[PATCH v3 4/8] mach-snapdragon: implement capsule update support
Sumit Garg
sumit.garg at linaro.org
Wed Jun 5 07:21:10 CEST 2024
Hi Caleb,
On Mon, 3 Jun 2024 at 18:19, Caleb Connolly <caleb.connolly at linaro.org> wrote:
>
> Qualcomm boards flash U-Boot to the boot partition, implement support
> for determining which slot U-Boot is running from and finding the
> correct boot partition for that slot and configuring the appropriate DFU
> string.
>
> For now this only supports boards with SCSI/UFS storage where U-Boot is
> flashed to the boot partition, and only U-Boot itself is updated. In the
> future we may also support updating additional firmware components (tz,
> hyp, xbl) as well as having U-Boot installed to other partitions (e.g.
> as a first-stage bootloader).
>
> Signed-off-by: Caleb Connolly <caleb.connolly at linaro.org>
> ---
> arch/arm/mach-snapdragon/Makefile | 1 +
> arch/arm/mach-snapdragon/board.c | 3 +
> arch/arm/mach-snapdragon/capsule_update.c | 147 ++++++++++++++++++++++++++++++
> arch/arm/mach-snapdragon/qcom-priv.h | 6 ++
> include/configs/qcom.h | 5 +
> 5 files changed, 162 insertions(+)
>
> diff --git a/arch/arm/mach-snapdragon/Makefile b/arch/arm/mach-snapdragon/Makefile
> index 7a4495c8108f..343e825c6fdd 100644
> --- a/arch/arm/mach-snapdragon/Makefile
> +++ b/arch/arm/mach-snapdragon/Makefile
> @@ -2,5 +2,6 @@
> #
> # (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
>
> obj-y += board.o
> +obj-$(CONFIG_EFI_HAVE_CAPSULE_SUPPORT) += capsule_update.o
> obj-$(CONFIG_OF_LIVE) += of_fixup.o
> diff --git a/arch/arm/mach-snapdragon/board.c b/arch/arm/mach-snapdragon/board.c
> index b439a19ec7eb..c4a3394706e6 100644
> --- a/arch/arm/mach-snapdragon/board.c
> +++ b/arch/arm/mach-snapdragon/board.c
> @@ -299,8 +299,11 @@ int board_late_init(void)
>
> configure_env();
> qcom_late_init();
>
> + /* Configure the dfu_string for capsule updates */
> + qcom_configure_capsule_updates();
> +
> return 0;
> }
>
> static void build_mem_map(void)
> diff --git a/arch/arm/mach-snapdragon/capsule_update.c b/arch/arm/mach-snapdragon/capsule_update.c
> new file mode 100644
> index 000000000000..505f5bf5ae07
> --- /dev/null
> +++ b/arch/arm/mach-snapdragon/capsule_update.c
> @@ -0,0 +1,147 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Common initialisation for Qualcomm Snapdragon boards.
> + *
> + * Copyright (c) 2024 Linaro Ltd.
> + * Author: Caleb Connolly <caleb.connolly at linaro.org>
> + */
> +
> +#define pr_fmt(fmt) "QCOM-FMP: " fmt
> +
> +#include <dm/device.h>
> +#include <dm/uclass.h>
> +#include <efi.h>
> +#include <efi_loader.h>
> +#include <malloc.h>
> +#include <scsi.h>
> +#include <part.h>
> +#include <linux/err.h>
> +
> +#include "qcom-priv.h"
> +
> +struct efi_fw_image fw_images[] = {
> + {
> + .image_type_id = QUALCOMM_UBOOT_BOOT_IMAGE_GUID,
> + .fw_name = u"QUALCOMM-UBOOT",
> + .image_index = 1,
> + },
> +};
> +
> +struct efi_capsule_update_info update_info = {
> + /* Filled in by configure_dfu_string() */
> + .dfu_string = NULL,
> + .num_images = ARRAY_SIZE(fw_images),
> + .images = fw_images,
> +};
> +
> +/* LSB first */
> +struct part_slot_status {
> + u16: 2;
> + u16 active : 1;
> + u16: 3;
> + u16 successful : 1;
> + u16 unbootable : 1;
> + u16 tries_remaining : 4;
> +};
> +
> +static int find_boot_partition(const char *partname, struct blk_desc *blk_dev, char *name)
> +{
> + int ret;
> + int partnum;
> + struct disk_partition info;
> + struct part_slot_status *slot_status;
> +
> + for (partnum = 1;; partnum++) {
> + ret = part_get_info(blk_dev, partnum, &info);
> + if (ret)
> + return ret;
> +
> + slot_status = (struct part_slot_status *)&info.type_flags;
> + log_io("%16s: Active: %1d, Successful: %1d, Unbootable: %1d, Tries left: %1d\n",
> + info.name, slot_status->active,
> + slot_status->successful, slot_status->unbootable,
> + slot_status->tries_remaining);
> + if (!strncmp(info.name, partname, strlen(partname)) && slot_status->active) {
> + log_debug("Found active %s partition: '%s'!\n", partname, info.name);
> + strlcpy(name, info.name, sizeof(info.name));
> + return partnum;
> + }
> + }
> +
> + return -1;
> +}
> +
> +/**
> + * qcom_configure_capsule_updates() - Configure the DFU string for capsule updates
> + *
> + * U-Boot is flashed to the boot partition on Qualcomm boards. In most cases there
> + * are two boot partitions, boot_a and boot_b. As we don't currently support doing
> + * full A/B updates, we only support updating the currently active boot partition.
