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READ CAPACITY (16) turns out to be an optional command (even though
READ(16) is mandatory); we must use READ CAPACITY (10) first and then use READ CAPACITY (16) if the READ CAPACITY (10) returns "out of range".
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@ -96,12 +96,41 @@ static int scsi_write ( struct block_device *blockdev, uint64_t block,
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}
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/**
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* Read capacity of SCSI device
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* Read capacity of SCSI device via READ CAPACITY (10)
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*
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* @v blockdev Block device
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* @ret rc Return status code
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*/
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static int scsi_read_capacity ( struct block_device *blockdev ) {
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static int scsi_read_capacity_10 ( struct block_device *blockdev ) {
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struct scsi_device *scsi = block_to_scsi ( blockdev );
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struct scsi_command command;
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struct scsi_cdb_read_capacity_10 *cdb = &command.cdb.readcap10;
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struct scsi_capacity_10 capacity;
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int rc;
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/* Issue READ CAPACITY (10) */
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memset ( &command, 0, sizeof ( command ) );
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cdb->opcode = SCSI_OPCODE_READ_CAPACITY_10;
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command.data_in = virt_to_user ( &capacity );
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command.data_in_len = sizeof ( capacity );
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if ( ( rc = scsi_command ( scsi, &command ) ) != 0 )
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return rc;
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/* Fill in block device fields */
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blockdev->blksize = be32_to_cpu ( capacity.blksize );
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blockdev->blocks = ( be32_to_cpu ( capacity.lba ) + 1 );
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return 0;
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}
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/**
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* Read capacity of SCSI device via READ CAPACITY (16)
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*
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* @v blockdev Block device
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* @ret rc Return status code
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*/
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static int scsi_read_capacity_16 ( struct block_device *blockdev ) {
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struct scsi_device *scsi = block_to_scsi ( blockdev );
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struct scsi_command command;
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struct scsi_cdb_read_capacity_16 *cdb = &command.cdb.readcap16;
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@ -125,6 +154,32 @@ static int scsi_read_capacity ( struct block_device *blockdev ) {
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return 0;
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}
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/**
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* Read capacity of SCSI device
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*
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* @v blockdev Block device
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* @ret rc Return status code
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*/
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static int scsi_read_capacity ( struct block_device *blockdev ) {
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int rc;
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/* Try READ CAPACITY (10), which is a mandatory command, first. */
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if ( ( rc = scsi_read_capacity_10 ( blockdev ) ) != 0 )
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return rc;
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/* If capacity range was exceeded (i.e. capacity.lba was
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* 0xffffffff, meaning that blockdev->blocks is now zero), use
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* READ CAPACITY (16) instead. READ CAPACITY (16) is not
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* mandatory, so we can't just use it straight off.
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*/
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if ( blockdev->blocks == 0 ) {
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if ( ( rc = scsi_read_capacity_16 ( blockdev ) ) != 0 )
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return rc;
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}
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return 0;
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}
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/**
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* Initialise SCSI device
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*
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@ -12,6 +12,7 @@
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#define SCSI_OPCODE_READ_16 0x88 /**< READ (16) */
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#define SCSI_OPCODE_WRITE_16 0x8a /**< WRITE (16) */
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#define SCSI_OPCODE_READ_CAPACITY_10 0x25 /**< READ CAPACITY (10) */
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#define SCSI_OPCODE_SERVICE_ACTION_IN 0x9e /**< SERVICE ACTION IN */
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#define SCSI_SERVICE_ACTION_READ_CAPACITY_16 0x10 /**< READ CAPACITY (16) */
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@ -77,6 +78,31 @@ struct scsi_cdb_write_16 {
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uint8_t control;
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} __attribute__ (( packed ));
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/** A SCSI "READ CAPACITY (10)" CDB */
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struct scsi_cdb_read_capacity_10 {
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/** Opcode (0x25) */
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uint8_t opcode;
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/** Reserved */
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uint8_t reserved_a;
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/** Logical block address
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*
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* Applicable only if the PMI bit is set.
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*/
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uint32_t lba;
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/** Reserved */
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uint8_t reserved_b[3];
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/** Control byte */
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uint8_t control;
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} __attribute__ (( packed ));
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/** SCSI "READ CAPACITY (10)" parameter data */
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struct scsi_capacity_10 {
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/** Maximum logical block number */
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uint32_t lba;
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/** Block length in bytes */
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uint32_t blksize;
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} __attribute__ (( packed ));
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/** A SCSI "READ CAPACITY (16)" CDB */
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struct scsi_cdb_read_capacity_16 {
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/** Opcode (0x9e) */
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@ -113,6 +139,7 @@ struct scsi_capacity_16 {
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union scsi_cdb {
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struct scsi_cdb_read_16 read16;
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struct scsi_cdb_write_16 write16;
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struct scsi_cdb_read_capacity_10 readcap10;
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struct scsi_cdb_read_capacity_16 readcap16;
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char bytes[16];
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};
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