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1.1 root 1: /*
2: * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
3: *
4: * PAPR Virtual SCSI, aka ibmvscsi
5: *
6: * Copyright (c) 2010,2011 Benjamin Herrenschmidt, IBM Corporation.
7: *
8: * Permission is hereby granted, free of charge, to any person obtaining a copy
9: * of this software and associated documentation files (the "Software"), to deal
10: * in the Software without restriction, including without limitation the rights
11: * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12: * copies of the Software, and to permit persons to whom the Software is
13: * furnished to do so, subject to the following conditions:
14: *
15: * The above copyright notice and this permission notice shall be included in
16: * all copies or substantial portions of the Software.
17: *
18: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20: * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21: * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23: * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24: * THE SOFTWARE.
25: *
26: * TODO:
27: *
28: * - Cleanups :-)
29: * - Sort out better how to assign devices to VSCSI instances
30: * - Fix residual counts
31: * - Add indirect descriptors support
32: * - Maybe do autosense (PAPR seems to mandate it, linux doesn't care)
33: */
34: #include "hw.h"
35: #include "scsi.h"
36: #include "scsi-defs.h"
37: #include "net.h" /* Remove that when we can */
38: #include "srp.h"
39: #include "hw/qdev.h"
40: #include "hw/spapr.h"
41: #include "hw/spapr_vio.h"
42: #include "hw/ppc-viosrp.h"
43:
44: #include <libfdt.h>
45:
46: /*#define DEBUG_VSCSI*/
47:
48: #ifdef DEBUG_VSCSI
49: #define dprintf(fmt, ...) \
50: do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
51: #else
52: #define dprintf(fmt, ...) \
53: do { } while (0)
54: #endif
55:
56: /*
57: * Virtual SCSI device
58: */
59:
60: /* Random numbers */
61: #define VSCSI_MAX_SECTORS 4096
62: #define VSCSI_REQ_LIMIT 24
63:
64: #define SCSI_SENSE_BUF_SIZE 96
65: #define SRP_RSP_SENSE_DATA_LEN 18
66:
67: typedef union vscsi_crq {
68: struct viosrp_crq s;
69: uint8_t raw[16];
70: } vscsi_crq;
71:
72: typedef struct vscsi_req {
73: vscsi_crq crq;
74: union viosrp_iu iu;
75:
76: /* SCSI request tracking */
77: SCSIRequest *sreq;
78: uint32_t qtag; /* qemu tag != srp tag */
79: int lun;
80: int active;
81: long data_len;
82: int writing;
83: int senselen;
84: uint8_t sense[SCSI_SENSE_BUF_SIZE];
85:
86: /* RDMA related bits */
87: uint8_t dma_fmt;
88: struct srp_direct_buf ext_desc;
89: struct srp_direct_buf *cur_desc;
90: struct srp_indirect_buf *ind_desc;
91: int local_desc;
92: int total_desc;
93: } vscsi_req;
94:
95:
96: typedef struct {
97: VIOsPAPRDevice vdev;
98: SCSIBus bus;
99: vscsi_req reqs[VSCSI_REQ_LIMIT];
100: } VSCSIState;
101:
102: static struct vscsi_req *vscsi_get_req(VSCSIState *s)
103: {
104: vscsi_req *req;
105: int i;
106:
107: for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
108: req = &s->reqs[i];
109: if (!req->active) {
110: memset(req, 0, sizeof(*req));
111: req->qtag = i;
112: req->active = 1;
113: return req;
114: }
115: }
116: return NULL;
117: }
118:
119: static void vscsi_put_req(vscsi_req *req)
120: {
121: if (req->sreq != NULL) {
122: scsi_req_unref(req->sreq);
123: }
124: req->sreq = NULL;
125: req->active = 0;
126: }
127:
1.1.1.2 root 128: static SCSIDevice *vscsi_device_find(SCSIBus *bus, uint64_t srp_lun, int *lun)
1.1 root 129: {
1.1.1.2 root 130: int channel = 0, id = 0;
131:
132: retry:
133: switch (srp_lun >> 62) {
134: case 0:
135: if ((srp_lun >> 56) != 0) {
