Quelle  dml2_policy.c   Sprache: C

/* SPDX-License-Identifier: MIT */
/*
 * Copyright 2023 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: AMD
 *
 */

#include "dml2_policy.h"

static void get_optimal_ntuple(
 const struct soc_bounding_box_st *socbb,
 struct soc_state_bounding_box_st *entry)
{
 if (entry->dcfclk_mhz > 0) {
  float bw_on_sdp = (float)(entry->dcfclk_mhz * socbb->return_bus_width_bytes * ((float)socbb->pct_ideal_sdp_bw_after_urgent / 100));

  entry->fabricclk_mhz = bw_on_sdp / (socbb->return_bus_width_bytes * ((float)socbb->pct_ideal_fabric_bw_after_urgent / 100));
  entry->dram_speed_mts = bw_on_sdp / (socbb->num_chans *
   socbb->dram_channel_width_bytes * ((float)socbb->pct_ideal_dram_bw_after_urgent_pixel_only / 100));
 } else if (entry->fabricclk_mhz > 0) {
  float bw_on_fabric = (float)(entry->fabricclk_mhz * socbb->return_bus_width_bytes * ((float)socbb->pct_ideal_fabric_bw_after_urgent / 100));

  entry->dcfclk_mhz = bw_on_fabric / (socbb->return_bus_width_bytes * ((float)socbb->pct_ideal_sdp_bw_after_urgent / 100));
  entry->dram_speed_mts = bw_on_fabric / (socbb->num_chans *
   socbb->dram_channel_width_bytes * ((float)socbb->pct_ideal_dram_bw_after_urgent_pixel_only / 100));
 } else if (entry->dram_speed_mts > 0) {
  float bw_on_dram = (float)(entry->dram_speed_mts * socbb->num_chans *
   socbb->dram_channel_width_bytes * ((float)socbb->pct_ideal_dram_bw_after_urgent_pixel_only / 100));

  entry->fabricclk_mhz = bw_on_dram / (socbb->return_bus_width_bytes * ((float)socbb->pct_ideal_fabric_bw_after_urgent / 100));
  entry->dcfclk_mhz = bw_on_dram / (socbb->return_bus_width_bytes * ((float)socbb->pct_ideal_sdp_bw_after_urgent / 100));
 }
}

static float calculate_net_bw_in_mbytes_sec(const struct soc_bounding_box_st *socbb,
 struct soc_state_bounding_box_st *entry)
{
 float memory_bw_mbytes_sec = (float)(entry->dram_speed_mts *  socbb->num_chans *
  socbb->dram_channel_width_bytes * ((float)socbb->pct_ideal_dram_bw_after_urgent_pixel_only / 100));

 float fabric_bw_mbytes_sec = (float)(entry->fabricclk_mhz * socbb->return_bus_width_bytes * ((float)socbb->pct_ideal_fabric_bw_after_urgent / 100));

 float sdp_bw_mbytes_sec = (float)(entry->dcfclk_mhz * socbb->return_bus_width_bytes * ((float)socbb->pct_ideal_sdp_bw_after_urgent / 100));

 float limiting_bw_mbytes_sec = memory_bw_mbytes_sec;

 if (fabric_bw_mbytes_sec < limiting_bw_mbytes_sec)
  limiting_bw_mbytes_sec = fabric_bw_mbytes_sec;

 if (sdp_bw_mbytes_sec < limiting_bw_mbytes_sec)
  limiting_bw_mbytes_sec = sdp_bw_mbytes_sec;

 return limiting_bw_mbytes_sec;
}

static void insert_entry_into_table_sorted(const struct soc_bounding_box_st *socbb,
 struct soc_states_st *table,
 struct soc_state_bounding_box_st *entry)
{
 int index = 0;
 int i = 0;
 float net_bw_of_new_state = 0;

 get_optimal_ntuple(socbb, entry);

