[Intel-gfx] [PATCH 5/9] drm/i915: Split skl+ plane update into noarm+arm pair
Lisovskiy, Stanislav
stanislav.lisovskiy at intel.com
Wed Oct 27 17:11:37 UTC 2021
On Mon, Oct 18, 2021 at 02:50:26PM +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Chop skl_program_plane() into two halves. Fist half becomes
> the _noarm() variant, second part the _arm() variant.
>
> Fortunately I have already previously grouped the register
> writes into roughtly the correct order, so the split looks
> surprisingly clean.
>
> A few notable oddities I did not realize were self arming
> are AUX_DIST and COLOR_CTL.
>
> i915_update_info doesn't look too terrible on my cfl running
> kms_atomic_transition --r plane-all-transition --extended:
> w/o patch w/ patch
> Updates: 2178 Updates: 2018
> | |
> 1us | 1us |
> | |
> 4us | 4us |*****
> |********* |**********
> 16us |********** 16us |*******
> |*** |
> 66us | 66us |
> | |
> 262us | 262us |
> | |
> 1ms | 1ms |
> | |
> 4ms | 4ms |
> | |
> 17ms | 17ms |
> | |
> Min update: 8332ns Min update: 6164ns
> Max update: 48758ns Max update: 31808ns
> Average update: 19959ns Average update: 13159ns
> Overruns > 100us: 0 Overruns > 100us: 0
>
> And with lockdep enabled:
> w/o patch w/ patch
> Updates: 2177 Updates: 2172
> | |
> 1us | 1us |
> | |
> 4us | 4us |
> |******* |*********
> 16us |********** 16us |**********
> |******* |*
> 66us | 66us |
> | |
> 262us | 262us |
> | |
> 1ms | 1ms |
> | |
> 4ms | 4ms |
> | |
> 17ms | 17ms |
> | |
> Min update: 12645ns Min update: 9980ns
> Max update: 50153ns Max update: 33533ns
> Average update: 25337ns Average update: 18245ns
> Overruns > 250us: 0 Overruns > 250us: 0
>
> TODO: On icl+ everything seems to be armed by PLANE_SURF, so we
> can optimize this even further on modern platforms. But I
> think there's a bit of refactoring to be done first to
> figure out the best way to go about it (eg. just reusing
> the current skl+ functions, or doing a lower level split).
>
> TODO: Split scaler programming as well, but IIRC the scaler
> has some oddball double buffering behaviour on some
> platforms, so needs proper reverse engineering
>
> Cc: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
> .../drm/i915/display/skl_universal_plane.c | 113 +++++++++++-------
> 1 file changed, 72 insertions(+), 41 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
> index 74f3870d39b1..2a822e1e465e 100644
> --- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
> +++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
> @@ -1050,60 +1050,32 @@ static void icl_plane_csc_load_black(struct intel_plane *plane)
> }
>
> static void
> -skl_program_plane(struct intel_plane *plane,
> - const struct intel_crtc_state *crtc_state,
> - const struct intel_plane_state *plane_state,
> - int color_plane)
> +skl_program_plane_noarm(struct intel_plane *plane,
> + const struct intel_crtc_state *crtc_state,
> + const struct intel_plane_state *plane_state,
> + int color_plane)
> {
> struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
> enum plane_id plane_id = plane->id;
> enum pipe pipe = plane->pipe;
> - const struct drm_intel_sprite_colorkey *key = &plane_state->ckey;
> u32 stride = skl_plane_stride(plane_state, color_plane);
> const struct drm_framebuffer *fb = plane_state->hw.fb;
> - int aux_plane = skl_main_to_aux_plane(fb, color_plane);
