// SPDX-License-Identifier: GPL-2.0-only
// Copyright 2014 Cisco Systems, Inc. All rights reserved.
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/debugfs.h>
#include "snic.h"
/*
* snic_debugfs_init - Initialize debugfs for snic debug logging
*
* Description :
* When Debugfs is configured this routine sets up fnic debugfs
* filesystem . If not already created . this routine will crate the
* fnic directory and statistics directory for trace buffer and
* stats logging
*/
void snic_debugfs_init(void )
{
snic_glob->trc_root = debugfs_create_dir("snic" , NULL);
snic_glob->stats_root = debugfs_create_dir("statistics" ,
snic_glob->trc_root);
}
/*
* snic_debugfs_term - Tear down debugfs intrastructure
*
* Description :
* When Debufs is configured this routine removes debugfs file system
* elements that are specific to snic
*/
void
snic_debugfs_term(void )
{
debugfs_remove(snic_glob->stats_root);
snic_glob->stats_root = NULL;
debugfs_remove(snic_glob->trc_root);
snic_glob->trc_root = NULL;
}
/*
* snic_reset_stats_open - Open the reset_stats file
*/
static int
snic_reset_stats_open(struct inode *inode, struct file *filp)
{
SNIC_BUG_ON(!inode->i_private);
filp->private_data = inode->i_private;
return 0 ;
}
/*
* snic_reset_stats_read - Read a reset_stats debugfs file
* @ filp : The file pointer to read from .
* @ ubuf : The buffer tocopy the data to .
* @ cnt : The number of bytes to read .
* @ ppos : The position in the file to start reading frm .
*
* Description :
* This routine reads value of variable reset_stats
* and stores into local @ buf . It will start reading file @ ppos and
* copy up to @ cnt of data to @ ubuf from @ buf .
*
* Returns :
* This function returns the amount of data that was read .
*/
static ssize_t
snic_reset_stats_read(struct file *filp,
char __user *ubuf,
size_t cnt,
loff_t *ppos)
{
struct snic *snic = (struct snic *) filp->private_data;
char buf[64 ];
int len;
len = sprintf(buf, "%u\n" , snic->reset_stats);
return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
}
/*
* snic_reset_stats_write - Write to reset_stats debugfs file
* @ filp : The file pointer to write from
* @ ubuf : The buffer to copy the data from .
* @ cnt : The number of bytes to write .
* @ ppos : The position in the file to start writing to .
*
* Description :
* This routine writes data from user buffer @ ubuf to buffer @ buf and
* resets cumulative stats of snic .
*
* Returns :
* This function returns the amount of data that was written .
*/
static ssize_t
snic_reset_stats_write(struct file *filp,
const char __user *ubuf,
size_t cnt,
loff_t *ppos)
{
struct snic *snic = (struct snic *) filp->private_data;
struct snic_stats *stats = &snic->s_stats;
u64 *io_stats_p = (u64 *) &stats->io;
u64 *fw_stats_p = (u64 *) &stats->fw;
char buf[64 ];
unsigned long val;
int ret;
if (cnt >= sizeof (buf))
return -EINVAL;
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
buf[cnt] = '\0' ;
ret = kstrtoul(buf, 10 , &val);
if (ret < 0 )
return ret;
snic->reset_stats = val;
if (snic->reset_stats) {
/* Skip variable is used to avoid descrepancies to Num IOs
* and IO Completions stats . Skip incrementing No IO Compls
* for pending active IOs after reset_stats
*/
atomic64_set(&snic->io_cmpl_skip,
atomic64_read(&stats->io.active));
memset(&stats->abts, 0 , sizeof (struct snic_abort_stats));
memset(&stats->reset, 0 , sizeof (struct snic_reset_stats));
memset(&stats->misc, 0 , sizeof (struct snic_misc_stats));
memset(io_stats_p+1 ,
0 ,
sizeof (struct snic_io_stats) - sizeof (u64));
memset(fw_stats_p+1 ,
0 ,
sizeof (struct snic_fw_stats) - sizeof (u64));
}
(*ppos)++;
SNIC_HOST_INFO(snic->shost, "Reset Op: Driver statistics.\n" );
return cnt;
}
static int
snic_reset_stats_release(struct inode *inode, struct file *filp)
{
filp->private_data = NULL;
return 0 ;
}
/*
* snic_stats_show - Formats and prints per host specific driver stats .
