On Thu, May 4, 2017 at 12:31 PM, Christian König
<deathsimple@xxxxxxxxxxx> wrote:
> From: Christian König <christian.koenig@xxxxxxx>
>
> Most BIOS don't enable this because of compatibility reasons.
>
> Manually enable a 64bit BAR of 64GB size so that we have
> enough room for PCI devices.
>
> v2: style cleanups, increase size, add resource name, set correct flags,
> print message that windows was added
> v3: add defines for all the magic numbers, style cleanups
FWIW:
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
>
> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
> ---
> arch/x86/pci/fixup.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 69 insertions(+)
>
> diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c
> index 6d52b94..1c36ed6 100644
> --- a/arch/x86/pci/fixup.c
> +++ b/arch/x86/pci/fixup.c
> @@ -571,3 +571,72 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x2fc0, pci_invalid_bar);
> DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6f60, pci_invalid_bar);
> DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6fa0, pci_invalid_bar);
> DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6fc0, pci_invalid_bar);
> +
> +#define AMD_141b_MMIO_BASE(x) (0x80 + (x) * 0x8)
> +#define AMD_141b_MMIO_BASE_RE_MASK BIT(0)
> +#define AMD_141b_MMIO_BASE_WE_MASK BIT(1)
> +#define AMD_141b_MMIO_BASE_MMIOBASE_MASK GENMASK(31,8)
> +
> +#define AMD_141b_MMIO_LIMIT(x) (0x84 + (x) * 0x8)
> +#define AMD_141b_MMIO_LIMIT_MMIOLIMIT_MASK GENMASK(31,8)
> +
> +#define AMD_141b_MMIO_HIGH(x) (0x180 + (x) * 0x4)
> +#define AMD_141b_MMIO_HIGH_MMIOBASE_MASK GENMASK(7,0)
> +#define AMD_141b_MMIO_HIGH_MMIOLIMIT_SHIFT 16
> +#define AMD_141b_MMIO_HIGH_MMIOLIMIT_MASK GENMASK(23,16)
> +
> +static void pci_amd_enable_64bit_bar(struct pci_dev *dev)
> +{
> + struct resource *res, *conflict;
> + u32 base, limit, high;
> + unsigned i;
> +
> + for (i = 0; i < 8; ++i) {
> + pci_read_config_dword(dev, AMD_141b_MMIO_BASE(i), &base);
> + pci_read_config_dword(dev, AMD_141b_MMIO_HIGH(i), &high);
> +
> + /* Is this slot free? */
> + if (!(base & (AMD_141b_MMIO_BASE_RE_MASK |
> + AMD_141b_MMIO_BASE_WE_MASK)))
> + break;
> +
> + base >>= 8;
> + base |= high << 24;
> +
> + /* Abort if a slot already configures a 64bit BAR. */
> + if (base > 0x10000)
> + return;
> + }
> + if (i == 8)
> + return;
> +
> + res = kzalloc(sizeof(*res), GFP_KERNEL);
> + if (!res)
> + return;
> +
> + res->name = "PCI Bus 0000:00";
> + res->flags = IORESOURCE_PREFETCH | IORESOURCE_MEM |
> + IORESOURCE_MEM_64 | IORESOURCE_WINDOW;
> + res->start = 0x100000000ull;
> + res->end = 0xfd00000000ull - 1;
> +
> + /* Just grab the free area behind system memory for this */
> + while ((conflict = request_resource_conflict(&iomem_resource, res)))
> + res->start = conflict->end + 1;
> +
> + dev_info(&dev->dev, "adding root bus resource %pR\n", res);
> +
> + base = ((res->start >> 8) & AMD_141b_MMIO_BASE_MMIOBASE_MASK) |
> + AMD_141b_MMIO_BASE_RE_MASK | AMD_141b_MMIO_BASE_WE_MASK;
> + limit = ((res->end + 1) >> 8) & AMD_141b_MMIO_LIMIT_MMIOLIMIT_MASK;
> + high = ((res->start >> 40) & AMD_141b_MMIO_HIGH_MMIOBASE_MASK) |
> + ((((res->end + 1) >> 40) << AMD_141b_MMIO_HIGH_MMIOLIMIT_SHIFT)
> + & AMD_141b_MMIO_HIGH_MMIOLIMIT_MASK);
> +
> + pci_write_config_dword(dev, AMD_141b_MMIO_HIGH(i), high);
> + pci_write_config_dword(dev, AMD_141b_MMIO_LIMIT(i), limit);
> + pci_write_config_dword(dev, AMD_141b_MMIO_BASE(i), base);
> +
> + pci_bus_add_resource(dev->bus, res, 0);
> +}
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x141b, pci_amd_enable_64bit_bar);
> --
> 2.7.4
>
--
With Best Regards,
Andy Shevchenko
