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[FreeBSD/releng/10.3.git] / sys / cam / ctl / ctl_tpc_local.c
1 /*-
2  * Copyright (c) 2014 Alexander Motin <mav@FreeBSD.org>
3  * Copyright (c) 2004, 2005 Silicon Graphics International Corp.
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer,
11  *    without modification, immediately at the beginning of the file.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/types.h>
35 #include <sys/lock.h>
36 #include <sys/module.h>
37 #include <sys/mutex.h>
38 #include <sys/condvar.h>
39 #include <sys/malloc.h>
40 #include <sys/conf.h>
41 #include <sys/queue.h>
42 #include <sys/sysctl.h>
43
44 #include <cam/cam.h>
45 #include <cam/scsi/scsi_all.h>
46 #include <cam/scsi/scsi_da.h>
47 #include <cam/ctl/ctl_io.h>
48 #include <cam/ctl/ctl.h>
49 #include <cam/ctl/ctl_frontend.h>
50 #include <cam/ctl/ctl_util.h>
51 #include <cam/ctl/ctl_backend.h>
52 #include <cam/ctl/ctl_ioctl.h>
53 #include <cam/ctl/ctl_ha.h>
54 #include <cam/ctl/ctl_private.h>
55 #include <cam/ctl/ctl_debug.h>
56 #include <cam/ctl/ctl_scsi_all.h>
57 #include <cam/ctl/ctl_tpc.h>
58 #include <cam/ctl/ctl_error.h>
59
60 struct tpcl_softc {
61         struct ctl_port port;
62         int cur_tag_num;
63 };
64
65 static struct tpcl_softc tpcl_softc;
66
67 static int tpcl_init(void);
68 static void tpcl_shutdown(void);
69 static void tpcl_datamove(union ctl_io *io);
70 static void tpcl_done(union ctl_io *io);
71
72
73 static struct ctl_frontend tpcl_frontend =
74 {
75         .name = "tpc",
76         .init = tpcl_init,
77         .shutdown = tpcl_shutdown,
78 };
79 CTL_FRONTEND_DECLARE(ctltpc, tpcl_frontend);
80
81 static int
82 tpcl_init(void)
83 {
84         struct tpcl_softc *tsoftc = &tpcl_softc;
85         struct ctl_port *port;
86         struct scsi_transportid_spi *tid;
87         int len;
88
89         memset(tsoftc, 0, sizeof(*tsoftc));
90
91         port = &tsoftc->port;
92         port->frontend = &tpcl_frontend;
93         port->port_type = CTL_PORT_INTERNAL;
94         port->num_requested_ctl_io = 100;
95         port->port_name = "tpc";
96         port->fe_datamove = tpcl_datamove;
97         port->fe_done = tpcl_done;
98         port->max_targets = 1;
99         port->max_target_id = 0;
100         port->targ_port = -1;
101         port->max_initiators = 1;
102
103         if (ctl_port_register(port) != 0) {
104                 printf("%s: ctl_port_register() failed with error\n", __func__);
105                 return (0);
106         }
107
108         len = sizeof(struct scsi_transportid_spi);
109         port->init_devid = malloc(sizeof(struct ctl_devid) + len,
110             M_CTL, M_WAITOK | M_ZERO);
111         port->init_devid->len = len;
112         tid = (struct scsi_transportid_spi *)port->init_devid->data;
113         tid->format_protocol = SCSI_TRN_SPI_FORMAT_DEFAULT | SCSI_PROTO_SPI;
114         scsi_ulto2b(0, tid->scsi_addr);
115         scsi_ulto2b(port->targ_port, tid->rel_trgt_port_id);
116
117         ctl_port_online(port);
118         return (0);
119 }
120
121 void
122 tpcl_shutdown(void)
123 {
124         struct tpcl_softc *tsoftc = &tpcl_softc;
125         struct ctl_port *port;
126
127         port = &tsoftc->port;
128         ctl_port_offline(port);
129         if (ctl_port_deregister(&tsoftc->port) != 0)
130                 printf("%s: ctl_frontend_deregister() failed\n", __func__);
131 }
132
133 static void
134 tpcl_datamove(union ctl_io *io)
135 {
136         struct ctl_sg_entry *ext_sglist, *kern_sglist;
137         struct ctl_sg_entry ext_entry, kern_entry;
138         int ext_sg_entries, kern_sg_entries;
139         int ext_sg_start, ext_offset;
140         int len_to_copy, len_copied;
141         int kern_watermark, ext_watermark;
142         struct ctl_scsiio *ctsio;
143         int i, j;
144
145         CTL_DEBUG_PRINT(("%s\n", __func__));
146
147         ctsio = &io->scsiio;
148
149         /*
150          * If this is the case, we're probably doing a BBR read and don't
151          * actually need to transfer the data.  This will effectively
152          * bit-bucket the data.
