kernel/drivers/scsi/snic/snic_trc.h

   1 /*
   2  * Copyright 2014 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 __SNIC_TRC_H
  19 #define __SNIC_TRC_H
  20
  21 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS
  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 snic_trace_max_pages;
  30
  31 /* Global Data structure for trace to manage trace functionality */
  32 struct snic_trc_data {
  33         u64     ts;             /* Time Stamp */
  34         char    *fn;            /* Ptr to Function Name */
  35         u32     hno;            /* SCSI Host ID */
  36         u32     tag;            /* Command Tag */
  37         u64 data[5];
  38 } __attribute__((__packed__));
  39
  40 #define SNIC_TRC_ENTRY_SZ  64   /* in Bytes */
  41
  42 struct snic_trc {
  43         spinlock_t lock;
  44         struct snic_trc_data *buf;      /* Trace Buffer */
  45         u32     max_idx;                /* Max Index into trace buffer */
  46         u32     rd_idx;
  47         u32     wr_idx;
  48         bool    enable;                 /* Control Variable for Tracing */
  49
  50         struct dentry *trc_enable;      /* debugfs file object */
  51         struct dentry *trc_file;
  52 };
  53
  54 int snic_trc_init(void);
  55 void snic_trc_free(void);
  56 int snic_trc_debugfs_init(void);
  57 void snic_trc_debugfs_term(void);
  58 struct snic_trc_data *snic_get_trc_buf(void);
  59 int snic_get_trc_data(char *buf, int buf_sz);
  60
  61 int snic_debugfs_init(void);
  62 void snic_debugfs_term(void);
  63
  64 static inline void
  65 snic_trace(char *fn, u16 hno, u32 tag, u64 d1, u64 d2, u64 d3, u64 d4, u64 d5)
  66 {
  67         struct snic_trc_data *tr_rec = snic_get_trc_buf();
  68
  69         if (!tr_rec)
  70                 return;
  71
  72         tr_rec->fn = (char *)fn;
  73         tr_rec->hno = hno;
  74         tr_rec->tag = tag;
  75         tr_rec->data[0] = d1;
  76         tr_rec->data[1] = d2;
  77         tr_rec->data[2] = d3;
  78         tr_rec->data[3] = d4;
  79         tr_rec->data[4] = d5;
  80         tr_rec->ts = jiffies; /* Update time stamp at last */
  81 }
  82
  83 #define SNIC_TRC(_hno, _tag, d1, d2, d3, d4, d5)                        \
  84         do {                                                            \
  85                 if (unlikely(snic_glob->trc.enable))                    \
  86                         snic_trace((char *)__func__,                    \
  87                                    (u16)(_hno),                         \
  88                                    (u32)(_tag),                         \
  89                                    (u64)(d1),                           \
  90                                    (u64)(d2),                           \
  91                                    (u64)(d3),                           \
  92                                    (u64)(d4),                           \
  93                                    (u64)(d5));                          \
  94         } while (0)
  95 #else
  96
  97 #define SNIC_TRC(_hno, _tag, d1, d2, d3, d4, d5)        \
  98         do {                                            \
  99                 if (unlikely(snic_log_level & 0x2))     \
 100                         SNIC_DBG("SnicTrace: %s %2u %2u %llx %llx %llx %llx %llx", \
 101                                  (char *)__func__,      \
 102                                  (u16)(_hno),           \
 103                                  (u32)(_tag),           \
 104                                  (u64)(d1),             \
 105                                  (u64)(d2),             \
 106                                  (u64)(d3),             \
 107                                  (u64)(d4),             \
 108                                  (u64)(d5));            \
 109         } while (0)
 110 #endif /* end of CONFIG_SCSI_SNIC_DEBUG_FS */
 111
 112 #define SNIC_TRC_CMD(sc)        \
 113         ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |      \
 114          (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |      \
 115          (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |       \
 116          (u64)sc->cmnd[5])
 117
 118 #define SNIC_TRC_CMD_STATE_FLAGS(sc)    \
 119         ((u64) CMD_FLAGS(sc) << 32 | CMD_STATE(sc))
 120
 121 #endif /* end of __SNIC_TRC_H */