From b78205c93297b821974deaf607bc2efd89842621 Mon Sep 17 00:00:00 2001 From: Hannes Reinecke Date: Thu, 3 Nov 2016 14:20:22 +0100 Subject: [PATCH] scsi_dh_emc: switch to scsi_execute_req_flags() Switch to scsi_execute_req_flags() and scsi_get_vpd_page() instead of open-coding it. Using scsi_execute_req_flags() will set REQ_QUIET and REQ_PREEMPT, but this is okay as we're evaluating the errors anyway and should be able to send the command even if the device is quiesced. Signed-off-by: Hannes Reinecke Signed-off-by: Christoph Hellwig Acked-by: Martin K. Petersen Signed-off-by: Jens Axboe --- drivers/scsi/device_handler/scsi_dh_emc.c | 247 +++++----------------- 1 file changed, 56 insertions(+), 191 deletions(-) diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c index 5b80746980b8..4a7679f6c73d 100644 --- a/drivers/scsi/device_handler/scsi_dh_emc.c +++ b/drivers/scsi/device_handler/scsi_dh_emc.c @@ -87,12 +87,6 @@ struct clariion_dh_data { * I/O buffer for both MODE_SELECT and INQUIRY commands. */ unsigned char buffer[CLARIION_BUFFER_SIZE]; - /* - * SCSI sense buffer for commands -- assumes serial issuance - * and completion sequence of all commands for same multipath. - */ - unsigned char sense[SCSI_SENSE_BUFFERSIZE]; - unsigned int senselen; /* * LUN state */ @@ -116,44 +110,38 @@ struct clariion_dh_data { /* * Parse MODE_SELECT cmd reply. */ -static int trespass_endio(struct scsi_device *sdev, char *sense) +static int trespass_endio(struct scsi_device *sdev, + struct scsi_sense_hdr *sshdr) { int err = SCSI_DH_IO; - struct scsi_sense_hdr sshdr; - - if (!scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) { - sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, " - "0x%2x, 0x%2x while sending CLARiiON trespass " - "command.\n", CLARIION_NAME, sshdr.sense_key, - sshdr.asc, sshdr.ascq); - if ((sshdr.sense_key == 0x05) && (sshdr.asc == 0x04) && - (sshdr.ascq == 0x00)) { - /* - * Array based copy in progress -- do not send - * mode_select or copy will be aborted mid-stream. - */ - sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in " - "progress while sending CLARiiON trespass " - "command.\n", CLARIION_NAME); - err = SCSI_DH_DEV_TEMP_BUSY; - } else if ((sshdr.sense_key == 0x02) && (sshdr.asc == 0x04) && - (sshdr.ascq == 0x03)) { - /* - * LUN Not Ready - Manual Intervention Required - * indicates in-progress ucode upgrade (NDU). - */ - sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress " - "ucode upgrade NDU operation while sending " - "CLARiiON trespass command.\n", CLARIION_NAME); - err = SCSI_DH_DEV_TEMP_BUSY; - } else - err = SCSI_DH_DEV_FAILED; - } else { - sdev_printk(KERN_INFO, sdev, - "%s: failed to send MODE SELECT, no sense available\n", - CLARIION_NAME); - } + sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, " + "0x%2x, 0x%2x while sending CLARiiON trespass " + "command.\n", CLARIION_NAME, sshdr->sense_key, + sshdr->asc, sshdr->ascq); + + if (sshdr->sense_key == 0x05 && sshdr->asc == 0x04 && + sshdr->ascq == 0x00) { + /* + * Array based copy in progress -- do not send + * mode_select or copy will be aborted mid-stream. + */ + sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in " + "progress while sending CLARiiON trespass " + "command.\n", CLARIION_NAME); + err = SCSI_DH_DEV_TEMP_BUSY; + } else if (sshdr->sense_key == 0x02 && sshdr->asc == 0x04 && + sshdr->ascq == 0x03) { + /* + * LUN Not Ready - Manual Intervention Required + * indicates in-progress ucode upgrade (NDU). + */ + sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress " + "ucode upgrade NDU operation while sending " + "CLARiiON trespass command.\n", CLARIION_NAME); + err = SCSI_DH_DEV_TEMP_BUSY; + } else + err = SCSI_DH_DEV_FAILED; return err; } @@ -257,103 +245,15 @@ out: return sp_model; } -/* - * Get block request for REQ_BLOCK_PC command issued to path. Currently - * limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands. - * - * Uses data and sense buffers in hardware handler context structure and - * assumes serial servicing of commands, both issuance and completion. - */ -static struct request *get_req(struct scsi_device *sdev, int cmd, - unsigned char *buffer) -{ - struct request *rq; - int len = 0; - - rq = blk_get_request(sdev->request_queue, - (cmd != INQUIRY) ? WRITE : READ, GFP_NOIO); - if (IS_ERR(rq)) { - sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed"); - return NULL; - } - - blk_rq_set_block_pc(rq); - rq->cmd_len = COMMAND_SIZE(cmd); - rq->cmd[0] = cmd; - - switch (cmd) { - case MODE_SELECT: - len = sizeof(short_trespass); - rq->cmd[1] = 