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Message-ID: <CACxGe6vKjJtOhsA6b2qmd6azZyi8ZOwGYdn2wP2brguVm6KGoQ@mail.gmail.com>
Date: Sat, 4 Feb 2012 07:05:37 -0700
From: Grant Likely <grant.likely@...retlab.ca>
To: Shawn Guo <shawn.guo@...aro.org>
Cc: Rob Herring <robherring2@...il.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Thomas Gleixner <tglx@...utronix.de>, b-cousson@...com,
Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH v4 2/4] irq: add irq_domain support to generic-chip
On Sat, Feb 4, 2012 at 7:08 AM, Shawn Guo <shawn.guo@...aro.org> wrote:
> On Fri, Feb 03, 2012 at 04:35:10PM -0600, Rob Herring wrote:
>> From: Rob Herring <rob.herring@...xeda.com>
>>
>> Add irq domain support to irq generic-chip. This enables users of
>> generic-chip to support dynamic irq assignment needed for DT interrupt
>> binding.
>>
>> Signed-off-by: Rob Herring <rob.herring@...xeda.com>
>> Cc: Grant Likely <grant.likely@...retlab.ca>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> ---
>> include/linux/irq.h | 15 +++++
>> kernel/irq/generic-chip.c | 154 ++++++++++++++++++++++++++++++++++++++-------
>> 2 files changed, 147 insertions(+), 22 deletions(-)
>>
>> diff --git a/include/linux/irq.h b/include/linux/irq.h
>> index bff29c5..d721abc 100644
>> --- a/include/linux/irq.h
>> +++ b/include/linux/irq.h
>> @@ -664,7 +664,12 @@ struct irq_chip_generic {
>> raw_spinlock_t lock;
>> void __iomem *reg_base;
>> unsigned int irq_base;
>> + unsigned int hwirq_base;
>> unsigned int irq_cnt;
>> + struct irq_domain *domain;
>> + unsigned int flags;
>> + unsigned int irq_set;
>> + unsigned int irq_clr;
>> u32 mask_cache;
>> u32 type_cache;
>> u32 polarity_cache;
>> @@ -707,6 +712,16 @@ irq_alloc_generic_chip(const char *name, int nr_ct, unsigned int irq_base,
>> void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk,
>> enum irq_gc_flags flags, unsigned int clr,
>> unsigned int set);
>> +
>> +struct device_node;
>> +int irq_setup_generic_chip_domain(const char *name, struct device_node *node,
>> + int num_ct, unsigned int irq_base,
>> + void __iomem *reg_base,
>> + irq_flow_handler_t handler, u32 hwirq_cnt,
>> + enum irq_gc_flags flags,
>> + unsigned int clr, unsigned int set,
>> + void (*gc_init_cb)(struct irq_chip_generic *),
>> + void *private);
>> int irq_setup_alt_chip(struct irq_data *d, unsigned int type);
>> void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
>> unsigned int clr, unsigned int set);
>> diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
>> index c89295a..ffbe6fe 100644
>> --- a/kernel/irq/generic-chip.c
>> +++ b/kernel/irq/generic-chip.c
>> @@ -5,6 +5,7 @@
>> */
>> #include <linux/io.h>
>> #include <linux/irq.h>
>> +#include <linux/irqdomain.h>
>> #include <linux/slab.h>
>> #include <linux/export.h>
>> #include <linux/interrupt.h>
>> @@ -39,7 +40,7 @@ void irq_gc_noop(struct irq_data *d)
>> void irq_gc_mask_disable_reg(struct irq_data *d)
>> {
>> struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>> - u32 mask = 1 << (d->irq - gc->irq_base);
>> + u32 mask = (1 << d->hwirq) % 32;
>>
>> irq_gc_lock(gc);
>> irq_reg_writel(mask, gc->reg_base + cur_regs(d)->disable);
>> @@ -57,7 +58,7 @@ void irq_gc_mask_disable_reg(struct irq_data *d)
>> void irq_gc_mask_set_bit(struct irq_data *d)
>> {
>> struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>> - u32 mask = 1 << (d->irq - gc->irq_base);
>> + u32 mask = (1 << d->hwirq) % 32;
>>
>> irq_gc_lock(gc);
>> gc->mask_cache |= mask;
>> @@ -75,7 +76,7 @@ void irq_gc_mask_set_bit(struct irq_data *d)
>> void irq_gc_mask_clr_bit(struct irq_data *d)
>> {
>> struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>> - u32 mask = 1 << (d->irq - gc->irq_base);
>> + u32 mask = (1 << d->hwirq) % 32;
>>
>> irq_gc_lock(gc);
>> gc->mask_cache &= ~mask;
>> @@ -93,7 +94,7 @@ void irq_gc_mask_clr_bit(struct irq_data *d)
>> void irq_gc_unmask_enable_reg(struct irq_data *d)
