Patchwork [v2,10/26] x86, irq: Convert irq_2_pin list to generic list

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Submitter Yinghai Lu
Date Feb. 8, 2013, 7:28 p.m.
Message ID <1360351703-20571-11-git-send-email-yinghai@kernel.org>
Download mbox | patch
Permalink /patch/219280/
State Not Applicable
Headers show

Comments

Yinghai Lu - Feb. 8, 2013, 7:28 p.m.
Now irq_2_pin list is own grown list.
We can use generic list to replace it so we could generic helper
functions to operate it.

Also make free_irq_cfg() free irq_2_pin list to support coming ioapic
hotplug.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: Joerg Roedel <joro@8bytes.org>
---
 arch/x86/include/asm/hw_irq.h  |    2 +-
 arch/x86/kernel/apic/io_apic.c |   22 ++++++++++++----------
 2 files changed, 13 insertions(+), 11 deletions(-)
Konrad Rzeszutek Wilk - March 8, 2013, 7:50 p.m.
On Fri, Feb 08, 2013 at 11:28:07AM -0800, Yinghai Lu wrote:
> Now irq_2_pin list is own grown list.

I think you meant to say 'has its own list'. Not sure how
its growing?

> We can use generic list to replace it so we could generic helper
> functions to operate it.

You need to put the verb a bit earlier. Perhaps:

".. generic list to replace so that we can operate using
generic helper functions."

> 
> Also make free_irq_cfg() free irq_2_pin list to support coming ioapic
> hotplug.

If you have them ready - could you say the titles of the patches here?

