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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c 
 kernel/drivers/scsi/virtio_scsi.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * Virtio SCSI HBA driver
34  *
....@@ -7,10 +8,6 @@
78  * Authors:
89  *  Stefan Hajnoczi   <stefanha@linux.vnet.ibm.com>
910  *  Paolo Bonzini   <pbonzini@redhat.com>
10
- *
11
- * This work is licensed under the terms of the GNU GPL, version 2 or later.
12
- * See the COPYING file in the top-level directory.
13
- *
1411  */
1512 
1613 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
....@@ -32,6 +29,8 @@
3229 #include <scsi/scsi_devinfo.h>
3330 #include <linux/seqlock.h>
3431 #include <linux/blk-mq-virtio.h>
32
+
33
+#include "sd.h"
3534 
3635 #define VIRTIO_SCSI_MEMPOOL_SZ 64
3736 #define VIRTIO_SCSI_EVENT_LEN 8
....@@ -68,33 +67,6 @@
6867 	struct virtqueue *vq;
6968 };
7069 
71
-/*
72
- * Per-target queue state.
73
- *
74
- * This struct holds the data needed by the queue steering policy.  When a
75
- * target is sent multiple requests, we need to drive them to the same queue so
76
- * that FIFO processing order is kept.  However, if a target was idle, we can
77
- * choose a queue arbitrarily.  In this case the queue is chosen according to
78
- * the current VCPU, so the driver expects the number of request queues to be
79
- * equal to the number of VCPUs.  This makes it easy and fast to select the
80
- * queue, and also lets the driver optimize the IRQ affinity for the virtqueues
81
- * (each virtqueue's affinity is set to the CPU that "owns" the queue).
82
- *
83
- * tgt_seq is held to serialize reading and writing req_vq.
84
- *
85
- * Decrements of reqs are never concurrent with writes of req_vq: before the
86
- * decrement reqs will be != 0; after the decrement the virtqueue completion
87
- * routine will not use the req_vq so it can be changed by a new request.
88
- * Thus they can happen outside the tgt_seq, provided of course we make reqs
89
- * an atomic_t.
90
- */
91
-struct virtio_scsi_target_state {
92
-	seqcount_t tgt_seq;
93
-
94
-	/* Currently active virtqueue for requests sent to this target. */
95
-	struct virtio_scsi_vq *req_vq;
96
-};
97
-
9870 /* Driver instance state */
9971 struct virtio_scsi {
10072 	struct virtio_device *vdev;
....@@ -103,9 +75,6 @@
10375 	struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN];
10476 
10577 	u32 num_queues;
106
-
107
-	/* If the affinity hint is set for virtqueues */
108
-	bool affinity_hint_set;
10978 
11079 	struct hlist_node node;
11180 
....@@ -127,19 +96,11 @@
12796 
12897 static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid)
12998 {
130
-	if (!resid)
131
-		return;
132
-
133
-	if (!scsi_bidi_cmnd(sc)) {
99
+	if (resid)
134100 		scsi_set_resid(sc, resid);
135
-		return;
136
-	}
137
-
138
-	scsi_in(sc)->resid = min(resid, scsi_in(sc)->length);
139
-	scsi_out(sc)->resid = resid - scsi_in(sc)->resid;
140101 }
141102 
142
-/**
103
+/*
143104  * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done
144105  *
145106  * Called with vq_lock held.
