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1110 lines
28 KiB
1110 lines
28 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/******************************************************************************* |
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* Filename: target_core_pscsi.c |
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* |
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* This file contains the generic target mode <-> Linux SCSI subsystem plugin. |
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* |
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* (c) Copyright 2003-2013 Datera, Inc. |
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* |
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* Nicholas A. Bellinger <[email protected]> |
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* |
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******************************************************************************/ |
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|
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#include <linux/string.h> |
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#include <linux/parser.h> |
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#include <linux/timer.h> |
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#include <linux/blkdev.h> |
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#include <linux/blk_types.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/genhd.h> |
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#include <linux/cdrom.h> |
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#include <linux/ratelimit.h> |
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#include <linux/module.h> |
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#include <asm/unaligned.h> |
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|
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_host.h> |
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#include <scsi/scsi_tcq.h> |
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|
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#include <target/target_core_base.h> |
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#include <target/target_core_backend.h> |
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|
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#include "target_core_alua.h" |
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#include "target_core_internal.h" |
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#include "target_core_pscsi.h" |
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|
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static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev) |
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{ |
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return container_of(dev, struct pscsi_dev_virt, dev); |
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} |
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|
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static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd); |
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static void pscsi_req_done(struct request *, blk_status_t); |
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|
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/* pscsi_attach_hba(): |
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* |
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* pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host. |
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* from the passed SCSI Host ID. |
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*/ |
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static int pscsi_attach_hba(struct se_hba *hba, u32 host_id) |
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{ |
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struct pscsi_hba_virt *phv; |
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|
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phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL); |
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if (!phv) { |
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pr_err("Unable to allocate struct pscsi_hba_virt\n"); |
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return -ENOMEM; |
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} |
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phv->phv_host_id = host_id; |
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phv->phv_mode = PHV_VIRTUAL_HOST_ID; |
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|
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hba->hba_ptr = phv; |
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|
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pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on" |
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" Generic Target Core Stack %s\n", hba->hba_id, |
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PSCSI_VERSION, TARGET_CORE_VERSION); |
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pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n", |
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hba->hba_id); |
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|
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return 0; |
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} |
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|
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static void pscsi_detach_hba(struct se_hba *hba) |
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{ |
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struct pscsi_hba_virt *phv = hba->hba_ptr; |
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struct Scsi_Host *scsi_host = phv->phv_lld_host; |
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|
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if (scsi_host) { |
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scsi_host_put(scsi_host); |
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|
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pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from" |
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" Generic Target Core\n", hba->hba_id, |
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(scsi_host->hostt->name) ? (scsi_host->hostt->name) : |
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"Unknown"); |
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} else |
