lmr/lmr.h

   1 /*
   2  *      The PCI Utilities -- Margining utility main header
   3  *
   4  *      Copyright (c) 2023 KNS Group LLC (YADRO)
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL v2+.
   7  *
   8  *      SPDX-License-Identifier: GPL-2.0-or-later
   9  */
  10
  11 #ifndef _LMR_H
  12 #define _LMR_H
  13
  14 #include <stdbool.h>
  15
  16 #include "pciutils.h"
  17
  18 #define MARGIN_STEP_MS 1000
  19
  20 #define MARGIN_TIM_MIN       20
  21 #define MARGIN_TIM_RECOMMEND 30
  22 #define MARGIN_VOLT_MIN      50
  23
  24 enum margin_hw { MARGIN_HW_DEFAULT, MARGIN_ICE_LAKE_RC };
  25
  26 /* PCI Device wrapper for margining functions */
  27 struct margin_dev {
  28   struct pci_dev *dev;
  29   int lmr_cap_addr;
  30   u8 width;
  31   u8 retimers_n;
  32   u8 link_speed;
  33
  34   enum margin_hw hw;
  35
  36   /* Saved Device settings to restore after margining */
  37   u8 aspm;
  38   bool hasd; // Hardware Autonomous Speed Disable
  39   bool hawd; // Hardware Autonomous Width Disable
  40 };
  41
  42 struct margin_link {
  43   struct margin_dev down_port;
  44   struct margin_dev up_port;
  45 };
  46
  47 /* Specification Revision 5.0 Table 8-11 */
  48 struct margin_params {
  49   bool ind_error_sampler;
  50   bool sample_report_method;
  51   bool ind_left_right_tim;
  52   bool ind_up_down_volt;
  53   bool volt_support;
  54
  55   u8 max_lanes;
  56
  57   u8 timing_steps;
  58   u8 timing_offset;
  59
  60   u8 volt_steps;
  61   u8 volt_offset;
  62
  63   u8 sample_rate_v;
  64   u8 sample_rate_t;
  65 };
  66
  67 /* Step Margin Execution Status - Step command response */
  68 enum margin_step_exec_sts {
  69   MARGIN_NAK = 0, // NAK/Set up for margin
  70   MARGIN_LIM,     // Too many errors (device limit)
  71   MARGIN_THR      // Test threshold has been reached
  72 };
  73
  74 enum margin_dir { VOLT_UP = 0, VOLT_DOWN, TIM_LEFT, TIM_RIGHT };
  75
  76 /* Margining results of one lane of the receiver */
  77 struct margin_res_lane {
  78   u8 lane;
  79   u8 steps[4];
  80   enum margin_step_exec_sts statuses[4];
  81 };
  82
  83 /* Reason not to run margining test on the Link/Receiver */
  84 enum margin_test_status {
  85   MARGIN_TEST_OK = 0,
  86   MARGIN_TEST_READY_BIT,
  87   MARGIN_TEST_CAPS,
  88
  89   // Couldn't run test
  90   MARGIN_TEST_PREREQS,
  91   MARGIN_TEST_ARGS_LANES,
  92   MARGIN_TEST_ARGS_RECVS,
  93   MARGIN_TEST_ASPM
  94 };
  95
  96 /* All lanes Receiver results */
  97 struct margin_results {
  98   u8 recvn; // Receiver Number
  99   struct margin_params params;
 100   bool lane_reversal;
 101   u8 link_speed;
 102
 103   enum margin_test_status test_status;
 104
 105   /* Used to convert steps to physical quantity.
