| Message ID | 20220201120310.878267-1-maz@kernel.org |
|---|---|
| Headers | show |
| Series | genirq: Move irqchip runtime PM over to irq domain | expand |
On Tue, Feb 1, 2022 at 1:03 PM Marc Zyngier <maz@kernel.org> wrote: > > Our irq_chip data structure currently suffers from two problems: > > (1) the 'name' field is often dynamically populated with a reference > to the underlying HW (DT node dame, for example) > > (2) the 'parent_device' which is used to implement runtime PM is also > dynamically populated > > (3) there is at least one instance of a subsystem messing with the > internals of irq_chip structures (gpiochip_set_irq_hooks is > what I know about) > > These things mean that although the primary use of irq_chip is to only > contain function pointers and other *static* information, the above > two fields result in these structures being copied in a number of > drivers. Eventually, it would be much better if the various drivers > would use irq_chip as an 'ops' data structure (potentially made > read-only), and keep the dynamic information somewhere more suitable. > > For (2) we already have the irqdomain structure that is designed to > deal with the context in which interrupts are used, and it makes sense > to move the 'parent_device' field over to this structure. This is what > this small series is doing, with some minor cleanup on the way. > > (1) and (3) will be dealt in separate series (and I don't have a good > solution for (3) yet). > > Thanks, > > M. > > Marc Zyngier (12): > genirq: Allow the PM device to originate from irq domain > irqchip/gic: Move PM device over to irq domain > irqchip/renesas-intc-gpio: Move PM device over to irq domain > irqchip/renesas-irqc: Move PM device over to irq domain > irqchip/imx-intmux: Move PM device over to irq domain > gpio: mt7621: Kill parent_device usage > gpio: omap: Move PM device over to irq domain > gpio: rcar: Move PM device over to irq domain > gpio: tpmx86: Move PM device over to irq domain > pinctrl: npcm: Fix broken references to chip->parent_device > pinctrl: starfive: Move PM device over to irq domain > genirq: Kill irq_chip::parent_device > > drivers/gpio/gpio-mt7621.c | 1 - > drivers/gpio/gpio-omap.c | 7 ++++--- > drivers/gpio/gpio-rcar.c | 2 +- > drivers/gpio/gpio-tqmx86.c | 3 ++- > drivers/irqchip/irq-gic.c | 12 +++++------ > drivers/irqchip/irq-imx-intmux.c | 8 +++----- > drivers/irqchip/irq-renesas-intc-irqpin.c | 3 ++- > drivers/irqchip/irq-renesas-irqc.c | 3 ++- > drivers/pinctrl/nuvoton/pinctrl-npcm7xx.c | 25 +++++++++++------------ > drivers/pinctrl/pinctrl-starfive.c | 3 ++- > include/linux/irq.h | 2 -- > include/linux/irqdomain.h | 10 +++++++++ > kernel/irq/chip.c | 20 +++++++++++++----- > 13 files changed, 59 insertions(+), 40 deletions(-) > > -- > 2.30.2 > The changes for GPIO are small so: Acked-by: Bartosz Golaszewski <brgl@bgdev.pl> You can take it through your tree and if there are any conflicts, I'll just ask for an immutable branch. Bart
Our irq_chip data structure currently suffers from two problems: (1) the 'name' field is often dynamically populated with a reference to the underlying HW (DT node dame, for example) (2) the 'parent_device' which is used to implement runtime PM is also dynamically populated (3) there is at least one instance of a subsystem messing with the internals of irq_chip structures (gpiochip_set_irq_hooks is what I know about) These things mean that although the primary use of irq_chip is to only contain function pointers and other *static* information, the above two fields result in these structures being copied in a number of drivers. Eventually, it would be much better if the various drivers would use irq_chip as an 'ops' data structure (potentially made read-only), and keep the dynamic information somewhere more suitable. For (2) we already have the irqdomain structure that is designed to deal with the context in which interrupts are used, and it makes sense to move the 'parent_device' field over to this structure. This is what this small series is doing, with some minor cleanup on the way. (1) and (3) will be dealt in separate series (and I don't have a good solution for (3) yet). Thanks, M. Marc Zyngier (12): genirq: Allow the PM device to originate from irq domain irqchip/gic: Move PM device over to irq domain irqchip/renesas-intc-gpio: Move PM device over to irq domain irqchip/renesas-irqc: Move PM device over to irq domain irqchip/imx-intmux: Move PM device over to irq domain gpio: mt7621: Kill parent_device usage gpio: omap: Move PM device over to irq domain gpio: rcar: Move PM device over to irq domain gpio: tpmx86: Move PM device over to irq domain pinctrl: npcm: Fix broken references to chip->parent_device pinctrl: starfive: Move PM device over to irq domain genirq: Kill irq_chip::parent_device drivers/gpio/gpio-mt7621.c | 1 - drivers/gpio/gpio-omap.c | 7 ++++--- drivers/gpio/gpio-rcar.c | 2 +- drivers/gpio/gpio-tqmx86.c | 3 ++- drivers/irqchip/irq-gic.c | 12 +++++------ drivers/irqchip/irq-imx-intmux.c | 8 +++----- drivers/irqchip/irq-renesas-intc-irqpin.c | 3 ++- drivers/irqchip/irq-renesas-irqc.c | 3 ++- drivers/pinctrl/nuvoton/pinctrl-npcm7xx.c | 25 +++++++++++------------ drivers/pinctrl/pinctrl-starfive.c | 3 ++- include/linux/irq.h | 2 -- include/linux/irqdomain.h | 10 +++++++++ kernel/irq/chip.c | 20 +++++++++++++----- 13 files changed, 59 insertions(+), 40 deletions(-)