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[mirror_qemu.git] / hw / ppc / spapr_vio.c
1 /*
2 * QEMU sPAPR VIO code
3 *
4 * Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com>
5 * Based on the s390 virtio bus code:
6 * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "qemu/osdep.h"
23 #include "qemu/error-report.h"
24 #include "qapi/error.h"
25 #include "hw/hw.h"
26 #include "qemu/log.h"
27 #include "sysemu/sysemu.h"
28 #include "hw/boards.h"
29 #include "hw/loader.h"
30 #include "elf.h"
31 #include "hw/sysbus.h"
32 #include "sysemu/kvm.h"
33 #include "sysemu/device_tree.h"
34 #include "kvm_ppc.h"
35
36 #include "hw/ppc/spapr.h"
37 #include "hw/ppc/spapr_vio.h"
38 #include "hw/ppc/xics.h"
39 #include "trace.h"
40
41 #include <libfdt.h>
42
43 static Property spapr_vio_props[] = {
44 DEFINE_PROP_UINT32("irq", VIOsPAPRDevice, irq, 0), \
45 DEFINE_PROP_END_OF_LIST(),
46 };
47
48 static char *spapr_vio_get_dev_name(DeviceState *qdev)
49 {
50 VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev);
51 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
52
53 /* Device tree style name device@reg */
54 return g_strdup_printf("%s@%x", pc->dt_name, dev->reg);
55 }
56
57 static void spapr_vio_bus_class_init(ObjectClass *klass, void *data)
58 {
59 BusClass *k = BUS_CLASS(klass);
60
61 k->get_dev_path = spapr_vio_get_dev_name;
62 k->get_fw_dev_path = spapr_vio_get_dev_name;
63 }
64
65 static const TypeInfo spapr_vio_bus_info = {
66 .name = TYPE_SPAPR_VIO_BUS,
67 .parent = TYPE_BUS,
68 .class_init = spapr_vio_bus_class_init,
69 .instance_size = sizeof(VIOsPAPRBus),
70 };
71
72 VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg)
73 {
74 BusChild *kid;
75 VIOsPAPRDevice *dev = NULL;
76
77 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
78 dev = (VIOsPAPRDevice *)kid->child;
79 if (dev->reg == reg) {
80 return dev;
81 }
82 }
83
84 return NULL;
85 }
86
87 static int vio_make_devnode(VIOsPAPRDevice *dev,
88 void *fdt)
89 {
90 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
91 int vdevice_off, node_off, ret;
92 char *dt_name;
93
94 vdevice_off = fdt_path_offset(fdt, "/vdevice");
95 if (vdevice_off < 0) {
96 return vdevice_off;
97 }
98
99 dt_name = spapr_vio_get_dev_name(DEVICE(dev));
100 node_off = fdt_add_subnode(fdt, vdevice_off, dt_name);
101 g_free(dt_name);
102 if (node_off < 0) {
103 return node_off;
104 }
105
106 ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg);
107 if (ret < 0) {
108 return ret;
109 }
110
111 if (pc->dt_type) {
112 ret = fdt_setprop_string(fdt, node_off, "device_type",
113 pc->dt_type);
114 if (ret < 0) {
115 return ret;
116 }
117 }
118
119 if (pc->dt_compatible) {
120 ret = fdt_setprop_string(fdt, node_off, "compatible",
121 pc->dt_compatible);
122 if (ret < 0) {
123 return ret;
124 }
125 }
126
127 if (dev->irq) {
128 uint32_t ints_prop[] = {cpu_to_be32(dev->irq), 0};
129
130 ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop,
131 sizeof(ints_prop));
132 if (ret < 0) {
133 return ret;
134 }
135 }
136
137 ret = spapr_tcet_dma_dt(fdt, node_off, "ibm,my-dma-window", dev->tcet);
138 if (ret < 0) {
139 return ret;
140 }
141
142 if (pc->devnode) {
143 ret = (pc->devnode)(dev, fdt, node_off);
144 if (ret < 0) {
145 return ret;
146 }
147 }
148
149 return node_off;
150 }
151
152 /*
153 * CRQ handling
154 */
155 static target_ulong h_reg_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr,
156 target_ulong opcode, target_ulong *args)
157 {
158 target_ulong reg = args[0];
159 target_ulong queue_addr = args[1];
