1517 lines
38 KiB
C
1517 lines
38 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ccw based virtio transport
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*
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* Copyright IBM Corp. 2012, 2014
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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/memblock.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/moduleparam.h>
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#include <linux/io.h>
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#include <linux/kvm_para.h>
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#include <linux/notifier.h>
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#include <asm/diag.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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#include <asm/virtio-ccw.h>
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#include <asm/isc.h>
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#include <asm/airq.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 vcdev_dma_area {
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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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__u8 status;
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};
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struct virtio_ccw_device {
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struct virtio_device vdev;
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__u8 config[VIRTIO_CCW_CONFIG_SIZE];
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struct ccw_device *cdev;
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__u32 curr_io;
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int err;
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unsigned int revision; /* Transport revision */
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wait_queue_head_t wait_q;
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spinlock_t lock;
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struct mutex io_lock; /* Serializes I/O requests */
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struct list_head virtqueues;
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bool is_thinint;
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bool going_away;
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bool device_lost;
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unsigned int config_ready;
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void *airq_info;
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struct vcdev_dma_area *dma_area;
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};
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static inline unsigned long *indicators(struct virtio_ccw_device *vcdev)
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{
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return &vcdev->dma_area->indicators;
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}
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static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev)
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{
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return &vcdev->dma_area->indicators2;
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}
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struct vq_info_block_legacy {
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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 vq_info_block {
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__u64 desc;
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__u32 res0;
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__u16 index;
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__u16 num;
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__u64 avail;
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__u64 used;
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} __packed;
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struct virtio_feature_desc {
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__le32 features;
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__u8 index;
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} __packed;
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struct virtio_thinint_area {
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unsigned long summary_indicator;
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unsigned long indicator;
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u64 bit_nr;
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u8 isc;
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} __packed;
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struct virtio_rev_info {
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__u16 revision;
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__u16 length;
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__u8 data[];
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};
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/* the highest virtio-ccw revision we support */
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#define VIRTIO_CCW_REV_MAX 1
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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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union {
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struct vq_info_block s;
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struct vq_info_block_legacy l;
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} *info_block;
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int bit_nr;
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struct list_head node;
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long cookie;
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};
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#define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */
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#define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8)
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#define MAX_AIRQ_AREAS 20
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static int virtio_ccw_use_airq = 1;
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struct airq_info {
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rwlock_t lock;
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u8 summary_indicator_idx;
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struct airq_struct airq;
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struct airq_iv *aiv;
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};
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static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
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static u8 *summary_indicators;
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static inline u8 *get_summary_indicator(struct airq_info *info)
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{
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return summary_indicators + info->summary_indicator_idx;
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}
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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 CCW_CMD_READ_STATUS 0x72
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#define CCW_CMD_SET_IND_ADAPTER 0x73
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#define CCW_CMD_SET_VIRTIO_REV 0x83
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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_DOING_SET_IND_ADAPTER 0x08000000
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#define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
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#define VIRTIO_CCW_DOING_READ_STATUS 0x20000000
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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 void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info)
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{
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unsigned long i, flags;
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write_lock_irqsave(&info->lock, flags);
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for (i = 0; i < airq_iv_end(info->aiv); i++) {
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if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) {
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airq_iv_free_bit(info->aiv, i);
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airq_iv_set_ptr(info->aiv, i, 0);
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break;
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}
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}
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write_unlock_irqrestore(&info->lock, flags);
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}
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static void virtio_airq_handler(struct airq_struct *airq, bool floating)
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{
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struct airq_info *info = container_of(airq, struct airq_info, airq);
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unsigned long ai;
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inc_irq_stat(IRQIO_VAI);
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read_lock(&info->lock);
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/* Walk through indicators field, summary indicator active. */
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for (ai = 0;;) {
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ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
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if (ai == -1UL)
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break;
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vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
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}
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*(get_summary_indicator(info)) = 0;
