Several important steps during device scan depend on SCSI type of the device. For example, max_transfer property is only determined and assigned if the device has the type of TYPE_DISK. Host-managed ZBC disks retain most of the properties of regular SCSI drives, but they have their own SCSI device type, 0x14. This prevents the proper assignment of max_transfer property for HM-zoned devices in scsi-generic driver leading to I/O errors if the maximum i/o size calculated at the guest exceeds the host value. To fix this, define TYPE_ZBC to have the standard value from SCSI ZBC standard spec. Several scan steps that were previously done only for TYPE_DISK devices, are now performed for the SCSI devices having TYPE_ZBC too. Reported-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com> Message-Id: <20200811225122.17342-3-dmitry.fomichev@wdc.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
792 lines
22 KiB
C
792 lines
22 KiB
C
/*
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* Generic SCSI Device support
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*
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* Copyright (c) 2007 Bull S.A.S.
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* Based on code by Paul Brook
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* Based on code by Fabrice Bellard
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*
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* Written by Laurent Vivier <Laurent.Vivier@bull.net>
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*
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* This code is licensed under the LGPL.
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*
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/ctype.h"
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#include "qemu/error-report.h"
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#include "qemu/module.h"
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#include "hw/scsi/scsi.h"
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#include "migration/qemu-file-types.h"
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#include "hw/qdev-properties.h"
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#include "hw/scsi/emulation.h"
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#include "sysemu/block-backend.h"
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#include "trace.h"
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#ifdef __linux__
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#include <scsi/sg.h>
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#include "scsi/constants.h"
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#ifndef MAX_UINT
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#define MAX_UINT ((unsigned int)-1)
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#endif
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typedef struct SCSIGenericReq {
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SCSIRequest req;
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uint8_t *buf;
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int buflen;
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int len;
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sg_io_hdr_t io_header;
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} SCSIGenericReq;
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static void scsi_generic_save_request(QEMUFile *f, SCSIRequest *req)
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{
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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qemu_put_sbe32s(f, &r->buflen);
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if (r->buflen && r->req.cmd.mode == SCSI_XFER_TO_DEV) {
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assert(!r->req.sg);
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qemu_put_buffer(f, r->buf, r->req.cmd.xfer);
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}
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}
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static void scsi_generic_load_request(QEMUFile *f, SCSIRequest *req)
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{
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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qemu_get_sbe32s(f, &r->buflen);
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if (r->buflen && r->req.cmd.mode == SCSI_XFER_TO_DEV) {
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assert(!r->req.sg);
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qemu_get_buffer(f, r->buf, r->req.cmd.xfer);
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}
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}
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static void scsi_free_request(SCSIRequest *req)
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{
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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g_free(r->buf);
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}
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/* Helper function for command completion. */
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static void scsi_command_complete_noio(SCSIGenericReq *r, int ret)
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{
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int status;
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SCSISense sense;
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assert(r->req.aiocb == NULL);
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if (r->req.io_canceled) {
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scsi_req_cancel_complete(&r->req);
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goto done;
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}
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status = sg_io_sense_from_errno(-ret, &r->io_header, &sense);
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if (status == CHECK_CONDITION) {
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if (r->io_header.driver_status & SG_ERR_DRIVER_SENSE) {
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r->req.sense_len = r->io_header.sb_len_wr;
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} else {
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scsi_req_build_sense(&r->req, sense);
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}
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}
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trace_scsi_generic_command_complete_noio(r, r->req.tag, status);
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scsi_req_complete(&r->req, status);
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done:
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scsi_req_unref(&r->req);
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}
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static void scsi_command_complete(void *opaque, int ret)
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{
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SCSIGenericReq *r = (SCSIGenericReq *)opaque;
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SCSIDevice *s = r->req.dev;
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assert(r->req.aiocb != NULL);
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r->req.aiocb = NULL;
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aio_context_acquire(blk_get_aio_context(s->conf.blk));
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scsi_command_complete_noio(r, ret);
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aio_context_release(blk_get_aio_context(s->conf.blk));
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}
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static int execute_command(BlockBackend *blk,
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SCSIGenericReq *r, int direction,
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BlockCompletionFunc *complete)
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{
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r->io_header.interface_id = 'S';
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r->io_header.dxfer_direction = direction;
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r->io_header.dxferp = r->buf;
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r->io_header.dxfer_len = r->buflen;
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r->io_header.cmdp = r->req.cmd.buf;
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r->io_header.cmd_len = r->req.cmd.len;
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r->io_header.mx_sb_len = sizeof(r->req.sense);
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r->io_header.sbp = r->req.sense;
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r->io_header.timeout = MAX_UINT;
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r->io_header.usr_ptr = r;
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r->io_header.flags |= SG_FLAG_DIRECT_IO;
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r->req.aiocb = blk_aio_ioctl(blk, SG_IO, &r->io_header, complete, r);
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if (r->req.aiocb == NULL) {
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return -EIO;
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}
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return 0;
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}
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static void scsi_handle_inquiry_reply(SCSIGenericReq *r, SCSIDevice *s)
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{
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uint8_t page, page_idx;
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/*
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* EVPD set to zero returns the standard INQUIRY data.
