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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 sensing;
84: int senselen;
85: uint8_t sense[SCSI_SENSE_BUF_SIZE];
86:
87: /* RDMA related bits */
88: uint8_t dma_fmt;
89: struct srp_direct_buf ext_desc;
90: struct srp_direct_buf *cur_desc;
91: struct srp_indirect_buf *ind_desc;
92: int local_desc;
93: int total_desc;
94: } vscsi_req;
95:
96:
97: typedef struct {
98: VIOsPAPRDevice vdev;
99: SCSIBus bus;
100: vscsi_req reqs[VSCSI_REQ_LIMIT];
101: } VSCSIState;
102:
103: /* XXX Debug only */
104: static VSCSIState *dbg_vscsi_state;
105:
106:
107: static struct vscsi_req *vscsi_get_req(VSCSIState *s)
108: {
109: vscsi_req *req;
110: int i;
111:
112: for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
113: req = &s->reqs[i];
114: if (!req->active) {
115: memset(req, 0, sizeof(*req));
116: req->qtag = i;
117: req->active = 1;
118: return req;
119: }
120: }
121: return NULL;
122: }
123:
124: static void vscsi_put_req(vscsi_req *req)
125: {
126: if (req->sreq != NULL) {
127: scsi_req_unref(req->sreq);
128: }
129: req->sreq = NULL;
130: req->active = 0;
131: }
132:
133: static void vscsi_decode_id_lun(uint64_t srp_lun, int *id, int *lun)
134: {
135: /* XXX Figure that one out properly ! This is crackpot */
136: *id = (srp_lun >> 56) & 0x7f;
137: *lun = (srp_lun >> 48) & 0xff;
138: }
139:
140: static int vscsi_send_iu(VSCSIState *s, vscsi_req *req,
141: uint64_t length, uint8_t format)
142: {
143: long rc, rc1;
144:
145: /* First copy the SRP */
146: rc = spapr_tce_dma_write(&s->vdev, req->crq.s.IU_data_ptr,
147: &req->iu, length);
148: if (rc) {
149: fprintf(stderr, "vscsi_send_iu: DMA write failure !\n");
150: }
151:
152: req->crq.s.valid = 0x80;
153: req->crq.s.format = format;
154: req->crq.s.reserved = 0x00;
155: req->crq.s.timeout = cpu_to_be16(0x0000);
156: req->crq.s.IU_length = cpu_to_be16(length);
157: req->crq.s.IU_data_ptr = req->iu.srp.rsp.tag; /* right byte order */
158:
159: if (rc == 0) {
160: req->crq.s.status = 0x99; /* Just needs to be non-zero */
161: } else {
162: req->crq.s.status = 0x00;
163: }
164:
165: rc1 = spapr_vio_send_crq(&s->vdev, req->crq.raw);
166: if (rc1) {
167: fprintf(stderr, "vscsi_send_iu: Error sending response\n");
168: return rc1;
169: }
170:
171: return rc;
172: }
173:
174: static void vscsi_makeup_sense(VSCSIState *s, vscsi_req *req,
175: uint8_t key, uint8_t asc, uint8_t ascq)
176: {
177: req->senselen = SRP_RSP_SENSE_DATA_LEN;
178:
179: /* Valid bit and 'current errors' */
180: req->sense[0] = (0x1 << 7 | 0x70);
181: /* Sense key */
182: req->sense[2] = key;
183: /* Additional sense length */
184: req->sense[7] = 0xa; /* 10 bytes */
185: /* Additional sense code */
186: req->sense[12] = asc;
187: req->sense[13] = ascq;
188: }
189:
190: static int vscsi_send_rsp(VSCSIState *s, vscsi_req *req,
191: uint8_t status, int32_t res_in, int32_t res_out)
192: {
193: union viosrp_iu *iu = &req->iu;
194: uint64_t tag = iu->srp.rsp.tag;
195: int total_len = sizeof(iu->srp.rsp);
196:
197: dprintf("VSCSI: Sending resp status: 0x%x, "
198: "res_in: %d, res_out: %d\n", status, res_in, res_out);
199:
200: memset(iu, 0, sizeof(struct srp_rsp));
201: iu->srp.rsp.opcode = SRP_RSP;
202: iu->srp.rsp.req_lim_delta = cpu_to_be32(1);
203: iu->srp.rsp.tag = tag;
204:
205: /* Handle residuals */
206: if (res_in < 0) {
207: iu->srp.rsp.flags |= SRP_RSP_FLAG_DIUNDER;
208: res_in = -res_in;
209: } else if (res_in) {
210: iu->srp.rsp.flags |= SRP_RSP_FLAG_DIOVER;
211: }
212: if (res_out < 0) {
