root / hw / spapr_vscsi.c @ 0c34459b
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/*
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* QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
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*
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* PAPR Virtual SCSI, aka ibmvscsi
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*
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* Copyright (c) 2010,2011 Benjamin Herrenschmidt, IBM Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* TODO:
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*
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* - Cleanups :-)
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* - Sort out better how to assign devices to VSCSI instances
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* - Fix residual counts
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* - Add indirect descriptors support
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* - Maybe do autosense (PAPR seems to mandate it, linux doesn't care)
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*/
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#include "hw.h" |
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#include "scsi.h" |
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#include "scsi-defs.h" |
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#include "net.h" /* Remove that when we can */ |
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#include "srp.h" |
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#include "hw/qdev.h" |
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#include "hw/spapr.h" |
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#include "hw/spapr_vio.h" |
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#include "hw/ppc-viosrp.h" |
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#include <libfdt.h> |
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|
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/*#define DEBUG_VSCSI*/
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#ifdef DEBUG_VSCSI
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#define dprintf(fmt, ...) \
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do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) |
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#else
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#define dprintf(fmt, ...) \
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do { } while (0) |
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#endif
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/*
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* Virtual SCSI device
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*/
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/* Random numbers */
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#define VSCSI_MAX_SECTORS 4096 |
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#define VSCSI_REQ_LIMIT 24 |
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|
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#define SCSI_SENSE_BUF_SIZE 96 |
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#define SRP_RSP_SENSE_DATA_LEN 18 |
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typedef union vscsi_crq { |
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struct viosrp_crq s;
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uint8_t raw[16];
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} vscsi_crq; |
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|
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typedef struct vscsi_req { |
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vscsi_crq crq; |
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union viosrp_iu iu;
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|
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/* SCSI request tracking */
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SCSIRequest *sreq; |
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uint32_t qtag; /* qemu tag != srp tag */
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int lun;
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int active;
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long data_len;
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int writing;
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int sensing;
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int senselen;
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uint8_t sense[SCSI_SENSE_BUF_SIZE]; |
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|
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/* RDMA related bits */
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uint8_t dma_fmt; |
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struct srp_direct_buf ext_desc;
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struct srp_direct_buf *cur_desc;
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struct srp_indirect_buf *ind_desc;
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int local_desc;
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int total_desc;
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} vscsi_req; |
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typedef struct { |
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VIOsPAPRDevice vdev; |
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SCSIBus bus; |
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vscsi_req reqs[VSCSI_REQ_LIMIT]; |
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} VSCSIState; |
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|
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/* XXX Debug only */
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static VSCSIState *dbg_vscsi_state;
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static struct vscsi_req *vscsi_get_req(VSCSIState *s) |
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{
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vscsi_req *req; |
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int i;
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for (i = 0; i < VSCSI_REQ_LIMIT; i++) { |
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req = &s->reqs[i]; |
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if (!req->active) {
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memset(req, 0, sizeof(*req)); |
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req->qtag = i; |
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req->active = 1;
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return req;
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} |
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} |
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return NULL; |
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} |
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static void vscsi_put_req(VSCSIState *s, vscsi_req *req) |
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{
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if (req->sreq != NULL) { |
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scsi_req_unref(req->sreq); |
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} |
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req->sreq = NULL;
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req->active = 0;
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} |
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static vscsi_req *vscsi_find_req(VSCSIState *s, SCSIRequest *req)