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*
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* Check if scsi_version is unset (-1) to avoid re-defining it
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* each time an INQUIRY with standard data is received.
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* scsi_version is initialized with -1 in scsi_generic_reset
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* and scsi_disk_reset, making sure that we'll set the
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* scsi_version after a reset. If the version field of the
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* INQUIRY response somehow changes after a guest reboot,
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* we'll be able to keep track of it.
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*
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* On SCSI-2 and older, first 3 bits of byte 2 is the
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* ANSI-approved version, while on later versions the
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* whole byte 2 contains the version. Check if we're dealing
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* with a newer version and, in that case, assign the
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* whole byte.
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*/
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if (s->scsi_version == -1 && !(r->req.cmd.buf[1] & 0x01)) {
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s->scsi_version = r->buf[2] & 0x07;
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if (s->scsi_version > 2) {
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s->scsi_version = r->buf[2];
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}
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}
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if ((s->type == TYPE_DISK || s->type == TYPE_ZBC) &&
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(r->req.cmd.buf[1] & 0x01)) {
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page = r->req.cmd.buf[2];
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if (page == 0xb0) {
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uint32_t max_transfer =
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blk_get_max_transfer(s->conf.blk) / s->blocksize;
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assert(max_transfer);
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stl_be_p(&r->buf[8], max_transfer);
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/* Also take care of the opt xfer len. */
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stl_be_p(&r->buf[12],
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MIN_NON_ZERO(max_transfer, ldl_be_p(&r->buf[12])));
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} else if (s->needs_vpd_bl_emulation && page == 0x00 && r->buflen >= 4) {
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/*
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* Now we're capable of supplying the VPD Block Limits
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* response if the hardware can't. Add it in the INQUIRY
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* Supported VPD pages response in case we are using the
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* emulation for this device.
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*
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* This way, the guest kernel will be aware of the support
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* and will use it to proper setup the SCSI device.
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*
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* VPD page numbers must be sorted, so insert 0xb0 at the
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* right place with an in-place insert. When the while loop
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* begins the device response is at r[0] to r[page_idx - 1].
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*/
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page_idx = lduw_be_p(r->buf + 2) + 4;
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page_idx = MIN(page_idx, r->buflen);
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while (page_idx > 4 && r->buf[page_idx - 1] >= 0xb0) {
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if (page_idx < r->buflen) {
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r->buf[page_idx] = r->buf[page_idx - 1];
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}
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page_idx--;
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}
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if (page_idx < r->buflen) {
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r->buf[page_idx] = 0xb0;
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}
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stw_be_p(r->buf + 2, lduw_be_p(r->buf + 2) + 1);
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}
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}
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}
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static int scsi_generic_emulate_block_limits(SCSIGenericReq *r, SCSIDevice *s)
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{
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int len;
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uint8_t buf[64];
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SCSIBlockLimits bl = {
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.max_io_sectors = blk_get_max_transfer(s->conf.blk) / s->blocksize
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};
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memset(r->buf, 0, r->buflen);
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stb_p(buf, s->type);
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stb_p(buf + 1, 0xb0);
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len = scsi_emulate_block_limits(buf + 4, &bl);
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assert(len <= sizeof(buf) - 4);
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stw_be_p(buf + 2, len);
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memcpy(r->buf, buf, MIN(r->buflen, len + 4));
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r->io_header.sb_len_wr = 0;
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/*
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* We have valid contents in the reply buffer but the
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* io_header can report a sense error coming from
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* the hardware in scsi_command_complete_noio. Clean
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* up the io_header to avoid reporting it.
