[Intel-gfx] [PATCH v28 4/6] drm/i915: Add TGL+ SAGV support
Lisovskiy, Stanislav
stanislav.lisovskiy at intel.com
Tue May 12 13:17:34 UTC 2020
On Tue, May 12, 2020 at 04:10:46PM +0300, Ville Syrjälä wrote:
> On Tue, May 12, 2020 at 03:52:27PM +0300, Lisovskiy, Stanislav wrote:
> > On Tue, May 12, 2020 at 03:03:26PM +0300, Ville Syrjälä wrote:
> > > On Thu, May 07, 2020 at 05:45:01PM +0300, Stanislav Lisovskiy wrote:
> > > > Starting from TGL we need to have a separate wm0
> > > > values for SAGV and non-SAGV which affects
> > > > how calculations are done.
> > > >
> > > > v2: Remove long lines
> > > > v3: Removed COLOR_PLANE enum references
> > > > v4, v5, v6: Fixed rebase conflict
> > > > v7: - Removed skl_plane_wm_level accessor from skl_allocate_pipe_ddb(Ville)
> > > > - Removed sagv_uv_wm0(Ville)
> > > > - can_sagv->use_sagv_wm(Ville)
> > > >
> > > > Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
> > > > ---
> > > > drivers/gpu/drm/i915/display/intel_display.c | 8 +-
> > > > .../drm/i915/display/intel_display_types.h | 2 +
> > > > drivers/gpu/drm/i915/intel_pm.c | 118 +++++++++++++++++-
> > > > 3 files changed, 121 insertions(+), 7 deletions(-)
> > > >
> > > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> > > > index fd6d63b03489..be5741cb7595 100644
> > > > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > > > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > > > @@ -13961,7 +13961,9 @@ static void verify_wm_state(struct intel_crtc *crtc,
> > > > /* Watermarks */
> > > > for (level = 0; level <= max_level; level++) {
> > > > if (skl_wm_level_equals(&hw_plane_wm->wm[level],
> > > > - &sw_plane_wm->wm[level]))
> > > > + &sw_plane_wm->wm[level]) ||
> > > > + (level == 0 && skl_wm_level_equals(&hw_plane_wm->wm[level],
> > > > + &sw_plane_wm->sagv_wm0)))
> > > > continue;
> > > >
> > > > drm_err(&dev_priv->drm,
> > > > @@ -14016,7 +14018,9 @@ static void verify_wm_state(struct intel_crtc *crtc,
> > > > /* Watermarks */
> > > > for (level = 0; level <= max_level; level++) {
> > > > if (skl_wm_level_equals(&hw_plane_wm->wm[level],
> > > > - &sw_plane_wm->wm[level]))
> > > > + &sw_plane_wm->wm[level]) ||
> > > > + (level == 0 && skl_wm_level_equals(&hw_plane_wm->wm[level],
> > > > + &sw_plane_wm->sagv_wm0)))
> > > > continue;
> > > >
> > > > drm_err(&dev_priv->drm,
> > > > diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> > > > index 9488449e4b94..8cede29c9562 100644
> > > > --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> > > > +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> > > > @@ -688,11 +688,13 @@ struct skl_plane_wm {
> > > > struct skl_wm_level wm[8];
> > > > struct skl_wm_level uv_wm[8];
> > > > struct skl_wm_level trans_wm;
> > > > + struct skl_wm_level sagv_wm0;
> > > > bool is_planar;
> > > > };
> > > >
> > > > struct skl_pipe_wm {
> > > > struct skl_plane_wm planes[I915_MAX_PLANES];
> > > > + bool use_sagv_wm;
> > > > };
> > > >
> > > > enum vlv_wm_level {
> > > > diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> > > > index db188efee21e..934a686342ad 100644
> > > > --- a/drivers/gpu/drm/i915/intel_pm.c
> > > > +++ b/drivers/gpu/drm/i915/intel_pm.c
> > > > @@ -3863,25 +3863,35 @@ bool intel_can_enable_sagv(struct drm_i915_private *dev_priv,
> > > > return bw_state->pipe_sagv_reject == 0;
> > > > }
> > > >
> > > > +static bool
> > > > +tgl_crtc_can_enable_sagv(const struct intel_crtc_state *crtc_state);
> > >
> > > Just put the function here instead of adding fwd decalrations.
