1 | /* $NetBSD: virtio.c,v 1.18 2016/09/27 03:33:32 pgoyette Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 2010 Minoura Makoto. |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
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 | __KERNEL_RCSID(0, "$NetBSD: virtio.c,v 1.18 2016/09/27 03:33:32 pgoyette Exp $" ); |
30 | |
31 | #include <sys/param.h> |
32 | #include <sys/systm.h> |
33 | #include <sys/kernel.h> |
34 | #include <sys/atomic.h> |
35 | #include <sys/bus.h> |
36 | #include <sys/device.h> |
37 | #include <sys/kmem.h> |
38 | #include <sys/module.h> |
39 | |
40 | #include <dev/pci/pcidevs.h> |
41 | #include <dev/pci/pcireg.h> |
42 | #include <dev/pci/pcivar.h> |
43 | |
44 | #include <dev/pci/virtioreg.h> |
45 | #include <dev/pci/virtiovar.h> |
46 | |
47 | #define MINSEG_INDIRECT 2 /* use indirect if nsegs >= this value */ |
48 | |
49 | static int virtio_match(device_t, cfdata_t, void *); |
50 | static void virtio_attach(device_t, device_t, void *); |
51 | static int virtio_rescan(device_t, const char *, const int *); |
52 | static int virtio_detach(device_t, int); |
53 | static int virtio_intr(void *arg); |
54 | static int virtio_msix_queue_intr(void *); |
55 | static int virtio_msix_config_intr(void *); |
56 | static int virtio_setup_msix_vectors(struct virtio_softc *); |
57 | static int virtio_setup_msix_interrupts(struct virtio_softc *, |
58 | struct pci_attach_args *); |
59 | static int virtio_setup_intx_interrupt(struct virtio_softc *, |
60 | struct pci_attach_args *); |
61 | static int virtio_setup_interrupts(struct virtio_softc *); |
62 | static void virtio_soft_intr(void *arg); |
63 | static void virtio_init_vq(struct virtio_softc *, |
64 | struct virtqueue *, const bool); |
65 | |
66 | CFATTACH_DECL3_NEW(virtio, sizeof(struct virtio_softc), |
67 | virtio_match, virtio_attach, virtio_detach, NULL, virtio_rescan, NULL, |
68 | DVF_DETACH_SHUTDOWN); |
69 | |
70 | static void |
71 | virtio_set_status(struct virtio_softc *sc, int status) |
72 | { |
73 | int old = 0; |
74 | |
75 | if (status != 0) |
76 | old = bus_space_read_1(sc->sc_iot, sc->sc_ioh, |
77 | VIRTIO_CONFIG_DEVICE_STATUS); |
78 | bus_space_write_1(sc->sc_iot, sc->sc_ioh, VIRTIO_CONFIG_DEVICE_STATUS, |
79 | status|old); |
80 | } |
81 | |
82 | #define virtio_device_reset(sc) virtio_set_status((sc), 0) |
83 | |
84 | static int |
85 | virtio_match(device_t parent, cfdata_t match, void *aux) |
86 | { |
87 | struct pci_attach_args *pa; |
88 | |
89 | pa = (struct pci_attach_args *)aux; |
90 | switch (PCI_VENDOR(pa->pa_id)) { |
91 | case PCI_VENDOR_QUMRANET: |
92 | if ((PCI_PRODUCT_QUMRANET_VIRTIO_1000 <= |
93 | PCI_PRODUCT(pa->pa_id)) && |
94 | (PCI_PRODUCT(pa->pa_id) <= |
95 | PCI_PRODUCT_QUMRANET_VIRTIO_103F)) |
96 | return 1; |
97 | break; |
98 | } |
99 | |
100 | return 0; |
101 | } |
102 | |
103 | static const char *virtio_device_name[] = { |
104 | "Unknown (0)" , /* 0 */ |
105 | "Network" , /* 1 */ |
106 | "Block" , /* 2 */ |
107 | "Console" , /* 3 */ |
108 | "Entropy" , /* 4 */ |
109 | "Memory Balloon" , /* 5 */ |
110 | "I/O Memory" , /* 6 */ |
111 | "Remote Processor Messaging" , /* 7 */ |
112 | "SCSI" , /* 8 */ |
113 | "9P Transport" , /* 9 */ |
114 | "mac80211 wlan" , /* 10 */ |
115 | }; |
116 | #define NDEVNAMES __arraycount(virtio_device_name) |
117 | |
118 | #define VIRTIO_MSIX_CONFIG_VECTOR_INDEX 0 |
119 | #define VIRTIO_MSIX_QUEUE_VECTOR_INDEX 1 |
120 | |
121 | static int |
122 | virtio_setup_msix_vectors(struct virtio_softc *sc) |
123 | { |
124 | int offset, vector, ret, qid; |
125 | |
126 | offset = VIRTIO_CONFIG_MSI_CONFIG_VECTOR; |
127 | vector = VIRTIO_MSIX_CONFIG_VECTOR_INDEX; |
128 | |
129 | bus_space_write_2(sc->sc_iot, sc->sc_ioh, offset, vector); |
130 | ret = bus_space_read_2(sc->sc_iot, sc->sc_ioh, offset); |
131 | aprint_debug_dev(sc->sc_dev, "expected=%d, actual=%d\n" , |
132 | vector, ret); |
133 | if (ret != vector) |
134 | return -1; |
135 | |
136 | for (qid = 0; qid < sc->sc_nvqs; qid++) { |
137 | offset = VIRTIO_CONFIG_QUEUE_SELECT; |
138 | bus_space_write_2(sc->sc_iot, sc->sc_ioh, offset, qid); |
139 | |
140 | offset = VIRTIO_CONFIG_MSI_QUEUE_VECTOR; |
141 | vector = VIRTIO_MSIX_QUEUE_VECTOR_INDEX; |
142 | |
143 | bus_space_write_2(sc->sc_iot, sc->sc_ioh, offset, vector); |
144 | ret = bus_space_read_2(sc->sc_iot, sc->sc_ioh, offset); |
145 | aprint_debug_dev(sc->sc_dev, "expected=%d, actual=%d\n" , |
146 | vector, ret); |
147 | if (ret != vector) |
148 | return -1; |
149 | } |
150 | |
151 | return 0; |
152 | } |
153 | |
154 | static int |
155 | virtio_setup_msix_interrupts(struct virtio_softc *sc, |
156 | struct pci_attach_args *pa) |
157 | { |
158 | device_t self = sc->sc_dev; |
159 | pci_chipset_tag_t pc = pa->pa_pc; |
160 | char intrbuf[PCI_INTRSTR_LEN]; |
161 | char const *intrstr; |
162 | int idx; |
163 | |
164 | idx = VIRTIO_MSIX_CONFIG_VECTOR_INDEX; |
165 | if (sc->sc_flags & VIRTIO_F_PCI_INTR_MPSAFE) |
166 | pci_intr_setattr(pc, &sc->sc_ihp[idx], PCI_INTR_MPSAFE, true); |
167 | |
168 | sc->sc_ihs[idx] = pci_intr_establish_xname(pc, sc->sc_ihp[idx], IPL_NET, |
169 | virtio_msix_config_intr, sc, device_xname(sc->sc_dev)); |
170 | if (sc->sc_ihs[idx] == NULL) { |
171 | aprint_error_dev(self, "couldn't establish MSI-X for config\n" ); |
