[RFC PATCH 03/10] FWU: Add metadata structure and functions for accessing metadata
Sughosh Ganu
sughosh.ganu at linaro.org
Thu Dec 9 10:42:36 CET 2021
On Wed, 8 Dec 2021 at 19:23, Etienne Carriere <etienne.carriere at linaro.org>
wrote:
> Hi Sughosh,
>
>
> On Thu, 25 Nov 2021 at 08:03, Sughosh Ganu <sughosh.ganu at linaro.org>
> wrote:
> >
> > In the FWU Multi Bank Update feature, the information about the
> > updatable images is stored as part of the metadata, which is stored on
> > a dedicated partition. Add the metadata structure, and functions to
> > access the metadata. These are generic API's, and implementations can
> > be added based on parameters like how the metadata partition is
> > accessed and what type of storage device houses the metadata.
> >
> > Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>
> > ---
> > include/fwu_metadata.h | 125 +++++++++++++++
> > lib/fwu_updates/fwu_metadata.c | 275 +++++++++++++++++++++++++++++++++
> > 2 files changed, 400 insertions(+)
> > create mode 100644 include/fwu_metadata.h
> > create mode 100644 lib/fwu_updates/fwu_metadata.c
> >
> > diff --git a/include/fwu_metadata.h b/include/fwu_metadata.h
> > new file mode 100644
> > index 0000000000..e692ef7506
> > --- /dev/null
> > +++ b/include/fwu_metadata.h
> > @@ -0,0 +1,125 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright (c) 2021, Linaro Limited
> > + */
> > +
> > +#if !defined _FWU_METADATA_H_
>
> nitpicking: prefer #ifndef ?
>
Actually I prefer !defined :). Will keep it as is if you don't have a
strong opinion on this.
> > +#define _FWU_METADATA_H_
> > +
> > +#include <blk.h>
> > +#include <efi.h>
> > +#include <uuid.h>
> > +
> > +#include <linux/types.h>
> > +
> > +/**
> > + * struct fwu_image_bank_info - firmware image information
> > + * @image_uuid: Guid value of the image in this bank
> > + * @accepted: Acceptance status of the image
> > + * @reserved: Reserved
> > + *
> > + * The structure contains image specific fields which are
> > + * used to identify the image and to specify the image's
> > + * acceptance status
> > + */
> > +struct fwu_image_bank_info {
> > + efi_guid_t image_uuid;
> > + u32 accepted;
> > + u32 reserved;
> > +};
> > +
> > +/**
> > + * struct fwu_image_entry - information for a particular type of image
> > + * @image_type_uuid: Guid value for identifying the image type
> > + * @location_uuid: Guid of the storage volume where the image is located
> > + * @img_bank_info: Array containing properties of images
> > + *
> > + * This structure contains information on various types of updatable
> > + * firmware images. Each image type then contains an array of image
> > + * information per bank.
> > + */
> > +struct fwu_image_entry {
> > + efi_guid_t image_type_uuid;
> > + efi_guid_t location_uuid;
> > + struct fwu_image_bank_info img_bank_info[CONFIG_FWU_NUM_BANKS];
> > +};
> > +
> > +/**
> > + * struct fwu_metadata - Metadata structure for multi-bank updates
> > + * @crc32: crc32 value for the metadata
> > + * @version: Metadata version
> > + * @active_index: Index of the bank currently used for booting images
> > + * @previous_active_inde: Index of the bank used before the current bank
> > + * being used for booting
> > + * @img_entry: Array of information on various firmware images that can
> > + * be updated
> > + *
> > + * This structure is used to store all the needed information for
> performing
> > + * multi bank updates on the platform. This contains info on the bank
> being
> > + * used to boot along with the information needed for identification of
> > + * individual images
> > + */
> > +struct fwu_metadata {
> > + u32 crc32;
> > + u32 version;
> > + u32 active_index;
> > + u32 previous_active_index;
> > +
> > + struct fwu_image_entry img_entry[CONFIG_FWU_NUM_IMAGES_PER_BANK];
> > +};
> > +
> > +/**
> > + * @get_active_index: get the current active_index value
> > + * @update_active_index: update the active_index value
> > + * @fill_partition_guid_array: fill the array with guid values of the
> > + * partitions found on the storage media
> > + * @get_image_alt_num: get the alt number to be used for the image
> > + * @metadata_check: check the validity of the metadata partitions
> > + * @revert_boot_index: set the active_index to previous_active_index
> > + * @set_accept_image: set the accepted bit for the image
> > + * @clear_accept_image: clear the accepted bit for the image
> > + * @get_metadata() - Get a metadata copy
> > + */
> > +struct fwu_metadata_ops {
> > + int (*get_active_index)(u32 *active_idx);
> > +
> > + int (*update_active_index)(u32 active_idx);
> > +
> > + int (*fill_partition_guid_array)(efi_guid_t **part_guid_arr,
> > + u32 *nparts);
> > +
> > + int (*get_image_alt_num)(efi_guid_t image_type_id, u32
> update_bank,
> > + int *alt_num);
> > +
> > + int (*metadata_check)(void);
> > +
> > + int (*revert_boot_index)(u32 *active_idx);
>
> revert_active_index seems a better name (imho)
>
Okay.