153          */
154         if (ctsio->ext_data_ptr == NULL)
155                 goto bailout;
156
157         /*
158          * To simplify things here, if we have a single buffer, stick it in
159          * a S/G entry and just make it a single entry S/G list.
160          */
161         if (ctsio->ext_sg_entries > 0) {
162                 int len_seen;
163
164                 ext_sglist = (struct ctl_sg_entry *)ctsio->ext_data_ptr;
165                 ext_sg_entries = ctsio->ext_sg_entries;
166                 ext_sg_start = 0;
167                 ext_offset = 0;
168                 len_seen = 0;
169                 for (i = 0; i < ext_sg_entries; i++) {
170                         if ((len_seen + ext_sglist[i].len) >=
171                              ctsio->ext_data_filled) {
172                                 ext_sg_start = i;
173                                 ext_offset = ctsio->ext_data_filled - len_seen;
174                                 break;
175                         }
176                         len_seen += ext_sglist[i].len;
177                 }
178         } else {
179                 ext_sglist = &ext_entry;
180                 ext_sglist->addr = ctsio->ext_data_ptr;
181                 ext_sglist->len = ctsio->ext_data_len;
182                 ext_sg_entries = 1;
183                 ext_sg_start = 0;
184                 ext_offset = ctsio->ext_data_filled;
185         }
186
187         if (ctsio->kern_sg_entries > 0) {
188                 kern_sglist = (struct ctl_sg_entry *)ctsio->kern_data_ptr;
189                 kern_sg_entries = ctsio->kern_sg_entries;
190         } else {
191                 kern_sglist = &kern_entry;
192                 kern_sglist->addr = ctsio->kern_data_ptr;
193                 kern_sglist->len = ctsio->kern_data_len;
194                 kern_sg_entries = 1;
195         }
196
197         kern_watermark = 0;
198         ext_watermark = ext_offset;
199         len_copied = 0;
200         for (i = ext_sg_start, j = 0;
201              i < ext_sg_entries && j < kern_sg_entries;) {
202                 uint8_t *ext_ptr, *kern_ptr;
203
204                 len_to_copy = min(ext_sglist[i].len - ext_watermark,
205                                   kern_sglist[j].len - kern_watermark);
206
207                 ext_ptr = (uint8_t *)ext_sglist[i].addr;
208                 ext_ptr = ext_ptr + ext_watermark;
209                 if (io->io_hdr.flags & CTL_FLAG_BUS_ADDR) {
210                         /*
211                          * XXX KDM fix this!
