On Thu, Aug 16, 2012 at 03:13:46PM -0400, alexdeucher@xxxxxxxxx wrote: > From: David L <equinox-freedesktopbugs@xxxxxxxxxx> From: David Lamparter <equinox@xxxxxxxxxx> There are still two rough edges left in here, I didn't get around to clean it up, other stuff came up -- sorry... > This is required for pure UEFI systems. The vbios is stored > in ACPI rather than at the legacy vga location. > > Fixes: > https://bugs.freedesktop.org/show_bug.cgi?id=26891 > > V2: fix #ifdefs as per Greg's comments > > Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > --- [...] > + struct acpi_table_header *hdr; > + /* acpi_get_table_with_size is not exported :( */ > + acpi_size tbl_size = 0x7fffffff; I was using acpi_get_table_with_size, but that needs an export, with 0x7fffffff all the tests below are kinda useless because they always succeed. I think it'd be useful to keep the length checks in case some vendor breaks their ACPI tables, so this needs an EXPORT_SYMBOL. > + UEFI_ACPI_VFCT *vfct; > + GOP_VBIOS_CONTENT *vbios; > + VFCT_IMAGE_HEADER *vhdr; > + > + if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr))) > + return false; > + if (tbl_size < sizeof(UEFI_ACPI_VFCT)) { > + DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n"); > + goto out_unmap; > + } > + > + vfct = (UEFI_ACPI_VFCT *)hdr; > + if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) > tbl_size) { > + DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n"); > + goto out_unmap; > + } > + > + vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + vfct->VBIOSImageOffset); > + vhdr = &vbios->VbiosHeader; > + DRM_INFO("ACPI VFCT contains a BIOS for %02x:%02x.%d %04x:%04x, size %d\n", > + vhdr->PCIBus, vhdr->PCIDevice, vhdr->PCIFunction, > + vhdr->VendorID, vhdr->DeviceID, vhdr->ImageLength); > + > + if (vhdr->PCIBus != rdev->pdev->bus->number || > + vhdr->PCIDevice != PCI_SLOT(rdev->pdev->devfn) || > + vhdr->PCIFunction != PCI_FUNC(rdev->pdev->devfn) || > + vhdr->VendorID != rdev->pdev->vendor || > + vhdr->DeviceID != rdev->pdev->device) { > + DRM_INFO("ACPI VFCT table is not for this card\n"); > + goto out_unmap; > + }; > + > + if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) + vhdr->ImageLength > tbl_size) { > + DRM_ERROR("ACPI VFCT image truncated\n"); > + goto out_unmap; > + } > + > + rdev->bios = kmemdup(&vbios->VbiosContent, vhdr->ImageLength, GFP_KERNEL); > + ret = !!rdev->bios; > + > +out_unmap: > + /* uh, no idea what to do here... */ So, er, I had no clue how to clean up the return value of acpi_get_table - does this actually need to be cleaned up? Or do you just get a pointer straight to the "real" ACPI table? > + return ret; > +} > +#else > +static bool radeon_acpi_vfct_bios(struct radeon_device *rdev) > +{ > + return false; > +} > +#endif > > bool radeon_get_bios(struct radeon_device *rdev) > { > @@ -484,6 +544,8 @@ bool radeon_get_bios(struct radeon_device *rdev) > > r = radeon_atrm_get_bios(rdev); > if (r == false) > + r = radeon_acpi_vfct_bios(rdev); > + if (r == false) > r = igp_read_bios_from_vram(rdev); > if (r == false) > r = radeon_read_bios(rdev); > -- > 1.7.7.5 > Cheers, -David
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