| /* |
| * Generic SCSI Device support |
| * |
| * Copyright (c) 2007 Bull S.A.S. |
| * Based on code by Paul Brook |
| * Based on code by Fabrice Bellard |
| * |
| * Written by Laurent Vivier <Laurent.Vivier@bull.net> |
| * |
| * This code is licensed under the LGPL. |
| * |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qapi/error.h" |
| #include "qemu/ctype.h" |
| #include "qemu/error-report.h" |
| #include "qemu/module.h" |
| #include "hw/scsi/scsi.h" |
| #include "migration/qemu-file-types.h" |
| #include "hw/qdev-properties.h" |
| #include "hw/qdev-properties-system.h" |
| #include "hw/scsi/emulation.h" |
| #include "sysemu/block-backend.h" |
| #include "trace.h" |
| |
| #ifdef __linux__ |
| |
| #include <scsi/sg.h> |
| #include "scsi/constants.h" |
| |
| #ifndef MAX_UINT |
| #define MAX_UINT ((unsigned int)-1) |
| #endif |
| |
| typedef struct SCSIGenericReq { |
| SCSIRequest req; |
| uint8_t *buf; |
| int buflen; |
| int len; |
| sg_io_hdr_t io_header; |
| } SCSIGenericReq; |
| |
| static void scsi_generic_save_request(QEMUFile *f, SCSIRequest *req) |
| { |
| SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); |
| |
| qemu_put_sbe32s(f, &r->buflen); |
| if (r->buflen && r->req.cmd.mode == SCSI_XFER_TO_DEV) { |
| assert(!r->req.sg); |
| qemu_put_buffer(f, r->buf, r->req.cmd.xfer); |
| } |
| } |
| |
| static void scsi_generic_load_request(QEMUFile *f, SCSIRequest *req) |
| { |
| SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); |
| |
| qemu_get_sbe32s(f, &r->buflen); |
| if (r->buflen && r->req.cmd.mode == SCSI_XFER_TO_DEV) { |
| assert(!r->req.sg); |
| qemu_get_buffer(f, r->buf, r->req.cmd.xfer); |
| } |
| } |
| |
| static void scsi_free_request(SCSIRequest *req) |
| { |
| SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); |
| |
| g_free(r->buf); |
| } |
| |
| /* Helper function for command completion. */ |
| static void scsi_command_complete_noio(SCSIGenericReq *r, int ret) |
| { |
| int status; |
| SCSISense sense; |
| sg_io_hdr_t *io_hdr = &r->io_header; |
| |
| assert(r->req.aiocb == NULL); |
| |
| if (r->req.io_canceled) { |
| scsi_req_cancel_complete(&r->req); |
| goto done; |
| } |
| if (ret < 0) { |
| status = scsi_sense_from_errno(-ret, &sense); |
| if (status == CHECK_CONDITION) { |
| scsi_req_build_sense(&r->req, sense); |
| } |
| } else if (io_hdr->host_status != SCSI_HOST_OK) { |
| scsi_req_complete_failed(&r->req, io_hdr->host_status); |
| goto done; |
| } else if (io_hdr->driver_status & SG_ERR_DRIVER_TIMEOUT) { |
| status = BUSY; |
| } else { |
| status = io_hdr->status; |
| if (io_hdr->driver_status & SG_ERR_DRIVER_SENSE) { |
| r->req.sense_len = io_hdr->sb_len_wr; |
| } |
| } |
| trace_scsi_generic_command_complete_noio(r, r->req.tag, status); |
| |
| scsi_req_complete(&r->req, status); |
| done: |
| scsi_req_unref(&r->req); |
| } |
| |
| static void scsi_command_complete(void *opaque, int ret) |
| { |
| SCSIGenericReq *r = (SCSIGenericReq *)opaque; |
| |
| assert(r->req.aiocb != NULL); |
| r->req.aiocb = NULL; |
| |
| scsi_command_complete_noio(r, ret); |
| } |
| |
| static int execute_command(BlockBackend *blk, |
| SCSIGenericReq *r, int direction, |
| BlockCompletionFunc *complete) |
| { |
| SCSIDevice *s = r->req.dev; |
| |
| r->io_header.interface_id = 'S'; |
| r->io_header.dxfer_direction = direction; |
| r->io_header.dxferp = r->buf; |
| r->io_header.dxfer_len = r->buflen; |
| r->io_header.cmdp = r->req.cmd.buf; |
| r->io_header.cmd_len = r->req.cmd.len; |
| r->io_header.mx_sb_len = sizeof(r->req.sense); |
| r->io_header.sbp = r->req.sense; |
| r->io_header.timeout = s->io_timeout * 1000; |
| r->io_header.usr_ptr = r; |
| r->io_header.flags |= SG_FLAG_DIRECT_IO; |
| |
| trace_scsi_generic_aio_sgio_command(r->req.tag, r->req.cmd.buf[0], |
| r->io_header.timeout); |
