On 3/11/21 12:53 AM, Bjorn Andersson wrote:
> On Wed 10 Mar 15:10 CST 2021, Mathieu Poirier wrote:
>
>> When a remote processor that was attached to is stopped, special care
>> must be taken to make sure the shutdown process is similar to what
>> it would be had it been started by the remoteproc core.
>>
>> This patch takes care of that by making a copy of the resource
>> table currently used by the remote processor. From that point on
>> the copy is used, as if the remote processor had been started by
>> the remoteproc core.
>>
>> Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org>
>> ---
>> New for V7:
>> New Patch, used to be part of 11/16 in V6.
>> ---
>> drivers/remoteproc/remoteproc_core.c | 53 +++++++++++++++++++++++++++-
>> 1 file changed, 52 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/remoteproc/remoteproc_core.c
>> b/drivers/remoteproc/remoteproc_core.c
>> index e9ea2558432d..c488b1aa6119 100644
>> --- a/drivers/remoteproc/remoteproc_core.c
>> +++ b/drivers/remoteproc/remoteproc_core.c
>> @@ -1634,6 +1634,52 @@ static int rproc_reset_rsc_table_on_detach(struct
>> rproc *rproc)
>> return 0;
>> }
>>
>> +static int rproc_reset_rsc_table_on_stop(struct rproc *rproc)
>> +{
>> + struct resource_table *table_ptr;
>> +
>> + /* A resource table was never retrieved, nothing to do here */
>> + if (!rproc->table_ptr)
>> + return 0;
>> +
>> + /*
>> + * If a cache table exists the remote processor was started by
>> + * the remoteproc core. That cache table should be used for
>> + * the rest of the shutdown process.
>> + */
>> + if (rproc->cached_table)
>> + goto out;
>> +
>> + /* Remember where the external entity installed the resource table */
>> + table_ptr = rproc->table_ptr;
>> +
>
> Afaict this is just a remnant from the detach case.
>
> I think the series looks really good now, please let me know and I can
> drop the local "table_ptr" as I apply the patches.
>
Just a minor comment on patch 11, then the series LGTM also,
For this one
Reviewed-by: Arnaud Pouliquen <arnaud.pouliq...@st.com>
Thanks,
Arnaud
> Regards,
> Bjorn
>
>> + /*
>> + * If we made it here the remote processor was started by another
>> + * entity and a cache table doesn't exist. As such make a copy of
>> + * the resource table currently used by the remote processor and
>> + * use that for the rest of the shutdown process. The memory
>> + * allocated here is free'd in rproc_shutdown().
>> + */
>> + rproc->cached_table = kmemdup(rproc->table_ptr,
>> + rproc->table_sz, GFP_KERNEL);
>> + if (!rproc->cached_table)
>> + return -ENOMEM;
>> +
>> + /*
>> + * Since the remote processor is being switched off the clean table
>> + * won't be needed. Allocated in rproc_set_rsc_table().
>> + */
>> + kfree(rproc->clean_table);
>> +
>> +out:
>> + /*
>> + * Use a copy of the resource table for the remainder of the
>> + * shutdown process.
>> + */
>> + rproc->table_ptr = rproc->cached_table;
>> + return 0;
>> +}
>> +
>> /*
>> * Attach to remote processor - similar to rproc_fw_boot() but without
>> * the steps that deal with the firmware image.
>> @@ -1759,7 +1805,12 @@ static int rproc_stop(struct rproc *rproc, bool
>> crashed)
>> rproc_stop_subdevices(rproc, crashed);
>>
>> /* the installed resource table is no longer accessible */
>> - rproc->table_ptr = rproc->cached_table;
>> + ret = rproc_reset_rsc_table_on_stop(rproc);
>> + if (ret) {
>> + dev_err(dev, "can't reset resource table: %d\n", ret);
>> + return ret;
>> + }
>> +
>>
>> /* power off the remote processor */
>> ret = rproc->ops->stop(rproc);
>> --
>> 2.25.1
>>
