[PATCH v15 10/15] FWU: Add support for the FWU Multi Bank Update feature
Ilias Apalodimas
ilias.apalodimas at linaro.org
Mon Oct 31 18:59:42 CET 2022
Hi Sughosh,
Ideally this would be better of as a different FMP, but I understand we are
missing some information (the capsule header) on the FMP level.
I think we can include it as is for now and have another look when we add
support for more boards
On Fri, Oct 21, 2022 at 06:16:03PM +0530, Sughosh Ganu wrote:
> The FWU Multi Bank Update feature supports updating firmware images
> to one of multiple sets(also called banks) of images. The firmware
> images are clubbed together in banks, with the system booting images
> from the active bank. Information on the images such as which bank
> they belong to is stored as part of the metadata structure, which is
> stored on the same storage media as the firmware images on a dedicated
> partition.
>
> At the time of update, the metadata is read to identify the bank to
> which the images need to be flashed(update bank). On a successful
> update, the metadata is modified to set the updated bank as active
> bank to subsequently boot from.
>
> Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>
> ---
> Changes since V14:
> * Initialise the return value to EFI_INVALID_PARAMETER in
> fwu_empty_capsule_process() and get rid of the else part as
> suggested by Ilias
> * Remove the superfluous assignment of EFI_SUCCESS in
> fwu_post_update_process() as suggested by Ilias
> * Add a check for fwu_empty_capsule_checks_pass() to allow application
> of empty capsules only in trial state
>
> drivers/Kconfig | 2 +
> drivers/Makefile | 1 +
> include/fwu.h | 30 +++++
> lib/Kconfig | 6 +
> lib/Makefile | 1 +
> lib/efi_loader/efi_capsule.c | 210 +++++++++++++++++++++++++++++++++-
> lib/efi_loader/efi_firmware.c | 14 +++
> lib/fwu_updates/Kconfig | 33 ++++++
> lib/fwu_updates/Makefile | 7 ++
> lib/fwu_updates/fwu.c | 22 ++++
> 10 files changed, 324 insertions(+), 2 deletions(-)
> create mode 100644 lib/fwu_updates/Kconfig
> create mode 100644 lib/fwu_updates/Makefile
>
> diff --git a/drivers/Kconfig b/drivers/Kconfig
> index 8b6fead351..75ac149d31 100644
> --- a/drivers/Kconfig
> +++ b/drivers/Kconfig
> @@ -44,6 +44,8 @@ source "drivers/fuzz/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 9d9f69a3c9..253cbfb71d 100644
> --- a/drivers/Makefile
> +++ b/drivers/Makefile
> @@ -85,6 +85,7 @@ obj-y += cache/
> obj-$(CONFIG_CPU) += cpu/
> obj-y += crypto/
> obj-$(CONFIG_FASTBOOT) += fastboot/
> +obj-$(CONFIG_FWU_MDATA) += fwu-mdata/
> obj-y += misc/
> obj-$(CONFIG_MMC) += mmc/
> obj-$(CONFIG_NVME) += nvme/
> diff --git a/include/fwu.h b/include/fwu.h
> index a8ed67b0e0..0919ced812 100644
> --- a/include/fwu.h
> +++ b/include/fwu.h
> @@ -98,6 +98,7 @@ struct fwu_mdata_ops {
> };
>
> #define FWU_MDATA_VERSION 0x1
> +#define FWU_IMAGE_ACCEPTED 0x1
>
> /*
> * GUID value defined in the FWU specification for identification
> @@ -107,6 +108,24 @@ struct fwu_mdata_ops {
> EFI_GUID(0x8a7a84a0, 0x8387, 0x40f6, 0xab, 0x41, \
> 0xa8, 0xb9, 0xa5, 0xa6, 0x0d, 0x23)
>
> +/*
> +* GUID value defined in the Dependable Boot specification for
> +* identification of the revert capsule, used for reverting
> +* any image in the updated bank.
> +*/
> +#define FWU_OS_REQUEST_FW_REVERT_GUID \
> + EFI_GUID(0xacd58b4b, 0xc0e8, 0x475f, 0x99, 0xb5, \
> + 0x6b, 0x3f, 0x7e, 0x07, 0xaa, 0xf0)
> +
> +/*
> +* GUID value defined in the Dependable Boot specification for
> +* identification of the accept capsule, used for accepting
> +* an image in the updated bank.
