From 1b568d934eec1c5c99565c41f6c8ca66e9743e96 Mon Sep 17 00:00:00 2001 From: Cornelia Huck Date: Tue, 7 Jul 2015 11:41:01 +0200 Subject: virtio/s390: rename drivers/s390/kvm -> drivers/s390/virtio This more accurately reflects what these drivers actually do. Suggested-by: Paolo Bonzini Acked-by: Christian Borntraeger Signed-off-by: Cornelia Huck Signed-off-by: Michael S. Tsirkin --- MAINTAINERS | 2 +- drivers/s390/Makefile | 2 +- drivers/s390/kvm/Makefile | 9 - drivers/s390/kvm/kvm_virtio.c | 510 -------------- drivers/s390/kvm/virtio_ccw.c | 1380 -------------------------------------- drivers/s390/virtio/Makefile | 9 + drivers/s390/virtio/kvm_virtio.c | 510 ++++++++++++++ drivers/s390/virtio/virtio_ccw.c | 1380 ++++++++++++++++++++++++++++++++++++++ 8 files changed, 1901 insertions(+), 1901 deletions(-) delete mode 100644 drivers/s390/kvm/Makefile delete mode 100644 drivers/s390/kvm/kvm_virtio.c delete mode 100644 drivers/s390/kvm/virtio_ccw.c create mode 100644 drivers/s390/virtio/Makefile create mode 100644 drivers/s390/virtio/kvm_virtio.c create mode 100644 drivers/s390/virtio/virtio_ccw.c diff --git a/MAINTAINERS b/MAINTAINERS index 280a5681d5b2..fbef7d0a4dd5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -10577,7 +10577,7 @@ L: linux-s390@vger.kernel.org L: virtualization@lists.linux-foundation.org L: kvm@vger.kernel.org S: Supported -F: drivers/s390/kvm/ +F: drivers/s390/virtio/ VIRTIO HOST (VHOST) M: "Michael S. Tsirkin" diff --git a/drivers/s390/Makefile b/drivers/s390/Makefile index 95bccfd3f169..e5225ad9c5b1 100644 --- a/drivers/s390/Makefile +++ b/drivers/s390/Makefile @@ -2,7 +2,7 @@ # Makefile for the S/390 specific device drivers # -obj-y += cio/ block/ char/ crypto/ net/ scsi/ kvm/ +obj-y += cio/ block/ char/ crypto/ net/ scsi/ virtio/ drivers-y += drivers/s390/built-in.o diff --git a/drivers/s390/kvm/Makefile b/drivers/s390/kvm/Makefile deleted file mode 100644 index 241891a57caf..000000000000 --- 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 dd65c8b4c7fe..000000000000 --- 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 - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#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 6f1fa1773e76..000000000000 --- 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 - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -/* - * 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); diff --git a/drivers/s390/virtio/Makefile b/drivers/s390/virtio/Makefile new file mode 100644 index 000000000000..241891a57caf --- /dev/null +++ b/drivers/s390/virtio/Makefile @@ -0,0 +1,9 @@ +# 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/virtio/kvm_virtio.c b/drivers/s390/virtio/kvm_virtio.c new file mode 100644 index 000000000000..dd65c8b4c7fe --- /dev/null +++ b/drivers/s390/virtio/kvm_virtio.c @@ -0,0 +1,510 @@ +/* + * 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 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c new file mode 100644 index 000000000000..6f1fa1773e76 --- /dev/null +++ b/drivers/s390/virtio/virtio_ccw.c @@ -0,0 +1,1380 @@ +/* + * 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 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * 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); -- cgit v1.2.3-59-g8ed1b