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- // SPDX-License-Identifier: GPL-2.0
- /*
- * ccw based virtio transport
- *
- * Copyright IBM Corp. 2012, 2014
- *
- * Author(s): Cornelia Huck <[email protected]>
- */
- #include <linux/kernel_stat.h>
- #include <linux/init.h>
- #include <linux/memblock.h>
- #include <linux/err.h>
- #include <linux/virtio.h>
- #include <linux/virtio_config.h>
- #include <linux/slab.h>
- #include <linux/interrupt.h>
- #include <linux/virtio_ring.h>
- #include <linux/pfn.h>
- #include <linux/async.h>
- #include <linux/wait.h>
- #include <linux/list.h>
- #include <linux/bitops.h>
- #include <linux/moduleparam.h>
- #include <linux/io.h>
- #include <linux/kvm_para.h>
- #include <linux/notifier.h>
- #include <asm/diag.h>
- #include <asm/setup.h>
- #include <asm/irq.h>
- #include <asm/cio.h>
- #include <asm/ccwdev.h>
- #include <asm/virtio-ccw.h>
- #include <asm/isc.h>
- #include <asm/airq.h>
- #include <asm/tpi.h>
- /*
- * virtio related functions
- */
- struct vq_config_block {
- __u16 index;
- __u16 num;
- } __packed;
- #define VIRTIO_CCW_CONFIG_SIZE 0x100
- /* same as PCI config space size, should be enough for all drivers */
- struct vcdev_dma_area {
- unsigned long indicators;
- unsigned long indicators2;
- struct vq_config_block config_block;
- __u8 status;
- };
- struct virtio_ccw_device {
- struct virtio_device vdev;
- __u8 config[VIRTIO_CCW_CONFIG_SIZE];
- struct ccw_device *cdev;
- __u32 curr_io;
- int err;
- unsigned int revision; /* Transport revision */
- wait_queue_head_t wait_q;
- spinlock_t lock;
- rwlock_t irq_lock;
- struct mutex io_lock; /* Serializes I/O requests */
- struct list_head virtqueues;
- bool is_thinint;
- bool going_away;
- bool device_lost;
- unsigned int config_ready;
- void *airq_info;
- struct vcdev_dma_area *dma_area;
- };
- static inline unsigned long *indicators(struct virtio_ccw_device *vcdev)
- {
- return &vcdev->dma_area->indicators;
- }
- static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev)
- {
- return &vcdev->dma_area->indicators2;
- }
- struct vq_info_block_legacy {
- __u64 queue;
- __u32 align;
- __u16 index;
- __u16 num;
- } __packed;
- struct vq_info_block {
- __u64 desc;
- __u32 res0;
- __u16 index;
- __u16 num;
- __u64 avail;
- __u64 used;
- } __packed;
- struct virtio_feature_desc {
- __le32 features;
- __u8 index;
- } __packed;
- struct virtio_thinint_area {
- unsigned long summary_indicator;
- unsigned long indicator;
- u64 bit_nr;
- u8 isc;
- } __packed;
- struct virtio_rev_info {
- __u16 revision;
- __u16 length;
- __u8 data[];
- };
- /* the highest virtio-ccw revision we support */
- #define VIRTIO_CCW_REV_MAX 2
- struct virtio_ccw_vq_info {
- struct virtqueue *vq;
- int num;
- union {
- struct vq_info_block s;
- struct vq_info_block_legacy l;
- } *info_block;
- int bit_nr;
- struct list_head node;
- long cookie;
- };
- #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */
- #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8)
- #define MAX_AIRQ_AREAS 20
- static int virtio_ccw_use_airq = 1;
- struct airq_info {
- rwlock_t lock;
- u8 summary_indicator_idx;
- struct airq_struct airq;
- struct airq_iv *aiv;
- };
- static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
- static DEFINE_MUTEX(airq_areas_lock);
- static u8 *summary_indicators;
- static inline u8 *get_summary_indicator(struct airq_info *info)
- {
- return summary_indicators + info->summary_indicator_idx;
- }
- #define CCW_CMD_SET_VQ 0x13
- #define CCW_CMD_VDEV_RESET 0x33
- #define CCW_CMD_SET_IND 0x43
- #define CCW_CMD_SET_CONF_IND 0x53
- #define CCW_CMD_READ_FEAT 0x12
- #define CCW_CMD_WRITE_FEAT 0x11
- #define CCW_CMD_READ_CONF 0x22
- #define CCW_CMD_WRITE_CONF 0x21
- #define CCW_CMD_WRITE_STATUS 0x31
- #define CCW_CMD_READ_VQ_CONF 0x32
- #define CCW_CMD_READ_STATUS 0x72
- #define CCW_CMD_SET_IND_ADAPTER 0x73
- #define CCW_CMD_SET_VIRTIO_REV 0x83
- #define VIRTIO_CCW_DOING_SET_VQ 0x00010000
- #define VIRTIO_CCW_DOING_RESET 0x00040000
- #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000
- #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000
- #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000
- #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000
- #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000
- #define VIRTIO_CCW_DOING_SET_IND 0x01000000
- #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
- #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
- #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000
- #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
- #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000
- #define VIRTIO_CCW_INTPARM_MASK 0xffff0000
- static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
- {
- return container_of(vdev, struct virtio_ccw_device, vdev);
- }
- static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info)
- {
- unsigned long i, flags;
- write_lock_irqsave(&info->lock, flags);
