kernel/drivers/scsi/qla2xxx/qla_dfs.c

   1 /*
   2  * QLogic Fibre Channel HBA Driver
   3  * Copyright (c)  2003-2014 QLogic Corporation
   4  *
   5  * See LICENSE.qla2xxx for copyright and licensing details.
   6  */
   7 #include "qla_def.h"
   8
   9 #include <linux/debugfs.h>
  10 #include <linux/seq_file.h>
  11
  12 static struct dentry *qla2x00_dfs_root;
  13 static atomic_t qla2x00_dfs_root_count;
  14
  15 static int
  16 qla2x00_dfs_fce_show(struct seq_file *s, void *unused)
  17 {
  18         scsi_qla_host_t *vha = s->private;
  19         uint32_t cnt;
  20         uint32_t *fce;
  21         uint64_t fce_start;
  22         struct qla_hw_data *ha = vha->hw;
  23
  24         mutex_lock(&ha->fce_mutex);
  25
  26         seq_puts(s, "FCE Trace Buffer\n");
  27         seq_printf(s, "In Pointer = %llx\n\n", (unsigned long long)ha->fce_wr);
  28         seq_printf(s, "Base = %llx\n\n", (unsigned long long) ha->fce_dma);
  29         seq_puts(s, "FCE Enable Registers\n");
  30         seq_printf(s, "%08x %08x %08x %08x %08x %08x\n",
  31             ha->fce_mb[0], ha->fce_mb[2], ha->fce_mb[3], ha->fce_mb[4],
  32             ha->fce_mb[5], ha->fce_mb[6]);
  33
  34         fce = (uint32_t *) ha->fce;
  35         fce_start = (unsigned long long) ha->fce_dma;
  36         for (cnt = 0; cnt < fce_calc_size(ha->fce_bufs) / 4; cnt++) {
  37                 if (cnt % 8 == 0)
  38                         seq_printf(s, "\n%llx: ",
  39                             (unsigned long long)((cnt * 4) + fce_start));
  40                 else
  41                         seq_putc(s, ' ');
  42                 seq_printf(s, "%08x", *fce++);
  43         }
  44
  45         seq_puts(s, "\nEnd\n");
  46
  47         mutex_unlock(&ha->fce_mutex);
  48
  49         return 0;
  50 }
  51
  52 static int
  53 qla2x00_dfs_fce_open(struct inode *inode, struct file *file)
  54 {
  55         scsi_qla_host_t *vha = inode->i_private;
  56         struct qla_hw_data *ha = vha->hw;
  57         int rval;
  58
  59         if (!ha->flags.fce_enabled)
  60                 goto out;
  61
  62         mutex_lock(&ha->fce_mutex);
  63
  64         /* Pause tracing to flush FCE buffers. */
  65         rval = qla2x00_disable_fce_trace(vha, &ha->fce_wr, &ha->fce_rd);
  66         if (rval)
  67                 ql_dbg(ql_dbg_user, vha, 0x705c,
  68                     "DebugFS: Unable to disable FCE (%d).\n", rval);
  69
  70         ha->flags.fce_enabled = 0;
  71
  72         mutex_unlock(&ha->fce_mutex);
  73 out:
  74         return single_open(file, qla2x00_dfs_fce_show, vha);
  75 }
  76
  77 static int
  78 qla2x00_dfs_fce_release(struct inode *inode, struct file *file)
  79 {
  80         scsi_qla_host_t *vha = inode->i_private;
  81         struct qla_hw_data *ha = vha->hw;
  82         int rval;
  83
  84         if (ha->flags.fce_enabled)
  85                 goto out;
  86
  87         mutex_lock(&ha->fce_mutex);
  88
  89         /* Re-enable FCE tracing. */
  90         ha->flags.fce_enabled = 1;
  91         memset(ha->fce, 0, fce_calc_size(ha->fce_bufs));
  92         rval = qla2x00_enable_fce_trace(vha, ha->fce_dma, ha->fce_bufs,
  93             ha->fce_mb, &ha->fce_bufs);
  94         if (rval) {
  95                 ql_dbg(ql_dbg_user, vha, 0x700d,
  96                     "DebugFS: Unable to reinitialize FCE (%d).\n", rval);
  97                 ha->flags.fce_enabled = 0;
  98         }
  99
 100         mutex_unlock(&ha->fce_mutex);
 101 out:
 102         return single_release(inode, file);
 103 }
 104
 105 static const struct file_operations dfs_fce_ops = {
 106         .open           = qla2x00_dfs_fce_open,
 107         .read           = seq_read,
 108         .llseek         = seq_lseek,
 109         .release        = qla2x00_dfs_fce_release,
 110 };
 111
 112 int
 113 qla2x00_dfs_setup(scsi_qla_host_t *vha)
 114 {
 115         struct qla_hw_data *ha = vha->hw;
 116
 117         if (!IS_QLA25XX(ha) && !IS_QLA81XX(ha) && !IS_QLA83XX(ha) &&
 118             !IS_QLA27XX(ha))
 119                 goto out;
 120         if (!ha->fce)
 121                 goto out;
 122
 123         if (qla2x00_dfs_root)
 124                 goto create_dir;
 125
 126         atomic_set(&qla2x00_dfs_root_count, 0);
 127         qla2x00_dfs_root = debugfs_create_dir(QLA2XXX_DRIVER_NAME, NULL);
 128         if (!qla2x00_dfs_root) {
 129                 ql_log(ql_log_warn, vha, 0x00f7,
 130                     "Unable to create debugfs root directory.\n");
 131                 goto out;
 132         }
 133
 134 create_dir:
 135         if (ha->dfs_dir)
 136                 goto create_nodes;
 137
 138         mutex_init(&ha->fce_mutex);
 139         ha->dfs_dir = debugfs_create_dir(vha->host_str, qla2x00_dfs_root);
 140         if (!ha->dfs_dir) {
 141                 ql_log(ql_log_warn, vha, 0x00f8,
 142                     "Unable to create debugfs ha directory.\n");
 143                 goto out;
 144         }
 145
 146         atomic_inc(&qla2x00_dfs_root_count);
 147
 148 create_nodes:
 149         ha->dfs_fce = debugfs_create_file("fce", S_IRUSR, ha->dfs_dir, vha,
 150             &dfs_fce_ops);
 151         if (!ha->dfs_fce) {
 152                 ql_log(ql_log_warn, vha, 0x00f9,
 153                     "Unable to create debugfs fce node.\n");
 154                 goto out;
 155         }
 156 out:
 157         return 0;
 158 }
 159
 160 int
 161 qla2x00_dfs_remove(scsi_qla_host_t *vha)
 162 {
 163         struct qla_hw_data *ha = vha->hw;
 164         if (ha->dfs_fce) {
 165                 debugfs_remove(ha->dfs_fce);
 166                 ha->dfs_fce = NULL;
 167         }
 168
 169         if (ha->dfs_dir) {
 170                 debugfs_remove(ha->dfs_dir);
 171                 ha->dfs_dir = NULL;
 172                 atomic_dec(&qla2x00_dfs_root_count);
 173         }
 174
 175         if (atomic_read(&qla2x00_dfs_root_count) == 0 &&
 176             qla2x00_dfs_root) {
 177                 debugfs_remove(qla2x00_dfs_root);
 178                 qla2x00_dfs_root = NULL;
 179         }
 180
 181         return 0;
 182 }