2 * ccw based virtio transport
4 * Copyright IBM Corp. 2012, 2014
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
10 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
13 #include <linux/kernel_stat.h>
14 #include <linux/init.h>
15 #include <linux/bootmem.h>
16 #include <linux/err.h>
17 #include <linux/virtio.h>
18 #include <linux/virtio_config.h>
19 #include <linux/slab.h>
20 #include <linux/interrupt.h>
21 #include <linux/virtio_ring.h>
22 #include <linux/pfn.h>
23 #include <linux/async.h>
24 #include <linux/wait.h>
25 #include <linux/list.h>
26 #include <linux/bitops.h>
27 #include <linux/moduleparam.h>
29 #include <linux/kvm_para.h>
30 #include <linux/notifier.h>
32 #include <asm/setup.h>
35 #include <asm/ccwdev.h>
36 #include <asm/virtio-ccw.h>
41 * virtio related functions
44 struct vq_config_block {
49 #define VIRTIO_CCW_CONFIG_SIZE 0x100
50 /* same as PCI config space size, should be enough for all drivers */
52 struct virtio_ccw_device {
53 struct virtio_device vdev;
55 __u8 config[VIRTIO_CCW_CONFIG_SIZE];
56 struct ccw_device *cdev;
59 unsigned int revision; /* Transport revision */
60 wait_queue_head_t wait_q;
62 struct mutex io_lock; /* Serializes I/O requests */
63 struct list_head virtqueues;
64 unsigned long indicators;
65 unsigned long indicators2;
66 struct vq_config_block *config_block;
70 unsigned int config_ready;
74 struct vq_info_block_legacy {
81 struct vq_info_block {
90 struct virtio_feature_desc {
95 struct virtio_thinint_area {
96 unsigned long summary_indicator;
97 unsigned long indicator;
102 struct virtio_rev_info {
108 /* the highest virtio-ccw revision we support */
109 #define VIRTIO_CCW_REV_MAX 2
111 struct virtio_ccw_vq_info {
112 struct virtqueue *vq;
116 struct vq_info_block s;
117 struct vq_info_block_legacy l;
120 struct list_head node;
124 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */
126 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8)
127 #define MAX_AIRQ_AREAS 20
129 static int virtio_ccw_use_airq = 1;
133 u8 summary_indicator;
134 struct airq_struct airq;
137 static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
139 #define CCW_CMD_SET_VQ 0x13
140 #define CCW_CMD_VDEV_RESET 0x33
141 #define CCW_CMD_SET_IND 0x43
142 #define CCW_CMD_SET_CONF_IND 0x53
143 #define CCW_CMD_READ_FEAT 0x12
144 #define CCW_CMD_WRITE_FEAT 0x11
145 #define CCW_CMD_READ_CONF 0x22
146 #define CCW_CMD_WRITE_CONF 0x21
147 #define CCW_CMD_WRITE_STATUS 0x31
148 #define CCW_CMD_READ_VQ_CONF 0x32
149 #define CCW_CMD_READ_STATUS 0x72
150 #define CCW_CMD_SET_IND_ADAPTER 0x73
151 #define CCW_CMD_SET_VIRTIO_REV 0x83
153 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000
154 #define VIRTIO_CCW_DOING_RESET 0x00040000
155 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000
156 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000
157 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000
158 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000
159 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000
160 #define VIRTIO_CCW_DOING_SET_IND 0x01000000
161 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
162 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
163 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000
164 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
165 #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000
166 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000
168 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
170 return container_of(vdev, struct virtio_ccw_device, vdev);
173 static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info)
175 unsigned long i, flags;
177 write_lock_irqsave(&info->lock, flags);
178 for (i = 0; i < airq_iv_end(info->aiv); i++) {
179 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) {
180 airq_iv_free_bit(info->aiv, i);
181 airq_iv_set_ptr(info->aiv, i, 0);
185 write_unlock_irqrestore(&info->lock, flags);
188 static void virtio_airq_handler(struct airq_struct *airq)
190 struct airq_info *info = container_of(airq, struct airq_info, airq);
193 inc_irq_stat(IRQIO_VAI);
194 read_lock(&info->lock);
195 /* Walk through indicators field, summary indicator active. */
197 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
200 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
202 info->summary_indicator = 0;
204 /* Walk through indicators field, summary indicator not active. */
206 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
209 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
211 read_unlock(&info->lock);
214 static struct airq_info *new_airq_info(void)
216 struct airq_info *info;
219 info = kzalloc(sizeof(*info), GFP_KERNEL);
222 rwlock_init(&info->lock);
