diff options
Diffstat (limited to 'drivers/s390/kvm')
| -rw-r--r-- | drivers/s390/kvm/Makefile | 9 | ||||
| -rw-r--r-- | drivers/s390/kvm/kvm_virtio.c | 510 | ||||
| -rw-r--r-- | drivers/s390/kvm/virtio_ccw.c | 1380 |
3 files changed, 0 insertions, 1899 deletions
diff --git a/drivers/s390/kvm/Makefile b/drivers/s390/kvm/Makefile deleted file mode 100644 index 241891a..0000000 --- a/drivers/s390/kvm/Makefile +++ /dev/null @@ -1,9 +0,0 @@ -# Makefile for kvm guest drivers on s390 -# -# Copyright IBM Corp. 2008 -# -# This program is free software; you can redistribute it and/or modify -# it under the terms of the GNU General Public License (version 2 only) -# as published by the Free Software Foundation. - -obj-$(CONFIG_S390_GUEST) += kvm_virtio.o virtio_ccw.o diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c deleted file mode 100644 index dd65c8b..0000000 --- a/drivers/s390/kvm/kvm_virtio.c +++ /dev/null @@ -1,510 +0,0 @@ -/* - * virtio for kvm on s390 - * - * Copyright IBM Corp. 2008 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License (version 2 only) - * as published by the Free Software Foundation. - * - * Author(s): Christian Borntraeger <borntraeger@de.ibm.com> - */ - -#include <linux/kernel_stat.h> -#include <linux/init.h> -#include <linux/bootmem.h> -#include <linux/err.h> -#include <linux/virtio.h> -#include <linux/virtio_config.h> -#include <linux/slab.h> -#include <linux/virtio_console.h> -#include <linux/interrupt.h> -#include <linux/virtio_ring.h> -#include <linux/export.h> -#include <linux/pfn.h> -#include <asm/io.h> -#include <asm/kvm_para.h> -#include <asm/kvm_virtio.h> -#include <asm/sclp.h> -#include <asm/setup.h> -#include <asm/irq.h> - -#define VIRTIO_SUBCODE_64 0x0D00 - -/* - * The pointer to our (page) of device descriptions. - */ -static void *kvm_devices; -static struct work_struct hotplug_work; - -struct kvm_device { - struct virtio_device vdev; - struct kvm_device_desc *desc; -}; - -#define to_kvmdev(vd) container_of(vd, struct kvm_device, vdev) - -/* - * memory layout: - * - kvm_device_descriptor - * struct kvm_device_desc - * - configuration - * struct kvm_vqconfig - * - feature bits - * - config space - */ -static struct kvm_vqconfig *kvm_vq_config(const struct kvm_device_desc *desc) -{ - return (struct kvm_vqconfig *)(desc + 1); -} - -static u8 *kvm_vq_features(const struct kvm_device_desc *desc) -{ - return (u8 *)(kvm_vq_config(desc) + desc->num_vq); -} - -static u8 *kvm_vq_configspace(const struct kvm_device_desc *desc) -{ - return kvm_vq_features(desc) + desc->feature_len * 2; -} - -/* - * The total size of the config page used by this device (incl. desc) - */ -static unsigned desc_size(const struct kvm_device_desc *desc) -{ - return sizeof(*desc) - + desc->num_vq * sizeof(struct kvm_vqconfig) - + desc->feature_len * 2 - + desc->config_len; -} - -/* This gets the device's feature bits. */ -static u64 kvm_get_features(struct virtio_device *vdev) -{ - unsigned int i; - u32 features = 0; - struct kvm_device_desc *desc = to_kvmdev(vdev)->desc; - u8 *in_features = kvm_vq_features(desc); - - for (i = 0; i < min(desc->feature_len * 8, 32); i++) - if (in_features[i / 8] & (1 << (i % 8))) - features |= (1 << i); - return features; -} - -static int kvm_finalize_features(struct virtio_device *vdev) -{ - unsigned int i, bits; - struct kvm_device_desc *desc = to_kvmdev(vdev)->desc; - /* Second half of bitmap is features we accept. */ - u8 *out_features = kvm_vq_features(desc) + desc->feature_len; - - /* Give virtio_ring a chance to accept features. */ - vring_transport_features(vdev); - - /* Make sure we don't have any features > 32 bits! */ - BUG_ON((u32)vdev->features != vdev->features); - - memset(out_features, 0, desc->feature_len); - bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8; - for (i = 0; i < bits; i++) { - if (__virtio_test_bit(vdev, i)) - out_features[i / 8] |= (1 << (i % 8)); - } - - return 0; -} - -/* - * Reading and writing elements in config space - */ -static void kvm_get(struct virtio_device *vdev, unsigned int offset, - void *buf, unsigned len) -{ - struct kvm_device_desc *desc = to_kvmdev(vdev)->desc; - - BUG_ON(offset + len > desc->config_len); - memcpy(buf, kvm_vq_configspace(desc) + offset, len); -} - -static void kvm_set(struct virtio_device *vdev, unsigned int offset, - const void *buf, unsigned len) -{ - struct