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 <<<<<<< HEAD:drivers/scsi/qla2xxx/qla_dfs.c
  27         seq_printf(s, "In Pointer = %llx\n\n", ha->fce_wr);
  28 =======
  29         seq_printf(s, "In Pointer = %llx\n\n", (unsigned long long)ha->fce_wr);
  30 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/scsi/qla2xxx/qla_dfs.c
  31         seq_printf(s, "Base = %llx\n\n", (unsigned long long) ha->fce_dma);
  32         seq_printf(s, "FCE Enable Registers\n");
  33         seq_printf(s, "%08x %08x %08x %08x %08x %08x\n",
  34             ha->fce_mb[0], ha->fce_mb[2], ha->fce_mb[3], ha->fce_mb[4],
  35             ha->fce_mb[5], ha->fce_mb[6]);
  36
  37         fce = (uint32_t *) ha->fce;
  38         fce_start = (unsigned long long) ha->fce_dma;
  39         for (cnt = 0; cnt < fce_calc_size(ha->fce_bufs) / 4; cnt++) {
  40                 if (cnt % 8 == 0)
  41                         seq_printf(s, "\n%llx: ",
  42                             (unsigned long long)((cnt * 4) + fce_start));
  43                 else
  44                         seq_printf(s, " ");
  45                 seq_printf(s, "%08x", *fce++);
  46         }
  47
  48         seq_printf(s, "\nEnd\n");
  49
  50         mutex_unlock(&ha->fce_mutex);
  51
  52         return 0;
  53 }
  54
  55 static int
  56 qla2x00_dfs_fce_open(struct inode *inode, struct file *file)
  57 {
  58         scsi_qla_host_t *ha = inode->i_private;
  59         int rval;
  60
  61         if (!ha->flags.fce_enabled)
  62                 goto out;
  63
  64         mutex_lock(&ha->fce_mutex);
  65
  66         /* Pause tracing to flush FCE buffers. */
  67         rval = qla2x00_disable_fce_trace(ha, &ha->fce_wr, &ha->fce_rd);
  68         if (rval)
  69                 qla_printk(KERN_WARNING, ha,
  70                     "DebugFS: Unable to disable FCE (%d).\n", rval);
  71
  72         ha->flags.fce_enabled = 0;
  73
  74         mutex_unlock(&ha->fce_mutex);
  75 out:
  76         return single_open(file, qla2x00_dfs_fce_show, ha);
  77 }
  78
  79 static int
  80 qla2x00_dfs_fce_release(struct inode *inode, struct file *file)
  81 {
  82         scsi_qla_host_t *ha = inode->i_private;
  83         int rval;
  84
  85         if (ha->flags.fce_enabled)
  86                 goto out;
  87
  88         mutex_lock(&ha->fce_mutex);
  89
  90         /* Re-enable FCE tracing. */
  91         ha->flags.fce_enabled = 1;
  92         memset(ha->fce, 0, fce_calc_size(ha->fce_bufs));
  93         rval = qla2x00_enable_fce_trace(ha, ha->fce_dma, ha->fce_bufs,
  94             ha->fce_mb, &ha->fce_bufs);
  95         if (rval) {
  96                 qla_printk(KERN_WARNING, ha,
  97                     "DebugFS: Unable to reinitialize FCE (%d).\n", rval);
  98                 ha->flags.fce_enabled = 0;
  99         }
 100
 101         mutex_unlock(&ha->fce_mutex);
 102 out:
 103         return single_release(inode, file);
 104 }
 105
 106 static const struct file_operations dfs_fce_ops = {
 107         .open           = qla2x00_dfs_fce_open,
 108         .read           = seq_read,
 109         .llseek         = seq_lseek,
 110         .release        = qla2x00_dfs_fce_release,
 111 };
 112
 113 int
 114 qla2x00_dfs_setup(scsi_qla_host_t *ha)
 115 {
 116         if (!IS_QLA25XX(ha))
 117                 goto out;
 118         if (!ha->fce)
 119                 goto out;
 120
 121         if (qla2x00_dfs_root)
 122                 goto create_dir;
 123
 124         atomic_set(&qla2x00_dfs_root_count, 0);
 125         qla2x00_dfs_root = debugfs_create_dir(QLA2XXX_DRIVER_NAME, NULL);
 126         if (!qla2x00_dfs_root) {
 127                 qla_printk(KERN_NOTICE, ha,
 128                     "DebugFS: Unable to create root directory.\n");
 129                 goto out;
 130         }
 131
 132 create_dir:
 133         if (ha->dfs_dir)
 134                 goto create_nodes;
 135
 136         mutex_init(&ha->fce_mutex);
 137         ha->dfs_dir = debugfs_create_dir(ha->host_str, qla2x00_dfs_root);
 138         if (!ha->dfs_dir) {
 139                 qla_printk(KERN_NOTICE, ha,
 140                     "DebugFS: Unable to create ha directory.\n");
 141                 goto out;
 142         }
 143
 144         atomic_inc(&qla2x00_dfs_root_count);
 145
 146 create_nodes:
 147         ha->dfs_fce = debugfs_create_file("fce", S_IRUSR, ha->dfs_dir, ha,
 148             &dfs_fce_ops);
 149         if (!ha->dfs_fce) {
 150                 qla_printk(KERN_NOTICE, ha,
 151                     "DebugFS: Unable to fce node.\n");
 152                 goto out;
 153         }
 154 out:
 155         return 0;
 156 }
 157
 158 int
 159 qla2x00_dfs_remove(scsi_qla_host_t *ha)
 160 {
 161         if (ha->dfs_fce) {
 162                 debugfs_remove(ha->dfs_fce);
 163                 ha->dfs_fce = NULL;
 164         }
 165
 166         if (ha->dfs_dir) {
 167                 debugfs_remove(ha->dfs_dir);
 168                 ha->dfs_dir = NULL;
 169                 atomic_dec(&qla2x00_dfs_root_count);
 170         }
 171
 172         if (atomic_read(&qla2x00_dfs_root_count) == 0 &&
 173             qla2x00_dfs_root) {
 174                 debugfs_remove(qla2x00_dfs_root);
 175                 qla2x00_dfs_root = NULL;
 176         }
 177
 178         return 0;
 179 }