Commit 3c2f7c12 authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Kevin Wolf
Browse files

scsi-disk: report media changed via GET EVENT STATUS NOTIFICATION 



This adds support for media change notification via the GET EVENT STATUS
NOTIFICATION command, used by Linux versions 2.6.38 and newer.

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent ceb792ef

hw/scsi-disk.c

+53 −4
Original line number Diff line number Diff line
@@ -72,6 +72,7 @@ struct SCSIDiskState 
    uint32_t removable;

    uint64_t max_lba;

    bool media_changed;

    bool media_event;

    QEMUBH *bh;

    char *version;

    char *serial;
@@ -687,12 +688,59 @@ fail: 
    return -1;

}



static int scsi_get_event_status_notification(SCSIDiskState *s,

                                              SCSIDiskReq *r, uint8_t *outbuf)

static int scsi_event_status_media(SCSIDiskState *s, uint8_t *outbuf)

{

    scsi_check_condition(r, SENSE_CODE(INVALID_OPCODE));

    uint8_t event_code, media_status;



    media_status = 0;

    if (s->tray_open) {

        media_status = MS_TRAY_OPEN;

    } else if (bdrv_is_inserted(s->bs)) {

        media_status = MS_MEDIA_PRESENT;

    }



    /* Event notification descriptor */

    event_code = MEC_NO_CHANGE;

    if (media_status != MS_TRAY_OPEN && s->media_event) {

        event_code = MEC_NEW_MEDIA;

        s->media_event = false;

    }



    outbuf[0] = event_code;

    outbuf[1] = media_status;



    /* These fields are reserved, just clear them. */

    outbuf[2] = 0;

    outbuf[3] = 0;

    return 4;

}



static int scsi_get_event_status_notification(SCSIDiskState *s, SCSIDiskReq *r,

                                              uint8_t *outbuf)

{

    int size;

    uint8_t *buf = r->req.cmd.buf;

    uint8_t notification_class_request = buf[4];

    if (s->qdev.type != TYPE_ROM) {

        return -1;

    }

    if ((buf[1] & 1) == 0) {

        /* asynchronous */

        return -1;

    }



    size = 4;

    outbuf[0] = outbuf[1] = 0;

    outbuf[3] = 1 << GESN_MEDIA; /* supported events */

    if (notification_class_request & (1 << GESN_MEDIA)) {

        outbuf[2] = GESN_MEDIA;

        size += scsi_event_status_media(s, &outbuf[size]);

    } else {

        outbuf[2] = 0x80;

    }

    stw_be_p(outbuf, size - 4);

    return size;

}



static int scsi_get_configuration(SCSIDiskState *s, uint8_t *outbuf)

{
@@ -1442,6 +1490,7 @@ static void scsi_cd_change_media_cb(void *opaque, bool load) 
    s->media_changed = load;

    s->tray_open = !load;

    s->qdev.unit_attention = SENSE_CODE(UNIT_ATTENTION_NO_MEDIUM);

    s->media_event = true;

}



static bool scsi_cd_is_tray_open(void *opaque)