>
> Is active_idx really needed as an output argument?
> One requiring this value could fetch it calling get_active_index ops
> afterward.
>
You are right. Will change.
>
> > +
> > + int (*set_accept_image)(efi_guid_t *img_type_id);
> > +
> > + int (*clear_accept_image)(efi_guid_t *img_type_id, u32 bank);
> > +
> > + int (*get_metadata)(struct fwu_metadata **metadata);
> > +};
> > +
> > +#define FWU_METADATA_GUID \
> > + EFI_GUID(0x8a7a84a0, 0x8387, 0x40f6, 0xab, 0x41, \
> > + 0xa8, 0xb9, 0xa5, 0xa6, 0x0d, 0x23)
> > +
> > +#define FWU_METADATA_VERSION 0x1
> > +
> > +extern struct fwu_metadata_ops fwu_gpt_blk_ops;
> > +
> > +struct fwu_metadata_ops *get_plat_fwu_metadata_ops(void);
> > +int fwu_get_active_index(u32 *active_idx);
> > +int fwu_update_active_index(u32 active_idx);
> > +int fwu_fill_partition_guid_array(efi_guid_t **part_guid_arr, u32
> *nparts);
> > +int fwu_get_image_alt_num(efi_guid_t image_type_id, u32 update_bank,
> > + int *alt_num);
> > +int fwu_metadata_check(void);
> > +int fwu_revert_boot_index(u32 *active_idx);
> > +int fwu_accept_image(efi_guid_t *img_type_id);
> > +int fwu_clear_accept_image(efi_guid_t *img_type_id, u32 bank);
> > +int fwu_get_metadata(struct fwu_metadata **metadata);
> > +
> > +#endif /* _FWU_METADATA_H_ */
> > diff --git a/lib/fwu_updates/fwu_metadata.c
> b/lib/fwu_updates/fwu_metadata.c
> > new file mode 100644
> > index 0000000000..ebc3eaa04a
> > --- /dev/null
> > +++ b/lib/fwu_updates/fwu_metadata.c
> > @@ -0,0 +1,275 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (c) 2021, Linaro Limited
> > + */
> > +
> > +#include <fwu_metadata.h>
> > +
> > +#include <linux/errno.h>
> > +#include <linux/types.h>
> > +
> > +static inline struct fwu_metadata_ops *get_fwu_metadata_ops(void)
>
> static inline in a C-source file?
>
> > +{
> > + return get_plat_fwu_metadata_ops();
>
> Can't we use fwu_gpt_blk_ops reference straight in the below functions?
>
This would be needed to have the flexibility to add metadata access
functions for some other types of devices, maybe ones which do not use GPT
based partition scheme.
-sughosh
>
>
> Regards,
> Etienne
>
> > +}
> > +
> > +/**
> > + * fwu_get_active_index() - Get active_index from the metadata
> > + * @active_idx: active_index value to be read
> > + *
> > + * Read the active_index field from the metadata and place it in
> > + * the variable pointed to be the function argument.
