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1262 lines
29 KiB
1262 lines
29 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* sunvdc.c: Sun LDOM Virtual Disk Client. |
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* |
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* Copyright (C) 2007, 2008 David S. Miller <[email protected]> |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/blk-mq.h> |
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#include <linux/hdreg.h> |
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#include <linux/genhd.h> |
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#include <linux/cdrom.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/completion.h> |
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#include <linux/delay.h> |
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#include <linux/init.h> |
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#include <linux/list.h> |
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#include <linux/scatterlist.h> |
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|
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#include <asm/vio.h> |
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#include <asm/ldc.h> |
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#define DRV_MODULE_NAME "sunvdc" |
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#define PFX DRV_MODULE_NAME ": " |
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#define DRV_MODULE_VERSION "1.2" |
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#define DRV_MODULE_RELDATE "November 24, 2014" |
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|
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static char version[] = |
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DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; |
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MODULE_AUTHOR("David S. Miller ([email protected])"); |
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MODULE_DESCRIPTION("Sun LDOM virtual disk client driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_VERSION(DRV_MODULE_VERSION); |
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#define VDC_TX_RING_SIZE 512 |
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#define VDC_DEFAULT_BLK_SIZE 512 |
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|
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#define MAX_XFER_BLKS (128 * 1024) |
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#define MAX_XFER_SIZE (MAX_XFER_BLKS / VDC_DEFAULT_BLK_SIZE) |
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#define MAX_RING_COOKIES ((MAX_XFER_BLKS / PAGE_SIZE) + 2) |
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|
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#define WAITING_FOR_LINK_UP 0x01 |
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#define WAITING_FOR_TX_SPACE 0x02 |
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#define WAITING_FOR_GEN_CMD 0x04 |
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#define WAITING_FOR_ANY -1 |
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#define VDC_MAX_RETRIES 10 |
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static struct workqueue_struct *sunvdc_wq; |
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|
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struct vdc_req_entry { |
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struct request *req; |
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}; |
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|
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struct vdc_port { |
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struct vio_driver_state vio; |
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|
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struct gendisk *disk; |
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struct vdc_completion *cmp; |
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u64 req_id; |
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u64 seq; |
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struct vdc_req_entry rq_arr[VDC_TX_RING_SIZE]; |
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|
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unsigned long ring_cookies; |
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u64 max_xfer_size; |
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u32 vdisk_block_size; |
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u32 drain; |
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|
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u64 ldc_timeout; |
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struct delayed_work ldc_reset_timer_work; |
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struct work_struct ldc_reset_work; |
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|
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/* The server fills these in for us in the disk attribute |
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* ACK packet. |
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*/ |
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u64 operations; |
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u32 vdisk_size; |
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u8 vdisk_type; |
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u8 vdisk_mtype; |
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u32 vdisk_phys_blksz; |
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|
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struct blk_mq_tag_set tag_set; |
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|
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char disk_name[32]; |
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}; |
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static void vdc_ldc_reset(struct vdc_port *port); |
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static void vdc_ldc_reset_work(struct work_struct *work); |
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static void vdc_ldc_reset_timer_work(struct work_struct *work); |
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|
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static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio) |
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{ |
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return container_of(vio, struct vdc_port, vio); |
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} |
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|
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/* Ordered from largest major to lowest */ |
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static struct vio_version vdc_versions[] = { |
