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
,
487 const char *name
, bool ctx
,
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, ctx
, 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 irq_affinity
*desc
)
635 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
636 unsigned long *indicatorp
= NULL
;
640 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
644 for (i
= 0; i
< nvqs
; ++i
) {
645 vqs
[i
] = virtio_ccw_setup_vq(vdev
, i
, callbacks
[i
], names
[i
],
646 ctx
? ctx
[i
] : false, ccw
);
647 if (IS_ERR(vqs
[i
])) {
648 ret
= PTR_ERR(vqs
[i
]);
655 * We need a data area under 2G to communicate. Our payload is
656 * the address of the indicators.
658 indicatorp
= kmalloc(sizeof(&vcdev
->indicators
), GFP_DMA
| GFP_KERNEL
);
661 *indicatorp
= (unsigned long) &vcdev
->indicators
;
662 if (vcdev
->is_thinint
) {
663 ret
= virtio_ccw_register_adapter_ind(vcdev
, vqs
, nvqs
, ccw
);
665 /* no error, just fall back to legacy interrupts */
666 vcdev
->is_thinint
= false;
668 if (!vcdev
->is_thinint
) {
669 /* Register queue indicators with host. */
670 vcdev
->indicators
= 0;
671 ccw
->cmd_code
= CCW_CMD_SET_IND
;
673 ccw
->count
= sizeof(&vcdev
->indicators
);
674 ccw
->cda
= (__u32
)(unsigned long) indicatorp
;
675 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_SET_IND
);
679 /* Register indicators2 with host for config changes */
680 *indicatorp
= (unsigned long) &vcdev
->indicators2
;
681 vcdev
->indicators2
= 0;
682 ccw
->cmd_code
= CCW_CMD_SET_CONF_IND
;
684 ccw
->count
= sizeof(&vcdev
->indicators2
);
685 ccw
->cda
= (__u32
)(unsigned long) indicatorp
;
686 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_SET_CONF_IND
);
696 virtio_ccw_del_vqs(vdev
);
700 static void virtio_ccw_reset(struct virtio_device
*vdev
)
702 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
705 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
709 /* Zero status bits. */
712 /* Send a reset ccw on device. */
713 ccw
->cmd_code
= CCW_CMD_VDEV_RESET
;
717 ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_RESET
);
721 static u64
virtio_ccw_get_features(struct virtio_device
*vdev
)
723 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
724 struct virtio_feature_desc
*features
;
729 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
733 features
= kzalloc(sizeof(*features
), GFP_DMA
| GFP_KERNEL
);
738 /* Read the feature bits from the host. */
740 ccw
->cmd_code
= CCW_CMD_READ_FEAT
;
742 ccw
->count
= sizeof(*features
);
743 ccw
->cda
= (__u32
)(unsigned long)features
;
744 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_READ_FEAT
);
750 rc
= le32_to_cpu(features
->features
);
752 if (vcdev
->revision
== 0)
755 /* Read second half of the feature bits from the host. */
757 ccw
->cmd_code
= CCW_CMD_READ_FEAT
;
759 ccw
->count
= sizeof(*features
);
760 ccw
->cda
= (__u32
)(unsigned long)features
;
761 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_READ_FEAT
);
763 rc
|= (u64
)le32_to_cpu(features
->features
) << 32;
771 static int virtio_ccw_finalize_features(struct virtio_device
*vdev
)
773 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
774 struct virtio_feature_desc
*features
;
778 if (vcdev
->revision
>= 1 &&
779 !__virtio_test_bit(vdev
, VIRTIO_F_VERSION_1
)) {
780 dev_err(&vdev
->dev
, "virtio: device uses revision 1 "
781 "but does not have VIRTIO_F_VERSION_1\n");
785 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
789 features
= kzalloc(sizeof(*features
), GFP_DMA
| GFP_KERNEL
);
794 /* Give virtio_ring a chance to accept features. */
