Date:   Wed, 17 Apr 2019 22:12:54 +0530
From:   Lokesh Vutla <lokeshvutla@...com>
To:     Marc Zyngier <marc.zyngier@....com>,
        Tony Lindgren <tony@...mide.com>, Nishanth Menon <nm@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, <jason@...edaemon.net>
CC:     Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Device Tree Mailing List <devicetree@...r.kernel.org>,
        Sekhar Nori <nsekhar@...com>, Tero Kristo <t-kristo@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Grygorii Strashko <grygorii.strashko@...com>
Subject: Re: [PATCH v6 09/12] irqchip: ti-sci-inta: Add support for Interrupt
 Aggregator driver

Hi Marc,

On 17/04/19 7:44 PM, Marc Zyngier wrote:
> Hi Lokesh,
> 
> On 10/04/2019 05:13, Lokesh Vutla wrote:
>> Texas Instruments' K3 generation SoCs has an IP Interrupt Aggregator
>> which is an interrupt controller that does the following:
>> - Converts events to interrupts that can be understood by
>>   an interrupt router.
>> - Allows for multiplexing of events to interrupts.
>>
>> Configuration of the interrupt aggregator registers can only be done by
>> a system co-processor and the driver needs to send a message to this
>> co processor over TISCI protocol.
>>
>> Add support for Interrupt Aggregator driver with 2 IRQ Domains:
>> - INTA MSI domain that interfaces the devices using which interrupts can be
>>   allocated dynamically.
>> - INTA domain that is parent to the MSI domain that manages the interrupt
>>   resources.
>>
>> Signed-off-by: Lokesh Vutla <lokeshvutla@...com>
>> ---
>> Changes since v5:
>> - Moved all the allocation of events and parent irqs to .irq_request_resources
>>   callback of irqchip. This is based on the offline discussion with Marc.
>>
>> Marc,
>> 	This version has a deviation from our discussion:
>> - Could not create separate irq_domains for each output(vint) of INTA, instead
>>   stick to a single irq_domain for the entire INTA. Because when creating
>>   msi_domain there is no parent available to attach. Even then I create
>>   irq_domains for all the available vints during probe, how do we decide
>>   which is the parent of msi_domain?
> 
> Yeah, you're right. The top-down allocation assumes that we already have
> setup the domain hierarchy, and this delayed allocation scheme breaks
> it. Oh well, never mind.
> 
>>
>>
>>  MAINTAINERS                       |   1 +
>>  drivers/irqchip/Kconfig           |  11 +
>>  drivers/irqchip/Makefile          |   1 +
>>  drivers/irqchip/irq-ti-sci-inta.c | 622 ++++++++++++++++++++++++++++++
>>  4 files changed, 635 insertions(+)
>>  create mode 100644 drivers/irqchip/irq-ti-sci-inta.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 90173038f674..ba88b3033fe4 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -15352,6 +15352,7 @@ F:	drivers/reset/reset-ti-sci.c
>>  F:	Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.txt
>>  F:	Documentation/devicetree/bindings/interrupt-controller/ti,sci-inta.txt
>>  F:	drivers/irqchip/irq-ti-sci-intr.c
>> +F:	drivers/irqchip/irq-ti-sci-inta.c
>>  
>>  Texas Instruments ASoC drivers
>>  M:	Peter Ujfalusi <peter.ujfalusi@...com>
>> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
>> index a1ff64c1d40d..946c062fcec0 100644
>> --- a/drivers/irqchip/Kconfig
>> +++ b/drivers/irqchip/Kconfig
>> @@ -436,6 +436,17 @@ config TI_SCI_INTR_IRQCHIP
>>  	  If you wish to use interrupt router irq resources managed by the
>>  	  TI System Controller, say Y here. Otherwise, say N.
>>  
>> +config TI_SCI_INTA_IRQCHIP
>> +	bool
>> +	depends on TI_SCI_PROTOCOL && ARCH_K3
>> +	select IRQ_DOMAIN
>> +	select IRQ_DOMAIN_HIERARCHY
>> +	help
>> +	  This enables the irqchip driver support for K3 Interrupt aggregator
>> +	  over TI System Control Interface available on some new TI's SoCs.
>> +	  If you wish to use interrupt aggregator irq resources managed by the
>> +	  TI System Controller, say Y here. Otherwise, say N.
>> +
>>  endmenu
>>  
>>  config SIFIVE_PLIC
>> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
>> index fa5c865788b5..8a33013da953 100644
>> --- a/drivers/irqchip/Makefile
>> +++ b/drivers/irqchip/Makefile
>> @@ -98,3 +98,4 @@ obj-$(CONFIG_IMX_IRQSTEER)		+= irq-imx-irqsteer.o
>>  obj-$(CONFIG_MADERA_IRQ)		+= irq-madera.o
>>  obj-$(CONFIG_LS1X_IRQ)			+= irq-ls1x.o
>>  obj-$(CONFIG_TI_SCI_INTR_IRQCHIP)	+= irq-ti-sci-intr.o
>> +obj-$(CONFIG_TI_SCI_INTA_IRQCHIP)	+= irq-ti-sci-inta.o
>> diff --git a/drivers/irqchip/irq-ti-sci-inta.c b/drivers/irqchip/irq-ti-sci-inta.c
>> new file mode 100644
>> index 000000000000..3eb935ebe10f
>> --- /dev/null
>> +++ b/drivers/irqchip/irq-ti-sci-inta.c
>> @@ -0,0 +1,622 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Texas Instruments' K3 Interrupt Aggregator irqchip driver
>> + *
>> + * Copyright (C) 2018-2019 Texas Instruments Incorporated - http://www.ti.com/
>> + *	Lokesh Vutla <lokeshvutla@...com>
>> + */
>> +
>> +#include <linux/err.h>
>> +#include <linux/io.h>
>> +#include <linux/msi.h>
>> +#include <linux/irqchip.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/module.h>
>> +#include <linux/moduleparam.h>
>> +#include <linux/irqdomain.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/soc/ti/ti_sci_protocol.h>
>> +#include <linux/irqchip/chained_irq.h>
>> +#include <asm-generic/msi.h>
>> +
>> +#define TI_SCI_DEV_ID_MASK	0xffff
>> +#define TI_SCI_DEV_ID_SHIFT	16
>> +#define TI_SCI_IRQ_ID_MASK	0xffff
>> +#define TI_SCI_IRQ_ID_SHIFT	0
>> +#define HWIRQ_TO_DEVID(hwirq)	(((hwirq) >> (TI_SCI_DEV_ID_SHIFT)) & \
>> +				 (TI_SCI_DEV_ID_MASK))
>> +#define HWIRQ_TO_IRQID(hwirq)	((hwirq) & (TI_SCI_IRQ_ID_MASK))
>> +
>> +#define MAX_EVENTS_PER_VINT	64
>> +#define VINT_ENABLE_SET_OFFSET	0x0
>> +#define VINT_ENABLE_CLR_OFFSET	0x8
>> +#define VINT_STATUS_OFFSET	0x18
>> +
>> +/**
>> + * struct ti_sci_inta_event_desc - Description of an event coming to
>> + *				   Interrupt Aggregator. This serves
>> + *				   as a mapping table between global
>> + *				   event and hwirq.
>> + * @global_event:	Global event number corresponding to this event
>> + * @hwirq:		Hwirq of the incoming interrupt
>> + */
>> +struct ti_sci_inta_event_desc {
>> +	u16 global_event;
>> +	u32 hwirq;
>> +};
>> +
>> +/**
>> + * struct ti_sci_inta_vint_desc - Description of a virtual interrupt coming out
>> + *				  of Interrupt Aggregator.
