On Tue, Jan 16, 2018 at 10:43:17AM +0100, Christian König wrote:
> We need to reprogram the register content during resume.
>
> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
> Reported-by: Tom St Denis <tom.stdenis@xxxxxxx>
Applied to for-linus for v4.15, thanks.
> ---
> arch/x86/pci/fixup.c | 32 ++++++++++++++++++++------------
> 1 file changed, 20 insertions(+), 12 deletions(-)
>
> diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c
> index f6a26e3cb476..8f3b1a6278e6 100644
> --- a/arch/x86/pci/fixup.c
> +++ b/arch/x86/pci/fixup.c
> @@ -662,11 +662,11 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x2033, quirk_no_aersid);
> */
> static void pci_amd_enable_64bit_bar(struct pci_dev *dev)
> {
> + static const char *name = "PCI Bus 0000:00";
> + struct resource *res, *conflict;
> u32 base, limit, high;
> struct pci_dev *other;
> - struct resource *res;
> unsigned i;
> - int r;
>
> if (!(pci_probe & PCI_BIG_ROOT_WINDOW))
> return;
> @@ -707,21 +707,26 @@ static void pci_amd_enable_64bit_bar(struct pci_dev *dev)
> * Allocate a 256GB window directly below the 0xfd00000000 hardware
> * limit (see AMD Family 15h Models 30h-3Fh BKDG, sec 2.4.6).
> */
> - res->name = "PCI Bus 0000:00";
> + res->name = name;
> res->flags = IORESOURCE_PREFETCH | IORESOURCE_MEM |
> IORESOURCE_MEM_64 | IORESOURCE_WINDOW;
> res->start = 0xbd00000000ull;
> res->end = 0xfd00000000ull - 1;
>
> - r = request_resource(&iomem_resource, res);
> - if (r) {
> + conflict = request_resource_conflict(&iomem_resource, res);
> + if (conflict) {
> kfree(res);
> - return;
> - }
> + if (conflict->name != name)
> + return;
>
> - dev_info(&dev->dev, "adding root bus resource %pR (tainting kernel)\n",
> - res);
> - add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
> + /* We are resuming from suspend, just reprogram the regs. */
> + res = conflict;
> + } else {
> + dev_info(&dev->dev, "adding root bus resource %pR (tainting kernel)\n",
> + res);
> + add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
> + pci_bus_add_resource(dev->bus, res, 0);
> + }
>
> base = ((res->start >> 8) & AMD_141b_MMIO_BASE_MMIOBASE_MASK) |
> AMD_141b_MMIO_BASE_RE_MASK | AMD_141b_MMIO_BASE_WE_MASK;
> @@ -733,13 +738,16 @@ static void pci_amd_enable_64bit_bar(struct pci_dev *dev)
> 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_FINAL(PCI_VENDOR_ID_AMD, 0x1401, pci_amd_enable_64bit_bar);
> DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x141b, pci_amd_enable_64bit_bar);
> DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x1571, pci_amd_enable_64bit_bar);
> DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x15b1, pci_amd_enable_64bit_bar);
> DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x1601, pci_amd_enable_64bit_bar);
> +DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x1401, pci_amd_enable_64bit_bar);
> +DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x141b, pci_amd_enable_64bit_bar);
> +DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x1571, pci_amd_enable_64bit_bar);
> +DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x15b1, pci_amd_enable_64bit_bar);
> +DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x1601, pci_amd_enable_64bit_bar);
>
> #endif
> --
> 2.11.0
>
