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Message-ID: <4B9A954A.40205@kernel.org>
Date: Fri, 12 Mar 2010 11:26:02 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Ian Campbell <ian.campbell@...rix.com>
CC: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Jeremy Fitzhardinge <jeremy@...p.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>, x86@...nel.org,
linuxppc-dev@...abs.org
Subject: Re: [PATCH] irq: move some interrupt arch_* functions into struct
irq_chip.
On 03/12/2010 01:45 AM, Ian Campbell wrote:
> Move arch_init_copy_chip_data and arch_free_chip_data into function
> pointers in struct irq_chip since they operate on irq_desc->chip_data.
>
> arch_init_chip_data cannot be moved into struct irq_chip at this time
> because irq_desc->chip is not known at the time the irq_desc is
> setup. For now rename arch_init_chip_data to arch_init_irq_desc (for
> PowerPC, the only other user, whose usage better matches the new name)
> and on x86 convert arch_init_chip_data to x86_init_chip_data and
> call this whenever a new struct irq_desc is allocated.
>
> I've retained the chip_data behaviour for uv_irq although it isn't
> clear to me if these interrupt types support migration or how closely
> related to the APIC modes they really are. If it weren't for this the
> x86_{init,copy,free}_chip_data functions could be static to
> io_apic.c.
>
> I've tested by booting on a 64 bit system, but it's not clear to me
> what actions I need to take to actually exercise some of these code
> paths.
>
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
> Acked-by: Michael Ellerman <michael@...erman.id.au> [PowerPC rename portion]
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: Eric W. Biederman <ebiederm@...ssion.com>
> Cc: Yinghai Lu <yinghai@...nel.org>
> Cc: Jeremy Fitzhardinge <jeremy@...p.org>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: x86@...nel.org
> Cc: linuxppc-dev@...abs.org
> Cc: linux-kernel@...r.kernel.org
> ---
> arch/powerpc/kernel/irq.c | 2 +-
> arch/x86/include/asm/hw_irq.h | 11 +++++++-
> arch/x86/kernel/apic/io_apic.c | 58 +++++++++++++++++++++++++++++++++++++---
> arch/x86/kernel/uv_irq.c | 5 +++
> include/linux/interrupt.h | 2 +-
> include/linux/irq.h | 12 +++++---
> kernel/irq/handle.c | 2 +-
> kernel/irq/numa_migrate.c | 12 +++++++-
> kernel/softirq.c | 3 +-
> 9 files changed, 91 insertions(+), 16 deletions(-)
>
> diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
> index 64f6f20..002d87f 100644
> --- a/arch/powerpc/kernel/irq.c
> +++ b/arch/powerpc/kernel/irq.c
> @@ -1088,7 +1088,7 @@ int arch_early_irq_init(void)
> return 0;
> }
>
> -int arch_init_chip_data(struct irq_desc *desc, int node)
> +int arch_init_irq_desc(struct irq_desc *desc, int node)
> {
> desc->status |= IRQ_NOREQUEST;
> return 0;
> diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
> index a929c9e..1bc7063 100644
> --- a/arch/x86/include/asm/hw_irq.h
> +++ b/arch/x86/include/asm/hw_irq.h
> @@ -20,9 +20,9 @@
> #include <linux/percpu.h>
> #include <linux/profile.h>
> #include <linux/smp.h>
> +#include <linux/irq.h>
>
> #include <asm/atomic.h>
> -#include <asm/irq.h>
> #include <asm/sections.h>
>
> /* Interrupt handlers registered during init_IRQ */
> @@ -61,6 +61,15 @@ extern void init_VISWS_APIC_irqs(void);
> extern void setup_IO_APIC(void);
> extern void disable_IO_APIC(void);
>
> +extern int x86_init_chip_data(struct irq_desc *desc, int node);
> +
> +#ifdef CONFIG_SPARSE_IRQ
> +extern void x86_copy_chip_data(struct irq_desc *old_desc,
> + struct irq_desc *desc, int node);
> +extern void x86_free_chip_data(struct irq_desc *old_desc,
> + struct irq_desc *desc);
> +#endif
> +
> struct io_apic_irq_attr {
> int ioapic;
> int ioapic_pin;
> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index e4e0ddc..12e5cf4 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -211,7 +211,7 @@ static struct irq_cfg *get_one_free_irq_cfg(int node)
> return cfg;
> }
>
> -int arch_init_chip_data(struct irq_desc *desc, int node)
> +int x86_init_chip_data(struct irq_desc *desc, int node)
> {
> struct irq_cfg *cfg;
>
> @@ -287,8 +287,8 @@ static void free_irq_2_pin(struct irq_cfg *old_cfg, struct irq_cfg *cfg)
> old_cfg->irq_2_pin = NULL;
> }
>
> -void arch_init_copy_chip_data(struct irq_desc *old_desc,
> - struct irq_desc *desc, int node)
> +void x86_copy_chip_data(struct irq_desc *old_desc,
> + struct irq_desc *desc, int node)
> {
> struct irq_cfg *cfg;
> struct irq_cfg *old_cfg;
> @@ -312,7 +312,7 @@ static void free_irq_cfg(struct irq_cfg *old_cfg)
> kfree(old_cfg);
> }
>
> -void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc)
> +void x86_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc)
> {
> struct irq_cfg *old_cfg, *cfg;
>
> @@ -336,6 +336,11 @@ struct irq_cfg *irq_cfg(unsigned int irq)
> return irq < nr_irqs ? irq_cfgx + irq : NULL;
> }
>
> +int x86_init_chip_data(struct irq_desc *desc, int node)
> +{
> + return 0;
> +}
> +
you could put one dummy x86_copy_chip_data and x86_free_chip_data here too.
