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/module.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_SET_IND_ADAPTER 0x73
149 #define CCW_CMD_SET_VIRTIO_REV 0x83
151 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000
152 #define VIRTIO_CCW_DOING_RESET 0x00040000
153 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000
154 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000
155 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000
156 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000
157 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000
158 #define VIRTIO_CCW_DOING_SET_IND 0x01000000
159 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
160 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
161 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000
162 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
163 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000
165 static struct virtio_ccw_device
*to_vc_device(struct virtio_device
*vdev
)
167 return container_of(vdev
, struct virtio_ccw_device
, vdev
);
170 static void drop_airq_indicator(struct virtqueue
*vq
, struct airq_info
*info
)
172 unsigned long i
, flags
;
174 write_lock_irqsave(&info
->lock
, flags
);
175 for (i
= 0; i
< airq_iv_end(info
->aiv
); i
++) {
176 if (vq
== (void *)airq_iv_get_ptr(info
->aiv
, i
)) {
177 airq_iv_free_bit(info
->aiv
, i
);
178 airq_iv_set_ptr(info
->aiv
, i
, 0);
182 write_unlock_irqrestore(&info
->lock
, flags
);
185 static void virtio_airq_handler(struct airq_struct
*airq
)
187 struct airq_info
*info
= container_of(airq
, struct airq_info
, airq
);
190 inc_irq_stat(IRQIO_VAI
);
191 read_lock(&info
->lock
);
192 /* Walk through indicators field, summary indicator active. */
194 ai
= airq_iv_scan(info
->aiv
, ai
, airq_iv_end(info
->aiv
));
197 vring_interrupt(0, (void *)airq_iv_get_ptr(info
->aiv
, ai
));
199 info
->summary_indicator
= 0;
201 /* Walk through indicators field, summary indicator not active. */
203 ai
= airq_iv_scan(info
->aiv
, ai
, airq_iv_end(info
->aiv
));
206 vring_interrupt(0, (void *)airq_iv_get_ptr(info
->aiv
, ai
));
208 read_unlock(&info
->lock
);
211 static struct airq_info
*new_airq_info(void)
213 struct airq_info
*info
;
216 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
219 rwlock_init(&info
->lock
);
220 info
->aiv
= airq_iv_create(VIRTIO_IV_BITS
, AIRQ_IV_ALLOC
| AIRQ_IV_PTR
);
225 info
->airq
.handler
= virtio_airq_handler
;
226 info
->airq
.lsi_ptr
= &info
->summary_indicator
;
227 info
->airq
.lsi_mask
= 0xff;
228 info
->airq
.isc
= VIRTIO_AIRQ_ISC
;
229 rc
= register_adapter_interrupt(&info
->airq
);
231 airq_iv_release(info
->aiv
);
238 static void destroy_airq_info(struct airq_info
*info
)
243 unregister_adapter_interrupt(&info
->airq
);
244 airq_iv_release(info
->aiv
);
248 static unsigned long get_airq_indicator(struct virtqueue
*vqs
[], int nvqs
,
249 u64
*first
, void **airq_info
)
252 struct airq_info
*info
;
253 unsigned long indicator_addr
= 0;
254 unsigned long bit
, flags
;
256 for (i
= 0; i
< MAX_AIRQ_AREAS
&& !indicator_addr
; i
++) {
258 airq_areas
[i
] = new_airq_info();
259 info
= airq_areas
[i
];
262 write_lock_irqsave(&info
->lock
, flags
);
263 bit
= airq_iv_alloc(info
->aiv
, nvqs
);
265 /* Not enough vacancies. */
266 write_unlock_irqrestore(&info
->lock
, flags
);
271 indicator_addr
= (unsigned long)info
->aiv
->vector
;
272 for (j
= 0; j
< nvqs
; j
++) {
273 airq_iv_set_ptr(info
->aiv
, bit
+ j
,
274 (unsigned long)vqs
[j
]);
276 write_unlock_irqrestore(&info
->lock
, flags
);
278 return indicator_addr
;
281 static void virtio_ccw_drop_indicators(struct virtio_ccw_device
*vcdev
)
283 struct virtio_ccw_vq_info
*info
;
285 list_for_each_entry(info
, &vcdev
->virtqueues
, node
)
286 drop_airq_indicator(info
->vq
, vcdev
->airq_info
);
289 static int doing_io(struct virtio_ccw_device
*vcdev
, __u32 flag
)
294 spin_lock_irqsave(get_ccwdev_lock(vcdev
->cdev
), flags
);
298 ret
= vcdev
->curr_io
& flag
;
299 spin_unlock_irqrestore(get_ccwdev_lock(vcdev
->cdev
), flags
);
303 static int ccw_io_helper(struct virtio_ccw_device
*vcdev
,
304 struct ccw1
*ccw
, __u32 intparm
)
308 int flag
= intparm
& VIRTIO_CCW_INTPARM_MASK
