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 "qapi/visitor.h"
26#include "hw/irq.h"
27#include "qemu/log.h"
28#include "hw/loader.h"
29#include "elf.h"
30#include "hw/sysbus.h"
31#include "sysemu/kvm.h"
32#include "sysemu/device_tree.h"
33#include "kvm_ppc.h"
34#include "migration/vmstate.h"
35#include "sysemu/qtest.h"
36
37#include "hw/ppc/spapr.h"
38#include "hw/ppc/spapr_vio.h"
39#include "hw/ppc/fdt.h"
40#include "trace.h"
41
42#include <libfdt.h>
43
44#define SPAPR_VIO_REG_BASE 0x71000000
45
46static char *spapr_vio_get_dev_name(DeviceState *qdev)
47{
48 SpaprVioDevice *dev = VIO_SPAPR_DEVICE(qdev);
49 SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
50
51 /* Device tree style name device@reg */
52 return g_strdup_printf("%s@%x", pc->dt_name, dev->reg);
53}
54
55static void spapr_vio_bus_class_init(ObjectClass *klass, void *data)
56{
57 BusClass *k = BUS_CLASS(klass);
58
59 k->get_dev_path = spapr_vio_get_dev_name;
60 k->get_fw_dev_path = spapr_vio_get_dev_name;
61}
62
63static const TypeInfo spapr_vio_bus_info = {
64 .name = TYPE_SPAPR_VIO_BUS,
65 .parent = TYPE_BUS,
66 .class_init = spapr_vio_bus_class_init,
67 .instance_size = sizeof(SpaprVioBus),
68};
69
70SpaprVioDevice *spapr_vio_find_by_reg(SpaprVioBus *bus, uint32_t reg)
71{
72 BusChild *kid;
73 SpaprVioDevice *dev = NULL;
74
75 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
76 dev = (SpaprVioDevice *)kid->child;
77 if (dev->reg == reg) {
78 return dev;
79 }
80 }
81
82 return NULL;
83}
84
85static int vio_make_devnode(SpaprVioDevice *dev,
86 void *fdt)
87{
88 SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
89 int vdevice_off, node_off, ret;
90 char *dt_name;
91
92 vdevice_off = fdt_path_offset(fdt, "/vdevice");
93 if (vdevice_off < 0) {
94 return vdevice_off;
95 }
96
97 dt_name = spapr_vio_get_dev_name(DEVICE(dev));
98 node_off = fdt_add_subnode(fdt, vdevice_off, dt_name);
99 g_free(dt_name);
100 if (node_off < 0) {
101 return node_off;
102 }
103
104 ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg);
105 if (ret < 0) {
106 return ret;
107 }
108
109 if (pc->dt_type) {
110 ret = fdt_setprop_string(fdt, node_off, "device_type",
111 pc->dt_type);
112 if (ret < 0) {
113 return ret;
114 }
115 }
116
117 if (pc->dt_compatible) {
118 ret = fdt_setprop_string(fdt, node_off, "compatible",
119 pc->dt_compatible);
120 if (ret < 0) {
121 return ret;
122 }
123 }
124
125 if (dev->irq) {
126 uint32_t ints_prop[2];
127
128 spapr_dt_irq(ints_prop, dev->irq, false);
129 ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop,
130 sizeof(ints_prop));
131 if (ret < 0) {
132 return ret;
133 }
134 }
135
136 ret = spapr_tcet_dma_dt(fdt, node_off, "ibm,my-dma-window", dev->tcet);
137 if (ret < 0) {
138 return ret;
139 }
140
141 if (pc->devnode) {
142 ret = (pc->devnode)(dev, fdt, node_off);
143 if (ret < 0) {
144 return ret;
145 }
146 }
147
148 return node_off;
149}
150
151/*
152 * CRQ handling
153 */
154static target_ulong h_reg_crq(PowerPCCPU *cpu, SpaprMachineState *spapr,
155 target_ulong opcode, target_ulong *args)
156{
157 target_ulong reg = args[0];
158 target_ulong queue_addr = args[1];
159 target_ulong queue_len = args[2];
160 SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
161
162 if (!dev) {
163 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
164 return H_PARAMETER;
165 }
166
167 /* We can't grok a queue size bigger than 256M for now */
168 if (queue_len < 0x1000 || queue_len > 0x10000000) {
169 hcall_dprintf("Queue size too small or too big (0x" TARGET_FMT_lx
170 ")\n", queue_len);
171 return H_PARAMETER;
172 }
173
174 /* Check queue alignment */
175 if (queue_addr & 0xfff) {
176 hcall_dprintf("Queue not aligned (0x" TARGET_FMT_lx ")\n", queue_addr);
177 return H_PARAMETER;
178 }
179
180 /* Check if device supports CRQs */
181 if (!dev->crq.SendFunc) {
182 hcall_dprintf("Device does not support CRQ\n");
183 return H_NOT_FOUND;
