LXR linux/drivers/scsi/fnic/fnic

   1/*
   2 * Copyright 2012 Cisco Systems, Inc.  All rights reserved.
   3 *
   4 * This program is free software; you may redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; version 2 of the License.
   7 *
   8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15 * SOFTWARE.
  16 */
  17
  18#ifndef __FNIC_TRACE_H__
  19#define __FNIC_TRACE_H__
  20
  21#define FNIC_ENTRY_SIZE_BYTES 64
  22
  23extern ssize_t simple_read_from_buffer(void __user *to,
  24                                          size_t count,
  25                                          loff_t *ppos,
  26                                          const void *from,
  27                                          size_t available);
  28
  29extern unsigned int fnic_trace_max_pages;
  30extern int fnic_tracing_enabled;
  31extern unsigned int trace_max_pages;
  32
  33typedef struct fnic_trace_dbg {
  34        int wr_idx;
  35        int rd_idx;
  36        unsigned long *page_offset;
  37} fnic_trace_dbg_t;
  38
  39typedef struct fnic_dbgfs {
  40        int buffer_len;
  41        char *buffer;
  42} fnic_dbgfs_t;
  43
  44struct fnic_trace_data {
  45        union {
  46                struct {
  47                        u32 low;
  48                        u32 high;
  49                };
  50                u64 val;
  51        } timestamp, fnaddr;
  52        u32 host_no;
  53        u32 tag;
  54        u64 data[5];
  55} __attribute__((__packed__));
  56
  57typedef struct fnic_trace_data fnic_trace_data_t;
  58
  59#define FNIC_TRACE_ENTRY_SIZE \
  60                  (FNIC_ENTRY_SIZE_BYTES - sizeof(fnic_trace_data_t))
  61
  62#define FNIC_TRACE(_fn, _hn, _t, _a, _b, _c, _d, _e)           \
  63        if (unlikely(fnic_tracing_enabled)) {                   \
  64                fnic_trace_data_t *trace_buf = fnic_trace_get_buf(); \
  65                if (trace_buf) { \
  66                        if (sizeof(unsigned long) < 8) { \
  67                                trace_buf->timestamp.low = jiffies; \
  68                                trace_buf->fnaddr.low = (u32)(unsigned long)_fn; \
  69                        } else { \
  70                                trace_buf->timestamp.val = jiffies; \
  71                                trace_buf->fnaddr.val = (u64)(unsigned long)_fn; \
  72                        } \
  73                        trace_buf->host_no = _hn; \
  74                        trace_buf->tag = _t; \
  75                        trace_buf->data[0] = (u64)(unsigned long)_a; \
  76                        trace_buf->data[1] = (u64)(unsigned long)_b; \
  77                        trace_buf->data[2] = (u64)(unsigned long)_c; \
  78                        trace_buf->data[3] = (u64)(unsigned long)_d; \
  79                        trace_buf->data[4] = (u64)(unsigned long)_e; \
  80                } \
  81        }
  82
  83fnic_trace_data_t *fnic_trace_get_buf(void);
  84int fnic_get_trace_data(fnic_dbgfs_t *);
  85int fnic_trace_buf_init(void);
  86void fnic_trace_free(void);
  87int fnic_trace_debugfs_init(void);
  88void fnic_trace_debugfs_terminate(void);
  89
  90#endif
  91