136: channel = (srp_lun >> 56) & 0x3f;
137: id = (srp_lun >> 48) & 0xff;
138: srp_lun <<= 16;
139: goto retry;
140: }
141: *lun = (srp_lun >> 48) & 0xff;
142: break;
143:
144: case 1:
145: *lun = (srp_lun >> 48) & 0x3fff;
146: break;
147: case 2:
148: channel = (srp_lun >> 53) & 0x7;
149: id = (srp_lun >> 56) & 0x3f;
150: *lun = (srp_lun >> 48) & 0x1f;
151: break;
152: case 3:
153: *lun = -1;
154: return NULL;
155: default:
156: abort();
157: }
158:
159: return scsi_device_find(bus, channel, id, *lun);
1.1 root 160: }
161:
162: static int vscsi_send_iu(VSCSIState *s, vscsi_req *req,
163: uint64_t length, uint8_t format)
164: {
165: long rc, rc1;
166:
167: /* First copy the SRP */
168: rc = spapr_tce_dma_write(&s->vdev, req->crq.s.IU_data_ptr,
169: &req->iu, length);
170: if (rc) {
171: fprintf(stderr, "vscsi_send_iu: DMA write failure !\n");
172: }
173:
174: req->crq.s.valid = 0x80;
175: req->crq.s.format = format;
176: req->crq.s.reserved = 0x00;
177: req->crq.s.timeout = cpu_to_be16(0x0000);
178: req->crq.s.IU_length = cpu_to_be16(length);
179: req->crq.s.IU_data_ptr = req->iu.srp.rsp.tag; /* right byte order */
180:
181: if (rc == 0) {
182: req->crq.s.status = 0x99; /* Just needs to be non-zero */
183: } else {
184: req->crq.s.status = 0x00;
185: }
186:
187: rc1 = spapr_vio_send_crq(&s->vdev, req->crq.raw);
188: if (rc1) {
189: fprintf(stderr, "vscsi_send_iu: Error sending response\n");
190: return rc1;
191: }
192:
193: return rc;
194: }
195:
196: static void vscsi_makeup_sense(VSCSIState *s, vscsi_req *req,
197: uint8_t key, uint8_t asc, uint8_t ascq)
198: {
199: req->senselen = SRP_RSP_SENSE_DATA_LEN;
200:
201: /* Valid bit and 'current errors' */
202: req->sense[0] = (0x1 << 7 | 0x70);
203: /* Sense key */
204: req->sense[2] = key;
205: /* Additional sense length */
206: req->sense[7] = 0xa; /* 10 bytes */
207: /* Additional sense code */
208: req->sense[12] = asc;
209: req->sense[13] = ascq;
210: }
211:
212: static int vscsi_send_rsp(VSCSIState *s, vscsi_req *req,
213: uint8_t status, int32_t res_in, int32_t res_out)
214: {
215: union viosrp_iu *iu = &req->iu;
216: uint64_t tag = iu->srp.rsp.tag;
217: int total_len = sizeof(iu->srp.rsp);
218:
219: dprintf("VSCSI: Sending resp status: 0x%x, "
220: "res_in: %d, res_out: %d\n", status, res_in, res_out);
221:
222: memset(iu, 0, sizeof(struct srp_rsp));
223: iu->srp.rsp.opcode = SRP_RSP;
224: iu->srp.rsp.req_lim_delta = cpu_to_be32(1);
225: iu->srp.rsp.tag = tag;
226:
227: /* Handle residuals */
228: if (res_in < 0) {
229: iu->srp.rsp.flags |= SRP_RSP_FLAG_DIUNDER;
230: res_in = -res_in;
231: } else if (res_in) {
232: iu->srp.rsp.flags |= SRP_RSP_FLAG_DIOVER;
233: }
234: if (res_out < 0) {
235: iu->srp.rsp.flags |= SRP_RSP_FLAG_DOUNDER;
236: res_out = -res_out;
237: } else if (res_out) {
238: iu->srp.rsp.flags |= SRP_RSP_FLAG_DOOVER;
239: }
240: iu->srp.rsp.data_in_res_cnt = cpu_to_be32(res_in);
241: iu->srp.rsp.data_out_res_cnt = cpu_to_be32(res_out);
242:
243: /* We don't do response data */
244: /* iu->srp.rsp.flags &= ~SRP_RSP_FLAG_RSPVALID; */
245: iu->srp.rsp.resp_data_len = cpu_to_be32(0);
246:
247: /* Handle success vs. failure */
248: iu->srp.rsp.status = status;
249: if (status) {
250: iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x04) >> 2;
251: if (req->senselen) {
252: req->iu.srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
253: req->iu.srp.rsp.sense_data_len = cpu_to_be32(req->senselen);
254: memcpy(req->iu.srp.rsp.data, req->sense, req->senselen);
255: total_len += req->senselen;
256: }
257: } else {
258: iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x02) >> 1;
259: }
260:
261: vscsi_send_iu(s, req, total_len, VIOSRP_SRP_FORMAT);
262: return 0;
263: }
264:
265: static inline void vscsi_swap_desc(struct srp_direct_buf *desc)
266: {
267: desc->va = be64_to_cpu(desc->va);
268: desc->len = be32_to_cpu(desc->len);
269: }
270:
271: static int vscsi_srp_direct_data(VSCSIState *s, vscsi_req *req,
272: uint8_t *buf, uint32_t len)
273: {
274: struct srp_direct_buf *md = req->cur_desc;
275: uint32_t llen;
276: int rc = 0;
277:
278: dprintf("VSCSI: direct segment 0x%x bytes, va=0x%llx desc len=0x%x\n",
279: len, (unsigned long long)md->va, md->len);
280:
281: llen = MIN(len, md->len);
282: if (llen) {
283: if (req->writing) { /* writing = to device = reading from memory */
284: rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen);
285: } else {
286: rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen);
287: }
288: }
289: md->len -= llen;
290: md->va += llen;
291:
292: if (rc) {
293: return -1;
294: }
295: return llen;
296: }
297:
298: static int vscsi_srp_indirect_data(VSCSIState *s, vscsi_req *req,
299: uint8_t *buf, uint32_t len)
300: {
301: struct srp_direct_buf *td = &req->ind_desc->table_desc;
302: struct srp_direct_buf *md = req->cur_desc;
303: int rc = 0;
304: uint32_t llen, total = 0;
305:
306: dprintf("VSCSI: indirect segment 0x%x bytes, td va=0x%llx len=0x%x\n",
307: len, (unsigned long long)td->va, td->len);
308:
309: /* While we have data ... */
310: while (len) {
311: /* If we have a descriptor but it's empty, go fetch a new one */
312: if (md && md->len == 0) {
313: /* More local available, use one */
314: if (req->local_desc) {
315: md = ++req->cur_desc;
316: --req->local_desc;
317: --req->total_desc;
318: td->va += sizeof(struct srp_direct_buf);
319: } else {
320: md = req->cur_desc = NULL;
321: }
322: }
323: /* No descriptor at hand, fetch one */
324: if (!md) {
325: if (!req->total_desc) {
326: dprintf("VSCSI: Out of descriptors !\n");
327: break;
328: }
329: md = req->cur_desc = &req->ext_desc;
330: dprintf("VSCSI: Reading desc from 0x%llx\n",
331: (unsigned long long)td->va);
332: rc = spapr_tce_dma_read(&s->vdev, td->va, md,
333: sizeof(struct srp_direct_buf));
334: if (rc) {
335: dprintf("VSCSI: tce_dma_read -> %d reading ext_desc\n", rc);
336: break;
337: }
338: vscsi_swap_desc(md);
339: td->va += sizeof(struct srp_direct_buf);
340: --req->total_desc;
341: }
342: dprintf("VSCSI: [desc va=0x%llx,len=0x%x] remaining=0x%x\n",
343: (unsigned long long)md->va, md->len, len);
344:
345: /* Perform transfer */
346: llen = MIN(len, md->len);
347: if (req->writing) { /* writing = to device = reading from memory */
348: rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen);
349: } else {
350: rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen);
351: }
352: if (rc) {
353: dprintf("VSCSI: tce_dma_r/w(%d) -> %d\n", req->writing, rc);
354: break;
355: }
356: dprintf("VSCSI: data: %02x %02x %02x %02x...\n",
357: buf[0], buf[1], buf[2], buf[3]);
358:
359: len -= llen;
360: buf += llen;
361: total += llen;
362: md->va += llen;
363: md->len -= llen;
364: }
365: return rc ? -1 : total;
366: }
367:
368: static int vscsi_srp_transfer_data(VSCSIState *s, vscsi_req *req,
369: int writing, uint8_t *buf, uint32_t len)
370: {
371: int err = 0;
372:
373: switch (req->dma_fmt) {
374: case SRP_NO_DATA_DESC:
375: dprintf("VSCSI: no data desc transfer, skipping 0x%x bytes\n", len);
376: break;
377: case SRP_DATA_DESC_DIRECT:
378: err = vscsi_srp_direct_data(s, req, buf, len);
379: break;
380: case SRP_DATA_DESC_INDIRECT:
381: err = vscsi_srp_indirect_data(s, req, buf, len);
382: break;
383: }
384: return err;
385: }
386:
387: /* Bits from linux srp */
