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1494 lines
38 KiB
1494 lines
38 KiB
// 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 <[email protected]> |
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*/ |
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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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/* |
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* virtio related functions |
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*/ |
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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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|
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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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|
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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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|
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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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|
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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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|
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/* the highest virtio-ccw revision we support */ |
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#define VIRTIO_CCW_REV_MAX 2 |
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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 DEFINE_MUTEX(airq_areas_lock); |
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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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mutex_lock(&airq_areas_lock); |
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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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mutex_unlock(&airq_areas_lock); |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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; |
|
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); |
|
|
|
/* Release from host. */ |
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if (vcdev->revision == 0) { |
|
info->info_block->l.queue = 0; |
|
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 { |
|
info->info_block->s.desc = 0; |
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info->info_block->s.index = index; |
|
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); |
|
} |
|
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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/* |
|
* -ENODEV isn't considered an error: The device is gone anyway. |
|
* This may happen on device detach. |
|
*/ |
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if (ret && (ret != -ENODEV)) |
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dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", |
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ret, index); |
|
|
|
vring_del_virtqueue(vq); |
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ccw_device_dma_free(vcdev->cdev, info->info_block, |
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sizeof(*info->info_block)); |
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kfree(info); |
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} |
|
|
|
static void virtio_ccw_del_vqs(struct virtio_device *vdev) |
|
{ |
|
struct virtqueue *vq, *n; |
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struct ccw1 *ccw; |
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struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
|
|
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ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
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if (!ccw) |
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return; |
|
|
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virtio_ccw_drop_indicator(vcdev, ccw); |
|
|
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list_for_each_entry_safe(vq, n, &vdev->vqs, list) |
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virtio_ccw_del_vq(vq, ccw); |
|
|
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ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
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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, bool ctx, |
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struct ccw1 *ccw) |
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{ |
|
struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
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int err; |
|
struct virtqueue *vq = NULL; |
|
struct virtio_ccw_vq_info *info; |
|
u64 queue; |
|
unsigned long flags; |
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bool may_reduce; |
|
|
|
/* Allocate queue. */ |
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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 < 2) |
|
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) }, |
|
{}, |
|
}; |
|
|
|
static struct ccw_driver virtio_ccw_driver = { |
|
.driver = { |
|
.owner = THIS_MODULE, |
|
.name = "virtio_ccw", |
|
}, |
|
.ids = virtio_ids, |
|
.probe = virtio_ccw_probe, |
|
.remove = virtio_ccw_remove, |
|
.set_offline = virtio_ccw_offline, |
|
.set_online = virtio_ccw_online, |
|
.notify = virtio_ccw_cio_notify, |
|
.int_class = IRQIO_VIR, |
|
}; |
|
|
|
static int __init pure_hex(char **cp, unsigned int *val, int min_digit, |
|
int max_digit, int max_val) |
|
{ |
|
int diff; |
|
|
|
diff = 0; |
|
*val = 0; |
|
|
|
while (diff <= max_digit) { |
|
int value = hex_to_bin(**cp); |
|
|
|
if (value < 0) |
|
break; |
|
*val = *val * 16 + value; |
|
(*cp)++; |
|
diff++; |
|
} |
|
|
|
if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) |
|
return 1; |
|
|
|
return 0; |
|
} |
|
|
|
static int __init parse_busid(char *str, unsigned int *cssid, |
|
unsigned int *ssid, unsigned int *devno) |
|
{ |
|
char *str_work; |
|
int rc, ret; |
|
|
|
rc = 1; |
|
|
|
if (*str == '\0') |
|
goto out; |
|
|
|
str_work = str; |
|
ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); |
|
if (ret || (str_work[0] != '.')) |
|
goto out; |
|
str_work++; |
|
ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); |
|
if (ret || (str_work[0] != '.')) |
|
goto out; |
|
str_work++; |
|
ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); |
|
if (ret || (str_work[0] != '\0')) |
|
goto out; |
|
|
|
rc = 0; |
|
out: |
|
return rc; |
|
} |
|
|
|
static void __init no_auto_parse(void) |
|
{ |
|
unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; |
|
char *parm, *str; |
|
int rc; |
|
|
|
str = no_auto; |
|
while ((parm = strsep(&str, ","))) { |
|
rc = parse_busid(strsep(&parm, "-"), &from_cssid, |
|
&from_ssid, &from); |
|
if (rc) |
|
continue; |
|
if (parm != NULL) { |
|
rc = parse_busid(parm, &to_cssid, |
|
&to_ssid, &to); |
|
if ((from_ssid > to_ssid) || |
|
((from_ssid == to_ssid) && (from > to))) |
|
rc = -EINVAL; |
|
} else { |
|
to_cssid = from_cssid; |
|
to_ssid = from_ssid; |
|
to = from; |
|
} |
|
if (rc) |
|
continue; |
|
while ((from_ssid < to_ssid) || |
|
((from_ssid == to_ssid) && (from <= to))) { |
|
set_bit(from, devs_no_auto[from_ssid]); |
|
from++; |
|
if (from > __MAX_SUBCHANNEL) { |
|
from_ssid++; |
|
from = 0; |
|
} |
|
} |
|
} |
|
} |
|
|
|
static int __init virtio_ccw_init(void) |
|
{ |
|
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);
|
|
|