*/
static int
snic_stats_show(struct seq_file *sfp, void *data)
{
struct snic *snic = (struct snic *) sfp->private ;
struct snic_stats *stats = &snic->s_stats;
struct timespec64 last_isr_tms, last_ack_tms;
u64 maxio_tm;
int i;
/* Dump IO Stats */
seq_printf(sfp,
"------------------------------------------\n"
"\t\t IO Statistics\n"
"------------------------------------------\n" );
maxio_tm = (u64) atomic64_read(&stats->io.max_time);
seq_printf(sfp,
"Active IOs : %lld\n"
"Max Active IOs : %lld\n"
"Total IOs : %lld\n"
"IOs Completed : %lld\n"
"IOs Failed : %lld\n"
"IOs Not Found : %lld\n"
"Memory Alloc Failures : %lld\n"
"REQs Null : %lld\n"
"SCSI Cmd Pointers Null : %lld\n"
"Max SGL for any IO : %lld\n"
"Max IO Size : %lld Sectors\n"
"Max Queuing Time : %lld\n"
"Max Completion Time : %lld\n"
"Max IO Process Time(FW) : %lld (%u msec)\n" ,
(u64) atomic64_read(&stats->io.active),
(u64) atomic64_read(&stats->io.max_active),
(u64) atomic64_read(&stats->io.num_ios),
(u64) atomic64_read(&stats->io.compl ),
(u64) atomic64_read(&stats->io.fail),
(u64) atomic64_read(&stats->io.io_not_found),
(u64) atomic64_read(&stats->io.alloc_fail),
(u64) atomic64_read(&stats->io.req_null),
(u64) atomic64_read(&stats->io.sc_null),
(u64) atomic64_read(&stats->io.max_sgl),
(u64) atomic64_read(&stats->io.max_io_sz),
(u64) atomic64_read(&stats->io.max_qtime),
(u64) atomic64_read(&stats->io.max_cmpl_time),
maxio_tm,
jiffies_to_msecs(maxio_tm));
seq_puts(sfp, "\nSGL Counters\n" );
for (i = 0 ; i < SNIC_MAX_SG_DESC_CNT; i++) {
seq_printf(sfp,
"%10lld " ,
(u64) atomic64_read(&stats->io.sgl_cnt[i]));
if ((i + 1 ) % 8 == 0 )
seq_puts(sfp, "\n" );
}
/* Dump Abort Stats */
seq_printf(sfp,
"\n-------------------------------------------\n"
"\t\t Abort Statistics\n"
"---------------------------------------------\n" );
seq_printf(sfp,
"Aborts : %lld\n"
"Aborts Fail : %lld\n"
"Aborts Driver Timeout : %lld\n"
"Abort FW Timeout : %lld\n"
"Abort IO NOT Found : %lld\n"
"Abort Queuing Failed : %lld\n" ,
(u64) atomic64_read(&stats->abts.num),
(u64) atomic64_read(&stats->abts.fail),
(u64) atomic64_read(&stats->abts.drv_tmo),
(u64) atomic64_read(&stats->abts.fw_tmo),
(u64) atomic64_read(&stats->abts.io_not_found),
(u64) atomic64_read(&stats->abts.q_fail));
/* Dump Reset Stats */
seq_printf(sfp,
"\n-------------------------------------------\n"
"\t\t Reset Statistics\n"
"---------------------------------------------\n" );
seq_printf(sfp,
"HBA Resets : %lld\n"
"HBA Reset Cmpls : %lld\n"
"HBA Reset Fail : %lld\n" ,
(u64) atomic64_read(&stats->reset.hba_resets),
(u64) atomic64_read(&stats->reset.hba_reset_cmpl),
(u64) atomic64_read(&stats->reset.hba_reset_fail));
/* Dump Firmware Stats */
seq_printf(sfp,
"\n-------------------------------------------\n"
"\t\t Firmware Statistics\n"
"---------------------------------------------\n" );
seq_printf(sfp,
"Active FW Requests : %lld\n"
"Max FW Requests : %lld\n"
"FW Out Of Resource Errs : %lld\n"
"FW IO Errors : %lld\n"
"FW SCSI Errors : %lld\n" ,
(u64) atomic64_read(&stats->fw.actv_reqs),
(u64) atomic64_read(&stats->fw.max_actv_reqs),
(u64) atomic64_read(&stats->fw.out_of_res),
(u64) atomic64_read(&stats->fw.io_errs),
(u64) atomic64_read(&stats->fw.scsi_errs));
/* Dump Miscellenous Stats */
seq_printf(sfp,
"\n---------------------------------------------\n"
"\t\t Other Statistics\n"
"\n---------------------------------------------\n" );
jiffies_to_timespec64(stats->misc.last_isr_time, &last_isr_tms);
jiffies_to_timespec64(stats->misc.last_ack_time, &last_ack_tms);
seq_printf(sfp,
"Last ISR Time : %llu (%8llu.%09lu)\n"
"Last Ack Time : %llu (%8llu.%09lu)\n"
"Ack ISRs : %llu\n"
"IO Cmpl ISRs : %llu\n"
"Err Notify ISRs : %llu\n"
"Max CQ Entries : %lld\n"
"Data Count Mismatch : %lld\n"
"IOs w/ Timeout Status : %lld\n"
"IOs w/ Aborted Status : %lld\n"
"IOs w/ SGL Invalid Stat : %lld\n"
"WQ Desc Alloc Fail : %lld\n"