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{
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uint32_t tag = req->tag; |
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if (tag >= VSCSI_REQ_LIMIT || !s->reqs[tag].active) {
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return NULL; |
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} |
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return &s->reqs[tag];
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} |
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static void vscsi_decode_id_lun(uint64_t srp_lun, int *id, int *lun) |
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{
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/* XXX Figure that one out properly ! This is crackpot */
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*id = (srp_lun >> 56) & 0x7f; |
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*lun = (srp_lun >> 48) & 0xff; |
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} |
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static int vscsi_send_iu(VSCSIState *s, vscsi_req *req, |
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uint64_t length, uint8_t format) |
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{
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long rc, rc1;
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/* First copy the SRP */
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rc = spapr_tce_dma_write(&s->vdev, req->crq.s.IU_data_ptr, |
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&req->iu, length); |
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if (rc) {
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fprintf(stderr, "vscsi_send_iu: DMA write failure !\n");
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} |
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req->crq.s.valid = 0x80;
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req->crq.s.format = format; |
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req->crq.s.reserved = 0x00;
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req->crq.s.timeout = cpu_to_be16(0x0000);
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req->crq.s.IU_length = cpu_to_be16(length); |
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req->crq.s.IU_data_ptr = req->iu.srp.rsp.tag; /* right byte order */
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if (rc == 0) { |
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req->crq.s.status = 0x99; /* Just needs to be non-zero */ |
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} else {
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req->crq.s.status = 0x00;
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} |
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rc1 = spapr_vio_send_crq(&s->vdev, req->crq.raw); |
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if (rc1) {
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fprintf(stderr, "vscsi_send_iu: Error sending response\n");
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return rc1;
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} |
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return rc;
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} |
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|
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static void vscsi_makeup_sense(VSCSIState *s, vscsi_req *req, |
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uint8_t key, uint8_t asc, uint8_t ascq) |
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{
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req->senselen = SRP_RSP_SENSE_DATA_LEN; |
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/* Valid bit and 'current errors' */
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req->sense[0] = (0x1 << 7 | 0x70); |
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/* Sense key */
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req->sense[2] = key;
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/* Additional sense length */
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req->sense[7] = 0xa; /* 10 bytes */ |
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/* Additional sense code */
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req->sense[12] = asc;
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req->sense[13] = ascq;
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} |
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|
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static int vscsi_send_rsp(VSCSIState *s, vscsi_req *req, |
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uint8_t status, int32_t res_in, int32_t res_out) |
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{
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union viosrp_iu *iu = &req->iu;
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uint64_t tag = iu->srp.rsp.tag; |
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int total_len = sizeof(iu->srp.rsp); |
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dprintf("VSCSI: Sending resp status: 0x%x, "
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"res_in: %d, res_out: %d\n", status, res_in, res_out);
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memset(iu, 0, sizeof(struct srp_rsp)); |
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iu->srp.rsp.opcode = SRP_RSP; |
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iu->srp.rsp.req_lim_delta = cpu_to_be32(1);
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iu->srp.rsp.tag = tag; |
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/* Handle residuals */
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if (res_in < 0) { |
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iu->srp.rsp.flags |= SRP_RSP_FLAG_DIUNDER; |
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res_in = -res_in; |
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} else if (res_in) { |
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iu->srp.rsp.flags |= SRP_RSP_FLAG_DIOVER; |
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} |
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if (res_out < 0) { |
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iu->srp.rsp.flags |= SRP_RSP_FLAG_DOUNDER; |
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res_out = -res_out; |
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} else if (res_out) { |
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iu->srp.rsp.flags |= SRP_RSP_FLAG_DOOVER; |
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} |
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iu->srp.rsp.data_in_res_cnt = cpu_to_be32(res_in); |
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iu->srp.rsp.data_out_res_cnt = cpu_to_be32(res_out); |
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|
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/* We don't do response data */
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/* iu->srp.rsp.flags &= ~SRP_RSP_FLAG_RSPVALID; */
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iu->srp.rsp.resp_data_len = cpu_to_be32(0);
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|
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/* Handle success vs. failure */
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iu->srp.rsp.status = status; |
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if (status) {
|
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iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x04) >> 2; |
