mask through the parent
+ * irq_chip as described in gpiochip_chained_parent_virq().
+ *
+ * Affinity is programmed on the parent irq, not independently per line. GPIO
+ * lines that share one parent irq also share its affinity; updating one line
+ * replaces the mask for all lines on that parent.
+ *
+ * Return: IRQ_SET_MASK_* on success, or a negative errno on error.
+ */
+int gpiochip_irq_set_affinity(struct irq_data *d,
+			      const struct cpumask *dest, bool force)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct irq_data *pdata;
+	unsigned int parent;
+	int ret;
+
+	if (d->parent_data)
+		return irq_chip_set_affinity_parent(d, dest, force);
+
+	parent = gpiochip_chained_parent_virq(gc, d);
+	if (!parent)
+		return -EINVAL;
+
+	pdata = irq_get_irq_data(parent);
+	if (!pdata || !pdata->chip || !pdata->chip->irq_set_affinity)
+		return -EINVAL;
+
+	ret = pdata->chip->irq_set_affinity(pdata, dest, force);
+	switch (ret) {
+	case IRQ_SET_MASK_OK:
+	case IRQ_SET_MASK_OK_NOCOPY:
+	case IRQ_SET_MASK_OK_DONE:
+		irq_data_update_effective_affinity(d,
+			irq_data_get_effective_affinity_mask(pdata));
+		return IRQ_SET_MASK_OK;
+	default:
+		return ret;
+	}
+}
+EXPORT_SYMBOL_GPL(gpiochip_irq_set_affinity);
+
 static void gpiochip_irq_mask(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 4077dc678cae..a772bf1707aa 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -658,12 +658,17 @@ void gpiochip_enable_irq(struct gpio_chip *gc, unsigned int offset);
 /* irq_data versions of the above */
 int gpiochip_irq_reqres(struct irq_data *data);
 void gpiochip_irq_relres(struct irq_data *data);
+int gpiochip_irq_set_affinity(struct irq_data *data,
+			      const struct cpumask *dest, bool force);
 
 /* Paste this in your irq_chip structure  */
 #define	GPIOCHIP_IRQ_RESOURCE_HELPERS					\
 		.irq_request_resources  = gpiochip_irq_reqres,		\
 		.irq_release_resources  = gpiochip_irq_relres
 
+#define GPIOCHIP_IRQ_AFFINITY_HELPERS					\
+		.irq_set_affinity = gpiochip_irq_set_affinity
+
 static inline void gpio_irq_chip_set_chip(struct gpio_irq_chip *girq,
 					  const struct irq_chip *chip)
 {
-- 
2.54.0 (Apple Git-157)

Re: [PATCH 1/2] gpiolib: Add irq_set_affinity helper for GPIO line IRQs

[kernel test robot]

Hi Liang,

kernel test robot noticed the following build errors:

[auto build test ERROR on brgl/gpio/for-next]
[also build test ERROR on linus/master v7.3 next-20261022]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Liang-Hao/gpiolib-Add-irq_set_affinity-helper-for-GPIO-line-IRQs/20261023-231104
base:   https://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git gpio/for-next
patch link:    https://lore.kernel.org/r/20261023151209.58772-2-haohlliang%40gmail.com
patch subject: [PATCH 1/2] gpiolib: Add irq_set_affinity helper for GPIO line IRQs
config: mips-ci20_defconfig (https://download.01.org/0day-ci/archive/20261024/202610240908.4J3PwdPn-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 186e70f4e6a1521991d2340d3d49b23b1beff11f)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261024/202610240908.4J3PwdPn-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610240908.4J3PwdPn-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/gpio/gpiolib.c:2154:9: error: no member named 'parent_data' in 'struct irq_data'
    2154 |         if (d->parent_data)
         |             ~  ^
>> drivers/gpio/gpiolib.c:2155:10: error: call to undeclared function 'irq_chip_set_affinity_parent'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    2155 |                 return irq_chip_set_affinity_parent(d, dest, force);
         |                        ^
   drivers/gpio/gpiolib.c:2155:10: note: did you mean 'irq_set_affinity_hint'?
   include/linux/interrupt.h:407:19: note: 'irq_set_affinity_hint' declared here
     407 | static inline int irq_set_affinity_hint(unsigned int irq,
         |                   ^
   2 errors generated.