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pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA" |
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" from Generic Target Core\n", hba->hba_id); |
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|
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kfree(phv); |
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hba->hba_ptr = NULL; |
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} |
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|
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static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag) |
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{ |
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struct pscsi_hba_virt *phv = hba->hba_ptr; |
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struct Scsi_Host *sh = phv->phv_lld_host; |
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/* |
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* Release the struct Scsi_Host |
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*/ |
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if (!mode_flag) { |
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if (!sh) |
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return 0; |
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|
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phv->phv_lld_host = NULL; |
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phv->phv_mode = PHV_VIRTUAL_HOST_ID; |
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|
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pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough" |
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" %s\n", hba->hba_id, (sh->hostt->name) ? |
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(sh->hostt->name) : "Unknown"); |
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|
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scsi_host_put(sh); |
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return 0; |
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} |
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/* |
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* Otherwise, locate struct Scsi_Host from the original passed |
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* pSCSI Host ID and enable for phba mode |
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*/ |
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sh = scsi_host_lookup(phv->phv_host_id); |
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if (!sh) { |
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pr_err("pSCSI: Unable to locate SCSI Host for" |
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" phv_host_id: %d\n", phv->phv_host_id); |
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return -EINVAL; |
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} |
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|
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phv->phv_lld_host = sh; |
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phv->phv_mode = PHV_LLD_SCSI_HOST_NO; |
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|
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pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n", |
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hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown"); |
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|
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return 1; |
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} |
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|
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static void pscsi_tape_read_blocksize(struct se_device *dev, |
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struct scsi_device *sdev) |
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{ |
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unsigned char cdb[MAX_COMMAND_SIZE], *buf; |
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int ret; |
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|
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buf = kzalloc(12, GFP_KERNEL); |
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if (!buf) |
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goto out_free; |
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|
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memset(cdb, 0, MAX_COMMAND_SIZE); |
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cdb[0] = MODE_SENSE; |
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cdb[4] = 0x0c; /* 12 bytes */ |
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|
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ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL, |
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HZ, 1, NULL); |
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if (ret) |
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goto out_free; |
|
|
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/* |
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* If MODE_SENSE still returns zero, set the default value to 1024. |
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*/ |
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sdev->sector_size = get_unaligned_be24(&buf[9]); |
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out_free: |
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if (!sdev->sector_size) |
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sdev->sector_size = 1024; |
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|
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kfree(buf); |
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} |
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|
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static void |
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pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn) |
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{ |
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if (sdev->inquiry_len < INQUIRY_LEN) |
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return; |
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/* |
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* Use sdev->inquiry data from drivers/scsi/scsi_scan.c:scsi_add_lun() |
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*/ |
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BUILD_BUG_ON(sizeof(wwn->vendor) != INQUIRY_VENDOR_LEN + 1); |
