/* * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator * * PAPR Virtual SCSI, aka ibmvscsi * * Copyright (c) 2010,2011 Benjamin Herrenschmidt, IBM Corporation. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * * TODO: * * - Cleanups :-) * - Sort out better how to assign devices to VSCSI instances * - Fix residual counts * - Add indirect descriptors support * - Maybe do autosense (PAPR seems to mandate it, linux doesn't care) */ #include "qemu/osdep.h" #include "qemu/module.h" #include "hw/scsi/scsi.h" #include "migration/vmstate.h" #include "scsi/constants.h" #include "srp.h" #include "hw/ppc/spapr.h" #include "hw/ppc/spapr_vio.h" #include "hw/qdev-properties.h" #include "viosrp.h" #include "trace.h" #include #include "qom/object.h" /* * Virtual SCSI device */ /* Random numbers */ #define VSCSI_MAX_SECTORS 4096 #define VSCSI_REQ_LIMIT 24 /* Maximum size of a IU payload */ #define SRP_MAX_IU_DATA_LEN (SRP_MAX_IU_LEN - sizeof(union srp_iu)) #define SRP_RSP_SENSE_DATA_LEN 18 #define SRP_REPORT_LUNS_WLUN 0xc10100000000000ULL typedef union vscsi_crq { struct viosrp_crq s; uint8_t raw[16]; } vscsi_crq; typedef struct vscsi_req { vscsi_crq crq; uint8_t viosrp_iu_buf[SRP_MAX_IU_LEN]; /* SCSI request tracking */ SCSIRequest *sreq; uint32_t qtag; /* qemu tag != srp tag */ bool active; bool writing; bool dma_error; uint32_t data_len; uint32_t senselen; uint8_t sense[SCSI_SENSE_BUF_SIZE]; /* RDMA related bits */ uint8_t dma_fmt; uint16_t local_desc; uint16_t total_desc; uint16_t cdb_offset; uint16_t cur_desc_num; uint16_t cur_desc_offset; } vscsi_req; #define TYPE_VIO_SPAPR_VSCSI_DEVICE "spapr-vscsi" OBJECT_DECLARE_SIMPLE_TYPE(VSCSIState, VIO_SPAPR_VSCSI_DEVICE) struct VSCSIState { SpaprVioDevice vdev; SCSIBus bus; vscsi_req reqs[VSCSI_REQ_LIMIT]; }; static union viosrp_iu *req_iu(vscsi_req *req) { return (union viosrp_iu *)req->viosrp_iu_buf; } static struct vscsi_req *vscsi_get_req(VSCSIState *s) { vscsi_req *req; int i; for (i = 0; i < VSCSI_REQ_LIMIT; i++) { req = &s->reqs[i]; if (!req->active) { memset(req, 0, sizeof(*req)); req->qtag = i; req->active = 1; return req; } } return NULL; } static struct vscsi_req *vscsi_find_req(VSCSIState *s, uint64_t srp_tag) { vscsi_req *req; int i; for (i = 0; i < VSCSI_REQ_LIMIT; i++) { req = &s->reqs[i]; if (req_iu(req)->srp.cmd.tag == srp_tag) { return req; } } return NULL; } static void vscsi_put_req(vscsi_req *req) { if (req->sreq != NULL) { scsi_req_unref(req->sreq); } req->sreq = NULL; req->active = 0; } static SCSIDevice *vscsi_device_find(SCSIBus *bus, uint64_t srp_lun, int *lun) { int channel = 0, id = 0; retry: switch (srp_lun >> 62) { case 0: if ((srp_lun >> 56) != 0) { channel = (srp_lun >> 56) & 0x3f; id = (srp_lun >> 48) & 0xff; srp_lun <<= 16; goto retry; } *lun = (srp_lun >> 48) & 0xff; break; case 1: *lun = (srp_lun >> 48) & 0x3fff; break; case 2: channel = (srp_lun >> 53) & 0x7; id = (srp_lun >> 56) & 0x3f; *lun = (srp_lun >> 48) & 0x1f; break; case 3: *lun = -1; return NULL; default: abort(); } return scsi_device_find(bus, channel, id, *lun); } static int vscsi_send_iu(VSCSIState *s, vscsi_req *req, uint64_t length, uint8_t format) { long rc, rc1; assert(length <= SRP_MAX_IU_LEN); /* First copy the SRP */ rc = spapr_vio_dma_write(&s->vdev, req->crq.s.IU_data_ptr, &req->viosrp_iu_buf, length); if (rc) { fprintf(stderr, "vscsi_send_iu: DMA write failure !