213: iu->srp.rsp.flags |= SRP_RSP_FLAG_DOUNDER;
214: res_out = -res_out;
215: } else if (res_out) {
216: iu->srp.rsp.flags |= SRP_RSP_FLAG_DOOVER;
217: }
218: iu->srp.rsp.data_in_res_cnt = cpu_to_be32(res_in);
219: iu->srp.rsp.data_out_res_cnt = cpu_to_be32(res_out);
220:
221: /* We don't do response data */
222: /* iu->srp.rsp.flags &= ~SRP_RSP_FLAG_RSPVALID; */
223: iu->srp.rsp.resp_data_len = cpu_to_be32(0);
224:
225: /* Handle success vs. failure */
226: iu->srp.rsp.status = status;
227: if (status) {
228: iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x04) >> 2;
229: if (req->senselen) {
230: req->iu.srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
231: req->iu.srp.rsp.sense_data_len = cpu_to_be32(req->senselen);
232: memcpy(req->iu.srp.rsp.data, req->sense, req->senselen);
233: total_len += req->senselen;
234: }
235: } else {
236: iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x02) >> 1;
237: }
238:
239: vscsi_send_iu(s, req, total_len, VIOSRP_SRP_FORMAT);
240: return 0;
241: }
242:
243: static inline void vscsi_swap_desc(struct srp_direct_buf *desc)
244: {
245: desc->va = be64_to_cpu(desc->va);
246: desc->len = be32_to_cpu(desc->len);
247: }
248:
249: static int vscsi_srp_direct_data(VSCSIState *s, vscsi_req *req,
250: uint8_t *buf, uint32_t len)
251: {
252: struct srp_direct_buf *md = req->cur_desc;
253: uint32_t llen;
254: int rc = 0;
255:
256: dprintf("VSCSI: direct segment 0x%x bytes, va=0x%llx desc len=0x%x\n",
257: len, (unsigned long long)md->va, md->len);
258:
259: llen = MIN(len, md->len);
260: if (llen) {
261: if (req->writing) { /* writing = to device = reading from memory */
262: rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen);
263: } else {
264: rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen);
265: }
266: }
267: md->len -= llen;
268: md->va += llen;
269:
270: if (rc) {
271: return -1;
272: }
273: return llen;
274: }
275:
276: static int vscsi_srp_indirect_data(VSCSIState *s, vscsi_req *req,
277: uint8_t *buf, uint32_t len)
278: {
279: struct srp_direct_buf *td = &req->ind_desc->table_desc;
280: struct srp_direct_buf *md = req->cur_desc;
281: int rc = 0;
282: uint32_t llen, total = 0;
283:
284: dprintf("VSCSI: indirect segment 0x%x bytes, td va=0x%llx len=0x%x\n",
285: len, (unsigned long long)td->va, td->len);
286:
287: /* While we have data ... */
288: while (len) {
289: /* If we have a descriptor but it's empty, go fetch a new one */
290: if (md && md->len == 0) {
291: /* More local available, use one */
292: if (req->local_desc) {
293: md = ++req->cur_desc;
294: --req->local_desc;
295: --req->total_desc;
296: td->va += sizeof(struct srp_direct_buf);
297: } else {
298: md = req->cur_desc = NULL;
299: }
300: }
301: /* No descriptor at hand, fetch one */
302: if (!md) {
303: if (!req->total_desc) {
304: dprintf("VSCSI: Out of descriptors !\n");
305: break;
306: }
307: md = req->cur_desc = &req->ext_desc;
308: dprintf("VSCSI: Reading desc from 0x%llx\n",
309: (unsigned long long)td->va);
310: rc = spapr_tce_dma_read(&s->vdev, td->va, md,
311: sizeof(struct srp_direct_buf));
312: if (rc) {
313: dprintf("VSCSI: tce_dma_read -> %d reading ext_desc\n", rc);
314: break;
315: }
316: vscsi_swap_desc(md);
317: td->va += sizeof(struct srp_direct_buf);
318: --req->total_desc;
319: }
320: dprintf("VSCSI: [desc va=0x%llx,len=0x%x] remaining=0x%x\n",
321: (unsigned long long)md->va, md->len, len);
322:
323: /* Perform transfer */
324: llen = MIN(len, md->len);
325: if (req->writing) { /* writing = to device = reading from memory */