- for (i = 0; i < airq_iv_end(info->aiv); i++) {
- if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) {
- airq_iv_free_bit(info->aiv, i);
- airq_iv_set_ptr(info->aiv, i, 0);
- break;
- }
- }
- write_unlock_irqrestore(&info->lock, flags);
- }
- static void virtio_airq_handler(struct airq_struct *airq,
- struct tpi_info *tpi_info)
- {
- struct airq_info *info = container_of(airq, struct airq_info, airq);
- unsigned long ai;
- inc_irq_stat(IRQIO_VAI);
- read_lock(&info->lock);
- /* Walk through indicators field, summary indicator active. */
- for (ai = 0;;) {
- ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
- if (ai == -1UL)
- break;
- vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
- }
- *(get_summary_indicator(info)) = 0;
- smp_wmb();
- /* Walk through indicators field, summary indicator not active. */
- for (ai = 0;;) {
- ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
- if (ai == -1UL)
- break;
- vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
- }
- read_unlock(&info->lock);
- }
- static struct airq_info *new_airq_info(int index)
- {
- struct airq_info *info;
- int rc;
- info = kzalloc(sizeof(*info), GFP_KERNEL);
- if (!info)
- return NULL;
- rwlock_init(&info->lock);
- info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR
- | AIRQ_IV_CACHELINE, NULL);
- if (!info->aiv) {
- kfree(info);
- return NULL;
- }
- info->airq.handler = virtio_airq_handler;
- info->summary_indicator_idx = index;
- info->airq.lsi_ptr = get_summary_indicator(info);
- info->airq.lsi_mask = 0xff;
- info->airq.isc = VIRTIO_AIRQ_ISC;
- rc = register_adapter_interrupt(&info->airq);
- if (rc) {
- airq_iv_release(info->aiv);
- kfree(info);
- return NULL;
- }
- return info;
- }
- static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs,
- u64 *first, void **airq_info)
- {
- int i, j;
- struct airq_info *info;
- unsigned long indicator_addr = 0;
- unsigned long bit, flags;
- for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) {
- mutex_lock(&airq_areas_lock);
- if (!airq_areas[i])
- airq_areas[i] = new_airq_info(i);
- info = airq_areas[i];
- mutex_unlock(&airq_areas_lock);
- if (!info)
- return 0;
- write_lock_irqsave(&info->lock, flags);
- bit = airq_iv_alloc(info->aiv, nvqs);
- if (bit == -1UL) {
- /* Not enough vacancies. */
- write_unlock_irqrestore(&info->lock, flags);
- continue;
- }
- *first = bit;
- *airq_info = info;
- indicator_addr = (unsigned long)info->aiv->vector;
- for (j = 0; j < nvqs; j++) {
- airq_iv_set_ptr(info->aiv, bit + j,
- (unsigned long)vqs[j]);
- }
- write_unlock_irqrestore(&info->lock, flags);
- }
- return indicator_addr;
- }
- static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev)
- {
- struct virtio_ccw_vq_info *info;
- if (!vcdev->airq_info)
- return;
- list_for_each_entry(info, &vcdev->virtqueues, node)
- drop_airq_indicator(info->vq, vcdev->airq_info);
- }
- static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag)
- {
- unsigned long flags;
- __u32 ret;
- spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
- if (vcdev->err)
- ret = 0;
- else
- ret = vcdev->curr_io & flag;
- spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
- return ret;
- }
- static int ccw_io_helper(struct virtio_ccw_device *vcdev,
- struct ccw1 *ccw, __u32 intparm)
- {
- int ret;
- unsigned long flags;
- int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
- mutex_lock(&vcdev->io_lock);
- do {
- spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
- ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
- if (!ret) {
- if (!vcdev->curr_io)
- vcdev->err = 0;
- vcdev->curr_io |= flag;
- }
- spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
- cpu_relax();
- } while (ret == -EBUSY);
- wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
- ret = ret ? ret : vcdev->err;
- mutex_unlock(&vcdev->io_lock);
- return ret;
- }
- static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
- struct ccw1 *ccw)
- {
- int ret;
- unsigned long *indicatorp = NULL;
- struct virtio_thinint_area *thinint_area = NULL;
- struct airq_info *airq_info = vcdev->airq_info;
- if (vcdev->is_thinint) {
- thinint_area = ccw_device_dma_zalloc(vcdev->cdev,
- sizeof(*thinint_area));
- if (!thinint_area)
- return;
- thinint_area->summary_indicator =
- (unsigned long) get_summary_indicator(airq_info);
- thinint_area->isc = VIRTIO_AIRQ_ISC;
- ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
- ccw->count = sizeof(*thinint_area);
- ccw->cda = (__u32)(unsigned long) thinint_area;
- } else {
- /* payload is the address of the indicators */
- indicatorp = ccw_device_dma_zalloc(vcdev->cdev,
- sizeof(indicators(vcdev)));
- if (!indicatorp)
- return;
- *indicatorp = 0;
- ccw->cmd_code = CCW_CMD_SET_IND;
- ccw->count = sizeof(indicators(vcdev));
- ccw->cda = (__u32)(unsigned long) indicatorp;
- }
- /* Deregister indicators from host. */
- *indicators(vcdev) = 0;
- ccw->flags = 0;
- ret = ccw_io_helper(vcdev, ccw,
- vcdev->is_thinint ?