> +*/
> +#define FWU_OS_REQUEST_FW_ACCEPT_GUID \
> + EFI_GUID(0x0c996046, 0xbcc0, 0x4d04, 0x85, 0xec, \
> + 0xe1, 0xfc, 0xed, 0xf1, 0xc6, 0xf8)
> +
> /**
> * fwu_check_mdata_validity() - Check for validity of the FWU metadata copies
> *
> @@ -379,4 +398,15 @@ u8 fwu_update_checks_pass(void);
> */
> u8 fwu_empty_capsule_checks_pass(void);
>
> +/**
> + * fwu_trial_state_ctr_start() - Start the Trial State counter
> + *
> + * Start the counter to identify the platform booting in the
> + * Trial State. The counter is implemented as an EFI variable.
> + *
> + * Return: 0 if OK, -ve on error
> + *
> + */
> +int fwu_trial_state_ctr_start(void);
> +
> #endif /* _FWU_H_ */
> diff --git a/lib/Kconfig b/lib/Kconfig
> index 6121c80dc8..6abe1d0a86 100644
> --- a/lib/Kconfig
> +++ b/lib/Kconfig
> @@ -978,3 +978,9 @@ config LMB_RESERVED_REGIONS
> memory blocks.
>
> endmenu
> +
> +menu "FWU Multi Bank Updates"
> +
> +source lib/fwu_updates/Kconfig
> +
> +endmenu
> diff --git a/lib/Makefile b/lib/Makefile
> index e3deb15287..f2cfd1e428 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -9,6 +9,7 @@ obj-$(CONFIG_EFI) += efi/
> obj-$(CONFIG_EFI_LOADER) += efi_driver/
> obj-$(CONFIG_EFI_LOADER) += efi_loader/
> obj-$(CONFIG_CMD_BOOTEFI_SELFTEST) += efi_selftest/
> +obj-$(CONFIG_FWU_MULTI_BANK_UPDATE) += fwu_updates/
> obj-$(CONFIG_LZMA) += lzma/
> obj-$(CONFIG_BZIP2) += bzip2/
> obj-$(CONFIG_FIT) += libfdt/
> diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
> index 397e393a18..1163a2ee30 100644
> --- a/lib/efi_loader/efi_capsule.c
> +++ b/lib/efi_loader/efi_capsule.c
> @@ -14,6 +14,7 @@
> #include <env.h>
> #include <fdtdec.h>
> #include <fs.h>
> +#include <fwu.h>
> #include <hang.h>
> #include <malloc.h>
> #include <mapmem.h>
> @@ -32,6 +33,12 @@ static const efi_guid_t efi_guid_firmware_management_capsule_id =
> EFI_FIRMWARE_MANAGEMENT_CAPSULE_ID_GUID;
> const efi_guid_t efi_guid_firmware_management_protocol =
> EFI_FIRMWARE_MANAGEMENT_PROTOCOL_GUID;
> +const efi_guid_t fwu_guid_os_request_fw_revert =
> + FWU_OS_REQUEST_FW_REVERT_GUID;
> +const efi_guid_t fwu_guid_os_request_fw_accept =
> + FWU_OS_REQUEST_FW_ACCEPT_GUID;
> +
> +#define FW_ACCEPT_OS (u32)0x8000
>
> #ifdef CONFIG_EFI_CAPSULE_ON_DISK
> /* for file system access */
> @@ -386,6 +393,132 @@ efi_status_t efi_capsule_authenticate(const void *capsule, efi_uintn_t capsule_s
> }
> #endif /* CONFIG_EFI_CAPSULE_AUTHENTICATE */
>
> +static __maybe_unused bool fwu_empty_capsule(struct efi_capsule_header *capsule)
> +{
> + return !guidcmp(&capsule->capsule_guid,
> + &fwu_guid_os_request_fw_revert) ||
> + !guidcmp(&capsule->capsule_guid,
> + &fwu_guid_os_request_fw_accept);
> +}
> +
> +static __maybe_unused efi_status_t fwu_to_efi_error(int err)
> +{
> + efi_status_t ret;
> +
> + switch(err) {
> + case 0:
> + ret = EFI_SUCCESS;
> + break;
> + case -ERANGE:
> + case -EIO:
> + ret = EFI_DEVICE_ERROR;
> + break;
> + case -EINVAL:
> + ret = EFI_INVALID_PARAMETER;
> + break;
> + case -ENODEV:
> + ret = EFI_NOT_FOUND;
> + break;
> + default:
> + ret = EFI_OUT_OF_RESOURCES;
> + }
> +
> + return ret;
> +}
> +
> +static __maybe_unused efi_status_t fwu_empty_capsule_process(
> + struct efi_capsule_header *capsule)
> +{
> + int status;
> + u32 active_idx;
> + efi_guid_t *image_guid;
> + efi_status_t ret = EFI_INVALID_PARAMETER;
> +
> + if (!guidcmp(&capsule->capsule_guid,
> + &fwu_guid_os_request_fw_revert)) {
> + /*
> + * One of the previously updated image has
> + * failed the OS acceptance test. OS has
> + * requested to revert back to the earlier
> + * boot index
> + */
> + status = fwu_revert_boot_index();
> + ret = fwu_to_efi_error(status);
> + if (ret == EFI_SUCCESS)
> + log_debug("Reverted the FWU active_index. Recommend rebooting the system\n");
> + else
> + log_err("Failed to revert the FWU boot index\n");
> + } else if (!guidcmp(&capsule->capsule_guid,
> + &fwu_guid_os_request_fw_accept)) {
> + /*
> + * Image accepted by the OS. Set the acceptance
> + * status for the image.
