![Bart Van Assche](/assets/img/avatar_default.png)
Move the functions that are used by both the initiator and target subsystems into scsi_common.c/.h. This change will allow to remove the initiator SCSI header include directives from most SCSI target source files in a later patch. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: James Bottomley <JBottomley@Odin.com>
179 lines
4.7 KiB
C
179 lines
4.7 KiB
C
/*
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* SCSI functions used by both the initiator and the target code.
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*/
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#include <linux/bug.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <scsi/scsi_common.h>
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/* NB: These are exposed through /proc/scsi/scsi and form part of the ABI.
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* You may not alter any existing entry (although adding new ones is
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* encouraged once assigned by ANSI/INCITS T10
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*/
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static const char *const scsi_device_types[] = {
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"Direct-Access ",
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"Sequential-Access",
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"Printer ",
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"Processor ",
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"WORM ",
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"CD-ROM ",
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"Scanner ",
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"Optical Device ",
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"Medium Changer ",
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"Communications ",
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"ASC IT8 ",
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"ASC IT8 ",
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"RAID ",
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"Enclosure ",
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"Direct-Access-RBC",
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"Optical card ",
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"Bridge controller",
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"Object storage ",
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"Automation/Drive ",
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"Security Manager ",
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"Direct-Access-ZBC",
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};
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/**
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* scsi_device_type - Return 17 char string indicating device type.
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* @type: type number to look up
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*/
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const char *scsi_device_type(unsigned type)
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{
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if (type == 0x1e)
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return "Well-known LUN ";
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if (type == 0x1f)
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return "No Device ";
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if (type >= ARRAY_SIZE(scsi_device_types))
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return "Unknown ";
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return scsi_device_types[type];
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}
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EXPORT_SYMBOL(scsi_device_type);
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/**
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* scsilun_to_int - convert a scsi_lun to an int
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* @scsilun: struct scsi_lun to be converted.
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*
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* Description:
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* Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
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* integer, and return the result. The caller must check for
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* truncation before using this function.
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*
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* Notes:
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* For a description of the LUN format, post SCSI-3 see the SCSI
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* Architecture Model, for SCSI-3 see the SCSI Controller Commands.
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*
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* Given a struct scsi_lun of: d2 04 0b 03 00 00 00 00, this function
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* returns the integer: 0x0b03d204
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*
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* This encoding will return a standard integer LUN for LUNs smaller
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* than 256, which typically use a single level LUN structure with
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* addressing method 0.
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*/
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u64 scsilun_to_int(struct scsi_lun *scsilun)
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{
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int i;
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u64 lun;
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lun = 0;
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for (i = 0; i < sizeof(lun); i += 2)
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lun = lun | (((u64)scsilun->scsi_lun[i] << ((i + 1) * 8)) |
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((u64)scsilun->scsi_lun[i + 1] << (i * 8)));
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return lun;
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}
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EXPORT_SYMBOL(scsilun_to_int);
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/**
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* int_to_scsilun - reverts an int into a scsi_lun
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* @lun: integer to be reverted
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* @scsilun: struct scsi_lun to be set.
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*
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* Description:
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* Reverts the functionality of the scsilun_to_int, which packed
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* an 8-byte lun value into an int. This routine unpacks the int
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* back into the lun value.
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*
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* Notes:
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* Given an integer : 0x0b03d204, this function returns a
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* struct scsi_lun of: d2 04 0b 03 00 00 00 00
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*
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*/
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void int_to_scsilun(u64 lun, struct scsi_lun *scsilun)
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{
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int i;
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memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
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for (i = 0; i < sizeof(lun); i += 2) {
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scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
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scsilun->scsi_lun[i+1] = lun & 0xFF;
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lun = lun >> 16;
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}
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}
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EXPORT_SYMBOL(int_to_scsilun);
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/**
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* scsi_normalize_sense - normalize main elements from either fixed or
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* descriptor sense data format into a common format.
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*
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* @sense_buffer: byte array containing sense data returned by device
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* @sb_len: number of valid bytes in sense_buffer
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* @sshdr: pointer to instance of structure that common
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* elements are written to.
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*
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* Notes:
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* The "main elements" from sense data are: response_code, sense_key,
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* asc, ascq and additional_length (only for descriptor format).
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*
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* Typically this function can be called after a device has
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* responded to a SCSI command with the CHECK_CONDITION status.
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*
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* Return value:
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* true if valid sense data information found, else false;
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*/
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bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
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struct scsi_sense_hdr *sshdr)
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{
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if (!sense_buffer || !sb_len)
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return false;
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memset(sshdr, 0, sizeof(struct scsi_sense_hdr));
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sshdr->response_code = (sense_buffer[0] & 0x7f);
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if (!scsi_sense_valid(sshdr))
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return false;
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if (sshdr->response_code >= 0x72) {
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/*
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* descriptor format
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*/
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if (sb_len > 1)
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sshdr->sense_key = (sense_buffer[1] & 0xf);
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if (sb_len > 2)
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sshdr->asc = sense_buffer[2];
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if (sb_len > 3)
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sshdr->ascq = sense_buffer[3];
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if (sb_len > 7)
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sshdr->additional_length = sense_buffer[7];
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} else {
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/*
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* fixed format
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*/
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if (sb_len > 2)
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sshdr->sense_key = (sense_buffer[2] & 0xf);
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if (sb_len > 7) {
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sb_len = (sb_len < (sense_buffer[7] + 8)) ?
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sb_len : (sense_buffer[7] + 8);
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if (sb_len > 12)
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sshdr->asc = sense_buffer[12];
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if (sb_len > 13)
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sshdr->ascq = sense_buffer[13];
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}
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}
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return true;
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}
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EXPORT_SYMBOL(scsi_normalize_sense);
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