diff options
| -rw-r--r-- | hw/scsi/scsi-disk.c | 214 |
1 files changed, 196 insertions, 18 deletions
diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c index 4684888daf..ace65e0720 100644 --- a/hw/scsi/scsi-disk.c +++ b/hw/scsi/scsi-disk.c @@ -80,6 +80,7 @@ typedef struct SCSIDiskReq { struct iovec iov; QEMUIOVector qiov; BlockAcctCookie acct; + unsigned char *status; } SCSIDiskReq; #define SCSI_DISK_F_REMOVABLE 0 @@ -187,6 +188,15 @@ static bool scsi_disk_req_check_error(SCSIDiskReq *r, int ret, bool acct_failed) return scsi_handle_rw_error(r, -ret, acct_failed); } + if (r->status && *r->status) { + if (acct_failed) { + SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev); + block_acct_failed(blk_get_stats(s->qdev.conf.blk), &r->acct); + } + scsi_req_complete(&r->req, *r->status); + return true; + } + return false; } @@ -2552,16 +2562,145 @@ static void scsi_block_realize(SCSIDevice *dev, Error **errp) scsi_generic_read_device_identification(&s->qdev); } +typedef struct SCSIBlockReq { + SCSIDiskReq req; + sg_io_hdr_t io_header; + + /* Selected bytes of the original CDB, copied into our own CDB. */ + uint8_t cmd, cdb1, group_number; + + /* CDB passed to SG_IO. */ + uint8_t cdb[16]; +} SCSIBlockReq; + +static BlockAIOCB *scsi_block_do_sgio(SCSIBlockReq *req, + int64_t offset, QEMUIOVector *iov, + int direction, + BlockCompletionFunc *cb, void *opaque) +{ + sg_io_hdr_t *io_header = &req->io_header; + SCSIDiskReq *r = &req->req; + SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev); + int nb_logical_blocks; + uint64_t lba; + BlockAIOCB *aiocb; + + /* This is not supported yet. It can only happen if the guest does + * reads and writes that are not aligned to one logical sectors + * _and_ cover multiple MemoryRegions. + */ + assert(offset % s->qdev.blocksize == 0); + assert(iov->size % s->qdev.blocksize == 0); + + io_header->interface_id = 'S'; + + /* The data transfer comes from the QEMUIOVector. */ + io_header->dxfer_direction = direction; + io_header->dxfer_len = iov->size; + io_header->dxferp = (void *)iov->iov; + io_header->iovec_count = iov->niov; + assert(io_header->iovec_count == iov->niov); /* no overflow! */ + + /* Build a new CDB with the LBA and length patched in, in case + * DMA helpers split the transfer in multiple segments. Do not + * build a CDB smaller than what the guest wanted, and only build + * a larger one if strictly necessary. + */ + io_header->cmdp = req->cdb; + lba = offset / s->qdev.blocksize; + nb_logical_blocks = io_header->dxfer_len / s->qdev.blocksize; + + if ((req->cmd >> 5) == 0 && lba <= 0x1ffff) { + /* 6-byte CDB */ + stl_be_p(&req->cdb[0], lba | (req->cmd << 24)); + req->cdb[4] = nb_logical_blocks; + req->cdb[5] = 0; + io_header->cmd_len = 6; + } else if ((req->cmd >> 5) <= 1 && lba <= 0xffffffffULL) { + /* 10-byte CDB */ + req->cdb[0] = (req->cmd & 0x1f) | 0x20; + req->cdb[1] = req->cdb1; + stl_be_p(&req->cdb[2], lba); + req->cdb[6] = req->group_number; + stw_be_p(&req->cdb[7], nb_logical_blocks); + req->cdb[9] = 0; + io_header->cmd_len = 10; + } else if ((req->cmd >> 5) != 4 && lba <= 0xffffffffULL) { + /* 12-byte CDB */ + req->cdb[0] = (req->cmd & 0x1f) | 0xA0; + req->cdb[1] = req->cdb1; + stl_be_p(&req->cdb[2], lba); + stl_be_p(&req->cdb[6], nb_logical_blocks); + req->cdb[10] = req->group_number; + req->cdb[11] = 0; + io_header->cmd_len = 12; + } else { + /* 16-byte CDB */ + req->cdb[0] = (req->cmd & 0x1f) | 0x80; + req->cdb[1] = req->cdb1; + stq_be_p(&req->cdb[2], lba); + stl_be_p(&req->cdb[10], nb_logical_blocks); + req->cdb[14] = req->group_number; + req->cdb[15] = 0; + io_header->cmd_len = 16; + } + + /* The rest is as in scsi-generic.c. */ + io_header->mx_sb_len = sizeof(r->req.sense); + io_header->sbp = r->req.sense; + io_header->timeout = UINT_MAX; + io_header->usr_ptr = r; + io_header->flags |= SG_FLAG_DIRECT_IO; + + aiocb = blk_aio_ioctl(s->qdev.conf.blk, SG_IO, io_header, cb, opaque); + assert(aiocb != NULL); + return aiocb; +} + +static bool scsi_block_no_fua(SCSICommand *cmd) +{ + return false; +} + +static BlockAIOCB *scsi_block_dma_readv(int64_t offset, + QEMUIOVector *iov, + BlockCompletionFunc *cb, void *cb_opaque, + void *opaque) +{ + SCSIBlockReq *r = opaque; + return