[Intel-gfx] [PATCH v28 4/6] drm/i915: Add TGL+ SAGV support
Ville Syrjälä
ville.syrjala at linux.intel.com
Tue May 12 12:03:26 UTC 2020
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.
> + 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.
> + 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.
> + } 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.
> 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?
> +
> if (plane_id != PLANE_CURSOR)
> val = I915_READ(PLANE_WM_TRANS(pipe, plane_id));
> else
> --
> 2.24.1.485.gad05a3d8e5
--
Ville Syrjälä
Intel
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