549 lines
13 KiB
C
549 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Target driver for EMC CLARiiON AX/CX-series hardware.
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* Based on code from Lars Marowsky-Bree <lmb@suse.de>
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* and Ed Goggin <egoggin@emc.com>.
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*
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* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
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* Copyright (C) 2006 Mike Christie
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_dh.h>
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#include <scsi/scsi_device.h>
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#define CLARIION_NAME "emc"
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#define CLARIION_TRESPASS_PAGE 0x22
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#define CLARIION_BUFFER_SIZE 0xFC
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#define CLARIION_TIMEOUT (60 * HZ)
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#define CLARIION_RETRIES 3
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#define CLARIION_UNBOUND_LU -1
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#define CLARIION_SP_A 0
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#define CLARIION_SP_B 1
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/* Flags */
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#define CLARIION_SHORT_TRESPASS 1
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#define CLARIION_HONOR_RESERVATIONS 2
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/* LUN states */
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#define CLARIION_LUN_UNINITIALIZED -1
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#define CLARIION_LUN_UNBOUND 0
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#define CLARIION_LUN_BOUND 1
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#define CLARIION_LUN_OWNED 2
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static unsigned char long_trespass[] = {
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0, 0, 0, 0, 0, 0, 0, 0,
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CLARIION_TRESPASS_PAGE, /* Page code */
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0x09, /* Page length - 2 */
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0x01, /* Trespass code */
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0xff, 0xff, /* Trespass target */
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0, 0, 0, 0, 0, 0 /* Reserved bytes / unknown */
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};
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static unsigned char short_trespass[] = {
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0, 0, 0, 0,
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CLARIION_TRESPASS_PAGE, /* Page code */
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0x02, /* Page length - 2 */
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0x01, /* Trespass code */
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0xff, /* Trespass target */
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};
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static const char * lun_state[] =
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{
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"not bound",
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"bound",
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"owned",
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};
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struct clariion_dh_data {
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/*
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* Flags:
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* CLARIION_SHORT_TRESPASS
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* Use short trespass command (FC-series) or the long version
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* (default for AX/CX CLARiiON arrays).
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*
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* CLARIION_HONOR_RESERVATIONS
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* Whether or not (default) to honor SCSI reservations when
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* initiating a switch-over.
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*/
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unsigned flags;
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/*
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* I/O buffer for both MODE_SELECT and INQUIRY commands.
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*/
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unsigned char buffer[CLARIION_BUFFER_SIZE];
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/*
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* LUN state
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*/
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int lun_state;
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/*
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* SP Port number
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*/
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int port;
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/*
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* which SP (A=0,B=1,UNBOUND=-1) is the default SP for this
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* path's mapped LUN
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*/
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int default_sp;
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/*
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* which SP (A=0,B=1,UNBOUND=-1) is the active SP for this
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* path's mapped LUN
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*/
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int current_sp;
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};
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/*
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* Parse MODE_SELECT cmd reply.
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*/
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static int trespass_endio(struct scsi_device *sdev,
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struct scsi_sense_hdr *sshdr)
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{
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int err = SCSI_DH_IO;
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sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, "
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"0x%2x, 0x%2x while sending CLARiiON trespass "
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"command.\n", CLARIION_NAME, sshdr->sense_key,
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sshdr->asc, sshdr->ascq);
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if (sshdr->sense_key == 0x05 && sshdr->asc == 0x04 &&
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sshdr->ascq == 0x00) {
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/*
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* Array based copy in progress -- do not send
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* mode_select or copy will be aborted mid-stream.
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*/
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sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in "
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"progress while sending CLARiiON trespass "
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"command.\n", CLARIION_NAME);
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err = SCSI_DH_DEV_TEMP_BUSY;
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} else if (sshdr->sense_key == 0x02 && sshdr->asc == 0x04 &&
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sshdr->ascq == 0x03) {
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/*
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* LUN Not Ready - Manual Intervention Required
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* indicates in-progress ucode upgrade (NDU).
