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

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Message-ID: <20200714171836.GA1407705@xps15>
Date:   Tue, 14 Jul 2020 11:18:36 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Rishabh Bhatnagar <rishabhb@...eaurora.org>
Cc:     linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        bjorn.andersson@...aro.org, tsoni@...eaurora.org,
        psodagud@...eaurora.org, sidgup@...eaurora.org,
        Sibi Sankar <sibis@...eaurora.org>
Subject: Re: [PATCH v1 2/4] remoteproc: qcom_q6v5_mss: Replace mask based
 tracking with size

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);
>  
> -		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
>