795 vring_transport_features(vdev
);
798 features
->features
= cpu_to_le32((u32
)vdev
->features
);
799 /* Write the first half of the feature bits to the host. */
800 ccw
->cmd_code
= CCW_CMD_WRITE_FEAT
;
802 ccw
->count
= sizeof(*features
);
803 ccw
->cda
= (__u32
)(unsigned long)features
;
804 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_WRITE_FEAT
);
808 if (vcdev
->revision
== 0)
812 features
->features
= cpu_to_le32(vdev
->features
>> 32);
813 /* Write the second half of the feature bits to the host. */
814 ccw
->cmd_code
= CCW_CMD_WRITE_FEAT
;
816 ccw
->count
= sizeof(*features
);
817 ccw
->cda
= (__u32
)(unsigned long)features
;
818 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_WRITE_FEAT
);
827 static void virtio_ccw_get_config(struct virtio_device
*vdev
,
828 unsigned int offset
, void *buf
, unsigned len
)
830 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
835 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
839 config_area
= kzalloc(VIRTIO_CCW_CONFIG_SIZE
, GFP_DMA
| GFP_KERNEL
);
843 /* Read the config area from the host. */
844 ccw
->cmd_code
= CCW_CMD_READ_CONF
;
846 ccw
->count
= offset
+ len
;
847 ccw
->cda
= (__u32
)(unsigned long)config_area
;
848 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_READ_CONFIG
);
852 memcpy(vcdev
->config
, config_area
, offset
+ len
);
854 memcpy(buf
, &vcdev
->config
[offset
], len
);
855 if (vcdev
->config_ready
< offset
+ len
)
856 vcdev
->config_ready
= offset
+ len
;
863 static void virtio_ccw_set_config(struct virtio_device
*vdev
,
864 unsigned int offset
, const void *buf
,
867 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
871 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
875 config_area
= kzalloc(VIRTIO_CCW_CONFIG_SIZE
, GFP_DMA
| GFP_KERNEL
);
879 /* Make sure we don't overwrite fields. */
880 if (vcdev
->config_ready
< offset
)
881 virtio_ccw_get_config(vdev
, 0, NULL
, offset
);
882 memcpy(&vcdev
->config
[offset
], buf
, len
);
883 /* Write the config area to the host. */
884 memcpy(config_area
, vcdev
->config
, sizeof(vcdev
->config
));
885 ccw
->cmd_code
= CCW_CMD_WRITE_CONF
;
887 ccw
->count
= offset
+ len
;
888 ccw
->cda
= (__u32
)(unsigned long)config_area
;
889 ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_WRITE_CONFIG
);
896 static u8
virtio_ccw_get_status(struct virtio_device
*vdev
)
898 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
899 u8 old_status
= *vcdev
->status
;
902 if (vcdev
->revision
< 1)
903 return *vcdev
->status
;
905 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
909 ccw
->cmd_code
= CCW_CMD_READ_STATUS
;
911 ccw
->count
= sizeof(*vcdev
->status
);
912 ccw
->cda
= (__u32
)(unsigned long)vcdev
->status
;
913 ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_READ_STATUS
);
915 * If the channel program failed (should only happen if the device
916 * was hotunplugged, and then we clean up via the machine check
917 * handler anyway), vcdev->status was not overwritten and we just
918 * return the old status, which is fine.
922 return *vcdev
->status
;
925 static void virtio_ccw_set_status(struct virtio_device
*vdev
, u8 status
)
927 struct virtio_ccw_device
*vcdev
= to_vc_device(vdev
);
928 u8 old_status
= *vcdev
->status
;
932 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
936 /* Write the status to the host. */
937 *vcdev
->status
= status
;
938 ccw
->cmd_code
= CCW_CMD_WRITE_STATUS
;
940 ccw
->count
= sizeof(status
);
941 ccw
->cda
= (__u32
)(unsigned long)vcdev
->status
;
942 ret
= ccw_io_helper(vcdev
, ccw
, VIRTIO_CCW_DOING_WRITE_STATUS
