Lines Matching refs:info
131 static void scsifront_wake_up(struct vscsifrnt_info *info) in scsifront_wake_up() argument
133 info->wait_ring_available = 0; in scsifront_wake_up()
134 wake_up(&info->wq_sync); in scsifront_wake_up()
137 static int scsifront_get_rqid(struct vscsifrnt_info *info) in scsifront_get_rqid() argument
142 spin_lock_irqsave(&info->shadow_lock, flags); in scsifront_get_rqid()
144 free = find_first_bit(info->shadow_free_bitmap, VSCSIIF_MAX_REQS); in scsifront_get_rqid()
145 __clear_bit(free, info->shadow_free_bitmap); in scsifront_get_rqid()
147 spin_unlock_irqrestore(&info->shadow_lock, flags); in scsifront_get_rqid()
152 static int _scsifront_put_rqid(struct vscsifrnt_info *info, uint32_t id) in _scsifront_put_rqid() argument
154 int empty = bitmap_empty(info->shadow_free_bitmap, VSCSIIF_MAX_REQS); in _scsifront_put_rqid()
156 __set_bit(id, info->shadow_free_bitmap); in _scsifront_put_rqid()
157 info->shadow[id] = NULL; in _scsifront_put_rqid()
159 return empty || info->wait_ring_available; in _scsifront_put_rqid()
162 static void scsifront_put_rqid(struct vscsifrnt_info *info, uint32_t id) in scsifront_put_rqid() argument
167 spin_lock_irqsave(&info->shadow_lock, flags); in scsifront_put_rqid()
168 kick = _scsifront_put_rqid(info, id); in scsifront_put_rqid()
169 spin_unlock_irqrestore(&info->shadow_lock, flags); in scsifront_put_rqid()
172 scsifront_wake_up(info); in scsifront_put_rqid()
175 static struct vscsiif_request *scsifront_pre_req(struct vscsifrnt_info *info) in scsifront_pre_req() argument
177 struct vscsiif_front_ring *ring = &(info->ring); in scsifront_pre_req()
181 id = scsifront_get_rqid(info); /* use id in response */ in scsifront_pre_req()
185 ring_req = RING_GET_REQUEST(&(info->ring), ring->req_prod_pvt); in scsifront_pre_req()
194 static void scsifront_do_request(struct vscsifrnt_info *info) in scsifront_do_request() argument
196 struct vscsiif_front_ring *ring = &(info->ring); in scsifront_do_request()
201 notify_remote_via_irq(info->irq); in scsifront_do_request()
204 static void scsifront_gnttab_done(struct vscsifrnt_info *info, uint32_t id) in scsifront_gnttab_done() argument
206 struct vscsifrnt_shadow *s = info->shadow[id]; in scsifront_gnttab_done()
214 shost_printk(KERN_ALERT, info->host, KBUILD_MODNAME in scsifront_gnttab_done()
224 static void scsifront_cdb_cmd_done(struct vscsifrnt_info *info, in scsifront_cdb_cmd_done() argument
232 sc = info->shadow[id]->sc; in scsifront_cdb_cmd_done()
236 scsifront_gnttab_done(info, id); in scsifront_cdb_cmd_done()
237 scsifront_put_rqid(info, id); in scsifront_cdb_cmd_done()
251 static void scsifront_sync_cmd_done(struct vscsifrnt_info *info, in scsifront_sync_cmd_done() argument
256 struct vscsifrnt_shadow *shadow = info->shadow[id]; in scsifront_sync_cmd_done()
259 spin_lock_irqsave(&info->shadow_lock, flags); in scsifront_sync_cmd_done()
266 kick = _scsifront_put_rqid(info, id); in scsifront_sync_cmd_done()
267 spin_unlock_irqrestore(&info->shadow_lock, flags); in scsifront_sync_cmd_done()
270 scsifront_wake_up(info); in scsifront_sync_cmd_done()
273 shost_printk(KERN_ERR, info->host, KBUILD_MODNAME in scsifront_sync_cmd_done()
278 spin_unlock_irqrestore(&info->shadow_lock, flags); in scsifront_sync_cmd_done()
283 static void scsifront_do_response(struct vscsifrnt_info *info, in scsifront_do_response() argument
287 test_bit(ring_rsp->rqid, info->shadow_free_bitmap), in scsifront_do_response()
291 if (info->shadow[ring_rsp->rqid]->act == VSCSIIF_ACT_SCSI_CDB) in scsifront_do_response()
292 scsifront_cdb_cmd_done(info, ring_rsp); in scsifront_do_response()