388: static int data_out_desc_size(struct srp_cmd *cmd)
389: {
390: int size = 0;
391: uint8_t fmt = cmd->buf_fmt >> 4;
392:
393: switch (fmt) {
394: case SRP_NO_DATA_DESC:
395: break;
396: case SRP_DATA_DESC_DIRECT:
397: size = sizeof(struct srp_direct_buf);
398: break;
399: case SRP_DATA_DESC_INDIRECT:
400: size = sizeof(struct srp_indirect_buf) +
401: sizeof(struct srp_direct_buf)*cmd->data_out_desc_cnt;
402: break;
403: default:
404: break;
405: }
406: return size;
407: }
408:
409: static int vscsi_preprocess_desc(vscsi_req *req)
410: {
411: struct srp_cmd *cmd = &req->iu.srp.cmd;
412: int offset, i;
413:
414: offset = cmd->add_cdb_len & ~3;
415:
416: if (req->writing) {
417: req->dma_fmt = cmd->buf_fmt >> 4;
418: } else {
419: offset += data_out_desc_size(cmd);
420: req->dma_fmt = cmd->buf_fmt & ((1U << 4) - 1);
421: }
422:
423: switch (req->dma_fmt) {
424: case SRP_NO_DATA_DESC:
425: break;
426: case SRP_DATA_DESC_DIRECT:
427: req->cur_desc = (struct srp_direct_buf *)(cmd->add_data + offset);
428: req->total_desc = req->local_desc = 1;
429: vscsi_swap_desc(req->cur_desc);
430: dprintf("VSCSI: using direct RDMA %s, 0x%x bytes MD: 0x%llx\n",
431: req->writing ? "write" : "read",
432: req->cur_desc->len, (unsigned long long)req->cur_desc->va);
433: break;
434: case SRP_DATA_DESC_INDIRECT:
435: req->ind_desc = (struct srp_indirect_buf *)(cmd->add_data + offset);
436: vscsi_swap_desc(&req->ind_desc->table_desc);
437: req->total_desc = req->ind_desc->table_desc.len /
438: sizeof(struct srp_direct_buf);
439: req->local_desc = req->writing ? cmd->data_out_desc_cnt :
440: cmd->data_in_desc_cnt;
441: for (i = 0; i < req->local_desc; i++) {
442: vscsi_swap_desc(&req->ind_desc->desc_list[i]);
443: }
444: req->cur_desc = req->local_desc ? &req->ind_desc->desc_list[0] : NULL;
445: dprintf("VSCSI: using indirect RDMA %s, 0x%x bytes %d descs "
446: "(%d local) VA: 0x%llx\n",
447: req->writing ? "read" : "write",
448: be32_to_cpu(req->ind_desc->len),
449: req->total_desc, req->local_desc,
450: (unsigned long long)req->ind_desc->table_desc.va);
451: break;
452: default:
453: fprintf(stderr,
454: "vscsi_preprocess_desc: Unknown format %x\n", req->dma_fmt);
455: return -1;
456: }
457:
458: return 0;
459: }
460:
461: /* Callback to indicate that the SCSI layer has completed a transfer. */
462: static void vscsi_transfer_data(SCSIRequest *sreq, uint32_t len)
463: {
464: VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent);
465: vscsi_req *req = sreq->hba_private;
466: uint8_t *buf;
467: int rc = 0;
468:
469: dprintf("VSCSI: SCSI xfer complete tag=0x%x len=0x%x, req=%p\n",
470: sreq->tag, len, req);
471: if (req == NULL) {
472: fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
473: return;
474: }
475:
476: if (len) {
477: buf = scsi_req_get_buf(sreq);
478: rc = vscsi_srp_transfer_data(s, req, req->writing, buf, len);
479: }
480: if (rc < 0) {
481: fprintf(stderr, "VSCSI: RDMA error rc=%d!\n", rc);
482: vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
483: scsi_req_abort(req->sreq, CHECK_CONDITION);
484: return;
485: }
486:
487: /* Start next chunk */
488: req->data_len -= rc;
489: scsi_req_continue(sreq);
490: }
491:
492: /* Callback to indicate that the SCSI layer has completed a transfer. */
1.1.1.3 ! root 493: static void vscsi_command_complete(SCSIRequest *sreq, uint32_t status, size_t resid)
1.1 root 494: {
495: VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent);
496: vscsi_req *req = sreq->hba_private;
497: int32_t res_in = 0, res_out = 0;
498:
499: dprintf("VSCSI: SCSI cmd complete, r=0x%x tag=0x%x status=0x%x, req=%p\n",