- VIRTIO_CCW_DOING_SET_IND_ADAPTER :
- VIRTIO_CCW_DOING_SET_IND);
- if (ret && (ret != -ENODEV))
- dev_info(&vcdev->cdev->dev,
- "Failed to deregister indicators (%d)\n", ret);
- else if (vcdev->is_thinint)
- virtio_ccw_drop_indicators(vcdev);
- ccw_device_dma_free(vcdev->cdev, indicatorp, sizeof(indicators(vcdev)));
- ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area));
- }
- static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
- {
- struct virtio_ccw_vq_info *info = vq->priv;
- struct virtio_ccw_device *vcdev;
- struct subchannel_id schid;
- vcdev = to_vc_device(info->vq->vdev);
- ccw_device_get_schid(vcdev->cdev, &schid);
- BUILD_BUG_ON(sizeof(struct subchannel_id) != sizeof(unsigned int));
- info->cookie = kvm_hypercall3(KVM_S390_VIRTIO_CCW_NOTIFY,
- *((unsigned int *)&schid),
- vq->index, info->cookie);
- if (info->cookie < 0)
- return false;
- return true;
- }
- static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
- struct ccw1 *ccw, int index)
- {
- int ret;
- vcdev->dma_area->config_block.index = index;
- ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
- ccw->flags = 0;
- ccw->count = sizeof(struct vq_config_block);
- ccw->cda = (__u32)(unsigned long)(&vcdev->dma_area->config_block);
- ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
- if (ret)
- return ret;
- return vcdev->dma_area->config_block.num ?: -ENOENT;
- }
- static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
- {
- struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
- struct virtio_ccw_vq_info *info = vq->priv;
- unsigned long flags;
- int ret;
- unsigned int index = vq->index;
- /* Remove from our list. */
- spin_lock_irqsave(&vcdev->lock, flags);
- list_del(&info->node);
- spin_unlock_irqrestore(&vcdev->lock, flags);
- /* Release from host. */
- if (vcdev->revision == 0) {
- info->info_block->l.queue = 0;
- info->info_block->l.align = 0;
- info->info_block->l.index = index;
- info->info_block->l.num = 0;
- ccw->count = sizeof(info->info_block->l);
- } else {
- info->info_block->s.desc = 0;
- info->info_block->s.index = index;
- info->info_block->s.num = 0;
- info->info_block->s.avail = 0;
- info->info_block->s.used = 0;
- ccw->count = sizeof(info->info_block->s);
- }
- ccw->cmd_code = CCW_CMD_SET_VQ;
- ccw->flags = 0;
- ccw->cda = (__u32)(unsigned long)(info->info_block);
- ret = ccw_io_helper(vcdev, ccw,
- VIRTIO_CCW_DOING_SET_VQ | index);
- /*
- * -ENODEV isn't considered an error: The device is gone anyway.
- * This may happen on device detach.
- */
- if (ret && (ret != -ENODEV))
- dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n",
- ret, index);
- vring_del_virtqueue(vq);
- ccw_device_dma_free(vcdev->cdev, info->info_block,
- sizeof(*info->info_block));
- kfree(info);
- }
- static void virtio_ccw_del_vqs(struct virtio_device *vdev)
- {
- struct virtqueue *vq, *n;
- struct ccw1 *ccw;
- struct virtio_ccw_device *vcdev = to_vc_device(vdev);
- ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
- if (!ccw)
- return;
- virtio_ccw_drop_indicator(vcdev, ccw);
- list_for_each_entry_safe(vq, n, &vdev->vqs, list)
- virtio_ccw_del_vq(vq, ccw);
- ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
- }
- static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
- int i, vq_callback_t *callback,
- const char *name, bool ctx,
- struct ccw1 *ccw)
- {
- struct virtio_ccw_device *vcdev = to_vc_device(vdev);
- int err;
- struct virtqueue *vq = NULL;
- struct virtio_ccw_vq_info *info;
- u64 queue;
- unsigned long flags;
- bool may_reduce;
- /* Allocate queue. */
- info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
- if (!info) {
- dev_warn(&vcdev->cdev->dev, "no info\n");
- err = -ENOMEM;
- goto out_err;
- }
- info->info_block = ccw_device_dma_zalloc(vcdev->cdev,
- sizeof(*info->info_block));
- if (!info->info_block) {
- dev_warn(&vcdev->cdev->dev, "no info block\n");
- err = -ENOMEM;
- goto out_err;
- }
- info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
- if (info->num < 0) {
- err = info->num;
- goto out_err;
- }
- may_reduce = vcdev->revision > 0;
- vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN,
- vdev, true, may_reduce, ctx,
- virtio_ccw_kvm_notify, callback, name);
- if (!vq) {
- /* For now, we fail if we can't get the requested size. */
- dev_warn(&vcdev->cdev->dev, "no vq\n");
- err = -ENOMEM;
- goto out_err;
- }
- vq->num_max = info->num;
- /* it may have been reduced */
- info->num = virtqueue_get_vring_size(vq);
- /* Register it with the host. */
- queue = virtqueue_get_desc_addr(vq);
- if (vcdev->revision == 0) {
- info->info_block->l.queue = queue;
- info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
- info->info_block->l.index = i;
- info->info_block->l.num = info->num;
- ccw->count = sizeof(info->info_block->l);
- } else {
- info->info_block->s.desc = queue;
- info->info_block->s.index = i;
- info->info_block->s.num = info->num;
- info->info_block->s.avail = (__u64)virtqueue_get_avail_addr(vq);
- info->info_block->s.used = (__u64)virtqueue_get_used_addr(vq);
- ccw->count = sizeof(info->info_block->s);
- }
- ccw->cmd_code = CCW_CMD_SET_VQ;
- ccw->flags = 0;
- ccw->cda = (__u32)(unsigned long)(info->info_block);
- err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
- if (err) {
- dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
- goto out_err;
- }
