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-rw-r--r--contrib/syslinux-4.02/gpxe/src/drivers/block/scsi.c366
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diff --git a/contrib/syslinux-4.02/gpxe/src/drivers/block/scsi.c b/contrib/syslinux-4.02/gpxe/src/drivers/block/scsi.c
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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.
+ */
+
+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;
+}