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ipc: backends: rpmsg: initialize shared memory to zero

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Added a code for initializing shared memory to zero. This operation
normalizes the memory state so that the IPC service is no longer
prone to reading status bits from the previous reset session.

Signed-off-by: Kamil Piszczek <Kamil.Piszczek@nordicsemi.no>
This commit is contained in:
Kamil Piszczek 2022-03-18 14:46:42 +01:00 committed by Carles Cufí
parent 92d8329d5b
commit 33408fa7af
2 changed files with 30 additions and 0 deletions
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9
subsys/ipc/ipc_service/backends/Kconfig.rpmsg
View file

@ -12,4 +12,13 @@ config IPC_SERVICE_BACKEND_RPMSG_WQ_STACK_SIZE
prevent notifying service users about received data from the system
work queue. Size is the same for all instances.
config IPC_SERVICE_BACKEND_RPMSG_SHMEM_RESET
bool "Reset shared memory state"
help
Some platforms retain the memory content upon reset. This is
problematic because the backend expects a zero-ed memory to be
able to correctly setup instances and endpoints at init time.
When this parameter is set to 'y' the status region of the shared
memory is reset on kernel initialization.
endif # IP_SERVICE_BACKEND_RPMSG

21
subsys/ipc/ipc_service/backends/ipc_rpmsg_static_vrings.c
View file

@ -508,3 +508,24 @@ static int backend_init(const struct device *instance)
&backend_ops);
DT_INST_FOREACH_STATUS_OKAY(DEFINE_BACKEND_DEVICE)
#define BACKEND_CONFIG_INIT(n) &backend_config_##n,
#if defined(CONFIG_IPC_SERVICE_BACKEND_RPMSG_SHMEM_RESET)
static int shared_memory_prepare(const struct device *arg)
{
static const struct backend_config_t *config[] = {
DT_INST_FOREACH_STATUS_OKAY(BACKEND_CONFIG_INIT)
};
for (int i = 0; i < DT_NUM_INST_STATUS_OKAY(DT_DRV_COMPAT); i++) {
if (config[i]->role == ROLE_HOST) {
memset((void *) config[i]->shm_addr, 0, VDEV_STATUS_SIZE);
}
}
return 0;
}
SYS_INIT(shared_memory_prepare, PRE_KERNEL_1, 1);
#endif /* CONFIG_IPC_SERVICE_BACKEND_RPMSG_SHMEM_RESET */