[PATCH v4 01/11] FWU: Add FWU metadata structure and driver for accessing metadata
Sughosh Ganu
sughosh.ganu at linaro.org
Tue Feb 8 12:54:21 CET 2022
On Tue, 8 Feb 2022 at 17:15, Michal Simek <michal.simek at xilinx.com> wrote:
>
>
>
> On 2/8/22 12:38, Sughosh Ganu wrote:
> > On Tue, 8 Feb 2022 at 17:01, Michal Simek <monstr at monstr.eu> wrote:
> >>
> >> po 7. 2. 2022 v 19:21 odesílatel Sughosh Ganu <sughosh.ganu at linaro.org> napsal:
> >>>
> >>> 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 a driver model
> >>> uclass which provides 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.
> >>>
> >>> A device tree node fwu-mdata has been added, which is used for
> >>> pointing to the storage device which contains the FWU metadata. The
> >>> fwu-mdata node is u-boot specific, and can be added the platform's
> >>> u-boot dtsi file.
> >>>
> >>> Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>
> >>> ---
> >>>
> >>> Changes since V3:
> >>> * Move the FWU metadata access to driver model
> >>> * Get the storage device containing the metadata from a device tree
> >>> property instead of a platform helper function
> >>>
> >>> arch/arm/dts/stm32mp157c-dk2-u-boot.dtsi | 7 +
> >>> .../firmware/fwu-mdata.txt | 18 +
> >>> drivers/Kconfig | 2 +
> >>> drivers/Makefile | 1 +
> >>> drivers/fwu-mdata/Kconfig | 7 +
> >>> drivers/fwu-mdata/Makefile | 6 +
> >>> drivers/fwu-mdata/fwu-mdata-uclass.c | 434 ++++++++++++++++++
> >>> include/dm/uclass-id.h | 1 +
> >>> include/fwu.h | 51 ++
> >>> include/fwu_mdata.h | 67 +++
> >>> 10 files changed, 594 insertions(+)
> >>> create mode 100644 doc/device-tree-bindings/firmware/fwu-mdata.txt
> >>> create mode 100644 drivers/fwu-mdata/Kconfig
> >>> create mode 100644 drivers/fwu-mdata/Makefile
> >>> create mode 100644 drivers/fwu-mdata/fwu-mdata-uclass.c
> >>> create mode 100644 include/fwu.h
> >>> create mode 100644 include/fwu_mdata.h
> >>>
> >>> diff --git a/arch/arm/dts/stm32mp157c-dk2-u-boot.dtsi b/arch/arm/dts/stm32mp157c-dk2-u-boot.dtsi
> >>> index 06ef3a4095..3bec6107f7 100644
> >>> --- a/arch/arm/dts/stm32mp157c-dk2-u-boot.dtsi
> >>> +++ b/arch/arm/dts/stm32mp157c-dk2-u-boot.dtsi
> >>> @@ -4,3 +4,10 @@
> >>> */
> >>>
> >>> #include "stm32mp157a-dk1-u-boot.dtsi"
> >>> +
> >>> +/ {
> >>> + fwu-mdata {
> >>> + compatible = "u-boot,fwu-mdata";
> >>> + fwu-mdata-store = <&sdmmc1>;
> >>> + };
> >>> +};
> >>> diff --git a/doc/device-tree-bindings/firmware/fwu-mdata.txt b/doc/device-tree-bindings/firmware/fwu-mdata.txt
> >>> new file mode 100644
> >>> index 0000000000..c766b595ef
> >>> --- /dev/null
> >>> +++ b/doc/device-tree-bindings/firmware/fwu-mdata.txt
> >>> @@ -0,0 +1,18 @@
> >>> +FWU Metadata Access Devicetree Binding
> >>> +
> >>> +The FWU Multi Bank Update feature uses a metadata structure, stored on
> >>> +a separate partition for keeping information on the set of updatable
> >>> +images. The device tree node provides information on the storage
> >>> +device that contains the FWU metadata.
> >>> +
> >>> +Required properties :
> >>> +
> >>> +- compatible : "u-boot,fwu-mdata";
> >>> +- fwu-mdata-store : should point to the storage device which contains
> >>> + the FWU metadata partition.
