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13#include <linux/export.h>
14#include <linux/init.h>
15#include <linux/pci.h>
16#include <linux/acpi.h>
17
18#include <linux/io.h>
19#include <asm/io_apic.h>
20#include <asm/pci_x86.h>
21
22#include <asm/xen/hypervisor.h>
23
24#include <xen/features.h>
25#include <xen/events.h>
26#include <asm/xen/pci.h>
27#include <asm/xen/cpuid.h>
28#include <asm/apic.h>
29#include <asm/acpi.h>
30#include <asm/i8259.h>
31
32static int xen_pcifront_enable_irq(struct pci_dev *dev)
33{
34 int rc;
35 int share = 1;
36 int pirq;
37 u8 gsi;
38
39 rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
40 if (rc < 0) {
41 dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
42 rc);
43 return rc;
44 }
45
46 pirq = gsi;
47
48 if (gsi < nr_legacy_irqs())
49 share = 0;
50
51 rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
52 if (rc < 0) {
53 dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
54 gsi, pirq, rc);
55 return rc;
56 }
57
58 dev->irq = rc;
59 dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
60 return 0;
61}
62
63#ifdef CONFIG_ACPI
64static int xen_register_pirq(u32 gsi, int triggering, bool set_pirq)
65{
66 int rc, pirq = -1, irq;
67 struct physdev_map_pirq map_irq;
68 int shareable = 0;
69 char *name;
70
71 irq = xen_irq_from_gsi(gsi);
72 if (irq > 0)
73 return irq;
74
75 if (set_pirq)
76 pirq = gsi;
77
78 map_irq.domid = DOMID_SELF;
79 map_irq.type = MAP_PIRQ_TYPE_GSI;
80 map_irq.index = gsi;
81 map_irq.pirq = pirq;
82
83 rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
84 if (rc) {
85 printk(KERN_WARNING "xen map irq failed %d\n", rc);
86 return -1;
87 }
88
89 if (triggering == ACPI_EDGE_SENSITIVE) {
90 shareable = 0;
91 name = "ioapic-edge";
92 } else {
93 shareable = 1;
94 name = "ioapic-level";
95 }
96
97 irq = xen_bind_pirq_gsi_to_irq(gsi, map_irq.pirq, shareable, name);
98 if (irq < 0)
99 goto out;
100
101 printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d (gsi=%d)\n", map_irq.pirq, irq, gsi);
102out:
103 return irq;
104}
105
106static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
107 int trigger, int polarity)
108{
109 if (!xen_hvm_domain())
110 return -1;
111
112 return xen_register_pirq(gsi, trigger,
113 false );
114}
115
116#ifdef CONFIG_XEN_DOM0
117static int xen_register_gsi(u32 gsi, int triggering, int polarity)
118{
119 int rc, irq;
120 struct physdev_setup_gsi setup_gsi;
121
122 if (!xen_pv_domain())
123 return -1;
124
125 printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
126 gsi, triggering, polarity);
127
128 irq = xen_register_pirq(gsi, triggering, true);
129
130 setup_gsi.gsi = gsi;
131 setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
132 setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
133
134 rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
135 if (rc == -EEXIST)
136 printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
137 else if (rc) {
138 printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
139 gsi, rc);
140 }
141
142 return irq;
143}
144
145static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
146 int trigger, int polarity)
147{
148 return xen_register_gsi(gsi, trigger, polarity);
149}
150#endif
151#endif
152
153#if defined(CONFIG_PCI_MSI)
154#include <linux/msi.h>
155#include <asm/msidef.h>
156
157struct xen_pci_frontend_ops *xen_pci_frontend;
158EXPORT_SYMBOL_GPL(xen_pci_frontend);
159
160struct xen_msi_ops {
161 int (*setup_msi_irqs)(struct pci_dev *dev, int nvec, int type);
162 void (*teardown_msi_irqs)(struct pci_dev *dev);
163};
164
165static struct xen_msi_ops xen_msi_ops __ro_after_init;
166
167static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
168{
169 int irq, ret, i;
170 struct msi_desc *msidesc;
171 int *v;
172
173 if (type == PCI_CAP_ID_MSI && nvec > 1)
174 return 1;
175
176 v = kcalloc(max(1, nvec), sizeof(int), GFP_KERNEL);
177 if (!v)
178 return -ENOMEM;
179
180 if (type == PCI_CAP_ID_MSIX)
181 ret = xen_pci_frontend_enable_msix(dev, v, nvec);
182 else
183 ret = xen_pci_frontend_enable_msi(dev, v);
184 if (ret)
185 goto error;
186 i = 0;
187 for_each_pci_msi_entry(msidesc, dev) {
188 irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i],
189 (type == PCI_CAP_ID_MSI) ? nvec : 1,
190 (type == PCI_CAP_ID_MSIX) ?