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smp_wmb();
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/* Walk through indicators field, summary indicator not active. */
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for (ai = 0;;) {
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ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
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if (ai == -1UL)
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break;
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vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
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}
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read_unlock(&info->lock);
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}
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static struct airq_info *new_airq_info(int index)
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{
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struct airq_info *info;
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int rc;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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return NULL;
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rwlock_init(&info->lock);
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info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR
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| AIRQ_IV_CACHELINE);
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if (!info->aiv) {
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kfree(info);
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return NULL;
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}
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info->airq.handler = virtio_airq_handler;
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info->summary_indicator_idx = index;
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info->airq.lsi_ptr = get_summary_indicator(info);
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info->airq.lsi_mask = 0xff;
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info->airq.isc = VIRTIO_AIRQ_ISC;
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rc = register_adapter_interrupt(&info->airq);
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if (rc) {
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airq_iv_release(info->aiv);
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kfree(info);
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return NULL;
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}
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return info;
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}
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static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs,
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u64 *first, void **airq_info)
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{
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int i, j;
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struct airq_info *info;
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unsigned long indicator_addr = 0;
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unsigned long bit, flags;
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for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) {
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if (!airq_areas[i])
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airq_areas[i] = new_airq_info(i);
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info = airq_areas[i];
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if (!info)
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return 0;
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write_lock_irqsave(&info->lock, flags);
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bit = airq_iv_alloc(info->aiv, nvqs);
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if (bit == -1UL) {
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/* Not enough vacancies. */
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write_unlock_irqrestore(&info->lock, flags);
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continue;
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}
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*first = bit;
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*airq_info = info;
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indicator_addr = (unsigned long)info->aiv->vector;
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for (j = 0; j < nvqs; j++) {
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airq_iv_set_ptr(info->aiv, bit + j,
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(unsigned long)vqs[j]);
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}
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write_unlock_irqrestore(&info->lock, flags);
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}
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return indicator_addr;
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}
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static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev)
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{
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struct virtio_ccw_vq_info *info;
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if (!vcdev->airq_info)
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return;
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list_for_each_entry(info, &vcdev->virtqueues, node)
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drop_airq_indicator(info->vq, vcdev->airq_info);
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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,
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struct ccw1 *ccw, __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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mutex_lock(&vcdev->io_lock);
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do {
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spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
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ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
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if (!ret) {
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if (!vcdev->curr_io)
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vcdev->err = 0;
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vcdev->curr_io |= flag;
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}
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spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
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cpu_relax();
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} while (ret == -EBUSY);
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wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
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ret = ret ? ret : vcdev->err;
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mutex_unlock(&vcdev->io_lock);
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return ret;
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}
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static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
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struct ccw1 *ccw)
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{
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int ret;
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unsigned long *indicatorp = NULL;
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struct virtio_thinint_area *thinint_area = NULL;
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struct airq_info *airq_info = vcdev->airq_info;
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if (vcdev->is_thinint) {
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thinint_area = ccw_device_dma_zalloc(vcdev->cdev,
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sizeof(*thinint_area));
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if (!thinint_area)
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return;
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thinint_area->summary_indicator =
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(unsigned long) get_summary_indicator(airq_info);
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thinint_area->isc = VIRTIO_AIRQ_ISC;
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ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
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ccw->count = sizeof(*thinint_area);
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ccw->cda = (__u32)(unsigned long) thinint_area;
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} else {
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/* payload is the address of the indicators */
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indicatorp = ccw_device_dma_zalloc(vcdev->cdev,
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sizeof(indicators(vcdev)));
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if (!indicatorp)
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return;
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*indicatorp = 0;
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ccw->cmd_code = CCW_CMD_SET_IND;
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ccw->count = sizeof(indicators(vcdev));
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ccw->cda = (__u32)(unsigned long) indicatorp;
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}
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/* Deregister indicators from host. */
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*indicators(vcdev) = 0;
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ccw->flags = 0;
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ret = ccw_io_helper(vcdev, ccw,
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vcdev->is_thinint ?