> >>> +
> >>> +Example :
> >>> + fwu-mdata {
> >>> + compatible = "u-boot,fwu-mdata";
> >>> + fwu-mdata-store = <&sdmmc1>;
> >>> + };
> >>> diff --git a/drivers/Kconfig b/drivers/Kconfig
> >>> index b26ca8cf70..adc6079ecf 100644
> >>> --- a/drivers/Kconfig
> >>> +++ b/drivers/Kconfig
> >>> @@ -42,6 +42,8 @@ source "drivers/firmware/Kconfig"
> >>>
> >>> source "drivers/fpga/Kconfig"
> >>>
> >>> +source "drivers/fwu-mdata/Kconfig"
> >>> +
> >>> source "drivers/gpio/Kconfig"
> >>>
> >>> source "drivers/hwspinlock/Kconfig"
> >>> diff --git a/drivers/Makefile b/drivers/Makefile
> >>> index 4e7cf28440..56f0f04874 100644
> >>> --- a/drivers/Makefile
> >>> +++ b/drivers/Makefile
> >>> @@ -81,6 +81,7 @@ obj-y += cache/
> >>> obj-$(CONFIG_CPU) += cpu/
> >>> obj-y += crypto/
> >>> obj-$(CONFIG_FASTBOOT) += fastboot/
> >>> +obj-$(CONFIG_DM_FWU_MDATA) += fwu-mdata/
> >>> obj-y += misc/
> >>> obj-$(CONFIG_MMC) += mmc/
> >>> obj-$(CONFIG_NVME) += nvme/
> >>> diff --git a/drivers/fwu-mdata/Kconfig b/drivers/fwu-mdata/Kconfig
> >>> new file mode 100644
> >>> index 0000000000..d6a21c8e19
> >>> --- /dev/null
> >>> +++ b/drivers/fwu-mdata/Kconfig
> >>> @@ -0,0 +1,7 @@
> >>> +config DM_FWU_MDATA
> >>> + bool "Driver support for accessing FWU Metadata"
> >>> + depends on DM
> >>> + help
> >>> + Enable support for accessing FWU Metadata partitions. The
> >>> + FWU Metadata partitions reside on the same storage device
> >>> + which contains the other FWU updatable firmware images.
> >>> diff --git a/drivers/fwu-mdata/Makefile b/drivers/fwu-mdata/Makefile
> >>> new file mode 100644
> >>> index 0000000000..7fec7171f4
> >>> --- /dev/null
> >>> +++ b/drivers/fwu-mdata/Makefile
> >>> @@ -0,0 +1,6 @@
> >>> +# SPDX-License-Identifier: GPL-2.0+
> >>> +#
> >>> +# Copyright (c) 2022, Linaro Limited
> >>> +#
> >>> +
> >>> +obj-$(CONFIG_DM_FWU_MDATA) += fwu-mdata-uclass.o
> >>> diff --git a/drivers/fwu-mdata/fwu-mdata-uclass.c b/drivers/fwu-mdata/fwu-mdata-uclass.c
> >>> new file mode 100644
> >>> index 0000000000..64b3051ecf
> >>> --- /dev/null
> >>> +++ b/drivers/fwu-mdata/fwu-mdata-uclass.c
> >>> @@ -0,0 +1,434 @@
> >>> +// SPDX-License-Identifier: GPL-2.0+
> >>> +/*
> >>> + * Copyright (c) 2022, Linaro Limited
> >>> + */
> >>> +
> >>> +#include <common.h>
> >>> +#include <dm.h>
> >>> +#include <efi_loader.h>
> >>> +#include <fwu.h>
> >>> +#include <fwu_mdata.h>
> >>> +#include <log.h>
> >>> +#include <malloc.h>
> >>> +
> >>> +#include <linux/errno.h>
> >>> +#include <linux/types.h>
> >>> +#include <u-boot/crc.h>
> >>> +
> >>> +#define IMAGE_ACCEPT_SET BIT(0)
> >>> +#define IMAGE_ACCEPT_CLEAR BIT(1)
> >>> +
> >>> +static int fwu_get_dev_ops(struct udevice **dev,
> >>> + const struct fwu_mdata_ops **ops)
> >>> +{
> >>> + int ret;
> >>> +
> >>> + ret = uclass_get_device(UCLASS_FWU_MDATA, 0, dev);
> >>> + if (ret) {
> >>> + log_debug("Cannot find fwu device\n");
> >>> + return ret;
> >>> + }
> >>> +
> >>> + if ((*ops = device_get_ops(*dev)) == NULL) {
> >>> + log_debug("Cannot get fwu device ops\n");
> >>> + return -ENOSYS;
> >>> + }
> >>> +
> >>> + return 0;
> >>> +}
> >>> +
> >>> +/**
> >>> + * fwu_verify_mdata() - Verify the FWU metadata
> >>> + * @mdata: FWU metadata structure
> >>> + * @pri_part: FWU metadata partition is primary or secondary
> >>> + *
> >>> + * Verify the FWU metadata by computing the CRC32 for the metadata
> >>> + * structure and comparing it against the CRC32 value stored as part
> >>> + * of the structure.