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*/
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r->io_header.driver_status = 0;
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r->io_header.status = 0;
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return r->buflen;
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}
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static void scsi_read_complete(void * opaque, int ret)
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{
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SCSIGenericReq *r = (SCSIGenericReq *)opaque;
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SCSIDevice *s = r->req.dev;
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int len;
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assert(r->req.aiocb != NULL);
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r->req.aiocb = NULL;
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aio_context_acquire(blk_get_aio_context(s->conf.blk));
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if (ret || r->req.io_canceled) {
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scsi_command_complete_noio(r, ret);
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goto done;
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}
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len = r->io_header.dxfer_len - r->io_header.resid;
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trace_scsi_generic_read_complete(r->req.tag, len);
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r->len = -1;
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if (r->io_header.driver_status & SG_ERR_DRIVER_SENSE) {
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SCSISense sense =
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scsi_parse_sense_buf(r->req.sense, r->io_header.sb_len_wr);
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/*
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* Check if this is a VPD Block Limits request that
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* resulted in sense error but would need emulation.
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* In this case, emulate a valid VPD response.
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*/
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if (sense.key == ILLEGAL_REQUEST &&
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s->needs_vpd_bl_emulation &&
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r->req.cmd.buf[0] == INQUIRY &&
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(r->req.cmd.buf[1] & 0x01) &&
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r->req.cmd.buf[2] == 0xb0) {
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len = scsi_generic_emulate_block_limits(r, s);
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/*
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* It's okay to jup to req_complete: no need to
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* let scsi_handle_inquiry_reply handle an
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* INQUIRY VPD BL request we created manually.
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*/
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}
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if (sense.key) {
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goto req_complete;
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}
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}
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if (len == 0) {
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scsi_command_complete_noio(r, 0);
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goto done;
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}
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/* Snoop READ CAPACITY output to set the blocksize. */
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if (r->req.cmd.buf[0] == READ_CAPACITY_10 &&
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(ldl_be_p(&r->buf[0]) != 0xffffffffU || s->max_lba == 0)) {
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s->blocksize = ldl_be_p(&r->buf[4]);
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s->max_lba = ldl_be_p(&r->buf[0]) & 0xffffffffULL;
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} else if (r->req.cmd.buf[0] == SERVICE_ACTION_IN_16 &&
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(r->req.cmd.buf[1] & 31) == SAI_READ_CAPACITY_16) {
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s->blocksize = ldl_be_p(&r->buf[8]);
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s->max_lba = ldq_be_p(&r->buf[0]);
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}
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blk_set_guest_block_size(s->conf.blk, s->blocksize);
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/*
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* Patch MODE SENSE device specific parameters if the BDS is opened
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* readonly.