326: rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen);
327: } else {
328: rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen);
329: }
330: if (rc) {
331: dprintf("VSCSI: tce_dma_r/w(%d) -> %d\n", req->writing, rc);
332: break;
333: }
334: dprintf("VSCSI: data: %02x %02x %02x %02x...\n",
335: buf[0], buf[1], buf[2], buf[3]);
336:
337: len -= llen;
338: buf += llen;
339: total += llen;
340: md->va += llen;
341: md->len -= llen;
342: }
343: return rc ? -1 : total;
344: }
345:
346: static int vscsi_srp_transfer_data(VSCSIState *s, vscsi_req *req,
347: int writing, uint8_t *buf, uint32_t len)
348: {
349: int err = 0;
350:
351: switch (req->dma_fmt) {
352: case SRP_NO_DATA_DESC:
353: dprintf("VSCSI: no data desc transfer, skipping 0x%x bytes\n", len);
354: break;
355: case SRP_DATA_DESC_DIRECT:
356: err = vscsi_srp_direct_data(s, req, buf, len);
357: break;
358: case SRP_DATA_DESC_INDIRECT:
359: err = vscsi_srp_indirect_data(s, req, buf, len);
360: break;
361: }
362: return err;
363: }
364:
365: /* Bits from linux srp */
366: static int data_out_desc_size(struct srp_cmd *cmd)
367: {
368: int size = 0;
369: uint8_t fmt = cmd->buf_fmt >> 4;
370:
371: switch (fmt) {
372: case SRP_NO_DATA_DESC:
373: break;
374: case SRP_DATA_DESC_DIRECT:
375: size = sizeof(struct srp_direct_buf);
376: break;
377: case SRP_DATA_DESC_INDIRECT:
378: size = sizeof(struct srp_indirect_buf) +
379: sizeof(struct srp_direct_buf)*cmd->data_out_desc_cnt;
380: break;
381: default:
382: break;
383: }
384: return size;
385: }
386:
387: static int vscsi_preprocess_desc(vscsi_req *req)
388: {
389: struct srp_cmd *cmd = &req->iu.srp.cmd;
390: int offset, i;
391:
392: offset = cmd->add_cdb_len & ~3;
393:
394: if (req->writing) {
395: req->dma_fmt = cmd->buf_fmt >> 4;
396: } else {
397: offset += data_out_desc_size(cmd);
398: req->dma_fmt = cmd->buf_fmt & ((1U << 4) - 1);
399: }
400:
401: switch (req->dma_fmt) {
402: case SRP_NO_DATA_DESC:
403: break;
404: case SRP_DATA_DESC_DIRECT:
405: req->cur_desc = (struct srp_direct_buf *)(cmd->add_data + offset);
406: req->total_desc = req->local_desc = 1;
407: vscsi_swap_desc(req->cur_desc);
408: dprintf("VSCSI: using direct RDMA %s, 0x%x bytes MD: 0x%llx\n",
409: req->writing ? "write" : "read",
410: req->cur_desc->len, (unsigned long long)req->cur_desc->va);
411: break;
412: case SRP_DATA_DESC_INDIRECT:
413: req->ind_desc = (struct srp_indirect_buf *)(cmd->add_data + offset);
414: vscsi_swap_desc(&req->ind_desc->table_desc);
415: req->total_desc = req->ind_desc->table_desc.len /
416: sizeof(struct srp_direct_buf);
417: req->local_desc = req->writing ? cmd->data_out_desc_cnt :
418: cmd->data_in_desc_cnt;
419: for (i = 0; i < req->local_desc; i++) {
420: vscsi_swap_desc(&req->ind_desc->desc_list[i]);
421: }
422: req->cur_desc = req->local_desc ? &req->ind_desc->desc_list[0] : NULL;
423: dprintf("VSCSI: using indirect RDMA %s, 0x%x bytes %d descs "
424: "(%d local) VA: 0x%llx\n",
425: req->writing ? "read" : "write",
426: be32_to_cpu(req->ind_desc->len),
427: req->total_desc, req->local_desc,
428: (unsigned long long)req->ind_desc->table_desc.va);
429: break;
430: default:
431: fprintf(stderr,
432: "vscsi_preprocess_desc: Unknown format %x\n", req->dma_fmt);
433: return -1;
434: }
435:
436: return 0;
437: }
438:
439: static void vscsi_send_request_sense(VSCSIState *s, vscsi_req *req)
440: {
441: uint8_t *cdb = req->iu.srp.cmd.cdb;
442: int n;
443:
444: n = scsi_req_get_sense(req->sreq, req->sense, sizeof(req->sense));
445: if (n) {
