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dfb99b050e
Based on the normalized pattern:
this program is free software you may redistribute it and/or modify it
under the terms of the gnu general public license as published by the
free software foundation version 2 of the license the software is
provided as is without warranty of any kind express or implied
including but not limited to the warranties of merchantability fitness
for a particular purpose and noninfringement in no event shall the
authors or copyright holders be liable for any claim damages or other
liability whether in an action of contract tort or otherwise arising
from out of or in connection with the software or the use or other
dealings in the software
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-only
has been chosen to replace the boilerplate/reference.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
157 lines
3.1 KiB
C
157 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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// Copyright 2014 Cisco Systems, Inc. All rights reserved.
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#include <linux/module.h>
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#include <linux/mempool.h>
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#include <linux/errno.h>
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#include <linux/vmalloc.h>
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#include "snic_io.h"
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#include "snic.h"
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/*
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* snic_get_trc_buf : Allocates a trace record and returns.
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*/
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struct snic_trc_data *
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snic_get_trc_buf(void)
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{
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struct snic_trc *trc = &snic_glob->trc;
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struct snic_trc_data *td = NULL;
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unsigned long flags;
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spin_lock_irqsave(&trc->lock, flags);
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td = &trc->buf[trc->wr_idx];
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trc->wr_idx++;
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if (trc->wr_idx == trc->max_idx)
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trc->wr_idx = 0;
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if (trc->wr_idx != trc->rd_idx) {
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spin_unlock_irqrestore(&trc->lock, flags);
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goto end;
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}
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trc->rd_idx++;
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if (trc->rd_idx == trc->max_idx)
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trc->rd_idx = 0;
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td->ts = 0; /* Marker for checking the record, for complete data*/
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spin_unlock_irqrestore(&trc->lock, flags);
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end:
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return td;
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} /* end of snic_get_trc_buf */
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/*
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* snic_fmt_trc_data : Formats trace data for printing.
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*/
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static int
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snic_fmt_trc_data(struct snic_trc_data *td, char *buf, int buf_sz)
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{
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int len = 0;
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struct timespec64 tmspec;
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jiffies_to_timespec64(td->ts, &tmspec);
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len += snprintf(buf, buf_sz,
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"%llu.%09lu %-25s %3d %4x %16llx %16llx %16llx %16llx %16llx\n",
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tmspec.tv_sec,
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tmspec.tv_nsec,
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td->fn,
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td->hno,
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td->tag,
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td->data[0], td->data[1], td->data[2], td->data[3],
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td->data[4]);
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return len;
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} /* end of snic_fmt_trc_data */
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/*
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* snic_get_trc_data : Returns a formatted trace buffer.
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*/
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int
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snic_get_trc_data(char *buf, int buf_sz)
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{
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struct snic_trc_data *td = NULL;
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struct snic_trc *trc = &snic_glob->trc;
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unsigned long flags;
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spin_lock_irqsave(&trc->lock, flags);
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if (trc->rd_idx == trc->wr_idx) {
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spin_unlock_irqrestore(&trc->lock, flags);
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return -1;
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}
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td = &trc->buf[trc->rd_idx];
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if (td->ts == 0) {
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/* write in progress. */
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spin_unlock_irqrestore(&trc->lock, flags);
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return -1;
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}
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trc->rd_idx++;
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if (trc->rd_idx == trc->max_idx)
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trc->rd_idx = 0;
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spin_unlock_irqrestore(&trc->lock, flags);
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return snic_fmt_trc_data(td, buf, buf_sz);
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} /* end of snic_get_trc_data */
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/*
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* snic_trc_init() : Configures Trace Functionality for snic.
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*/
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int
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snic_trc_init(void)
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{
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struct snic_trc *trc = &snic_glob->trc;
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void *tbuf = NULL;
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int tbuf_sz = 0, ret;
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tbuf_sz = (snic_trace_max_pages * PAGE_SIZE);
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tbuf = vzalloc(tbuf_sz);
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if (!tbuf) {
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SNIC_ERR("Failed to Allocate Trace Buffer Size. %d\n", tbuf_sz);
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SNIC_ERR("Trace Facility not enabled.\n");
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ret = -ENOMEM;
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return ret;
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}
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trc->buf = (struct snic_trc_data *) tbuf;
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spin_lock_init(&trc->lock);
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snic_trc_debugfs_init();
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trc->max_idx = (tbuf_sz / SNIC_TRC_ENTRY_SZ);
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trc->rd_idx = trc->wr_idx = 0;
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trc->enable = true;
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SNIC_INFO("Trace Facility Enabled.\n Trace Buffer SZ %lu Pages.\n",
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tbuf_sz / PAGE_SIZE);
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ret = 0;
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return ret;
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} /* end of snic_trc_init */
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/*
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* snic_trc_free : Releases the trace buffer and disables the tracing.
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*/
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void
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snic_trc_free(void)
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{
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struct snic_trc *trc = &snic_glob->trc;
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trc->enable = false;
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snic_trc_debugfs_term();
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if (trc->buf) {
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vfree(trc->buf);
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trc->buf = NULL;
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}
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SNIC_INFO("Trace Facility Disabled.\n");
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} /* end of snic_trc_free */
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