| /* |
| * Xen SCSI backend driver |
| * |
| * Copyright (c) 2008, FUJITSU Limited |
| * |
| * Based on the blkback driver code. |
| * Adaption to kernel taget core infrastructure taken from vhost/scsi.c |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License version 2 |
| * as published by the Free Software Foundation; or, when distributed |
| * separately from the Linux kernel or incorporated into other |
| * software packages, subject to the following license: |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this source file (the "Software"), to deal in the Software without |
| * restriction, including without limitation the rights to use, copy, modify, |
| * merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| * and to permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| */ |
| |
| #include <stdarg.h> |
| |
| #include <linux/module.h> |
| #include <linux/utsname.h> |
| #include <linux/interrupt.h> |
| #include <linux/slab.h> |
| #include <linux/wait.h> |
| #include <linux/sched.h> |
| #include <linux/list.h> |
| #include <linux/gfp.h> |
| #include <linux/delay.h> |
| #include <linux/spinlock.h> |
| #include <linux/configfs.h> |
| |
| #include <generated/utsrelease.h> |
| |
| #include <scsi/scsi_dbg.h> |
| #include <scsi/scsi_eh.h> |
| #include <scsi/scsi_tcq.h> |
| |
| #include <target/target_core_base.h> |
| #include <target/target_core_fabric.h> |
| #include <target/target_core_configfs.h> |
| #include <target/target_core_fabric_configfs.h> |
| |
| #include <asm/hypervisor.h> |
| |
| #include <xen/xen.h> |
| #include <xen/balloon.h> |
| #include <xen/events.h> |
| #include <xen/xenbus.h> |
| #include <xen/grant_table.h> |
| #include <xen/page.h> |
| |
| #include <xen/interface/grant_table.h> |
| #include <xen/interface/io/vscsiif.h> |
| |
| #define DPRINTK(_f, _a...) \ |
| pr_debug("(file=%s, line=%d) " _f, __FILE__ , __LINE__ , ## _a) |
| |
| #define VSCSI_VERSION "v0.1" |
| #define VSCSI_NAMELEN 32 |
| |
| struct ids_tuple { |
| unsigned int hst; /* host */ |
| unsigned int chn; /* channel */ |
| unsigned int tgt; /* target */ |
| unsigned int lun; /* LUN */ |
| }; |
| |
| struct v2p_entry { |
| struct ids_tuple v; /* translate from */ |
| struct scsiback_tpg *tpg; /* translate to */ |
| unsigned int lun; |
| struct kref kref; |
| struct list_head l; |
| }; |
| |
| struct vscsibk_info { |
| struct xenbus_device *dev; |
| |
| domid_t domid; |
| unsigned int irq; |
| |
| struct vscsiif_back_ring ring; |
| int ring_error; |
| |
| spinlock_t ring_lock; |
| atomic_t nr_unreplied_reqs; |
| |
| spinlock_t v2p_lock; |
| struct list_head v2p_entry_lists; |
| |
| wait_queue_head_t waiting_to_free; |
| }; |
| |
| /* theoretical maximum of grants for one request */ |
| #define VSCSI_MAX_GRANTS (SG_ALL + VSCSIIF_SG_TABLESIZE) |
| |
| /* |
| * VSCSI_GRANT_BATCH is the maximum number of grants to be processed in one |
| * call to map/unmap grants. Don't choose it too large, as there are arrays |
| * with VSCSI_GRANT_BATCH elements allocated on the stack. |
| */ |
| #define VSCSI_GRANT_BATCH 16 |
| |
| struct vscsibk_pend { |
| uint16_t rqid; |
| |
| uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE]; |
| uint8_t cmd_len; |
| |
| uint8_t sc_data_direction; |
| uint16_t n_sg; /* real length of SG list */ |
| uint16_t n_grants; /* SG pages and potentially SG list */ |
| uint32_t data_len; |
| uint32_t result; |
| |
| struct vscsibk_info *info; |
| struct v2p_entry *v2p; |
| struct scatterlist *sgl; |
| |
| uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE]; |
| |
| grant_handle_t grant_handles[VSCSI_MAX_GRANTS]; |
| struct page *pages[VSCSI_MAX_GRANTS]; |
| |
| struct se_cmd se_cmd; |
| }; |
| |
| struct scsiback_tmr { |
| atomic_t tmr_complete; |
| wait_queue_head_t tmr_wait; |
| }; |
| |
| struct scsiback_nexus { |
| /* Pointer to TCM session for I_T Nexus */ |
| struct se_session *tvn_se_sess; |
| }; |
| |
| struct scsiback_tport { |
| /* SCSI protocol the tport is providing */ |
| u8 tport_proto_id; |
| /* Binary World Wide unique Port Name for pvscsi Target port */ |
| u64 tport_wwpn; |
| /* ASCII formatted WWPN for pvscsi Target port */ |
| char tport_name[VSCSI_NAMELEN]; |
| /* Returned by scsiback_make_tport() */ |
| struct se_wwn tport_wwn; |
| }; |
| |
| struct scsiback_tpg { |
| /* scsiback port target portal group tag for TCM */ |
| u16 tport_tpgt; |
| /* track number of TPG Port/Lun Links wrt explicit I_T Nexus shutdown */ |
| int tv_tpg_port_count; |
| /* xen-pvscsi references to tpg_nexus, protected by tv_tpg_mutex */ |
| int tv_tpg_fe_count; |
| /* list for scsiback_list */ |
| struct list_head tv_tpg_list; |
| /* Used to protect access for tpg_nexus */ |
| struct mutex tv_tpg_mutex; |
| /* Pointer to the TCM pvscsi I_T Nexus for this TPG endpoint */ |
| struct scsiback_nexus *tpg_nexus; |
| /* Pointer back to scsiback_tport */ |
| struct scsiback_tport *tport; |
| /* Returned by scsiback_make_tpg() */ |
| struct se_portal_group se_tpg; |
| /* alias used in xenstore */ |
| char param_alias[VSCSI_NAMELEN]; |
| /* list of info structures related to this target portal group */ |
| struct list_head info_list; |
| }; |
| |
| #define SCSIBACK_INVALID_HANDLE (~0) |
| |
| static bool log_print_stat; |
| module_param(log_print_stat, bool, 0644); |
| |
| static int scsiback_max_buffer_pages = 1024; |
| module_param_named(max_buffer_pages, scsiback_max_buffer_pages, int, 0644); |
| MODULE_PARM_DESC(max_buffer_pages, |
| "Maximum number of free pages to keep in backend buffer"); |
| |
| static struct kmem_cache *scsiback_cachep; |
| static DEFINE_SPINLOCK(free_pages_lock); |
| static int free_pages_num; |
| static LIST_HEAD(scsiback_free_pages); |
| |
| /* Global spinlock to protect scsiback TPG list */ |
| static DEFINE_MUTEX(scsiback_mutex); |
| static LIST_HEAD(scsiback_list); |
| |
| /* Local pointer to allocated TCM configfs fabric module */ |
| static struct target_fabric_configfs *scsiback_fabric_configfs; |
| |
| static void scsiback_get(struct vscsibk_info *info) |
| { |
| atomic_inc(&info->nr_unreplied_reqs); |
| } |
| |
| static void scsiback_put(struct vscsibk_info *info) |
| { |
| if (atomic_dec_and_test(&info->nr_unreplied_reqs)) |
| wake_up(&info->waiting_to_free); |
| } |
| |
| static void put_free_pages(struct page **page, int num) |
| { |
| unsigned long flags; |
| int i = free_pages_num + num, n = num; |
| |
| if (num == 0) |
| return; |
| if (i > scsiback_max_buffer_pages) { |
| n = min(num, i - scsiback_max_buffer_pages); |
| gnttab_free_pages(n, page + num - n); |
| n = num - n; |
| } |
| spin_lock_irqsave(&free_pages_lock, flags); |
| for (i = 0; i < n; i++) |
| list_add(&page[i]->lru, &scsiback_free_pages); |
| free_pages_num += n; |
| spin_unlock_irqrestore(&free_pages_lock, flags); |
| } |
| |
| static int get_free_page(struct page **page) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&free_pages_lock, flags); |
| if (list_empty(&scsiback_free_pages)) { |
| spin_unlock_irqrestore(&free_pages_lock, flags); |
| return gnttab_alloc_pages(1, page); |
| } |
| page[0] = list_first_entry(&scsiback_free_pages, struct page, lru); |
| list_del(&page[0]->lru); |
| free_pages_num--; |
| spin_unlock_irqrestore(&free_pages_lock, flags); |
| return 0; |
| } |
| |
| static unsigned long vaddr_page(struct page *page) |
| { |
| unsigned long pfn = page_to_pfn(page); |
| |
| return (unsigned long)pfn_to_kaddr(pfn); |
| } |
| |