446: req->senselen = n;
447: vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
448: vscsi_put_req(req);
449: return;
450: }
451:
452: dprintf("VSCSI: Got CHECK_CONDITION, requesting sense...\n");
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_transfer_data(SCSIRequest *sreq, uint32_t len)
475: {
476: VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent);
477: vscsi_req *req = sreq->hba_private;
478: uint8_t *buf;
479: int rc = 0;
480:
481: dprintf("VSCSI: SCSI xfer complete tag=0x%x len=0x%x, req=%p\n",
482: sreq->tag, len, req);
483: if (req == NULL) {
484: fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
485: return;
486: }
487:
488: if (req->sensing) {
489: uint8_t *buf = scsi_req_get_buf(sreq);
490:
491: len = MIN(len, SCSI_SENSE_BUF_SIZE);
492: dprintf("VSCSI: Sense data, %d bytes:\n", len);
493: dprintf(" %02x %02x %02x %02x %02x %02x %02x %02x\n",
494: buf[0], buf[1], buf[2], buf[3],
495: buf[4], buf[5], buf[6], buf[7]);
496: dprintf(" %02x %02x %02x %02x %02x %02x %02x %02x\n",
497: buf[8], buf[9], buf[10], buf[11],
498: buf[12], buf[13], buf[14], buf[15]);
499: memcpy(req->sense, buf, len);
500: req->senselen = len;
501: scsi_req_continue(req->sreq);
502: return;
503: }
504:
505: if (len) {
506: buf = scsi_req_get_buf(sreq);
507: rc = vscsi_srp_transfer_data(s, req, req->writing, buf, len);
508: }
509: if (rc < 0) {
510: fprintf(stderr, "VSCSI: RDMA error rc=%d!\n", rc);
511: vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
512: scsi_req_abort(req->sreq, CHECK_CONDITION);
513: return;
514: }
515:
516: /* Start next chunk */
517: req->data_len -= rc;
518: scsi_req_continue(sreq);
519: }
520:
521: /* Callback to indicate that the SCSI layer has completed a transfer. */
522: static void vscsi_command_complete(SCSIRequest *sreq, uint32_t status)
523: {
524: VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent);
525: vscsi_req *req = sreq->hba_private;
526: int32_t res_in = 0, res_out = 0;
527:
528: dprintf("VSCSI: SCSI cmd complete, r=0x%x tag=0x%x status=0x%x, req=%p\n",
529: reason, sreq->tag, status, req);
530: if (req == NULL) {
531: fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
532: return;
533: }
534:
535: if (!req->sensing && status == CHECK_CONDITION) {
536: vscsi_send_request_sense(s, req);
537: return;
538: }
539:
540: if (req->sensing) {
541: dprintf("VSCSI: Sense done !\n");
542: status = CHECK_CONDITION;
543: } else {
544: dprintf("VSCSI: Command complete err=%d\n", status);
545: if (status == 0) {
546: /* We handle overflows, not underflows for normal commands,
547: * but hopefully nobody cares
548: */
549: if (req->writing) {
550: res_out = req->data_len;
551: } else {
552: res_in = req->data_len;
553: }
554: }
555: }
556: vscsi_send_rsp(s, req, 0, res_in, res_out);
557: vscsi_put_req(req);
558: }
559:
560: static void vscsi_request_cancelled(SCSIRequest *sreq)
561: {
562: vscsi_req *req = sreq->hba_private;
563:
564: vscsi_put_req(req);
565: }
566:
567: static void vscsi_process_login(VSCSIState *s, vscsi_req *req)
568: {
569: union viosrp_iu *iu = &req->iu;
570: struct srp_login_rsp *rsp = &iu->srp.login_rsp;
571: uint64_t tag = iu->srp.rsp.tag;
572:
573: dprintf("VSCSI: Got login, sendin response !\n");
574:
575: /* TODO handle case that requested size is wrong and
576: * buffer format is wrong
577: */
578: memset(iu, 0, sizeof(struct srp_login_rsp));
579: rsp->opcode = SRP_LOGIN_RSP;
580: /* Don't advertise quite as many request as we support to
581: * keep room for management stuff etc...