> > >
> > > > +
> > > > static int intel_compute_sagv_mask(struct intel_atomic_state *state)
> > > > {
> > > > struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> > > > int ret;
> > > > struct intel_crtc *crtc;
> > > > - const struct intel_crtc_state *new_crtc_state;
> > > > + struct intel_crtc_state *new_crtc_state;
> > > > struct intel_bw_state *new_bw_state = NULL;
> > > > const struct intel_bw_state *old_bw_state = NULL;
> > > > int i;
> > > >
> > > > for_each_new_intel_crtc_in_state(state, crtc,
> > > > new_crtc_state, i) {
> > > > + bool can_sagv;
> > > > +
> > > > new_bw_state = intel_atomic_get_bw_state(state);
> > > > if (IS_ERR(new_bw_state))
> > > > return PTR_ERR(new_bw_state);
> > > >
> > > > old_bw_state = intel_atomic_get_old_bw_state(state);
> > > >
> > > > - if (skl_crtc_can_enable_sagv(new_crtc_state))
> > > > + if (INTEL_GEN(dev_priv) >= 12)
> > > > + can_sagv = tgl_crtc_can_enable_sagv(new_crtc_state);
> > > > + else
> > > > + can_sagv = skl_crtc_can_enable_sagv(new_crtc_state);
> > > > +
> > > > + if (can_sagv)
> > > > new_bw_state->pipe_sagv_reject &= ~BIT(crtc->pipe);
> > > > else
> > > > new_bw_state->pipe_sagv_reject |= BIT(crtc->pipe);
> > > > @@ -3899,6 +3909,24 @@ static int intel_compute_sagv_mask(struct intel_atomic_state *state)
> > > > return ret;
> > > > }
> > > >
> > > > + for_each_new_intel_crtc_in_state(state, crtc,
> > > > + new_crtc_state, i) {
> > > > + struct skl_pipe_wm *pipe_wm = &new_crtc_state->wm.skl.optimal;
> > > > +
> > > > + /*
> > > > + * Due to drm limitation at commit state, when
> > > > + * changes are written the whole atomic state is
> > > > + * zeroed away => which prevents from using it,
> > > > + * so just sticking it into pipe wm state for
> > > > + * keeping it simple - anyway this is related to wm.
> > > > + * Proper way in ideal universe would be of course not
> > > > + * to lose parent atomic state object from child crtc_state,
> > > > + * and stick to OOP programming principles, which had been
> > > > + * scientifically proven to work.
> > > > + */
> > >
> > > More ramblings. Just drop this comment too imo.
> >
> > As I understand what is happening here is rather weird, so I thought
> > commenting is good idea.
>
> At least I have no idea what the comment is trying to say.
> I see nothing weird hapening here, we're just computing the
> state which is totally standard stuff.
Well I can remind, this is because there is no way to get parent state
from crtc_state, because of weird drm atomic behaviour which leaves us
with NULL parent state. So that we had to stick this boolean to some
place.
In normal code universe this wouldn't even be needed if we could
just get atomic state from crtc_state when we write wm in skl_write_plane_wm.
However probably OOP principles like parent-child hieararchy is not a thing
here. That what this comment was trying to say.
In normal OOP you can't destroy parent object _before_ destroying
child one.
