diff options
Diffstat (limited to 'kernel/include/scsi/scsi_eh.h')
| -rw-r--r-- | kernel/include/scsi/scsi_eh.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/kernel/include/scsi/scsi_eh.h b/kernel/include/scsi/scsi_eh.h new file mode 100644 index 000000000..5a4bb5bb6 --- /dev/null +++ b/kernel/include/scsi/scsi_eh.h @@ -0,0 +1,88 @@ +#ifndef _SCSI_SCSI_EH_H +#define _SCSI_SCSI_EH_H + +#include <linux/scatterlist.h> + +#include <scsi/scsi_cmnd.h> +struct scsi_device; +struct Scsi_Host; + +/* + * This is a slightly modified SCSI sense "descriptor" format header. + * The addition is to allow the 0x70 and 0x71 response codes. The idea + * is to place the salient data from either "fixed" or "descriptor" sense + * format into one structure to ease application processing. + * + * The original sense buffer should be kept around for those cases + * in which more information is required (e.g. the LBA of a MEDIUM ERROR). + */ +struct scsi_sense_hdr { /* See SPC-3 section 4.5 */ + u8 response_code; /* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */ + u8 sense_key; + u8 asc; + u8 ascq; + u8 byte4; + u8 byte5; + u8 byte6; + u8 additional_length; /* always 0 for fixed sense format */ +}; + +static inline bool scsi_sense_valid(const struct scsi_sense_hdr *sshdr) +{ + if (!sshdr) + return false; + + return (sshdr->response_code & 0x70) == 0x70; +} + + +extern void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, + struct list_head *done_q); +extern void scsi_eh_flush_done_q(struct list_head *done_q); +extern void scsi_report_bus_reset(struct Scsi_Host *, int); +extern void scsi_report_device_reset(struct Scsi_Host *, int, int); +extern int scsi_block_when_processing_errors(struct scsi_device *); +extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len, + struct scsi_sense_hdr *sshdr); +extern bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd, + struct scsi_sense_hdr *sshdr); + +static inline bool scsi_sense_is_deferred(const struct scsi_sense_hdr *sshdr) +{ + return ((sshdr->response_code >= 0x70) && (sshdr->response_code & 1)); +} + +extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, + int desc_type); + +extern int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, + u64 * info_out); + +extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq); +extern void scsi_set_sense_information(u8 *buf, u64 info); + +extern int scsi_ioctl_reset(struct scsi_device *, int __user *); + +struct scsi_eh_save { + /* saved state */ + int result; + enum dma_data_direction data_direction; + unsigned underflow; + unsigned char cmd_len; + unsigned char prot_op; + unsigned char *cmnd; + struct scsi_data_buffer sdb; + struct request *next_rq; + /* new command support */ + unsigned char eh_cmnd[BLK_MAX_CDB]; + struct scatterlist sense_sgl; +}; + +extern void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, + struct scsi_eh_save *ses, unsigned char *cmnd, + int cmnd_size, unsigned sense_bytes); + +extern void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, + struct scsi_eh_save *ses); + +#endif /* _SCSI_SCSI_EH_H */ |