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1 | /* |
2 | * SCSI target kernel/user interface functions |
3 | * |
4 | * Copyright (C) 2005 FUJITA Tomonori <tomof@acm.org> |
5 | * Copyright (C) 2005 Mike Christie <michaelc@cs.wisc.edu> |
6 | * |
7 | * This program is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU General Public License as |
9 | * published by the Free Software Foundation; either version 2 of the |
10 | * License, or (at your option) any later version. |
11 | * |
12 | * This program is distributed in the hope that it will be useful, but |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | * General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU General Public License |
18 | * along with this program; if not, write to the Free Software |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
20 | * 02110-1301 USA |
21 | */ |
22 | #include <linux/miscdevice.h> |
23 | #include <linux/gfp.h> |
24 | #include <linux/file.h> |
25 | #include <linux/smp_lock.h> |
26 | #include <net/tcp.h> |
27 | #include <scsi/scsi.h> |
28 | #include <scsi/scsi_cmnd.h> |
29 | #include <scsi/scsi_device.h> |
30 | #include <scsi/scsi_host.h> |
31 | #include <scsi/scsi_tgt.h> |
32 | #include <scsi/scsi_tgt_if.h> |
33 | |
34 | #include <asm/cacheflush.h> |
35 | |
36 | #include "scsi_tgt_priv.h" |
37 | |
38 | #if TGT_RING_SIZE < PAGE_SIZE |
39 | # define TGT_RING_SIZE PAGE_SIZE |
40 | #endif |
41 | |
42 | #define TGT_RING_PAGES (TGT_RING_SIZE >> PAGE_SHIFT) |
43 | #define TGT_EVENT_PER_PAGE (PAGE_SIZE / sizeof(struct tgt_event)) |
44 | #define TGT_MAX_EVENTS (TGT_EVENT_PER_PAGE * TGT_RING_PAGES) |
45 | |
46 | struct tgt_ring { |
47 | u32 tr_idx; |
48 | unsigned long tr_pages[TGT_RING_PAGES]; |
49 | spinlock_t tr_lock; |
50 | }; |
51 | |
52 | /* tx_ring : kernel->user, rx_ring : user->kernel */ |
53 | static struct tgt_ring tx_ring, rx_ring; |
54 | static DECLARE_WAIT_QUEUE_HEAD(tgt_poll_wait); |
55 | |
56 | static inline void tgt_ring_idx_inc(struct tgt_ring *ring) |
57 | { |
58 | if (ring->tr_idx == TGT_MAX_EVENTS - 1) |
59 | ring->tr_idx = 0; |
60 | else |
61 | ring->tr_idx++; |
62 | } |
63 | |
64 | static struct tgt_event *tgt_head_event(struct tgt_ring *ring, u32 idx) |
65 | { |
66 | u32 pidx, off; |
67 | |
68 | pidx = idx / TGT_EVENT_PER_PAGE; |
69 | off = idx % TGT_EVENT_PER_PAGE; |
70 | |
71 | return (struct tgt_event *) |
72 | (ring->tr_pages[pidx] + sizeof(struct tgt_event) * off); |
73 | } |
74 | |
75 | static int tgt_uspace_send_event(u32 type, struct tgt_event *p) |
76 | { |
77 | struct tgt_event *ev; |
78 | struct tgt_ring *ring = &tx_ring; |
79 | unsigned long flags; |
80 | int err = 0; |
81 | |
82 | spin_lock_irqsave(&ring->tr_lock, flags); |
83 | |
84 | ev = tgt_head_event(ring, ring->tr_idx); |
85 | if (!ev->hdr.status) |
86 | tgt_ring_idx_inc(ring); |
87 | else |
88 | err = -BUSY; |
89 | |
90 | spin_unlock_irqrestore(&ring->tr_lock, flags); |
91 | |
92 | if (err) |
