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qemu/hw/scsi/spapr_vscsi.c
Alexey Kardashevskiy eb37f14658 spapr-vscsi: add task management 
At the moment the guest kernel issues two types of task management
requests to the hypervisor - task about and lun reset. This adds
handling for these tasks. As spapr-vscsi starts calling scsi_req_cancel(),
free_request callback was implemented.

As virtio-vscsi, spapr-vscsi does not handle CLEAR_ACA either as CDB
control byte does not seem to be used at all so NACA bit is not
set to the guest so the guest has no good reason to call CLEAR_ACA task.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
[Fix choice of UCSOLCNT vs. SCSOLCNT. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-09-12 08:46:21 +02:00

1176 lines
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/*
* 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 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 */
bool active;
uint32_t data_len;
bool writing;
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 = 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);
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);
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, 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;
vscsi_put_req(req);
}
static const VMStateDescription vmstate_spapr_vscsi_req = {
.name = "spapr_vscsi_req",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 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);
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[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, lun;
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 LUN %d ret: %d\n",
req->qtag, 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_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);
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 int spapr_vscsi_init(VIOsPAPRDevice *dev)
{
VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(dev);
Error *err = NULL;
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, &err);
if (err != NULL) {
error_free(err);
return -1;
}
}
return 0;
}
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,
.minimum_version_id_old = 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->init = spapr_vscsi_init;
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;
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)
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