\n"); } req->crq.s.valid = 0x80; req->crq.s.format = format; req->crq.s.reserved = 0x00; req->crq.s.timeout = cpu_to_be16(0x0000); req->crq.s.IU_length = cpu_to_be16(length); req->crq.s.IU_data_ptr = req_iu(req)->srp.rsp.tag; /* right byte order */ if (rc == 0) { req->crq.s.status = VIOSRP_OK; } else { req->crq.s.status = VIOSRP_ADAPTER_FAIL; } rc1 = spapr_vio_send_crq(&s->vdev, req->crq.raw); if (rc1) { fprintf(stderr, "vscsi_send_iu: Error sending response\n"); return rc1; } return rc; } static void vscsi_makeup_sense(VSCSIState *s, vscsi_req *req, uint8_t key, uint8_t asc, uint8_t ascq) { req->senselen = SRP_RSP_SENSE_DATA_LEN; /* Valid bit and 'current errors' */ req->sense[0] = (0x1 << 7 | 0x70); /* Sense key */ req->sense[2] = key; /* Additional sense length */ req->sense[7] = 0xa; /* 10 bytes */ /* Additional sense code */ req->sense[12] = asc; req->sense[13] = ascq; } static int vscsi_send_rsp(VSCSIState *s, vscsi_req *req, uint8_t status, int32_t res_in, int32_t res_out) { union viosrp_iu *iu = req_iu(req); uint64_t tag = iu->srp.rsp.tag; int total_len = sizeof(iu->srp.rsp); uint8_t sol_not = iu->srp.cmd.sol_not; trace_spapr_vscsi_send_rsp(status, res_in, res_out); memset(iu, 0, sizeof(struct srp_rsp)); iu->srp.rsp.opcode = SRP_RSP; iu->srp.rsp.req_lim_delta = cpu_to_be32(1); iu->srp.rsp.tag = tag; /* Handle residuals */ if (res_in < 0) { iu->srp.rsp.flags |= SRP_RSP_FLAG_DIUNDER; res_in = -res_in; } else if (res_in) { iu->srp.rsp.flags |= SRP_RSP_FLAG_DIOVER; } if (res_out < 0) { iu->srp.rsp.flags |= SRP_RSP_FLAG_DOUNDER; res_out = -res_out; } else if (res_out) { iu->srp.rsp.flags |= SRP_RSP_FLAG_DOOVER; } iu->srp.rsp.data_in_res_cnt = cpu_to_be32(res_in); iu->srp.rsp.data_out_res_cnt = cpu_to_be32(res_out); /* We don't do response data */ /* iu->srp.rsp.flags &= ~SRP_RSP_FLAG_RSPVALID; */ iu->srp.rsp.resp_data_len = cpu_to_be32(0); /* Handle success vs. failure */ iu->srp.rsp.status = status; if (status) { iu->srp.rsp.sol_not = (sol_not & 0x04) >> 2; if (req->senselen) { int sense_data_len = MIN(req->senselen, SRP_MAX_IU_DATA_LEN); iu->srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID; iu->srp.rsp.sense_data_len = cpu_to_be32(sense_data_len); memcpy(iu->srp.rsp.data, req->sense, sense_data_len); total_len += sense_data_len; } } else { iu->srp.rsp.sol_not = (sol_not & 0x02) >> 1; } vscsi_send_iu(s, req, total_len, VIOSRP_SRP_FORMAT); return 0; } static inline struct srp_direct_buf vscsi_swap_desc(struct srp_direct_buf desc) { desc.va = be64_to_cpu(desc.va); desc.len = be32_to_cpu(desc.len); return desc; } static int vscsi_fetch_desc(VSCSIState *s, struct vscsi_req *req, unsigned n, unsigned buf_offset, struct srp_direct_buf *ret) { struct srp_cmd *cmd = &req_iu(req)->srp.cmd; switch (req->dma_fmt) { case SRP_NO_DATA_DESC: { trace_spapr_vscsi_fetch_desc_no_data(); return 0; } case SRP_DATA_DESC_DIRECT: { memcpy(ret, cmd->add_data + req->cdb_offset, sizeof(*ret)); assert(req->cur_desc_num == 0); trace_spapr_vscsi_fetch_desc_direct(); break; } case SRP_DATA_DESC_INDIRECT: { struct srp_indirect_buf *tmp = (struct srp_indirect_buf *) (cmd->add_data + req->cdb_offset); if (n < req->local_desc) { *ret = tmp->desc_list[n]; trace_spapr_vscsi_fetch_desc_indirect(req->qtag, n, req->local_desc); } else if (n < req->total_desc) { int rc; struct srp_direct_buf tbl_desc = vscsi_swap_desc(tmp->table_desc); unsigned desc_offset = n * sizeof(struct srp_direct_buf); if (desc_offset >= tbl_desc.len) { trace_spapr_vscsi_fetch_desc_out_of_range(n, desc_offset); return -1; } rc = spapr_vio_dma_read(&s->vdev, tbl_desc.va + desc_offset, ret, sizeof(struct srp_direct_buf)); if (rc) { trace_spapr_vscsi_fetch_desc_dma_read_error(rc); return -1; } trace_spapr_vscsi_fetch_desc_indirect_seg_ext(req->qtag, n, req->total_desc, tbl_desc.va, tbl_desc.len); } else { trace_spapr_vscsi_fetch_desc_out_of_desc(); return 0; } break; } default: fprintf(stderr, "VSCSI: Unknown format %x\n", req->dma_fmt); return -1; } *ret = vscsi_swap_desc(*ret); if (buf_offset > ret->len) { trace_spapr_vscsi_fetch_desc_out_of_desc_boundary(buf_offset, req->cur_desc_num, ret->len); return -1; } ret->va += buf_offset; ret->len -= buf_offset; trace_spapr_vscsi_fetch_desc_done(req->cur_desc_num, req->cur_desc_offset, ret->va, ret->len); return ret->len ? 