223 info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR);
228 info->airq.handler = virtio_airq_handler;
229 info->airq.lsi_ptr = &info->summary_indicator;
230 info->airq.lsi_mask = 0xff;
231 info->airq.isc = VIRTIO_AIRQ_ISC;
232 rc = register_adapter_interrupt(&info->airq);
234 airq_iv_release(info->aiv);
241 static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs,
242 u64 *first, void **airq_info)
245 struct airq_info *info;
246 unsigned long indicator_addr = 0;
247 unsigned long bit, flags;
249 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) {
251 airq_areas[i] = new_airq_info();
252 info = airq_areas[i];
255 write_lock_irqsave(&info->lock, flags);
256 bit = airq_iv_alloc(info->aiv, nvqs);
258 /* Not enough vacancies. */
259 write_unlock_irqrestore(&info->lock, flags);
264 indicator_addr = (unsigned long)info->aiv->vector;
265 for (j = 0; j < nvqs; j++) {
266 airq_iv_set_ptr(info->aiv, bit + j,
267 (unsigned long)vqs[j]);
269 write_unlock_irqrestore(&info->lock, flags);
271 return indicator_addr;
274 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev)
276 struct virtio_ccw_vq_info *info;
278 if (!vcdev->airq_info)
280 list_for_each_entry(info, &vcdev->virtqueues, node)
281 drop_airq_indicator(info->vq, vcdev->airq_info);
284 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag)
289 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
293 ret = vcdev->curr_io & flag;
294 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
298 static int ccw_io_helper(struct virtio_ccw_device *vcdev,
299 struct ccw1 *ccw, __u32 intparm)
303 int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
305 mutex_lock(&vcdev->io_lock);
307 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
308 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
312 vcdev->curr_io |= flag;
314 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
316 } while (ret == -EBUSY);
317 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
318 ret = ret ? ret : vcdev->err;
319 mutex_unlock(&vcdev->io_lock);
323 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
327 unsigned long *indicatorp = NULL;
328 struct virtio_thinint_area *thinint_area = NULL;
329 struct airq_info *airq_info = vcdev->airq_info;
331 if (vcdev->is_thinint) {
332 thinint_area = kzalloc(sizeof(*thinint_area),
333 GFP_DMA | GFP_KERNEL);
336 thinint_area->summary_indicator =
337 (unsigned long) &airq_info->summary_indicator;
338 thinint_area->isc = VIRTIO_AIRQ_ISC;
339 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
340 ccw->count = sizeof(*thinint_area);
341 ccw->cda = (__u32)(unsigned long) thinint_area;
343 /* payload is the address of the indicators */
344 indicatorp = kmalloc(sizeof(&vcdev->indicators),
345 GFP_DMA | GFP_KERNEL);
349 ccw->cmd_code = CCW_CMD_SET_IND;
350 ccw->count = sizeof(&vcdev->indicators);
351 ccw->cda = (__u32)(unsigned long) indicatorp;
353 /* Deregister indicators from host. */
354 vcdev->indicators = 0;
356 ret = ccw_io_helper(vcdev, ccw,
358 VIRTIO_CCW_DOING_SET_IND_ADAPTER :
359 VIRTIO_CCW_DOING_SET_IND);
360 if (ret && (ret != -ENODEV))
361 dev_info(&vcdev->cdev->dev,
362 "Failed to deregister indicators (%d)\n", ret);
363 else if (vcdev->is_thinint)
364 virtio_ccw_drop_indicators(vcdev);
369 static inline long __do_kvm_notify(struct subchannel_id schid,
370 unsigned long queue_index,
373 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
374 register struct subchannel_id __schid asm("2") = schid;
375 register unsigned long __index asm("3") = queue_index;
376 register long __rc asm("2");
377 register long __cookie asm("4") = cookie;
379 asm volatile ("diag 2,4,0x500\n"
380 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index),
386 static inline long do_kvm_notify(struct subchannel_id schid,
387 unsigned long queue_index,
390 diag_stat_inc(DIAG_STAT_X500);
391 return __do_kvm_notify(schid, queue_index, cookie);
394 static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
396 struct virtio_ccw_vq_info *info = vq->priv;
397 struct virtio_ccw_device *vcdev;
398 struct subchannel_id schid;
400 vcdev = to_vc_device(info->vq->vdev);
401 ccw_device_get_schid(vcdev->cdev, &schid);
402 info->cookie = do_kvm_notify(schid, vq->index, info->cookie);
403 if (info->cookie < 0)
408 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
409 struct ccw1 *ccw, int index)
413 vcdev->config_block->index = index;
414 ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
416 ccw->count = sizeof(struct vq_config_block);
417 ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
418 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
421 return vcdev->config_block->num ?: -ENOENT;
424 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