582: */
583: rsp->req_lim_delta = cpu_to_be32(VSCSI_REQ_LIMIT-2);
584: rsp->tag = tag;
585: rsp->max_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
586: rsp->max_ti_iu_len = cpu_to_be32(sizeof(union srp_iu));
587: /* direct and indirect */
588: rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT);
589:
590: vscsi_send_iu(s, req, sizeof(*rsp), VIOSRP_SRP_FORMAT);
591: }
592:
593: static void vscsi_inquiry_no_target(VSCSIState *s, vscsi_req *req)
594: {
595: uint8_t *cdb = req->iu.srp.cmd.cdb;
596: uint8_t resp_data[36];
597: int rc, len, alen;
598:
599: /* We dont do EVPD. Also check that page_code is 0 */
600: if ((cdb[1] & 0x01) || (cdb[1] & 0x01) || cdb[2] != 0) {
601: /* Send INVALID FIELD IN CDB */
602: vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0);
603: vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
604: return;
605: }
606: alen = cdb[3];
607: alen = (alen << 8) | cdb[4];
608: len = MIN(alen, 36);
609:
610: /* Fake up inquiry using PQ=3 */
611: memset(resp_data, 0, 36);
612: resp_data[0] = 0x7f; /* Not capable of supporting a device here */
613: resp_data[2] = 0x06; /* SPS-4 */
614: resp_data[3] = 0x02; /* Resp data format */
615: resp_data[4] = 36 - 5; /* Additional length */
616: resp_data[7] = 0x10; /* Sync transfers */
617: memcpy(&resp_data[16], "QEMU EMPTY ", 16);
618: memcpy(&resp_data[8], "QEMU ", 8);
619:
620: req->writing = 0;
621: vscsi_preprocess_desc(req);
622: rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len);
623: if (rc < 0) {
624: vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
625: vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
626: } else {
627: vscsi_send_rsp(s, req, 0, 36 - rc, 0);
628: }
629: }
630:
631: static int vscsi_queue_cmd(VSCSIState *s, vscsi_req *req)
632: {
633: union srp_iu *srp = &req->iu.srp;
634: SCSIDevice *sdev;
635: int n, id, lun;
636:
637: vscsi_decode_id_lun(be64_to_cpu(srp->cmd.lun), &id, &lun);
638:
639: /* Qemu vs. linux issue with LUNs to be sorted out ... */
640: sdev = (id < 8 && lun < 16) ? s->bus.devs[id] : NULL;
641: if (!sdev) {
642: dprintf("VSCSI: Command for id %d with no drive\n", id);
643: if (srp->cmd.cdb[0] == INQUIRY) {
644: vscsi_inquiry_no_target(s, req);
645: } else {
646: vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0x00);
647: vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
648: } return 1;
649: }
650:
651: req->lun = lun;
652: req->sreq = scsi_req_new(sdev, req->qtag, lun, req);
653: n = scsi_req_enqueue(req->sreq, srp->cmd.cdb);
654:
655: dprintf("VSCSI: Queued command tag 0x%x CMD 0x%x ID %d LUN %d ret: %d\n",
656: req->qtag, srp->cmd.cdb[0], id, lun, n);
657:
658: if (n) {
659: /* Transfer direction must be set before preprocessing the
660: * descriptors
661: */
662: req->writing = (n < 1);
663:
664: /* Preprocess RDMA descriptors */
665: vscsi_preprocess_desc(req);
666:
667: /* Get transfer direction and initiate transfer */
668: if (n > 0) {
669: req->data_len = n;
670: } else if (n < 0) {
671: req->data_len = -n;
672: }