- info->vq = vq;
- vq->priv = info;
- /* Save it to our list. */
- spin_lock_irqsave(&vcdev->lock, flags);
- list_add(&info->node, &vcdev->virtqueues);
- spin_unlock_irqrestore(&vcdev->lock, flags);
- return vq;
- out_err:
- if (vq)
- vring_del_virtqueue(vq);
- if (info) {
- ccw_device_dma_free(vcdev->cdev, info->info_block,
- sizeof(*info->info_block));
- }
- kfree(info);
- return ERR_PTR(err);
- }
- static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
- struct virtqueue *vqs[], int nvqs,
- struct ccw1 *ccw)
- {
- int ret;
- struct virtio_thinint_area *thinint_area = NULL;
- struct airq_info *info;
- thinint_area = ccw_device_dma_zalloc(vcdev->cdev,
- sizeof(*thinint_area));
- if (!thinint_area) {
- ret = -ENOMEM;
- goto out;
- }
- /* Try to get an indicator. */
- thinint_area->indicator = get_airq_indicator(vqs, nvqs,
- &thinint_area->bit_nr,
- &vcdev->airq_info);
- if (!thinint_area->indicator) {
- ret = -ENOSPC;
- goto out;
- }
- info = vcdev->airq_info;
- thinint_area->summary_indicator =
- (unsigned long) get_summary_indicator(info);
- thinint_area->isc = VIRTIO_AIRQ_ISC;
- ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
- ccw->flags = CCW_FLAG_SLI;
- ccw->count = sizeof(*thinint_area);
- ccw->cda = (__u32)(unsigned long)thinint_area;
- ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
- if (ret) {
- if (ret == -EOPNOTSUPP) {
- /*
- * The host does not support adapter interrupts
- * for virtio-ccw, stop trying.
- */
- virtio_ccw_use_airq = 0;
- pr_info("Adapter interrupts unsupported on host\n");
- } else
- dev_warn(&vcdev->cdev->dev,
- "enabling adapter interrupts = %d\n", ret);
- virtio_ccw_drop_indicators(vcdev);
- }
- out:
- ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area));
- return ret;
- }
- static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
- struct virtqueue *vqs[],
- vq_callback_t *callbacks[],
- const char * const names[],
- const bool *ctx,
- struct irq_affinity *desc)
- {
- struct virtio_ccw_device *vcdev = to_vc_device(vdev);
- unsigned long *indicatorp = NULL;
- int ret, i, queue_idx = 0;
- struct ccw1 *ccw;
- ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
- if (!ccw)
- return -ENOMEM;
- for (i = 0; i < nvqs; ++i) {
- if (!names[i]) {
- vqs[i] = NULL;
- continue;
- }
- vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i],
- names[i], ctx ? ctx[i] : false,
- ccw);
- if (IS_ERR(vqs[i])) {
- ret = PTR_ERR(vqs[i]);
- vqs[i] = NULL;
- goto out;
- }
- }
- ret = -ENOMEM;
- /*
- * We need a data area under 2G to communicate. Our payload is
- * the address of the indicators.
- */
- indicatorp = ccw_device_dma_zalloc(vcdev->cdev,
- sizeof(indicators(vcdev)));
- if (!indicatorp)
- goto out;
- *indicatorp = (unsigned long) indicators(vcdev);
- if (vcdev->is_thinint) {
- ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
- if (ret)
- /* no error, just fall back to legacy interrupts */
- vcdev->is_thinint = false;
- }
- if (!vcdev->is_thinint) {
- /* Register queue indicators with host. */
- *indicators(vcdev) = 0;
- ccw->cmd_code = CCW_CMD_SET_IND;
- ccw->flags = 0;
- ccw->count = sizeof(indicators(vcdev));
- ccw->cda = (__u32)(unsigned long) indicatorp;
- ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
- if (ret)
- goto out;
- }
- /* Register indicators2 with host for config changes */
- *indicatorp = (unsigned long) indicators2(vcdev);
- *indicators2(vcdev) = 0;
- ccw->cmd_code = CCW_CMD_SET_CONF_IND;
- ccw->flags = 0;
- ccw->count = sizeof(indicators2(vcdev));
- ccw->cda = (__u32)(unsigned long) indicatorp;
- ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
- if (ret)
- goto out;
- if (indicatorp)
- ccw_device_dma_free(vcdev->cdev, indicatorp,
- sizeof(indicators(vcdev)));
- ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
- return 0;
- out:
- if (indicatorp)
- ccw_device_dma_free(vcdev->cdev, indicatorp,
- sizeof(indicators(vcdev)));
- ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
- virtio_ccw_del_vqs(vdev);
- return ret;
- }
- static void virtio_ccw_reset(struct virtio_device *vdev)
- {
- struct virtio_ccw_device *vcdev = to_vc_device(vdev);
- struct ccw1 *ccw;
- ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
- if (!ccw)
- return;
- /* Zero status bits. */
- vcdev->dma_area->status = 0;
- /* Send a reset ccw on device. */
- ccw->cmd_code = CCW_CMD_VDEV_RESET;
- ccw->flags = 0;
- ccw->count = 0;
- ccw->cda = 0;
- ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
- ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
- }
- static u64 virtio_ccw_get_features(struct virtio_device *vdev)
- {
- struct virtio_ccw_device *vcdev = to_vc_device(vdev);
- struct virtio_feature_desc *features;
- int ret;
- u64 rc;
- struct ccw1 *ccw;
- ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
- if (!ccw)
- return 0;
- features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features));
- if (!features) {
- rc = 0;
- goto out_free;
- }
- /* Read the feature bits from the host. */
- features->index = 0;
- ccw->cmd_code = CCW_CMD_READ_FEAT;
- ccw->flags = 0;
- ccw->count = sizeof(*features);
- ccw->cda = (__u32)(unsigned long)features;
- ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
- if (ret) {
- rc = 0;
- goto out_free;
- }
- rc = le32_to_cpu(features->features);
- if (vcdev->revision == 0)
- goto out_free;
