| /* |
| * 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 "hw.h" |
| #include "scsi.h" |
| #include "scsi-defs.h" |
| #include "net.h" /* Remove that when we can */ |
| #include "srp.h" |
| #include "hw/qdev.h" |
| #include "hw/spapr.h" |
| #include "hw/spapr_vio.h" |
| #include "hw/ppc-viosrp.h" |
| |
| #include <libfdt.h> |
| |
| /*#define DEBUG_VSCSI*/ |
| |
| #ifdef DEBUG_VSCSI |
| #define dprintf(fmt, ...) \ |
| do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) |
| #else |
| #define dprintf(fmt, ...) \ |
| do { } while (0) |
| #endif |
| |
| /* |
| * Virtual SCSI device |
| */ |
| |
| /* Random numbers */ |
| #define VSCSI_MAX_SECTORS 4096 |
| #define VSCSI_REQ_LIMIT 24 |
| |
| #define SCSI_SENSE_BUF_SIZE 96 |
| #define SRP_RSP_SENSE_DATA_LEN 18 |
| |
| typedef union vscsi_crq { |
| struct viosrp_crq s; |
| uint8_t raw[16]; |
| } vscsi_crq; |
| |
| typedef struct vscsi_req { |
| vscsi_crq crq; |
| union viosrp_iu iu; |
| |
| /* SCSI request tracking */ |
| SCSIRequest *sreq; |
| uint32_t qtag; /* qemu tag != srp tag */ |
| int lun; |
| int active; |
| long data_len; |
| int writing; |
| int sensing; |
| int senselen; |
| uint8_t sense[SCSI_SENSE_BUF_SIZE]; |
| |
| /* RDMA related bits */ |
| uint8_t dma_fmt; |
| struct srp_direct_buf ext_desc; |
| struct srp_direct_buf *cur_desc; |
| struct srp_indirect_buf *ind_desc; |
| int local_desc; |
| int total_desc; |
| } vscsi_req; |
| |
| |
| typedef struct { |
| VIOsPAPRDevice vdev; |
| SCSIBus bus; |
| vscsi_req reqs[VSCSI_REQ_LIMIT]; |
| } VSCSIState; |
| |
| /* XXX Debug only */ |
| static VSCSIState *dbg_vscsi_state; |
| |
| |
| 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 void vscsi_put_req(VSCSIState *s, vscsi_req *req) |
| { |
| if (req->sreq != NULL) { |
| scsi_req_unref(req->sreq); |
| } |
| req->sreq = NULL; |
| req->active = 0; |
| } |
| |
| static vscsi_req *vscsi_find_req(VSCSIState *s, SCSIRequest *req) |
| { |
| uint32_t tag = req->tag; |
| if (tag >= VSCSI_REQ_LIMIT || !s->reqs[tag].active) { |
| return NULL; |
| } |
| return &s->reqs[tag]; |
| } |
| |
| static void vscsi_decode_id_lun(uint64_t srp_lun, int *id, int *lun) |
| { |
| /* XXX Figure that one out properly ! This is crackpot */ |
| *id = (srp_lun >> 56) & 0x7f; |
| *lun = (srp_lun >> 48) & 0xff; |
| } |
| |
| static int vscsi_send_iu(VSCSIState *s, vscsi_req *req, |
| uint64_t length, uint8_t format) |
| { |
| long rc, rc1; |
| |
| /* First copy the SRP */ |
| rc = spapr_tce_dma_write(&s->vdev, req->crq.s.IU_data_ptr, |
| &req->iu, 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.srp.rsp.tag; /* right byte order */ |
| |
| if (rc == 0) { |
| req->crq.s.status = 0x99; /* Just needs to be non-zero */ |
| } else { |
| req->crq.s.status = 0x00; |
| } |
| |
| 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; |
| uint64_t tag = iu->srp.rsp.tag; |
| int total_len = sizeof(iu->srp.rsp); |
| |
| dprintf("VSCSI: Sending resp status: 0x%x, " |
| "res_in: %d, res_out: %d\n", 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 = (iu->srp.cmd.sol_not & 0x04) >> 2; |
| if (req->senselen) { |
| req->iu.srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID; |
| req->iu.srp.rsp.sense_data_len = cpu_to_be32(req->senselen); |
| memcpy(req->iu.srp.rsp.data, req->sense, req->senselen); |
| total_len += req->senselen; |
| } |
| } else { |
| iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x02) >> 1; |
| } |
| |
| vscsi_send_iu(s, req, total_len, VIOSRP_SRP_FORMAT); |