172 | goto error; |
173 | } |
174 | |
175 | idx = VIRTIO_MSIX_QUEUE_VECTOR_INDEX; |
176 | if (sc->sc_flags & VIRTIO_F_PCI_INTR_MPSAFE) |
177 | pci_intr_setattr(pc, &sc->sc_ihp[idx], PCI_INTR_MPSAFE, true); |
178 | |
179 | sc->sc_ihs[idx] = pci_intr_establish_xname(pc, sc->sc_ihp[idx], IPL_NET, |
180 | virtio_msix_queue_intr, sc, device_xname(sc->sc_dev)); |
181 | if (sc->sc_ihs[idx] == NULL) { |
182 | aprint_error_dev(self, "couldn't establish MSI-X for queues\n" ); |
183 | goto error; |
184 | } |
185 | |
186 | if (virtio_setup_msix_vectors(sc) != 0) { |
187 | aprint_error_dev(self, "couldn't setup MSI-X vectors\n" ); |
188 | goto error; |
189 | } |
190 | |
191 | idx = VIRTIO_MSIX_CONFIG_VECTOR_INDEX; |
192 | intrstr = pci_intr_string(pc, sc->sc_ihp[idx], intrbuf, sizeof(intrbuf)); |
193 | aprint_normal_dev(self, "config interrupting at %s\n" , intrstr); |
194 | idx = VIRTIO_MSIX_QUEUE_VECTOR_INDEX; |
195 | intrstr = pci_intr_string(pc, sc->sc_ihp[idx], intrbuf, sizeof(intrbuf)); |
196 | aprint_normal_dev(self, "queues interrupting at %s\n" , intrstr); |
197 | |
198 | return 0; |
199 | |
200 | error: |
201 | idx = VIRTIO_MSIX_CONFIG_VECTOR_INDEX; |
202 | if (sc->sc_ihs[idx] != NULL) |
203 | pci_intr_disestablish(sc->sc_pc, sc->sc_ihs[idx]); |
204 | idx = VIRTIO_MSIX_QUEUE_VECTOR_INDEX; |
205 | if (sc->sc_ihs[idx] != NULL) |
206 | pci_intr_disestablish(sc->sc_pc, sc->sc_ihs[idx]); |
207 | |
208 | return -1; |
209 | } |
210 | |
211 | static int |
212 | virtio_setup_intx_interrupt(struct virtio_softc *sc, |
213 | struct pci_attach_args *pa) |
214 | { |
215 | device_t self = sc->sc_dev; |
216 | pci_chipset_tag_t pc = pa->pa_pc; |
217 | char intrbuf[PCI_INTRSTR_LEN]; |
218 | char const *intrstr; |
219 | |
220 | if (sc->sc_flags & VIRTIO_F_PCI_INTR_MPSAFE) |
221 | pci_intr_setattr(pc, &sc->sc_ihp[0], PCI_INTR_MPSAFE, true); |
222 | |
223 | sc->sc_ihs[0] = pci_intr_establish_xname(pc, sc->sc_ihp[0], |
224 | IPL_NET, virtio_intr, sc, device_xname(sc->sc_dev)); |
225 | if (sc->sc_ihs[0] == NULL) { |
226 | aprint_error_dev(self, "couldn't establish INTx\n" ); |
227 | return -1; |
228 | } |
229 | |
230 | intrstr = pci_intr_string(pc, sc->sc_ihp[0], intrbuf, sizeof(intrbuf)); |
231 | aprint_normal_dev(self, "interrupting at %s\n" , intrstr); |
232 | |
233 | return 0; |
234 | } |
235 | |
236 | static int |
237 | virtio_setup_interrupts(struct virtio_softc *sc) |
238 | { |
239 | device_t self = sc->sc_dev; |
240 | pci_chipset_tag_t pc = sc->sc_pa.pa_pc; |
241 | int error; |
242 | int nmsix; |
243 | int counts[PCI_INTR_TYPE_SIZE]; |
244 | pci_intr_type_t max_type; |
245 | |
246 | nmsix = pci_msix_count(sc->sc_pa.pa_pc, sc->sc_pa.pa_tag); |
247 | aprint_debug_dev(self, "pci_msix_count=%d\n" , nmsix); |
248 | |
249 | /* We need at least two: one for config and the other for queues */ |
250 | if ((sc->sc_flags & VIRTIO_F_PCI_INTR_MSIX) == 0 || nmsix < 2) { |
251 | /* Try INTx only */ |
252 | max_type = PCI_INTR_TYPE_INTX; |
253 | counts[PCI_INTR_TYPE_INTX] = 1; |
254 | } else { |
255 | /* Try MSI-X first and INTx second */ |
256 | max_type = PCI_INTR_TYPE_MSIX; |
257 | counts[PCI_INTR_TYPE_MSIX] = 2; |
258 | counts[PCI_INTR_TYPE_MSI] = 0; |
259 | counts[PCI_INTR_TYPE_INTX] = 1; |
260 | } |
261 | |
262 | retry: |
263 | error = pci_intr_alloc(&sc->sc_pa, &sc->sc_ihp, counts, max_type); |
264 | if (error != 0) { |
265 | aprint_error_dev(self, "couldn't map interrupt\n" ); |
266 | return -1; |
267 | } |
268 | |
269 | if (pci_intr_type(pc, sc->sc_ihp[0]) == PCI_INTR_TYPE_MSIX) { |
270 | sc->sc_ihs = kmem_alloc(sizeof(*sc->sc_ihs) * 2, |
271 | KM_SLEEP); |
272 | if (sc->sc_ihs == NULL) { |
273 | pci_intr_release(pc, sc->sc_ihp, 2); |
274 | |
275 | /* Retry INTx */ |
276 | max_type = PCI_INTR_TYPE_INTX; |
277 | counts[PCI_INTR_TYPE_INTX] = 1; |
278 | goto retry; |
279 | } |
280 | |
281 | error = virtio_setup_msix_interrupts(sc, &sc->sc_pa); |
282 | if (error != 0) { |
283 | kmem_free(sc->sc_ihs, sizeof(*sc->sc_ihs) * 2); |
284 | pci_intr_release(pc, sc->sc_ihp, 2); |
285 | |
286 | /* Retry INTx */ |
287 | max_type = PCI_INTR_TYPE_INTX; |
288 | counts[PCI_INTR_TYPE_INTX] = 1; |
289 | goto retry; |
290 | } |
291 | |
292 | sc->sc_ihs_num = 2; |
293 | sc->sc_config_offset = VIRTIO_CONFIG_DEVICE_CONFIG_MSI; |
294 | } else if (pci_intr_type(pc, sc->sc_ihp[0]) == PCI_INTR_TYPE_INTX) { |
295 | sc->sc_ihs = kmem_alloc(sizeof(*sc->sc_ihs) * 1, |
296 | KM_SLEEP); |
297 | if (sc->sc_ihs == NULL) { |
298 | pci_intr_release(pc, sc->sc_ihp, 1); |
299 | return -1; |
300 | } |
301 | |
302 | error = virtio_setup_intx_interrupt(sc, &sc->sc_pa); |
303 | if (error != 0) { |
304 | kmem_free(sc->sc_ihs, sizeof(*sc->sc_ihs) * 1); |
305 | pci_intr_release(pc, sc->sc_ihp, 1); |
306 | return -1; |
307 | } |
308 | |
309 | sc->sc_ihs_num = 1; |
310 | sc->sc_config_offset = VIRTIO_CONFIG_DEVICE_CONFIG_NOMSI; |
311 | } |
312 | |
313 | return 0; |
314 | } |
315 | |
316 | static void |
317 | virtio_attach(device_t parent, device_t self, void *aux) |
318 | { |
319 | struct virtio_softc *sc = device_private(self); |
320 | struct pci_attach_args *pa = (struct pci_attach_args *)aux; |
321 | pci_chipset_tag_t pc = pa->pa_pc; |
322 | pcitag_t tag = pa->pa_tag; |
323 | int revision; |
324 | pcireg_t id; |
