2 * The PCI Utilities -- Margining utility main header
4 * Copyright (c) 2023 KNS Group LLC (YADRO)
6 * Can be freely distributed and used under the terms of the GNU GPL v2+.
8 * SPDX-License-Identifier: GPL-2.0-or-later
18 #define MARGIN_STEP_MS 1000
20 #define MARGIN_TIM_MIN 20
21 #define MARGIN_TIM_RECOMMEND 30
22 #define MARGIN_VOLT_MIN 50
24 /* PCI Device wrapper for margining functions */
32 /* Saved Device settings to restore after margining */
34 bool hasd; // Hardware Autonomous Speed Disable
35 bool hawd; // Hardware Autonomous Width Disable
39 struct margin_dev down_port;
40 struct margin_dev up_port;
43 /* Specification Revision 5.0 Table 8-11 */
44 struct margin_params {
45 bool ind_error_sampler;
46 bool sample_report_method;
47 bool ind_left_right_tim;
48 bool ind_up_down_volt;
63 /* Step Margin Execution Status - Step command response */
64 enum margin_step_exec_sts {
65 MARGIN_NAK = 0, // NAK/Set up for margin
66 MARGIN_LIM, // Too many errors (device limit)
67 MARGIN_THR // Test threshold has been reached
70 enum margin_dir { VOLT_UP = 0, VOLT_DOWN, TIM_LEFT, TIM_RIGHT };
72 /* Margining results of one lane of the receiver */
73 struct margin_res_lane {
76 enum margin_step_exec_sts statuses[4];
79 /* Reason not to run margining test on the Link/Receiver */
80 enum margin_test_status {
82 MARGIN_TEST_READY_BIT,
87 MARGIN_TEST_ARGS_LANES,
88 MARGIN_TEST_ARGS_RECVS,
92 /* All lanes Receiver results */
93 struct margin_results {
94 u8 recvn; // Receiver Number
95 struct margin_params params;
99 enum margin_test_status test_status;
101 /* Used to convert steps to physical quantity.
102 Calculated from MaxOffset and NumSteps */
107 struct margin_res_lane *lanes;
110 /* pcilmr arguments */
112 u8 steps_t; // 0 == use NumTimingSteps
113 u8 steps_v; // 0 == use NumVoltageSteps
114 u8 parallel_lanes; // [1; MaxLanes + 1]
115 u8 error_limit; // [0; 63]
116 u8 recvs[6]; // Receivers Numbers
117 u8 recvs_n; // 0 == margin all available receivers
118 u8 lanes[32]; // Lanes to Margin
119 u8 lanes_n; // 0 == margin all available lanes
120 bool run_margin; // Or print params only
121 u8 verbosity; // 0 - basic;
122 // 1 - add info about remaining time and lanes in progress during margining
124 u64 *steps_utility; // For ETA logging
127 /* Receiver structure */
129 struct margin_dev *dev;
130 u8 recvn; // Receiver Number
132 struct margin_params *params;
138 struct margin_lanes_data {
139 struct margin_recv *recv;
141 struct margin_res_lane *results;
157 /* Verify that devices form the link with 16 GT/s or 32 GT/s data rate */
158 bool margin_verify_link(struct pci_dev *down_port, struct pci_dev *up_port);
160 /* Check Margining Ready bit from Margining Port Status Register */
161 bool margin_check_ready_bit(struct pci_dev *dev);
163 /* Verify link and fill wrappers */
164 bool margin_fill_link(struct pci_dev *down_port, struct pci_dev *up_port,
165 struct margin_link *wrappers);
167 /* Disable ASPM, set Hardware Autonomous Speed/Width Disable bits */
168 bool margin_prep_link(struct margin_link *link);
170 /* Restore ASPM, Hardware Autonomous Speed/Width settings */
171 void margin_restore_link(struct margin_link *link);
175 /* Fill margin_params without calling other functions */
176 bool margin_read_params(struct pci_access *pacc, struct pci_dev *dev, u8 recvn,
177 struct margin_params *params);
179 enum margin_test_status margin_process_args(struct margin_dev *dev, struct margin_args *args);
181 /* Awaits that args are prepared through process_args.
182 Returns number of margined Receivers through recvs_n */
183 struct margin_results *margin_test_link(struct margin_link *link, struct margin_args *args,
186 void margin_free_results(struct margin_results *results, u8 results_n);
190 extern bool margin_global_logging;
191 extern bool margin_print_domain;
193 void margin_log(char *format, ...);
196 void margin_log_bdfs(struct pci_dev *down_port, struct pci_dev *up_port);
198 /* Print Link header (bdfs, width, speed) */
199 void margin_log_link(struct margin_link *link);
201 void margin_log_params(struct margin_params *params);
203 /* Print receiver number */
204 void margin_log_recvn(struct margin_recv *recv);
206 /* Print full info from Receiver struct */
207 void margin_log_receiver(struct margin_recv *recv);
209 /* Margining in progress log */
210 void margin_log_margining(struct margin_lanes_data arg);
214 void margin_results_print_brief(struct margin_results *results, u8 recvs_n);