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snprintf(wwn->vendor, sizeof(wwn->vendor), |
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"%." __stringify(INQUIRY_VENDOR_LEN) "s", sdev->vendor); |
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BUILD_BUG_ON(sizeof(wwn->model) != INQUIRY_MODEL_LEN + 1); |
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snprintf(wwn->model, sizeof(wwn->model), |
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"%." __stringify(INQUIRY_MODEL_LEN) "s", sdev->model); |
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BUILD_BUG_ON(sizeof(wwn->revision) != INQUIRY_REVISION_LEN + 1); |
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snprintf(wwn->revision, sizeof(wwn->revision), |
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"%." __stringify(INQUIRY_REVISION_LEN) "s", sdev->rev); |
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} |
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|
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static int |
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pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn) |
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{ |
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unsigned char cdb[MAX_COMMAND_SIZE], *buf; |
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int ret; |
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|
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buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); |
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if (!buf) |
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return -ENOMEM; |
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memset(cdb, 0, MAX_COMMAND_SIZE); |
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cdb[0] = INQUIRY; |
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cdb[1] = 0x01; /* Query VPD */ |
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cdb[2] = 0x80; /* Unit Serial Number */ |
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put_unaligned_be16(INQUIRY_VPD_SERIAL_LEN, &cdb[3]); |
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ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, |
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INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL); |
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if (ret) |
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goto out_free; |
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|
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snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]); |
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wwn->t10_dev->dev_flags |= DF_FIRMWARE_VPD_UNIT_SERIAL; |
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|
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kfree(buf); |
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return 0; |
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|
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out_free: |
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kfree(buf); |
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return -EPERM; |
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} |
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|
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static void |
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pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev, |
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struct t10_wwn *wwn) |
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{ |
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unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83; |
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int ident_len, page_len, off = 4, ret; |
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struct t10_vpd *vpd; |
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|
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buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); |
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if (!buf) |
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return; |
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|
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memset(cdb, 0, MAX_COMMAND_SIZE); |
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cdb[0] = INQUIRY; |
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cdb[1] = 0x01; /* Query VPD */ |
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cdb[2] = 0x83; /* Device Identifier */ |
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put_unaligned_be16(INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, &cdb[3]); |
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ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, |
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INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, |
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NULL, HZ, 1, NULL); |
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if (ret) |
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goto out; |
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|
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page_len = get_unaligned_be16(&buf[2]); |
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while (page_len > 0) { |
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/* Grab a pointer to the Identification descriptor */ |
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page_83 = &buf[off]; |
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ident_len = page_83[3]; |
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if (!ident_len) { |
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pr_err("page_83[3]: identifier" |
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" length zero!\n"); |
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break; |
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} |
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pr_debug("T10 VPD Identifier Length: %d\n", ident_len); |
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|
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vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL); |
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if (!vpd) { |
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pr_err("Unable to allocate memory for" |
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" struct t10_vpd\n"); |
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goto out; |