325 | |
326 | revision = PCI_REVISION(pa->pa_class); |
327 | if (revision != 0) { |
328 | aprint_normal(": unknown revision 0x%02x; giving up\n" , |
329 | revision); |
330 | return; |
331 | } |
332 | aprint_normal("\n" ); |
333 | aprint_naive("\n" ); |
334 | |
335 | /* subsystem ID shows what I am */ |
336 | id = pci_conf_read(pc, tag, PCI_SUBSYS_ID_REG); |
337 | aprint_normal_dev(self, "Virtio %s Device (rev. 0x%02x)\n" , |
338 | (PCI_SUBSYS_ID(id) < NDEVNAMES? |
339 | virtio_device_name[PCI_SUBSYS_ID(id)] : "Unknown" ), |
340 | revision); |
341 | |
342 | sc->sc_dev = self; |
343 | sc->sc_pc = pc; |
344 | sc->sc_tag = tag; |
345 | sc->sc_iot = pa->pa_iot; |
346 | if (pci_dma64_available(pa)) |
347 | sc->sc_dmat = pa->pa_dmat64; |
348 | else |
349 | sc->sc_dmat = pa->pa_dmat; |
350 | sc->sc_config_offset = VIRTIO_CONFIG_DEVICE_CONFIG_NOMSI; |
351 | |
352 | if (pci_mapreg_map(pa, PCI_MAPREG_START, PCI_MAPREG_TYPE_IO, 0, |
353 | &sc->sc_iot, &sc->sc_ioh, NULL, &sc->sc_iosize)) { |
354 | aprint_error_dev(self, "can't map i/o space\n" ); |
355 | return; |
356 | } |
357 | |
358 | virtio_device_reset(sc); |
359 | virtio_set_status(sc, VIRTIO_CONFIG_DEVICE_STATUS_ACK); |
360 | virtio_set_status(sc, VIRTIO_CONFIG_DEVICE_STATUS_DRIVER); |
361 | |
362 | /* XXX: use softc as aux... */ |
363 | sc->sc_childdevid = PCI_SUBSYS_ID(id); |
364 | sc->sc_child = NULL; |
365 | sc->sc_pa = *pa; |
366 | virtio_rescan(self, "virtio" , 0); |
367 | return; |
368 | } |
369 | |
370 | /* ARGSUSED */ |
371 | static int |
372 | virtio_rescan(device_t self, const char *attr, const int *scan_flags) |
373 | { |
374 | struct virtio_softc *sc; |
375 | int r; |
376 | |
377 | sc = device_private(self); |
378 | if (sc->sc_child) /* Child already attached? */ |
379 | return 0; |
380 | config_found_ia(self, attr, sc, NULL); |
381 | if (sc->sc_child == NULL) { |
382 | aprint_error_dev(self, |
383 | "no matching child driver; not configured\n" ); |
384 | return 0; |
385 | } |
386 | if (sc->sc_child == (void*)1) { /* this shows error */ |
387 | aprint_error_dev(self, |
388 | "virtio configuration failed\n" ); |
389 | virtio_set_status(sc, VIRTIO_CONFIG_DEVICE_STATUS_FAILED); |
390 | return 0; |
391 | } |
392 | |
393 | r = virtio_setup_interrupts(sc); |
394 | if (r != 0) { |
395 | aprint_error_dev(self, "failed to setup interrupts\n" ); |
396 | virtio_set_status(sc, VIRTIO_CONFIG_DEVICE_STATUS_FAILED); |
397 | return 0; |
398 | } |
399 | |
400 | sc->sc_soft_ih = NULL; |
401 | if (sc->sc_flags & VIRTIO_F_PCI_INTR_SOFTINT) { |
402 | u_int flags = SOFTINT_NET; |
403 | if (sc->sc_flags & VIRTIO_F_PCI_INTR_MPSAFE) |
404 | flags |= SOFTINT_MPSAFE; |
405 | |
406 | sc->sc_soft_ih = softint_establish(flags, virtio_soft_intr, sc); |
407 | if (sc->sc_soft_ih == NULL) |
408 | aprint_error(": failed to establish soft interrupt\n" ); |
409 | } |
410 | |
411 | virtio_set_status(sc, VIRTIO_CONFIG_DEVICE_STATUS_DRIVER_OK); |
412 | |
413 | return 0; |
414 | } |
415 | |
416 | static int |
417 | virtio_detach(device_t self, int flags) |
418 | { |
419 | struct virtio_softc *sc = device_private(self); |
420 | int r; |
421 | int i; |
422 | |
423 | if (sc->sc_child != 0 && sc->sc_child != (void*)1) { |
424 | r = config_detach(sc->sc_child, flags); |
425 | if (r) |
426 | return r; |
427 | } |
428 | KASSERT(sc->sc_child == 0 || sc->sc_child == (void*)1); |
429 | KASSERT(sc->sc_vqs == 0); |
430 | for (i = 0; i < sc->sc_ihs_num; i++) { |
431 | if (sc->sc_ihs[i] == NULL) |
432 | continue; |
433 | pci_intr_disestablish(sc->sc_pc, sc->sc_ihs[i]); |
434 | } |
435 | pci_intr_release(sc->sc_pc, sc->sc_ihp, sc->sc_ihs_num); |
436 | if (sc->sc_ihs != NULL) |
437 | kmem_free(sc->sc_ihs, sizeof(*sc->sc_ihs) * sc->sc_ihs_num); |
438 | sc->sc_ihs_num = 0; |
439 | if (sc->sc_iosize) |
440 | bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_iosize); |
441 | sc->sc_iosize = 0; |
442 | |
443 | return 0; |
444 | } |
445 | |
446 | /* |
447 | * Reset the device. |
448 | */ |
449 | /* |
450 | * To reset the device to a known state, do following: |
451 | * virtio_reset(sc); // this will stop the device activity |
452 | * <dequeue finished requests>; // virtio_dequeue() still can be called |
453 | * <revoke pending requests in the vqs if any>; |
454 | * virtio_reinit_begin(sc); // dequeue prohibitted |
455 | * newfeatures = virtio_negotiate_features(sc, requestedfeatures); |
456 | * <some other initialization>; |
457 | * virtio_reinit_end(sc); // device activated; enqueue allowed |
458 | * Once attached, feature negotiation can only be allowed after virtio_reset. |
459 | */ |
460 | void |
461 | virtio_reset(struct virtio_softc *sc) |
462 | { |
463 | virtio_device_reset(sc); |
464 | } |
465 | |
466 | void |
467 | virtio_reinit_start(struct virtio_softc *sc) |
468 | { |
469 | int i; |
470 | |
471 | virtio_set_status(sc, VIRTIO_CONFIG_DEVICE_STATUS_ACK); |
472 | virtio_set_status(sc, VIRTIO_CONFIG_DEVICE_STATUS_DRIVER); |
473 | for (i = 0; i < sc->sc_nvqs; i++) { |
474 | int n; |
475 | struct virtqueue *vq = &sc->sc_vqs[i]; |
476 | bus_space_write_2(sc->sc_iot, sc->sc_ioh, |
477 | VIRTIO_CONFIG_QUEUE_SELECT, |
478 | vq->vq_index); |
479 | n = bus_space_read_2(sc->sc_iot, sc->sc_ioh, |
480 | VIRTIO_CONFIG_QUEUE_SIZE); |