 if (table->num_states == 0) {
  index = 0;
 } else {
  net_bw_of_new_state = calculate_net_bw_in_mbytes_sec(socbb, entry);
  while (net_bw_of_new_state > calculate_net_bw_in_mbytes_sec(socbb, &table->state_array[index])) {
   index++;
   if (index >= (int) table->num_states)
    break;
  }

  for (i = table->num_states; i > index; i--) {
   table->state_array[i] = table->state_array[i - 1];
  }
  //ASSERT(index < MAX_CLK_TABLE_SIZE);
 }

 table->state_array[index] = *entry;
 table->state_array[index].dcfclk_mhz = (int)entry->dcfclk_mhz;
 table->state_array[index].fabricclk_mhz = (int)entry->fabricclk_mhz;
 table->state_array[index].dram_speed_mts = (int)entry->dram_speed_mts;
 table->num_states++;
}

static void remove_entry_from_table_at_index(struct soc_states_st *table,
 unsigned int index)
{
 int i;

 if (table->num_states == 0)
  return;

 for (i = index; i < (int) table->num_states - 1; i++) {
  table->state_array[i] = table->state_array[i + 1];
 }
 memset(&table->state_array[--table->num_states], 0, sizeof(struct soc_state_bounding_box_st));
}

int dml2_policy_build_synthetic_soc_states(struct dml2_policy_build_synthetic_soc_states_scratch *s,
 struct dml2_policy_build_synthetic_soc_states_params *p)
{
 int i, j;
 unsigned int min_fclk_mhz = p->in_states->state_array[0].fabricclk_mhz;
 unsigned int min_dcfclk_mhz = p->in_states->state_array[0].dcfclk_mhz;
 unsigned int min_socclk_mhz = p->in_states->state_array[0].socclk_mhz;

 int max_dcfclk_mhz = 0, max_dispclk_mhz = 0, max_dppclk_mhz = 0,
  max_phyclk_mhz = 0, max_dtbclk_mhz = 0, max_fclk_mhz = 0,
  max_uclk_mhz = 0, max_socclk_mhz = 0;

 int num_uclk_dpms = 0, num_fclk_dpms = 0;

 for (i = 0; i < __DML_MAX_STATE_ARRAY_SIZE__; i++) {
  if (p->in_states->state_array[i].dcfclk_mhz > max_dcfclk_mhz)
   max_dcfclk_mhz = (int) p->in_states->state_array[i].dcfclk_mhz;
  if (p->in_states->state_array[i].fabricclk_mhz > max_fclk_mhz)
   max_fclk_mhz = (int) p->in_states->state_array[i].fabricclk_mhz;
  if (p->in_states->state_array[i].socclk_mhz > max_socclk_mhz)
   max_socclk_mhz = (int) p->in_states->state_array[i].socclk_mhz;
  if (p->in_states->state_array[i].dram_speed_mts > max_uclk_mhz)
   max_uclk_mhz = (int) p->in_states->state_array[i].dram_speed_mts;
  if (p->in_states->state_array[i].dispclk_mhz > max_dispclk_mhz)
   max_dispclk_mhz = (int) p->in_states->state_array[i].dispclk_mhz;
  if (p->in_states->state_array[i].dppclk_mhz > max_dppclk_mhz)
   max_dppclk_mhz = (int) p->in_states->state_array[i].dppclk_mhz;
  if (p->in_states->state_array[i].phyclk_mhz > max_phyclk_mhz)
   max_phyclk_mhz = (int)p->in_states->state_array[i].phyclk_mhz;
  if (p->in_states->state_array[i].dtbclk_mhz > max_dtbclk_mhz)
   max_dtbclk_mhz = (int)p->in_states->state_array[i].dtbclk_mhz;

  if (p->in_states->state_array[i].fabricclk_mhz > 0)
   num_fclk_dpms++;
  if (p->in_states->state_array[i].dram_speed_mts > 0)
   num_uclk_dpms++;
 }