- /* Read second half of the feature bits from the host. */
- features->index = 1;
- ccw->cmd_code = CCW_CMD_READ_FEAT;
- ccw->flags = 0;
- ccw->count = sizeof(*features);
- ccw->cda = (__u32)(unsigned long)features;
- ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
- if (ret == 0)
- rc |= (u64)le32_to_cpu(features->features) << 32;
- out_free:
- ccw_device_dma_free(vcdev->cdev, features, sizeof(*features));
- ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
- return rc;
- }
- static void ccw_transport_features(struct virtio_device *vdev)
- {
- /*
- * Currently nothing to do here.
- */
- }
- static int virtio_ccw_finalize_features(struct virtio_device *vdev)
- {
- struct virtio_ccw_device *vcdev = to_vc_device(vdev);
- struct virtio_feature_desc *features;
- struct ccw1 *ccw;
- int ret;
- if (vcdev->revision >= 1 &&
- !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
- dev_err(&vdev->dev, "virtio: device uses revision 1 "
- "but does not have VIRTIO_F_VERSION_1\n");
- return -EINVAL;
- }
- ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
- if (!ccw)
- return -ENOMEM;
- features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features));
- if (!features) {
- ret = -ENOMEM;
- goto out_free;
- }
- /* Give virtio_ring a chance to accept features. */
- vring_transport_features(vdev);
- /* Give virtio_ccw a chance to accept features. */
- ccw_transport_features(vdev);
- features->index = 0;
- features->features = cpu_to_le32((u32)vdev->features);
- /* Write the first half of the feature bits to the host. */
- ccw->cmd_code = CCW_CMD_WRITE_FEAT;
- ccw->flags = 0;
- ccw->count = sizeof(*features);
- ccw->cda = (__u32)(unsigned long)features;
- ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
- if (ret)
- goto out_free;
- if (vcdev->revision == 0)
- goto out_free;
- features->index = 1;
- features->features = cpu_to_le32(vdev->features >> 32);
- /* Write the second half of the feature bits to the host. */
- ccw->cmd_code = CCW_CMD_WRITE_FEAT;
- ccw->flags = 0;
- ccw->count = sizeof(*features);
- ccw->cda = (__u32)(unsigned long)features;
- ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
- out_free:
- ccw_device_dma_free(vcdev->cdev, features, sizeof(*features));
- ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
- return ret;
- }
- static void virtio_ccw_get_config(struct virtio_device *vdev,
- unsigned int offset, void *buf, unsigned len)
- {
- struct virtio_ccw_device *vcdev = to_vc_device(vdev);
- int ret;
- struct ccw1 *ccw;
- void *config_area;
- unsigned long flags;
- ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
- if (!ccw)
- return;
- config_area = ccw_device_dma_zalloc(vcdev->cdev,
- VIRTIO_CCW_CONFIG_SIZE);
- if (!config_area)
- goto out_free;
- /* Read the config area from the host. */
- ccw->cmd_code = CCW_CMD_READ_CONF;
- ccw->flags = 0;
- ccw->count = offset + len;
- ccw->cda = (__u32)(unsigned long)config_area;
- ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
- if (ret)
- goto out_free;
- spin_lock_irqsave(&vcdev->lock, flags);
- memcpy(vcdev->config, config_area, offset + len);
- if (vcdev->config_ready < offset + len)
- vcdev->config_ready = offset + len;
- spin_unlock_irqrestore(&vcdev->lock, flags);
- if (buf)
- memcpy(buf, config_area + offset, len);
- out_free:
- ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE);
- ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
- }
- static void virtio_ccw_set_config(struct virtio_device *vdev,
- unsigned int offset, const void *buf,
- unsigned len)
- {
- struct virtio_ccw_device *vcdev = to_vc_device(vdev);
- struct ccw1 *ccw;
- void *config_area;
- unsigned long flags;
- ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
- if (!ccw)
- return;
- config_area = ccw_device_dma_zalloc(vcdev->cdev,
- VIRTIO_CCW_CONFIG_SIZE);
- if (!config_area)
- goto out_free;
- /* Make sure we don't overwrite fields. */
- if (vcdev->config_ready < offset)
- virtio_ccw_get_config(vdev, 0, NULL, offset);
- spin_lock_irqsave(&vcdev->lock, flags);
- memcpy(&vcdev->config[offset], buf, len);
- /* Write the config area to the host. */
- memcpy(config_area, vcdev->config, sizeof(vcdev->config));
- spin_unlock_irqrestore(&vcdev->lock, flags);
- ccw->cmd_code = CCW_CMD_WRITE_CONF;
- ccw->flags = 0;
- ccw->count = offset + len;
- ccw->cda = (__u32)(unsigned long)config_area;
- ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
- out_free:
- ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE);
- ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
- }
- static u8 virtio_ccw_get_status(struct virtio_device *vdev)
- {
- struct virtio_ccw_device *vcdev = to_vc_device(vdev);
- u8 old_status = vcdev->dma_area->status;
- struct ccw1 *ccw;
- if (vcdev->revision < 2)
- return vcdev->dma_area->status;
- ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
- if (!ccw)
- return old_status;
- ccw->cmd_code = CCW_CMD_READ_STATUS;
- ccw->flags = 0;
- ccw->count = sizeof(vcdev->dma_area->status);
- ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status;
- ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS);
- /*
- * If the channel program failed (should only happen if the device
- * was hotunplugged, and then we clean up via the machine check
- * handler anyway), vcdev->dma_area->status was not overwritten and we just
- * return the old status, which is fine.
