From d245b3f9bd36f02fd641cba9931d8b4c77126e74 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Thu, 24 Nov 2016 10:57:25 +0100 Subject: [PATCH] gpio: simplify adding threaded interrupts This tries to simplify the use of CONFIG_GPIOLIB_IRQCHIP when using threaded interrupts: add a new call gpiochip_irqchip_add_nested() to indicate that we're dealing with a nested rather than a chained irqchip, then create a separate gpiochip_set_nested_irqchip() to mirror the gpiochip_set_chained_irqchip() call to connect the parent and child interrupts. In the nested case gpiochip_set_nested_irqchip() does nothing more than call irq_set_parent() on each valid child interrupt, which has little semantic effect in the kernel, but this is probably still formally correct. Update all drivers using nested interrupts to use gpiochip_irqchip_add_nested() so we can now see clearly which these users are. The DLN2 driver can drop its specific hack with .irq_not_threaded as we now recognize whether a chip is threaded or not from its use of gpiochip_irqchip_add_nested() signature rather than from inspecting .can_sleep. We rename the .irq_parent to .irq_chained_parent since this parent IRQ is only really kept around for the chained interrupt handlers. Cc: Lars Poeschel Cc: Octavian Purdila Cc: Daniel Baluta Cc: Bin Gao Cc: Mika Westerberg Cc: Ajay Thomas Cc: Semen Protsenko Cc: Alexander Stein Cc: Phil Reid Cc: Bartosz Golaszewski Cc: Patrice Chotard Signed-off-by: Linus Walleij --- Documentation/gpio/driver.txt | 62 ++++++++++++++++------------- drivers/gpio/gpio-adnp.c | 10 ++--- drivers/gpio/gpio-crystalcove.c | 4 +- drivers/gpio/gpio-dln2.c | 1 - drivers/gpio/gpio-max732x.c | 17 ++++---- drivers/gpio/gpio-mcp23s08.c | 17 ++++---- drivers/gpio/gpio-pca953x.c | 16 ++++---- drivers/gpio/gpio-pcf857x.c | 11 +++--- drivers/gpio/gpio-stmpe.c | 17 ++++---- drivers/gpio/gpio-tc3589x.c | 17 ++++---- drivers/gpio/gpio-wcove.c | 4 +- drivers/gpio/gpiolib.c | 69 ++++++++++++++++++++++++++------- include/linux/gpio/driver.h | 32 +++++++++++---- 13 files changed, 171 insertions(+), 106 deletions(-) diff --git a/Documentation/gpio/driver.txt b/Documentation/gpio/driver.txt index 368d5a294d89..747c721776ed 100644 --- a/Documentation/gpio/driver.txt +++ b/Documentation/gpio/driver.txt @@ -175,8 +175,8 @@ The IRQ portions of the GPIO block are implemented using an irqchip, using the header . So basically such a driver is utilizing two sub- systems simultaneously: gpio and irq. -RT_FULL: GPIO driver should not use spinlock_t or any sleepable APIs -(like PM runtime) as part of its irq_chip implementation on -RT. +RT_FULL: a realtime compliant GPIO driver should not use spinlock_t or any +sleepable APIs (like PM runtime) as part of its irq_chip implementation. - spinlock_t should be replaced with raw_spinlock_t [1]. - If sleepable APIs have to be used, these can be done from the .irq_bus_lock() and .irq_bus_unlock() callbacks, as these are the only slowpath callbacks @@ -185,33 +185,32 @@ RT_FULL: GPIO driver should not use spinlock_t or any sleepable APIs GPIO irqchips usually fall in one of two categories: * CHAINED GPIO irqchips: these are usually the type that is embedded on - an SoC. This means that there is a fast IRQ handler for the GPIOs that + an SoC. This means that there is a fast IRQ flow handler for the GPIOs that gets called in a chain from the parent IRQ handler, most typically the - system interrupt controller. This means the GPIO irqchip is registered - using irq_set_chained_handler() or the corresponding - gpiochip_set_chained_irqchip() helper function, and the GPIO irqchip - handler will be called immediately from the parent irqchip, while - holding the IRQs disabled. The GPIO irqchip will then end up calling - something like this sequence in its interrupt handler: - - static irqreturn_t tc3589x_gpio_irq(int irq, void *data) + system