> + */
> + image_guid = (void *)(char *)capsule +
> + capsule->header_size;
> +
> + status = fwu_get_active_index(&active_idx);
> + ret = fwu_to_efi_error(status);
> + if (ret != EFI_SUCCESS) {
> + log_err("Unable to get the active_index from the FWU metadata\n");
> + return ret;
> + }
> +
> + status = fwu_accept_image(image_guid, active_idx);
> + ret = fwu_to_efi_error(status);
> + if (ret != EFI_SUCCESS)
> + log_err("Unable to set the Accept bit for the image %pUs\n",
> + image_guid);
> + }
> +
> + return ret;
> +}
> +
> +static __maybe_unused void fwu_post_update_checks(
> + struct efi_capsule_header *capsule,
> + bool *fw_accept_os, bool *capsule_update)
> +{
> + if (fwu_empty_capsule(capsule))
> + *capsule_update = false;
> + else
> + if (!*fw_accept_os)
> + *fw_accept_os =
> + capsule->flags & FW_ACCEPT_OS ? true : false;
> +}
> +
> +static __maybe_unused efi_status_t fwu_post_update_process(bool fw_accept_os)
> +{
> + int status;
> + uint update_index;
> + efi_status_t ret;
> +
> + status = fwu_plat_get_update_index(&update_index);
> + if (status < 0) {
> + log_err("Failed to get the FWU update_index value\n");
> + return EFI_DEVICE_ERROR;
> + }
> +
> + /*
> + * All the capsules have been updated successfully,
> + * update the FWU metadata.
> + */
> + log_debug("Update Complete. Now updating active_index to %u\n",
> + update_index);
> + status = fwu_set_active_index(update_index);
> + ret = fwu_to_efi_error(status);
> + if (ret != EFI_SUCCESS) {
> + log_err("Failed to update FWU metadata index values\n");
> + } else {
> + log_debug("Successfully updated the active_index\n");
> + if (fw_accept_os) {
> + status = fwu_trial_state_ctr_start();
> + if (status < 0)
> + ret = EFI_DEVICE_ERROR;
> + }
> + }
> +
> + return ret;
> +}
>
> /**
> * efi_capsule_update_firmware - update firmware from capsule
> @@ -408,7 +541,32 @@ static efi_status_t efi_capsule_update_firmware(
> int item;
> struct efi_firmware_management_protocol *fmp;
> u16 *abort_reason;
> + efi_guid_t *image_type_id;
> efi_status_t ret = EFI_SUCCESS;
> + int status;
> + uint update_index;
> + bool fw_accept_os;
> +
> + if (IS_ENABLED(CONFIG_FWU_MULTI_BANK_UPDATE)) {
> + if (fwu_empty_capsule_checks_pass() &&
> + fwu_empty_capsule(capsule_data))
> + return fwu_empty_capsule_process(capsule_data);
> +
> + if (!fwu_update_checks_pass()) {
> + log_err("FWU checks failed. Cannot start update\n");
> + return EFI_INVALID_PARAMETER;
> + }
> +
> +
> + /* Obtain the update_index from the platform */
> + status = fwu_plat_get_update_index(&update_index);
> + if (status < 0) {
> + log_err("Failed to get the FWU update_index value\n");
> + return EFI_DEVICE_ERROR;
> + }
> +
> + fw_accept_os = capsule_data->flags & FW_ACCEPT_OS ? 0x1 : 0x0;
> + }
>
> /* sanity check */
> if (capsule_data->header_size < sizeof(*capsule) ||
> @@ -495,6 +653,34 @@ static efi_status_t efi_capsule_update_firmware(
> efi_free_pool(abort_reason);
> goto out;
> }
> +
> + if (IS_ENABLED(CONFIG_FWU_MULTI_BANK_UPDATE)) {
> + image_type_id = &image->update_image_type_id;
> + if (!fw_accept_os) {
> + /*
> + * The OS will not be accepting the firmware
> + * images. Set the accept bit of all the
> + * images contained in this capsule.
