drivers/scsi/qla2xxx/qla_dfs.c

   1 /*
   2  * QLogic Fibre Channel HBA Driver
   3  * Copyright (c)  2003-2005 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 *ha = s->private;
  19         uint32_t cnt;
  20         uint32_t *fce;
  21         uint64_t fce_start;
  22
  23         mutex_lock(&ha->fce_mutex);
  24
  25         seq_printf(s, "FCE Trace Buffer\n");
  26         seq_printf(s, "In Pointer = %llx\n\n", ha->fce_wr);
  27         seq_printf(s, "Base = %llx\n\n", (unsigned long long) ha->fce_dma);
  28         seq_printf(s, "FCE Enable Registers\n");
  29         seq_printf(s, "%08x %08x %08x %08x %08x %08x\n",
  30             ha->fce_mb[0], ha->fce_mb[2], ha->fce_mb[3], ha->fce_mb[4],
  31             ha->fce_mb[5], ha->fce_mb[6]);
  32
  33         fce = (uint32_t *) ha->fce;
  34         fce_start = (unsigned long long) ha->fce_dma;
  35         for (cnt = 0; cnt < fce_calc_size(ha->fce_bufs) / 4; cnt++) {
  36                 if (cnt % 8 == 0)
  37                         seq_printf(s, "\n%llx: ",
  38                             (unsigned long long)((cnt * 4) + fce_start));
  39                 else
  40                         seq_printf(s, " ");
  41                 seq_printf(s, "%08x", *fce++);
  42         }
  43
  44         seq_printf(s, "\nEnd\n");
  45
  46         mutex_unlock(&ha->fce_mutex);
  47
  48         return 0;
  49 }
  50
  51 static int
  52 qla2x00_dfs_fce_open(struct inode *inode, struct file *file)
  53 {
  54         scsi_qla_host_t *ha = inode->i_private;
  55         int rval;
  56
  57         if (!ha->flags.fce_enabled)
  58                 goto out;
  59
  60         mutex_lock(&ha->fce_mutex);
  61
  62         /* Pause tracing to flush FCE buffers. */
  63         rval = qla2x00_disable_fce_trace(ha, &ha->fce_wr, &ha->fce_rd);
  64         if (rval)
  65                 qla_printk(KERN_WARNING, ha,
  66                     "DebugFS: Unable to disable FCE (%d).\n", rval);
  67
  68         ha->flags.fce_enabled = 0;
  69
  70         mutex_unlock(&ha->fce_mutex);
  71 out:
  72         return single_open(file, qla2x00_dfs_fce_show, ha);
  73 }
  74
  75 static int
  76 qla2x00_dfs_fce_release(struct inode *inode, struct file *file)
  77 {
  78         scsi_qla_host_t *ha = inode->i_private;
  79         int rval;
  80
  81         if (ha->flags.fce_enabled)
  82                 goto out;
  83
  84         mutex_lock(&ha->fce_mutex);
  85
  86         /* Re-enable FCE tracing. */
  87         ha->flags.fce_enabled = 1;
  88         memset(ha->fce, 0, fce_calc_size(ha->fce_bufs));
  89         rval = qla2x00_enable_fce_trace(ha, ha->fce_dma, ha->fce_bufs,
  90             ha->fce_mb, &ha->fce_bufs);
  91         if (rval) {
  92                 qla_printk(KERN_WARNING, ha,
  93                     "DebugFS: Unable to reinitialize FCE (%d).\n", rval);
  94                 ha->flags.fce_enabled = 0;
  95         }
  96
  97         mutex_unlock(&ha->fce_mutex);
  98 out:
  99         return single_release(inode, file);
 100 }
 101
 102 static const struct file_operations dfs_fce_ops = {
 103         .open           = qla2x00_dfs_fce_open,
 104         .read           = seq_read,
 105         .llseek         = seq_lseek,
 106         .release        = qla2x00_dfs_fce_release,
 107 };
 108
 109 int
 110 qla2x00_dfs_setup(scsi_qla_host_t *ha)
 111 {
 112         if (!IS_QLA25XX(ha))
 113                 goto out;
 114         if (!ha->fce)
 115                 goto out;
 116
 117         if (qla2x00_dfs_root)
 118                 goto create_dir;
 119
 120         atomic_set(&qla2x00_dfs_root_count, 0);
 121         qla2x00_dfs_root = debugfs_create_dir(QLA2XXX_DRIVER_NAME, NULL);
 122         if (!qla2x00_dfs_root) {
 123                 qla_printk(KERN_NOTICE, ha,
 124                     "DebugFS: Unable to create root directory.\n");
 125                 goto out;
 126         }
 127
 128 create_dir:
 129         if (ha->dfs_dir)
 130                 goto create_nodes;
 131
 132         mutex_init(&ha->fce_mutex);
 133         ha->dfs_dir = debugfs_create_dir(ha->host_str, qla2x00_dfs_root);
 134         if (!ha->dfs_dir) {
 135                 qla_printk(KERN_NOTICE, ha,
 136                     "DebugFS: Unable to create ha directory.\n");
 137                 goto out;
 138         }
 139
 140         atomic_inc(&qla2x00_dfs_root_count);
 141
 142 create_nodes:
 143         ha->dfs_fce = debugfs_create_file("fce", S_IRUSR, ha->dfs_dir, ha,
 144             &dfs_fce_ops);
 145         if (!ha->dfs_fce) {
 146                 qla_printk(KERN_NOTICE, ha,
 147                     "DebugFS: Unable to fce node.\n");
 148                 goto out;
 149         }
 150 out:
 151         return 0;
 152 }
 153
 154 int
 155 qla2x00_dfs_remove(scsi_qla_host_t *ha)
 156 {
 157         if (ha->dfs_fce) {
 158                 debugfs_remove(ha->dfs_fce);
 159                 ha->dfs_fce = NULL;
 160         }
 161
 162         if (ha->dfs_dir) {
 163                 debugfs_remove(ha->dfs_dir);
 164                 ha->dfs_dir = NULL;
 165                 atomic_dec(&qla2x00_dfs_root_count);
 166         }
 167
 168         if (atomic_read(&qla2x00_dfs_root_count) == 0 &&
 169             qla2x00_dfs_root) {
 170                 debugfs_remove(qla2x00_dfs_root);
 171                 qla2x00_dfs_root = NULL;
 172         }
 173
 174         return 0;
 175 }