diff options
Diffstat (limited to 'src/hw/scsi/spapr_vscsi.c')
| -rw-r--r-- | src/hw/scsi/spapr_vscsi.c | 1301 |
1 files changed, 1301 insertions, 0 deletions
diff --git a/src/hw/scsi/spapr_vscsi.c b/src/hw/scsi/spapr_vscsi.c new file mode 100644 index 0000000..f4f5140 --- /dev/null +++ b/src/hw/scsi/spapr_vscsi.c @@ -0,0 +1,1301 @@ +/* + * 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/hw.h" +#include "hw/scsi/scsi.h" +#include "block/scsi.h" +#include "srp.h" +#include "hw/qdev.h" +#include "hw/ppc/spapr.h" +#include "hw/ppc/spapr_vio.h" +#include "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 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; + union viosrp_iu iu; + + /* 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" +#define VIO_SPAPR_VSCSI_DEVICE(obj) \ + OBJECT_CHECK(VSCSIState, (obj), TYPE_VIO_SPAPR_VSCSI_DEVICE) + +typedef struct { + VIOsPAPRDevice vdev; + SCSIBus bus; + vscsi_req reqs[VSCSI_REQ_LIMIT]; +} VSCSIState; + +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.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; + + /* First copy the SRP */ + rc = spapr_vio_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 = 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; + uint64_t tag = iu->srp.rsp.tag; + int total_len = sizeof(iu->srp.rsp); + uint8_t sol_not = iu->srp.cmd.sol_not; + + 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 = (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 = (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.srp.cmd; + + switch (req->dma_fmt) { + case SRP_NO_DATA_DESC: { + DPRINTF("VSCSI: no data descriptor\n"); + return 0; + } + case SRP_DATA_DESC_DIRECT: { + memcpy(ret, cmd->add_data + req->cdb_offset, sizeof(*ret)); + assert(req->cur_desc_num == 0); + DPRINTF("VSCSI: direct segment\n"); + 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]; + DPRINTF("VSCSI: indirect segment local tag=0x%x desc#%d/%d\n", + 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) { + DPRINTF("VSCSI: #%d is ouf of range (%d bytes)\n", + 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) { + DPRINTF("VSCSI: spapr_vio_dma_read -> %d reading ext_desc\n", + rc); + return -1; + } + DPRINTF("VSCSI: indirect segment ext. tag=0x%x desc#%d/%d { va=%"PRIx64" len=%x }\n", + req->qtag, n, req->total_desc, tbl_desc.va, tbl_desc.len); + } else { + DPRINTF("VSCSI: Out of descriptors !\n"); + 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) { + DPRINTF(" offset=%x is out of a descriptor #%d boundary=%x\n", + buf_offset, req->cur_desc_num, ret->len); + return -1; + } + ret->va += buf_offset; + ret->len -= buf_offset; + + DPRINTF(" cur=%d offs=%x ret { va=%"PRIx64" len=%x }\n", + 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; + + DPRINTF("VSCSI: indirect segment 0x%x bytes\n", 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) { + DPRINTF("VSCSI: spapr_vio_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; + + /* 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: + 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; + + 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; + + 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 (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, uint32_t status, 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; + + DPRINTF("VSCSI: SCSI cmd complete, tag=0x%x status=0x%x, req=%p\n", + sreq->tag, status, req); + if (req == NULL) { + fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag); + return; + } + + if (status == CHECK_CONDITION) { + req->senselen = scsi_req_get_sense(req->sreq, req->sense, + sizeof(req->sense)); + DPRINTF("VSCSI: Sense data, %d bytes:\n", req->senselen); + DPRINTF(" %02x %02x %02x %02x %02x %02x %02x %02x\n", + req->sense[0], req->sense[1], req->sense[2], req->sense[3], + req->sense[4], req->sense[5], req->sense[6], req->sense[7]); + DPRINTF(" %02x %02x %02x %02x %02x %02x %02x %02x\n", + req->sense[8], req->sense[9], req->sense[10], req->sense[11], + req->sense[12], req->sense[13], req->sense[14], req->sense[15]); + } + + 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, 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 = (VMStateField[]) { + VMSTATE_BUFFER(crq.raw, vscsi_req), + VMSTATE_BUFFER(iu.srp.reserved, 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); + + DPRINTF("VSCSI: saving tag=%u, current desc#%d, offset=%x\n", + 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); + + DPRINTF("VSCSI: restoring tag=%u, current desc#%d, offset=%x\n", + 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; + 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[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.srp; + SCSIDevice *sdev; + int n, lun; + + 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) { + DPRINTF("VSCSI: Command for lun %08" PRIx64 " with no drive\n", + 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, req); + n = scsi_req_enqueue(req->sreq); + + DPRINTF("VSCSI: Queued command tag 0x%x CMD 0x%x=%s LUN %d ret: %d\n", + 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; + 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; + + fprintf(stderr, "vscsi_process_tsk_mgmt %02x\n", + iu->srp.tsk_mgmt.tsk_mgmt_func); + + d = vscsi_device_find(&s->bus, be64_to_cpu(req->iu.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.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; + } + + qdev_reset_all(&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 (tmpreq->iu.srp.cmd.lun != req->iu.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 */ + 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.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_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.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 suppport 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.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 > sizeof(union viosrp_iu)) { + 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->iu, + 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 VIOsPAPRDevice *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); + + 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 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(VIOsPAPRDevice *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(VIOsPAPRDevice *dev, Error **errp) +{ + VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(dev); + + dev->crq.SendFunc = vscsi_do_crq; + + scsi_bus_new(&s->bus, sizeof(s->bus), DEVICE(dev), + &vscsi_scsi_info, NULL); + if (!dev->qdev.hotplugged) { + scsi_bus_legacy_handle_cmdline(&s->bus, errp); + } +} + +void spapr_vscsi_create(VIOsPAPRBus *bus) +{ + DeviceState *dev; + + dev = qdev_create(&bus->bus, "spapr-vscsi"); + + qdev_init_nofail(dev); +} + +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 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 = (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); + VIOsPAPRDeviceClass *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); + dc->props = 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) |
