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- /*
- * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- #include <stddef.h>
- #include <string.h>
- #include <byteswap.h>
- #include <errno.h>
- #include <gpxe/blockdev.h>
- #include <gpxe/scsi.h>
-
- /** @file
- *
- * SCSI block device
- *
- */
-
- static inline __attribute__ (( always_inline )) struct scsi_device *
- block_to_scsi ( struct block_device *blockdev ) {
- return container_of ( blockdev, struct scsi_device, blockdev );
- }
-
- /**
- * Issue SCSI command
- *
- * @v scsi SCSI device
- * @v command SCSI command
- * @ret rc Return status code
- */
- static int scsi_command ( struct scsi_device *scsi,
- struct scsi_command *command ) {
- int rc;
-
- /* Clear sense response code before issuing command */
- command->sense_response = 0;
-
- /* Issue SCSI command */
- if ( ( rc = scsi->command ( scsi, command ) ) != 0 ) {
- /* Something went wrong with the issuing mechanism,
- * (rather than with the command itself)
- */
- DBG ( "SCSI %p " SCSI_CDB_FORMAT " err %d\n",
- scsi, SCSI_CDB_DATA ( command->cdb ), rc );
- return rc;
- }
-
- /* Check for SCSI errors */
- if ( command->status != 0 ) {
- DBG ( "SCSI %p " SCSI_CDB_FORMAT " status %02x sense %02x\n",
- scsi, SCSI_CDB_DATA ( command->cdb ),
- command->status, command->sense_response );
- return -EIO;
- }
-
- return 0;
- }
-
- /**
- * Read block from SCSI device using READ (10)
- *
- * @v blockdev Block device
- * @v block LBA block number
- * @v count Block count
- * @v buffer Data buffer
- * @ret rc Return status code
- */
- static int scsi_read_10 ( struct block_device *blockdev, uint64_t block,
- unsigned long count, userptr_t buffer ) {
- struct scsi_device *scsi = block_to_scsi ( blockdev );
- struct scsi_command command;
- struct scsi_cdb_read_10 *cdb = &command.cdb.read10;
-
- /* Issue READ (10) */
- memset ( &command, 0, sizeof ( command ) );
- cdb->opcode = SCSI_OPCODE_READ_10;
- cdb->lba = cpu_to_be32 ( block );
- cdb->len = cpu_to_be16 ( count );
- command.data_in = buffer;
- command.data_in_len = ( count * blockdev->blksize );
- return scsi_command ( scsi, &command );
- }
-
- /**
- * Read block from SCSI device using READ (16)
- *
- * @v blockdev Block device
- * @v block LBA block number
- * @v count Block count
- * @v buffer Data buffer
- * @ret rc Return status code
- */
- static int scsi_read_16 ( struct block_device *blockdev, uint64_t block,
- unsigned long count, userptr_t buffer ) {
- struct scsi_device *scsi = block_to_scsi ( blockdev );
- struct scsi_command command;
- struct scsi_cdb_read_16 *cdb = &command.cdb.read16;
-
- /* Issue READ (16) */
- memset ( &command, 0, sizeof ( command ) );
- cdb->opcode = SCSI_OPCODE_READ_16;
- cdb->lba = cpu_to_be64 ( block );
- cdb->len = cpu_to_be32 ( count );
- command.data_in = buffer;
- command.data_in_len = ( count * blockdev->blksize );
- return scsi_command ( scsi, &command );
- }
-
- /**
- * Write block to SCSI device using WRITE (10)
- *
- * @v blockdev Block device
- * @v block LBA block number
- * @v count Block count
- * @v buffer Data buffer
- * @ret rc Return status code
- */
- static int scsi_write_10 ( struct block_device *blockdev, uint64_t block,
- unsigned long count, userptr_t buffer ) {
- struct scsi_device *scsi = block_to_scsi ( blockdev );
- struct scsi_command command;
- struct scsi_cdb_write_10 *cdb = &command.cdb.write10;
-
- /* Issue WRITE (10) */
- memset ( &command, 0, sizeof ( command ) );
- cdb->opcode = SCSI_OPCODE_WRITE_10;
- cdb->lba = cpu_to_be32 ( block );
- cdb->len = cpu_to_be16 ( count );
- command.data_out = buffer;
- command.data_out_len = ( count * blockdev->blksize );
- return scsi_command ( scsi, &command );
- }
-
- /**
- * Write block to SCSI device using WRITE (16)
- *
- * @v blockdev Block device
- * @v block LBA block number
- * @v count Block count
- * @v buffer Data buffer
