On Sun, 03 Jul 2022 16:22:03 +0100,
Oleksandr <olekstysh@xxxxxxxxx> wrote:
>
>
> On 01.07.22 23:00, Samuel Holland wrote:
>
>
> Hello Samuel
>
> > Some architectures and irqchip drivers modify the cpumask returned by
> > irq_data_get_affinity_mask, usually by copying in to it. This is
> > problematic for uniprocessor configurations, where the affinity mask
> > should be constant, as it is known at compile time.
> >
> > Add and use a setter for the affinity mask, following the pattern of
> > irq_data_update_effective_affinity. This allows the getter function to
> > return a const cpumask pointer.
> >
> > Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx>
> > ---
> >
> > Changes in v3:
> > - New patch to introduce irq_data_update_affinity
> >
> > arch/alpha/kernel/irq.c | 2 +-
> > arch/ia64/kernel/iosapic.c | 2 +-
> > arch/ia64/kernel/irq.c | 4 ++--
> > arch/ia64/kernel/msi_ia64.c | 4 ++--
> > arch/parisc/kernel/irq.c | 2 +-
> > drivers/irqchip/irq-bcm6345-l1.c | 4 ++--
> > drivers/parisc/iosapic.c | 2 +-
> > drivers/sh/intc/chip.c | 2 +-
> > drivers/xen/events/events_base.c | 7 ++++---
> > include/linux/irq.h | 6 ++++++
> > 10 files changed, 21 insertions(+), 14 deletions(-)
> >
> > diff --git a/arch/alpha/kernel/irq.c b/arch/alpha/kernel/irq.c
> > index f6d2946edbd2..15f2effd6baf 100644
> > --- a/arch/alpha/kernel/irq.c
> > +++ b/arch/alpha/kernel/irq.c
> > @@ -60,7 +60,7 @@ int irq_select_affinity(unsigned int irq)
> > cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
> > last_cpu = cpu;
> > - cpumask_copy(irq_data_get_affinity_mask(data),
> > cpumask_of(cpu));
> > + irq_data_update_affinity(data, cpumask_of(cpu));
> > chip->irq_set_affinity(data, cpumask_of(cpu), false);
> > return 0;
> > }
> > diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
> > index 35adcf89035a..99300850abc1 100644
> > --- a/arch/ia64/kernel/iosapic.c
> > +++ b/arch/ia64/kernel/iosapic.c
> > @@ -834,7 +834,7 @@ iosapic_unregister_intr (unsigned int gsi)
> > if (iosapic_intr_info[irq].count == 0) {
> > #ifdef CONFIG_SMP
> > /* Clear affinity */
> > - cpumask_setall(irq_get_affinity_mask(irq));
> > + irq_data_update_affinity(irq_get_irq_data(irq), cpu_all_mask);
> > #endif
> > /* Clear the interrupt information */
> > iosapic_intr_info[irq].dest = 0;
> > diff --git a/arch/ia64/kernel/irq.c b/arch/ia64/kernel/irq.c
> > index ecef17c7c35b..275b9ea58c64 100644
> > --- a/arch/ia64/kernel/irq.c
> > +++ b/arch/ia64/kernel/irq.c
> > @@ -57,8 +57,8 @@ static char irq_redir [NR_IRQS]; // = { [0 ... NR_IRQS-1] = 1 };
> > void set_irq_affinity_info (unsigned int irq, int hwid, int redir)
> > {
> > if (irq < NR_IRQS) {
> > - cpumask_copy(irq_get_affinity_mask(irq),
> > - cpumask_of(cpu_logical_id(hwid)));
> > + irq_data_update_affinity(irq_get_irq_data(irq),
> > + cpumask_of(cpu_logical_id(hwid)));
> > irq_redir[irq] = (char) (redir & 0xff);
> > }
> > }
> > diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
> > index df5c28f252e3..025e5133c860 100644
> > --- a/arch/ia64/kernel/msi_ia64.c
> > +++ b/arch/ia64/kernel/msi_ia64.c
> > @@ -37,7 +37,7 @@ static int ia64_set_msi_irq_affinity(struct irq_data *idata,
> > msg.data = data;
> > pci_write_msi_msg(irq, &msg);
> > - cpumask_copy(irq_data_get_affinity_mask(idata), cpumask_of(cpu));
> > + irq_data_update_affinity(idata, cpumask_of(cpu));
> > return 0;
> > }
> > @@ -132,7 +132,7 @@ static int dmar_msi_set_affinity(struct irq_data *data,
> > msg.address_lo |= MSI_ADDR_DEST_ID_CPU(cpu_physical_id(cpu));
> > dmar_msi_write(irq, &msg);
> > - cpumask_copy(irq_data_get_affinity_mask(data), mask);
