On 12/12/2012 05:36 PM, Cornelia Huck wrote:
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@xxxxxxxxxx>
Signed-off-by: Cornelia Huck<cornelia.huck@xxxxxxxxxx>
---
arch/s390/include/asm/irq.h | 1 +
arch/s390/kernel/irq.c | 1 +
drivers/s390/kvm/Makefile | 2 +-
drivers/s390/kvm/virtio_ccw.c | 854 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 857 insertions(+), 1 deletion(-)
create mode 100644 drivers/s390/kvm/virtio_ccw.c
diff --git a/arch/s390/include/asm/irq.h b/arch/s390/include/asm/irq.h
index 6703dd9..ad2ad6b 100644
--- a/arch/s390/include/asm/irq.h
+++ b/arch/s390/include/asm/irq.h
@@ -33,6 +33,7 @@ enum interruption_class {
IOINT_APB,
IOINT_ADM,
IOINT_CSC,
+ IOINT_VIR,
NMI_NMI,
NR_IRQS,
};
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index 6cdc55b..97c171a 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -58,6 +58,7 @@ static const struct irq_class intrclass_names[] = {
[IOINT_APB] = {.name = "APB", .desc = "[I/O] AP Bus"},
[IOINT_ADM] = {.name = "ADM", .desc = "[I/O] EADM Subchannel"},
[IOINT_CSC] = {.name = "CSC", .desc = "[I/O] CHSC Subchannel"},
+ [IOINT_VIR] = {.name = "VIR", .desc = "[I/O] Virtual I/O Devices"},
[NMI_NMI] = {.name = "NMI", .desc = "[NMI] Machine Check"},
};
diff --git a/drivers/s390/kvm/Makefile b/drivers/s390/kvm/Makefile
index 0815690..241891a 100644
--- a/drivers/s390/kvm/Makefile
+++ b/drivers/s390/kvm/Makefile
@@ -6,4 +6,4 @@
# it under the terms of the GNU General Public License (version 2 only)
# as published by the Free Software Foundation.
-obj-$(CONFIG_S390_GUEST) += kvm_virtio.o
+obj-$(CONFIG_S390_GUEST) += kvm_virtio.o virtio_ccw.o
diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c
new file mode 100644
index 0000000..7f1a0c6
--- /dev/null
+++ b/drivers/s390/kvm/virtio_ccw.c
@@ -0,0 +1,854 @@
+/*
+ * ccw based virtio transport
+ *
+ * Copyright IBM Corp. 2012
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ *
+ * Author(s): Cornelia Huck<cornelia.huck@xxxxxxxxxx>
+ */
+
+#include<linux/kernel_stat.h>
+#include<linux/init.h>
+#include<linux/bootmem.h>
+#include<linux/err.h>
+#include<linux/virtio.h>
+#include<linux/virtio_config.h>
+#include<linux/slab.h>
+#include<linux/interrupt.h>
+#include<linux/virtio_ring.h>
+#include<linux/pfn.h>
+#include<linux/async.h>
+#include<linux/wait.h>
+#include<linux/list.h>
+#include<linux/bitops.h>
+#include<linux/module.h>
+#include<linux/io.h>
+#include<linux/kvm_para.h>
+#include<asm/setup.h>
+#include<asm/irq.h>
+#include<asm/cio.h>
+#include<asm/ccwdev.h>
+#include<asm/schid.h>
+
+/*
+ * virtio related functions
+ */
+
+struct vq_config_block {
+ __u16 index;
+ __u16 num;
+} __packed;
+
+#define VIRTIO_CCW_CONFIG_SIZE 0x100
+/* same as PCI config space size, should be enough for all drivers */
+
+struct virtio_ccw_device {
+ struct virtio_device vdev;
+ __u8 status;
+ __u8 config[VIRTIO_CCW_CONFIG_SIZE];
+ struct ccw_device *cdev;
+ struct ccw1 *ccw;
+ __u32 area;
+ __u32 curr_io;
+ int err;
+ 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;
+};
+
+struct vq_info_block {
+ __u64 queue;
+ __u32 align;
+ __u16 index;
+ __u16 num;
+} __packed;
+
+struct virtio_feature_desc {
+ __u32 features;
+ __u8 index;
+} __packed;
+
+struct virtio_ccw_vq_info {
+ struct virtqueue *vq;
+ int num;
+ void *queue;
+ struct vq_info_block *info_block;
+ struct list_head node;
+};
+
+#define KVM_VIRTIO_CCW_RING_ALIGN 4096
+
+#define KVM_S390_VIRTIO_CCW_NOTIFY 3
+
+#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 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_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 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, __u32 intparm)
+{
+ int ret;
+ unsigned long flags;
+ int flag = intparm& VIRTIO_CCW_INTPARM_MASK;
+
+ spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
+ ret = ccw_device_start(vcdev->cdev, vcdev->ccw, intparm, 0, 0);
+ if (!ret)
+ vcdev->curr_io |= flag;
+ spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
+ wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
+ return ret ? ret : vcdev->err;
+}
+
+static inline long do_kvm_notify(struct subchannel_id schid,
+ unsigned long queue_index)
+{
+ register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
+ register struct subchannel_id __schid asm("2") = schid;
How does the compiler know that the struct fits within a register?
Alex
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