;
311 spin_lock_irqsave(get_ccwdev_lock(vcdev
->cdev
), flags
);
312 ret
= ccw_device_start(vcdev
->cdev
, ccw
, intparm
, 0, 0);
316 vcdev
->curr_io
|= flag
;
318 spin_unlock_irqrestore(get_ccwdev_lock(vcdev
->cdev
), flags
);
320 } while (ret
== -EBUSY
);
321 wait_event(vcdev
->wait_q
, doing_io(vcdev
, flag
) == 0);
322 return ret
? ret
: vcdev
->err
;
325 static void virtio_ccw_drop_indicator(struct virtio_ccw_device
*vcdev
,
329 unsigned long *indicatorp
= NULL
;
330 struct virtio_thinint_area
*thinint_area
= NULL
;
331 struct airq_info
*airq_info
= vcdev
->airq_info
;
333 if (vcdev
->is_thinint
) {
334 thinint_area
= kzalloc(sizeof(*thinint_area
),
335 GFP_DMA
| GFP_KERNEL
);
338 thinint_area
->summary_indicator
=
339 (unsigned long) &airq_info
->summary_indicator
;
340 thinint_area
->isc
= VIRTIO_AIRQ_ISC
;
341 ccw
->cmd_code
= CCW_CMD_SET_IND_ADAPTER
;
342 ccw
->count
= sizeof(*thinint_area
);
343 ccw
->cda
= (__u32
)(unsigned long) thinint_area
;
345 indicatorp
= kmalloc(sizeof(&vcdev
->indicators
),
346 GFP_DMA
| GFP_KERNEL
);
350 ccw
->cmd_code
= CCW_CMD_SET_IND
;
351 ccw
->count
= sizeof(vcdev
->indicators
);
352 ccw
->cda
= (__u32
)(unsigned long) indicatorp
;
354 /* Deregister indicators from host. */
355 vcdev
->indicators
= 0;
357 ret
= ccw_io_helper(vcdev
, ccw
,
359 VIRTIO_CCW_DOING_SET_IND_ADAPTER
:
360 VIRTIO_CCW_DOING_SET_IND
);
361 if (ret
&& (ret
!= -ENODEV
))
362 dev_info(&vcdev
->cdev
->dev
,
363 "Failed to deregister indicators (%d)\n", ret
);
364 else if (vcdev
->is_thinint
)
365 virtio_ccw_drop_indicators(vcdev
);
370 static inline long __do_kvm_notify(struct subchannel_id schid
,
371 unsigned long queue_index
,
374 register unsigned long __nr
asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY
;
375 register struct subchannel_id __schid
asm("2") = schid
;
376 register unsigned long __index
asm("3") = queue_index
;
377 register long __rc
asm("2");
378 register long __cookie
asm("4") = cookie
;
380 asm volatile ("diag 2,4,0x500\n"
381 : "=d" (__rc
) : "d" (__nr
), "d" (__schid
), "d" (__index
),
387 static inline long do_kvm_notify(struct subchannel_id schid
,
388 unsigned long queue_index
,
391 diag_stat_inc(DIAG_STAT_X500
);
392 return __do_kvm_notify(schid
, queue_index
, cookie
);
395 static bool virtio_ccw_kvm_notify(struct virtqueue
*vq
)
397 struct virtio_ccw_vq_info
*info
= vq
->priv
;
398 struct virtio_ccw_device
*vcdev
;
399 struct subchannel_id schid
;
401 vcdev
= to_vc_device(info
->vq
->vdev
);
402 ccw_device_get_schid(vcdev
->cdev
, &schid
);
403 info
->cookie
= do_kvm_notify(schid
, vq
->index
, info
->cookie
);
404 if (info
->cookie
< 0)
409 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device
*vcdev
,
410 struct ccw1
*ccw
, int index
)
414 vcdev
->config_block
->index
= index
;
415 ccw
->cmd_code
= CCW_CMD_READ_VQ_CONF
;
417 ccw
->count
= sizeof(struct vq_config_block
);
418 ccw
->cda
= (__u32
)(unsigned long)(vcdev
->config_block
);
419 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_READ_VQ_CONF
);
422 return vcdev
->config_block
->num
;
425 static void virtio_ccw_del_vq(struct virtqueue
*vq
, struct ccw1
*ccw
)
427 struct virtio_ccw_device
*vcdev
= to_vc_device(vq
->vdev
);
428 struct virtio_ccw_vq_info
*info
= vq
->priv
;
432 unsigned int index
= vq
->index
;
434 /* Remove from our list. */
435 spin_lock_irqsave(&vcdev
->lock
, flags
);
436 list_del(&info
->node
);
437 spin_unlock_irqrestore(&vcdev
->lock
, flags
);
439 /* Release from host. */
440 if (vcdev
->revision
== 0) {
441 info
->info_block
->l
.queue
= 0;
442 info
->info_block
->l
.align
= 0;
443 info
->info_block
->l
.index
= index
;
444 info
->info_block
->l
.num
= 0;
445 ccw
->count
= sizeof(info
->info_block
->l
);
447 info
->info_block
->s
.desc
= 0;
448 info
->info_block
->s
.index
= index
;
449 info
->info_block
->s
.num
= 0;
450 info
->info_block
->s
.avail
= 0;
451 info
->info_block
->s
.used
= 0;
452 ccw
->count
= sizeof(info
->info_block
->s
);
454 ccw
->cmd_code
= CCW_CMD_SET_VQ
;
456 ccw
->cda
= (__u32
)(unsigned long)(info
->info_block
);
457 ret
= ccw_io_helper(vcdev
, ccw
,
458 VIRTIO_CCW_DOING_SET_VQ
| index
);
460 * -ENODEV isn't considered an error: The device is gone anyway.