191 "pcifront-msi-x" :
192 "pcifront-msi",
193 DOMID_SELF);
194 if (irq < 0) {
195 ret = irq;
196 goto free;
197 }
198 i++;
199 }
200 kfree(v);
201 return 0;
202
203error:
204 if (ret == -ENOSYS)
205 dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
206 else if (ret)
207 dev_err(&dev->dev, "Xen PCI frontend error: %d!\n", ret);
208free:
209 kfree(v);
210 return ret;
211}
212
213#define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE | \
214 MSI_DATA_LEVEL_ASSERT | (3 << 8) | MSI_DATA_VECTOR(0))
215
216static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
217 struct msi_msg *msg)
218{
219
220
221
222 msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq);
223 msg->address_lo =
224 MSI_ADDR_BASE_LO |
225 MSI_ADDR_DEST_MODE_PHYSICAL |
226 MSI_ADDR_REDIRECTION_CPU |
227 MSI_ADDR_DEST_ID(pirq);
228
229 msg->data = XEN_PIRQ_MSI_DATA;
230}
231
232static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
233{
234 int irq, pirq;
235 struct msi_desc *msidesc;
236 struct msi_msg msg;
237
238 if (type == PCI_CAP_ID_MSI && nvec > 1)
239 return 1;
240
241 for_each_pci_msi_entry(msidesc, dev) {
242 pirq = xen_allocate_pirq_msi(dev, msidesc);
243 if (pirq < 0) {
244 irq = -ENODEV;
245 goto error;
246 }
247 xen_msi_compose_msg(dev, pirq, &msg);
248 __pci_write_msi_msg(msidesc, &msg);
249 dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
250 irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq,
251 (type == PCI_CAP_ID_MSI) ? nvec : 1,
252 (type == PCI_CAP_ID_MSIX) ?
253 "msi-x" : "msi",
254 DOMID_SELF);
255 if (irq < 0)
256 goto error;
257 dev_dbg(&dev->dev,
258 "xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);
259 }
260 return 0;
261
262error:
263 dev_err(&dev->dev, "Failed to create MSI%s! ret=%d!\n",
264 type == PCI_CAP_ID_MSI ? "" : "-X", irq);
265 return irq;
266}
267
268#ifdef CONFIG_XEN_DOM0
269static bool __read_mostly pci_seg_supported = true;
270
271static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
272{
273 int ret = 0;
274 struct msi_desc *msidesc;
275
276 for_each_pci_msi_entry(msidesc, dev) {
277 struct physdev_map_pirq map_irq;
278 domid_t domid;
279
280 domid = ret = xen_find_device_domain_owner(dev);
281
282
283 if (ret < 0)
284 domid = DOMID_SELF;
285
286 memset(&map_irq, 0, sizeof(map_irq));
287 map_irq.domid = domid;
288 map_irq.type = MAP_PIRQ_TYPE_MSI_SEG;
289 map_irq.index = -1;
290 map_irq.pirq = -1;
291 map_irq.bus = dev->bus->number |
292 (pci_domain_nr(dev->bus) << 16);
293 map_irq.devfn = dev->devfn;
294
295 if (type == PCI_CAP_ID_MSI && nvec > 1) {
296 map_irq.type = MAP_PIRQ_TYPE_MULTI_MSI;
297 map_irq.entry_nr = nvec;
298 } else if (type == PCI_CAP_ID_MSIX) {
299 int pos;
300 unsigned long flags;
301 u32 table_offset, bir;
302
303 pos = dev->msix_cap;
304 pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