interrupt controller. This means that the GPIO irqchip handler will + be called immediately from the parent irqchip, while holding the IRQs + disabled. The GPIO irqchip will then end up calling something like this + sequence in its interrupt handler: + + static irqreturn_t foo_gpio_irq(int irq, void *data) chained_irq_enter(...); generic_handle_irq(...); chained_irq_exit(...); Chained GPIO irqchips typically can NOT set the .can_sleep flag on - struct gpio_chip, as everything happens directly in the callbacks. + struct gpio_chip, as everything happens directly in the callbacks: no + slow bus traffic like I2C can be used. RT_FULL: Note, chained IRQ handlers will not be forced threaded on -RT. As result, spinlock_t or any sleepable APIs (like PM runtime) can't be used in chained IRQ handler. - if required (and if it can't be converted to the nested threaded GPIO irqchip) - - chained IRQ handler can be converted to generic irq handler and this way - it will be threaded IRQ handler on -RT and hard IRQ handler on non-RT + If required (and if it can't be converted to the nested threaded GPIO irqchip) + a chained IRQ handler can be converted to generic irq handler and this way + it will be a threaded IRQ handler on -RT and a hard IRQ handler on non-RT (for example, see [3]). Know W/A: The generic_handle_irq() is expected to be called with IRQ disabled, - so IRQ core will complain if it will be called from IRQ handler which is - forced thread. The "fake?" raw lock can be used to W/A this problem: + so the IRQ core will complain if it is called from an IRQ handler which is + forced to a thread. The "fake?" raw lock can be used to W/A this problem: raw_spinlock_t wa_lock; static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank) @@ -243,7 +242,7 @@ GPIO irqchips usually fall in one of two categories: by the driver. The hallmark of this driver is to call something like this in its interrupt handler: - static irqreturn_t tc3589x_gpio_irq(int irq, void *data) + static irqreturn_t foo_gpio_irq(int irq, void *data) ... handle_nested_irq(irq); @@ -256,23 +255,31 @@ associated irqdomain and resource allocation callbacks, the gpiolib has some helpers that can be enabled by selecting the GPIOLIB_IRQCHIP Kconfig symbol: -* gpiochip_irqchip_add(): adds an irqchip to a gpiochip. It will pass +* gpiochip_irqchip_add(): adds a chained irqchip to a gpiochip. It will pass the struct gpio_chip* for the chip to all IRQ callbacks, so the callbacks need to embed the gpio_chip in its state container and obtain a pointer to the container using container_of(). (See Documentation/driver-model/design-patterns.txt) - If there is a need to exclude certain GPIOs from the IRQ domain, one can - set .irq_need_valid_mask of the gpiochip before gpiochip_add_data() is - called. This allocates .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() is called. +* gpiochip_irqchip_add_nested(): adds a nested irqchip to a gpiochip. + Apart from that it works exactly like the chained irqchip. * gpiochip_set_chained_irqchip(): sets up a chained irq handler for a gpio_chip from a parent IRQ and passes the struct gpio_chip* as handler data. (Notice handler data, since the irqchip data is likely used by the - parent irqchip!) This is for the chained type of chip. This is also used - to set up a nested irqchip if NULL is passed as handler. + parent irqchip!). + +* gpiochip_set_nested_irqchip(): sets up a nested irq handler for a + gpio_chip from a parent IRQ. As the parent IRQ has usually been + explicitly requested by the driver, this does very little more than + 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 +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. To use the helpers please keep the following in mind: @@ -323,6 +330,9 @@ When implementing an irqchip inside a GPIO driver, these two functions should typically be called in the .startup() and .shutdown() callbacks from the irqchip. +When using the gpiolib irqchip helpers, these callback are automatically +assigned. + Real-Time compliance for GPIO IRQ chips --------------------------------------- diff --git a/drivers/gpio/gpio-adnp.c b/drivers/gpio/gpio-adnp.c index 8ff7b0d3eac6..7a5c0a93e1ff 100644 --- a/drivers/gpio/gpio-adnp.c +++ b/drivers/gpio/gpio-adnp.c @@ -468,11 +468,11 @@ static int adnp_irq_setup(struct adnp *adnp) return err; } - err = gpiochip_irqchip_add(chip, - &adnp_irq_chip, - 0, - handle_simple_irq, - IRQ_TYPE_NONE); + err = gpiochip_irqchip_add_nested(chip, + &adnp_irq_chip, + 0, + handle_simple_irq, + IRQ_TYPE_NONE); if (err) { dev_err(chip->parent, "could not connect irqchip to gpiochip\n"); diff --git a/drivers/gpio/gpio-crystalcove.c b/drivers/gpio/gpio-crystalcove.c index 7c446d118cd6..d0022d655a09 100644 --- a/drivers/gpio/gpio-crystalcove.c +++ b/drivers/gpio/gpio-crystalcove.c @@ -351,8 +351,8 @@ static int crystalcove_gpio_probe(struct platform_device *pdev) return retval; } - gpiochip_irqchip_add(&cg->chip, &crystalcove_irqchip, 0, - handle_simple_irq, IRQ_TYPE_NONE); + gpiochip_irqchip_add_nested(&cg->chip, &crystalcove_irqchip, 0, + handle_simple_irq, IRQ_TYPE_NONE); retval = request_threaded_irq(irq, NULL, crystalcove_gpio_irq_handler, IRQF_ONESHOT, KBUILD_MODNAME, cg); diff --git a/drivers/gpio/gpio-dln2.c b/drivers/gpio/gpio-dln2.c index f7a60a441e95..5d38b08d1ee2 100644 --- a/drivers/gpio/gpio-dln2.c +++ b/drivers/gpio/gpio-dln2.c @@ -467,7 +467,6 @@ static int dln2_gpio_probe(struct platform_device *pdev) dln2->gpio.base = -1; dln2->gpio.ngpio = pins; dln2->gpio.can_sleep = true; - dln2->gpio.irq_not_threaded = true; dln2->gpio.set = dln2_gpio_set; dln2->gpio.get = dln2_gpio_get; dln2->gpio.request = dln2_gpio_request; diff --git a/drivers/gpio/gpio-max732x.c b/drivers/gpio/gpio-max732x.c index a9aaf9d822b4..4ea4c6a1313b 100644 --- a/drivers/gpio/gpio-max732x.c +++ b/drivers/gpio/gpio-max732x.c @@ -520,20 +520,19 @@ static int max732x_irq_setup(struct max732x_chip *chip, client->irq); return ret; } - ret = gpiochip_irqchip_add(&chip->gpio_chip, - &max732x_irq_chip, - irq_base, - handle_simple_irq, - IRQ_TYPE_NONE); + ret = gpiochip_irqchip_add_nested(&chip->gpio_chip, + &max732x_irq_chip, + irq_base, + handle_simple_irq, + IRQ_TYPE_NONE); if (ret) { dev_err(&client->dev, "could not connect irqchip to gpiochip\n"); return ret; } - gpiochip_set_chained_irqchip(&chip->gpio_chip, - &max732x_irq_chip, - client->irq, - NULL); + gpiochip_set_nested_irqchip(&chip->gpio_chip, + &max732x_irq_chip, + client->irq); } return 0; diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c index 99d37b56c258..504550665091 100644 --- a/drivers/gpio/gpio-mcp23s08.c +++ b/drivers/gpio/gpio-mcp23s08.c @@ -473,21 +473,20 @@ static int mcp23s08_irq_setup(struct mcp23s08 *mcp) return err; } - err = gpiochip_irqchip_add(chip, - &mcp23s08_irq_chip, - 0, - handle_simple_irq, - IRQ_TYPE_NONE); + err = gpiochip_irqchip_add_nested(chip, + &mcp23s08_irq_chip, + 0, + handle_simple_irq, + IRQ_TYPE_NONE); if (err) { dev_err(chip->parent, "could not connect irqchip to gpiochip: %d\n", err); return err; } - gpiochip_set_chained_irqchip(chip, - &mcp23s08_irq_chip, - mcp->irq, - NULL); + gpiochip_set_nested_irqchip(chip, + &mcp23s08_irq_chip, + mcp->irq); return 0; } diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index e422568e14ad..121108b6602d 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -635,20 +635,20 @@ static int pca953x_irq_setup(struct pca953x_chip *chip, return ret; } - ret = gpiochip_irqchip_add(&chip->gpio_chip, - &pca953x_irq_chip, - irq_base, - handle_simple_irq, - IRQ_TYPE_NONE); + ret = gpiochip_irqchip_add_nested(&chip->gpio_chip, + &pca953x_irq_chip, + irq_base, + handle_simple_irq, + IRQ_TYPE_NONE); if (ret) { dev_err(&client->dev, "could not connect