> 
> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
> Cc: Joerg Roedel <joro@8bytes.org>
> ---
>  arch/x86/include/asm/hw_irq.h  |    2 +-
>  arch/x86/kernel/apic/io_apic.c |   22 ++++++++++++----------
>  2 files changed, 13 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
> index 10a78c3..69743f8 100644
> --- a/arch/x86/include/asm/hw_irq.h
> +++ b/arch/x86/include/asm/hw_irq.h
> @@ -121,7 +121,7 @@ struct irq_2_irte {
>   * Most irqs are mapped 1:1 with pins.
>   */
>  struct irq_cfg {
> -	struct irq_pin_list	*irq_2_pin;
> +	struct list_head	irq_2_pin;
>  	cpumask_var_t		domain;
>  	cpumask_var_t		old_domain;
>  	u8			vector;
> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index 4c1a726..d2b4988 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -66,7 +66,7 @@
>  #define __apicdebuginit(type) static type __init
>  
>  #define for_each_irq_pin(entry, head) \
> -	for (entry = head; entry; entry = entry->next)
> +	list_for_each_entry(entry, &head, list)
>  
>  /*
>   *      Is the SiS APIC rmw bug present ?
> @@ -176,8 +176,8 @@ void mp_save_irq(struct mpc_intsrc *m)
>  }
>  
>  struct irq_pin_list {
> +	struct list_head list;
>  	int apic, pin;
> -	struct irq_pin_list *next;
>  };
>  
>  static struct irq_pin_list *alloc_irq_pin_list(int node)
> @@ -213,6 +213,7 @@ int __init arch_early_irq_init(void)
>  	irq_reserve_irqs(0, legacy_pic->nr_legacy_irqs);
>  
>  	for (i = 0; i < count; i++) {
> +		INIT_LIST_HEAD(&cfg[i].irq_2_pin);
>  		irq_set_chip_data(i, &cfg[i]);
>  		zalloc_cpumask_var_node(&cfg[i].domain, GFP_KERNEL, node);
>  		zalloc_cpumask_var_node(&cfg[i].old_domain, GFP_KERNEL, node);
> @@ -245,6 +246,7 @@ static struct irq_cfg *alloc_irq_cfg(unsigned int irq, int node)
>  		goto out_cfg;
>  	if (!zalloc_cpumask_var_node(&cfg->old_domain, GFP_KERNEL, node))
>  		goto out_domain;
> +	INIT_LIST_HEAD(&cfg->irq_2_pin);
>  	return cfg;
>  out_domain:
>  	free_cpumask_var(cfg->domain);
> @@ -255,11 +257,15 @@ out_cfg:
>  
>  static void free_irq_cfg(unsigned int at, struct irq_cfg *cfg)
>  {
> +	struct irq_pin_list *entry, *tmp;
> +
>  	if (!cfg)
>  		return;
>  	irq_set_chip_data(at, NULL);
>  	free_cpumask_var(cfg->domain);
>  	free_cpumask_var(cfg->old_domain);
> +	list_for_each_entry_safe(entry, tmp, &cfg->irq_2_pin, list)
> +		kfree(entry);
>  	kfree(cfg);
>  }
>  
> @@ -420,15 +426,12 @@ static void ioapic_mask_entry(int apic, int pin)
>   */
>  static int __add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
>  {
> -	struct irq_pin_list **last, *entry;
> +	struct irq_pin_list *entry;
>  
>  	/* don't allow duplicates */
> -	last = &cfg->irq_2_pin;
> -	for_each_irq_pin(entry, cfg->irq_2_pin) {
> +	for_each_irq_pin(entry, cfg->irq_2_pin)
>  		if (entry->apic == apic && entry->pin == pin)
>  			return 0;
> -		last = &entry->next;
> -	}
>  
>  	entry = alloc_irq_pin_list(node);
>  	if (!entry) {
> @@ -439,7 +442,7 @@ static int __add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pi
>  	entry->apic = apic;
>  	entry->pin = pin;
>  
> -	*last = entry;
> +	list_add_tail(&entry->list, &cfg->irq_2_pin);
>  	return 0;
>  }
>  
> @@ -1622,8 +1625,7 @@ __apicdebuginit(void) print_IO_APICs(void)
>  		cfg = irq_get_chip_data(irq);
>  		if (!cfg)
>  			continue;
> -		entry = cfg->irq_2_pin;
> -		if (!entry)
> +		if (list_empty(&cfg->irq_2_pin))
>  			continue;
>  		printk(KERN_DEBUG "IRQ%d ", irq);
>  		for_each_irq_pin(entry, cfg->irq_2_pin)
> -- 
> 1.7.10.4
> 
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Yinghai Lu - March 8, 2013, 8 p.m.
On Fri, Mar 8, 2013 at 11:50 AM, Konrad Rzeszutek Wilk
<konrad.wilk@oracle.com> wrote:
> On Fri, Feb 08, 2013 at 11:28:07AM -0800, Yinghai Lu wrote:
>> Now irq_2_pin list is own grown list.
>
> I think you meant to say 'has its own list'. Not sure how
> its growing?
>
>> We can use generic list to replace it so we could generic helper
>> functions to operate it.
>
> You need to put the verb a bit earlier. Perhaps:
>
> ".. generic list to replace so that we can operate using
> generic helper functions."

missed use before generic helper.

>
>>
>> Also make free_irq_cfg() free irq_2_pin list to support coming ioapic
>> hotplug.
>
> If you have them ready - could you say the titles of the patches here?

list them all ?
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Konrad Rzeszutek Wilk - March 8, 2013, 8:13 p.m.
On Fri, Mar 08, 2013 at 12:00:43PM -0800, Yinghai Lu wrote:
> On Fri, Mar 8, 2013 at 11:50 AM, Konrad Rzeszutek Wilk
> <konrad.wilk@oracle.com> wrote:
> > On Fri, Feb 08, 2013 at 11:28:07AM -0800, Yinghai Lu wrote:
> >> Now irq_2_pin list is own grown list.
> >
> > I think you meant to say 'has its own list'. Not sure how
> > its growing?
> >
> >> We can use generic list to replace it so we could generic helper
> >> functions to operate it.
> >
> > You need to put the verb a bit earlier. Perhaps:
> >
> > ".. generic list to replace so that we can operate using
> > generic helper functions."
> 
> missed use before generic helper.

That would work as well.

> 
> >
> >>
> >> Also make free_irq_cfg() free irq_2_pin list to support coming ioapic
> >> hotplug.
> >
> > If you have them ready - could you say the titles of the patches here?
> 
> list them all ?