>> {
>> struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>> - u32 mask = 1 << (d->irq - gc->irq_base);
>> + u32 mask = (1 << d->hwirq) % 32;
>>
>> irq_gc_lock(gc);
>> irq_reg_writel(mask, gc->reg_base + cur_regs(d)->enable);
>> @@ -108,7 +109,7 @@ void irq_gc_unmask_enable_reg(struct irq_data *d)
>> void irq_gc_ack_set_bit(struct irq_data *d)
>> {
>> struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>> - u32 mask = 1 << (d->irq - gc->irq_base);
>> + u32 mask = (1 << d->hwirq) % 32;
>>
>> irq_gc_lock(gc);
>> irq_reg_writel(mask, gc->reg_base + cur_regs(d)->ack);
>> @@ -122,10 +123,10 @@ void irq_gc_ack_set_bit(struct irq_data *d)
>> void irq_gc_ack_clr_bit(struct irq_data *d)
>> {
>> struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>> - u32 mask = ~(1 << (d->irq - gc->irq_base));
>> + u32 mask = (1 << d->hwirq) % 32;
>>
>> irq_gc_lock(gc);
>> - irq_reg_writel(mask, gc->reg_base + cur_regs(d)->ack);
>> + irq_reg_writel(~mask, gc->reg_base + cur_regs(d)->ack);
>> irq_gc_unlock(gc);
>> }
>>
>> @@ -136,7 +137,7 @@ void irq_gc_ack_clr_bit(struct irq_data *d)
>> void irq_gc_mask_disable_reg_and_ack(struct irq_data *d)
>> {
>> struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>> - u32 mask = 1 << (d->irq - gc->irq_base);
>> + u32 mask = (1 << d->hwirq) % 32;
>>
>> irq_gc_lock(gc);
>> irq_reg_writel(mask, gc->reg_base + cur_regs(d)->mask);
>> @@ -151,7 +152,7 @@ void irq_gc_mask_disable_reg_and_ack(struct irq_data *d)
>> void irq_gc_eoi(struct irq_data *d)
>> {
>> struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>> - u32 mask = 1 << (d->irq - gc->irq_base);
>> + u32 mask = (1 << d->hwirq) % 32;
>>
>> irq_gc_lock(gc);
>> irq_reg_writel(mask, gc->reg_base + cur_regs(d)->eoi);
>> @@ -169,7 +170,7 @@ void irq_gc_eoi(struct irq_data *d)
>> int irq_gc_set_wake(struct irq_data *d, unsigned int on)
>> {
>> struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>> - u32 mask = 1 << (d->irq - gc->irq_base);
>> + u32 mask = (1 << d->hwirq) % 32;
>>
>> if (!(mask & gc->wake_enabled))
>> return -EINVAL;
>> @@ -220,6 +221,18 @@ EXPORT_SYMBOL_GPL(irq_alloc_generic_chip);
>> */
>> static struct lock_class_key irq_nested_lock_class;
>>
>> +static void irq_gc_setup_irq(struct irq_chip_generic *gc, int irq)
>> +{
>> + struct irq_chip_type *ct = gc->chip_types;
>> +
>> + if (gc->flags & IRQ_GC_INIT_NESTED_LOCK)
>> + irq_set_lockdep_class(irq, &irq_nested_lock_class);
>> +
>> + irq_set_chip_and_handler(irq, &ct->chip, ct->handler);
>> + irq_set_chip_data(irq, gc);
>> + irq_modify_status(irq, gc->irq_clr, gc->irq_set);
>> +}
>> +
>> /**
>> * irq_setup_generic_chip - Setup a range of interrupts with a generic chip
>> * @gc: Generic irq chip holding all data
>> @@ -247,21 +260,115 @@ void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk,
>> if (flags & IRQ_GC_INIT_MASK_CACHE)
>> gc->mask_cache = irq_reg_readl(gc->reg_base + ct->regs.mask);
>>
>> + gc->flags = flags;
>> + gc->irq_clr = clr;
>> + gc->irq_set = set;
>> +
>> for (i = gc->irq_base; msk; msk >>= 1, i++) {
>> if (!(msk & 0x01))
>> continue;
>>
>> - if (flags & IRQ_GC_INIT_NESTED_LOCK)
>> - irq_set_lockdep_class(i, &irq_nested_lock_class);
>> -
>> - irq_set_chip_and_handler(i, &ct->chip, ct->handler);
>> - irq_set_chip_data(i, gc);
>> - irq_modify_status(i, clr, set);
>> + irq_gc_setup_irq(gc, i);
>> + irq_get_irq_data(i)->hwirq = i - gc->irq_base;
>> }
>> gc->irq_cnt = i - gc->irq_base;
>> }
>> EXPORT_SYMBOL_GPL(irq_setup_generic_chip);
>>
>> +#ifdef CONFIG_IRQ_DOMAIN
>> +static int irq_gc_irq_domain_map(struct irq_domain *d, unsigned int irq,
>> + irq_hw_number_t hw)
>> +{
>> + struct irq_chip_generic **gc_array = d->host_data;
>> + struct irq_chip_generic *gc = gc_array[hw / 32];
>> +
> This .map callback gets already called in irq_domain_add_legacy(),
> where gc_array has not been populated yet with the implementation
> below ...
