diff options
Diffstat (limited to 'hw/spapr_vscsi.c')
| -rw-r--r-- | hw/spapr_vscsi.c | 988 |
1 files changed, 988 insertions, 0 deletions
diff --git a/hw/spapr_vscsi.c b/hw/spapr_vscsi.c new file mode 100644 index 0000000..e142dae --- /dev/null +++ b/hw/spapr_vscsi.c @@ -0,0 +1,988 @@ +/* + * 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 */ + SCSIDevice *sdev; + 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) +{ + req->active = 0; +} + +static vscsi_req *vscsi_find_req(VSCSIState *s, uint32_t 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; + + 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) +{ + SCSIDevice *sdev = req->sdev; + uint8_t *cdb = req->iu.srp.cmd.cdb; + int n; + + cdb[0] = 3; + cdb[1] = 0; + cdb[2] = 0; + cdb[3] = 0; + cdb[4] = 96; + cdb[5] = 0; + req->sensing = 1; + n = sdev->info->send_command(sdev, req->qtag, cdb, req->lun); + dprintf("VSCSI: Queued request sense tag 0x%x\n", req->qtag); + if (n < 0) { + fprintf(stderr, "VSCSI: REQUEST_SENSE wants write data !?!?!?\n"); + sdev->info->cancel_io(sdev, req->qtag); + vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0); + vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); + vscsi_put_req(s, req); + return; + } else if (n == 0) { + return; + } + sdev->info->read_data(sdev, req->qtag); +} + +/* Callback to indicate that the SCSI layer has completed a transfer. */ +static void vscsi_command_complete(SCSIBus *bus, int reason, uint32_t tag, + uint32_t arg) +{ + VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, bus->qbus.parent); + vscsi_req *req = vscsi_find_req(s, tag); + SCSIDevice *sdev; + uint8_t *buf; + int32_t res_in = 0, res_out = 0; + int len, rc = 0; + + dprintf("VSCSI: SCSI cmd complete, r=0x%x tag=0x%x arg=0x%x, req=%p\n", + reason, tag, arg, req); + if (req == NULL) { + fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", tag); + return; + } + sdev = req->sdev; + + if (req->sensing) { + if (reason == SCSI_REASON_DONE) { + dprintf("VSCSI: Sense done !\n"); + vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); + vscsi_put_req(s, req); + } else { + uint8_t *buf = sdev->info->get_buf(sdev, tag); + + len = MIN(arg, 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; + sdev->info->read_data(sdev, req->qtag); + } + return; + } + + if (reason == SCSI_REASON_DONE) { + dprintf("VSCSI: Command complete err=%d\n", arg); + if (arg == 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); + } else if (arg == CHECK_CONDITION) { + dprintf("VSCSI: Got CHECK_CONDITION, requesting sense...\n"); + vscsi_send_request_sense(s, req); + return; + } else { + vscsi_send_rsp(s, req, arg, 0, 0); + } + vscsi_put_req(s, req); + return; + } + + /* "arg" is how much we have read for reads and how much we want + * to write for writes (ie, how much is to be DMA'd) + */ + if (arg) { + buf = sdev->info->get_buf(sdev, tag); + rc = vscsi_srp_transfer_data(s, req, req->writing, buf, arg); + } + if (rc < 0) { + fprintf(stderr, "VSCSI: RDMA error rc=%d!\n", rc); + sdev->info->cancel_io(sdev, req->qtag); + vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0); + vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); + vscsi_put_req(s, req); + return; + } + + /* Start next chunk */ + req->data_len -= rc; + if (req->writing) { + sdev->info->write_data(sdev, req->qtag); + } else { + sdev->info->read_data(sdev, req->qtag); + } +} + +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->sdev = sdev; + req->lun = lun; + n = sdev->info->send_command(sdev, req->qtag, srp->cmd.cdb, lun); + + 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; + sdev->info->read_data(sdev, req->qtag); + } else if (n < 0) { + req->data_len = -n; + sdev->info->write_data(sdev, req->qtag); + } + /* 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 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_command_complete); + 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); |