481 | if (n == 0) /* vq disappeared */ |
482 | continue; |
483 | if (n != vq->vq_num) { |
484 | panic("%s: virtqueue size changed, vq index %d\n" , |
485 | device_xname(sc->sc_dev), |
486 | vq->vq_index); |
487 | } |
488 | virtio_init_vq(sc, vq, true); |
489 | bus_space_write_4(sc->sc_iot, sc->sc_ioh, |
490 | VIRTIO_CONFIG_QUEUE_ADDRESS, |
491 | (vq->vq_dmamap->dm_segs[0].ds_addr |
492 | / VIRTIO_PAGE_SIZE)); |
493 | } |
494 | |
495 | /* MSI-X should have more than one handles where INTx has just one */ |
496 | if (sc->sc_ihs_num > 1) { |
497 | if (virtio_setup_msix_vectors(sc) != 0) { |
498 | aprint_error_dev(sc->sc_dev, |
499 | "couldn't setup MSI-X vectors\n" ); |
500 | return; |
501 | } |
502 | } |
503 | } |
504 | |
505 | void |
506 | virtio_reinit_end(struct virtio_softc *sc) |
507 | { |
508 | virtio_set_status(sc, VIRTIO_CONFIG_DEVICE_STATUS_DRIVER_OK); |
509 | } |
510 | |
511 | /* |
512 | * Feature negotiation. |
513 | */ |
514 | uint32_t |
515 | virtio_negotiate_features(struct virtio_softc *sc, uint32_t guest_features) |
516 | { |
517 | uint32_t r; |
518 | |
519 | if (!(device_cfdata(sc->sc_dev)->cf_flags & 1) && |
520 | !(device_cfdata(sc->sc_child)->cf_flags & 1)) /* XXX */ |
521 | guest_features |= VIRTIO_F_RING_INDIRECT_DESC; |
522 | r = bus_space_read_4(sc->sc_iot, sc->sc_ioh, |
523 | VIRTIO_CONFIG_DEVICE_FEATURES); |
524 | r &= guest_features; |
525 | bus_space_write_4(sc->sc_iot, sc->sc_ioh, |
526 | VIRTIO_CONFIG_GUEST_FEATURES, r); |
527 | sc->sc_features = r; |
528 | if (r & VIRTIO_F_RING_INDIRECT_DESC) |
529 | sc->sc_indirect = true; |
530 | else |
531 | sc->sc_indirect = false; |
532 | |
533 | return r; |
534 | } |
535 | |
536 | /* |
537 | * Device configuration registers. |
538 | */ |
539 | uint8_t |
540 | virtio_read_device_config_1(struct virtio_softc *sc, int index) |
541 | { |
542 | return bus_space_read_1(sc->sc_iot, sc->sc_ioh, |
543 | sc->sc_config_offset + index); |
544 | } |
545 | |
546 | uint16_t |
547 | virtio_read_device_config_2(struct virtio_softc *sc, int index) |
548 | { |
549 | return bus_space_read_2(sc->sc_iot, sc->sc_ioh, |
550 | sc->sc_config_offset + index); |
551 | } |
552 | |
553 | uint32_t |
554 | virtio_read_device_config_4(struct virtio_softc *sc, int index) |
555 | { |
556 | return bus_space_read_4(sc->sc_iot, sc->sc_ioh, |
557 | sc->sc_config_offset + index); |
558 | } |
559 | |
560 | uint64_t |
561 | virtio_read_device_config_8(struct virtio_softc *sc, int index) |
562 | { |
563 | uint64_t r; |
564 | |
565 | r = bus_space_read_4(sc->sc_iot, sc->sc_ioh, |
566 | sc->sc_config_offset + index + sizeof(uint32_t)); |
567 | r <<= 32; |
568 | r += bus_space_read_4(sc->sc_iot, sc->sc_ioh, |
569 | sc->sc_config_offset + index); |
570 | return r; |
571 | } |
572 | |
573 | void |
574 | virtio_write_device_config_1(struct virtio_softc *sc, |
575 | int index, uint8_t value) |
576 | { |
577 | bus_space_write_1(sc->sc_iot, sc->sc_ioh, |
578 | sc->sc_config_offset + index, value); |
579 | } |
580 | |
581 | void |
582 | virtio_write_device_config_2(struct virtio_softc *sc, |
583 | int index, uint16_t value) |
584 | { |
585 | bus_space_write_2(sc->sc_iot, sc->sc_ioh, |
586 | sc->sc_config_offset + index, value); |
587 | } |
588 | |
589 | void |
590 | virtio_write_device_config_4(struct virtio_softc *sc, |
591 | int index, uint32_t value) |
592 | { |
593 | bus_space_write_4(sc->sc_iot, sc->sc_ioh, |
594 | sc->sc_config_offset + index, value); |
595 | } |
596 | |
597 | void |
598 | virtio_write_device_config_8(struct virtio_softc *sc, |
599 | int index, uint64_t value) |
600 | { |
601 | bus_space_write_4(sc->sc_iot, sc->sc_ioh, |
602 | sc->sc_config_offset + index, |
603 | value & 0xffffffff); |
604 | bus_space_write_4(sc->sc_iot, sc->sc_ioh, |
605 | sc->sc_config_offset + index + sizeof(uint32_t), |
606 | value >> 32); |
607 | } |
608 | |
609 | /* |
610 | * Interrupt handler. |
611 | */ |
612 | static int |
613 | virtio_intr(void *arg) |
614 | { |
615 | struct virtio_softc *sc = arg; |
616 | int isr, r = 0; |
617 | |
618 | /* check and ack the interrupt */ |
619 | isr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, |
620 | VIRTIO_CONFIG_ISR_STATUS); |
621 | if (isr == 0) |
622 | return 0; |
623 | if ((isr & VIRTIO_CONFIG_ISR_CONFIG_CHANGE) && |
624 | (sc->sc_config_change != NULL)) |
625 | r = (sc->sc_config_change)(sc); |
626 | if (sc->sc_intrhand != NULL) { |
627 | if (sc->sc_soft_ih != NULL) |
628 | softint_schedule(sc->sc_soft_ih); |
629 | else |
630 | r |= (sc->sc_intrhand)(sc); |
631 | } |
632 | |
633 | return r; |
634 | } |
635 | |
636 | static int |
637 | virtio_msix_queue_intr(void *arg) |
638 | { |
639 | struct virtio_softc *sc = arg; |
640 | int r = 0; |
641 | |
642 | if (sc->sc_intrhand != NULL) { |
643 | if (sc->sc_soft_ih != NULL) |
644 | softint_schedule(sc->sc_soft_ih); |
645 | else |
646 | r |= (sc->sc_intrhand)(sc); |
647 | } |
648 | |
649 | return r; |
650 | } |
651 | |
652 | static int |
653 | virtio_msix_config_intr(void *arg) |
654 | { |
655 | struct virtio_softc *sc = arg; |
656 | |
657 | /* TODO: handle events */ |
658 | aprint_debug_dev(sc->sc_dev, "%s\n" , __func__); |
659 | return 1; |
660 | } |
661 | |
662 | static void |
663 | virtio_soft_intr(void *arg) |
664 | { |
665 | struct virtio_softc *sc = arg; |
