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26b14823 FT |
1 | /* |
2 | * SCSI RDAM Protocol lib functions | |
3 | * | |
4 | * Copyright (C) 2006 FUJITA Tomonori <tomof@acm.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation; either version 2 of the | |
9 | * License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
19 | * 02110-1301 USA | |
20 | */ | |
21 | #include <linux/err.h> | |
22 | #include <linux/kfifo.h> | |
23 | #include <linux/scatterlist.h> | |
24 | #include <linux/dma-mapping.h> | |
26b14823 FT |
25 | #include <scsi/scsi.h> |
26 | #include <scsi/scsi_cmnd.h> | |
27 | #include <scsi/scsi_tcq.h> | |
28 | #include <scsi/scsi_tgt.h> | |
29 | #include <scsi/srp.h> | |
30 | #include <scsi/libsrp.h> | |
31 | ||
32 | enum srp_task_attributes { | |
33 | SRP_SIMPLE_TASK = 0, | |
34 | SRP_HEAD_TASK = 1, | |
35 | SRP_ORDERED_TASK = 2, | |
36 | SRP_ACA_TASK = 4 | |
37 | }; | |
38 | ||
39 | /* tmp - will replace with SCSI logging stuff */ | |
40 | #define eprintk(fmt, args...) \ | |
41 | do { \ | |
cadbd4a5 | 42 | printk("%s(%d) " fmt, __func__, __LINE__, ##args); \ |
26b14823 FT |
43 | } while (0) |
44 | /* #define dprintk eprintk */ | |
45 | #define dprintk(fmt, args...) | |
46 | ||
47 | static int srp_iu_pool_alloc(struct srp_queue *q, size_t max, | |
48 | struct srp_buf **ring) | |
49 | { | |
50 | int i; | |
51 | struct iu_entry *iue; | |
52 | ||
53 | q->pool = kcalloc(max, sizeof(struct iu_entry *), GFP_KERNEL); | |
54 | if (!q->pool) | |
55 | return -ENOMEM; | |
56 | q->items = kcalloc(max, sizeof(struct iu_entry), GFP_KERNEL); | |
57 | if (!q->items) | |
58 | goto free_pool; | |
59 | ||
60 | spin_lock_init(&q->lock); | |
c1e13f25 | 61 | kfifo_init(&q->queue, (void *) q->pool, max * sizeof(void *)); |
26b14823 FT |
62 | |
63 | for (i = 0, iue = q->items; i < max; i++) { | |
7acd72eb | 64 | kfifo_in(&q->queue, (void *) &iue, sizeof(void *)); |
26b14823 FT |
65 | iue->sbuf = ring[i]; |
66 | iue++; | |
67 | } | |
68 | return 0; | |
69 | ||
26b14823 FT |
70 | kfree(q->items); |
71 | free_pool: | |
72 | kfree(q->pool); | |
73 | return -ENOMEM; | |
74 | } | |
75 | ||
76 | static void srp_iu_pool_free(struct srp_queue *q) | |
77 | { | |
78 | kfree(q->items); | |
79 | kfree(q->pool); | |
80 | } | |
81 | ||
82 | static struct srp_buf **srp_ring_alloc(struct device *dev, | |
83 | size_t max, size_t size) | |
84 | { | |
85 | int i; | |
86 | struct srp_buf **ring; | |
87 | ||
88 | ring = kcalloc(max, sizeof(struct srp_buf *), GFP_KERNEL); | |
89 | if (!ring) | |
90 | return NULL; | |
91 | ||
92 | for (i = 0; i < max; i++) { | |
93 | ring[i] = kzalloc(sizeof(struct srp_buf), GFP_KERNEL); | |
94 | if (!ring[i]) | |
95 | goto out; | |
96 | ring[i]->buf = dma_alloc_coherent(dev, size, &ring[i]->dma, | |
97 | GFP_KERNEL); | |
98 | if (!ring[i]->buf) | |
99 | goto out; | |
100 | } | |