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} |
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INIT_LIST_HEAD(&vpd->vpd_list); |
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|
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transport_set_vpd_proto_id(vpd, page_83); |
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transport_set_vpd_assoc(vpd, page_83); |
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|
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if (transport_set_vpd_ident_type(vpd, page_83) < 0) { |
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off += (ident_len + 4); |
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page_len -= (ident_len + 4); |
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kfree(vpd); |
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continue; |
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} |
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if (transport_set_vpd_ident(vpd, page_83) < 0) { |
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off += (ident_len + 4); |
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page_len -= (ident_len + 4); |
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kfree(vpd); |
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continue; |
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} |
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list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list); |
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off += (ident_len + 4); |
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page_len -= (ident_len + 4); |
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} |
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|
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out: |
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kfree(buf); |
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} |
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static int pscsi_add_device_to_list(struct se_device *dev, |
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struct scsi_device *sd) |
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{ |
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struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); |
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struct request_queue *q = sd->request_queue; |
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pdv->pdv_sd = sd; |
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|
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if (!sd->queue_depth) { |
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sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH; |
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|
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pr_err("Set broken SCSI Device %d:%d:%llu" |
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" queue_depth to %d\n", sd->channel, sd->id, |
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sd->lun, sd->queue_depth); |
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} |
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|
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dev->dev_attrib.hw_block_size = |
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min_not_zero((int)sd->sector_size, 512); |
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dev->dev_attrib.hw_max_sectors = |
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min_not_zero(sd->host->max_sectors, queue_max_hw_sectors(q)); |
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dev->dev_attrib.hw_queue_depth = sd->queue_depth; |
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|
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/* |
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* Setup our standard INQUIRY info into se_dev->t10_wwn |
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*/ |
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pscsi_set_inquiry_info(sd, &dev->t10_wwn); |
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|
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/* |
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* Locate VPD WWN Information used for various purposes within |
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* the Storage Engine. |
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*/ |
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if (!pscsi_get_inquiry_vpd_serial(sd, &dev->t10_wwn)) { |
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/* |
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* If VPD Unit Serial returned GOOD status, try |
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* VPD Device Identification page (0x83). |
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*/ |
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pscsi_get_inquiry_vpd_device_ident(sd, &dev->t10_wwn); |
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} |
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|
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/* |
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* For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE. |
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*/ |
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if (sd->type == TYPE_TAPE) { |
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pscsi_tape_read_blocksize(dev, sd); |
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dev->dev_attrib.hw_block_size = sd->sector_size; |
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} |
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return 0; |
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} |
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|
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static struct se_device *pscsi_alloc_device(struct se_hba *hba, |
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const char *name) |
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{ |
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struct pscsi_dev_virt *pdv; |
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|
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pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL); |
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if (!pdv) { |
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pr_err("Unable to allocate memory for struct pscsi_dev_virt\n"); |
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return NULL; |
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} |