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{ .major = 1, .minor = 2 }, |
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{ .major = 1, .minor = 1 }, |
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{ .major = 1, .minor = 0 }, |
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}; |
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|
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static inline int vdc_version_supported(struct vdc_port *port, |
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u16 major, u16 minor) |
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{ |
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return port->vio.ver.major == major && port->vio.ver.minor >= minor; |
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} |
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|
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#define VDCBLK_NAME "vdisk" |
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static int vdc_major; |
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#define PARTITION_SHIFT 3 |
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|
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static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr) |
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{ |
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return vio_dring_avail(dr, VDC_TX_RING_SIZE); |
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} |
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|
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static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
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{ |
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struct gendisk *disk = bdev->bd_disk; |
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sector_t nsect = get_capacity(disk); |
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sector_t cylinders = nsect; |
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|
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geo->heads = 0xff; |
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geo->sectors = 0x3f; |
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sector_div(cylinders, geo->heads * geo->sectors); |
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geo->cylinders = cylinders; |
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if ((sector_t)(geo->cylinders + 1) * geo->heads * geo->sectors < nsect) |
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geo->cylinders = 0xffff; |
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return 0; |
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} |
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/* Add ioctl/CDROM_GET_CAPABILITY to support cdrom_id in udev |
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* when vdisk_mtype is VD_MEDIA_TYPE_CD or VD_MEDIA_TYPE_DVD. |
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* Needed to be able to install inside an ldom from an iso image. |
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*/ |
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static int vdc_ioctl(struct block_device *bdev, fmode_t mode, |
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unsigned command, unsigned long argument) |
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{ |
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int i; |
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struct gendisk *disk; |
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|
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switch (command) { |
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case CDROMMULTISESSION: |
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pr_debug(PFX "Multisession CDs not supported\n"); |
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for (i = 0; i < sizeof(struct cdrom_multisession); i++) |
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if (put_user(0, (char __user *)(argument + i))) |
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return -EFAULT; |
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return 0; |
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|
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case CDROM_GET_CAPABILITY: |
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disk = bdev->bd_disk; |
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|
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if (bdev->bd_disk && (disk->flags & GENHD_FL_CD)) |
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return 0; |
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return -EINVAL; |
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default: |
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pr_debug(PFX "ioctl %08x not supported\n", command); |
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return -EINVAL; |
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} |
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} |
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static const struct block_device_operations vdc_fops = { |
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.owner = THIS_MODULE, |
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.getgeo = vdc_getgeo, |
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.ioctl = vdc_ioctl, |
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.compat_ioctl = blkdev_compat_ptr_ioctl, |
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}; |
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static void vdc_blk_queue_start(struct vdc_port *port) |
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{ |
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struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
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|
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/* restart blk queue when ring is half emptied. also called after |
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* handshake completes, so check for initial handshake before we've |
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* allocated a disk. |
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*/ |
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if (port->disk && vdc_tx_dring_avail(dr) * 100 / VDC_TX_RING_SIZE >= 50) |
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blk_mq_start_stopped_hw_queues(port->disk->queue, true); |
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} |
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static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for) |
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{ |
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if (vio->cmp && |