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*/
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sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress "
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"ucode upgrade NDU operation while sending "
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"CLARiiON trespass command.\n", CLARIION_NAME);
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err = SCSI_DH_DEV_TEMP_BUSY;
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} else
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err = SCSI_DH_DEV_FAILED;
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return err;
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}
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static int parse_sp_info_reply(struct scsi_device *sdev,
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struct clariion_dh_data *csdev)
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{
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int err = SCSI_DH_OK;
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/* check for in-progress ucode upgrade (NDU) */
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if (csdev->buffer[48] != 0) {
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sdev_printk(KERN_NOTICE, sdev, "%s: Detected in-progress "
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"ucode upgrade NDU operation while finding "
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"current active SP.", CLARIION_NAME);
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err = SCSI_DH_DEV_TEMP_BUSY;
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goto out;
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}
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if (csdev->buffer[4] > 2) {
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/* Invalid buffer format */
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sdev_printk(KERN_NOTICE, sdev,
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"%s: invalid VPD page 0xC0 format\n",
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CLARIION_NAME);
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err = SCSI_DH_NOSYS;
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goto out;
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}
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switch (csdev->buffer[28] & 0x0f) {
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case 6:
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sdev_printk(KERN_NOTICE, sdev,
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"%s: ALUA failover mode detected\n",
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CLARIION_NAME);
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break;
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case 4:
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/* Linux failover */
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break;
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default:
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sdev_printk(KERN_WARNING, sdev,
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"%s: Invalid failover mode %d\n",
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CLARIION_NAME, csdev->buffer[28] & 0x0f);
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err = SCSI_DH_NOSYS;
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goto out;
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}
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csdev->default_sp = csdev->buffer[5];
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csdev->lun_state = csdev->buffer[4];
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csdev->current_sp = csdev->buffer[8];
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csdev->port = csdev->buffer[7];
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if (csdev->lun_state == CLARIION_LUN_OWNED)
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sdev->access_state = SCSI_ACCESS_STATE_OPTIMAL;
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else
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sdev->access_state = SCSI_ACCESS_STATE_STANDBY;
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if (csdev->default_sp == csdev->current_sp)
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sdev->access_state |= SCSI_ACCESS_STATE_PREFERRED;
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out:
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return err;
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}
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#define emc_default_str "FC (Legacy)"
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static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer)
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{
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unsigned char len = buffer[4] + 5;
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char *sp_model = NULL;
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unsigned char sp_len, serial_len;
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if (len < 160) {
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sdev_printk(KERN_WARNING, sdev,
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"%s: Invalid information section length %d\n",
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CLARIION_NAME, len);
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/* Check for old FC arrays */
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if (!strncmp(buffer + 8, "DGC", 3)) {
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/* Old FC array, not supporting extended information */
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sp_model = emc_default_str;
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}
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goto out;
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}
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/*
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* Parse extended information for SP model number
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*/
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serial_len = buffer[160];
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if (serial_len == 0 || serial_len + 161 > len) {
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sdev_printk(KERN_WARNING, sdev,
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"%s: Invalid array serial number length %d\n",
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CLARIION_NAME, serial_len);
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goto out;
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}
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sp_len = buffer[99];
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if (sp_len == 0 || serial_len + sp_len + 161 > len) {
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sdev_printk(KERN_WARNING, sdev,
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"%s: Invalid model number length %d\n",
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CLARIION_NAME, sp_len);
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goto out;
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}
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sp_model = &buffer[serial_len + 161];
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/* Strip whitespace at the end */
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while (sp_len > 1 && sp_model[sp_len - 1] == ' ')
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sp_len--;
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sp_model[sp_len] = '\0';
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out:
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return sp_model;
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}
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static int send_trespass_cmd(struct scsi_device *sdev,
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struct clariion_dh_data *csdev)
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{
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unsigned char *page22;
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unsigned char cdb[MAX_COMMAND_SIZE];
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int err, res = SCSI_DH_OK, len;
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struct scsi_sense_hdr sshdr;
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blk_opf_t opf = REQ_OP_DRV_OUT | REQ_FAILFAST_DEV |
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REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER;
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const struct scsi_exec_args exec_args = {
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.sshdr = &sshdr,
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};
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if (csdev->flags & CLARIION_SHORT_TRESPASS) {
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page22 = short_trespass;
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if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
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/* Set Honor Reservations bit */
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page22[6] |= 0x80;
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len = sizeof(short_trespass);
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cdb[0] = MODE_SELECT;
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cdb[1] = 0x10;
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cdb[4] = len;
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} else {
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page22 = long_trespass;
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if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
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/* Set Honor Reservations bit */
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page22[10] |= 0x80;
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len = sizeof(long_trespass);
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cdb[0] = MODE_SELECT_10;
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cdb[8] = len;
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}
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BUG_ON((len > CLARIION_BUFFER_SIZE));
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memcpy(csdev->buffer, page22, len);
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err = scsi_execute_cmd(sdev, cdb, opf, csdev->buffer, len,
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CLARIION_TIMEOUT * HZ, CLARIION_RETRIES,
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&exec_args);
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if (err) {
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if (scsi_sense_valid(&sshdr))
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res = trespass_endio(sdev, &sshdr);
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else {
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sdev_printk(KERN_INFO, sdev,
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"%s: failed to send MODE SELECT: %x\n",
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CLARIION_NAME, err);
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res = SCSI_DH_IO;
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}
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}
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return res;
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}
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static enum scsi_disposition clariion_check_sense(struct scsi_device *sdev,
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struct scsi_sense_hdr *sense_hdr)
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{
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switch (sense_hdr->sense_key) {
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case NOT_READY:
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if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03)
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/*
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* LUN Not Ready - Manual Intervention Required
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* indicates this is a passive path.