461 * This may happen on device detach.
463 if (ret
&& (ret
!= -ENODEV
))
464 dev_warn(&vq
->vdev
->dev
, "Error %d while deleting queue %d",
467 vring_del_virtqueue(vq
);
468 size
= PAGE_ALIGN(vring_size(info
->num
, KVM_VIRTIO_CCW_RING_ALIGN
));
469 free_pages_exact(info
->queue
, size
);
470 kfree(info
->info_block
);
474 static void virtio_ccw_del_vqs(struct virtio_device
*vdev
)
476 struct virtqueue
*vq
, *n
;
478 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
480 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
484 virtio_ccw_drop_indicator(vcdev
, ccw
);
486 list_for_each_entry_safe(vq
, n
, &vdev
->vqs
, list
)
487 virtio_ccw_del_vq(vq
, ccw
);
492 static struct virtqueue
*virtio_ccw_setup_vq(struct virtio_device
*vdev
,
493 int i
, vq_callback_t
*callback
,
497 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
499 struct virtqueue
*vq
= NULL
;
500 struct virtio_ccw_vq_info
*info
;
501 unsigned long size
= 0; /* silence the compiler */
504 /* Allocate queue. */
505 info
= kzalloc(sizeof(struct virtio_ccw_vq_info
), GFP_KERNEL
);
507 dev_warn(&vcdev
->cdev
->dev
, "no info\n");
511 info
->info_block
= kzalloc(sizeof(*info
->info_block
),
512 GFP_DMA
| GFP_KERNEL
);
513 if (!info
->info_block
) {
514 dev_warn(&vcdev
->cdev
->dev
, "no info block\n");
518 info
->num
= virtio_ccw_read_vq_conf(vcdev
, ccw
, i
);
523 size
= PAGE_ALIGN(vring_size(info
->num
, KVM_VIRTIO_CCW_RING_ALIGN
));
524 info
->queue
= alloc_pages_exact(size
, GFP_KERNEL
| __GFP_ZERO
);
525 if (info
->queue
== NULL
) {
526 dev_warn(&vcdev
->cdev
->dev
, "no queue\n");
531 vq
= vring_new_virtqueue(i
, info
->num
, KVM_VIRTIO_CCW_RING_ALIGN
, vdev
,
532 true, info
->queue
, virtio_ccw_kvm_notify
,
535 /* For now, we fail if we can't get the requested size. */
536 dev_warn(&vcdev
->cdev
->dev
, "no vq\n");
541 /* Register it with the host. */
542 if (vcdev
->revision
== 0) {
543 info
->info_block
->l
.queue
= (__u64
)info
->queue
;
544 info
->info_block
->l
.align
= KVM_VIRTIO_CCW_RING_ALIGN
;
545 info
->info_block
->l
.index
= i
;
546 info
->info_block
->l
.num
= info
->num
;
547 ccw
->count
= sizeof(info
->info_block
->l
);
549 info
->info_block
->s
.desc
= (__u64
)info
->queue
;
550 info
->info_block
->s
.index
= i
;
551 info
->info_block
->s
.num
= info
->num
;
552 info
->info_block
->s
.avail
= (__u64
)virtqueue_get_avail(vq
);
553 info
->info_block
->s
.used
= (__u64
)virtqueue_get_used(vq
);
554 ccw
->count
= sizeof(info
->info_block
->s
);
556 ccw
->cmd_code
= CCW_CMD_SET_VQ
;
558 ccw
->cda
= (__u32
)(unsigned long)(info
->info_block
);
559 err
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_SET_VQ
| i
);
561 dev_warn(&vcdev
->cdev
->dev
, "SET_VQ failed\n");
568 /* Save it to our list. */
569 spin_lock_irqsave(&vcdev
->lock
, flags
);
570 list_add(&info
->node
, &vcdev
->virtqueues
);
571 spin_unlock_irqrestore(&vcdev
->lock
, flags
);
577 vring_del_virtqueue(vq
);
580 free_pages_exact(info
->queue
, size
);
581 kfree(info
->info_block
);
587 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device
*vcdev
,
588 struct virtqueue
*vqs
[], int nvqs
,
592 struct virtio_thinint_area
*thinint_area
= NULL
;
593 struct airq_info
*info
;
595 thinint_area
= kzalloc(sizeof(*thinint_area
), GFP_DMA
| GFP_KERNEL
);
600 /* Try to get an indicator. */
601 thinint_area
->indicator
= get_airq_indicator(vqs
, nvqs
,
602 &thinint_area
->bit_nr
,
604 if (!thinint_area
->indicator
) {
608 info
= vcdev
->airq_info
;
609 thinint_area
->summary_indicator
=
610 (unsigned long) &info
