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/*
* The PCI Utilities -- Margining utility main function
*
* Copyright (c) 2023-2024 KNS Group LLC (YADRO)
*
* Can be freely distributed and used under the terms of the GNU GPL v2+.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include "lmr/lmr.h"
const char program_name[] = "pcilmr";
static void
scan_links(struct pci_access *pacc, bool only_ready)
{
if (only_ready)
printf("Links ready for margining:\n");
else
printf("Links with Lane Margining at the Receiver capabilities:\n");
bool flag = true;
for (struct pci_dev *p = pacc->devices; p; p = p->next)
{
if (pci_find_cap(p, PCI_EXT_CAP_ID_LMR, PCI_CAP_EXTENDED) && margin_port_is_down(p))
{
struct pci_dev *down = NULL;
struct pci_dev *up = NULL;
margin_find_pair(pacc, p, &down, &up);
if (down && margin_verify_link(down, up))
{
margin_log_bdfs(down, up);
if (!only_ready && (margin_check_ready_bit(down) || margin_check_ready_bit(up)))
printf(" - Ready");
printf("\n");
flag = false;
}
}
}
if (flag)
printf("Links not found or you don't have enough privileges.\n");
pci_cleanup(pacc);
exit(0);
}
int
main(int argc, char **argv)
{
struct pci_access *pacc;
u8 links_n = 0;
struct margin_link *links;
bool *checks_status_ports;
enum margin_mode mode;
/* each link has several receivers -> several results */
struct margin_results **results;
u8 *results_n;
pacc = pci_alloc();
pci_init(pacc);
pci_scan_bus(pacc);
margin_print_domain = false;
for (struct pci_dev *dev = pacc->devices; dev; dev = dev->next)
{
if (dev->domain != 0)
{
margin_print_domain = true;
break;
}
}
margin_global_logging = true;
struct option long_options[]
= { { .name = "margin", .has_arg = no_argument, .flag = NULL, .val = 0 },
{ .name = "scan", .has_arg = no_argument, .flag = NULL, .val = 1 },
{ .name = "full", .has_arg = no_argument, .flag = NULL, .val = 2 },
{ 0, 0, 0, 0 } };
opterr = 0;
int c;
c = getopt_long(argc, argv, "+", long_options, NULL);
switch (c)
{
case -1: /* no options (strings like component are possible) */
/* FALLTHROUGH */
case 0:
mode = MARGIN;
break;
case 1:
mode = SCAN;
if (optind == argc)
scan_links(pacc, false);
else
die("Invalid arguments\n\n%s", usage);
break;
case 2:
mode = FULL;
break;
default: /* unknown option symbol */
mode = MARGIN;
optind--;
break;
}
opterr = 1;
links = margin_parse_util_args(pacc, argc, argv, mode, &links_n);
struct margin_com_args *com_args = links[0].args.common;
results = xmalloc(links_n * sizeof(*results));
results_n = xmalloc(links_n * sizeof(*results_n));
checks_status_ports = xmalloc(links_n * sizeof(*checks_status_ports));
for (int i = 0; i < links_n; i++)
{
enum margin_test_status args_status;
if ((args_status = margin_process_args(&links[i])) != MARGIN_TEST_OK)
{
checks_status_ports[i] = false;
results[i] = xmalloc(sizeof(*results[i]));
results[i]->test_status = args_status;
continue;
}
checks_status_ports[i] = true;
struct margin_params params;
struct margin_link_args *link_args = &links[i].args;
for (int j = 0; j < link_args->recvs_n; j++)
{
if (margin_read_params(
pacc, link_args->recvs[j] == 6 ? links[i].up_port.dev : links[i].down_port.dev,
link_args->recvs[j], ¶ms))
{
u8 steps_t = link_args->steps_t ? link_args->steps_t : params.timing_steps;
u8 steps_v = link_args->steps_v ? link_args->steps_v : params.volt_steps;
u8 parallel_recv = link_args->parallel_lanes > params.max_lanes + 1 ?
params.max_lanes + 1 :
link_args->parallel_lanes;
u8 step_multiplier
= link_args->lanes_n / parallel_recv + ((link_args->lanes_n % parallel_recv) > 0);
com_args->steps_utility += steps_t * step_multiplier;
if (params.ind_left_right_tim)
com_args->steps_utility += steps_t * step_multiplier;
if (params.volt_support)
{
com_args->steps_utility += steps_v * step_multiplier;
if (params.ind_up_down_volt)
com_args->steps_utility += steps_v * step_multiplier;
}
}
}
}
for (int i = 0; i < links_n; i++)
{
if (checks_status_ports[i])
results[i] = margin_test_link(&links[i], &results_n[i]);
else
{
results_n[i] = 1;
if (results[i]->test_status == MARGIN_TEST_ARGS_RECVS)
{
margin_log_link(&links[i]);
printf("\nInvalid RecNums specified.\n");
}
else if (results[i]->test_status == MARGIN_TEST_ARGS_LANES)
{
margin_log_link(&links[i]);
printf("\nInvalid lanes specified.\n");
}
}
printf("\n----\n\n");
}
if (com_args->run_margin)
{
printf("Results:\n");
printf(
"Margining statuses:\nLIM -\tErrorCount exceeded Error Count Limit (found device limit)\n");
printf("NAK -\tDevice didn't execute last command, \n\tso result may be less reliable\n");
printf("THR -\tThe set (using the utility options) \n\tstep threshold has been reached\n\n");
printf("Notations:\nst - steps\n\n");
for (int i = 0; i < links_n; i++)
{
printf("Link ");
margin_log_bdfs(links[i].down_port.dev, links[i].up_port.dev);
printf(":\n\n");
margin_results_print_brief(results[i], results_n[i], &links[i].args);
if (com_args->save_csv)
margin_results_save_csv(results[i], results_n[i], &links[i]);
printf("\n");
}
}
for (int i = 0; i < links_n; i++)
margin_free_results(results[i], results_n[i]);
free(results_n);
free(results);
free(com_args);
free(links);
free(checks_status_ports);
pci_cleanup(pacc);
return 0;
}
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