);
943 /* Write failed? We assume status is unchanged. */
945 *vcdev
->status
= old_status
;
949 static const struct virtio_config_ops virtio_ccw_config_ops
= {
950 .get_features
= virtio_ccw_get_features
,
951 .finalize_features
= virtio_ccw_finalize_features
,
952 .get
= virtio_ccw_get_config
,
953 .set
= virtio_ccw_set_config
,
954 .get_status
= virtio_ccw_get_status
,
955 .set_status
= virtio_ccw_set_status
,
956 .reset
= virtio_ccw_reset
,
957 .find_vqs
= virtio_ccw_find_vqs
,
958 .del_vqs
= virtio_ccw_del_vqs
,
963 * ccw bus driver related functions
966 static void virtio_ccw_release_dev(struct device
*_d
)
968 struct virtio_device
*dev
= dev_to_virtio(_d
);
969 struct virtio_ccw_device
*vcdev
= to_vc_device(dev
);
971 kfree(vcdev
->status
);
972 kfree(vcdev
->config_block
);
976 static int irb_is_error(struct irb
*irb
)
978 if (scsw_cstat(&irb
->scsw
) != 0)
980 if (scsw_dstat(&irb
->scsw
) & ~(DEV_STAT_CHN_END
| DEV_STAT_DEV_END
))
982 if (scsw_cc(&irb
->scsw
) != 0)
987 static struct virtqueue
*virtio_ccw_vq_by_ind(struct virtio_ccw_device
*vcdev
,
990 struct virtio_ccw_vq_info
*info
;
992 struct virtqueue
*vq
;
995 spin_lock_irqsave(&vcdev
->lock
, flags
);
996 list_for_each_entry(info
, &vcdev
->virtqueues
, node
) {
997 if (info
->vq
->index
== index
) {
1002 spin_unlock_irqrestore(&vcdev
->lock
, flags
);
1006 static void virtio_ccw_check_activity(struct virtio_ccw_device
*vcdev
,
1009 if (vcdev
->curr_io
& activity
) {
1011 case VIRTIO_CCW_DOING_READ_FEAT
:
1012 case VIRTIO_CCW_DOING_WRITE_FEAT
:
1013 case VIRTIO_CCW_DOING_READ_CONFIG
:
1014 case VIRTIO_CCW_DOING_WRITE_CONFIG
:
1015 case VIRTIO_CCW_DOING_WRITE_STATUS
:
1016 case VIRTIO_CCW_DOING_READ_STATUS
:
1017 case VIRTIO_CCW_DOING_SET_VQ
:
1018 case VIRTIO_CCW_DOING_SET_IND
:
1019 case VIRTIO_CCW_DOING_SET_CONF_IND
:
1020 case VIRTIO_CCW_DOING_RESET
:
1021 case VIRTIO_CCW_DOING_READ_VQ_CONF
:
1022 case VIRTIO_CCW_DOING_SET_IND_ADAPTER
:
1023 case VIRTIO_CCW_DOING_SET_VIRTIO_REV
:
1024 vcdev
->curr_io
&= ~activity
;
1025 wake_up(&vcdev
->wait_q
);
1028 /* don't know what to do... */
1029 dev_warn(&vcdev
->cdev
->dev
,
1030 "Suspicious activity '%08x'\n", activity
);
1037 static void virtio_ccw_int_handler(struct ccw_device
*cdev
,
1038 unsigned long intparm
,
1041 __u32 activity
= intparm
& VIRTIO_CCW_INTPARM_MASK
;
1042 struct virtio_ccw_device
*vcdev
= dev_get_drvdata(&cdev
->dev
);
1044 struct virtqueue
*vq
;
1049 vcdev
->err
= PTR_ERR(irb
);
1050 virtio_ccw_check_activity(vcdev
, activity
);
1051 /* Don't poke around indicators, something's wrong. */
1054 /* Check if it's a notification from the host. */
1055 if ((intparm
== 0) &&
1056 (scsw_stctl(&irb
->scsw
) ==
1057 (SCSW_STCTL_ALERT_STATUS
| SCSW_STCTL_STATUS_PEND
))) {
1060 if (irb_is_error(irb
)) {
1061 /* Command reject? */
1062 if ((scsw_dstat(&irb
->scsw
) & DEV_STAT_UNIT_CHECK
) &&
1063 (irb
->ecw
[0] & SNS0_CMD_REJECT
))
1064 vcdev
->err
= -EOPNOTSUPP
;
1066 /* Map everything else to -EIO. */
1069 virtio_ccw_check_activity(vcdev
, activity
);
1070 for_each_set_bit(i
, &vcdev
->indicators
,
1071 sizeof(vcdev
->indicators
) * BITS_PER_BYTE
) {
1072 /* The bit clear must happen before the vring kick. */
1073 clear_bit(i
, &vcdev
->indicators
);
1075 vq
= virtio_ccw_vq_by_ind(vcdev
, i
);
1076 vring_interrupt(0, vq
);
1078 if (test_bit(0, &vcdev
->indicators2
)) {
1079 virtio_config_changed(&vcdev
->vdev
);
1080 clear_bit(0, &vcdev
->indicators2
);
1085 * We usually want to autoonline all devices, but give the admin
1086 * a way to exempt devices from this.
