Root/
1 | /* |
2 | * SCSI RDMA 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/slab.h> |
23 | #include <linux/kfifo.h> |
24 | #include <linux/scatterlist.h> |
25 | #include <linux/dma-mapping.h> |
26 | #include <scsi/scsi.h> |
27 | #include <scsi/scsi_cmnd.h> |
28 | #include <scsi/scsi_tcq.h> |
29 | #include <scsi/scsi_tgt.h> |
30 | #include <scsi/srp.h> |
31 | #include <scsi/libsrp.h> |
32 | |
33 | enum srp_task_attributes { |
34 | SRP_SIMPLE_TASK = 0, |
35 | SRP_HEAD_TASK = 1, |
36 | SRP_ORDERED_TASK = 2, |
37 | SRP_ACA_TASK = 4 |
38 | }; |
39 | |
40 | /* tmp - will replace with SCSI logging stuff */ |
41 | #define eprintk(fmt, args...) \ |
42 | do { \ |
43 | printk("%s(%d) " fmt, __func__, __LINE__, ##args); \ |
44 | } while (0) |
45 | /* #define dprintk eprintk */ |
46 | #define dprintk(fmt, args...) |
47 | |
48 | static int srp_iu_pool_alloc(struct srp_queue *q, size_t max, |
49 | struct srp_buf **ring) |
50 | { |
51 | int i; |
52 | struct iu_entry *iue; |
53 | |
54 | q->pool = kcalloc(max, sizeof(struct iu_entry *), GFP_KERNEL); |
55 | if (!q->pool) |
56 | return -ENOMEM; |
57 | q->items = kcalloc(max, sizeof(struct iu_entry), GFP_KERNEL); |
58 | if (!q->items) |
59 | goto free_pool; |
60 | |
61 | spin_lock_init(&q->lock); |
62 | kfifo_init(&q->queue, (void *) q->pool, max * sizeof(void *)); |
63 | |
64 | for (i = 0, iue = q->items; i < max; i++) { |
65 | kfifo_in(&q->queue, (void *) &iue, sizeof(void *)); |
66 | iue->sbuf = ring[i]; |
67 | iue++; |
68 | } |
69 | return 0; |
70 | |
71 | kfree(q->items); |
72 | free_pool: |
73 | kfree(q->pool); |
74 | return -ENOMEM; |
75 | } |
76 | |
77 | static void srp_iu_pool_free(struct srp_queue *q) |
78 | { |
79 | kfree(q->items); |
80 | kfree(q->pool); |
81 | } |
82 | |
83 | static struct srp_buf **srp_ring_alloc(struct device *dev, |
84 | size_t max, size_t size) |
85 | { |
86 | int i; |
87 | struct srp_buf **ring; |
88 | |
89 | ring = kcalloc(max, sizeof(struct srp_buf *), GFP_KERNEL); |
90 | if (!ring) |
91 | return NULL; |
92 | |
93 | for (i = 0; i < max; i++) { |
94 | ring[i] = kzalloc(sizeof(struct srp_buf), GFP_KERNEL); |
95 | if (!ring[i]) |
96 | goto out; |
97 | ring[i]->buf = dma_alloc_coherent(dev, size, &ring[i]->dma, |
98 | GFP_KERNEL); |
99 | if (!ring[i]->buf) |
100 | goto out; |
101 | } |
102 | return ring; |
103 | |
104 | out: |
105 | for (i = 0; i < max && ring[i]; i++) { |
106 | if (ring[i]->buf) |
107 | dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma); |
108 | kfree(ring[i]); |
109 | } |
110 | kfree(ring); |
111 | |
112 | return NULL; |
113 | } |
114 | |
115 | static void srp_ring_free(struct device *dev, struct srp_buf **ring, size_t max, |
116 | size_t size) |
117 | { |
118 | int i; |
119 | |
120 | for (i = 0; i < max; i++) { |
121 | dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma); |
122 | kfree(ring[i]); |
123 | } |
124 | kfree(ring); |
125 | } |
126 | |
127 | int srp_target_alloc(struct srp_target *target, struct device *dev, |
128 | size_t nr, size_t iu_size) |
129 | { |
130 | int err; |
131 | |
132 | spin_lock_init(&target->lock); |
133 | INIT_LIST_HEAD(&target->cmd_queue); |
134 | |
135 | target->dev = dev; |