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|
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pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name); |
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return &pdv->dev; |
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} |
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|
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/* |
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* Called with struct Scsi_Host->host_lock called. |
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*/ |
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static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd) |
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__releases(sh->host_lock) |
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{ |
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struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; |
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struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); |
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struct Scsi_Host *sh = sd->host; |
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struct block_device *bd; |
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int ret; |
|
|
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if (scsi_device_get(sd)) { |
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pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n", |
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sh->host_no, sd->channel, sd->id, sd->lun); |
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spin_unlock_irq(sh->host_lock); |
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return -EIO; |
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} |
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spin_unlock_irq(sh->host_lock); |
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/* |
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* Claim exclusive struct block_device access to struct scsi_device |
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* for TYPE_DISK and TYPE_ZBC using supplied udev_path |
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*/ |
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bd = blkdev_get_by_path(dev->udev_path, |
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FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv); |
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if (IS_ERR(bd)) { |
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pr_err("pSCSI: blkdev_get_by_path() failed\n"); |
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scsi_device_put(sd); |
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return PTR_ERR(bd); |
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} |
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pdv->pdv_bd = bd; |
|
|
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ret = pscsi_add_device_to_list(dev, sd); |
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if (ret) { |
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blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); |
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scsi_device_put(sd); |
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return ret; |
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} |
|
|
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pr_debug("CORE_PSCSI[%d] - Added TYPE_%s for %d:%d:%d:%llu\n", |
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phv->phv_host_id, sd->type == TYPE_DISK ? "DISK" : "ZBC", |
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sh->host_no, sd->channel, sd->id, sd->lun); |
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return 0; |
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} |
|
|
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/* |
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* Called with struct Scsi_Host->host_lock called. |
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*/ |
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static int pscsi_create_type_nondisk(struct se_device *dev, struct scsi_device *sd) |
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__releases(sh->host_lock) |
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{ |
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struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; |
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struct Scsi_Host *sh = sd->host; |
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int ret; |
|
|
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if (scsi_device_get(sd)) { |
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pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n", |
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sh->host_no, sd->channel, sd->id, sd->lun); |
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spin_unlock_irq(sh->host_lock); |
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return -EIO; |
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} |
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spin_unlock_irq(sh->host_lock); |
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|
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ret = pscsi_add_device_to_list(dev, sd); |
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if (ret) { |
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scsi_device_put(sd); |
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return ret; |
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} |
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pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n", |
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phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, |
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sd->channel, sd->id, sd->lun); |
|
|
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return 0; |
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} |
|
|
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static int pscsi_configure_device(struct se_device *dev) |
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{ |
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struct se_hba *hba = dev->se_hba; |
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struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); |
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struct scsi_device *sd; |
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struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; |