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(waiting_for == -1 || |
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vio->cmp->waiting_for == waiting_for)) { |
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vio->cmp->err = err; |
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complete(&vio->cmp->com); |
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vio->cmp = NULL; |
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} |
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} |
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static void vdc_handshake_complete(struct vio_driver_state *vio) |
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{ |
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struct vdc_port *port = to_vdc_port(vio); |
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cancel_delayed_work(&port->ldc_reset_timer_work); |
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vdc_finish(vio, 0, WAITING_FOR_LINK_UP); |
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vdc_blk_queue_start(port); |
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} |
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static int vdc_handle_unknown(struct vdc_port *port, void *arg) |
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{ |
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struct vio_msg_tag *pkt = arg; |
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|
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printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n", |
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pkt->type, pkt->stype, pkt->stype_env, pkt->sid); |
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printk(KERN_ERR PFX "Resetting connection.\n"); |
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ldc_disconnect(port->vio.lp); |
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return -ECONNRESET; |
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} |
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static int vdc_send_attr(struct vio_driver_state *vio) |
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{ |
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struct vdc_port *port = to_vdc_port(vio); |
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struct vio_disk_attr_info pkt; |
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memset(&pkt, 0, sizeof(pkt)); |
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pkt.tag.type = VIO_TYPE_CTRL; |
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pkt.tag.stype = VIO_SUBTYPE_INFO; |
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pkt.tag.stype_env = VIO_ATTR_INFO; |
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pkt.tag.sid = vio_send_sid(vio); |
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pkt.xfer_mode = VIO_DRING_MODE; |
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pkt.vdisk_block_size = port->vdisk_block_size; |
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pkt.max_xfer_size = port->max_xfer_size; |
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|
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viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n", |
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pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size); |
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|
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return vio_ldc_send(&port->vio, &pkt, sizeof(pkt)); |
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} |
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static int vdc_handle_attr(struct vio_driver_state *vio, void *arg) |
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{ |
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struct vdc_port *port = to_vdc_port(vio); |
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struct vio_disk_attr_info *pkt = arg; |
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|
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viodbg(HS, "GOT ATTR stype[0x%x] ops[%llx] disk_size[%llu] disk_type[%x] " |
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"mtype[0x%x] xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n", |
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pkt->tag.stype, pkt->operations, |
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pkt->vdisk_size, pkt->vdisk_type, pkt->vdisk_mtype, |
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pkt->xfer_mode, pkt->vdisk_block_size, |
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pkt->max_xfer_size); |
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|
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if (pkt->tag.stype == VIO_SUBTYPE_ACK) { |
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switch (pkt->vdisk_type) { |
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case VD_DISK_TYPE_DISK: |
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case VD_DISK_TYPE_SLICE: |
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break; |
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|
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default: |
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printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n", |
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vio->name, pkt->vdisk_type); |
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return -ECONNRESET; |
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} |
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|
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if (pkt->vdisk_block_size > port->vdisk_block_size) { |
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printk(KERN_ERR PFX "%s: BLOCK size increased " |
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"%u --> %u\n", |
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vio->name, |
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port->vdisk_block_size, pkt->vdisk_block_size); |
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return -ECONNRESET; |
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} |
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port->operations = pkt->operations; |
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port->vdisk_type = pkt->vdisk_type; |
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if (vdc_version_supported(port, 1, 1)) { |
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port->vdisk_size = pkt->vdisk_size; |
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port->vdisk_mtype = pkt->vdisk_mtype; |
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} |
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if (pkt->max_xfer_size < port->max_xfer_size) |
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port->max_xfer_size = pkt->max_xfer_size; |