| static unsigned long vaddr(struct vscsibk_pend *req, int seg) |
| { |
| return vaddr_page(req->pages[seg]); |
| } |
| |
| static void scsiback_print_status(char *sense_buffer, int errors, |
| struct vscsibk_pend *pending_req) |
| { |
| struct scsiback_tpg *tpg = pending_req->v2p->tpg; |
| |
| pr_err("xen-pvscsi[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n", |
| tpg->tport->tport_name, pending_req->v2p->lun, |
| pending_req->cmnd[0], status_byte(errors), msg_byte(errors), |
| host_byte(errors), driver_byte(errors)); |
| } |
| |
| static void scsiback_fast_flush_area(struct vscsibk_pend *req) |
| { |
| struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH]; |
| struct page *pages[VSCSI_GRANT_BATCH]; |
| unsigned int i, invcount = 0; |
| grant_handle_t handle; |
| int err; |
| |
| kfree(req->sgl); |
| req->sgl = NULL; |
| req->n_sg = 0; |
| |
| if (!req->n_grants) |
| return; |
| |
| for (i = 0; i < req->n_grants; i++) { |
| handle = req->grant_handles[i]; |
| if (handle == SCSIBACK_INVALID_HANDLE) |
| continue; |
| gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i), |
| GNTMAP_host_map, handle); |
| req->grant_handles[i] = SCSIBACK_INVALID_HANDLE; |
| pages[invcount] = req->pages[i]; |
| put_page(pages[invcount]); |
| invcount++; |
| if (invcount < VSCSI_GRANT_BATCH) |
| continue; |
| err = gnttab_unmap_refs(unmap, NULL, pages, invcount); |
| BUG_ON(err); |
| invcount = 0; |
| } |
| |
| if (invcount) { |
| err = gnttab_unmap_refs(unmap, NULL, pages, invcount); |
| BUG_ON(err); |
| } |
| |
| put_free_pages(req->pages, req->n_grants); |
| req->n_grants = 0; |
| } |
| |
| static void scsiback_free_translation_entry(struct kref *kref) |
| { |
| struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref); |
| struct scsiback_tpg *tpg = entry->tpg; |
| |
| mutex_lock(&tpg->tv_tpg_mutex); |
| tpg->tv_tpg_fe_count--; |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| |
| kfree(entry); |
| } |
| |
| static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result, |
| uint32_t resid, struct vscsibk_pend *pending_req) |
| { |
| struct vscsiif_response *ring_res; |
| struct vscsibk_info *info = pending_req->info; |
| int notify; |
| struct scsi_sense_hdr sshdr; |
| unsigned long flags; |
| unsigned len; |
| |
| spin_lock_irqsave(&info->ring_lock, flags); |
| |
| ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt); |
| info->ring.rsp_prod_pvt++; |
| |
| ring_res->rslt = result; |
| ring_res->rqid = pending_req->rqid; |
| |
| if (sense_buffer != NULL && |
| scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE, |
| &sshdr)) { |
| len = min_t(unsigned, 8 + sense_buffer[7], |
| VSCSIIF_SENSE_BUFFERSIZE); |
| memcpy(ring_res->sense_buffer, sense_buffer, len); |
| ring_res->sense_len = len; |
| } else { |
| ring_res->sense_len = 0; |
| } |
| |
| ring_res->residual_len = resid; |
| |
| RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify); |
| spin_unlock_irqrestore(&info->ring_lock, flags); |
| |
| if (notify) |
| notify_remote_via_irq(info->irq); |
| |
| if (pending_req->v2p) |
| kref_put(&pending_req->v2p->kref, |
| scsiback_free_translation_entry); |
| } |
| |
| static void scsiback_cmd_done(struct vscsibk_pend *pending_req) |
| { |
| struct vscsibk_info *info = pending_req->info; |
| unsigned char *sense_buffer; |
| unsigned int resid; |
| int errors; |
| |
| sense_buffer = pending_req->sense_buffer; |
| resid = pending_req->se_cmd.residual_count; |
| errors = pending_req->result; |
| |
| if (errors && log_print_stat) |
| scsiback_print_status(sense_buffer, errors, pending_req); |
| |
| scsiback_fast_flush_area(pending_req); |
| scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req); |
| scsiback_put(info); |
| } |
| |
| static void scsiback_cmd_exec(struct vscsibk_pend *pending_req) |
| { |
| struct se_cmd *se_cmd = &pending_req->se_cmd; |
| struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess; |
| int rc; |
| |
| memset(pending_req->sense_buffer, 0, VSCSIIF_SENSE_BUFFERSIZE); |
| |
| memset(se_cmd, 0, sizeof(*se_cmd)); |
| |
| scsiback_get(pending_req->info); |
| rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd, |
| pending_req->sense_buffer, pending_req->v2p->lun, |
| pending_req->data_len, 0, |
| pending_req->sc_data_direction, 0, |
| pending_req->sgl, pending_req->n_sg, |
| NULL, 0, NULL, 0); |
| if (rc < 0) { |
| transport_send_check_condition_and_sense(se_cmd, |
| TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
| transport_generic_free_cmd(se_cmd, 0); |
| } |
| } |
| |
| static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map, |
| struct page **pg, grant_handle_t *grant, int cnt) |
| { |
| int err, i; |
| |
| if (!cnt) |
| return 0; |
| |
| err = gnttab_map_refs(map, NULL, pg, cnt); |
| BUG_ON(err); |
| for (i = 0; i < cnt; i++) { |
| if (unlikely(map[i].status != GNTST_okay)) { |
| pr_err("xen-pvscsi: invalid buffer -- could not remap it\n"); |
| map[i].handle = SCSIBACK_INVALID_HANDLE; |
| err = -ENOMEM; |
| } else { |
| get_page(pg[i]); |
| } |
| grant[i] = map[i].handle; |
| } |
| return err; |
| } |
| |
| static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req, |
| struct scsiif_request_segment *seg, struct page **pg, |
| grant_handle_t *grant, int cnt, u32 flags) |
| { |
| int mapcount = 0, i, err = 0; |
| struct gnttab_map_grant_ref map[VSCSI_GRANT_BATCH]; |
| struct vscsibk_info *info = pending_req->info; |
| |
| for (i = 0; i < cnt; i++) { |
| if (get_free_page(pg + mapcount)) { |
| put_free_pages(pg, mapcount); |
| pr_err("xen-pvscsi: no grant page\n"); |
| return -ENOMEM; |
| } |
| gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]), |
| flags, seg[i].gref, info->domid); |
| mapcount++; |
| if (mapcount < VSCSI_GRANT_BATCH) |
| continue; |
| err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); |
| pg += mapcount; |
| grant += mapcount; |
| pending_req->n_grants += mapcount; |
| if (err) |
| return err; |
| mapcount = 0; |
| } |
| err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); |
| pending_req->n_grants += mapcount; |
| return err; |
| } |
| |
| static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req, |
| struct vscsibk_pend *pending_req) |
| { |
| u32 flags; |
| int i, err, n_segs, i_seg = 0; |
| struct page **pg; |
| struct scsiif_request_segment *seg; |
| unsigned long end_seg = 0; |
| unsigned int nr_segments = (unsigned int)ring_req->nr_segments; |
| unsigned int nr_sgl = 0; |
| struct scatterlist *sg; |
| grant_handle_t *grant; |
| |
| pending_req->n_sg = 0; |
| pending_req->n_grants = 0; |
| pending_req->data_len = 0; |
| |
| nr_segments &= ~VSCSIIF_SG_GRANT; |
| if (!nr_segments) |
| return 0; |
| |
| if (nr_segments > VSCSIIF_SG_TABLESIZE) { |
| DPRINTK("xen-pvscsi: invalid parameter nr_seg = %d\n", |
| ring_req->nr_segments); |
| return -EINVAL; |
| } |
| |
| if (ring_req->nr_segments & VSCSIIF_SG_GRANT) { |
| err = scsiback_gnttab_data_map_list(pending_req, ring_req->seg, |
| pending_req->pages, pending_req->grant_handles, |
| nr_segments, GNTMAP_host_map | GNTMAP_readonly); |
| if (err) |
| return err; |
| nr_sgl = nr_segments; |
| nr_segments = 0; |
| for (i = 0; i < nr_sgl; i++) { |
| n_segs = ring_req->seg[i].length / |
| sizeof(struct scsiif_request_segment); |
| if ((unsigned)ring_req->seg[i].offset + |
| (unsigned)ring_req->seg[i].length > PAGE_SIZE || |
| n_segs * sizeof(struct scsiif_request_segment) != |
| ring_req->seg[i].length) |
| return -EINVAL; |