>> + * @domain:		Pointer to IRQ domain to which this vint belongs.
>> + * @list:		List entry for the vint list
>> + * @event_map:		Bitmap to manage the allocation of events to vint.
>> + * @event_mutex:	Mutex to protect allocation of events.
>> + * @events:		Array of event descriptors assigned to this vint.
>> + * @parent_virq:	Linux IRQ number that gets attached to parent
>> + * @vint_id:		TISCI vint ID
>> + */
>> +struct ti_sci_inta_vint_desc {
>> +	struct irq_domain *domain;
>> +	struct list_head list;
>> +	unsigned long *event_map;
>> +	/* Mutex to protect allocation of events */
>> +	struct mutex event_mutex;
> 
> As mentioned in another email, this needs to be a spinlock, as the lock
> may be taken in atomic context.
> 
>> +	struct ti_sci_inta_event_desc events[MAX_EVENTS_PER_VINT];
>> +	unsigned int parent_virq;
>> +	u16 vint_id;
>> +};
>> +
>> +/**
>> + * struct ti_sci_inta_irq_domain - Structure representing a TISCI based
>> + *				   Interrupt Aggregator IRQ domain.
>> + * @sci:		Pointer to TISCI handle
>> + * @vint:		TISCI resource pointer representing IA inerrupts.
>> + * @global_event:	TISCI resource pointer representing global events.
>> + * @vint_list:		List of the vints active in the system
>> + * @vint_mutex:		Mutex to protect vint_list
>> + * @base:		Base address of the memory mapped IO registers
>> + * @pdev:		Pointer to platform device.
>> + */
>> +struct ti_sci_inta_irq_domain {
>> +	const struct ti_sci_handle *sci;
>> +	struct ti_sci_resource *vint;
>> +	struct ti_sci_resource *global_event;
>> +	struct list_head vint_list;
>> +	/* Mutex to protect vint list */
>> +	struct mutex vint_mutex;
>> +	void __iomem *base;
>> +	struct platform_device	*pdev;
>> +};
>> +
>> +/**
>> + * ti_sci_inta_irq_handler() - Chained IRQ handler for the vint irqs
>> + * @desc:	Pointer to irq_desc corresponding to the irq
>> + */
>> +static void ti_sci_inta_irq_handler(struct irq_desc *desc)
>> +{
>> +	struct ti_sci_inta_vint_desc *vint_desc;
>> +	struct ti_sci_inta_irq_domain *inta;
>> +	struct irq_domain *domain;
>> +	unsigned int virq, bit;
>> +	u64 val;
>> +
>> +	vint_desc = irq_desc_get_handler_data(desc);
>> +	domain = vint_desc->domain;
>> +	inta = domain->host_data;
>> +
>> +	chained_irq_enter(irq_desc_get_chip(desc), desc);
>> +
>> +	val = readq_relaxed(inta->base + vint_desc->vint_id * 0x1000 +
>> +			    VINT_STATUS_OFFSET);
>> +
>> +	for (bit = 0; bit < MAX_EVENTS_PER_VINT; bit++) {
>> +		if (BIT(bit) & val) {
>> +			virq = irq_find_mapping(domain,
>> +						vint_desc->events[bit].hwirq);
>> +			if (virq)
>> +				generic_handle_irq(virq);
>> +		}
>> +	}
>> +
>> +	chained_irq_exit(irq_desc_get_chip(desc), desc);
>> +}
>> +
>> +/**
>> + * ti_sci_inta_alloc_parent_irq() - Allocate parent irq to Interrupt aggregator
>> + * @domain:	IRQ domain corresponding to Interrupt Aggregator
>> + *
>> + * Return 0 if all went well else corresponding error value.
>> + */
>> +static struct ti_sci_inta_vint_desc
>> +*ti_sci_inta_alloc_parent_irq(struct irq_domain *domain)
> 
> nit: do not split lines like this, specially not with the * on a
> different line than the type it applies to.

