Re: [PATCH 2/5] ata: libahci_platform: Support per-port interrupts

From: Miquel Raynal <miquel.raynal@bootlin•com>
To: Hans de Goede <hdegoede@redhat•com>
Cc: Mark Rutland <mark.rutland@arm•com>, Andrew Lunn <andrew@lunn•ch>,
	Jason Cooper <jason@lakedaemon•net>,
	devicetree@vger•kernel.org, Marc Zyngier <marc.zyngier@arm•com>,
	Gregory Clement <gregory.clement@bootlin•com>,
	Maxime Chevallier <maxime.chevallier@bootlin•com>,
	Nadav Haklai <nadavh@marvell•com>,
	linux-ide@vger•kernel.org, Rob Herring <robh+dt@kernel•org>,
	Antoine Tenart <antoine.tenart@bootlin•com>,
	Jens Axboe <axboe@kernel•dk>,
	Thomas Petazzoni <thomas.petazzoni@bootlin•com>,
	Thomas Gleixner <tglx@linutronix•de>,
	linux-arm-kernel@lists•infradead.org,
	Sebastian Hesselbarth <sebastian.hesselbarth@gmail•com>
Subject: Re: [PATCH 2/5] ata: libahci_platform: Support per-port interrupts
Date: Fri, 22 Feb 2019 17:03:48 +0100	[thread overview]
Message-ID: <20190222170348.12e45f42@xps13> (raw)
In-Reply-To: <c847985c-7117-6b31-ae78-4467871714c8@redhat.com>

Hi Hans,

Hans de Goede <hdegoede@redhat•com> wrote on Fri, 22 Feb 2019 16:52:55
+0100:

> Hi,
> 
> On 2/22/19 4:31 PM, Miquel Raynal wrote:
> > Hi Hans,
> > 
> > Hans de Goede <hdegoede@redhat•com> wrote on Fri, 22 Feb 2019 16:26:01
> > +0100:
> >   
> >> Hi,
> >>
> >> On 2/22/19 3:53 PM, Miquel Raynal wrote:  
> >>> Right now the ATA core only allows IPs to use a single interrupt. Some
> >>> of them (for instance the Armada-CP110 one) actually has one interrupt
> >>> per port. Add some logic to support such situation.
> >>>
> >>> We consider that either there is one single interrupt declared in the
> >>> main IP node, or there are per-port interrupts, each of them being
> >>> declared in the port sub-nodes.
> >>>
> >>> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin•com>
> >>> ---
> >>>    drivers/ata/acard-ahci.c       |  2 +-
> >>>    drivers/ata/ahci.c             |  2 +-
> >>>    drivers/ata/ahci.h             |  3 +-
> >>>    drivers/ata/libahci.c          |  2 +-
> >>>    drivers/ata/libahci_platform.c | 66 ++++++++++++++++++++++++++++------
> >>>    drivers/ata/sata_highbank.c    |  2 +-
> >>>    6 files changed, 61 insertions(+), 16 deletions(-)
> >>>
> >>> diff --git a/drivers/ata/acard-ahci.c b/drivers/ata/acard-ahci.c
> >>> index 583e366be7e2..9414b81e994c 100644
> >>> --- a/drivers/ata/acard-ahci.c
> >>> +++ b/drivers/ata/acard-ahci.c
> >>> @@ -434,7 +434,7 @@ static int acard_ahci_init_one(struct pci_dev *pdev, const struct pci_device_id
> >>>    	if (!hpriv)
> >>>    		return -ENOMEM;  
> >>>    > -	hpriv->irq = pdev->irq;  
> >>> +	hpriv->irqs[0] = pdev->irq;
> >>>    	hpriv->flags |= (unsigned long)pi.private_data;  
> >>>      >> What code-path is going to alloc hpriv->irqs for drivers using this code-path  
> >> which are not using libahci_platform .c ?  
> > 
> > I don't understand the question (or the remark behind the question),
> > can you explain a little bit more what you have in mind?  
> 
> Sorry I got the code context wrong I meant to put that comment below this chunk:
> 
>  > diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
>  > index 021ce46e2e57..18bce556d85f 100644
>  > --- a/drivers/ata/ahci.c
>  > +++ b/drivers/ata/ahci.c
>  > @@ -1817,7 +1817,7 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>  >   		/* legacy intx interrupts */
>  >   		pci_intx(pdev, 1);
>  >   	}
>  > -	hpriv->irq = pci_irq_vector(pdev, 0);
>  > +	hpriv->irqs[0] = pci_irq_vector(pdev, 0);
>  >
>  >   	if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
>  >   		host->flags |= ATA_HOST_PARALLEL_SCAN;  
> 
> 
> Which AFAIK is a common code-path also used by ahci drivers not using
> libahci_platform, and in that case hpriv->irqs will be NULL as nothing
> initializes it.

Oh I see. What do you prefer:
1/
* I add "irqs" besides "irq" in the structure
* copy the value of irq in irqs[0]
* use irqs instead of irq in the libahci_platform ?
or
2/
* Allocated one irq there if there is none ?

Thanks,
Miquèl

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