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-rw-r--r--drivers/scsi/snic/snic_trc.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/scsi/snic/snic_trc.c b/drivers/scsi/snic/snic_trc.c
new file mode 100644
index 000000000..c2e5ab7e9
--- /dev/null
+++ b/drivers/scsi/snic/snic_trc.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright 2014 Cisco Systems, Inc. All rights reserved.
+
+#include <linux/module.h>
+#include <linux/mempool.h>
+#include <linux/errno.h>
+#include <linux/vmalloc.h>
+
+#include "snic_io.h"
+#include "snic.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 timespec64 tmspec;
+
+ jiffies_to_timespec64(td->ts, &tmspec);
+
+ len += snprintf(buf, buf_sz,
+ "%llu.%09lu %-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;
+
+ tbuf_sz = (snic_trace_max_pages * PAGE_SIZE);
+ tbuf = vzalloc(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;
+ }
+
+ trc->buf = (struct snic_trc_data *) tbuf;
+ spin_lock_init(&trc->lock);
+
+ snic_trc_debugfs_init();
+
+ trc->max_idx = (tbuf_sz / SNIC_TRC_ENTRY_SZ);
+ trc->rd_idx = trc->wr_idx = 0;
+ trc->enable = true;
+ SNIC_INFO("Trace Facility Enabled.\n Trace Buffer SZ %lu Pages.\n",
+ tbuf_sz / PAGE_SIZE);
+ ret = 0;
+
+ 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 = false;
+ snic_trc_debugfs_term();
+
+ if (trc->buf) {
+ vfree(trc->buf);
+ trc->buf = NULL;
+ }
+
+ SNIC_INFO("Trace Facility Disabled.\n");
+} /* end of snic_trc_free */