| nr_segments += n_segs; |
| } |
| if (nr_segments > SG_ALL) { |
| DPRINTK("xen-pvscsi: invalid nr_seg = %d\n", |
| nr_segments); |
| return -EINVAL; |
| } |
| } |
| |
| /* free of (sgl) in fast_flush_area()*/ |
| pending_req->sgl = kmalloc_array(nr_segments, |
| sizeof(struct scatterlist), GFP_KERNEL); |
| if (!pending_req->sgl) |
| return -ENOMEM; |
| |
| sg_init_table(pending_req->sgl, nr_segments); |
| pending_req->n_sg = nr_segments; |
| |
| flags = GNTMAP_host_map; |
| if (pending_req->sc_data_direction == DMA_TO_DEVICE) |
| flags |= GNTMAP_readonly; |
| |
| pg = pending_req->pages + nr_sgl; |
| grant = pending_req->grant_handles + nr_sgl; |
| if (!nr_sgl) { |
| seg = ring_req->seg; |
| err = scsiback_gnttab_data_map_list(pending_req, seg, |
| pg, grant, nr_segments, flags); |
| if (err) |
| return err; |
| } else { |
| for (i = 0; i < nr_sgl; i++) { |
| seg = (struct scsiif_request_segment *)( |
| vaddr(pending_req, i) + ring_req->seg[i].offset); |
| n_segs = ring_req->seg[i].length / |
| sizeof(struct scsiif_request_segment); |
| err = scsiback_gnttab_data_map_list(pending_req, seg, |
| pg, grant, n_segs, flags); |
| if (err) |
| return err; |
| pg += n_segs; |
| grant += n_segs; |
| } |
| end_seg = vaddr(pending_req, 0) + ring_req->seg[0].offset; |
| seg = (struct scsiif_request_segment *)end_seg; |
| end_seg += ring_req->seg[0].length; |
| pg = pending_req->pages + nr_sgl; |
| } |
| |
| for_each_sg(pending_req->sgl, sg, nr_segments, i) { |
| sg_set_page(sg, pg[i], seg->length, seg->offset); |
| pending_req->data_len += seg->length; |
| seg++; |
| if (nr_sgl && (unsigned long)seg >= end_seg) { |
| i_seg++; |
| end_seg = vaddr(pending_req, i_seg) + |
| ring_req->seg[i_seg].offset; |
| seg = (struct scsiif_request_segment *)end_seg; |
| end_seg += ring_req->seg[i_seg].length; |
| } |
| if (sg->offset >= PAGE_SIZE || |
| sg->length > PAGE_SIZE || |
| sg->offset + sg->length > PAGE_SIZE) |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static void scsiback_disconnect(struct vscsibk_info *info) |
| { |
| wait_event(info->waiting_to_free, |
| atomic_read(&info->nr_unreplied_reqs) == 0); |
| |
| unbind_from_irqhandler(info->irq, info); |
| info->irq = 0; |
| xenbus_unmap_ring_vfree(info->dev, info->ring.sring); |
| } |
| |
| static void scsiback_device_action(struct vscsibk_pend *pending_req, |
| enum tcm_tmreq_table act, int tag) |
| { |
| int rc, err = FAILED; |
| struct scsiback_tpg *tpg = pending_req->v2p->tpg; |
| struct se_cmd *se_cmd = &pending_req->se_cmd; |
| struct scsiback_tmr *tmr; |
| |
| tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL); |
| if (!tmr) |
| goto out; |
| |
| init_waitqueue_head(&tmr->tmr_wait); |
| |
| transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo, |
| tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, TCM_SIMPLE_TAG, |
| &pending_req->sense_buffer[0]); |
| |
| rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL); |
| if (rc < 0) |
| goto out; |
| |
| se_cmd->se_tmr_req->ref_task_tag = tag; |
| |
| if (transport_lookup_tmr_lun(se_cmd, pending_req->v2p->lun) < 0) |
| goto out; |
| |
| transport_generic_handle_tmr(se_cmd); |
| wait_event(tmr->tmr_wait, atomic_read(&tmr->tmr_complete)); |
| |
| err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? |
| SUCCESS : FAILED; |
| |
| out: |
| if (tmr) { |
| transport_generic_free_cmd(&pending_req->se_cmd, 1); |
| kfree(tmr); |
| } |
| |
| scsiback_do_resp_with_sense(NULL, err, 0, pending_req); |
| |
| kmem_cache_free(scsiback_cachep, pending_req); |
| } |
| |
| /* |
| Perform virtual to physical translation |
| */ |
| static struct v2p_entry *scsiback_do_translation(struct vscsibk_info *info, |
| struct ids_tuple *v) |
| { |
| struct v2p_entry *entry; |
| struct list_head *head = &(info->v2p_entry_lists); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&info->v2p_lock, flags); |
| list_for_each_entry(entry, head, l) { |
| if ((entry->v.chn == v->chn) && |
| (entry->v.tgt == v->tgt) && |
| (entry->v.lun == v->lun)) { |
| kref_get(&entry->kref); |
| goto out; |
| } |
| } |
| entry = NULL; |
| |
| out: |
| spin_unlock_irqrestore(&info->v2p_lock, flags); |
| return entry; |
| } |
| |
| static int prepare_pending_reqs(struct vscsibk_info *info, |
| struct vscsiif_request *ring_req, |
| struct vscsibk_pend *pending_req) |
| { |
| struct v2p_entry *v2p; |
| struct ids_tuple vir; |
| |
| pending_req->rqid = ring_req->rqid; |
| pending_req->info = info; |
| |
| vir.chn = ring_req->channel; |
| vir.tgt = ring_req->id; |
| vir.lun = ring_req->lun; |
| |
| v2p = scsiback_do_translation(info, &vir); |
| if (!v2p) { |
| pending_req->v2p = NULL; |
| DPRINTK("xen-pvscsi: doesn't exist.\n"); |
| return -ENODEV; |
| } |
| pending_req->v2p = v2p; |
| |
| /* request range check from frontend */ |
| pending_req->sc_data_direction = ring_req->sc_data_direction; |
| if ((pending_req->sc_data_direction != DMA_BIDIRECTIONAL) && |
| (pending_req->sc_data_direction != DMA_TO_DEVICE) && |
| (pending_req->sc_data_direction != DMA_FROM_DEVICE) && |
| (pending_req->sc_data_direction != DMA_NONE)) { |
| DPRINTK("xen-pvscsi: invalid parameter data_dir = %d\n", |
| pending_req->sc_data_direction); |
| return -EINVAL; |
| } |
| |
| pending_req->cmd_len = ring_req->cmd_len; |
| if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) { |
| DPRINTK("xen-pvscsi: invalid parameter cmd_len = %d\n", |
| pending_req->cmd_len); |
| return -EINVAL; |
| } |
| memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len); |
| |
| return 0; |
| } |
| |
| static int scsiback_do_cmd_fn(struct vscsibk_info *info) |
| { |
| struct vscsiif_back_ring *ring = &info->ring; |
| struct vscsiif_request *ring_req; |
| struct vscsibk_pend *pending_req; |
| RING_IDX rc, rp; |
| int err, more_to_do; |
| uint32_t result; |
| uint8_t act; |
| |
| rc = ring->req_cons; |
| rp = ring->sring->req_prod; |
| rmb(); /* guest system is accessing ring, too */ |
| |
| if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) { |
| rc = ring->rsp_prod_pvt; |
| pr_warn("xen-pvscsi: Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n", |
| info->domid, rp, rc, rp - rc); |
| info->ring_error = 1; |
| return 0; |
| } |
| |
| while ((rc != rp)) { |
| if (RING_REQUEST_CONS_OVERFLOW(ring, rc)) |
| break; |
| pending_req = kmem_cache_alloc(scsiback_cachep, GFP_KERNEL); |
| if (!pending_req) |
| return 1; |
| |
| ring_req = RING_GET_REQUEST(ring, rc); |
| ring->req_cons = ++rc; |
| |
| act = ring_req->act; |
| err = prepare_pending_reqs(info, ring_req, pending_req); |
| if (err) { |
| switch (err) { |
| case -ENODEV: |
| result = DID_NO_CONNECT; |
| break; |
| default: |
| result = DRIVER_ERROR; |
| break; |
| } |
| scsiback_do_resp_with_sense(NULL, result << 24, 0, |
| pending_req); |
| kmem_cache_free(scsiback_cachep, pending_req); |
| return 1; |
| } |
| |
| switch (act) { |
| case VSCSIIF_ACT_SCSI_CDB: |
| if (scsiback_gnttab_data_map(ring_req, pending_req)) { |
| scsiback_fast_flush_area(pending_req); |
| scsiback_do_resp_with_sense(NULL, |
| DRIVER_ERROR << 24, 0, pending_req); |
| kmem_cache_free(scsiback_cachep, pending_req); |
| } else { |
| scsiback_cmd_exec(pending_req); |
| } |
| break; |
| case VSCSIIF_ACT_SCSI_ABORT: |
| scsiback_device_action(pending_req, TMR_ABORT_TASK, |
| ring_req->ref_rqid); |
| break; |
| case VSCSIIF_ACT_SCSI_RESET: |
| scsiback_device_action(pending_req, TMR_LUN_RESET, 0); |
| break; |
| default: |
