ee7863bc68
libata needs to invoke EH without scmd. This patch adds shost->host_eh_scheduled to implement such behavior. Currently the only user of this feature is libata and no general interface is defined. This patch simply adds handling for host_eh_scheduled where needed and exports scsi_eh_wakeup() to modules. The rest is upto libata. This is the result of the following discussion. http://thread.gmane.org/gmane.linux.scsi/23853/focus=9760 In short, SCSI host is not supposed to know about exceptions unrelated to specific device or command. Such exceptions should be handled by transport layer proper. However, the distinction is not essential to ATA and libata is planning to depart from SCSI, so, for the time being, libata will be using SCSI EH to handle such exceptions. Signed-off-by: Tejun Heo <htejun@gmail.com>
73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
#ifndef _SCSI_SCSI_EH_H
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#define _SCSI_SCSI_EH_H
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struct scsi_cmnd;
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struct scsi_device;
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struct scsi_request;
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struct Scsi_Host;
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/*
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* This is a slightly modified SCSI sense "descriptor" format header.
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* The addition is to allow the 0x70 and 0x71 response codes. The idea
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* is to place the salient data from either "fixed" or "descriptor" sense
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* format into one structure to ease application processing.
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*
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* The original sense buffer should be kept around for those cases
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* in which more information is required (e.g. the LBA of a MEDIUM ERROR).
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*/
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struct scsi_sense_hdr { /* See SPC-3 section 4.5 */
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u8 response_code; /* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
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u8 sense_key;
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u8 asc;
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u8 ascq;
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u8 byte4;
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u8 byte5;
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u8 byte6;
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u8 additional_length; /* always 0 for fixed sense format */
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};
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static inline int scsi_sense_valid(struct scsi_sense_hdr *sshdr)
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{
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if (!sshdr)
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return 0;
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return (sshdr->response_code & 0x70) == 0x70;
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}
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extern void scsi_eh_wakeup(struct Scsi_Host *shost);
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extern void scsi_eh_finish_cmd(struct scsi_cmnd *scmd,
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struct list_head *done_q);
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extern void scsi_eh_flush_done_q(struct list_head *done_q);
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extern void scsi_report_bus_reset(struct Scsi_Host *, int);
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extern void scsi_report_device_reset(struct Scsi_Host *, int, int);
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extern int scsi_block_when_processing_errors(struct scsi_device *);
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extern int scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
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struct scsi_sense_hdr *sshdr);
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extern int scsi_request_normalize_sense(struct scsi_request *sreq,
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struct scsi_sense_hdr *sshdr);
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extern int scsi_command_normalize_sense(struct scsi_cmnd *cmd,
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struct scsi_sense_hdr *sshdr);
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static inline int scsi_sense_is_deferred(struct scsi_sense_hdr *sshdr)
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{
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return ((sshdr->response_code >= 0x70) && (sshdr->response_code & 1));
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}
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extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
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int desc_type);
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extern int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
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u64 * info_out);
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/*
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* Reset request from external source
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*/
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#define SCSI_TRY_RESET_DEVICE 1
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#define SCSI_TRY_RESET_BUS 2
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#define SCSI_TRY_RESET_HOST 3
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extern int scsi_reset_provider(struct scsi_device *, int);
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#endif /* _SCSI_SCSI_EH_H */
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