[Intel-gfx] [PATCH v3 4/8] drm/i915: extract intel_bw_check_qgv_points()
Vinod Govindapillai
vinod.govindapillai at intel.com
Wed Apr 26 13:06:15 UTC 2023
Extract intel_bw_check_qgv_points() from intel_bw_atomic_check
to facilitate future platform variations in handling SAGV
configurations.
Signed-off-by: Vinod Govindapillai <vinod.govindapillai at intel.com>
---
drivers/gpu/drm/i915/display/intel_bw.c | 235 +++++++++++++-----------
1 file changed, 130 insertions(+), 105 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index f5b6cd7f83b8..a3b8512ebe8a 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -802,6 +802,128 @@ intel_atomic_get_bw_state(struct intel_atomic_state *state)
return to_intel_bw_state(bw_state);
}
+static int icl_find_qgv_points(struct drm_i915_private *i915,
+ unsigned int data_rate,
+ unsigned int num_active_planes,
+ const struct intel_bw_state *old_bw_state,
+ struct intel_bw_state *new_bw_state)
+{
+ unsigned int max_bw_point = 0;
+ unsigned int max_bw = 0;
+ unsigned int num_psf_gv_points = i915->display.bw.max[0].num_psf_gv_points;
+ unsigned int num_qgv_points = i915->display.bw.max[0].num_qgv_points;
+ u16 psf_points = 0;
+ u16 qgv_points = 0;
+ int i;
+ int ret;
+
+ ret = intel_atomic_lock_global_state(&new_bw_state->base);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < num_qgv_points; i++) {
+ unsigned int max_data_rate;
+
+ if (DISPLAY_VER(i915) > 11)
+ max_data_rate = tgl_max_bw(i915, num_active_planes, i);
+ else
+ max_data_rate = icl_max_bw(i915, num_active_planes, i);
+ /*
+ * We need to know which qgv point gives us
+ * maximum bandwidth in order to disable SAGV
+ * if we find that we exceed SAGV block time
+ * with watermarks. By that moment we already
+ * have those, as it is calculated earlier in
+ * intel_atomic_check,
+ */
+ if (max_data_rate > max_bw) {
+ max_bw_point = i;
+ max_bw = max_data_rate;
+ }
+ if (max_data_rate >= data_rate)
+ qgv_points |= BIT(i);
+
+ drm_dbg_kms(&i915->drm, "QGV point %d: max bw %d required %d\n",
+ i, max_data_rate, data_rate);
+ }
+
+ for (i = 0; i < num_psf_gv_points; i++) {
+ unsigned int max_data_rate = adl_psf_bw(i915, i);
+
+ if (max_data_rate >= data_rate)
+ psf_points |= BIT(i);
+
+ drm_dbg_kms(&i915->drm, "PSF GV point %d: max bw %d"
+ " required %d\n",
+ i, max_data_rate, data_rate);
+ }
+
+ /*
+ * BSpec states that we always should have at least one allowed point
+ * left, so if we couldn't - simply reject the configuration for obvious
+ * reasons.
+ */
+ if (qgv_points == 0) {
+ drm_dbg_kms(&i915->drm, "No QGV points provide sufficient memory"
+ " bandwidth %d for display configuration(%d active planes).\n",
+ data_rate, num_active_planes);
+ return -EINVAL;
+ }
+
+ if (num_psf_gv_points > 0 && psf_points == 0) {
+ drm_dbg_kms(&i915->drm, "No PSF GV points provide sufficient memory"
+ " bandwidth %d for display configuration(%d active planes).\n",
+ data_rate, num_active_planes);
+ return -EINVAL;
+ }
+
+ /*
+ * Leave only single point with highest bandwidth, if
+ * we can't enable SAGV due to the increased memory latency it may
+ * cause.
+ */
+ if (!intel_can_enable_sagv(i915, new_bw_state)) {
+ qgv_points = BIT(max_bw_point);
+ drm_dbg_kms(&i915->drm, "No SAGV, using single QGV point %d\n",
+ max_bw_point);
+ }
+
+ /*
+ * We store the ones which need to be masked as that is what PCode
+ * actually accepts as a parameter.
