diff options
Diffstat (limited to 'drivers/scsi/qla2xxx/qla_dfs.c')
| -rw-r--r-- | drivers/scsi/qla2xxx/qla_dfs.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/scsi/qla2xxx/qla_dfs.c b/drivers/scsi/qla2xxx/qla_dfs.c new file mode 100644 index 000000000000..1479c60441c8 --- /dev/null +++ b/drivers/scsi/qla2xxx/qla_dfs.c @@ -0,0 +1,175 @@ +/* + * QLogic Fibre Channel HBA Driver + * Copyright (c) 2003-2005 QLogic Corporation + * + * See LICENSE.qla2xxx for copyright and licensing details. + */ +#include "qla_def.h" + +#include <linux/debugfs.h> +#include <linux/seq_file.h> + +static struct dentry *qla2x00_dfs_root; +static atomic_t qla2x00_dfs_root_count; + +static int +qla2x00_dfs_fce_show(struct seq_file *s, void *unused) +{ + scsi_qla_host_t *ha = s->private; + uint32_t cnt; + uint32_t *fce; + uint64_t fce_start; + + mutex_lock(&ha->fce_mutex); + + seq_printf(s, "FCE Trace Buffer\n"); + seq_printf(s, "In Pointer = %llx\n\n", ha->fce_wr); + seq_printf(s, "Base = %llx\n\n", (unsigned long long) ha->fce_dma); + seq_printf(s, "FCE Enable Registers\n"); + seq_printf(s, "%08x %08x %08x %08x %08x %08x\n", + ha->fce_mb[0], ha->fce_mb[2], ha->fce_mb[3], ha->fce_mb[4], + ha->fce_mb[5], ha->fce_mb[6]); + + fce = (uint32_t *) ha->fce; + fce_start = (unsigned long long) ha->fce_dma; + for (cnt = 0; cnt < fce_calc_size(ha->fce_bufs) / 4; cnt++) { + if (cnt % 8 == 0) + seq_printf(s, "\n%llx: ", + (unsigned long long)((cnt * 4) + fce_start)); + else + seq_printf(s, " "); + seq_printf(s, "%08x", *fce++); + } + + seq_printf(s, "\nEnd\n"); + + mutex_unlock(&ha->fce_mutex); + + return 0; +} + +static int +qla2x00_dfs_fce_open(struct inode *inode, struct file *file) +{ + scsi_qla_host_t *ha = inode->i_private; + int rval; + + if (!ha->flags.fce_enabled) + goto out; + + mutex_lock(&ha->fce_mutex); + + /* Pause tracing to flush FCE buffers. */ + rval = qla2x00_disable_fce_trace(ha, &ha->fce_wr, &ha->fce_rd); + if (rval) + qla_printk(KERN_WARNING, ha, + "DebugFS: Unable to disable FCE (%d).\n", rval); + + ha->flags.fce_enabled = 0; + + mutex_unlock(&ha->fce_mutex); +out: + return single_open(file, qla2x00_dfs_fce_show, ha); +} + +static int +qla2x00_dfs_fce_release(struct inode *inode, struct file *file) +{ + scsi_qla_host_t *ha = inode->i_private; + int rval; + + if (ha->flags.fce_enabled) + goto out; + + mutex_lock(&ha->fce_mutex); + + /* Re-enable FCE tracing. */ + ha->flags.fce_enabled = 1; + memset(ha->fce, 0, fce_calc_size(ha->fce_bufs)); + rval = qla2x00_enable_fce_trace(ha, ha->fce_dma, ha->fce_bufs, + ha->fce_mb, &ha->fce_bufs); + if (rval) { + qla_printk(KERN_WARNING, ha, + "DebugFS: Unable to reinitialize FCE (%d).\n", rval); + ha->flags.fce_enabled = 0; + } + + mutex_unlock(&ha->fce_mutex); +out: + return single_release(inode, file); +} + +static const struct file_operations dfs_fce_ops = { + .open = qla2x00_dfs_fce_open, + .read = seq_read, + .llseek = seq_lseek, + .release = qla2x00_dfs_fce_release, +}; + +int +qla2x00_dfs_setup(scsi_qla_host_t *ha) +{ + if (!IS_QLA25XX(ha)) + goto out; + if (!ha->fce) + goto out; + + if (qla2x00_dfs_root) + goto create_dir; + + atomic_set(&qla2x00_dfs_root_count, 0); + qla2x00_dfs_root = debugfs_create_dir(QLA2XXX_DRIVER_NAME, NULL); + if (!qla2x00_dfs_root) { + qla_printk(KERN_NOTICE, ha, + "DebugFS: Unable to create root directory.\n"); + goto out; + } + +create_dir: + if (ha->dfs_dir) + goto create_nodes; + + mutex_init(&ha->fce_mutex); + ha->dfs_dir = debugfs_create_dir(ha->host_str, qla2x00_dfs_root); + if (!ha->dfs_dir) { + qla_printk(KERN_NOTICE, ha, + "DebugFS: Unable to create ha directory.\n"); + goto out; + } + + atomic_inc(&qla2x00_dfs_root_count); + +create_nodes: + ha->dfs_fce = debugfs_create_file("fce", S_IRUSR, ha->dfs_dir, ha, + &dfs_fce_ops); + if (!ha->dfs_fce) { + qla_printk(KERN_NOTICE, ha, + "DebugFS: Unable to fce node.\n"); + goto out; + } +out: + return 0; +} + +int +qla2x00_dfs_remove(scsi_qla_host_t *ha) +{ + if (ha->dfs_fce) { + debugfs_remove(ha->dfs_fce); + ha->dfs_fce = NULL; + } + + if (ha->dfs_dir) { + debugfs_remove(ha->dfs_dir); + ha->dfs_dir = NULL; + atomic_dec(&qla2x00_dfs_root_count); + } + + if (atomic_read(&qla2x00_dfs_root_count) == 0 && + qla2x00_dfs_root) { + debugfs_remove(qla2x00_dfs_root); + qla2x00_dfs_root = NULL; + } + + return 0; +} |