160 target_ulong queue_len = args[2];
161 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
162
163 if (!dev) {
164 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
165 return H_PARAMETER;
166 }
167
168 /* We can't grok a queue size bigger than 256M for now */
169 if (queue_len < 0x1000 || queue_len > 0x10000000) {
170 hcall_dprintf("Queue size too small or too big (0x" TARGET_FMT_lx
171 ")\n", queue_len);
172 return H_PARAMETER;
173 }
174
175 /* Check queue alignment */
176 if (queue_addr & 0xfff) {
177 hcall_dprintf("Queue not aligned (0x" TARGET_FMT_lx ")\n", queue_addr);
178 return H_PARAMETER;
179 }
180
181 /* Check if device supports CRQs */
182 if (!dev->crq.SendFunc) {
183 hcall_dprintf("Device does not support CRQ\n");
184 return H_NOT_FOUND;
185 }
186
187 /* Already a queue ? */
188 if (dev->crq.qsize) {
189 hcall_dprintf("CRQ already registered\n");
190 return H_RESOURCE;
191 }
192 dev->crq.qladdr = queue_addr;
193 dev->crq.qsize = queue_len;
194 dev->crq.qnext = 0;
195
196 trace_spapr_vio_h_reg_crq(reg, queue_addr, queue_len);
197 return H_SUCCESS;
198 }
199
200 static target_ulong free_crq(VIOsPAPRDevice *dev)
201 {
202 dev->crq.qladdr = 0;
203 dev->crq.qsize = 0;
204 dev->crq.qnext = 0;
205
206 trace_spapr_vio_free_crq(dev->reg);
207
208 return H_SUCCESS;
209 }
210
211 static target_ulong h_free_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr,
212 target_ulong opcode, target_ulong *args)
213 {
214 target_ulong reg = args[0];
215 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
216
217 if (!dev) {
218 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
219 return H_PARAMETER;
220 }
221
222 return free_crq(dev);
223 }
224
225 static target_ulong h_send_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr,
226 target_ulong opcode, target_ulong *args)
227 {
228 target_ulong reg = args[0];
229 target_ulong msg_hi = args[1];
230 target_ulong msg_lo = args[2];
231 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
232 uint64_t crq_mangle[2];
233
234 if (!dev) {
235 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
236 return H_PARAMETER;
237 }
238 crq_mangle[0] = cpu_to_be64(msg_hi);
239 crq_mangle[1] = cpu_to_be64(msg_lo);
240
241 if (dev->crq.SendFunc) {
242 return dev->crq.SendFunc(dev, (uint8_t *)crq_mangle);
243 }
244
245 return H_HARDWARE;
246 }
247
248 static target_ulong h_enable_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr,
249 target_ulong opcode, target_ulong *args)
250 {
251 target_ulong reg = args[0];
252 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
253
254 if (!dev) {
255 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
256 return H_PARAMETER;
257 }
258
259 return 0;
260 }
261
262 /* Returns negative error, 0 success, or positive: queue full */
263 int spapr_vio_send_crq(VIOsPAPRDevice *dev, uint8_t *crq)
264 {
265 int rc;
266 uint8_t byte;
267
268 if (!dev->crq.qsize) {
269 error_report("spapr_vio_send_creq on uninitialized queue");
270 return -1;
271 }
272
273 /* Maybe do a fast path for KVM just writing to the pages */
274 rc = spapr_vio_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1);
275 if (rc) {
276 return rc;
277 }
278 if (byte != 0) {
279 return 1;
280 }
281
282 rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8,
283 &crq[8], 8);
284 if (rc) {
285 return rc;
286 }
287
288 kvmppc_eieio();
289
290 rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext, crq, 8);
291 if (rc) {
292 return rc;
293 }
294
295 dev->crq.qnext = (dev->crq.qnext + 16) % dev->crq.qsize;