->summary_indicator
;
611 thinint_area
->isc
= VIRTIO_AIRQ_ISC
;
612 ccw
->cmd_code
= CCW_CMD_SET_IND_ADAPTER
;
613 ccw
->flags
= CCW_FLAG_SLI
;
614 ccw
->count
= sizeof(*thinint_area
);
615 ccw
->cda
= (__u32
)(unsigned long)thinint_area
;
616 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_SET_IND_ADAPTER
);
618 if (ret
== -EOPNOTSUPP
) {
620 * The host does not support adapter interrupts
621 * for virtio-ccw, stop trying.
623 virtio_ccw_use_airq
= 0;
624 pr_info("Adapter interrupts unsupported on host\n");
626 dev_warn(&vcdev
->cdev
->dev
,
627 "enabling adapter interrupts = %d\n", ret
);
628 virtio_ccw_drop_indicators(vcdev
);
635 static int virtio_ccw_find_vqs(struct virtio_device
*vdev
, unsigned nvqs
,
636 struct virtqueue
*vqs
[],
637 vq_callback_t
*callbacks
[],
638 const char * const names
[])
640 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
641 unsigned long *indicatorp
= NULL
;
645 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
649 for (i
= 0; i
< nvqs
; ++i
) {
650 vqs
[i
] = virtio_ccw_setup_vq(vdev
, i
, callbacks
[i
], names
[i
],
652 if (IS_ERR(vqs
[i
])) {
653 ret
= PTR_ERR(vqs
[i
]);
659 /* We need a data area under 2G to communicate. */
660 indicatorp
= kmalloc(sizeof(&vcdev
->indicators
), GFP_DMA
| GFP_KERNEL
);
663 *indicatorp
= (unsigned long) &vcdev
->indicators
;
664 if (vcdev
->is_thinint
) {
665 ret
= virtio_ccw_register_adapter_ind(vcdev
, vqs
, nvqs
, ccw
);
667 /* no error, just fall back to legacy interrupts */
668 vcdev
->is_thinint
= 0;
670 if (!vcdev
->is_thinint
) {
671 /* Register queue indicators with host. */
672 vcdev
->indicators
= 0;
673 ccw
->cmd_code
= CCW_CMD_SET_IND
;
675 ccw
->count
= sizeof(vcdev
->indicators
);
676 ccw
->cda
= (__u32
)(unsigned long) indicatorp
;
677 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_SET_IND
);
681 /* Register indicators2 with host for config changes */
682 *indicatorp
= (unsigned long) &vcdev
->indicators2
;
683 vcdev
->indicators2
= 0;
684 ccw
->cmd_code
= CCW_CMD_SET_CONF_IND
;
686 ccw
->count
= sizeof(vcdev
->indicators2
);
687 ccw
->cda
= (__u32
)(unsigned long) indicatorp
;
688 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_SET_CONF_IND
);
698 virtio_ccw_del_vqs(vdev
);
702 static void virtio_ccw_reset(struct virtio_device
*vdev
)
704 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
707 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
711 /* Zero status bits. */
714 /* Send a reset ccw on device. */
715 ccw
->cmd_code
= CCW_CMD_VDEV_RESET
;
719 ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_RESET
);
723 static u64
virtio_ccw_get_features(struct virtio_device
*vdev
)
725 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
726 struct virtio_feature_desc
*features
;
731 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
735 features
= kzalloc(sizeof(*features
), GFP_DMA
| GFP_KERNEL
);
740 /* Read the feature bits from the host. */
742 ccw
->cmd_code
= CCW_CMD_READ_FEAT
;
744 ccw
->count
= sizeof(*features
);
745 ccw
->cda
= (__u32
)(unsigned long)features
;
746 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_READ_FEAT
);
752 rc
= le32_to_cpu(features
->features
);
754 if (vcdev
->revision
== 0)
757 /* Read second half of the feature bits from the host. */
759 ccw
->cmd_code
= CCW_CMD_READ_FEAT
;
761 ccw
->count
= sizeof(*features
);
762 ccw
->cda
= (__u32
)(unsigned long)features
;
763 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_READ_FEAT
);
765 rc
|= (u64
)le32_to_cpu(features
