KVM: s390: Add a channel I/O based virtio transport driver.
Add a driver for kvm guests that matches virtual ccw devices provided by the host as virtio bridge devices. These virtio-ccw devices use a special set of channel commands in order to perform virtio functions. Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Reviewed-by: Alexander Graf <agraf@suse.de> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Cornelia Huck
Gleb Natapov
parent
0abbe448ed
commit
7e64e0597f
@ -35,6 +35,7 @@ enum interruption_class {
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IOINT_CSC,
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IOINT_PCI,
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IOINT_MSI,
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IOINT_VIR,
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NMI_NMI,
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NR_IRQS,
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};
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@ -60,6 +60,7 @@ static const struct irq_class intrclass_names[] = {
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[IOINT_CSC] = {.name = "CSC", .desc = "[I/O] CHSC Subchannel"},
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[IOINT_PCI] = {.name = "PCI", .desc = "[I/O] PCI Interrupt" },
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[IOINT_MSI] = {.name = "MSI", .desc = "[I/O] MSI Interrupt" },
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[IOINT_VIR] = {.name = "VIR", .desc = "[I/O] Virtual I/O Devices"},
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[NMI_NMI] = {.name = "NMI", .desc = "[NMI] Machine Check"},
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};
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@ -6,4 +6,4 @@
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# it under the terms of the GNU General Public License (version 2 only)
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# as published by the Free Software Foundation.
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obj-$(CONFIG_S390_GUEST) += kvm_virtio.o
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obj-$(CONFIG_S390_GUEST) += kvm_virtio.o virtio_ccw.o
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853
drivers/s390/kvm/virtio_ccw.c
Normal file
853
drivers/s390/kvm/virtio_ccw.c
Normal file
@ -0,0 +1,853 @@
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/*
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* ccw based virtio transport
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*
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* Copyright IBM Corp. 2012
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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* as published by the Free Software Foundation.
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*
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* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
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*/
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#include <linux/kernel_stat.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/err.h>
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#include <linux/virtio.h>
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#include <linux/virtio_config.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/virtio_ring.h>
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#include <linux/pfn.h>
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#include <linux/async.h>
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#include <linux/wait.h>
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#include <linux/list.h>
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#include <linux/bitops.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/kvm_para.h>
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#include <asm/setup.h>
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#include <asm/irq.h>
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#include <asm/cio.h>
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#include <asm/ccwdev.h>
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/*
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* virtio related functions
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*/
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struct vq_config_block {
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__u16 index;
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__u16 num;
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} __packed;
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#define VIRTIO_CCW_CONFIG_SIZE 0x100
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/* same as PCI config space size, should be enough for all drivers */
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struct virtio_ccw_device {
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struct virtio_device vdev;
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__u8 status;
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__u8 config[VIRTIO_CCW_CONFIG_SIZE];
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struct ccw_device *cdev;
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struct ccw1 *ccw;
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__u32 area;
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__u32 curr_io;
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int err;
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wait_queue_head_t wait_q;
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spinlock_t lock;
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struct list_head virtqueues;
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unsigned long indicators;
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unsigned long indicators2;
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struct vq_config_block *config_block;
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};
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struct vq_info_block {
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__u64 queue;
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__u32 align;
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__u16 index;
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__u16 num;
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} __packed;
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struct virtio_feature_desc {
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__u32 features;
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__u8 index;
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} __packed;
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struct virtio_ccw_vq_info {
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struct virtqueue *vq;
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int num;
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void *queue;
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struct vq_info_block *info_block;
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struct list_head node;
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};
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#define KVM_VIRTIO_CCW_RING_ALIGN 4096
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#define KVM_S390_VIRTIO_CCW_NOTIFY 3
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#define CCW_CMD_SET_VQ 0x13
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#define CCW_CMD_VDEV_RESET 0x33
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#define CCW_CMD_SET_IND 0x43
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#define CCW_CMD_SET_CONF_IND 0x53
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#define CCW_CMD_READ_FEAT 0x12
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#define CCW_CMD_WRITE_FEAT 0x11
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#define CCW_CMD_READ_CONF 0x22
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#define CCW_CMD_WRITE_CONF 0x21
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#define CCW_CMD_WRITE_STATUS 0x31
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#define CCW_CMD_READ_VQ_CONF 0x32
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#define VIRTIO_CCW_DOING_SET_VQ 0x00010000
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#define VIRTIO_CCW_DOING_RESET 0x00040000