136 | dev_set_drvdata(target->dev, target); |
137 | |
138 | target->srp_iu_size = iu_size; |
139 | target->rx_ring_size = nr; |
140 | target->rx_ring = srp_ring_alloc(target->dev, nr, iu_size); |
141 | if (!target->rx_ring) |
142 | return -ENOMEM; |
143 | err = srp_iu_pool_alloc(&target->iu_queue, nr, target->rx_ring); |
144 | if (err) |
145 | goto free_ring; |
146 | |
147 | return 0; |
148 | |
149 | free_ring: |
150 | srp_ring_free(target->dev, target->rx_ring, nr, iu_size); |
151 | return -ENOMEM; |
152 | } |
153 | EXPORT_SYMBOL_GPL(srp_target_alloc); |
154 | |
155 | void srp_target_free(struct srp_target *target) |
156 | { |
157 | srp_ring_free(target->dev, target->rx_ring, target->rx_ring_size, |
158 | target->srp_iu_size); |
159 | srp_iu_pool_free(&target->iu_queue); |
160 | } |
161 | EXPORT_SYMBOL_GPL(srp_target_free); |
162 | |
163 | struct iu_entry *srp_iu_get(struct srp_target *target) |
164 | { |
165 | struct iu_entry *iue = NULL; |
166 | |
167 | if (kfifo_out_locked(&target->iu_queue.queue, (void *) &iue, |
168 | sizeof(void *), &target->iu_queue.lock) != sizeof(void *)) { |
169 | WARN_ONCE(1, "unexpected fifo state"); |
170 | return NULL; |
171 | } |
172 | if (!iue) |
173 | return iue; |
174 | iue->target = target; |
175 | INIT_LIST_HEAD(&iue->ilist); |
176 | iue->flags = 0; |
177 | return iue; |
178 | } |
179 | EXPORT_SYMBOL_GPL(srp_iu_get); |
180 | |
181 | void srp_iu_put(struct iu_entry *iue) |
182 | { |
183 | kfifo_in_locked(&iue->target->iu_queue.queue, (void *) &iue, |
184 | sizeof(void *), &iue->target->iu_queue.lock); |
185 | } |
186 | EXPORT_SYMBOL_GPL(srp_iu_put); |
187 | |
188 | static int srp_direct_data(struct scsi_cmnd *sc, struct srp_direct_buf *md, |
189 | enum dma_data_direction dir, srp_rdma_t rdma_io, |
190 | int dma_map, int ext_desc) |
191 | { |
192 | struct iu_entry *iue = NULL; |
193 | struct scatterlist *sg = NULL; |
194 | int err, nsg = 0, len; |
195 | |
196 | if (dma_map) { |
197 | iue = (struct iu_entry *) sc->SCp.ptr; |
198 | sg = scsi_sglist(sc); |
199 | |
200 | dprintk("%p %u %u %d\n", iue, scsi_bufflen(sc), |
201 | md->len, scsi_sg_count(sc)); |
202 | |
203 | nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc), |
204 | DMA_BIDIRECTIONAL); |
205 | if (!nsg) { |
206 | printk("fail to map %p %d\n", iue, scsi_sg_count(sc)); |
207 | return 0; |
208 | } |
209 | len = min(scsi_bufflen(sc), md->len); |
210 | } else |
211 | len = md->len; |
212 | |
213 | err = rdma_io(sc, sg, nsg, md, 1, dir, len); |
214 | |
215 | if (dma_map) |
216 | dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL); |
217 | |
218 | return err; |
219 | } |
220 | |
221 | static int srp_indirect_data(struct scsi_cmnd *sc, struct srp_cmd *cmd, |
222 | struct srp_indirect_buf *id, |
223 | enum dma_data_direction dir, srp_rdma_t rdma_io, |
224 | int dma_map, int ext_desc) |
225 | { |
226 | struct iu_entry *iue = NULL; |
227 | struct srp_direct_buf *md = NULL; |
228 | struct scatterlist dummy, *sg = NULL; |
229 | dma_addr_t token = 0; |
230 | int err = 0; |
231 | int nmd, nsg = 0, len; |
232 | |
233 | if (dma_map || ext_desc) { |
234 | iue = (struct iu_entry *) sc->SCp.ptr; |
235 | sg = scsi_sglist(sc); |
236 | |
237 | dprintk("%p %u %u %d %d\n", |
