linux-kernel - Re: [RFC PATCH v0.2] PCI: Add support for tango PCIe host bridge

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Message-ID: <b59b81ea-bc1b-bff5-4a78-8a69538b0de3@free.fr>
Date:   Tue, 11 Apr 2017 19:52:10 +0200
From:   Mason <slash.tmp@...e.fr>
To:     Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     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>
Subject: Re: [RFC PATCH v0.2] PCI: Add support for tango PCIe host bridge

On 11/04/2017 18:43, Marc Zyngier wrote:

> On 11/04/17 17:26, Mason wrote:
>
>> Is there a function to map virq to the hwirq in any domain?
> 
> Be more precise. If you want the hwirq associated with the view of a
> virq in a given domain, that's the hwirq field in the corresponding
> irq_data structure. Or are you after something else?

I registered an unmask method for my irq_chip.
(IIUC, I'm supposed to unmask a specific MSI in this callback.)

# cat /proc/interrupts 
           CPU0       CPU1       
 30:          0          0    MSIfoo      0 Edge      aerdrv
 34:          0          0    MSIfoo 524288 Edge      xhci_hcd
 35:          0          0    MSIfoo 524289 Edge      xhci_hcd
 36:          0          0    MSIfoo 524290 Edge      xhci_hcd


void foo_unmask(struct irq_data *data)
{
	int xx,yy;
	struct irq_domain *dom = data->domain;
	printk("%s: irq_data=%p irq=%u hwirq=%lu chip=%p dom=%p pdata=%p data=%p\n",
		__func__, data, data->irq, data->hwirq, data->chip, data->domain,
		data->parent_data, data->chip_data);
	printk("%s ops=%p data=%p parent=%p\n\n",
		dom->name, dom->ops, dom->host_data, dom->parent);
	printk("pcie=%p\n", dom->parent->host_data);
	//dump_stack();
	pci_msi_unmask_irq(data);
	struct tango_pcie *pcie = data->domain->parent->host_data;
	printk("\n%s: pcie=%p irq=%u hwirq=%lu\n\n",
		__func__, pcie, data->irq, data->hwirq);
	xx = irq_find_mapping(pcie->irq_domain, data->hwirq);
	yy = irq_find_mapping(pcie->msi_domain, data->hwirq);
	printk("xx=%d yy=%d\n", xx, yy);
}

so data->irq is the virq (30, 34, 35, 36)
and data->hwirq is the domain hwirq (0, 524288, 524289, 524290)

Is there a way to map hwirq 524288 to MSI 0, hwirq 524289 to MSI 1, etc?

Regards.