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From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: sibis@codeaurora.org
Cc: srinivas.kandagatla@linaro.org, robh+dt@kernel.org,
	tsoni@codeaurora.org, agross@kernel.org, mark.rutland@arm.com,
	linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	rnayak@codeaurora.org
Subject: Re: [PATCH 1/3] soc: qcom: Introduce Protection Domain Restart helpers
Date: Tue, 19 Nov 2019 15:17:40 -0800
Message-ID: <20191119231740.GJ18024@yoga> (raw)
In-Reply-To: <0101016e832bd54d-453473ee-c0fa-44f5-a873-55b97dff4a9a-000000@us-west-2.amazonses.com>

On Tue 19 Nov 02:18 PST 2019, sibis@codeaurora.org wrote:

> Hey Bjorn,
> Thanks for taking the time to
> review the series :)
> 
> On 2019-11-19 12:10, Bjorn Andersson wrote:
> > On Mon 18 Nov 06:27 PST 2019, Sibi Sankar wrote:
> > > diff --git a/drivers/soc/qcom/pdr_interface.c
> > > b/drivers/soc/qcom/pdr_interface.c
> > [..]
> > > +static void pdr_indack_work(struct work_struct *work)
> > > +{
> > > +	struct pdr_handle *pdr = container_of(work, struct pdr_handle,
> > > +					      indack_work);
> > > +	struct pdr_list_node *ind, *tmp;
> > > +	struct pdr_service *pds;
> > > +
> > > +	list_for_each_entry_safe(ind, tmp, &pdr->indack_list, node) {
> > > +		pds = ind->pds;
> > > +		pdr_send_indack_msg(pdr, pds, ind->transaction_id);
> > 
> > So when we et a ind_cb with the new status, we need to send an ack
> > request, which will result in a response, just to confirm that we got
> > the event?
> > 
> > Seems like we should fix the qmi code to make it possible to send a
> > request from the indication handler and then we could simply ignore the
> 
> yeah maybe having a provision to send custom requests back on
> indication would be the way to go. Not all indication need to be
> services with requests.
> 

Let's put this on the todo list.

> > response. Or do we need to not pdr->status() until we get the response
> > for some reason?
> 
> adsp waits on the ack response for a fixed duration and seems to throw
> a fatal err is the ack is not serviced. Hence holding back pd->status
> till we service the ack here.
> 

You mean to ensure that someone sleeping in pd->status() doesn't delay
that until its too late?

[..]
> > > +int pdr_handle_init(struct pdr_handle *pdr,
> > > +		    int (*status)(struct pdr_handle *pdr,
> > > +				  struct pdr_service *pds))
> > > +{
> > [..]
> > > +	pdr->servreg_wq = create_singlethread_workqueue("pdr_servreg_wq");
> > > +	if (!pdr->servreg_wq)
> > > +		return -ENOMEM;
> > > +
> > > +	pdr->indack_wq = alloc_ordered_workqueue("pdr_indack_wq",
> > > WQ_HIGHPRI);
> > 
> > The two workqueues means that we should be able to call pdr->status()
> > rom two concurrent contexts, I don't think our clients will expect that.
> > 
> 
> would creating another ordered wq to relay all the pd->status make
> sense?
> 

I would prefer less work queues ;) But I presume you split out the
indack_wq in order to improve the likelihood of meeting the latency
requirements of the remote side.

Perhaps just wrap the status() calls with a status-mutex and then remove
that by reworking the QMI interface to allow us to remove the indack
work?

Regards,
Bjorn

  parent reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20191118142728.30187-1-sibis@codeaurora.org>
2019-11-18 14:27 ` Sibi Sankar
2019-11-18 14:28 ` [PATCH 2/3] dt-bindings: soc: qcom: apr: Add protection domain bindings Sibi Sankar
2019-11-18 14:28 ` [PATCH 3/3] soc: qcom: apr: Add avs/audio tracking functionality Sibi Sankar
     [not found] ` <0101016e7ee9c786-fcf80f4e-9b57-4d6b-8806-9ca408e21b55-000000@us-west-2.amazonses.com>
2019-11-19  5:49   ` [PATCH 2/3] dt-bindings: soc: qcom: apr: Add protection domain bindings Bjorn Andersson
2019-11-21 16:04   ` Srinivas Kandagatla
     [not found] ` <0101016e7ee9be5e-1d6bbe06-4bab-434d-9040-ebfa3918b213-000000@us-west-2.amazonses.com>
2019-11-19  6:40   ` [PATCH 1/3] soc: qcom: Introduce Protection Domain Restart helpers Bjorn Andersson
2019-11-19 10:18     ` sibis
     [not found]     ` <0101016e832bd54d-453473ee-c0fa-44f5-a873-55b97dff4a9a-000000@us-west-2.amazonses.com>
2019-11-19 23:17       ` Bjorn Andersson [this message]
2019-11-20 12:12         ` Sibi Sankar
     [not found] ` <0101016e7ee9d8b5-9759d0ba-4acf-4fc4-a863-fac9c738397f-000000@us-west-2.amazonses.com>
2019-11-19  6:53   ` [PATCH 3/3] soc: qcom: apr: Add avs/audio tracking functionality Bjorn Andersson
2019-11-19 10:25     ` sibis
     [not found] ` <0101016e7ee9c591-d04928e8-6440-488c-a956-3b5c9b8988bf-000000@us-west-2.amazonses.com>
2019-12-03 21:52   ` [PATCH 2/3] dt-bindings: soc: qcom: apr: Add protection domain bindings Rob Herring
2019-12-16 17:46     ` Sibi Sankar

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