93 | return err; |
94 | |
95 | memcpy(ev, p, sizeof(*ev)); |
96 | ev->hdr.type = type; |
97 | mb(); |
98 | ev->hdr.status = 1; |
99 | |
100 | flush_dcache_page(virt_to_page(ev)); |
101 | |
102 | wake_up_interruptible(&tgt_poll_wait); |
103 | |
104 | return 0; |
105 | } |
106 | |
107 | int scsi_tgt_uspace_send_cmd(struct scsi_cmnd *cmd, u64 itn_id, |
108 | struct scsi_lun *lun, u64 tag) |
109 | { |
110 | struct Scsi_Host *shost = scsi_tgt_cmd_to_host(cmd); |
111 | struct tgt_event ev; |
112 | int err; |
113 | |
114 | memset(&ev, 0, sizeof(ev)); |
115 | ev.p.cmd_req.host_no = shost->host_no; |
116 | ev.p.cmd_req.itn_id = itn_id; |
117 | ev.p.cmd_req.data_len = scsi_bufflen(cmd); |
118 | memcpy(ev.p.cmd_req.scb, cmd->cmnd, sizeof(ev.p.cmd_req.scb)); |
119 | memcpy(ev.p.cmd_req.lun, lun, sizeof(ev.p.cmd_req.lun)); |
120 | ev.p.cmd_req.attribute = cmd->tag; |
121 | ev.p.cmd_req.tag = tag; |
122 | |
123 | dprintk("%p %d %u %x %llx\n", cmd, shost->host_no, |
124 | ev.p.cmd_req.data_len, cmd->tag, |
125 | (unsigned long long) ev.p.cmd_req.tag); |
126 | |
127 | err = tgt_uspace_send_event(TGT_KEVENT_CMD_REQ, &ev); |
128 | if (err) |
129 | eprintk("tx buf is full, could not send\n"); |
130 | |
131 | return err; |
132 | } |
133 | |
134 | int scsi_tgt_uspace_send_status(struct scsi_cmnd *cmd, u64 itn_id, u64 tag) |
135 | { |
136 | struct Scsi_Host *shost = scsi_tgt_cmd_to_host(cmd); |
137 | struct tgt_event ev; |
138 | int err; |
139 | |
140 | memset(&ev, 0, sizeof(ev)); |
141 | ev.p.cmd_done.host_no = shost->host_no; |
142 | ev.p.cmd_done.itn_id = itn_id; |
143 | ev.p.cmd_done.tag = tag; |
144 | ev.p.cmd_done.result = cmd->result; |
145 | |
146 | dprintk("%p %d %llu %u %x\n", cmd, shost->host_no, |
147 | (unsigned long long) ev.p.cmd_req.tag, |
148 | ev.p.cmd_req.data_len, cmd->tag); |
149 | |
150 | err = tgt_uspace_send_event(TGT_KEVENT_CMD_DONE, &ev); |
151 | if (err) |
152 | eprintk("tx buf is full, could not send\n"); |
153 | |
154 | return err; |
155 | } |
156 | |
157 | int scsi_tgt_uspace_send_tsk_mgmt(int host_no, u64 itn_id, int function, |
158 | u64 tag, struct scsi_lun *scsilun, void *data) |
159 | { |
160 | struct tgt_event ev; |
161 | int err; |
162 | |
163 | memset(&ev, 0, sizeof(ev)); |
164 | ev.p.tsk_mgmt_req.host_no = host_no; |
165 | ev.p.tsk_mgmt_req.itn_id = itn_id; |
166 | ev.p.tsk_mgmt_req.function = function; |
167 | ev.p.tsk_mgmt_req.tag = tag; |
168 | memcpy(ev.p.tsk_mgmt_req.lun, scsilun, sizeof(ev.p.tsk_mgmt_req.lun)); |
169 | ev.p.tsk_mgmt_req.mid = (u64) (unsigned long) data; |
170 | |
171 | dprintk("%d %x %llx %llx\n", host_no, function, (unsigned long long) tag, |
172 | (unsigned long long) ev.p.tsk_mgmt_req.mid); |
173 | |
174 | err = tgt_uspace_send_event(TGT_KEVENT_TSK_MGMT_REQ, &ev); |
175 | if (err) |
176 | eprintk("tx buf is full, could not send\n"); |
177 | |
178 | return err; |
179 | } |
180 | |
181 | int scsi_tgt_uspace_send_it_nexus_request(int host_no, u64 itn_id, |