666 | |
667 | KASSERT(sc->sc_intrhand != NULL); |
668 | |
669 | (sc->sc_intrhand)(sc); |
670 | } |
671 | |
672 | /* |
673 | * dmamap sync operations for a virtqueue. |
674 | */ |
675 | static inline void |
676 | vq_sync_descs(struct virtio_softc *sc, struct virtqueue *vq, int ops) |
677 | { |
678 | /* availoffset == sizeof(vring_desc)*vq_num */ |
679 | bus_dmamap_sync(sc->sc_dmat, vq->vq_dmamap, 0, vq->vq_availoffset, |
680 | ops); |
681 | } |
682 | |
683 | static inline void |
684 | vq_sync_aring(struct virtio_softc *sc, struct virtqueue *vq, int ops) |
685 | { |
686 | bus_dmamap_sync(sc->sc_dmat, vq->vq_dmamap, |
687 | vq->vq_availoffset, |
688 | offsetof(struct vring_avail, ring) |
689 | + vq->vq_num * sizeof(uint16_t), |
690 | ops); |
691 | } |
692 | |
693 | static inline void |
694 | vq_sync_uring(struct virtio_softc *sc, struct virtqueue *vq, int ops) |
695 | { |
696 | bus_dmamap_sync(sc->sc_dmat, vq->vq_dmamap, |
697 | vq->vq_usedoffset, |
698 | offsetof(struct vring_used, ring) |
699 | + vq->vq_num * sizeof(struct vring_used_elem), |
700 | ops); |
701 | } |
702 | |
703 | static inline void |
704 | vq_sync_indirect(struct virtio_softc *sc, struct virtqueue *vq, int slot, |
705 | int ops) |
706 | { |
707 | int offset = vq->vq_indirectoffset |
708 | + sizeof(struct vring_desc) * vq->vq_maxnsegs * slot; |
709 | |
710 | bus_dmamap_sync(sc->sc_dmat, vq->vq_dmamap, |
711 | offset, sizeof(struct vring_desc) * vq->vq_maxnsegs, |
712 | ops); |
713 | } |
714 | |
715 | /* |
716 | * Can be used as sc_intrhand. |
717 | */ |
718 | /* |
719 | * Scan vq, bus_dmamap_sync for the vqs (not for the payload), |
720 | * and calls (*vq_done)() if some entries are consumed. |
721 | */ |
722 | int |
723 | virtio_vq_intr(struct virtio_softc *sc) |
724 | { |
725 | struct virtqueue *vq; |
726 | int i, r = 0; |
727 | |
728 | for (i = 0; i < sc->sc_nvqs; i++) { |
729 | vq = &sc->sc_vqs[i]; |
730 | if (vq->vq_queued) { |
731 | vq->vq_queued = 0; |
732 | vq_sync_aring(sc, vq, BUS_DMASYNC_POSTWRITE); |
733 | } |
734 | vq_sync_uring(sc, vq, BUS_DMASYNC_POSTREAD); |
735 | membar_consumer(); |
736 | if (vq->vq_used_idx != vq->vq_used->idx) { |
737 | if (vq->vq_done) |
738 | r |= (vq->vq_done)(vq); |
739 | } |
740 | } |
741 | |
742 | return r; |
743 | } |
744 | |
745 | /* |
746 | * Start/stop vq interrupt. No guarantee. |
747 | */ |
748 | void |
749 | virtio_stop_vq_intr(struct virtio_softc *sc, struct virtqueue *vq) |
750 | { |
751 | vq->vq_avail->flags |= VRING_AVAIL_F_NO_INTERRUPT; |
752 | vq_sync_aring(sc, vq, BUS_DMASYNC_PREWRITE); |
753 | vq->vq_queued++; |
754 | } |
755 | |
756 | void |
757 | virtio_start_vq_intr(struct virtio_softc *sc, struct virtqueue *vq) |
758 | { |
759 | vq->vq_avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT; |
760 | vq_sync_aring(sc, vq, BUS_DMASYNC_PREWRITE); |
761 | vq->vq_queued++; |
762 | } |
763 | |
764 | /* |
765 | * Initialize vq structure. |
766 | */ |
767 | static void |
768 | virtio_init_vq(struct virtio_softc *sc, struct virtqueue *vq, |
769 | const bool reinit) |
770 | { |
771 | int i, j; |
772 | int vq_size = vq->vq_num; |
773 | |
774 | memset(vq->vq_vaddr, 0, vq->vq_bytesize); |
775 | |
776 | /* build the indirect descriptor chain */ |
777 | if (vq->vq_indirect != NULL) { |
778 | struct vring_desc *vd; |
779 | |
780 | for (i = 0; i < vq_size; i++) { |
781 | vd = vq->vq_indirect; |
782 | vd += vq->vq_maxnsegs * i; |
783 | for (j = 0; j < vq->vq_maxnsegs-1; j++) |
784 | vd[j].next = j + 1; |
785 | } |
786 | } |
787 | |
788 | /* free slot management */ |
789 | SIMPLEQ_INIT(&vq->vq_freelist); |
790 | for (i = 0; i < vq_size; i++) { |
791 | SIMPLEQ_INSERT_TAIL(&vq->vq_freelist, |
792 | &vq->vq_entries[i], qe_list); |
793 | vq->vq_entries[i].qe_index = i; |
794 | } |
795 | if (!reinit) |
796 | mutex_init(&vq->vq_freelist_lock, MUTEX_SPIN, sc->sc_ipl); |
797 | |
798 | /* enqueue/dequeue status */ |
799 | vq->vq_avail_idx = 0; |
800 | vq->vq_used_idx = 0; |
801 | vq->vq_queued = 0; |
802 | if (!reinit) { |
803 | mutex_init(&vq->vq_aring_lock, MUTEX_SPIN, sc->sc_ipl); |
804 | mutex_init(&vq->vq_uring_lock, MUTEX_SPIN, sc->sc_ipl); |
805 | } |
806 | vq_sync_aring(sc, vq, BUS_DMASYNC_PREWRITE); |
807 | vq_sync_uring(sc, vq, BUS_DMASYNC_PREREAD); |
808 | vq->vq_queued++; |
809 | } |
810 | |
811 | /* |
812 | * Allocate/free a vq. |
813 | */ |
814 | int |
815 | virtio_alloc_vq(struct virtio_softc *sc, struct virtqueue *vq, int index, |
816 | int maxsegsize, int maxnsegs, const char *name) |
817 | { |
818 | int vq_size, allocsize1, allocsize2, allocsize3, allocsize = 0; |
819 | int rsegs, r; |
820 | #define VIRTQUEUE_ALIGN(n) (((n)+(VIRTIO_PAGE_SIZE-1))& \ |
821 | ~(VIRTIO_PAGE_SIZE-1)) |
822 | |
823 | memset(vq, 0, sizeof(*vq)); |
824 | |
825 | bus_space_write_2(sc->sc_iot, sc->sc_ioh, |
826 | VIRTIO_CONFIG_QUEUE_SELECT, index); |
827 | vq_size = bus_space_read_2(sc->sc_iot, sc->sc_ioh, |
828 | VIRTIO_CONFIG_QUEUE_SIZE); |
829 | if (vq_size == 0) { |
830 | aprint_error_dev(sc->sc_dev, |
831 | "virtqueue not exist, index %d for %s\n" , |
832 | index, name); |
833 | goto err; |
834 | } |
835 | /* allocsize1: descriptor table + avail ring + pad */ |
836 | allocsize1 = VIRTQUEUE_ALIGN(sizeof(struct vring_desc)*vq_size |
