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 list_head virtqueues;
63 unsigned long indicators;
64 unsigned long indicators2;
65 struct vq_config_block *config_block;
69 unsigned int config_ready;
73 struct vq_info_block_legacy {
80 struct vq_info_block {
89 struct virtio_feature_desc {
94 struct virtio_thinint_area {
95 unsigned long summary_indicator;
96 unsigned long indicator;
101 struct virtio_rev_info {
107 /* the highest virtio-ccw revision we support */
108 #define VIRTIO_CCW_REV_MAX 1
110 struct virtio_ccw_vq_info {
111 struct virtqueue *vq;
115 struct vq_info_block s;
116 struct vq_info_block_legacy l;
119 struct list_head node;
123 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */
125 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8)
126 #define MAX_AIRQ_AREAS 20
128 static int virtio_ccw_use_airq = 1;
132 u8 summary_indicator;
133 struct airq_struct airq;
136 static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
138 #define CCW_CMD_SET_VQ 0x13
139 #define CCW_CMD_VDEV_RESET 0x33
140 #define CCW_CMD_SET_IND 0x43
141 #define CCW_CMD_SET_CONF_IND 0x53
142 #define CCW_CMD_READ_FEAT 0x12
143 #define CCW_CMD_WRITE_FEAT 0x11
144 #define CCW_CMD_READ_CONF 0x22
145 #define CCW_CMD_WRITE_CONF 0x21
146 #define CCW_CMD_WRITE_STATUS 0x31
147 #define CCW_CMD_READ_VQ_CONF 0x32
148 #define CCW_CMD_READ_STATUS 0x72
149 #define CCW_CMD_SET_IND_ADAPTER 0x73
150 #define CCW_CMD_SET_VIRTIO_REV 0x83
152 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000
153 #define VIRTIO_CCW_DOING_RESET 0x00040000
154 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000
155 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000
156 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000
157 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000
158 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000
159 #define VIRTIO_CCW_DOING_SET_IND 0x01000000
160 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
161 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
162 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000
163 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
164 #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000
165 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000
167 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
169 return container_of(vdev, struct virtio_ccw_device, vdev);
172 static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info)
174 unsigned long i, flags;
176 write_lock_irqsave(&info->lock, flags);
177 for (i = 0; i < airq_iv_end(info->aiv); i++) {
178 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) {
179 airq_iv_free_bit(info->aiv, i);
180 airq_iv_set_ptr(info->aiv, i, 0);
184 write_unlock_irqrestore(&info->lock, flags);
187 static void virtio_airq_handler(struct airq_struct *airq)
189 struct airq_info *info = container_of(airq, struct airq_info, airq);
192 inc_irq_stat(IRQIO_VAI);
193 read_lock(&info->lock);
194 /* Walk through indicators field, summary indicator active. */
196 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
199 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
201 info->summary_indicator = 0;
203 /* Walk through indicators field, summary indicator not active. */
205 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
208 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
210 read_unlock(&info->lock);
213 static struct airq_info *new_airq_info(void)
215 struct airq_info *info;
218 info = kzalloc(sizeof(*info), GFP_KERNEL);
221 rwlock_init(&info->lock);
222 info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR);
227 info->airq.handler = virtio_airq_handler;
228 info->airq.lsi_ptr = &info->summary_indicator;
229 info->airq.lsi_mask = 0xff;
230 info->airq.isc = VIRTIO_AIRQ_ISC;
231 rc = register_adapter_interrupt(&info->airq);
233 airq_iv_release(info->aiv);
240 static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs,
241 u64 *first, void **airq_info)
244 struct airq_info *info;
245 unsigned long indicator_addr = 0;
246 unsigned long bit, flags;
248 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) {
250 airq_areas[i] = new_airq_info();
251 info = airq_areas[i];
254 write_lock_irqsave(&info->lock, flags);
255 bit = airq_iv_alloc(info->aiv, nvqs);
257 /* Not enough vacancies. */
258 write_unlock_irqrestore(&info->lock, flags);
263 indicator_addr = (unsigned long)info->aiv->vector;
264 for (j = 0; j < nvqs; j++) {
265 airq_iv_set_ptr(info->aiv, bit + j,
266 (unsigned long)vqs[j]);
268 write_unlock_irqrestore(&info->lock, flags);
270 return indicator_addr;