scsi_block_do_sgio(r, offset, iov, + SG_DXFER_FROM_DEV, cb, cb_opaque); +} + +static BlockAIOCB *scsi_block_dma_writev(int64_t offset, + QEMUIOVector *iov, + BlockCompletionFunc *cb, void *cb_opaque, + void *opaque) +{ + SCSIBlockReq *r = opaque; + return scsi_block_do_sgio(r, offset, iov, + SG_DXFER_TO_DEV, cb, cb_opaque); +} + static bool scsi_block_is_passthrough(SCSIDiskState *s, uint8_t *buf) { switch (buf[0]) { + case VERIFY_10: + case VERIFY_12: + case VERIFY_16: + /* Check if BYTCHK == 0x01 (data-out buffer contains data + * for the number of logical blocks specified in the length + * field). For other modes, do not use scatter/gather operation. + */ + if ((buf[1] & 6) != 2) { + return false; + } + break; + case READ_6: case READ_10: case READ_12: case READ_16: - case VERIFY_10: - case VERIFY_12: - case VERIFY_16: case WRITE_6: case WRITE_10: case WRITE_12: @@ -2569,21 +2708,8 @@ static bool scsi_block_is_passthrough(SCSIDiskState *s, uint8_t *buf) case WRITE_VERIFY_10: case WRITE_VERIFY_12: case WRITE_VERIFY_16: - /* If we are not using O_DIRECT, we might read stale data from the - * host cache if writes were made using other commands than these - * ones (such as WRITE SAME or EXTENDED COPY, etc.). So, without - * O_DIRECT everything must go through SG_IO. - */ - if (!(blk_get_flags(s->qdev.conf.blk) & BDRV_O_NOCACHE)) { - break; - } - - /* MMC writing cannot be done via pread/pwrite, because it sometimes + /* MMC writing cannot be done via DMA helpers, because it sometimes * involves writing beyond the maximum LBA or to negative LBA (lead-in). - * And once you do these writes, reading from the block device is - * unreliable, too. It is even possible that reads deliver random data - * from the host page cache (this is probably a Linux bug). - * * We might use scsi_disk_dma_reqops as long as no writing commands are * seen, but performance usually isn't paramount on optical media. So, * just make scsi-block operate the same as scsi-generic for them. @@ -2601,6 +2727,54 @@ static bool scsi_block_is_passthrough(SCSIDiskState *s, uint8_t *buf) } +static int32_t scsi_block_dma_command(SCSIRequest *req, uint8_t *buf) +{ + SCSIBlockReq *r = (SCSIBlockReq *)req; + r->cmd = req->cmd.buf[0]; + switch (r->cmd >> 5) { + case 0: + /* 6-byte CDB. */ + r->cdb1 = r->group_number = 0; + break; + case 1: + /* 10-byte CDB. */ + r->cdb1 = req->cmd.buf[1]; + r->group_number = req->cmd.buf[6]; + case 4: + /* 12-byte CDB. */ + r->cdb1 = req->cmd.buf[1]; + r->group_number = req->cmd.buf[10]; + break; + case 5: + /* 16-byte CDB. */ + r->cdb1 = req->cmd.buf[1]; + r->group_number = req->cmd.buf[14]; + break; + default: + abort(); + } + + if (r->cdb1 & 0xe0) { + /* Protection information is not supported. */ + scsi_check_condition(&r->req, SENSE_CODE(INVALID_FIELD)); + return 0; + } + + r->req.status = &r->io_header.status; + return scsi_disk_dma_command(req, buf); +} + +static const SCSIReqOps scsi_block_dma_reqops = { + .size = sizeof(SCSIBlockReq), + .free_req = scsi_free_request, + .send_command = scsi_block_dma_command, + .read_data = scsi_read_data, + .write_data = scsi_write_data, + .get_buf = scsi_get_buf, + .load_request = scsi_disk_load_request, + .save_request = scsi_disk_save_request, +}; + static SCSIRequest *scsi_block_new_request(SCSIDevice *d, uint32_t tag, uint32_t lun, uint8_t *buf, void *hba_private) @@ -2611,7 +2785,7 @@ static SCSIRequest *scsi_block_new_request(SCSIDevice *d, uint32_t tag, return scsi_req_alloc(&scsi_generic_req_ops, &s->qdev, tag, lun, hba_private); } else { - return scsi_req_alloc(&scsi_disk_dma_reqops, &s->qdev, tag, lun, + return scsi_req_alloc(&scsi_block_dma_reqops, &s->qdev, tag, lun, hba_private); } } @@ -2767,10 +2941,14 @@ static void scsi_block_class_initfn(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); SCSIDeviceClass *sc = SCSI_DEVICE_CLASS(klass); + SCSIDiskClass *sdc = SCSI_DISK_BASE_CLASS(klass); sc->realize = scsi_block_realize; sc->alloc_req = scsi_block_new_request; sc->parse_cdb = scsi_block_parse_cdb; + sdc->dma_readv = scsi_block_dma_readv; + sdc->dma_writev = scsi_block_dma_writev; + sdc->need_fua_emulation = scsi_block_no_fua; dc->desc = "SCSI block device passthrough"; dc->props = scsi_block_properties; dc->vmsd = &vmstate_scsi_disk_state; |