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*/
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if ((s->type == TYPE_DISK || s->type == TYPE_TAPE || s->type == TYPE_ZBC) &&
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blk_is_read_only(s->conf.blk) &&
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(r->req.cmd.buf[0] == MODE_SENSE ||
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r->req.cmd.buf[0] == MODE_SENSE_10) &&
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(r->req.cmd.buf[1] & 0x8) == 0) {
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if (r->req.cmd.buf[0] == MODE_SENSE) {
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r->buf[2] |= 0x80;
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} else {
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r->buf[3] |= 0x80;
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}
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}
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if (r->req.cmd.buf[0] == INQUIRY) {
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scsi_handle_inquiry_reply(r, s);
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}
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req_complete:
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scsi_req_data(&r->req, len);
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scsi_req_unref(&r->req);
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done:
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aio_context_release(blk_get_aio_context(s->conf.blk));
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}
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/* Read more data from scsi device into buffer. */
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static void scsi_read_data(SCSIRequest *req)
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{
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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SCSIDevice *s = r->req.dev;
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int ret;
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trace_scsi_generic_read_data(req->tag);
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/* The request is used as the AIO opaque value, so add a ref. */
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scsi_req_ref(&r->req);
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if (r->len == -1) {
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scsi_command_complete_noio(r, 0);
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return;
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}
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ret = execute_command(s->conf.blk, r, SG_DXFER_FROM_DEV,
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scsi_read_complete);
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if (ret < 0) {
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scsi_command_complete_noio(r, ret);
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}
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}
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static void scsi_write_complete(void * opaque, int ret)
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{
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SCSIGenericReq *r = (SCSIGenericReq *)opaque;
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SCSIDevice *s = r->req.dev;
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trace_scsi_generic_write_complete(ret);
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assert(r->req.aiocb != NULL);
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r->req.aiocb = NULL;
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aio_context_acquire(blk_get_aio_context(s->conf.blk));
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if (ret || r->req.io_canceled) {
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scsi_command_complete_noio(r, ret);
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goto done;
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}
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if (r->req.cmd.buf[0] == MODE_SELECT && r->req.cmd.buf[4] == 12 &&
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s->type == TYPE_TAPE) {
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s->blocksize = (r->buf[9] << 16) | (r->buf[10] << 8) | r->buf[11];
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trace_scsi_generic_write_complete_blocksize(s->blocksize);
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}
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scsi_command_complete_noio(r, ret);
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done:
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aio_context_release(blk_get_aio_context(s->conf.blk));
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}
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/* Write data to a scsi device. Returns nonzero on failure.
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The transfer may complete asynchronously. */
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static void scsi_write_data(SCSIRequest *req)
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{
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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SCSIDevice *s = r->req.dev;
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int ret;
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trace_scsi_generic_write_data(req->tag);
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if (r->len == 0) {
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r->len = r->buflen;
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scsi_req_data(&r->req, r->len);
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return;
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}
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/* The request is used as the AIO opaque value, so add a ref. */
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scsi_req_ref(&r->req);
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ret = execute_command(s->conf.blk, r, SG_DXFER_TO_DEV, scsi_write_complete);
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if (ret < 0) {