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*
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* FIXME: However, if this is seen and EVPD C0
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* indicates that this is due to a NDU in
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* progress, we should set FAIL_PATH too.
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* This indicates we might have to do a SCSI
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* inquiry in the end_io path. Ugh.
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*
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* Can return FAILED only when we want the error
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* recovery process to kick in.
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*/
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return SUCCESS;
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break;
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case ILLEGAL_REQUEST:
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if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01)
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/*
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* An array based copy is in progress. Do not
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* fail the path, do not bypass to another PG,
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* do not retry. Fail the IO immediately.
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* (Actually this is the same conclusion as in
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* the default handler, but lets make sure.)
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*
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* Can return FAILED only when we want the error
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* recovery process to kick in.
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*/
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return SUCCESS;
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break;
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case UNIT_ATTENTION:
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if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
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/*
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* Unit Attention Code. This is the first IO
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* to the new path, so just retry.
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*/
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return ADD_TO_MLQUEUE;
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break;
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}
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return SCSI_RETURN_NOT_HANDLED;
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}
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static blk_status_t clariion_prep_fn(struct scsi_device *sdev,
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struct request *req)
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{
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struct clariion_dh_data *h = sdev->handler_data;
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if (h->lun_state != CLARIION_LUN_OWNED) {
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req->rq_flags |= RQF_QUIET;
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return BLK_STS_IOERR;
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}
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return BLK_STS_OK;
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}
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static int clariion_std_inquiry(struct scsi_device *sdev,
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struct clariion_dh_data *csdev)
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{
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int err = SCSI_DH_OK;
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char *sp_model;
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sp_model = parse_sp_model(sdev, sdev->inquiry);
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if (!sp_model) {
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err = SCSI_DH_DEV_UNSUPP;
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goto out;
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}
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/*
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* FC Series arrays do not support long trespass
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*/
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if (!strlen(sp_model) || !strncmp(sp_model, "FC",2))
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csdev->flags |= CLARIION_SHORT_TRESPASS;
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sdev_printk(KERN_INFO, sdev,
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|
|
"%s: detected Clariion %s, flags %x\n",
|
||
|
|
CLARIION_NAME, sp_model, csdev->flags);
|
||
|
|
out:
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int clariion_send_inquiry(struct scsi_device *sdev,
|
||
|
|
struct clariion_dh_data *csdev)
|
||
|
|
{
|
||
|
|
int err = SCSI_DH_IO;
|
||
|
|
|
||
|
|
if (!scsi_get_vpd_page(sdev, 0xC0, csdev->buffer,
|
||
|
|
CLARIION_BUFFER_SIZE))
|
||
|
|
err = parse_sp_info_reply(sdev, csdev);
|
||
|
|
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int clariion_activate(struct scsi_device *sdev,
|
||
|
|
activate_complete fn, void *data)
|
||
|
|
{
|
||
|
|
struct clariion_dh_data *csdev = sdev->handler_data;
|
||
|
|
int result;
|
||
|
|
|
||
|
|
result = clariion_send_inquiry(sdev, csdev);
|
||
|
|
if (result != SCSI_DH_OK)
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
if (csdev->lun_state == CLARIION_LUN_OWNED)
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
result = send_trespass_cmd(sdev, csdev);
|
||
|
|
if (result != SCSI_DH_OK)
|
||
|
|
goto done;
|
||
|
|
sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n",
|
||
|
|
CLARIION_NAME,
|
||
|
|
csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" );
|
||
|
|
|
||
|
|
/* Update status */
|
||
|
|
result = clariion_send_inquiry(sdev, csdev);
|
||
|
|
if (result != SCSI_DH_OK)
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
done:
|
||
|
|
sdev_printk(KERN_INFO, sdev,
|
||
|
|
"%s: at SP %c Port %d (%s, default SP %c)\n",
|
||
|
|
CLARIION_NAME, csdev->current_sp + 'A',
|
||
|
|
csdev->port, lun_state[csdev->lun_state],
|
||
|
|
csdev->default_sp + 'A');
|
||
|
|
|
||
|
|
if (fn)
|
||
|
|
fn(data, result);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
/*
|
||
|
|
* params - parameters in the following format
|
||
|
|
* "no_of_params\0param1\0param2\0param3\0...\0"
|
||
|
|
* for example, string for 2 parameters with value 10 and 21
|
||
|
|
* is specified as "2\010\021\0".