1 : 0; } static int vscsi_srp_direct_data(VSCSIState *s, vscsi_req *req, uint8_t *buf, uint32_t len) { struct srp_direct_buf md; uint32_t llen; int rc = 0; rc = vscsi_fetch_desc(s, req, req->cur_desc_num, req->cur_desc_offset, &md); if (rc < 0) { return -1; } else if (rc == 0) { return 0; } llen = MIN(len, md.len); if (llen) { if (req->writing) { /* writing = to device = reading from memory */ rc = spapr_vio_dma_read(&s->vdev, md.va, buf, llen); } else { rc = spapr_vio_dma_write(&s->vdev, md.va, buf, llen); } } if (rc) { return -1; } req->cur_desc_offset += llen; return llen; } static int vscsi_srp_indirect_data(VSCSIState *s, vscsi_req *req, uint8_t *buf, uint32_t len) { struct srp_direct_buf md; int rc = 0; uint32_t llen, total = 0; trace_spapr_vscsi_srp_indirect_data(len); /* While we have data ... */ while (len) { rc = vscsi_fetch_desc(s, req, req->cur_desc_num, req->cur_desc_offset, &md); if (rc < 0) { return -1; } else if (rc == 0) { break; } /* Perform transfer */ llen = MIN(len, md.len); if (req->writing) { /* writing = to device = reading from memory */ rc = spapr_vio_dma_read(&s->vdev, md.va, buf, llen); } else { rc = spapr_vio_dma_write(&s->vdev, md.va, buf, llen); } if (rc) { trace_spapr_vscsi_srp_indirect_data_rw(req->writing, rc); break; } trace_spapr_vscsi_srp_indirect_data_buf(buf[0], buf[1], buf[2], buf[3]); len -= llen; buf += llen; total += llen; /* Update current position in the current descriptor */ req->cur_desc_offset += llen; if (md.len == llen) { /* Go to the next descriptor if the current one finished */ ++req->cur_desc_num; req->cur_desc_offset = 0; } } return rc ? -1 : total; } static int vscsi_srp_transfer_data(VSCSIState *s, vscsi_req *req, int writing, uint8_t *buf, uint32_t len) { int err = 0; switch (req->dma_fmt) { case SRP_NO_DATA_DESC: trace_spapr_vscsi_srp_transfer_data(len); break; case SRP_DATA_DESC_DIRECT: err = vscsi_srp_direct_data(s, req, buf, len); break; case SRP_DATA_DESC_INDIRECT: err = vscsi_srp_indirect_data(s, req, buf, len); break; } return err; } /* Bits from linux srp */ static int data_out_desc_size(struct srp_cmd *cmd) { int size = 0; uint8_t fmt = cmd->buf_fmt >> 4; switch (fmt) { case SRP_NO_DATA_DESC: break; case SRP_DATA_DESC_DIRECT: size = sizeof(struct srp_direct_buf); break; case SRP_DATA_DESC_INDIRECT: size = sizeof(struct srp_indirect_buf) + sizeof(struct srp_direct_buf)*cmd->data_out_desc_cnt; break; default: break; } return size; } static int vscsi_preprocess_desc(vscsi_req *req) { struct srp_cmd *cmd = &req_iu(req)->srp.cmd; req->cdb_offset = cmd->add_cdb_len & ~3; if (req->writing) { req->dma_fmt = cmd->buf_fmt >> 4; } else { req->cdb_offset += data_out_desc_size(cmd); req->dma_fmt = cmd->buf_fmt & ((1U << 4) - 1); } switch (req->dma_fmt) { case SRP_NO_DATA_DESC: break; case SRP_DATA_DESC_DIRECT: req->total_desc = req->local_desc = 1; break; case SRP_DATA_DESC_INDIRECT: { struct srp_indirect_buf *ind_tmp = (struct srp_indirect_buf *) (cmd->add_data + req->cdb_offset); req->total_desc = be32_to_cpu(ind_tmp->table_desc.len) / sizeof(struct srp_direct_buf); req->local_desc = req->writing ? cmd->data_out_desc_cnt : cmd->data_in_desc_cnt; break; } default: fprintf(stderr, "vscsi_preprocess_desc: Unknown format %x\n", req->dma_fmt); return -1; } return 0; } /* Callback to indicate that the SCSI layer has completed a transfer. */ static void vscsi_transfer_data(SCSIRequest *sreq, uint32_t len) { VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(sreq->bus->qbus.parent); vscsi_req *req = sreq->hba_private; uint8_t *buf; int rc = 0; trace_spapr_vscsi_transfer_data(sreq->tag, len, req); if (req == NULL) { fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag); return; } if (len) { buf = scsi_req_get_buf(sreq); rc = vscsi_srp_transfer_data(s, req, req->writing, buf, len); } if (rc < 0) { fprintf(stderr, "VSCSI: RDMA error rc=%d!