okay. I was trying to make checkpatch script happy.

> 
>> +{
>> +	struct ti_sci_inta_irq_domain *inta = domain->host_data;
>> +	struct ti_sci_inta_vint_desc *vint_desc;
>> +	struct irq_fwspec parent_fwspec;
>> +	u16 vint_id;
>> +
>> +	vint_id = ti_sci_get_free_resource(inta->vint);
>> +	if (vint_id == TI_SCI_RESOURCE_NULL)
>> +		return ERR_PTR(-EINVAL);
>> +
>> +	vint_desc = kzalloc(sizeof(*vint_desc), GFP_KERNEL);
>> +	if (!vint_desc)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	vint_desc->event_map = kcalloc(BITS_TO_LONGS(MAX_EVENTS_PER_VINT),
>> +				       sizeof(*vint_desc->event_map),
>> +				       GFP_KERNEL);
> 
> You already have an array of MAX_EVENTS_PER_VINT (events) in this
> structure. Why don't you simply declare it as a
> MAX_EVENTS_PER_VINT-sized bitmap and save yourself the allocation?

okay. will fix it in next version.

> 
>> +	if (!vint_desc->event_map) {
>> +		kfree(vint_desc);
>> +		return ERR_PTR(-ENOMEM);
>> +	}
>> +	mutex_init(&vint_desc->event_mutex);
>> +
>> +	vint_desc->domain = domain;
>> +	vint_desc->vint_id = vint_id;
>> +	INIT_LIST_HEAD(&vint_desc->list);
>> +
>> +	mutex_lock(&inta->vint_mutex);
>> +	list_add_tail(&vint_desc->list, &inta->vint_list);
>> +	mutex_unlock(&inta->vint_mutex);
>> +
>> +	parent_fwspec.fwnode =
>> +	of_node_to_fwnode(of_irq_find_parent(dev_of_node(&inta->pdev->dev)));
> 
> single line.
> 
>> +	parent_fwspec.param_count = 3;
>> +	parent_fwspec.param[0] = inta->pdev->id;
>> +	parent_fwspec.param[1] = vint_desc->vint_id;
>> +	parent_fwspec.param[2] = 1;
>> +
>> +	vint_desc->parent_virq = irq_create_fwspec_mapping(&parent_fwspec);
>> +	if (vint_desc->parent_virq <= 0)
>> +		return ERR_PTR(vint_desc->parent_virq);
> 
> Don't you need to free vint_desc (and its event_map) here?

yeah, you are right.