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#define VIRTIO_CCW_DOING_READ_FEAT 0x00080000
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#define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000
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#define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000
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#define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000
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#define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000
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#define VIRTIO_CCW_DOING_SET_IND 0x01000000
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#define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
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#define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
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#define VIRTIO_CCW_INTPARM_MASK 0xffff0000
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static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
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{
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return container_of(vdev, struct virtio_ccw_device, vdev);
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}
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static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag)
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{
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unsigned long flags;
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__u32 ret;
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spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
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if (vcdev->err)
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ret = 0;
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else
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ret = vcdev->curr_io & flag;
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spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
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return ret;
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}
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static int ccw_io_helper(struct virtio_ccw_device *vcdev, __u32 intparm)
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{
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int ret;
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unsigned long flags;
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int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
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spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
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ret = ccw_device_start(vcdev->cdev, vcdev->ccw, intparm, 0, 0);
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if (!ret)
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vcdev->curr_io |= flag;
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spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
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wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
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return ret ? ret : vcdev->err;
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}
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static inline long do_kvm_notify(struct subchannel_id schid,
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unsigned long queue_index)
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{
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register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
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register struct subchannel_id __schid asm("2") = schid;
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register unsigned long __index asm("3") = queue_index;
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register long __rc asm("2");
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asm volatile ("diag 2,4,0x500\n"
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: "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index)
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: "memory", "cc");
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return __rc;
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}
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static void virtio_ccw_kvm_notify(struct virtqueue *vq)
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{
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struct virtio_ccw_vq_info *info = vq->priv;
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struct virtio_ccw_device *vcdev;
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struct subchannel_id schid;
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vcdev = to_vc_device(info->vq->vdev);
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ccw_device_get_schid(vcdev->cdev, &schid);
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do_kvm_notify(schid, virtqueue_get_queue_index(vq));
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}
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static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, int index)
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{
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vcdev->config_block->index = index;
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vcdev->ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
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vcdev->ccw->flags = 0;
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vcdev->ccw->count = sizeof(struct vq_config_block);
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vcdev->ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
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ccw_io_helper(vcdev, VIRTIO_CCW_DOING_READ_VQ_CONF);
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return vcdev->config_block->num;
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}
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static void virtio_ccw_del_vq(struct virtqueue *vq)
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{
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struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
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struct virtio_ccw_vq_info *info = vq->priv;
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unsigned long flags;
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unsigned long size;
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int ret;
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unsigned int index = virtqueue_get_queue_index(vq);
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/* Remove from our list. */
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spin_lock_irqsave(&vcdev->lock, flags);
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list_del(&info->node);
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spin_unlock_irqrestore(&vcdev->lock, flags);
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/* Release from host. */
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info->info_block->queue = 0;
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info->info_block->align = 0;
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info->info_block->index = index;
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info->info_block->num = 0;
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vcdev->ccw->cmd_code = CCW_CMD_SET_VQ;
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vcdev->ccw->flags = 0;
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vcdev->ccw->count = sizeof(*info->info_block);
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vcdev->ccw->cda = (__u32)(unsigned long)(info->info_block);
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ret = ccw_io_helper(vcdev, VIRTIO_CCW_DOING_SET_VQ | index);
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/*
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* -ENODEV isn't considered an error: The device is gone anyway.
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* This may happen on device detach.