> > + *
> > + * Return: 0 if OK, -ve on error
> > + *
> > + */
> > +int fwu_get_active_index(u32 *active_idx)
> > +{
> > + struct fwu_metadata_ops *ops;
> > +
> > + ops = get_fwu_metadata_ops();
> > + if (!ops) {
> > + log_err("Unable to get fwu ops\n");
> > + return -EPROTONOSUPPORT;
> > + }
> > +
> > + if (!ops->get_active_index) {
> > + log_err("get_active_index() method not defined for the
> platform\n");
> > + return -ENOSYS;
> > + }
> > +
> > + return ops->get_active_index(active_idx);
> > +}
> > +
> > +/**
> > + * fwu_update_active_index() - Update active_index from the metadata
> > + * @active_idx: active_index value to be updated
> > + *
> > + * Update the active_index field in the metadata
> > + *
> > + * Return: 0 if OK, -ve on error
> > + *
> > + */
> > +int fwu_update_active_index(u32 active_idx)
> > +{
> > + struct fwu_metadata_ops *ops;
> > +
> > + ops = get_fwu_metadata_ops();
> > + if (!ops) {
> > + log_err("Unable to get fwu ops\n");
> > + return -EPROTONOSUPPORT;
> > + }
> > +
> > + if (!ops->update_active_index) {
> > + log_err("update_active_index() method not defined for
> the platform\n");
> > + return -ENOSYS;
> > + }
> > +
> > + return ops->update_active_index(active_idx);
> > +}
> > +
> > +/**
> > + * fwu_fill_partition_guid_array() - Fill the part_guid_arr array with
> the guid's of
> > + * the partitions
> > + * @part_guid_arr: array of partition guid's
> > + * @nparts: Number of gpt partitions on the device
> > + *
> > + * Get the information on the partition guid's, filling the array with
> the guid
> > + * values and also the number of partitions.
> > + *
> > + * Return: 0 if OK, -ve on error
> > + *
> > + */
> > +int fwu_fill_partition_guid_array(efi_guid_t **part_guid_arr, u32
> *nparts)
> > +{
> > + struct fwu_metadata_ops *ops;
> > +
> > + ops = get_fwu_metadata_ops();
> > + if (!ops) {
> > + log_err("Unable to get fwu ops\n");
> > + return -EPROTONOSUPPORT;
> > + }
> > +
> > + if (!ops->fill_partition_guid_array) {
> > + log_err("fill_partition_guid_array() method not defined
> for the platform\n");
> > + return -ENOSYS;
> > + }
> > +
> > + return ops->fill_partition_guid_array(part_guid_arr, nparts);
> > +}
> > +
> > +/**
> > + * fwu_get_image_alt_num() - Get the dfu alt number to be used for
> capsule update
> > + * @image_type_id: image guid as passed in the capsule
> > + * @update_bank: Bank to which the update is to be made
> > + * @alt_num: The alt_num for the image
> > + *
> > + * Based on the guid value passed in the capsule, along with the bank
> to which the
> > + * image needs to be updated, get the dfu alt number which will be used
> for the
> > + * capsule update
> > + *
> > + * Return: 0 if OK, -ve on error
> > + *
> > + */
> > +int fwu_get_image_alt_num(efi_guid_t image_type_id, u32 update_bank,
> > + int *alt_num)
> > +{
> > + struct fwu_metadata_ops *ops;
> > +
> > + ops = get_fwu_metadata_ops();
> > + if (!ops) {
> > + log_err("Unable to get fwu ops\n");
> > + return -EPROTONOSUPPORT;
> > + }
> > +
> > + if (!ops->get_image_alt_num) {
> > + log_err("get_image_alt_num() method not defined for the
> platform\n");
> > + return -ENOSYS;
> > + }
> > +
> > + return ops->get_image_alt_num(image_type_id, update_bank,
> alt_num);
> > +}
> > +
> > +/**
> > + * fwu_metadata_check() - Check if the metadata is valid
> > + *
> > + * Validate both copies of metadata. If one of the copies
> > + * has gone bad, restore it from the other bad copy.
> > + *
> > + * Return: 0 if OK, -ve on error
> > + *
> > + */
> > +int fwu_metadata_check(void)
> > +{
> > + struct fwu_metadata_ops *ops;
> > +
> > + ops = get_fwu_metadata_ops();
> > + if (!ops) {
> > + log_err("Unable to get fwu ops\n");
> > + return -EPROTONOSUPPORT;
> > + }
> > +
> > + if (!ops->metadata_check) {
> > + log_err("metadata_check() method not defined for the
> platform\n");
> > + return -ENOSYS;
> > + }
> > +
> > + return ops->metadata_check();
> > +}
> > +
> > +/**
> > + * fwu_revert_boot_index() - Revert the active index in the metadata
> > + * @active_idx: Value of the updated active_index
> > + *
> > + * Revert the active_index value in the metadata, by swapping the values
> > + * of active_index and previous_active_index in both copies of the
> > + * metadata.