> int crtc_x = plane_state->uapi.dst.x1;
> int crtc_y = plane_state->uapi.dst.y1;
> - u32 x = plane_state->view.color_plane[color_plane].x;
> - u32 y = plane_state->view.color_plane[color_plane].y;
> u32 src_w = drm_rect_width(&plane_state->uapi.src) >> 16;
> u32 src_h = drm_rect_height(&plane_state->uapi.src) >> 16;
> - u8 alpha = plane_state->hw.alpha >> 8;
> - u32 plane_color_ctl = 0, aux_dist = 0;
> unsigned long irqflags;
> - u32 keymsk, keymax;
> - u32 plane_ctl = plane_state->ctl;
> -
> - plane_ctl |= skl_plane_ctl_crtc(crtc_state);
> -
> - if (DISPLAY_VER(dev_priv) >= 10)
> - plane_color_ctl = plane_state->color_ctl |
> - glk_plane_color_ctl_crtc(crtc_state);
>
> /* Sizes are 0 based */
> src_w--;
> src_h--;
>
> - keymax = (key->max_value & 0xffffff) | PLANE_KEYMAX_ALPHA(alpha);
> -
> - keymsk = key->channel_mask & 0x7ffffff;
> - if (alpha < 0xff)
> - keymsk |= PLANE_KEYMSK_ALPHA_ENABLE;
> -
> /* The scaler will handle the output position */
> if (plane_state->scaler_id >= 0) {
> crtc_x = 0;
> crtc_y = 0;
> }
>
> - if (aux_plane) {
> - aux_dist = skl_surf_address(plane_state, aux_plane) -
> - skl_surf_address(plane_state, color_plane);
> -
> - if (DISPLAY_VER(dev_priv) < 12)
> - aux_dist |= skl_plane_stride(plane_state, aux_plane);
> - }
> -
> spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
>
> /*
> @@ -1119,16 +1091,10 @@ skl_program_plane(struct intel_plane *plane,
> intel_de_write_fw(dev_priv, PLANE_SIZE(pipe, plane_id),
> (src_h << 16) | src_w);
>
> - intel_de_write_fw(dev_priv, PLANE_AUX_DIST(pipe, plane_id), aux_dist);
> -
> if (icl_is_hdr_plane(dev_priv, plane_id))
> intel_de_write_fw(dev_priv, PLANE_CUS_CTL(pipe, plane_id),
> plane_state->cus_ctl);
>
> - if (DISPLAY_VER(dev_priv) >= 10)
> - intel_de_write_fw(dev_priv, PLANE_COLOR_CTL(pipe, plane_id),
> - plane_color_ctl);
> -
> if (fb->format->is_yuv && icl_is_hdr_plane(dev_priv, plane_id))
> icl_program_input_csc(plane, crtc_state, plane_state);
>
> @@ -1138,6 +1104,52 @@ skl_program_plane(struct intel_plane *plane,
>
> skl_write_plane_wm(plane, crtc_state);
>
> + intel_psr2_program_plane_sel_fetch(plane, crtc_state, plane_state, color_plane);
> +
> + spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
> +}
> +
> +static void
> +skl_program_plane_arm(struct intel_plane *plane,
> + const struct intel_crtc_state *crtc_state,
> + const struct intel_plane_state *plane_state,
> + int color_plane)
> +{
> + struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
> + enum plane_id plane_id = plane->id;
> + enum pipe pipe = plane->pipe;
> + const struct drm_intel_sprite_colorkey *key = &plane_state->ckey;
> + const struct drm_framebuffer *fb = plane_state->hw.fb;
> + int aux_plane = skl_main_to_aux_plane(fb, color_plane);
> + u32 x = plane_state->view.color_plane[color_plane].x;
> + u32 y = plane_state->view.color_plane[color_plane].y;
> + u32 keymsk, keymax, aux_dist = 0, plane_color_ctl = 0;
> + u8 alpha = plane_state->hw.alpha >> 8;
> + u32 plane_ctl = plane_state->ctl;
> + unsigned long irqflags;
> +
> + plane_ctl |= skl_plane_ctl_crtc(crtc_state);
> +
> + if (DISPLAY_VER(dev_priv) >= 10)
> + plane_color_ctl = plane_state->color_ctl |
> + glk_plane_color_ctl_crtc(crtc_state);
> +
> + keymax = (key->max_value & 0xffffff) | PLANE_KEYMAX_ALPHA(alpha);
