Sughosh, On Sun, Dec 19, 2021 at 12:36:03PM +0530, Sughosh Ganu wrote: > The FWU Multi Bank Update specification requires the Update Agent to > carry out certain checks at the time of platform boot. The Update > Agent is the component which is responsible for updating the firmware > components and maintaining and keeping the metadata in sync. > > The spec requires that the Update Agent perform the following checks > at the time of boot > * Sanity check of both the metadata copies maintained by the platform. > * Get the boot index passed to U-Boot by the prior stage bootloader > and use this value for metadata bookkeeping. > * Check if the system is booting in Trial State. If the system boots > in the Trial State for more than a specified number of boot counts, > change the Active Bank to be booting the platform from. > > Add these checks in the board initialisation sequence, invoked after > relocation. > > Signed-off-by: Sughosh Ganu <sughosh.g...@linaro.org> > --- > Changes since V1: > * Define a funtion fwu_update_checks_pass to do the checks > before initiating the update > * Log the status of the boottime checks using boottime_check > variable and allow system to boot instead of hanging the > platform(fwu_boottime_checks) > > common/board_r.c | 6 ++ > include/fwu.h | 3 + > lib/fwu_updates/fwu.c | 163 ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 172 insertions(+) > create mode 100644 lib/fwu_updates/fwu.c > > diff --git a/common/board_r.c b/common/board_r.c > index 31a59c585a..81678870b9 100644 > --- a/common/board_r.c > +++ b/common/board_r.c > @@ -78,6 +78,9 @@ > #ifdef CONFIG_EFI_SETUP_EARLY > #include <efi_loader.h> > #endif > +#ifdef CONFIG_FWU_MULTI_BANK_UPDATE > +#include <fwu.h> > +#endif > > DECLARE_GLOBAL_DATA_PTR; > > @@ -805,6 +808,9 @@ static init_fnc_t init_sequence_r[] = { > #endif > #ifdef CONFIG_EFI_SETUP_EARLY > (init_fnc_t)efi_init_obj_list, > +#endif > +#ifdef CONFIG_FWU_MULTI_BANK_UPDATE > + fwu_boottime_checks, > #endif
Maybe I don't understand your code well. Why do you want to call fwu_boottime_checks() here? Why not in CONFIG_EFI_CAPSULE_UPDATE_EARLY (i.e. efi_launch_capsules() in main_loop())? -Takahiro Akashi > run_main_loop, > }; > diff --git a/include/fwu.h b/include/fwu.h > index 5ba437798d..2d2e674d6a 100644 > --- a/include/fwu.h > +++ b/include/fwu.h > @@ -16,6 +16,9 @@ > EFI_GUID(0x8a7a84a0, 0x8387, 0x40f6, 0xab, 0x41, \ > 0xa8, 0xb9, 0xa5, 0xa6, 0x0d, 0x23) > > +int fwu_boottime_checks(void); > +u8 fwu_update_checks_pass(void); > + > 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, > diff --git a/lib/fwu_updates/fwu.c b/lib/fwu_updates/fwu.c > new file mode 100644 > index 0000000000..e964f9b0b1 > --- /dev/null > +++ b/lib/fwu_updates/fwu.c > @@ -0,0 +1,163 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Copyright (c) 2021, Linaro Limited > + */ > + > +#include <efi.h> > +#include <efi_loader.h> > +#include <efi_variable.h> > +#include <fwu.h> > +#include <fwu_mdata.h> > +#include <malloc.h> > + > +#include <linux/errno.h> > +#include <linux/types.h> > + > +static u8 trial_state = 0; > +static u8 boottime_check = 0; > + > +static int fwu_trial_state_check(void) > +{ > + int ret, i; > + efi_status_t status; > + efi_uintn_t var_size; > + u16 trial_state_ctr; > + u32 nimages, active_bank, var_attributes, active_idx; > + 