| r->req.aiocb = blk_aio_ioctl(blk, SG_IO, &r->io_header, complete, r); |
| if (r->req.aiocb == NULL) { |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| static uint64_t calculate_max_transfer(SCSIDevice *s) |
| { |
| uint64_t max_transfer = blk_get_max_hw_transfer(s->conf.blk); |
| uint32_t max_iov = blk_get_max_hw_iov(s->conf.blk); |
| |
| assert(max_transfer); |
| max_transfer = MIN_NON_ZERO(max_transfer, |
| max_iov * qemu_real_host_page_size()); |
| |
| return max_transfer / s->blocksize; |
| } |
| |
| static int scsi_handle_inquiry_reply(SCSIGenericReq *r, SCSIDevice *s, int len) |
| { |
| uint8_t page, page_idx; |
| |
| /* |
| * EVPD set to zero returns the standard INQUIRY data. |
| * |
| * Check if scsi_version is unset (-1) to avoid re-defining it |
| * each time an INQUIRY with standard data is received. |
| * scsi_version is initialized with -1 in scsi_generic_reset |
| * and scsi_disk_reset, making sure that we'll set the |
| * scsi_version after a reset. If the version field of the |
| * INQUIRY response somehow changes after a guest reboot, |
| * we'll be able to keep track of it. |
| * |
| * On SCSI-2 and older, first 3 bits of byte 2 is the |
| * ANSI-approved version, while on later versions the |
| * whole byte 2 contains the version. Check if we're dealing |
| * with a newer version and, in that case, assign the |
| * whole byte. |
| */ |
| if (s->scsi_version == -1 && !(r->req.cmd.buf[1] & 0x01)) { |
| s->scsi_version = r->buf[2] & 0x07; |
| if (s->scsi_version > 2) { |
| s->scsi_version = r->buf[2]; |
| } |
| } |
| |
| if ((s->type == TYPE_DISK || s->type == TYPE_ZBC) && |
| (r->req.cmd.buf[1] & 0x01)) { |
| page = r->req.cmd.buf[2]; |
| if (page == 0xb0 && r->buflen >= 8) { |
| uint8_t buf[16] = {}; |
| uint8_t buf_used = MIN(r->buflen, 16); |
| uint64_t max_transfer = calculate_max_transfer(s); |
| |
| memcpy(buf, r->buf, buf_used); |
| stl_be_p(&buf[8], max_transfer); |
| stl_be_p(&buf[12], MIN_NON_ZERO(max_transfer, ldl_be_p(&buf[12]))); |
| memcpy(r->buf + 8, buf + 8, buf_used - 8); |
| |
| } else if (s->needs_vpd_bl_emulation && page == 0x00 && r->buflen >= 4) { |
| /* |
| * Now we're capable of supplying the VPD Block Limits |
| * response if the hardware can't. Add it in the INQUIRY |
| * Supported VPD pages response in case we are using the |
| * emulation for this device. |
| * |
| * This way, the guest kernel will be aware of the support |
| * and will use it to proper setup the SCSI device. |
| * |
| * VPD page numbers must be sorted, so insert 0xb0 at the |
| * right place with an in-place insert. When the while loop |
| * begins the device response is at r[0] to r[page_idx - 1]. |
| */ |
| page_idx = lduw_be_p(r->buf + 2) + 4; |
| page_idx = MIN(page_idx, r->buflen); |
| while (page_idx > 4 && r->buf[page_idx - 1] >= 0xb0) { |
| if (page_idx < r->buflen) { |
| r->buf[page_idx] = r->buf[page_idx - 1]; |
| } |
| page_idx--; |
| } |
| if (page_idx < r->buflen) { |
| r->buf[page_idx] = 0xb0; |
| } |
| stw_be_p(r->buf + 2, lduw_be_p(r->buf + 2) + 1); |
| |
| if (len < r->buflen) { |
| len++; |
| } |
| } |
| } |
| return len; |
| } |
| |
| static int scsi_generic_emulate_block_limits(SCSIGenericReq *r, SCSIDevice *s) |
| { |
| int len; |
| uint8_t buf[64]; |
| |
| SCSIBlockLimits bl = { |
| .max_io_sectors = calculate_max_transfer(s), |
| }; |
| |
| memset(r->buf, 0, r->buflen); |
| stb_p(buf, s->type); |
| stb_p(buf + 1, 0xb0); |
| len = scsi_emulate_block_limits(buf + 4, &bl); |
| assert(len <= sizeof(buf) - 4); |
| stw_be_p(buf + 2, len); |
| |
| memcpy(r->buf, buf, MIN(r->buflen, len + 4)); |
| |
| r->io_header.sb_len_wr = 0; |
| |
| /* |
| * We have valid contents in the reply buffer but the |
| * io_header can report a sense error coming from |
| * the hardware in scsi_command_complete_noio. Clean |
