drivers/scsi/fnic/fnic_trace.h

   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
  23 extern 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
  29 extern unsigned int fnic_trace_max_pages;
  30 extern int fnic_tracing_enabled;
  31 extern unsigned int trace_max_pages;
  32
  33 typedef struct fnic_trace_dbg {
  34         int wr_idx;
  35         int rd_idx;
  36         unsigned long *page_offset;
  37 } fnic_trace_dbg_t;
  38
  39 typedef struct fnic_dbgfs {
  40         int buffer_len;
  41         char *buffer;
  42 } fnic_dbgfs_t;
  43
  44 struct 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
  57 typedef 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
  83 fnic_trace_data_t *fnic_trace_get_buf(void);
  84 int fnic_get_trace_data(fnic_dbgfs_t *);
  85 int fnic_trace_buf_init(void);
  86 void fnic_trace_free(void);
  87 int fnic_debugfs_init(void);
  88 void fnic_debugfs_terminate(void);
  89 int fnic_trace_debugfs_init(void);
  90 void fnic_trace_debugfs_terminate(void);
  91 #endif