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scsi_command_complete_noio(r, ret);
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}
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}
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/* Return a pointer to the data buffer. */
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static uint8_t *scsi_get_buf(SCSIRequest *req)
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{
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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return r->buf;
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}
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static void scsi_generic_command_dump(uint8_t *cmd, int len)
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{
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int i;
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char *line_buffer, *p;
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line_buffer = g_malloc(len * 5 + 1);
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for (i = 0, p = line_buffer; i < len; i++) {
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p += sprintf(p, " 0x%02x", cmd[i]);
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}
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trace_scsi_generic_send_command(line_buffer);
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g_free(line_buffer);
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}
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/* Execute a scsi command. Returns the length of the data expected by the
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command. This will be Positive for data transfers from the device
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(eg. disk reads), negative for transfers to the device (eg. disk writes),
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and zero if the command does not transfer any data. */
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static int32_t scsi_send_command(SCSIRequest *req, uint8_t *cmd)
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{
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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SCSIDevice *s = r->req.dev;
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int ret;
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if (trace_event_get_state_backends(TRACE_SCSI_GENERIC_SEND_COMMAND)) {
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scsi_generic_command_dump(cmd, r->req.cmd.len);
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}
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if (r->req.cmd.xfer == 0) {
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g_free(r->buf);
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r->buflen = 0;
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r->buf = NULL;
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/* The request is used as the AIO opaque value, so add a ref. */
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scsi_req_ref(&r->req);
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ret = execute_command(s->conf.blk, r, SG_DXFER_NONE,
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scsi_command_complete);
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if (ret < 0) {
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scsi_command_complete_noio(r, ret);
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return 0;
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}
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return 0;
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}
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if (r->buflen != r->req.cmd.xfer) {
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g_free(r->buf);
|
|
r->buf = g_malloc(r->req.cmd.xfer);
|
|
r->buflen = r->req.cmd.xfer;
|
|
}
|
|
|
|
memset(r->buf, 0, r->buflen);
|
|
r->len = r->req.cmd.xfer;
|
|
if (r->req.cmd.mode == SCSI_XFER_TO_DEV) {
|
|
r->len = 0;
|
|
return -r->req.cmd.xfer;
|
|
} else {
|
|
return r->req.cmd.xfer;
|
|
}
|
|
}
|
|
|
|
static int read_naa_id(const uint8_t *p, uint64_t *p_wwn)
|
|
{
|
|
int i;
|
|
|
|
if ((p[1] & 0xF) == 3) {
|
|
/* NAA designator type */
|
|
if (p[3] != 8) {
|
|
return -EINVAL;
|
|
}
|
|
*p_wwn = ldq_be_p(p + 4);
|
|
return 0;
|
|
}
|
|
|
|
if ((p[1] & 0xF) == 8) {
|
|
/* SCSI name string designator type */
|
|
if (p[3] < 20 || memcmp(&p[4], "naa.", 4)) {
|
|
return -EINVAL;
|
|
}
|
|
if (p[3] > 20 && p[24] != ',') {
|
|
return -EINVAL;
|
|
}
|
|
*p_wwn = 0;
|
|
for (i = 8; i < 24; i++) {
|
|
char c = qemu_toupper(p[i]);
|
|
c -= (c >= '0' && c <= '9' ? '0' : 'A' - 10);
|
|
*p_wwn = (*p_wwn << 4) | c;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
int scsi_SG_IO_FROM_DEV(BlockBackend *blk, uint8_t *cmd, uint8_t cmd_size,
|
|
uint8_t *buf, uint8_t buf_size)
|
|
{
|
|
sg_io_hdr_t io_header;
|
|
uint8_t sensebuf[8];
|
|
int ret;
|
|
|
|
memset(&io_header, 0, sizeof(io_header));
|
|
io_header.interface_id = 'S';
|
|
io_header.dxfer_direction = SG_DXFER_FROM_DEV;
|
|
io_header.dxfer_len = buf_size;
|
|
io_header.dxferp = buf;
|
|
io_header.cmdp = cmd;
|
|
io_header.cmd_len = cmd_size;
|
|
io_header.mx_sb_len = sizeof(sensebuf);
|
|
io_header.sbp = sensebuf;
|
|
io_header.timeout = 6000; /* XXX */
|
|
|
|
ret = blk_ioctl(blk, SG_IO, &io_header);
|
|
if (ret < 0 || io_header.driver_status || io_header.host_status) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Executes an INQUIRY request with EVPD set to retrieve the
|
|
* available VPD pages of the device. If the device does
|
|
* not support the Block Limits page (page 0xb0), set
|
|
* the needs_vpd_bl_emulation flag for future use.
|
|
*/
|
|
static void scsi_generic_set_vpd_bl_emulation(SCSIDevice *s)
|
|
{
|
|
uint8_t cmd[6];
|
|
uint8_t buf[250];
|
|
uint8_t page_len;
|
|
int ret, i;
|
|
|
|
memset(cmd, 0, sizeof(cmd));
|
|
memset(buf, 0, sizeof(buf));
|
|
cmd[0] = INQUIRY;
|
|
cmd[1] = 1;
|
|
cmd[2] = 0x00;
|
|
cmd[4] = sizeof(buf);
|
|
|
|
ret = scsi_SG_IO_FROM_DEV(s->conf.blk, cmd, sizeof(cmd),
|
|
buf, sizeof(buf));
|
|
if (ret < 0) {
|
|
/*
|
|
* Do not assume anything if we can't retrieve the
|
|
* INQUIRY response to assert the VPD Block Limits
|
|
* support.