0x10; - rq->cmd[4] = len; - break; - case MODE_SELECT_10: - len = sizeof(long_trespass); - rq->cmd[1] = 0x10; - rq->cmd[8] = len; - break; - case INQUIRY: - len = CLARIION_BUFFER_SIZE; - rq->cmd[4] = len; - memset(buffer, 0, len); - break; - default: - BUG_ON(1); - break; - } - - rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | - REQ_FAILFAST_DRIVER; - rq->timeout = CLARIION_TIMEOUT; - rq->retries = CLARIION_RETRIES; - - if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) { - blk_put_request(rq); - return NULL; - } - - return rq; -} - -static int send_inquiry_cmd(struct scsi_device *sdev, int page, - struct clariion_dh_data *csdev) -{ - struct request *rq = get_req(sdev, INQUIRY, csdev->buffer); - int err; - - if (!rq) - return SCSI_DH_RES_TEMP_UNAVAIL; - - rq->sense = csdev->sense; - memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); - rq->sense_len = csdev->senselen = 0; - - rq->cmd[0] = INQUIRY; - if (page != 0) { - rq->cmd[1] = 1; - rq->cmd[2] = page; - } - err = blk_execute_rq(sdev->request_queue, NULL, rq, 1); - if (err == -EIO) { - sdev_printk(KERN_INFO, sdev, - "%s: failed to send %s INQUIRY: %x\n", - CLARIION_NAME, page?"EVPD":"standard", - rq->errors); - csdev->senselen = rq->sense_len; - err = SCSI_DH_IO; - } - - blk_put_request(rq); - - return err; -} - static int send_trespass_cmd(struct scsi_device *sdev, struct clariion_dh_data *csdev) { - struct request *rq; unsigned char *page22; - int err, len, cmd; + unsigned char cdb[COMMAND_SIZE(MODE_SELECT)]; + int err, res = SCSI_DH_OK, len; + struct scsi_sense_hdr sshdr; + u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | + REQ_FAILFAST_DRIVER; if (csdev->flags & CLARIION_SHORT_TRESPASS) { page22 = short_trespass; @@ -361,40 +261,37 @@ static int send_trespass_cmd(struct scsi_device *sdev, /* Set Honor Reservations bit */ page22[6] |= 0x80; len = sizeof(short_trespass); - cmd = MODE_SELECT; + cdb[0] = MODE_SELECT; + cdb[1] = 0x10; + cdb[4] = len; } else { page22 = long_trespass; if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS)) /* Set Honor Reservations bit */ page22[10] |= 0x80; len = sizeof(long_trespass); - cmd = MODE_SELECT_10; + cdb[0] = MODE_SELECT_10; + cdb[8] = len; } BUG_ON((len > CLARIION_BUFFER_SIZE)); memcpy(csdev->buffer, page22, len); - rq = get_req(sdev, cmd, csdev->buffer); - if (!rq) - return SCSI_DH_RES_TEMP_UNAVAIL; - - rq->sense = csdev->sense; - memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); - rq->sense_len = csdev->senselen = 0; - - err = blk_execute_rq(sdev->request_queue, NULL, rq, 1); - if (err == -EIO) { - if (rq->sense_len) { - err = trespass_endio(sdev, csdev->sense); - } else { + err = scsi_execute_req_flags(sdev, cdb, DMA_TO_DEVICE, + csdev->buffer, len, &sshdr, + CLARIION_TIMEOUT * HZ, CLARIION_RETRIES, + NULL, req_flags, 0); + if (err) { + if (scsi_sense_valid(&sshdr)) + res = trespass_endio(sdev, &sshdr); + else { sdev_printk(KERN_INFO, sdev, "%s: failed to send MODE SELECT: %x\n", - CLARIION_NAME, rq->errors); + CLARIION_NAME, err); + res = SCSI_DH_IO; } } - blk_put_request(rq); - - return err; + return res; } static int clariion_check_sense(struct scsi_device *sdev, @@ -464,21 +361,7 @@ static int clariion_std_inquiry(struct scsi_device *sdev, int err; char *sp_model; - err = send_inquiry_cmd(sdev, 0, csdev); - if (err != SCSI_DH_OK && csdev->senselen) { - struct scsi_sense_hdr sshdr; - - if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE, - &sshdr)) { - sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code " - "%02x/%02x/%02x\n", CLARIION_NAME, - sshdr.sense_key, sshdr.asc, sshdr.ascq); - } - err = SCSI_DH_IO; - goto out; - } - - sp_model = parse_sp_model(sdev, csdev->buffer); + sp_model = parse_sp_model(sdev, sdev->inquiry); if (!sp_model) { err = SCSI_DH_DEV_UNSUPP; goto out; @@ -500,30 +383,12 @@ out: static int clariion_send_inquiry(struct scsi_device *sdev, struct clariion_dh_data *csdev) { - int err, retry = CLARIION_RETRIES; - -retry: - err = send_inquiry_cmd(sdev, 0xC0, csdev); - if (err != SCSI_DH_OK && csdev->senselen) { - struct scsi_sense_hdr sshdr; - - err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE, - &sshdr); - if (!err) - return SCSI_DH_IO; - - err = clariion_check_sense(sdev, &sshdr); - if (retry > 0 && err == ADD_TO_MLQUEUE) { - retry--; - goto retry; - } - sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code " - "%02x/%02x/%02x\n", CLARIION_NAME, - sshdr.sense_key, sshdr.asc, sshdr.ascq); - err = SCSI_DH_IO; - } else { + 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; } -- 2.25.1