294 scsifront_sync_cmd_done(info, ring_rsp); in scsifront_do_response()
297 static int scsifront_ring_drain(struct vscsifrnt_info *info) in scsifront_ring_drain() argument
303 rp = info->ring.sring->rsp_prod; in scsifront_ring_drain()
305 for (i = info->ring.rsp_cons; i != rp; i++) { in scsifront_ring_drain()
306 ring_rsp = RING_GET_RESPONSE(&info->ring, i); in scsifront_ring_drain()
307 scsifront_do_response(info, ring_rsp); in scsifront_ring_drain()
310 info->ring.rsp_cons = i; in scsifront_ring_drain()
312 if (i != info->ring.req_prod_pvt) in scsifront_ring_drain()
313 RING_FINAL_CHECK_FOR_RESPONSES(&info->ring, more_to_do); in scsifront_ring_drain()
315 info->ring.sring->rsp_event = i + 1; in scsifront_ring_drain()
320 static int scsifront_cmd_done(struct vscsifrnt_info *info) in scsifront_cmd_done() argument
325 spin_lock_irqsave(info->host->host_lock, flags); in scsifront_cmd_done()
327 more_to_do = scsifront_ring_drain(info); in scsifront_cmd_done()
329 info->wait_ring_available = 0; in scsifront_cmd_done()
331 spin_unlock_irqrestore(info->host->host_lock, flags); in scsifront_cmd_done()
333 wake_up(&info->wq_sync); in scsifront_cmd_done()
340 struct vscsifrnt_info *info = dev_id; in scsifront_irq_fn() local
342 while (scsifront_cmd_done(info)) in scsifront_irq_fn()
349 static void scsifront_finish_all(struct vscsifrnt_info *info) in scsifront_finish_all() argument
354 scsifront_ring_drain(info); in scsifront_finish_all()
357 if (test_bit(i, info->shadow_free_bitmap)) in scsifront_finish_all()
363 scsifront_do_response(info, &resp); in scsifront_finish_all()
367 static int map_data_for_request(struct vscsifrnt_info *info, in map_data_for_request() argument
390 if (data_grants > info->host->sg_tablesize) { in map_data_for_request()
391 shost_printk(KERN_ERR, info->host, KBUILD_MODNAME in map_data_for_request()
407 shost_printk(KERN_ERR, info->host, KBUILD_MODNAME in map_data_for_request()
423 info->dev->otherend_id, in map_data_for_request()
457 info->dev->otherend_id, in map_data_for_request()
485 struct vscsifrnt_info *info, struct scsi_cmnd *sc, in scsifront_command2ring() argument
492 ring_req = scsifront_pre_req(info); in scsifront_command2ring()
496 info->shadow[ring_req->rqid] = shadow; in scsifront_command2ring()
514 static int scsifront_enter(struct vscsifrnt_info *info) in scsifront_enter() argument
516 if (info->pause) in scsifront_enter()
518 info->callers++; in scsifront_enter()
522 static void scsifront_return(struct vscsifrnt_info *info) in scsifront_return() argument
524 info->callers--; in scsifront_return()
525 if (info->callers) in scsifront_return()
528 if (!info->waiting_pause) in scsifront_return()
531 info->waiting_pause = 0; in scsifront_return()
532 wake_up(&info->wq_pause); in scsifront_return()
538 struct vscsifrnt_info *info = shost_priv(shost); in scsifront_queuecommand() local
546 if (scsifront_enter(info)) { in scsifront_queuecommand()
550 if (RING_FULL(&info->ring)) in scsifront_queuecommand()
553 ring_req = scsifront_command2ring(info, sc, shadow); in scsifront_queuecommand()
565 err = map_data_for_request(info, sc, ring_req, shadow); in scsifront_queuecommand()
568 scsifront_put_rqid(info, rqid); in scsifront_queuecommand()
569 scsifront_return(info); in scsifront_queuecommand()
578 scsifront_do_request(info); in scsifront_queuecommand()
579 scsifront_return(info); in scsifront_queuecommand()
585 scsifront_return(info); in scsifront_queuecommand()
599 struct vscsifrnt_info *info = shost_priv(host); in scsifront_action_handler() local