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*/
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if (ret && (ret != -ENODEV))
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dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d",
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ret, index);
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vring_del_virtqueue(vq);
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size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
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free_pages_exact(info->queue, size);
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kfree(info->info_block);
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kfree(info);
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}
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static void virtio_ccw_del_vqs(struct virtio_device *vdev)
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{
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struct virtqueue *vq, *n;
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list_for_each_entry_safe(vq, n, &vdev->vqs, list)
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virtio_ccw_del_vq(vq);
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}
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static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
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int i, vq_callback_t *callback,
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const char *name)
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{
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struct virtio_ccw_device *vcdev = to_vc_device(vdev);
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int err;
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struct virtqueue *vq;
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struct virtio_ccw_vq_info *info;
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unsigned long size;
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unsigned long flags;
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/* Allocate queue. */
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info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
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if (!info) {
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dev_warn(&vcdev->cdev->dev, "no info\n");
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err = -ENOMEM;
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goto out_err;
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}
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info->info_block = kzalloc(sizeof(*info->info_block),
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GFP_DMA | GFP_KERNEL);
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if (!info->info_block) {
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dev_warn(&vcdev->cdev->dev, "no info block\n");
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err = -ENOMEM;
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goto out_err;
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}
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info->num = virtio_ccw_read_vq_conf(vcdev, i);
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size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
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info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
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if (info->queue == NULL) {
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dev_warn(&vcdev->cdev->dev, "no queue\n");
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err = -ENOMEM;
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goto out_err;
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}
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vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
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true, info->queue, virtio_ccw_kvm_notify,
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callback, name);
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if (!vq) {
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/* For now, we fail if we can't get the requested size. */
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dev_warn(&vcdev->cdev->dev, "no vq\n");
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err = -ENOMEM;
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free_pages_exact(info->queue, size);
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goto out_err;
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}
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info->vq = vq;
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vq->priv = info;
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/* Register it with the host. */
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info->info_block->queue = (__u64)info->queue;
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info->info_block->align = KVM_VIRTIO_CCW_RING_ALIGN;
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info->info_block->index = i;
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info->info_block->num = info->num;
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vcdev->ccw->cmd_code = CCW_CMD_SET_VQ;
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vcdev->ccw->flags = 0;
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vcdev->ccw->count = sizeof(*info->info_block);
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vcdev->ccw->cda = (__u32)(unsigned long)(info->info_block);
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err = ccw_io_helper(vcdev, VIRTIO_CCW_DOING_SET_VQ | i);
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if (err) {
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dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
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free_pages_exact(info->queue, size);
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info->vq = NULL;
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vq->priv = NULL;
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goto out_err;
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}
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/* Save it to our list. */
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spin_lock_irqsave(&vcdev->lock, flags);
