kernel/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 #define FC_TRC_SIZE_BYTES 256
  23 #define FC_TRC_HEADER_SIZE sizeof(struct fc_trace_hdr)
  24
  25 /*
  26  * Fisrt bit of FNIC_FC_RECV and FNIC_FC_SEND is used to represent the type
  27  * of frame 1 => Eth frame, 0=> FC frame
  28  */
  29
  30 #define FNIC_FC_RECV 0x52 /* Character R */
  31 #define FNIC_FC_SEND 0x54 /* Character T */
  32 #define FNIC_FC_LE 0x4C /* Character L */
  33
  34 extern ssize_t simple_read_from_buffer(void __user *to,
  35                                           size_t count,
  36                                           loff_t *ppos,
  37                                           const void *from,
  38                                           size_t available);
  39
  40 extern unsigned int fnic_trace_max_pages;
  41 extern int fnic_tracing_enabled;
  42 extern unsigned int trace_max_pages;
  43
  44 extern unsigned int fnic_fc_trace_max_pages;
  45 extern int fnic_fc_tracing_enabled;
  46 extern int fnic_fc_trace_cleared;
  47
  48 typedef struct fnic_trace_dbg {
  49         int wr_idx;
  50         int rd_idx;
  51         unsigned long *page_offset;
  52 } fnic_trace_dbg_t;
  53
  54 typedef struct fnic_dbgfs {
  55         int buffer_len;
  56         char *buffer;
  57 } fnic_dbgfs_t;
  58
  59 struct fnic_trace_data {
  60         union {
  61                 struct {
  62                         u32 low;
  63                         u32 high;
  64                 };
  65                 u64 val;
  66         } timestamp, fnaddr;
  67         u32 host_no;
  68         u32 tag;
  69         u64 data[5];
  70 } __attribute__((__packed__));
  71
  72 typedef struct fnic_trace_data fnic_trace_data_t;
  73
  74 struct fc_trace_hdr {
  75         struct timespec time_stamp;
  76         u32 host_no;
  77         u8 frame_type;
  78         u8 frame_len;
  79 } __attribute__((__packed__));
  80
  81 #define FC_TRACE_ADDRESS(a) \
  82         ((unsigned long)(a) + sizeof(struct fc_trace_hdr))
  83
  84 #define FNIC_TRACE_ENTRY_SIZE \
  85                   (FNIC_ENTRY_SIZE_BYTES - sizeof(fnic_trace_data_t))
  86
  87 #define FNIC_TRACE(_fn, _hn, _t, _a, _b, _c, _d, _e)           \
  88         if (unlikely(fnic_tracing_enabled)) {                   \
  89                 fnic_trace_data_t *trace_buf = fnic_trace_get_buf(); \
  90                 if (trace_buf) { \
  91                         if (sizeof(unsigned long) < 8) { \
  92                                 trace_buf->timestamp.low = jiffies; \
  93                                 trace_buf->fnaddr.low = (u32)(unsigned long)_fn; \
  94                         } else { \
  95                                 trace_buf->timestamp.val = jiffies; \
  96                                 trace_buf->fnaddr.val = (u64)(unsigned long)_fn; \
  97                         } \
  98                         trace_buf->host_no = _hn; \
  99                         trace_buf->tag = _t; \
 100                         trace_buf->data[0] = (u64)(unsigned long)_a; \
 101                         trace_buf->data[1] = (u64)(unsigned long)_b; \
 102                         trace_buf->data[2] = (u64)(unsigned long)_c; \
 103                         trace_buf->data[3] = (u64)(unsigned long)_d; \
 104                         trace_buf->data[4] = (u64)(unsigned long)_e; \
 105                 } \
 106         }
 107
 108 fnic_trace_data_t *fnic_trace_get_buf(void);
 109 int fnic_get_trace_data(fnic_dbgfs_t *);
 110 int fnic_trace_buf_init(void);
 111 void fnic_trace_free(void);
 112 int fnic_debugfs_init(void);
 113 void fnic_debugfs_terminate(void);
 114 int fnic_trace_debugfs_init(void);
 115 void fnic_trace_debugfs_terminate(void);
 116
 117 /* Fnic FC CTLR Trace releated function */
 118 int fnic_fc_trace_init(void);
 119 void fnic_fc_trace_free(void);
 120 int fnic_fc_trace_set_data(u32 host_no, u8 frame_type,
 121                                 char *frame, u32 fc_frame_len);
 122 int fnic_fc_trace_get_data(fnic_dbgfs_t *fnic_dbgfs_prt, u8 rdata_flag);
 123 void copy_and_format_trace_data(struct fc_trace_hdr *tdata,
 124                                 fnic_dbgfs_t *fnic_dbgfs_prt,
 125                                 int *len, u8 rdata_flag);
 126 int fnic_fc_trace_debugfs_init(void);
 127 void fnic_fc_trace_debugfs_terminate(void);
 128
 129 #endif