vim +2154 drivers/gpio/gpiolib.c

  2128	
  2129	/**
  2130	 * gpiochip_irq_set_affinity() - irq_chip set_affinity helper for GPIO lines
  2131	 * @d: Pointer to the GPIO line irq_data
  2132	 * @dest: Affinity mask to set
  2133	 * @force: True to enforce the mask without online CPU checks
  2134	 *
  2135	 * Hierarchical irqdomains with parent_data delegate through
  2136	 * irq_chip_set_affinity_parent(). GPIO irqchips that use a chained parent
  2137	 * handler resolve the parent virq and apply the mask through the parent
  2138	 * irq_chip as described in gpiochip_chained_parent_virq().
  2139	 *
  2140	 * Affinity is programmed on the parent irq, not independently per line. GPIO
  2141	 * lines that share one parent irq also share its affinity; updating one line
  2142	 * replaces the mask for all lines on that parent.
  2143	 *
  2144	 * Return: IRQ_SET_MASK_* on success, or a negative errno on error.
  2145	 */
  2146	int gpiochip_irq_set_affinity(struct irq_data *d,
  2147				      const struct cpumask *dest, bool force)
  2148	{
  2149		struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
  2150		struct irq_data *pdata;
  2151		unsigned int parent;
  2152		int ret;
  2153	
> 2154		if (d->parent_data)
> 2155			return irq_chip_set_affinity_parent(d, dest, force);
  2156	
  2157		parent = gpiochip_chained_parent_virq(gc, d);
  2158		if (!parent)
  2159			return -EINVAL;
  2160	
  2161		pdata = irq_get_irq_data(parent);
  2162		if (!pdata || !pdata->chip || !pdata->chip->irq_set_affinity)
  2163			return -EINVAL;
  2164	
  2165		ret = pdata->chip->irq_set_affinity(pdata, dest, force);
  2166		switch (ret) {
  2167		case IRQ_SET_MASK_OK:
  2168		case IRQ_SET_MASK_OK_NOCOPY:
  2169		case IRQ_SET_MASK_OK_DONE:
  2170			irq_data_update_effective_affinity(d,
  2171				irq_data_get_effective_affinity_mask(pdata));
  2172			return IRQ_SET_MASK_OK;
  2173		default:
  2174			return ret;
  2175		}
  2176	}
  2177	EXPORT_SYMBOL_GPL(gpiochip_irq_set_affinity);
  2178	

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH 1/2] gpiolib: Add irq_set_affinity helper for GPIO line IRQs

[kernel test robot]

Hi Liang,

kernel test robot noticed the following build errors:

[auto build test ERROR on brgl/gpio/for-next]
[also build test ERROR on linus/master v7.3 next-20261022]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Liang-Hao/gpiolib-Add-irq_set_affinity-helper-for-GPIO-line-IRQs/20261023-231104
base:   https://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git gpio/for-next
patch link:    https://lore.kernel.org/r/20261023151209.58772-2-haohlliang%40gmail.com
patch subject: [PATCH 1/2] gpiolib: Add irq_set_affinity helper for GPIO line IRQs
config: microblaze-defconfig (https://download.01.org/0day-ci/archive/20261024/202610241003.gRosyohv-lkp@intel.com/config)
compiler: microblaze-linux-gcc (GCC) 16.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261024/202610241003.gRosyohv-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610241003.gRosyohv-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/gpio/gpiolib.c: In function 'gpiochip_irq_set_affinity':
>> drivers/gpio/gpiolib.c:2154:14: error: 'struct irq_data' has no member named 'parent_data'
    2154 |         if (d->parent_data)
         |              ^~
>> drivers/gpio/gpiolib.c:2155:24: error: implicit declaration of function 'irq_chip_set_affinity_parent'; did you mean 'irq_set_affinity_hint'? [-Wimplicit-function-declaration]
    2155 |                 return irq_chip_set_affinity_parent(d, dest, force);
         |                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
         |                        irq_set_affinity_hint