296
297 if (dev->signal_state & 1) {
298 qemu_irq_pulse(spapr_vio_qirq(dev));
299 }
300
301 return 0;
302 }
303
304 /* "quiesce" handling */
305
306 static void spapr_vio_quiesce_one(VIOsPAPRDevice *dev)
307 {
308 if (dev->tcet) {
309 device_reset(DEVICE(dev->tcet));
310 }
311 free_crq(dev);
312 }
313
314 void spapr_vio_set_bypass(VIOsPAPRDevice *dev, bool bypass)
315 {
316 if (!dev->tcet) {
317 return;
318 }
319
320 memory_region_set_enabled(&dev->mrbypass, bypass);
321 memory_region_set_enabled(spapr_tce_get_iommu(dev->tcet), !bypass);
322
323 dev->tcet->bypass = bypass;
324 }
325
326 static void rtas_set_tce_bypass(PowerPCCPU *cpu, sPAPRMachineState *spapr,
327 uint32_t token,
328 uint32_t nargs, target_ulong args,
329 uint32_t nret, target_ulong rets)
330 {
331 VIOsPAPRBus *bus = spapr->vio_bus;
332 VIOsPAPRDevice *dev;
333 uint32_t unit, enable;
334
335 if (nargs != 2) {
336 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
337 return;
338 }
339 unit = rtas_ld(args, 0);
340 enable = rtas_ld(args, 1);
341 dev = spapr_vio_find_by_reg(bus, unit);
342 if (!dev) {
343 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
344 return;
345 }
346
347 if (!dev->tcet) {
348 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
349 return;
350 }
351
352 spapr_vio_set_bypass(dev, !!enable);
353
354 rtas_st(rets, 0, RTAS_OUT_SUCCESS);
355 }
356
357 static void rtas_quiesce(PowerPCCPU *cpu, sPAPRMachineState *spapr,
358 uint32_t token,
359 uint32_t nargs, target_ulong args,
360 uint32_t nret, target_ulong rets)
361 {
362 VIOsPAPRBus *bus = spapr->vio_bus;
363 BusChild *kid;
364 VIOsPAPRDevice *dev = NULL;
365
366 if (nargs != 0) {
367 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
368 return;
369 }
370
371 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
372 dev = (VIOsPAPRDevice *)kid->child;
373 spapr_vio_quiesce_one(dev);
374 }
375
376 rtas_st(rets, 0, RTAS_OUT_SUCCESS);
377 }
378
379 static VIOsPAPRDevice *reg_conflict(VIOsPAPRDevice *dev)
380 {
381 VIOsPAPRBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus);
382 BusChild *kid;
383 VIOsPAPRDevice *other;
384
385 /*
386 * Check for a device other than the given one which is already
387 * using the requested address. We have to open code this because
388 * the given dev might already be in the list.
389 */
390 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
391 other = VIO_SPAPR_DEVICE(kid->child);
392
393 if (other != dev && other->reg == dev->reg) {
394 return other;
395 }
396 }
397
398 return 0;
399 }
400
401 static void spapr_vio_busdev_reset(DeviceState *qdev)
402 {
403 VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev);
404 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
405
406 /* Shut down the request queue and TCEs if necessary */
407 spapr_vio_quiesce_one(dev);
408
409 dev->signal_state = 0;
410
411 spapr_vio_set_bypass(dev, false);
412 if (pc->reset) {
413 pc->reset(dev);
414 }
415 }
416
417 static void spapr_vio_busdev_realize(DeviceState *qdev, Error **errp)
418 {
419 sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
420 VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev;
421 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
422 char *id;
423 Error *local_err = NULL;
424
425 if (dev->reg != -1) {
426 /*
427 * Explicitly assigned address, just verify that no-one else
428 * is using it. other mechanism). We have to open code this
429 * rather than using spapr_vio_find_by_reg() because sdev
430 * itself is already in the list.