101 | return ring; | |
102 | ||
103 | out: | |
104 | for (i = 0; i < max && ring[i]; i++) { | |
105 | if (ring[i]->buf) | |
106 | dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma); | |
107 | kfree(ring[i]); | |
108 | } | |
109 | kfree(ring); | |
110 | ||
111 | return NULL; | |
112 | } | |
113 | ||
114 | static void srp_ring_free(struct device *dev, struct srp_buf **ring, size_t max, | |
115 | size_t size) | |
116 | { | |
117 | int i; | |
118 | ||
119 | for (i = 0; i < max; i++) { | |
120 | dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma); | |
121 | kfree(ring[i]); | |
122 | } | |
afffd3da | 123 | kfree(ring); |
26b14823 FT |
124 | } |
125 | ||
126 | int srp_target_alloc(struct srp_target *target, struct device *dev, | |
127 | size_t nr, size_t iu_size) | |
128 | { | |
129 | int err; | |
130 | ||
131 | spin_lock_init(&target->lock); | |
132 | INIT_LIST_HEAD(&target->cmd_queue); | |
133 | ||
134 | target->dev = dev; | |
78c55d76 | 135 | dev_set_drvdata(target->dev, target); |
26b14823 FT |
136 | |
137 | target->srp_iu_size = iu_size; | |
138 | target->rx_ring_size = nr; | |
139 | target->rx_ring = srp_ring_alloc(target->dev, nr, iu_size); | |
140 | if (!target->rx_ring) | |
141 | return -ENOMEM; | |
142 | err = srp_iu_pool_alloc(&target->iu_queue, nr, target->rx_ring); | |
143 | if (err) | |
144 | goto free_ring; | |
145 | ||
146 | return 0; | |
147 | ||
148 | free_ring: | |
149 | srp_ring_free(target->dev, target->rx_ring, nr, iu_size); | |
150 | return -ENOMEM; | |
151 | } | |
152 | EXPORT_SYMBOL_GPL(srp_target_alloc); | |
153 | ||
154 | void srp_target_free(struct srp_target *target) | |
155 | { | |
156 | srp_ring_free(target->dev, target->rx_ring, target->rx_ring_size, | |
157 | target->srp_iu_size); | |
158 | srp_iu_pool_free(&target->iu_queue); | |
159 | } | |
160 | EXPORT_SYMBOL_GPL(srp_target_free); | |
161 | ||
162 | struct iu_entry *srp_iu_get(struct srp_target *target) | |
163 | { | |
164 | struct iu_entry *iue = NULL; | |
165 | ||
7acd72eb | 166 | kfifo_out_locked(&target->iu_queue.queue, (void *) &iue, |
c1e13f25 | 167 | sizeof(void *), &target->iu_queue.lock); |
26b14823 FT |
168 | if (!iue) |
169 | return iue; | |
170 | iue->target = target; | |
171 | INIT_LIST_HEAD(&iue->ilist); | |
172 | iue->flags = 0; | |
173 | return iue; | |
174 | } | |
175 | EXPORT_SYMBOL_GPL(srp_iu_get); | |
176 | ||
177 | void srp_iu_put(struct iu_entry *iue) | |
178 | { | |
7acd72eb | 179 | kfifo_in_locked(&iue->target->iu_queue.queue, (void *) &iue, |
c1e13f25 | 180 | sizeof(void *), &iue->target->iu_queue.lock); |
26b14823 FT |
181 | } |
182 | EXPORT_SYMBOL_GPL(srp_iu_put); | |
183 | ||
184 | static int srp_direct_data(struct scsi_cmnd *sc, struct srp_direct_buf *md, | |
185 | enum dma_data_direction dir, srp_rdma_t rdma_io, | |
186 | int dma_map, int ext_desc) | |
187 | { | |
188 | struct iu_entry *iue = NULL; | |