|
|
*/
|
|
s->needs_vpd_bl_emulation = false;
|
|
return;
|
|
}
|
|
|
|
page_len = buf[3];
|
|
for (i = 4; i < MIN(sizeof(buf), page_len + 4); i++) {
|
|
if (buf[i] == 0xb0) {
|
|
s->needs_vpd_bl_emulation = false;
|
|
return;
|
|
}
|
|
}
|
|
s->needs_vpd_bl_emulation = true;
|
|
}
|
|
|
|
static void scsi_generic_read_device_identification(SCSIDevice *s)
|
|
{
|
|
uint8_t cmd[6];
|
|
uint8_t buf[250];
|
|
int ret;
|
|
int i, len;
|
|
|
|
memset(cmd, 0, sizeof(cmd));
|
|
memset(buf, 0, sizeof(buf));
|
|
cmd[0] = INQUIRY;
|
|
cmd[1] = 1;
|
|
cmd[2] = 0x83;
|
|
cmd[4] = sizeof(buf);
|
|
|
|
ret = scsi_SG_IO_FROM_DEV(s->conf.blk, cmd, sizeof(cmd),
|
|
buf, sizeof(buf));
|
|
if (ret < 0) {
|
|
return;
|
|
}
|
|
|
|
len = MIN((buf[2] << 8) | buf[3], sizeof(buf) - 4);
|
|
for (i = 0; i + 3 <= len; ) {
|
|
const uint8_t *p = &buf[i + 4];
|
|
uint64_t wwn;
|
|
|
|
if (i + (p[3] + 4) > len) {
|
|
break;
|
|
}
|
|
|
|
if ((p[1] & 0x10) == 0) {
|
|
/* Associated with the logical unit */
|
|
if (read_naa_id(p, &wwn) == 0) {
|
|
s->wwn = wwn;
|
|
}
|
|
} else if ((p[1] & 0x10) == 0x10) {
|
|
/* Associated with the target port */
|
|
if (read_naa_id(p, &wwn) == 0) {
|
|
s->port_wwn = wwn;
|
|
}
|
|
}
|
|
|
|
i += p[3] + 4;
|
|
}
|
|
}
|
|
|
|
void scsi_generic_read_device_inquiry(SCSIDevice *s)
|
|
{
|
|
scsi_generic_read_device_identification(s);
|
|
if (s->type == TYPE_DISK || s->type == TYPE_ZBC) {
|
|
scsi_generic_set_vpd_bl_emulation(s);
|
|
} else {
|
|
s->needs_vpd_bl_emulation = false;
|
|
}
|
|
}
|
|
|
|
static int get_stream_blocksize(BlockBackend *blk)
|
|
{
|
|
uint8_t cmd[6];
|
|
uint8_t buf[12];
|
|
int ret;
|
|
|
|
memset(cmd, 0, sizeof(cmd));
|
|
memset(buf, 0, sizeof(buf));
|
|
cmd[0] = MODE_SENSE;
|
|
cmd[4] = sizeof(buf);
|
|
|
|
ret = scsi_SG_IO_FROM_DEV(blk, cmd, sizeof(cmd), buf, sizeof(buf));
|
|
if (ret < 0) {
|
|
return -1;
|
|
}
|
|
|
|
return (buf[9] << 16) | (buf[10] << 8) | buf[11];
|
|
}
|
|
|
|
static void scsi_generic_reset(DeviceState *dev)
|
|
{
|
|
SCSIDevice *s = SCSI_DEVICE(dev);
|
|
|
|
s->scsi_version = s->default_scsi_version;
|
|
scsi_device_purge_requests(s, SENSE_CODE(RESET));
|
|
}
|
|
|
|
static void scsi_generic_realize(SCSIDevice *s, Error **errp)
|
|
{
|
|
int rc;
|
|
int sg_version;
|
|
struct sg_scsi_id scsiid;
|
|
|
|
if (!s->conf.blk) {
|
|
error_setg(errp, "drive property not set");
|
|
return;
|
|
}
|
|
|
|
if (blk_get_on_error(s->conf.blk, 0) != BLOCKDEV_ON_ERROR_ENOSPC) {
|
|
error_setg(errp, "Device doesn't support drive option werror");
|
|
return;
|
|
}
|
|
if (blk_get_on_error(s->conf.blk, 1) != BLOCKDEV_ON_ERROR_REPORT) {
|
|
error_setg(errp, "Device doesn't support drive option rerror");
|
|
return;
|
|
}
|
|
|
|
/* check we are using a driver managing SG_IO (version 3 and after */
|
|
rc = blk_ioctl(s->conf.blk, SG_GET_VERSION_NUM, &sg_version);
|
|
if (rc < 0) {
|
|
error_setg_errno(errp, -rc, "cannot get SG_IO version number");
|
|
if (rc != -EPERM) {
|
|
error_append_hint(errp, "Is this a SCSI device?\n");
|
|
}
|
|
return;
|
|
}
|
|
if (sg_version < 30000) {
|
|
error_setg(errp, "scsi generic interface too old");
|
|
return;
|
|
}
|
|
|
|
/* get LUN of the /dev/sg? */
|
|
if (blk_ioctl(s->conf.blk, SG_GET_SCSI_ID, &scsiid)) {
|
|
error_setg(errp, "SG_GET_SCSI_ID ioctl failed");
|
|
return;
|
|
}
|
|
if (!blkconf_apply_backend_options(&s->conf,
|
|
blk_is_read_only(s->conf.blk),
|
|
true, errp)) {
|
|
return;
|
|
}
|
|
|
|
/* define device state */
|
|
s->type = scsiid.scsi_type;
|
|
trace_scsi_generic_realize_type(s->type);
|
|
|
|
switch (s->type) {
|
|
case TYPE_TAPE:
|
|
s->blocksize = get_stream_blocksize(s->conf.blk);
|
|
if (s->blocksize == -1) {
|
|
s->blocksize = 0;
|
|
}
|
|
break;
|
|
|
|
/* Make a guess for block devices, we'll fix it when the guest sends.