\n", rc); req->dma_error = true; scsi_req_cancel(req->sreq); return; } /* Start next chunk */ req->data_len -= rc; scsi_req_continue(sreq); } /* Callback to indicate that the SCSI layer has completed a transfer. */ static void vscsi_command_complete(SCSIRequest *sreq, size_t resid) { VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(sreq->bus->qbus.parent); vscsi_req *req = sreq->hba_private; int32_t res_in = 0, res_out = 0; trace_spapr_vscsi_command_complete(sreq->tag, sreq->status, req); if (req == NULL) { fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag); return; } if (sreq->status == CHECK_CONDITION) { req->senselen = scsi_req_get_sense(req->sreq, req->sense, sizeof(req->sense)); trace_spapr_vscsi_command_complete_sense_data1(req->senselen, req->sense[0], req->sense[1], req->sense[2], req->sense[3], req->sense[4], req->sense[5], req->sense[6], req->sense[7]); trace_spapr_vscsi_command_complete_sense_data2( req->sense[8], req->sense[9], req->sense[10], req->sense[11], req->sense[12], req->sense[13], req->sense[14], req->sense[15]); } trace_spapr_vscsi_command_complete_status(sreq->status); if (sreq->status == 0) { /* We handle overflows, not underflows for normal commands, * but hopefully nobody cares */ if (req->writing) { res_out = req->data_len; } else { res_in = req->data_len; } } vscsi_send_rsp(s, req, sreq->status, res_in, res_out); vscsi_put_req(req); } static void vscsi_request_cancelled(SCSIRequest *sreq) { vscsi_req *req = sreq->hba_private; if (req->dma_error) { VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(sreq->bus->qbus.parent); vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0); vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); } vscsi_put_req(req); } static const VMStateDescription vmstate_spapr_vscsi_req = { .name = "spapr_vscsi_req", .version_id = 1, .minimum_version_id = 1, .fields = (const VMStateField[]) { VMSTATE_BUFFER(crq.raw, vscsi_req), VMSTATE_BUFFER(viosrp_iu_buf, vscsi_req), VMSTATE_UINT32(qtag, vscsi_req), VMSTATE_BOOL(active, vscsi_req), VMSTATE_UINT32(data_len, vscsi_req), VMSTATE_BOOL(writing, vscsi_req), VMSTATE_UINT32(senselen, vscsi_req), VMSTATE_BUFFER(sense, vscsi_req), VMSTATE_UINT8(dma_fmt, vscsi_req), VMSTATE_UINT16(local_desc, vscsi_req), VMSTATE_UINT16(total_desc, vscsi_req), VMSTATE_UINT16(cdb_offset, vscsi_req), /*Restart SCSI request from the beginning for now */ /*VMSTATE_UINT16(cur_desc_num, vscsi_req), VMSTATE_UINT16(cur_desc_offset, vscsi_req),*/ VMSTATE_END_OF_LIST() }, }; static void vscsi_save_request(QEMUFile *f, SCSIRequest *sreq) { vscsi_req *req = sreq->hba_private; assert(req->active); vmstate_save_state(f, &vmstate_spapr_vscsi_req, req, NULL); trace_spapr_vscsi_save_request(req->qtag, req->cur_desc_num, req->cur_desc_offset); } static void *vscsi_load_request(QEMUFile *f, SCSIRequest *sreq) { SCSIBus *bus = sreq->bus; VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(bus->qbus.parent); vscsi_req *req; int rc; assert(sreq->tag < VSCSI_REQ_LIMIT); req = &s->reqs[sreq->tag]; assert(!req->active); memset(req, 0, sizeof(*req)); rc = vmstate_load_state(f, &vmstate_spapr_vscsi_req, req, 1); if (rc) { fprintf(stderr, "VSCSI: failed loading request tag#%u\n", sreq->tag); return NULL; } assert(req->active); req->sreq = scsi_req_ref(sreq); trace_spapr_vscsi_load_request(req->qtag, req->cur_desc_num, req->cur_desc_offset); return req; } static void vscsi_process_login(VSCSIState *s, vscsi_req *req) { union viosrp_iu *iu = req_iu(req); struct srp_login_rsp *rsp = &iu->srp.login_rsp; uint64_t tag = iu->srp.rsp.tag; trace_spapr_vscsi_process_login(); /* TODO handle case that requested size is wrong and * buffer format is wrong */ memset(iu, 0, sizeof(struct srp_login_rsp)); rsp->opcode = SRP_LOGIN_RSP; /* Don't advertise quite as many request as we support to * keep room for management stuff etc... */ rsp->req_lim_delta = cpu_to_be32(VSCSI_REQ_LIMIT-2); rsp->tag = tag; rsp->max_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN); rsp->max_ti_iu_len = cpu_to_be32(SRP_MAX_IU_LEN); /* direct and indirect */ rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT); vscsi_send_iu(s, req, sizeof(*rsp), VIOSRP_SRP_FORMAT); } static void vscsi_inquiry_no_target(VSCSIState *s, vscsi_req *req) { uint8_t *cdb = req_iu(req)->srp.cmd.cdb; uint8_t resp_data[36]; int rc, len, alen; /* We don't do EVPD. Also check that page_code is 0 */ if ((cdb[1] & 0x01) || cdb[2] != 0) { /* Send INVALID FIELD IN CDB */ vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0); vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); return; } alen = cdb[3]; alen = (alen << 8) | cdb[4]; len = MIN(alen, 36); /* Fake up inquiry using PQ=3 */ memset(resp_data, 0, 36); resp_data[0] = 0x7f; /* Not capable of supporting a device here */ resp_data[2] = 0x06; /* SPS-4 */ resp_data[3] = 0x02; /* Resp data format */ resp_data[4] = 36 - 5; /* Additional length */ resp_data[7] = 0x10; /* Sync transfers */ memcpy(&resp_data[16], "QEMU EMPTY ", 16); memcpy(&resp_data[8], "QEMU ", 8); req->writing = 0; vscsi_preprocess_desc(req); rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len); if (rc < 0) { vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0); vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); } else { vscsi_send_rsp(s, req, 0, 36 - rc, 0); } } static void vscsi_report_luns(VSCSIState *s, vscsi_req *req) { BusChild *kid; int i, len, n, rc; uint8_t *resp_data; bool found_lun0; n = 0; found_lun0 = false; QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) { SCSIDevice *dev = SCSI_DEVICE(kid->child); n += 8; if (dev->channel == 0 && dev->id == 0 && dev->lun == 0) { found_lun0 = true; } } if (!found_lun0) { n += 8; } len = n+8; resp_data = g_malloc0(len); stl_be_p(resp_data, n); i = found_lun0 ? 8 : 16; QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) { DeviceState *qdev = kid->child; SCSIDevice *dev = SCSI_DEVICE(qdev); if (dev->id == 0 && dev->channel == 0) { resp_data[i] = 0; /* Use simple LUN for 0 (SAM5 4.7.7.1) */ } else { resp_data[i] = (2 << 6); /* Otherwise LUN addressing (4.7.7.4) */ } resp_data[i] |= dev->id; resp_data[i+1] = (dev->channel << 5); resp_data[i+1] |= dev->lun; i += 8; } vscsi_preprocess_desc(req); rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len); g_free(resp_data); if (rc < 0) { vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0); vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); } else { vscsi_send_rsp(s, req, 0, len - rc, 0); } } static int vscsi_queue_cmd(VSCSIState *s, vscsi_req *req) { union srp_iu *srp = &req_iu(req)->srp; SCSIDevice *sdev; int n, lun; size_t cdb_len = sizeof (srp->cmd.cdb) + (srp->cmd.add_cdb_len & ~3); if ((srp->cmd.lun == 0 || be64_to_cpu(srp->cmd.lun) == SRP_REPORT_LUNS_WLUN) && srp->cmd.cdb[0] == REPORT_LUNS) { vscsi_report_luns(s, req); return 0; } sdev = vscsi_device_find(&s->bus, be64_to_cpu(srp->cmd.lun), &lun); if (!sdev) { trace_spapr_vscsi_queue_cmd_no_drive(be64_to_cpu(srp->cmd.lun)); if (srp->cmd.cdb[0] == INQUIRY) { vscsi_inquiry_no_target(s, req); } else { vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0x00); vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); } return 1; } req->sreq = scsi_req_new(sdev, req->qtag, lun, srp->cmd.cdb, cdb_len, req); n = scsi_req_enqueue(req->sreq); trace_spapr_vscsi_queue_cmd(req->qtag, srp->cmd.cdb[0], scsi_command_name(srp->cmd.cdb[0]), lun, n); if (n) { /* Transfer direction must be set before preprocessing