837 | + sizeof(uint16_t)*(2+vq_size)); |
838 | /* allocsize2: used ring + pad */ |
839 | allocsize2 = VIRTQUEUE_ALIGN(sizeof(uint16_t)*2 |
840 | + sizeof(struct vring_used_elem)*vq_size); |
841 | /* allocsize3: indirect table */ |
842 | if (sc->sc_indirect && maxnsegs >= MINSEG_INDIRECT) |
843 | allocsize3 = sizeof(struct vring_desc) * maxnsegs * vq_size; |
844 | else |
845 | allocsize3 = 0; |
846 | allocsize = allocsize1 + allocsize2 + allocsize3; |
847 | |
848 | /* alloc and map the memory */ |
849 | r = bus_dmamem_alloc(sc->sc_dmat, allocsize, VIRTIO_PAGE_SIZE, 0, |
850 | &vq->vq_segs[0], 1, &rsegs, BUS_DMA_NOWAIT); |
851 | if (r != 0) { |
852 | aprint_error_dev(sc->sc_dev, |
853 | "virtqueue %d for %s allocation failed, " |
854 | "error code %d\n" , index, name, r); |
855 | goto err; |
856 | } |
857 | r = bus_dmamem_map(sc->sc_dmat, &vq->vq_segs[0], 1, allocsize, |
858 | &vq->vq_vaddr, BUS_DMA_NOWAIT); |
859 | if (r != 0) { |
860 | aprint_error_dev(sc->sc_dev, |
861 | "virtqueue %d for %s map failed, " |
862 | "error code %d\n" , index, name, r); |
863 | goto err; |
864 | } |
865 | r = bus_dmamap_create(sc->sc_dmat, allocsize, 1, allocsize, 0, |
866 | BUS_DMA_NOWAIT, &vq->vq_dmamap); |
867 | if (r != 0) { |
868 | aprint_error_dev(sc->sc_dev, |
869 | "virtqueue %d for %s dmamap creation failed, " |
870 | "error code %d\n" , index, name, r); |
871 | goto err; |
872 | } |
873 | r = bus_dmamap_load(sc->sc_dmat, vq->vq_dmamap, |
874 | vq->vq_vaddr, allocsize, NULL, BUS_DMA_NOWAIT); |
875 | if (r != 0) { |
876 | aprint_error_dev(sc->sc_dev, |
877 | "virtqueue %d for %s dmamap load failed, " |
878 | "error code %d\n" , index, name, r); |
879 | goto err; |
880 | } |
881 | |
882 | /* set the vq address */ |
883 | bus_space_write_4(sc->sc_iot, sc->sc_ioh, |
884 | VIRTIO_CONFIG_QUEUE_ADDRESS, |
885 | (vq->vq_dmamap->dm_segs[0].ds_addr |
886 | / VIRTIO_PAGE_SIZE)); |
887 | |
888 | /* remember addresses and offsets for later use */ |
889 | vq->vq_owner = sc; |
890 | vq->vq_num = vq_size; |
891 | vq->vq_index = index; |
892 | vq->vq_desc = vq->vq_vaddr; |
893 | vq->vq_availoffset = sizeof(struct vring_desc)*vq_size; |
894 | vq->vq_avail = (void*)(((char*)vq->vq_desc) + vq->vq_availoffset); |
895 | vq->vq_usedoffset = allocsize1; |
896 | vq->vq_used = (void*)(((char*)vq->vq_desc) + vq->vq_usedoffset); |
897 | if (allocsize3 > 0) { |
898 | vq->vq_indirectoffset = allocsize1 + allocsize2; |
899 | vq->vq_indirect = (void*)(((char*)vq->vq_desc) |
900 | + vq->vq_indirectoffset); |
901 | } |
902 | vq->vq_bytesize = allocsize; |
903 | vq->vq_maxsegsize = maxsegsize; |
904 | vq->vq_maxnsegs = maxnsegs; |
905 | |
906 | /* free slot management */ |
907 | vq->vq_entries = kmem_zalloc(sizeof(struct vq_entry)*vq_size, |
908 | KM_NOSLEEP); |
909 | if (vq->vq_entries == NULL) { |
910 | r = ENOMEM; |
911 | goto err; |
912 | } |
913 | |
914 | virtio_init_vq(sc, vq, false); |
915 | |
916 | aprint_verbose_dev(sc->sc_dev, |
917 | "allocated %u byte for virtqueue %d for %s, " |
918 | "size %d\n" , allocsize, index, name, vq_size); |
919 | if (allocsize3 > 0) |
920 | aprint_verbose_dev(sc->sc_dev, |
921 | "using %d byte (%d entries) " |
922 | "indirect descriptors\n" , |
923 | allocsize3, maxnsegs * vq_size); |
924 | return 0; |
925 | |
926 | err: |
927 | bus_space_write_4(sc->sc_iot, sc->sc_ioh, |
928 | VIRTIO_CONFIG_QUEUE_ADDRESS, 0); |
929 | if (vq->vq_dmamap) |
930 | bus_dmamap_destroy(sc->sc_dmat, vq->vq_dmamap); |
931 | if (vq->vq_vaddr) |
932 | bus_dmamem_unmap(sc->sc_dmat, vq->vq_vaddr, allocsize); |
933 | if (vq->vq_segs[0].ds_addr) |
934 | bus_dmamem_free(sc->sc_dmat, &vq->vq_segs[0], 1); |
935 | memset(vq, 0, sizeof(*vq)); |
936 | |
937 | return -1; |
938 | } |
939 | |
940 | int |
941 | virtio_free_vq(struct virtio_softc *sc, struct virtqueue *vq) |
942 | { |
943 | struct vq_entry *qe; |
944 | int i = 0; |
945 | |
946 | /* device must be already deactivated */ |
947 | /* confirm the vq is empty */ |
948 | SIMPLEQ_FOREACH(qe, &vq->vq_freelist, qe_list) { |
949 | i++; |
950 | } |
951 | if (i != vq->vq_num) { |
952 | printf("%s: freeing non-empty vq, index %d\n" , |
953 | device_xname(sc->sc_dev), vq->vq_index); |
954 | return EBUSY; |
955 | } |
956 | |
957 | /* tell device that there's no virtqueue any longer */ |
958 | bus_space_write_2(sc->sc_iot, sc->sc_ioh, |
959 | VIRTIO_CONFIG_QUEUE_SELECT, vq->vq_index); |
960 | bus_space_write_4(sc->sc_iot, sc->sc_ioh, |
961 | VIRTIO_CONFIG_QUEUE_ADDRESS, 0); |
962 | |
963 | kmem_free(vq->vq_entries, sizeof(*vq->vq_entries) * vq->vq_num); |
964 | bus_dmamap_unload(sc->sc_dmat, vq->vq_dmamap); |
965 | bus_dmamap_destroy(sc->sc_dmat, vq->vq_dmamap); |
966 | bus_dmamem_unmap(sc->sc_dmat, vq->vq_vaddr, vq->vq_bytesize); |
967 | bus_dmamem_free(sc->sc_dmat, &vq->vq_segs[0], 1); |
968 | mutex_destroy(&vq->vq_freelist_lock); |
969 | mutex_destroy(&vq->vq_uring_lock); |
970 | mutex_destroy(&vq->vq_aring_lock); |
971 | memset(vq, 0, sizeof(*vq)); |
972 | |
973 | return 0; |
974 | } |
975 | |
976 | /* |
977 | * Free descriptor management. |
978 | */ |
979 | static struct vq_entry * |
980 | vq_alloc_entry(struct virtqueue *vq) |
981 | { |
982 | struct vq_entry *qe; |
983 | |
984 | mutex_enter(&vq->vq_freelist_lock); |
