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+/*
+ * Copyright 2014 Cisco Systems, Inc. All rights reserved.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/mempool.h>
+#include <linux/errno.h>
+
+#include "snic_io.h"
+#include "snic.h"
+#include "snic_os.h"
+
+/*
+ * snic_get_trc_buf : Allocates a trace record and returns.
+ */
+struct snic_trc_data *
+snic_get_trc_buf(void)
+{
+ struct snic_trc *trc = &snic_glob->trc;
+ struct snic_trc_data *td = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&trc->lock, flags);
+ td = &trc->buf[trc->wr_idx];
+ trc->wr_idx++;
+
+ if (trc->wr_idx == trc->max_idx)
+ trc->wr_idx = 0;
+
+ if (trc->wr_idx != trc->rd_idx) {
+ spin_unlock_irqrestore(&trc->lock, flags);
+
+ goto end;
+ }
+
+ trc->rd_idx++;
+ if (trc->rd_idx == trc->max_idx)
+ trc->rd_idx = 0;
+
+ td->ts = 0; /* Marker for checking the record, for complete data*/
+ spin_unlock_irqrestore(&trc->lock, flags);
+
+end:
+
+ return td;
+} /* end of snic_get_trc_buf */
+
+/*
+ * snic_fmt_trc_data : Formats trace data for printing.
+ */
+static int
+snic_fmt_trc_data(struct snic_trc_data *td, char *buf, int buf_sz)
+{
+ int len = 0;
+ struct timespec tmspec;
+
+ jiffies_to_timespec(td->ts, &tmspec);
+
+ len += snprintf(buf, buf_sz,
+ "%lu.%10lu %-25s %3d %4x %16llx %16llx %16llx %16llx %16llx\n",
+ tmspec.tv_sec,
+ tmspec.tv_nsec,
+ td->fn,
+ td->hno,
+ td->tag,
+ td->data[0], td->data[1], td->data[2], td->data[3],
+ td->data[4]);
+
+ return len;
+} /* end of snic_fmt_trc_data */
+
+/*
+ * snic_get_trc_data : Returns a formatted trace buffer.
+ */
+int
+snic_get_trc_data(char *buf, int buf_sz)
+{
+ struct snic_trc_data *td = NULL;
+ struct snic_trc *trc = &snic_glob->trc;
+ unsigned long flags;
+
+ spin_lock_irqsave(&trc->lock, flags);
+ if (trc->rd_idx == trc->wr_idx) {
+ spin_unlock_irqrestore(&trc->lock, flags);
+
+ return -1;
+ }
+ td = &trc->buf[trc->rd_idx];
+
+ if (td->ts == 0) {
+ /* write in progress. */
+ spin_unlock_irqrestore(&trc->lock, flags);
+
+ return -1;
+ }
+
+ trc->rd_idx++;
+ if (trc->rd_idx == trc->max_idx)
+ trc->rd_idx = 0;
+ spin_unlock_irqrestore(&trc->lock, flags);
+
+ return snic_fmt_trc_data(td, buf, buf_sz);
+} /* end of snic_get_trc_data */
+
+/*
+ * snic_trc_init() : Configures Trace Functionality for snic.
+ */
+int
+snic_trc_init(void)
+{
+ struct snic_trc *trc = &snic_glob->trc;
+ void *tbuf = NULL;
+ int tbuf_sz = 0, ret;
+
+ BUILD_BUG_ON(sizeof(struct snic_trc_data) != 64);
+
+ tbuf_sz = (snic_trace_max_pages * PAGE_SIZE);
+ tbuf = vmalloc(tbuf_sz);
+ if (!tbuf) {
+ SNIC_ERR("Failed to Allocate Trace Buffer Size. %d\n", tbuf_sz);
+ SNIC_ERR("Trace Facility not enabled.\n");
+ ret = -ENOMEM;
+
+ return ret;
+ }
+
+ memset(tbuf, 0, tbuf_sz);
+ trc->buf = (struct snic_trc_data *) tbuf;
+ spin_lock_init(&trc->lock);
+
+ ret = snic_trc_debugfs_init();
+ if (ret) {
+ SNIC_ERR("Failed to create Debugfs Files.\n");
+
+ goto error;
+ }
+
+ trc->max_idx = (tbuf_sz / SNIC_TRC_ENTRY_SZ);
+ trc->rd_idx = trc->wr_idx = 0;
+ trc->enable = 1;
+ SNIC_INFO("Trace Facility Enabled.\n Trace Buffer SZ %lu Pages.\n",
+ tbuf_sz / PAGE_SIZE);
+ ret = 0;
+
+ return ret;
+
+error:
+ snic_trc_free();
+
+ return ret;
+} /* end of snic_trc_init */
+
+/*
+ * snic_trc_free : Releases the trace buffer and disables the tracing.