kvm_device_desc *desc = to_kvmdev(vdev)->desc; - - BUG_ON(offset + len > desc->config_len); - memcpy(kvm_vq_configspace(desc) + offset, buf, len); -} - -/* - * The operations to get and set the status word just access - * the status field of the device descriptor. set_status will also - * make a hypercall to the host, to tell about status changes - */ -static u8 kvm_get_status(struct virtio_device *vdev) -{ - return to_kvmdev(vdev)->desc->status; -} - -static void kvm_set_status(struct virtio_device *vdev, u8 status) -{ - BUG_ON(!status); - to_kvmdev(vdev)->desc->status = status; - kvm_hypercall1(KVM_S390_VIRTIO_SET_STATUS, - (unsigned long) to_kvmdev(vdev)->desc); -} - -/* - * To reset the device, we use the KVM_VIRTIO_RESET hypercall, using the - * descriptor address. The Host will zero the status and all the - * features. - */ -static void kvm_reset(struct virtio_device *vdev) -{ - kvm_hypercall1(KVM_S390_VIRTIO_RESET, - (unsigned long) to_kvmdev(vdev)->desc); -} - -/* - * When the virtio_ring code wants to notify the Host, it calls us here and we - * make a hypercall. We hand the address of the virtqueue so the Host - * knows which virtqueue we're talking about. - */ -static bool kvm_notify(struct virtqueue *vq) -{ - long rc; - struct kvm_vqconfig *config = vq->priv; - - rc = kvm_hypercall1(KVM_S390_VIRTIO_NOTIFY, config->address); - if (rc < 0) - return false; - return true; -} - -/* - * This routine finds the first virtqueue described in the configuration of - * this device and sets it up. - */ -static struct virtqueue *kvm_find_vq(struct virtio_device *vdev, - unsigned index, - void (*callback)(struct virtqueue *vq), - const char *name) -{ - struct kvm_device *kdev = to_kvmdev(vdev); - struct kvm_vqconfig *config; - struct virtqueue *vq; - int err; - - if (index >= kdev->desc->num_vq) - return ERR_PTR(-ENOENT); - - if (!name) - return NULL; - - config = kvm_vq_config(kdev->desc)+index; - - err = vmem_add_mapping(config->address, - vring_size(config->num, - KVM_S390_VIRTIO_RING_ALIGN)); - if (err) - goto out; - - vq = vring_new_virtqueue(index, config->num, KVM_S390_VIRTIO_RING_ALIGN, - vdev, true, (void *) config->address, - kvm_notify, callback, name); - if (!vq) { - err = -ENOMEM; - goto unmap; - } - - /* - * register a callback token - * The host will sent this via the external interrupt parameter - */ - config->token = (u64) vq; - - vq->priv = config; - return vq; -unmap: - vmem_remove_mapping(config->address, - vring_size(config->num, - KVM_S390_VIRTIO_RING_ALIGN)); -out: - return ERR_PTR(err); -} - -static void kvm_del_vq(struct virtqueue *vq) -{ - struct kvm_vqconfig *config = vq->priv; - - vring_del_virtqueue(vq); - vmem_remove_mapping(config->address, - vring_size(config->num, - KVM_S390_VIRTIO_RING_ALIGN)); -} - -static void kvm_del_vqs(struct virtio_device *vdev) -{ - struct virtqueue *vq, *n; - - list_for_each_entry_safe(vq, n, &vdev->vqs, list) - kvm_del_vq(vq); -} - -static int kvm_find_vqs(struct virtio_device *vdev, unsigned nvqs, - struct virtqueue *vqs[], - vq_callback_t *callbacks[], - const char *names[]) -{ - struct kvm_device *kdev = to_kvmdev(vdev); - int i; - - /* We must have this many virtqueues. */ - if (nvqs > kdev->desc->num_vq) - return -ENOENT; - - for (i = 0; i < nvqs; ++i) { - vqs[i] = kvm_find_vq(vdev, i, callbacks[i], names[i]); - if (IS_ERR(vqs[i])) - goto error; - } - return 0; - -error: - kvm_del_vqs(vdev); - return PTR_ERR(vqs[i]); -} - -static const char *kvm_bus_name(struct virtio_device *vdev) -{ - return ""; -} - -/* - * The config ops structure as defined by virtio config - */ -static const struct virtio_config_ops kvm_vq_configspace_ops = { - .get_features = kvm_get_features, - .finalize_features = kvm_finalize_features, - .get = kvm_get, - .set = kvm_set, - .get_status = kvm_get_status, - .set_status = kvm_set_status, - .reset = kvm_reset, - .find_vqs = kvm_find_vqs, - .del_vqs = kvm_del_vqs, - .bus_name = kvm_bus_name, -}; - -/* - * The root device for the kvm virtio devices. - * This makes them appear as /sys/devices/kvm_s390/0,1,2 not /sys/devices/0,1,2. - */ -static struct device *kvm_root; - -/* - * adds a new device and register it with virtio - * appropriate drivers are loaded by the device model - */ -static void add_kvm_device(struct kvm_device_desc *d, unsigned int offset) -{ - struct kvm_device *kdev; - - kdev = kzalloc(sizeof(*kdev), GFP_KERNEL); - if (!kdev) { - printk(KERN_EMERG "Cannot allocate kvm dev %u type %u\n", - offset, d->type); - return; - } - - kdev->vdev.dev.parent = kvm_root; - kdev->vdev.id.device = d->type; - kdev->vdev.config = &kvm_vq_configspace_ops; - kdev->desc = d; - - if (register_virtio_device(&kdev->vdev) != 0) { - printk(KERN_ERR "Failed to register kvm device %u type %u\n", - offset, d->type); - kfree(kdev); - } -} - -/* - * scan_devices() simply iterates through the device page. - * The type 0 is reserved to mean "end of devices". - */ -static void scan_devices(void) -{ - unsigned int i; - struct kvm_device_desc *d; - - for (i = 0; i < PAGE_SIZE; i += desc_size(d)) { - d = kvm_devices + i; - - if (d->type == 0) - break; - - add_kvm_device(d, i); - } -} - -/* - * match for a kvm device with a specific desc pointer - */ -static int match_desc(struct device *dev, void *data) -{ - struct virtio_device *vdev = dev_to_virtio(dev); - struct kvm_device *kdev = to_kvmdev(vdev); - - return kdev->desc == data; -} - -/* - * hotplug_device tries to find changes in the device page. - */ -static void hotplug_devices(struct work_struct *dummy) -{ - unsigned int i; - struct kvm_device_desc *d; - struct device *dev; - - for (i = 0; i < PAGE_SIZE; i += desc_size(d)) { - d = kvm_devices + i; - - /* end of list */ - if (d->type == 0) - break; - - /* device already exists */ - dev = device_find_child(kvm_root, d, match_desc); - if (dev) { - /* XXX check for hotplug remove */ - put_device(dev); - continue; - } - - /* new device */ - printk(KERN_INFO "Adding new virtio device %p\n", d); - add_kvm_device(d, i); - } -} - -/* - * we emulate the request_irq behaviour on top of s390 extints - */ -static void kvm_extint_handler(struct ext_code ext_code, - unsigned int param32, unsigned long param64) -{ - struct virtqueue *vq; - u32 param; - - if ((ext_code.subcode & 0xff00) != VIRTIO_SUBCODE_64) - return; - inc_irq_stat(IRQEXT_VRT); - - /* The LSB might be overloaded, we have to mask it */ - vq = (struct virtqueue *)(param64 & ~1UL); - - /* We use ext_params to decide what this interrupt means */ - param = param32 & VIRTIO_PARAM_MASK; - - switch (param) { - case VIRTIO_PARAM_CONFIG_CHANGED: - virtio_config_changed(vq->vdev); - break; - case VIRTIO_PARAM_DEV_ADD: - schedule_work(&hotplug_work); - break; - case VIRTIO_PARAM_VRING_INTERRUPT: - default: - vring_interrupt(0, vq); - break; - } -} - -/* - * For s390-virtio, we expect a page above main storage containing - * the virtio configuration. Try to actually load from this area - * in order to figure out if the host provides this page. - */ -static int __init test_devices_support(unsigned long addr) -{ - int ret = -EIO; - - asm volatile( - "0: lura 0,%1\n" - "1: xgr %0,%0\n" - "2:\n" - EX_TABLE(0b,2b) - EX_TABLE(1b,2b) - : "+d" (ret) - : "a" (addr) - : "0", "cc"); - return ret; -} -/* - * Init function for virtio - * devices are in a single page above top of "normal" + standby mem - */ -static int __init kvm_devices_init(void) -{ - int rc; - unsigned long total_memory_size = sclp_get_rzm() * sclp_get_rnmax(); - - if (!MACHINE_IS_KVM) - return -ENODEV; - - if (test_devices_support(total_memory_size) < 0) - return -ENODEV; - - rc = vmem_add_mapping(total_memory_size, PAGE_SIZE); - if (rc) - return rc; - - kvm_devices = (void *) total_memory_size; - - kvm_root = root_device_register("kvm_s390"); - if (IS_ERR(kvm_root)) { - rc = PTR_ERR(kvm_root); - printk(KERN_ERR "Could not register kvm_s390 root device"); - vmem_remove_mapping(total_memory_size, PAGE_SIZE); - return rc; - } - - INIT_WORK(&hotplug_work, hotplug_devices); - - irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); - register_external_irq(EXT_IRQ_CP_SERVICE, kvm_extint_handler); - - scan_devices(); - return 0; -} - -/* code for early console output with virtio_console */ -static __init int early_put_chars(u32 vtermno, const char *buf, int count) -{ - char scratch[17]; - unsigned int len = count; - - if (len > sizeof(scratch) - 1) - len = sizeof(scratch) - 1; - scratch[len] = '\0'; - memcpy(scratch, buf, len); - kvm_hypercall1(KVM_S390_VIRTIO_NOTIFY, __pa(scratch)); - return len; -} - -static int __init s390_virtio_console_init(void) -{ - if (sclp_has_vt220() || sclp_has_linemode()) - return -ENODEV; - return virtio_cons_early_init(early_put_chars); -} -console_initcall(s390_virtio_console_init); - - -/* - * We do this after core stuff, but before the drivers. - */ -postcore_initcall(kvm_devices_init); diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c deleted file mode 100644 index 6f1fa17..0000000 --- a/drivers/s390/kvm/virtio_ccw.c +++ /dev/null @@ -1,1380 +0,0 @@ -/* - * ccw based virtio transport - * - * Copyright IBM Corp. 2012, 2014 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License (version 2 only) - * as published by the Free Software Foundation. - * - * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> - */ - -#include <linux/kernel_stat.h> -#include <linux/init.h> -#include <linux/bootmem.