673: scsi_req_continue(req->sreq);
674: }
675: /* Don't touch req here, it may have been recycled already */
676:
677: return 0;
678: }
679:
680: static int vscsi_process_tsk_mgmt(VSCSIState *s, vscsi_req *req)
681: {
682: union viosrp_iu *iu = &req->iu;
683: int fn;
684:
685: fprintf(stderr, "vscsi_process_tsk_mgmt %02x\n",
686: iu->srp.tsk_mgmt.tsk_mgmt_func);
687:
688: switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
689: #if 0 /* We really don't deal with these for now */
690: case SRP_TSK_ABORT_TASK:
691: fn = ABORT_TASK;
692: break;
693: case SRP_TSK_ABORT_TASK_SET:
694: fn = ABORT_TASK_SET;
695: break;
696: case SRP_TSK_CLEAR_TASK_SET:
697: fn = CLEAR_TASK_SET;
698: break;
699: case SRP_TSK_LUN_RESET:
700: fn = LOGICAL_UNIT_RESET;
701: break;
702: case SRP_TSK_CLEAR_ACA:
703: fn = CLEAR_ACA;
704: break;
705: #endif
706: default:
707: fn = 0;
708: }
709: if (fn) {
710: /* XXX Send/Handle target task management */
711: ;
712: } else {
713: vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x20, 0);
714: vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
715: }
716: return !fn;
717: }
718:
719: static int vscsi_handle_srp_req(VSCSIState *s, vscsi_req *req)
720: {
721: union srp_iu *srp = &req->iu.srp;
722: int done = 1;
723: uint8_t opcode = srp->rsp.opcode;
724:
725: switch (opcode) {
726: case SRP_LOGIN_REQ:
727: vscsi_process_login(s, req);
728: break;
729: case SRP_TSK_MGMT:
730: done = vscsi_process_tsk_mgmt(s, req);
731: break;
732: case SRP_CMD:
733: done = vscsi_queue_cmd(s, req);
734: break;
735: case SRP_LOGIN_RSP:
736: case SRP_I_LOGOUT:
737: case SRP_T_LOGOUT:
738: case SRP_RSP:
739: case SRP_CRED_REQ:
740: case SRP_CRED_RSP:
741: case SRP_AER_REQ:
742: case SRP_AER_RSP:
743: fprintf(stderr, "VSCSI: Unsupported opcode %02x\n", opcode);
744: break;
745: default:
746: fprintf(stderr, "VSCSI: Unknown type %02x\n", opcode);
747: }
748:
749: return done;
750: }
751:
752: static int vscsi_send_adapter_info(VSCSIState *s, vscsi_req *req)
753: {
754: struct viosrp_adapter_info *sinfo;
755: struct mad_adapter_info_data info;
756: int rc;
757:
758: sinfo = &req->iu.mad.adapter_info;
759:
760: #if 0 /* What for ? */
761: rc = spapr_tce_dma_read(&s->vdev, be64_to_cpu(sinfo->buffer),
762: &info, be16_to_cpu(sinfo->common.length));
763: if (rc) {
764: fprintf(stderr, "vscsi_send_adapter_info: DMA read failure !\n");
765: }
766: #endif
767: memset(&info, 0, sizeof(info));
768: strcpy(info.srp_version, SRP_VERSION);
769: strncpy(info.partition_name, "qemu", sizeof("qemu"));
770: info.partition_number = cpu_to_be32(0);
771: info.mad_version = cpu_to_be32(1);
772: info.os_type = cpu_to_be32(2);
773: info.port_max_txu[0] = cpu_to_be32(VSCSI_MAX_SECTORS << 9);
774:
775: rc = spapr_tce_dma_write(&s->vdev, be64_to_cpu(sinfo->buffer),
776: &info, be16_to_cpu(sinfo->common.length));
777: if (rc) {
778: fprintf(stderr, "vscsi_send_adapter_info: DMA write failure !\n");
779: }
780:
781: sinfo->common.status = rc ? cpu_to_be32(1) : 0;
782:
783: return vscsi_send_iu(s, req, sizeof(*sinfo), VIOSRP_MAD_FORMAT);
