scsi_transport.h 3.6 KB

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  1. /*
  2. * Transport specific attributes.
  3. *
  4. * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
  5. *
  6. * This program is free software; you can redistribute it and/or modify
  7. * it under the terms of the GNU General Public License as published by
  8. * the Free Software Foundation; either version 2 of the License, or
  9. * (at your option) any later version.
  10. *
  11. * This program is distributed in the hope that it will be useful,
  12. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14. * GNU General Public License for more details.
  15. *
  16. * You should have received a copy of the GNU General Public License
  17. * along with this program; if not, write to the Free Software
  18. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19. */
  20. #ifndef SCSI_TRANSPORT_H
  21. #define SCSI_TRANSPORT_H
  22. #include <linux/transport_class.h>
  23. #include <scsi/scsi_host.h>
  24. #include <scsi/scsi_device.h>
  25. struct scsi_transport_template {
  26. /* the attribute containers */
  27. struct transport_container host_attrs;
  28. struct transport_container target_attrs;
  29. struct transport_container device_attrs;
  30. /*
  31. * If set, called from sysfs and legacy procfs rescanning code.
  32. */
  33. int (*user_scan)(struct Scsi_Host *, uint, uint, uint);
  34. /* The size of the specific transport attribute structure (a
  35. * space of this size will be left at the end of the
  36. * scsi_* structure */
  37. int device_size;
  38. int device_private_offset;
  39. int target_size;
  40. int target_private_offset;
  41. int host_size;
  42. /* no private offset for the host; there's an alternative mechanism */
  43. /*
  44. * True if the transport wants to use a host-based work-queue
  45. */
  46. unsigned int create_work_queue : 1;
  47. /*
  48. * Allows a transport to override the default error handler.
  49. */
  50. void (* eh_strategy_handler)(struct Scsi_Host *);
  51. /*
  52. * This is an optional routine that allows the transport to become
  53. * involved when a scsi io timer fires. The return value tells the
  54. * timer routine how to finish the io timeout handling:
  55. * EH_HANDLED: I fixed the error, please complete the command
  56. * EH_RESET_TIMER: I need more time, reset the timer and
  57. * begin counting again
  58. * EH_NOT_HANDLED Begin normal error recovery
  59. */
  60. enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
  61. };
  62. #define transport_class_to_shost(tc) \
  63. dev_to_shost((tc)->dev)
  64. /* Private area maintenance. The driver requested allocations come
  65. * directly after the transport class allocations (if any). The idea
  66. * is that you *must* call these only once. The code assumes that the
  67. * initial values are the ones the transport specific code requires */
  68. static inline void
  69. scsi_transport_reserve_target(struct scsi_transport_template * t, int space)
  70. {
  71. BUG_ON(t->target_private_offset != 0);
  72. t->target_private_offset = ALIGN(t->target_size, sizeof(void *));
  73. t->target_size = t->target_private_offset + space;
  74. }
  75. static inline void
  76. scsi_transport_reserve_device(struct scsi_transport_template * t, int space)
  77. {
  78. BUG_ON(t->device_private_offset != 0);
  79. t->device_private_offset = ALIGN(t->device_size, sizeof(void *));
  80. t->device_size = t->device_private_offset + space;
  81. }
  82. static inline void *
  83. scsi_transport_target_data(struct scsi_target *starget)
  84. {
  85. struct Scsi_Host *shost = dev_to_shost(&starget->dev);
  86. return (u8 *)starget->starget_data
  87. + shost->transportt->target_private_offset;
  88. }
  89. static inline void *
  90. scsi_transport_device_data(struct scsi_device *sdev)
  91. {
  92. struct Scsi_Host *shost = sdev->host;
  93. return (u8 *)sdev->sdev_data
  94. + shost->transportt->device_private_offset;
  95. }
  96. #endif /* SCSI_TRANSPORT_H */