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if (req->senselen) {
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req->iu.srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID; |
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req->iu.srp.rsp.sense_data_len = cpu_to_be32(req->senselen); |
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memcpy(req->iu.srp.rsp.data, req->sense, req->senselen); |
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total_len += req->senselen; |
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} |
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} else {
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iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x02) >> 1; |
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} |
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|
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vscsi_send_iu(s, req, total_len, VIOSRP_SRP_FORMAT); |
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return 0; |
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} |
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|
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static inline void vscsi_swap_desc(struct srp_direct_buf *desc) |
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{
|
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desc->va = be64_to_cpu(desc->va); |
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desc->len = be32_to_cpu(desc->len); |
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} |
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|
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static int vscsi_srp_direct_data(VSCSIState *s, vscsi_req *req, |
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uint8_t *buf, uint32_t len) |
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{
|
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struct srp_direct_buf *md = req->cur_desc;
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uint32_t llen; |
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int rc = 0; |
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|
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dprintf("VSCSI: direct segment 0x%x bytes, va=0x%llx desc len=0x%x\n",
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len, (unsigned long long)md->va, md->len); |
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|
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llen = MIN(len, md->len); |
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if (llen) {
|
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if (req->writing) { /* writing = to device = reading from memory */ |
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rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen); |
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} else {
|
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rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen); |
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} |
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} |
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md->len -= llen; |
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md->va += llen; |
| 278 |
|
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if (rc) {
|
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return -1; |
| 281 |
} |
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return llen;
|
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} |
| 284 |
|
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static int vscsi_srp_indirect_data(VSCSIState *s, vscsi_req *req, |
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uint8_t *buf, uint32_t len) |
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{
|
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struct srp_direct_buf *td = &req->ind_desc->table_desc;
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struct srp_direct_buf *md = req->cur_desc;
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int rc = 0; |
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uint32_t llen, total = 0;
|
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|
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dprintf("VSCSI: indirect segment 0x%x bytes, td va=0x%llx len=0x%x\n",
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len, (unsigned long long)td->va, td->len); |
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|
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/* While we have data ... */
|
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while (len) {
|
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/* If we have a descriptor but it's empty, go fetch a new one */
|
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if (md && md->len == 0) { |
| 300 |
/* More local available, use one */
|
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if (req->local_desc) {
|
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md = ++req->cur_desc; |
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--req->local_desc; |
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--req->total_desc; |
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td->va += sizeof(struct srp_direct_buf); |
| 306 |
} else {
|
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md = req->cur_desc = NULL;
|
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} |
| 309 |
} |
| 310 |
/* No descriptor at hand, fetch one */
|
| 311 |
if (!md) {
|
| 312 |
if (!req->total_desc) {
|
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dprintf("VSCSI: Out of descriptors !\n");
|
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break;
|
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} |
| 316 |
md = req->cur_desc = &req->ext_desc; |
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dprintf("VSCSI: Reading desc from 0x%llx\n",
|
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(unsigned long long)td->va); |
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rc = spapr_tce_dma_read(&s->vdev, td->va, md, |
| 320 |
sizeof(struct srp_direct_buf)); |
| 321 |
if (rc) {
|
| 322 |
dprintf("VSCSI: tce_dma_read -> %d reading ext_desc\n", rc);
|
| 323 |
break;
|
| 324 |
} |
| 325 |
vscsi_swap_desc(md); |
| 326 |
td->va += sizeof(struct srp_direct_buf); |
| 327 |
--req->total_desc; |
| 328 |
} |
| 329 |
dprintf("VSCSI: [desc va=0x%llx,len=0x%x] remaining=0x%x\n",
|
| 330 |
(unsigned long long)md->va, md->len, len); |
| 331 |
|
| 332 |
/* Perform transfer */
|
| 333 |
llen = MIN(len, md->len); |
| 334 |
if (req->writing) { /* writing = to device = reading from memory */ |
| 335 |
rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen); |
| 336 |
} else {
|
| 337 |
rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen); |
| 338 |
} |
| 339 |
if (rc) {
|
| 340 |
dprintf("VSCSI: tce_dma_r/w(%d) -> %d\n", req->writing, rc);
|
| 341 |
break;
|
| 342 |
} |
| 343 |
dprintf("VSCSI: data: %02x %02x %02x %02x...\n",
|
| 344 |
buf[0], buf[1], buf[2], buf[3]); |
| 345 |
|
| 346 |
len -= llen; |
| 347 |
buf += llen; |
| 348 |
total += llen; |
| 349 |
md->va += llen; |
| 350 |
md->len -= llen; |
| 351 |
} |
| 352 |
return rc ? -1 : total; |
| 353 |
} |
| 354 |
|
| 355 |
static int vscsi_srp_transfer_data(VSCSIState *s, vscsi_req *req, |
| 356 |
int writing, uint8_t *buf, uint32_t len)
|
| 357 |
{
|
| 358 |
int err = 0; |
| 359 |
|
| 360 |
switch (req->dma_fmt) {
|
| 361 |
case SRP_NO_DATA_DESC:
|
| 362 |
dprintf("VSCSI: no data desc transfer, skipping 0x%x bytes\n", len);