426 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
427 struct virtio_ccw_vq_info *info = vq->priv;
431 unsigned int index = vq->index;
433 /* Remove from our list. */
434 spin_lock_irqsave(&vcdev->lock, flags);
435 list_del(&info->node);
436 spin_unlock_irqrestore(&vcdev->lock, flags);
438 /* Release from host. */
439 if (vcdev->revision == 0) {
440 info->info_block->l.queue = 0;
441 info->info_block->l.align = 0;
442 info->info_block->l.index = index;
443 info->info_block->l.num = 0;
444 ccw->count = sizeof(info->info_block->l);
446 info->info_block->s.desc = 0;
447 info->info_block->s.index = index;
448 info->info_block->s.num = 0;
449 info->info_block->s.avail = 0;
450 info->info_block->s.used = 0;
451 ccw->count = sizeof(info->info_block->s);
453 ccw->cmd_code = CCW_CMD_SET_VQ;
455 ccw->cda = (__u32)(unsigned long)(info->info_block);
456 ret = ccw_io_helper(vcdev, ccw,
457 VIRTIO_CCW_DOING_SET_VQ | index);
459 * -ENODEV isn't considered an error: The device is gone anyway.
460 * This may happen on device detach.
462 if (ret && (ret != -ENODEV))
463 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n",
466 vring_del_virtqueue(vq);
467 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
468 free_pages_exact(info->queue, size);
469 kfree(info->info_block);
473 static void virtio_ccw_del_vqs(struct virtio_device *vdev)
475 struct virtqueue *vq, *n;
477 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
479 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
483 virtio_ccw_drop_indicator(vcdev, ccw);
485 list_for_each_entry_safe(vq, n, &vdev->vqs, list)
486 virtio_ccw_del_vq(vq, ccw);
491 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
492 int i, vq_callback_t *callback,
493 const char *name, bool ctx,
496 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
498 struct virtqueue *vq = NULL;
499 struct virtio_ccw_vq_info *info;
500 unsigned long size = 0; /* silence the compiler */
503 /* Allocate queue. */
504 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
506 dev_warn(&vcdev->cdev->dev, "no info\n");
510 info->info_block = kzalloc(sizeof(*info->info_block),
511 GFP_DMA | GFP_KERNEL);
512 if (!info->info_block) {
513 dev_warn(&vcdev->cdev->dev, "no info block\n");
517 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
522 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
523 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
524 if (info->queue == NULL) {
525 dev_warn(&vcdev->cdev->dev, "no queue\n");
530 vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
531 true, ctx, info->queue, virtio_ccw_kvm_notify,
534 /* For now, we fail if we can't get the requested size. */
535 dev_warn(&vcdev->cdev->dev, "no vq\n");
540 /* Register it with the host. */
541 if (vcdev->revision == 0) {
542 info->info_block->l.queue = (__u64)info->queue;
543 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
544 info->info_block->l.index = i;
545 info->info_block->l.num = info->num;
546 ccw->count = sizeof(info->info_block->l);
548 info->info_block->s.desc = (__u64)info->queue;
549 info->info_block->s.index = i;
550 info->info_block->s.num = info->num;
551 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);
552 info->info_block->s.used = (__u64)virtqueue_get_used(vq);
553 ccw->count = sizeof(info->info_block->s);
555 ccw->cmd_code = CCW_CMD_SET_VQ;
557 ccw->cda = (__u32)(unsigned long)(info->info_block);
558 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
560 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
567 /* Save it to our list. */
568 spin_lock_irqsave(&vcdev->lock, flags);
569 list_add(&info->node, &vcdev->virtqueues);
570 spin_unlock_irqrestore(&vcdev->lock, flags);
576 vring_del_virtqueue(vq);
579 free_pages_exact(info->queue, size);
580 kfree(info->info_block);
586 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
587 struct virtqueue *vqs[], int nvqs,
591 struct virtio_thinint_area *thinint_area = NULL;
592 struct airq_info *info;
594 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL);
599 /* Try to get an indicator. */
600 thinint_area->indicator = get_airq_indicator(vqs, nvqs,
601 &thinint_area->bit_nr,
603 if (!thinint_area->indicator) {
607 info = vcdev->airq_info;
608 thinint_area->summary_indicator =
609 (unsigned long) &info->summary_indicator;
610 thinint_area->isc = VIRTIO_AIRQ_ISC;
611 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
612 ccw->flags = CCW_FLAG_SLI;
613 ccw->count = sizeof(*thinint_area);
614 ccw->cda = (__u32)(unsigned long)thinint_area;
615 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
617 if (ret == -EOPNOTSUPP) {
619 * The host does not support adapter interrupts
620 * for virtio-ccw, stop trying.
