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qemu-e2k/hw/scsi/spapr_vscsi.c
John Millikin fe9d8927e2 scsi: Add buf_len parameter to scsi_req_new() 
When a SCSI command is received from the guest, the CDB length implied
by the first byte might exceed the number of bytes the guest sent. In
this case scsi_req_new() will read uninitialized data, causing
unpredictable behavior.

Adds the buf_len parameter to scsi_req_new() and plumbs it through the
call stack.

Signed-off-by: John Millikin <john@john-millikin.com>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1127
Message-Id: <20220817053458.698416-1-john@john-millikin.com>
[Fill in correct length for adapters other than ESP. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-09-01 07:42:37 +02:00

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