the * descriptors */ req->writing = (n < 1); /* Preprocess RDMA descriptors */ vscsi_preprocess_desc(req); /* Get transfer direction and initiate transfer */ if (n > 0) { req->data_len = n; } else if (n < 0) { req->data_len = -n; } scsi_req_continue(req->sreq); } /* Don't touch req here, it may have been recycled already */ return 0; } static int vscsi_process_tsk_mgmt(VSCSIState *s, vscsi_req *req) { union viosrp_iu *iu = req_iu(req); vscsi_req *tmpreq; int i, lun = 0, resp = SRP_TSK_MGMT_COMPLETE; SCSIDevice *d; uint64_t tag = iu->srp.rsp.tag; uint8_t sol_not = iu->srp.cmd.sol_not; trace_spapr_vscsi_process_tsk_mgmt(iu->srp.tsk_mgmt.tsk_mgmt_func); d = vscsi_device_find(&s->bus, be64_to_cpu(req_iu(req)->srp.tsk_mgmt.lun), &lun); if (!d) { resp = SRP_TSK_MGMT_FIELDS_INVALID; } else { switch (iu->srp.tsk_mgmt.tsk_mgmt_func) { case SRP_TSK_ABORT_TASK: if (d->lun != lun) { resp = SRP_TSK_MGMT_FIELDS_INVALID; break; } tmpreq = vscsi_find_req(s, req_iu(req)->srp.tsk_mgmt.task_tag); if (tmpreq && tmpreq->sreq) { assert(tmpreq->sreq->hba_private); scsi_req_cancel(tmpreq->sreq); } break; case SRP_TSK_LUN_RESET: if (d->lun != lun) { resp = SRP_TSK_MGMT_FIELDS_INVALID; break; } device_cold_reset(&d->qdev); break; case SRP_TSK_ABORT_TASK_SET: case SRP_TSK_CLEAR_TASK_SET: if (d->lun != lun) { resp = SRP_TSK_MGMT_FIELDS_INVALID; break; } for (i = 0; i < VSCSI_REQ_LIMIT; i++) { tmpreq = &s->reqs[i]; if (req_iu(tmpreq)->srp.cmd.lun != req_iu(req)->srp.tsk_mgmt.lun) { continue; } if (!tmpreq->active || !tmpreq->sreq) { continue; } assert(tmpreq->sreq->hba_private); scsi_req_cancel(tmpreq->sreq); } break; case SRP_TSK_CLEAR_ACA: resp = SRP_TSK_MGMT_NOT_SUPPORTED; break; default: resp = SRP_TSK_MGMT_FIELDS_INVALID; break; } } /* Compose the response here as */ QEMU_BUILD_BUG_ON(SRP_MAX_IU_DATA_LEN < 4); memset(iu, 0, sizeof(struct srp_rsp) + 4); iu->srp.rsp.opcode = SRP_RSP; iu->srp.rsp.req_lim_delta = cpu_to_be32(1); iu->srp.rsp.tag = tag; iu->srp.rsp.flags |= SRP_RSP_FLAG_RSPVALID; iu->srp.rsp.resp_data_len = cpu_to_be32(4); if (resp) { iu->srp.rsp.sol_not = (sol_not & 0x04) >> 2; } else { iu->srp.rsp.sol_not = (sol_not & 0x02) >> 1; } iu->srp.rsp.status = GOOD; iu->srp.rsp.data[3] = resp; vscsi_send_iu(s, req, sizeof(iu->srp.rsp) + 4, VIOSRP_SRP_FORMAT); return 1; } static int vscsi_handle_srp_req(VSCSIState *s, vscsi_req *req) { union srp_iu *srp = &req_iu(req)->srp; int done = 1; uint8_t opcode = srp->rsp.opcode; switch (opcode) { case SRP_LOGIN_REQ: vscsi_process_login(s, req); break; case SRP_TSK_MGMT: done = vscsi_process_tsk_mgmt(s, req); break; case SRP_CMD: done = vscsi_queue_cmd(s, req); break; case SRP_LOGIN_RSP: case SRP_I_LOGOUT: case SRP_T_LOGOUT: case SRP_RSP: case SRP_CRED_REQ: case SRP_CRED_RSP: case SRP_AER_REQ: case SRP_AER_RSP: fprintf(stderr, "VSCSI: Unsupported opcode %02x\n", opcode); break; default: fprintf(stderr, "VSCSI: Unknown type %02x\n", opcode); } return done; } static int vscsi_send_adapter_info(VSCSIState *s, vscsi_req *req) { struct viosrp_adapter_info *sinfo; struct mad_adapter_info_data info; int rc; sinfo = &req_iu(req)->mad.adapter_info; #if 0 /* What for ? */ rc = spapr_vio_dma_read(&s->vdev, be64_to_cpu(sinfo->buffer), &info, be16_to_cpu(sinfo->common.length)); if (rc) { fprintf(stderr, "vscsi_send_adapter_info: DMA read failure !\n"); } #endif memset(&info, 0, sizeof(info)); strcpy(info.srp_version, SRP_VERSION); memcpy(info.partition_name, "qemu", sizeof("qemu")); info.partition_number = cpu_to_be32(0); info.mad_version = cpu_to_be32(1); info.os_type = cpu_to_be32(2); info.port_max_txu[0] = cpu_to_be32(VSCSI_MAX_SECTORS << 9); rc = spapr_vio_dma_write(&s->vdev, be64_to_cpu(sinfo->buffer), &info, be16_to_cpu(sinfo->common.length)); if (rc) { fprintf(stderr, "vscsi_send_adapter_info: DMA write failure !