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Date: Thu, 8 Mar 2012 08:49:37 -0600
From: Dimitri Sivanich <sivanich@....com>
To: Jiang Liu <liuj97@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Tony Luck <tony.luck@...el.com>,
Fenghua Yu <fenghua.yu@...el.com>, Jes Sorensen <jes@....com>,
Ingo Molnar <mingo@...hat.com>,
"H . Peter Anvin" <hpa@...or.com>,
Suresh Siddha <suresh.b.siddha@...el.com>,
Yinghai Lu <yinghai@...nel.org>,
Thomas Meyer <thomas@...3r.de>,
Jiang Liu <jiang.liu@...wei.com>, linux-ia64@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-altix@....com, x86@...nel.org,
chenkeping@...wei.com
Subject: Re: [PATCH] IRQ: normalize chip->irq_set_affinity return value on
x86 and IA64
On Tue, Mar 06, 2012 at 11:01:52PM +0800, Jiang Liu wrote:
> On x86 and IA64 platforms, interrupt controller chip's irq_set_affinity()
> method always copies affinity mask to irq_data->affinity field but still
> returns 0(IRQ_SET_MASK_OK). That return value causes the interrupt core
> logic unnecessarily copies the mask to irq_data->affinity field again.
> So return IRQ_SET_MASK_OK_NOCOPY instead of IRQ_SET_MASK_OK to get rid of
> the duplicated copy operation.
>
> This patch applies to v3.3-rc6 and has been tested on x86 platforms.
>
> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
> ---
> arch/ia64/kernel/iosapic.c | 4 +++-
> arch/ia64/kernel/msi_ia64.c | 4 ++--
> arch/ia64/sn/kernel/irq.c | 2 +-
> arch/ia64/sn/kernel/msi_sn.c | 2 +-
> arch/x86/kernel/apic/io_apic.c | 11 ++++++-----
> arch/x86/platform/uv/uv_irq.c | 2 +-
> kernel/irq/internals.h | 3 +++
> kernel/irq/manage.c | 39 ++++++++++++++++++++++-----------------
> kernel/irq/migration.c | 6 +-----
> 9 files changed, 40 insertions(+), 33 deletions(-)
>
> diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
> index b0f9afe..98f5fa6 100644
> --- a/arch/ia64/kernel/iosapic.c
> +++ b/arch/ia64/kernel/iosapic.c
> @@ -374,8 +374,10 @@ iosapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
> iosapic_write(iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
> }
>
Maybe I haven't looked thoroughly enough, but could you point out where
the mask is being copied in this function?
> + return IRQ_SET_MASK_OK_NOCOPY;
> +#else
> + return IRQ_SET_MASK_OK;
> #endif
> - return 0;
> }
>
> /*
> diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
> index 94e0db7..e155770 100644
> --- a/arch/ia64/kernel/msi_ia64.c
> +++ b/arch/ia64/kernel/msi_ia64.c
> @@ -41,7 +41,7 @@ static int ia64_set_msi_irq_affinity(struct irq_data *idata,
> write_msi_msg(irq, &msg);
> cpumask_copy(idata->affinity, cpumask_of(cpu));
>
> - return 0;
> + return IRQ_SET_MASK_OK_NOCOPY;
> }
> #endif /* CONFIG_SMP */
>
> @@ -157,7 +157,7 @@ static int dmar_msi_set_affinity(struct irq_data *data,
> dmar_msi_write(irq, &msg);
> cpumask_copy(data->affinity, mask);
>
> - return 0;
> + return IRQ_SET_MASK_OK_NOCOPY;
> }
> #endif /* CONFIG_SMP */
>
> diff --git a/arch/ia64/sn/kernel/irq.c b/arch/ia64/sn/kernel/irq.c
> index dfac09a..f444208 100644
> --- a/arch/ia64/sn/kernel/irq.c
> +++ b/arch/ia64/sn/kernel/irq.c
> @@ -216,7 +216,7 @@ static int sn_set_affinity_irq(struct irq_data *data,
> sn_irq_lh[irq], list)
> (void)sn_retarget_vector(sn_irq_info, nasid, slice);
Again, could you point out where the mask is being copied in this function?