- */
- ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
- return vcdev->dma_area->status;
- }
- static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
- {
- struct virtio_ccw_device *vcdev = to_vc_device(vdev);
- u8 old_status = vcdev->dma_area->status;
- struct ccw1 *ccw;
- int ret;
- ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
- if (!ccw)
- return;
- /* Write the status to the host. */
- vcdev->dma_area->status = status;
- ccw->cmd_code = CCW_CMD_WRITE_STATUS;
- ccw->flags = 0;
- ccw->count = sizeof(status);
- ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status;
- /* We use ssch for setting the status which is a serializing
- * instruction that guarantees the memory writes have
- * completed before ssch.
- */
- ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
- /* Write failed? We assume status is unchanged. */
- if (ret)
- vcdev->dma_area->status = old_status;
- ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
- }
- static const char *virtio_ccw_bus_name(struct virtio_device *vdev)
- {
- struct virtio_ccw_device *vcdev = to_vc_device(vdev);
- return dev_name(&vcdev->cdev->dev);
- }
- static void virtio_ccw_synchronize_cbs(struct virtio_device *vdev)
- {
- struct virtio_ccw_device *vcdev = to_vc_device(vdev);
- struct airq_info *info = vcdev->airq_info;
- if (info) {
- /*
- * This device uses adapter interrupts: synchronize with
- * vring_interrupt() called by virtio_airq_handler()
- * via the indicator area lock.
- */
- write_lock_irq(&info->lock);
- write_unlock_irq(&info->lock);
- } else {
- /* This device uses classic interrupts: synchronize
- * with vring_interrupt() called by
- * virtio_ccw_int_handler() via the per-device
- * irq_lock
- */
- write_lock_irq(&vcdev->irq_lock);
- write_unlock_irq(&vcdev->irq_lock);
- }
- }
- static const struct virtio_config_ops virtio_ccw_config_ops = {
- .get_features = virtio_ccw_get_features,
- .finalize_features = virtio_ccw_finalize_features,
- .get = virtio_ccw_get_config,
- .set = virtio_ccw_set_config,
- .get_status = virtio_ccw_get_status,
- .set_status = virtio_ccw_set_status,
- .reset = virtio_ccw_reset,
- .find_vqs = virtio_ccw_find_vqs,
- .del_vqs = virtio_ccw_del_vqs,
- .bus_name = virtio_ccw_bus_name,
- .synchronize_cbs = virtio_ccw_synchronize_cbs,
- };
- /*
- * ccw bus driver related functions
- */
- static void virtio_ccw_release_dev(struct device *_d)
- {
- struct virtio_device *dev = dev_to_virtio(_d);
- struct virtio_ccw_device *vcdev = to_vc_device(dev);
- ccw_device_dma_free(vcdev->cdev, vcdev->dma_area,
- sizeof(*vcdev->dma_area));
- kfree(vcdev);
- }
- static int irb_is_error(struct irb *irb)
- {
- if (scsw_cstat(&irb->scsw) != 0)
- return 1;
- if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
- return 1;
- if (scsw_cc(&irb->scsw) != 0)
- return 1;
- return 0;
- }
- static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
- int index)
- {
- struct virtio_ccw_vq_info *info;
- unsigned long flags;
- struct virtqueue *vq;
- vq = NULL;
- spin_lock_irqsave(&vcdev->lock, flags);
- list_for_each_entry(info, &vcdev->virtqueues, node) {
- if (info->vq->index == index) {
- vq = info->vq;
- break;
- }
- }
- spin_unlock_irqrestore(&vcdev->lock, flags);
- return vq;
- }
- static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev,
- __u32 activity)
- {
- if (vcdev->curr_io & activity) {
- switch (activity) {
- case VIRTIO_CCW_DOING_READ_FEAT:
- case VIRTIO_CCW_DOING_WRITE_FEAT:
- case VIRTIO_CCW_DOING_READ_CONFIG:
- case VIRTIO_CCW_DOING_WRITE_CONFIG:
- case VIRTIO_CCW_DOING_WRITE_STATUS:
- case VIRTIO_CCW_DOING_READ_STATUS:
- case VIRTIO_CCW_DOING_SET_VQ:
- case VIRTIO_CCW_DOING_SET_IND:
- case VIRTIO_CCW_DOING_SET_CONF_IND:
- case VIRTIO_CCW_DOING_RESET:
- case VIRTIO_CCW_DOING_READ_VQ_CONF:
- case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
- case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
- vcdev->curr_io &= ~activity;
- wake_up(&vcdev->wait_q);
- break;
- default:
- /* don't know what to do... */
- dev_warn(&vcdev->cdev->dev,
- "Suspicious activity '%08x'\n", activity);
- WARN_ON(1);
- break;
- }
- }
- }
- static void virtio_ccw_int_handler(struct ccw_device *cdev,
- unsigned long intparm,
- struct irb *irb)
- {
- __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
- struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
- int i;
- struct virtqueue *vq;
- if (!vcdev)
- return;
- if (IS_ERR(irb)) {
- vcdev->err = PTR_ERR(irb);
- virtio_ccw_check_activity(vcdev, activity);
