USB: mass storage: emulation of sat scsi_pass_thru with ATACB
I have got a cypress usb-ide bridge and I would like to tune or monitor my disk with tools like hdparm, hddtemp or smartctl. My controller support a way to send raw ATA command to the disk with something call atacb (see http://download.cypress.com.edgesuite.net/design_resources/datasheets/contents/cy7c68300c_8.pdf). Atacb support can be added for each application, but there is some disadvantages : - all application need to be patched - A race is possible if there other accesses, because the emulation can be split in 2 atacb scsi transactions. One for sending the command, one for reading the register (if ck_cond is set). I have implemented the emulation in usb-storage with a special proto_handler, and an unsual entry. Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr> Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
matthieu castet
Greg Kroah-Hartman
parent
dda43a0e03
commit
d277064e7e
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@ -145,6 +145,17 @@ config USB_STORAGE_KARMA
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on the resulting scsi device node returns the Karma to normal
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operation.
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config USB_STORAGE_CYPRESS_ATACB
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bool "SAT emulation on Cypress USB/ATA Bridge with ATACB"
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depends on USB_STORAGE
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---help---
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Say Y here if you want to use SAT (ata pass through) on devices based
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on the Cypress USB/ATA bridge supporting ATACB. This will allow you
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to use tools to tune and monitor your drive (like hdparm or smartctl).
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If you say no here your device will still work with the standard usb
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mass storage class.
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config USB_LIBUSUAL
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bool "The shared table of common (or usual) storage devices"
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depends on USB
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@ -21,6 +21,7 @@ usb-storage-obj-$(CONFIG_USB_STORAGE_JUMPSHOT) += jumpshot.o
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usb-storage-obj-$(CONFIG_USB_STORAGE_ALAUDA) += alauda.o
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usb-storage-obj-$(CONFIG_USB_STORAGE_ONETOUCH) += onetouch.o
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usb-storage-obj-$(CONFIG_USB_STORAGE_KARMA) += karma.o
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usb-storage-obj-$(CONFIG_USB_STORAGE_CYPRESS_ATACB) += cypress_atacb.o
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usb-storage-objs := scsiglue.o protocol.o transport.o usb.o \
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initializers.o $(usb-storage-obj-y)
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@ -0,0 +1,200 @@
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/*
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* Support for emulating SAT (ata pass through) on devices based
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* on the Cypress USB/ATA bridge supporting ATACB.
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*
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* Copyright (c) 2008 Matthieu Castet (castet.matthieu@free.fr)
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_eh.h>
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#include <linux/ata.h>
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#include "usb.h"
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#include "protocol.h"
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#include "scsiglue.h"
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#include "debug.h"
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/*
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* ATACB is a protocol used on cypress usb<->ata bridge to
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* send raw ATA command over mass storage
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* There is a ATACB2 protocol that support LBA48 on newer chip.
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* More info that be found on cy7c68310_8.pdf and cy7c68300c_8.pdf
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* datasheet from cypress.com.
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*/
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void cypress_atacb_passthrough(struct scsi_cmnd *srb, struct us_data *us)
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{
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unsigned char save_cmnd[MAX_COMMAND_SIZE];
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if (likely(srb->cmnd[0] != ATA_16 && srb->cmnd[0] != ATA_12)) {
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usb_stor_transparent_scsi_command(srb, us);
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return;
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}
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memcpy(save_cmnd, srb->cmnd, sizeof(save_cmnd));
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memset(srb->cmnd, 0, sizeof(srb->cmnd));
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/* check if we support the command */
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if (save_cmnd[1] >> 5) /* MULTIPLE_COUNT */
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goto invalid_fld;
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/* check protocol */
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switch((save_cmnd[1] >> 1) & 0xf) {
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case 3: /*no DATA */
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case 4: /* PIO in */
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case 5: /* PIO out */
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break;
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default:
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goto invalid_fld;
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}
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/* first build the ATACB command */
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srb->cmd_len = 16;
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srb->cmnd[0] = 0x24; /* bVSCBSignature : vendor-specific command
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this value can change, but most(all ?) manufacturers
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keep the cypress default : 0x24 */
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srb->cmnd[1] = 0x24; /* bVSCBSubCommand : 0x24 for ATACB */
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srb->cmnd[3] = 0xff - 1; /* features, sector count, lba low, lba med