| * up the io_header to avoid reporting it. |
| */ |
| r->io_header.driver_status = 0; |
| r->io_header.status = 0; |
| |
| return r->buflen; |
| } |
| |
| static void scsi_read_complete(void * opaque, int ret) |
| { |
| SCSIGenericReq *r = (SCSIGenericReq *)opaque; |
| SCSIDevice *s = r->req.dev; |
| int len; |
| |
| assert(r->req.aiocb != NULL); |
| r->req.aiocb = NULL; |
| |
| if (ret || r->req.io_canceled) { |
| scsi_command_complete_noio(r, ret); |
| return; |
| } |
| |
| len = r->io_header.dxfer_len - r->io_header.resid; |
| trace_scsi_generic_read_complete(r->req.tag, len); |
| |
| r->len = -1; |
| |
| if (r->io_header.driver_status & SG_ERR_DRIVER_SENSE) { |
| SCSISense sense = |
| scsi_parse_sense_buf(r->req.sense, r->io_header.sb_len_wr); |
| |
| /* |
| * Check if this is a VPD Block Limits request that |
| * resulted in sense error but would need emulation. |
| * In this case, emulate a valid VPD response. |
| */ |
| if (sense.key == ILLEGAL_REQUEST && |
| s->needs_vpd_bl_emulation && |
| r->req.cmd.buf[0] == INQUIRY && |
| (r->req.cmd.buf[1] & 0x01) && |
| r->req.cmd.buf[2] == 0xb0) { |
| len = scsi_generic_emulate_block_limits(r, s); |
| /* |
| * It's okay to jup to req_complete: no need to |
| * let scsi_handle_inquiry_reply handle an |
| * INQUIRY VPD BL request we created manually. |
| */ |
| } |
| if (sense.key) { |
| goto req_complete; |
| } |
| } |
| |
| if (r->io_header.host_status != SCSI_HOST_OK || |
| (r->io_header.driver_status & SG_ERR_DRIVER_TIMEOUT) || |
| r->io_header.status != GOOD || |
| len == 0) { |
| scsi_command_complete_noio(r, 0); |
| return; |
| } |
| |
| /* Snoop READ CAPACITY output to set the blocksize. */ |
| if (r->req.cmd.buf[0] == READ_CAPACITY_10 && |
| (ldl_be_p(&r->buf[0]) != 0xffffffffU || s->max_lba == 0)) { |
| s->blocksize = ldl_be_p(&r->buf[4]); |
| s->max_lba = ldl_be_p(&r->buf[0]) & 0xffffffffULL; |
| } else if (r->req.cmd.buf[0] == SERVICE_ACTION_IN_16 && |
| (r->req.cmd.buf[1] & 31) == SAI_READ_CAPACITY_16) { |
| s->blocksize = ldl_be_p(&r->buf[8]); |
| s->max_lba = ldq_be_p(&r->buf[0]); |
| } |
| |
| /* |
| * Patch MODE SENSE device specific parameters if the BDS is opened |
| * readonly. |
| */ |
| if ((s->type == TYPE_DISK || s->type == TYPE_TAPE || s->type == TYPE_ZBC) && |
| !blk_is_writable(s->conf.blk) && |
| (r->req.cmd.buf[0] == MODE_SENSE || |
| r->req.cmd.buf[0] == MODE_SENSE_10) && |
| (r->req.cmd.buf[1] & 0x8) == 0) { |
| if (r->req.cmd.buf[0] == MODE_SENSE) { |
| r->buf[2] |= 0x80; |
| } else { |
| r->buf[3] |= 0x80; |
| } |
| } |
| if (r->req.cmd.buf[0] == INQUIRY) { |
| len = scsi_handle_inquiry_reply(r, s, len); |
| } |
| |
| req_complete: |
| scsi_req_data(&r->req, len); |
| scsi_req_unref(&r->req); |
| } |
| |
| /* Read more data from scsi device into buffer. */ |
| static void scsi_read_data(SCSIRequest *req) |
| { |
| SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); |
| SCSIDevice *s = r->req.dev; |
| int ret; |
| |
| trace_scsi_generic_read_data(req->tag); |
| |
| /* The request is used as the AIO opaque value, so add a ref. */ |
| scsi_req_ref(&r->req); |
| if (r->len == -1) { |
| scsi_command_complete_noio(r, 0); |
| return; |
| } |
| |
| ret = execute_command(s->conf.blk, r, SG_DXFER_FROM_DEV, |
| scsi_read_complete); |
| if (ret < 0) { |
| scsi_command_complete_noio(r, ret); |
| } |
| } |
| |
| static void scsi_write_complete(void * opaque, int ret) |
| { |
| SCSIGenericReq *r = (SCSIGenericReq *)opaque; |
| SCSIDevice *s = r->req.dev; |
| |
| trace_scsi_generic_write_complete(ret); |
| |
| assert(r->req.aiocb != NULL); |
| r->req.aiocb = NULL; |
| |
| if (ret || r->req.io_canceled) { |
| scsi_command_complete_noio(r, ret); |
| return; |
| } |
| |
| if (r->req.cmd.buf[0] == MODE_SELECT && r->req.cmd.buf[4] == 12 && |
| s->type == TYPE_TAPE) { |
