linux-imx

/* sunvdc.c: Sun LDOM Virtual Disk Client.

 *

 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>

 */

​

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/types.h>

#include <linux/blk-mq.h>

#include <linux/hdreg.h>

#include <linux/genhd.h>

#include <linux/cdrom.h>

#include <linux/slab.h>

#include <linux/spinlock.h>

#include <linux/completion.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/list.h>

#include <linux/scatterlist.h>

​

#include <asm/vio.h>

#include <asm/ldc.h>

​

#define DRV_MODULE_NAME     "sunvdc"

#define PFX DRV_MODULE_NAME ": "

#define DRV_MODULE_VERSION  "1.2"

#define DRV_MODULE_RELDATE  "November 24, 2014"

​

static char version[] =

    DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";

MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");

MODULE_DESCRIPTION("Sun LDOM virtual disk client driver");

MODULE_LICENSE("GPL");

MODULE_VERSION(DRV_MODULE_VERSION);

​

#define VDC_TX_RING_SIZE    512

#define VDC_DEFAULT_BLK_SIZE    512

​

#define MAX_XFER_BLKS       (128 * 1024)

#define MAX_XFER_SIZE       (MAX_XFER_BLKS / VDC_DEFAULT_BLK_SIZE)

#define MAX_RING_COOKIES    ((MAX_XFER_BLKS / PAGE_SIZE) + 2)

​

#define WAITING_FOR_LINK_UP 0x01

#define WAITING_FOR_TX_SPACE    0x02

#define WAITING_FOR_GEN_CMD 0x04

#define WAITING_FOR_ANY     -1

​

#define VDC_MAX_RETRIES 10

​

static struct workqueue_struct *sunvdc_wq;

​

struct vdc_req_entry {

    struct request      *req;

};

​

struct vdc_port {

    struct vio_driver_state vio;

​

    struct gendisk      *disk;

​

    struct vdc_completion   *cmp;

​

    u64         req_id;

    u64         seq;

    struct vdc_req_entry    rq_arr[VDC_TX_RING_SIZE];

​

    unsigned long       ring_cookies;

​

    u64         max_xfer_size;

    u32         vdisk_block_size;

    u32         drain;

​

    u64         ldc_timeout;

    struct delayed_work ldc_reset_timer_work;

    struct work_struct  ldc_reset_work;

​

    /* The server fills these in for us in the disk attribute

     * ACK packet.

     */

    u64         operations;

    u32         vdisk_size;

    u8          vdisk_type;

    u8          vdisk_mtype;

    u32         vdisk_phys_blksz;

​

    struct blk_mq_tag_set   tag_set;

​

    char            disk_name[32];

};

​

static void vdc_ldc_reset(struct vdc_port *port);

static void vdc_ldc_reset_work(struct work_struct *work);