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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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