182 | int function, char *initiator_id) |
183 | { |
184 | struct tgt_event ev; |
185 | int err; |
186 | |
187 | memset(&ev, 0, sizeof(ev)); |
188 | ev.p.it_nexus_req.host_no = host_no; |
189 | ev.p.it_nexus_req.function = function; |
190 | ev.p.it_nexus_req.itn_id = itn_id; |
191 | if (initiator_id) |
192 | strncpy(ev.p.it_nexus_req.initiator_id, initiator_id, |
193 | sizeof(ev.p.it_nexus_req.initiator_id)); |
194 | |
195 | dprintk("%d %x %llx\n", host_no, function, (unsigned long long)itn_id); |
196 | |
197 | err = tgt_uspace_send_event(TGT_KEVENT_IT_NEXUS_REQ, &ev); |
198 | if (err) |
199 | eprintk("tx buf is full, could not send\n"); |
200 | |
201 | return err; |
202 | } |
203 | |
204 | static int event_recv_msg(struct tgt_event *ev) |
205 | { |
206 | int err = 0; |
207 | |
208 | switch (ev->hdr.type) { |
209 | case TGT_UEVENT_CMD_RSP: |
210 | err = scsi_tgt_kspace_exec(ev->p.cmd_rsp.host_no, |
211 | ev->p.cmd_rsp.itn_id, |
212 | ev->p.cmd_rsp.result, |
213 | ev->p.cmd_rsp.tag, |
214 | ev->p.cmd_rsp.uaddr, |
215 | ev->p.cmd_rsp.len, |
216 | ev->p.cmd_rsp.sense_uaddr, |
217 | ev->p.cmd_rsp.sense_len, |
218 | ev->p.cmd_rsp.rw); |
219 | break; |
220 | case TGT_UEVENT_TSK_MGMT_RSP: |
221 | err = scsi_tgt_kspace_tsk_mgmt(ev->p.tsk_mgmt_rsp.host_no, |
222 | ev->p.tsk_mgmt_rsp.itn_id, |
223 | ev->p.tsk_mgmt_rsp.mid, |
224 | ev->p.tsk_mgmt_rsp.result); |
225 | break; |
226 | case TGT_UEVENT_IT_NEXUS_RSP: |
227 | err = scsi_tgt_kspace_it_nexus_rsp(ev->p.it_nexus_rsp.host_no, |
228 | ev->p.it_nexus_rsp.itn_id, |
229 | ev->p.it_nexus_rsp.result); |
230 | break; |
231 | default: |
232 | eprintk("unknown type %d\n", ev->hdr.type); |
233 | err = -EINVAL; |
234 | } |
235 | |
236 | return err; |
237 | } |
238 | |
239 | static ssize_t tgt_write(struct file *file, const char __user * buffer, |
240 | size_t count, loff_t * ppos) |
241 | { |
242 | struct tgt_event *ev; |
243 | struct tgt_ring *ring = &rx_ring; |
244 | |
245 | while (1) { |
246 | ev = tgt_head_event(ring, ring->tr_idx); |
247 | /* do we need this? */ |
248 | flush_dcache_page(virt_to_page(ev)); |
249 | |
250 | if (!ev->hdr.status) |
251 | break; |
252 | |
253 | tgt_ring_idx_inc(ring); |
254 | event_recv_msg(ev); |
255 | ev->hdr.status = 0; |
256 | }; |
257 | |
258 | return count; |
259 | } |
260 | |
261 | static unsigned int tgt_poll(struct file * file, struct poll_table_struct *wait) |
262 | { |
263 | struct tgt_event *ev; |
264 | struct tgt_ring *ring = &tx_ring; |
265 | unsigned long flags; |
266 | unsigned int mask = 0; |
267 | u32 idx; |
268 | |
269 | poll_wait(file, &tgt_poll_wait, wait); |
270 | |
271 | spin_lock_irqsave(&ring->tr_lock, flags); |
272 | |
273 | idx = ring->tr_idx ? ring->tr_idx - 1 : TGT_MAX_EVENTS - 1; |
274 | ev = tgt_head_event(ring, idx); |
275 | if (ev->hdr.status) |
276 | mask |= POLLIN | POLLRDNORM; |
277 | |
278 | spin_unlock_irqrestore(&ring->tr_lock, flags); |
279 | |
280 | return mask; |
281 | } |
282 | |