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/module.h> -#include <linux/io.h> -#include <linux/kvm_para.h> -#include <linux/notifier.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> - -/* - * 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 virtio_ccw_device { - struct virtio_device vdev; - __u8 *status; - __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; - struct list_head virtqueues; - unsigned long indicators; - unsigned long indicators2; - struct vq_config_block *config_block; - bool is_thinint; - bool going_away; - bool device_lost; - void *airq_info; -}; - -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 { - __u32 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 1 - -struct virtio_ccw_vq_info { - struct virtqueue *vq; - int num; - void *queue; - 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; - struct airq_struct airq; - struct airq_iv *aiv; -}; -static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; - -#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_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_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 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)); - } - info->summary_indicator = 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(void) -{ - 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); - if (!info->aiv) { - kfree(info); - return NULL; - } - info->airq.handler = virtio_airq_handler; - info->airq.lsi_ptr = &info->summary_indicator; - 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 void destroy_airq_info(struct airq_info *info) -{ - if (!info) - return; - - unregister_adapter_interrupt(&info->airq); - airq_iv_release(info->aiv); - kfree(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++) { - if (!airq_areas[i]) - airq_areas[i] = new_airq_info(); - info = airq_areas[i]; - 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; - - 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; - - 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); - return ret ? ret : vcdev->err; -} - -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 = kzalloc(sizeof(*thinint_area), - GFP_DMA | GFP_KERNEL); - if (!thinint_area) - return; - thinint_area->summary_indicator = - (unsigned long) &airq_info->summary_indicator; - 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 { - indicatorp = kmalloc(sizeof(&vcdev->indicators), - GFP_DMA | GFP_KERNEL); - if (!indicatorp) - return; - *indicatorp = 0; - ccw->cmd_code = CCW_CMD_SET_IND; - ccw->count = sizeof(vcdev->indicators); - ccw->cda = (__u32)(unsigned long) indicatorp; - } - /* Deregister indicators from host. */ - vcdev->indicators = 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); - kfree(indicatorp); - kfree(thinint_area); -} - -static inline long do_kvm_notify(struct subchannel_id schid, - unsigned long queue_index, - long cookie) -{ - register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY; - register struct subchannel_id __schid asm("2") = schid; - register unsigned long __index asm("3") = queue_index; - register long __rc asm("2"); - register long __cookie asm("4") = cookie; - - asm volatile ("diag 2,4,0x500\n" - : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index), - "d"(__cookie) - : "memory", "cc"); - return __rc; -} - -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); - info->cookie = do_kvm_notify(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) -{ - vcdev->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->config_block); - ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); - return vcdev->config_block->num; -} - -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; - unsigned long size; - 