linux-kernel - Re: [PATCH v3 1/1] accel/habanalabs: Switch to use %ptTs

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Message-ID: <Z-PM8oBtTPzqv-S2@smile.fi.intel.com>
Date: Wed, 26 Mar 2025 11:46:26 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Ofir Bitton <obitton@...ana.ai>, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: Oded Gabbay <ogabbay@...nel.org>,
	Jani Nikula <jani.nikula@...ux.intel.com>
Subject: Re: [PATCH v3 1/1] accel/habanalabs: Switch to use %ptTs

+Cc: Jani (sorry, forgot to add you in the first place).

Do you think it's applicable now?

On Wed, Mar 05, 2025 at 01:00:25PM +0200, Andy Shevchenko wrote:
> Use %ptTs instead of open-coded variant to print contents of time64_t type
> in human readable form.
> 
> This changes N/A output to 1970-01-01 00:00:00 for zero timestamps,
> but it's used only in the dev_err() output and won't break anything.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> 
> v3: explained the difference for N/A cases (Jani)
> v2: fixed the parameters to be the pointers
> 
>  drivers/accel/habanalabs/common/device.c | 25 +++---------------------
>  1 file changed, 3 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/accel/habanalabs/common/device.c b/drivers/accel/habanalabs/common/device.c
> index 68eebed3b050..80fa08bf57bd 100644
> --- a/drivers/accel/habanalabs/common/device.c
> +++ b/drivers/accel/habanalabs/common/device.c
> @@ -1066,28 +1066,11 @@ static bool is_pci_link_healthy(struct hl_device *hdev)
>  	return (device_id == hdev->pdev->device);
>  }
>  
> -static void stringify_time_of_last_heartbeat(struct hl_device *hdev, char *time_str, size_t size,
> -						bool is_pq_hb)
> -{
> -	time64_t seconds = is_pq_hb ? hdev->heartbeat_debug_info.last_pq_heartbeat_ts
> -					: hdev->heartbeat_debug_info.last_eq_heartbeat_ts;
> -	struct tm tm;
> -
> -	if (!seconds)
> -		return;
> -
> -	time64_to_tm(seconds, 0, &tm);
> -
> -	snprintf(time_str, size, "%ld-%02d-%02d %02d:%02d:%02d (UTC)",
> -		tm.tm_year + 1900, tm.tm_mon, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
> -}
> -
>  static bool hl_device_eq_heartbeat_received(struct hl_device *hdev)
>  {
>  	struct eq_heartbeat_debug_info *heartbeat_debug_info = &hdev->heartbeat_debug_info;
>  	u32 cpu_q_id = heartbeat_debug_info->cpu_queue_id, pq_pi_mask = (HL_QUEUE_LENGTH << 1) - 1;
>  	struct asic_fixed_properties *prop = &hdev->asic_prop;
> -	char pq_time_str[64] = "N/A", eq_time_str[64] = "N/A";
>  
>  	if (!prop->cpucp_info.eq_health_check_supported)
>  		return true;
> @@ -1095,17 +1078,15 @@ static bool hl_device_eq_heartbeat_received(struct hl_device *hdev)
>  	if (!hdev->eq_heartbeat_received) {
>  		dev_err(hdev->dev, "EQ heartbeat event was not received!\n");
>  
> -		stringify_time_of_last_heartbeat(hdev, pq_time_str, sizeof(pq_time_str), true);
> -		stringify_time_of_last_heartbeat(hdev, eq_time_str, sizeof(eq_time_str), false);
>  		dev_err(hdev->dev,
> -			"EQ: {CI %u, HB counter %u, last HB time: %s}, PQ: {PI: %u, CI: %u (%u), last HB time: %s}\n",
> +			"EQ: {CI %u, HB counter %u, last HB time: %ptTs}, PQ: {PI: %u, CI: %u (%u), last HB time: %ptTs}\n",
>  			hdev->event_queue.ci,
>  			heartbeat_debug_info->heartbeat_event_counter,
> -			eq_time_str,
> +			&hdev->heartbeat_debug_info.last_eq_heartbeat_ts,
>  			hdev->kernel_queues[cpu_q_id].pi,
>  			atomic_read(&hdev->kernel_queues[cpu_q_id].ci),
>  			atomic_read(&hdev->kernel_queues[cpu_q_id].ci) & pq_pi_mask,
> -			pq_time_str);
> +			&hdev->heartbeat_debug_info.last_pq_heartbeat_ts);
>  
>  		hl_eq_dump(hdev, &hdev->event_queue);
>  
> -- 
> 2.47.2
> 

-- 
With Best Regards,
Andy Shevchenko