irqchip to gpiochip\n"); return ret; } - gpiochip_set_chained_irqchip(&chip->gpio_chip, - &pca953x_irq_chip, - client->irq, NULL); + gpiochip_set_nested_irqchip(&chip->gpio_chip, + &pca953x_irq_chip, + client->irq); } return 0; diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c index d168410e2338..895af42a4513 100644 --- a/drivers/gpio/gpio-pcf857x.c +++ b/drivers/gpio/gpio-pcf857x.c @@ -378,9 +378,10 @@ static int pcf857x_probe(struct i2c_client *client, /* Enable irqchip if we have an interrupt */ if (client->irq) { - status = gpiochip_irqchip_add(&gpio->chip, &pcf857x_irq_chip, - 0, handle_level_irq, - IRQ_TYPE_NONE); + status = gpiochip_irqchip_add_nested(&gpio->chip, + &pcf857x_irq_chip, + 0, handle_level_irq, + IRQ_TYPE_NONE); if (status) { dev_err(&client->dev, "cannot add irqchip\n"); goto fail; @@ -393,8 +394,8 @@ static int pcf857x_probe(struct i2c_client *client, if (status) goto fail; - gpiochip_set_chained_irqchip(&gpio->chip, &pcf857x_irq_chip, - client->irq, NULL); + gpiochip_set_nested_irqchip(&gpio->chip, &pcf857x_irq_chip, + client->irq); gpio->irq_parent = client->irq; } diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c index e7d422a6b90b..e194d8ad8612 100644 --- a/drivers/gpio/gpio-stmpe.c +++ b/drivers/gpio/gpio-stmpe.c @@ -484,21 +484,20 @@ static int stmpe_gpio_probe(struct platform_device *pdev) if (stmpe_gpio->norequest_mask & BIT(i)) clear_bit(i, stmpe_gpio->chip.irq_valid_mask); } - ret = gpiochip_irqchip_add(&stmpe_gpio->chip, - &stmpe_gpio_irq_chip, - 0, - handle_simple_irq, - IRQ_TYPE_NONE); + ret = gpiochip_irqchip_add_nested(&stmpe_gpio->chip, + &stmpe_gpio_irq_chip, + 0, + handle_simple_irq, + IRQ_TYPE_NONE); if (ret) { dev_err(&pdev->dev, "could not connect irqchip to gpiochip\n"); goto out_disable; } - gpiochip_set_chained_irqchip(&stmpe_gpio->chip, - &stmpe_gpio_irq_chip, - irq, - NULL); + gpiochip_set_nested_irqchip(&stmpe_gpio->chip, + &stmpe_gpio_irq_chip, + irq); } platform_set_drvdata(pdev, stmpe_gpio); diff --git a/drivers/gpio/gpio-tc3589x.c b/drivers/gpio/gpio-tc3589x.c index 5a5a6cb00eea..f041965f1b03 100644 --- a/drivers/gpio/gpio-tc3589x.c +++ b/drivers/gpio/gpio-tc3589x.c @@ -337,21 +337,20 @@ static int tc3589x_gpio_probe(struct platform_device *pdev) return ret; } - ret = gpiochip_irqchip_add(&tc3589x_gpio->chip, - &tc3589x_gpio_irq_chip, - 0, - handle_simple_irq, - IRQ_TYPE_NONE); + ret = gpiochip_irqchip_add_nested(&tc3589x_gpio->chip, + &tc3589x_gpio_irq_chip, + 0, + handle_simple_irq, + IRQ_TYPE_NONE); if (ret) { dev_err(&pdev->dev, "could not connect irqchip to gpiochip\n"); return ret; } - gpiochip_set_chained_irqchip(&tc3589x_gpio->chip, - &tc3589x_gpio_irq_chip, - irq, - NULL); + gpiochip_set_nested_irqchip(&tc3589x_gpio->chip, + &tc3589x_gpio_irq_chip, + irq); platform_set_drvdata(pdev, tc3589x_gpio); diff --git a/drivers/gpio/gpio-wcove.c b/drivers/gpio/gpio-wcove.c index d0ddba7a9d08..88f29601f8de 100644 --- a/drivers/gpio/gpio-wcove.c +++ b/drivers/gpio/gpio-wcove.c @@ -426,8 +426,8 @@ static int wcove_gpio_probe(struct platform_device *pdev) return ret; } - ret = gpiochip_irqchip_add(&wg->chip, &wcove_irqchip, 0, - handle_simple_irq, IRQ_TYPE_NONE); + ret = gpiochip_irqchip_add_nested(&wg->chip, &wcove_irqchip, 0, + handle_simple_irq, IRQ_TYPE_NONE); if (ret) { dev_err(dev, "Failed to add irqchip: %d\n", ret); return ret; diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index f0fc3a0d37c8..7be4fdafb1a3 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1439,7 +1439,7 @@ static bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip, } /** - * gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip + * gpiochip_set_cascaded_irqchip() - connects a cascaded irqchip to a gpiochip * @gpiochip: the gpiochip to set the irqchip chain to * @irqchip: the irqchip to chain to the gpiochip * @parent_irq: the irq number corresponding to