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![Arnd Bergmann](/assets/img/avatar_default.png)
We don't want to use 'struct timespec' because of the y2038 overflow problem. The overflow is not actually an issue here, but it's easy to replace with 'timespec64' for consistency. However, it's worth pointing out that nanosecond values have nine digits, not eight or ten, so I'm fixing the format strings accordingly as well. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
181 lines
3.9 KiB
C
181 lines
3.9 KiB
C
/*
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* Copyright 2014 Cisco Systems, Inc. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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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 = vmalloc(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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memset(tbuf, 0, tbuf_sz);
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trc->buf = (struct snic_trc_data *) tbuf;
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spin_lock_init(&trc->lock);
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ret = snic_trc_debugfs_init();
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if (ret) {
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SNIC_ERR("Failed to create Debugfs Files.\n");
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goto error;
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}
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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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error:
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snic_trc_free();
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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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