 if (!max_dcfclk_mhz || !max_dispclk_mhz || !max_dppclk_mhz || !max_phyclk_mhz || !max_dtbclk_mhz)
  return -1;

 p->out_states->num_states = 0;

 s->entry = p->in_states->state_array[0];

 s->entry.dispclk_mhz = max_dispclk_mhz;
 s->entry.dppclk_mhz = max_dppclk_mhz;
 s->entry.dtbclk_mhz = max_dtbclk_mhz;
 s->entry.phyclk_mhz = max_phyclk_mhz;

 s->entry.dscclk_mhz = max_dispclk_mhz / 3;
 s->entry.phyclk_mhz = max_phyclk_mhz;
 s->entry.dtbclk_mhz = max_dtbclk_mhz;

 // Insert all the DCFCLK STAs first
 for (i = 0; i < p->num_dcfclk_stas; i++) {
  s->entry.dcfclk_mhz = p->dcfclk_stas_mhz[i];
  s->entry.fabricclk_mhz = 0;
  s->entry.dram_speed_mts = 0;
  if (i > 0)
   s->entry.socclk_mhz = max_socclk_mhz;

  insert_entry_into_table_sorted(p->in_bbox, p->out_states, &s->entry);
 }

 // Insert the UCLK DPMS
 for (i = 0; i < num_uclk_dpms; i++) {
  s->entry.dcfclk_mhz = 0;
  s->entry.fabricclk_mhz = 0;
  s->entry.dram_speed_mts = p->in_states->state_array[i].dram_speed_mts;
  if (i == 0) {
   s->entry.socclk_mhz = min_socclk_mhz;
  } else {
   s->entry.socclk_mhz = max_socclk_mhz;
  }

  insert_entry_into_table_sorted(p->in_bbox, p->out_states, &s->entry);
 }

 // Insert FCLK DPMs (if present)
 if (num_fclk_dpms > 2) {
  for (i = 0; i < num_fclk_dpms; i++) {
   s->entry.dcfclk_mhz = 0;
   s->entry.fabricclk_mhz = p->in_states->state_array[i].fabricclk_mhz;
   s->entry.dram_speed_mts = 0;

  insert_entry_into_table_sorted(p->in_bbox, p->out_states, &s->entry);
  }
 }
 // Add max FCLK
 else {
  s->entry.dcfclk_mhz = 0;
  s->entry.fabricclk_mhz = p->in_states->state_array[num_fclk_dpms - 1].fabricclk_mhz;
  s->entry.dram_speed_mts = 0;

  insert_entry_into_table_sorted(p->in_bbox, p->out_states, &s->entry);
 }

 // Remove states that require higher clocks than are supported
 for (i = p->out_states->num_states - 1; i >= 0; i--) {
  if (p->out_states->state_array[i].dcfclk_mhz > max_dcfclk_mhz ||
   p->out_states->state_array[i].fabricclk_mhz > max_fclk_mhz ||
   p->out_states->state_array[i].dram_speed_mts > max_uclk_mhz)
   remove_entry_from_table_at_index(p->out_states, i);
 }

 // At this point, the table contains all "points of interest" based on
 // DPMs from PMFW, and STAs. Table is sorted by BW, and all clock
 // ratios (by derate, are exact).

 // Round up UCLK to DPMs
 for (i = p->out_states->num_states - 1; i >= 0; i--) {
  for (j = 0; j < num_uclk_dpms; j++) {
   if (p->in_states->state_array[j].dram_speed_mts >= p->out_states->state_array[i].dram_speed_mts) {
    p->out_states->state_array[i].dram_speed_mts = p->in_states->state_array[j].dram_speed_mts;
    break;
   }
  }
 }