> + */
> + status = fwu_accept_image(image_type_id,
> + update_index);
> + } else {
> + status = fwu_clear_accept_image(image_type_id,
> + update_index);
> + }
> + ret = fwu_to_efi_error(status);
> + if (ret != EFI_SUCCESS) {
> + log_err("Unable to %s the accept bit for the image %pUs\n",
> + fw_accept_os ? "clear" : "set",
> + image_type_id);
> + goto out;
> + }
> +
> + log_debug("%s the accepted bit for Image %pUs\n",
> + fw_accept_os ? "Cleared" : "Set",
> + image_type_id);
> + }
> +
> }
>
> out:
> @@ -1103,6 +1289,9 @@ efi_status_t efi_launch_capsules(void)
> u16 **files;
> unsigned int nfiles, index, i;
> efi_status_t ret;
> + bool capsule_update = true;
> + bool update_status = true;
> + bool fw_accept_os = false;
>
> if (check_run_capsules() != EFI_SUCCESS)
> return EFI_SUCCESS;
> @@ -1130,12 +1319,19 @@ efi_status_t efi_launch_capsules(void)
> ret = efi_capsule_read_file(files[i], &capsule);
> if (ret == EFI_SUCCESS) {
> ret = efi_capsule_update_firmware(capsule);
> - if (ret != EFI_SUCCESS)
> + if (ret != EFI_SUCCESS) {
> log_err("Applying capsule %ls failed.\n",
> files[i]);
> - else
> + update_status = false;
> + } else {
> log_info("Applying capsule %ls succeeded.\n",
> files[i]);
> + if (IS_ENABLED(CONFIG_FWU_MULTI_BANK_UPDATE)) {
> + fwu_post_update_checks(capsule,
> + &fw_accept_os,
> + &capsule_update);
> + }
> + }
>
> /* create CapsuleXXXX */
> set_capsule_result(index, capsule, ret);
> @@ -1143,6 +1339,7 @@ efi_status_t efi_launch_capsules(void)
> free(capsule);
> } else {
> log_err("Reading capsule %ls failed\n", files[i]);
> + update_status = false;
> }
> /* delete a capsule either in case of success or failure */
> ret = efi_capsule_delete_file(files[i]);
> @@ -1150,8 +1347,17 @@ efi_status_t efi_launch_capsules(void)
> log_err("Deleting capsule %ls failed\n",
> files[i]);
> }
> +
> efi_capsule_scan_done();
>
> + if (IS_ENABLED(CONFIG_FWU_MULTI_BANK_UPDATE)) {
> + if (capsule_update == true && update_status == true) {
> + ret = fwu_post_update_process(fw_accept_os);
> + } else if (capsule_update == true && update_status == false) {
> + log_err("All capsules were not updated. Not updating FWU metadata\n");
> + }
> + }
> +
> for (i = 0; i < nfiles; i++)
> free(files[i]);
> free(files);
> diff --git a/lib/efi_loader/efi_firmware.c b/lib/efi_loader/efi_firmware.c
> index 30cafd15ca..93e2b01c07 100644
> --- a/lib/efi_loader/efi_firmware.c
> +++ b/lib/efi_loader/efi_firmware.c
> @@ -10,6 +10,7 @@
> #include <charset.h>
> #include <dfu.h>
> #include <efi_loader.h>
> +#include <fwu.h>
> #include <image.h>
> #include <signatures.h>
>
> @@ -389,6 +390,7 @@ efi_status_t EFIAPI efi_firmware_raw_set_image(
> efi_status_t (*progress)(efi_uintn_t completion),
> u16 **abort_reason)
> {
> + int ret;
> efi_status_t status;
>
> EFI_ENTRY("%p %d %p %zu %p %p %p\n", this, image_index, image,
> @@ -401,6 +403,18 @@ efi_status_t EFIAPI efi_firmware_raw_set_image(
> if (status != EFI_SUCCESS)
> return EFI_EXIT(status);
>
> + if (IS_ENABLED(CONFIG_FWU_MULTI_BANK_UPDATE)) {
> + /*
> + * Based on the value of update bank, derive the
> + * image index value.