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VIRTIO_CCW_DOING_SET_IND_ADAPTER :
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VIRTIO_CCW_DOING_SET_IND);
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if (ret && (ret != -ENODEV))
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dev_info(&vcdev->cdev->dev,
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"Failed to deregister indicators (%d)\n", ret);
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else if (vcdev->is_thinint)
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virtio_ccw_drop_indicators(vcdev);
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ccw_device_dma_free(vcdev->cdev, indicatorp, sizeof(indicators(vcdev)));
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ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area));
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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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long cookie)
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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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register long __cookie asm("4") = cookie;
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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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"d"(__cookie)
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: "memory", "cc");
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return __rc;
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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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long cookie)
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{
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diag_stat_inc(DIAG_STAT_X500);
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return __do_kvm_notify(schid, queue_index, cookie);
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}
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static bool 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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info->cookie = do_kvm_notify(schid, vq->index, info->cookie);
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if (info->cookie < 0)
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return false;
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return true;
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}
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static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
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struct ccw1 *ccw, int index)
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{
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int ret;
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vcdev->dma_area->config_block.index = index;
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ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
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ccw->flags = 0;
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ccw->count = sizeof(struct vq_config_block);
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ccw->cda = (__u32)(unsigned long)(&vcdev->dma_area->config_block);
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ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
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if (ret)
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return ret;
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return vcdev->dma_area->config_block.num ?: -ENOENT;
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}
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static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
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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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int ret;
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unsigned int index = vq->index;
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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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if (vcdev->revision == 0) {
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info->info_block->l.queue = 0;
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info->info_block->l.align = 0;
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info->info_block->l.index = index;
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info->info_block->l.num = 0;
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ccw->count = sizeof(info->info_block->l);
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} else {
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info->info_block->s.desc = 0;
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info->info_block->s.index = index;
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info->info_block->s.num = 0;
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info->info_block->s.avail = 0;
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info->info_block->s.used = 0;
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ccw->count = sizeof(info->info_block->s);
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}
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ccw->cmd_code = CCW_CMD_SET_VQ;
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ccw->flags = 0;
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ccw->cda = (__u32)(unsigned long)(info->info_block);
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ret = ccw_io_helper(vcdev, ccw,
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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))
|
|
dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n",
|
|
ret, index);
|
|
|
|
vring_del_virtqueue(vq);
|
|
ccw_device_dma_free(vcdev->cdev, info->info_block,
|
|
sizeof(*info->info_block));
|
|
kfree(info);
|
|
}
|
|
|
|
static void virtio_ccw_del_vqs(struct virtio_device *vdev)
|
|
{
|
|
struct virtqueue *vq, *n;
|
|
struct ccw1 *ccw;
|
|
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
|
|
|
|
ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
|
|
if (!ccw)
|
|
return;
|
|
|
|
virtio_ccw_drop_indicator(vcdev, ccw);
|
|
|
|
list_for_each_entry_safe(vq, n, &vdev->vqs, list)
|
|
virtio_ccw_del_vq(vq, ccw);
|
|
|
|
ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
|
|
}
|
|
|
|
static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
|
|
int i, vq_callback_t *callback,
|
|
const char *name, bool ctx,
|
|
struct ccw1 *ccw)
|
|
{
|
|
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
|
|
int err;
|
|
struct virtqueue *vq = NULL;
|
|
struct virtio_ccw_vq_info *info;
|
|
u64 queue;
|
|
unsigned long flags;
|
|
bool may_reduce;
|
|
|
|
/* Allocate queue. */
|
|
info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
|
|
if (!info) {
|
|
dev_warn(&vcdev->cdev->dev, "no info\n");
|
|
err = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
info->info_block = ccw_device_dma_zalloc(vcdev->cdev,
|
|
sizeof(*info->info_block));
|
|
if (!info->info_block) {
|
|
dev_warn(&vcdev->cdev->dev, "no info block\n");
|
|
err = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
|
|
if (info->num < 0) {
|
|
err = info->num;
|
|
goto out_err;
|
|
}
|
|
may_reduce = vcdev->revision > 0;
|
|
vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN,
|
|
vdev, true, may_reduce, ctx,
|
|
virtio_ccw_kvm_notify, callback, name);
|
|
|
|
if (!vq) {
|
|
/* For now, we fail if we can't get the requested size. */
|
|
dev_warn(&vcdev->cdev->dev, "no vq\n");
|
|
err = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
/* it may have been reduced */
|
|
info->num = virtqueue_get_vring_size(vq);
|
|
|
|
/* Register it with the host. */
|
|
queue = virtqueue_get_desc_addr(vq);
|
|
if (vcdev->revision == 0) {
|
|
info->info_block->l.queue = queue;
|
|
info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
|
|
info->info_block->l.index = i;
|
|
info->info_block->l.num = info->num;
|
|
ccw->count = sizeof(info->info_block->l);
|
|
} else {
|
|
info->info_block->s.desc = queue;
|
|
info->info_block->s.index = i;
|
|
info->info_block->s.num = info->num;
|
|
info->info_block->s.avail = (__u64)virtqueue_get_avail_addr(vq);
|
|
info->info_block->s.used = (__u64)virtqueue_get_used_addr(vq);
|
|
ccw->count = sizeof(info->info_block->s);
|
|
}
|
|
ccw->cmd_code = CCW_CMD_SET_VQ;
|
|
ccw->flags = 0;
|
|
ccw->cda = (__u32)(unsigned long)(info->info_block);
|
|
err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
|
|
if (err) {
|
|
dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
|
|
goto out_err;
|
|
}
|
|
|
|
info->vq = vq;
|
|
vq->priv = info;
|
|
|
|
/* Save it to our list. */
|
|
spin_lock_irqsave(&vcdev->lock, flags);
|
|
list_add(&info->node, &vcdev->virtqueues);
|
|
spin_unlock_irqrestore(&vcdev->lock, flags);
|
|
|
|
return vq;
|
|
|
|
out_err:
|
|
if (vq)
|
|
vring_del_virtqueue(vq);
|
|
if (info) {
|
|
ccw_device_dma_free(vcdev->cdev, info->info_block,
|
|
sizeof(*info->info_block));
|
|
}
|
|
kfree(info);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
|
|
struct virtqueue *vqs[], int nvqs,
|
|
struct ccw1 *ccw)
|
|
{
|
|
int ret;
|
|
struct virtio_thinint_area *thinint_area = NULL;
|
|
struct airq_info *info;
|
|
|
|
thinint_area = ccw_device_dma_zalloc(vcdev->cdev,
|
|
sizeof(*thinint_area));
|
|
if (!thinint_area) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
/* Try to get an indicator. */
|
|
thinint_area->indicator = get_airq_indicator(vqs, nvqs,
|
|
&thinint_area->bit_nr,
|
|
&vcdev->airq_info);
|
|
if (!thinint_area->indicator) {
|
|
ret = -ENOSPC;
|
|
goto out;
|
|
}
|
|
info = vcdev->airq_info;
|
|
thinint_area->summary_indicator =
|
|
(unsigned long) get_summary_indicator(info);
|
|
thinint_area->isc = VIRTIO_AIRQ_ISC;
|
|
ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
|
|
ccw->flags = CCW_FLAG_SLI;
|
|
ccw->count = sizeof(*thinint_area);
|
|
ccw->cda = (__u32)(unsigned long)thinint_area;
|
|
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
|
|
if (ret) {
|
|
if (ret == -EOPNOTSUPP) {
|
|
/*
|
|
* The host does not support adapter interrupts
|
|
* for virtio-ccw, stop trying.