189 | struct scatterlist *sg = NULL; | |
190 | int err, nsg = 0, len; | |
191 | ||
192 | if (dma_map) { | |
193 | iue = (struct iu_entry *) sc->SCp.ptr; | |
f10ab66f | 194 | sg = scsi_sglist(sc); |
26b14823 | 195 | |
f10ab66f FT |
196 | dprintk("%p %u %u %d\n", iue, scsi_bufflen(sc), |
197 | md->len, scsi_sg_count(sc)); | |
26b14823 | 198 | |
f10ab66f | 199 | nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc), |
26b14823 FT |
200 | DMA_BIDIRECTIONAL); |
201 | if (!nsg) { | |
f10ab66f | 202 | printk("fail to map %p %d\n", iue, scsi_sg_count(sc)); |
26b14823 FT |
203 | return 0; |
204 | } | |
f10ab66f | 205 | len = min(scsi_bufflen(sc), md->len); |
26b14823 FT |
206 | } else |
207 | len = md->len; | |
208 | ||
209 | err = rdma_io(sc, sg, nsg, md, 1, dir, len); | |
210 | ||
211 | if (dma_map) | |
212 | dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL); | |
213 | ||
214 | return err; | |
215 | } | |
216 | ||
217 | static int srp_indirect_data(struct scsi_cmnd *sc, struct srp_cmd *cmd, | |
218 | struct srp_indirect_buf *id, | |
219 | enum dma_data_direction dir, srp_rdma_t rdma_io, | |
220 | int dma_map, int ext_desc) | |
221 | { | |
222 | struct iu_entry *iue = NULL; | |
223 | struct srp_direct_buf *md = NULL; | |
224 | struct scatterlist dummy, *sg = NULL; | |
225 | dma_addr_t token = 0; | |
ad1331a7 | 226 | int err = 0; |
26b14823 FT |
227 | int nmd, nsg = 0, len; |
228 | ||
229 | if (dma_map || ext_desc) { | |
230 | iue = (struct iu_entry *) sc->SCp.ptr; | |
f10ab66f | 231 | sg = scsi_sglist(sc); |
26b14823 FT |
232 | |
233 | dprintk("%p %u %u %d %d\n", | |
f10ab66f | 234 | iue, scsi_bufflen(sc), id->len, |
26b14823 FT |
235 | cmd->data_in_desc_cnt, cmd->data_out_desc_cnt); |
236 | } | |
237 | ||
238 | nmd = id->table_desc.len / sizeof(struct srp_direct_buf); | |
239 | ||
240 | if ((dir == DMA_FROM_DEVICE && nmd == cmd->data_in_desc_cnt) || | |
241 | (dir == DMA_TO_DEVICE && nmd == cmd->data_out_desc_cnt)) { | |
242 | md = &id->desc_list[0]; | |
243 | goto rdma; | |
244 | } | |
245 | ||
246 | if (ext_desc && dma_map) { | |
247 | md = dma_alloc_coherent(iue->target->dev, id->table_desc.len, | |
248 | &token, GFP_KERNEL); | |
249 | if (!md) { | |
250 | eprintk("Can't get dma memory %u\n", id->table_desc.len); | |
251 | return -ENOMEM; | |
252 | } | |
253 | ||
254 | sg_init_one(&dummy, md, id->table_desc.len); | |
255 | sg_dma_address(&dummy) = token; | |
bcd4e225 | 256 | sg_dma_len(&dummy) = id->table_desc.len; |
26b14823 FT |
257 | err = rdma_io(sc, &dummy, 1, &id->table_desc, 1, DMA_TO_DEVICE, |
258 | id->table_desc.len); | |
ad1331a7 BB |
259 | if (err) { |
260 | eprintk("Error copying indirect table %d\n", err); | |
26b14823 FT |
261 | goto free_mem; |
262 | } | |
263 | } else { | |
264 | eprintk("This command uses external indirect buffer\n"); | |
265 | return -EINVAL; | |