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struct Scsi_Host *sh = phv->phv_lld_host; |
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int legacy_mode_enable = 0; |
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int ret; |
|
|
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if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) || |
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!(pdv->pdv_flags & PDF_HAS_TARGET_ID) || |
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!(pdv->pdv_flags & PDF_HAS_LUN_ID)) { |
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pr_err("Missing scsi_channel_id=, scsi_target_id= and" |
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" scsi_lun_id= parameters\n"); |
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return -EINVAL; |
|
} |
|
|
|
/* |
|
* If not running in PHV_LLD_SCSI_HOST_NO mode, locate the |
|
* struct Scsi_Host we will need to bring the TCM/pSCSI object online |
|
*/ |
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if (!sh) { |
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if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { |
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pr_err("pSCSI: Unable to locate struct" |
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" Scsi_Host for PHV_LLD_SCSI_HOST_NO\n"); |
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return -ENODEV; |
|
} |
|
/* |
|
* For the newer PHV_VIRTUAL_HOST_ID struct scsi_device |
|
* reference, we enforce that udev_path has been set |
|
*/ |
|
if (!(dev->dev_flags & DF_USING_UDEV_PATH)) { |
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pr_err("pSCSI: udev_path attribute has not" |
|
" been set before ENABLE=1\n"); |
|
return -EINVAL; |
|
} |
|
/* |
|
* If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID, |
|
* use the original TCM hba ID to reference Linux/SCSI Host No |
|
* and enable for PHV_LLD_SCSI_HOST_NO mode. |
|
*/ |
|
if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) { |
|
if (hba->dev_count) { |
|
pr_err("pSCSI: Unable to set hba_mode" |
|
" with active devices\n"); |
|
return -EEXIST; |
|
} |
|
|
|
if (pscsi_pmode_enable_hba(hba, 1) != 1) |
|
return -ENODEV; |
|
|
|
legacy_mode_enable = 1; |
|
hba->hba_flags |= HBA_FLAGS_PSCSI_MODE; |
|
sh = phv->phv_lld_host; |
|
} else { |
|
sh = scsi_host_lookup(pdv->pdv_host_id); |
|
if (!sh) { |
|
pr_err("pSCSI: Unable to locate" |
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" pdv_host_id: %d\n", pdv->pdv_host_id); |
|
return -EINVAL; |
|
} |
|
pdv->pdv_lld_host = sh; |
|
} |
|
} else { |
|
if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) { |
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pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while" |
|
" struct Scsi_Host exists\n"); |
|
return -EEXIST; |
|
} |
|
} |
|
|
|
spin_lock_irq(sh->host_lock); |
|
list_for_each_entry(sd, &sh->__devices, siblings) { |
|
if ((pdv->pdv_channel_id != sd->channel) || |
|
(pdv->pdv_target_id != sd->id) || |
|
(pdv->pdv_lun_id != sd->lun)) |
|
continue; |
|
/* |
|
* Functions will release the held struct scsi_host->host_lock |
|
* before calling calling pscsi_add_device_to_list() to register |
|
* struct scsi_device with target_core_mod. |
|
*/ |
|
switch (sd->type) { |
|
case TYPE_DISK: |
|
case TYPE_ZBC: |
|
ret = pscsi_create_type_disk(dev, sd); |
|
break; |
|
default: |
|
ret = pscsi_create_type_nondisk(dev, sd); |
|
break; |
|
} |
|
|
|
if (ret) { |
|
if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) |
|
scsi_host_put(sh); |
|
else if (legacy_mode_enable) { |
|
pscsi_pmode_enable_hba(hba, 0); |
|
hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; |
|
} |
|
pdv->pdv_sd = NULL; |
|
return ret; |
|
} |
|
return 0; |
|
} |
|
spin_unlock_irq(sh->host_lock); |
|
|
|
pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no, |
|
pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id); |
|
|
|
if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) |
|
scsi_host_put(sh); |
|
else if (legacy_mode_enable) { |
|
pscsi_pmode_enable_hba(hba, 0); |
|
hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; |
|
} |
|
|
|
return -ENODEV; |
|
} |
|
|
|
static void pscsi_dev_call_rcu(struct rcu_head *p) |
|
{ |
|
struct se_device *dev = container_of(p, struct se_device, rcu_head); |
|
struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); |
|
|
|
kfree(pdv); |
|
} |
|
|
|
static void pscsi_free_device(struct se_device *dev) |
|
{ |
|
call_rcu(&dev->rcu_head, pscsi_dev_call_rcu); |
|
} |
|
|
|
static void pscsi_destroy_device(struct se_device *dev) |
|
{ |
|
struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); |
|
struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; |
|
struct scsi_device *sd = pdv->pdv_sd; |
|
|
|
if (sd) { |
|
/* |
|
* Release exclusive pSCSI internal struct block_device claim for |
|
* struct scsi_device with TYPE_DISK or TYPE_ZBC |
|
* from pscsi_create_type_disk() |
|
*/ |
|
if ((sd->type == TYPE_DISK || sd->type == TYPE_ZBC) && |
|
pdv->pdv_bd) { |
|
blkdev_put(pdv->pdv_bd, |
|
FMODE_WRITE|FMODE_READ|FMODE_EXCL); |
|
pdv->pdv_bd = NULL; |
|
} |
|
/* |
|
* For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference |
|
* to struct Scsi_Host now. |
|
*/ |
|
if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) && |
|
(phv->phv_lld_host != NULL)) |
|
scsi_host_put(phv->phv_lld_host); |
|
else if (pdv->pdv_lld_host) |
|
scsi_host_put(pdv->pdv_lld_host); |
|
|
|
scsi_device_put(sd); |
|
|
|
pdv->pdv_sd = NULL; |
|
} |
|
} |
|
|
|
static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status, |
|
unsigned char *req_sense) |
|
{ |
|
struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); |
|
struct scsi_device *sd = pdv->pdv_sd; |
|
struct pscsi_plugin_task *pt = cmd->priv; |
|
unsigned char *cdb; |
|
/* |
|
* Special case for REPORT_LUNs handling where pscsi_plugin_task has |
|
* not been allocated because TCM is handling the emulation directly. |
|
*/ |
|
if (!pt) |
|
return; |
|
|
|
cdb = &pt->pscsi_cdb[0]; |
|
/* |
|
* Hack to make sure that Write-Protect modepage is set if R/O mode is |
|
* forced. |
|
*/ |
|
if (!cmd->data_length) |
|
goto after_mode_sense; |
|
|
|
if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) && |
|
scsi_status == SAM_STAT_GOOD) { |
|
bool read_only = target_lun_is_rdonly(cmd); |
|
|
|
if (read_only) { |
|
unsigned char *buf; |
|
|
|
buf = transport_kmap_data_sg(cmd); |
|
if (!buf) { |
|
; /* XXX: TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE */ |
|
} else { |
|
if (cdb[0] == MODE_SENSE_10) { |