> > + *
> > + * Return: 0 if OK, -ve on error
> > + *
> > + */
> > +int fwu_revert_boot_index(u32 *active_idx)
> > +{
> > + struct fwu_metadata_ops *ops;
> > +
> > + ops = get_fwu_metadata_ops();
> > + if (!ops) {
> > + log_err("Unable to get fwu ops\n");
> > + return -EPROTONOSUPPORT;
> > + }
> > +
> > + if (!ops->revert_boot_index) {
> > + log_err("revert_boot_index() method not defined for the
> platform\n");
> > + return -ENOSYS;
> > + }
> > +
> > + return ops->revert_boot_index(active_idx);
> > +}
> > +
> > +/**
> > + * fwu_accept_image() - Set the Acceptance bit for the image
> > + * @img_type_id: Guid of the image type for which the accepted bit is
> to be
> > + * cleared
> > + *
> > + * Set the accepted bit for the image specified by the img_guid
> parameter. This
> > + * indicates acceptance of image for subsequent boots by some governing
> component
> > + * like OS(or firmware).
> > + *
> > + * Return: 0 if OK, -ve on error
> > + *
> > + */
> > +int fwu_accept_image(efi_guid_t *img_type_id)
> > +{
> > + struct fwu_metadata_ops *ops;
> > +
> > + ops = get_fwu_metadata_ops();
> > + if (!ops) {
> > + log_err("Unable to get fwu ops\n");
> > + return -EPROTONOSUPPORT;
> > + }
> > +
> > + if (!ops->set_accept_image) {
> > + log_err("set_accept_image() method not defined for the
> platform\n");
> > + return -ENOSYS;
> > + }
> > +
> > + return ops->set_accept_image(img_type_id);
> > +}
> > +
> > +/**
> > + * fwu_clear_accept_image() - Clear the Acceptance bit for the image
> > + * @img_type_id: Guid of the image type for which the accepted bit is
> to be
> > + * cleared
> > + *
> > + * Clear the accepted bit for the image type specified by the
> img_type_id parameter.
> > + * This function is called after the image has been updated. The
> accepted bit is
> > + * cleared to be set subsequently after passing the image acceptance
> criteria, by
> > + * either the OS(or firmware)
> > + *
> > + * Return: 0 if OK, -ve on error
> > + *
> > + */
> > +int fwu_clear_accept_image(efi_guid_t *img_type_id, u32 bank)
> > +{
> > + struct fwu_metadata_ops *ops;
> > +
> > + ops = get_fwu_metadata_ops();
> > + if (!ops) {
> > + log_err("Unable to get fwu ops\n");
> > + return -EPROTONOSUPPORT;
> > + }
> > +
> > + if (!ops->clear_accept_image) {
> > + log_err("clear_accept_image() method not defined for the
> platform\n");
> > + return -ENOSYS;
> > + }
> > +
> > + return ops->clear_accept_image(img_type_id, bank);
> > +}
> > +
> > +/**
> > + * fwu_get_metadata() - Get a metadata copy
> > + * @metadata: Copy of the metadata
> > + *
> > + * Get a valid copy of the metadata.
> > + *
> > + * Return: 0 if OK, -ve on error
> > + *
> > + */
> > +int fwu_get_metadata(struct fwu_metadata **metadata)
> > +{
> > + struct fwu_metadata_ops *ops;
> > +
> > + ops = get_fwu_metadata_ops();
> > + if (!ops) {
> > + log_err("Unable to get fwu ops\n");
> > + return -EPROTONOSUPPORT;
> > + }
> > +
> > + if (!ops->get_metadata) {
> > + log_err("get_metadata() method not defined for the
> platform\n");
> > + return -ENOSYS;
> > + }
> > +
> > + return ops->get_metadata(metadata);
> > +}
> > --
> > 2.17.1
> >
>
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