> + */
> + ret = fwu_get_image_index(&image_index);
> + if (ret) {
> + log_debug("Unable to get FWU image_index\n");
> + return EFI_EXIT(EFI_DEVICE_ERROR);
> + }
> + }
> +
> if (dfu_write_by_alt(image_index - 1, (void *)image, image_size,
> NULL, NULL))
> return EFI_EXIT(EFI_DEVICE_ERROR);
> diff --git a/lib/fwu_updates/Kconfig b/lib/fwu_updates/Kconfig
> new file mode 100644
> index 0000000000..78759e6618
> --- /dev/null
> +++ b/lib/fwu_updates/Kconfig
> @@ -0,0 +1,33 @@
> +config FWU_MULTI_BANK_UPDATE
> + bool "Enable FWU Multi Bank Update Feature"
> + depends on EFI_CAPSULE_ON_DISK
> + select PARTITION_TYPE_GUID
> + select EFI_SETUP_EARLY
> + imply EFI_CAPSULE_ON_DISK_EARLY
> + select EVENT
> + help
> + Feature for updating firmware images on platforms having
> + multiple banks(copies) of the firmware images. One of the
> + bank is selected for updating all the firmware components
> +
> +config FWU_NUM_BANKS
> + int "Number of Banks defined by the platform"
> + depends on FWU_MULTI_BANK_UPDATE
> + help
> + Define the number of banks of firmware images on a platform
> +
> +config FWU_NUM_IMAGES_PER_BANK
> + int "Number of firmware images per bank"
> + depends on FWU_MULTI_BANK_UPDATE
> + help
> + Define the number of firmware images per bank. This value
> + should be the same for all the banks.
> +
> +config FWU_TRIAL_STATE_CNT
> + int "Number of times system boots in Trial State"
> + depends on FWU_MULTI_BANK_UPDATE
> + default 3
> + help
> + With FWU Multi Bank Update feature enabled, number of times
> + the platform is allowed to boot in Trial State after an
> + update.
> diff --git a/lib/fwu_updates/Makefile b/lib/fwu_updates/Makefile
> new file mode 100644
> index 0000000000..1993088e5b
> --- /dev/null
> +++ b/lib/fwu_updates/Makefile
> @@ -0,0 +1,7 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +#
> +# Copyright (c) 2022, Linaro Limited
> +#
> +
> +obj-$(CONFIG_FWU_MULTI_BANK_UPDATE) += fwu.o
> +obj-$(CONFIG_FWU_MDATA_GPT_BLK) += fwu_gpt.o
> diff --git a/lib/fwu_updates/fwu.c b/lib/fwu_updates/fwu.c
> index c9a9022a59..6e159c050c 100644
> --- a/lib/fwu_updates/fwu.c
> +++ b/lib/fwu_updates/fwu.c
> @@ -630,6 +630,28 @@ u8 fwu_empty_capsule_checks_pass(void)
> return in_trial && boottime_check;
> }
>
> +/**
> + * fwu_trial_state_ctr_start() - Start the Trial State counter
> + *
> + * Start the counter to identify the platform booting in the
> + * Trial State. The counter is implemented as an EFI variable.
> + *
> + * Return: 0 if OK, -ve on error
> + *
> + */
> +int fwu_trial_state_ctr_start(void)
> +{
> + int ret;
> + u16 trial_state_ctr;
> +
> + trial_state_ctr = 0;
> + ret = trial_counter_update(&trial_state_ctr);
> + if (ret)
> + log_err("Unable to initialise TrialStateCtr\n");
> +
> + return ret;
> +}
> +
> static int fwu_boottime_checks(void *ctx, struct event *event)
> {
> int ret;
> --
> 2.34.1
>
Heinrich pls shout if you think otherwise
Acked-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
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