273 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev)
275 struct virtio_ccw_vq_info *info;
277 list_for_each_entry(info, &vcdev->virtqueues, node)
278 drop_airq_indicator(info->vq, vcdev->airq_info);
281 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag)
286 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
290 ret = vcdev->curr_io & flag;
291 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
295 static int ccw_io_helper(struct virtio_ccw_device *vcdev,
296 struct ccw1 *ccw, __u32 intparm)
300 int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
303 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
304 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
308 vcdev->curr_io |= flag;
310 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
312 } while (ret == -EBUSY);
313 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
314 return ret ? ret : vcdev->err;
317 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
321 unsigned long *indicatorp = NULL;
322 struct virtio_thinint_area *thinint_area = NULL;
323 struct airq_info *airq_info = vcdev->airq_info;
325 if (vcdev->is_thinint) {
326 thinint_area = kzalloc(sizeof(*thinint_area),
327 GFP_DMA | GFP_KERNEL);
330 thinint_area->summary_indicator =
331 (unsigned long) &airq_info->summary_indicator;
332 thinint_area->isc = VIRTIO_AIRQ_ISC;
333 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
334 ccw->count = sizeof(*thinint_area);
335 ccw->cda = (__u32)(unsigned long) thinint_area;
337 /* payload is the address of the indicators */
338 indicatorp = kmalloc(sizeof(&vcdev->indicators),
339 GFP_DMA | GFP_KERNEL);
343 ccw->cmd_code = CCW_CMD_SET_IND;
344 ccw->count = sizeof(&vcdev->indicators);
345 ccw->cda = (__u32)(unsigned long) indicatorp;
347 /* Deregister indicators from host. */
348 vcdev->indicators = 0;
350 ret = ccw_io_helper(vcdev, ccw,
352 VIRTIO_CCW_DOING_SET_IND_ADAPTER :
353 VIRTIO_CCW_DOING_SET_IND);
354 if (ret && (ret != -ENODEV))
355 dev_info(&vcdev->cdev->dev,
356 "Failed to deregister indicators (%d)\n", ret);
357 else if (vcdev->is_thinint)
358 virtio_ccw_drop_indicators(vcdev);
363 static inline long __do_kvm_notify(struct subchannel_id schid,
364 unsigned long queue_index,
367 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
368 register struct subchannel_id __schid asm("2") = schid;
369 register unsigned long __index asm("3") = queue_index;
370 register long __rc asm("2");
371 register long __cookie asm("4") = cookie;
373 asm volatile ("diag 2,4,0x500\n"
374 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index),
380 static inline long do_kvm_notify(struct subchannel_id schid,
381 unsigned long queue_index,
384 diag_stat_inc(DIAG_STAT_X500);
385 return __do_kvm_notify(schid, queue_index, cookie);
388 static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
390 struct virtio_ccw_vq_info *info = vq->priv;
391 struct virtio_ccw_device *vcdev;
392 struct subchannel_id schid;
394 vcdev = to_vc_device(info->vq->vdev);
395 ccw_device_get_schid(vcdev->cdev, &schid);
396 info->cookie = do_kvm_notify(schid, vq->index, info->cookie);
397 if (info->cookie < 0)
402 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
403 struct ccw1 *ccw, int index)
407 vcdev->config_block->index = index;
408 ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
410 ccw->count = sizeof(struct vq_config_block);
411 ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
412 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
415 return vcdev->config_block->num;
418 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
420 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
421 struct virtio_ccw_vq_info *info = vq->priv;
425 unsigned int index = vq->index;
427 /* Remove from our list. */
428 spin_lock_irqsave(&vcdev->lock, flags);
429 list_del(&info->node);
430 spin_unlock_irqrestore(&vcdev->lock, flags);
432 /* Release from host. */
433 if (vcdev->revision == 0) {
434 info->info_block->l.queue = 0;
435 info->info_block->l.align = 0;
436 info->info_block->l.index = index;
437 info->info_block->l.num = 0;
438 ccw->count = sizeof(info->info_block->l);
440 info->info_block->s.desc = 0;
441 info->info_block->s.index = index;
442 info->info_block->s.num = 0;
443 info->info_block->s.avail = 0;
444 info->info_block->s.used = 0;
445 ccw->count = sizeof(info->info_block->s);
447 ccw->cmd_code = CCW_CMD_SET_VQ;
449 ccw->cda = (__u32)(unsigned long)(info->info_block);
450 ret = ccw_io_helper(vcdev, ccw,
451 VIRTIO_CCW_DOING_SET_VQ | index);
453 * -ENODEV isn't considered an error: The device is gone anyway.