> >>> + *
> >>> + * Return: 0 if OK, -ve on error
> >>> + *
> >>> + */
> >>> +int fwu_verify_mdata(struct fwu_mdata *mdata, bool pri_part)
> >>> +{
> >>> + u32 calc_crc32;
> >>> + void *buf;
> >>> +
> >>> + buf = &mdata->version;
> >>> + calc_crc32 = crc32(0, buf, sizeof(*mdata) - sizeof(u32));
> >>> +
> >>> + if (calc_crc32 != mdata->crc32) {
> >>> + log_err("crc32 check failed for %s FWU metadata partition\n",
> >>> + pri_part ? "primary" : "secondary");
> >>> + return -1;
> >>> + }
> >>> +
> >>> + return 0;
> >>> +}
> >>> +
> >>> +/**
> >>> + * fwu_get_active_index() - Get active_index from the FWU metadata
> >>> + * @active_idx: active_index value to be read
> >>> + *
> >>> + * Read the active_index field from the FWU 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)
> >>> +{
> >>> + int ret;
> >>> + struct fwu_mdata *mdata = NULL;
> >>> +
> >>> + ret = fwu_get_mdata(&mdata);
> >>> + if (ret < 0) {
> >>> + log_err("Unable to get valid FWU metadata\n");
> >>> + goto out;
> >>> + }
> >>> +
> >>> + /*
> >>> + * Found the FWU metadata partition, now read the active_index
> >>> + * value
> >>> + */
> >>> + *active_idx = mdata->active_index;
> >>> + if (*active_idx > CONFIG_FWU_NUM_BANKS - 1) {
> >>> + log_err("Active index value read is incorrect\n");
> >>> + ret = -EINVAL;
> >>> + }
> >>> +
> >>> +out:
> >>> + free(mdata);
> >>> +
> >>> + return ret;
> >>> +}
> >>> +
> >>> +/**
> >>> + * fwu_update_active_index() - Update active_index from the FWU metadata
> >>> + * @active_idx: active_index value to be updated
> >>> + *
> >>> + * Update the active_index field in the FWU metadata
> >>> + *
> >>> + * Return: 0 if OK, -ve on error
> >>> + *
> >>> + */
> >>> +int fwu_update_active_index(u32 active_idx)
> >>> +{
> >>> + int ret;
> >>> + void *buf;
> >>> + struct fwu_mdata *mdata = NULL;
> >>> +
> >>> + if (active_idx > CONFIG_FWU_NUM_BANKS - 1) {
> >>> + log_err("Active index value to be updated is incorrect\n");
> >>> + return -1;
> >>> + }
> >>> +
> >>> + ret = fwu_get_mdata(&mdata);
> >>> + if (ret < 0) {
> >>> + log_err("Unable to get valid FWU metadata\n");
> >>> + goto out;
> >>> + }
> >>> +
> >>> + /*
> >>> + * Update the active index and previous_active_index fields
> >>> + * in the FWU metadata
> >>> + */
> >>> + mdata->previous_active_index = mdata->active_index;
> >>> + mdata->active_index = active_idx;
> >>> +
> >>> + /*
> >>> + * Calculate the crc32 for the updated FWU metadata
> >>> + * and put the updated value in the FWU metadata crc32
> >>> + * field
> >>> + */
> >>> + buf = &mdata->version;
> >>> + mdata->crc32 = crc32(0, buf, sizeof(*mdata) - sizeof(u32));
> >>> +
> >>> + /*
> >>> + * Now write this updated FWU metadata to both the
> >>> + * FWU metadata partitions
> >>> + */
> >>> + ret = fwu_update_mdata(mdata);
> >>> + if (ret < 0) {
> >>> + log_err("Failed to update FWU metadata partitions\n");
> >>> + ret = -EIO;
> >>> + }
> >>> +
> >>> +out:
> >>> + free(mdata);
> >>> +
> >>> + return ret;
> >>> +}
> >>> +
> >>> +/**
> >>> + * 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)
> >>> +{
> >>> + int ret;
> >>> + const struct fwu_mdata_ops *ops = NULL;
> >>> + struct udevice *dev = NULL;