622 virtio_ccw_use_airq = 0;
623 pr_info("Adapter interrupts unsupported on host\n");
625 dev_warn(&vcdev->cdev->dev,
626 "enabling adapter interrupts = %d\n", ret);
627 virtio_ccw_drop_indicators(vcdev);
634 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
635 struct virtqueue *vqs[],
636 vq_callback_t *callbacks[],
637 const char * const names[],
639 struct irq_affinity *desc)
641 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
642 unsigned long *indicatorp = NULL;
646 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
650 for (i = 0; i < nvqs; ++i) {
651 vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i],
652 ctx ? ctx[i] : false, ccw);
653 if (IS_ERR(vqs[i])) {
654 ret = PTR_ERR(vqs[i]);
661 * We need a data area under 2G to communicate. Our payload is
662 * the address of the indicators.
664 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
667 *indicatorp = (unsigned long) &vcdev->indicators;
668 if (vcdev->is_thinint) {
669 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
671 /* no error, just fall back to legacy interrupts */
672 vcdev->is_thinint = false;
674 if (!vcdev->is_thinint) {
675 /* Register queue indicators with host. */
676 vcdev->indicators = 0;
677 ccw->cmd_code = CCW_CMD_SET_IND;
679 ccw->count = sizeof(&vcdev->indicators);
680 ccw->cda = (__u32)(unsigned long) indicatorp;
681 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
685 /* Register indicators2 with host for config changes */
686 *indicatorp = (unsigned long) &vcdev->indicators2;
687 vcdev->indicators2 = 0;
688 ccw->cmd_code = CCW_CMD_SET_CONF_IND;
690 ccw->count = sizeof(&vcdev->indicators2);
691 ccw->cda = (__u32)(unsigned long) indicatorp;
692 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
702 virtio_ccw_del_vqs(vdev);
706 static void virtio_ccw_reset(struct virtio_device *vdev)
708 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
711 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
715 /* Zero status bits. */
718 /* Send a reset ccw on device. */
719 ccw->cmd_code = CCW_CMD_VDEV_RESET;
723 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
727 static u64 virtio_ccw_get_features(struct virtio_device *vdev)
729 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
730 struct virtio_feature_desc *features;
735 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
739 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
744 /* Read the feature bits from the host. */
746 ccw->cmd_code = CCW_CMD_READ_FEAT;
748 ccw->count = sizeof(*features);
749 ccw->cda = (__u32)(unsigned long)features;
750 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
756 rc = le32_to_cpu(features->features);
758 if (vcdev->revision == 0)
761 /* Read second half of the feature bits from the host. */
763 ccw->cmd_code = CCW_CMD_READ_FEAT;
765 ccw->count = sizeof(*features);
766 ccw->cda = (__u32)(unsigned long)features;
767 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
769 rc |= (u64)le32_to_cpu(features->features) << 32;
777 static int virtio_ccw_finalize_features(struct virtio_device *vdev)
779 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
780 struct virtio_feature_desc *features;
784 if (vcdev->revision >= 1 &&
785 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
786 dev_err(&vdev->dev, "virtio: device uses revision 1 "
787 "but does not have VIRTIO_F_VERSION_1\n");
791 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
795 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
800 /* Give virtio_ring a chance to accept features. */
801 vring_transport_features(vdev);
804 features->features = cpu_to_le32((u32)vdev->features);
805 /* Write the first half of the feature bits to the host. */
806 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
808 ccw->count = sizeof(*features);
809 ccw->cda = (__u32)(unsigned long)features;
810 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
814 if (vcdev->revision == 0)
818 features->features = cpu_to_le32(vdev->features >> 32);
819 /* Write the second half of the feature bits to the host. */
820 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
822 ccw->count = sizeof(*features);
823 ccw->cda = (__u32)(unsigned long)features;
824 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