the parent IRQ for this @@ -1448,10 +1448,10 @@ static bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip, * coming out of the gpiochip. If the interrupt is nested rather than * cascaded, pass NULL in this handler argument */ -void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, - struct irq_chip *irqchip, - int parent_irq, - irq_flow_handler_t parent_handler) +static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip, + struct irq_chip *irqchip, + int parent_irq, + irq_flow_handler_t parent_handler) { unsigned int offset; @@ -1475,7 +1475,7 @@ void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, irq_set_chained_handler_and_data(parent_irq, parent_handler, gpiochip); - gpiochip->irq_parent = parent_irq; + gpiochip->irq_chained_parent = parent_irq; } /* Set the parent IRQ for all affected IRQs */ @@ -1486,8 +1486,47 @@ void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, parent_irq); } } + +/** + * gpiochip_set_chained_irqchip() - connects a chained irqchip to a gpiochip + * @gpiochip: the gpiochip to set the irqchip chain to + * @irqchip: the irqchip to chain to the gpiochip + * @parent_irq: the irq number corresponding to the parent IRQ for this + * chained irqchip + * @parent_handler: the parent interrupt handler for the accumulated IRQ + * coming out of the gpiochip. If the interrupt is nested rather than + * cascaded, pass NULL in this handler argument + */ +void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, + struct irq_chip *irqchip, + int parent_irq, + irq_flow_handler_t parent_handler) +{ + gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq, + parent_handler); +} EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); +/** + * gpiochip_set_nested_irqchip() - connects a nested irqchip to a gpiochip + * @gpiochip: the gpiochip to set the irqchip nested handler to + * @irqchip: the irqchip to nest to the gpiochip + * @parent_irq: the irq number corresponding to the parent IRQ for this + * nested irqchip + */ +void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip, + struct irq_chip *irqchip, + int parent_irq) +{ + if (!gpiochip->irq_nested) { + chip_err(gpiochip, "tried to nest a chained gpiochip\n"); + return; + } + gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq, + NULL); +} +EXPORT_SYMBOL_GPL(gpiochip_set_nested_irqchip); + /** * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip * @d: the irqdomain used by this irqchip @@ -1510,8 +1549,8 @@ static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, */ irq_set_lockdep_class(irq, chip->lock_key); irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler); - /* Chips that can sleep need nested thread handlers */ - if (chip->can_sleep && !chip->irq_not_threaded) + /* Chips that use nested thread handlers have them marked */ + if (chip->irq_nested) irq_set_nested_thread(irq, 1); irq_set_noprobe(irq); @@ -1529,7 +1568,7 @@ static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) { struct gpio_chip *chip = d->host_data; - if (chip->can_sleep) + if (chip->irq_nested) irq_set_nested_thread(irq, 0); irq_set_chip_and_handler(irq, NULL, NULL); irq_set_chip_data(irq, NULL); @@ -1584,9 +1623,9 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) acpi_gpiochip_free_interrupts(gpiochip); - if (gpiochip->irq_parent) { - irq_set_chained_handler(gpiochip->irq_parent, NULL); - irq_set_handler_data(gpiochip->irq_parent, NULL); + if (gpiochip->irq_chained_parent) { + irq_set_chained_handler(gpiochip->irq_chained_parent, NULL); + irq_set_handler_data(gpiochip->irq_chained_parent, NULL); } /* Remove all IRQ mappings and delete the domain */ @@ -1610,7 +1649,7 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) } /** - * gpiochip_irqchip_add() - adds an irqchip to a gpiochip + * _gpiochip_irqchip_add() - adds an irqchip to a gpiochip * @gpiochip: the gpiochip to add the irqchip to * @irqchip: the