> >>> +
> >>> + ret = fwu_get_dev_ops(&dev, &ops);
> >>> + if (ret)
> >>> + return ret;
> >>> +
> >>> + if (!ops->get_image_alt_num) {
> >>> + log_err("get_image_alt_num() method not defined\n");
> >>> + return -ENOSYS;
> >>> + }
> >>> +
> >>> + return ops->get_image_alt_num(dev, image_type_id,
> >>> + update_bank, alt_num);
> >>> +}
> >>> +
> >>> +/**
> >>> + * fwu_mdata_check() - Check if the FWU metadata is valid
> >>> + *
> >>> + * Validate both copies of the FWU 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_mdata_check(void)
> >>> +{
> >>> + int ret;
> >>> + struct udevice *dev = NULL;
> >>> + const struct fwu_mdata_ops *ops = NULL;
> >>> +
> >>> + ret = fwu_get_dev_ops(&dev, &ops);
> >>> + if (ret)
> >>> + return ret;
> >>> +
> >>> + if (!ops->mdata_check) {
> >>> + log_err("mdata_check() method not defined\n");
> >>> + return -ENOSYS;
> >>> + }
> >>> +
> >>> + return ops->mdata_check(dev);
> >>> +}
> >>> +
> >>> +/**
> >>> + * fwu_revert_boot_index() - Revert the active index in the FWU metadata
> >>> + *
> >>> + * Revert the active_index value in the FWU metadata, by swapping the values
> >>> + * of active_index and previous_active_index in both copies of the
> >>> + * FWU metadata.
> >>> + *
> >>> + * Return: 0 if OK, -ve on error
> >>> + *
> >>> + */
> >>> +int fwu_revert_boot_index(void)
> >>> +{
> >>> + int ret;
> >>> + void *buf;
> >>> + u32 cur_active_index;
> >>> + struct fwu_mdata *mdata = NULL;
> >>> +
> >>> + ret = fwu_get_mdata(&mdata);
> >>> + if (ret < 0) {
> >>> + log_err("Unable to get valid FWU metadata\n");
> >>> + goto out;
> >>> + }
> >>> +
> >>> + /*
> >>> + * Swap the active index and previous_active_index fields
> >>> + * in the FWU metadata
> >>> + */
> >>> + cur_active_index = mdata->active_index;
> >>> + mdata->active_index = mdata->previous_active_index;
> >>> + mdata->previous_active_index = cur_active_index;
> >>> +
> >>> + /*
> >>> + * Calculate the crc32 for the updated FWU metadata
> >>> + * and put the updated value in the FWU metadata crc32
> >>> + * field
> >>> + */
> >>> + buf = &mdata->version;
> >>> + mdata->crc32 = crc32(0, buf, sizeof(*mdata) - sizeof(u32));
> >>> +
> >>> + /*
> >>> + * Now write this updated FWU metadata to both the
> >>> + * FWU metadata partitions
> >>> + */
> >>> + ret = fwu_update_mdata(mdata);
> >>> + if (ret < 0) {
> >>> + log_err("Failed to update FWU metadata partitions\n");
> >>> + ret = -EIO;
> >>> + }
> >>> +
> >>> +out:
> >>> + free(mdata);
> >>> +
> >>> + return ret;
> >>> +}
> >>> +
> >>> +/**
> >>> + * fwu_set_clear_image_accept() - Set or Clear the Acceptance bit for the image
> >>> + * @img_type_id: Guid of the image type for which the accepted bit is to be
> >>> + * set or cleared
> >>> + * @bank: Bank of which the image's Accept bit is to be set or cleared
> >>> + * @action: Action which specifies whether image's Accept bit is to be set or
> >>> + * cleared
> >>> + *
> >>> + * Set/Clear the accepted bit for the image specified by the img_guid parameter.
> >>> + * This indicates acceptance or rejection of image for subsequent boots by some
> >>> + * governing component like OS(or firmware).
