drivers/net/ethernet/broadcom/bnxt/bnxt_debugfs.c

   1 /* Broadcom NetXtreme-C/E network driver.
   2  *
   3  * Copyright (c) 2017-2018 Broadcom Limited
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation.
   8  */
   9
  10 #include <linux/debugfs.h>
  11 #include <linux/module.h>
  12 #include <linux/pci.h>
  13 #include "bnxt_hsi.h"
  14 #include <linux/net_dim.h>
  15 #include "bnxt.h"
  16 #include "bnxt_debugfs.h"
  17
  18 static struct dentry *bnxt_debug_mnt;
  19
  20 static ssize_t debugfs_dim_read(struct file *filep,
  21                                 char __user *buffer,
  22                                 size_t count, loff_t *ppos)
  23 {
  24         struct net_dim *dim = filep->private_data;
  25         int len;
  26         char *buf;
  27
  28         if (*ppos)
  29                 return 0;
  30         if (!dim)
  31                 return -ENODEV;
  32         buf = kasprintf(GFP_KERNEL,
  33                         "state = %d\n" \
  34                         "profile_ix = %d\n" \
  35                         "mode = %d\n" \
  36                         "tune_state = %d\n" \
  37                         "steps_right = %d\n" \
  38                         "steps_left = %d\n" \
  39                         "tired = %d\n",
  40                         dim->state,
  41                         dim->profile_ix,
  42                         dim->mode,
  43                         dim->tune_state,
  44                         dim->steps_right,
  45                         dim->steps_left,
  46                         dim->tired);
  47         if (!buf)
  48                 return -ENOMEM;
  49         if (count < strlen(buf)) {
  50                 kfree(buf);
  51                 return -ENOSPC;
  52         }
  53         len = simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
  54         kfree(buf);
  55         return len;
  56 }
  57
  58 static const struct file_operations debugfs_dim_fops = {
  59         .owner = THIS_MODULE,
  60         .open = simple_open,
  61         .read = debugfs_dim_read,
  62 };
  63
  64 static struct dentry *debugfs_dim_ring_init(struct net_dim *dim, int ring_idx,
  65                                             struct dentry *dd)
  66 {
  67         static char qname[16];
  68
  69         snprintf(qname, 10, "%d", ring_idx);
  70         return debugfs_create_file(qname, 0600, dd,
  71                                    dim, &debugfs_dim_fops);
  72 }
  73
  74 void bnxt_debug_dev_init(struct bnxt *bp)
  75 {
  76         const char *pname = pci_name(bp->pdev);
  77         struct dentry *pdevf;
  78         int i;
  79
  80         bp->debugfs_pdev = debugfs_create_dir(pname, bnxt_debug_mnt);
  81         if (bp->debugfs_pdev) {
  82                 pdevf = debugfs_create_dir("dim", bp->debugfs_pdev);
  83                 if (!pdevf) {
  84                         pr_err("failed to create debugfs entry %s/dim\n",
  85                                pname);
  86                         return;
  87                 }
  88                 bp->debugfs_dim = pdevf;
  89                 /* create files for each rx ring */
  90                 for (i = 0; i < bp->cp_nr_rings; i++) {
  91                         struct bnxt_cp_ring_info *cpr = &bp->bnapi[i]->cp_ring;
  92
  93                         if (cpr && bp->bnapi[i]->rx_ring) {
  94                                 pdevf = debugfs_dim_ring_init(&cpr->dim, i,
  95                                                               bp->debugfs_dim);
  96                                 if (!pdevf)
  97                                         pr_err("failed to create debugfs entry %s/dim/%d\n",
  98                                                pname, i);
  99                         }
 100                 }
 101         } else {
 102                 pr_err("failed to create debugfs entry %s\n", pname);
 103         }
 104 }
 105
 106 void bnxt_debug_dev_exit(struct bnxt *bp)
 107 {
 108         if (bp) {
 109                 debugfs_remove_recursive(bp->debugfs_pdev);
 110                 bp->debugfs_pdev = NULL;
 111         }
 112 }
 113
 114 void bnxt_debug_init(void)
 115 {
 116         bnxt_debug_mnt = debugfs_create_dir("bnxt_en", NULL);
 117         if (!bnxt_debug_mnt)
 118                 pr_err("failed to init bnxt_en debugfs\n");
 119 }
 120
 121 void bnxt_debug_exit(void)
 122 {
 123         debugfs_remove_recursive(bnxt_debug_mnt);
 124 }