diff options
Diffstat (limited to 'gpxe/src/drivers/block/scsi.c')
| -rw-r--r-- | gpxe/src/drivers/block/scsi.c | 366 |
1 files changed, 0 insertions, 366 deletions
diff --git a/gpxe/src/drivers/block/scsi.c b/gpxe/src/drivers/block/scsi.c deleted file mode 100644 index a51b3af6..00000000 --- a/gpxe/src/drivers/block/scsi.c +++ /dev/null @@ -1,366 +0,0 @@ -/* - * 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. - */ - -FILE_LICENCE ( GPL2_OR_LATER ); - -#include <stddef.h> -#include <stdlib.h> -#include <string.h> -#include <byteswap.h> -#include <errno.h> -#include <gpxe/blockdev.h> -#include <gpxe/process.h> -#include <gpxe/scsi.h> - -/** @file - * - * SCSI block device - * - */ - -/** Maximum number of dummy "read capacity (10)" operations - * - * These are issued at connection setup to draw out various useless - * power-on messages. - */ -#define SCSI_MAX_DUMMY_READ_CAP 10 - -static inline __attribute__ (( always_inline )) struct scsi_device * -block_to_scsi ( struct block_device *blockdev ) { - return container_of ( blockdev, struct scsi_device, blockdev ); -} - -/** - * Handle SCSI command with no backing device - * - * @v scsi SCSI device - * @v command SCSI command - * @ret rc Return status code - */ -int scsi_detached_command ( struct scsi_device *scsi __unused, - struct scsi_command *command __unused ) { - return -ENODEV; -} - -/** - * 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; - - DBGC2 ( scsi, "SCSI %p " SCSI_CDB_FORMAT "\n", - scsi, SCSI_CDB_DATA ( command->cdb ) ); - - /* Clear sense response code before issuing command */ - command->sense_response = 0; - - /* Flag command as in-progress */ - command->rc = -EINPROGRESS; - - /* Issue SCSI command */ - if ( ( rc = scsi->command ( scsi, command ) ) != 0 ) { - /* Something went wrong with the issuing mechanism */ - DBGC ( scsi, "SCSI %p " SCSI_CDB_FORMAT " err %s\n", - scsi, SCSI_CDB_DATA ( command->cdb ), strerror ( rc ) ); - return rc; - } - - /* Wait for command to complete */ - while ( command->rc == -EINPROGRESS ) - step(); - if ( ( rc = command->rc ) != 0 ) { - /* Something went wrong with the command execution */ - DBGC ( scsi, "SCSI %p " SCSI_CDB_FORMAT " err %s\n", - scsi, SCSI_CDB_DATA ( command->cdb ), strerror ( rc ) ); - return rc; - } - - /* Check for SCSI errors */ - if ( command->status != 0 ) { - DBGC ( scsi, "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; -} - -static struct block_device_operations scsi_operations_16 = { - .read = scsi_read_16, - .write = scsi_write_16, -}; - -static struct block_device_operations scsi_operations_10 = { - .read = scsi_read_10, - .write = scsi_write_10, -}; - -/** - * 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 ) { - unsigned int i; - int rc; - - /* Issue some theoretically extraneous READ CAPACITY (10) - * commands, solely in order to draw out the "CHECK CONDITION - * (power-on occurred)", "CHECK CONDITION (reported LUNs data - * has changed)" etc. that some dumb targets insist on sending - * as an error at start of day. The precise command that we - * use is unimportant; we just need to provide the target with - * an opportunity to send its responses. - */ - for ( i = 0 ; i < SCSI_MAX_DUMMY_READ_CAP ; i++ ) { - if ( ( rc = scsi_read_capacity_10 ( &scsi->blockdev ) ) == 0 ) - break; - DBGC ( scsi, "SCSI %p ignoring start-of-day error (#%d)\n", - scsi, ( i + 1 ) ); - } - - /* Try READ CAPACITY (10), which is a mandatory command, first. */ - scsi->blockdev.op = &scsi_operations_10; - if ( ( rc = scsi_read_capacity_10 ( &scsi->blockdev ) ) != 0 ) { - DBGC ( scsi, "SCSI %p could not READ CAPACITY (10): %s\n", - scsi, strerror ( rc ) ); - 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.op = &scsi_operations_16; - if ( ( rc = scsi_read_capacity_16 ( &scsi->blockdev ) ) != 0 ){ - DBGC ( scsi, "SCSI %p could not READ CAPACITY (16): " - "%s\n", scsi, strerror ( rc ) ); - return rc; - } - } - - DBGC ( scsi, "SCSI %p using READ/WRITE (%d) commands\n", scsi, - ( ( scsi->blockdev.op == &scsi_operations_10 ) ? 10 : 16 ) ); - DBGC ( scsi, "SCSI %p capacity is %ld MB (%#llx blocks)\n", scsi, - ( ( unsigned long ) ( scsi->blockdev.blocks >> 11 ) ), - scsi->blockdev.blocks ); - - return 0; -} - -/** - * Parse SCSI LUN - * - * @v lun_string LUN string representation - * @v lun LUN to fill in - * @ret rc Return status code - */ -int scsi_parse_lun ( const char *lun_string, struct scsi_lun *lun ) { - char *p; - int i; - - memset ( lun, 0, sizeof ( *lun ) ); - if ( lun_string ) { - p = ( char * ) lun_string; - for ( i = 0 ; i < 4 ; i++ ) { - lun->u16[i] = htons ( strtoul ( p, &p, 16 ) ); - if ( *p == '\0' ) - break; - if ( *p != '-' ) - return -EINVAL; - p++; - } - if ( *p ) - return -EINVAL; - } - - return 0; -} |