....@@ -187,7 +148,7 @@
187148 	default:
188149 		scmd_printk(KERN_WARNING, sc, "Unknown response %d",
189150 			    resp->response);
190
-		/* fall through */
151
+		fallthrough;
191152 	case VIRTIO_SCSI_S_FAILURE:
192153 		set_host_byte(sc, DID_ERROR);
193154 		break;
....@@ -323,7 +284,12 @@
323284 
324285 	switch (virtio32_to_cpu(vscsi->vdev, event->reason)) {
325286 	case VIRTIO_SCSI_EVT_RESET_RESCAN:
326
-		scsi_add_device(shost, 0, target, lun);
287
+		if (lun == 0) {
288
+			scsi_scan_target(&shost->shost_gendev, 0, target,
289
+					 SCAN_WILD_CARD, SCSI_SCAN_INITIAL);
290
+		} else {
291
+			scsi_add_device(shost, 0, target, lun);
292
+		}
327293 		break;
328294 	case VIRTIO_SCSI_EVT_RESET_REMOVED:
329295 		sdev = scsi_device_lookup(shost, 0, target, lun);
....@@ -365,6 +331,44 @@
365331 	scsi_device_put(sdev);
366332 }
367333 
334
+static void virtscsi_rescan_hotunplug(struct virtio_scsi *vscsi)
335
+{
336
+	struct scsi_device *sdev;
337
+	struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
338
+	unsigned char scsi_cmd[MAX_COMMAND_SIZE];
339
+	int result, inquiry_len, inq_result_len = 256;
340
+	char *inq_result = kmalloc(inq_result_len, GFP_KERNEL);
341
+
342
+	shost_for_each_device(sdev, shost) {
343
+		inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
344
+
345
+		memset(scsi_cmd, 0, sizeof(scsi_cmd));
346
+		scsi_cmd[0] = INQUIRY;
347
+		scsi_cmd[4] = (unsigned char) inquiry_len;
348
+
349
+		memset(inq_result, 0, inq_result_len);
350
+
351
+		result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
352
+					  inq_result, inquiry_len, NULL,
353
+					  SD_TIMEOUT, SD_MAX_RETRIES, NULL);
354
+
355
+		if (result == 0 && inq_result[0] >> 5) {
356
+			/* PQ indicates the LUN is not attached */
357
+			scsi_remove_device(sdev);
358
+		} else if (host_byte(result) == DID_BAD_TARGET) {
359
+			/*
360
+			 * If all LUNs of a virtio-scsi device are unplugged
361
+			 * it will respond with BAD TARGET on any INQUIRY
362
+			 * command.
363
+			 * Remove the device in this case as well.
364
+			 */
365
+			scsi_remove_device(sdev);
366
+		}
367
+	}
368
+
369
+	kfree(inq_result);
370
+}
371
+
368372 static void virtscsi_handle_event(struct work_struct *work)
369373 {
370374 	struct virtio_scsi_event_node *event_node =
....@@ -376,6 +380,7 @@
376380 	    cpu_to_virtio32(vscsi->vdev, VIRTIO_SCSI_T_EVENTS_MISSED)) {
377381 		event->event &= ~cpu_to_virtio32(vscsi->vdev,
378382 						   VIRTIO_SCSI_T_EVENTS_MISSED);
383
+		virtscsi_rescan_hotunplug(vscsi);
379384 		scsi_scan_host(virtio_scsi_host(vscsi->vdev));
380385 	}
381386 
....@@ -410,14 +415,7 @@
410415 	virtscsi_vq_done(vscsi, &vscsi->event_vq, virtscsi_complete_event);
411416 };
412417 
413
-/**
414
- * virtscsi_add_cmd - add a virtio_scsi_cmd to a virtqueue
415
- * @vq		: the struct virtqueue we're talking about
416
- * @cmd		: command structure
417
- * @req_size	: size of the request buffer
418
- * @resp_size	: size of the response buffer
419
- */
420
-static int virtscsi_add_cmd(struct virtqueue *vq,
418
+static int __virtscsi_add_cmd(struct virtqueue *vq,
421419 			    struct virtio_scsi_cmd *cmd,
422420 			    size_t req_size, size_t resp_size)
423421 {
....@@ -430,9 +428,9 @@
430428 
431429 	if (sc && sc->sc_data_direction != DMA_NONE) {