784: }
785:
786: static int vscsi_handle_mad_req(VSCSIState *s, vscsi_req *req)
787: {
788: union mad_iu *mad = &req->iu.mad;
789:
790: switch (be32_to_cpu(mad->empty_iu.common.type)) {
791: case VIOSRP_EMPTY_IU_TYPE:
792: fprintf(stderr, "Unsupported EMPTY MAD IU\n");
793: break;
794: case VIOSRP_ERROR_LOG_TYPE:
795: fprintf(stderr, "Unsupported ERROR LOG MAD IU\n");
796: mad->error_log.common.status = cpu_to_be16(1);
797: vscsi_send_iu(s, req, sizeof(mad->error_log), VIOSRP_MAD_FORMAT);
798: break;
799: case VIOSRP_ADAPTER_INFO_TYPE:
800: vscsi_send_adapter_info(s, req);
801: break;
802: case VIOSRP_HOST_CONFIG_TYPE:
803: mad->host_config.common.status = cpu_to_be16(1);
804: vscsi_send_iu(s, req, sizeof(mad->host_config), VIOSRP_MAD_FORMAT);
805: break;
806: default:
807: fprintf(stderr, "VSCSI: Unknown MAD type %02x\n",
808: be32_to_cpu(mad->empty_iu.common.type));
809: }
810:
811: return 1;
812: }
813:
814: static void vscsi_got_payload(VSCSIState *s, vscsi_crq *crq)
815: {
816: vscsi_req *req;
817: int done;
818:
819: req = vscsi_get_req(s);
820: if (req == NULL) {
821: fprintf(stderr, "VSCSI: Failed to get a request !\n");
822: return;
823: }
824:
825: /* We only support a limited number of descriptors, we know
826: * the ibmvscsi driver uses up to 10 max, so it should fit
827: * in our 256 bytes IUs. If not we'll have to increase the size
828: * of the structure.
829: */
830: if (crq->s.IU_length > sizeof(union viosrp_iu)) {
831: fprintf(stderr, "VSCSI: SRP IU too long (%d bytes) !\n",
832: crq->s.IU_length);
833: return;
834: }
835:
836: /* XXX Handle failure differently ? */
837: if (spapr_tce_dma_read(&s->vdev, crq->s.IU_data_ptr, &req->iu,
838: crq->s.IU_length)) {
839: fprintf(stderr, "vscsi_got_payload: DMA read failure !\n");
840: qemu_free(req);
841: }
842: memcpy(&req->crq, crq, sizeof(vscsi_crq));
843:
844: if (crq->s.format == VIOSRP_MAD_FORMAT) {
845: done = vscsi_handle_mad_req(s, req);
846: } else {
847: done = vscsi_handle_srp_req(s, req);
848: }
849:
850: if (done) {
851: vscsi_put_req(req);
852: }
853: }
854:
855:
856: static int vscsi_do_crq(struct VIOsPAPRDevice *dev, uint8_t *crq_data)
857: {
858: VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
859: vscsi_crq crq;
860:
861: memcpy(crq.raw, crq_data, 16);
862: crq.s.timeout = be16_to_cpu(crq.s.timeout);
863: crq.s.IU_length = be16_to_cpu(crq.s.IU_length);
864: crq.s.IU_data_ptr = be64_to_cpu(crq.s.IU_data_ptr);
865:
866: dprintf("VSCSI: do_crq %02x %02x ...\n", crq.raw[0], crq.raw[1]);
867:
868: switch (crq.s.valid) {
869: case 0xc0: /* Init command/response */
870:
871: /* Respond to initialization request */
872: if (crq.s.format == 0x01) {
873: memset(crq.raw, 0, 16);
874: crq.s.valid = 0xc0;
875: crq.s.format = 0x02;
876: spapr_vio_send_crq(dev, crq.raw);
877: }
878:
879: /* Note that in hotplug cases, we might get a 0x02
880: * as a result of us emitting the init request
881: */
882:
883: break;
884: case 0xff: /* Link event */
885:
886: /* Not handled for now */