irqchip to add to the gpiochip * @first_irq: if not dynamically assigned, the base (first) IRQ to @@ -1618,6 +1657,8 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) * @handler: the irq handler to use (often a predefined irq core function) * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE * to have the core avoid setting up any default type in the hardware. + * @nested: whether this is a nested irqchip calling handle_nested_irq() + * in its IRQ handler * @lock_key: lockdep class * * This function closely associates a certain irqchip with a certain @@ -1639,6 +1680,7 @@ int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, unsigned int first_irq, irq_flow_handler_t handler, unsigned int type, + bool nested, struct lock_class_key *lock_key) { struct device_node *of_node; @@ -1653,6 +1695,7 @@ int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, pr_err("missing gpiochip .dev parent pointer\n"); return -EINVAL; } + gpiochip->irq_nested = nested; of_node = gpiochip->parent->of_node; #ifdef CONFIG_OF_GPIO /* diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 24e2cc56beb1..4b20238e7570 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -82,8 +82,6 @@ enum single_ended_mode { * implies that if the chip supports IRQs, these IRQs need to be threaded * as the chip access may sleep when e.g. reading out the IRQ status * registers. - * @irq_not_threaded: flag must be set if @can_sleep is set but the - * IRQs don't need to be threaded * @read_reg: reader function for generic GPIO * @write_reg: writer function for generic GPIO * @pin2mask: some generic GPIO controllers work with the big-endian bits @@ -109,8 +107,10 @@ enum single_ended_mode { * for GPIO IRQs, provided by GPIO driver * @irq_default_type: default IRQ triggering type applied during GPIO driver * initialization, provided by GPIO driver - * @irq_parent: GPIO IRQ chip parent/bank linux irq number, - * provided by GPIO driver + * @irq_chained_parent: GPIO IRQ chip parent/bank linux irq number, + * provided by GPIO driver for chained interrupt (not for nested + * interrupts). + * @irq_nested: True if set the interrupt handling is nested. * @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 @@ -166,7 +166,6 @@ struct gpio_chip { u16 ngpio; const char *const *names; bool can_sleep; - bool irq_not_threaded; #if IS_ENABLED(CONFIG_GPIO_GENERIC) unsigned long (*read_reg)(void __iomem *reg); @@ -192,7 +191,8 @@ struct gpio_chip { unsigned int irq_base; irq_flow_handler_t irq_handler; unsigned int irq_default_type; - int irq_parent; + int irq_chained_parent; + bool irq_nested; bool irq_need_valid_mask; unsigned long *irq_valid_mask; struct lock_class_key *lock_key; @@ -270,24 +270,40 @@ void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, int parent_irq, irq_flow_handler_t parent_handler); +void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip, + struct irq_chip *irqchip, + int parent_irq); + int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, struct irq_chip *irqchip, unsigned int first_irq, irq_flow_handler_t handler, unsigned int type, + bool nested, struct lock_class_key *lock_key); +/* FIXME: I assume threaded IRQchips do not have the lockdep problem */ +static inline int gpiochip_irqchip_add_nested(struct gpio_chip *gpiochip, + struct irq_chip *irqchip, + unsigned int first_irq, + irq_flow_handler_t handler, + unsigned int type) +{ + return _gpiochip_irqchip_add(gpiochip, irqchip, first_irq, + handler, type, true, NULL); +} + #ifdef CONFIG_LOCKDEP #define gpiochip_irqchip_add(...) \ ( \ ({ \ static struct lock_class_key _key; \ - _gpiochip_irqchip_add(__VA_ARGS__, &_key); \ + _gpiochip_irqchip_add(__VA_ARGS__, false, &_key); \ }) \ ) #else #define gpiochip_irqchip_add(...) \ - _gpiochip_irqchip_add(__VA_ARGS__, NULL) + _gpiochip_irqchip_add(__VA_ARGS__, false, NULL) #endif #endif /* CONFIG_GPIOLIB_IRQCHIP */ -- 2.20.1