184 }
185
186 /* Already a queue ? */
187 if (dev->crq.qsize) {
188 hcall_dprintf("CRQ already registered\n");
189 return H_RESOURCE;
190 }
191 dev->crq.qladdr = queue_addr;
192 dev->crq.qsize = queue_len;
193 dev->crq.qnext = 0;
194
195 trace_spapr_vio_h_reg_crq(reg, queue_addr, queue_len);
196 return H_SUCCESS;
197}
198
199static target_ulong free_crq(SpaprVioDevice *dev)
200{
201 dev->crq.qladdr = 0;
202 dev->crq.qsize = 0;
203 dev->crq.qnext = 0;
204
205 trace_spapr_vio_free_crq(dev->reg);
206
207 return H_SUCCESS;
208}
209
210static target_ulong h_free_crq(PowerPCCPU *cpu, SpaprMachineState *spapr,
211 target_ulong opcode, target_ulong *args)
212{
213 target_ulong reg = args[0];
214 SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
215
216 if (!dev) {
217 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
218 return H_PARAMETER;
219 }
220
221 return free_crq(dev);
222}
223
224static target_ulong h_send_crq(PowerPCCPU *cpu, SpaprMachineState *spapr,
225 target_ulong opcode, target_ulong *args)
226{
227 target_ulong reg = args[0];
228 target_ulong msg_hi = args[1];
229 target_ulong msg_lo = args[2];
230 SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
231 uint64_t crq_mangle[2];
232
233 if (!dev) {
234 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
235 return H_PARAMETER;
236 }
237 crq_mangle[0] = cpu_to_be64(msg_hi);
238 crq_mangle[1] = cpu_to_be64(msg_lo);
239
240 if (dev->crq.SendFunc) {
241 return dev->crq.SendFunc(dev, (uint8_t *)crq_mangle);
242 }
243
244 return H_HARDWARE;
245}
246
247static target_ulong h_enable_crq(PowerPCCPU *cpu, SpaprMachineState *spapr,
248 target_ulong opcode, target_ulong *args)
249{
250 target_ulong reg = args[0];
251 SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
252
253 if (!dev) {
254 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
255 return H_PARAMETER;
256 }
257
258 return 0;
259}
260
261/* Returns negative error, 0 success, or positive: queue full */
262int spapr_vio_send_crq(SpaprVioDevice *dev, uint8_t *crq)
263{
264 int rc;
265 uint8_t byte;
266
267 if (!dev->crq.qsize) {
268 error_report("spapr_vio_send_creq on uninitialized queue");
269 return -1;
270 }
271
272 /* Maybe do a fast path for KVM just writing to the pages */
273 rc = spapr_vio_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1);
274 if (rc) {
275 return rc;
276 }
277 if (byte != 0) {
278 return 1;
279 }
280
281 rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8,
282 &crq[8], 8);
283 if (rc) {
284 return rc;
285 }
286
287 kvmppc_eieio();
288
289 rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext, crq, 8);
290 if (rc) {
291 return rc;
292 }
293
294 dev->crq.qnext = (dev->crq.qnext + 16) % dev->crq.qsize;
295
296 if (dev->signal_state & 1) {
297 qemu_irq_pulse(spapr_vio_qirq(dev));
298 }
299
300 return 0;
301}
302
303/* "quiesce" handling */
304
305static void spapr_vio_quiesce_one(SpaprVioDevice *dev)
306{
307 if (dev->tcet) {
308 device_reset(DEVICE(dev->tcet));
309 }
310 free_crq(dev);
311}
312
313void spapr_vio_set_bypass(SpaprVioDevice *dev, bool bypass)
314{
315 if (!dev->tcet) {
316 return;
317 }
318
319 memory_region_set_enabled(&dev->mrbypass, bypass);
320 memory_region_set_enabled(spapr_tce_get_iommu(dev->tcet), !bypass);
321
322 dev->tcet->bypass = bypass;
323}
324
325static void rtas_set_tce_bypass(PowerPCCPU *cpu, SpaprMachineState *spapr,
326 uint32_t token,
327 uint32_t nargs, target_ulong args,
328 uint32_t nret, target_ulong rets)
329{
330 SpaprVioBus *bus = spapr->vio_bus;
331 SpaprVioDevice *dev;
332 uint32_t unit, enable;
333
334 if (nargs != 2) {
335 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
336 return;
337 }
338 unit = rtas_ld(args, 0);
339 enable = rtas_ld(args, 1);
340 dev = spapr_vio_find_by_reg(bus, unit);
341 if (!dev) {
342 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
343 return;
344 }
345
