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| 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 | +} |
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