linux-kernel - Re: [Patch v2] Make PCI extended config space (MMCONFIG) a driver opt-in

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Message-ID: <20080113090108.3224698c@laptopd505.fenrus.org>
Date:	Sun, 13 Jan 2008 09:01:08 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Greg KH <greg@...ah.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	Jeff Garzik <jeff@...zik.org>,
	linux-pci@...ey.karlin.mff.cuni.cz, Martin Mares <mj@....cz>,
	Tony Camuso <tcamuso@...hat.com>, Loic Prylli <loic@...i.com>
Subject: Re: [Patch v2] Make PCI extended config space (MMCONFIG) a driver
 opt-in

as a general thing I like where this patch is going

On Sun, 13 Jan 2008 00:24:15 -0700
Matthew Wilcox <matthew@....cx> wrote:
> +
> +int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int
> devfn,
> +						int reg, int len,
> u32 *val) +{
> +	if (reg < 256)
> +		return raw_pci_ops->read(domain, bus, devfn, reg,
> len, val);
> +	if (raw_pci_ext_ops)
> +		return raw_pci_ext_ops->read(domain, bus, devfn,
> reg, len, val);
> +	return -EINVAL;

would be nice the "reg > 256 && raw_pci_Ext_ops==NULL" case would just
call the raw_pci_ops-> pointer, to give that a chance of refusal
(but I guess that shouldn't really happen)

> --- a/arch/x86/pci/mmconfig-shared.c
> +++ b/arch/x86/pci/mmconfig-shared.c
> @@ -28,7 +28,7 @@ static int __initdata pci_mmcfg_resources_inserted;
>  static const char __init *pci_mmcfg_e7520(void)
>  {
>  	u32 win;
> -	pci_conf1_read(0, 0, PCI_DEVFN(0,0), 0xce, 2, &win);
> +	pci_direct_conf1.read(0, 0, PCI_DEVFN(0,0), 0xce, 2, &win);

	couldn't this (at least in some next patch) use the vector if it exists?

\

> @@ -140,5 +134,6 @@ int __init pci_mmcfg_arch_init(void)
>  {
>  	printk(KERN_INFO "PCI: Using MMCONFIG\n");
>  	raw_pci_ops = &pci_mmcfg;
> +	raw_pci_ext_ops = &pci_mmcfg;

why set BOTH vectors? you probably ONLY want to set the ext one, so 
that calls to the lower 256 go to the original

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