> #endif
>
> struct io_apic {
> @@ -1520,6 +1525,7 @@ static void __init setup_IO_APIC_irqs(void)
> printk(KERN_INFO "can not get irq_desc for %d\n", irq);
> continue;
> }
> + x86_init_chip_data(desc, node);
> cfg = desc->chip_data;
> add_pin_to_irq_node(cfg, node, apic_id, pin);
> /*
> @@ -1570,6 +1576,7 @@ void setup_IO_APIC_irq_extra(u32 gsi)
> printk(KERN_INFO "can not get irq_desc for %d\n", irq);
> return;
> }
> + x86_init_chip_data(desc, node);
>
> cfg = desc->chip_data;
> add_pin_to_irq_node(cfg, node, apic_id, pin);
> @@ -2739,6 +2746,11 @@ static struct irq_chip ioapic_chip __read_mostly = {
> .set_affinity = set_ioapic_affinity_irq,
> #endif
> .retrigger = ioapic_retrigger_irq,
> +
> +#ifdef CONFIG_SPARSE_IRQ
> + .copy_chip_data = x86_copy_chip_data,
> + .free_chip_data = x86_free_chip_data,
> +#endif
> };
>
> static struct irq_chip ir_ioapic_chip __read_mostly = {
> @@ -2754,6 +2766,11 @@ static struct irq_chip ir_ioapic_chip __read_mostly = {
> #endif
> #endif
> .retrigger = ioapic_retrigger_irq,
> +
> +#ifdef CONFIG_SPARSE_IRQ
> + .copy_chip_data = x86_copy_chip_data,
> + .free_chip_data = x86_free_chip_data,
> +#endif
> };
>
> static inline void init_IO_APIC_traps(void)
> @@ -3261,6 +3278,7 @@ unsigned int create_irq_nr(unsigned int irq_want, int node)
> printk(KERN_INFO "can not get irq_desc for %d\n", new);
> continue;
> }
> + x86_init_chip_data(desc_new, node);
> cfg_new = desc_new->chip_data;
>
> if (cfg_new->vector != 0)
> @@ -3466,6 +3484,11 @@ static struct irq_chip msi_chip = {
> .set_affinity = set_msi_irq_affinity,
> #endif
> .retrigger = ioapic_retrigger_irq,
> +
> +#ifdef CONFIG_SPARSE_IRQ
> + .copy_chip_data = x86_copy_chip_data,
> + .free_chip_data = x86_free_chip_data,
> +#endif
> };
>
> static struct irq_chip msi_ir_chip = {
> @@ -3479,6 +3502,11 @@ static struct irq_chip msi_ir_chip = {
> #endif
> #endif
> .retrigger = ioapic_retrigger_irq,
> +
> +#ifdef CONFIG_SPARSE_IRQ
> + .copy_chip_data = x86_copy_chip_data,
> + .free_chip_data = x86_free_chip_data,
> +#endif
> };
>
> /*
> @@ -3638,6 +3666,11 @@ static struct irq_chip dmar_msi_type = {
> .set_affinity = dmar_msi_set_affinity,
> #endif
> .retrigger = ioapic_retrigger_irq,
> +
> +#ifdef CONFIG_SPARSE_IRQ
> + .copy_chip_data = x86_copy_chip_data,
> + .free_chip_data = x86_free_chip_data,
> +#endif
> };
>
> int arch_setup_dmar_msi(unsigned int irq)
> @@ -3695,6 +3728,11 @@ static struct irq_chip ir_hpet_msi_type = {
> #endif
> #endif
> .retrigger = ioapic_retrigger_irq,
> +
> +#ifdef CONFIG_SPARSE_IRQ
> + .copy_chip_data = x86_copy_chip_data,
> + .free_chip_data = x86_free_chip_data,
> +#endif
> };
>
> static struct irq_chip hpet_msi_type = {
> @@ -3706,6 +3744,11 @@ static struct irq_chip hpet_msi_type = {
> .set_affinity = hpet_msi_set_affinity,
> #endif
> .retrigger = ioapic_retrigger_irq,
> +
> +#ifdef CONFIG_SPARSE_IRQ
> + .copy_chip_data = x86_copy_chip_data,
> + .free_chip_data = x86_free_chip_data,
> +#endif
> };
>
> int arch_setup_hpet_msi(unsigned int irq, unsigned int id)
> @@ -3792,6 +3835,11 @@ static struct irq_chip ht_irq_chip = {
> .set_affinity = set_ht_irq_affinity,
> #endif
> .retrigger = ioapic_retrigger_irq,
> +
> +#ifdef CONFIG_SPARSE_IRQ
> + .copy_chip_data = x86_copy_chip_data,
> + .free_chip_data = x86_free_chip_data,
> +#endif
> };
>
> int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
> @@ -3919,6 +3967,7 @@ static int __io_apic_set_pci_routing(struct device *dev, int irq,
> printk(KERN_INFO "can not get irq_desc %d\n", irq);
> return 0;
> }
> + x86_init_chip_data(desc, node);
>
> pin = irq_attr->ioapic_pin;
> trigger = irq_attr->trigger;