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port->vdisk_block_size = pkt->vdisk_block_size; |
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port->vdisk_phys_blksz = VDC_DEFAULT_BLK_SIZE; |
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if (vdc_version_supported(port, 1, 2)) |
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port->vdisk_phys_blksz = pkt->phys_block_size; |
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return 0; |
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} else { |
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printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name); |
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return -ECONNRESET; |
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} |
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} |
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static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc) |
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{ |
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int err = desc->status; |
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vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD); |
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} |
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static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr, |
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unsigned int index) |
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{ |
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struct vio_disk_desc *desc = vio_dring_entry(dr, index); |
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struct vdc_req_entry *rqe = &port->rq_arr[index]; |
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struct request *req; |
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if (unlikely(desc->hdr.state != VIO_DESC_DONE)) |
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return; |
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ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies); |
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desc->hdr.state = VIO_DESC_FREE; |
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dr->cons = vio_dring_next(dr, index); |
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req = rqe->req; |
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if (req == NULL) { |
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vdc_end_special(port, desc); |
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return; |
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} |
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rqe->req = NULL; |
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blk_mq_end_request(req, desc->status ? BLK_STS_IOERR : 0); |
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vdc_blk_queue_start(port); |
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} |
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static int vdc_ack(struct vdc_port *port, void *msgbuf) |
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{ |
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struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
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struct vio_dring_data *pkt = msgbuf; |
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|
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if (unlikely(pkt->dring_ident != dr->ident || |
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pkt->start_idx != pkt->end_idx || |
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pkt->start_idx >= VDC_TX_RING_SIZE)) |
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return 0; |
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vdc_end_one(port, dr, pkt->start_idx); |
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return 0; |
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} |
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static int vdc_nack(struct vdc_port *port, void *msgbuf) |
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{ |
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/* XXX Implement me XXX */ |
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return 0; |
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} |
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static void vdc_event(void *arg, int event) |
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{ |
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struct vdc_port *port = arg; |
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struct vio_driver_state *vio = &port->vio; |
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unsigned long flags; |
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int err; |
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|
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spin_lock_irqsave(&vio->lock, flags); |
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|
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if (unlikely(event == LDC_EVENT_RESET)) { |
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vio_link_state_change(vio, event); |
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queue_work(sunvdc_wq, &port->ldc_reset_work); |
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goto out; |
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} |
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if (unlikely(event == LDC_EVENT_UP)) { |
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vio_link_state_change(vio, event); |
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goto out; |
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} |
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if (unlikely(event != LDC_EVENT_DATA_READY)) { |
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pr_warn(PFX "Unexpected LDC event %d\n", event); |
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goto out; |
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} |
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err = 0; |
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while (1) { |
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union { |
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struct vio_msg_tag tag; |
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u64 raw[8]; |
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} msgbuf; |
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|
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err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); |
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if (unlikely(err < 0)) { |
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if (err == -ECONNRESET) |
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vio_conn_reset(vio); |