\n"); } sinfo->common.status = rc ? cpu_to_be32(1) : 0; return vscsi_send_iu(s, req, sizeof(*sinfo), VIOSRP_MAD_FORMAT); } static int vscsi_send_capabilities(VSCSIState *s, vscsi_req *req) { struct viosrp_capabilities *vcap; struct capabilities cap = { }; uint16_t len, req_len; uint64_t buffer; int rc; vcap = &req_iu(req)->mad.capabilities; req_len = len = be16_to_cpu(vcap->common.length); buffer = be64_to_cpu(vcap->buffer); if (len > sizeof(cap)) { fprintf(stderr, "vscsi_send_capabilities: capabilities size mismatch !\n"); /* * Just read and populate the structure that is known. * Zero rest of the structure. */ len = sizeof(cap); } rc = spapr_vio_dma_read(&s->vdev, buffer, &cap, len); if (rc) { fprintf(stderr, "vscsi_send_capabilities: DMA read failure !\n"); } /* * Current implementation does not support any migration or * reservation capabilities. Construct the response telling the * guest not to use them. */ cap.flags = 0; cap.migration.ecl = 0; cap.reserve.type = 0; cap.migration.common.server_support = 0; cap.reserve.common.server_support = 0; rc = spapr_vio_dma_write(&s->vdev, buffer, &cap, len); if (rc) { fprintf(stderr, "vscsi_send_capabilities: DMA write failure !\n"); } if (req_len > len) { /* * Being paranoid and lets not worry about the error code * here. Actual write of the cap is done above. */ spapr_vio_dma_set(&s->vdev, (buffer + len), 0, (req_len - len)); } vcap->common.status = rc ? cpu_to_be32(1) : 0; return vscsi_send_iu(s, req, sizeof(*vcap), VIOSRP_MAD_FORMAT); } static int vscsi_handle_mad_req(VSCSIState *s, vscsi_req *req) { union mad_iu *mad = &req_iu(req)->mad; bool request_handled = false; uint64_t retlen = 0; switch (be32_to_cpu(mad->empty_iu.common.type)) { case VIOSRP_EMPTY_IU_TYPE: fprintf(stderr, "Unsupported EMPTY MAD IU\n"); retlen = sizeof(mad->empty_iu); break; case VIOSRP_ERROR_LOG_TYPE: fprintf(stderr, "Unsupported ERROR LOG MAD IU\n"); retlen = sizeof(mad->error_log); break; case VIOSRP_ADAPTER_INFO_TYPE: vscsi_send_adapter_info(s, req); request_handled = true; break; case VIOSRP_HOST_CONFIG_TYPE: retlen = sizeof(mad->host_config); break; case VIOSRP_CAPABILITIES_TYPE: vscsi_send_capabilities(s, req); request_handled = true; break; default: fprintf(stderr, "VSCSI: Unknown MAD type %02x\n", be32_to_cpu(mad->empty_iu.common.type)); /* * PAPR+ says that "The length field is set to the length * of the data structure(s) used in the command". * As we did not recognize the request type, put zero there. */ retlen = 0; } if (!request_handled) { mad->empty_iu.common.status = cpu_to_be16(VIOSRP_MAD_NOT_SUPPORTED); vscsi_send_iu(s, req, retlen, VIOSRP_MAD_FORMAT); } return 1; } static void vscsi_got_payload(VSCSIState *s, vscsi_crq *crq) { vscsi_req *req; int done; req = vscsi_get_req(s); if (req == NULL) { fprintf(stderr, "VSCSI: Failed to get a request !\n"); return; } /* We only support a limited number of descriptors, we know * the ibmvscsi driver uses up to 10 max, so it should fit * in our 256 bytes IUs. If not we'll have to increase the size * of the structure. */ if (crq->s.IU_length > SRP_MAX_IU_LEN) { fprintf(stderr, "VSCSI: SRP IU too long (%d bytes) !\n", crq->s.IU_length); vscsi_put_req(req); return; } /* XXX Handle failure differently ? */ if (spapr_vio_dma_read(&s->vdev, crq->s.IU_data_ptr, &req->viosrp_iu_buf, crq->s.IU_length)) { fprintf(stderr, "vscsi_got_payload: DMA read failure !