454 * This may happen on device detach.
456 if (ret && (ret != -ENODEV))
457 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n",
460 vring_del_virtqueue(vq);
461 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
462 free_pages_exact(info->queue, size);
463 kfree(info->info_block);
467 static void virtio_ccw_del_vqs(struct virtio_device *vdev)
469 struct virtqueue *vq, *n;
471 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
473 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
477 virtio_ccw_drop_indicator(vcdev, ccw);
479 list_for_each_entry_safe(vq, n, &vdev->vqs, list)
480 virtio_ccw_del_vq(vq, ccw);
485 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
486 int i, vq_callback_t *callback,
490 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
492 struct virtqueue *vq = NULL;
493 struct virtio_ccw_vq_info *info;
494 unsigned long size = 0; /* silence the compiler */
497 /* Allocate queue. */
498 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
500 dev_warn(&vcdev->cdev->dev, "no info\n");
504 info->info_block = kzalloc(sizeof(*info->info_block),
505 GFP_DMA | GFP_KERNEL);
506 if (!info->info_block) {
507 dev_warn(&vcdev->cdev->dev, "no info block\n");
511 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
516 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
517 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
518 if (info->queue == NULL) {
519 dev_warn(&vcdev->cdev->dev, "no queue\n");
524 vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
525 true, info->queue, virtio_ccw_kvm_notify,
528 /* For now, we fail if we can't get the requested size. */
529 dev_warn(&vcdev->cdev->dev, "no vq\n");
534 /* Register it with the host. */
535 if (vcdev->revision == 0) {
536 info->info_block->l.queue = (__u64)info->queue;
537 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
538 info->info_block->l.index = i;
539 info->info_block->l.num = info->num;
540 ccw->count = sizeof(info->info_block->l);
542 info->info_block->s.desc = (__u64)info->queue;
543 info->info_block->s.index = i;
544 info->info_block->s.num = info->num;
545 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);
546 info->info_block->s.used = (__u64)virtqueue_get_used(vq);
547 ccw->count = sizeof(info->info_block->s);
549 ccw->cmd_code = CCW_CMD_SET_VQ;
551 ccw->cda = (__u32)(unsigned long)(info->info_block);
552 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
554 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
561 /* Save it to our list. */
562 spin_lock_irqsave(&vcdev->lock, flags);
563 list_add(&info->node, &vcdev->virtqueues);
564 spin_unlock_irqrestore(&vcdev->lock, flags);
570 vring_del_virtqueue(vq);
573 free_pages_exact(info->queue, size);
574 kfree(info->info_block);
580 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
581 struct virtqueue *vqs[], int nvqs,
585 struct virtio_thinint_area *thinint_area = NULL;
586 struct airq_info *info;
588 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL);
593 /* Try to get an indicator. */
594 thinint_area->indicator = get_airq_indicator(vqs, nvqs,
595 &thinint_area->bit_nr,
597 if (!thinint_area->indicator) {
601 info = vcdev->airq_info;
602 thinint_area->summary_indicator =
603 (unsigned long) &info->summary_indicator;
604 thinint_area->isc = VIRTIO_AIRQ_ISC;
605 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
606 ccw->flags = CCW_FLAG_SLI;
607 ccw->count = sizeof(*thinint_area);
608 ccw->cda = (__u32)(unsigned long)thinint_area;
609 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
611 if (ret == -EOPNOTSUPP) {
613 * The host does not support adapter interrupts
614 * for virtio-ccw, stop trying.