> 
>> +
>> +	irq_set_chained_handler_and_data(vint_desc->parent_virq,
>> +					 ti_sci_inta_irq_handler, vint_desc);
>> +
>> +	return vint_desc;
>> +}
>> +
>> +/**
>> + * ti_sci_inta_alloc_event() - Attach an event to a IA vint.
>> + * @inta:	Pointer to INTA domain descriptor
>> + * @vint_desc:	Pointer to vint_desc to which the event gets attached
>> + * @free_bit:	Bit inside vint to which event gets attached
>> + * @hwirq:	hwirq of the input event
>> + *
>> + * Return global_event if all went ok else appropriate error value.
>> + */
>> +static
>> +int ti_sci_inta_alloc_event(struct ti_sci_inta_irq_domain *inta,
>> +			    struct ti_sci_inta_vint_desc *vint_desc,
>> +			    u16 free_bit, u32 hwirq)
>> +{
>> +	struct ti_sci_inta_event_desc *event_desc;
>> +	u16 dev_id, dev_index;
>> +	int err;
>> +
>> +	dev_id = HWIRQ_TO_DEVID(hwirq);
>> +	dev_index = HWIRQ_TO_IRQID(hwirq);
>> +	event_desc = &vint_desc->events[free_bit];
>> +	mutex_lock(&vint_desc->event_mutex);
>> +	event_desc->hwirq = hwirq;
>> +	event_desc->global_event = ti_sci_get_free_resource(inta->global_event);
>> +	if (event_desc->global_event == TI_SCI_RESOURCE_NULL) {
>> +		err = -EINVAL;
>> +		goto free_vint_bit;
>> +	}
>> +
>> +	err = inta->sci->ops.rm_irq_ops.set_event_map(inta->sci,
>> +						      dev_id, dev_index,
>> +						      inta->pdev->id,
>> +						      vint_desc->vint_id,
>> +						      event_desc->global_event,
>> +						      free_bit);
>> +	if (err)
>> +		goto free_global_event;
>> +
>> +	mutex_unlock(&vint_desc->event_mutex);
>> +	return 0;
>> +free_global_event:
>> +	ti_sci_release_resource(inta->global_event, event_desc->global_event);
>> +free_vint_bit:
>> +	clear_bit(free_bit, vint_desc->event_map);
>> +	mutex_unlock(&vint_desc->event_mutex);
>> +	return err;
>> +}
>> +
>> +/**
>> + * ti_sci_inta_alloc_irq() -  Allocate an irq within INTA domain
>> + * @domain:	irq_domain pointer corresponding to INTA
>> + * @hwirq:	hwirq of the input event
>> + *
>> + * Note: Allocation happens in the following manner:
>> + *	- Find a free bit available in any of the vints available in the list.
>> + *	- If not found, allocate a vint from the vint pool
>> + *	- Attach the free bit to input hwirq.
>> + * Return vint_desc if all went ok else appropriate error value.
>> + */
>> +static struct ti_sci_inta_vint_desc
>> +*ti_sci_inta_alloc_irq(struct irq_domain *domain, u32 hwirq)
>> +{
>> +	struct ti_sci_inta_irq_domain *inta = domain->host_data;
>> +	struct ti_sci_inta_vint_desc *vint_desc = NULL;
>> +	u16 free_bit;
>> +	int ret;
>> +
>> +	mutex_lock(&inta->vint_mutex);
>> +	list_for_each_entry(vint_desc, &inta->vint_list, list) {
>> +		mutex_lock(&vint_desc->event_mutex);
>> +		free_bit = find_first_zero_bit(vint_desc->event_map,
>> +					       MAX_EVENTS_PER_VINT);
>> +		if (free_bit != MAX_EVENTS_PER_VINT) {
>> +			set_bit(free_bit, vint_desc->event_map);
>> +			mutex_unlock(&vint_desc->event_mutex);
>> +			mutex_unlock(&inta->vint_mutex);
>> +			goto alloc_event;
>> +		}
>> +		mutex_unlock(&vint_desc->event_mutex);
>> +	}
>> +	mutex_unlock(&inta->vint_mutex);
>> +
>> +	/* No free bits available. Allocate a new vint */
>> +	vint_desc = ti_sci_inta_alloc_parent_irq(domain);
>> +	if (IS_ERR(vint_desc))
>> +		return vint_desc;
>> +
>> +	mutex_lock(&vint_desc->event_mutex);
>> +	free_bit = find_first_zero_bit(vint_desc->event_map,
>> +				       MAX_EVENTS_PER_VINT);
>> +	set_bit(free_bit, vint_desc->event_map);
>> +	mutex_unlock(&vint_desc->event_mutex);
>> +
>> +alloc_event:
>> +	ret = ti_sci_inta_alloc_event(inta, vint_desc, free_bit, hwirq);
>> +	if (ret)
>> +		return ERR_PTR(ret);
> 
> Without freeing the allocated bit?

ti_sci_inta_alloc_event() is taking care of freeing the allocated bit with the
lock acquired.

> 
>> +
>> +	return vint_desc;
>> +}
>> +
>> +/**
>> + * __get_event_index() - Convert the hwirq to corresponding bit inside vint.
>> + * @vint_desc:	Pointer to vint_desc to which the hwirq is attached
>> + * @hwirq:	hwirq number within the domain
>> + *
>> + * Return the vint bit to which the hwirq is attached.
>> + */
>> +static int __get_event_index(struct ti_sci_inta_vint_desc *vint_desc, u32 hwirq)
>> +{
>> +	int i;
>> +
>> +	mutex_lock(&vint_desc->event_mutex);
>> +	for (i = 0; i < MAX_EVENTS_PER_VINT; i++)
>> +		if (vint_desc->events[i].hwirq == hwirq) {
>> +			mutex_unlock(&vint_desc->event_mutex);
>> +			return i;
>> +		}
>> +
>> +	mutex_unlock(&vint_desc->event_mutex);
>> +	return -ENODEV;
> 
> OK, this is terrible. Having this loop on every mask/unmask/ack, plus
> the contention on the lock (64:1, great) is just going to ruin latency.
> 
> Can't you spare 5 bits in hwirq to encode the index? Somehow, I don't
> really believe that you do have 16bits of DEVID *and* 16bits of IRQID
> (whatever the later is). Or allocate some per interrupt data that allows
> the retrieval of the index in O(1)?