|
|
*/
|
|
virtio_ccw_use_airq = 0;
|
|
pr_info("Adapter interrupts unsupported on host\n");
|
|
} else
|
|
dev_warn(&vcdev->cdev->dev,
|
|
"enabling adapter interrupts = %d\n", ret);
|
|
virtio_ccw_drop_indicators(vcdev);
|
|
}
|
|
out:
|
|
ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area));
|
|
return ret;
|
|
}
|
|
|
|
static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
|
|
struct virtqueue *vqs[],
|
|
vq_callback_t *callbacks[],
|
|
const char * const names[],
|
|
const bool *ctx,
|
|
struct irq_affinity *desc)
|
|
{
|
|
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
|
|
unsigned long *indicatorp = NULL;
|
|
int ret, i, queue_idx = 0;
|
|
struct ccw1 *ccw;
|
|
|
|
ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
|
|
if (!ccw)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < nvqs; ++i) {
|
|
if (!names[i]) {
|
|
vqs[i] = NULL;
|
|
continue;
|
|
}
|
|
|
|
vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i],
|
|
names[i], ctx ? ctx[i] : false,
|
|
ccw);
|
|
if (IS_ERR(vqs[i])) {
|
|
ret = PTR_ERR(vqs[i]);
|
|
vqs[i] = NULL;
|
|
goto out;
|
|
}
|
|
}
|
|
ret = -ENOMEM;
|
|
/*
|
|
* We need a data area under 2G to communicate. Our payload is
|
|
* the address of the indicators.
|
|
*/
|
|
indicatorp = ccw_device_dma_zalloc(vcdev->cdev,
|
|
sizeof(indicators(vcdev)));
|
|
if (!indicatorp)
|
|
goto out;
|
|
*indicatorp = (unsigned long) indicators(vcdev);
|
|
if (vcdev->is_thinint) {
|
|
ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
|
|
if (ret)
|
|
/* no error, just fall back to legacy interrupts */
|
|
vcdev->is_thinint = false;
|
|
}
|
|
if (!vcdev->is_thinint) {
|
|
/* Register queue indicators with host. */
|
|
*indicators(vcdev) = 0;
|
|
ccw->cmd_code = CCW_CMD_SET_IND;
|
|
ccw->flags = 0;
|
|
ccw->count = sizeof(indicators(vcdev));
|
|
ccw->cda = (__u32)(unsigned long) indicatorp;
|
|
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
/* Register indicators2 with host for config changes */
|
|
*indicatorp = (unsigned long) indicators2(vcdev);
|
|
*indicators2(vcdev) = 0;
|
|
ccw->cmd_code = CCW_CMD_SET_CONF_IND;
|
|
ccw->flags = 0;
|
|
ccw->count = sizeof(indicators2(vcdev));
|
|
ccw->cda = (__u32)(unsigned long) indicatorp;
|
|
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (indicatorp)
|
|
ccw_device_dma_free(vcdev->cdev, indicatorp,
|
|
sizeof(indicators(vcdev)));
|
|
ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
|
|
return 0;
|
|
out:
|
|
if (indicatorp)
|
|
ccw_device_dma_free(vcdev->cdev, indicatorp,
|
|
sizeof(indicators(vcdev)));
|
|
ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
|
|
virtio_ccw_del_vqs(vdev);
|
|
return ret;
|
|
}
|
|
|
|
static void virtio_ccw_reset(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
|
|
struct ccw1 *ccw;
|
|
|
|
ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
|
|
if (!ccw)
|
|
return;
|
|
|
|
/* Zero status bits. */
|
|
vcdev->dma_area->status = 0;
|
|
|
|
/* Send a reset ccw on device. */
|
|
ccw->cmd_code = CCW_CMD_VDEV_RESET;
|
|
ccw->flags = 0;
|
|
ccw->count = 0;
|
|
ccw->cda = 0;
|
|
ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
|
|
ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
|
|
}
|
|
|
|
static u64 virtio_ccw_get_features(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
|
|
struct virtio_feature_desc *features;
|
|
int ret;
|
|
u64 rc;
|
|
struct ccw1 *ccw;
|
|
|
|
ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
|
|
if (!ccw)
|
|
return 0;
|
|
|
|
features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features));
|
|
if (!features) {
|
|
rc = 0;
|
|
goto out_free;
|
|
}
|
|
/* Read the feature bits from the host. */
|
|
features->index = 0;
|
|
ccw->cmd_code = CCW_CMD_READ_FEAT;
|
|
ccw->flags = 0;
|
|
ccw->count = sizeof(*features);
|
|
ccw->cda = (__u32)(unsigned long)features;
|
|
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
|
|
if (ret) {
|
|
rc = 0;
|
|
goto out_free;
|
|
}
|
|
|
|
rc = le32_to_cpu(features->features);
|
|
|
|
if (vcdev->revision == 0)
|
|
goto out_free;
|
|
|
|
/* Read second half of the feature bits from the host. */
|
|
features->index = 1;
|
|
ccw->cmd_code = CCW_CMD_READ_FEAT;
|
|
ccw->flags = 0;
|
|
ccw->count = sizeof(*features);
|
|
ccw->cda = (__u32)(unsigned long)features;
|
|
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
|
|
if (ret == 0)
|
|
rc |= (u64)le32_to_cpu(features->features) << 32;
|
|
|
|
out_free:
|
|
ccw_device_dma_free(vcdev->cdev, features, sizeof(*features));
|
|
ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
|
|
return rc;
|
|
}
|
|
|
|
static void ccw_transport_features(struct virtio_device *vdev)
|
|
{
|
|
/*
|
|
* Currently nothing to do here.
