granicus.if.org Git - strace/blob - sg_io_v3.c

   1 /*
   2  * Copyright (c) 2007 Vladimir Nadvornik <nadvornik@suse.cz>
   3  * Copyright (c) 2007-2018 Dmitry V. Levin <ldv@altlinux.org>
   4  * Copyright (c) 2015 Bart Van Assche <bart.vanassche@sandisk.com>
   5  * All rights reserved.
   6  *
   7  * SPDX-License-Identifier: LGPL-2.1-or-later
   8  */
   9
  10 #include "defs.h"
  11
  12 #ifdef HAVE_SCSI_SG_H
  13
  14 # include DEF_MPERS_TYPE(struct_sg_io_hdr)
  15
  16 # include <scsi/sg.h>
  17
  18 typedef struct sg_io_hdr struct_sg_io_hdr;
  19
  20 #endif /* HAVE_SCSI_SG_H */
  21
  22 #include MPERS_DEFS
  23
  24 #include "xlat/sg_io_info.h"
  25
  26 #ifdef HAVE_SCSI_SG_H
  27 # include "print_fields.h"
  28 # include "xlat/sg_io_dxfer_direction.h"
  29 # include "xlat/sg_io_flags.h"
  30
  31 static void
  32 print_sg_io_buffer(struct tcb *const tcp, const kernel_ulong_t addr,
  33                    const unsigned int data_size, const unsigned int iovec_count)
  34 {
  35         if (iovec_count) {
  36                 tprint_iov_upto(tcp, iovec_count, addr, IOV_DECODE_STR,
  37                                 data_size);
  38         } else {
  39                 printstr_ex(tcp, addr, data_size, QUOTE_FORCE_HEX);
  40         }
  41 }
  42
  43 # define PRINT_FIELD_SG_IO_BUFFER(prefix_, where_, field_, size_, count_, tcp_) \
  44         do {                                                                    \
  45                 STRACE_PRINTF("%s%s=", (prefix_), #field_);                     \
  46                 print_sg_io_buffer((tcp_), (mpers_ptr_t)((where_).field_),      \
  47                                    (size_), (count_));                          \
  48         } while (0)
  49
  50 static int
  51 decode_request(struct tcb *const tcp, const kernel_ulong_t arg)
  52 {
  53         struct_sg_io_hdr sg_io;
  54         static const size_t skip_iid =
  55                 offsetof(struct_sg_io_hdr, dxfer_direction);
  56
  57         tprints("{interface_id='S', ");
  58         if (umoven_or_printaddr(tcp, arg + skip_iid, sizeof(sg_io) - skip_iid,
  59                                 &sg_io.dxfer_direction)) {
  60                 tprints("}");
  61                 return RVAL_IOCTL_DECODED;
  62         }
  63
  64         PRINT_FIELD_XVAL("", sg_io, dxfer_direction, sg_io_dxfer_direction,
  65                          "SG_DXFER_???");
  66         PRINT_FIELD_U(", ", sg_io, cmd_len);
  67         PRINT_FIELD_SG_IO_BUFFER(", ", sg_io, cmdp, sg_io.cmd_len, 0, tcp);
  68         PRINT_FIELD_U(", ", sg_io, mx_sb_len);
  69         PRINT_FIELD_U(", ", sg_io, iovec_count);
  70         PRINT_FIELD_U(", ", sg_io, dxfer_len);
  71         PRINT_FIELD_U(", ", sg_io, timeout);
  72         PRINT_FIELD_FLAGS(", ", sg_io, flags, sg_io_flags, "SG_FLAG_???");
  73
  74         if (sg_io.dxfer_direction == SG_DXFER_TO_DEV ||
  75             sg_io.dxfer_direction == SG_DXFER_TO_FROM_DEV) {
  76                 PRINT_FIELD_SG_IO_BUFFER(", ", sg_io, dxferp, sg_io.dxfer_len, sg_io.iovec_count, tcp);
  77         }
  78
  79         struct_sg_io_hdr *entering_sg_io = malloc(sizeof(*entering_sg_io));
  80         if (entering_sg_io) {