887:
888: break;
889: case 0x80: /* Payloads */
890: switch (crq.s.format) {
891: case VIOSRP_SRP_FORMAT: /* AKA VSCSI request */
892: case VIOSRP_MAD_FORMAT: /* AKA VSCSI response */
893: vscsi_got_payload(s, &crq);
894: break;
895: case VIOSRP_OS400_FORMAT:
896: case VIOSRP_AIX_FORMAT:
897: case VIOSRP_LINUX_FORMAT:
898: case VIOSRP_INLINE_FORMAT:
899: fprintf(stderr, "vscsi_do_srq: Unsupported payload format %02x\n",
900: crq.s.format);
901: break;
902: default:
903: fprintf(stderr, "vscsi_do_srq: Unknown payload format %02x\n",
904: crq.s.format);
905: }
906: break;
907: default:
908: fprintf(stderr, "vscsi_do_crq: unknown CRQ %02x %02x ...\n",
909: crq.raw[0], crq.raw[1]);
910: };
911:
912: return 0;
913: }
914:
915: static const struct SCSIBusOps vscsi_scsi_ops = {
916: .transfer_data = vscsi_transfer_data,
917: .complete = vscsi_command_complete,
918: .cancel = vscsi_request_cancelled
919: };
920:
921: static int spapr_vscsi_init(VIOsPAPRDevice *dev)
922: {
923: VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
924: int i;
925:
926: dbg_vscsi_state = s;
927:
928: /* Initialize qemu request tags */
929: memset(s->reqs, 0, sizeof(s->reqs));
930: for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
931: s->reqs[i].qtag = i;
932: }
933:
934: dev->crq.SendFunc = vscsi_do_crq;
935:
936: scsi_bus_new(&s->bus, &dev->qdev, 1, VSCSI_REQ_LIMIT,
937: &vscsi_scsi_ops);
938: if (!dev->qdev.hotplugged) {
939: scsi_bus_legacy_handle_cmdline(&s->bus);
940: }
941:
942: return 0;
943: }
944:
945: void spapr_vscsi_create(VIOsPAPRBus *bus, uint32_t reg,
946: qemu_irq qirq, uint32_t vio_irq_num)
947: {
948: DeviceState *dev;
949: VIOsPAPRDevice *sdev;
950:
951: dev = qdev_create(&bus->bus, "spapr-vscsi");
952: qdev_prop_set_uint32(dev, "reg", reg);
953:
954: qdev_init_nofail(dev);
955:
956: sdev = (VIOsPAPRDevice *)dev;
957: sdev->qirq = qirq;
958: sdev->vio_irq_num = vio_irq_num;
959: }
960:
961: static int spapr_vscsi_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
962: {
963: int ret;
964:
965: ret = fdt_setprop_cell(fdt, node_off, "#address-cells", 2);
966: if (ret < 0) {
967: return ret;
968: }
969:
970: ret = fdt_setprop_cell(fdt, node_off, "#size-cells", 0);
971: if (ret < 0) {
972: return ret;
973: }
974:
975: return 0;
976: }
977:
978: static VIOsPAPRDeviceInfo spapr_vscsi = {
979: .init = spapr_vscsi_init,
980: .devnode = spapr_vscsi_devnode,
981: .dt_name = "v-scsi",
982: .dt_type = "vscsi",
983: .dt_compatible = "IBM,v-scsi",
984: .signal_mask = 0x00000001,
985: .qdev.name = "spapr-vscsi",
986: .qdev.size = sizeof(VSCSIState),
987: .qdev.props = (Property[]) {
988: DEFINE_PROP_UINT32("reg", VIOsPAPRDevice, reg, 0x2000),
989: DEFINE_PROP_UINT32("dma-window", VIOsPAPRDevice,
990: rtce_window_size, 0x10000000),
991: DEFINE_PROP_END_OF_LIST(),
992: },
993: };
994:
995: static void spapr_vscsi_register(void)
996: {
997: spapr_vio_bus_register_withprop(&spapr_vscsi);
998: }
999: device_init(spapr_vscsi_register);
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