| return 0; |
| } |
| |
| static inline void vscsi_swap_desc(struct srp_direct_buf *desc) |
| { |
| desc->va = be64_to_cpu(desc->va); |
| desc->len = be32_to_cpu(desc->len); |
| } |
| |
| static int vscsi_srp_direct_data(VSCSIState *s, vscsi_req *req, |
| uint8_t *buf, uint32_t len) |
| { |
| struct srp_direct_buf *md = req->cur_desc; |
| uint32_t llen; |
| int rc = 0; |
| |
| dprintf("VSCSI: direct segment 0x%x bytes, va=0x%llx desc len=0x%x\n", |
| len, (unsigned long long)md->va, md->len); |
| |
| llen = MIN(len, md->len); |
| if (llen) { |
| if (req->writing) { /* writing = to device = reading from memory */ |
| rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen); |
| } else { |
| rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen); |
| } |
| } |
| md->len -= llen; |
| md->va += llen; |
| |
| if (rc) { |
| return -1; |
| } |
| return llen; |
| } |
| |
| static int vscsi_srp_indirect_data(VSCSIState *s, vscsi_req *req, |
| uint8_t *buf, uint32_t len) |
| { |
| struct srp_direct_buf *td = &req->ind_desc->table_desc; |
| struct srp_direct_buf *md = req->cur_desc; |
| int rc = 0; |
| uint32_t llen, total = 0; |
| |
| dprintf("VSCSI: indirect segment 0x%x bytes, td va=0x%llx len=0x%x\n", |
| len, (unsigned long long)td->va, td->len); |
| |
| /* While we have data ... */ |
| while (len) { |
| /* If we have a descriptor but it's empty, go fetch a new one */ |
| if (md && md->len == 0) { |
| /* More local available, use one */ |
| if (req->local_desc) { |
| md = ++req->cur_desc; |
| --req->local_desc; |
| --req->total_desc; |
| td->va += sizeof(struct srp_direct_buf); |
| } else { |
| md = req->cur_desc = NULL; |
| } |
| } |
| /* No descriptor at hand, fetch one */ |
| if (!md) { |
| if (!req->total_desc) { |
| dprintf("VSCSI: Out of descriptors !\n"); |
| break; |
| } |
| md = req->cur_desc = &req->ext_desc; |
| dprintf("VSCSI: Reading desc from 0x%llx\n", |
| (unsigned long long)td->va); |
| rc = spapr_tce_dma_read(&s->vdev, td->va, md, |
| sizeof(struct srp_direct_buf)); |
| if (rc) { |
| dprintf("VSCSI: tce_dma_read -> %d reading ext_desc\n", rc); |
| break; |
| } |
| vscsi_swap_desc(md); |
| td->va += sizeof(struct srp_direct_buf); |
| --req->total_desc; |
| } |
| dprintf("VSCSI: [desc va=0x%llx,len=0x%x] remaining=0x%x\n", |
| (unsigned long long)md->va, md->len, len); |
| |
| /* Perform transfer */ |
| llen = MIN(len, md->len); |
| if (req->writing) { /* writing = to device = reading from memory */ |
| rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen); |
| } else { |
| rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen); |
| } |
| if (rc) { |
| dprintf("VSCSI: tce_dma_r/w(%d) -> %d\n", req->writing, rc); |
| break; |
| } |
| dprintf("VSCSI: data: %02x %02x %02x %02x...\n", |
| buf[0], buf[1], buf[2], buf[3]); |
| |
| len -= llen; |
| buf += llen; |
| total += llen; |
| md->va += llen; |
| md->len -= llen; |
| } |
| 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: |
| dprintf("VSCSI: no data desc transfer, skipping 0x%x bytes\n", 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.srp.cmd; |
| int offset, i; |
| |
| offset = cmd->add_cdb_len & ~3; |
| |
| if (req->writing) { |
| req->dma_fmt = cmd->buf_fmt >> 4; |
| } else { |
| 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->cur_desc = (struct srp_direct_buf *)(cmd->add_data + offset); |
| req->total_desc = req->local_desc = 1; |
| vscsi_swap_desc(req->cur_desc); |
| dprintf("VSCSI: using direct RDMA %s, 0x%x bytes MD: 0x%llx\n", |