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break; |
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} |
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if (err == 0) |
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break; |
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viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", |
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msgbuf.tag.type, |
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msgbuf.tag.stype, |
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msgbuf.tag.stype_env, |
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msgbuf.tag.sid); |
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err = vio_validate_sid(vio, &msgbuf.tag); |
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if (err < 0) |
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break; |
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|
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if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { |
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if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) |
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err = vdc_ack(port, &msgbuf); |
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else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) |
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err = vdc_nack(port, &msgbuf); |
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else |
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err = vdc_handle_unknown(port, &msgbuf); |
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} else if (msgbuf.tag.type == VIO_TYPE_CTRL) { |
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err = vio_control_pkt_engine(vio, &msgbuf); |
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} else { |
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err = vdc_handle_unknown(port, &msgbuf); |
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} |
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if (err < 0) |
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break; |
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} |
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if (err < 0) |
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vdc_finish(&port->vio, err, WAITING_FOR_ANY); |
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out: |
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spin_unlock_irqrestore(&vio->lock, flags); |
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} |
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|
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static int __vdc_tx_trigger(struct vdc_port *port) |
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{ |
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struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
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struct vio_dring_data hdr = { |
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.tag = { |
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.type = VIO_TYPE_DATA, |
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.stype = VIO_SUBTYPE_INFO, |
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.stype_env = VIO_DRING_DATA, |
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.sid = vio_send_sid(&port->vio), |
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}, |
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.dring_ident = dr->ident, |
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.start_idx = dr->prod, |
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.end_idx = dr->prod, |
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}; |
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int err, delay; |
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int retries = 0; |
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|
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hdr.seq = dr->snd_nxt; |
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delay = 1; |
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do { |
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err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); |
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if (err > 0) { |
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dr->snd_nxt++; |
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break; |
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} |
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udelay(delay); |
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if ((delay <<= 1) > 128) |
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delay = 128; |
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if (retries++ > VDC_MAX_RETRIES) |
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break; |
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} while (err == -EAGAIN); |
|
|
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if (err == -ENOTCONN) |
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vdc_ldc_reset(port); |
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return err; |
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} |
|
|
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static int __send_request(struct request *req) |
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{ |
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struct vdc_port *port = req->rq_disk->private_data; |
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struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
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struct scatterlist sg[MAX_RING_COOKIES]; |
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struct vdc_req_entry *rqe; |
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struct vio_disk_desc *desc; |
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unsigned int map_perm; |
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int nsg, err, i; |
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u64 len; |
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u8 op; |
|
|
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if (WARN_ON(port->ring_cookies > MAX_RING_COOKIES)) |
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return -EINVAL; |
|
|
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map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; |
|
|
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if (rq_data_dir(req) == READ) { |
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map_perm |= LDC_MAP_W; |
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op = VD_OP_BREAD; |
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} else { |
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map_perm |= LDC_MAP_R; |