985 | if (SIMPLEQ_EMPTY(&vq->vq_freelist)) { |
986 | mutex_exit(&vq->vq_freelist_lock); |
987 | return NULL; |
988 | } |
989 | qe = SIMPLEQ_FIRST(&vq->vq_freelist); |
990 | SIMPLEQ_REMOVE_HEAD(&vq->vq_freelist, qe_list); |
991 | mutex_exit(&vq->vq_freelist_lock); |
992 | |
993 | return qe; |
994 | } |
995 | |
996 | static void |
997 | vq_free_entry(struct virtqueue *vq, struct vq_entry *qe) |
998 | { |
999 | mutex_enter(&vq->vq_freelist_lock); |
1000 | SIMPLEQ_INSERT_TAIL(&vq->vq_freelist, qe, qe_list); |
1001 | mutex_exit(&vq->vq_freelist_lock); |
1002 | |
1003 | return; |
1004 | } |
1005 | |
1006 | /* |
1007 | * Enqueue several dmamaps as a single request. |
1008 | */ |
1009 | /* |
1010 | * Typical usage: |
1011 | * <queue size> number of followings are stored in arrays |
1012 | * - command blocks (in dmamem) should be pre-allocated and mapped |
1013 | * - dmamaps for command blocks should be pre-allocated and loaded |
1014 | * - dmamaps for payload should be pre-allocated |
1015 | * r = virtio_enqueue_prep(sc, vq, &slot); // allocate a slot |
1016 | * if (r) // currently 0 or EAGAIN |
1017 | * return r; |
1018 | * r = bus_dmamap_load(dmat, dmamap_payload[slot], data, count, ..); |
1019 | * if (r) { |
1020 | * virtio_enqueue_abort(sc, vq, slot); |
1021 | * bus_dmamap_unload(dmat, dmamap_payload[slot]); |
1022 | * return r; |
1023 | * } |
1024 | * r = virtio_enqueue_reserve(sc, vq, slot, |
1025 | * dmamap_payload[slot]->dm_nsegs+1); |
1026 | * // ^ +1 for command |
1027 | * if (r) { // currently 0 or EAGAIN |
1028 | * bus_dmamap_unload(dmat, dmamap_payload[slot]); |
1029 | * return r; // do not call abort() |
1030 | * } |
1031 | * <setup and prepare commands> |
1032 | * bus_dmamap_sync(dmat, dmamap_cmd[slot],... BUS_DMASYNC_PREWRITE); |
1033 | * bus_dmamap_sync(dmat, dmamap_payload[slot],...); |
1034 | * virtio_enqueue(sc, vq, slot, dmamap_cmd[slot], false); |
1035 | * virtio_enqueue(sc, vq, slot, dmamap_payload[slot], iswrite); |
1036 | * virtio_enqueue_commit(sc, vq, slot, true); |
1037 | */ |
1038 | |
1039 | /* |
1040 | * enqueue_prep: allocate a slot number |
1041 | */ |
1042 | int |
1043 | virtio_enqueue_prep(struct virtio_softc *sc, struct virtqueue *vq, int *slotp) |
1044 | { |
1045 | struct vq_entry *qe1; |
1046 | |
1047 | KASSERT(slotp != NULL); |
1048 | |
1049 | qe1 = vq_alloc_entry(vq); |
1050 | if (qe1 == NULL) |
1051 | return EAGAIN; |
1052 | /* next slot is not allocated yet */ |
1053 | qe1->qe_next = -1; |
1054 | *slotp = qe1->qe_index; |
1055 | |
1056 | return 0; |
1057 | } |
1058 | |
1059 | /* |
1060 | * enqueue_reserve: allocate remaining slots and build the descriptor chain. |
1061 | */ |
1062 | int |
1063 | virtio_enqueue_reserve(struct virtio_softc *sc, struct virtqueue *vq, |
1064 | int slot, int nsegs) |
1065 | { |
1066 | int indirect; |
1067 | struct vq_entry *qe1 = &vq->vq_entries[slot]; |
1068 | |
1069 | KASSERT(qe1->qe_next == -1); |
1070 | KASSERT(1 <= nsegs && nsegs <= vq->vq_num); |
1071 | |
1072 | if ((vq->vq_indirect != NULL) && |
1073 | (nsegs >= MINSEG_INDIRECT) && |
1074 | (nsegs <= vq->vq_maxnsegs)) |
1075 | indirect = 1; |
1076 | else |
1077 | indirect = 0; |
1078 | qe1->qe_indirect = indirect; |
1079 | |
1080 | if (indirect) { |
1081 | struct vring_desc *vd; |
1082 | int i; |
1083 | |
1084 | vd = &vq->vq_desc[qe1->qe_index]; |
1085 | vd->addr = vq->vq_dmamap->dm_segs[0].ds_addr |
1086 | + vq->vq_indirectoffset; |
1087 | vd->addr += sizeof(struct vring_desc) |
1088 | * vq->vq_maxnsegs * qe1->qe_index; |
1089 | vd->len = sizeof(struct vring_desc) * nsegs; |
1090 | vd->flags = VRING_DESC_F_INDIRECT; |
1091 | |
1092 | vd = vq->vq_indirect; |
1093 | vd += vq->vq_maxnsegs * qe1->qe_index; |
1094 | qe1->qe_desc_base = vd; |
1095 | |
1096 | for (i = 0; i < nsegs-1; i++) { |
1097 | vd[i].flags = VRING_DESC_F_NEXT; |
1098 | } |
1099 | vd[i].flags = 0; |
1100 | qe1->qe_next = 0; |
1101 | |
1102 | return 0; |
1103 | } else { |
1104 | struct vring_desc *vd; |
1105 | struct vq_entry *qe; |
1106 | int i, s; |
1107 | |
1108 | vd = &vq->vq_desc[0]; |
1109 | qe1->qe_desc_base = vd; |
1110 | qe1->qe_next = qe1->qe_index; |
1111 | s = slot; |
1112 | for (i = 0; i < nsegs - 1; i++) { |
1113 | qe = vq_alloc_entry(vq); |
1114 | if (qe == NULL) { |
1115 | vd[s].flags = 0; |
1116 | virtio_enqueue_abort(sc, vq, slot); |
1117 | return EAGAIN; |
1118 | } |
1119 | vd[s].flags = VRING_DESC_F_NEXT; |
1120 | vd[s].next = qe->qe_index; |
1121 | s = qe->qe_index; |
1122 | } |
1123 | vd[s].flags = 0; |
1124 | |
1125 | return 0; |
1126 | } |
1127 | } |
1128 | |
1129 | /* |
1130 | * enqueue: enqueue a single dmamap. |
1131 | */ |
1132 | int |
1133 | virtio_enqueue(struct virtio_softc *sc, struct virtqueue *vq, int slot, |
1134 | bus_dmamap_t dmamap, bool write) |
1135 | { |
1136 | struct vq_entry *qe1 = &vq->vq_entries[slot]; |
1137 | struct vring_desc *vd = qe1->qe_desc_base; |
1138 | int i; |
1139 | int s = qe1->qe_next; |
1140 | |
1141 | KASSERT(s >= 0); |
1142 | KASSERT(dmamap->dm_nsegs > 0); |
1143 | |
1144 | for (i = 0; i < dmamap->dm_nsegs; i++) { |
1145 | vd[s].addr = dmamap->dm_segs[i].ds_addr; |
1146 | vd[s].len = dmamap->dm_segs[i].ds_len; |
1147 | if (!write) |
1148 | vd[s].flags |= VRING_DESC_F_WRITE; |
1149 | s = vd[s].next; |
1150 | } |