616 virtio_ccw_use_airq = 0;
617 pr_info("Adapter interrupts unsupported on host\n");
619 dev_warn(&vcdev->cdev->dev,
620 "enabling adapter interrupts = %d\n", ret);
621 virtio_ccw_drop_indicators(vcdev);
628 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
629 struct virtqueue *vqs[],
630 vq_callback_t *callbacks[],
631 const char * const names[])
633 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
634 unsigned long *indicatorp = NULL;
638 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
642 for (i = 0; i < nvqs; ++i) {
643 vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i],
645 if (IS_ERR(vqs[i])) {
646 ret = PTR_ERR(vqs[i]);
653 * We need a data area under 2G to communicate. Our payload is
654 * the address of the indicators.
656 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
659 *indicatorp = (unsigned long) &vcdev->indicators;
660 if (vcdev->is_thinint) {
661 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
663 /* no error, just fall back to legacy interrupts */
664 vcdev->is_thinint = 0;
666 if (!vcdev->is_thinint) {
667 /* Register queue indicators with host. */
668 vcdev->indicators = 0;
669 ccw->cmd_code = CCW_CMD_SET_IND;
671 ccw->count = sizeof(&vcdev->indicators);
672 ccw->cda = (__u32)(unsigned long) indicatorp;
673 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
677 /* Register indicators2 with host for config changes */
678 *indicatorp = (unsigned long) &vcdev->indicators2;
679 vcdev->indicators2 = 0;
680 ccw->cmd_code = CCW_CMD_SET_CONF_IND;
682 ccw->count = sizeof(&vcdev->indicators2);
683 ccw->cda = (__u32)(unsigned long) indicatorp;
684 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
694 virtio_ccw_del_vqs(vdev);
698 static void virtio_ccw_reset(struct virtio_device *vdev)
700 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
703 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
707 /* Zero status bits. */
710 /* Send a reset ccw on device. */
711 ccw->cmd_code = CCW_CMD_VDEV_RESET;
715 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
719 static u64 virtio_ccw_get_features(struct virtio_device *vdev)
721 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
722 struct virtio_feature_desc *features;
727 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
731 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
736 /* Read the feature bits from the host. */
738 ccw->cmd_code = CCW_CMD_READ_FEAT;
740 ccw->count = sizeof(*features);
741 ccw->cda = (__u32)(unsigned long)features;
742 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
748 rc = le32_to_cpu(features->features);
750 if (vcdev->revision == 0)
753 /* Read second half of the feature bits from the host. */
755 ccw->cmd_code = CCW_CMD_READ_FEAT;
757 ccw->count = sizeof(*features);
758 ccw->cda = (__u32)(unsigned long)features;
759 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
761 rc |= (u64)le32_to_cpu(features->features) << 32;
769 static int virtio_ccw_finalize_features(struct virtio_device *vdev)
771 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
772 struct virtio_feature_desc *features;
776 if (vcdev->revision >= 1 &&
777 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
778 dev_err(&vdev->dev, "virtio: device uses revision 1 "
779 "but does not have VIRTIO_F_VERSION_1\n");
783 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
787 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
792 /* Give virtio_ring a chance to accept features. */
793 vring_transport_features(vdev);
796 features->features = cpu_to_le32((u32)vdev->features);
797 /* Write the first half of the feature bits to the host. */
798 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
800 ccw->count = sizeof(*features);
801 ccw->cda = (__u32)(unsigned long)features;
802 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
806 if (vcdev->revision == 0)
810 features->features = cpu_to_le32(vdev->features >> 32);
811 /* Write the second half of the feature bits to the host. */
812 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
814 ccw->count = sizeof(*features);
815 ccw->cda = (__u32)(unsigned long)features;
816 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