611 if (!RING_FULL(&info->ring)) { in scsifront_action_handler()
612 ring_req = scsifront_command2ring(info, sc, shadow); in scsifront_action_handler()
616 if (err || info->pause) { in scsifront_action_handler()
621 info->wait_ring_available = 1; in scsifront_action_handler()
623 err = wait_event_interruptible(info->wq_sync, in scsifront_action_handler()
624 !info->wait_ring_available); in scsifront_action_handler()
628 if (scsifront_enter(info)) { in scsifront_action_handler()
642 scsifront_do_request(info); in scsifront_action_handler()
650 scsifront_put_rqid(info, shadow->rqid); in scsifront_action_handler()
653 spin_lock(&info->shadow_lock); in scsifront_action_handler()
655 spin_unlock(&info->shadow_lock); in scsifront_action_handler()
659 scsifront_return(info); in scsifront_action_handler()
678 struct vscsifrnt_info *info = shost_priv(sdev->host); in scsifront_sdev_configure() local
680 if (info && current == info->curr) in scsifront_sdev_configure()
681 xenbus_printf(XBT_NIL, info->dev->nodename, in scsifront_sdev_configure()
682 info->dev_state_path, "%d", XenbusStateConnected); in scsifront_sdev_configure()
689 struct vscsifrnt_info *info = shost_priv(sdev->host); in scsifront_sdev_destroy() local
691 if (info && current == info->curr) in scsifront_sdev_destroy()
692 xenbus_printf(XBT_NIL, info->dev->nodename, in scsifront_sdev_destroy()
693 info->dev_state_path, "%d", XenbusStateClosed); in scsifront_sdev_destroy()
713 static int scsifront_alloc_ring(struct vscsifrnt_info *info) in scsifront_alloc_ring() argument
715 struct xenbus_device *dev = info->dev; in scsifront_alloc_ring()
728 FRONT_RING_INIT(&info->ring, sring, PAGE_SIZE); in scsifront_alloc_ring()
737 info->ring_ref = gref; in scsifront_alloc_ring()
739 err = xenbus_alloc_evtchn(dev, &info->evtchn); in scsifront_alloc_ring()
745 err = bind_evtchn_to_irq(info->evtchn); in scsifront_alloc_ring()
751 info->irq = err; in scsifront_alloc_ring()
753 err = request_threaded_irq(info->irq, NULL, scsifront_irq_fn, in scsifront_alloc_ring()
754 IRQF_ONESHOT, "scsifront", info); in scsifront_alloc_ring()
764 unbind_from_irqhandler(info->irq, info); in scsifront_alloc_ring()
766 gnttab_end_foreign_access(info->ring_ref, 0, in scsifront_alloc_ring()
767 (unsigned long)info->ring.sring); in scsifront_alloc_ring()
772 static void scsifront_free_ring(struct vscsifrnt_info *info) in scsifront_free_ring() argument
774 unbind_from_irqhandler(info->irq, info); in scsifront_free_ring()
775 gnttab_end_foreign_access(info->ring_ref, 0, in scsifront_free_ring()
776 (unsigned long)info->ring.sring); in scsifront_free_ring()
779 static int scsifront_init_ring(struct vscsifrnt_info *info) in scsifront_init_ring() argument
781 struct xenbus_device *dev = info->dev; in scsifront_init_ring()
787 err = scsifront_alloc_ring(info); in scsifront_init_ring()
790 pr_debug("%s: %u %u\n", __func__, info->ring_ref, info->evtchn); in scsifront_init_ring()
798 info->ring_ref); in scsifront_init_ring()
805 info->evtchn); in scsifront_init_ring()
825 scsifront_free_ring(info); in scsifront_init_ring()
834 struct vscsifrnt_info *info; in scsifront_probe() local
839 host = scsi_host_alloc(&scsifront_sht, sizeof(*info)); in scsifront_probe()
844 info = (struct vscsifrnt_info *)host->hostdata; in scsifront_probe()
846 dev_set_drvdata(&dev->dev, info); in scsifront_probe()
847 info->dev = dev; in scsifront_probe()
849 bitmap_fill(info->shadow_free_bitmap, VSCSIIF_MAX_REQS); in scsifront_probe()
851 err = scsifront_init_ring(info); in scsifront_probe()
857 init_waitqueue_head(&info->wq_sync); in scsifront_probe()
