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>

2 files changed, 37 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;
diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
index 2191a9e4f3db..396183628f3c 100644
--- a/include/uapi/drm/amdgpu_drm.h
+++ b/include/uapi/drm/amdgpu_drm.h
@@ -522,6 +522,12 @@ struct drm_amdgpu_cs_chunk_data {
 #define AMDGPU_INFO_MEMORY                      0x19
 /* Query vce clock table */
 #define AMDGPU_INFO_VCE_CLOCK_TABLE             0x1A
+/* Query vbios related information */
+#define AMDGPU_INFO_VBIOS                       0x1B
+        /* Subquery id: Query vbios size */
+        #define AMDGPU_INFO_VBIOS_SIZE          0x1
+        /* Subquery id: Query vbios image */
+        #define AMDGPU_INFO_VBIOS_IMAGE         0x2
 
 #define AMDGPU_INFO_MMR_SE_INDEX_SHIFT  0
 #define AMDGPU_INFO_MMR_SE_INDEX_MASK   0xff
@@ -580,6 +586,11 @@ struct drm_amdgpu_info {
                 } read_mmr_reg;
 
                 struct drm_amdgpu_query_fw query_fw;
+
+                struct {
+                        __u32 type;
+                        __u32 offset;
+                } vbios_info;
         };
 };