->features
) << 32;
773 static int virtio_ccw_finalize_features(struct virtio_device
*vdev
)
775 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
776 struct virtio_feature_desc
*features
;
780 if (vcdev
->revision
>= 1 &&
781 !__virtio_test_bit(vdev
, VIRTIO_F_VERSION_1
)) {
782 dev_err(&vdev
->dev
, "virtio: device uses revision 1 "
783 "but does not have VIRTIO_F_VERSION_1\n");
787 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
791 features
= kzalloc(sizeof(*features
), GFP_DMA
| GFP_KERNEL
);
796 /* Give virtio_ring a chance to accept features. */
797 vring_transport_features(vdev
);
800 features
->features
= cpu_to_le32((u32
)vdev
->features
);
801 /* Write the first half of the feature bits to the host. */
802 ccw
->cmd_code
= CCW_CMD_WRITE_FEAT
;
804 ccw
->count
= sizeof(*features
);
805 ccw
->cda
= (__u32
)(unsigned long)features
;
806 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_WRITE_FEAT
);
810 if (vcdev
->revision
== 0)
814 features
->features
= cpu_to_le32(vdev
->features
>> 32);
815 /* Write the second half of the feature bits to the host. */
816 ccw
->cmd_code
= CCW_CMD_WRITE_FEAT
;
818 ccw
->count
= sizeof(*features
);
819 ccw
->cda
= (__u32
)(unsigned long)features
;
820 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_WRITE_FEAT
);
829 static void virtio_ccw_get_config(struct virtio_device
*vdev
,
830 unsigned int offset
, void *buf
, unsigned len
)
832 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
837 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
841 config_area
= kzalloc(VIRTIO_CCW_CONFIG_SIZE
, GFP_DMA
| GFP_KERNEL
);
845 /* Read the config area from the host. */
846 ccw
->cmd_code
= CCW_CMD_READ_CONF
;
848 ccw
->count
= offset
+ len
;
849 ccw
->cda
= (__u32
)(unsigned long)config_area
;
850 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_READ_CONFIG
);
854 memcpy(vcdev
->config
, config_area
, offset
+ len
);
856 memcpy(buf
, &vcdev
->config
[offset
], len
);
857 if (vcdev
->config_ready
< offset
+ len
)
858 vcdev
->config_ready
= offset
+ len
;
865 static void virtio_ccw_set_config(struct virtio_device
*vdev
,
866 unsigned int offset
, const void *buf
,
869 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
873 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
877 config_area
= kzalloc(VIRTIO_CCW_CONFIG_SIZE
, GFP_DMA
| GFP_KERNEL
);
881 /* Make sure we don't overwrite fields. */
882 if (vcdev
->config_ready
< offset
)
883 virtio_ccw_get_config(vdev
, 0, NULL
, offset
);
884 memcpy(&vcdev
->config
[offset
], buf
, len
);
885 /* Write the config area to the host. */
886 memcpy(config_area
, vcdev
->config
, sizeof(vcdev
->config
));
887 ccw
->cmd_code
= CCW_CMD_WRITE_CONF
;
889 ccw
->count
= offset
+ len
;
890 ccw
->cda
= (__u32
)(unsigned long)config_area
;
891 ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_WRITE_CONFIG
);
898 static u8
virtio_ccw_get_status(struct virtio_device
*vdev
)
900 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
902 return *vcdev
->status
;
905 static void virtio_ccw_set_status(struct virtio_device
*vdev
, u8 status
)
907 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
908 u8 old_status
= *vcdev
->status
;
912 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
916 /* Write the status to the host. */
917 *vcdev
->status
= status
;
918 ccw
->cmd_code
= CCW_CMD_WRITE_STATUS
;
920 ccw
->count
= sizeof(status
);
921 ccw
->cda
= (__u32
)(unsigned long)vcdev
->status
;
922 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_WRITE_STATUS