"Queue Full : %lld\n"
"Queue Ramp Up : %lld\n"
"Queue Ramp Down : %lld\n"
"Queue Last Queue Depth : %lld\n"
"Target Not Ready : %lld\n" ,
(u64) stats->misc.last_isr_time,
last_isr_tms.tv_sec, last_isr_tms.tv_nsec,
(u64)stats->misc.last_ack_time,
last_ack_tms.tv_sec, last_ack_tms.tv_nsec,
(u64) atomic64_read(&stats->misc.ack_isr_cnt),
(u64) atomic64_read(&stats->misc.cmpl_isr_cnt),
(u64) atomic64_read(&stats->misc.errnotify_isr_cnt),
(u64) atomic64_read(&stats->misc.max_cq_ents),
(u64) atomic64_read(&stats->misc.data_cnt_mismat),
(u64) atomic64_read(&stats->misc.io_tmo),
(u64) atomic64_read(&stats->misc.io_aborted),
(u64) atomic64_read(&stats->misc.sgl_inval),
(u64) atomic64_read(&stats->misc.wq_alloc_fail),
(u64) atomic64_read(&stats->misc.qfull),
(u64) atomic64_read(&stats->misc.qsz_rampup),
(u64) atomic64_read(&stats->misc.qsz_rampdown),
(u64) atomic64_read(&stats->misc.last_qsz),
(u64) atomic64_read(&stats->misc.tgt_not_rdy));
return 0 ;
}
DEFINE_SHOW_ATTRIBUTE(snic_stats);
static const struct file_operations snic_reset_stats_fops = {
.owner = THIS_MODULE,
.open = snic_reset_stats_open,
.read = snic_reset_stats_read,
.write = snic_reset_stats_write,
.release = snic_reset_stats_release,
};
/*
* snic_stats_init - Initialize stats struct and create stats file
* per snic
*
* Description :
* When debugfs is cofigured this routine sets up the stats file per snic
* It will create file stats and reset_stats under statistics / host # directory
* to log per snic stats
*/
void snic_stats_debugfs_init(struct snic *snic)
{
char name[16 ];
snprintf(name, sizeof (name), "host%d" , snic->shost->host_no);
snic->stats_host = debugfs_create_dir(name, snic_glob->stats_root);
snic->stats_file = debugfs_create_file("stats" , S_IFREG|S_IRUGO,
snic->stats_host, snic,
&snic_stats_fops);
snic->reset_stats_file = debugfs_create_file("reset_stats" ,
S_IFREG|S_IRUGO|S_IWUSR,
snic->stats_host, snic,
&snic_reset_stats_fops);
}
/*
* snic_stats_debugfs_remove - Tear down debugfs infrastructure of stats
*
* Description :
* When Debufs is configured this routine removes debugfs file system
* elements that are specific to to snic stats
*/
void
snic_stats_debugfs_remove(struct snic *snic)
{
debugfs_remove(snic->stats_file);
snic->stats_file = NULL;
debugfs_remove(snic->reset_stats_file);
snic->reset_stats_file = NULL;
debugfs_remove(snic->stats_host);
snic->stats_host = NULL;
}
/* Trace Facility related API */
static void *
snic_trc_seq_start(struct seq_file *sfp, loff_t *pos)
{
return &snic_glob->trc;
}
static void *
snic_trc_seq_next(struct seq_file *sfp, void *data, loff_t *pos)
{
return NULL;
}
static void
snic_trc_seq_stop(struct seq_file *sfp, void *data)
{
}
#define SNIC_TRC_PBLEN 256
static int
snic_trc_seq_show(struct seq_file *sfp, void *data)
{
char buf[SNIC_TRC_PBLEN];
if (snic_get_trc_data(buf, SNIC_TRC_PBLEN) > 0 )
seq_printf(sfp, "%s\n" , buf);
return 0 ;
}
static const struct seq_operations snic_trc_sops = {
.start = snic_trc_seq_start,
.next = snic_trc_seq_next,
.stop = snic_trc_seq_stop,
.show = snic_trc_seq_show,
};
DEFINE_SEQ_ATTRIBUTE(snic_trc);
#define TRC_ENABLE_FILE "tracing_enable"
#define TRC_FILE "trace"
/*
* snic_trc_debugfs_init : creates trace / tracing_enable files for trace
* under debugfs
*/
void snic_trc_debugfs_init(void )
{
debugfs_create_bool(TRC_ENABLE_FILE, S_IFREG | S_IRUGO | S_IWUSR,
snic_glob->trc_root, &snic_glob->trc.enable);
debugfs_create_file(TRC_FILE, S_IFREG | S_IRUGO | S_IWUSR,
snic_glob->trc_root, NULL, &snic_trc_fops);
}
/*
* snic_trc_debugfs_term : cleans up the files created for trace under debugfs
*/
void
snic_trc_debugfs_term(void )
{
debugfs_lookup_and_remove(TRC_FILE, snic_glob->trc_root);
debugfs_lookup_and_remove(TRC_ENABLE_FILE, snic_glob->trc_root);
}
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(vorverarbeitet am 2026-09-27)
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