Ill prefer the later. Will try to re create event_index structure a bit and get
index in O(1).

> 
> It would also solve your locking issue...
> 
>> +}
>> +
>> +/**
>> + * ti_sci_inta_free_parent_irq() - Free a parent irq to INTA
>> + * domain:	domain corresponding to INTA
>> + */
>> +static void ti_sci_inta_free_parent_irq(struct irq_domain *domain,
>> +					struct ti_sci_inta_vint_desc *vint_desc)
>> +{
>> +	struct ti_sci_inta_irq_domain *inta = domain->host_data;
>> +
>> +	mutex_lock(&inta->vint_mutex);
>> +	list_del(&vint_desc->list);
>> +	mutex_unlock(&inta->vint_mutex);
>> +	irq_dispose_mapping(vint_desc->parent_virq);
>> +	ti_sci_release_resource(inta->vint, vint_desc->vint_id);
>> +	kfree(vint_desc->event_map);
>> +	kfree(vint_desc);
>> +}
>> +
>> +/**
>> + * ti_sci_inta_free_irq() - Free an IRQ within INTA domain
>> + * domain:	Domain corresponding to INTA
>> + * vint_desc:	Pointer to vint_desc from which irq needs to be freed
>> + * hwirq:	Hwirq number within INTA domain that needs to be freed
>> + */
>> +static void ti_sci_inta_free_irq(struct irq_domain *domain,
>> +				 struct ti_sci_inta_vint_desc *vint_desc,
>> +				 u32 hwirq)
>> +{
>> +	struct ti_sci_inta_irq_domain *inta = domain->host_data;
>> +	struct ti_sci_inta_event_desc *event_desc;
>> +	int event_index = 0;
>> +
>> +	/* free event irq */
>> +	event_index = __get_event_index(vint_desc, hwirq);
>> +	event_desc = &vint_desc->events[event_index];
>> +	mutex_lock(&vint_desc->event_mutex);
>> +	inta->sci->ops.rm_irq_ops.free_event_map(inta->sci,
>> +						 HWIRQ_TO_DEVID(hwirq),
>> +						 HWIRQ_TO_IRQID(hwirq),
>> +						 inta->pdev->id,
>> +						 vint_desc->vint_id,
>> +						 event_desc->global_event,
>> +						 event_index);
>> +
>> +	clear_bit(event_index, vint_desc->event_map);
>> +	ti_sci_release_resource(inta->global_event, event_desc->global_event);
>> +	event_desc->global_event = TI_SCI_RESOURCE_NULL;
>> +	event_desc->hwirq = 0;
>> +	mutex_unlock(&vint_desc->event_mutex);
>> +
>> +	/* Free parent irq */
>> +	if (find_first_bit(vint_desc->event_map, MAX_EVENTS_PER_VINT) ==
>> +	    MAX_EVENTS_PER_VINT)
> 
> Single line. Also, how do you ensure that this doesn't race with the
> allocation if you're not holding the lock?

will fix it in next version.