1151 | qe1->qe_next = s; |
1152 | |
1153 | return 0; |
1154 | } |
1155 | |
1156 | int |
1157 | virtio_enqueue_p(struct virtio_softc *sc, struct virtqueue *vq, int slot, |
1158 | bus_dmamap_t dmamap, bus_addr_t start, bus_size_t len, |
1159 | bool write) |
1160 | { |
1161 | struct vq_entry *qe1 = &vq->vq_entries[slot]; |
1162 | struct vring_desc *vd = qe1->qe_desc_base; |
1163 | int s = qe1->qe_next; |
1164 | |
1165 | KASSERT(s >= 0); |
1166 | KASSERT(dmamap->dm_nsegs == 1); /* XXX */ |
1167 | KASSERT((dmamap->dm_segs[0].ds_len > start) && |
1168 | (dmamap->dm_segs[0].ds_len >= start + len)); |
1169 | |
1170 | vd[s].addr = dmamap->dm_segs[0].ds_addr + start; |
1171 | vd[s].len = len; |
1172 | if (!write) |
1173 | vd[s].flags |= VRING_DESC_F_WRITE; |
1174 | qe1->qe_next = vd[s].next; |
1175 | |
1176 | return 0; |
1177 | } |
1178 | |
1179 | /* |
1180 | * enqueue_commit: add it to the aring. |
1181 | */ |
1182 | int |
1183 | virtio_enqueue_commit(struct virtio_softc *sc, struct virtqueue *vq, int slot, |
1184 | bool notifynow) |
1185 | { |
1186 | struct vq_entry *qe1; |
1187 | |
1188 | if (slot < 0) { |
1189 | mutex_enter(&vq->vq_aring_lock); |
1190 | goto notify; |
1191 | } |
1192 | vq_sync_descs(sc, vq, BUS_DMASYNC_PREWRITE); |
1193 | qe1 = &vq->vq_entries[slot]; |
1194 | if (qe1->qe_indirect) |
1195 | vq_sync_indirect(sc, vq, slot, BUS_DMASYNC_PREWRITE); |
1196 | mutex_enter(&vq->vq_aring_lock); |
1197 | vq->vq_avail->ring[(vq->vq_avail_idx++) % vq->vq_num] = slot; |
1198 | |
1199 | notify: |
1200 | if (notifynow) { |
1201 | vq_sync_aring(sc, vq, BUS_DMASYNC_PREWRITE); |
1202 | vq_sync_uring(sc, vq, BUS_DMASYNC_PREREAD); |
1203 | membar_producer(); |
1204 | vq->vq_avail->idx = vq->vq_avail_idx; |
1205 | vq_sync_aring(sc, vq, BUS_DMASYNC_PREWRITE); |
1206 | membar_producer(); |
1207 | vq->vq_queued++; |
1208 | vq_sync_uring(sc, vq, BUS_DMASYNC_POSTREAD); |
1209 | membar_consumer(); |
1210 | if (!(vq->vq_used->flags & VRING_USED_F_NO_NOTIFY)) |
1211 | bus_space_write_2(sc->sc_iot, sc->sc_ioh, |
1212 | VIRTIO_CONFIG_QUEUE_NOTIFY, |
1213 | vq->vq_index); |
1214 | } |
1215 | mutex_exit(&vq->vq_aring_lock); |
1216 | |
1217 | return 0; |
1218 | } |
1219 | |
1220 | /* |
1221 | * enqueue_abort: rollback. |
1222 | */ |
1223 | int |
1224 | virtio_enqueue_abort(struct virtio_softc *sc, struct virtqueue *vq, int slot) |
1225 | { |
1226 | struct vq_entry *qe = &vq->vq_entries[slot]; |
1227 | struct vring_desc *vd; |
1228 | int s; |
1229 | |
1230 | if (qe->qe_next < 0) { |
1231 | vq_free_entry(vq, qe); |
1232 | return 0; |
1233 | } |
1234 | |
1235 | s = slot; |
1236 | vd = &vq->vq_desc[0]; |
1237 | while (vd[s].flags & VRING_DESC_F_NEXT) { |
1238 | s = vd[s].next; |
1239 | vq_free_entry(vq, qe); |
1240 | qe = &vq->vq_entries[s]; |
1241 | } |
1242 | vq_free_entry(vq, qe); |
1243 | return 0; |
1244 | } |
1245 | |
1246 | /* |
1247 | * Dequeue a request. |
1248 | */ |
1249 | /* |
1250 | * dequeue: dequeue a request from uring; dmamap_sync for uring is |
1251 | * already done in the interrupt handler. |
1252 | */ |
1253 | int |
1254 | virtio_dequeue(struct virtio_softc *sc, struct virtqueue *vq, |
1255 | int *slotp, int *lenp) |
1256 | { |
1257 | uint16_t slot, usedidx; |
1258 | struct vq_entry *qe; |
1259 | |
1260 | if (vq->vq_used_idx == vq->vq_used->idx) |
1261 | return ENOENT; |
1262 | mutex_enter(&vq->vq_uring_lock); |
1263 | usedidx = vq->vq_used_idx++; |
1264 | mutex_exit(&vq->vq_uring_lock); |
1265 | usedidx %= vq->vq_num; |
1266 | slot = vq->vq_used->ring[usedidx].id; |
1267 | qe = &vq->vq_entries[slot]; |
1268 | |
1269 | if (qe->qe_indirect) |
1270 | vq_sync_indirect(sc, vq, slot, BUS_DMASYNC_POSTWRITE); |
1271 | |
1272 | if (slotp) |
1273 | *slotp = slot; |
1274 | if (lenp) |
1275 | *lenp = vq->vq_used->ring[usedidx].len; |
1276 | |
1277 | return 0; |
1278 | } |
1279 | |
1280 | /* |
1281 | * dequeue_commit: complete dequeue; the slot is recycled for future use. |
1282 | * if you forget to call this the slot will be leaked. |
1283 | */ |
1284 | int |
1285 | virtio_dequeue_commit(struct virtio_softc *sc, struct virtqueue *vq, int slot) |
1286 | { |
1287 | struct vq_entry *qe = &vq->vq_entries[slot]; |
1288 | struct vring_desc *vd = &vq->vq_desc[0]; |
1289 | int s = slot; |
1290 | |
1291 | while (vd[s].flags & VRING_DESC_F_NEXT) { |
1292 | s = vd[s].next; |
1293 | vq_free_entry(vq, qe); |
1294 | qe = &vq->vq_entries[s]; |
1295 | } |
1296 | vq_free_entry(vq, qe); |
1297 | |
1298 | return 0; |
1299 | } |
1300 | |
1301 | MODULE(MODULE_CLASS_DRIVER, virtio, "pci" ); |
1302 | |
1303 | #ifdef _MODULE |
1304 | #include "ioconf.c" |
1305 | #endif |
1306 | |
1307 | static int |
1308 | virtio_modcmd(modcmd_t cmd, void *opaque) |
1309 | { |
1310 | int error = 0; |
1311 | |
1312 | #ifdef _MODULE |
1313 | switch (cmd) { |
1314 | case MODULE_CMD_INIT: |
1315 | error = config_init_component(cfdriver_ioconf_virtio, |
1316 | cfattach_ioconf_virtio, cfdata_ioconf_virtio); |
1317 | break; |
1318 | case MODULE_CMD_FINI: |
1319 | error = config_fini_component(cfdriver_ioconf_virtio, |
1320 | cfattach_ioconf_virtio, cfdata_ioconf_virtio); |
1321 | break; |
1322 | default: |
1323 | error = ENOTTY; |
1324 | break; |
1325 | } |
1326 | #endif |
1327 | |
1328 | return error; |
1329 | } |
1330 | |