On Thu, Feb 15, 2007 at 08:02:21AM +, Jan Beulich wrote:
> The change to force legacy mode IDE channels' resources to fixed
> non-zero values confuses (at least some versions of) X, because the
> values reported by the kernel and those readable from PCI config space
> aren't consistent anymore. Therefore, this patch arranges for the
> respective BARs to also get updated if possible.
>
> (The only change to the original version is an added comment.)
>
> Signed-off-by: Jan Beulich <[EMAIL PROTECTED]>
Acked-by: Alan Cox <[EMAIL PROTECTED]>
>
> --- linux-2.6.20/drivers/pci/probe.c 2007-02-04 19:44:54.0 +0100
> +++ 2.6.20-pci-ide-legacy/drivers/pci/probe.c 2007-02-15 08:54:58.0
> +0100
> @@ -639,7 +639,34 @@ static void pci_read_irq(struct pci_dev
> dev->irq = irq;
> }
>
> -#define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
> +static void change_legacy_io_resource(struct pci_dev * dev, unsigned index,
> + unsigned start, unsigned end)
> +{
> + unsigned base = start & PCI_BASE_ADDRESS_IO_MASK;
> + unsigned len = (end | ~PCI_BASE_ADDRESS_IO_MASK) - base + 1;
> +
> + /*
> + * Some X versions get confused when the BARs reported through
> + * /sys or /proc differ from those seen in config space, thus
> + * try to update the config space values, too.
> + */
> + if (!(pci_resource_flags(dev, index) & IORESOURCE_IO))
> + printk(KERN_WARNING "%s: cannot adjust BAR%u (not I/O)\n",
> +pci_name(dev), index);
> + else if (pci_resource_len(dev, index) != len)
> + printk(KERN_WARNING "%s: cannot adjust BAR%u (size %04X)\n",
> +pci_name(dev), index, (unsigned)pci_resource_len(dev,
> index));
> + else {
> + printk(KERN_INFO "%s: trying to change BAR%u from %04X to
> %04X\n",
> +pci_name(dev), index,
> +(unsigned)pci_resource_start(dev, index), base);
> + pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + index * 4,
> base);
> + }
> + pci_resource_start(dev, index) = start;
> + pci_resource_end(dev, index) = end;
> + pci_resource_flags(dev, index) =
> + IORESOURCE_IO | IORESOURCE_PCI_FIXED |
> PCI_BASE_ADDRESS_SPACE_IO;
> +}
>
> /**
> * pci_setup_device - fill in class and map information of a device
> @@ -692,20 +719,12 @@ static int pci_setup_device(struct pci_d
> u8 progif;
> pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
> if ((progif & 1) == 0) {
> - dev->resource[0].start = 0x1F0;
> - dev->resource[0].end = 0x1F7;
> - dev->resource[0].flags = LEGACY_IO_RESOURCE;
> - dev->resource[1].start = 0x3F6;
> - dev->resource[1].end = 0x3F6;
> - dev->resource[1].flags = LEGACY_IO_RESOURCE;
> + change_legacy_io_resource(dev, 0, 0x1F0, 0x1F7);
> + change_legacy_io_resource(dev, 1, 0x3F6, 0x3F6);
> }
> if ((progif & 4) == 0) {
> - dev->resource[2].start = 0x170;
> - dev->resource[2].end = 0x177;
> - dev->resource[2].flags = LEGACY_IO_RESOURCE;
> - dev->resource[3].start = 0x376;
> - dev->resource[3].end = 0x376;
> - dev->resource[3].flags = LEGACY_IO_RESOURCE;
> + change_legacy_io_resource(dev, 2, 0x170, 0x177);
> + change_legacy_io_resource(dev, 3, 0x376, 0x376);
> }
> }
> break;
>
--
--
In Ximian did mad Miguel a mighty mail client decree
Where Nat the crazy hacker ran
Through sourcecode measureless to man
And never coredump free
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