[PATCH v5 10/23] FWU: cmd: Add a command to read FWU metadata

[Michal Simek]

On 6/9/22 14:29, Sughosh Ganu wrote:
> Add a command to read the metadata as specified in the FWU
> specification and print the fields of the metadata.
> 
> Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>
> ---
>   cmd/Kconfig     |  7 +++++
>   cmd/Makefile    |  1 +
>   cmd/fwu_mdata.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++
>   3 files changed, 82 insertions(+)
>   create mode 100644 cmd/fwu_mdata.c
> 
> diff --git a/cmd/Kconfig b/cmd/Kconfig
> index 09193b61b9..275becd837 100644
> --- a/cmd/Kconfig
> +++ b/cmd/Kconfig
> @@ -144,6 +144,13 @@ config CMD_CPU
>   	  internal name) and clock frequency. Other information may be
>   	  available depending on the CPU driver.
>   
> +config CMD_FWU_METADATA
> +	bool "fwu metadata read"
> +	depends on FWU_MULTI_BANK_UPDATE
> +	default y if FWU_MULTI_BANK_UPDATE
> +	help
> +	  Command to read the metadata and dump it's contents
> +
>   config CMD_LICENSE
>   	bool "license"
>   	select BUILD_BIN2C
> diff --git a/cmd/Makefile b/cmd/Makefile
> index 5e43a1e022..259a93bc65 100644
> --- a/cmd/Makefile
> +++ b/cmd/Makefile
> @@ -76,6 +76,7 @@ obj-$(CONFIG_CMD_FPGA) += fpga.o
>   obj-$(CONFIG_CMD_FPGAD) += fpgad.o
>   obj-$(CONFIG_CMD_FS_GENERIC) += fs.o
>   obj-$(CONFIG_CMD_FUSE) += fuse.o
> +obj-$(CONFIG_CMD_FWU_METADATA) += fwu_mdata.o
>   obj-$(CONFIG_CMD_GETTIME) += gettime.o
>   obj-$(CONFIG_CMD_GPIO) += gpio.o
>   obj-$(CONFIG_CMD_HVC) += smccc.o
> diff --git a/cmd/fwu_mdata.c b/cmd/fwu_mdata.c
> new file mode 100644
> index 0000000000..bc20ca26a3
> --- /dev/null
> +++ b/cmd/fwu_mdata.c
> @@ -0,0 +1,74 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (c) 2022, Linaro Limited
> + */
> +
> +#include <command.h>
> +#include <dm.h>
> +#include <fwu.h>
> +#include <fwu_mdata.h>
> +#include <log.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +
> +#include <linux/types.h>
> +
> +static void print_mdata(struct fwu_mdata *mdata)
> +{
> +	int i, j;
> +	struct fwu_image_entry *img_entry;
> +	struct fwu_image_bank_info *img_info;
> +	u32 nimages, nbanks;
> +
> +	printf("\tFWU Metadata\n");
> +	printf("crc32: %#x\n", mdata->crc32);
> +	printf("version: %#x\n", mdata->version);
> +	printf("active_index: %#x\n", mdata->active_index);
> +	printf("previous_active_index: %#x\n", mdata->previous_active_index);
> +
> +	nimages = CONFIG_FWU_NUM_IMAGES_PER_BANK;
> +	nbanks = CONFIG_FWU_NUM_BANKS;
> +	printf("\tImage Info\n");
> +	for (i = 0; i < nimages; i++) {
> +		img_entry = &mdata->img_entry[i];
> +		printf("\nImage Type Guid: %pUL\n", &img_entry->image_type_uuid);
> +		printf("Location Guid: %pUL\n", &img_entry->location_uuid);
> +		for (j = 0; j < nbanks; j++) {
> +			img_info = &img_entry->img_bank_info[j];
> +			printf("Image Guid:  %pUL\n", &img_info->image_uuid);
> +			printf("Image Acceptance: %#x\n", img_info->accepted);
> +		}
> +	}
> +}
> +
> +int do_fwu_mdata_read(struct cmd_tbl *cmdtp, int flag,
> +		     int argc, char * const argv[])
> +{
> +	struct udevice *dev;
> +	int ret = CMD_RET_SUCCESS;
> +	struct fwu_mdata *mdata = NULL;
> +
> +	if (uclass_get_device(UCLASS_FWU_MDATA, 0, &dev) || !dev) {
> +		log_err("Unable to get FWU metadata device\n");
> +		return CMD_RET_FAILURE;
> +	}
> +
> +	ret = fwu_get_mdata(&mdata);
> +	if (ret < 0) {
> +		log_err("Unable to get valid FWU metadata\n");
> +		ret = CMD_RET_FAILURE;
> +		goto out;
> +	}

I think here would be a need to also check data you get back.
I am playing with it and if I rewrite one copy and second copy is different I 
don't get any error message and I think it is wrong.
You should IMHO use mdata_check hooks to check that what you get is correct and 
aligned.

Thanks,
Michal