|
| 363 |
break;
|
| 364 |
case SRP_DATA_DESC_DIRECT:
|
| 365 |
err = vscsi_srp_direct_data(s, req, buf, len); |
| 366 |
break;
|
| 367 |
case SRP_DATA_DESC_INDIRECT:
|
| 368 |
err = vscsi_srp_indirect_data(s, req, buf, len); |
| 369 |
break;
|
| 370 |
} |
| 371 |
return err;
|
| 372 |
} |
| 373 |
|
| 374 |
/* Bits from linux srp */
|
| 375 |
static int data_out_desc_size(struct srp_cmd *cmd) |
| 376 |
{
|
| 377 |
int size = 0; |
| 378 |
uint8_t fmt = cmd->buf_fmt >> 4;
|
| 379 |
|
| 380 |
switch (fmt) {
|
| 381 |
case SRP_NO_DATA_DESC:
|
| 382 |
break;
|
| 383 |
case SRP_DATA_DESC_DIRECT:
|
| 384 |
size = sizeof(struct srp_direct_buf); |
| 385 |
break;
|
| 386 |
case SRP_DATA_DESC_INDIRECT:
|
| 387 |
size = sizeof(struct srp_indirect_buf) + |
| 388 |
sizeof(struct srp_direct_buf)*cmd->data_out_desc_cnt; |
| 389 |
break;
|
| 390 |
default:
|
| 391 |
break;
|
| 392 |
} |
| 393 |
return size;
|
| 394 |
} |
| 395 |
|
| 396 |
static int vscsi_preprocess_desc(vscsi_req *req) |
| 397 |
{
|
| 398 |
struct srp_cmd *cmd = &req->iu.srp.cmd;
|
| 399 |
int offset, i;
|
| 400 |
|
| 401 |
offset = cmd->add_cdb_len & ~3;
|
| 402 |
|
| 403 |
if (req->writing) {
|
| 404 |
req->dma_fmt = cmd->buf_fmt >> 4;
|
| 405 |
} else {
|
| 406 |
offset += data_out_desc_size(cmd); |
| 407 |
req->dma_fmt = cmd->buf_fmt & ((1U << 4) - 1); |
| 408 |
} |
| 409 |
|
| 410 |
switch (req->dma_fmt) {
|
| 411 |
case SRP_NO_DATA_DESC:
|
| 412 |
break;
|
| 413 |
case SRP_DATA_DESC_DIRECT:
|
| 414 |
req->cur_desc = (struct srp_direct_buf *)(cmd->add_data + offset);
|
| 415 |
req->total_desc = req->local_desc = 1;
|
| 416 |
vscsi_swap_desc(req->cur_desc); |
| 417 |
dprintf("VSCSI: using direct RDMA %s, 0x%x bytes MD: 0x%llx\n",
|
| 418 |
req->writing ? "write" : "read", |
| 419 |
req->cur_desc->len, (unsigned long long)req->cur_desc->va); |
| 420 |
break;
|
| 421 |
case SRP_DATA_DESC_INDIRECT:
|
| 422 |
req->ind_desc = (struct srp_indirect_buf *)(cmd->add_data + offset);
|
| 423 |
vscsi_swap_desc(&req->ind_desc->table_desc); |
| 424 |
req->total_desc = req->ind_desc->table_desc.len / |
| 425 |
sizeof(struct srp_direct_buf); |
| 426 |
req->local_desc = req->writing ? cmd->data_out_desc_cnt : |
| 427 |
cmd->data_in_desc_cnt; |
| 428 |
for (i = 0; i < req->local_desc; i++) { |
| 429 |
vscsi_swap_desc(&req->ind_desc->desc_list[i]); |
| 430 |
} |
| 431 |
req->cur_desc = req->local_desc ? &req->ind_desc->desc_list[0] : NULL; |
| 432 |
dprintf("VSCSI: using indirect RDMA %s, 0x%x bytes %d descs "
|
| 433 |
"(%d local) VA: 0x%llx\n",
|
| 434 |
req->writing ? "read" : "write", |
| 435 |
be32_to_cpu(req->ind_desc->len), |
| 436 |
req->total_desc, req->local_desc, |
| 437 |
(unsigned long long)req->ind_desc->table_desc.va); |
| 438 |
break;
|
| 439 |
default:
|
| 440 |
fprintf(stderr, |
| 441 |
"vscsi_preprocess_desc: Unknown format %x\n", req->dma_fmt);
|
| 442 |
return -1; |
| 443 |
} |
| 444 |
|
| 445 |
return 0; |
| 446 |
} |
| 447 |
|
| 448 |
static void vscsi_send_request_sense(VSCSIState *s, vscsi_req *req) |
| 449 |
{
|
| 450 |
uint8_t *cdb = req->iu.srp.cmd.cdb; |
| 451 |
int n;
|
| 452 |
|
| 453 |
cdb[0] = 3; |
| 454 |
cdb[1] = 0; |
| 455 |
cdb[2] = 0; |
| 456 |
cdb[3] = 0; |
| 457 |
cdb[4] = 96; |
| 458 |
cdb[5] = 0; |
| 459 |
req->sensing = 1;
|
| 460 |
n = scsi_req_enqueue(req->sreq, cdb); |
| 461 |
dprintf("VSCSI: Queued request sense tag 0x%x\n", req->qtag);
|
| 462 |
if (n < 0) { |
| 463 |
fprintf(stderr, "VSCSI: REQUEST_SENSE wants write data !?!?!?\n");
|
| 464 |
vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0); |
| 465 |
scsi_req_abort(req->sreq, CHECK_CONDITION); |
| 466 |
return;
|
| 467 |
} else if (n == 0) { |
| 468 |
return;
|
| 469 |
} |
| 470 |
scsi_req_continue(req->sreq); |
| 471 |
} |
| 472 |
|
| 473 |
/* Callback to indicate that the SCSI layer has completed a transfer. */
|
| 474 |
static void vscsi_command_complete(SCSIRequest *sreq, int reason, uint32_t arg) |
| 475 |
{
|
| 476 |
VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent); |
| 477 |
vscsi_req *req = vscsi_find_req(s, sreq); |
| 478 |
uint8_t *buf; |
| 479 |
int32_t res_in = 0, res_out = 0; |
| 480 |
int len, rc = 0; |
| 481 |
|
| 482 |
dprintf("VSCSI: SCSI cmd complete, r=0x%x tag=0x%x arg=0x%x, req=%p\n",
|
| 483 |
reason, sreq->tag, arg, req); |
| 484 |
if (req == NULL) { |
| 485 |
fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
|
| 486 |
return;
|
| 487 |
} |
| 488 |
|
| 489 |
if (req->sensing) {
|
| 490 |
if (reason == SCSI_REASON_DONE) {
|
| 491 |
dprintf("VSCSI: Sense done !\n");
|
| 492 |
vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); |
| 493 |
vscsi_put_req(s, req); |
| 494 |
} else {
|
| 495 |
uint8_t *buf = scsi_req_get_buf(sreq); |
| 496 |
|
| 497 |
len = MIN(arg, SCSI_SENSE_BUF_SIZE); |
| 498 |
dprintf("VSCSI: Sense data, %d bytes:\n", len);
|
| 499 |
dprintf(" %02x %02x %02x %02x %02x %02x %02x %02x\n",
|
| 500 |
buf[0], buf[1], buf[2], buf[3], |
| 501 |
buf[4], buf[5], buf[6], buf[7]); |
| 502 |
dprintf(" %02x %02x %02x %02x %02x %02x %02x %02x\n",
|
| 503 |
buf[8], buf[9], buf[10], buf[11], |
| 504 |
buf[12], buf[13], buf[14], buf[15]); |
| 505 |
memcpy(req->sense, buf, len); |
| 506 |
req->senselen = len; |
| 507 |
scsi_req_continue(req->sreq); |
| 508 |
} |
| 509 |
return;
|
| 510 |
} |
| 511 |
|
| 512 |
if (reason == SCSI_REASON_DONE) {
|
| 513 |
dprintf("VSCSI: Command complete err=%d\n", arg);
|
| 514 |
if (arg == 0) { |
| 515 |
/* We handle overflows, not underflows for normal commands,
|
| 516 |
* but hopefully nobody cares
|
| 517 |
*/
|
| 518 |
if (req->writing) {
|
| 519 |
res_out = req->data_len; |
| 520 |
} else {
|
| 521 |
res_in = req->data_len; |
| 522 |
} |
| 523 |
vscsi_send_rsp(s, req, 0, res_in, res_out);
|
| 524 |
} else if (arg == CHECK_CONDITION) { |
| 525 |
dprintf("VSCSI: Got CHECK_CONDITION, requesting sense...\n");
|
| 526 |
vscsi_send_request_sense(s, req); |
| 527 |
return;
|
| 528 |
} else {
|
| 529 |
vscsi_send_rsp(s, req, arg, 0, 0); |
| 530 |
} |
| 531 |
vscsi_put_req(s, req); |
| 532 |
return;
|
| 533 |
} |
| 534 |
|
| 535 |
/* "arg" is how much we have read for reads and how much we want
|
| 536 |
* to write for writes (ie, how much is to be DMA'd)
|
| 537 |
*/
|
| 538 |
if (arg) {
|
| 539 |
buf = scsi_req_get_buf(sreq); |
| 540 |
rc = vscsi_srp_transfer_data(s, req, req->writing, buf, arg); |
| 541 |
} |
| 542 |
if (rc < 0) { |
| 543 |
fprintf(stderr, "VSCSI: RDMA error rc=%d!\n", rc);
|
| 544 |
vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0); |
| 545 |
scsi_req_abort(req->sreq, CHECK_CONDITION); |
| 546 |
return;
|
| 547 |
} |
| 548 |
|
| 549 |
/* Start next chunk */
|
| 550 |
req->data_len -= rc; |
| 551 |
scsi_req_continue(sreq); |
| 552 |
} |
| 553 |
|
| 554 |
static void vscsi_request_cancelled(SCSIRequest *sreq) |
| 555 |
{
|
| 556 |
VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent); |
| 557 |
vscsi_req *req = vscsi_find_req(s, sreq); |
| 558 |
|
| 559 |
vscsi_put_req(s, req); |
| 560 |
} |
| 561 |
|
| 562 |
static void vscsi_process_login(VSCSIState *s, vscsi_req *req) |
| 563 |
{
|
| 564 |
union viosrp_iu *iu = &req->iu;
|
| 565 |
struct srp_login_rsp *rsp = &iu->srp.login_rsp;
|
| 566 |
uint64_t tag = iu->srp.rsp.tag; |
| 567 |
|
| 568 |
dprintf("VSCSI: Got login, sendin response !\n");
|
| 569 |
|
| 570 |
/* TODO handle case that requested size is wrong and
|
| 571 |
* buffer format is wrong
|
| 572 |
*/
|
| 573 |
memset(iu, 0, sizeof(struct srp_login_rsp)); |
| 574 |
rsp->opcode = SRP_LOGIN_RSP; |
| 575 |
/* Don't advertise quite as many request as we support to
|
| 576 |
* keep room for management stuff etc...