| pr_err_ratelimited("xen-pvscsi: invalid request\n"); |
| scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24, |
| 0, pending_req); |
| kmem_cache_free(scsiback_cachep, pending_req); |
| break; |
| } |
| |
| /* Yield point for this unbounded loop. */ |
| cond_resched(); |
| } |
| |
| RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do); |
| return more_to_do; |
| } |
| |
| static irqreturn_t scsiback_irq_fn(int irq, void *dev_id) |
| { |
| struct vscsibk_info *info = dev_id; |
| |
| if (info->ring_error) |
| return IRQ_HANDLED; |
| |
| while (scsiback_do_cmd_fn(info)) |
| cond_resched(); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref, |
| evtchn_port_t evtchn) |
| { |
| void *area; |
| struct vscsiif_sring *sring; |
| int err; |
| |
| if (info->irq) |
| return -1; |
| |
| err = xenbus_map_ring_valloc(info->dev, ring_ref, &area); |
| if (err) |
| return err; |
| |
| sring = (struct vscsiif_sring *)area; |
| BACK_RING_INIT(&info->ring, sring, PAGE_SIZE); |
| |
| err = bind_interdomain_evtchn_to_irq(info->domid, evtchn); |
| if (err < 0) |
| goto unmap_page; |
| |
| info->irq = err; |
| |
| err = request_threaded_irq(info->irq, NULL, scsiback_irq_fn, |
| IRQF_ONESHOT, "vscsiif-backend", info); |
| if (err) |
| goto free_irq; |
| |
| return 0; |
| |
| free_irq: |
| unbind_from_irqhandler(info->irq, info); |
| info->irq = 0; |
| unmap_page: |
| xenbus_unmap_ring_vfree(info->dev, area); |
| |
| return err; |
| } |
| |
| static int scsiback_map(struct vscsibk_info *info) |
| { |
| struct xenbus_device *dev = info->dev; |
| unsigned int ring_ref, evtchn; |
| int err; |
| |
| err = xenbus_gather(XBT_NIL, dev->otherend, |
| "ring-ref", "%u", &ring_ref, |
| "event-channel", "%u", &evtchn, NULL); |
| if (err) { |
| xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend); |
| return err; |
| } |
| |
| return scsiback_init_sring(info, ring_ref, evtchn); |
| } |
| |
| /* |
| Add a new translation entry |
| */ |
| static int scsiback_add_translation_entry(struct vscsibk_info *info, |
| char *phy, struct ids_tuple *v) |
| { |
| int err = 0; |
| struct v2p_entry *entry; |
| struct v2p_entry *new; |
| struct list_head *head = &(info->v2p_entry_lists); |
| unsigned long flags; |
| char *lunp; |
| unsigned int lun; |
| struct scsiback_tpg *tpg_entry, *tpg = NULL; |
| char *error = "doesn't exist"; |
| |
| lunp = strrchr(phy, ':'); |
| if (!lunp) { |
| pr_err("xen-pvscsi: illegal format of physical device %s\n", |
| phy); |
| return -EINVAL; |
| } |
| *lunp = 0; |
| lunp++; |
| if (kstrtouint(lunp, 10, &lun) || lun >= TRANSPORT_MAX_LUNS_PER_TPG) { |
| pr_err("xen-pvscsi: lun number not valid: %s\n", lunp); |
| return -EINVAL; |
| } |
| |
| mutex_lock(&scsiback_mutex); |
| list_for_each_entry(tpg_entry, &scsiback_list, tv_tpg_list) { |
| if (!strcmp(phy, tpg_entry->tport->tport_name) || |
| !strcmp(phy, tpg_entry->param_alias)) { |
| spin_lock(&tpg_entry->se_tpg.tpg_lun_lock); |
| if (tpg_entry->se_tpg.tpg_lun_list[lun]->lun_status == |
| TRANSPORT_LUN_STATUS_ACTIVE) { |
| if (!tpg_entry->tpg_nexus) |
| error = "nexus undefined"; |
| else |
| tpg = tpg_entry; |
| } |
| spin_unlock(&tpg_entry->se_tpg.tpg_lun_lock); |
| break; |
| } |
| } |
| if (tpg) { |
| mutex_lock(&tpg->tv_tpg_mutex); |
| tpg->tv_tpg_fe_count++; |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| } |
| mutex_unlock(&scsiback_mutex); |
| |
| if (!tpg) { |
| pr_err("xen-pvscsi: %s:%d %s\n", phy, lun, error); |
| return -ENODEV; |
| } |
| |
| new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL); |
| if (new == NULL) { |
| err = -ENOMEM; |
| goto out_free; |
| } |
| |
| spin_lock_irqsave(&info->v2p_lock, flags); |
| |
| /* Check double assignment to identical virtual ID */ |
| list_for_each_entry(entry, head, l) { |
| if ((entry->v.chn == v->chn) && |
| (entry->v.tgt == v->tgt) && |
| (entry->v.lun == v->lun)) { |
| pr_warn("xen-pvscsi: Virtual ID is already used. Assignment was not performed.\n"); |
| err = -EEXIST; |
| goto out; |
| } |
| |
| } |
| |
| /* Create a new translation entry and add to the list */ |
| kref_init(&new->kref); |
| new->v = *v; |
| new->tpg = tpg; |
| new->lun = lun; |
| list_add_tail(&new->l, head); |
| |
| out: |
| spin_unlock_irqrestore(&info->v2p_lock, flags); |
| |
| out_free: |
| mutex_lock(&tpg->tv_tpg_mutex); |
| tpg->tv_tpg_fe_count--; |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| |
| if (err) |
| kfree(new); |
| |
| return err; |
| } |
| |
| static void __scsiback_del_translation_entry(struct v2p_entry *entry) |
| { |
| list_del(&entry->l); |
| kref_put(&entry->kref, scsiback_free_translation_entry); |
| } |
| |
| /* |
| Delete the translation entry specfied |
| */ |
| static int scsiback_del_translation_entry(struct vscsibk_info *info, |
| struct ids_tuple *v) |
| { |
| struct v2p_entry *entry; |
| struct list_head *head = &(info->v2p_entry_lists); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&info->v2p_lock, flags); |
| /* Find out the translation entry specified */ |
| list_for_each_entry(entry, head, l) { |
| if ((entry->v.chn == v->chn) && |
| (entry->v.tgt == v->tgt) && |
| (entry->v.lun == v->lun)) { |
| goto found; |
| } |
| } |
| |
| spin_unlock_irqrestore(&info->v2p_lock, flags); |
| return 1; |
| |
| found: |
| /* Delete the translation entry specfied */ |
| __scsiback_del_translation_entry(entry); |
| |
| spin_unlock_irqrestore(&info->v2p_lock, flags); |
| return 0; |
| } |
| |
| static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state, |
| char *phy, struct ids_tuple *vir) |
| { |
| if (!scsiback_add_translation_entry(info, phy, vir)) { |
| if (xenbus_printf(XBT_NIL, info->dev->nodename, state, |
| "%d", XenbusStateInitialised)) { |
| pr_err("xen-pvscsi: xenbus_printf error %s\n", state); |
| scsiback_del_translation_entry(info, vir); |
| } |
| } else { |
| xenbus_printf(XBT_NIL, info->dev->nodename, state, |
| "%d", XenbusStateClosed); |
| } |
| } |
| |
| static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state, |
| struct ids_tuple *vir) |
| { |
| if (!scsiback_del_translation_entry(info, vir)) { |
| if (xenbus_printf(XBT_NIL, info->dev->nodename, state, |
| "%d", XenbusStateClosed)) |
| pr_err("xen-pvscsi: xenbus_printf error %s\n", state); |
| } |
| } |
| |
| #define VSCSIBACK_OP_ADD_OR_DEL_LUN 1 |
| #define VSCSIBACK_OP_UPDATEDEV_STATE 2 |
| |
| static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op, |
| char *ent) |
| { |
| int err; |
| struct ids_tuple vir; |
| char *val; |
| int device_state; |
| char phy[VSCSI_NAMELEN]; |
| char str[64]; |
| char state[64]; |
| struct xenbus_device *dev = info->dev; |
| |
| /* read status */ |
| snprintf(state, sizeof(state), "vscsi-devs/%s/state", ent); |
| err = xenbus_scanf(XBT_NIL, dev->nodename, state, "%u", &device_state); |
| if (XENBUS_EXIST_ERR(err)) |
| return; |
| |
| /* physical SCSI device */ |
| snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent); |
| val = xenbus_read(XBT_NIL, dev->nodename, str, NULL); |
| if (IS_ERR(val)) { |
| xenbus_printf(XBT_NIL, dev->nodename, state, |
| "%d", XenbusStateClosed); |
| return; |
| } |
| strlcpy(phy, val, VSCSI_NAMELEN); |
| kfree(val); |
| |
| /* virtual SCSI device */ |
| snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", ent); |
| err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u", |
| &vir.hst, &vir.chn, &vir.tgt, &vir.lun); |
| if (XENBUS_EXIST_ERR(err)) { |
| xenbus_printf(XBT_NIL, dev->nodename, state, |
| "%d", XenbusStateClosed); |