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list_add(&info->node, &vcdev->virtqueues);
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spin_unlock_irqrestore(&vcdev->lock, flags);
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return vq;
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out_err:
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if (info)
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kfree(info->info_block);
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kfree(info);
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return ERR_PTR(err);
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}
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static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
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struct virtqueue *vqs[],
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vq_callback_t *callbacks[],
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const char *names[])
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{
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struct virtio_ccw_device *vcdev = to_vc_device(vdev);
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unsigned long *indicatorp = NULL;
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int ret, i;
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for (i = 0; i < nvqs; ++i) {
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vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i]);
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if (IS_ERR(vqs[i])) {
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ret = PTR_ERR(vqs[i]);
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vqs[i] = NULL;
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goto out;
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}
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}
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ret = -ENOMEM;
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/* We need a data area under 2G to communicate. */
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indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
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if (!indicatorp)
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goto out;
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*indicatorp = (unsigned long) &vcdev->indicators;
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/* Register queue indicators with host. */
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vcdev->indicators = 0;
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vcdev->ccw->cmd_code = CCW_CMD_SET_IND;
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vcdev->ccw->flags = 0;
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vcdev->ccw->count = sizeof(vcdev->indicators);
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vcdev->ccw->cda = (__u32)(unsigned long) indicatorp;
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ret = ccw_io_helper(vcdev, VIRTIO_CCW_DOING_SET_IND);
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if (ret)
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goto out;
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/* Register indicators2 with host for config changes */
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*indicatorp = (unsigned long) &vcdev->indicators2;
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vcdev->indicators2 = 0;
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vcdev->ccw->cmd_code = CCW_CMD_SET_CONF_IND;
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vcdev->ccw->flags = 0;
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vcdev->ccw->count = sizeof(vcdev->indicators2);
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vcdev->ccw->cda = (__u32)(unsigned long) indicatorp;
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ret = ccw_io_helper(vcdev, VIRTIO_CCW_DOING_SET_CONF_IND);
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if (ret)
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goto out;
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kfree(indicatorp);
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return 0;
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out:
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kfree(indicatorp);
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virtio_ccw_del_vqs(vdev);
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return ret;
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}
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static void virtio_ccw_reset(struct virtio_device *vdev)
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{
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struct virtio_ccw_device *vcdev = to_vc_device(vdev);
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/* Zero status bits. */
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vcdev->status = 0;
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/* Send a reset ccw on device. */
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vcdev->ccw->cmd_code = CCW_CMD_VDEV_RESET;
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vcdev->ccw->flags = 0;
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vcdev->ccw->count = 0;
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vcdev->ccw->cda = 0;
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ccw_io_helper(vcdev, VIRTIO_CCW_DOING_RESET);
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}
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static u32 virtio_ccw_get_features(struct virtio_device *vdev)
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{
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struct virtio_ccw_device *vcdev = to_vc_device(vdev);
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struct virtio_feature_desc features;
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int ret;
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/* Read the feature bits from the host. */
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/* TODO: Features > 32 bits */
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features.index = 0;
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vcdev->ccw->cmd_code = CCW_CMD_READ_FEAT;
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vcdev->ccw->flags = 0;