500: reason, sreq->tag, status, req);
501: if (req == NULL) {
502: fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
503: return;
504: }
505:
1.1.1.2 root 506: if (status == CHECK_CONDITION) {
507: req->senselen = scsi_req_get_sense(req->sreq, req->sense,
508: sizeof(req->sense));
509: dprintf("VSCSI: Sense data, %d bytes:\n", len);
510: dprintf(" %02x %02x %02x %02x %02x %02x %02x %02x\n",
511: req->sense[0], req->sense[1], req->sense[2], req->sense[3],
512: req->sense[4], req->sense[5], req->sense[6], req->sense[7]);
513: dprintf(" %02x %02x %02x %02x %02x %02x %02x %02x\n",
514: req->sense[8], req->sense[9], req->sense[10], req->sense[11],
515: req->sense[12], req->sense[13], req->sense[14], req->sense[15]);
1.1 root 516: }
517:
1.1.1.2 root 518: dprintf("VSCSI: Command complete err=%d\n", status);
519: if (status == 0) {
520: /* We handle overflows, not underflows for normal commands,
521: * but hopefully nobody cares
522: */
523: if (req->writing) {
524: res_out = req->data_len;
525: } else {
526: res_in = req->data_len;
1.1 root 527: }
528: }
1.1.1.2 root 529: vscsi_send_rsp(s, req, status, res_in, res_out);
1.1 root 530: vscsi_put_req(req);
531: }
532:
533: static void vscsi_request_cancelled(SCSIRequest *sreq)
534: {
535: vscsi_req *req = sreq->hba_private;
536:
537: vscsi_put_req(req);
538: }
539:
540: static void vscsi_process_login(VSCSIState *s, vscsi_req *req)
541: {
542: union viosrp_iu *iu = &req->iu;
543: struct srp_login_rsp *rsp = &iu->srp.login_rsp;
544: uint64_t tag = iu->srp.rsp.tag;
545:
546: dprintf("VSCSI: Got login, sendin response !\n");
547:
548: /* TODO handle case that requested size is wrong and
549: * buffer format is wrong
550: */
551: memset(iu, 0, sizeof(struct srp_login_rsp));
552: rsp->opcode = SRP_LOGIN_RSP;
553: /* Don't advertise quite as many request as we support to
554: * keep room for management stuff etc...
555: */
556: rsp->req_lim_delta = cpu_to_be32(VSCSI_REQ_LIMIT-2);
557: rsp->tag = tag;
558: rsp->max_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
559: rsp->max_ti_iu_len = cpu_to_be32(sizeof(union srp_iu));
560: /* direct and indirect */
561: rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT);
562:
563: vscsi_send_iu(s, req, sizeof(*rsp), VIOSRP_SRP_FORMAT);
564: }
565:
566: static void vscsi_inquiry_no_target(VSCSIState *s, vscsi_req *req)
567: {
568: uint8_t *cdb = req->iu.srp.cmd.cdb;
569: uint8_t resp_data[36];
570: int rc, len, alen;
571:
572: /* We dont do EVPD. Also check that page_code is 0 */
573: if ((cdb[1] & 0x01) || (cdb[1] & 0x01) || cdb[2] != 0) {
574: /* Send INVALID FIELD IN CDB */
575: vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0);
576: vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
577: return;
578: }
579: alen = cdb[3];
580: alen = (alen << 8) | cdb[4];
581: len = MIN(alen, 36);
582:
583: /* Fake up inquiry using PQ=3 */
584: memset(resp_data, 0, 36);
585: resp_data[0] = 0x7f; /* Not capable of supporting a device here */
586: resp_data[2] = 0x06; /* SPS-4 */
587: resp_data[3] = 0x02; /* Resp data format */
588: resp_data[4] = 36 - 5; /* Additional length */
589: resp_data[7] = 0x10; /* Sync transfers */
590: memcpy(&resp_data[16], "QEMU EMPTY ", 16);
591: memcpy(&resp_data[8], "QEMU ", 8);
592:
593: req->writing = 0;
594: vscsi_preprocess_desc(req);
595: rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len);
596: if (rc < 0) {
597: vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
598: vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
599: } else {
600: vscsi_send_rsp(s, req, 0, 36 - rc, 0);
601: }
602: }
603:
604: static int vscsi_queue_cmd(VSCSIState *s, vscsi_req *req)
