linux-kernel - Re: [PATCH v13 06/13] irqchip: Add RISC-V incoming MSI controller early driver

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Date: Wed, 21 Feb 2024 12:59:22 +0100
From: Björn Töpel <bjorn@...nel.org>
To: Anup Patel <apatel@...tanamicro.com>
Cc: Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley
 <paul.walmsley@...ive.com>, Thomas Gleixner <tglx@...utronix.de>, Rob
 Herring <robh+dt@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Frank Rowand
 <frowand.list@...il.com>, Conor Dooley <conor+dt@...nel.org>,
 devicetree@...r.kernel.org, Saravana Kannan <saravanak@...gle.com>, Marc
 Zyngier <maz@...nel.org>, Anup Patel <anup@...infault.org>,
 linux-kernel@...r.kernel.org, Atish Patra <atishp@...shpatra.org>,
 linux-riscv@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 Andrew Jones <ajones@...tanamicro.com>
Subject: Re: [PATCH v13 06/13] irqchip: Add RISC-V incoming MSI controller
 early driver

Anup Patel <apatel@...tanamicro.com> writes:

>> > +void imsic_vector_mask(struct imsic_vector *vec)
>> > +{
>> > +     struct imsic_local_priv *lpriv;
>> > +
>> > +     lpriv = per_cpu_ptr(imsic->lpriv, vec->cpu);
>> > +     if (WARN_ON(&lpriv->vectors[vec->local_id] != vec))
>> > +             return;
>> > +
>> > +     /*
>> > +      * This function is called through Linux irq subsystem with
>> > +      * irqs disabled so no need to save/restore irq flags.
>> > +      */
>> > +
>> > +     raw_spin_lock(&lpriv->lock);
>> > +
>> > +     vec->enable = false;
>> > +     bitmap_set(lpriv->dirty_bitmap, vec->local_id, 1);
>> > +     __imsic_remote_sync(lpriv, vec->cpu);
>> > +
>> > +     raw_spin_unlock(&lpriv->lock);
>> > +}
>>
>> Really nice that you're using a timer for the vector affinity change,
>> and got rid of the special/weird IMSIC/sync IPI. Can you really use a
>> timer for mask/unmask? That makes the mask/unmask operation
>> asynchronous!
>>
>> That was what I was trying to get though with this comment:
>> https://lore.kernel.org/linux-riscv/87sf24mo1g.fsf@all.your.base.are.belong.to.us/
>>
>> Also, using the smp_* IPI functions, you can pass arguments, so you
>> don't need the dirty_bitmap tracking the changes.
>
> The mask/unmask operations are called with irqs disabled so if
> CPU X does synchronous IPI to another CPU Y from mask/unmask
> operation then while CPU X is waiting for IPI to complete it cannot
> receive IPI from other CPUs which can lead to crashes and stalls.
>
> In general, we should not do any block/busy-wait work in
> mask/unmask operation of an irqchip driver.

Hmm, OK. Still, a bit odd that when the .irq_mask callback return, the
masking is not actually completed.

1. CPU 0 tries to mask an interrupt tried to CPU 1.
2. The timer is queued on CPU 1.
3. The call irq_mask returns on CPU 0
4. ...the irq is masked at some future point, determined by the callback
   at CPU 1

Is that the expected outcome?

There are .irq_mask implementation that does seem to go at length
(blocking) to perform the mask, e.g.: gic_mask_irq() which calls
gic_{re,}dist_wait_for_rwp that have sleep/retry loops. The GIC3 ITS
code has similar things going on.

I'm not saying you're wrong, I'm just trying to wrap my head around the
masking semantics.

> The AIA IMSIC spec allows setting ID pending bit using MSI write
> irrespective whether ID is enabled or not but the interrupt will be
> taken only after ID is enabled. In other words, there will be no
> loss of interrupt with delayed mask/unmask using async IPI or
> lazy timer.

No loss, but we might *get* an interrupt when we explicitly asked not to
get any. Maybe that's ok?


Björn