266 | } | |
267 | ||
268 | rdma: | |
269 | if (dma_map) { | |
f10ab66f FT |
270 | nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc), |
271 | DMA_BIDIRECTIONAL); | |
26b14823 | 272 | if (!nsg) { |
f10ab66f | 273 | eprintk("fail to map %p %d\n", iue, scsi_sg_count(sc)); |
ad1331a7 | 274 | err = -EIO; |
26b14823 FT |
275 | goto free_mem; |
276 | } | |
f10ab66f | 277 | len = min(scsi_bufflen(sc), id->len); |
26b14823 FT |
278 | } else |
279 | len = id->len; | |
280 | ||
281 | err = rdma_io(sc, sg, nsg, md, nmd, dir, len); | |
282 | ||
283 | if (dma_map) | |
284 | dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL); | |
285 | ||
286 | free_mem: | |
287 | if (token && dma_map) | |
288 | dma_free_coherent(iue->target->dev, id->table_desc.len, md, token); | |
289 | ||
ad1331a7 | 290 | return err; |
26b14823 FT |
291 | } |
292 | ||
293 | static int data_out_desc_size(struct srp_cmd *cmd) | |
294 | { | |
295 | int size = 0; | |
296 | u8 fmt = cmd->buf_fmt >> 4; | |
297 | ||
298 | switch (fmt) { | |
299 | case SRP_NO_DATA_DESC: | |
300 | break; | |
301 | case SRP_DATA_DESC_DIRECT: | |
302 | size = sizeof(struct srp_direct_buf); | |
303 | break; | |
304 | case SRP_DATA_DESC_INDIRECT: | |
305 | size = sizeof(struct srp_indirect_buf) + | |
306 | sizeof(struct srp_direct_buf) * cmd->data_out_desc_cnt; | |
307 | break; | |
308 | default: | |
309 | eprintk("client error. Invalid data_out_format %x\n", fmt); | |
310 | break; | |
311 | } | |
312 | return size; | |
313 | } | |
314 | ||
315 | /* | |
316 | * TODO: this can be called multiple times for a single command if it | |
317 | * has very long data. | |
318 | */ | |
319 | int srp_transfer_data(struct scsi_cmnd *sc, struct srp_cmd *cmd, | |
320 | srp_rdma_t rdma_io, int dma_map, int ext_desc) | |
321 | { | |
322 | struct srp_direct_buf *md; | |
323 | struct srp_indirect_buf *id; | |
324 | enum dma_data_direction dir; | |
325 | int offset, err = 0; | |
326 | u8 format; | |
327 | ||
328 | offset = cmd->add_cdb_len * 4; | |
329 | ||
330 | dir = srp_cmd_direction(cmd); | |
331 | if (dir == DMA_FROM_DEVICE) | |
332 | offset += data_out_desc_size(cmd); | |
333 | ||
334 | if (dir == DMA_TO_DEVICE) | |
335 | format = cmd->buf_fmt >> 4; | |
336 | else | |
337 | format = cmd->buf_fmt & ((1U << 4) - 1); | |
338 | ||
339 | switch (format) { | |
340 | case SRP_NO_DATA_DESC: | |
341 | break; | |
342 | case SRP_DATA_DESC_DIRECT: | |
343 | md = (struct srp_direct_buf *) | |
344 | (cmd->add_data + offset); | |
345 | err = srp_direct_data(sc, md, dir, rdma_io, dma_map, ext_desc); | |
346 | break; | |
347 | case SRP_DATA_DESC_INDIRECT: | |
348 | id = (struct srp_indirect_buf *) | |
349 | (cmd->add_data + offset); | |
350 | err = srp_indirect_data(sc, cmd, id, dir, rdma_io, dma_map, | |
351 | ext_desc); | |
352 | break; | |
353 | default: | |
354 | eprintk("Unknown format %d %x\n", dir, format); | |