605: {
606: union srp_iu *srp = &req->iu.srp;
607: SCSIDevice *sdev;
1.1.1.2 root 608: int n, lun;
1.1 root 609:
1.1.1.2 root 610: sdev = vscsi_device_find(&s->bus, be64_to_cpu(srp->cmd.lun), &lun);
1.1 root 611: if (!sdev) {
1.1.1.2 root 612: dprintf("VSCSI: Command for lun %08" PRIx64 " with no drive\n", be64_to_cpu(srp->cmd.lun));
1.1 root 613: if (srp->cmd.cdb[0] == INQUIRY) {
614: vscsi_inquiry_no_target(s, req);
615: } else {
616: vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0x00);
617: vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
618: } return 1;
619: }
620:
621: req->lun = lun;
1.1.1.2 root 622: req->sreq = scsi_req_new(sdev, req->qtag, lun, srp->cmd.cdb, req);
623: n = scsi_req_enqueue(req->sreq);
1.1 root 624:
625: dprintf("VSCSI: Queued command tag 0x%x CMD 0x%x ID %d LUN %d ret: %d\n",
626: req->qtag, srp->cmd.cdb[0], id, lun, n);
627:
628: if (n) {
629: /* Transfer direction must be set before preprocessing the
630: * descriptors
631: */
632: req->writing = (n < 1);
633:
634: /* Preprocess RDMA descriptors */
635: vscsi_preprocess_desc(req);
636:
637: /* Get transfer direction and initiate transfer */
638: if (n > 0) {
639: req->data_len = n;
640: } else if (n < 0) {
641: req->data_len = -n;
642: }
643: scsi_req_continue(req->sreq);
644: }
645: /* Don't touch req here, it may have been recycled already */
646:
647: return 0;
648: }
649:
650: static int vscsi_process_tsk_mgmt(VSCSIState *s, vscsi_req *req)
651: {
652: union viosrp_iu *iu = &req->iu;
653: int fn;
654:
655: fprintf(stderr, "vscsi_process_tsk_mgmt %02x\n",
656: iu->srp.tsk_mgmt.tsk_mgmt_func);
657:
658: switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
659: #if 0 /* We really don't deal with these for now */
660: case SRP_TSK_ABORT_TASK:
661: fn = ABORT_TASK;
662: break;
663: case SRP_TSK_ABORT_TASK_SET:
664: fn = ABORT_TASK_SET;
665: break;
666: case SRP_TSK_CLEAR_TASK_SET:
667: fn = CLEAR_TASK_SET;
668: break;
669: case SRP_TSK_LUN_RESET:
670: fn = LOGICAL_UNIT_RESET;
671: break;
672: case SRP_TSK_CLEAR_ACA:
673: fn = CLEAR_ACA;
674: break;
675: #endif
676: default:
677: fn = 0;
678: }
679: if (fn) {
680: /* XXX Send/Handle target task management */
681: ;
682: } else {
683: vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x20, 0);
684: vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
685: }
686: return !fn;
687: }
688:
689: static int vscsi_handle_srp_req(VSCSIState *s, vscsi_req *req)
690: {
691: union srp_iu *srp = &req->iu.srp;
692: int done = 1;
693: uint8_t opcode = srp->rsp.opcode;
694:
695: switch (opcode) {
696: case SRP_LOGIN_REQ:
697: vscsi_process_login(s, req);
698: break;
699: case SRP_TSK_MGMT:
700: done = vscsi_process_tsk_mgmt(s, req);
701: break;
702: case SRP_CMD:
703: done = vscsi_queue_cmd(s, req);
704: break;
705: case SRP_LOGIN_RSP:
706: case SRP_I_LOGOUT:
707: case SRP_T_LOGOUT:
708: case SRP_RSP:
709: case SRP_CRED_REQ:
710: case SRP_CRED_RSP:
711: case SRP_AER_REQ:
712: case SRP_AER_RSP:
713: fprintf(stderr, "VSCSI: Unsupported opcode %02x\n", opcode);
714: break;
715: default:
716: fprintf(stderr, "VSCSI: Unknown type %02x\n", opcode);
717: }
718:
719: return done;
720: }
721:
722: static int vscsi_send_adapter_info(VSCSIState *s, vscsi_req *req)
723: {
724: struct viosrp_adapter_info *sinfo;
725: struct mad_adapter_info_data info;
726: int rc;
727:
728: sinfo = &req->iu.mad.adapter_info;
729:
730: #if 0 /* What for ? */
731: rc = spapr_tce_dma_read(&s->vdev, be64_to_cpu(sinfo->buffer),
732: &info, be16_to_cpu(sinfo->common.length));
733: if (rc) {
734: fprintf(stderr, "vscsi_send_adapter_info: DMA read failure !\n");