);
923 /* Write failed? We assume status is unchanged. */
925 *vcdev
->status
= old_status
;
929 static struct virtio_config_ops virtio_ccw_config_ops
= {
930 .get_features
= virtio_ccw_get_features
,
931 .finalize_features
= virtio_ccw_finalize_features
,
932 .get
= virtio_ccw_get_config
,
933 .set
= virtio_ccw_set_config
,
934 .get_status
= virtio_ccw_get_status
,
935 .set_status
= virtio_ccw_set_status
,
936 .reset
= virtio_ccw_reset
,
937 .find_vqs
= virtio_ccw_find_vqs
,
938 .del_vqs
= virtio_ccw_del_vqs
,
943 * ccw bus driver related functions
946 static void virtio_ccw_release_dev(struct device
*_d
)
948 struct virtio_device
*dev
= container_of(_d
, struct virtio_device
,
950 struct virtio_ccw_device
*vcdev
= to_vc_device(dev
);
952 kfree(vcdev
->status
);
953 kfree(vcdev
->config_block
);
957 static int irb_is_error(struct irb
*irb
)
959 if (scsw_cstat(&irb
->scsw
) != 0)
961 if (scsw_dstat(&irb
->scsw
) & ~(DEV_STAT_CHN_END
| DEV_STAT_DEV_END
))
963 if (scsw_cc(&irb
->scsw
) != 0)
968 static struct virtqueue
*virtio_ccw_vq_by_ind(struct virtio_ccw_device
*vcdev
,
971 struct virtio_ccw_vq_info
*info
;
973 struct virtqueue
*vq
;
976 spin_lock_irqsave(&vcdev
->lock
, flags
);
977 list_for_each_entry(info
, &vcdev
->virtqueues
, node
) {
978 if (info
->vq
->index
== index
) {
983 spin_unlock_irqrestore(&vcdev
->lock
, flags
);
987 static void virtio_ccw_check_activity(struct virtio_ccw_device
*vcdev
,
990 if (vcdev
->curr_io
& activity
) {
992 case VIRTIO_CCW_DOING_READ_FEAT
:
993 case VIRTIO_CCW_DOING_WRITE_FEAT
:
994 case VIRTIO_CCW_DOING_READ_CONFIG
:
995 case VIRTIO_CCW_DOING_WRITE_CONFIG
:
996 case VIRTIO_CCW_DOING_WRITE_STATUS
:
997 case VIRTIO_CCW_DOING_SET_VQ
:
998 case VIRTIO_CCW_DOING_SET_IND
:
999 case VIRTIO_CCW_DOING_SET_CONF_IND
:
1000 case VIRTIO_CCW_DOING_RESET
:
1001 case VIRTIO_CCW_DOING_READ_VQ_CONF
:
1002 case VIRTIO_CCW_DOING_SET_IND_ADAPTER
:
1003 case VIRTIO_CCW_DOING_SET_VIRTIO_REV
:
1004 vcdev
->curr_io
&= ~activity
;
1005 wake_up(&vcdev
->wait_q
);
1008 /* don't know what to do... */
1009 dev_warn(&vcdev
->cdev
->dev
,
1010 "Suspicious activity '%08x'\n", activity
);
1017 static void virtio_ccw_int_handler(struct ccw_device
*cdev
,
1018 unsigned long intparm
,
1021 __u32 activity
= intparm
& VIRTIO_CCW_INTPARM_MASK
;
1022 struct virtio_ccw_device
*vcdev
= dev_get_drvdata(&cdev
->dev
);
1024 struct virtqueue
*vq
;
1029 vcdev
->err
= PTR_ERR(irb
);
1030 virtio_ccw_check_activity(vcdev
, activity
);
1031 /* Don't poke around indicators, something's wrong. */
1034 /* Check if it's a notification from the host. */
1035 if ((intparm
== 0) &&
1036 (scsw_stctl(&irb
->scsw
) ==
1037 (SCSW_STCTL_ALERT_STATUS
| SCSW_STCTL_STATUS_PEND
))) {
1040 if (irb_is_error(irb
)) {
1041 /* Command reject? */
1042 if ((scsw_dstat(&irb
->scsw
) & DEV_STAT_UNIT_CHECK
) &&
1043 (irb
->ecw
[0] & SNS0_CMD_REJECT
))
1044 vcdev
->err
= -EOPNOTSUPP
;
1046 /* Map everything else to -EIO. */
1049 virtio_ccw_check_activity(vcdev
, activity
);
1050 for_each_set_bit(i
, &vcdev
->indicators
,
1051 sizeof(vcdev
->indicators
) * BITS_PER_BYTE
) {
1052 /* The bit clear must happen before the vring kick. */
1053 clear_bit(i
, &vcdev
->indicators
);
1055 vq
= virtio_ccw_vq_by_ind(vcdev
, i
);
1056 vring_interrupt(0, vq
);
1058 if (test_bit(0, &vcdev
->indicators2
)) {
1059 virtio_config_changed(&vcdev
->vdev
);
1060 clear_bit(0, &vcdev
->indicators2
);
1065 * We usually want to autoonline all devices, but give the admin
1066 * a way to exempt devices from this.