833 static void virtio_ccw_get_config(struct virtio_device *vdev,
834 unsigned int offset, void *buf, unsigned len)
836 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
842 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
846 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
850 /* Read the config area from the host. */
851 ccw->cmd_code = CCW_CMD_READ_CONF;
853 ccw->count = offset + len;
854 ccw->cda = (__u32)(unsigned long)config_area;
855 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
859 spin_lock_irqsave(&vcdev->lock, flags);
860 memcpy(vcdev->config, config_area, offset + len);
861 if (vcdev->config_ready < offset + len)
862 vcdev->config_ready = offset + len;
863 spin_unlock_irqrestore(&vcdev->lock, flags);
865 memcpy(buf, config_area + offset, len);
872 static void virtio_ccw_set_config(struct virtio_device *vdev,
873 unsigned int offset, const void *buf,
876 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
881 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
885 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
889 /* Make sure we don't overwrite fields. */
890 if (vcdev->config_ready < offset)
891 virtio_ccw_get_config(vdev, 0, NULL, offset);
892 spin_lock_irqsave(&vcdev->lock, flags);
893 memcpy(&vcdev->config[offset], buf, len);
894 /* Write the config area to the host. */
895 memcpy(config_area, vcdev->config, sizeof(vcdev->config));
896 spin_unlock_irqrestore(&vcdev->lock, flags);
897 ccw->cmd_code = CCW_CMD_WRITE_CONF;
899 ccw->count = offset + len;
900 ccw->cda = (__u32)(unsigned long)config_area;
901 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
908 static u8 virtio_ccw_get_status(struct virtio_device *vdev)
910 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
911 u8 old_status = *vcdev->status;
914 if (vcdev->revision < 2)
915 return *vcdev->status;
917 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
921 ccw->cmd_code = CCW_CMD_READ_STATUS;
923 ccw->count = sizeof(*vcdev->status);
924 ccw->cda = (__u32)(unsigned long)vcdev->status;
925 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS);
927 * If the channel program failed (should only happen if the device
928 * was hotunplugged, and then we clean up via the machine check
929 * handler anyway), vcdev->status was not overwritten and we just
930 * return the old status, which is fine.
934 return *vcdev->status;
937 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
939 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
940 u8 old_status = *vcdev->status;
944 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
948 /* Write the status to the host. */
949 *vcdev->status = status;
950 ccw->cmd_code = CCW_CMD_WRITE_STATUS;
952 ccw->count = sizeof(status);
953 ccw->cda = (__u32)(unsigned long)vcdev->status;
954 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
955 /* Write failed? We assume status is unchanged. */
957 *vcdev->status = old_status;
961 static const struct virtio_config_ops virtio_ccw_config_ops = {
962 .get_features = virtio_ccw_get_features,
963 .finalize_features = virtio_ccw_finalize_features,
964 .get = virtio_ccw_get_config,
965 .set = virtio_ccw_set_config,
966 .get_status = virtio_ccw_get_status,
967 .set_status = virtio_ccw_set_status,
968 .reset = virtio_ccw_reset,
969 .find_vqs = virtio_ccw_find_vqs,
970 .del_vqs = virtio_ccw_del_vqs,
975 * ccw bus driver related functions
978 static void virtio_ccw_release_dev(struct device *_d)
980 struct virtio_device *dev = dev_to_virtio(_d);
981 struct virtio_ccw_device *vcdev = to_vc_device(dev);
983 kfree(vcdev->status);
984 kfree(vcdev->config_block);
988 static int irb_is_error(struct irb *irb)
990 if (scsw_cstat(&irb->scsw) != 0)
992 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
994 if (scsw_cc(&irb->scsw) != 0)
999 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
1002 struct virtio_ccw_vq_info *info;
1003 unsigned long flags;
1004 struct virtqueue *vq;
1007 spin_lock_irqsave(&vcdev->lock, flags);
1008 list_for_each_entry(info, &vcdev->virtqueues, node) {
1009 if (info->vq->index == index) {
1014 spin_unlock_irqrestore(&vcdev->lock, flags);
1018 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev,
1021 if (vcdev->curr_io & activity) {
