linux-kernel - Re: [RFC 0/4] Introduce a mechanism to allocate PCI IRQ on demand

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Date:	Wed, 20 May 2015 11:21:51 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Lv Zheng <lv.zheng@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, "x86 @ kernel . org" <x86@...nel.org>
Subject: Re: [RFC 0/4] Introduce a mechanism to allocate PCI IRQ on demand

On 2015/5/19 21:35, Thomas Gleixner wrote:
> On Thu, 7 May 2015, Jiang Liu wrote:
> 
>> This patch set introduces a mechanism to allocate PCI IRQ on demand and
>> free it when not used anymore by hooking pci_device_probe() and
>> pci_device_remove().
>>
>> It will be used to track IOAPIC pin usage on x86 so we could support
>> IOAPIC hot-removal.
> 
> Bjorn, any opinion on this?
Hi Bjorn,
	With this patch applied, how about removing this workaround
from arch/x86/pci/irq.c?
-------------------------------------------------------------------
        if (io_apic_assign_pci_irqs && pci_routeirq) {
                struct pci_dev *dev = NULL;
                /*
                 * PCI IRQ routing is set up by pci_enable_device(), but we
                 * also do it here in case there are still broken
drivers that
                 * don't use pci_enable_device().
                 */
                printk(KERN_INFO "PCI: Routing PCI interrupts for all
devices because \"pci=routeirq\" specified\n");
                for_each_pci_dev(dev)
                        pirq_enable_irq(dev);
        }
-------------------------------------------------------
Thanks!
Gerry

> 
> Thanks,
> 
> 	tglx
> 
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