>
> - return 0;
> + return IRQ_SET_MASK_OK_NOCOPY;
> }
>
> #ifdef CONFIG_SMP
> diff --git a/arch/ia64/sn/kernel/msi_sn.c b/arch/ia64/sn/kernel/msi_sn.c
> index 2b98b9e..ebb5b55 100644
> --- a/arch/ia64/sn/kernel/msi_sn.c
> +++ b/arch/ia64/sn/kernel/msi_sn.c
> @@ -208,7 +208,7 @@ static int sn_set_msi_irq_affinity(struct irq_data *data,
> write_msi_msg(irq, &msg);
> cpumask_copy(data->affinity, cpu_mask);
>
> - return 0;
> + return IRQ_SET_MASK_OK_NOCOPY;
> }
> #endif /* CONFIG_SMP */
>
> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index fb07275..a81f888 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -2346,6 +2346,7 @@ ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
> /* Only the high 8 bits are valid. */
> dest = SET_APIC_LOGICAL_ID(dest);
> __target_IO_APIC_irq(irq, dest, data->chip_data);
> + ret = IRQ_SET_MASK_OK_NOCOPY;
> }
> raw_spin_unlock_irqrestore(&ioapic_lock, flags);
> return ret;
> @@ -2404,7 +2405,7 @@ ir_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
> send_cleanup_vector(cfg);
>
> cpumask_copy(data->affinity, mask);
> - return 0;
> + return IRQ_SET_MASK_OK_NOCOPY;
> }
>
> #else
> @@ -3209,7 +3210,7 @@ msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
>
> __write_msi_msg(data->msi_desc, &msg);
>
> - return 0;
> + return IRQ_SET_MASK_OK_NOCOPY;
> }
> #endif /* CONFIG_SMP */
>
> @@ -3366,7 +3367,7 @@ dmar_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
>
> dmar_msi_write(irq, &msg);
>
> - return 0;
> + return IRQ_SET_MASK_OK_NOCOPY;
> }
>
> #endif /* CONFIG_SMP */
> @@ -3419,7 +3420,7 @@ static int hpet_msi_set_affinity(struct irq_data *data,
>
> hpet_msi_write(data->handler_data, &msg);
>
> - return 0;
> + return IRQ_SET_MASK_OK_NOCOPY;
> }
>
> #endif /* CONFIG_SMP */
> @@ -3499,7 +3500,7 @@ ht_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
> return -1;
>
> target_ht_irq(data->irq, dest, cfg->vector);
> - return 0;
> + return IRQ_SET_MASK_OK_NOCOPY;
> }
>
> #endif
> diff --git a/arch/x86/platform/uv/uv_irq.c b/arch/x86/platform/uv/uv_irq.c
> index f25c276..a22c416 100644
> --- a/arch/x86/platform/uv/uv_irq.c
> +++ b/arch/x86/platform/uv/uv_irq.c
> @@ -222,7 +222,7 @@ uv_set_irq_affinity(struct irq_data *data, const struct cpumask *mask,
> if (cfg->move_in_progress)
> send_cleanup_vector(cfg);
>
> - return 0;
> + return IRQ_SET_MASK_OK_NOCOPY;
> }
>
> /*
> diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
> index b795231..2c49c40 100644
> --- a/kernel/irq/internals.h
> +++ b/kernel/irq/internals.h
> @@ -103,6 +103,9 @@ extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
>
> extern void irq_set_thread_affinity(struct irq_desc *desc);
>
> +extern int irq_do_set_affinity(struct irq_data *data,
> + const struct cpumask *dest, bool force);
> +
> /* Inline functions for support of irq chips on slow busses */
> static inline void chip_bus_lock(struct irq_desc *desc)
> {
> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> index a9a9dbe..b410b0b 100644
> --- a/kernel/irq/manage.c
> +++ b/kernel/irq/manage.c
> @@ -139,6 +139,25 @@ static inline void
> irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { }
> #endif
>
> +int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
> + bool force)
> +{
> + struct irq_desc *desc = irq_data_to_desc(data);
> + struct irq_chip *chip = irq_data_get_irq_chip(data);
> + int ret;
> +
> + ret = chip->irq_set_affinity(data, mask, false);
> + switch (ret) {
> + case IRQ_SET_MASK_OK:
> + cpumask_copy(data->affinity, mask);
> + case IRQ_SET_MASK_OK_NOCOPY:
> + irq_set_thread_affinity(desc);
> + ret = 0;
> + }
> +
> + return ret;
> +}
> +
> int __irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask)
> {
> struct irq_chip *chip = irq_data_get_irq_chip(data);
> @@ -149,14 +168,7 @@ int __irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask)
> return -EINVAL;
>
> if (irq_can_move_pcntxt(data)) {
> - ret = chip->irq_set_affinity(data, mask, false);
> - switch (ret) {
> - case IRQ_SET_MASK_OK:
> - cpumask_copy(data->affinity, mask);
> - case IRQ_SET_MASK_OK_NOCOPY:
> - irq_set_thread_affinity(desc);
> - ret = 0;
> - }
> + ret = irq_do_set_affinity(data, mask, false);
> } else {
> irqd_set_move_pending(data);
> irq_copy_pending(desc, mask);
> @@ -280,9 +292,7 @@ EXPORT_SYMBOL_GPL(irq_set_affinity_notifier);
> static int
> setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask)
> {
> - struct irq_chip *chip = irq_desc_get_chip(desc);
> struct cpumask *set = irq_default_affinity;
> - int ret;
>
> /* Excludes PER_CPU and NO_BALANCE interrupts */
> if (!irq_can_set_affinity(irq))
> @@ -301,13 +311,8 @@ setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask)
> }
>
> cpumask_and(mask, cpu_online_mask, set);
> - ret = chip->irq_set_affinity(&desc->irq_data, mask, false);
> - switch (ret) {
> - case IRQ_SET_MASK_OK:
> - cpumask_copy(desc->irq_data.affinity, mask);
> - case IRQ_SET_MASK_OK_NOCOPY:
> - irq_set_thread_affinity(desc);
> - }
> + irq_do_set_affinity(&desc->irq_data, mask, false);
> +
> return 0;
> }
> #else
> diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
> index 4742090..ef04dab 100644
> --- a/kernel/irq/migration.c
> +++ b/kernel/irq/migration.c
> @@ -44,11 +44,7 @@ void irq_move_masked_irq(struct irq_data *idata)
> */
> if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
> < nr_cpu_ids))
> - if (!chip->irq_set_affinity(&desc->irq_data,
> - desc->pending_mask, false)) {
> - cpumask_copy(desc->irq_data.affinity, desc->pending_mask);
> - irq_set_thread_affinity(desc);
> - }
> + irq_do_set_affinity(&desc->irq_data, desc->pending_mask, false);
>
> cpumask_clear(desc->pending_mask);
> }
> --
> 1.7.5.4
>
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