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op = VD_OP_BWRITE; |
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} |
|
|
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sg_init_table(sg, port->ring_cookies); |
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nsg = blk_rq_map_sg(req->q, req, sg); |
|
|
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len = 0; |
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for (i = 0; i < nsg; i++) |
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len += sg[i].length; |
|
|
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desc = vio_dring_cur(dr); |
|
|
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err = ldc_map_sg(port->vio.lp, sg, nsg, |
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desc->cookies, port->ring_cookies, |
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map_perm); |
|
if (err < 0) { |
|
printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err); |
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return err; |
|
} |
|
|
|
rqe = &port->rq_arr[dr->prod]; |
|
rqe->req = req; |
|
|
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desc->hdr.ack = VIO_ACK_ENABLE; |
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desc->req_id = port->req_id; |
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desc->operation = op; |
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if (port->vdisk_type == VD_DISK_TYPE_DISK) { |
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desc->slice = 0xff; |
|
} else { |
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desc->slice = 0; |
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} |
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desc->status = ~0; |
|
desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size; |
|
desc->size = len; |
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desc->ncookies = err; |
|
|
|
/* This has to be a non-SMP write barrier because we are writing |
|
* to memory which is shared with the peer LDOM. |
|
*/ |
|
wmb(); |
|
desc->hdr.state = VIO_DESC_READY; |
|
|
|
err = __vdc_tx_trigger(port); |
|
if (err < 0) { |
|
printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err); |
|
} else { |
|
port->req_id++; |
|
dr->prod = vio_dring_next(dr, dr->prod); |
|
} |
|
|
|
return err; |
|
} |
|
|
|
static blk_status_t vdc_queue_rq(struct blk_mq_hw_ctx *hctx, |
|
const struct blk_mq_queue_data *bd) |
|
{ |
|
struct vdc_port *port = hctx->queue->queuedata; |
|
struct vio_dring_state *dr; |
|
unsigned long flags; |
|
|
|
dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
|
|
|
blk_mq_start_request(bd->rq); |
|
|
|
spin_lock_irqsave(&port->vio.lock, flags); |
|
|
|
/* |
|
* Doing drain, just end the request in error |
|
*/ |
|
if (unlikely(port->drain)) { |
|
spin_unlock_irqrestore(&port->vio.lock, flags); |
|
return BLK_STS_IOERR; |
|
} |
|
|
|
if (unlikely(vdc_tx_dring_avail(dr) < 1)) { |
|
spin_unlock_irqrestore(&port->vio.lock, flags); |
|
blk_mq_stop_hw_queue(hctx); |
|
return BLK_STS_DEV_RESOURCE; |
|
} |
|
|
|
if (__send_request(bd->rq) < 0) { |
|
spin_unlock_irqrestore(&port->vio.lock, flags); |
|
return BLK_STS_IOERR; |
|
} |
|
|
|
spin_unlock_irqrestore(&port->vio.lock, flags); |
|
return BLK_STS_OK; |
|
} |
|
|
|
static int generic_request(struct vdc_port *port, u8 op, void *buf, int len) |
|
{ |
|
struct vio_dring_state *dr; |
|
struct vio_completion comp; |
|
struct vio_disk_desc *desc; |
|
unsigned int map_perm; |
|
unsigned long flags; |
|
int op_len, err; |
|
void *req_buf; |
|
|
|
if (!(((u64)1 << (u64)op) & port->operations)) |
|
return -EOPNOTSUPP; |
|
|
|
switch (op) { |
|
case VD_OP_BREAD: |
|
case VD_OP_BWRITE: |
|
default: |
|
return -EINVAL; |
|
|
|
case VD_OP_FLUSH: |
|
op_len = 0; |
|
map_perm = 0; |
|
break; |
|
|
|
case VD_OP_GET_WCE: |
|
op_len = sizeof(u32); |
|
map_perm = LDC_MAP_W; |
|
break; |
|
|
|
case VD_OP_SET_WCE: |
|
op_len = sizeof(u32); |
|
map_perm = LDC_MAP_R; |
|
break; |
|
|
|
case VD_OP_GET_VTOC: |
|
op_len = sizeof(struct vio_disk_vtoc); |
|
map_perm = LDC_MAP_W; |
|
break; |
|
|
|
case VD_OP_SET_VTOC: |
|
op_len = sizeof(struct vio_disk_vtoc); |
|
map_perm = LDC_MAP_R; |
|
break; |
|
|
|
case VD_OP_GET_DISKGEOM: |
|
op_len = sizeof(struct vio_disk_geom); |
|
map_perm = LDC_MAP_W; |
|
break; |
|
|
|
case VD_OP_SET_DISKGEOM: |
|
op_len = sizeof(struct vio_disk_geom); |
|
map_perm = LDC_MAP_R; |
|
break; |
|
|
|
case VD_OP_SCSICMD: |
|
op_len = 16; |
|
map_perm = LDC_MAP_RW; |
|
break; |
|
|
|
case VD_OP_GET_DEVID: |
|
op_len = sizeof(struct vio_disk_devid); |
|
map_perm = LDC_MAP_W; |
|
break; |
|
|
|
case VD_OP_GET_EFI: |
|
case VD_OP_SET_EFI: |
|
return -EOPNOTSUPP; |
|
} |
|
|
|
map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; |
|
|
|
op_len = (op_len + 7) & ~7; |
|
req_buf = kzalloc(op_len, GFP_KERNEL); |
|
if (!req_buf) |
|
return -ENOMEM; |
|
|
|
if (len > op_len) |
|
len = op_len; |
|
|
|
if (map_perm & LDC_MAP_R) |
|
memcpy(req_buf, buf, len); |
|
|
|
spin_lock_irqsave(&port->vio.lock, flags); |
|
|
|
dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
|
|
|
/* XXX If we want to use this code generically we have to |
|
* XXX handle TX ring exhaustion etc. |
|
*/ |
|
desc = vio_dring_cur(dr); |
|
|
|
err = ldc_map_single(port->vio.lp, req_buf, op_len, |
|
desc->cookies, port->ring_cookies, |
|
map_perm); |
|
if (err < 0) { |
|
spin_unlock_irqrestore(&port->vio.lock, flags); |
|
kfree(req_buf); |
|
return err; |
|
} |
|
|
|
init_completion(&comp.com); |
|
comp.waiting_for = WAITING_FOR_GEN_CMD; |
|
port->vio.cmp = ∁ |
|
|
|
desc->hdr.ack = VIO_ACK_ENABLE; |
|
desc->req_id = port->req_id; |
|
desc->operation = op; |
|
desc->slice = 0; |
|
desc->status = ~0; |
|
desc->offset = 0; |
|
desc->size = op_len; |
|
desc->ncookies = err; |
|
|
|
/* This has to be a non-SMP write barrier because we are writing |
|
* to memory which is shared with the peer LDOM. |
|
*/ |
|
wmb(); |
|
desc->hdr.state = VIO_DESC_READY; |
|
|
|
err = __vdc_tx_trigger(port); |
|
if (err >= 0) { |
|
port->req_id++; |
|
dr->prod = vio_dring_next(dr, dr->prod); |
|
spin_unlock_irqrestore(&port->vio.lock, flags); |
|
|
|
wait_for_completion(&comp.com); |
|
err = comp.err; |
|
} else { |
|
port->vio.cmp = NULL; |
|
spin_unlock_irqrestore(&port->vio.lock, flags); |
|
} |
|
|
|
if (map_perm & LDC_MAP_W) |
|
memcpy(buf, req_buf, len); |
|
|
|
kfree(req_buf); |
|
|
|
return err; |
|
} |
|
|
|
static int vdc_alloc_tx_ring(struct vdc_port *port) |
|
{ |
|
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
|
unsigned long len, entry_size; |
|
int ncookies; |
|
void *dring; |
|
|
|
entry_size = sizeof(struct vio_disk_desc) + |
|
(sizeof(struct ldc_trans_cookie) * port->ring_cookies); |
|
len = (VDC_TX_RING_SIZE * entry_size); |
|
|
|
ncookies = VIO_MAX_RING_COOKIES; |
|
dring = ldc_alloc_exp_dring(port->vio.lp, len, |