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vcdev->ccw->count = sizeof(features);
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vcdev->ccw->cda = vcdev->area;
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ret = ccw_io_helper(vcdev, VIRTIO_CCW_DOING_READ_FEAT);
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if (ret)
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return 0;
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memcpy(&features, (void *)(unsigned long)vcdev->area,
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sizeof(features));
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return le32_to_cpu(features.features);
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}
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static void virtio_ccw_finalize_features(struct virtio_device *vdev)
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{
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struct virtio_ccw_device *vcdev = to_vc_device(vdev);
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struct virtio_feature_desc features;
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int i;
|
||||
|
||||
/* Give virtio_ring a chance to accept features. */
|
||||
vring_transport_features(vdev);
|
||||
|
||||
for (i = 0; i < sizeof(*vdev->features) / sizeof(features.features);
|
||||
i++) {
|
||||
int highbits = i % 2 ? 32 : 0;
|
||||
features.index = i;
|
||||
features.features = cpu_to_le32(vdev->features[i / 2]
|
||||
>> highbits);
|
||||
memcpy((void *)(unsigned long)vcdev->area, &features,
|
||||
sizeof(features));
|
||||
/* Write the feature bits to the host. */
|
||||
vcdev->ccw->cmd_code = CCW_CMD_WRITE_FEAT;
|
||||
vcdev->ccw->flags = 0;
|
||||
vcdev->ccw->count = sizeof(features);
|
||||
vcdev->ccw->cda = vcdev->area;
|
||||
ccw_io_helper(vcdev, VIRTIO_CCW_DOING_WRITE_FEAT);
|
||||
}
|
||||
}
|
||||
|
||||
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;
|
||||
|
||||
/* Read the config area from the host. */
|
||||
vcdev->ccw->cmd_code = CCW_CMD_READ_CONF;
|
||||
vcdev->ccw->flags = 0;
|
||||
vcdev->ccw->count = offset + len;
|
||||
vcdev->ccw->cda = vcdev->area;
|
||||
ret = ccw_io_helper(vcdev, VIRTIO_CCW_DOING_READ_CONFIG);
|
||||
if (ret)
|
||||
return;
|
||||
|
||||
memcpy(vcdev->config, (void *)(unsigned long)vcdev->area,
|
||||
sizeof(vcdev->config));
|
||||
memcpy(buf, &vcdev->config[offset], len);
|
||||
}
|
||||
|
||||
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);
|
||||
|
||||
memcpy(&vcdev->config[offset], buf, len);
|
||||
/* Write the config area to the host. */
|
||||
memcpy((void *)(unsigned long)vcdev->area, vcdev->config,
|
||||
sizeof(vcdev->config));
|
||||
vcdev->ccw->cmd_code = CCW_CMD_WRITE_CONF;
|
||||
vcdev->ccw->flags = 0;
|
||||
vcdev->ccw->count = offset + len;
|
||||
vcdev->ccw->cda = vcdev->area;
|
||||
ccw_io_helper(vcdev, VIRTIO_CCW_DOING_WRITE_CONFIG);
|
||||
}
|
||||
|
||||
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);
|
||||
|
||||
/* Write the status to the host. */
|
||||
vcdev->status = status;
|
||||
memcpy((void *)(unsigned long)vcdev->area, &status, sizeof(status));
|
||||
vcdev->ccw->cmd_code = CCW_CMD_WRITE_STATUS;
|
||||
vcdev->ccw->flags = 0;
|
||||
vcdev->ccw->count = sizeof(status);
|
||||
vcdev->ccw->cda = vcdev->area;
|
||||
ccw_io_helper(vcdev, VIRTIO_CCW_DOING_WRITE_STATUS);
|
||||
}
|
||||
|
||||
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((void *)(unsigned long)vcdev->area);
|
||||
kfree(vcdev->config_block);
|
||||
kfree(vcdev->ccw);
|
||||
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 (virtqueue_get_queue_index(info->vq) == 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;
|
||||
struct virtio_driver *drv;
|
||||
|
||||
/* 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))
|
||||
vcdev->err = -EIO; /* XXX - use real error */
|
||||
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:
|
||||
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)) {
|
||||
drv = container_of(vcdev->vdev.dev.driver,
|
||||
struct virtio_driver, driver);
|
||||
|
||||
if (drv && drv->config_changed)
|
||||
drv->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 void virtio_ccw_remove(struct ccw_device *cdev)
|
||||
{
|
||||
struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
|
||||
|
||||
if (cdev->online) {
|
||||
unregister_virtio_device(&vcdev->vdev);
|
||||
dev_set_drvdata(&cdev->dev, NULL);
|
||||
}
|
||||
cdev->handler = NULL;
|
||||
}
|
||||
|
||||
static int virtio_ccw_offline(struct ccw_device *cdev)
|
||||
{
|
||||
struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
|
||||
|
||||
unregister_virtio_device(&vcdev->vdev);
|
||||
dev_set_drvdata(&cdev->dev, NULL);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/* Area needs to be big enough to fit status, features or configuration. */
|
||||
#define VIRTIO_AREA_SIZE VIRTIO_CCW_CONFIG_SIZE /* biggest possible use */
|
||||
|
||||
static int virtio_ccw_online(struct ccw_device *cdev)
|
||||
{
|
||||
int ret;
|
||||
struct virtio_ccw_device *vcdev;
|
||||
|
||||
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->area = (__u32)(unsigned long)kzalloc(VIRTIO_AREA_SIZE,
|
||||
GFP_DMA | GFP_KERNEL);
|
||||
if (!vcdev->area) {
|
||||
dev_warn(&cdev->dev, "Cound 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->ccw = kzalloc(sizeof(*vcdev->ccw), GFP_DMA | GFP_KERNEL);
|
||||
if (!vcdev->ccw) {
|
||||
ret = -ENOMEM;
|
||||
goto out_free;
|
||||
}
|
||||
|
||||
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);
|
||||
|
||||
dev_set_drvdata(&cdev->dev, vcdev);
|
||||
vcdev->vdev.id.vendor = cdev->id.cu_type;
|
||||
vcdev->vdev.id.device = cdev->id.cu_model;
|
||||
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:
|
||||
dev_set_drvdata(&cdev->dev, NULL);
|
||||
put_device(&vcdev->vdev.dev);
|
||||
return ret;
|
||||
out_free:
|
||||
if (vcdev) {
|
||||
kfree((void *)(unsigned long)vcdev->area);
|
||||
kfree(vcdev->config_block);
|
||||
kfree(vcdev->ccw);
|
||||
}
|
||||
kfree(vcdev);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
|
||||
{
|
||||
/* TODO: Check whether we need special handling here. */
|
||||
return 0;
|
||||
}
|
||||
|
||||
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 = IOINT_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)
|
||||
{
|
||||
ccw_driver_unregister(&virtio_ccw_driver);
|
||||
}
|
||||
module_exit(virtio_ccw_exit);
|
||||
Loading…
Reference in New Issue
Block a user