1 /* 2 * QLogic Fibre Channel HBA Driver 3 * Copyright (c) 2003-2008 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", (unsigned long long)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 } 176