825 static void virtio_ccw_get_config(struct virtio_device *vdev,
826 unsigned int offset, void *buf, unsigned len)
828 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
833 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
837 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
841 /* Read the config area from the host. */
842 ccw->cmd_code = CCW_CMD_READ_CONF;
844 ccw->count = offset + len;
845 ccw->cda = (__u32)(unsigned long)config_area;
846 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
850 memcpy(vcdev->config, config_area, offset + len);
852 memcpy(buf, &vcdev->config[offset], len);
853 if (vcdev->config_ready < offset + len)
854 vcdev->config_ready = offset + len;
861 static void virtio_ccw_set_config(struct virtio_device *vdev,
862 unsigned int offset, const void *buf,
865 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
869 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
873 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
877 /* Make sure we don't overwrite fields. */
878 if (vcdev->config_ready < offset)
879 virtio_ccw_get_config(vdev, 0, NULL, offset);
880 memcpy(&vcdev->config[offset], buf, len);
881 /* Write the config area to the host. */
882 memcpy(config_area, vcdev->config, sizeof(vcdev->config));
883 ccw->cmd_code = CCW_CMD_WRITE_CONF;
885 ccw->count = offset + len;
886 ccw->cda = (__u32)(unsigned long)config_area;
887 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
894 static u8 virtio_ccw_get_status(struct virtio_device *vdev)
896 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
897 u8 old_status = *vcdev->status;
900 if (vcdev->revision < 1)
901 return *vcdev->status;
903 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
907 ccw->cmd_code = CCW_CMD_READ_STATUS;
909 ccw->count = sizeof(*vcdev->status);
910 ccw->cda = (__u32)(unsigned long)vcdev->status;
911 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS);
913 * If the channel program failed (should only happen if the device
914 * was hotunplugged, and then we clean up via the machine check
915 * handler anyway), vcdev->status was not overwritten and we just
916 * return the old status, which is fine.
920 return *vcdev->status;
923 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
925 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
926 u8 old_status = *vcdev->status;
930 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
934 /* Write the status to the host. */
935 *vcdev->status = status;
936 ccw->cmd_code = CCW_CMD_WRITE_STATUS;
938 ccw->count = sizeof(status);
939 ccw->cda = (__u32)(unsigned long)vcdev->status;
940 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
941 /* Write failed? We assume status is unchanged. */
943 *vcdev->status = old_status;
947 static const struct virtio_config_ops virtio_ccw_config_ops = {
948 .get_features = virtio_ccw_get_features,
949 .finalize_features = virtio_ccw_finalize_features,
950 .get = virtio_ccw_get_config,
951 .set = virtio_ccw_set_config,
952 .get_status = virtio_ccw_get_status,
953 .set_status = virtio_ccw_set_status,
954 .reset = virtio_ccw_reset,
955 .find_vqs = virtio_ccw_find_vqs,
956 .del_vqs = virtio_ccw_del_vqs,
961 * ccw bus driver related functions
964 static void virtio_ccw_release_dev(struct device *_d)
966 struct virtio_device *dev = dev_to_virtio(_d);
967 struct virtio_ccw_device *vcdev = to_vc_device(dev);
969 kfree(vcdev->status);
970 kfree(vcdev->config_block);
974 static int irb_is_error(struct irb *irb)
976 if (scsw_cstat(&irb->scsw) != 0)
978 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
980 if (scsw_cc(&irb->scsw) != 0)
985 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
988 struct virtio_ccw_vq_info *info;
990 struct virtqueue *vq;
993 spin_lock_irqsave(&vcdev->lock, flags);
994 list_for_each_entry(info, &vcdev->virtqueues, node) {
995 if (info->vq->index == index) {
1000 spin_unlock_irqrestore(&vcdev->lock, flags);
1004 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev,
1007 if (vcdev->curr_io & activity) {
1009 case VIRTIO_CCW_DOING_READ_FEAT:
1010 case VIRTIO_CCW_DOING_WRITE_FEAT:
1011 case VIRTIO_CCW_DOING_READ_CONFIG:
1012 case VIRTIO_CCW_DOING_WRITE_CONFIG:
1013 case VIRTIO_CCW_DOING_WRITE_STATUS:
1014 case VIRTIO_CCW_DOING_READ_STATUS:
1015 case VIRTIO_CCW_DOING_SET_VQ:
1016 case VIRTIO_CCW_DOING_SET_IND:
1017 case VIRTIO_CCW_DOING_SET_CONF_IND:
1018 case VIRTIO_CCW_DOING_RESET:
1019 case VIRTIO_CCW_DOING_READ_VQ_CONF:
1020 case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
1021 case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
1022 vcdev->curr_io &= ~activity;
1023 wake_up(&vcdev->wait_q);
1026 /* don't know what to do... */
1027 dev_warn(&vcdev->cdev->dev,
1028 "Suspicious activity '%08x'\n", activity);
1035 static void virtio_ccw_int_handler(struct ccw_device *cdev,
1036 unsigned long intparm,
1039 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
1040 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1042 struct virtqueue *vq;
1047 vcdev->err = PTR_ERR(irb);
1048 virtio_ccw_check_activity(vcdev, activity);
1049 /* Don't poke around indicators, something's wrong. */
1052 /* Check if it's a notification from the host. */
1053 if ((intparm == 0) &&
1054 (scsw_stctl(&irb->scsw) ==
1055 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
1058 if (irb_is_error(irb)) {
1059 /* Command reject? */
1060 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1061 (irb->ecw[0] & SNS0_CMD_REJECT))
1062 vcdev->err = -EOPNOTSUPP;
1064 /* Map everything else to -EIO. */
1067 virtio_ccw_check_activity(vcdev, activity);
1068 for_each_set_bit(i, &vcdev->indicators,
1069 sizeof(vcdev->indicators) * BITS_PER_BYTE) {
1070 /* The bit clear must happen before the vring kick. */
1071 clear_bit(i, &vcdev->indicators);
1073 vq = virtio_ccw_vq_by_ind(vcdev, i);
1074 vring_interrupt(0, vq);
1076 if (test_bit(0, &vcdev->indicators2)) {
1077 virtio_config_changed(&vcdev->vdev);
1078 clear_bit(0, &vcdev->indicators2);
1083 * We usually want to autoonline all devices, but give the admin
1084 * a way to exempt devices from this.
1086 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1088 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
1090 static char *no_auto = "";
1092 module_param(no_auto, charp, 0444);
1093 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
1095 static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
1097 struct ccw_dev_id id;
1099 ccw_device_get_id(cdev, &id);
1100 if (test_bit(id.devno, devs_no_auto[id.ssid]))
1105 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
1107 struct ccw_device *cdev = data;
1110 ret = ccw_device_set_online(cdev);
1112 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
1115 static int virtio_ccw_probe(struct ccw_device *cdev)
1117 cdev->handler = virtio_ccw_int_handler;
1119 if (virtio_ccw_check_autoonline(cdev))
1120 async_schedule(virtio_ccw_auto_online, cdev);
1124 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
1126 unsigned long flags;
1127 struct virtio_ccw_device *vcdev;
1129 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1130 vcdev = dev_get_drvdata(&cdev->dev);
1131 if (!vcdev || vcdev->going_away) {
1132 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1135 vcdev->going_away = true;
1136 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1140 static void virtio_ccw_remove(struct ccw_device *cdev)
1142 unsigned long flags;
1143 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1145 if (vcdev && cdev->online) {
1146 if (vcdev->device_lost)
1147 virtio_break_device(&vcdev->vdev);
1148 unregister_virtio_device(&vcdev->vdev);
1149 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1150 dev_set_drvdata(&cdev->dev, NULL);
1151 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1153 cdev->handler = NULL;
1156 static int virtio_ccw_offline(struct ccw_device *cdev)
1158 unsigned long flags;
1159 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1163 if (vcdev->device_lost)
1164 virtio_break_device(&vcdev->vdev);
1165 unregister_virtio_device(&vcdev->vdev);
1166 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1167 dev_set_drvdata(&cdev->dev, NULL);
1168 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1172 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
1174 struct virtio_rev_info *rev;