346 if (!dev->tcet) {
347 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
348 return;
349 }
350
351 spapr_vio_set_bypass(dev, !!enable);
352
353 rtas_st(rets, 0, RTAS_OUT_SUCCESS);
354}
355
356static void rtas_quiesce(PowerPCCPU *cpu, SpaprMachineState *spapr,
357 uint32_t token,
358 uint32_t nargs, target_ulong args,
359 uint32_t nret, target_ulong rets)
360{
361 SpaprVioBus *bus = spapr->vio_bus;
362 BusChild *kid;
363 SpaprVioDevice *dev = NULL;
364
365 if (nargs != 0) {
366 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
367 return;
368 }
369
370 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
371 dev = (SpaprVioDevice *)kid->child;
372 spapr_vio_quiesce_one(dev);
373 }
374
375 rtas_st(rets, 0, RTAS_OUT_SUCCESS);
376}
377
378static SpaprVioDevice *reg_conflict(SpaprVioDevice *dev)
379{
380 SpaprVioBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus);
381 BusChild *kid;
382 SpaprVioDevice *other;
383
384 /*
385 * Check for a device other than the given one which is already
386 * using the requested address. We have to open code this because
387 * the given dev might already be in the list.
388 */
389 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
390 other = VIO_SPAPR_DEVICE(kid->child);
391
392 if (other != dev && other->reg == dev->reg) {
393 return other;
394 }
395 }
396
397 return 0;
398}
399
400static void spapr_vio_busdev_reset(DeviceState *qdev)
401{
402 SpaprVioDevice *dev = VIO_SPAPR_DEVICE(qdev);
403 SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
404
405 /* Shut down the request queue and TCEs if necessary */
406 spapr_vio_quiesce_one(dev);
407
408 dev->signal_state = 0;
409
410 spapr_vio_set_bypass(dev, false);
411 if (pc->reset) {
412 pc->reset(dev);
413 }
414}
415
416/*
417 * The register property of a VIO device is defined in livirt using
418 * 0x1000 as a base register number plus a 0x1000 increment. For the
419 * VIO tty device, the base number is changed to 0x30000000. QEMU uses
420 * a base register number of 0x71000000 and then a simple increment.
421 *
422 * The formula below tries to compute a unique index number from the
423 * register value that will be used to define the IRQ number of the
424 * VIO device.
425 *
426 * A maximum of 256 VIO devices is covered. Collisions are possible
427 * but they will be detected when the IRQ is claimed.
428 */
429static inline uint32_t spapr_vio_reg_to_irq(uint32_t reg)
430{
431 uint32_t irq;
432
433 if (reg >= SPAPR_VIO_REG_BASE) {
434 /*
435 * VIO device register values when allocated by QEMU. For
436 * these, we simply mask the high bits to fit the overall
437 * range: [0x00 - 0xff].
438 *
439 * The nvram VIO device (reg=0x71000000) is a static device of
440 * the pseries machine and so is always allocated by QEMU. Its
441 * IRQ number is 0x0.
442 */
443 irq = reg & 0xff;
444
445 } else if (reg >= 0x30000000) {
446 /*
447 * VIO tty devices register values, when allocated by livirt,
448 * are mapped in range [0xf0 - 0xff], gives us a maximum of 16
449 * vtys.
450 */
451 irq = 0xf0 | ((reg >> 12) & 0xf);
452
453 } else {
454 /*
455 * Other VIO devices register values, when allocated by
456 * livirt, should be mapped in range [0x00 - 0xef]. Conflicts
457 * will be detected when IRQ is claimed.
458 */
459 irq = (reg >> 12) & 0xff;
460 }
461
462 return SPAPR_IRQ_VIO | irq;
463}
464
465static void spapr_vio_busdev_realize(DeviceState *qdev, Error **errp)
466{
467 SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
468 SpaprVioDevice *dev = (SpaprVioDevice *)qdev;
469 SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
470 char *id;
471 Error *local_err = NULL;
472
473 if (dev->reg != -1) {
474 /*
475 * Explicitly assigned address, just verify that no-one else
476 * is using it. other mechanism). We have to open code this
477 * rather than using spapr_vio_find_by_reg() because sdev
478 * itself is already in the list.