1068 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1070 static unsigned long devs_no_auto
[__MAX_SSID
+ 1][__DEV_WORDS
];
1072 static char *no_auto
= "";
1074 module_param(no_auto
, charp
, 0444);
1075 MODULE_PARM_DESC(no_auto
, "list of ccw bus id ranges not to be auto-onlined");
1077 static int virtio_ccw_check_autoonline(struct ccw_device
*cdev
)
1079 struct ccw_dev_id id
;
1081 ccw_device_get_id(cdev
, &id
);
1082 if (test_bit(id
.devno
, devs_no_auto
[id
.ssid
]))
1087 static void virtio_ccw_auto_online(void *data
, async_cookie_t cookie
)
1089 struct ccw_device
*cdev
= data
;
1092 ret
= ccw_device_set_online(cdev
);
1094 dev_warn(&cdev
->dev
, "Failed to set online: %d\n", ret
);
1097 static int virtio_ccw_probe(struct ccw_device
*cdev
)
1099 cdev
->handler
= virtio_ccw_int_handler
;
1101 if (virtio_ccw_check_autoonline(cdev
))
1102 async_schedule(virtio_ccw_auto_online
, cdev
);
1106 static struct virtio_ccw_device
*virtio_grab_drvdata(struct ccw_device
*cdev
)
1108 unsigned long flags
;
1109 struct virtio_ccw_device
*vcdev
;
1111 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1112 vcdev
= dev_get_drvdata(&cdev
->dev
);
1113 if (!vcdev
|| vcdev
->going_away
) {
1114 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1117 vcdev
->going_away
= true;
1118 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1122 static void virtio_ccw_remove(struct ccw_device
*cdev
)
1124 unsigned long flags
;
1125 struct virtio_ccw_device
*vcdev
= virtio_grab_drvdata(cdev
);
1127 if (vcdev
&& cdev
->online
) {
1128 if (vcdev
->device_lost
)
1129 virtio_break_device(&vcdev
->vdev
);
1130 unregister_virtio_device(&vcdev
->vdev
);
1131 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1132 dev_set_drvdata(&cdev
->dev
, NULL
);
1133 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1135 cdev
->handler
= NULL
;
1138 static int virtio_ccw_offline(struct ccw_device
*cdev
)
1140 unsigned long flags
;
1141 struct virtio_ccw_device
*vcdev
= virtio_grab_drvdata(cdev
);
1145 if (vcdev
->device_lost
)
1146 virtio_break_device(&vcdev
->vdev
);
1147 unregister_virtio_device(&vcdev
->vdev
);
1148 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1149 dev_set_drvdata(&cdev
->dev
, NULL
);
1150 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1154 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device
*vcdev
)
1156 struct virtio_rev_info
*rev
;
1160 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
1163 rev
= kzalloc(sizeof(*rev
), GFP_DMA
| GFP_KERNEL
);
1169 /* Set transport revision */
1170 ccw
->cmd_code
= CCW_CMD_SET_VIRTIO_REV
;
1172 ccw
->count
= sizeof(*rev
);
1173 ccw
->cda
= (__u32
)(unsigned long)rev
;
1175 vcdev
->revision
= VIRTIO_CCW_REV_MAX
;
1177 rev
->revision
= vcdev
->revision
;
1178 /* none of our supported revisions carry payload */
1180 ret
= ccw_io_helper(vcdev
, ccw
,
1181 VIRTIO_CCW_DOING_SET_VIRTIO_REV
);
1182 if (ret
== -EOPNOTSUPP
) {
1183 if (vcdev
->revision
== 0)
1185 * The host device does not support setting
1186 * the revision: let's operate it in legacy
1193 } while (ret
== -EOPNOTSUPP
);
1200 static int virtio_ccw_online(struct ccw_device
*cdev
)
1203 struct virtio_ccw_device
*vcdev
;
1204 unsigned long flags
;
1206 vcdev
= kzalloc(sizeof(*vcdev
), GFP_KERNEL
);
1208 dev_warn(&cdev
->dev
, "Could not get memory for virtio\n");
1212 vcdev
->config_block
= kzalloc(sizeof(*vcdev
->config_block
),
1213 GFP_DMA
| GFP_KERNEL
);
1214 if (!vcdev
->config_block
) {
1218 vcdev
->status
= kzalloc(sizeof(*vcdev
->status