1023 case VIRTIO_CCW_DOING_READ_FEAT:
1024 case VIRTIO_CCW_DOING_WRITE_FEAT:
1025 case VIRTIO_CCW_DOING_READ_CONFIG:
1026 case VIRTIO_CCW_DOING_WRITE_CONFIG:
1027 case VIRTIO_CCW_DOING_WRITE_STATUS:
1028 case VIRTIO_CCW_DOING_READ_STATUS:
1029 case VIRTIO_CCW_DOING_SET_VQ:
1030 case VIRTIO_CCW_DOING_SET_IND:
1031 case VIRTIO_CCW_DOING_SET_CONF_IND:
1032 case VIRTIO_CCW_DOING_RESET:
1033 case VIRTIO_CCW_DOING_READ_VQ_CONF:
1034 case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
1035 case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
1036 vcdev->curr_io &= ~activity;
1037 wake_up(&vcdev->wait_q);
1040 /* don't know what to do... */
1041 dev_warn(&vcdev->cdev->dev,
1042 "Suspicious activity '%08x'\n", activity);
1049 static void virtio_ccw_int_handler(struct ccw_device *cdev,
1050 unsigned long intparm,
1053 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
1054 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1056 struct virtqueue *vq;
1061 vcdev->err = PTR_ERR(irb);
1062 virtio_ccw_check_activity(vcdev, activity);
1063 /* Don't poke around indicators, something's wrong. */
1066 /* Check if it's a notification from the host. */
1067 if ((intparm == 0) &&
1068 (scsw_stctl(&irb->scsw) ==
1069 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
1072 if (irb_is_error(irb)) {
1073 /* Command reject? */
1074 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1075 (irb->ecw[0] & SNS0_CMD_REJECT))
1076 vcdev->err = -EOPNOTSUPP;
1078 /* Map everything else to -EIO. */
1081 virtio_ccw_check_activity(vcdev, activity);
1082 for_each_set_bit(i, &vcdev->indicators,
1083 sizeof(vcdev->indicators) * BITS_PER_BYTE) {
1084 /* The bit clear must happen before the vring kick. */
1085 clear_bit(i, &vcdev->indicators);
1087 vq = virtio_ccw_vq_by_ind(vcdev, i);
1088 vring_interrupt(0, vq);
1090 if (test_bit(0, &vcdev->indicators2)) {
1091 virtio_config_changed(&vcdev->vdev);
1092 clear_bit(0, &vcdev->indicators2);
1097 * We usually want to autoonline all devices, but give the admin
1098 * a way to exempt devices from this.
1100 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1102 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
1104 static char *no_auto = "";
1106 module_param(no_auto, charp, 0444);
1107 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
1109 static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
1111 struct ccw_dev_id id;
1113 ccw_device_get_id(cdev, &id);
1114 if (test_bit(id.devno, devs_no_auto[id.ssid]))
1119 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
1121 struct ccw_device *cdev = data;
1124 ret = ccw_device_set_online(cdev);
1126 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
1129 static int virtio_ccw_probe(struct ccw_device *cdev)
1131 cdev->handler = virtio_ccw_int_handler;
1133 if (virtio_ccw_check_autoonline(cdev))
1134 async_schedule(virtio_ccw_auto_online, cdev);
1138 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
1140 unsigned long flags;
1141 struct virtio_ccw_device *vcdev;
1143 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1144 vcdev = dev_get_drvdata(&cdev->dev);
1145 if (!vcdev || vcdev->going_away) {
1146 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1149 vcdev->going_away = true;
1150 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1154 static void virtio_ccw_remove(struct ccw_device *cdev)
1156 unsigned long flags;
1157 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1159 if (vcdev && cdev->online) {
1160 if (vcdev->device_lost)
1161 virtio_break_device(&vcdev->vdev);
1162 unregister_virtio_device(&vcdev->vdev);
1163 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1164 dev_set_drvdata(&cdev->dev, NULL);
1165 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1167 cdev->handler = NULL;
1170 static int virtio_ccw_offline(struct ccw_device *cdev)
1172 unsigned long flags;
1173 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1177 if (vcdev->device_lost)
1178 virtio_break_device(&vcdev->vdev);
1179 unregister_virtio_device(&vcdev->vdev);
1180 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1181 dev_set_drvdata(&cdev->dev, NULL);
1182 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1186 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