- /* Don't poke around indicators, something's wrong. */
- return;
- }
- /* Check if it's a notification from the host. */
- if ((intparm == 0) &&
- (scsw_stctl(&irb->scsw) ==
- (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
- /* OK */
- }
- if (irb_is_error(irb)) {
- /* Command reject? */
- if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
- (irb->ecw[0] & SNS0_CMD_REJECT))
- vcdev->err = -EOPNOTSUPP;
- else
- /* Map everything else to -EIO. */
- vcdev->err = -EIO;
- }
- virtio_ccw_check_activity(vcdev, activity);
- #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
- /*
- * Paired with virtio_ccw_synchronize_cbs() and interrupts are
- * disabled here.
- */
- read_lock(&vcdev->irq_lock);
- #endif
- for_each_set_bit(i, indicators(vcdev),
- sizeof(*indicators(vcdev)) * BITS_PER_BYTE) {
- /* The bit clear must happen before the vring kick. */
- clear_bit(i, indicators(vcdev));
- barrier();
- vq = virtio_ccw_vq_by_ind(vcdev, i);
- vring_interrupt(0, vq);
- }
- #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
- read_unlock(&vcdev->irq_lock);
- #endif
- if (test_bit(0, indicators2(vcdev))) {
- virtio_config_changed(&vcdev->vdev);
- clear_bit(0, indicators2(vcdev));
- }
- }
- /*
- * We usually want to autoonline all devices, but give the admin
- * a way to exempt devices from this.
- */
- #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
- (8*sizeof(long)))
- static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
- static char *no_auto = "";
- module_param(no_auto, charp, 0444);
- MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
- static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
- {
- struct ccw_dev_id id;
- ccw_device_get_id(cdev, &id);
- if (test_bit(id.devno, devs_no_auto[id.ssid]))
- return 0;
- return 1;
- }
- static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
- {
- struct ccw_device *cdev = data;
- int ret;
- ret = ccw_device_set_online(cdev);
- if (ret)
- dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
- }
- static int virtio_ccw_probe(struct ccw_device *cdev)
- {
- cdev->handler = virtio_ccw_int_handler;
- if (virtio_ccw_check_autoonline(cdev))
- async_schedule(virtio_ccw_auto_online, cdev);
- return 0;
- }
- static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
- {
- unsigned long flags;
- struct virtio_ccw_device *vcdev;
- spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
- vcdev = dev_get_drvdata(&cdev->dev);
- if (!vcdev || vcdev->going_away) {
- spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
- return NULL;
- }
- vcdev->going_away = true;
- spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
- return vcdev;
- }
- static void virtio_ccw_remove(struct ccw_device *cdev)
- {
- unsigned long flags;
- struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
- if (vcdev && cdev->online) {
- if (vcdev->device_lost)
- virtio_break_device(&vcdev->vdev);
- unregister_virtio_device(&vcdev->vdev);
- spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
- dev_set_drvdata(&cdev->dev, NULL);
- spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
- }
- cdev->handler = NULL;
- }
- static int virtio_ccw_offline(struct ccw_device *cdev)
- {
- unsigned long flags;
- struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
- if (!vcdev)
- return 0;
- if (vcdev->device_lost)
- virtio_break_device(&vcdev->vdev);
- unregister_virtio_device(&vcdev->vdev);
- spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
- dev_set_drvdata(&cdev->dev, NULL);
- spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
- return 0;
- }
- static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
- {
- struct virtio_rev_info *rev;
- struct ccw1 *ccw;
- int ret;
- ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
- if (!ccw)
- return -ENOMEM;
- rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev));
- if (!rev) {
- ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
- return -ENOMEM;
- }
- /* Set transport revision */
- ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
- ccw->flags = 0;
- ccw->count = sizeof(*rev);
- ccw->cda = (__u32)(unsigned long)rev;
- vcdev->revision = VIRTIO_CCW_REV_MAX;
- do {
- rev->revision = vcdev->revision;
- /* none of our supported revisions carry payload */
- rev->length = 0;
- ret = ccw_io_helper(vcdev, ccw,
- VIRTIO_CCW_DOING_SET_VIRTIO_REV);
- if (ret == -EOPNOTSUPP) {
- if (vcdev->revision == 0)
- /*
- * The host device does not support setting
- * the revision: let's operate it in legacy
- * mode.