|
|
*/
|
|
}
|
|
|
|
static int virtio_ccw_finalize_features(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
|
|
struct virtio_feature_desc *features;
|
|
struct ccw1 *ccw;
|
|
int ret;
|
|
|
|
if (vcdev->revision >= 1 &&
|
|
!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
|
|
dev_err(&vdev->dev, "virtio: device uses revision 1 "
|
|
"but does not have VIRTIO_F_VERSION_1\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
|
|
if (!ccw)
|
|
return -ENOMEM;
|
|
|
|
features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features));
|
|
if (!features) {
|
|
ret = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
/* Give virtio_ring a chance to accept features. */
|
|
vring_transport_features(vdev);
|
|
|
|
/* Give virtio_ccw a chance to accept features. */
|
|
ccw_transport_features(vdev);
|
|
|
|
features->index = 0;
|
|
features->features = cpu_to_le32((u32)vdev->features);
|
|
/* Write the first half of the feature bits to the host. */
|
|
ccw->cmd_code = CCW_CMD_WRITE_FEAT;
|
|
ccw->flags = 0;
|
|
ccw->count = sizeof(*features);
|
|
ccw->cda = (__u32)(unsigned long)features;
|
|
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
if (vcdev->revision == 0)
|
|
goto out_free;
|
|
|
|
features->index = 1;
|
|
features->features = cpu_to_le32(vdev->features >> 32);
|
|
/* Write the second half of the feature bits to the host. */
|
|
ccw->cmd_code = CCW_CMD_WRITE_FEAT;
|
|
ccw->flags = 0;
|
|
ccw->count = sizeof(*features);
|
|
ccw->cda = (__u32)(unsigned long)features;
|
|
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
|
|
|
|
out_free:
|
|
ccw_device_dma_free(vcdev->cdev, features, sizeof(*features));
|
|
ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void virtio_ccw_get_config(struct virtio_device *vdev,
|
|
unsigned int offset, void *buf, unsigned len)
|
|
{
|
|
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
|
|
int ret;
|
|
struct ccw1 *ccw;
|
|
void *config_area;
|
|
unsigned long flags;
|
|
|
|
ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
|
|
if (!ccw)
|
|
return;
|
|
|
|
config_area = ccw_device_dma_zalloc(vcdev->cdev,
|
|
VIRTIO_CCW_CONFIG_SIZE);
|
|
if (!config_area)
|
|
goto out_free;
|
|
|
|
/* Read the config area from the host. */
|
|
ccw->cmd_code = CCW_CMD_READ_CONF;
|
|
ccw->flags = 0;
|
|
ccw->count = offset + len;
|
|
ccw->cda = (__u32)(unsigned long)config_area;
|
|
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
spin_lock_irqsave(&vcdev->lock, flags);
|
|
memcpy(vcdev->config, config_area, offset + len);
|
|
if (vcdev->config_ready < offset + len)
|
|
vcdev->config_ready = offset + len;
|
|
spin_unlock_irqrestore(&vcdev->lock, flags);
|
|
if (buf)
|
|
memcpy(buf, config_area + offset, len);
|
|
|
|
out_free:
|
|
ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE);
|
|
ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
|
|
}
|
|
|
|
static void virtio_ccw_set_config(struct virtio_device *vdev,
|
|
unsigned int offset, const void *buf,
|
|
unsigned len)
|
|
{
|
|
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
|
|
struct ccw1 *ccw;
|
|
void *config_area;
|
|
unsigned long flags;
|
|
|
|
ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
|
|
if (!ccw)
|
|
return;
|
|
|
|
config_area = ccw_device_dma_zalloc(vcdev->cdev,
|
|
VIRTIO_CCW_CONFIG_SIZE);
|
|
if (!config_area)
|
|
goto out_free;
|
|
|
|
/* Make sure we don't overwrite fields. */
|
|
if (vcdev->config_ready < offset)
|
|
virtio_ccw_get_config(vdev, 0, NULL, offset);
|
|
spin_lock_irqsave(&vcdev->lock, flags);
|
|
memcpy(&vcdev->config[offset], buf, len);
|
|
/* Write the config area to the host. */
|
|
memcpy(config_area, vcdev->config, sizeof(vcdev->config));
|
|
spin_unlock_irqrestore(&vcdev->lock, flags);
|
|
ccw->cmd_code = CCW_CMD_WRITE_CONF;
|
|
ccw->flags = 0;
|
|
ccw->count = offset + len;
|
|
ccw->cda = (__u32)(unsigned long)config_area;
|
|
ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
|
|
|
|
out_free:
|
|
ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE);
|
|
ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
|
|
}
|
|
|
|
static u8 virtio_ccw_get_status(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
|
|
u8 old_status = vcdev->dma_area->status;
|
|
struct ccw1 *ccw;
|
|
|
|
if (vcdev->revision < 1)
|
|
return vcdev->dma_area->status;
|
|
|
|
ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
|
|
if (!ccw)
|
|
return old_status;
|
|
|
|
ccw->cmd_code = CCW_CMD_READ_STATUS;
|
|
ccw->flags = 0;
|
|
ccw->count = sizeof(vcdev->dma_area->status);
|
|
ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status;
|
|
ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS);
|
|
/*
|
|
* If the channel program failed (should only happen if the device
|
|
* was hotunplugged, and then we clean up via the machine check
|
|
* handler anyway), vcdev->dma_area->status was not overwritten and we just
|
|
* return the old status, which is fine.
