linux-kernel - Re: [PATCH v1 2/4] remoteproc: qcom_q6v5_mss: Replace mask based tracking with size

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Message-ID: <6764de16a278f2663d1b88a40b7f662f@codeaurora.org>
Date:   Thu, 16 Jul 2020 11:24:13 -0700
From:   rishabhb@...eaurora.org
To:     Sibi Sankar <sibis@...eaurora.org>
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        bjorn.andersson@...aro.org, tsoni@...eaurora.org,
        psodagud@...eaurora.org, sidgup@...eaurora.org,
        linux-kernel-owner@...r.kernel.org,
        linux-remoteproc-owner@...r.kernel.org
Subject: Re: [PATCH v1 2/4] remoteproc: qcom_q6v5_mss: Replace mask based
 tracking with size

On 2020-07-16 01:10, Sibi Sankar wrote:
> On 2020-07-14 22:48, Mathieu Poirier wrote:
>> On Thu, Jul 09, 2020 at 01:31:54PM -0700, Rishabh Bhatnagar wrote:
>>> From: Sibi Sankar <sibis@...eaurora.org>
>>> 
>>> In order to land inline coredump support for mss, the dump_segment
>>> function would need to support granularities less than the segment
>>> size. This is achieved by replacing mask based tracking with size.
>>> 
>>> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
>>> Signed-off-by: Rishabh Bhatnagar <rishabhb@...eaurora.org>
>>> ---
>>>  drivers/remoteproc/qcom_q6v5_mss.c | 15 +++++++--------
>>>  1 file changed, 7 insertions(+), 8 deletions(-)
>>> 
>>> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c 
>>> b/drivers/remoteproc/qcom_q6v5_mss.c
>>> index feb70283b..c6ce032 100644
>>> --- a/drivers/remoteproc/qcom_q6v5_mss.c
>>> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
>>> @@ -181,8 +181,8 @@ struct q6v5 {
>>>  	bool running;
>>> 
>>>  	bool dump_mba_loaded;
>>> -	unsigned long dump_segment_mask;
>>> -	unsigned long dump_complete_mask;
>>> +	size_t current_dump_size;
>>> +	size_t total_dump_size;
>>> 
>>>  	phys_addr_t mba_phys;
>>>  	void *mba_region;
>>> @@ -1203,7 +1203,6 @@ static void qcom_q6v5_dump_segment(struct rproc 
>>> *rproc,
>>>  {
>>>  	int ret = 0;
>>>  	struct q6v5 *qproc = rproc->priv;
>>> -	unsigned long mask = BIT((unsigned long)segment->priv);
>>>  	int offset = segment->da - qproc->mpss_reloc;
>>>  	void *ptr = NULL;
>>> 
>>> @@ -1229,10 +1228,10 @@ static void qcom_q6v5_dump_segment(struct 
>>> rproc *rproc,
>>>  		memset(dest, 0xff, segment->size);
>>>  	}
>>> 
>>> -	qproc->dump_segment_mask |= mask;
>>> +	qproc->current_dump_size += segment->size;
>>> 
>>>  	/* Reclaim mba after copying segments */
>>> -	if (qproc->dump_segment_mask == qproc->dump_complete_mask) {
>>> +	if (qproc->current_dump_size == qproc->total_dump_size) {
>>>  		if (qproc->dump_mba_loaded) {
>>>  			/* Try to reset ownership back to Q6 */
>>>  			q6v5_xfer_mem_ownership(qproc, &qproc->mpss_perm,
>>> @@ -1274,7 +1273,7 @@ static int q6v5_start(struct rproc *rproc)
>>>  			"Failed to reclaim mba buffer system may become unstable\n");
>>> 
>>>  	/* Reset Dump Segment Mask */
>>> -	qproc->dump_segment_mask = 0;
>>> +	qproc->current_dump_size = 0;
>>>  	qproc->running = true;
>>> 
>>>  	return 0;
>>> @@ -1323,7 +1322,7 @@ static int 
>>> qcom_q6v5_register_dump_segments(struct rproc *rproc,
>>> 
>>>  	ehdr = (struct elf32_hdr *)fw->data;
>>>  	phdrs = (struct elf32_phdr *)(ehdr + 1);
>>> -	qproc->dump_complete_mask = 0;
>>> +	qproc->total_dump_size = 0;
>>> 
>>>  	for (i = 0; i < ehdr->e_phnum; i++) {
>>>  		phdr = &phdrs[i];
>>> @@ -1338,7 +1337,7 @@ static int 
>>> qcom_q6v5_register_dump_segments(struct rproc *rproc,
>>>  		if (ret)
>>>  			break;
>> 
>> There is also no longer a need to carry the 'i' in:
>> 
>>                 ret = rproc_coredump_add_custom_segment(rproc, 
>> phdr->p_paddr,
>>                                                         phdr->p_memsz,
>>                                                         
>> qcom_q6v5_dump_segment,
>>                                                         (void *)i);
> 
> I assume Rishabh will re-spin the
> series today and this will be taken
> care as well.
> 
Hi Sibi,
I'll respin and add the fixes.
Thanks
>>> 
>>> -		qproc->dump_complete_mask |= BIT(i);
>>> +		qproc->total_dump_size += phdr->p_memsz;
>>>  	}
>>> 
>>>  	release_firmware(fw);
>>> --
>>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora 
>>> Forum,
>>> a Linux Foundation Collaborative Project
>>>