Subject: RE: [RFC 7/7] ath10k: Handle rx thread suspend and resume

From: "Rakesh Pillai" <[email-masked]>
Date: Fri, 24 Jul 2020 11:49:46 +0530

> -----Original Message-----
> From: Sebastian Gottschall <[email-masked]>
> Sent: Friday, July 24, 2020 4:36 AM
> To: Rakesh Pillai <[email-masked]>; [email-masked]
> Cc: [email-masked]; [email-masked];
> [email-masked]; [email-masked]; [email-masked];
> [email-masked]; [email-masked]; [email-masked];
> [email-masked]
> Subject: Re: [RFC 7/7] ath10k: Handle rx thread suspend and resume
> 
> your patch seem to only affect the WCN3990 chipset. all other ath10k
> supported chipset are not supported here. so you see a chance to
> implement this more generic?
> 
> Sebastian

Hi Sebastian,

A generic core for handling threads is added with this patchset.
So the handling of rx packet processing in thread can always be extended to other targets, if they wish so.

The thread related APIs are in core.c which gives all the other targets access to these APIs for using them.

Thanks,
Rakesh Pillai.

> 
> Am 21.07.2020 um 19:14 schrieb Rakesh Pillai:
> > During the system suspend or resume, the rx thread
> > also needs to be suspended or resume respectively.
> >
> > Handle the rx thread as well during the system
> > suspend and resume.
> >
> > Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.1-01040-QCAHLSWMTPLZ-1
> >
> > Signed-off-by: Rakesh Pillai <[email-masked]>
> > ---
> >   drivers/net/wireless/ath/ath10k/core.c | 23 ++++++++++++++++++
> >   drivers/net/wireless/ath/ath10k/core.h |  5 ++++
> >   drivers/net/wireless/ath/ath10k/snoc.c | 44
> +++++++++++++++++++++++++++++++++-
> >   3 files changed, 71 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/wireless/ath/ath10k/core.c
> b/drivers/net/wireless/ath/ath10k/core.c
> > index 4064fa2..b82b355 100644
> > --- a/drivers/net/wireless/ath/ath10k/core.c
> > +++ b/drivers/net/wireless/ath/ath10k/core.c
> > @@ -668,6 +668,27 @@ static unsigned int
> ath10k_core_get_fw_feature_str(char *buf,
> >   	return scnprintf(buf, buf_len, "%s",
> ath10k_core_fw_feature_str[feat]);
> >   }
> >
> > +int ath10k_core_thread_suspend(struct ath10k_thread *thread)
> > +{
> > +	ath10k_dbg(thread->ar, ATH10K_DBG_BOOT, "Suspending thread
> %s\n",
> > +		   thread->name);
> > +	set_bit(ATH10K_THREAD_EVENT_SUSPEND, thread->event_flags);
> > +	wait_for_completion(&thread->suspend);
> > +
> > +	return 0;
> > +}
> > +EXPORT_SYMBOL(ath10k_core_thread_suspend);
> > +
> > +int ath10k_core_thread_resume(struct ath10k_thread *thread)
> > +{
> > +	ath10k_dbg(thread->ar, ATH10K_DBG_BOOT, "Resuming thread
> %s\n",
> > +		   thread->name);
> > +	complete(&thread->resume);
> > +
> > +	return 0;
> > +}
> > +EXPORT_SYMBOL(ath10k_core_thread_resume);
> > +
> >   void ath10k_core_thread_post_event(struct ath10k_thread *thread,
> >   				   enum ath10k_thread_events event)
> >   {
> > @@ -700,6 +721,8 @@ int ath10k_core_thread_init(struct ath10k *ar,
> >
> >   	init_waitqueue_head(&thread->wait_q);
> >   	init_completion(&thread->shutdown);
> > +	init_completion(&thread->suspend);
> > +	init_completion(&thread->resume);
> >   	memcpy(thread->name, thread_name,
> ATH10K_THREAD_NAME_SIZE_MAX);
> >   	clear_bit(ATH10K_THREAD_EVENT_SHUTDOWN, thread-
> >event_flags);
> >   	ath10k_info(ar, "Starting thread %s\n", thread_name);
> > diff --git a/drivers/net/wireless/ath/ath10k/core.h
> b/drivers/net/wireless/ath/ath10k/core.h
> > index 596d31b..df65e75 100644
> > --- a/drivers/net/wireless/ath/ath10k/core.h
> > +++ b/drivers/net/wireless/ath/ath10k/core.h
> > @@ -976,6 +976,7 @@ enum ath10k_thread_events {
> >   	ATH10K_THREAD_EVENT_SHUTDOWN,
> >   	ATH10K_THREAD_EVENT_RX_POST,
> >   	ATH10K_THREAD_EVENT_TX_POST,