| s->blocksize = (r->buf[9] << 16) | (r->buf[10] << 8) | r->buf[11]; |
| trace_scsi_generic_write_complete_blocksize(s->blocksize); |
| } |
| |
| scsi_command_complete_noio(r, ret); |
| } |
| |
| /* Write data to a scsi device. Returns nonzero on failure. |
| The transfer may complete asynchronously. */ |
| static void scsi_write_data(SCSIRequest *req) |
| { |
| SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); |
| SCSIDevice *s = r->req.dev; |
| int ret; |
| |
| trace_scsi_generic_write_data(req->tag); |
| if (r->len == 0) { |
| r->len = r->buflen; |
| scsi_req_data(&r->req, r->len); |
| return; |
| } |
| |
| /* The request is used as the AIO opaque value, so add a ref. */ |
| scsi_req_ref(&r->req); |
| ret = execute_command(s->conf.blk, r, SG_DXFER_TO_DEV, scsi_write_complete); |
| if (ret < 0) { |
| scsi_command_complete_noio(r, ret); |
| } |
| } |
| |
| /* Return a pointer to the data buffer. */ |
| static uint8_t *scsi_get_buf(SCSIRequest *req) |
| { |
| SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); |
| |
| return r->buf; |
| } |
| |
| static void scsi_generic_command_dump(uint8_t *cmd, int len) |
| { |
| int i; |
| char *line_buffer, *p; |
| |
| line_buffer = g_malloc(len * 5 + 1); |
| |
| for (i = 0, p = line_buffer; i < len; i++) { |
| p += sprintf(p, " 0x%02x", cmd[i]); |
| } |
| trace_scsi_generic_send_command(line_buffer); |
| |
| g_free(line_buffer); |
| } |
| |
| /* Execute a scsi command. Returns the length of the data expected by the |
| command. This will be Positive for data transfers from the device |
| (eg. disk reads), negative for transfers to the device (eg. disk writes), |
| and zero if the command does not transfer any data. */ |
| |
| static int32_t scsi_send_command(SCSIRequest *req, uint8_t *cmd) |
| { |
| SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); |
| SCSIDevice *s = r->req.dev; |
| int ret; |
| |
| if (trace_event_get_state_backends(TRACE_SCSI_GENERIC_SEND_COMMAND)) { |
| scsi_generic_command_dump(cmd, r->req.cmd.len); |
| } |
| |
| if (r->req.cmd.xfer == 0) { |
| g_free(r->buf); |
| r->buflen = 0; |
| r->buf = NULL; |
| /* The request is used as the AIO opaque value, so add a ref. */ |
| scsi_req_ref(&r->req); |
| ret = execute_command(s->conf.blk, r, SG_DXFER_NONE, |
| scsi_command_complete); |
| if (ret < 0) { |
| scsi_command_complete_noio(r, ret); |
| return 0; |
| } |
| return 0; |
| } |
| |
| if (r->buflen != r->req.cmd.xfer) { |
| 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, uint32_t timeout) |
| { |
| 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 = timeout * 1000; |
| |
| trace_scsi_generic_ioctl_sgio_command(cmd[0], io_header.timeout); |
| ret = blk_ioctl(blk, SG_IO, &io_header); |
| if (ret < 0 || io_header.status || |
| io_header.driver_status || io_header.host_status) { |
| trace_scsi_generic_ioctl_sgio_done(cmd[0], ret, io_header.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), s->io_timeout); |
| 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), s->io_timeout); |
| 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), 6); |
| 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 && |
| blk_get_on_error(s->conf.blk, 0) != BLOCKDEV_ON_ERROR_REPORT) { |
| 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_supports_write_perm(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_UINT32("io_timeout", SCSIDevice, io_timeout, |
| DEFAULT_IO_TIMEOUT), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static int scsi_generic_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, |
| uint8_t *buf, size_t buf_len, |
| void *hba_private) |
| { |
| return scsi_bus_parse_cdb(dev, cmd, buf, buf_len, 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*)"; |
| device_class_set_legacy_reset(dc, 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__ */ |
