[Intel-xe] [PATCH v3 1/2] drm/xe: Get GT clock to nanosecs

[Dixit, Ashutosh]

On Tue, 08 Aug 2023 04:54:35 -0700, Aravind Iddamsetty wrote:
>
> Helpers to get GT clock to nanosecs

Helper to convert GT clock cycles to nanoseconds.

> v2: Use DIV_ROUND_CLOSEST_ULL helper(Ashutosh)
>
> Reviewed-by: Tejas Upadhyay <tejas.upadhyay at intel.com>
> Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty at intel.com>
> ---
>  drivers/gpu/drm/xe/xe_gt_clock.c | 5 +++++
>  drivers/gpu/drm/xe/xe_gt_clock.h | 4 +++-
>  2 files changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/xe/xe_gt_clock.c b/drivers/gpu/drm/xe/xe_gt_clock.c
> index 2f77b8bbcf53..88c29ad84146 100644
> --- a/drivers/gpu/drm/xe/xe_gt_clock.c
> +++ b/drivers/gpu/drm/xe/xe_gt_clock.c
> @@ -78,3 +78,8 @@ int xe_gt_clock_init(struct xe_gt *gt)
>	gt->info.clock_freq = freq;
>	return 0;
>  }
> +
> +u64 xe_gt_clock_interval_to_ns(const struct xe_gt *gt, u64 count)

I know this name is used in i915 but my 2 cents on this is that a better
name is 'xe_gt_clock_cycles_to_ns', since count is the number of clock
cycles. So optional but you may consider this name.


> +{
> +	return DIV_ROUND_CLOSEST_ULL(count * NSEC_PER_SEC, gt->info.clock_freq);
> +}


> diff --git a/drivers/gpu/drm/xe/xe_gt_clock.h b/drivers/gpu/drm/xe/xe_gt_clock.h
> index 511923afd224..91fc9b7e83f5 100644
> --- a/drivers/gpu/drm/xe/xe_gt_clock.h
> +++ b/drivers/gpu/drm/xe/xe_gt_clock.h
> @@ -6,8 +6,10 @@
>  #ifndef _XE_GT_CLOCK_H_
>  #define _XE_GT_CLOCK_H_
>
> +#include <linux/types.h>

This is for HDRTEST I guess?

> +
>  struct xe_gt;
>
>  int xe_gt_clock_init(struct xe_gt *gt);
> -
> +u64 xe_gt_clock_interval_to_ns(const struct xe_gt *gt, u64 count);
>  #endif
> --
> 2.25.1
>

Also not sure if this merits a patch on its own so can be merged into the
giant PMU patch if you wish.

In any case, with the optional tweaks above, this is:

Reviewed-by: Ashutosh Dixit <ashutosh.dixit at intel.com>