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lba high, device, command are valid */
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srb->cmnd[4] = 1; /* TransferBlockCount : 512 */
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if (save_cmnd[0] == ATA_16) {
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srb->cmnd[ 6] = save_cmnd[ 4]; /* features */
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srb->cmnd[ 7] = save_cmnd[ 6]; /* sector count */
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srb->cmnd[ 8] = save_cmnd[ 8]; /* lba low */
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srb->cmnd[ 9] = save_cmnd[10]; /* lba med */
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srb->cmnd[10] = save_cmnd[12]; /* lba high */
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srb->cmnd[11] = save_cmnd[13]; /* device */
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srb->cmnd[12] = save_cmnd[14]; /* command */
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if (save_cmnd[1] & 0x01) {/* extended bit set for LBA48 */
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/* this could be supported by atacb2 */
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if (save_cmnd[3] || save_cmnd[5] || save_cmnd[7] || save_cmnd[9]
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|| save_cmnd[11])
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goto invalid_fld;
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}
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}
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else { /* ATA12 */
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srb->cmnd[ 6] = save_cmnd[3]; /* features */
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srb->cmnd[ 7] = save_cmnd[4]; /* sector count */
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srb->cmnd[ 8] = save_cmnd[5]; /* lba low */
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srb->cmnd[ 9] = save_cmnd[6]; /* lba med */
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srb->cmnd[10] = save_cmnd[7]; /* lba high */
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srb->cmnd[11] = save_cmnd[8]; /* device */
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srb->cmnd[12] = save_cmnd[9]; /* command */
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}
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/* Filter SET_FEATURES - XFER MODE command */
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if ((srb->cmnd[12] == ATA_CMD_SET_FEATURES)
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&& (srb->cmnd[6] == SETFEATURES_XFER))
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goto invalid_fld;
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if (srb->cmnd[12] == ATA_CMD_ID_ATA || srb->cmnd[12] == ATA_CMD_ID_ATAPI)
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srb->cmnd[2] |= (1<<7); /* set IdentifyPacketDevice for these cmds */
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usb_stor_transparent_scsi_command(srb, us);
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/* if the device doesn't support ATACB
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*/
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if (srb->result == SAM_STAT_CHECK_CONDITION &&
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memcmp(srb->sense_buffer, usb_stor_sense_invalidCDB,
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sizeof(usb_stor_sense_invalidCDB)) == 0) {
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US_DEBUGP("cypress atacb not supported ???\n");
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goto end;
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}
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/* if ck_cond flags is set, and there wasn't critical error,
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* build the special sense
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*/
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if ((srb->result != (DID_ERROR << 16) &&
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srb->result != (DID_ABORT << 16)) &&
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save_cmnd[2] & 0x20) {
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struct scsi_eh_save ses;
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unsigned char regs[8];
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unsigned char *sb = srb->sense_buffer;
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unsigned char *desc = sb + 8;
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int tmp_result;
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/* build the command for
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* reading the ATA registers */
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scsi_eh_prep_cmnd(srb, &ses, NULL, 0, 0);
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srb->sdb.length = sizeof(regs);
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sg_init_one(&ses.sense_sgl, regs, srb->sdb.length);
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srb->sdb.table.sgl = &ses.sense_sgl;
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srb->sc_data_direction = DMA_FROM_DEVICE;
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srb->sdb.table.nents = 1;
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/* we use the same command as before, but we set
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* the read taskfile bit, for not executing atacb command,
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* but reading register selected in srb->cmnd[4]
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*/
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srb->cmnd[2] = 1;
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usb_stor_transparent_scsi_command(srb, us);
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tmp_result = srb->result;
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scsi_eh_restore_cmnd(srb, &ses);
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/* we fail to get registers, report invalid command */
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if (tmp_result != SAM_STAT_GOOD)
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goto invalid_fld;
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/* build the sense */
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memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
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/* set sk, asc for a good command */
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sb[1] = RECOVERED_ERROR;
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sb[2] = 0; /* ATA PASS THROUGH INFORMATION AVAILABLE */
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sb[3] = 0x1D;
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/* XXX we should generate sk, asc, ascq from status and error
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* regs
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* (see 11.1 Error translation ATA device error to SCSI error map)
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* and ata_to_sense_error from libata.