|
dr->cookies, &ncookies, |
|
(LDC_MAP_SHADOW | |
|
LDC_MAP_DIRECT | |
|
LDC_MAP_RW)); |
|
if (IS_ERR(dring)) |
|
return PTR_ERR(dring); |
|
|
|
dr->base = dring; |
|
dr->entry_size = entry_size; |
|
dr->num_entries = VDC_TX_RING_SIZE; |
|
dr->prod = dr->cons = 0; |
|
dr->pending = VDC_TX_RING_SIZE; |
|
dr->ncookies = ncookies; |
|
|
|
return 0; |
|
} |
|
|
|
static void vdc_free_tx_ring(struct vdc_port *port) |
|
{ |
|
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
|
|
|
if (dr->base) { |
|
ldc_free_exp_dring(port->vio.lp, dr->base, |
|
(dr->entry_size * dr->num_entries), |
|
dr->cookies, dr->ncookies); |
|
dr->base = NULL; |
|
dr->entry_size = 0; |
|
dr->num_entries = 0; |
|
dr->pending = 0; |
|
dr->ncookies = 0; |
|
} |
|
} |
|
|
|
static int vdc_port_up(struct vdc_port *port) |
|
{ |
|
struct vio_completion comp; |
|
|
|
init_completion(&comp.com); |
|
comp.err = 0; |
|
comp.waiting_for = WAITING_FOR_LINK_UP; |
|
port->vio.cmp = ∁ |
|
|
|
vio_port_up(&port->vio); |
|
wait_for_completion(&comp.com); |
|
return comp.err; |
|
} |
|
|
|
static void vdc_port_down(struct vdc_port *port) |
|
{ |
|
ldc_disconnect(port->vio.lp); |
|
ldc_unbind(port->vio.lp); |
|
vdc_free_tx_ring(port); |
|
vio_ldc_free(&port->vio); |
|
} |
|
|
|
static const struct blk_mq_ops vdc_mq_ops = { |
|
.queue_rq = vdc_queue_rq, |
|
}; |
|
|
|
static void cleanup_queue(struct request_queue *q) |
|
{ |
|
struct vdc_port *port = q->queuedata; |
|
|
|
blk_cleanup_queue(q); |
|
blk_mq_free_tag_set(&port->tag_set); |
|
} |
|
|
|
static struct request_queue *init_queue(struct vdc_port *port) |
|
{ |
|
struct request_queue *q; |
|
|
|
q = blk_mq_init_sq_queue(&port->tag_set, &vdc_mq_ops, VDC_TX_RING_SIZE, |
|
BLK_MQ_F_SHOULD_MERGE); |
|
if (IS_ERR(q)) |
|
return q; |
|
|
|
q->queuedata = port; |
|
return q; |
|
} |
|
|
|
static int probe_disk(struct vdc_port *port) |
|
{ |
|
struct request_queue *q; |
|
struct gendisk *g; |
|
int err; |
|
|
|
err = vdc_port_up(port); |
|
if (err) |
|
return err; |
|
|
|
/* Using version 1.2 means vdisk_phys_blksz should be set unless the |
|
* disk is reserved by another system. |
|
*/ |
|
if (vdc_version_supported(port, 1, 2) && !port->vdisk_phys_blksz) |
|
return -ENODEV; |
|
|
|
if (vdc_version_supported(port, 1, 1)) { |
|
/* vdisk_size should be set during the handshake, if it wasn't |
|
* then the underlying disk is reserved by another system |
|
*/ |
|
if (port->vdisk_size == -1) |
|
return -ENODEV; |
|
} else { |
|
struct vio_disk_geom geom; |
|
|
|
err = generic_request(port, VD_OP_GET_DISKGEOM, |
|
&geom, sizeof(geom)); |
|
if (err < 0) { |
|
printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns " |
|
"error %d\n", err); |
|
return err; |
|
} |
|
port->vdisk_size = ((u64)geom.num_cyl * |
|
(u64)geom.num_hd * |
|
(u64)geom.num_sec); |
|
} |
|
|
|
q = init_queue(port); |
|
if (IS_ERR(q)) { |
|
printk(KERN_ERR PFX "%s: Could not allocate queue.\n", |
|
port->vio.name); |
|
return PTR_ERR(q); |
|
} |
|
g = alloc_disk(1 << PARTITION_SHIFT); |
|
if (!g) { |
|
printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n", |
|
port->vio.name); |
|
cleanup_queue(q); |
|
return -ENOMEM; |
|
} |
|
|
|
port->disk = g; |
|
|
|
/* Each segment in a request is up to an aligned page in size. */ |
|
blk_queue_segment_boundary(q, PAGE_SIZE - 1); |
|
blk_queue_max_segment_size(q, PAGE_SIZE); |
|
|
|
blk_queue_max_segments(q, port->ring_cookies); |
|
blk_queue_max_hw_sectors(q, port->max_xfer_size); |
|
g->major = vdc_major; |
|
g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT; |
|
strcpy(g->disk_name, port->disk_name); |
|
|
|
g->fops = &vdc_fops; |
|
g->queue = q; |
|
g->private_data = port; |
|
|
|
set_capacity(g, port->vdisk_size); |
|
|
|
if (vdc_version_supported(port, 1, 1)) { |
|
switch (port->vdisk_mtype) { |
|
case VD_MEDIA_TYPE_CD: |
|
pr_info(PFX "Virtual CDROM %s\n", port->disk_name); |
|
g->flags |= GENHD_FL_CD; |
|
g->flags |= GENHD_FL_REMOVABLE; |
|
set_disk_ro(g, 1); |
|
break; |
|
|
|
case VD_MEDIA_TYPE_DVD: |
|
pr_info(PFX "Virtual DVD %s\n", port->disk_name); |
|
g->flags |= GENHD_FL_CD; |
|
g->flags |= GENHD_FL_REMOVABLE; |
|
set_disk_ro(g, 1); |
|
break; |
|
|
|
case VD_MEDIA_TYPE_FIXED: |
|
pr_info(PFX "Virtual Hard disk %s\n", port->disk_name); |
|
break; |
|
} |
|
} |
|
|
|
blk_queue_physical_block_size(q, port->vdisk_phys_blksz); |
|
|
|
pr_info(PFX "%s: %u sectors (%u MB) protocol %d.%d\n", |
|
g->disk_name, |
|
port->vdisk_size, (port->vdisk_size >> (20 - 9)), |
|
port->vio.ver.major, port->vio.ver.minor); |
|
|
|
device_add_disk(&port->vio.vdev->dev, g, NULL); |
|
|
|
return 0; |
|
} |
|
|
|
static struct ldc_channel_config vdc_ldc_cfg = { |
|
.event = vdc_event, |
|
.mtu = 64, |
|
.mode = LDC_MODE_UNRELIABLE, |
|
}; |
|
|
|
static struct vio_driver_ops vdc_vio_ops = { |
|
.send_attr = vdc_send_attr, |
|
.handle_attr = vdc_handle_attr, |
|
.handshake_complete = vdc_handshake_complete, |
|
}; |
|
|
|
static void print_version(void) |
|
{ |
|
static int version_printed; |
|
|
|
if (version_printed++ == 0) |
|
printk(KERN_INFO "%s", version); |
|
} |
|
|
|
struct vdc_check_port_data { |
|
int dev_no; |
|
char *type; |
|
}; |
|
|
|
static int vdc_device_probed(struct device *dev, void *arg) |
|
{ |
|
struct vio_dev *vdev = to_vio_dev(dev); |
|
struct vdc_check_port_data *port_data; |
|
|
|
port_data = (struct vdc_check_port_data *)arg; |
|
|
|
if ((vdev->dev_no == port_data->dev_no) && |
|
(!(strcmp((char *)&vdev->type, port_data->type))) && |
|
dev_get_drvdata(dev)) { |
|
/* This device has already been configured |
|
* by vdc_port_probe() |
|
*/ |
|
return 1; |
|
} else { |
|
return 0; |
|
} |
|
} |
|
|
|
/* Determine whether the VIO device is part of an mpgroup |
|
* by locating all the virtual-device-port nodes associated |
|
* with the parent virtual-device node for the VIO device |
|
* and checking whether any of these nodes are vdc-ports |
|
* which have already been configured. |
|
* |
|
* Returns true if this device is part of an mpgroup and has |
|
* already been probed. |
|
*/ |
|
static bool vdc_port_mpgroup_check(struct vio_dev *vdev) |
|
{ |
|
struct vdc_check_port_data port_data; |
|
struct device *dev; |
|
|
|
port_data.dev_no = vdev->dev_no; |
|
port_data.type = (char *)&vdev->type; |
|
|
|
dev = device_find_child(vdev->dev.parent, &port_data, |
|
vdc_device_probed); |
|
|
|
if (dev) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
|
{ |
|
struct mdesc_handle *hp; |
|
struct vdc_port *port; |
|
int err; |
|
const u64 *ldc_timeout; |
|
|
|
print_version(); |
|
|
|
hp = mdesc_grab(); |
|
|
|
err = -ENODEV; |
|
if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) { |
|
printk(KERN_ERR PFX "Port id [%llu] too large.\n", |
|
vdev->dev_no); |
|
goto err_out_release_mdesc; |
|
} |
|
|
|
/* Check if this device is part of an mpgroup */ |
|