- */
- ret = 0;
- else
- vcdev->revision--;
- }
- } while (ret == -EOPNOTSUPP);
- ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
- ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev));
- return ret;
- }
- static int virtio_ccw_online(struct ccw_device *cdev)
- {
- int ret;
- struct virtio_ccw_device *vcdev;
- unsigned long flags;
- vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
- if (!vcdev) {
- dev_warn(&cdev->dev, "Could not get memory for virtio\n");
- ret = -ENOMEM;
- goto out_free;
- }
- vcdev->vdev.dev.parent = &cdev->dev;
- vcdev->cdev = cdev;
- vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev,
- sizeof(*vcdev->dma_area));
- if (!vcdev->dma_area) {
- ret = -ENOMEM;
- goto out_free;
- }
- vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
- vcdev->vdev.dev.release = virtio_ccw_release_dev;
- vcdev->vdev.config = &virtio_ccw_config_ops;
- init_waitqueue_head(&vcdev->wait_q);
- INIT_LIST_HEAD(&vcdev->virtqueues);
- spin_lock_init(&vcdev->lock);
- rwlock_init(&vcdev->irq_lock);
- mutex_init(&vcdev->io_lock);
- spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
- dev_set_drvdata(&cdev->dev, vcdev);
- spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
- vcdev->vdev.id.vendor = cdev->id.cu_type;
- vcdev->vdev.id.device = cdev->id.cu_model;
- ret = virtio_ccw_set_transport_rev(vcdev);
- if (ret)
- goto out_free;
- ret = register_virtio_device(&vcdev->vdev);
- if (ret) {
- dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
- ret);
- goto out_put;
- }
- return 0;
- out_put:
- spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
- dev_set_drvdata(&cdev->dev, NULL);
- spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
- put_device(&vcdev->vdev.dev);
- return ret;
- out_free:
- if (vcdev) {
- ccw_device_dma_free(vcdev->cdev, vcdev->dma_area,
- sizeof(*vcdev->dma_area));
- }
- kfree(vcdev);
- return ret;
- }
- static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
- {
- int rc;
- struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
- /*
- * Make sure vcdev is set
- * i.e. set_offline/remove callback not already running
- */
- if (!vcdev)
- return NOTIFY_DONE;
- switch (event) {
- case CIO_GONE:
- vcdev->device_lost = true;
- rc = NOTIFY_DONE;
- break;
- case CIO_OPER:
- rc = NOTIFY_OK;
- break;
- default:
- rc = NOTIFY_DONE;
- break;
- }
- return rc;
- }
- static struct ccw_device_id virtio_ids[] = {
- { CCW_DEVICE(0x3832, 0) },
- {},
- };
- static struct ccw_driver virtio_ccw_driver = {
- .driver = {
- .owner = THIS_MODULE,
- .name = "virtio_ccw",
- },
- .ids = virtio_ids,
- .probe = virtio_ccw_probe,
- .remove = virtio_ccw_remove,
- .set_offline = virtio_ccw_offline,
- .set_online = virtio_ccw_online,
- .notify = virtio_ccw_cio_notify,
- .int_class = IRQIO_VIR,
- };
- static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
- int max_digit, int max_val)
- {
- int diff;
- diff = 0;
- *val = 0;
- while (diff <= max_digit) {
- int value = hex_to_bin(**cp);
- if (value < 0)
- break;
- *val = *val * 16 + value;
- (*cp)++;
- diff++;
- }
- if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
- return 1;
- return 0;
- }
- static int __init parse_busid(char *str, unsigned int *cssid,
- unsigned int *ssid, unsigned int *devno)
- {
- char *str_work;
- int rc, ret;
- rc = 1;
- if (*str == '\0')
- goto out;
- str_work = str;
- ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
- if (ret || (str_work[0] != '.'))
- goto out;
- str_work++;
- ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
- if (ret || (str_work[0] != '.'))
- goto out;
- str_work++;
- ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
- if (ret || (str_work[0] != '\0'))
- goto out;
- rc = 0;
- out:
- return rc;
- }
- static void __init no_auto_parse(void)
- {
- unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
- char *parm, *str;
- int rc;
- str = no_auto;
- while ((parm = strsep(&str, ","))) {
- rc = parse_busid(strsep(&parm, "-"), &from_cssid,
- &from_ssid, &from);
- if (rc)
- continue;
- if (parm != NULL) {
- rc = parse_busid(parm, &to_cssid,
- &to_ssid, &to);
- if ((from_ssid > to_ssid) ||
- ((from_ssid == to_ssid) && (from > to)))
- rc = -EINVAL;
- } else {
- to_cssid = from_cssid;
- to_ssid = from_ssid;
- to = from;
- }
- if (rc)
- continue;
- while ((from_ssid < to_ssid) ||
- ((from_ssid == to_ssid) && (from <= to))) {
- set_bit(from, devs_no_auto[from_ssid]);
- from++;
- if (from > __MAX_SUBCHANNEL) {
- from_ssid++;
- from = 0;
- }
- }
- }
- }
- static int __init virtio_ccw_init(void)
- {
- int rc;
- /* parse no_auto string before we do anything further */
- no_auto_parse();
- summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS);
- if (!summary_indicators)
- return -ENOMEM;
- rc = ccw_driver_register(&virtio_ccw_driver);
- if (rc)
- cio_dma_free(summary_indicators, MAX_AIRQ_AREAS);
- return rc;
- }
- device_initcall(virtio_ccw_init);
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