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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 16 Jul 2020 13:40:40 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Rishabh Bhatnagar <rishabhb@...eaurora.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
Subject: Re: [PATCH v1 2/4] remoteproc: qcom_q6v5_mss: Replace mask based
 tracking with size

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.

>> 
>> -		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
>> 

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project.