283 | static int uspace_ring_map(struct vm_area_struct *vma, unsigned long addr, |
284 | struct tgt_ring *ring) |
285 | { |
286 | int i, err; |
287 | |
288 | for (i = 0; i < TGT_RING_PAGES; i++) { |
289 | struct page *page = virt_to_page(ring->tr_pages[i]); |
290 | err = vm_insert_page(vma, addr, page); |
291 | if (err) |
292 | return err; |
293 | addr += PAGE_SIZE; |
294 | } |
295 | |
296 | return 0; |
297 | } |
298 | |
299 | static int tgt_mmap(struct file *filp, struct vm_area_struct *vma) |
300 | { |
301 | unsigned long addr; |
302 | int err; |
303 | |
304 | if (vma->vm_pgoff) |
305 | return -EINVAL; |
306 | |
307 | if (vma->vm_end - vma->vm_start != TGT_RING_SIZE * 2) { |
308 | eprintk("mmap size must be %lu, not %lu \n", |
309 | TGT_RING_SIZE * 2, vma->vm_end - vma->vm_start); |
310 | return -EINVAL; |
311 | } |
312 | |
313 | addr = vma->vm_start; |
314 | err = uspace_ring_map(vma, addr, &tx_ring); |
315 | if (err) |
316 | return err; |
317 | err = uspace_ring_map(vma, addr + TGT_RING_SIZE, &rx_ring); |
318 | |
319 | return err; |
320 | } |
321 | |
322 | static int tgt_open(struct inode *inode, struct file *file) |
323 | { |
324 | tx_ring.tr_idx = rx_ring.tr_idx = 0; |
325 | |
326 | cycle_kernel_lock(); |
327 | return 0; |
328 | } |
329 | |
330 | static const struct file_operations tgt_fops = { |
331 | .owner = THIS_MODULE, |
332 | .open = tgt_open, |
333 | .poll = tgt_poll, |
334 | .write = tgt_write, |
335 | .mmap = tgt_mmap, |
336 | }; |
337 | |
338 | static struct miscdevice tgt_miscdev = { |
339 | .minor = MISC_DYNAMIC_MINOR, |
340 | .name = "tgt", |
341 | .fops = &tgt_fops, |
342 | }; |
343 | |
344 | static void tgt_ring_exit(struct tgt_ring *ring) |
345 | { |
346 | int i; |
347 | |
348 | for (i = 0; i < TGT_RING_PAGES; i++) |
349 | free_page(ring->tr_pages[i]); |
350 | } |
351 | |
352 | static int tgt_ring_init(struct tgt_ring *ring) |
353 | { |
354 | int i; |
355 | |
356 | spin_lock_init(&ring->tr_lock); |
357 | |
358 | for (i = 0; i < TGT_RING_PAGES; i++) { |
359 | ring->tr_pages[i] = get_zeroed_page(GFP_KERNEL); |
360 | if (!ring->tr_pages[i]) { |
361 | eprintk("out of memory\n"); |
362 | return -ENOMEM; |
363 | } |
364 | } |
365 | |
366 | return 0; |
367 | } |
368 | |
369 | void scsi_tgt_if_exit(void) |
370 | { |
371 | tgt_ring_exit(&tx_ring); |
372 | tgt_ring_exit(&rx_ring); |
373 | misc_deregister(&tgt_miscdev); |
374 | } |
375 | |
376 | int scsi_tgt_if_init(void) |
377 | { |
378 | int err; |
379 | |
380 | err = tgt_ring_init(&tx_ring); |
381 | if (err) |
382 | return err; |
383 | |
384 | err = tgt_ring_init(&rx_ring); |
385 | if (err) |
386 | goto free_tx_ring; |
387 | |
388 | err = misc_register(&tgt_miscdev); |
389 | if (err) |
390 | goto free_rx_ring; |
391 | |
392 | return 0; |
393 | free_rx_ring: |
394 | tgt_ring_exit(&rx_ring); |
395 | free_tx_ring: |
396 | tgt_ring_exit(&tx_ring); |
397 | |
398 | return err; |
399 | } |
400 |
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