  81                 memcpy(entering_sg_io, &sg_io, sizeof(sg_io));
  82                 entering_sg_io->interface_id = (unsigned char) 'S';
  83                 set_tcb_priv_data(tcp, entering_sg_io, free);
  84         }
  85
  86         return 0;
  87 }
  88
  89 static int
  90 decode_response(struct tcb *const tcp, const kernel_ulong_t arg)
  91 {
  92         struct_sg_io_hdr *entering_sg_io = get_tcb_priv_data(tcp);
  93         struct_sg_io_hdr sg_io;
  94
  95         if (umove(tcp, arg, &sg_io) < 0) {
  96                 /* print i/o fields fetched on entering syscall */
  97                 if (entering_sg_io->dxfer_direction == SG_DXFER_FROM_DEV)
  98                         PRINT_FIELD_PTR(", ", *entering_sg_io, dxferp);
  99                 PRINT_FIELD_PTR(", ", *entering_sg_io, sbp);
 100                 return RVAL_IOCTL_DECODED;
 101         }
 102
 103         if (sg_io.interface_id != entering_sg_io->interface_id) {
 104                 PRINT_FIELD_U(" => ", sg_io, interface_id);
 105                 return RVAL_IOCTL_DECODED;
 106         }
 107
 108         if (sg_io.dxfer_direction == SG_DXFER_FROM_DEV ||
 109             sg_io.dxfer_direction == SG_DXFER_TO_FROM_DEV) {
 110                 uint32_t din_len = sg_io.dxfer_len;
 111                 const char *prefix = NULL;
 112
 113                 if (sg_io.resid > 0 && (unsigned int) sg_io.resid <= din_len)
 114                         din_len -= sg_io.resid;
 115
 116                 if (sg_io.dxfer_direction == SG_DXFER_FROM_DEV)
 117                         prefix = ", ";
 118                 else if (din_len)
 119                         prefix = " => ";
 120
 121                 if (prefix) {
 122                         tprints(prefix);
 123                         PRINT_FIELD_SG_IO_BUFFER("", sg_io, dxferp, din_len,
 124                                                  sg_io.iovec_count, tcp);
 125                 }
 126         }
 127         PRINT_FIELD_X(", ", sg_io, status);
 128         PRINT_FIELD_X(", ", sg_io, masked_status);
 129         PRINT_FIELD_X(", ", sg_io, msg_status);
 130         PRINT_FIELD_U(", ", sg_io, sb_len_wr);
 131         PRINT_FIELD_SG_IO_BUFFER(", ", sg_io, sbp, sg_io.sb_len_wr, 0, tcp);
 132         PRINT_FIELD_X(", ", sg_io, host_status);
 133         PRINT_FIELD_X(", ", sg_io, driver_status);
 134         PRINT_FIELD_D(", ", sg_io, resid);
 135         PRINT_FIELD_U(", ", sg_io, duration);
 136         PRINT_FIELD_FLAGS(", ", sg_io, info, sg_io_info, "SG_INFO_???");
 137
 138         return RVAL_IOCTL_DECODED;
 139 }
 140
 141 #else /* !HAVE_SCSI_SG_H */
 142
 143 static int
 144 decode_request(struct tcb *const tcp, const kernel_ulong_t arg)
 145 {
 146         tprints("{interface_id='S', ...}");
 147         return RVAL_IOCTL_DECODED;
 148 }
 149
 150 static int
 151 decode_response(struct tcb *const tcp, const kernel_ulong_t arg)
 152 {
 153         return 0;
 154 }
 155
 156 #endif
 157
 158 MPERS_PRINTER_DECL(int, decode_sg_io_v3,
 159                    struct tcb *const tcp, const kernel_ulong_t arg)
 160 {
 161         return entering(tcp) ? decode_request(tcp, arg)
 162                              : decode_response(tcp, arg);
 163 }