432430 		if (sc->sc_data_direction != DMA_FROM_DEVICE)
433
-			out = &scsi_out(sc)->table;
431
+			out = &sc->sdb.table;
434432 		if (sc->sc_data_direction != DMA_TO_DEVICE)
435
-			in = &scsi_in(sc)->table;
433
+			in = &sc->sdb.table;
436434 	}
437435 
438436 	/* Request header.  */
....@@ -462,17 +460,39 @@
462460 	return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, GFP_ATOMIC);
463461 }
464462 
465
-static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq,
463
+static void virtscsi_kick_vq(struct virtio_scsi_vq *vq)
464
+{
465
+	bool needs_kick;
466
+	unsigned long flags;
467
+
468
+	spin_lock_irqsave(&vq->vq_lock, flags);
469
+	needs_kick = virtqueue_kick_prepare(vq->vq);
470
+	spin_unlock_irqrestore(&vq->vq_lock, flags);
471
+
472
+	if (needs_kick)
473
+		virtqueue_notify(vq->vq);
474
+}
475
+
476
+/**
477
+ * virtscsi_add_cmd - add a virtio_scsi_cmd to a virtqueue, optionally kick it
478
+ * @vq		: the struct virtqueue we're talking about
479
+ * @cmd		: command structure
480
+ * @req_size	: size of the request buffer
481
+ * @resp_size	: size of the response buffer
482
+ * @kick	: whether to kick the virtqueue immediately
483
+ */
484
+static int virtscsi_add_cmd(struct virtio_scsi_vq *vq,
466485 			     struct virtio_scsi_cmd *cmd,
467
-			     size_t req_size, size_t resp_size)
486
+			     size_t req_size, size_t resp_size,
487
+			     bool kick)
468488 {
469489 	unsigned long flags;
470490 	int err;
471491 	bool needs_kick = false;
472492 
473493 	spin_lock_irqsave(&vq->vq_lock, flags);
474
-	err = virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size);
475
-	if (!err)
494
+	err = __virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size);
495
+	if (!err && kick)
476496 		needs_kick = virtqueue_kick_prepare(vq->vq);
477497 
478498 	spin_unlock_irqrestore(&vq->vq_lock, flags);
....@@ -537,6 +557,7 @@
537557 	struct virtio_scsi *vscsi = shost_priv(shost);
538558 	struct virtio_scsi_vq *req_vq = virtscsi_pick_vq_mq(vscsi, sc);
539559 	struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc);
560
+	bool kick;
540561 	unsigned long flags;
541562 	int req_size;
542563 	int ret;
....@@ -566,7 +587,8 @@
566587 		req_size = sizeof(cmd->req.cmd);
567588 	}
568589 
569
-	ret = virtscsi_kick_cmd(req_vq, cmd, req_size, sizeof(cmd->resp.cmd));
590
+	kick = (sc->flags & SCMD_LAST) != 0;
591
+	ret = virtscsi_add_cmd(req_vq, cmd, req_size, sizeof(cmd->resp.cmd), kick);
570592 	if (ret == -EIO) {
571593 		cmd->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET;
572594 		spin_lock_irqsave(&req_vq->vq_lock, flags);
....@@ -584,8 +606,8 @@
584606 	int ret = FAILED;
585607 
586608 	cmd->comp = &comp;
587
-	if (virtscsi_kick_cmd(&vscsi->ctrl_vq, cmd,
588
-			      sizeof cmd->req.tmf, sizeof cmd->resp.tmf) < 0)
609
+	if (virtscsi_add_cmd(&vscsi->ctrl_vq, cmd,
610
+			      sizeof cmd->req.tmf, sizeof cmd->resp.tmf, true) < 0)
589611 		goto out;
590612 
591613 	wait_for_completion(&comp);
....@@ -691,34 +713,19 @@
691713 	return virtscsi_tmf(vscsi, cmd);
692714 }
693715 
694
-static int virtscsi_target_alloc(struct scsi_target *starget)
695
-{
696
-	struct Scsi_Host *sh = dev_to_shost(starget->dev.parent);
697
-	struct virtio_scsi *vscsi = shost_priv(sh);
698
-
699
-	struct virtio_scsi_target_state *tgt =
700
-				kmalloc(sizeof(*tgt), GFP_KERNEL);