735: }
736: #endif
737: memset(&info, 0, sizeof(info));
738: strcpy(info.srp_version, SRP_VERSION);
739: strncpy(info.partition_name, "qemu", sizeof("qemu"));
740: info.partition_number = cpu_to_be32(0);
741: info.mad_version = cpu_to_be32(1);
742: info.os_type = cpu_to_be32(2);
743: info.port_max_txu[0] = cpu_to_be32(VSCSI_MAX_SECTORS << 9);
744:
745: rc = spapr_tce_dma_write(&s->vdev, be64_to_cpu(sinfo->buffer),
746: &info, be16_to_cpu(sinfo->common.length));
747: if (rc) {
748: fprintf(stderr, "vscsi_send_adapter_info: DMA write failure !\n");
749: }
750:
751: sinfo->common.status = rc ? cpu_to_be32(1) : 0;
752:
753: return vscsi_send_iu(s, req, sizeof(*sinfo), VIOSRP_MAD_FORMAT);
754: }
755:
756: static int vscsi_handle_mad_req(VSCSIState *s, vscsi_req *req)
757: {
758: union mad_iu *mad = &req->iu.mad;
759:
760: switch (be32_to_cpu(mad->empty_iu.common.type)) {
761: case VIOSRP_EMPTY_IU_TYPE:
762: fprintf(stderr, "Unsupported EMPTY MAD IU\n");
763: break;
764: case VIOSRP_ERROR_LOG_TYPE:
765: fprintf(stderr, "Unsupported ERROR LOG MAD IU\n");
766: mad->error_log.common.status = cpu_to_be16(1);
767: vscsi_send_iu(s, req, sizeof(mad->error_log), VIOSRP_MAD_FORMAT);
768: break;
769: case VIOSRP_ADAPTER_INFO_TYPE:
770: vscsi_send_adapter_info(s, req);
771: break;
772: case VIOSRP_HOST_CONFIG_TYPE:
773: mad->host_config.common.status = cpu_to_be16(1);
774: vscsi_send_iu(s, req, sizeof(mad->host_config), VIOSRP_MAD_FORMAT);
775: break;
776: default:
777: fprintf(stderr, "VSCSI: Unknown MAD type %02x\n",
778: be32_to_cpu(mad->empty_iu.common.type));
779: }
780:
781: return 1;
782: }
783:
784: static void vscsi_got_payload(VSCSIState *s, vscsi_crq *crq)
785: {
786: vscsi_req *req;
787: int done;
788:
789: req = vscsi_get_req(s);
790: if (req == NULL) {
791: fprintf(stderr, "VSCSI: Failed to get a request !\n");
792: return;
793: }
794:
795: /* We only support a limited number of descriptors, we know
796: * the ibmvscsi driver uses up to 10 max, so it should fit
797: * in our 256 bytes IUs. If not we'll have to increase the size
798: * of the structure.
799: */
800: if (crq->s.IU_length > sizeof(union viosrp_iu)) {
801: fprintf(stderr, "VSCSI: SRP IU too long (%d bytes) !\n",
802: crq->s.IU_length);
803: return;
804: }
805:
806: /* XXX Handle failure differently ? */
807: if (spapr_tce_dma_read(&s->vdev, crq->s.IU_data_ptr, &req->iu,
808: crq->s.IU_length)) {
809: fprintf(stderr, "vscsi_got_payload: DMA read failure !\n");
1.1.1.2 root 810: g_free(req);
1.1 root 811: }
812: memcpy(&req->crq, crq, sizeof(vscsi_crq));
813:
814: if (crq->s.format == VIOSRP_MAD_FORMAT) {
815: done = vscsi_handle_mad_req(s, req);
816: } else {
817: done = vscsi_handle_srp_req(s, req);
818: }
819:
820: if (done) {
821: vscsi_put_req(req);
822: }
823: }
824:
825:
826: static int vscsi_do_crq(struct VIOsPAPRDevice *dev, uint8_t *crq_data)
827: {
828: VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
829: vscsi_crq crq;
830:
831: memcpy(crq.raw, crq_data, 16);
832: crq.s.timeout = be16_to_cpu(crq.s.timeout);
833: crq.s.IU_length = be16_to_cpu(crq.s.IU_length);
834: crq.s.IU_data_ptr = be64_to_cpu(crq.s.IU_data_ptr);
835:
836: dprintf("VSCSI: do_crq %02x %02x ...\n", crq.raw[0], crq.raw[1]);
837:
838: switch (crq.s.valid) {
839: case 0xc0: /* Init command/response */
840:
841: /* Respond to initialization request */
842: if (crq.s.format == 0x01) {
843: memset(crq.raw, 0, 16);
844: crq.s.valid = 0xc0;
845: crq.s.format = 0x02;
846: spapr_vio_send_crq(dev, crq.raw);
847: }
848:
849: /* Note that in hotplug cases, we might get a 0x02
850: * as a result of us emitting the init request