+ */
+void
+snic_trc_free(void)
+{
+ struct snic_trc *trc = &snic_glob->trc;
+
+ trc->enable = 0;
+ snic_trc_debugfs_term();
+
+ if (trc->buf) {
+ vfree(trc->buf);
+ trc->buf = NULL;
+ }
+
+ SNIC_INFO("Trace Facility Disabled.\n");
+} /* end of snic_trc_free */
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+/*
+ * Copyright 2014 Cisco Systems, Inc. All rights reserved.
+ *
+ * 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.
+ */
+
+#ifndef __SNIC_TRC_H
+#define __SNIC_TRC_H
+
+#ifdef SNIC_DEBUG_FS
+
+extern ssize_t simple_read_from_buffer(void __user *to,
+ size_t count,
+ loff_t *ppos,
+ const void *from,
+ size_t available);
+
+extern unsigned int snic_trace_max_pages;
+
+/* Global Data structure for trace to manage trace functionality */
+struct snic_trc_data {
+ u64 ts; /* Time Stamp */
+ char *fn; /* Ptr to Function Name */
+ u32 hno; /* SCSI Host ID */
+ u32 tag; /* Command Tag */
+ u64 data[5];
+} __attribute__((__packed__));
+
+#define SNIC_TRC_ENTRY_SZ 64 /* in Bytes */
+
+struct snic_trc {
+ spinlock_t lock;
+ struct snic_trc_data *buf; /* Trace Buffer */
+ u32 max_idx; /* Max Index into trace buffer */
+ u32 rd_idx;
+ u32 wr_idx;
+ u32 enable; /* Control Variable for Tracing */
+
+ struct dentry *trc_enable; /* debugfs file object */
+ struct dentry *trc_file;
+};
+
+int snic_trc_init(void);
+void snic_trc_free(void);
+int snic_trc_debugfs_init(void);
+void snic_trc_debugfs_term(void);
+struct snic_trc_data *snic_get_trc_buf(void);
+int snic_get_trc_data(char *buf, int buf_sz);
+
+int snic_debugfs_init(void);
+void snic_debugfs_term(void);
+
+static inline void
+snic_trace(char *fn, u16 hno, u32 tag, u64 d1, u64 d2, u64 d3, u64 d4, u64 d5)
+{
+ struct snic_trc_data *tr_rec = snic_get_trc_buf();
+
+ if (!tr_rec)
+ return;
+
+ tr_rec->fn = (char *)fn;
+ tr_rec->hno = hno;
+ tr_rec->tag = tag;
+ tr_rec->data[0] = d1;
+ tr_rec->data[1] = d2;
+ tr_rec->data[2] = d3;
+ tr_rec->data[3] = d4;
+ tr_rec->data[4] = d5;
+ tr_rec->ts = jiffies; /* Update time stamp at last */
+}
+
+#define SNIC_TRC(_hno, _tag, d1, d2, d3, d4, d5) \
+ do { \
+ if (unlikely(snic_glob->trc.enable)) \
+ snic_trace((char *)__func__, \
+ (u16)(_hno), \
+ (u32)(_tag), \
+ (u64)(d1), \
+ (u64)(d2), \
+ (u64)(d3), \
+ (u64)(d4), \
+ (u64)(d5)); \
+ } while (0)
+#else
+
+#define SNIC_TRC(_hno, _tag, d1, d2, d3, d4, d5) \
+ do { \
+ if (unlikely(snic_log_level & 0x2)) \
+ SNIC_DBG("SnicTrace: %s %2u %2u %llx %llx %llx %llx %llx", \
+ (char *)__func__, \
+ (u16)(_hno), \
+ (u32)(_tag), \
+ (u64)(d1), \
+ (u64)(d2), \
+ (u64)(d3), \
+ (u64)(d4), \
+ (u64)(d5)); \
+ } while (0);
+#endif /* end of SNIC_DEBUG_FS */
+
+#define SNIC_TRC_CMD(sc) \
+ ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 | \
+ (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 | \
+ (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 | \
+ (u64)sc->cmnd[5])
+
+#define SNIC_TRC_CMD_STATE_FLAGS(sc) \
+ ((u64) CMD_FLAGS(sc) << 32 | CMD_STATE(sc))
+
+#endif /* end of __SNIC_TRC_H */