858 init_waitqueue_head(&info->wq_pause); in scsifront_probe()
859 spin_lock_init(&info->shadow_lock); in scsifront_probe()
874 info->host = host; in scsifront_probe()
875 info->host_active = 1; in scsifront_probe()
882 scsifront_free_ring(info); in scsifront_probe()
889 struct vscsifrnt_info *info = dev_get_drvdata(&dev->dev); in scsifront_resume() local
890 struct Scsi_Host *host = info->host; in scsifront_resume()
896 scsifront_finish_all(info); in scsifront_resume()
901 scsifront_free_ring(info); in scsifront_resume()
902 err = scsifront_init_ring(info); in scsifront_resume()
916 struct vscsifrnt_info *info = dev_get_drvdata(&dev->dev); in scsifront_suspend() local
917 struct Scsi_Host *host = info->host; in scsifront_suspend()
922 info->pause = 1; in scsifront_suspend()
923 while (info->callers && !err) { in scsifront_suspend()
924 info->waiting_pause = 1; in scsifront_suspend()
925 info->wait_ring_available = 0; in scsifront_suspend()
927 wake_up(&info->wq_sync); in scsifront_suspend()
928 err = wait_event_interruptible(info->wq_pause, in scsifront_suspend()
929 !info->waiting_pause); in scsifront_suspend()
938 struct vscsifrnt_info *info = dev_get_drvdata(&dev->dev); in scsifront_remove() local
943 if (info->host_active) { in scsifront_remove()
945 scsi_remove_host(info->host); in scsifront_remove()
946 info->host_active = 0; in scsifront_remove()
950 scsifront_free_ring(info); in scsifront_remove()
951 scsi_host_put(info->host); in scsifront_remove()
956 static void scsifront_disconnect(struct vscsifrnt_info *info) in scsifront_disconnect() argument
958 struct xenbus_device *dev = info->dev; in scsifront_disconnect()
959 struct Scsi_Host *host = info->host; in scsifront_disconnect()
970 if (info->host_active) { in scsifront_disconnect()
972 info->host_active = 0; in scsifront_disconnect()
979 static void scsifront_do_lun_hotplug(struct vscsifrnt_info *info, int op) in scsifront_do_lun_hotplug() argument
981 struct xenbus_device *dev = info->dev; in scsifront_do_lun_hotplug()
995 BUG_ON(info->curr); in scsifront_do_lun_hotplug()
996 info->curr = current; in scsifront_do_lun_hotplug()
1018 snprintf(info->dev_state_path, sizeof(info->dev_state_path), in scsifront_do_lun_hotplug()
1026 if (scsi_add_device(info->host, chn, tgt, lun)) { in scsifront_do_lun_hotplug()
1029 info->dev_state_path, in scsifront_do_lun_hotplug()
1037 sdev = scsi_device_lookup(info->host, chn, tgt, lun); in scsifront_do_lun_hotplug()
1046 info->dev_state_path, in scsifront_do_lun_hotplug()
1054 info->curr = NULL; in scsifront_do_lun_hotplug()
1060 struct vscsifrnt_info *info) in scsifront_read_backend_params() argument
1064 struct Scsi_Host *host = info->host; in scsifront_read_backend_params()
1076 if (!info->pause && sg_grant) in scsifront_read_backend_params()
1078 else if (info->pause && nr_segs < host->sg_tablesize) in scsifront_read_backend_params()
1090 struct vscsifrnt_info *info = dev_get_drvdata(&dev->dev); in scsifront_backend_changed() local
1102 scsifront_read_backend_params(dev, info); in scsifront_backend_changed()
1104 if (info->pause) { in scsifront_backend_changed()
1105 scsifront_do_lun_hotplug(info, VSCSIFRONT_OP_READD_LUN); in scsifront_backend_changed()
1107 info->pause = 0; in scsifront_backend_changed()
1113 scsifront_do_lun_hotplug(info, VSCSIFRONT_OP_ADD_LUN); in scsifront_backend_changed()
1124 scsifront_disconnect(info); in scsifront_backend_changed()
1128 scsifront_do_lun_hotplug(info, VSCSIFRONT_OP_DEL_LUN); in scsifront_backend_changed()
1133 scsifront_do_lun_hotplug(info, VSCSIFRONT_OP_ADD_LUN); in scsifront_backend_changed()