linux-kernel - Re: [PATCH] x86: fix: make PCI ECS for AMD CPUs hotplug capable

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Message-ID: <20080822190724.GB14103@erda.amd.com>
Date:	Fri, 22 Aug 2008 21:07:24 +0200
From:	Robert Richter <robert.richter@....com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Jan Beulich <jbeulich@...ell.com>
Subject: Re: [PATCH] x86: fix: make PCI ECS for AMD CPUs hotplug capable

On 22.08.08 11:56:08, Yinghai Lu wrote:

[...]

> > +static int __init pci_io_ecs_init(void)
> > +{
> > +       int cpu;
> > +
> >        /* assume all cpus from fam10h have IO ECS */
> >         if (boot_cpu_data.x86 < 0x10)
> >                return 0;
> > -       on_each_cpu(enable_pci_io_ecs_per_cpu, NULL, 1);
> > +
> > +       register_cpu_notifier(&amd_cpu_notifier);
> > +       for_each_online_cpu(cpu)
> > +               amd_cpu_notify(&amd_cpu_notifier, (unsigned long)CPU_ONLINE,
> > +                              (void *)(long)cpu);
> 
> wonder if those two lines should be reversed.

Do you mean setting PCI_HAS_IO_ECS before for_each_online_cpu(...)?
PCI_HAS_IO_ECS will be used only in pci_direct_init(). PCI is
initialized in a later init stage, so it doesn't matter. My intention
was to set the bit after the setup of all online cpus is finished.

-Robert

> 
> >        pci_probe |= PCI_HAS_IO_ECS;
> > +
> >        return 0;
> >  }
> >
> > @@ -591,7 +618,7 @@ static int __init amd_postcore_init(void)
> >                return 0;
> >
> >        early_fill_mp_bus_info();
> > -       enable_pci_io_ecs();
> > +       pci_io_ecs_init();
> >
> >        return 0;
> >  }
> > --
> > 1.5.6.4
> >
> >
> >
> 

-- 
Advanced Micro Devices, Inc.
Operating System Research Center
email: robert.richter@....com

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