|
|
*/
|
|
ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
|
|
|
|
return vcdev->dma_area->status;
|
|
}
|
|
|
|
static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
|
|
{
|
|
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
|
|
u8 old_status = vcdev->dma_area->status;
|
|
struct ccw1 *ccw;
|
|
int ret;
|
|
|
|
ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
|
|
if (!ccw)
|
|
return;
|
|
|
|
/* Write the status to the host. */
|
|
vcdev->dma_area->status = status;
|
|
ccw->cmd_code = CCW_CMD_WRITE_STATUS;
|
|
ccw->flags = 0;
|
|
ccw->count = sizeof(status);
|
|
ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status;
|
|
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
|
|
/* Write failed? We assume status is unchanged. */
|
|
if (ret)
|
|
vcdev->dma_area->status = old_status;
|
|
ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
|
|
}
|
|
|
|
static const char *virtio_ccw_bus_name(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
|
|
|
|
return dev_name(&vcdev->cdev->dev);
|
|
}
|
|
|
|
static const struct virtio_config_ops virtio_ccw_config_ops = {
|
|
.get_features = virtio_ccw_get_features,
|
|
.finalize_features = virtio_ccw_finalize_features,
|
|
.get = virtio_ccw_get_config,
|
|
.set = virtio_ccw_set_config,
|
|
.get_status = virtio_ccw_get_status,
|
|
.set_status = virtio_ccw_set_status,
|
|
.reset = virtio_ccw_reset,
|
|
.find_vqs = virtio_ccw_find_vqs,
|
|
.del_vqs = virtio_ccw_del_vqs,
|
|
.bus_name = virtio_ccw_bus_name,
|
|
};
|
|
|
|
|
|
/*
|
|
* ccw bus driver related functions
|
|
*/
|
|
|
|
static void virtio_ccw_release_dev(struct device *_d)
|
|
{
|
|
struct virtio_device *dev = dev_to_virtio(_d);
|
|
struct virtio_ccw_device *vcdev = to_vc_device(dev);
|
|
|
|
ccw_device_dma_free(vcdev->cdev, vcdev->dma_area,
|
|
sizeof(*vcdev->dma_area));
|
|
kfree(vcdev);
|
|
}
|
|
|
|
static int irb_is_error(struct irb *irb)
|
|
{
|
|
if (scsw_cstat(&irb->scsw) != 0)
|
|
return 1;
|
|
if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
|
|
return 1;
|
|
if (scsw_cc(&irb->scsw) != 0)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
|
|
int index)
|
|
{
|
|
struct virtio_ccw_vq_info *info;
|
|
unsigned long flags;
|
|
struct virtqueue *vq;
|
|
|
|
vq = NULL;
|
|
spin_lock_irqsave(&vcdev->lock, flags);
|
|
list_for_each_entry(info, &vcdev->virtqueues, node) {
|
|
if (info->vq->index == index) {
|
|
vq = info->vq;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&vcdev->lock, flags);
|
|
return vq;
|
|
}
|
|
|
|
static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev,
|
|
__u32 activity)
|
|
{
|
|
if (vcdev->curr_io & activity) {
|
|
switch (activity) {
|
|
case VIRTIO_CCW_DOING_READ_FEAT:
|
|
case VIRTIO_CCW_DOING_WRITE_FEAT:
|
|
case VIRTIO_CCW_DOING_READ_CONFIG:
|
|
case VIRTIO_CCW_DOING_WRITE_CONFIG:
|
|
case VIRTIO_CCW_DOING_WRITE_STATUS:
|
|
case VIRTIO_CCW_DOING_READ_STATUS:
|
|
case VIRTIO_CCW_DOING_SET_VQ:
|
|
case VIRTIO_CCW_DOING_SET_IND:
|
|
case VIRTIO_CCW_DOING_SET_CONF_IND:
|
|
case VIRTIO_CCW_DOING_RESET:
|
|
case VIRTIO_CCW_DOING_READ_VQ_CONF:
|
|
case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
|
|
case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
|
|
vcdev->curr_io &= ~activity;
|
|
wake_up(&vcdev->wait_q);
|
|
break;
|
|
default:
|
|
/* don't know what to do... */
|
|
dev_warn(&vcdev->cdev->dev,
|
|
"Suspicious activity '%08x'\n", activity);
|
|
WARN_ON(1);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void virtio_ccw_int_handler(struct ccw_device *cdev,
|
|
unsigned long intparm,
|
|
struct irb *irb)
|
|
{
|
|
__u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
|
|
struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
|
|
int i;
|
|
struct virtqueue *vq;
|
|
|
|
if (!vcdev)
|
|
return;
|
|
if (IS_ERR(irb)) {
|
|
vcdev->err = PTR_ERR(irb);
|
|
virtio_ccw_check_activity(vcdev, activity);
|
|
/* Don't poke around indicators, something's wrong. */
|
|
return;
|
|
}
|
|
/* Check if it's a notification from the host. */
|
|
if ((intparm == 0) &&
|
|
(scsw_stctl(&irb->scsw) ==
|
|
(SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
|
|
/* OK */
|
|
}
|
|
if (irb_is_error(irb)) {
|
|
/* Command reject? */
|
|
if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
|
|
(irb->ecw[0] & SNS0_CMD_REJECT))
|
|
vcdev->err = -EOPNOTSUPP;
|
|
else
|
|
/* Map everything else to -EIO. */
|
|
vcdev->err = -EIO;
|
|
}
|
|
virtio_ccw_check_activity(vcdev, activity);
|
|
for_each_set_bit(i, indicators(vcdev),
|
|
sizeof(*indicators(vcdev)) * BITS_PER_BYTE) {
|
|
/* The bit clear must happen before the vring kick. */
|
|
clear_bit(i, indicators(vcdev));
|
|
barrier();
|
|
vq = virtio_ccw_vq_by_ind(vcdev, i);
|
|
vring_interrupt(0, vq);
|
|
}
|
|
if (test_bit(0, indicators2(vcdev))) {
|
|
virtio_config_changed(&vcdev->vdev);
|
|
clear_bit(0, indicators2(vcdev));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We usually want to autoonline all devices, but give the admin
|
|
* a way to exempt devices from this.