 // If FCLK is coarse grained, round up to next DPMs
 if (num_fclk_dpms > 2) {
  for (i = p->out_states->num_states - 1; i >= 0; i--) {
   for (j = 0; j < num_fclk_dpms; j++) {
    if (p->in_states->state_array[j].fabricclk_mhz >= p->out_states->state_array[i].fabricclk_mhz) {
     p->out_states->state_array[i].fabricclk_mhz = p->in_states->state_array[j].fabricclk_mhz;
     break;
    }
   }
  }
 }

 // Clamp to min FCLK/DCFCLK
 for (i = p->out_states->num_states - 1; i >= 0; i--) {
  if (p->out_states->state_array[i].fabricclk_mhz < min_fclk_mhz) {
   p->out_states->state_array[i].fabricclk_mhz = min_fclk_mhz;
  }
  if (p->out_states->state_array[i].dcfclk_mhz < min_dcfclk_mhz) {
   p->out_states->state_array[i].dcfclk_mhz = min_dcfclk_mhz;
  }
 }

 // Remove duplicate states, note duplicate states are always neighbouring since table is sorted.
 i = 0;
 while (i < (int) p->out_states->num_states - 1) {
  if (p->out_states->state_array[i].dcfclk_mhz == p->out_states->state_array[i + 1].dcfclk_mhz &&
   p->out_states->state_array[i].fabricclk_mhz == p->out_states->state_array[i + 1].fabricclk_mhz &&
   p->out_states->state_array[i].dram_speed_mts == p->out_states->state_array[i + 1].dram_speed_mts)
   remove_entry_from_table_at_index(p->out_states, i);
 else
  i++;
 }

 return 0;
}

void build_unoptimized_policy_settings(enum dml_project_id project, struct dml_mode_eval_policy_st *policy)
{
 for (int i = 0; i < __DML_NUM_PLANES__; i++) {
  policy->MPCCombineUse[i] = dml_mpc_as_needed_for_voltage; // TOREVIEW: Is this still needed?  When is MPCC useful for pstate given CRB?
  policy->ODMUse[i] = dml_odm_use_policy_combine_as_needed;
  policy->ImmediateFlipRequirement[i] = dml_immediate_flip_required;
  policy->AllowForPStateChangeOrStutterInVBlank[i] = dml_prefetch_support_uclk_fclk_and_stutter_if_possible;
 }

 /* Change the default policy initializations as per spreadsheet. We might need to
 * review and change them later on as per Jun's earlier comments.
 */
 policy->UseUnboundedRequesting = dml_unbounded_requesting_enable;
 policy->UseMinimumRequiredDCFCLK = false;
 policy->DRAMClockChangeRequirementFinal = true; // TOREVIEW: What does this mean?
 policy->FCLKChangeRequirementFinal = true; // TOREVIEW: What does this mean?
 policy->USRRetrainingRequiredFinal = true;
 policy->EnhancedPrefetchScheduleAccelerationFinal = true; // TOREVIEW: What does this mean?
 policy->NomDETInKByteOverrideEnable = false;
 policy->NomDETInKByteOverrideValue = 0;
 policy->DCCProgrammingAssumesScanDirectionUnknownFinal = true;
 policy->SynchronizeTimingsFinal = true;
 policy->SynchronizeDRRDisplaysForUCLKPStateChangeFinal = true;
 policy->AssumeModeSupportAtMaxPwrStateEvenDRAMClockChangeNotSupported = true; // TOREVIEW: What does this mean?
 policy->AssumeModeSupportAtMaxPwrStateEvenFClockChangeNotSupported = true; // TOREVIEW: What does this mean?
 if (project == dml_project_dcn35 ||
  project == dml_project_dcn36 ||
  project == dml_project_dcn351) {
  policy->DCCProgrammingAssumesScanDirectionUnknownFinal = false;
  policy->EnhancedPrefetchScheduleAccelerationFinal = 0;
  policy->AllowForPStateChangeOrStutterInVBlankFinal = dml_prefetch_support_uclk_fclk_and_stutter_if_possible; /*new*/
  policy->UseOnlyMaxPrefetchModes = 1;
 }
}