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Date: Mon, 28 Apr 2008 15:53:33 -0700
From: "Yinghai Lu" <yhlu.kernel@...il.com>
To: "Jesse Barnes" <jbarnes@...tuousgeek.org>
Cc: "Ingo Molnar" <mingo@...e.hu>,
"Linus Torvalds" <torvalds@...ux-foundation.org>,
linux-kernel@...r.kernel.org,
"Andrew Morton" <akpm@...ux-foundation.org>,
"Thomas Gleixner" <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [git pull] "big box" x86 changes, PCI
On Mon, Apr 28, 2008 at 1:34 PM, Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
> On Saturday, April 26, 2008 2:55 pm Ingo Molnar wrote:
>
>
> > @@ -184,51 +322,80 @@ static void __init pci_mmcfg_reject_broken(int type)
> >
> > cfg = &pci_mmcfg_config[0];
> >
> > - /*
> > - * Handle more broken MCFG tables on Asus etc.
> > - * They only contain a single entry for bus 0-0.
> > - */
> > - if (pci_mmcfg_config_num == 1 &&
> > - cfg->pci_segment == 0 &&
> > - (cfg->start_bus_number | cfg->end_bus_number) == 0) {
> > - printk(KERN_ERR "PCI: start and end of bus number is 0. "
> > - "Rejected as broken MCFG.\n");
> > - goto reject;
> > + for (i = 0; i < pci_mmcfg_config_num; i++) {
> > + int valid = 0;
> > + u32 size = (cfg->end_bus_number + 1) << 20;
> > + cfg = &pci_mmcfg_config[i];
> > + printk(KERN_NOTICE "PCI: MCFG configuration %d: base %lx "
> > + "segment %hu buses %u - %u\n",
> > + i, (unsigned long)cfg->address, cfg->pci_segment,
> > + (unsigned int)cfg->start_bus_number,
> > + (unsigned int)cfg->end_bus_number);
> > +
> > + if (!early &&
> > + is_acpi_reserved(cfg->address, cfg->address + size -
> > 1)) { + printk(KERN_NOTICE "PCI: MCFG area at %Lx
> > reserved " + "in ACPI motherboard
> > resources\n",
> > + cfg->address);
> > + valid = 1;
> > + }
> > +
> > + if (valid)
> > + continue;
> > +
> > + if (!early)
> > + printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %Lx is
> > not" + " reserved in ACPI motherboard
> > resources\n", + cfg->address);
> > + /* Don't try to do this check unless configuration
> > + type 1 is available. how about type 2 ?*/
> > + if (raw_pci_ops && e820_all_mapped(cfg->address,
> > + cfg->address + size - 1,
> > + E820_RESERVED)) {
> > + printk(KERN_NOTICE
> > + "PCI: MCFG area at %Lx reserved in E820\n",
> > + cfg->address);
> > + valid = 1;
> > + }
> > +
> > + if (!valid)
> > + goto reject;
> > }
>
> This loop is a bit messy, is there some way of making it clearer? Maybe the
> early vs. late stuff should be split into separate routines entirely...
for (i = 0; i < pci_mmcfg_config_num; i++) {
int valid = 0;
u32 size = (cfg->end_bus_number + 1) << 20;
cfg = &pci_mmcfg_config[i];
printk(KERN_NOTICE "PCI: MCFG configuration %d: base %lx "
"segment %hu buses %u - %u\n",
i, (unsigned long)cfg->address, cfg->pci_segment,
(unsigned int)cfg->start_bus_number,
(unsigned int)cfg->end_bus_number);
if (!early &&
============================================> early check..
is_acpi_reserved(cfg->address, cfg->address + size - 1)) {
printk(KERN_NOTICE "PCI: MCFG area at %Lx reserved "
"in ACPI motherboard resources\n",
cfg->address);
valid = 1;
}
if (valid)
continue;
if (!early)
=================================================> check early
printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %Lx is not"
" reserved in ACPI motherboard resources\n",
cfg->address);
/* Don't try to do this check unless configuration
type 1 is available. how about type 2 ?*/
if (raw_pci_ops && e820_all_mapped(cfg->address,
cfg->address + size - 1,
E820_RESERVED)) {
printk(KERN_NOTICE
"PCI: MCFG area at %Lx reserved in E820\n",
cfg->address);
valid = 1;
}
if (!valid)
goto reject;
}
return;
only two early check ... , if split that we will get almost same
duplicated lines.
>
>
> > @@ -842,11 +842,14 @@ static void set_pcie_port_type(struct pci_dev *pdev)
> > * reading the dword at 0x100 which must either be 0 or a valid extended
> > * capability header.
> > */
> > -int pci_cfg_space_size(struct pci_dev *dev)
> > +int pci_cfg_space_size_ext(struct pci_dev *dev, unsigned check_exp_pcix)
> > {
> > int pos;
> > u32 status;
> >
> > + if (!check_exp_pcix)
> > + goto skip;
> > +
>
> Rather than adding a flag to pci_cfg_space_size, you could either factor out
> the extended space probe into a separate routine and use it from both
> pci_cfg_space_size and the fixup code, or just make the fixup code do the
> probe & cfg_size setting by hand, moving the PCI_CFG_SPACE_SIZE and
> PCI_CFG_SPACE_EXP_SIZE to pci.h.
by hand, will need to check if mmconf is enabled or not.
will check if can factor out it.
YH
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