[PATCH v5 1/4] efi_loader: get version information from device tree
Masahisa Kojima
masahisa.kojima at linaro.org
Tue May 9 11:57:19 CEST 2023
On Mon, 8 May 2023 at 18:44, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
>
> On 5/8/23 10:15, Masahisa Kojima wrote:
> > Hi Heinrich,
> >
> > On Thu, 27 Apr 2023 at 15:09, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
> >>
> >> On 4/10/23 11:07, Masahisa Kojima wrote:
> >>> Current FMP->GetImageInfo() always return 0 for the firmware
> >>> version, user can not identify which firmware version is currently
> >>> running through the EFI interface.
> >>>
> >>> This commit gets the version information from device tree,
> >>> then fills the firmware version, lowest supported version
> >>> in FMP->GetImageInfo().
> >>>
> >>> Now FMP->GetImageInfo() and ESRT have the meaningful version number.
> >>>
> >>> Signed-off-by: Masahisa Kojima <masahisa.kojima at linaro.org>
> >>> ---
> >>> Changes in v5:
> >>> - newly implement a device tree based versioning
> >>>
> >>> .../firmware/firmware-version.txt | 25 ++++++++
> >>> lib/efi_loader/efi_firmware.c | 63 +++++++++++++++++--
> >>> 2 files changed, 84 insertions(+), 4 deletions(-)
> >>> create mode 100644 doc/device-tree-bindings/firmware/firmware-version.txt
> >>>
> >>> diff --git a/doc/device-tree-bindings/firmware/firmware-version.txt b/doc/device-tree-bindings/firmware/firmware-version.txt
> >>> new file mode 100644
> >>> index 0000000000..6112de4a1d
> >>> --- /dev/null
> >>> +++ b/doc/device-tree-bindings/firmware/firmware-version.txt
> >>> @@ -0,0 +1,25 @@
> >>> +firmware-version bindings
> >>> +-------------------------------
> >>> +
> >>> +Required properties:
> >>> +- image-type-id : guid for image blob type
> >>> +- image-index : image index
> >>> +- fw-version : firmware version
> >>> +- lowest-supported-version : lowest supported version
> >>> +
> >>> +Example:
> >>> +
> >>> + firmware-version {
> >>> + image1 {
> >>> + image-type-id = "09D7CF52-0720-4710-91D1-08469B7FE9C8";
> >>> + image-index = <1>;
> >>> + fw-version = <5>;
> >>> + lowest-supported-version = <3>;
> >>> + };
> >>> + image2 {
> >>> + image-type-id = "5A7021F5-FEF2-48B4-AABA-832E777418C0";
> >>> + image-index = <2>;
> >>> + fw-version = <10>;
> >>> + lowest-supported-version = <7>;
> >>> + };
> >>> + };
> >>> diff --git a/lib/efi_loader/efi_firmware.c b/lib/efi_loader/efi_firmware.c
> >>> index 93e2b01c07..1c6ef468bf 100644
> >>> --- a/lib/efi_loader/efi_firmware.c
> >>> +++ b/lib/efi_loader/efi_firmware.c
> >>> @@ -102,6 +102,56 @@ efi_status_t EFIAPI efi_firmware_set_package_info_unsupported(
> >>> return EFI_EXIT(EFI_UNSUPPORTED);
> >>> }
> >>>
> >>> +/**
> >>> + * efi_firmware_get_firmware_version - get firmware version from dtb
> >>> + * @image_index: Image index
> >>> + * @image_type_id: Image type id
> >>> + * @fw_version: Pointer to store the version number
> >>> + * @lsv: Pointer to store the lowest supported version
> >>> + *
> >>> + * Authenticate the capsule if authentication is enabled.
> >>> + * The image pointer and the image size are updated in case of success.
> >>> + */
> >>> +void efi_firmware_get_firmware_version(u8 image_index,
> >>> + efi_guid_t *image_type_id,
> >>> + u32 *fw_version, u32 *lsv)
> >>> +{
> >>> + const void *fdt = gd->fdt_blob;
> >>> + const fdt32_t *val;
> >>> + const char *guid_str;
> >>> + int len, offset, index;
> >>> + int parent;
> >>> +
> >>> + parent = fdt_subnode_offset(fdt, 0, "firmware-version");
> >>> + if (parent < 0)
> >>> + return;
> >>> +
> >>> + fdt_for_each_subnode(offset, fdt, parent) {
> >>> + efi_guid_t guid;
> >>> +
> >>> + guid_str = fdt_getprop(fdt, offset, "image-type-id", &len);
> >>> + if (!guid_str)
> >>> + continue;
> >>> + uuid_str_to_bin(guid_str, guid.b, UUID_STR_FORMAT_GUID);
> >>> +
> >>> + val = fdt_getprop(fdt, offset, "image-index", &len);
> >>> + if (!val)
> >>> + continue;
> >>> + index = fdt32_to_cpu(*val);
> >>> +
> >>> + if (!guidcmp(&guid, image_type_id) && index == image_index) {
> >>> + val = fdt_getprop(fdt, offset, "fw-version", &len);
> >>> + if (val)
> >>> + *fw_version = fdt32_to_cpu(*val);
> >>> +
> >>> + val = fdt_getprop(fdt, offset,
> >>> + "lowest-supported-version", &len);
> >>> + if (val)
> >>> + *lsv = fdt32_to_cpu(*val);
> >>> + }
> >>> + }
> >>> +}
> >>> +
> >>> /**
> >>> * efi_fill_image_desc_array - populate image descriptor array
> >>> * @image_info_size: Size of @image_info
> >>> @@ -148,13 +198,19 @@ static efi_status_t efi_fill_image_desc_array(
> >>> *package_version_name = NULL; /* not supported */
> >>>
> >>> for (i = 0; i < num_image_type_guids; i++) {
> >>
> >> Currently we define num_image_type_guids per board in a C file. Using
> >> the same line of code once per board makes no sense to me. Please, move
> >> the definition of that variable to lib/efi_loader/efi_firmware.c.