1188 struct virtio_rev_info *rev;
1192 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
1195 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
1201 /* Set transport revision */
1202 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
1204 ccw->count = sizeof(*rev);
1205 ccw->cda = (__u32)(unsigned long)rev;
1207 vcdev->revision = VIRTIO_CCW_REV_MAX;
1209 rev->revision = vcdev->revision;
1210 /* none of our supported revisions carry payload */
1212 ret = ccw_io_helper(vcdev, ccw,
1213 VIRTIO_CCW_DOING_SET_VIRTIO_REV);
1214 if (ret == -EOPNOTSUPP) {
1215 if (vcdev->revision == 0)
1217 * The host device does not support setting
1218 * the revision: let's operate it in legacy
1225 } while (ret == -EOPNOTSUPP);
1232 static int virtio_ccw_online(struct ccw_device *cdev)
1235 struct virtio_ccw_device *vcdev;
1236 unsigned long flags;
1238 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
1240 dev_warn(&cdev->dev, "Could not get memory for virtio\n");
1244 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
1245 GFP_DMA | GFP_KERNEL);
1246 if (!vcdev->config_block) {
1250 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL);
1251 if (!vcdev->status) {
1256 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
1258 vcdev->vdev.dev.parent = &cdev->dev;
1259 vcdev->vdev.dev.release = virtio_ccw_release_dev;
1260 vcdev->vdev.config = &virtio_ccw_config_ops;
1262 init_waitqueue_head(&vcdev->wait_q);
1263 INIT_LIST_HEAD(&vcdev->virtqueues);
1264 spin_lock_init(&vcdev->lock);
1265 mutex_init(&vcdev->io_lock);
1267 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1268 dev_set_drvdata(&cdev->dev, vcdev);
1269 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1270 vcdev->vdev.id.vendor = cdev->id.cu_type;
1271 vcdev->vdev.id.device = cdev->id.cu_model;
1273 ret = virtio_ccw_set_transport_rev(vcdev);
1277 ret = register_virtio_device(&vcdev->vdev);
1279 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
1285 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1286 dev_set_drvdata(&cdev->dev, NULL);
1287 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1288 put_device(&vcdev->vdev.dev);
1292 kfree(vcdev->status);
1293 kfree(vcdev->config_block);
1299 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
1302 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1305 * Make sure vcdev is set
1306 * i.e. set_offline/remove callback not already running
1313 vcdev->device_lost = true;
1323 static struct ccw_device_id virtio_ids[] = {
1324 { CCW_DEVICE(0x3832, 0) },
1328 static struct ccw_driver virtio_ccw_driver = {
1330 .owner = THIS_MODULE,
1331 .name = "virtio_ccw",
1334 .probe = virtio_ccw_probe,
1335 .remove = virtio_ccw_remove,
1336 .set_offline = virtio_ccw_offline,
1337 .set_online = virtio_ccw_online,
1338 .notify = virtio_ccw_cio_notify,
1339 .int_class = IRQIO_VIR,
1342 static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
1343 int max_digit, int max_val)
1350 while (diff <= max_digit) {
1351 int value = hex_to_bin(**cp);
1355 *val = *val * 16 + value;
1360 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
1366 static int __init parse_busid(char *str, unsigned int *cssid,
1367 unsigned int *ssid, unsigned int *devno)
1378 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
1379 if (ret || (str_work[0] != '.'))
1382 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
1383 if (ret || (str_work[0] != '.'))
1386 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
1387 if (ret || (str_work[0] != '\0'))
1395 static void __init no_auto_parse(void)
1397 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
1402 while ((parm = strsep(&str, ","))) {
1403 rc = parse_busid(strsep(&parm, "-"), &from_cssid,
1408 rc = parse_busid(parm, &to_cssid,
1410 if ((from_ssid > to_ssid) ||
1411 ((from_ssid == to_ssid) && (from > to)))
1414 to_cssid = from_cssid;
1415 to_ssid = from_ssid;
1420 while ((from_ssid < to_ssid) ||
1421 ((from_ssid == to_ssid) && (from <= to))) {
1422 set_bit(from, devs_no_auto[from_ssid]);
1424 if (from > __MAX_SUBCHANNEL) {
1432 static int __init virtio_ccw_init(void)
1434 /* parse no_auto string before we do anything further */
1436 return ccw_driver_register(&virtio_ccw_driver);
1438 device_initcall(virtio_ccw_init);