431 */
432 VIOsPAPRDevice *other = reg_conflict(dev);
433
434 if (other) {
435 error_setg(errp, "%s and %s devices conflict at address %#x",
436 object_get_typename(OBJECT(qdev)),
437 object_get_typename(OBJECT(&other->qdev)),
438 dev->reg);
439 return;
440 }
441 } else {
442 /* Need to assign an address */
443 VIOsPAPRBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus);
444
445 do {
446 dev->reg = bus->next_reg++;
447 } while (reg_conflict(dev));
448 }
449
450 /* Don't overwrite ids assigned on the command line */
451 if (!dev->qdev.id) {
452 id = spapr_vio_get_dev_name(DEVICE(dev));
453 dev->qdev.id = id;
454 }
455
456 dev->irq = xics_spapr_alloc(spapr->xics, 0, dev->irq, false, &local_err);
457 if (local_err) {
458 error_propagate(errp, local_err);
459 return;
460 }
461
462 if (pc->rtce_window_size) {
463 uint32_t liobn = SPAPR_VIO_LIOBN(dev->reg);
464
465 memory_region_init(&dev->mrroot, OBJECT(dev), "iommu-spapr-root",
466 ram_size);
467 memory_region_init_alias(&dev->mrbypass, OBJECT(dev),
468 "iommu-spapr-bypass", get_system_memory(),
469 0, ram_size);
470 memory_region_add_subregion_overlap(&dev->mrroot, 0, &dev->mrbypass, 1);
471 address_space_init(&dev->as, &dev->mrroot, qdev->id);
472
473 dev->tcet = spapr_tce_new_table(qdev, liobn);
474 spapr_tce_table_enable(dev->tcet, SPAPR_TCE_PAGE_SHIFT, 0,
475 pc->rtce_window_size >> SPAPR_TCE_PAGE_SHIFT);
476 dev->tcet->vdev = dev;
477 memory_region_add_subregion_overlap(&dev->mrroot, 0,
478 spapr_tce_get_iommu(dev->tcet), 2);
479 }
480
481 pc->realize(dev, errp);
482 }
483
484 static target_ulong h_vio_signal(PowerPCCPU *cpu, sPAPRMachineState *spapr,
485 target_ulong opcode,
486 target_ulong *args)
487 {
488 target_ulong reg = args[0];
489 target_ulong mode = args[1];
490 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
491 VIOsPAPRDeviceClass *pc;
492
493 if (!dev) {
494 return H_PARAMETER;
495 }
496
497 pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
498
499 if (mode & ~pc->signal_mask) {
500 return H_PARAMETER;
501 }
502
503 dev->signal_state = mode;
504
505 return H_SUCCESS;
506 }
507
508 VIOsPAPRBus *spapr_vio_bus_init(void)
509 {
510 VIOsPAPRBus *bus;
511 BusState *qbus;
512 DeviceState *dev;
513
514 /* Create bridge device */
515 dev = qdev_create(NULL, TYPE_SPAPR_VIO_BRIDGE);
516 qdev_init_nofail(dev);
517
518 /* Create bus on bridge device */
519 qbus = qbus_create(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio");
520 bus = SPAPR_VIO_BUS(qbus);
521 bus->next_reg = 0x71000000;
522
523 /* hcall-vio */
524 spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal);
525
526 /* hcall-crq */
527 spapr_register_hypercall(H_REG_CRQ, h_reg_crq);
528 spapr_register_hypercall(H_FREE_CRQ, h_free_crq);
529 spapr_register_hypercall(H_SEND_CRQ, h_send_crq);
530 spapr_register_hypercall(H_ENABLE_CRQ, h_enable_crq);
531
532 /* RTAS calls */
533 spapr_rtas_register(RTAS_IBM_SET_TCE_BYPASS, "ibm,set-tce-bypass",
534 rtas_set_tce_bypass);
535 spapr_rtas_register(RTAS_QUIESCE, "quiesce", rtas_quiesce);
536
537 return bus;
538 }
539
540 /* Represents sPAPR hcall VIO devices */
541
542 static int spapr_vio_bridge_init(SysBusDevice *dev)
543 {
544 /* nothing */
545 return 0;
546 }
547
548 static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data)
549 {
550 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
551 DeviceClass *dc = DEVICE_CLASS(klass);
552
553 dc->fw_name = "vdevice";
554 k->init = spapr_vio_bridge_init;