if (vdc_port_mpgroup_check(vdev)) { |
|
printk(KERN_WARNING |
|
"VIO: Ignoring extra vdisk port %s", |
|
dev_name(&vdev->dev)); |
|
goto err_out_release_mdesc; |
|
} |
|
|
|
port = kzalloc(sizeof(*port), GFP_KERNEL); |
|
err = -ENOMEM; |
|
if (!port) { |
|
printk(KERN_ERR PFX "Cannot allocate vdc_port.\n"); |
|
goto err_out_release_mdesc; |
|
} |
|
|
|
if (vdev->dev_no >= 26) |
|
snprintf(port->disk_name, sizeof(port->disk_name), |
|
VDCBLK_NAME "%c%c", |
|
'a' + ((int)vdev->dev_no / 26) - 1, |
|
'a' + ((int)vdev->dev_no % 26)); |
|
else |
|
snprintf(port->disk_name, sizeof(port->disk_name), |
|
VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26)); |
|
port->vdisk_size = -1; |
|
|
|
/* Actual wall time may be double due to do_generic_file_read() doing |
|
* a readahead I/O first, and once that fails it will try to read a |
|
* single page. |
|
*/ |
|
ldc_timeout = mdesc_get_property(hp, vdev->mp, "vdc-timeout", NULL); |
|
port->ldc_timeout = ldc_timeout ? *ldc_timeout : 0; |
|
INIT_DELAYED_WORK(&port->ldc_reset_timer_work, vdc_ldc_reset_timer_work); |
|
INIT_WORK(&port->ldc_reset_work, vdc_ldc_reset_work); |
|
|
|
err = vio_driver_init(&port->vio, vdev, VDEV_DISK, |
|
vdc_versions, ARRAY_SIZE(vdc_versions), |
|
&vdc_vio_ops, port->disk_name); |
|
if (err) |
|
goto err_out_free_port; |
|
|
|
port->vdisk_block_size = VDC_DEFAULT_BLK_SIZE; |
|
port->max_xfer_size = MAX_XFER_SIZE; |
|
port->ring_cookies = MAX_RING_COOKIES; |
|
|
|
err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port); |
|
if (err) |
|
goto err_out_free_port; |
|
|
|
err = vdc_alloc_tx_ring(port); |
|
if (err) |
|
goto err_out_free_ldc; |
|
|
|
err = probe_disk(port); |
|
if (err) |
|
goto err_out_free_tx_ring; |
|
|
|
/* Note that the device driver_data is used to determine |
|
* whether the port has been probed. |
|
*/ |
|
dev_set_drvdata(&vdev->dev, port); |
|
|
|
mdesc_release(hp); |
|
|
|
return 0; |
|
|
|
err_out_free_tx_ring: |
|
vdc_free_tx_ring(port); |
|
|
|
err_out_free_ldc: |
|
vio_ldc_free(&port->vio); |
|
|
|
err_out_free_port: |
|
kfree(port); |
|
|
|
err_out_release_mdesc: |
|
mdesc_release(hp); |
|
return err; |
|
} |
|
|
|
static int vdc_port_remove(struct vio_dev *vdev) |
|
{ |
|
struct vdc_port *port = dev_get_drvdata(&vdev->dev); |
|
|
|
if (port) { |
|
blk_mq_stop_hw_queues(port->disk->queue); |
|
|
|
flush_work(&port->ldc_reset_work); |
|
cancel_delayed_work_sync(&port->ldc_reset_timer_work); |
|
del_timer_sync(&port->vio.timer); |
|
|
|
del_gendisk(port->disk); |
|
cleanup_queue(port->disk->queue); |
|
put_disk(port->disk); |
|
port->disk = NULL; |
|
|
|
vdc_free_tx_ring(port); |
|
vio_ldc_free(&port->vio); |
|
|
|
dev_set_drvdata(&vdev->dev, NULL); |
|
|
|
kfree(port); |
|
} |
|
return 0; |
|
} |
|
|
|
static void vdc_requeue_inflight(struct vdc_port *port) |
|
{ |
|
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
|
u32 idx; |
|
|
|
for (idx = dr->cons; idx != dr->prod; idx = vio_dring_next(dr, idx)) { |
|
struct vio_disk_desc *desc = vio_dring_entry(dr, idx); |
|
struct vdc_req_entry *rqe = &port->rq_arr[idx]; |
|
struct request *req; |
|
|
|
ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies); |
|
desc->hdr.state = VIO_DESC_FREE; |
|
dr->cons = vio_dring_next(dr, idx); |
|
|
|
req = rqe->req; |
|
if (req == NULL) { |
|
vdc_end_special(port, desc); |
|
continue; |
|
} |
|
|
|
rqe->req = NULL; |
|
blk_mq_requeue_request(req, false); |
|
} |
|
} |
|
|
|
static void vdc_queue_drain(struct vdc_port *port) |
|
{ |
|
struct request_queue *q = port->disk->queue; |
|
|
|
/* |
|
* Mark the queue as draining, then freeze/quiesce to ensure |
|
* that all existing requests are seen in ->queue_rq() and killed |
|
*/ |
|
port->drain = 1; |
|
spin_unlock_irq(&port->vio.lock); |
|
|
|
blk_mq_freeze_queue(q); |
|
blk_mq_quiesce_queue(q); |
|
|
|
spin_lock_irq(&port->vio.lock); |
|
port->drain = 0; |
|
blk_mq_unquiesce_queue(q); |
|
blk_mq_unfreeze_queue(q); |
|
} |
|
|
|
static void vdc_ldc_reset_timer_work(struct work_struct *work) |
|
{ |
|
struct vdc_port *port; |
|
struct vio_driver_state *vio; |
|
|
|
port = container_of(work, struct vdc_port, ldc_reset_timer_work.work); |
|
vio = &port->vio; |
|
|
|
spin_lock_irq(&vio->lock); |
|
if (!(port->vio.hs_state & VIO_HS_COMPLETE)) { |
|
pr_warn(PFX "%s ldc down %llu seconds, draining queue\n", |
|
port->disk_name, port->ldc_timeout); |
|
vdc_queue_drain(port); |
|
vdc_blk_queue_start(port); |
|
} |
|
spin_unlock_irq(&vio->lock); |
|
} |
|
|
|
static void vdc_ldc_reset_work(struct work_struct *work) |
|
{ |
|
struct vdc_port *port; |
|
struct vio_driver_state *vio; |
|
unsigned long flags; |
|
|
|
port = container_of(work, struct vdc_port, ldc_reset_work); |
|
vio = &port->vio; |
|
|
|
spin_lock_irqsave(&vio->lock, flags); |
|
vdc_ldc_reset(port); |
|
spin_unlock_irqrestore(&vio->lock, flags); |
|
} |
|
|
|
static void vdc_ldc_reset(struct vdc_port *port) |
|
{ |
|
int err; |
|
|
|
assert_spin_locked(&port->vio.lock); |
|
|
|
pr_warn(PFX "%s ldc link reset\n", port->disk_name); |
|
blk_mq_stop_hw_queues(port->disk->queue); |
|
vdc_requeue_inflight(port); |
|
vdc_port_down(port); |
|
|
|
err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port); |
|
if (err) { |
|
pr_err(PFX "%s vio_ldc_alloc:%d\n", port->disk_name, err); |
|
return; |
|
} |
|
|
|
err = vdc_alloc_tx_ring(port); |
|
if (err) { |
|
pr_err(PFX "%s vio_alloc_tx_ring:%d\n", port->disk_name, err); |
|
goto err_free_ldc; |
|
} |
|
|
|
if (port->ldc_timeout) |
|
mod_delayed_work(system_wq, &port->ldc_reset_timer_work, |
|
round_jiffies(jiffies + HZ * port->ldc_timeout)); |
|
mod_timer(&port->vio.timer, round_jiffies(jiffies + HZ)); |
|
return; |
|
|
|
err_free_ldc: |
|
vio_ldc_free(&port->vio); |
|
} |
|
|
|
static const struct vio_device_id vdc_port_match[] = { |
|
{ |
|
.type = "vdc-port", |
|
}, |
|
{}, |
|
}; |
|
MODULE_DEVICE_TABLE(vio, vdc_port_match); |
|
|
|
static struct vio_driver vdc_port_driver = { |
|
.id_table = vdc_port_match, |
|
.probe = vdc_port_probe, |
|
.remove = vdc_port_remove, |
|
.name = "vdc_port", |
|
}; |
|
|
|
static int __init vdc_init(void) |
|
{ |
|
int err; |
|
|
|
sunvdc_wq = alloc_workqueue("sunvdc", 0, 0); |
|
if (!sunvdc_wq) |
|
return -ENOMEM; |
|
|
|
err = register_blkdev(0, VDCBLK_NAME); |
|
if (err < 0) |
|
goto out_free_wq; |
|
|
|
vdc_major = err; |
|
|
|
err = vio_register_driver(&vdc_port_driver); |
|
if (err) |
|
goto out_unregister_blkdev; |
|
|
|
return 0; |
|
|
|
out_unregister_blkdev: |
|
unregister_blkdev(vdc_major, VDCBLK_NAME); |
|
vdc_major = 0; |
|
|
|
out_free_wq: |
|
destroy_workqueue(sunvdc_wq); |
|
return err; |
|
} |
|
|
|
static void __exit vdc_exit(void) |
|
{ |
|
vio_unregister_driver(&vdc_port_driver); |
|
unregister_blkdev(vdc_major, VDCBLK_NAME); |
|
destroy_workqueue(sunvdc_wq); |
|
} |
|
|
|
module_init(vdc_init); |
|
module_exit(vdc_exit);
|
|
|