), GFP_DMA
| GFP_KERNEL
);
1219 if (!vcdev
->status
) {
1224 vcdev
->is_thinint
= virtio_ccw_use_airq
; /* at least try */
1226 vcdev
->vdev
.dev
.parent
= &cdev
->dev
;
1227 vcdev
->vdev
.dev
.release
= virtio_ccw_release_dev
;
1228 vcdev
->vdev
.config
= &virtio_ccw_config_ops
;
1230 init_waitqueue_head(&vcdev
->wait_q
);
1231 INIT_LIST_HEAD(&vcdev
->virtqueues
);
1232 spin_lock_init(&vcdev
->lock
);
1234 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1235 dev_set_drvdata(&cdev
->dev
, vcdev
);
1236 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1237 vcdev
->vdev
.id
.vendor
= cdev
->id
.cu_type
;
1238 vcdev
->vdev
.id
.device
= cdev
->id
.cu_model
;
1240 ret
= virtio_ccw_set_transport_rev(vcdev
);
1244 ret
= register_virtio_device(&vcdev
->vdev
);
1246 dev_warn(&cdev
->dev
, "Failed to register virtio device: %d\n",
1252 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1253 dev_set_drvdata(&cdev
->dev
, NULL
);
1254 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1255 put_device(&vcdev
->vdev
.dev
);
1259 kfree(vcdev
->status
);
1260 kfree(vcdev
->config_block
);
1266 static int virtio_ccw_cio_notify(struct ccw_device
*cdev
, int event
)
1269 struct virtio_ccw_device
*vcdev
= dev_get_drvdata(&cdev
->dev
);
1272 * Make sure vcdev is set
1273 * i.e. set_offline/remove callback not already running
1280 vcdev
->device_lost
= true;
1290 static struct ccw_device_id virtio_ids
[] = {
1291 { CCW_DEVICE(0x3832, 0) },
1294 MODULE_DEVICE_TABLE(ccw
, virtio_ids
);
1296 static struct ccw_driver virtio_ccw_driver
= {
1298 .owner
= THIS_MODULE
,
1299 .name
= "virtio_ccw",
1302 .probe
= virtio_ccw_probe
,
1303 .remove
= virtio_ccw_remove
,
1304 .set_offline
= virtio_ccw_offline
,
1305 .set_online
= virtio_ccw_online
,
1306 .notify
= virtio_ccw_cio_notify
,
1307 .int_class
= IRQIO_VIR
,
1310 static int __init
pure_hex(char **cp
, unsigned int *val
, int min_digit
,
1311 int max_digit
, int max_val
)
1318 while (diff
<= max_digit
) {
1319 int value
= hex_to_bin(**cp
);
1323 *val
= *val
* 16 + value
;
1328 if ((diff
< min_digit
) || (diff
> max_digit
) || (*val
> max_val
))
1334 static int __init
parse_busid(char *str
, unsigned int *cssid
,
1335 unsigned int *ssid
, unsigned int *devno
)
1346 ret
= pure_hex(&str_work
, cssid
, 1, 2, __MAX_CSSID
);
1347 if (ret
|| (str_work
[0] != '.'))
1350 ret
= pure_hex(&str_work
, ssid
, 1, 1, __MAX_SSID
);
1351 if (ret
|| (str_work
[0] != '.'))
1354 ret
= pure_hex(&str_work
, devno
, 4, 4, __MAX_SUBCHANNEL
);
1355 if (ret
|| (str_work
[0] != '\0'))
1363 static void __init
no_auto_parse(void)
1365 unsigned int from_cssid
, to_cssid
, from_ssid
, to_ssid
, from
, to
;
1370 while ((parm
= strsep(&str
, ","))) {
1371 rc
= parse_busid(strsep(&parm
, "-"), &from_cssid
,
1376 rc
= parse_busid(parm
, &to_cssid
,
1378 if ((from_ssid
> to_ssid
) ||
1379 ((from_ssid
== to_ssid
) && (from
> to
)))
1382 to_cssid
= from_cssid
;
1383 to_ssid
= from_ssid
;
1388 while ((from_ssid
< to_ssid
) ||
1389 ((from_ssid
== to_ssid
) && (from
<= to
))) {
1390 set_bit(from
, devs_no_auto
[from_ssid
]);
1392 if (from
> __MAX_SUBCHANNEL
) {
1400 static int __init
virtio_ccw_init(void)
1402 /* parse no_auto string before we do anything further */
1404 return ccw_driver_register(&virtio_ccw_driver
);
1406 module_init(virtio_ccw_init
);
1408 static void __exit
virtio_ccw_exit(void)
1412 ccw_driver_unregister(&virtio_ccw_driver
);
1413 for (i
= 0; i
< MAX_AIRQ_AREAS
; i
++)
1414 destroy_airq_info(airq_areas
[i
]);
1416 module_exit(virtio_ccw_exit
);