|
|
* READ CAPACITY. If they don't, they likely would assume these sizes
|
|
* anyway. (TODO: they could also send MODE SENSE).
|
|
*/
|
|
case TYPE_ROM:
|
|
case TYPE_WORM:
|
|
s->blocksize = 2048;
|
|
break;
|
|
default:
|
|
s->blocksize = 512;
|
|
break;
|
|
}
|
|
|
|
trace_scsi_generic_realize_blocksize(s->blocksize);
|
|
|
|
/* Only used by scsi-block, but initialize it nevertheless to be clean. */
|
|
s->default_scsi_version = -1;
|
|
scsi_generic_read_device_inquiry(s);
|
|
}
|
|
|
|
const SCSIReqOps scsi_generic_req_ops = {
|
|
.size = sizeof(SCSIGenericReq),
|
|
.free_req = scsi_free_request,
|
|
.send_command = scsi_send_command,
|
|
.read_data = scsi_read_data,
|
|
.write_data = scsi_write_data,
|
|
.get_buf = scsi_get_buf,
|
|
.load_request = scsi_generic_load_request,
|
|
.save_request = scsi_generic_save_request,
|
|
};
|
|
|
|
static SCSIRequest *scsi_new_request(SCSIDevice *d, uint32_t tag, uint32_t lun,
|
|
uint8_t *buf, void *hba_private)
|
|
{
|
|
return scsi_req_alloc(&scsi_generic_req_ops, d, tag, lun, hba_private);
|
|
}
|
|
|
|
static Property scsi_generic_properties[] = {
|
|
DEFINE_PROP_DRIVE("drive", SCSIDevice, conf.blk),
|
|
DEFINE_PROP_BOOL("share-rw", SCSIDevice, conf.share_rw, false),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static int scsi_generic_parse_cdb(SCSIDevice *dev, SCSICommand *cmd,
|
|
uint8_t *buf, void *hba_private)
|
|
{
|
|
return scsi_bus_parse_cdb(dev, cmd, buf, hba_private);
|
|
}
|
|
|
|
static void scsi_generic_class_initfn(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
SCSIDeviceClass *sc = SCSI_DEVICE_CLASS(klass);
|
|
|
|
sc->realize = scsi_generic_realize;
|
|
sc->alloc_req = scsi_new_request;
|
|
sc->parse_cdb = scsi_generic_parse_cdb;
|
|
dc->fw_name = "disk";
|
|
dc->desc = "pass through generic scsi device (/dev/sg*)";
|
|
dc->reset = scsi_generic_reset;
|
|
device_class_set_props(dc, scsi_generic_properties);
|
|
dc->vmsd = &vmstate_scsi_device;
|
|
}
|
|
|
|
static const TypeInfo scsi_generic_info = {
|
|
.name = "scsi-generic",
|
|
.parent = TYPE_SCSI_DEVICE,
|
|
.instance_size = sizeof(SCSIDevice),
|
|
.class_init = scsi_generic_class_initfn,
|
|
};
|
|
|
|
static void scsi_generic_register_types(void)
|
|
{
|
|
type_register_static(&scsi_generic_info);
|
|
}
|
|
|
|
type_init(scsi_generic_register_types)
|
|
|
|
#endif /* __linux__ */
|