| return; |
| } |
| |
| switch (op) { |
| case VSCSIBACK_OP_ADD_OR_DEL_LUN: |
| if (device_state == XenbusStateInitialising) |
| scsiback_do_add_lun(info, state, phy, &vir); |
| if (device_state == XenbusStateClosing) |
| scsiback_do_del_lun(info, state, &vir); |
| break; |
| |
| case VSCSIBACK_OP_UPDATEDEV_STATE: |
| if (device_state == XenbusStateInitialised) { |
| /* modify vscsi-devs/dev-x/state */ |
| if (xenbus_printf(XBT_NIL, dev->nodename, state, |
| "%d", XenbusStateConnected)) { |
| pr_err("xen-pvscsi: xenbus_printf error %s\n", |
| str); |
| scsiback_del_translation_entry(info, &vir); |
| xenbus_printf(XBT_NIL, dev->nodename, state, |
| "%d", XenbusStateClosed); |
| } |
| } |
| break; |
| /*When it is necessary, processing is added here.*/ |
| default: |
| break; |
| } |
| } |
| |
| static void scsiback_do_lun_hotplug(struct vscsibk_info *info, int op) |
| { |
| int i; |
| char **dir; |
| unsigned int ndir = 0; |
| |
| dir = xenbus_directory(XBT_NIL, info->dev->nodename, "vscsi-devs", |
| &ndir); |
| if (IS_ERR(dir)) |
| return; |
| |
| for (i = 0; i < ndir; i++) |
| scsiback_do_1lun_hotplug(info, op, dir[i]); |
| |
| kfree(dir); |
| } |
| |
| static void scsiback_frontend_changed(struct xenbus_device *dev, |
| enum xenbus_state frontend_state) |
| { |
| struct vscsibk_info *info = dev_get_drvdata(&dev->dev); |
| |
| switch (frontend_state) { |
| case XenbusStateInitialising: |
| break; |
| |
| case XenbusStateInitialised: |
| if (scsiback_map(info)) |
| break; |
| |
| scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); |
| xenbus_switch_state(dev, XenbusStateConnected); |
| break; |
| |
| case XenbusStateConnected: |
| scsiback_do_lun_hotplug(info, VSCSIBACK_OP_UPDATEDEV_STATE); |
| |
| if (dev->state == XenbusStateConnected) |
| break; |
| |
| xenbus_switch_state(dev, XenbusStateConnected); |
| break; |
| |
| case XenbusStateClosing: |
| if (info->irq) |
| scsiback_disconnect(info); |
| |
| xenbus_switch_state(dev, XenbusStateClosing); |
| break; |
| |
| case XenbusStateClosed: |
| xenbus_switch_state(dev, XenbusStateClosed); |
| if (xenbus_dev_is_online(dev)) |
| break; |
| /* fall through if not online */ |
| case XenbusStateUnknown: |
| device_unregister(&dev->dev); |
| break; |
| |
| case XenbusStateReconfiguring: |
| scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); |
| xenbus_switch_state(dev, XenbusStateReconfigured); |
| |
| break; |
| |
| default: |
| xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", |
| frontend_state); |
| break; |
| } |
| } |
| |
| /* |
| Release the translation entry specfied |
| */ |
| static void scsiback_release_translation_entry(struct vscsibk_info *info) |
| { |
| struct v2p_entry *entry, *tmp; |
| struct list_head *head = &(info->v2p_entry_lists); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&info->v2p_lock, flags); |
| |
| list_for_each_entry_safe(entry, tmp, head, l) |
| __scsiback_del_translation_entry(entry); |
| |
| spin_unlock_irqrestore(&info->v2p_lock, flags); |
| } |
| |
| static int scsiback_remove(struct xenbus_device *dev) |
| { |
| struct vscsibk_info *info = dev_get_drvdata(&dev->dev); |
| |
| if (info->irq) |
| scsiback_disconnect(info); |
| |
| scsiback_release_translation_entry(info); |
| |
| dev_set_drvdata(&dev->dev, NULL); |
| |
| return 0; |
| } |
| |
| static int scsiback_probe(struct xenbus_device *dev, |
| const struct xenbus_device_id *id) |
| { |
| int err; |
| |
| struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info), |
| GFP_KERNEL); |
| |
| DPRINTK("%p %d\n", dev, dev->otherend_id); |
| |
| if (!info) { |
| xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure"); |
| return -ENOMEM; |
| } |
| info->dev = dev; |
| dev_set_drvdata(&dev->dev, info); |
| |
| info->domid = dev->otherend_id; |
| spin_lock_init(&info->ring_lock); |
| info->ring_error = 0; |
| atomic_set(&info->nr_unreplied_reqs, 0); |
| init_waitqueue_head(&info->waiting_to_free); |
| info->dev = dev; |
| info->irq = 0; |
| INIT_LIST_HEAD(&info->v2p_entry_lists); |
| spin_lock_init(&info->v2p_lock); |
| |
| err = xenbus_printf(XBT_NIL, dev->nodename, "feature-sg-grant", "%u", |
| SG_ALL); |
| if (err) |
| xenbus_dev_error(dev, err, "writing feature-sg-grant"); |
| |
| err = xenbus_switch_state(dev, XenbusStateInitWait); |
| if (err) |
| goto fail; |
| |
| return 0; |
| |
| fail: |
| pr_warn("xen-pvscsi: %s failed\n", __func__); |
| scsiback_remove(dev); |
| |
| return err; |
| } |
| |
| static char *scsiback_dump_proto_id(struct scsiback_tport *tport) |
| { |
| switch (tport->tport_proto_id) { |
| case SCSI_PROTOCOL_SAS: |
| return "SAS"; |
| case SCSI_PROTOCOL_FCP: |
| return "FCP"; |
| case SCSI_PROTOCOL_ISCSI: |
| return "iSCSI"; |
| default: |
| break; |
| } |
| |
| return "Unknown"; |
| } |
| |
| static u8 scsiback_get_fabric_proto_ident(struct se_portal_group *se_tpg) |
| { |
| struct scsiback_tpg *tpg = container_of(se_tpg, |
| struct scsiback_tpg, se_tpg); |
| struct scsiback_tport *tport = tpg->tport; |
| |
| switch (tport->tport_proto_id) { |
| case SCSI_PROTOCOL_SAS: |
| return sas_get_fabric_proto_ident(se_tpg); |
| case SCSI_PROTOCOL_FCP: |
| return fc_get_fabric_proto_ident(se_tpg); |
| case SCSI_PROTOCOL_ISCSI: |
| return iscsi_get_fabric_proto_ident(se_tpg); |
| default: |
| pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", |
| tport->tport_proto_id); |
| break; |
| } |
| |
| return sas_get_fabric_proto_ident(se_tpg); |
| } |
| |
| static char *scsiback_get_fabric_wwn(struct se_portal_group *se_tpg) |
| { |
| struct scsiback_tpg *tpg = container_of(se_tpg, |
| struct scsiback_tpg, se_tpg); |
| struct scsiback_tport *tport = tpg->tport; |
| |
| return &tport->tport_name[0]; |
| } |
| |
| static u16 scsiback_get_tag(struct se_portal_group *se_tpg) |
| { |
| struct scsiback_tpg *tpg = container_of(se_tpg, |
| struct scsiback_tpg, se_tpg); |
| return tpg->tport_tpgt; |
| } |
| |
| static u32 scsiback_get_default_depth(struct se_portal_group *se_tpg) |
| { |
| return 1; |
| } |
| |
| static u32 |
| scsiback_get_pr_transport_id(struct se_portal_group *se_tpg, |
| struct se_node_acl *se_nacl, |
| struct t10_pr_registration *pr_reg, |
| int *format_code, |
| unsigned char *buf) |
| { |
| struct scsiback_tpg *tpg = container_of(se_tpg, |
| struct scsiback_tpg, se_tpg); |
| struct scsiback_tport *tport = tpg->tport; |
| |
| switch (tport->tport_proto_id) { |
| case SCSI_PROTOCOL_SAS: |
| return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, |
| format_code, buf); |
| case SCSI_PROTOCOL_FCP: |
| return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, |
| format_code, buf); |
| case SCSI_PROTOCOL_ISCSI: |
| return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, |
| format_code, buf); |
| default: |
| pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", |
| tport->tport_proto_id); |
| break; |
| } |
| |
| return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, |
| format_code, buf); |
| } |
| |
| static u32 |
| scsiback_get_pr_transport_id_len(struct se_portal_group *se_tpg, |
| struct se_node_acl *se_nacl, |
| struct t10_pr_registration *pr_reg, |
| int *format_code) |
| { |
| struct scsiback_tpg *tpg = container_of(se_tpg, |
| struct scsiback_tpg, se_tpg); |
| struct scsiback_tport *tport = tpg->tport; |
| |
| switch (tport->tport_proto_id) { |
| case SCSI_PROTOCOL_SAS: |
| return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, |
| format_code); |
