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Date:   Wed, 29 Mar 2017 17:50:52 +0200
From:   Mason <slash.tmp@...e.fr>
To:     Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Marc Gonzalez <marc_gonzalez@...madesigns.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Liviu Dudau <liviu.dudau@....com>,
        David Laight <david.laight@...lab.com>,
        linux-pci <linux-pci@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Thibaud Cornic <thibaud_cornic@...madesigns.com>,
        Phuong Nguyen <phuong_nguyen@...madesigns.com>,
        LKML <linux-kernel@...r.kernel.org>,
        DT <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] PCI: Add tango MSI controller support

On 29/03/2017 15:16, Mason wrote:

> But I don't understand how to get my pcie pointer back in irq_ack
> or irq_unmask, or the relevant msi. Can you throw me a clue?

Let's see... the irq_chip call-backs receive an irq_data pointer.

struct irq_data - per irq chip data passed down to chip functions
struct irq_chip - hardware interrupt chip descriptor

irq_data contains a void *chip_data member.
Can I use chip_data to stash a struct tango_pcie pointer?

/**
 *	irq_set_chip_data - set irq chip data for an irq
 *	@irq:	Interrupt number
 *	@data:	Pointer to chip specific data
 *
 *	Set the hardware irq chip data for an irq
 */
int irq_set_chip_data(unsigned int irq, void *data)

But where would I call it? And for which irq?


Otherwise, I found by trial-and-error that I can reach pcie through

data->domain->parent->host_data

data->domain == msi_dom
msi_dom->parent == irq_dom
irq_dom->host_data == pcie

But data->irq and data->hwirq don't hold the MSI index :-(

I suppose I have to ask for some mapping?

Regards.

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