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) > + return ret; > + > + ret = 0; > + nimages = CONFIG_FWU_NUM_IMAGES_PER_BANK; > + active_bank = mdata->active_index; > + img_entry = &mdata->img_entry[0]; > + for (i = 0; i < nimages; i++) { > + img_bank_info = &img_entry[i].img_bank_info[active_bank]; > + if (!img_bank_info->accepted) { > + trial_state = 1; > + break; > + } > + } > + > + if (trial_state) { > + var_size = (efi_uintn_t)sizeof(trial_state_ctr); > + log_info("System booting in Trial State\n"); > + var_attributes = EFI_VARIABLE_NON_VOLATILE | > + EFI_VARIABLE_BOOTSERVICE_ACCESS | > + EFI_VARIABLE_RUNTIME_ACCESS; > + status = efi_get_variable_int(L"TrialStateCtr", > + &efi_global_variable_guid, > + &var_attributes, > + &var_size, &trial_state_ctr, > + NULL); > + if (status != EFI_SUCCESS) { > + log_err("Unable to read TrialStateCtr variable\n"); > + ret = -1; > + goto out; > + } > + > + ++trial_state_ctr; > + if (trial_state_ctr > CONFIG_FWU_TRIAL_STATE_CNT) { > + log_info("Trial State count exceeded. Revert back to > previous_active_index\n"); > + active_idx = mdata->active_index; > + ret = fwu_revert_boot_index(); > + if (ret < 0) { > + log_err("Unable to revert active_index\n"); > + goto out; > + } > + > + trial_state_ctr = 0; > + status = efi_set_variable_int(L"TrialStateCtr", > + &efi_global_variable_guid, > + var_attributes, > + 0, > + &trial_state_ctr, false); > + if (status != EFI_SUCCESS) { > + log_err("Unable to clear TrialStateCtr > variable\n"); > + ret = -1; > + goto out; > + } > + } else { > + status = efi_set_variable_int(L"TrialStateCtr", > + &efi_global_variable_guid, > + var_attributes, > + var_size, > + &trial_state_ctr, false); > + if (status != EFI_SUCCESS) { > + log_err("Unable to increment TrialStateCtr > variable\n"); > + ret = -1; > + goto out; > + } else { > + ret = 0; > + } > + } > + } > + > +out: > + free(mdata); > + return ret; > +} > + > +u8 fwu_update_checks_pass(void) > +{ > + return !trial_state && boottime_check; > +} > + > +int fwu_boottime_checks(void) > +{ > + int ret; > + u32 boot_idx, active_idx; > + > + ret = fwu_mdata_check(); > + if (ret < 0) { > + boottime_check = 0; > + return 0; > + } > + > + /* > + * Get the Boot Index, i.e. the bank from > + * which the platform has booted. This value > + * gets passed from the ealier stage bootloader > + * which booted u-boot, e.g. tf-a. If the > + * boot index is not the same as the > + * active_index read from the FWU metadata, > + * update the active_index. > + */ > + fwu_plat_get_bootidx(&boot_idx); > + if (boot_idx >= CONFIG_FWU_NUM_BANKS) { > + log_err("Received incorrect value of boot_index\n"); > + boottime_check = 0; > + return 0; > + } > + > + ret = fwu_get_active_index(&active_idx); > + if (ret < 0) { > + log_err("Unable to read active_index\n"); > + boottime_check = 0; > + return 0; > + } > + > + if (boot_idx != active_idx) { > + log_info("Boot idx %u is not matching active idx %u, changing > active_idx\n", > + boot_idx, active_idx); > + ret = fwu_update_active_index(boot_idx); > + if (ret < 0) > + boottime_check = 0; > + else > + boottime_check = 1; > + > + return 0; > + } > + > + ret = fwu_trial_state_check(); > + if (ret < 0) > + boottime_check = 0; > + else > + boottime_check = 1; > + > + return 0; > +} > -- > 2.17.1 >