|
| 577 |
*/
|
| 578 |
rsp->req_lim_delta = cpu_to_be32(VSCSI_REQ_LIMIT-2);
|
| 579 |
rsp->tag = tag; |
| 580 |
rsp->max_it_iu_len = cpu_to_be32(sizeof(union srp_iu)); |
| 581 |
rsp->max_ti_iu_len = cpu_to_be32(sizeof(union srp_iu)); |
| 582 |
/* direct and indirect */
|
| 583 |
rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT); |
| 584 |
|
| 585 |
vscsi_send_iu(s, req, sizeof(*rsp), VIOSRP_SRP_FORMAT);
|
| 586 |
} |
| 587 |
|
| 588 |
static void vscsi_inquiry_no_target(VSCSIState *s, vscsi_req *req) |
| 589 |
{
|
| 590 |
uint8_t *cdb = req->iu.srp.cmd.cdb; |
| 591 |
uint8_t resp_data[36];
|
| 592 |
int rc, len, alen;
|
| 593 |
|
| 594 |
/* We dont do EVPD. Also check that page_code is 0 */
|
| 595 |
if ((cdb[1] & 0x01) || (cdb[1] & 0x01) || cdb[2] != 0) { |
| 596 |
/* Send INVALID FIELD IN CDB */
|
| 597 |
vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0); |
| 598 |
vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); |
| 599 |
return;
|
| 600 |
} |
| 601 |
alen = cdb[3];
|
| 602 |
alen = (alen << 8) | cdb[4]; |
| 603 |
len = MIN(alen, 36);
|
| 604 |
|
| 605 |
/* Fake up inquiry using PQ=3 */
|
| 606 |
memset(resp_data, 0, 36); |
| 607 |
resp_data[0] = 0x7f; /* Not capable of supporting a device here */ |
| 608 |
resp_data[2] = 0x06; /* SPS-4 */ |
| 609 |
resp_data[3] = 0x02; /* Resp data format */ |
| 610 |
resp_data[4] = 36 - 5; /* Additional length */ |
| 611 |
resp_data[7] = 0x10; /* Sync transfers */ |
| 612 |
memcpy(&resp_data[16], "QEMU EMPTY ", 16); |
| 613 |
memcpy(&resp_data[8], "QEMU ", 8); |
| 614 |
|
| 615 |
req->writing = 0;
|
| 616 |
vscsi_preprocess_desc(req); |
| 617 |
rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len);
|
| 618 |
if (rc < 0) { |
| 619 |
vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0); |
| 620 |
vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); |
| 621 |
} else {
|
| 622 |
vscsi_send_rsp(s, req, 0, 36 - rc, 0); |
| 623 |
} |
| 624 |
} |
| 625 |
|
| 626 |
static int vscsi_queue_cmd(VSCSIState *s, vscsi_req *req) |
| 627 |
{
|
| 628 |
union srp_iu *srp = &req->iu.srp;
|
| 629 |
SCSIDevice *sdev; |
| 630 |
int n, id, lun;
|
| 631 |
|
| 632 |
vscsi_decode_id_lun(be64_to_cpu(srp->cmd.lun), &id, &lun); |
| 633 |
|
| 634 |
/* Qemu vs. linux issue with LUNs to be sorted out ... */
|
| 635 |
sdev = (id < 8 && lun < 16) ? s->bus.devs[id] : NULL; |
| 636 |
if (!sdev) {
|
| 637 |
dprintf("VSCSI: Command for id %d with no drive\n", id);
|
| 638 |
if (srp->cmd.cdb[0] == INQUIRY) { |
| 639 |
vscsi_inquiry_no_target(s, req); |
| 640 |
} else {
|
| 641 |
vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0x00); |
| 642 |
vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); |
| 643 |
} return 1; |
| 644 |
} |
| 645 |
|
| 646 |
req->lun = lun; |
| 647 |
req->sreq = scsi_req_new(sdev, req->qtag, lun); |
| 648 |
n = scsi_req_enqueue(req->sreq, srp->cmd.cdb); |
| 649 |
|
| 650 |
dprintf("VSCSI: Queued command tag 0x%x CMD 0x%x ID %d LUN %d ret: %d\n",
|
| 651 |
req->qtag, srp->cmd.cdb[0], id, lun, n);
|
| 652 |
|
| 653 |
if (n) {
|
| 654 |
/* Transfer direction must be set before preprocessing the
|
| 655 |
* descriptors
|
| 656 |
*/
|
| 657 |
req->writing = (n < 1);
|
| 658 |
|
| 659 |
/* Preprocess RDMA descriptors */
|
| 660 |
vscsi_preprocess_desc(req); |
| 661 |
|
| 662 |
/* Get transfer direction and initiate transfer */
|
| 663 |
if (n > 0) { |
| 664 |
req->data_len = n; |
| 665 |
} else if (n < 0) { |
| 666 |
req->data_len = -n; |
| 667 |
} |
| 668 |
scsi_req_continue(req->sreq); |
| 669 |
} |