| case SCSI_PROTOCOL_FCP: |
| return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, |
| format_code); |
| case SCSI_PROTOCOL_ISCSI: |
| return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, |
| format_code); |
| default: |
| pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", |
| tport->tport_proto_id); |
| break; |
| } |
| |
| return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, |
| format_code); |
| } |
| |
| static char * |
| scsiback_parse_pr_out_transport_id(struct se_portal_group *se_tpg, |
| const char *buf, |
| u32 *out_tid_len, |
| char **port_nexus_ptr) |
| { |
| struct scsiback_tpg *tpg = container_of(se_tpg, |
| struct scsiback_tpg, se_tpg); |
| struct scsiback_tport *tport = tpg->tport; |
| |
| switch (tport->tport_proto_id) { |
| case SCSI_PROTOCOL_SAS: |
| return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, |
| port_nexus_ptr); |
| case SCSI_PROTOCOL_FCP: |
| return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, |
| port_nexus_ptr); |
| case SCSI_PROTOCOL_ISCSI: |
| return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, |
| port_nexus_ptr); |
| default: |
| pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", |
| tport->tport_proto_id); |
| break; |
| } |
| |
| return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, |
| port_nexus_ptr); |
| } |
| |
| static struct se_wwn * |
| scsiback_make_tport(struct target_fabric_configfs *tf, |
| struct config_group *group, |
| const char *name) |
| { |
| struct scsiback_tport *tport; |
| char *ptr; |
| u64 wwpn = 0; |
| int off = 0; |
| |
| tport = kzalloc(sizeof(struct scsiback_tport), GFP_KERNEL); |
| if (!tport) |
| return ERR_PTR(-ENOMEM); |
| |
| tport->tport_wwpn = wwpn; |
| /* |
| * Determine the emulated Protocol Identifier and Target Port Name |
| * based on the incoming configfs directory name. |
| */ |
| ptr = strstr(name, "naa."); |
| if (ptr) { |
| tport->tport_proto_id = SCSI_PROTOCOL_SAS; |
| goto check_len; |
| } |
| ptr = strstr(name, "fc."); |
| if (ptr) { |
| tport->tport_proto_id = SCSI_PROTOCOL_FCP; |
| off = 3; /* Skip over "fc." */ |
| goto check_len; |
| } |
| ptr = strstr(name, "iqn."); |
| if (ptr) { |
| tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; |
| goto check_len; |
| } |
| |
| pr_err("Unable to locate prefix for emulated Target Port: %s\n", name); |
| kfree(tport); |
| return ERR_PTR(-EINVAL); |
| |
| check_len: |
| if (strlen(name) >= VSCSI_NAMELEN) { |
| pr_err("Emulated %s Address: %s, exceeds max: %d\n", name, |
| scsiback_dump_proto_id(tport), VSCSI_NAMELEN); |
| kfree(tport); |
| return ERR_PTR(-EINVAL); |
| } |
| snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]); |
| |
| pr_debug("xen-pvscsi: Allocated emulated Target %s Address: %s\n", |
| scsiback_dump_proto_id(tport), name); |
| |
| return &tport->tport_wwn; |
| } |
| |
| static void scsiback_drop_tport(struct se_wwn *wwn) |
| { |
| struct scsiback_tport *tport = container_of(wwn, |
| struct scsiback_tport, tport_wwn); |
| |
| pr_debug("xen-pvscsi: Deallocating emulated Target %s Address: %s\n", |
| scsiback_dump_proto_id(tport), tport->tport_name); |
| |
| kfree(tport); |
| } |
| |
| static struct se_node_acl * |
| scsiback_alloc_fabric_acl(struct se_portal_group *se_tpg) |
| { |
| return kzalloc(sizeof(struct se_node_acl), GFP_KERNEL); |
| } |
| |
| static void |
| scsiback_release_fabric_acl(struct se_portal_group *se_tpg, |
| struct se_node_acl *se_nacl) |
| { |
| kfree(se_nacl); |
| } |
| |
| static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg) |
| { |
| return 1; |
| } |
| |
| static int scsiback_check_stop_free(struct se_cmd *se_cmd) |
| { |
| /* |
| * Do not release struct se_cmd's containing a valid TMR |
| * pointer. These will be released directly in scsiback_device_action() |
| * with transport_generic_free_cmd(). |
| */ |
| if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) |
| return 0; |
| |
| transport_generic_free_cmd(se_cmd, 0); |
| return 1; |
| } |
| |
| static void scsiback_release_cmd(struct se_cmd *se_cmd) |
| { |
| struct vscsibk_pend *pending_req = container_of(se_cmd, |
| struct vscsibk_pend, se_cmd); |
| |
| kmem_cache_free(scsiback_cachep, pending_req); |
| } |
| |
| static int scsiback_shutdown_session(struct se_session *se_sess) |
| { |
| return 0; |
| } |
| |
| static void scsiback_close_session(struct se_session *se_sess) |
| { |
| } |
| |
| static u32 scsiback_sess_get_index(struct se_session *se_sess) |
| { |
| return 0; |
| } |
| |
| static int scsiback_write_pending(struct se_cmd *se_cmd) |
| { |
| /* Go ahead and process the write immediately */ |
| target_execute_cmd(se_cmd); |
| |
| return 0; |
| } |
| |
| static int scsiback_write_pending_status(struct se_cmd *se_cmd) |
| { |
| return 0; |
| } |
| |
| static void scsiback_set_default_node_attrs(struct se_node_acl *nacl) |
| { |
| } |
| |
| static u32 scsiback_get_task_tag(struct se_cmd *se_cmd) |
| { |
| struct vscsibk_pend *pending_req = container_of(se_cmd, |
| struct vscsibk_pend, se_cmd); |
| |
| return pending_req->rqid; |
| } |
| |
| static int scsiback_get_cmd_state(struct se_cmd *se_cmd) |
| { |
| return 0; |
| } |
| |
| static int scsiback_queue_data_in(struct se_cmd *se_cmd) |
| { |
| struct vscsibk_pend *pending_req = container_of(se_cmd, |
| struct vscsibk_pend, se_cmd); |
| |
| pending_req->result = SAM_STAT_GOOD; |
| scsiback_cmd_done(pending_req); |
| return 0; |
| } |
| |
| static int scsiback_queue_status(struct se_cmd *se_cmd) |
| { |
| struct vscsibk_pend *pending_req = container_of(se_cmd, |
| struct vscsibk_pend, se_cmd); |
| |
| if (se_cmd->sense_buffer && |
| ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || |
| (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) |
| pending_req->result = (DRIVER_SENSE << 24) | |
| SAM_STAT_CHECK_CONDITION; |
| else |
| pending_req->result = se_cmd->scsi_status; |
| |
| scsiback_cmd_done(pending_req); |
| return 0; |
| } |
| |
| static void scsiback_queue_tm_rsp(struct se_cmd *se_cmd) |
| { |
| struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; |
| struct scsiback_tmr *tmr = se_tmr->fabric_tmr_ptr; |
| |
| atomic_set(&tmr->tmr_complete, 1); |
| wake_up(&tmr->tmr_wait); |
| } |
| |
| static void scsiback_aborted_task(struct se_cmd *se_cmd) |
| { |
| } |
| |
| static ssize_t scsiback_tpg_param_show_alias(struct se_portal_group *se_tpg, |
| char *page) |
| { |
| struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, |
| se_tpg); |
| ssize_t rb; |
| |
| mutex_lock(&tpg->tv_tpg_mutex); |
| rb = snprintf(page, PAGE_SIZE, "%s\n", tpg->param_alias); |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| |
| return rb; |
| } |
| |
| static ssize_t scsiback_tpg_param_store_alias(struct se_portal_group *se_tpg, |
| const char *page, size_t count) |
| { |
| struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, |
| se_tpg); |
| int len; |
| |
| if (strlen(page) >= VSCSI_NAMELEN) { |
| pr_err("param alias: %s, exceeds max: %d\n", page, |
| VSCSI_NAMELEN); |
| return -EINVAL; |
| } |
| |
| mutex_lock(&tpg->tv_tpg_mutex); |
| len = snprintf(tpg->param_alias, VSCSI_NAMELEN, "%s", page); |
| if (tpg->param_alias[len - 1] == '\n') |
| tpg->param_alias[len - 1] = '\0'; |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| |
| return count; |
| } |
| |
| TF_TPG_PARAM_ATTR(scsiback, alias, S_IRUGO | S_IWUSR); |
| |
| static struct configfs_attribute *scsiback_param_attrs[] = { |