1178 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
1181 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
1187 /* Set transport revision */
1188 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
1190 ccw->count = sizeof(*rev);
1191 ccw->cda = (__u32)(unsigned long)rev;
1193 vcdev->revision = VIRTIO_CCW_REV_MAX;
1195 rev->revision = vcdev->revision;
1196 /* none of our supported revisions carry payload */
1198 ret = ccw_io_helper(vcdev, ccw,
1199 VIRTIO_CCW_DOING_SET_VIRTIO_REV);
1200 if (ret == -EOPNOTSUPP) {
1201 if (vcdev->revision == 0)
1203 * The host device does not support setting
1204 * the revision: let's operate it in legacy
1211 } while (ret == -EOPNOTSUPP);
1218 static int virtio_ccw_online(struct ccw_device *cdev)
1221 struct virtio_ccw_device *vcdev;
1222 unsigned long flags;
1224 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
1226 dev_warn(&cdev->dev, "Could not get memory for virtio\n");
1230 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
1231 GFP_DMA | GFP_KERNEL);
1232 if (!vcdev->config_block) {
1236 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL);
1237 if (!vcdev->status) {
1242 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
1244 vcdev->vdev.dev.parent = &cdev->dev;
1245 vcdev->vdev.dev.release = virtio_ccw_release_dev;
1246 vcdev->vdev.config = &virtio_ccw_config_ops;
1248 init_waitqueue_head(&vcdev->wait_q);
1249 INIT_LIST_HEAD(&vcdev->virtqueues);
1250 spin_lock_init(&vcdev->lock);
1252 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1253 dev_set_drvdata(&cdev->dev, vcdev);
1254 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1255 vcdev->vdev.id.vendor = cdev->id.cu_type;
1256 vcdev->vdev.id.device = cdev->id.cu_model;
1258 ret = virtio_ccw_set_transport_rev(vcdev);
1262 ret = register_virtio_device(&vcdev->vdev);
1264 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
1270 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1271 dev_set_drvdata(&cdev->dev, NULL);
1272 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1273 put_device(&vcdev->vdev.dev);
1277 kfree(vcdev->status);
1278 kfree(vcdev->config_block);
1284 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
1287 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1290 * Make sure vcdev is set
1291 * i.e. set_offline/remove callback not already running
1298 vcdev->device_lost = true;
1308 static struct ccw_device_id virtio_ids[] = {
1309 { CCW_DEVICE(0x3832, 0) },
1313 static struct ccw_driver virtio_ccw_driver = {
1315 .owner = THIS_MODULE,
1316 .name = "virtio_ccw",
1319 .probe = virtio_ccw_probe,
1320 .remove = virtio_ccw_remove,
1321 .set_offline = virtio_ccw_offline,
1322 .set_online = virtio_ccw_online,
1323 .notify = virtio_ccw_cio_notify,
1324 .int_class = IRQIO_VIR,
1327 static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
1328 int max_digit, int max_val)
1335 while (diff <= max_digit) {
1336 int value = hex_to_bin(**cp);
1340 *val = *val * 16 + value;
1345 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
1351 static int __init parse_busid(char *str, unsigned int *cssid,
1352 unsigned int *ssid, unsigned int *devno)
1363 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
1364 if (ret || (str_work[0] != '.'))
1367 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
1368 if (ret || (str_work[0] != '.'))
1371 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
1372 if (ret || (str_work[0] != '\0'))
1380 static void __init no_auto_parse(void)
1382 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
1387 while ((parm = strsep(&str, ","))) {
1388 rc = parse_busid(strsep(&parm, "-"), &from_cssid,
1393 rc = parse_busid(parm, &to_cssid,
1395 if ((from_ssid > to_ssid) ||
1396 ((from_ssid == to_ssid) && (from > to)))
1399 to_cssid = from_cssid;
1400 to_ssid = from_ssid;
1405 while ((from_ssid < to_ssid) ||
1406 ((from_ssid == to_ssid) && (from <= to))) {
1407 set_bit(from, devs_no_auto[from_ssid]);
1409 if (from > __MAX_SUBCHANNEL) {
1417 static int __init virtio_ccw_init(void)
1419 /* parse no_auto string before we do anything further */
1421 return ccw_driver_register(&virtio_ccw_driver);
1423 device_initcall(virtio_ccw_init);