+ */
+ new_bw_state->qgv_points_mask =
+ ~(ICL_PCODE_REQ_QGV_PT(qgv_points) |
+ ADLS_PCODE_REQ_PSF_PT(psf_points)) &
+ icl_qgv_points_mask(i915);
+
+ /*
+ * If the actual mask had changed we need to make sure that
+ * the commits are serialized(in case this is a nomodeset, nonblocking)
+ */
+ if (new_bw_state->qgv_points_mask != old_bw_state->qgv_points_mask) {
+ ret = intel_atomic_serialize_global_state(&new_bw_state->base);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int intel_bw_check_qgv_points(struct drm_i915_private *i915,
+ const struct intel_bw_state *old_bw_state,
+ struct intel_bw_state *new_bw_state)
+{
+ unsigned int data_rate = intel_bw_data_rate(i915, new_bw_state);
+ unsigned int num_active_planes =
+ intel_bw_num_active_planes(i915, new_bw_state);
+
+ data_rate = DIV_ROUND_UP(data_rate, 1000);
+
+ return icl_find_qgv_points(i915, data_rate, num_active_planes,
+ old_bw_state, new_bw_state);
+}
+
static bool intel_bw_state_changed(struct drm_i915_private *i915,
const struct intel_bw_state *old_bw_state,
const struct intel_bw_state *new_bw_state)
@@ -1048,20 +1170,14 @@ static int intel_bw_check_data_rate(struct intel_atomic_state *state, bool *chan
int intel_bw_atomic_check(struct intel_atomic_state *state)
{
- struct drm_i915_private *dev_priv = to_i915(state->base.dev);
- const struct intel_bw_state *old_bw_state;
- struct intel_bw_state *new_bw_state;
- unsigned int data_rate;
- unsigned int num_active_planes;
- int i, ret;
- u16 qgv_points = 0, psf_points = 0;
- unsigned int max_bw_point = 0, max_bw = 0;
- unsigned int num_qgv_points = dev_priv->display.bw.max[0].num_qgv_points;
- unsigned int num_psf_gv_points = dev_priv->display.bw.max[0].num_psf_gv_points;
bool changed = false;
+ struct drm_i915_private *i915 = to_i915(state->base.dev);
+ struct intel_bw_state *new_bw_state;
+ const struct intel_bw_state *old_bw_state;
+ int ret;
/* FIXME earlier gens need some checks too */
- if (DISPLAY_VER(dev_priv) < 11)
+ if (DISPLAY_VER(i915) < 11)
return 0;
ret = intel_bw_check_data_rate(state, &changed);
@@ -1072,8 +1188,8 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
new_bw_state = intel_atomic_get_new_bw_state(state);
if (new_bw_state &&
- intel_can_enable_sagv(dev_priv, old_bw_state) !=
- intel_can_enable_sagv(dev_priv, new_bw_state))
+ intel_can_enable_sagv(i915, old_bw_state) !=
+ intel_can_enable_sagv(i915, new_bw_state))
changed = true;
/*
@@ -1083,101 +1199,10 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
if (!changed)
return 0;
- ret = intel_atomic_lock_global_state(&new_bw_state->base);
+ ret = intel_bw_check_qgv_points(i915, old_bw_state, new_bw_state);
if (ret)
return ret;
- data_rate = intel_bw_data_rate(dev_priv, new_bw_state);
- data_rate = DIV_ROUND_UP(data_rate, 1000);
-
- num_active_planes = intel_bw_num_active_planes(dev_priv, new_bw_state);
-
- for (i = 0; i < num_qgv_points; i++) {
- unsigned int max_data_rate;
-
- if (DISPLAY_VER(dev_priv) > 11)
- max_data_rate = tgl_max_bw(dev_priv, num_active_planes, i);
- else
- max_data_rate = icl_max_bw(dev_priv, num_active_planes, i);
- /*
- * We need to know which qgv point gives us
- * maximum bandwidth in order to disable SAGV
- * if we find that we exceed SAGV block time
- * with watermarks. By that moment we already
- * have those, as it is calculated earlier in
- * intel_atomic_check,
- */
- if (max_data_rate > max_bw) {
- max_bw_point = i;
- max_bw = max_data_rate;
- }
- if (max_data_rate >= data_rate)
- qgv_points |= BIT(i);
-
- drm_dbg_kms(&dev_priv->drm, "QGV point %d: max bw %d required %d\n",
- i, max_data_rate, data_rate);
- }
-
- for (i = 0; i < num_psf_gv_points; i++) {
- unsigned int max_data_rate = adl_psf_bw(dev_priv, i);
-
- if (max_data_rate >= data_rate)
- psf_points |= BIT(i);
-
- drm_dbg_kms(&dev_priv->drm, "PSF GV point %d: max bw %d"
- " required %d\n",
- i, max_data_rate, data_rate);
- }
-
- /*
- * BSpec states that we always should have at least one allowed point
- * left, so if we couldn't - simply reject the configuration for obvious
- * reasons.
- */
- if (qgv_points == 0) {
- drm_dbg_kms(&dev_priv->drm, "No QGV points provide sufficient memory"
- " bandwidth %d for display configuration(%d active planes).\n",
- data_rate, num_active_planes);
- return -EINVAL;
- }
-
- if (num_psf_gv_points > 0 && psf_points == 0) {
- drm_dbg_kms(&dev_priv->drm, "No PSF GV points provide sufficient memory"
- " bandwidth %d for display configuration(%d active planes).\n",
- data_rate, num_active_planes);
- return -EINVAL;
- }
-
- /*
- * Leave only single point with highest bandwidth, if
- * we can't enable SAGV due to the increased memory latency it may
- * cause.
- */
- if (!intel_can_enable_sagv(dev_priv, new_bw_state)) {
- qgv_points = BIT(max_bw_point);
- drm_dbg_kms(&dev_priv->drm, "No SAGV, using single QGV point %d\n",
- max_bw_point);
- }
-
- /*
- * We store the ones which need to be masked as that is what PCode
- * actually accepts as a parameter.
- */
- new_bw_state->qgv_points_mask =
- ~(ICL_PCODE_REQ_QGV_PT(qgv_points) |
- ADLS_PCODE_REQ_PSF_PT(psf_points)) &
- icl_qgv_points_mask(dev_priv);
-
- /*
- * If the actual mask had changed we need to make sure that
- * the commits are serialized(in case this is a nomodeset, nonblocking)
- */
- if (new_bw_state->qgv_points_mask != old_bw_state->qgv_points_mask) {
- ret = intel_atomic_serialize_global_state(&new_bw_state->base);
- if (ret)
- return ret;
- }
-
return 0;
}
--
2.34.1
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