1088 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1090 static unsigned long devs_no_auto
[__MAX_SSID
+ 1][__DEV_WORDS
];
1092 static char *no_auto
= "";
1094 module_param(no_auto
, charp
, 0444);
1095 MODULE_PARM_DESC(no_auto
, "list of ccw bus id ranges not to be auto-onlined");
1097 static int virtio_ccw_check_autoonline(struct ccw_device
*cdev
)
1099 struct ccw_dev_id id
;
1101 ccw_device_get_id(cdev
, &id
);
1102 if (test_bit(id
.devno
, devs_no_auto
[id
.ssid
]))
1107 static void virtio_ccw_auto_online(void *data
, async_cookie_t cookie
)
1109 struct ccw_device
*cdev
= data
;
1112 ret
= ccw_device_set_online(cdev
);
1114 dev_warn(&cdev
->dev
, "Failed to set online: %d\n", ret
);
1117 static int virtio_ccw_probe(struct ccw_device
*cdev
)
1119 cdev
->handler
= virtio_ccw_int_handler
;
1121 if (virtio_ccw_check_autoonline(cdev
))
1122 async_schedule(virtio_ccw_auto_online
, cdev
);
1126 static struct virtio_ccw_device
*virtio_grab_drvdata(struct ccw_device
*cdev
)
1128 unsigned long flags
;
1129 struct virtio_ccw_device
*vcdev
;
1131 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1132 vcdev
= dev_get_drvdata(&cdev
->dev
);
1133 if (!vcdev
|| vcdev
->going_away
) {
1134 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1137 vcdev
->going_away
= true;
1138 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1142 static void virtio_ccw_remove(struct ccw_device
*cdev
)
1144 unsigned long flags
;
1145 struct virtio_ccw_device
*vcdev
= virtio_grab_drvdata(cdev
);
1147 if (vcdev
&& cdev
->online
) {
1148 if (vcdev
->device_lost
)
1149 virtio_break_device(&vcdev
->vdev
);
1150 unregister_virtio_device(&vcdev
->vdev
);
1151 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1152 dev_set_drvdata(&cdev
->dev
, NULL
);
1153 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1155 cdev
->handler
= NULL
;
1158 static int virtio_ccw_offline(struct ccw_device
*cdev
)
1160 unsigned long flags
;
1161 struct virtio_ccw_device
*vcdev
= virtio_grab_drvdata(cdev
);
1165 if (vcdev
->device_lost
)
1166 virtio_break_device(&vcdev
->vdev
);
1167 unregister_virtio_device(&vcdev
->vdev
);
1168 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1169 dev_set_drvdata(&cdev
->dev
, NULL
);
1170 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1174 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device
*vcdev
)
1176 struct virtio_rev_info
*rev
;
1180 ccw
= kzalloc(sizeof(*ccw
), GFP_DMA
| GFP_KERNEL
);
1183 rev
= kzalloc(sizeof(*rev
), GFP_DMA
| GFP_KERNEL
);
1189 /* Set transport revision */
1190 ccw
->cmd_code
= CCW_CMD_SET_VIRTIO_REV
;
1192 ccw
->count
= sizeof(*rev
);
1193 ccw
->cda
= (__u32
)(unsigned long)rev
;
1195 vcdev
->revision
= VIRTIO_CCW_REV_MAX
;
1197 rev
->revision
= vcdev
->revision
;
1198 /* none of our supported revisions carry payload */
1200 ret
= ccw_io_helper(vcdev
, ccw
,
1201 VIRTIO_CCW_DOING_SET_VIRTIO_REV
);
1202 if (ret
== -EOPNOTSUPP
) {
1203 if (vcdev
->revision
== 0)
1205 * The host device does not support setting
1206 * the revision: let's operate it in legacy
1213 } while (ret
== -EOPNOTSUPP
);
1220 static int virtio_ccw_online(struct ccw_device
*cdev
)
1223 struct virtio_ccw_device
*vcdev
;
1224 unsigned long flags
;
1226 vcdev
= kzalloc(sizeof(*vcdev
), GFP_KERNEL
);
1228 dev_warn(&cdev
->dev
, "Could not get memory for virtio\n");
1232 vcdev
->config_block
= kzalloc(sizeof(*vcdev
->config_block