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*/
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/* Sense data is current and format is descriptor. */
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sb[0] = 0x72;
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desc[0] = 0x09; /* ATA_RETURN_DESCRIPTOR */
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/* set length of additional sense data */
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sb[7] = 14;
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desc[1] = 12;
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/* Copy registers into sense buffer. */
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desc[ 2] = 0x00;
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desc[ 3] = regs[1]; /* features */
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desc[ 5] = regs[2]; /* sector count */
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desc[ 7] = regs[3]; /* lba low */
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desc[ 9] = regs[4]; /* lba med */
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desc[11] = regs[5]; /* lba high */
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desc[12] = regs[6]; /* device */
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desc[13] = regs[7]; /* command */
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srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
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}
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goto end;
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invalid_fld:
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srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
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memcpy(srb->sense_buffer,
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usb_stor_sense_invalidCDB,
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sizeof(usb_stor_sense_invalidCDB));
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end:
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memcpy(srb->cmnd, save_cmnd, sizeof(save_cmnd));
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if (srb->cmnd[0] == ATA_12)
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srb->cmd_len = 12;
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}
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@ -0,0 +1,25 @@
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/*
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* Support for emulating SAT (ata pass through) on devices based
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* on the Cypress USB/ATA bridge supporting ATACB.
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*
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* Copyright (c) 2008 Matthieu Castet (castet.matthieu@free.fr)
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _CYPRESS_ATACB_H_
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#define _CYPRESS_ATACB_H_
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extern void cypress_atacb_passthrough(struct scsi_cmnd*, struct us_data*);
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#endif
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@ -132,7 +132,7 @@ static int slave_configure(struct scsi_device *sdev)
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/* Disk-type devices use MODE SENSE(6) if the protocol
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* (SubClass) is Transparent SCSI, otherwise they use
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* MODE SENSE(10). */
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if (us->subclass != US_SC_SCSI)
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if (us->subclass != US_SC_SCSI && us->subclass != US_SC_CYP_ATACB)
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sdev->use_10_for_ms = 1;
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/* Many disks only accept MODE SENSE transfer lengths of
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@ -603,7 +603,8 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
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scsi_eh_prep_cmnd(srb, &ses, NULL, 0, US_SENSE_SIZE);
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/* FIXME: we must do the protocol translation here */
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if (us->subclass == US_SC_RBC || us->subclass == US_SC_SCSI)
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if (us->subclass == US_SC_RBC || us->subclass == US_SC_SCSI ||
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us->subclass == US_SC_CYP_ATACB)
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srb->cmd_len = 6;
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else
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srb->cmd_len = 12;
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@ -1719,6 +1719,14 @@ UNUSUAL_DEV( 0xed06, 0x4500, 0x0001, 0x0001,
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US_SC_DEVICE, US_PR_DEVICE, NULL,
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US_FL_CAPACITY_HEURISTICS),
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#ifdef CONFIG_USB_STORAGE_CYPRESS_ATACB
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UNUSUAL_DEV( 0x04b4, 0x6830, 0x0000, 0x9999,
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"Cypress",
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"Cypress AT2LP",
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US_SC_CYP_ATACB, US_PR_BULK, NULL,
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0),
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#endif
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/* Control/Bulk transport for all SubClass values */
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USUAL_DEV(US_SC_RBC, US_PR_CB, USB_US_TYPE_STOR),
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USUAL_DEV(US_SC_8020, US_PR_CB, USB_US_TYPE_STOR),
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@ -101,6 +101,9 @@
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#ifdef CONFIG_USB_STORAGE_KARMA
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#include "karma.h"
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#endif
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#ifdef CONFIG_USB_STORAGE_CYPRESS_ATACB
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#include "cypress_atacb.h"
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#endif
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/* Some informational data */
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MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>");
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@ -708,6 +711,13 @@ static int get_protocol(struct us_data *us)
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break;
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#endif
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#ifdef CONFIG_USB_STORAGE_CYPRESS_ATACB
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case US_SC_CYP_ATACB:
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us->protocol_name = "Transparent SCSI with Cypress ATACB";
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us->proto_handler = cypress_atacb_passthrough;
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break;
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#endif
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default:
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return -EIO;
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}
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@ -85,6 +85,7 @@ enum { US_DO_ALL_FLAGS };
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#define US_SC_LOCKABLE 0x07 /* Password-protected */
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#define US_SC_ISD200 0xf0 /* ISD200 ATA */
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#define US_SC_CYP_ATACB 0xf1 /* Cypress ATACB */
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#define US_SC_DEVICE 0xff /* Use device's value */
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/* Protocols */
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