701
-	if (!tgt)
702
-		return -ENOMEM;
703
-
704
-	seqcount_init(&tgt->tgt_seq);
705
-	tgt->req_vq = &vscsi->req_vqs[0];
706
-
707
-	starget->hostdata = tgt;
708
-	return 0;
709
-}
710
-
711
-static void virtscsi_target_destroy(struct scsi_target *starget)
712
-{
713
-	struct virtio_scsi_target_state *tgt = starget->hostdata;
714
-	kfree(tgt);
715
-}
716
-
717716 static int virtscsi_map_queues(struct Scsi_Host *shost)
718717 {
719718 	struct virtio_scsi *vscsi = shost_priv(shost);
719
+	struct blk_mq_queue_map *qmap = &shost->tag_set.map[HCTX_TYPE_DEFAULT];
720720 
721
-	return blk_mq_virtio_map_queues(&shost->tag_set, vscsi->vdev, 2);
721
+	return blk_mq_virtio_map_queues(qmap, vscsi->vdev, 2);
722
+}
723
+
724
+static void virtscsi_commit_rqs(struct Scsi_Host *shost, u16 hwq)
725
+{
726
+	struct virtio_scsi *vscsi = shost_priv(shost);
727
+
728
+	virtscsi_kick_vq(&vscsi->req_vqs[hwq]);
722729 }
723730 
724731 /*
....@@ -738,6 +745,7 @@
738745 	.this_id = -1,
739746 	.cmd_size = sizeof(struct virtio_scsi_cmd),
740747 	.queuecommand = virtscsi_queuecommand,
748
+	.commit_rqs = virtscsi_commit_rqs,
741749 	.change_queue_depth = virtscsi_change_queue_depth,
742750 	.eh_abort_handler = virtscsi_abort,
743751 	.eh_device_reset_handler = virtscsi_device_reset,
....@@ -745,24 +753,20 @@
745753 	.slave_alloc = virtscsi_device_alloc,
746754 
747755 	.dma_boundary = UINT_MAX,
748
-	.use_clustering = ENABLE_CLUSTERING,
749
-	.target_alloc = virtscsi_target_alloc,
750
-	.target_destroy = virtscsi_target_destroy,
751756 	.map_queues = virtscsi_map_queues,
752757 	.track_queue_depth = 1,
753
-	.force_blk_mq = 1,
754758 };
755759 
756760 #define virtscsi_config_get(vdev, fld) \
757761 	({ \
758
-		typeof(((struct virtio_scsi_config *)0)->fld) __val; \
762
+		__virtio_native_type(struct virtio_scsi_config, fld) __val; \
759763 		virtio_cread(vdev, struct virtio_scsi_config, fld, &__val); \
760764 		__val; \
761765 	})
762766 
763767 #define virtscsi_config_set(vdev, fld, val) \
764768 	do { \
765
-		typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \
769
+		__virtio_native_type(struct virtio_scsi_config, fld) __val = (val); \
766770 		virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \
767771 	} while(0)
768772 
....@@ -853,11 +857,12 @@
853857 
854858 	/* We need to know how many queues before we allocate. */
855859 	num_queues = virtscsi_config_get(vdev, num_queues) ? : 1;
860
+	num_queues = min_t(unsigned int, nr_cpu_ids, num_queues);
856861 
857862 	num_targets = virtscsi_config_get(vdev, max_target) + 1;
858863 
859864 	shost = scsi_host_alloc(&virtscsi_host_template,
860
-		sizeof(*vscsi) + sizeof(vscsi->req_vqs[0]) * num_queues);
865
+				struct_size(vscsi, req_vqs, num_queues));
861866 	if (!shost)
862867 		return -ENOMEM;
863868 
....@@ -1010,14 +1015,10 @@
10101015 	return 0;
10111016 
10121017 error:
1013
-	if (virtscsi_cmd_pool) {
1014
-		mempool_destroy(virtscsi_cmd_pool);
1015
-		virtscsi_cmd_pool = NULL;
1016
-	}
1017
-	if (virtscsi_cmd_cache) {
1018
-		kmem_cache_destroy(virtscsi_cmd_cache);
1019
-		virtscsi_cmd_cache = NULL;
1020
-	}
1018
+	mempool_destroy(virtscsi_cmd_pool);
1019
+	virtscsi_cmd_pool = NULL;
1020
+	kmem_cache_destroy(virtscsi_cmd_cache);
1021
+	virtscsi_cmd_cache = NULL;
10211022 	return ret;
10221023 }
10231024