- * @ret rc Return status code
- */
- static int scsi_write_16 ( struct block_device *blockdev, uint64_t block,
- unsigned long count, userptr_t buffer ) {
- struct scsi_device *scsi = block_to_scsi ( blockdev );
- struct scsi_command command;
- struct scsi_cdb_write_16 *cdb = &command.cdb.write16;
-
- /* Issue WRITE (16) */
- memset ( &command, 0, sizeof ( command ) );
- cdb->opcode = SCSI_OPCODE_WRITE_16;
- cdb->lba = cpu_to_be64 ( block );
- cdb->len = cpu_to_be32 ( count );
- command.data_out = buffer;
- command.data_out_len = ( count * blockdev->blksize );
- return scsi_command ( scsi, &command );
- }
-
- /**
- * Read capacity of SCSI device via READ CAPACITY (10)
- *
- * @v blockdev Block device
- * @ret rc Return status code
- */
- static int scsi_read_capacity_10 ( struct block_device *blockdev ) {
- struct scsi_device *scsi = block_to_scsi ( blockdev );
- struct scsi_command command;
- struct scsi_cdb_read_capacity_10 *cdb = &command.cdb.readcap10;
- struct scsi_capacity_10 capacity;
- int rc;
-
- /* Issue READ CAPACITY (10) */
- memset ( &command, 0, sizeof ( command ) );
- cdb->opcode = SCSI_OPCODE_READ_CAPACITY_10;
- command.data_in = virt_to_user ( &capacity );
- command.data_in_len = sizeof ( capacity );
-
- if ( ( rc = scsi_command ( scsi, &command ) ) != 0 )
- return rc;
-
- /* Fill in block device fields */
- blockdev->blksize = be32_to_cpu ( capacity.blksize );
- blockdev->blocks = ( be32_to_cpu ( capacity.lba ) + 1 );
-
- return 0;
- }
-
- /**
- * Read capacity of SCSI device via READ CAPACITY (16)
- *
- * @v blockdev Block device
- * @ret rc Return status code
- */
- static int scsi_read_capacity_16 ( struct block_device *blockdev ) {
- struct scsi_device *scsi = block_to_scsi ( blockdev );
- struct scsi_command command;
- struct scsi_cdb_read_capacity_16 *cdb = &command.cdb.readcap16;
- struct scsi_capacity_16 capacity;
- int rc;
-
- /* Issue READ CAPACITY (16) */
- memset ( &command, 0, sizeof ( command ) );
- cdb->opcode = SCSI_OPCODE_SERVICE_ACTION_IN;
- cdb->service_action = SCSI_SERVICE_ACTION_READ_CAPACITY_16;
- cdb->len = cpu_to_be32 ( sizeof ( capacity ) );
- command.data_in = virt_to_user ( &capacity );
- command.data_in_len = sizeof ( capacity );
-
- if ( ( rc = scsi_command ( scsi, &command ) ) != 0 )
- return rc;
-
- /* Fill in block device fields */
- blockdev->blksize = be32_to_cpu ( capacity.blksize );
- blockdev->blocks = ( be64_to_cpu ( capacity.lba ) + 1 );
- return 0;
- }
-
- /**
- * Initialise SCSI device
- *
- * @v scsi SCSI device
- * @ret rc Return status code
- *
- * Initialises a SCSI device. The scsi_device::command and
- * scsi_device::lun fields must already be filled in. This function
- * will configure scsi_device::blockdev, including issuing a READ
- * CAPACITY call to determine the block size and total device size.
- */
- int init_scsidev ( struct scsi_device *scsi ) {
- int rc;
-
- /* Issue a theoretically extraneous READ CAPACITY (10)
- * command, solely in order to draw out the "CHECK CONDITION
- * (power-on occurred)" that some dumb targets insist on
- * sending as an error at start of day.
- */
- scsi_read_capacity_10 ( &scsi->blockdev );
-
- /* Try READ CAPACITY (10), which is a mandatory command, first. */
- scsi->blockdev.read = scsi_read_10;
- scsi->blockdev.write = scsi_write_10;
- if ( ( rc = scsi_read_capacity_10 ( &scsi->blockdev ) ) != 0 )
- return rc;
-
- /* If capacity range was exceeded (i.e. capacity.lba was
- * 0xffffffff, meaning that blockdev->blocks is now zero), use
- * READ CAPACITY (16) instead. READ CAPACITY (16) is not
- * mandatory, so we can't just use it straight off.
- */
- if ( scsi->blockdev.blocks == 0 ) {
- scsi->blockdev.read = scsi_read_16;
- scsi->blockdev.write = scsi_write_16;
- if ( ( rc = scsi_read_capacity_16 ( &scsi->blockdev ) ) != 0 )
- return rc;
- }
-
- return 0;
- }
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