305 &table_offset);
306 bir = (u8)(table_offset & PCI_MSIX_TABLE_BIR);
307 flags = pci_resource_flags(dev, bir);
308 if (!flags || (flags & IORESOURCE_UNSET))
309 return -EINVAL;
310
311 map_irq.table_base = pci_resource_start(dev, bir);
312 map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
313 }
314
315 ret = -EINVAL;
316 if (pci_seg_supported)
317 ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
318 &map_irq);
319 if (type == PCI_CAP_ID_MSI && nvec > 1 && ret) {
320
321
322
323
324
325
326 ret = 1;
327 goto out;
328 }
329 if (ret == -EINVAL && !pci_domain_nr(dev->bus)) {
330 map_irq.type = MAP_PIRQ_TYPE_MSI;
331 map_irq.index = -1;
332 map_irq.pirq = -1;
333 map_irq.bus = dev->bus->number;
334 ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
335 &map_irq);
336 if (ret != -EINVAL)
337 pci_seg_supported = false;
338 }
339 if (ret) {
340 dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n",
341 ret, domid);
342 goto out;
343 }
344
345 ret = xen_bind_pirq_msi_to_irq(dev, msidesc, map_irq.pirq,
346 (type == PCI_CAP_ID_MSI) ? nvec : 1,
347 (type == PCI_CAP_ID_MSIX) ? "msi-x" : "msi",
348 domid);
349 if (ret < 0)
350 goto out;
351 }
352 ret = 0;
353out:
354 return ret;
355}
356
357static void xen_initdom_restore_msi_irqs(struct pci_dev *dev)
358{
359 int ret = 0;
360
361 if (pci_seg_supported) {
362 struct physdev_pci_device restore_ext;
363
364 restore_ext.seg = pci_domain_nr(dev->bus);
365 restore_ext.bus = dev->bus->number;
366 restore_ext.devfn = dev->devfn;
367 ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi_ext,
368 &restore_ext);
369 if (ret == -ENOSYS)
370 pci_seg_supported = false;
371 WARN(ret && ret != -ENOSYS, "restore_msi_ext -> %d\n", ret);
372 }
373 if (!pci_seg_supported) {
374 struct physdev_restore_msi restore;
375
376 restore.bus = dev->bus->number;
377 restore.devfn = dev->devfn;
378 ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi, &restore);
379 WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);
380 }
381}
382#else
383#define xen_initdom_setup_msi_irqs NULL
384#define xen_initdom_restore_msi_irqs NULL
385#endif
386
387static void xen_teardown_msi_irqs(struct pci_dev *dev)
388{
389 struct msi_desc *msidesc;
390 int i;
391
392 for_each_pci_msi_entry(msidesc, dev) {
393 if (msidesc->irq) {
394 for (i = 0; i < msidesc->nvec_used; i++)
395 xen_destroy_irq(msidesc->irq + i);
396 }
397 }
398}
399
400static void xen_pv_teardown_msi_irqs(struct pci_dev *dev)
401{
402 struct msi_desc *msidesc = first_pci_msi_entry(dev);
403
404 if (msidesc->msi_attrib.is_msix)
405 xen_pci_frontend_disable_msix(dev);
406 else
407 xen_pci_frontend_disable_msi(dev);
408
409 xen_teardown_msi_irqs(dev);
410}
411
412static int xen_msi_domain_alloc_irqs(struct irq_domain *domain,
413 struct device *dev, int nvec)
414{
415 int type;
416
417 if (WARN_ON_ONCE(!dev_is_pci(dev)))