vim +2154 drivers/gpio/gpiolib.c

  2128	
  2129	/**
  2130	 * gpiochip_irq_set_affinity() - irq_chip set_affinity helper for GPIO lines
  2131	 * @d: Pointer to the GPIO line irq_data
  2132	 * @dest: Affinity mask to set
  2133	 * @force: True to enforce the mask without online CPU checks
  2134	 *
  2135	 * Hierarchical irqdomains with parent_data delegate through
  2136	 * irq_chip_set_affinity_parent(). GPIO irqchips that use a chained parent
  2137	 * handler resolve the parent virq and apply the mask through the parent
  2138	 * irq_chip as described in gpiochip_chained_parent_virq().
  2139	 *
  2140	 * Affinity is programmed on the parent irq, not independently per line. GPIO
  2141	 * lines that share one parent irq also share its affinity; updating one line
  2142	 * replaces the mask for all lines on that parent.
  2143	 *
  2144	 * Return: IRQ_SET_MASK_* on success, or a negative errno on error.
  2145	 */
  2146	int gpiochip_irq_set_affinity(struct irq_data *d,
  2147				      const struct cpumask *dest, bool force)
  2148	{
  2149		struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
  2150		struct irq_data *pdata;
  2151		unsigned int parent;
  2152		int ret;
  2153	
> 2154		if (d->parent_data)
> 2155			return irq_chip_set_affinity_parent(d, dest, force);
  2156	
  2157		parent = gpiochip_chained_parent_virq(gc, d);
  2158		if (!parent)
  2159			return -EINVAL;
  2160	
  2161		pdata = irq_get_irq_data(parent);
  2162		if (!pdata || !pdata->chip || !pdata->chip->irq_set_affinity)
  2163			return -EINVAL;
  2164	
  2165		ret = pdata->chip->irq_set_affinity(pdata, dest, force);
  2166		switch (ret) {
  2167		case IRQ_SET_MASK_OK:
  2168		case IRQ_SET_MASK_OK_NOCOPY:
  2169		case IRQ_SET_MASK_OK_DONE:
  2170			irq_data_update_effective_affinity(d,
  2171				irq_data_get_effective_affinity_mask(pdata));
  2172			return IRQ_SET_MASK_OK;
  2173		default:
  2174			return ret;
  2175		}
  2176	}
  2177	EXPORT_SYMBOL_GPL(gpiochip_irq_set_affinity);
  2178	

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

[PATCH 2/2] gpio: dwapb: Use gpiolib irq_set_affinity helper

[Liang Hao]

Wire GPIOCHIP_IRQ_AFFINITY_HELPERS into dwapb_irq_chip.

Signed-off-by: Liang Hao <haohlliang@gmail.com>
---
 drivers/gpio/gpio-dwapb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index aa7c08e60707..9e63c3ecb5b4 100644
--- a/drivers/gpio/gpio-dwapb.c
+++ b/drivers/gpio/gpio-dwapb.c
@@ -412,6 +412,7 @@ static const struct irq_chip dwapb_irq_chip = {
 	.irq_enable	= dwapb_irq_enable,
 	.irq_disable	= dwapb_irq_disable,
 	.irq_set_wake	= pm_sleep_ptr(dwapb_irq_set_wake),
+	GPIOCHIP_IRQ_AFFINITY_HELPERS,
 	.flags		= IRQCHIP_IMMUTABLE,
 	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
-- 
2.54.0 (Apple Git-157)