> >>> + *
> >>> + * Return: 0 if OK, -ve on error
> >>> + *
> >>> + */
> >>> +static int fwu_set_clear_image_accept(efi_guid_t *img_type_id,
> >>> + u32 bank, u8 action)
> >>> +{
> >>> + void *buf;
> >>> + int ret, i;
> >>> + u32 nimages;
> >>> + struct fwu_mdata *mdata = NULL;
> >>> + struct fwu_image_entry *img_entry;
> >>> + struct fwu_image_bank_info *img_bank_info;
> >>> +
> >>> + ret = fwu_get_mdata(&mdata);
> >>> + if (ret < 0) {
> >>> + log_err("Unable to get valid FWU metadata\n");
> >>> + goto out;
> >>> + }
> >>> +
> >>> + nimages = CONFIG_FWU_NUM_IMAGES_PER_BANK;
> >>> + img_entry = &mdata->img_entry[0];
> >>> + for (i = 0; i < nimages; i++) {
> >>> + if (!guidcmp(&img_entry[i].image_type_uuid, img_type_id)) {
> >>> + img_bank_info = &img_entry[i].img_bank_info[bank];
> >>> + if (action == IMAGE_ACCEPT_SET)
> >>> + img_bank_info->accepted |= FWU_IMAGE_ACCEPTED;
> >>> + else
> >>> + img_bank_info->accepted = 0;
> >>> +
> >>> + buf = &mdata->version;
> >>> + mdata->crc32 = crc32(0, buf, sizeof(*mdata) -
> >>> + sizeof(u32));
> >>> +
> >>> + ret = fwu_update_mdata(mdata);
> >>> + goto out;
> >>> + }
> >>> + }
> >>> +
> >>> + /* Image not found */
> >>> + ret = -EINVAL;
> >>> +
> >>> +out:
> >>> + free(mdata);
> >>> +
> >>> + return ret;
> >>> +}
> >>> +
> >>> +/**
> >>> + * 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
> >>> + * @bank: Bank of which the image's Accept bit is to be set
> >>> + *
> >>> + * 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, u32 bank)
> >>> +{
> >>> + return fwu_set_clear_image_accept(img_type_id, bank,
> >>> + IMAGE_ACCEPT_SET);
> >>> +}
> >>> +
> >>> +/**
> >>> + * 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
> >>> + * @bank: Bank of which the image's Accept 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)
> >>> +{
> >>> + return fwu_set_clear_image_accept(img_type_id, bank,
> >>> + IMAGE_ACCEPT_CLEAR);
> >>> +}
> >>> +
> >>> +/**
> >>> + * fwu_get_mdata() - Get a FWU metadata copy
> >>> + * @mdata: Copy of the FWU metadata
> >>> + *
> >>> + * Get a valid copy of the FWU metadata.
> >>> + *
> >>> + * Return: 0 if OK, -ve on error
> >>> + *
> >>> + */
> >>> +int fwu_get_mdata(struct fwu_mdata **mdata)
> >>> +{
> >>> + int ret;
> >>> + struct udevice *dev = NULL;
> >>> + const struct fwu_mdata_ops *ops = NULL;
> >>> +
> >>> + ret = fwu_get_dev_ops(&dev, &ops);
> >>> + if (ret)
> >>> + return ret;
> >>> +
> >>> + if (!ops->get_mdata) {
> >>> + log_err("get_mdata() method not defined\n");
> >>> + return -ENOSYS;
> >>> + }
> >>> +
> >>> + return ops->get_mdata(dev, mdata);
> >>> +}
> >>> +
> >>> +/**
> >>> + * fwu_update_mdata() - Update the FWU metadata
> >>> + * @mdata: Copy of the FWU metadata
> >>> + *
> >>> + * Update the FWU metadata structure by writing to the
> >>> + * FWU metadata partitions.