> > + irq_data_update_affinity(data, mask);
> > return 0;
> > }
> > diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
> > index 0fe2d79fb123..5ebb1771b4ab 100644
> > --- a/arch/parisc/kernel/irq.c
> > +++ b/arch/parisc/kernel/irq.c
> > @@ -315,7 +315,7 @@ unsigned long txn_affinity_addr(unsigned int irq, int cpu)
> > {
> > #ifdef CONFIG_SMP
> > struct irq_data *d = irq_get_irq_data(irq);
> > - cpumask_copy(irq_data_get_affinity_mask(d), cpumask_of(cpu));
> > + irq_data_update_affinity(d, cpumask_of(cpu));
> > #endif
> > return per_cpu(cpu_data, cpu).txn_addr;
> > diff --git a/drivers/irqchip/irq-bcm6345-l1.c b/drivers/irqchip/irq-bcm6345-l1.c
> > index 142a7431745f..6899e37810a8 100644
> > --- a/drivers/irqchip/irq-bcm6345-l1.c
> > +++ b/drivers/irqchip/irq-bcm6345-l1.c
> > @@ -216,11 +216,11 @@ static int bcm6345_l1_set_affinity(struct irq_data *d,
> > enabled = intc->cpus[old_cpu]->enable_cache[word] & mask;
> > if (enabled)
> > __bcm6345_l1_mask(d);
> > - cpumask_copy(irq_data_get_affinity_mask(d), dest);
> > + irq_data_update_affinity(d, dest);
> > if (enabled)
> > __bcm6345_l1_unmask(d);
> > } else {
> > - cpumask_copy(irq_data_get_affinity_mask(d), dest);
> > + irq_data_update_affinity(d, dest);
> > }
> > raw_spin_unlock_irqrestore(&intc->lock, flags);
> > diff --git a/drivers/parisc/iosapic.c b/drivers/parisc/iosapic.c
> > index 8a3b0c3a1e92..3a8c98615634 100644
> > --- a/drivers/parisc/iosapic.c
> > +++ b/drivers/parisc/iosapic.c
> > @@ -677,7 +677,7 @@ static int iosapic_set_affinity_irq(struct irq_data *d,
> > if (dest_cpu < 0)
> > return -1;
> > - cpumask_copy(irq_data_get_affinity_mask(d),
> > cpumask_of(dest_cpu));
> > + irq_data_update_affinity(d, cpumask_of(dest_cpu));
> > vi->txn_addr = txn_affinity_addr(d->irq, dest_cpu);
> > spin_lock_irqsave(&iosapic_lock, flags);
> > diff --git a/drivers/sh/intc/chip.c b/drivers/sh/intc/chip.c
> > index 358df7510186..828d81e02b37 100644
> > --- a/drivers/sh/intc/chip.c
> > +++ b/drivers/sh/intc/chip.c
> > @@ -72,7 +72,7 @@ static int intc_set_affinity(struct irq_data *data,
> > if (!cpumask_intersects(cpumask, cpu_online_mask))
> > return -1;
> > - cpumask_copy(irq_data_get_affinity_mask(data), cpumask);
> > + irq_data_update_affinity(data, cpumask);
> > return IRQ_SET_MASK_OK_NOCOPY;
> > }
> > diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
> > index 46d9295d9a6e..5e8321f43cbd 100644
> > --- a/drivers/xen/events/events_base.c
> > +++ b/drivers/xen/events/events_base.c
> > @@ -528,9 +528,10 @@ static void bind_evtchn_to_cpu(evtchn_port_t evtchn, unsigned int cpu,
> > BUG_ON(irq == -1);
> > if (IS_ENABLED(CONFIG_SMP) && force_affinity) {
> > - cpumask_copy(irq_get_affinity_mask(irq), cpumask_of(cpu));
> > - cpumask_copy(irq_get_effective_affinity_mask(irq),
> > - cpumask_of(cpu));
> > + struct irq_data *data = irq_get_irq_data(irq);
> > +
> > + irq_data_update_affinity(data, cpumask_of(cpu));
> > + irq_data_update_effective_affinity(data, cpumask_of(cpu));
> > }
>
>
>
> Nit: commit description says about reusing irq_data_update_affinity()
> only, but here we also reuse irq_data_update_effective_affinity(), so
> I would mention that in the description.
>
> Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx> # Xen bits
b4 shouts because of your email address:
NOTE: some trailers ignored due to from/email mismatches:
! Trailer: Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx> # Xen bits
Msg From: Oleksandr <olekstysh@xxxxxxxxx>
I've used the tag anyway, but you may want to fix your setup in the
future.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
