drm/amd/amdgpu: export vbios information (v2)

Allows userspace components to fetch information
from the vbios image.

v2: agd: fix warning

Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian Koenig <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index d1cf9ac0dff1..9af87eaf8ee3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -544,6 +544,32 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
                 return copy_to_user(out, &vce_clk_table,
                                     min((size_t)size, sizeof(vce_clk_table))) ? -EFAULT : 0;
         }
+        case AMDGPU_INFO_VBIOS: {
+                uint32_t bios_size = adev->bios_size;
+
+                switch (info->vbios_info.type) {
+                case AMDGPU_INFO_VBIOS_SIZE:
+                        return copy_to_user(out, &bios_size,
+                                        min((size_t)size, sizeof(bios_size)))
+                                        ? -EFAULT : 0;
+                case AMDGPU_INFO_VBIOS_IMAGE: {
+                        uint8_t *bios;
+                        uint32_t bios_offset = info->vbios_info.offset;
+
+                        if (bios_offset >= bios_size)
+                                return -EINVAL;
+
+                        bios = adev->bios + bios_offset;
+                        return copy_to_user(out, bios,
+                                            min((size_t)size, (size_t)(bios_size - bios_offset)))
+                                        ? -EFAULT : 0;
+                }
+                default:
+                        DRM_DEBUG_KMS("Invalid request %d\n",
+                                        info->vbios_info.type);
+                        return -EINVAL;
+                }
+        }
         default:
                 DRM_DEBUG_KMS("Invalid request %d\n", info->query);
                 return -EINVAL;