> >>> + *
> >>> + * Return: 0 if OK, -ve on error
> >>> + *
> >>> + */
> >>> +int fwu_update_mdata(struct fwu_mdata *mdata)
> >>> +{
> >>> + int ret;
> >>> + struct udevice *dev = NULL;
> >>> + const struct fwu_mdata_ops *ops = NULL;
> >>> +
> >>> + ret = fwu_get_dev_ops(&dev, &ops);
> >>> + if (ret)
> >>> + return ret;
> >>> +
> >>> + if (!ops->update_mdata) {
> >>> + log_err("get_mdata() method not defined\n");
> >>> + return -ENOSYS;
> >>> + }
> >>> +
> >>> + return ops->update_mdata(dev, mdata);
> >>> +}
> >>> +
> >>> +UCLASS_DRIVER(fwu_mdata) = {
> >>> + .id = UCLASS_FWU_MDATA,
> >>> + .name = "fwu-mdata",
> >>> +};
> >>> diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
> >>> index 0e26e1d138..d0ab1c9235 100644
> >>> --- a/include/dm/uclass-id.h
> >>> +++ b/include/dm/uclass-id.h
> >>> @@ -54,6 +54,7 @@ enum uclass_id {
> >>> UCLASS_ETH_PHY, /* Ethernet PHY device */
> >>> UCLASS_FIRMWARE, /* Firmware */
> >>> UCLASS_FS_FIRMWARE_LOADER, /* Generic loader */
> >>> + UCLASS_FWU_MDATA, /* FWU Metadata Access */
> >>> UCLASS_GPIO, /* Bank of general-purpose I/O pins */
> >>> UCLASS_HASH, /* Hash device */
> >>> UCLASS_HWSPINLOCK, /* Hardware semaphores */
> >>> diff --git a/include/fwu.h b/include/fwu.h
> >>> new file mode 100644
> >>> index 0000000000..5a99c579fc
> >>> --- /dev/null
> >>> +++ b/include/fwu.h
> >>> @@ -0,0 +1,51 @@
> >>> +/* SPDX-License-Identifier: GPL-2.0+ */
> >>> +/*
> >>> + * Copyright (c) 2022, Linaro Limited
> >>> + */
> >>> +
> >>> +#if !defined _FWU_H_
> >>> +#define _FWU_H_
> >>> +
> >>> +#include <blk.h>
> >>> +#include <efi.h>
> >>> +
> >>> +#include <linux/types.h>
> >>> +
> >>> +struct fwu_mdata;
> >>> +struct udevice;
> >>> +
> >>> +/**
> >>> + * @get_image_alt_num: get the alt number to be used for the image
> >>> + * @mdata_check: check the validity of the FWU metadata partitions
> >>> + * @get_mdata() - Get a FWU metadata copy
> >>> + * @update_mdata() - Update the FWU metadata copy
> >>> + */
> >>> +struct fwu_mdata_ops {
> >>> + int (*get_image_alt_num)(struct udevice *dev, efi_guid_t image_type_id,
> >>> + u32 update_bank, int *alt_num);
> >>> +
> >>> + int (*mdata_check)(struct udevice *dev);
> >>> +
> >>> + int (*get_mdata)(struct udevice *dev, struct fwu_mdata **mdata);
> >>> +
> >>> + int (*update_mdata)(struct udevice *dev, struct fwu_mdata *mdata);
> >>> +};
> >>> +
> >>> +#define FWU_MDATA_VERSION 0x1
> >>> +
> >>> +#define FWU_MDATA_GUID \
> >>> + EFI_GUID(0x8a7a84a0, 0x8387, 0x40f6, 0xab, 0x41, \
> >>> + 0xa8, 0xb9, 0xa5, 0xa6, 0x0d, 0x23)
> >>> +
> >>> +int fwu_get_mdata(struct fwu_mdata **mdata);
> >>> +int fwu_update_mdata(struct fwu_mdata *mdata);
> >>> +int fwu_get_active_index(u32 *active_idx);
> >>> +int fwu_update_active_index(u32 active_idx);
> >>> +int fwu_get_image_alt_num(efi_guid_t image_type_id, u32 update_bank,
> >>> + int *alt_num);
> >>> +int fwu_mdata_check(void);
> >>> +int fwu_revert_boot_index(void);
> >>> +int fwu_accept_image(efi_guid_t *img_type_id, u32 bank);
> >>> +int fwu_clear_accept_image(efi_guid_t *img_type_id, u32 bank);
> >>> +
> >>> +#endif /* _FWU_H_ */
> >>> diff --git a/include/fwu_mdata.h b/include/fwu_mdata.h
> >>> new file mode 100644
> >>> index 0000000000..701efbba03
> >>> --- /dev/null
> >>> +++ b/include/fwu_mdata.h
> >>> @@ -0,0 +1,67 @@
> >>> +/* SPDX-License-Identifier: GPL-2.0+ */
> >>> +/*
> >>> + * Copyright (c) 2022, Linaro Limited
> >>> + */
> >>> +
> >>> +#if !defined _FWU_MDATA_H_
> >>> +#define _FWU_MDATA_H_
> >>> +
> >>> +#include <efi.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;
> >>> + uint32_t accepted;
> >>> + uint32_t reserved;
> >>> +} __attribute__((__packed__));
> >>> +
> >>> +/**
> >>> + * 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];
> >>> +} __attribute__((__packed__));
> >>> +
> >>> +/**
> >>> + * struct fwu_mdata - FWU metadata structure for multi-bank updates
> >>> + * @crc32: crc32 value for the FWU metadata
> >>> + * @version: FWU 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_mdata {
> >>> + uint32_t crc32;
> >>> + uint32_t version;
> >>> + uint32_t active_index;
> >>> + uint32_t previous_active_index;
> >>> +
> >>> + struct fwu_image_entry img_entry[CONFIG_FWU_NUM_IMAGES_PER_BANK];
> >>> +} __attribute__((__packed__));
> >>> +
> >>> +#endif /* _FWU_MDATA_H_ */
> >>> --
> >>> 2.17.1
> >>>
> >>
> >> One more thing. run kernel-doc to validate your description.
