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Subject: Re: [PATCH v5 12/15] coresight: trbe: Make sure we have enough space
To:     Suzuki K Poulose <suzuki.poulose@arm.com>, will@kernel.org,
        mathieu.poirier@linaro.org
Cc:     catalin.marinas@arm.com, mike.leach@linaro.org, leo.yan@linaro.org,
        maz@kernel.org, coresight@lists.linaro.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
References: <20211014223125.2605031-1-suzuki.poulose@arm.com>
 <20211014223125.2605031-13-suzuki.poulose@arm.com>
From:   Anshuman Khandual <anshuman.khandual@arm.com>
Message-ID: <2363663b-72b4-e249-49d1-b036866fc4fe@arm.com>
Date:   Tue, 19 Oct 2021 11:25:03 +0530
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On 10/15/21 4:01 AM, Suzuki K Poulose wrote:
> The TRBE driver makes sure that there is enough space for a meaningful
> run, otherwise pads the given space and restarts the offset calculation
> once. But there is no guarantee that we may find space or hit "no space".
> Make sure that we repeat the step until, either :
>   - We have the minimum space
>    OR
>   - There is NO space at all.
> 
> Cc: Anshuman Khandual <anshuman.khandual@arm.com>
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Cc: Leo Yan <leo.yan@linaro.org>
> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>

Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>

> ---
>  drivers/hwtracing/coresight/coresight-trbe.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
> index 4a50309a892d..5fb9f49eab33 100644
> --- a/drivers/hwtracing/coresight/coresight-trbe.c
> +++ b/drivers/hwtracing/coresight/coresight-trbe.c
> @@ -477,10 +477,14 @@ static unsigned long trbe_normal_offset(struct perf_output_handle *handle)
>  	 * If the head is too close to the limit and we don't
>  	 * have space for a meaningful run, we rather pad it
>  	 * and start fresh.
> +	 *
> +	 * We might have to do this more than once to make sure
> +	 * we have enough required space.
>  	 */
> -	if (limit && ((limit - head) < trbe_min_trace_buf_size(handle))) {
> +	while (limit && ((limit - head) < trbe_min_trace_buf_size(handle))) {
>  		trbe_pad_buf(handle, limit - head);
>  		limit = __trbe_normal_offset(handle);
> +		head = PERF_IDX2OFF(handle->head, buf);
>  	}
>  	return limit;
>  }
>