479 */
480 SpaprVioDevice *other = reg_conflict(dev);
481
482 if (other) {
483 error_setg(errp, "%s and %s devices conflict at address %#x",
484 object_get_typename(OBJECT(qdev)),
485 object_get_typename(OBJECT(&other->qdev)),
486 dev->reg);
487 return;
488 }
489 } else {
490 /* Need to assign an address */
491 SpaprVioBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus);
492
493 do {
494 dev->reg = bus->next_reg++;
495 } while (reg_conflict(dev));
496 }
497
498 /* Don't overwrite ids assigned on the command line */
499 if (!dev->qdev.id) {
500 id = spapr_vio_get_dev_name(DEVICE(dev));
501 dev->qdev.id = id;
502 }
503
504 dev->irq = spapr_vio_reg_to_irq(dev->reg);
505
506 if (SPAPR_MACHINE_GET_CLASS(spapr)->legacy_irq_allocation) {
507 dev->irq = spapr_irq_findone(spapr, &local_err);
508 if (local_err) {
509 error_propagate(errp, local_err);
510 return;
511 }
512 }
513
514 spapr_irq_claim(spapr, dev->irq, false, &local_err);
515 if (local_err) {
516 error_propagate(errp, local_err);
517 return;
518 }
519
520 if (pc->rtce_window_size) {
521 uint32_t liobn = SPAPR_VIO_LIOBN(dev->reg);
522
523 memory_region_init(&dev->mrroot, OBJECT(dev), "iommu-spapr-root",
524 ram_size);
525 memory_region_init_alias(&dev->mrbypass, OBJECT(dev),
526 "iommu-spapr-bypass", get_system_memory(),
527 0, ram_size);
528 memory_region_add_subregion_overlap(&dev->mrroot, 0, &dev->mrbypass, 1);
529 address_space_init(&dev->as, &dev->mrroot, qdev->id);
530
531 dev->tcet = spapr_tce_new_table(qdev, liobn);
532 spapr_tce_table_enable(dev->tcet, SPAPR_TCE_PAGE_SHIFT, 0,
533 pc->rtce_window_size >> SPAPR_TCE_PAGE_SHIFT);
534 dev->tcet->vdev = dev;
535 memory_region_add_subregion_overlap(&dev->mrroot, 0,
536 spapr_tce_get_iommu(dev->tcet), 2);
537 }
538
539 pc->realize(dev, errp);
540}
541
542static target_ulong h_vio_signal(PowerPCCPU *cpu, SpaprMachineState *spapr,
543 target_ulong opcode,
544 target_ulong *args)
545{
546 target_ulong reg = args[0];
547 target_ulong mode = args[1];
548 SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
549 SpaprVioDeviceClass *pc;
550
551 if (!dev) {
552 return H_PARAMETER;
553 }
554
555 pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
556
557 if (mode & ~pc->signal_mask) {
558 return H_PARAMETER;
559 }
560
561 dev->signal_state = mode;
562
563 return H_SUCCESS;
564}
565
566SpaprVioBus *spapr_vio_bus_init(void)
567{
568 SpaprVioBus *bus;
569 BusState *qbus;
570 DeviceState *dev;
571
572 /* Create bridge device */
573 dev = qdev_create(NULL, TYPE_SPAPR_VIO_BRIDGE);
574 qdev_init_nofail(dev);
575
576 /* Create bus on bridge device */
577 qbus = qbus_create(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio");
578 bus = SPAPR_VIO_BUS(qbus);
579 bus->next_reg = SPAPR_VIO_REG_BASE;
580
581 /* hcall-vio */
582 spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal);
583
584 /* hcall-crq */
585 spapr_register_hypercall(H_REG_CRQ, h_reg_crq);
586 spapr_register_hypercall(H_FREE_CRQ, h_free_crq);
587 spapr_register_hypercall(H_SEND_CRQ, h_send_crq);
588 spapr_register_hypercall(H_ENABLE_CRQ, h_enable_crq);
589
590 /* RTAS calls */
591 spapr_rtas_register(RTAS_IBM_SET_TCE_BYPASS, "ibm,set-tce-bypass",
592 rtas_set_tce_bypass);
593 spapr_rtas_register(RTAS_QUIESCE, "quiesce", rtas_quiesce);
594
595 return bus;
596}
597
598static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data)
599{
600 DeviceClass *dc = DEVICE_CLASS(klass);
601
602 dc->fw_name = "vdevice";
603}
604
605static const TypeInfo spapr_vio_bridge_info = {
606 .name = TYPE_SPAPR_VIO_BRIDGE,
607 .parent = TYPE_SYS_BUS_DEVICE,
608 .class_init = spapr_vio_bridge_class_init,