> 
>> +		ti_sci_inta_free_parent_irq(domain, vint_desc);
>> +}
>> +
>> +/**
>> + * ti_sci_inta_request_resources() - Allocate resources for input irq
>> + * @data: Pointer to corresponding irq_data
>> + *
>> + * Note: This is the core api where the actual allocation happens for input
>> + *	 hwirq. This allocation involves creating a parent irq for vint.
>> + *	 If this is done in irq_domain_ops.alloc() then a deadlock is reached
>> + *	 for allocation. So this allocation is being done in request_resources()
>> + *
>> + * Return: 0 if all went well else corresponding error.
>> + */
>> +static int ti_sci_inta_request_resources(struct irq_data *data)
>> +{
>> +	struct ti_sci_inta_vint_desc *vint_desc;
>> +
>> +	vint_desc = ti_sci_inta_alloc_irq(data->domain, data->hwirq);
>> +	if (IS_ERR(vint_desc))
>> +		return PTR_ERR(vint_desc);
>> +
>> +	data->chip_data = vint_desc;
>> +
>> +	return 0;
>> +}
>> +
>> +/**
>> + * ti_sci_inta_release_resources - Release resources for input irq
>> + * @data: Pointer to corresponding irq_data
>> + *
>> + * Note: Corresponding to request_resources(), all the unmapping and deletion
>> + *	 of parent vint irqs happens in this api.
>> + */
>> +static void ti_sci_inta_release_resources(struct irq_data *data)
>> +{
>> +	struct ti_sci_inta_vint_desc *vint_desc;
>> +
>> +	vint_desc = irq_data_get_irq_chip_data(data);
>> +	ti_sci_inta_free_irq(data->domain, vint_desc, data->hwirq);
>> +}
>> +
>> +/**
>> + * __ti_sci_inta_manage_event() - Control the event based on the offset
>> + * @data:	Pointer to corresponding irq_data
>> + * @offset:	register offset using which event is controlled.
>> + */
>> +static void __ti_sci_inta_manage_event(struct irq_data *data, u32 offset)
>> +{
>> +	struct ti_sci_inta_vint_desc *vint_desc;
>> +	struct ti_sci_inta_irq_domain *inta;
>> +	int event_index;
>> +
>> +	vint_desc = irq_data_get_irq_chip_data(data);
>> +	inta = data->domain->host_data;
>> +	event_index = __get_event_index(vint_desc, data->hwirq);
>> +	if (event_index < 0)
>> +		return;
>> +
>> +	writeq_relaxed(BIT(event_index), inta->base +
>> +		       vint_desc->vint_id * 0x1000 + offset);
>> +}
>> +
>> +/**
>> + * ti_sci_inta_mask_irq() - Mask an event
>> + * @data:	Pointer to corresponding irq_data
>> + */
>> +static void ti_sci_inta_mask_irq(struct irq_data *data)
>> +{
>> +	__ti_sci_inta_manage_event(data, VINT_ENABLE_CLR_OFFSET);
>> +}
>> +
>> +/**
>> + * ti_sci_inta_unmask_irq() - Unmask an event
>> + * @data:	Pointer to corresponding irq_data
>> + */
>> +static void ti_sci_inta_unmask_irq(struct irq_data *data)
>> +{
>> +	__ti_sci_inta_manage_event(data, VINT_ENABLE_SET_OFFSET);
>> +}
>> +
>> +/**
>> + * ti_sci_inta_ack_irq() - Ack an event
>> + * @data:	Pointer to corresponding irq_data
>> + */
>> +static void ti_sci_inta_ack_irq(struct irq_data *data)
>> +{
>> +	__ti_sci_inta_manage_event(data, VINT_STATUS_OFFSET);
>> +}
>> +
>> +static int ti_sci_inta_set_affinity(struct irq_data *d,
>> +				    const struct cpumask *mask_val, bool force)
>> +{
>> +	return -EINVAL;
>> +}
>> +
>> +/**
>> + * ti_sci_inta_set_type() - Update the trigger type of the irq.
>> + * @data:	Pointer to corresponding irq_data
>> + * @type:	Trigger type as specified by user
>> + *
>> + * Note: This updates the handle_irq callback for level msi.
>> + *
>> + * Return 0 if all went well else appropriate error.
>> + */
>> +static int ti_sci_inta_set_type(struct irq_data *data, unsigned int type)
>> +{
>> +	struct irq_desc *desc = irq_to_desc(data->irq);
>> +
>> +	/*
>> +	 * .alloc default sets handle_edge_irq. But if the user specifies
>> +	 * that IRQ is level MSI, then update the handle to handle_level_irq
>> +	 */
>> +	if (type & IRQF_TRIGGER_HIGH)
>> +		desc->handle_irq = handle_level_irq;
>> +
>> +	return 0;
> 
> How about invalid values?

Sure, will fix it in next version.


Thanks and reagrds,
Lokesh

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