On Wed 31 Mar 02:33 CDT 2021, Arnaud Pouliquen wrote:
> A mechanism similar to the shutdown mailbox signal is implemented to
> detach a remote processor.
>
> Upon detachment, a signal is sent to the remote firmware, allowing it
> to perform specific actions such as stopping rpmsg communication.
>
> The Cortex-M hold boot is also disabled to allow the remote processor
> to restart in case of crash.
>
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliq...@foss.st.com>
> Reviewed-by: Mathieu Poirier <mathieu.poir...@linaro.org>
> Tested-by: Mathieu Poirier <mathieu.poir...@linaro.org>
> ---
> drivers/remoteproc/stm32_rproc.c | 39 ++++++++++++++++++++++++++++++--
> 1 file changed, 37 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/remoteproc/stm32_rproc.c
> b/drivers/remoteproc/stm32_rproc.c
> index 3d45f51de4d0..7353f9e7e7af 100644
> --- a/drivers/remoteproc/stm32_rproc.c
> +++ b/drivers/remoteproc/stm32_rproc.c
> @@ -28,7 +28,7 @@
> #define RELEASE_BOOT 1
>
> #define MBOX_NB_VQ 2
> -#define MBOX_NB_MBX 3
> +#define MBOX_NB_MBX 4
>
> #define STM32_SMC_RCC 0x82001000
> #define STM32_SMC_REG_WRITE 0x1
> @@ -38,6 +38,7 @@
> #define STM32_MBX_VQ1 "vq1"
> #define STM32_MBX_VQ1_ID 1
> #define STM32_MBX_SHUTDOWN "shutdown"
> +#define STM32_MBX_DETACH "detach"
>
> #define RSC_TBL_SIZE 1024
>
> @@ -336,6 +337,15 @@ static const struct stm32_mbox
> stm32_rproc_mbox[MBOX_NB_MBX] = {
> .tx_done = NULL,
> .tx_tout = 500, /* 500 ms time out */
> },
> + },
> + {
> + .name = STM32_MBX_DETACH,
> + .vq_id = -1,
> + .client = {
> + .tx_block = true,
> + .tx_done = NULL,
> + .tx_tout = 200, /* 200 ms time out to detach should be
> fair enough */
> + },
> }
> };
>
> @@ -461,6 +471,25 @@ static int stm32_rproc_attach(struct rproc *rproc)
> return stm32_rproc_set_hold_boot(rproc, true);
> }
>
> +static int stm32_rproc_detach(struct rproc *rproc)
> +{
> + struct stm32_rproc *ddata = rproc->priv;
> + int err, dummy_data, idx;
> +
> + /* Inform the remote processor of the detach */
> + idx = stm32_rproc_mbox_idx(rproc, STM32_MBX_DETACH);
> + if (idx >= 0 && ddata->mb[idx].chan) {
> + /* A dummy data is sent to allow to block on transmit */
> + err = mbox_send_message(ddata->mb[idx].chan,
> + &dummy_data);
Seems I posted my comment on v1, rather than this latest version. Please
let me know if we should do anything about this dummy_data.
Regards,
Bjorn
> + if (err < 0)
> + dev_warn(&rproc->dev, "warning: remote FW detach
> without ack\n");
> + }
> +
> + /* Allow remote processor to auto-reboot */
> + return stm32_rproc_set_hold_boot(rproc, false);
> +}
> +
> static int stm32_rproc_stop(struct rproc *rproc)
> {
> struct stm32_rproc *ddata = rproc->priv;
> @@ -597,7 +626,12 @@ stm32_rproc_get_loaded_rsc_table(struct rproc *rproc,
> size_t *table_sz)
> }
>
> done:
> - /* Assuming the resource table fits in 1kB is fair */
> + /*
> + * Assuming the resource table fits in 1kB is fair.
> + * Notice for the detach, that this 1 kB memory area has to be reserved
> in the coprocessor
> + * firmware for the resource table. On detach, the remoteproc core
> re-initializes this
> + * entire area by overwriting it with the initial values stored in
> rproc->clean_table.
> + */
> *table_sz = RSC_TBL_SIZE;
> return (struct resource_table *)ddata->rsc_va;
> }
> @@ -607,6 +641,7 @@ static const struct rproc_ops st_rproc_ops = {
> .start = stm32_rproc_start,
> .stop = stm32_rproc_stop,
> .attach = stm32_rproc_attach,
> + .detach = stm32_rproc_detach,
> .kick = stm32_rproc_kick,
> .load = rproc_elf_load_segments,
> .parse_fw = stm32_rproc_parse_fw,
> --
> 2.17.1
>