609};
610
611const VMStateDescription vmstate_spapr_vio = {
612 .name = "spapr_vio",
613 .version_id = 1,
614 .minimum_version_id = 1,
615 .fields = (VMStateField[]) {
616 /* Sanity check */
617 VMSTATE_UINT32_EQUAL(reg, SpaprVioDevice, NULL),
618 VMSTATE_UINT32_EQUAL(irq, SpaprVioDevice, NULL),
619
620 /* General VIO device state */
621 VMSTATE_UINT64(signal_state, SpaprVioDevice),
622 VMSTATE_UINT64(crq.qladdr, SpaprVioDevice),
623 VMSTATE_UINT32(crq.qsize, SpaprVioDevice),
624 VMSTATE_UINT32(crq.qnext, SpaprVioDevice),
625
626 VMSTATE_END_OF_LIST()
627 },
628};
629
630static void vio_spapr_device_class_init(ObjectClass *klass, void *data)
631{
632 DeviceClass *k = DEVICE_CLASS(klass);
633 k->realize = spapr_vio_busdev_realize;
634 k->reset = spapr_vio_busdev_reset;
635 k->bus_type = TYPE_SPAPR_VIO_BUS;
636}
637
638static const TypeInfo spapr_vio_type_info = {
639 .name = TYPE_VIO_SPAPR_DEVICE,
640 .parent = TYPE_DEVICE,
641 .instance_size = sizeof(SpaprVioDevice),
642 .abstract = true,
643 .class_size = sizeof(SpaprVioDeviceClass),
644 .class_init = vio_spapr_device_class_init,
645};
646
647static void spapr_vio_register_types(void)
648{
649 type_register_static(&spapr_vio_bus_info);
650 type_register_static(&spapr_vio_bridge_info);
651 type_register_static(&spapr_vio_type_info);
652}
653
654type_init(spapr_vio_register_types)
655
656static int compare_reg(const void *p1, const void *p2)
657{
658 SpaprVioDevice const *dev1, *dev2;
659
660 dev1 = (SpaprVioDevice *)*(DeviceState **)p1;
661 dev2 = (SpaprVioDevice *)*(DeviceState **)p2;
662
663 if (dev1->reg < dev2->reg) {
664 return -1;
665 }
666 if (dev1->reg == dev2->reg) {
667 return 0;
668 }
669
670 /* dev1->reg > dev2->reg */
671 return 1;
672}
673
674void spapr_dt_vdevice(SpaprVioBus *bus, void *fdt)
675{
676 DeviceState *qdev, **qdevs;
677 BusChild *kid;
678 int i, num, ret = 0;
679 int node;
680
681 _FDT(node = fdt_add_subnode(fdt, 0, "vdevice"));
682
683 _FDT(fdt_setprop_string(fdt, node, "device_type", "vdevice"));
684 _FDT(fdt_setprop_string(fdt, node, "compatible", "IBM,vdevice"));
685 _FDT(fdt_setprop_cell(fdt, node, "#address-cells", 1));
686 _FDT(fdt_setprop_cell(fdt, node, "#size-cells", 0));
687 _FDT(fdt_setprop_cell(fdt, node, "#interrupt-cells", 2));
688 _FDT(fdt_setprop(fdt, node, "interrupt-controller", NULL, 0));
689
690 /* Count qdevs on the bus list */
691 num = 0;
692 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
693 num++;
694 }
695
696 /* Copy out into an array of pointers */
697 qdevs = g_new(DeviceState *, num);
698 num = 0;
699 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
700 qdevs[num++] = kid->child;
701 }
702
703 /* Sort the array */
704 qsort(qdevs, num, sizeof(qdev), compare_reg);
705
706 /* Hack alert. Give the devices to libfdt in reverse order, we happen
707 * to know that will mean they are in forward order in the tree. */
708 for (i = num - 1; i >= 0; i--) {
709 SpaprVioDevice *dev = (SpaprVioDevice *)(qdevs[i]);
710 SpaprVioDeviceClass *vdc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
711
712 ret = vio_make_devnode(dev, fdt);
713 if (ret < 0) {
714 error_report("Couldn't create device node /vdevice/%s@%"PRIx32,
715 vdc->dt_name, dev->reg);
716 exit(1);
717 }
718 }
719
720 g_free(qdevs);
721}
722
723gchar *spapr_vio_stdout_path(SpaprVioBus *bus)
724{
725 SpaprVioDevice *dev;
726 char *name, *path;
727
728 dev = spapr_vty_get_default(bus);
729 if (!dev) {
730 return NULL;
731 }
732
733 name = spapr_vio_get_dev_name(DEVICE(dev));
734 path = g_strdup_printf("/vdevice/%s", name);
735
736 g_free(name);
737 return path;
738}
739