cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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snic_trc.h (3286B)


      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
     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 snic_trace_max_pages;
     30
     31/* Global Data structure for trace to manage trace functionality */
     32struct 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
     42struct 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
     51int snic_trc_init(void);
     52void snic_trc_free(void);
     53void snic_trc_debugfs_init(void);
     54void snic_trc_debugfs_term(void);
     55struct snic_trc_data *snic_get_trc_buf(void);
     56int snic_get_trc_data(char *buf, int buf_sz);
     57
     58void snic_debugfs_init(void);
     59void snic_debugfs_term(void);
     60
     61static inline void
     62snic_trace(char *fn, u16 hno, u32 tag, u64 d1, u64 d2, u64 d3, u64 d4, u64 d5)
     63{
     64	struct snic_trc_data *tr_rec = snic_get_trc_buf();
     65
     66	if (!tr_rec)
     67		return;
     68
     69	tr_rec->fn = (char *)fn;
     70	tr_rec->hno = hno;
     71	tr_rec->tag = tag;
     72	tr_rec->data[0] = d1;
     73	tr_rec->data[1] = d2;
     74	tr_rec->data[2] = d3;
     75	tr_rec->data[3] = d4;
     76	tr_rec->data[4] = d5;
     77	tr_rec->ts = jiffies; /* Update time stamp at last */
     78}
     79
     80#define SNIC_TRC(_hno, _tag, d1, d2, d3, d4, d5)			\
     81	do {								\
     82		if (unlikely(snic_glob->trc.enable))			\
     83			snic_trace((char *)__func__,			\
     84				   (u16)(_hno),				\
     85				   (u32)(_tag),				\
     86				   (u64)(d1),				\
     87				   (u64)(d2),				\
     88				   (u64)(d3),				\
     89				   (u64)(d4),				\
     90				   (u64)(d5));				\
     91	} while (0)
     92#else
     93
     94#define SNIC_TRC(_hno, _tag, d1, d2, d3, d4, d5)	\
     95	do {						\
     96		if (unlikely(snic_log_level & 0x2))	\
     97			SNIC_DBG("SnicTrace: %s %2u %2u %llx %llx %llx %llx %llx", \
     98				 (char *)__func__,	\
     99				 (u16)(_hno),		\
    100				 (u32)(_tag),		\
    101				 (u64)(d1),		\
    102				 (u64)(d2),		\
    103				 (u64)(d3),		\
    104				 (u64)(d4),		\
    105				 (u64)(d5));		\
    106	} while (0)
    107#endif /* end of CONFIG_SCSI_SNIC_DEBUG_FS */
    108
    109#define SNIC_TRC_CMD(sc)	\
    110	((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |	\
    111	 (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |	\
    112	 (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |	\
    113	 (u64)sc->cmnd[5])
    114
    115#define SNIC_TRC_CMD_STATE_FLAGS(sc)	\
    116	((u64) CMD_FLAGS(sc) << 32 | CMD_STATE(sc))
    117
    118#endif /* end of __SNIC_TRC_H */