851: */
852:
853: break;
854: case 0xff: /* Link event */
855:
856: /* Not handled for now */
857:
858: break;
859: case 0x80: /* Payloads */
860: switch (crq.s.format) {
861: case VIOSRP_SRP_FORMAT: /* AKA VSCSI request */
862: case VIOSRP_MAD_FORMAT: /* AKA VSCSI response */
863: vscsi_got_payload(s, &crq);
864: break;
865: case VIOSRP_OS400_FORMAT:
866: case VIOSRP_AIX_FORMAT:
867: case VIOSRP_LINUX_FORMAT:
868: case VIOSRP_INLINE_FORMAT:
869: fprintf(stderr, "vscsi_do_srq: Unsupported payload format %02x\n",
870: crq.s.format);
871: break;
872: default:
873: fprintf(stderr, "vscsi_do_srq: Unknown payload format %02x\n",
874: crq.s.format);
875: }
876: break;
877: default:
878: fprintf(stderr, "vscsi_do_crq: unknown CRQ %02x %02x ...\n",
879: crq.raw[0], crq.raw[1]);
880: };
881:
882: return 0;
883: }
884:
1.1.1.2 root 885: static const struct SCSIBusInfo vscsi_scsi_info = {
886: .tcq = true,
887: .max_channel = 7, /* logical unit addressing format */
888: .max_target = 63,
889: .max_lun = 31,
890:
1.1 root 891: .transfer_data = vscsi_transfer_data,
892: .complete = vscsi_command_complete,
893: .cancel = vscsi_request_cancelled
894: };
895:
1.1.1.3 ! root 896: static void spapr_vscsi_reset(VIOsPAPRDevice *dev)
1.1 root 897: {
898: VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
899: int i;
900:
901: memset(s->reqs, 0, sizeof(s->reqs));
902: for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
903: s->reqs[i].qtag = i;
904: }
1.1.1.3 ! root 905: }
! 906:
! 907: static int spapr_vscsi_init(VIOsPAPRDevice *dev)
! 908: {
! 909: VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
1.1 root 910:
911: dev->crq.SendFunc = vscsi_do_crq;
912:
1.1.1.2 root 913: scsi_bus_new(&s->bus, &dev->qdev, &vscsi_scsi_info);
1.1 root 914: if (!dev->qdev.hotplugged) {
915: scsi_bus_legacy_handle_cmdline(&s->bus);
916: }
917:
918: return 0;
919: }
920:
1.1.1.3 ! root 921: void spapr_vscsi_create(VIOsPAPRBus *bus)
1.1 root 922: {
923: DeviceState *dev;
924:
925: dev = qdev_create(&bus->bus, "spapr-vscsi");
926:
927: qdev_init_nofail(dev);
928: }
929:
930: static int spapr_vscsi_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
931: {
932: int ret;
933:
934: ret = fdt_setprop_cell(fdt, node_off, "#address-cells", 2);
935: if (ret < 0) {
936: return ret;
937: }
938:
939: ret = fdt_setprop_cell(fdt, node_off, "#size-cells", 0);
940: if (ret < 0) {
941: return ret;
942: }
943:
944: return 0;
945: }
946:
1.1.1.3 ! root 947: static Property spapr_vscsi_properties[] = {
! 948: DEFINE_SPAPR_PROPERTIES(VSCSIState, vdev, 0x10000000),
! 949: DEFINE_PROP_END_OF_LIST(),
1.1 root 950: };
951:
1.1.1.3 ! root 952: static void spapr_vscsi_class_init(ObjectClass *klass, void *data)
1.1 root 953: {
1.1.1.3 ! root 954: DeviceClass *dc = DEVICE_CLASS(klass);
! 955: VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
! 956:
! 957: k->init = spapr_vscsi_init;
! 958: k->reset = spapr_vscsi_reset;
! 959: k->devnode = spapr_vscsi_devnode;
! 960: k->dt_name = "v-scsi";
! 961: k->dt_type = "vscsi";
! 962: k->dt_compatible = "IBM,v-scsi";
! 963: k->signal_mask = 0x00000001;
! 964: dc->props = spapr_vscsi_properties;
! 965: }
! 966:
! 967: static TypeInfo spapr_vscsi_info = {
! 968: .name = "spapr-vscsi",
! 969: .parent = TYPE_VIO_SPAPR_DEVICE,
! 970: .instance_size = sizeof(VSCSIState),
! 971: .class_init = spapr_vscsi_class_init,
! 972: };
! 973:
! 974: static void spapr_vscsi_register_types(void)
! 975: {
! 976: type_register_static(&spapr_vscsi_info);
1.1 root 977: }
1.1.1.3 ! root 978:
! 979: type_init(spapr_vscsi_register_types)
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