> >> [u-boot](eeee)$ ./scripts/kernel-doc -v -man
> >> drivers/fwu-mdata/fwu-mdata-uclass.c 1>/dev/null
> >> drivers/fwu-mdata/fwu-mdata-uclass.c:41: info: Scanning doc for fwu_verify_mdata
> >> drivers/fwu-mdata/fwu-mdata-uclass.c:70: info: Scanning doc for
> >> fwu_get_active_index
> >> drivers/fwu-mdata/fwu-mdata-uclass.c:107: info: Scanning doc for
> >> fwu_update_active_index
> >> drivers/fwu-mdata/fwu-mdata-uclass.c:164: info: Scanning doc for
> >> fwu_get_image_alt_num
> >> drivers/fwu-mdata/fwu-mdata-uclass.c:197: info: Scanning doc for fwu_mdata_check
> >> drivers/fwu-mdata/fwu-mdata-uclass.c:202: warning: contents before sections
> >> drivers/fwu-mdata/fwu-mdata-uclass.c:224: info: Scanning doc for
> >> fwu_revert_boot_index
> >> drivers/fwu-mdata/fwu-mdata-uclass.c:230: warning: contents before sections
> >> drivers/fwu-mdata/fwu-mdata-uclass.c:279: info: Scanning doc for
> >> fwu_set_clear_image_accept
> >> drivers/fwu-mdata/fwu-mdata-uclass.c:338: info: Scanning doc for
> >> fwu_accept_image
> >> drivers/fwu-mdata/fwu-mdata-uclass.c:357: info: Scanning doc for
> >> fwu_clear_accept_image
> >> drivers/fwu-mdata/fwu-mdata-uclass.c:377: info: Scanning doc for fwu_get_mdata
> >> drivers/fwu-mdata/fwu-mdata-uclass.c:404: info: Scanning doc for
> >> fwu_update_mdata
> >> 2 warnings
> >>
> >> when I run buildman over this series it is visible that it is not
> >> bisectable at all.
> >> CONFIG_FWU_NUM_BANKS is defined in this patch but the symbol is added
> >> much later.
> >> Please make sure every single patch is bisectable.
> >
> >
> > But how is this driver getting built in the first place -- the driver
> > is not enabling the config symbol which would result in the code
> > getting built. The idea is to add support for the driver and the
> > feature, and enable the functionality in the final patch. I have added
> > each patch separately and built for the qemu arm64 platform without
> > any issues.
>
> first of all I wasn't able to apply all patches because this series is not there.
> https://patchwork.ozlabs.org/project/uboot/list/?series=281549
> (better would be to use links to lore which are much easier to download)
You can download the mkeficapsule series from linaro's patchwork[1].
>
> That's why 2 patches weren't applied.
>
> And I just enabled configs which land in the tree for zynqmp virt and rebase
> this patch to be the first one. That's why all the time all existing Kconfigs
> were enabled when buildman build them.
Okay my understanding of a patch being bisectable was if the build
does not break after applying a patch. Please note that on top of my
series, you will need to define CONFIG_FWU_NUM_BANKS and
CONFIG_FWU_NUM_IMAGES_PER_BANK. I did not define that on purpose since
each platform would have it's own specific values.
-sughosh
[1] - https://patches.linaro.org/project/u-boot/list/?series=166236
> It is not that far from using the same defconfig with bisicting tree.
> You can definitely avoid it in your series.
>
> Thanks,
> Michal
>
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