ad1331a7 | 355 | err = -EINVAL; |
26b14823 FT |
356 | } |
357 | ||
358 | return err; | |
359 | } | |
360 | EXPORT_SYMBOL_GPL(srp_transfer_data); | |
361 | ||
362 | static int vscsis_data_length(struct srp_cmd *cmd, enum dma_data_direction dir) | |
363 | { | |
364 | struct srp_direct_buf *md; | |
365 | struct srp_indirect_buf *id; | |
366 | int len = 0, offset = cmd->add_cdb_len * 4; | |
367 | u8 fmt; | |
368 | ||
369 | if (dir == DMA_TO_DEVICE) | |
370 | fmt = cmd->buf_fmt >> 4; | |
371 | else { | |
372 | fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
373 | offset += data_out_desc_size(cmd); | |
374 | } | |
375 | ||
376 | switch (fmt) { | |
377 | case SRP_NO_DATA_DESC: | |
378 | break; | |
379 | case SRP_DATA_DESC_DIRECT: | |
380 | md = (struct srp_direct_buf *) (cmd->add_data + offset); | |
381 | len = md->len; | |
382 | break; | |
383 | case SRP_DATA_DESC_INDIRECT: | |
384 | id = (struct srp_indirect_buf *) (cmd->add_data + offset); | |
385 | len = id->len; | |
386 | break; | |
387 | default: | |
388 | eprintk("invalid data format %x\n", fmt); | |
389 | break; | |
390 | } | |
391 | return len; | |
392 | } | |
393 | ||
394 | int srp_cmd_queue(struct Scsi_Host *shost, struct srp_cmd *cmd, void *info, | |
17b0bcfa | 395 | u64 itn_id, u64 addr) |
26b14823 FT |
396 | { |
397 | enum dma_data_direction dir; | |
398 | struct scsi_cmnd *sc; | |
399 | int tag, len, err; | |
400 | ||
401 | switch (cmd->task_attr) { | |
402 | case SRP_SIMPLE_TASK: | |
403 | tag = MSG_SIMPLE_TAG; | |
404 | break; | |
405 | case SRP_ORDERED_TASK: | |
406 | tag = MSG_ORDERED_TAG; | |
407 | break; | |
408 | case SRP_HEAD_TASK: | |
409 | tag = MSG_HEAD_TAG; | |
410 | break; | |
411 | default: | |
412 | eprintk("Task attribute %d not supported\n", cmd->task_attr); | |
413 | tag = MSG_ORDERED_TAG; | |
414 | } | |
415 | ||
416 | dir = srp_cmd_direction(cmd); | |
417 | len = vscsis_data_length(cmd, dir); | |
418 | ||
419 | dprintk("%p %x %lx %d %d %d %llx\n", info, cmd->cdb[0], | |
420 | cmd->lun, dir, len, tag, (unsigned long long) cmd->tag); | |
421 | ||
422 | sc = scsi_host_get_command(shost, dir, GFP_KERNEL); | |
423 | if (!sc) | |
424 | return -ENOMEM; | |
425 | ||
426 | sc->SCp.ptr = info; | |
427 | memcpy(sc->cmnd, cmd->cdb, MAX_COMMAND_SIZE); | |
30b0c37b BH |
428 | sc->sdb.length = len; |
429 | sc->sdb.table.sgl = (void *) (unsigned long) addr; | |
26b14823 | 430 | sc->tag = tag; |
17b0bcfa FT |
431 | err = scsi_tgt_queue_command(sc, itn_id, (struct scsi_lun *)&cmd->lun, |
432 | cmd->tag); | |
26b14823 FT |
433 | if (err) |
434 | scsi_host_put_command(shost, sc); | |
435 | ||
436 | return err; | |
437 | } | |
438 | EXPORT_SYMBOL_GPL(srp_cmd_queue); | |
439 | ||
440 | MODULE_DESCRIPTION("SCSI RDAM Protocol lib functions"); | |
441 | MODULE_AUTHOR("FUJITA Tomonori"); | |
442 | MODULE_LICENSE("GPL"); |