> +
> + keymsk = key->channel_mask & 0x7ffffff;
> + if (alpha < 0xff)
> + keymsk |= PLANE_KEYMSK_ALPHA_ENABLE;
> +
> + if (aux_plane) {
> + aux_dist = skl_surf_address(plane_state, aux_plane) -
> + skl_surf_address(plane_state, color_plane);
> +
> + if (DISPLAY_VER(dev_priv) < 12)
> + aux_dist |= skl_plane_stride(plane_state, aux_plane);
> + }
> +
> + spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
> +
> intel_de_write_fw(dev_priv, PLANE_KEYVAL(pipe, plane_id),
> key->min_value);
> intel_de_write_fw(dev_priv, PLANE_KEYMSK(pipe, plane_id), keymsk);
> @@ -1146,17 +1158,22 @@ skl_program_plane(struct intel_plane *plane,
> intel_de_write_fw(dev_priv, PLANE_OFFSET(pipe, plane_id),
> (y << 16) | x);
Wondering, if we could also move PLANE_OFFSET register to non-arming
section. BSpec states, that it is not arming and being armed by
writing PLANE_SURF. I think we even agreed to check if that was true,
so I made some tests with DG2, I think and writes to PLANE_OFFSET
didn't anyhow affect the hw until PLANE_SURF was written(was checking
it by reading the crcs...)
>
> + intel_de_write_fw(dev_priv, PLANE_AUX_DIST(pipe, plane_id), aux_dist);
> +
> if (DISPLAY_VER(dev_priv) < 11)
> intel_de_write_fw(dev_priv, PLANE_AUX_OFFSET(pipe, plane_id),
> (plane_state->view.color_plane[1].y << 16) |
> plane_state->view.color_plane[1].x);
>
> - intel_psr2_program_plane_sel_fetch(plane, crtc_state, plane_state, color_plane);
> + if (DISPLAY_VER(dev_priv) >= 10)
> + intel_de_write_fw(dev_priv, PLANE_COLOR_CTL(pipe, plane_id), plane_color_ctl);
>
> /*
> * Enable the scaler before the plane so that we don't
> * get a catastrophic underrun even if the two operations
> * end up happening in two different frames.
> + *
> + * TODO: split into noarm+arm pair
> */
> if (plane_state->scaler_id >= 0)
> skl_program_plane_scaler(plane, crtc_state, plane_state);
> @@ -1199,7 +1216,20 @@ skl_plane_async_flip(struct intel_plane *plane,
> spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
> }
>
> -/* TODO: split into noarm+arm pair */
> +static void
> +skl_plane_update_noarm(struct intel_plane *plane,
> + const struct intel_crtc_state *crtc_state,
> + const struct intel_plane_state *plane_state)
> +{
> + int color_plane = 0;
> +
> + if (plane_state->planar_linked_plane && !plane_state->planar_slave)
> + /* Program the UV plane on planar master */
> + color_plane = 1;
> +
> + skl_program_plane_noarm(plane, crtc_state, plane_state, color_plane);
> +}
> +
> static void
> skl_plane_update_arm(struct intel_plane *plane,
> const struct intel_crtc_state *crtc_state,
> @@ -1211,7 +1241,7 @@ skl_plane_update_arm(struct intel_plane *plane,
> /* Program the UV plane on planar master */
> color_plane = 1;
>
> - skl_program_plane(plane, crtc_state, plane_state, color_plane);
> + skl_program_plane_arm(plane, crtc_state, plane_state, color_plane);
> }
>
> static bool intel_format_is_p01x(u32 format)
> @@ -2159,6 +2189,7 @@ skl_universal_plane_create(struct drm_i915_private *dev_priv,
> }
>
> plane->max_stride = skl_plane_max_stride;
> + plane->update_noarm = skl_plane_update_noarm;
> plane->update_arm = skl_plane_update_arm;
> plane->disable_arm = skl_plane_disable_arm;
> plane->get_hw_state = skl_plane_get_hw_state;
> --
> 2.32.0
>
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