>
>> + /* We need a valid irq number for suspend/resume functions */
>> + if ((int)gc->irq_base == -1)
>> + gc->irq_base = irq;
>> + irq_gc_setup_irq(gc, irq);
>> + return 0;
>> +}
>> +
>> +static struct irq_domain_ops irq_gc_irq_domain_ops = {
>> + .map = irq_gc_irq_domain_map,
>> + .xlate = irq_domain_xlate_onetwocell,
>> +};
>> +
>> +/*
>> + * irq_setup_generic_chip_domain - Setup a domain and N generic chips
>> + * @name: Name of the irq chip
>> + * @node: Device tree node pointer for domain
>> + * @num_ct: Number of irq_chip_type instances associated with this
>> + * @irq_base: Interrupt base nr for this chip
>> + * @reg_base: Register base address (virtual)
>> + * @handler: Default flow handler associated with this chip
>> + * @hwirq_cnt: Number of hw irqs for the domain
>> + * @flags: Flags for initialization
>> + * @clr: IRQ_* bits to clear
>> + * @set: IRQ_* bits to set
>> + * @gc_init_cb: Init callback function called for each generic irq chip created
>> + * @private Ptr to caller private data
>> + *
>> + * Set up an irq domain and N banks of 32 interrupts starting from gc->irq_base.
>> + * Note, this initializes all interrupts to the primary irq_chip_type and its
>> + * associated handler.
>> + */
>> +int irq_setup_generic_chip_domain(const char *name, struct device_node *node,
>> + int num_ct, unsigned int irq_base,
>> + void __iomem *reg_base,
>> + irq_flow_handler_t handler, u32 hwirq_cnt,
>> + enum irq_gc_flags flags, unsigned int clr,
>> + unsigned int set,
>> + void (*gc_init_cb)(struct irq_chip_generic *),
>> + void *private)
>> +{
>> + int ret, i;
>> + u32 msk = 0;
>> + struct irq_chip_generic **gc;
>> + struct irq_domain *d;
>> + int num_gc = (hwirq_cnt + 31) / 32;
>> +
>> + gc = kzalloc(num_gc * sizeof(struct irq_chip_generic *), GFP_KERNEL);
>> + if (!gc)
>> + return -ENOMEM;
>> +
>> + if (node)
>> + d = irq_domain_add_linear(node, hwirq_cnt, &irq_gc_irq_domain_ops, gc);
>> + else {
>> + msk = IRQ_MSK(32);
>> + d = irq_domain_add_legacy(node, hwirq_cnt, irq_base, 0,
>> + &irq_gc_irq_domain_ops, gc);
>> + }
>> +
> ... irq_domain_add_legacy() is called here for !node case ...
>
>> + for (i = 0; i < num_gc; i++) {
>> + gc[i] = irq_alloc_generic_chip(name, num_ct, irq_base,
>> + reg_base, handler);
>
> ... while gc[i] only gets populated here ...
>
> The following change seems fixing the problem for me.
>
> 8<---
> @@ -323,6 +324,7 @@ int irq_setup_generic_chip_domain(const char *name, struct device_node *node,
> void *private)
> {
> int ret, i;
> + unsigned int irqbase = irq_base;
> u32 msk = 0;
> struct irq_chip_generic **gc;
> struct irq_domain *d;
> @@ -332,16 +334,8 @@ int irq_setup_generic_chip_domain(const char *name, struct device_node *node,
> if (!gc)
> return -ENOMEM;
>
> - if (node)
> - d = irq_domain_add_linear(node, hwirq_cnt, &irq_gc_irq_domain_ops, gc);
> - else {
> - msk = IRQ_MSK(32);
> - d = irq_domain_add_legacy(node, hwirq_cnt, irq_base, 0,
> - &irq_gc_irq_domain_ops, gc);
> - }
> -
> for (i = 0; i < num_gc; i++) {
> - gc[i] = irq_alloc_generic_chip(name, num_ct, irq_base,
> + gc[i] = irq_alloc_generic_chip(name, num_ct, irqbase,
> reg_base, handler);
> if (!gc[i]) {
> ret = -ENOMEM;
> @@ -355,7 +349,15 @@ int irq_setup_generic_chip_domain(const char *name, struct device_node *node,
>
> irq_setup_generic_chip(gc[i], msk, flags, clr, set);
>
> - irq_base += node ? 0 : 32;
> + irqbase += node ? 0 : 32;
> + }
> +
> + if (node)
> + d = irq_domain_add_linear(node, hwirq_cnt, &irq_gc_irq_domain_ops, gc);
> + else {
> + msk = IRQ_MSK(32);
> + d = irq_domain_add_legacy(node, hwirq_cnt, irq_base, 0,
> + &irq_gc_irq_domain_ops, gc);
> }
>
> return 0;
> --->8
>
> Regards,
> Shawn
That looks like the correct fix to me. The irq chip does indeed need
to be set up before calling irq_domain_add_legacy().
g.
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