|
if (!(buf[3] & 0x80)) |
|
buf[3] |= 0x80; |
|
} else { |
|
if (!(buf[2] & 0x80)) |
|
buf[2] |= 0x80; |
|
} |
|
|
|
transport_kunmap_data_sg(cmd); |
|
} |
|
} |
|
} |
|
after_mode_sense: |
|
|
|
if (sd->type != TYPE_TAPE || !cmd->data_length) |
|
goto after_mode_select; |
|
|
|
/* |
|
* Hack to correctly obtain the initiator requested blocksize for |
|
* TYPE_TAPE. Since this value is dependent upon each tape media, |
|
* struct scsi_device->sector_size will not contain the correct value |
|
* by default, so we go ahead and set it so |
|
* TRANSPORT(dev)->get_blockdev() returns the correct value to the |
|
* storage engine. |
|
*/ |
|
if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) && |
|
scsi_status == SAM_STAT_GOOD) { |
|
unsigned char *buf; |
|
u16 bdl; |
|
u32 blocksize; |
|
|
|
buf = sg_virt(&cmd->t_data_sg[0]); |
|
if (!buf) { |
|
pr_err("Unable to get buf for scatterlist\n"); |
|
goto after_mode_select; |
|
} |
|
|
|
if (cdb[0] == MODE_SELECT) |
|
bdl = buf[3]; |
|
else |
|
bdl = get_unaligned_be16(&buf[6]); |
|
|
|
if (!bdl) |
|
goto after_mode_select; |
|
|
|
if (cdb[0] == MODE_SELECT) |
|
blocksize = get_unaligned_be24(&buf[9]); |
|
else |
|
blocksize = get_unaligned_be24(&buf[13]); |
|
|
|
sd->sector_size = blocksize; |
|
} |
|
after_mode_select: |
|
|
|
if (scsi_status == SAM_STAT_CHECK_CONDITION) { |
|
transport_copy_sense_to_cmd(cmd, req_sense); |
|
|
|
/* |
|
* check for TAPE device reads with |
|
* FM/EOM/ILI set, so that we can get data |
|
* back despite framework assumption that a |
|
* check condition means there is no data |
|
*/ |
|
if (sd->type == TYPE_TAPE && |
|
cmd->data_direction == DMA_FROM_DEVICE) { |
|
/* |
|
* is sense data valid, fixed format, |
|
* and have FM, EOM, or ILI set? |
|
*/ |
|
if (req_sense[0] == 0xf0 && /* valid, fixed format */ |
|
req_sense[2] & 0xe0 && /* FM, EOM, or ILI */ |
|
(req_sense[2] & 0xf) == 0) { /* key==NO_SENSE */ |
|
pr_debug("Tape FM/EOM/ILI status detected. Treat as normal read.\n"); |
|
cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL; |
|
} |
|
} |
|
} |
|
} |
|
|
|
enum { |
|
Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id, |
|
Opt_scsi_lun_id, Opt_err |
|
}; |
|
|
|
static match_table_t tokens = { |
|
{Opt_scsi_host_id, "scsi_host_id=%d"}, |
|
{Opt_scsi_channel_id, "scsi_channel_id=%d"}, |
|
{Opt_scsi_target_id, "scsi_target_id=%d"}, |
|
{Opt_scsi_lun_id, "scsi_lun_id=%d"}, |
|
{Opt_err, NULL} |
|
}; |
|
|
|
static ssize_t pscsi_set_configfs_dev_params(struct se_device *dev, |
|
const char *page, ssize_t count) |
|
{ |
|
struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); |
|
struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; |
|
char *orig, *ptr, *opts; |
|
substring_t args[MAX_OPT_ARGS]; |
|
int ret = 0, arg, token; |
|
|
|
opts = kstrdup(page, GFP_KERNEL); |
|
if (!opts) |
|
return -ENOMEM; |
|
|
|
orig = opts; |
|
|
|
while ((ptr = strsep(&opts, ",\n")) != NULL) { |
|
if (!*ptr) |
|
continue; |
|
|
|
token = match_token(ptr, tokens, args); |
|
switch (token) { |
|
case Opt_scsi_host_id: |
|
if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { |
|
pr_err("PSCSI[%d]: Unable to accept" |
|
" scsi_host_id while phv_mode ==" |
|
" PHV_LLD_SCSI_HOST_NO\n", |
|
phv->phv_host_id); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
ret = match_int(args, &arg); |
|
if (ret) |
|
goto out; |
|
pdv->pdv_host_id = arg; |
|
pr_debug("PSCSI[%d]: Referencing SCSI Host ID:" |
|
" %d\n", phv->phv_host_id, pdv->pdv_host_id); |
|
pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID; |
|
break; |
|
case Opt_scsi_channel_id: |
|
ret = match_int(args, &arg); |
|
if (ret) |
|
goto out; |
|
pdv->pdv_channel_id = arg; |
|
pr_debug("PSCSI[%d]: Referencing SCSI Channel" |
|
" ID: %d\n", phv->phv_host_id, |
|
pdv->pdv_channel_id); |
|
pdv->pdv_flags |= PDF_HAS_CHANNEL_ID; |
|
break; |
|
case Opt_scsi_target_id: |
|
ret = match_int(args, &arg); |
|
if (ret) |
|
goto out; |
|
pdv->pdv_target_id = arg; |
|
pr_debug("PSCSI[%d]: Referencing SCSI Target" |
|
" ID: %d\n", phv->phv_host_id, |
|
pdv->pdv_target_id); |
|
pdv->pdv_flags |= PDF_HAS_TARGET_ID; |
|
break; |
|
case Opt_scsi_lun_id: |
|
ret = match_int(args, &arg); |
|
if (ret) |
|
goto out; |
|
pdv->pdv_lun_id = arg; |
|
pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:" |
|
" %d\n", phv->phv_host_id, pdv->pdv_lun_id); |
|
pdv->pdv_flags |= PDF_HAS_LUN_ID; |
|
break; |
|
default: |
|
break; |
|
} |
|
} |
|
|
|
out: |
|
kfree(orig); |
|
return (!ret) ? count : ret; |
|
} |
|
|
|
static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b) |
|
{ |
|
struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; |
|
struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); |
|
struct scsi_device *sd = pdv->pdv_sd; |
|
unsigned char host_id[16]; |
|
ssize_t bl; |
|
|
|
if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) |
|
snprintf(host_id, 16, "%d", pdv->pdv_host_id); |
|
else |
|
snprintf(host_id, 16, "PHBA Mode"); |
|
|
|
bl = sprintf(b, "SCSI Device Bus Location:" |
|
" Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n", |
|
pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id, |
|
host_id); |
|
|
|
if (sd) { |
|
bl += sprintf(b + bl, " Vendor: %." |
|
__stringify(INQUIRY_VENDOR_LEN) "s", sd->vendor); |
|
bl += sprintf(b + bl, " Model: %." |
|
__stringify(INQUIRY_MODEL_LEN) "s", sd->model); |
|
bl += sprintf(b + bl, " Rev: %." |
|
__stringify(INQUIRY_REVISION_LEN) "s\n", sd->rev); |
|
} |
|
return bl; |
|
} |
|
|
|
static void pscsi_bi_endio(struct bio *bio) |
|
{ |
|
bio_put(bio); |
|
} |
|
|
|
static inline struct bio *pscsi_get_bio(int nr_vecs) |
|
{ |
|
struct bio *bio; |
|
/* |
|
* Use bio_malloc() following the comment in for bio -> struct request |
|
* in block/blk-core.c:blk_make_request() |
|
*/ |
|
bio = bio_kmalloc(GFP_KERNEL, nr_vecs); |
|
if (!bio) { |
|
pr_err("PSCSI: bio_kmalloc() failed\n"); |
|
return NULL; |
|
} |
|
bio->bi_end_io = pscsi_bi_endio; |
|
|
|
return bio; |
|
} |
|
|
|
static sense_reason_t |
|
pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
|
struct request *req) |
|
{ |
|
struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); |
|
struct bio *bio = NULL; |
|
struct page *page; |
|
struct scatterlist *sg; |
|
u32 data_len = cmd->data_length, i, len, bytes, off; |
|
int nr_pages = (cmd->data_length + sgl[0].offset + |
|
PAGE_SIZE - 1) >> PAGE_SHIFT; |
|
int nr_vecs = 0, rc; |
|
int rw = (cmd->data_direction == DMA_TO_DEVICE); |
|
|
|
BUG_ON(!cmd->data_length); |
|
|
|
pr_debug("PSCSI: nr_pages: %d\n", nr_pages); |
|
|
|
for_each_sg(sgl, sg, sgl_nents, i) { |
|