Stan
>
> >
> > >
> > > > + pipe_wm->use_sagv_wm = intel_can_enable_sagv(dev_priv, new_bw_state);
> > >
> > > I think this should be
> > > gen >= 12 && intel_can_enable_sagv();
> > >
> > > > + }
> > > > +
> > > > if (intel_can_enable_sagv(dev_priv, new_bw_state) != intel_can_enable_sagv(dev_priv, old_bw_state)) {
> > > > ret = intel_atomic_serialize_global_state(&new_bw_state->base);
> > > > if (ret)
> > > > @@ -4642,12 +4670,39 @@ skl_plane_wm_level(const struct intel_crtc_state *crtc_state,
> > > > int level,
> > > > int color_plane)
> > > > {
> > > > - const struct skl_plane_wm *wm =
> > > > - &crtc_state->wm.skl.optimal.planes[plane_id];
> > > > + const struct skl_pipe_wm *pipe_wm = &crtc_state->wm.skl.optimal;
> > > > + const struct skl_plane_wm *wm = &pipe_wm->planes[plane_id];
> > > > +
> > > > + if (!level) {
> > > > + if (pipe_wm->use_sagv_wm)
> > > > + return &wm->sagv_wm0;
> > > > + }
> > >
> > > if (level == 0 && use_sagv_wm)
> > > return sagv_wm0;
> > >
> > > >
> > > > return color_plane == 0 ? &wm->wm[level] : &wm->uv_wm[level];
> > > > }
> > > >
> > > > +static bool
> > > > +tgl_crtc_can_enable_sagv(const struct intel_crtc_state *crtc_state)
> > > > +{
> > > > + struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> > > > + enum plane_id plane_id;
> > > > +
> > > > + if (!crtc_state->hw.active)
> > > > + return true;
> > > > +
> > > > + for_each_plane_id_on_crtc(crtc, plane_id) {
> > > > + const struct skl_ddb_entry *plane_alloc =
> > > > + &crtc_state->wm.skl.plane_ddb_y[plane_id];
> > > > + const struct skl_plane_wm *wm =
> > > > + &crtc_state->wm.skl.optimal.planes[plane_id];
> > > > +
> > > > + if (skl_ddb_entry_size(plane_alloc) < wm->sagv_wm0.min_ddb_alloc)
> > > > + return false;
> > > > + }
> > > > +
> > > > + return true;
> > > > +}
> > > > +
> > > > static int
> > > > skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state)
> > > > {
> > > > @@ -4684,7 +4739,6 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state)
> > > > plane_data_rate,
> > > > uv_plane_data_rate);
> > > >
> > > > -
> > > > skl_ddb_get_pipe_allocation_limits(dev_priv, crtc_state, total_data_rate,
> > > > alloc, &num_active);
> > > > alloc_size = skl_ddb_entry_size(alloc);
> > > > @@ -5219,6 +5273,37 @@ skl_compute_wm_levels(const struct intel_crtc_state *crtc_state,
> > > > }
> > > > }
> > > >
> > > > +static void tgl_compute_sagv_wm(const struct intel_crtc_state *crtc_state,
> > > > + const struct skl_wm_params *wm_params,
> > > > + struct skl_plane_wm *plane_wm)
> > > > +{
> > > > + struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
> > > > + struct skl_wm_level *sagv_wm = &plane_wm->sagv_wm0;
> > > > + struct skl_wm_level *levels = plane_wm->wm;
> > > > +
> > > > + /*
> > > > + * For Gen12 if it is an L0 we need to also
> > > > + * consider sagv_block_time when calculating
> > > > + * L0 watermark - we will need that when making
> > > > + * a decision whether enable SAGV or not.
> > > > + * For older gens we agreed to copy L0 value for
> > > > + * compatibility.
> > > > + */
> > > > + if ((INTEL_GEN(dev_priv) >= 12)) {
> > >
> > > Drop this if-else and only call tgl_compute_sagv_wm() on tgl+.
> > > The comment can then go as well I think.
> >
> > We actually had _agreed_ with you personally that I do copy
> > wm0 values for other platforms for compatibility reasons.
> > Now after one month you say that we are going to call this
> > only for gen12.
>
> I see no point in having this populated for pre-tgl.
>
> >
> > >
> > > > + u32 latency = dev_priv->wm.skl_latency[0];
> > > > +
> > > > + latency += dev_priv->sagv_block_time_us;
> > > > + skl_compute_plane_wm(crtc_state, 0, latency,
> > > > + wm_params, &levels[0],
> > > > + sagv_wm);
> > > > + DRM_DEBUG_KMS("%d L0 blocks required for SAGV vs %d for non-SAGV\n",
> > > > + sagv_wm->min_ddb_alloc, levels[0].min_ddb_alloc);
> > >
> > > Leftover debugs. Pls remove.
> >
> > I thought this might be useful, we should have some understanding what
> > is happening, i.e what was the reasoning and why SAGV was switched on/off.
> > Not crucial, but really don't understand why this is _that_ harmful.
> > We have plenty of wm/ddb debugs anyway, but no way to figure out how SAGV logic is working.
>
> If we need more debugs they need to added carefully so as to not totally
> blow up the logs. I think this here would spam the logs heavily.
>
> >
> > >
> > > > + } else {
> > > > + /* Since all members are POD */
> > > > + *sagv_wm = levels[0];
> > > > + }
> > > > +}
> > > > +
> > > > static void skl_compute_transition_wm(const struct intel_crtc_state *crtc_state,
> > > > const struct skl_wm_params *wp,
> > > > struct skl_plane_wm *wm)
> > > > @@ -5296,6 +5381,8 @@ static int skl_build_plane_wm_single(struct intel_crtc_state *crtc_state,
> > > > return ret;
> > > >
> > > > skl_compute_wm_levels(crtc_state, &wm_params, wm->wm);
> > > > + if (color_plane == 0)
> > >
> > > We do want this for both the Y plane and UV plane.