| 670 |
/* Don't touch req here, it may have been recycled already */
|
| 671 |
|
| 672 |
return 0; |
| 673 |
} |
| 674 |
|
| 675 |
static int vscsi_process_tsk_mgmt(VSCSIState *s, vscsi_req *req) |
| 676 |
{
|
| 677 |
union viosrp_iu *iu = &req->iu;
|
| 678 |
int fn;
|
| 679 |
|
| 680 |
fprintf(stderr, "vscsi_process_tsk_mgmt %02x\n",
|
| 681 |
iu->srp.tsk_mgmt.tsk_mgmt_func); |
| 682 |
|
| 683 |
switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
|
| 684 |
#if 0 /* We really don't deal with these for now */
|
| 685 |
case SRP_TSK_ABORT_TASK:
|
| 686 |
fn = ABORT_TASK;
|
| 687 |
break;
|
| 688 |
case SRP_TSK_ABORT_TASK_SET:
|
| 689 |
fn = ABORT_TASK_SET;
|
| 690 |
break;
|
| 691 |
case SRP_TSK_CLEAR_TASK_SET:
|
| 692 |
fn = CLEAR_TASK_SET;
|
| 693 |
break;
|
| 694 |
case SRP_TSK_LUN_RESET:
|
| 695 |
fn = LOGICAL_UNIT_RESET;
|
| 696 |
break;
|
| 697 |
case SRP_TSK_CLEAR_ACA:
|
| 698 |
fn = CLEAR_ACA;
|
| 699 |
break;
|
| 700 |
#endif
|
| 701 |
default:
|
| 702 |
fn = 0;
|
| 703 |
} |
| 704 |
if (fn) {
|
| 705 |
/* XXX Send/Handle target task management */
|
| 706 |
; |
| 707 |
} else {
|
| 708 |
vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x20, 0); |
| 709 |
vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); |
| 710 |
} |
| 711 |
return !fn;
|
| 712 |
} |
| 713 |
|
| 714 |
static int vscsi_handle_srp_req(VSCSIState *s, vscsi_req *req) |
| 715 |
{
|
| 716 |
union srp_iu *srp = &req->iu.srp;
|
| 717 |
int done = 1; |
| 718 |
uint8_t opcode = srp->rsp.opcode; |
| 719 |
|
| 720 |
switch (opcode) {
|
| 721 |
case SRP_LOGIN_REQ:
|
| 722 |
vscsi_process_login(s, req); |
| 723 |
break;
|
| 724 |
case SRP_TSK_MGMT:
|
| 725 |
done = vscsi_process_tsk_mgmt(s, req); |
| 726 |
break;
|
| 727 |
case SRP_CMD:
|
| 728 |
done = vscsi_queue_cmd(s, req); |
| 729 |
break;
|
| 730 |
case SRP_LOGIN_RSP:
|
| 731 |
case SRP_I_LOGOUT:
|
| 732 |
case SRP_T_LOGOUT:
|
| 733 |
case SRP_RSP:
|
| 734 |
case SRP_CRED_REQ:
|
| 735 |
case SRP_CRED_RSP:
|
| 736 |
case SRP_AER_REQ:
|
| 737 |
case SRP_AER_RSP:
|
| 738 |
fprintf(stderr, "VSCSI: Unsupported opcode %02x\n", opcode);
|
| 739 |
break;
|
| 740 |
default:
|
| 741 |
fprintf(stderr, "VSCSI: Unknown type %02x\n", opcode);
|
| 742 |
} |
| 743 |
|
| 744 |
return done;
|
| 745 |
} |
| 746 |
|
| 747 |
static int vscsi_send_adapter_info(VSCSIState *s, vscsi_req *req) |
| 748 |
{
|
| 749 |
struct viosrp_adapter_info *sinfo;
|
| 750 |
struct mad_adapter_info_data info;
|
| 751 |
int rc;
|
| 752 |
|
| 753 |
sinfo = &req->iu.mad.adapter_info; |
| 754 |
|
| 755 |
#if 0 /* What for ? */
|
| 756 |
rc = spapr_tce_dma_read(&s->vdev, be64_to_cpu(sinfo->buffer),
|
| 757 |
&info, be16_to_cpu(sinfo->common.length));
|
| 758 |
if (rc) {
|
| 759 |
fprintf(stderr, "vscsi_send_adapter_info: DMA read failure !\n");
|
| 760 |
}
|
| 761 |
#endif
|
| 762 |
memset(&info, 0, sizeof(info)); |
| 763 |
strcpy(info.srp_version, SRP_VERSION); |
| 764 |
strncpy(info.partition_name, "qemu", sizeof("qemu")); |
| 765 |
info.partition_number = cpu_to_be32(0);
|
| 766 |
info.mad_version = cpu_to_be32(1);
|
| 767 |
info.os_type = cpu_to_be32(2);
|
| 768 |
info.port_max_txu[0] = cpu_to_be32(VSCSI_MAX_SECTORS << 9); |
| 769 |
|
| 770 |
rc = spapr_tce_dma_write(&s->vdev, be64_to_cpu(sinfo->buffer), |
| 771 |
&info, be16_to_cpu(sinfo->common.length)); |
| 772 |
if (rc) {
|
| 773 |
fprintf(stderr, "vscsi_send_adapter_info: DMA write failure !\n");
|
| 774 |
} |
| 775 |
|
| 776 |
sinfo->common.status = rc ? cpu_to_be32(1) : 0; |
| 777 |
|
| 778 |
