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Date: Tue, 29 May 2018 15:30:01 +0000
From: Fabien DESSENNE <fabien.dessenne@...com>
To: Arnaud POULIQUEN <arnaud.pouliquen@...com>,
Alex Elder <elder@...aro.org>,
"ohad@...ery.com" <ohad@...ery.com>,
"bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>
CC: "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5] remoteproc: Introduce prepare and unprepare for
subdevices
Hi,
Adding my 'Tested-by'.
BR,
Fabien
On 29/05/18 17:26, Arnaud Pouliquen wrote:
> Hi Fabien,
> Please , could you add your "Tested-by" as you test it on ST platform?
>
> Thanks
> Arnaud
>
> On 05/15/2018 10:53 PM, Alex Elder wrote:
>> From: Bjorn Andersson <bjorn.andersson@...aro.org>
>>
>> On rare occasions a subdevice might need to prepare some hardware
>> resources before a remote processor is booted, and clean up some
>> state after it has been shut down.
>>
>> One such example is the IP Accelerator found in various Qualcomm
>> platforms, which is accessed directly from both the modem remoteproc
>> and the application subsystem and requires an intricate lockstep
>> process when bringing the modem up and down.
>>
>> [elder@...aro.org: minor description and comment edits]
>>
>> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
>> Acked-by: Alex Elder <elder@...aro.org>
Tested-by: Fabien Dessenne <fabien.dessenne@...com>
>> ---
>> drivers/remoteproc/remoteproc_core.c | 56 ++++++++++++++++++++++++++--
>> include/linux/remoteproc.h | 4 ++
>> 2 files changed, 57 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
>> index 2ede7ae6f5bc..283b258f5e0f 100644
>> --- a/drivers/remoteproc/remoteproc_core.c
>> +++ b/drivers/remoteproc/remoteproc_core.c
>> @@ -776,6 +776,30 @@ static int rproc_handle_resources(struct rproc *rproc,
>> return ret;
>> }
>>
>> +static int rproc_prepare_subdevices(struct rproc *rproc)
>> +{
>> + struct rproc_subdev *subdev;
>> + int ret;
>> +
>> + list_for_each_entry(subdev, &rproc->subdevs, node) {
>> + if (subdev->prepare) {
>> + ret = subdev->prepare(subdev);
>> + if (ret)
>> + goto unroll_preparation;
>> + }
>> + }
>> +
>> + return 0;
>> +
>> +unroll_preparation:
>> + list_for_each_entry_continue_reverse(subdev, &rproc->subdevs, node) {
>> + if (subdev->unprepare)
>> + subdev->unprepare(subdev);
>> + }
>> +
>> + return ret;
>> +}
>> +
>> static int rproc_start_subdevices(struct rproc *rproc)
>> {
>> struct rproc_subdev *subdev;
>> @@ -810,6 +834,16 @@ static void rproc_stop_subdevices(struct rproc *rproc, bool crashed)
>> }
>> }
>>
>> +static void rproc_unprepare_subdevices(struct rproc *rproc)
>> +{
>> + struct rproc_subdev *subdev;
>> +
>> + list_for_each_entry_reverse(subdev, &rproc->subdevs, node) {
>> + if (subdev->unprepare)
>> + subdev->unprepare(subdev);
>> + }
>> +}
>> +
>> /**
>> * rproc_coredump_cleanup() - clean up dump_segments list
>> * @rproc: the remote processor handle
>> @@ -902,11 +936,18 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
>> rproc->table_ptr = loaded_table;
>> }
>>
>> + ret = rproc_prepare_subdevices(rproc);
>> + if (ret) {
>> + dev_err(dev, "failed to prepare subdevices for %s: %d\n",
>> + rproc->name, ret);
>> + return ret;
>> + }
>> +
>> /* power up the remote processor */
>> ret = rproc->ops->start(rproc);
>> if (ret) {
>> dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret);
>> - return ret;
>> + goto unprepare_subdevices;
>> }
>>
>> /* Start any subdevices for the remote processor */
>> @@ -914,8 +955,7 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
>> if (ret) {
>> dev_err(dev, "failed to probe subdevices for %s: %d\n",
>> rproc->name, ret);
>> - rproc->ops->stop(rproc);
>> - return ret;
>> + goto stop_rproc;
>> }
>>
>> rproc->state = RPROC_RUNNING;
>> @@ -923,6 +963,14 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
>> dev_info(dev, "remote processor %s is now up\n", rproc->name);
>>
>> return 0;
>> +
>> +stop_rproc:
>> + rproc->ops->stop(rproc);
>> +
>> +unprepare_subdevices:
>> + rproc_unprepare_subdevices(rproc);
>> +
>> + return ret;
>> }
>>
>> /*
>> @@ -1035,6 +1083,8 @@ static int rproc_stop(struct rproc *rproc, bool crashed)
>> return ret;
>> }
>>
>> + rproc_unprepare_subdevices(rproc);
>> +
>> rproc->state = RPROC_OFFLINE;
>>
>> dev_info(dev, "stopped remote processor %s\n", rproc->name);
>> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
>> index 8f1426330cca..e3c5d856b6da 100644
>> --- a/include/linux/remoteproc.h
>> +++ b/include/linux/remoteproc.h
>> @@ -477,15 +477,19 @@ struct rproc {
>> /**
>> * struct rproc_subdev - subdevice tied to a remoteproc
>> * @node: list node related to the rproc subdevs list
>> + * @prepare: prepare function, called before the rproc is started
>> * @start: start function, called after the rproc has been started
>> * @stop: stop function, called before the rproc is stopped; the @crashed
>> * parameter indicates if this originates from a recovery
>> + * @unprepare: unprepare function, called after the rproc has been stopped
>> */
>> struct rproc_subdev {
>> struct list_head node;
>>
>> + int (*prepare)(struct rproc_subdev *subdev);
>> int (*start)(struct rproc_subdev *subdev);
>> void (*stop)(struct rproc_subdev *subdev, bool crashed);
>> + void (*unprepare)(struct rproc_subdev *subdev);
>> };
>>
>> /* we currently support only two vrings per rvdev */
>>
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