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", - ret, index); - - vring_del_virtqueue(vq); - size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); - free_pages_exact(info->queue, size); - kfree(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 = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); - 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); - - kfree(ccw); -} - -static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, - int i, vq_callback_t *callback, - const char *name, - struct ccw1 *ccw) -{ - struct virtio_ccw_device *vcdev = to_vc_device(vdev); - int err; - struct virtqueue *vq = NULL; - struct virtio_ccw_vq_info *info; - unsigned long size = 0; /* silence the compiler */ - unsigned long flags; - - /* 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 = kzalloc(sizeof(*info->info_block), - GFP_DMA | GFP_KERNEL); - 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); - size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); - info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); - if (info->queue == NULL) { - dev_warn(&vcdev->cdev->dev, "no queue\n"); - err = -ENOMEM; - goto out_err; - } - - vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev, - true, info->queue, 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; - } - - /* Register it with the host. */ - if (vcdev->revision == 0) { - info->info_block->l.queue = (__u64)info->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 = (__u64)info->queue; - info->info_block->s.index = i; - info->info_block->s.num = info->num; - info->info_block->s.avail = (__u64)virtqueue_get_avail(vq); - info->info_block->s.used = (__u64)virtqueue_get_used(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) { - if (info->queue) - free_pages_exact(info->queue, size); - kfree(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 = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL); - 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) &info->summary_indicator; - 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: - kfree(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 *names[]) -{ - struct virtio_ccw_device *vcdev = to_vc_device(vdev); - unsigned long *indicatorp = NULL; - int ret, i; - struct ccw1 *ccw; - - ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); - if (!ccw) - return -ENOMEM; - - for (i = 0; i < nvqs; ++i) { - vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i], - 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. */ - indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); - if (!indicatorp) - goto out; - *indicatorp = (unsigned long) &vcdev->indicators; - 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 = 0; - } - if (!vcdev->is_thinint) { - /* Register queue indicators with host. */ - vcdev->indicators = 0; - ccw->cmd_code = CCW_CMD_SET_IND; - ccw->flags = 0; - ccw->count = sizeof(vcdev->indicators); - 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) &vcdev->indicators2; - vcdev->indicators2 = 0; - ccw->cmd_code = CCW_CMD_SET_CONF_IND; - ccw->flags = 0; - ccw->count = sizeof(vcdev->indicators2); - ccw->cda = (__u32)(unsigned long) indicatorp; - ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); - if (ret) - goto out; - - kfree(indicatorp); - kfree(ccw); - return 0; -out: - kfree(indicatorp); - kfree(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 = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); - if (!ccw) - return; - - /* Zero status bits. */ - *vcdev->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); - kfree(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 = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); - if (!ccw) - return 0; - - features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); - 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: - kfree(features); - kfree(ccw); - return rc; -} - -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 = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); - if (!ccw) - return -ENOMEM; - - features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); - if (!features) { - ret = -ENOMEM; - goto out_free; - } - /* Give virtio_ring a chance to accept features. */ - vring_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: - kfree(features); - kfree(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; - - ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); - if (!ccw) - return; - - config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); - 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; - - memcpy(vcdev->config, config_area, sizeof(vcdev->config)); - memcpy(buf, &vcdev->config[offset], len); - -out_free: - kfree(config_area); - kfree(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; - - ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); - if (!ccw) - return; - - config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); - if (!config_area) - goto out_free; - - memcpy(&vcdev->config[offset], buf, len); - /* Write the config area to the host. */ - memcpy(config_area, vcdev->config, sizeof(vcdev->config)); - 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: - kfree(config_area); - kfree(ccw); -} - -static u8 virtio_ccw_get_status(struct virtio_device *vdev) -{ - struct virtio_ccw_device *vcdev = to_vc_device(vdev); - - return *vcdev->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->status; - struct ccw1 *ccw; - int ret; - - ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); - if (!ccw) - return; - - /* Write the status to the host. */ - *vcdev->status = status; - ccw->cmd_code = CCW_CMD_WRITE_STATUS; - ccw->flags = 0; - ccw->count = sizeof(status); - ccw->cda = (__u32)(unsigned long)vcdev->status; - ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); - /* Write failed? We assume status is unchanged. */ - if (ret) - *vcdev->status = old_status; - kfree(ccw); -} - -static 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, -}; - - -/* - * ccw bus driver related functions - */ - -static void virtio_ccw_release_dev(struct device *_d) -{ - struct virtio_device *dev = container_of(_d, struct virtio_device, - dev); - struct virtio_ccw_device *vcdev = to_vc_device(dev); - - kfree(vcdev->status); - kfree(vcdev->config_block); - 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_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; - /* 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; - } - 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_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(&cdev->dev, "Suspicious activity '%08x'\n", - activity); - WARN_ON(1); - break; - } - } - for_each_set_bit(i, &vcdev->indicators, - sizeof(vcdev->indicators) * BITS_PER_BYTE) { - /* The bit clear must happen before the vring kick. */ - clear_bit(i, &vcdev->indicators); - barrier(); - vq = virtio_ccw_vq_by_ind(vcdev, i); - vring_interrupt(0, vq); - } - if (test_bit(0, &vcdev->indicators2)) { - virtio_config_changed(&vcdev->vdev); - clear_bit(0, &vcdev->indicators2); - } -} - -/* - * 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 = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); - if (!ccw) - return -ENOMEM; - rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL); - if (!rev) { - kfree(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); - - kfree(ccw); - kfree(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->config_block = kzalloc(sizeof(*vcdev->config_block), - GFP_DMA | GFP_KERNEL); - if (!vcdev->config_block) { - ret = -ENOMEM; - goto out_free; - } - vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL); - if (!vcdev->status) { - ret = -ENOMEM; - goto out_free; - } - - vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ - - vcdev->vdev.dev.parent = &cdev->dev; - vcdev->vdev.dev.release = virtio_ccw_release_dev; - vcdev->vdev.config = &virtio_ccw_config_ops; - vcdev->cdev = cdev; - init_waitqueue_head(&vcdev->wait_q); - INIT_LIST_HEAD(&vcdev->virtqueues); - spin_lock_init(&vcdev->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) { - kfree(vcdev->status); - kfree(vcdev->config_block); - } - 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; - default: - rc = NOTIFY_DONE; - break; - } - return rc; -} - -static struct ccw_device_id virtio_ids[] = { - { CCW_DEVICE(0x3832, 0) }, - {}, -}; -MODULE_DEVICE_TABLE(ccw, virtio_ids); - -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) -{ - /* parse no_auto string before we do anything further */ - no_auto_parse(); - return ccw_driver_register(&virtio_ccw_driver); -} -module_init(virtio_ccw_init); - -static void __exit virtio_ccw_exit(void) -{ - int i; - - ccw_driver_unregister(&virtio_ccw_driver); - for (i = 0; i < MAX_AIRQ_AREAS; i++) - destroy_airq_info(airq_areas[i]); -} -module_exit(virtio_ccw_exit); |