return vscsi_send_iu(s, req, sizeof(*sinfo), VIOSRP_MAD_FORMAT); |
| 779 |
} |
| 780 |
|
| 781 |
static int vscsi_handle_mad_req(VSCSIState *s, vscsi_req *req) |
| 782 |
{
|
| 783 |
union mad_iu *mad = &req->iu.mad;
|
| 784 |
|
| 785 |
switch (be32_to_cpu(mad->empty_iu.common.type)) {
|
| 786 |
case VIOSRP_EMPTY_IU_TYPE:
|
| 787 |
fprintf(stderr, "Unsupported EMPTY MAD IU\n");
|
| 788 |
break;
|
| 789 |
case VIOSRP_ERROR_LOG_TYPE:
|
| 790 |
fprintf(stderr, "Unsupported ERROR LOG MAD IU\n");
|
| 791 |
mad->error_log.common.status = cpu_to_be16(1);
|
| 792 |
vscsi_send_iu(s, req, sizeof(mad->error_log), VIOSRP_MAD_FORMAT);
|
| 793 |
break;
|
| 794 |
case VIOSRP_ADAPTER_INFO_TYPE:
|
| 795 |
vscsi_send_adapter_info(s, req); |
| 796 |
break;
|
| 797 |
case VIOSRP_HOST_CONFIG_TYPE:
|
| 798 |
mad->host_config.common.status = cpu_to_be16(1);
|
| 799 |
vscsi_send_iu(s, req, sizeof(mad->host_config), VIOSRP_MAD_FORMAT);
|
| 800 |
break;
|
| 801 |
default:
|
| 802 |
fprintf(stderr, "VSCSI: Unknown MAD type %02x\n",
|
| 803 |
be32_to_cpu(mad->empty_iu.common.type)); |
| 804 |
} |
| 805 |
|
| 806 |
return 1; |
| 807 |
} |
| 808 |
|
| 809 |
static void vscsi_got_payload(VSCSIState *s, vscsi_crq *crq) |
| 810 |
{
|
| 811 |
vscsi_req *req; |
| 812 |
int done;
|
| 813 |
|
| 814 |
req = vscsi_get_req(s); |
| 815 |
if (req == NULL) { |
| 816 |
fprintf(stderr, "VSCSI: Failed to get a request !\n");
|
| 817 |
return;
|
| 818 |
} |
| 819 |
|
| 820 |
/* We only support a limited number of descriptors, we know
|
| 821 |
* the ibmvscsi driver uses up to 10 max, so it should fit
|
| 822 |
* in our 256 bytes IUs. If not we'll have to increase the size
|
| 823 |
* of the structure.
|
| 824 |
*/
|
| 825 |
if (crq->s.IU_length > sizeof(union viosrp_iu)) { |
| 826 |
fprintf(stderr, "VSCSI: SRP IU too long (%d bytes) !\n",
|
| 827 |
crq->s.IU_length); |
| 828 |
return;
|
| 829 |
} |
| 830 |
|
| 831 |
/* XXX Handle failure differently ? */
|
| 832 |
if (spapr_tce_dma_read(&s->vdev, crq->s.IU_data_ptr, &req->iu,
|
| 833 |
crq->s.IU_length)) {
|
| 834 |
fprintf(stderr, "vscsi_got_payload: DMA read failure !\n");
|
| 835 |
qemu_free(req); |
| 836 |
} |
| 837 |
memcpy(&req->crq, crq, sizeof(vscsi_crq));
|
| 838 |
|
| 839 |
if (crq->s.format == VIOSRP_MAD_FORMAT) {
|
| 840 |
done = vscsi_handle_mad_req(s, req); |
| 841 |
} else {
|
| 842 |
done = vscsi_handle_srp_req(s, req); |
| 843 |
} |
| 844 |
|
| 845 |
if (done) {
|
| 846 |
vscsi_put_req(s, req); |
| 847 |
} |
| 848 |
} |
| 849 |
|
| 850 |
|
| 851 |
static int vscsi_do_crq(struct VIOsPAPRDevice *dev, uint8_t *crq_data) |
| 852 |
{
|
| 853 |
VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev); |
| 854 |
vscsi_crq crq; |
| 855 |
|
| 856 |
memcpy(crq.raw, crq_data, 16);
|
| 857 |
crq.s.timeout = be16_to_cpu(crq.s.timeout); |
| 858 |
crq.s.IU_length = be16_to_cpu(crq.s.IU_length); |
| 859 |
crq.s.IU_data_ptr = be64_to_cpu(crq.s.IU_data_ptr); |
| 860 |
|
| 861 |
dprintf("VSCSI: do_crq %02x %02x ...\n", crq.raw[0], crq.raw[1]); |
| 862 |
|
| 863 |
switch (crq.s.valid) {
|
| 864 |
case 0xc0: /* Init command/response */ |
| 865 |
|
| 866 |
/* Respond to initialization request */
|
| 867 |
if (crq.s.format == 0x01) { |
| 868 |
memset(crq.raw, 0, 16); |
| 869 |
crq.s.valid = 0xc0;
|
| 870 |
crq.s.format = 0x02;
|
| 871 |
spapr_vio_send_crq(dev, crq.raw); |
| 872 |
} |
| 873 |
|
| 874 |
/* Note that in hotplug cases, we might get a 0x02
|
| 875 |
* as a result of us emitting the init request
|
| 876 |
*/
|
| 877 |
|
| 878 |
break;
|
| 879 |
case 0xff: /* Link event */ |