 106      Calculated from MaxOffset and NumSteps     */
 107   double tim_coef;
 108   double volt_coef;
 109
 110   bool tim_off_reported;
 111   bool volt_off_reported;
 112
 113   u8 lanes_n;
 114   struct margin_res_lane *lanes;
 115 };
 116
 117 /* pcilmr arguments */
 118 struct margin_args {
 119   u8 steps_t;        // 0 == use NumTimingSteps
 120   u8 steps_v;        // 0 == use NumVoltageSteps
 121   u8 parallel_lanes; // [1; MaxLanes + 1]
 122   u8 error_limit;    // [0; 63]
 123   u8 recvs[6];       // Receivers Numbers
 124   u8 recvs_n;        // 0 == margin all available receivers
 125   u8 lanes[32];      // Lanes to Margin
 126   u8 lanes_n;        // 0 == margin all available lanes
 127   bool run_margin;   // Or print params only
 128   u8 verbosity;      // 0 - basic;
 129                      // 1 - add info about remaining time and lanes in progress during margining
 130
 131   u64 *steps_utility; // For ETA logging
 132 };
 133
 134 /* Receiver structure */
 135 struct margin_recv {
 136   struct margin_dev *dev;
 137   u8 recvn; // Receiver Number
 138   bool lane_reversal;
 139   struct margin_params *params;
 140
 141   u8 parallel_lanes;
 142   u8 error_limit;
 143 };
 144
 145 struct margin_lanes_data {
 146   struct margin_recv *recv;
 147
 148   struct margin_res_lane *results;
 149   u8 *lanes_numbers;
 150   u8 lanes_n;
 151
 152   bool ind;
 153   enum margin_dir dir;
 154
 155   u8 steps_lane_done;
 156   u8 steps_lane_total;
 157   u64 *steps_utility;
 158
 159   u8 verbosity;
 160 };
 161
 162 /* margin_hw */
 163
 164 /* Verify that devices form the link with 16 GT/s or 32 GT/s data rate */
 165 bool margin_verify_link(struct pci_dev *down_port, struct pci_dev *up_port);
 166
 167 /* Check Margining Ready bit from Margining Port Status Register */
 168 bool margin_check_ready_bit(struct pci_dev *dev);
 169
 170 /* Verify link and fill wrappers */
 171 bool margin_fill_link(struct pci_dev *down_port, struct pci_dev *up_port,
 172                       struct margin_link *wrappers);
 173
 174 /* Disable ASPM, set Hardware Autonomous Speed/Width Disable bits */
 175 bool margin_prep_link(struct margin_link *link);
 176
 177 /* Restore ASPM, Hardware Autonomous Speed/Width settings */
 178 void margin_restore_link(struct margin_link *link);
 179
 180 /* margin */
 181
 182 /* Fill margin_params without calling other functions */
 183 bool margin_read_params(struct pci_access *pacc, struct pci_dev *dev, u8 recvn,
 184                         struct margin_params *params);
 185
 186 enum margin_test_status margin_process_args(struct margin_dev *dev, struct margin_args *args);
 187
 188 /* Awaits that args are prepared through process_args.
 189    Returns number of margined Receivers through recvs_n */
 190 struct margin_results *margin_test_link(struct margin_link *link, struct margin_args *args,
 191                                         u8 *recvs_n);
 192
 193 void margin_free_results(struct margin_results *results, u8 results_n);
 194
 195 /* margin_log */
 196
 197 extern bool margin_global_logging;
 198 extern bool margin_print_domain;
 199
 200 void margin_log(char *format, ...);
 201
 202 /* b:d.f -> b:d.f */
 203 void margin_log_bdfs(struct pci_dev *down_port, struct pci_dev *up_port);
 204
 205 /* Print Link header (bdfs, width, speed) */
 206 void margin_log_link(struct margin_link *link);
 207
 208 void margin_log_params(struct margin_params *params);
 209
 210 /* Print receiver number */
 211 void margin_log_recvn(struct margin_recv *recv);
 212
 213 /* Print full info from Receiver struct */
 214 void margin_log_receiver(struct margin_recv *recv);
 215
 216 /* Margining in progress log */
 217 void margin_log_margining(struct margin_lanes_data arg);
 218
 219 void margin_log_hw_quirks(struct margin_recv *recv);
 220
 221 /* margin_results */
 222
 223 void margin_results_print_brief(struct margin_results *results, u8 recvs_n);
 224
 225 void margin_results_save_csv(struct margin_results *results, u8 recvs_n, char *dir,
 226                              struct pci_dev *up_port);
 227
 228 #endif