|
|
*/
|
|
#define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
|
|
(8*sizeof(long)))
|
|
static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
|
|
|
|
static char *no_auto = "";
|
|
|
|
module_param(no_auto, charp, 0444);
|
|
MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
|
|
|
|
static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
|
|
{
|
|
struct ccw_dev_id id;
|
|
|
|
ccw_device_get_id(cdev, &id);
|
|
if (test_bit(id.devno, devs_no_auto[id.ssid]))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
|
|
{
|
|
struct ccw_device *cdev = data;
|
|
int ret;
|
|
|
|
ret = ccw_device_set_online(cdev);
|
|
if (ret)
|
|
dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
|
|
}
|
|
|
|
static int virtio_ccw_probe(struct ccw_device *cdev)
|
|
{
|
|
cdev->handler = virtio_ccw_int_handler;
|
|
|
|
if (virtio_ccw_check_autoonline(cdev))
|
|
async_schedule(virtio_ccw_auto_online, cdev);
|
|
return 0;
|
|
}
|
|
|
|
static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
|
|
{
|
|
unsigned long flags;
|
|
struct virtio_ccw_device *vcdev;
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
|
vcdev = dev_get_drvdata(&cdev->dev);
|
|
if (!vcdev || vcdev->going_away) {
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
return NULL;
|
|
}
|
|
vcdev->going_away = true;
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
return vcdev;
|
|
}
|
|
|
|
static void virtio_ccw_remove(struct ccw_device *cdev)
|
|
{
|
|
unsigned long flags;
|
|
struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
|
|
|
|
if (vcdev && cdev->online) {
|
|
if (vcdev->device_lost)
|
|
virtio_break_device(&vcdev->vdev);
|
|
unregister_virtio_device(&vcdev->vdev);
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
|
dev_set_drvdata(&cdev->dev, NULL);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
}
|
|
cdev->handler = NULL;
|
|
}
|
|
|
|
static int virtio_ccw_offline(struct ccw_device *cdev)
|
|
{
|
|
unsigned long flags;
|
|
struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
|
|
|
|
if (!vcdev)
|
|
return 0;
|
|
if (vcdev->device_lost)
|
|
virtio_break_device(&vcdev->vdev);
|
|
unregister_virtio_device(&vcdev->vdev);
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
|
dev_set_drvdata(&cdev->dev, NULL);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
return 0;
|
|
}
|
|
|
|
static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
|
|
{
|
|
struct virtio_rev_info *rev;
|
|
struct ccw1 *ccw;
|
|
int ret;
|
|
|
|
ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
|
|
if (!ccw)
|
|
return -ENOMEM;
|
|
rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev));
|
|
if (!rev) {
|
|
ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Set transport revision */
|
|
ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
|
|
ccw->flags = 0;
|
|
ccw->count = sizeof(*rev);
|
|
ccw->cda = (__u32)(unsigned long)rev;
|
|
|
|
vcdev->revision = VIRTIO_CCW_REV_MAX;
|
|
do {
|
|
rev->revision = vcdev->revision;
|
|
/* none of our supported revisions carry payload */
|
|
rev->length = 0;
|
|
ret = ccw_io_helper(vcdev, ccw,
|
|
VIRTIO_CCW_DOING_SET_VIRTIO_REV);
|
|
if (ret == -EOPNOTSUPP) {
|
|
if (vcdev->revision == 0)
|
|
/*
|
|
* The host device does not support setting
|
|
* the revision: let's operate it in legacy
|
|
* mode.