| &scsiback_tpg_param_alias.attr, |
| NULL, |
| }; |
| |
| static int scsiback_make_nexus(struct scsiback_tpg *tpg, |
| const char *name) |
| { |
| struct se_portal_group *se_tpg; |
| struct se_session *se_sess; |
| struct scsiback_nexus *tv_nexus; |
| |
| mutex_lock(&tpg->tv_tpg_mutex); |
| if (tpg->tpg_nexus) { |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| pr_debug("tpg->tpg_nexus already exists\n"); |
| return -EEXIST; |
| } |
| se_tpg = &tpg->se_tpg; |
| |
| tv_nexus = kzalloc(sizeof(struct scsiback_nexus), GFP_KERNEL); |
| if (!tv_nexus) { |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| return -ENOMEM; |
| } |
| /* |
| * Initialize the struct se_session pointer |
| */ |
| tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL); |
| if (IS_ERR(tv_nexus->tvn_se_sess)) { |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| kfree(tv_nexus); |
| return -ENOMEM; |
| } |
| se_sess = tv_nexus->tvn_se_sess; |
| /* |
| * Since we are running in 'demo mode' this call with generate a |
| * struct se_node_acl for the scsiback struct se_portal_group with |
| * the SCSI Initiator port name of the passed configfs group 'name'. |
| */ |
| tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( |
| se_tpg, (unsigned char *)name); |
| if (!tv_nexus->tvn_se_sess->se_node_acl) { |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| pr_debug("core_tpg_check_initiator_node_acl() failed for %s\n", |
| name); |
| goto out; |
| } |
| /* |
| * Now register the TCM pvscsi virtual I_T Nexus as active with the |
| * call to __transport_register_session() |
| */ |
| __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, |
| tv_nexus->tvn_se_sess, tv_nexus); |
| tpg->tpg_nexus = tv_nexus; |
| |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| return 0; |
| |
| out: |
| transport_free_session(se_sess); |
| kfree(tv_nexus); |
| return -ENOMEM; |
| } |
| |
| static int scsiback_drop_nexus(struct scsiback_tpg *tpg) |
| { |
| struct se_session *se_sess; |
| struct scsiback_nexus *tv_nexus; |
| |
| mutex_lock(&tpg->tv_tpg_mutex); |
| tv_nexus = tpg->tpg_nexus; |
| if (!tv_nexus) { |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| return -ENODEV; |
| } |
| |
| se_sess = tv_nexus->tvn_se_sess; |
| if (!se_sess) { |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| return -ENODEV; |
| } |
| |
| if (tpg->tv_tpg_port_count != 0) { |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG port count: %d\n", |
| tpg->tv_tpg_port_count); |
| return -EBUSY; |
| } |
| |
| if (tpg->tv_tpg_fe_count != 0) { |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG frontend count: %d\n", |
| tpg->tv_tpg_fe_count); |
| return -EBUSY; |
| } |
| |
| pr_debug("xen-pvscsi: Removing I_T Nexus to emulated %s Initiator Port: %s\n", |
| scsiback_dump_proto_id(tpg->tport), |
| tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
| |
| /* |
| * Release the SCSI I_T Nexus to the emulated xen-pvscsi Target Port |
| */ |
| transport_deregister_session(tv_nexus->tvn_se_sess); |
| tpg->tpg_nexus = NULL; |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| |
| kfree(tv_nexus); |
| return 0; |
| } |
| |
| static ssize_t scsiback_tpg_show_nexus(struct se_portal_group *se_tpg, |
| char *page) |
| { |
| struct scsiback_tpg *tpg = container_of(se_tpg, |
| struct scsiback_tpg, se_tpg); |
| struct scsiback_nexus *tv_nexus; |
| ssize_t ret; |
| |
| mutex_lock(&tpg->tv_tpg_mutex); |
| tv_nexus = tpg->tpg_nexus; |
| if (!tv_nexus) { |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| return -ENODEV; |
| } |
| ret = snprintf(page, PAGE_SIZE, "%s\n", |
| tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| |
| return ret; |
| } |
| |
| static ssize_t scsiback_tpg_store_nexus(struct se_portal_group *se_tpg, |
| const char *page, |
| size_t count) |
| { |
| struct scsiback_tpg *tpg = container_of(se_tpg, |
| struct scsiback_tpg, se_tpg); |
| struct scsiback_tport *tport_wwn = tpg->tport; |
| unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr; |
| int ret; |
| /* |
| * Shutdown the active I_T nexus if 'NULL' is passed.. |
| */ |
| if (!strncmp(page, "NULL", 4)) { |
| ret = scsiback_drop_nexus(tpg); |
| return (!ret) ? count : ret; |
| } |
| /* |
| * Otherwise make sure the passed virtual Initiator port WWN matches |
| * the fabric protocol_id set in scsiback_make_tport(), and call |
| * scsiback_make_nexus(). |
| */ |
| if (strlen(page) >= VSCSI_NAMELEN) { |
| pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n", |
| page, VSCSI_NAMELEN); |
| return -EINVAL; |
| } |
| snprintf(&i_port[0], VSCSI_NAMELEN, "%s", page); |
| |
| ptr = strstr(i_port, "naa."); |
| if (ptr) { |
| if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { |
| pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n", |
| i_port, scsiback_dump_proto_id(tport_wwn)); |
| return -EINVAL; |
| } |
| port_ptr = &i_port[0]; |
| goto check_newline; |
| } |
| ptr = strstr(i_port, "fc."); |
| if (ptr) { |
| if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { |
| pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n", |
| i_port, scsiback_dump_proto_id(tport_wwn)); |
| return -EINVAL; |
| } |
| port_ptr = &i_port[3]; /* Skip over "fc." */ |
| goto check_newline; |
| } |
| ptr = strstr(i_port, "iqn."); |
| if (ptr) { |
| if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { |
| pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n", |
| i_port, scsiback_dump_proto_id(tport_wwn)); |
| return -EINVAL; |
| } |
| port_ptr = &i_port[0]; |
| goto check_newline; |
| } |
| pr_err("Unable to locate prefix for emulated Initiator Port: %s\n", |
| i_port); |
| return -EINVAL; |
| /* |
| * Clear any trailing newline for the NAA WWN |
| */ |
| check_newline: |
| if (i_port[strlen(i_port) - 1] == '\n') |
| i_port[strlen(i_port) - 1] = '\0'; |
| |
| ret = scsiback_make_nexus(tpg, port_ptr); |
| if (ret < 0) |
| return ret; |
| |
| return count; |
| } |
| |
| TF_TPG_BASE_ATTR(scsiback, nexus, S_IRUGO | S_IWUSR); |
| |
| static struct configfs_attribute *scsiback_tpg_attrs[] = { |
| &scsiback_tpg_nexus.attr, |
| NULL, |
| }; |
| |
| static ssize_t |
| scsiback_wwn_show_attr_version(struct target_fabric_configfs *tf, |
| char *page) |
| { |
| return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on " |
| UTS_RELEASE"\n", |
| VSCSI_VERSION, utsname()->sysname, utsname()->machine); |
| } |
| |
| TF_WWN_ATTR_RO(scsiback, version); |
| |
| static struct configfs_attribute *scsiback_wwn_attrs[] = { |
| &scsiback_wwn_version.attr, |
| NULL, |
| }; |
| |
| static char *scsiback_get_fabric_name(void) |
| { |
| return "xen-pvscsi"; |
| } |
| |
| static int scsiback_port_link(struct se_portal_group *se_tpg, |
| struct se_lun *lun) |
| { |
| struct scsiback_tpg *tpg = container_of(se_tpg, |
| struct scsiback_tpg, se_tpg); |
| |
| mutex_lock(&tpg->tv_tpg_mutex); |
| tpg->tv_tpg_port_count++; |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| |
| return 0; |
| } |
| |
| static void scsiback_port_unlink(struct se_portal_group *se_tpg, |
| struct se_lun *lun) |
| { |
| struct scsiback_tpg *tpg = container_of(se_tpg, |
| struct scsiback_tpg, se_tpg); |
| |
| mutex_lock(&tpg->tv_tpg_mutex); |
| tpg->tv_tpg_port_count--; |
| mutex_unlock(&tpg->tv_tpg_mutex); |
| } |
| |
| static struct se_portal_group * |
| scsiback_make_tpg(struct se_wwn *wwn, |
| struct config_group *group, |
| const char *name) |
| { |
| struct scsiback_tport *tport = container_of(wwn, |