| req->writing ? "write" : "read", |
| req->cur_desc->len, (unsigned long long)req->cur_desc->va); |
| break; |
| case SRP_DATA_DESC_INDIRECT: |
| req->ind_desc = (struct srp_indirect_buf *)(cmd->add_data + offset); |
| vscsi_swap_desc(&req->ind_desc->table_desc); |
| req->total_desc = req->ind_desc->table_desc.len / |
| sizeof(struct srp_direct_buf); |
| req->local_desc = req->writing ? cmd->data_out_desc_cnt : |
| cmd->data_in_desc_cnt; |
| for (i = 0; i < req->local_desc; i++) { |
| vscsi_swap_desc(&req->ind_desc->desc_list[i]); |
| } |
| req->cur_desc = req->local_desc ? &req->ind_desc->desc_list[0] : NULL; |
| dprintf("VSCSI: using indirect RDMA %s, 0x%x bytes %d descs " |
| "(%d local) VA: 0x%llx\n", |
| req->writing ? "read" : "write", |
| be32_to_cpu(req->ind_desc->len), |
| req->total_desc, req->local_desc, |
| (unsigned long long)req->ind_desc->table_desc.va); |
| break; |
| default: |
| fprintf(stderr, |
| "vscsi_preprocess_desc: Unknown format %x\n", req->dma_fmt); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static void vscsi_send_request_sense(VSCSIState *s, vscsi_req *req) |
| { |
| uint8_t *cdb = req->iu.srp.cmd.cdb; |
| int n; |
| |
| n = scsi_req_get_sense(req->sreq, req->sense, sizeof(req->sense)); |
| if (n) { |
| req->senselen = n; |
| vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); |
| vscsi_put_req(s, req); |
| return; |
| } |
| |
| dprintf("VSCSI: Got CHECK_CONDITION, requesting sense...\n"); |
| cdb[0] = 3; |
| cdb[1] = 0; |
| cdb[2] = 0; |
| cdb[3] = 0; |
| cdb[4] = 96; |
| cdb[5] = 0; |
| req->sensing = 1; |
| n = scsi_req_enqueue(req->sreq, cdb); |
| dprintf("VSCSI: Queued request sense tag 0x%x\n", req->qtag); |
| if (n < 0) { |
| fprintf(stderr, "VSCSI: REQUEST_SENSE wants write data !?!?!?\n"); |
| vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0); |
| scsi_req_abort(req->sreq, CHECK_CONDITION); |
| return; |
| } else if (n == 0) { |
| return; |
| } |
| scsi_req_continue(req->sreq); |
| } |
| |
| /* Callback to indicate that the SCSI layer has completed a transfer. */ |
| static void vscsi_transfer_data(SCSIRequest *sreq, uint32_t len) |
| { |
| VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent); |
| vscsi_req *req = vscsi_find_req(s, sreq); |
| uint8_t *buf; |
| int rc = 0; |
| |
| dprintf("VSCSI: SCSI xfer complete tag=0x%x len=0x%x, req=%p\n", |
| sreq->tag, len, req); |
| if (req == NULL) { |
| fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag); |
| return; |
| } |
| |
| if (req->sensing) { |
| uint8_t *buf = scsi_req_get_buf(sreq); |
| |
| len = MIN(len, SCSI_SENSE_BUF_SIZE); |
| dprintf("VSCSI: Sense data, %d bytes:\n", len); |
| dprintf(" %02x %02x %02x %02x %02x %02x %02x %02x\n", |
| buf[0], buf[1], buf[2], buf[3], |
| buf[4], buf[5], buf[6], buf[7]); |
| dprintf(" %02x %02x %02x %02x %02x %02x %02x %02x\n", |
| buf[8], buf[9], buf[10], buf[11], |
| buf[12], buf[13], buf[14], buf[15]); |
| memcpy(req->sense, buf, len); |
| req->senselen = len; |
| scsi_req_continue(req->sreq); |
| 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); |
| vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0); |
| scsi_req_abort(req->sreq, CHECK_CONDITION); |
| 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, uint32_t status) |
| { |
| VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent); |
| vscsi_req *req = vscsi_find_req(s, sreq); |
| int32_t res_in = 0, res_out = 0; |
| |
| dprintf("VSCSI: SCSI cmd complete, r=0x%x tag=0x%x status=0x%x, req=%p\n", |