555 }
556
557 static const TypeInfo spapr_vio_bridge_info = {
558 .name = TYPE_SPAPR_VIO_BRIDGE,
559 .parent = TYPE_SYS_BUS_DEVICE,
560 .class_init = spapr_vio_bridge_class_init,
561 };
562
563 const VMStateDescription vmstate_spapr_vio = {
564 .name = "spapr_vio",
565 .version_id = 1,
566 .minimum_version_id = 1,
567 .fields = (VMStateField[]) {
568 /* Sanity check */
569 VMSTATE_UINT32_EQUAL(reg, VIOsPAPRDevice),
570 VMSTATE_UINT32_EQUAL(irq, VIOsPAPRDevice),
571
572 /* General VIO device state */
573 VMSTATE_UINT64(signal_state, VIOsPAPRDevice),
574 VMSTATE_UINT64(crq.qladdr, VIOsPAPRDevice),
575 VMSTATE_UINT32(crq.qsize, VIOsPAPRDevice),
576 VMSTATE_UINT32(crq.qnext, VIOsPAPRDevice),
577
578 VMSTATE_END_OF_LIST()
579 },
580 };
581
582 static void vio_spapr_device_class_init(ObjectClass *klass, void *data)
583 {
584 DeviceClass *k = DEVICE_CLASS(klass);
585 k->realize = spapr_vio_busdev_realize;
586 k->reset = spapr_vio_busdev_reset;
587 k->bus_type = TYPE_SPAPR_VIO_BUS;
588 k->props = spapr_vio_props;
589 }
590
591 static const TypeInfo spapr_vio_type_info = {
592 .name = TYPE_VIO_SPAPR_DEVICE,
593 .parent = TYPE_DEVICE,
594 .instance_size = sizeof(VIOsPAPRDevice),
595 .abstract = true,
596 .class_size = sizeof(VIOsPAPRDeviceClass),
597 .class_init = vio_spapr_device_class_init,
598 };
599
600 static void spapr_vio_register_types(void)
601 {
602 type_register_static(&spapr_vio_bus_info);
603 type_register_static(&spapr_vio_bridge_info);
604 type_register_static(&spapr_vio_type_info);
605 }
606
607 type_init(spapr_vio_register_types)
608
609 static int compare_reg(const void *p1, const void *p2)
610 {
611 VIOsPAPRDevice const *dev1, *dev2;
612
613 dev1 = (VIOsPAPRDevice *)*(DeviceState **)p1;
614 dev2 = (VIOsPAPRDevice *)*(DeviceState **)p2;
615
616 if (dev1->reg < dev2->reg) {
617 return -1;
618 }
619 if (dev1->reg == dev2->reg) {
620 return 0;
621 }
622
623 /* dev1->reg > dev2->reg */
624 return 1;
625 }
626
627 int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt)
628 {
629 DeviceState *qdev, **qdevs;
630 BusChild *kid;
631 int i, num, ret = 0;
632
633 /* Count qdevs on the bus list */
634 num = 0;
635 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
636 num++;
637 }
638
639 /* Copy out into an array of pointers */
640 qdevs = g_malloc(sizeof(qdev) * num);
641 num = 0;
642 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
643 qdevs[num++] = kid->child;
644 }
645
646 /* Sort the array */
647 qsort(qdevs, num, sizeof(qdev), compare_reg);
648
649 /* Hack alert. Give the devices to libfdt in reverse order, we happen
650 * to know that will mean they are in forward order in the tree. */
651 for (i = num - 1; i >= 0; i--) {
652 VIOsPAPRDevice *dev = (VIOsPAPRDevice *)(qdevs[i]);
653
654 ret = vio_make_devnode(dev, fdt);
655
656 if (ret < 0) {
657 goto out;
658 }
659 }
660
661 ret = 0;
662 out:
663 g_free(qdevs);
664
665 return ret;
666 }
667
668 int spapr_populate_chosen_stdout(void *fdt, VIOsPAPRBus *bus)
669 {
670 VIOsPAPRDevice *dev;
671 char *name, *path;
672 int ret, offset;
673
674 dev = spapr_vty_get_default(bus);
675 if (!dev)
676 return 0;
677
678 offset = fdt_path_offset(fdt, "/chosen");
679 if (offset < 0) {
680 return offset;
681 }
682
683 name = spapr_vio_get_dev_name(DEVICE(dev));
684 path = g_strdup_printf("/vdevice/%s", name);
685
686 ret = fdt_setprop_string(fdt, offset, "linux,stdout-path", path);
687
688 g_free(name);
689 g_free(path);
690
691 return ret;
692 }