| struct scsiback_tport, tport_wwn); |
| |
| struct scsiback_tpg *tpg; |
| u16 tpgt; |
| int ret; |
| |
| if (strstr(name, "tpgt_") != name) |
| return ERR_PTR(-EINVAL); |
| ret = kstrtou16(name + 5, 10, &tpgt); |
| if (ret) |
| return ERR_PTR(ret); |
| |
| tpg = kzalloc(sizeof(struct scsiback_tpg), GFP_KERNEL); |
| if (!tpg) |
| return ERR_PTR(-ENOMEM); |
| |
| mutex_init(&tpg->tv_tpg_mutex); |
| INIT_LIST_HEAD(&tpg->tv_tpg_list); |
| INIT_LIST_HEAD(&tpg->info_list); |
| tpg->tport = tport; |
| tpg->tport_tpgt = tpgt; |
| |
| ret = core_tpg_register(&scsiback_fabric_configfs->tf_ops, wwn, |
| &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL); |
| if (ret < 0) { |
| kfree(tpg); |
| return NULL; |
| } |
| mutex_lock(&scsiback_mutex); |
| list_add_tail(&tpg->tv_tpg_list, &scsiback_list); |
| mutex_unlock(&scsiback_mutex); |
| |
| return &tpg->se_tpg; |
| } |
| |
| static void scsiback_drop_tpg(struct se_portal_group *se_tpg) |
| { |
| struct scsiback_tpg *tpg = container_of(se_tpg, |
| struct scsiback_tpg, se_tpg); |
| |
| mutex_lock(&scsiback_mutex); |
| list_del(&tpg->tv_tpg_list); |
| mutex_unlock(&scsiback_mutex); |
| /* |
| * Release the virtual I_T Nexus for this xen-pvscsi TPG |
| */ |
| scsiback_drop_nexus(tpg); |
| /* |
| * Deregister the se_tpg from TCM.. |
| */ |
| core_tpg_deregister(se_tpg); |
| kfree(tpg); |
| } |
| |
| static int scsiback_check_true(struct se_portal_group *se_tpg) |
| { |
| return 1; |
| } |
| |
| static int scsiback_check_false(struct se_portal_group *se_tpg) |
| { |
| return 0; |
| } |
| |
| static struct target_core_fabric_ops scsiback_ops = { |
| .get_fabric_name = scsiback_get_fabric_name, |
| .get_fabric_proto_ident = scsiback_get_fabric_proto_ident, |
| .tpg_get_wwn = scsiback_get_fabric_wwn, |
| .tpg_get_tag = scsiback_get_tag, |
| .tpg_get_default_depth = scsiback_get_default_depth, |
| .tpg_get_pr_transport_id = scsiback_get_pr_transport_id, |
| .tpg_get_pr_transport_id_len = scsiback_get_pr_transport_id_len, |
| .tpg_parse_pr_out_transport_id = scsiback_parse_pr_out_transport_id, |
| .tpg_check_demo_mode = scsiback_check_true, |
| .tpg_check_demo_mode_cache = scsiback_check_true, |
| .tpg_check_demo_mode_write_protect = scsiback_check_false, |
| .tpg_check_prod_mode_write_protect = scsiback_check_false, |
| .tpg_alloc_fabric_acl = scsiback_alloc_fabric_acl, |
| .tpg_release_fabric_acl = scsiback_release_fabric_acl, |
| .tpg_get_inst_index = scsiback_tpg_get_inst_index, |
| .check_stop_free = scsiback_check_stop_free, |
| .release_cmd = scsiback_release_cmd, |
| .put_session = NULL, |
| .shutdown_session = scsiback_shutdown_session, |
| .close_session = scsiback_close_session, |
| .sess_get_index = scsiback_sess_get_index, |
| .sess_get_initiator_sid = NULL, |
| .write_pending = scsiback_write_pending, |
| .write_pending_status = scsiback_write_pending_status, |
| .set_default_node_attributes = scsiback_set_default_node_attrs, |
| .get_task_tag = scsiback_get_task_tag, |
| .get_cmd_state = scsiback_get_cmd_state, |
| .queue_data_in = scsiback_queue_data_in, |
| .queue_status = scsiback_queue_status, |
| .queue_tm_rsp = scsiback_queue_tm_rsp, |
| .aborted_task = scsiback_aborted_task, |
| /* |
| * Setup callers for generic logic in target_core_fabric_configfs.c |
| */ |
| .fabric_make_wwn = scsiback_make_tport, |
| .fabric_drop_wwn = scsiback_drop_tport, |
| .fabric_make_tpg = scsiback_make_tpg, |
| .fabric_drop_tpg = scsiback_drop_tpg, |
| .fabric_post_link = scsiback_port_link, |
| .fabric_pre_unlink = scsiback_port_unlink, |
| .fabric_make_np = NULL, |
| .fabric_drop_np = NULL, |
| #if 0 |
| .fabric_make_nodeacl = scsiback_make_nodeacl, |
| .fabric_drop_nodeacl = scsiback_drop_nodeacl, |
| #endif |
| }; |
| |
| static int scsiback_register_configfs(void) |
| { |
| struct target_fabric_configfs *fabric; |
| int ret; |
| |
| pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n", |
| VSCSI_VERSION, utsname()->sysname, utsname()->machine); |
| /* |
| * Register the top level struct config_item_type with TCM core |
| */ |
| fabric = target_fabric_configfs_init(THIS_MODULE, "xen-pvscsi"); |
| if (IS_ERR(fabric)) |
| return PTR_ERR(fabric); |
| |
| /* |
| * Setup fabric->tf_ops from our local scsiback_ops |
| */ |
| fabric->tf_ops = scsiback_ops; |
| /* |
| * Setup default attribute lists for various fabric->tf_cit_tmpl |
| */ |
| fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = scsiback_wwn_attrs; |
| fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = scsiback_tpg_attrs; |
| fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL; |
| fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = scsiback_param_attrs; |
| fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL; |
| fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL; |
| fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL; |
| fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL; |
| fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL; |
| /* |
| * Register the fabric for use within TCM |
| */ |
| ret = target_fabric_configfs_register(fabric); |
| if (ret < 0) { |
| target_fabric_configfs_free(fabric); |
| return ret; |
| } |
| /* |
| * Setup our local pointer to *fabric |
| */ |
| scsiback_fabric_configfs = fabric; |
| pr_debug("xen-pvscsi: Set fabric -> scsiback_fabric_configfs\n"); |
| return 0; |
| }; |
| |
| static void scsiback_deregister_configfs(void) |
| { |
| if (!scsiback_fabric_configfs) |
| return; |
| |
| target_fabric_configfs_deregister(scsiback_fabric_configfs); |
| scsiback_fabric_configfs = NULL; |
| pr_debug("xen-pvscsi: Cleared scsiback_fabric_configfs\n"); |
| }; |
| |
| static const struct xenbus_device_id scsiback_ids[] = { |
| { "vscsi" }, |
| { "" } |
| }; |
| |
| static struct xenbus_driver scsiback_driver = { |
| .ids = scsiback_ids, |
| .probe = scsiback_probe, |
| .remove = scsiback_remove, |
| .otherend_changed = scsiback_frontend_changed |
| }; |
| |
| static void scsiback_init_pend(void *p) |
| { |
| struct vscsibk_pend *pend = p; |
| int i; |
| |
| memset(pend, 0, sizeof(*pend)); |
| for (i = 0; i < VSCSI_MAX_GRANTS; i++) |
| pend->grant_handles[i] = SCSIBACK_INVALID_HANDLE; |
| } |
| |
| static int __init scsiback_init(void) |
| { |
| int ret; |
| |
| if (!xen_domain()) |
| return -ENODEV; |
| |
| scsiback_cachep = kmem_cache_create("vscsiif_cache", |
| sizeof(struct vscsibk_pend), 0, 0, scsiback_init_pend); |
| if (!scsiback_cachep) |
| return -ENOMEM; |
| |
| ret = xenbus_register_backend(&scsiback_driver); |
| if (ret) |
| goto out_cache_destroy; |
| |
| ret = scsiback_register_configfs(); |
| if (ret) |
| goto out_unregister_xenbus; |
| |
| return 0; |
| |
| out_unregister_xenbus: |
| xenbus_unregister_driver(&scsiback_driver); |
| out_cache_destroy: |
| kmem_cache_destroy(scsiback_cachep); |
| pr_err("xen-pvscsi: %s: error %d\n", __func__, ret); |
| return ret; |
| } |
| |
| static void __exit scsiback_exit(void) |
| { |
| struct page *page; |
| |
| while (free_pages_num) { |
| if (get_free_page(&page)) |
| BUG(); |
| gnttab_free_pages(1, &page); |
| } |
| scsiback_deregister_configfs(); |
| xenbus_unregister_driver(&scsiback_driver); |
| kmem_cache_destroy(scsiback_cachep); |
| } |
| |
| module_init(scsiback_init); |
| module_exit(scsiback_exit); |
| |
| MODULE_DESCRIPTION("Xen SCSI backend driver"); |
| MODULE_LICENSE("Dual BSD/GPL"); |
| MODULE_ALIAS("xen-backend:vscsi"); |
| MODULE_AUTHOR("Juergen Gross <jgross@suse.com>"); |