> > +	ATH10K_THREAD_EVENT_SUSPEND,
> >   	ATH10K_THREAD_EVENT_MAX,
> >   };
> >
> > @@ -983,6 +984,8 @@ struct ath10k_thread {
> >   	struct ath10k *ar;
> >   	struct task_struct *task;
> >   	struct completion shutdown;
> > +	struct completion suspend;
> > +	struct completion resume;
> >   	wait_queue_head_t wait_q;
> >   	DECLARE_BITMAP(event_flags, ATH10K_THREAD_EVENT_MAX);
> >   	char name[ATH10K_THREAD_NAME_SIZE_MAX];
> > @@ -1296,6 +1299,8 @@ static inline bool
> ath10k_peer_stats_enabled(struct ath10k *ar)
> >
> >   extern unsigned long ath10k_coredump_mask;
> >
> > +int ath10k_core_thread_suspend(struct ath10k_thread *thread);
> > +int ath10k_core_thread_resume(struct ath10k_thread *thread);
> >   void ath10k_core_thread_post_event(struct ath10k_thread *thread,
> >   				   enum ath10k_thread_events event);
> >   int ath10k_core_thread_shutdown(struct ath10k *ar,
> > diff --git a/drivers/net/wireless/ath/ath10k/snoc.c
> b/drivers/net/wireless/ath/ath10k/snoc.c
> > index 3eb5eac..a373b2b 100644
> > --- a/drivers/net/wireless/ath/ath10k/snoc.c
> > +++ b/drivers/net/wireless/ath/ath10k/snoc.c
> > @@ -932,13 +932,31 @@ int ath10k_snoc_rx_thread_loop(void *data)
> >   					    rx_thread->event_flags) ||
> >
> test_and_clear_bit(ATH10K_THREAD_EVENT_TX_POST,
> >   					    rx_thread->event_flags) ||
> > +			 test_bit(ATH10K_THREAD_EVENT_SUSPEND,
> > +				  rx_thread->event_flags) ||
> >   			 test_bit(ATH10K_THREAD_EVENT_SHUTDOWN,
> >   				  rx_thread->event_flags)));
> >
> > +		if (test_and_clear_bit(ATH10K_THREAD_EVENT_SUSPEND,
> > +				       rx_thread->event_flags)) {
> > +			complete(&rx_thread->suspend);
> > +			ath10k_info(ar, "rx thread suspend\n");
> > +			wait_for_completion(&rx_thread->resume);
> > +			ath10k_info(ar, "rx thread resume\n");
> > +		}
> > +
> >   		ath10k_htt_txrx_compl_task(ar, thread_budget);
> >   		if
> (test_and_clear_bit(ATH10K_THREAD_EVENT_SHUTDOWN,
> >   				       rx_thread->event_flags))
> >   			shutdown = true;
> > +
> > +		if (test_and_clear_bit(ATH10K_THREAD_EVENT_SUSPEND,
> > +				       rx_thread->event_flags)) {
> > +			complete(&rx_thread->suspend);
> > +			ath10k_info(ar, "rx thread suspend\n");
> > +			wait_for_completion(&rx_thread->resume);
> > +			ath10k_info(ar, "rx thread resume\n");
> > +		}
> >   	}
> >
> >   	ath10k_dbg(ar, ATH10K_DBG_SNOC, "rx thread exiting\n");
> > @@ -1133,15 +1151,30 @@ static int ath10k_snoc_hif_suspend(struct
> ath10k *ar)
> >   	if (!device_may_wakeup(ar->dev))
> >   		return -EPERM;
> >
> > +	if (ar->rx_thread_enable) {
> > +		ret = ath10k_core_thread_suspend(&ar->rx_thread);
> > +		if (ret) {
> > +			ath10k_err(ar, "failed to suspend rx_thread, %d\n",
> > +				   ret);
> > +			return ret;
> > +		}
> > +	}
> > +
> >   	ret = enable_irq_wake(ar_snoc-
> >ce_irqs[ATH10K_SNOC_WAKE_IRQ].irq_line);
> >   	if (ret) {
> >   		ath10k_err(ar, "failed to enable wakeup irq :%d\n", ret);
> > -		return ret;
> > +		goto fail;
> >   	}
> >
> >   	ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc device suspended\n");
> >
> >   	return ret;
> > +
> > +fail:
> > +	if (ar->rx_thread_enable)
> > +		ath10k_core_thread_resume(&ar->rx_thread);
> > +
> > +	return ret;
> >   }
> >
> >   static int ath10k_snoc_hif_resume(struct ath10k *ar)
> > @@ -1158,6 +1191,15 @@ static int ath10k_snoc_hif_resume(struct ath10k
> *ar)
> >   		return ret;
> >   	}
> >
> > +	if (ar->rx_thread_enable) {
> > +		ret = ath10k_core_thread_resume(&ar->rx_thread);
> > +		if (ret) {
> > +			ath10k_err(ar, "failed to suspend rx_thread, %d\n",
> > +				   ret);
> > +			return ret;
> > +		}
> > +	}
> > +
> >   	ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc device resumed\n");
> >
> >   	return ret;