> > >
> > > > + tgl_compute_sagv_wm(crtc_state, &wm_params, wm);
> > > > skl_compute_transition_wm(crtc_state, &wm_params, wm);
> > > >
> > > > return 0;
> > > > @@ -5702,6 +5789,12 @@ skl_print_wm_changes(struct intel_atomic_state *state)
> > > > enast(new_wm->wm[7].ignore_lines), new_wm->wm[7].plane_res_l,
> > > > enast(new_wm->trans_wm.ignore_lines), new_wm->trans_wm.plane_res_l);
> > > >
> > > > + drm_dbg_kms(&dev_priv->drm,
> > > > + "[PLANE:%d:%s] sagv wm0 lines %4d -> %4d\n",
> > > > + plane->base.base.id, plane->base.name,
> > > > + old_wm->sagv_wm0.plane_res_l,
> > > > + new_wm->sagv_wm0.plane_res_l);
> > > > +
> > >
> > > IIRC I already suggested just slapping these onto the existing debug
> > > prints instead of bloating the debug output with extra lines.
> > >
> > > Ie instead of
> > > wms ... -> ...
> > > sagv wm ... -> ...
> > >
> > > we just get
> > > wms ...,old_sagv_wm0 -> ...,new_sagv_wm0
> > >
> > > just like we already do for eg. the transition wm.
> >
> > Not sure about this one. I will check, I thought you suggested the opposite,
> > i.e do those debugs separately.
> >
> > Stan
> > >
> > > > drm_dbg_kms(&dev_priv->drm,
> > > > "[PLANE:%d:%s] blocks %4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d"
> > > > " -> %4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d\n",
> > > > @@ -5717,6 +5810,12 @@ skl_print_wm_changes(struct intel_atomic_state *state)
> > > > new_wm->wm[6].plane_res_b, new_wm->wm[7].plane_res_b,
> > > > new_wm->trans_wm.plane_res_b);
> > > >
> > > > + drm_dbg_kms(&dev_priv->drm,
> > > > + "[PLANE:%d:%s] sagv wm0 blocks %4d -> %4d\n",
> > > > + plane->base.base.id, plane->base.name,
> > > > + old_wm->sagv_wm0.plane_res_b,
> > > > + new_wm->sagv_wm0.plane_res_b);
> > > > +
> > > > drm_dbg_kms(&dev_priv->drm,
> > > > "[PLANE:%d:%s] min_ddb %4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d"
> > > > " -> %4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d\n",
> > > > @@ -5731,6 +5830,12 @@ skl_print_wm_changes(struct intel_atomic_state *state)
> > > > new_wm->wm[4].min_ddb_alloc, new_wm->wm[5].min_ddb_alloc,
> > > > new_wm->wm[6].min_ddb_alloc, new_wm->wm[7].min_ddb_alloc,
> > > > new_wm->trans_wm.min_ddb_alloc);
> > > > +
> > > > + drm_dbg_kms(&dev_priv->drm,
> > > > + "[PLANE:%d:%s] sagv wm0 min ddb %4d -> %4d\n",
> > > > + plane->base.base.id, plane->base.name,
> > > > + old_wm->sagv_wm0.min_ddb_alloc,
> > > > + new_wm->sagv_wm0.min_ddb_alloc);
> > > > }
> > > > }
> > > > }
> > > > @@ -6023,6 +6128,9 @@ void skl_pipe_wm_get_hw_state(struct intel_crtc *crtc,
> > > > skl_wm_level_from_reg_val(val, &wm->wm[level]);
> > > > }
> > > >
> > > > + memcpy(&wm->sagv_wm0, &wm->wm[0],
> > > > + sizeof(struct skl_wm_level));
> > >
> > > A simple assignment should suffice?
> >
> > Agree.
> >
> > >
> > > > +
> > > > if (plane_id != PLANE_CURSOR)
> > > > val = I915_READ(PLANE_WM_TRANS(pipe, plane_id));
> > > > else
> > > > --
> > > > 2.24.1.485.gad05a3d8e5
> > >
> > > --
> > > Ville Syrjälä
> > > Intel
>
> --
> Ville Syrjälä
> Intel
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