| 880 |
|
| 881 |
/* Not handled for now */
|
| 882 |
|
| 883 |
break;
|
| 884 |
case 0x80: /* Payloads */ |
| 885 |
switch (crq.s.format) {
|
| 886 |
case VIOSRP_SRP_FORMAT: /* AKA VSCSI request */ |
| 887 |
case VIOSRP_MAD_FORMAT: /* AKA VSCSI response */ |
| 888 |
vscsi_got_payload(s, &crq); |
| 889 |
break;
|
| 890 |
case VIOSRP_OS400_FORMAT:
|
| 891 |
case VIOSRP_AIX_FORMAT:
|
| 892 |
case VIOSRP_LINUX_FORMAT:
|
| 893 |
case VIOSRP_INLINE_FORMAT:
|
| 894 |
fprintf(stderr, "vscsi_do_srq: Unsupported payload format %02x\n",
|
| 895 |
crq.s.format); |
| 896 |
break;
|
| 897 |
default:
|
| 898 |
fprintf(stderr, "vscsi_do_srq: Unknown payload format %02x\n",
|
| 899 |
crq.s.format); |
| 900 |
} |
| 901 |
break;
|
| 902 |
default:
|
| 903 |
fprintf(stderr, "vscsi_do_crq: unknown CRQ %02x %02x ...\n",
|
| 904 |
crq.raw[0], crq.raw[1]); |
| 905 |
}; |
| 906 |
|
| 907 |
return 0; |
| 908 |
} |
| 909 |
|
| 910 |
static const struct SCSIBusOps vscsi_scsi_ops = { |
| 911 |
.complete = vscsi_command_complete, |
| 912 |
.cancel = vscsi_request_cancelled |
| 913 |
}; |
| 914 |
|
| 915 |
static int spapr_vscsi_init(VIOsPAPRDevice *dev) |
| 916 |
{
|
| 917 |
VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev); |
| 918 |
int i;
|
| 919 |
|
| 920 |
dbg_vscsi_state = s; |
| 921 |
|
| 922 |
/* Initialize qemu request tags */
|
| 923 |
memset(s->reqs, 0, sizeof(s->reqs)); |
| 924 |
for (i = 0; i < VSCSI_REQ_LIMIT; i++) { |
| 925 |
s->reqs[i].qtag = i; |
| 926 |
} |
| 927 |
|
| 928 |
dev->crq.SendFunc = vscsi_do_crq; |
| 929 |
|
| 930 |
scsi_bus_new(&s->bus, &dev->qdev, 1, VSCSI_REQ_LIMIT,
|
| 931 |
&vscsi_scsi_ops); |
| 932 |
if (!dev->qdev.hotplugged) {
|
| 933 |
scsi_bus_legacy_handle_cmdline(&s->bus); |
| 934 |
} |
| 935 |
|
| 936 |
return 0; |
| 937 |
} |
| 938 |
|
| 939 |
void spapr_vscsi_create(VIOsPAPRBus *bus, uint32_t reg,
|
| 940 |
qemu_irq qirq, uint32_t vio_irq_num) |
| 941 |
{
|
| 942 |
DeviceState *dev; |
| 943 |
VIOsPAPRDevice *sdev; |
| 944 |
|
| 945 |
dev = qdev_create(&bus->bus, "spapr-vscsi");
|
| 946 |
qdev_prop_set_uint32(dev, "reg", reg);
|
| 947 |
|
| 948 |
qdev_init_nofail(dev); |
| 949 |
|
| 950 |
sdev = (VIOsPAPRDevice *)dev; |
| 951 |
sdev->qirq = qirq; |
| 952 |
sdev->vio_irq_num = vio_irq_num; |
| 953 |
} |
| 954 |
|
| 955 |
static int spapr_vscsi_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off) |
| 956 |
{
|
| 957 |
int ret;
|
| 958 |
|
| 959 |
ret = fdt_setprop_cell(fdt, node_off, "#address-cells", 2); |
| 960 |
if (ret < 0) { |
| 961 |
return ret;
|
| 962 |
} |
| 963 |
|
| 964 |
ret = fdt_setprop_cell(fdt, node_off, "#size-cells", 0); |
| 965 |
if (ret < 0) { |
| 966 |
return ret;
|
| 967 |
} |
| 968 |
|
| 969 |
return 0; |
| 970 |
} |
| 971 |
|
| 972 |
static VIOsPAPRDeviceInfo spapr_vscsi = {
|
| 973 |
.init = spapr_vscsi_init, |
| 974 |
.devnode = spapr_vscsi_devnode, |
| 975 |
.dt_name = "v-scsi",
|
| 976 |
.dt_type = "vscsi",
|
| 977 |
.dt_compatible = "IBM,v-scsi",
|
| 978 |
.signal_mask = 0x00000001,
|
| 979 |
.qdev.name = "spapr-vscsi",
|
| 980 |
.qdev.size = sizeof(VSCSIState),
|
| 981 |
.qdev.props = (Property[]) {
|
| 982 |
DEFINE_PROP_UINT32("reg", VIOsPAPRDevice, reg, 0x2000), |
| 983 |
DEFINE_PROP_UINT32("dma-window", VIOsPAPRDevice,
|
| 984 |
rtce_window_size, 0x10000000),
|
| 985 |
DEFINE_PROP_END_OF_LIST(), |
| 986 |
}, |
| 987 |
}; |
| 988 |
|
| 989 |
static void spapr_vscsi_register(void) |
| 990 |
{
|
| 991 |
spapr_vio_bus_register_withprop(&spapr_vscsi); |
| 992 |
} |
| 993 |
device_init(spapr_vscsi_register); |