238 | iue, scsi_bufflen(sc), id->len, |
239 | cmd->data_in_desc_cnt, cmd->data_out_desc_cnt); |
240 | } |
241 | |
242 | nmd = id->table_desc.len / sizeof(struct srp_direct_buf); |
243 | |
244 | if ((dir == DMA_FROM_DEVICE && nmd == cmd->data_in_desc_cnt) || |
245 | (dir == DMA_TO_DEVICE && nmd == cmd->data_out_desc_cnt)) { |
246 | md = &id->desc_list[0]; |
247 | goto rdma; |
248 | } |
249 | |
250 | if (ext_desc && dma_map) { |
251 | md = dma_alloc_coherent(iue->target->dev, id->table_desc.len, |
252 | &token, GFP_KERNEL); |
253 | if (!md) { |
254 | eprintk("Can't get dma memory %u\n", id->table_desc.len); |
255 | return -ENOMEM; |
256 | } |
257 | |
258 | sg_init_one(&dummy, md, id->table_desc.len); |
259 | sg_dma_address(&dummy) = token; |
260 | sg_dma_len(&dummy) = id->table_desc.len; |
261 | err = rdma_io(sc, &dummy, 1, &id->table_desc, 1, DMA_TO_DEVICE, |
262 | id->table_desc.len); |
263 | if (err) { |
264 | eprintk("Error copying indirect table %d\n", err); |
265 | goto free_mem; |
266 | } |
267 | } else { |
268 | eprintk("This command uses external indirect buffer\n"); |
269 | return -EINVAL; |
270 | } |
271 | |
272 | rdma: |
273 | if (dma_map) { |
274 | nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc), |
275 | DMA_BIDIRECTIONAL); |
276 | if (!nsg) { |
277 | eprintk("fail to map %p %d\n", iue, scsi_sg_count(sc)); |
278 | err = -EIO; |
279 | goto free_mem; |
280 | } |
281 | len = min(scsi_bufflen(sc), id->len); |
282 | } else |
283 | len = id->len; |
284 | |
285 | err = rdma_io(sc, sg, nsg, md, nmd, dir, len); |
286 | |
287 | if (dma_map) |
288 | dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL); |
289 | |
290 | free_mem: |
291 | if (token && dma_map) |
292 | dma_free_coherent(iue->target->dev, id->table_desc.len, md, token); |
293 | |
294 | return err; |
295 | } |
296 | |
297 | static int data_out_desc_size(struct srp_cmd *cmd) |
298 | { |
299 | int size = 0; |
300 | u8 fmt = cmd->buf_fmt >> 4; |
301 | |
302 | switch (fmt) { |
303 | case SRP_NO_DATA_DESC: |
304 | break; |
305 | case SRP_DATA_DESC_DIRECT: |
306 | size = sizeof(struct srp_direct_buf); |
307 | break; |
308 | case SRP_DATA_DESC_INDIRECT: |
309 | size = sizeof(struct srp_indirect_buf) + |
310 | sizeof(struct srp_direct_buf) * cmd->data_out_desc_cnt; |
311 | break; |
312 | default: |
313 | eprintk("client error. Invalid data_out_format %x\n", fmt); |
314 | break; |
315 | } |
316 | return size; |
317 | } |
318 | |
319 | /* |
320 | * TODO: this can be called multiple times for a single command if it |
321 | * has very long data. |
322 | */ |
323 | int srp_transfer_data(struct scsi_cmnd *sc, struct srp_cmd *cmd, |
324 | srp_rdma_t rdma_io, int dma_map, int ext_desc) |
325 | { |
326 | struct srp_direct_buf *md; |
327 | struct srp_indirect_buf *id; |
328 | enum dma_data_direction dir; |
329 | int offset, err = 0; |
330 | u8 format; |
331 | |
332 | offset = cmd->add_cdb_len & ~3; |
333 | |
334 | dir = srp_cmd_direction(cmd); |
335 | if (dir == DMA_FROM_DEVICE) |
336 | offset += data_out_desc_size(cmd); |
337 | |
338 | if (dir == DMA_TO_DEVICE) |
339 | format = cmd->buf_fmt >> 4; |
340 | else |
341 | format = cmd->buf_fmt & ((1U << 4) - 1); |
342 | |