\n"); vscsi_put_req(req); return; } memcpy(&req->crq, crq, sizeof(vscsi_crq)); if (crq->s.format == VIOSRP_MAD_FORMAT) { done = vscsi_handle_mad_req(s, req); } else { done = vscsi_handle_srp_req(s, req); } if (done) { vscsi_put_req(req); } } static int vscsi_do_crq(struct SpaprVioDevice *dev, uint8_t *crq_data) { VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(dev); vscsi_crq crq; memcpy(crq.raw, crq_data, 16); crq.s.timeout = be16_to_cpu(crq.s.timeout); crq.s.IU_length = be16_to_cpu(crq.s.IU_length); crq.s.IU_data_ptr = be64_to_cpu(crq.s.IU_data_ptr); trace_spapr_vscsi_do_crq(crq.raw[0], crq.raw[1]); switch (crq.s.valid) { case 0xc0: /* Init command/response */ /* Respond to initialization request */ if (crq.s.format == 0x01) { memset(crq.raw, 0, 16); crq.s.valid = 0xc0; crq.s.format = 0x02; spapr_vio_send_crq(dev, crq.raw); } /* Note that in hotplug cases, we might get a 0x02 * as a result of us emitting the init request */ break; case 0xff: /* Link event */ /* Not handled for now */ break; case 0x80: /* Payloads */ switch (crq.s.format) { case VIOSRP_SRP_FORMAT: /* AKA VSCSI request */ case VIOSRP_MAD_FORMAT: /* AKA VSCSI response */ vscsi_got_payload(s, &crq); break; case VIOSRP_OS400_FORMAT: case VIOSRP_AIX_FORMAT: case VIOSRP_LINUX_FORMAT: case VIOSRP_INLINE_FORMAT: fprintf(stderr, "vscsi_do_srq: Unsupported payload format %02x\n", crq.s.format); break; default: fprintf(stderr, "vscsi_do_srq: Unknown payload format %02x\n", crq.s.format); } break; default: fprintf(stderr, "vscsi_do_crq: unknown CRQ %02x %02x ...\n", crq.raw[0], crq.raw[1]); }; return 0; } static const struct SCSIBusInfo vscsi_scsi_info = { .tcq = true, .max_channel = 7, /* logical unit addressing format */ .max_target = 63, .max_lun = 31, .transfer_data = vscsi_transfer_data, .complete = vscsi_command_complete, .cancel = vscsi_request_cancelled, .save_request = vscsi_save_request, .load_request = vscsi_load_request, }; static void spapr_vscsi_reset(SpaprVioDevice *dev) { VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(dev); int i; memset(s->reqs, 0, sizeof(s->reqs)); for (i = 0; i < VSCSI_REQ_LIMIT; i++) { s->reqs[i].qtag = i; } } static void spapr_vscsi_realize(SpaprVioDevice *dev, Error **errp) { VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(dev); dev->crq.SendFunc = vscsi_do_crq; scsi_bus_init(&s->bus, sizeof(s->bus), DEVICE(dev), &vscsi_scsi_info); /* ibmvscsi SCSI bus does not allow hotplug. */ qbus_set_hotplug_handler(BUS(&s->bus), NULL); } void spapr_vscsi_create(SpaprVioBus *bus) { DeviceState *dev; dev = qdev_new("spapr-vscsi"); qdev_realize_and_unref(dev, &bus->bus, &error_fatal); scsi_bus_legacy_handle_cmdline(&VIO_SPAPR_VSCSI_DEVICE(dev)->bus); } static int spapr_vscsi_devnode(SpaprVioDevice *dev, void *fdt, int node_off) { int ret; ret = fdt_setprop_cell(fdt, node_off, "#address-cells", 2); if (ret < 0) { return ret; } ret = fdt_setprop_cell(fdt, node_off, "#size-cells", 0); if (ret < 0) { return ret; } return 0; } static Property spapr_vscsi_properties[] = { DEFINE_SPAPR_PROPERTIES(VSCSIState, vdev), DEFINE_PROP_END_OF_LIST(), }; static const VMStateDescription vmstate_spapr_vscsi = { .name = "spapr_vscsi", .version_id = 1, .minimum_version_id = 1, .fields = (const VMStateField[]) { VMSTATE_SPAPR_VIO(vdev, VSCSIState), /* VSCSI state */ /* ???? */ VMSTATE_END_OF_LIST() }, }; static void spapr_vscsi_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); SpaprVioDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass); k->realize = spapr_vscsi_realize; k->reset = spapr_vscsi_reset; k->devnode = spapr_vscsi_devnode; k->dt_name = "v-scsi"; k->dt_type = "vscsi"; k->dt_compatible = "IBM,v-scsi"; k->signal_mask = 0x00000001; set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); device_class_set_props(dc, spapr_vscsi_properties); k->rtce_window_size = 0x10000000; dc->vmsd = &vmstate_spapr_vscsi; } static const TypeInfo spapr_vscsi_info = { .name = TYPE_VIO_SPAPR_VSCSI_DEVICE, .parent = TYPE_VIO_SPAPR_DEVICE, .instance_size = sizeof(VSCSIState), .class_init = spapr_vscsi_class_init, }; static void spapr_vscsi_register_types(void) { type_register_static(&spapr_vscsi_info); } type_init(spapr_vscsi_register_types)