de4e3ae408
Now that we've read all the possible limits that have been defined for a virtio-scsi controller and the disk we're booting from, it's possible that we are STILL going to exceed the limits of the host device. For example, a "-device scsi-generic" device does not support the Block Limits VPD page. So, let's fallback to something that seems to work for most boot configurations if larger values were specified (including if nothing was explicitly specified, and we took default values). Signed-off-by: Eric Farman <farman@linux.vnet.ibm.com> Message-Id: <20170510155359.32727-8-farman@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
75 lines
2 KiB
C
75 lines
2 KiB
C
/*
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* Virtio-SCSI definitions for s390 machine loader for qemu
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*
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* Copyright 2015 IBM Corp.
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* Author: Eugene "jno" Dvurechenski <jno@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#ifndef VIRTIO_SCSI_H
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#define VIRTIO_SCSI_H
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#include "s390-ccw.h"
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#include "virtio.h"
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#include "scsi.h"
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#define VIRTIO_SCSI_CDB_SIZE SCSI_DEFAULT_CDB_SIZE
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#define VIRTIO_SCSI_SENSE_SIZE SCSI_DEFAULT_SENSE_SIZE
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#define VIRTIO_SCSI_MAX_SECTORS 2048
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/* command-specific response values */
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#define VIRTIO_SCSI_S_OK 0x00
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#define VIRTIO_SCSI_S_BAD_TARGET 0x03
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#define QEMU_CDROM_SIGNATURE "QEMU CD-ROM "
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enum virtio_scsi_vq_id {
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VR_CONTROL = 0,
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VR_EVENT = 1,
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VR_REQUEST = 2,
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};
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struct VirtioScsiCmdReq {
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ScsiLun lun;
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uint64_t id;
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uint8_t task_attr; /* = 0 = VIRTIO_SCSI_S_SIMPLE */
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uint8_t prio;
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uint8_t crn; /* = 0 */
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uint8_t cdb[VIRTIO_SCSI_CDB_SIZE];
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} __attribute__((packed));
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typedef struct VirtioScsiCmdReq VirtioScsiCmdReq;
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struct VirtioScsiCmdResp {
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uint32_t sense_len;
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uint32_t residual;
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uint16_t status_qualifier;
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uint8_t status; /* first check for .response */
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uint8_t response; /* then for .status */
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uint8_t sense[VIRTIO_SCSI_SENSE_SIZE];
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} __attribute__((packed));
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typedef struct VirtioScsiCmdResp VirtioScsiCmdResp;
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static inline const char *virtio_scsi_response_msg(const VirtioScsiCmdResp *r)
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{
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static char err_msg[] = "VS RESP=XX";
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uint8_t v = r->response;
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fill_hex_val(err_msg + 8, &v, 1);
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return err_msg;
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}
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static inline bool virtio_scsi_response_ok(const VirtioScsiCmdResp *r)
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{
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return r->response == VIRTIO_SCSI_S_OK && r->status == CDB_STATUS_GOOD;
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}
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void virtio_scsi_setup(VDev *vdev);
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int virtio_scsi_read_many(VDev *vdev,
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ulong sector, void *load_addr, int sec_num);
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#endif /* VIRTIO_SCSI_H */
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