page = sg_page(sg); |
|
off = sg->offset; |
|
len = sg->length; |
|
|
|
pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i, |
|
page, len, off); |
|
|
|
/* |
|
* We only have one page of data in each sg element, |
|
* we can not cross a page boundary. |
|
*/ |
|
if (off + len > PAGE_SIZE) |
|
goto fail; |
|
|
|
if (len > 0 && data_len > 0) { |
|
bytes = min_t(unsigned int, len, PAGE_SIZE - off); |
|
bytes = min(bytes, data_len); |
|
|
|
if (!bio) { |
|
new_bio: |
|
nr_vecs = bio_max_segs(nr_pages); |
|
/* |
|
* Calls bio_kmalloc() and sets bio->bi_end_io() |
|
*/ |
|
bio = pscsi_get_bio(nr_vecs); |
|
if (!bio) |
|
goto fail; |
|
|
|
if (rw) |
|
bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
|
|
|
pr_debug("PSCSI: Allocated bio: %p," |
|
" dir: %s nr_vecs: %d\n", bio, |
|
(rw) ? "rw" : "r", nr_vecs); |
|
} |
|
|
|
pr_debug("PSCSI: Calling bio_add_pc_page() i: %d" |
|
" bio: %p page: %p len: %d off: %d\n", i, bio, |
|
page, len, off); |
|
|
|
rc = bio_add_pc_page(pdv->pdv_sd->request_queue, |
|
bio, page, bytes, off); |
|
pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n", |
|
bio_segments(bio), nr_vecs); |
|
if (rc != bytes) { |
|
pr_debug("PSCSI: Reached bio->bi_vcnt max:" |
|
" %d i: %d bio: %p, allocating another" |
|
" bio\n", bio->bi_vcnt, i, bio); |
|
|
|
rc = blk_rq_append_bio(req, bio); |
|
if (rc) { |
|
pr_err("pSCSI: failed to append bio\n"); |
|
goto fail; |
|
} |
|
|
|
/* |
|
* Clear the pointer so that another bio will |
|
* be allocated with pscsi_get_bio() above. |
|
*/ |
|
bio = NULL; |
|
goto new_bio; |
|
} |
|
|
|
data_len -= bytes; |
|
} |
|
} |
|
|
|
if (bio) { |
|
rc = blk_rq_append_bio(req, bio); |
|
if (rc) { |
|
pr_err("pSCSI: failed to append bio\n"); |
|
goto fail; |
|
} |
|
} |
|
|
|
return 0; |
|
fail: |
|
if (bio) |
|
bio_put(bio); |
|
while (req->bio) { |
|
bio = req->bio; |
|
req->bio = bio->bi_next; |
|
bio_put(bio); |
|
} |
|
req->biotail = NULL; |
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
|
} |
|
|
|
static sense_reason_t |
|
pscsi_parse_cdb(struct se_cmd *cmd) |
|
{ |
|
if (cmd->se_cmd_flags & SCF_BIDI) |
|
return TCM_UNSUPPORTED_SCSI_OPCODE; |
|
|
|
return passthrough_parse_cdb(cmd, pscsi_execute_cmd); |
|
} |
|
|
|
static sense_reason_t |
|
pscsi_execute_cmd(struct se_cmd *cmd) |
|
{ |
|
struct scatterlist *sgl = cmd->t_data_sg; |
|
u32 sgl_nents = cmd->t_data_nents; |
|
struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); |
|
struct pscsi_plugin_task *pt; |
|
struct request *req; |
|
sense_reason_t ret; |
|
|
|
/* |
|
* Dynamically alloc cdb space, since it may be larger than |
|
* TCM_MAX_COMMAND_SIZE |
|
*/ |
|
pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL); |
|
if (!pt) { |
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
|
} |
|
cmd->priv = pt; |
|
|
|
memcpy(pt->pscsi_cdb, cmd->t_task_cdb, |
|
scsi_command_size(cmd->t_task_cdb)); |
|
|
|
req = blk_get_request(pdv->pdv_sd->request_queue, |
|
cmd->data_direction == DMA_TO_DEVICE ? |
|
REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); |
|
if (IS_ERR(req)) { |
|
pr_err("PSCSI: blk_get_request() failed\n"); |
|
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
|
goto fail; |
|
} |
|
|
|
if (sgl) { |
|
ret = pscsi_map_sg(cmd, sgl, sgl_nents, req); |
|
if (ret) |
|
goto fail_put_request; |
|
} |
|
|
|
req->end_io = pscsi_req_done; |
|
req->end_io_data = cmd; |
|
scsi_req(req)->cmd_len = scsi_command_size(pt->pscsi_cdb); |
|
scsi_req(req)->cmd = &pt->pscsi_cdb[0]; |
|
if (pdv->pdv_sd->type == TYPE_DISK || |
|
pdv->pdv_sd->type == TYPE_ZBC) |
|
req->timeout = PS_TIMEOUT_DISK; |
|
else |
|
req->timeout = PS_TIMEOUT_OTHER; |
|
scsi_req(req)->retries = PS_RETRY; |
|
|
|
blk_execute_rq_nowait(NULL, req, (cmd->sam_task_attr == TCM_HEAD_TAG), |
|
pscsi_req_done); |
|
|
|
return 0; |
|
|
|
fail_put_request: |
|
blk_put_request(req); |
|
fail: |
|
kfree(pt); |
|
return ret; |
|
} |
|
|
|
/* pscsi_get_device_type(): |
|
* |
|
* |
|
*/ |
|
static u32 pscsi_get_device_type(struct se_device *dev) |
|
{ |
|
struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); |
|
struct scsi_device *sd = pdv->pdv_sd; |
|
|
|
return (sd) ? sd->type : TYPE_NO_LUN; |
|
} |
|
|
|
static sector_t pscsi_get_blocks(struct se_device *dev) |
|
{ |
|
struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); |
|
|
|
if (pdv->pdv_bd) |
|
return bdev_nr_sectors(pdv->pdv_bd); |
|
return 0; |
|
} |
|
|
|
static void pscsi_req_done(struct request *req, blk_status_t status) |
|
{ |
|
struct se_cmd *cmd = req->end_io_data; |
|
struct pscsi_plugin_task *pt = cmd->priv; |
|
int result = scsi_req(req)->result; |
|
enum sam_status scsi_status = result & 0xff; |
|
|
|
if (scsi_status != SAM_STAT_GOOD) { |
|
pr_debug("PSCSI Status Byte exception at cmd: %p CDB:" |
|
" 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0], |
|
result); |
|
} |
|
|
|
pscsi_complete_cmd(cmd, scsi_status, scsi_req(req)->sense); |
|
|
|
switch (host_byte(result)) { |
|
case DID_OK: |
|
target_complete_cmd_with_length(cmd, scsi_status, |
|
cmd->data_length - scsi_req(req)->resid_len); |
|
break; |
|
default: |
|
pr_debug("PSCSI Host Byte exception at cmd: %p CDB:" |
|
" 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0], |
|
result); |
|
target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
|
break; |
|
} |
|
|
|
blk_put_request(req); |
|
kfree(pt); |
|
} |
|
|
|
static const struct target_backend_ops pscsi_ops = { |
|
.name = "pscsi", |
|
.owner = THIS_MODULE, |
|
.transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH | |
|
TRANSPORT_FLAG_PASSTHROUGH_ALUA | |
|
TRANSPORT_FLAG_PASSTHROUGH_PGR, |
|
.attach_hba = pscsi_attach_hba, |
|
.detach_hba = pscsi_detach_hba, |
|
.pmode_enable_hba = pscsi_pmode_enable_hba, |
|
.alloc_device = pscsi_alloc_device, |
|
.configure_device = pscsi_configure_device, |
|
.destroy_device = pscsi_destroy_device, |
|
.free_device = pscsi_free_device, |
|
.parse_cdb = pscsi_parse_cdb, |
|
.set_configfs_dev_params = pscsi_set_configfs_dev_params, |
|
.show_configfs_dev_params = pscsi_show_configfs_dev_params, |
|
.get_device_type = pscsi_get_device_type, |
|
.get_blocks = pscsi_get_blocks, |
|
.tb_dev_attrib_attrs = passthrough_attrib_attrs, |
|
}; |
|
|
|
static int __init pscsi_module_init(void) |
|
{ |
|
return transport_backend_register(&pscsi_ops); |
|
} |
|
|
|
static void __exit pscsi_module_exit(void) |
|
{ |
|
target_backend_unregister(&pscsi_ops); |
|
} |
|
|
|
MODULE_DESCRIPTION("TCM PSCSI subsystem plugin"); |
|
MODULE_AUTHOR("[email protected]"); |
|
MODULE_LICENSE("GPL"); |
|
|
|
module_init(pscsi_module_init); |
|
module_exit(pscsi_module_exit);
|
|
|