> @@ -4313,6 +4362,7 @@ void __init pre_init_apic_IRQ0(void)
> phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid);
> #endif
> desc = irq_to_desc_alloc_node(0, 0);
> + x86_init_chip_data(desc, 0);
>
> setup_local_APIC();
>
> diff --git a/arch/x86/kernel/uv_irq.c b/arch/x86/kernel/uv_irq.c
> index ece73d8..df2c6d6 100644
> --- a/arch/x86/kernel/uv_irq.c
> +++ b/arch/x86/kernel/uv_irq.c
> @@ -55,6 +55,11 @@ struct irq_chip uv_irq_chip = {
> .eoi = uv_ack_apic,
> .end = uv_noop,
> .set_affinity = uv_set_irq_affinity,
> +
> +#ifdef CONFIG_SPARSE_IRQ
> + .copy_chip_data = x86_copy_chip_data,
> + .free_chip_data = x86_free_chip_data,
> +#endif
> };
>
> /*
> diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
> index 75f3f00..cc4cd22 100644
> --- a/include/linux/interrupt.h
> +++ b/include/linux/interrupt.h
> @@ -611,6 +611,6 @@ struct irq_desc;
> extern int early_irq_init(void);
> extern int arch_probe_nr_irqs(void);
> extern int arch_early_irq_init(void);
> -extern int arch_init_chip_data(struct irq_desc *desc, int node);
> +extern int arch_init_irq_desc(struct irq_desc *desc, int node);
>
> #endif
> diff --git a/include/linux/irq.h b/include/linux/irq.h
> index 707ab12..558bd2d 100644
> --- a/include/linux/irq.h
> +++ b/include/linux/irq.h
> @@ -131,6 +131,14 @@ struct irq_chip {
> void (*bus_lock)(unsigned int irq);
> void (*bus_sync_unlock)(unsigned int irq);
>
> + /* for move_irq_desc */
> +#ifdef CONFIG_SPARSE_IRQ
> + void (*copy_chip_data)(struct irq_desc *old_desc,
> + struct irq_desc *desc, int node);
> + void (*free_chip_data)(struct irq_desc *old_desc,
> + struct irq_desc *desc);
> +#endif
> +
> /* Currently used only by UML, might disappear one day.*/
> #ifdef CONFIG_IRQ_RELEASE_METHOD
> void (*release)(unsigned int irq, void *dev_id);
> @@ -208,10 +216,6 @@ struct irq_desc {
> const char *name;
> } ____cacheline_internodealigned_in_smp;
>
> -extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
> - struct irq_desc *desc, int node);
> -extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
> -
> #ifndef CONFIG_SPARSE_IRQ
> extern struct irq_desc irq_desc[NR_IRQS];
> #endif
> diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
> index 76d5a67..168e2f8 100644
> --- a/kernel/irq/handle.c
> +++ b/kernel/irq/handle.c
> @@ -120,7 +120,6 @@ static void init_one_irq_desc(int irq, struct irq_desc *desc, int node)
> BUG_ON(1);
> }
> init_desc_masks(desc);
> - arch_init_chip_data(desc, node);
> }
>
> /*
> @@ -228,6 +227,7 @@ struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
> BUG_ON(1);
> }
> init_one_irq_desc(irq, desc, node);
> + arch_init_irq_desc(desc, node);
you move out init_chip_data for x86 out of irq_to_desc_alloc_node
current init_chip_data in irq_to_desc_alloc_node is protected by sparse_irq_lock.
wonder if you could let arch_init_irq_desc for x86 to call x86_init_chip_data?
or let add another irq_to_desc_alloc_node_f to take extra func call.
like
typedef int (*init_chip_data_f)(struct irq_desc *desc, int node);
struct irq_desc * __ref irq_to_desc_alloc_node_f(unsigned int irq, int node, init_chip_data_f *f);
struct irq_desc * __ref irq_to_desc_alloc_node_f(unsigned int irq, int node)
{
irq_to_desc_alloc_node(irq, node, NULL);
}
then for x86
int arch_init_irq_desc(struct irq_desc *desc, int node, init_chip_data_f *f)
{
if (!f)
return x86_init_chip_data(desc, node);
f(desc, node);
}
after that xen could use
irq_to_desc_alloc_node_f(irq, node, xen_init_chip_data);
as need...
at last we don't need to call x86_init_chip_data everywhere.
Thanks
Yinghai
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