> + *
> + * So we need to find the current slot suffix and the associated boot partition.
> + * We do this by looking for the boot partition that has the 'active' flag set
> + * in the GPT partition vendor attribute bits.
> + */
> +void qcom_configure_capsule_updates(void)
> +{
> + struct blk_desc *desc;
> + int ret = 0, partnum = -1, devnum;
> + static char dfu_string[32] = { 0 };
> + char name[32]; /* GPT partition name */
> + char *partname = "boot";
> + struct udevice *dev = NULL;
> +
> + /*
> + * There is currently no good way to check how U-Boot is booting, but we have
> + * a few hueristics, like here checking if our DTB has a kaslr-seed specified
> + * will tell us if we were chainloaded by another bootloader.
> + * FIXME: we should do this check once and use some proper API to expose the data.
If U-Boot is built with LINUX_KERNEL_IMAGE_HEADER enabled then we
should know that U-Boot is built as a replacement of Linux kernel and
hence chainloaded. Isn't that what you need here?
-Sumit
> + */
> + if (!ofnode_has_property(ofnode_path("/chosen"), "kaslr-seed")) {
> + log_debug("No initrd address present, skip as we might not be chainloaded\n");
> + return;
> + }
> +
> + if (IS_ENABLED(CONFIG_SCSI)) {
> + /* Scan for SCSI devices */
> + ret = scsi_scan(false);
> + if (ret) {
> + debug("Failed to scan SCSI devices: %d\n", ret);
> + return;
> + }
> + }
> +
> + uclass_foreach_dev_probe(UCLASS_BLK, dev) {
> + if (device_get_uclass_id(dev) != UCLASS_BLK)
> + continue;
> +
> + desc = dev_get_uclass_plat(dev);
> + if (!desc || desc->part_type == PART_TYPE_UNKNOWN)
> + continue;
> + devnum = desc->devnum;
> + partnum = find_boot_partition(partname, desc,
> + name);
> + if (partnum >= 0)
> + break;
> + }
> +
> + if (partnum < 0) {
> + log_err("Failed to find boot partition\n");
> + return;
> + }
> +
> + switch (desc->uclass_id) {
> + case UCLASS_SCSI:
> + snprintf(dfu_string, 32, "scsi %d=u-boot-bin part %d", devnum, partnum);
> + break;
> + case UCLASS_MMC:
> + snprintf(dfu_string, 32, "mmc 0=u-boot-bin part %d %d", devnum, partnum);
> + break;
> + default:
> + debug("Unsupported storage uclass: %d\n", desc->uclass_id);
> + return;
> + }
> + log_debug("boot partition is %s, DFU string: '%s'\n", name, dfu_string);
> +
> + update_info.dfu_string = dfu_string;
> +}
> diff --git a/arch/arm/mach-snapdragon/qcom-priv.h b/arch/arm/mach-snapdragon/qcom-priv.h
> index 0a7ed5eff8b8..74d39197b89f 100644
> --- a/arch/arm/mach-snapdragon/qcom-priv.h
> +++ b/arch/arm/mach-snapdragon/qcom-priv.h
> @@ -2,8 +2,14 @@
>
> #ifndef __QCOM_PRIV_H__
> #define __QCOM_PRIV_H__
>
> +#if IS_ENABLED(CONFIG_EFI_HAVE_CAPSULE_SUPPORT)
> +void qcom_configure_capsule_updates(void);
> +#else
> +void qcom_configure_capsule_updates(void) {}
> +#endif /* EFI_HAVE_CAPSULE_SUPPORT */
> +
> #if CONFIG_IS_ENABLED(OF_LIVE)
> /**
> * qcom_of_fixup_nodes() - Fixup Qualcomm DT nodes
> *
> diff --git a/include/configs/qcom.h b/include/configs/qcom.h
> index e50b3bce5cdd..b6b5acffe5e4 100644
> --- a/include/configs/qcom.h
> +++ b/include/configs/qcom.h
> @@ -10,8 +10,13 @@
> #define __CONFIGS_SNAPDRAGON_H
>
> #define CFG_SYS_BAUDRATE_TABLE { 115200, 230400, 460800, 921600 }
>
> +// 2a5aa852-b856-4d97-baa9-5c5f4421551f
> +#define QUALCOMM_UBOOT_BOOT_IMAGE_GUID \
> + EFI_GUID(0x2a5aa852, 0xb856, 0x4d97, 0xba, 0xa9, \
> + 0x5c, 0x5f, 0x44, 0x21, 0x55, 0x1f)
> +
> /* Load addressed are calculated during board_late_init(). See arm/mach-snapdragon/board.c */
> #define CFG_EXTRA_ENV_SETTINGS \
> "stdin=serial,button-kbd\0" \
> "stdout=serial,vidconsole\0" \
>
> --
> 2.45.0
>
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