| reason, sreq->tag, status, req); |
| if (req == NULL) { |
| fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag); |
| return; |
| } |
| |
| if (!req->sensing && status == CHECK_CONDITION) { |
| vscsi_send_request_sense(s, req); |
| return; |
| } |
| |
| if (req->sensing) { |
| dprintf("VSCSI: Sense done !\n"); |
| status = CHECK_CONDITION; |
| } else { |
| dprintf("VSCSI: Command complete err=%d\n", status); |
| if (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, 0, res_in, res_out); |
| vscsi_put_req(s, req); |
| } |
| |
| static void vscsi_request_cancelled(SCSIRequest *sreq) |
| { |
| VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent); |
| vscsi_req *req = vscsi_find_req(s, sreq); |
| |
| vscsi_put_req(s, req); |
| } |
| |
| static void vscsi_process_login(VSCSIState *s, vscsi_req *req) |
| { |
| union viosrp_iu *iu = &req->iu; |
| struct srp_login_rsp *rsp = &iu->srp.login_rsp; |
| uint64_t tag = iu->srp.rsp.tag; |
| |
| dprintf("VSCSI: Got login, sendin response !\n"); |
| |
| /* 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(sizeof(union srp_iu)); |
| rsp->max_ti_iu_len = cpu_to_be32(sizeof(union srp_iu)); |
| /* 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.srp.cmd.cdb; |
| uint8_t resp_data[36]; |
| int rc, len, alen; |
| |
| /* We dont do EVPD. Also check that page_code is 0 */ |
| if ((cdb[1] & 0x01) || (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 int vscsi_queue_cmd(VSCSIState *s, vscsi_req *req) |
| { |
| union srp_iu *srp = &req->iu.srp; |
| SCSIDevice *sdev; |
| int n, id, lun; |
| |
| vscsi_decode_id_lun(be64_to_cpu(srp->cmd.lun), &id, &lun); |
| |
| /* Qemu vs. linux issue with LUNs to be sorted out ... */ |
| sdev = (id < 8 && lun < 16) ? s->bus.devs[id] : NULL; |
| if (!sdev) { |
| dprintf("VSCSI: Command for id %d with no drive\n", id); |
| 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->lun = lun; |
| req->sreq = scsi_req_new(sdev, req->qtag, lun); |
| n = scsi_req_enqueue(req->sreq, srp->cmd.cdb); |
| |
| dprintf("VSCSI: Queued command tag 0x%x CMD 0x%x ID %d LUN %d ret: %d\n", |
| req->qtag, srp->cmd.cdb[0], id, 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; |
| int fn; |
| |
| fprintf(stderr, "vscsi_process_tsk_mgmt %02x\n", |
| iu->srp.tsk_mgmt.tsk_mgmt_func); |
| |
| switch (iu->srp.tsk_mgmt.tsk_mgmt_func) { |
| #if 0 /* We really don't deal with these for now */ |
| case SRP_TSK_ABORT_TASK: |
| fn = ABORT_TASK; |
| break; |
| case SRP_TSK_ABORT_TASK_SET: |
| fn = ABORT_TASK_SET; |
| break; |
| case SRP_TSK_CLEAR_TASK_SET: |
| fn = CLEAR_TASK_SET; |
| break; |
| case SRP_TSK_LUN_RESET: |
| fn = LOGICAL_UNIT_RESET; |
| break; |
| case SRP_TSK_CLEAR_ACA: |
| fn = CLEAR_ACA; |
| break; |
| #endif |
| default: |
| fn = 0; |
| } |
| if (fn) { |
| /* XXX Send/Handle target task management */ |
| ; |
| } else { |
| vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x20, 0); |
| vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); |
| } |
| return !fn; |
| } |
| |
| static int vscsi_handle_srp_req(VSCSIState *s, vscsi_req *req) |
| { |
| union srp_iu *srp = &req->iu.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.mad.adapter_info; |
| |
| #if 0 /* What for ? */ |
| rc = spapr_tce_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); |
| strncpy(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_tce_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_handle_mad_req(VSCSIState *s, vscsi_req *req) |