> >
> > Sorry for the late reply.
> >
> > num_image_type_guids is calculated with "ARRAY_SIZE(fw_images)",
> > fw_images[] array is also defined in each board file,
> > so we can not simply move num_image_type_guids into
> > lib/efi_loader/efi_firmware.c.
>
> Why can't we have
>
> int num_image_type_guids = ARRAY_SIZE(fw_images);
>
> in lib/efi_loader/efi_firmware.c?
At first thought, I thought it was a matter of abstraction.
But there is a compilation error when we expose fw_images[].
fw_images[] array is initialized in each board file,
and sizeof() of the external fw_images[] array in lib/efi_loader/efi_firmware.c
will cause compilation failure.
We need to specify the array size when fw_images is exposed,
for example:
extern struct efi_fw_image fw_images[2];
but currently there is no method to pre-define the fw_images[] array size,
it is board specific.
We can define the macro to indicate the array size or having
sentinel in the fw_images[] array, but I think the current
implementation is simpler,
I would like to keep the current implementation.
Correct me if I'm wrong.
Thanks,
Masahisa Kojima
>
> Best regards
>
> Heinrich
>
> >
> > And fw_images[] array is abstracted by struct efi_capsule_update_info,
> > so I think
> > we should not extract the fw_images[] array.
> >
> >>
> >>> + u32 fw_version = 0;
> >>> + u32 lowest_supported_version = 0;
> >>
> >> These assignments should be in efi_firmware_get_firmware_version.
> >
> > OK.
> >
> >>
> >>> +
> >>> image_info[i].image_index = fw_array[i].image_index;
> >>
> >> Why did we ever introduce the field image_index? Please, eliminate it it
> >> as the GUID is always sufficient to identify an image.
> >
> > This is derived from the UEFI specification.
> > UEFI specification "23.1.2
> > EFI_FIRMWARE_MANAGEMENT_PROTOCOL.GetImageInfo()" requires ImageIndex
> > and ImageTypeId(guid).
> >
> > ImageIndex: A unique number identifying the firmware image within the
> > device. The number is between 1 and
> > DescriptorCount.
> >
> >>
> >>> image_info[i].image_type_id = fw_array[i].image_type_id;
> >>> image_info[i].image_id = fw_array[i].image_index;
> >>>
> >>> image_info[i].image_id_name = fw_array[i].fw_name;
> >>> -
> >>> - image_info[i].version = 0; /* not supported */
> >>> + efi_firmware_get_firmware_version(fw_array[i].image_index,
> >>> + &fw_array[i].image_type_id,
> >>> + &fw_version,
> >>> + &lowest_supported_version);
> >>
> >> This interface makes no sense to me. We expect images with specific
> >> GUIDs and should not care about images with other GUIDs that may
> >> additionally exist in the capsule.
> >>
> >> So you must pass the expected GUID as input variable here.
> >
> > I don't clearly understand this comment, but the expected GUID is
> > fw_array[i].image_type_id.
> >
> >>
> >>> + image_info[i].version = fw_version;
> >>> image_info[i].version_name = NULL; /* not supported */
> >>
> >> Please, add the missing functionality to
> >> efi_firmware_get_firmware_version().
> >
> > Does it mean we need to support version_name?
> > I can add a version_name in dtb.
> >
> >>
> >> Please, pass *image_info[i] to efi_firmware_get_firmware_version. That
> >> will simplify the code.
> >
> > OK.
> >
> > Thank you for your review.
> >
> > Regards,
> > Masahisa Kojima
> >
> >>
> >> Best regards
> >>
> >> Heinrich
> >>
> >>> image_info[i].size = 0;
> >>> image_info[i].attributes_supported =
> >>> @@ -168,7 +224,7 @@ static efi_status_t efi_fill_image_desc_array(
> >>> image_info[0].attributes_setting |=
> >>> IMAGE_ATTRIBUTE_AUTHENTICATION_REQUIRED;
> >>>
> >>> - image_info[i].lowest_supported_image_version = 0;
> >>> + image_info[i].lowest_supported_image_version = lowest_supported_version;
> >>> image_info[i].last_attempt_version = 0;
> >>> image_info[i].last_attempt_status = LAST_ATTEMPT_STATUS_SUCCESS;
> >>> image_info[i].hardware_instance = 1;
> >>> @@ -290,7 +346,6 @@ efi_status_t EFIAPI efi_firmware_get_image_info(
> >>> descriptor_version, descriptor_count,
> >>> descriptor_size, package_version,
> >>> package_version_name);
> >>> -
> >>> return EFI_EXIT(ret);
> >>> }
> >>>
> >>
>
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