No that would not work. Perhaps the first one that introduces the code
that uses irq_2_pin ?
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Patch

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 10a78c3..69743f8 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -121,7 +121,7 @@  struct irq_2_irte {
  * Most irqs are mapped 1:1 with pins.
  */
 struct irq_cfg {
-	struct irq_pin_list	*irq_2_pin;
+	struct list_head	irq_2_pin;
 	cpumask_var_t		domain;
 	cpumask_var_t		old_domain;
 	u8			vector;
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 4c1a726..d2b4988 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -66,7 +66,7 @@ 
 #define __apicdebuginit(type) static type __init
 
 #define for_each_irq_pin(entry, head) \
-	for (entry = head; entry; entry = entry->next)
+	list_for_each_entry(entry, &head, list)
 
 /*
  *      Is the SiS APIC rmw bug present ?
@@ -176,8 +176,8 @@  void mp_save_irq(struct mpc_intsrc *m)
 }
 
 struct irq_pin_list {
+	struct list_head list;
 	int apic, pin;
-	struct irq_pin_list *next;
 };
 
 static struct irq_pin_list *alloc_irq_pin_list(int node)
@@ -213,6 +213,7 @@  int __init arch_early_irq_init(void)
 	irq_reserve_irqs(0, legacy_pic->nr_legacy_irqs);
 
 	for (i = 0; i < count; i++) {
+		INIT_LIST_HEAD(&cfg[i].irq_2_pin);
 		irq_set_chip_data(i, &cfg[i]);
 		zalloc_cpumask_var_node(&cfg[i].domain, GFP_KERNEL, node);
 		zalloc_cpumask_var_node(&cfg[i].old_domain, GFP_KERNEL, node);
@@ -245,6 +246,7 @@  static struct irq_cfg *alloc_irq_cfg(unsigned int irq, int node)
 		goto out_cfg;
 	if (!zalloc_cpumask_var_node(&cfg->old_domain, GFP_KERNEL, node))
 		goto out_domain;
+	INIT_LIST_HEAD(&cfg->irq_2_pin);
 	return cfg;
 out_domain:
 	free_cpumask_var(cfg->domain);
@@ -255,11 +257,15 @@  out_cfg:
 
 static void free_irq_cfg(unsigned int at, struct irq_cfg *cfg)
 {
+	struct irq_pin_list *entry, *tmp;
+
 	if (!cfg)
 		return;
 	irq_set_chip_data(at, NULL);
 	free_cpumask_var(cfg->domain);
 	free_cpumask_var(cfg->old_domain);
+	list_for_each_entry_safe(entry, tmp, &cfg->irq_2_pin, list)
+		kfree(entry);
 	kfree(cfg);
 }
 
@@ -420,15 +426,12 @@  static void ioapic_mask_entry(int apic, int pin)
  */
 static int __add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
 {
-	struct irq_pin_list **last, *entry;
+	struct irq_pin_list *entry;
 
 	/* don't allow duplicates */
-	last = &cfg->irq_2_pin;
-	for_each_irq_pin(entry, cfg->irq_2_pin) {
+	for_each_irq_pin(entry, cfg->irq_2_pin)
 		if (entry->apic == apic && entry->pin == pin)
 			return 0;
-		last = &entry->next;
-	}
 
 	entry = alloc_irq_pin_list(node);
 	if (!entry) {
@@ -439,7 +442,7 @@  static int __add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pi
 	entry->apic = apic;
 	entry->pin = pin;
 
-	*last = entry;
+	list_add_tail(&entry->list, &cfg->irq_2_pin);
 	return 0;
 }
 
@@ -1622,8 +1625,7 @@  __apicdebuginit(void) print_IO_APICs(void)
 		cfg = irq_get_chip_data(irq);
 		if (!cfg)
 			continue;
-		entry = cfg->irq_2_pin;
-		if (!entry)
+		if (list_empty(&cfg->irq_2_pin))
 			continue;
 		printk(KERN_DEBUG "IRQ%d ", irq);
 		for_each_irq_pin(entry, cfg->irq_2_pin)