343 | switch (format) { |
344 | case SRP_NO_DATA_DESC: |
345 | break; |
346 | case SRP_DATA_DESC_DIRECT: |
347 | md = (struct srp_direct_buf *) |
348 | (cmd->add_data + offset); |
349 | err = srp_direct_data(sc, md, dir, rdma_io, dma_map, ext_desc); |
350 | break; |
351 | case SRP_DATA_DESC_INDIRECT: |
352 | id = (struct srp_indirect_buf *) |
353 | (cmd->add_data + offset); |
354 | err = srp_indirect_data(sc, cmd, id, dir, rdma_io, dma_map, |
355 | ext_desc); |
356 | break; |
357 | default: |
358 | eprintk("Unknown format %d %x\n", dir, format); |
359 | err = -EINVAL; |
360 | } |
361 | |
362 | return err; |
363 | } |
364 | EXPORT_SYMBOL_GPL(srp_transfer_data); |
365 | |
366 | static int vscsis_data_length(struct srp_cmd *cmd, enum dma_data_direction dir) |
367 | { |
368 | struct srp_direct_buf *md; |
369 | struct srp_indirect_buf *id; |
370 | int len = 0, offset = cmd->add_cdb_len & ~3; |
371 | u8 fmt; |
372 | |
373 | if (dir == DMA_TO_DEVICE) |
374 | fmt = cmd->buf_fmt >> 4; |
375 | else { |
376 | fmt = cmd->buf_fmt & ((1U << 4) - 1); |
377 | offset += data_out_desc_size(cmd); |
378 | } |
379 | |
380 | switch (fmt) { |
381 | case SRP_NO_DATA_DESC: |
382 | break; |
383 | case SRP_DATA_DESC_DIRECT: |
384 | md = (struct srp_direct_buf *) (cmd->add_data + offset); |
385 | len = md->len; |
386 | break; |
387 | case SRP_DATA_DESC_INDIRECT: |
388 | id = (struct srp_indirect_buf *) (cmd->add_data + offset); |
389 | len = id->len; |
390 | break; |
391 | default: |
392 | eprintk("invalid data format %x\n", fmt); |
393 | break; |
394 | } |
395 | return len; |
396 | } |
397 | |
398 | int srp_cmd_queue(struct Scsi_Host *shost, struct srp_cmd *cmd, void *info, |
399 | u64 itn_id, u64 addr) |
400 | { |
401 | enum dma_data_direction dir; |
402 | struct scsi_cmnd *sc; |
403 | int tag, len, err; |
404 | |
405 | switch (cmd->task_attr) { |
406 | case SRP_SIMPLE_TASK: |
407 | tag = MSG_SIMPLE_TAG; |
408 | break; |
409 | case SRP_ORDERED_TASK: |
410 | tag = MSG_ORDERED_TAG; |
411 | break; |
412 | case SRP_HEAD_TASK: |
413 | tag = MSG_HEAD_TAG; |
414 | break; |
415 | default: |
416 | eprintk("Task attribute %d not supported\n", cmd->task_attr); |
417 | tag = MSG_ORDERED_TAG; |
418 | } |
419 | |
420 | dir = srp_cmd_direction(cmd); |
421 | len = vscsis_data_length(cmd, dir); |
422 | |
423 | dprintk("%p %x %lx %d %d %d %llx\n", info, cmd->cdb[0], |
424 | cmd->lun, dir, len, tag, (unsigned long long) cmd->tag); |
425 | |
426 | sc = scsi_host_get_command(shost, dir, GFP_KERNEL); |
427 | if (!sc) |
428 | return -ENOMEM; |
429 | |
430 | sc->SCp.ptr = info; |
431 | memcpy(sc->cmnd, cmd->cdb, MAX_COMMAND_SIZE); |
432 | sc->sdb.length = len; |
433 | sc->sdb.table.sgl = (void *) (unsigned long) addr; |
434 | sc->tag = tag; |
435 | err = scsi_tgt_queue_command(sc, itn_id, (struct scsi_lun *)&cmd->lun, |
436 | cmd->tag); |
437 | if (err) |
438 | scsi_host_put_command(shost, sc); |
439 | |
440 | return err; |
441 | } |
442 | EXPORT_SYMBOL_GPL(srp_cmd_queue); |
443 | |
444 | MODULE_DESCRIPTION("SCSI RDMA Protocol lib functions"); |
445 | MODULE_AUTHOR("FUJITA Tomonori"); |
446 | MODULE_LICENSE("GPL"); |
447 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9