| { |
| union mad_iu *mad = &req->iu.mad; |
| |
| switch (be32_to_cpu(mad->empty_iu.common.type)) { |
| case VIOSRP_EMPTY_IU_TYPE: |
| fprintf(stderr, "Unsupported EMPTY MAD IU\n"); |
| break; |
| case VIOSRP_ERROR_LOG_TYPE: |
| fprintf(stderr, "Unsupported ERROR LOG MAD IU\n"); |
| mad->error_log.common.status = cpu_to_be16(1); |
| vscsi_send_iu(s, req, sizeof(mad->error_log), VIOSRP_MAD_FORMAT); |
| break; |
| case VIOSRP_ADAPTER_INFO_TYPE: |
| vscsi_send_adapter_info(s, req); |
| break; |
| case VIOSRP_HOST_CONFIG_TYPE: |
| mad->host_config.common.status = cpu_to_be16(1); |
| vscsi_send_iu(s, req, sizeof(mad->host_config), VIOSRP_MAD_FORMAT); |
| break; |
| default: |
| fprintf(stderr, "VSCSI: Unknown MAD type %02x\n", |
| be32_to_cpu(mad->empty_iu.common.type)); |
| } |
| |
| 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 > sizeof(union viosrp_iu)) { |
| fprintf(stderr, "VSCSI: SRP IU too long (%d bytes) !\n", |
| crq->s.IU_length); |
| return; |
| } |
| |
| /* XXX Handle failure differently ? */ |
| if (spapr_tce_dma_read(&s->vdev, crq->s.IU_data_ptr, &req->iu, |
| crq->s.IU_length)) { |
| fprintf(stderr, "vscsi_got_payload: DMA read failure !\n"); |
| qemu_free(req); |
| } |
| 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(s, req); |
| } |
| } |
| |
| |
| static int vscsi_do_crq(struct VIOsPAPRDevice *dev, uint8_t *crq_data) |
| { |
| VSCSIState *s = DO_UPCAST(VSCSIState, vdev, 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); |
| |
| dprintf("VSCSI: do_crq %02x %02x ...\n", 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 SCSIBusOps vscsi_scsi_ops = { |
| .transfer_data = vscsi_transfer_data, |
| .complete = vscsi_command_complete, |
| .cancel = vscsi_request_cancelled |
| }; |
| |
| static int spapr_vscsi_init(VIOsPAPRDevice *dev) |
| { |
| VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev); |
| int i; |
| |
| dbg_vscsi_state = s; |
| |
| /* Initialize qemu request tags */ |
| memset(s->reqs, 0, sizeof(s->reqs)); |
| for (i = 0; i < VSCSI_REQ_LIMIT; i++) { |
| s->reqs[i].qtag = i; |
| } |
| |
| dev->crq.SendFunc = vscsi_do_crq; |
| |
| scsi_bus_new(&s->bus, &dev->qdev, 1, VSCSI_REQ_LIMIT, |
| &vscsi_scsi_ops); |
| if (!dev->qdev.hotplugged) { |
| scsi_bus_legacy_handle_cmdline(&s->bus); |
| } |
| |
| return 0; |
| } |
| |
| void spapr_vscsi_create(VIOsPAPRBus *bus, uint32_t reg, |
| qemu_irq qirq, uint32_t vio_irq_num) |
| { |
| DeviceState *dev; |
| VIOsPAPRDevice *sdev; |
| |
| dev = qdev_create(&bus->bus, "spapr-vscsi"); |
| qdev_prop_set_uint32(dev, "reg", reg); |
| |
| qdev_init_nofail(dev); |
| |
| sdev = (VIOsPAPRDevice *)dev; |
| sdev->qirq = qirq; |
| sdev->vio_irq_num = vio_irq_num; |
| } |
| |
| static int spapr_vscsi_devnode(VIOsPAPRDevice *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 VIOsPAPRDeviceInfo spapr_vscsi = { |
| .init = spapr_vscsi_init, |
| .devnode = spapr_vscsi_devnode, |
| .dt_name = "v-scsi", |
| .dt_type = "vscsi", |
| .dt_compatible = "IBM,v-scsi", |
| .signal_mask = 0x00000001, |
| .qdev.name = "spapr-vscsi", |
| .qdev.size = sizeof(VSCSIState), |
| .qdev.props = (Property[]) { |
| DEFINE_PROP_UINT32("reg", VIOsPAPRDevice, reg, 0x2000), |
| DEFINE_PROP_UINT32("dma-window", VIOsPAPRDevice, |
| rtce_window_size, 0x10000000), |
| DEFINE_PROP_END_OF_LIST(), |
| }, |
| }; |
| |
| static void spapr_vscsi_register(void) |
| { |
| spapr_vio_bus_register_withprop(&spapr_vscsi); |
| } |
| device_init(spapr_vscsi_register); |