),
1233 GFP_DMA
| GFP_KERNEL
);
1234 if (!vcdev
->config_block
) {
1238 vcdev
->status
= kzalloc(sizeof(*vcdev
->status
), GFP_DMA
| GFP_KERNEL
);
1239 if (!vcdev
->status
) {
1244 vcdev
->is_thinint
= virtio_ccw_use_airq
; /* at least try */
1246 vcdev
->vdev
.dev
.parent
= &cdev
->dev
;
1247 vcdev
->vdev
.dev
.release
= virtio_ccw_release_dev
;
1248 vcdev
->vdev
.config
= &virtio_ccw_config_ops
;
1250 init_waitqueue_head(&vcdev
->wait_q
);
1251 INIT_LIST_HEAD(&vcdev
->virtqueues
);
1252 spin_lock_init(&vcdev
->lock
);
1254 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1255 dev_set_drvdata(&cdev
->dev
, vcdev
);
1256 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1257 vcdev
->vdev
.id
.vendor
= cdev
->id
.cu_type
;
1258 vcdev
->vdev
.id
.device
= cdev
->id
.cu_model
;
1260 ret
= virtio_ccw_set_transport_rev(vcdev
);
1264 ret
= register_virtio_device(&vcdev
->vdev
);
1266 dev_warn(&cdev
->dev
, "Failed to register virtio device: %d\n",
1272 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1273 dev_set_drvdata(&cdev
->dev
, NULL
);
1274 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1275 put_device(&vcdev
->vdev
.dev
);
1279 kfree(vcdev
->status
);
1280 kfree(vcdev
->config_block
);
1286 static int virtio_ccw_cio_notify(struct ccw_device
*cdev
, int event
)
1289 struct virtio_ccw_device
*vcdev
= dev_get_drvdata(&cdev
->dev
);
1292 * Make sure vcdev is set
1293 * i.e. set_offline/remove callback not already running
1300 vcdev
->device_lost
= true;
1310 static struct ccw_device_id virtio_ids
[] = {
1311 { CCW_DEVICE(0x3832, 0) },
1315 static struct ccw_driver virtio_ccw_driver
= {
1317 .owner
= THIS_MODULE
,
1318 .name
= "virtio_ccw",
1321 .probe
= virtio_ccw_probe
,
1322 .remove
= virtio_ccw_remove
,
1323 .set_offline
= virtio_ccw_offline
,
1324 .set_online
= virtio_ccw_online
,
1325 .notify
= virtio_ccw_cio_notify
,
1326 .int_class
= IRQIO_VIR
,
1329 static int __init
pure_hex(char **cp
, unsigned int *val
, int min_digit
,
1330 int max_digit
, int max_val
)
1337 while (diff
<= max_digit
) {
1338 int value
= hex_to_bin(**cp
);
1342 *val
= *val
* 16 + value
;
1347 if ((diff
< min_digit
) || (diff
> max_digit
) || (*val
> max_val
))
1353 static int __init
parse_busid(char *str
, unsigned int *cssid
,
1354 unsigned int *ssid
, unsigned int *devno
)
1365 ret
= pure_hex(&str_work
, cssid
, 1, 2, __MAX_CSSID
);
1366 if (ret
|| (str_work
[0] != '.'))
1369 ret
= pure_hex(&str_work
, ssid
, 1, 1, __MAX_SSID
);
1370 if (ret
|| (str_work
[0] != '.'))
1373 ret
= pure_hex(&str_work
, devno
, 4, 4, __MAX_SUBCHANNEL
);
1374 if (ret
|| (str_work
[0] != '\0'))
1382 static void __init
no_auto_parse(void)
1384 unsigned int from_cssid
, to_cssid
, from_ssid
, to_ssid
, from
, to
;
1389 while ((parm
= strsep(&str
, ","))) {
1390 rc
= parse_busid(strsep(&parm
, "-"), &from_cssid
,
1395 rc
= parse_busid(parm
, &to_cssid
,
1397 if ((from_ssid
> to_ssid
) ||
1398 ((from_ssid
== to_ssid
) && (from
> to
)))
1401 to_cssid
= from_cssid
;
1402 to_ssid
= from_ssid
;
1407 while ((from_ssid
< to_ssid
) ||
1408 ((from_ssid
== to_ssid
) && (from
<= to
))) {
1409 set_bit(from
, devs_no_auto
[from_ssid
]);
1411 if (from
> __MAX_SUBCHANNEL
) {
1419 static int __init
virtio_ccw_init(void)
1421 /* parse no_auto string before we do anything further */
1423 return ccw_driver_register(&virtio_ccw_driver
);
1425 device_initcall(virtio_ccw_init
);