drm/radeon: implement ACPI VFCT vbios fetch (v3)

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
V3: fix it harder

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Cc: stable@vger.kernel.org

1 files changed, 60 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_bios.c b/drivers/gpu/drm/radeon/radeon_bios.c
index 501f4881e5aa..a32232fc7bd3 100644
--- a/drivers/gpu/drm/radeon/radeon_bios.c
+++ b/drivers/gpu/drm/radeon/radeon_bios.c
@@ -32,6 +32,7 @@
 
 #include <linux/vga_switcheroo.h>
 #include <linux/slab.h>
+#include <linux/acpi.h>
 /*
  * BIOS.
  */
@@ -476,6 +477,63 @@ static bool radeon_read_disabled_bios(struct radeon_device *rdev)
                 return legacy_read_disabled_bios(rdev);
 }
 
+#ifdef CONFIG_ACPI
+static bool radeon_acpi_vfct_bios(struct radeon_device *rdev)
+{
+        bool ret = false;
+        struct acpi_table_header *hdr;
+        /* acpi_get_table_with_size is not exported :( */
+        acpi_size tbl_size = 0x7fffffff;
+        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... */
+        return ret;
+}
+#else
+static inline bool radeon_acpi_vfct_bios(struct radeon_device *rdev)
+{
+        return false;
+}
+#endif
 
 bool radeon_get_bios(struct radeon_device *rdev)
 {
@@ -484,6 +542,8 @@ 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);