212                          */
213                         panic("need to implement bus address support");
214 #if 0
215                         kern_ptr = bus_to_virt(kern_sglist[j].addr);
216 #endif
217                 } else
218                         kern_ptr = (uint8_t *)kern_sglist[j].addr;
219                 kern_ptr = kern_ptr + kern_watermark;
220
221                 kern_watermark += len_to_copy;
222                 ext_watermark += len_to_copy;
223                 
224                 if ((ctsio->io_hdr.flags & CTL_FLAG_DATA_MASK) ==
225                      CTL_FLAG_DATA_IN) {
226                         CTL_DEBUG_PRINT(("%s: copying %d bytes to user\n",
227                                          __func__, len_to_copy));
228                         CTL_DEBUG_PRINT(("%s: from %p to %p\n", __func__,
229                                          kern_ptr, ext_ptr));
230                         memcpy(ext_ptr, kern_ptr, len_to_copy);
231                 } else {
232                         CTL_DEBUG_PRINT(("%s: copying %d bytes from user\n",
233                                          __func__, len_to_copy));
234                         CTL_DEBUG_PRINT(("%s: from %p to %p\n", __func__,
235                                          ext_ptr, kern_ptr));
236                         memcpy(kern_ptr, ext_ptr, len_to_copy);
237                 }
238
239                 len_copied += len_to_copy;
240
241                 if (ext_sglist[i].len == ext_watermark) {
242                         i++;
243                         ext_watermark = 0;
244                 }
245
246                 if (kern_sglist[j].len == kern_watermark) {
247                         j++;
248                         kern_watermark = 0;
249                 }
250         }
251
252         ctsio->ext_data_filled += len_copied;
253
254         CTL_DEBUG_PRINT(("%s: ext_sg_entries: %d, kern_sg_entries: %d\n",
255                          __func__, ext_sg_entries, kern_sg_entries));
256         CTL_DEBUG_PRINT(("%s: ext_data_len = %d, kern_data_len = %d\n",
257                          __func__, ctsio->ext_data_len, ctsio->kern_data_len));
258
259         /* XXX KDM set residual?? */
260 bailout:
261         io->scsiio.be_move_done(io);
262 }
263
264 static void
265 tpcl_done(union ctl_io *io)
266 {
267
268         tpc_done(io);
269 }
270
271 uint64_t
272 tpcl_resolve(struct ctl_softc *softc, int init_port,
273     struct scsi_ec_cscd *cscd, uint32_t *ss, uint32_t *ps, uint32_t *pso)
274 {
275         struct scsi_ec_cscd_id *cscdid;
276         struct ctl_port *port;
277         struct ctl_lun *lun;
278         uint64_t lunid = UINT64_MAX;
279
280         if (cscd->type_code != EC_CSCD_ID ||
281             (cscd->luidt_pdt & EC_LUIDT_MASK) != EC_LUIDT_LUN ||
282             (cscd->luidt_pdt & EC_NUL) != 0)
283                 return (lunid);
284
285         cscdid = (struct scsi_ec_cscd_id *)cscd;
286         mtx_lock(&softc->ctl_lock);
287         if (init_port >= 0)
288                 port = softc->ctl_ports[init_port];
289         else
290                 port = NULL;
291         STAILQ_FOREACH(lun, &softc->lun_list, links) {
292                 if (port != NULL &&
293                     ctl_lun_map_to_port(port, lun->lun) >= CTL_MAX_LUNS)
294                         continue;
295                 if (lun->lun_devid == NULL)
296                         continue;
297                 if (scsi_devid_match(lun->lun_devid->data,
298                     lun->lun_devid->len, &cscdid->codeset,
299                     cscdid->length + 4) == 0) {
300                         lunid = lun->lun;
301                         if (ss && lun->be_lun)
302                                 *ss = lun->be_lun->blocksize;
303                         if (ps && lun->be_lun)
304                                 *ps = lun->be_lun->blocksize <<
305                                     lun->be_lun->pblockexp;
306                         if (pso && lun->be_lun)
307                                 *pso = lun->be_lun->blocksize *
308                                     lun->be_lun->pblockoff;
309                         break;
310                 }
311         }
312         mtx_unlock(&softc->ctl_lock);
313         return (lunid);
314 };
315
316 union ctl_io *
317 tpcl_alloc_io(void)
318 {
319         struct tpcl_softc *tsoftc = &tpcl_softc;
320
321         return (ctl_alloc_io(tsoftc->port.ctl_pool_ref));
322 };
323
324 int
325 tpcl_queue(union ctl_io *io, uint64_t lun)
326 {
327         struct tpcl_softc *tsoftc = &tpcl_softc;
328
329         io->io_hdr.nexus.initid = 0;
330         io->io_hdr.nexus.targ_port = tsoftc->port.targ_port;
331         io->io_hdr.nexus.targ_lun = lun;
332         io->scsiio.tag_num = atomic_fetchadd_int(&tsoftc->cur_tag_num, 1);
333         io->scsiio.ext_data_filled = 0;
334         return (ctl_queue(io));
335 }