|
||
|
|
*/
|
||
|
|
static int clariion_set_params(struct scsi_device *sdev, const char *params)
|
||
|
|
{
|
||
|
|
struct clariion_dh_data *csdev = sdev->handler_data;
|
||
|
|
unsigned int hr = 0, st = 0, argc;
|
||
|
|
const char *p = params;
|
||
|
|
int result = SCSI_DH_OK;
|
||
|
|
|
||
|
|
if ((sscanf(params, "%u", &argc) != 1) || (argc != 2))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
while (*p++)
|
||
|
|
;
|
||
|
|
if ((sscanf(p, "%u", &st) != 1) || (st > 1))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
while (*p++)
|
||
|
|
;
|
||
|
|
if ((sscanf(p, "%u", &hr) != 1) || (hr > 1))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (st)
|
||
|
|
csdev->flags |= CLARIION_SHORT_TRESPASS;
|
||
|
|
else
|
||
|
|
csdev->flags &= ~CLARIION_SHORT_TRESPASS;
|
||
|
|
|
||
|
|
if (hr)
|
||
|
|
csdev->flags |= CLARIION_HONOR_RESERVATIONS;
|
||
|
|
else
|
||
|
|
csdev->flags &= ~CLARIION_HONOR_RESERVATIONS;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If this path is owned, we have to send a trespass command
|
||
|
|
* with the new parameters. If not, simply return. Next trespass
|
||
|
|
* command would use the parameters.
|
||
|
|
*/
|
||
|
|
if (csdev->lun_state != CLARIION_LUN_OWNED)
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
csdev->lun_state = CLARIION_LUN_UNINITIALIZED;
|
||
|
|
result = send_trespass_cmd(sdev, csdev);
|
||
|
|
if (result != SCSI_DH_OK)
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
/* Update status */
|
||
|
|
result = clariion_send_inquiry(sdev, csdev);
|
||
|
|
|
||
|
|
done:
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int clariion_bus_attach(struct scsi_device *sdev)
|
||
|
|
{
|
||
|
|
struct clariion_dh_data *h;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
h = kzalloc(sizeof(*h) , GFP_KERNEL);
|
||
|
|
if (!h)
|
||
|
|
return SCSI_DH_NOMEM;
|
||
|
|
h->lun_state = CLARIION_LUN_UNINITIALIZED;
|
||
|
|
h->default_sp = CLARIION_UNBOUND_LU;
|
||
|
|
h->current_sp = CLARIION_UNBOUND_LU;
|
||
|
|
|
||
|
|
err = clariion_std_inquiry(sdev, h);
|
||
|
|
if (err != SCSI_DH_OK)
|
||
|
|
goto failed;
|
||
|
|
|
||
|
|
err = clariion_send_inquiry(sdev, h);
|
||
|
|
if (err != SCSI_DH_OK)
|
||
|
|
goto failed;
|
||
|
|
|
||
|
|
sdev_printk(KERN_INFO, sdev,
|
||
|
|
"%s: connected to SP %c Port %d (%s, default SP %c)\n",
|
||
|
|
CLARIION_NAME, h->current_sp + 'A',
|
||
|
|
h->port, lun_state[h->lun_state],
|
||
|
|
h->default_sp + 'A');
|
||
|
|
|
||
|
|
sdev->handler_data = h;
|
||
|
|
return SCSI_DH_OK;
|
||
|
|
|
||
|
|
failed:
|
||
|
|
kfree(h);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void clariion_bus_detach(struct scsi_device *sdev)
|
||
|
|
{
|
||
|
|
kfree(sdev->handler_data);
|
||
|
|
sdev->handler_data = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct scsi_device_handler clariion_dh = {
|
||
|
|
.name = CLARIION_NAME,
|
||
|
|
.module = THIS_MODULE,
|
||
|
|
.attach = clariion_bus_attach,
|
||
|
|
.detach = clariion_bus_detach,
|
||
|
|
.check_sense = clariion_check_sense,
|
||
|
|
.activate = clariion_activate,
|
||
|
|
.prep_fn = clariion_prep_fn,
|
||
|
|
.set_params = clariion_set_params,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init clariion_init(void)
|
||
|
|
{
|
||
|
|
int r;
|
||
|
|
|
||
|
|
r = scsi_register_device_handler(&clariion_dh);
|
||
|
|
if (r != 0)
|
||
|
|
printk(KERN_ERR "%s: Failed to register scsi device handler.",
|
||
|
|
CLARIION_NAME);
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit clariion_exit(void)
|
||
|
|
{
|
||
|
|
scsi_unregister_device_handler(&clariion_dh);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(clariion_init);
|
||
|
|
module_exit(clariion_exit);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("EMC CX/AX/FC-family driver");
|
||
|
|
MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>");
|
||
|
|
MODULE_LICENSE("GPL");
|