[Intel-gfx] [PATCH 2/8] drm/i915/skl+: Remove data_rate from watermark struct.
Matt Roper
matthew.d.roper at intel.com
Wed Oct 19 22:13:38 UTC 2016
On Wed, Oct 12, 2016 at 03:28:15PM +0200, Maarten Lankhorst wrote:
> It's only used in one function, and can be calculated without caching it
> in the global struct by using drm_atomic_crtc_state_for_each_plane_state.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> ---
> drivers/gpu/drm/i915/intel_drv.h | 4 ----
> drivers/gpu/drm/i915/intel_pm.c | 44 +++++++++++++++++++---------------------
> 2 files changed, 21 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index bb468c974e14..888054518f3c 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -502,10 +502,6 @@ struct intel_crtc_wm_state {
> struct skl_pipe_wm optimal;
> struct skl_ddb_entry ddb;
>
> - /* cached plane data rate */
> - unsigned plane_data_rate[I915_MAX_PLANES];
> - unsigned plane_y_data_rate[I915_MAX_PLANES];
> -
> /* minimum block allocation */
> uint16_t minimum_blocks[I915_MAX_PLANES];
> uint16_t minimum_y_blocks[I915_MAX_PLANES];
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index b96a899c899d..97b6202c4097 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3236,12 +3236,13 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate,
> * 3 * 4096 * 8192 * 4 < 2^32
> */
> static unsigned int
> -skl_get_total_relative_data_rate(struct intel_crtc_state *intel_cstate)
> +skl_get_total_relative_data_rate(struct intel_crtc_state *intel_cstate,
> + unsigned *plane_data_rate,
> + unsigned *plane_y_data_rate)
> {
> struct drm_crtc_state *cstate = &intel_cstate->base;
> struct drm_atomic_state *state = cstate->state;
> struct drm_crtc *crtc = cstate->crtc;
> - struct drm_device *dev = crtc->dev;
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> struct drm_plane *plane;
> const struct intel_plane *intel_plane;
> @@ -3263,21 +3264,16 @@ skl_get_total_relative_data_rate(struct intel_crtc_state *intel_cstate)
> /* packed/uv */
> rate = skl_plane_relative_data_rate(intel_cstate,
> pstate, 0);
> - intel_cstate->wm.skl.plane_data_rate[id] = rate;
> + plane_data_rate[id] = rate;
> +
> + total_data_rate += rate;
>
> /* y-plane */
> rate = skl_plane_relative_data_rate(intel_cstate,
> pstate, 1);
> - intel_cstate->wm.skl.plane_y_data_rate[id] = rate;
> - }
> -
> - /* Calculate CRTC's total data rate from cached values */
> - for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
> - int id = skl_wm_plane_id(intel_plane);
> + plane_y_data_rate[id] = rate;
>
> - /* packed/uv */
> - total_data_rate += intel_cstate->wm.skl.plane_data_rate[id];
> - total_data_rate += intel_cstate->wm.skl.plane_y_data_rate[id];
> + total_data_rate += rate;
> }
>
> return total_data_rate;
> @@ -3366,6 +3362,9 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
> int num_active;
> int id, i;
>
> + unsigned data_rate[I915_MAX_PLANES] = {};
> + unsigned y_data_rate[I915_MAX_PLANES] = {};
> +
Minor nitpick; if you picked a different names here (e.g.,
plane_data_rate[]) then you could leave the local variables farther down
named 'data_rate' and 'y_data_rate' which would reduce the diff changes
and result in a slightly smaller patch.
Whether or not you feel like making that change, killing the caching is
good so,
Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
> /* Clear the partitioning for disabled planes. */
> memset(ddb->plane[pipe], 0, sizeof(ddb->plane[pipe]));
> memset(ddb->y_plane[pipe], 0, sizeof(ddb->y_plane[pipe]));
> @@ -3425,29 +3424,28 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
> *
> * FIXME: we may not allocate every single block here.
> */
> - total_data_rate = skl_get_total_relative_data_rate(cstate);
> + total_data_rate = skl_get_total_relative_data_rate(cstate, data_rate, y_data_rate);
> if (total_data_rate == 0)
> return 0;
>
> start = alloc->start;
> - for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
> - unsigned int data_rate, y_data_rate;
> + for (id = 0; id < I915_MAX_PLANES; id++) {
> + unsigned rate;
> uint16_t plane_blocks, y_plane_blocks = 0;
> - int id = skl_wm_plane_id(intel_plane);
>
> - data_rate = cstate->wm.skl.plane_data_rate[id];
> + rate = data_rate[id];
>
> /*
> * allocation for (packed formats) or (uv-plane part of planar format):
> * promote the expression to 64 bits to avoid overflowing, the
> - * result is < available as data_rate / total_data_rate < 1
> + * result is < available as rate / total_data_rate < 1
> */
> plane_blocks = minimum[id];
> - plane_blocks += div_u64((uint64_t)alloc_size * data_rate,
> + plane_blocks += div_u64((uint64_t)alloc_size * rate,
> total_data_rate);
>
> /* Leave disabled planes at (0,0) */
> - if (data_rate) {
> + if (rate) {
> ddb->plane[pipe][id].start = start;
> ddb->plane[pipe][id].end = start + plane_blocks;
> }
> @@ -3457,13 +3455,13 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
> /*
> * allocation for y_plane part of planar format:
> */
> - y_data_rate = cstate->wm.skl.plane_y_data_rate[id];
> + rate = y_data_rate[id];
>
> y_plane_blocks = y_minimum[id];
> - y_plane_blocks += div_u64((uint64_t)alloc_size * y_data_rate,
> + y_plane_blocks += div_u64((uint64_t)alloc_size * rate,
> total_data_rate);
>
> - if (y_data_rate) {
> + if (rate) {
> ddb->y_plane[pipe][id].start = start;
> ddb->y_plane[pipe][id].end = start + y_plane_blocks;
> }
> --
> 2.7.4
>
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--
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
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