|
|
*/
|
|
ret = 0;
|
|
else
|
|
vcdev->revision--;
|
|
}
|
|
} while (ret == -EOPNOTSUPP);
|
|
|
|
ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
|
|
ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev));
|
|
return ret;
|
|
}
|
|
|
|
static int virtio_ccw_online(struct ccw_device *cdev)
|
|
{
|
|
int ret;
|
|
struct virtio_ccw_device *vcdev;
|
|
unsigned long flags;
|
|
|
|
vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
|
|
if (!vcdev) {
|
|
dev_warn(&cdev->dev, "Could not get memory for virtio\n");
|
|
ret = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
vcdev->vdev.dev.parent = &cdev->dev;
|
|
vcdev->cdev = cdev;
|
|
vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev,
|
|
sizeof(*vcdev->dma_area));
|
|
if (!vcdev->dma_area) {
|
|
ret = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
|
|
vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
|
|
|
|
vcdev->vdev.dev.release = virtio_ccw_release_dev;
|
|
vcdev->vdev.config = &virtio_ccw_config_ops;
|
|
init_waitqueue_head(&vcdev->wait_q);
|
|
INIT_LIST_HEAD(&vcdev->virtqueues);
|
|
spin_lock_init(&vcdev->lock);
|
|
mutex_init(&vcdev->io_lock);
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
|
dev_set_drvdata(&cdev->dev, vcdev);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
vcdev->vdev.id.vendor = cdev->id.cu_type;
|
|
vcdev->vdev.id.device = cdev->id.cu_model;
|
|
|
|
ret = virtio_ccw_set_transport_rev(vcdev);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
ret = register_virtio_device(&vcdev->vdev);
|
|
if (ret) {
|
|
dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
|
|
ret);
|
|
goto out_put;
|
|
}
|
|
return 0;
|
|
out_put:
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
|
dev_set_drvdata(&cdev->dev, NULL);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
put_device(&vcdev->vdev.dev);
|
|
return ret;
|
|
out_free:
|
|
if (vcdev) {
|
|
ccw_device_dma_free(vcdev->cdev, vcdev->dma_area,
|
|
sizeof(*vcdev->dma_area));
|
|
}
|
|
kfree(vcdev);
|
|
return ret;
|
|
}
|
|
|
|
static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
|
|
{
|
|
int rc;
|
|
struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
|
|
|
|
/*
|
|
* Make sure vcdev is set
|
|
* i.e. set_offline/remove callback not already running
|
|
*/
|
|
if (!vcdev)
|
|
return NOTIFY_DONE;
|
|
|
|
switch (event) {
|
|
case CIO_GONE:
|
|
vcdev->device_lost = true;
|
|
rc = NOTIFY_DONE;
|
|
break;
|
|
case CIO_OPER:
|
|
rc = NOTIFY_OK;
|
|
break;
|
|
default:
|
|
rc = NOTIFY_DONE;
|
|
break;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static struct ccw_device_id virtio_ids[] = {
|
|
{ CCW_DEVICE(0x3832, 0) },
|
|
{},
|
|
};
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int virtio_ccw_freeze(struct ccw_device *cdev)
|
|
{
|
|
struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
|
|
|
|
return virtio_device_freeze(&vcdev->vdev);
|
|
}
|
|
|
|
static int virtio_ccw_restore(struct ccw_device *cdev)
|
|
{
|
|
struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
|
|
int ret;
|
|
|
|
ret = virtio_ccw_set_transport_rev(vcdev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return virtio_device_restore(&vcdev->vdev);
|
|
}
|
|
#endif
|
|
|
|
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,
|
|
#ifdef CONFIG_PM_SLEEP
|
|
.freeze = virtio_ccw_freeze,
|
|
.thaw = virtio_ccw_restore,
|
|
.restore = virtio_ccw_restore,
|
|
#endif
|
|
};
|
|
|
|
static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
|
|
int max_digit, int max_val)
|
|
{
|
|
int diff;
|
|
|
|
diff = 0;
|
|
*val = 0;
|
|
|
|
while (diff <= max_digit) {
|
|
int value = hex_to_bin(**cp);
|
|
|
|
if (value < 0)
|
|
break;
|
|
*val = *val * 16 + value;
|
|
(*cp)++;
|
|
diff++;
|
|
}
|
|
|
|
if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init parse_busid(char *str, unsigned int *cssid,
|
|
unsigned int *ssid, unsigned int *devno)
|
|
{
|
|
char *str_work;
|
|
int rc, ret;
|
|
|
|
rc = 1;
|
|
|
|
if (*str == '\0')
|
|
goto out;
|
|
|
|
str_work = str;
|
|
ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
|
|
if (ret || (str_work[0] != '.'))
|
|
goto out;
|
|
str_work++;
|
|
ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
|
|
if (ret || (str_work[0] != '.'))
|
|
goto out;
|
|
str_work++;
|
|
ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
|
|
if (ret || (str_work[0] != '\0'))
|
|
goto out;
|
|
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static void __init no_auto_parse(void)
|
|
{
|
|
unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
|
|
char *parm, *str;
|
|
int rc;
|
|
|
|
str = no_auto;
|
|
while ((parm = strsep(&str, ","))) {
|
|
rc = parse_busid(strsep(&parm, "-"), &from_cssid,
|
|
&from_ssid, &from);
|
|
if (rc)
|
|
continue;
|
|
if (parm != NULL) {
|
|
rc = parse_busid(parm, &to_cssid,
|
|
&to_ssid, &to);
|
|
if ((from_ssid > to_ssid) ||
|
|
((from_ssid == to_ssid) && (from > to)))
|
|
rc = -EINVAL;
|
|
} else {
|
|
to_cssid = from_cssid;
|
|
to_ssid = from_ssid;
|
|
to = from;
|
|
}
|
|
if (rc)
|
|
continue;
|
|
while ((from_ssid < to_ssid) ||
|
|
((from_ssid == to_ssid) && (from <= to))) {
|
|
set_bit(from, devs_no_auto[from_ssid]);
|
|
from++;
|
|
if (from > __MAX_SUBCHANNEL) {
|
|
from_ssid++;
|
|
from = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int __init virtio_ccw_init(void)
|
|
{
|
|
int rc;
|
|
|
|
/* parse no_auto string before we do anything further */
|
|
no_auto_parse();
|
|
|
|
summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS);
|
|
if (!summary_indicators)
|
|
return -ENOMEM;
|
|
rc = ccw_driver_register(&virtio_ccw_driver);
|
|
if (rc)
|
|
cio_dma_free(summary_indicators, MAX_AIRQ_AREAS);
|
|
return rc;
|
|
}
|
|
device_initcall(virtio_ccw_init);
|