418 return -EINVAL;
419
420 if (first_msi_entry(dev)->msi_attrib.is_msix)
421 type = PCI_CAP_ID_MSIX;
422 else
423 type = PCI_CAP_ID_MSI;
424
425 return xen_msi_ops.setup_msi_irqs(to_pci_dev(dev), nvec, type);
426}
427
428static void xen_msi_domain_free_irqs(struct irq_domain *domain,
429 struct device *dev)
430{
431 if (WARN_ON_ONCE(!dev_is_pci(dev)))
432 return;
433
434 xen_msi_ops.teardown_msi_irqs(to_pci_dev(dev));
435}
436
437static struct msi_domain_ops xen_pci_msi_domain_ops = {
438 .domain_alloc_irqs = xen_msi_domain_alloc_irqs,
439 .domain_free_irqs = xen_msi_domain_free_irqs,
440};
441
442static struct msi_domain_info xen_pci_msi_domain_info = {
443 .ops = &xen_pci_msi_domain_ops,
444};
445
446
447
448
449
450
451
452
453
454static __init struct irq_domain *xen_create_pci_msi_domain(void)
455{
456 struct irq_domain *d = NULL;
457 struct fwnode_handle *fn;
458
459 fn = irq_domain_alloc_named_fwnode("XEN-MSI");
460 if (fn)
461 d = msi_create_irq_domain(fn, &xen_pci_msi_domain_info, NULL);
462
463
464 BUG_ON(!d);
465
466 return d;
467}
468
469static __init void xen_setup_pci_msi(void)
470{
471 if (xen_pv_domain()) {
472 if (xen_initial_domain()) {
473 xen_msi_ops.setup_msi_irqs = xen_initdom_setup_msi_irqs;
474 x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
475 } else {
476 xen_msi_ops.setup_msi_irqs = xen_setup_msi_irqs;
477 }
478 xen_msi_ops.teardown_msi_irqs = xen_pv_teardown_msi_irqs;
479 pci_msi_ignore_mask = 1;
480 } else if (xen_hvm_domain()) {
481 xen_msi_ops.setup_msi_irqs = xen_hvm_setup_msi_irqs;
482 xen_msi_ops.teardown_msi_irqs = xen_teardown_msi_irqs;
483 } else {
484 WARN_ON_ONCE(1);
485 return;
486 }
487
488
489
490
491
492 x86_init.irqs.create_pci_msi_domain = xen_create_pci_msi_domain;
493}
494
495#else
496static inline void xen_setup_pci_msi(void) { }
497#endif
498
499int __init pci_xen_init(void)
500{
501 if (!xen_pv_domain() || xen_initial_domain())
502 return -ENODEV;
503
504 printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
505
506 pcibios_set_cache_line_size();
507
508 pcibios_enable_irq = xen_pcifront_enable_irq;
509 pcibios_disable_irq = NULL;
510
511
512 acpi_noirq_set();
513
514 xen_setup_pci_msi();
515 return 0;
516}
517
518#ifdef CONFIG_PCI_MSI
519static void __init xen_hvm_msi_init(void)
520{
521 if (!disable_apic) {
522
523
524
525
526
527
528 uint32_t eax = cpuid_eax(xen_cpuid_base() + 4);
529
530 if (((eax & XEN_HVM_CPUID_X2APIC_VIRT) && x2apic_mode) ||
531 ((eax & XEN_HVM_CPUID_APIC_ACCESS_VIRT) && boot_cpu_has(X86_FEATURE_APIC)))
532 return;
533 }
534 xen_setup_pci_msi();
535}
536#endif
537
538int __init pci_xen_hvm_init(void)
539{
540 if (!xen_have_vector_callback || !xen_feature(XENFEAT_hvm_pirqs))
541 return 0;
542
543#ifdef CONFIG_ACPI
544
545
546
547
548 __acpi_register_gsi = acpi_register_gsi_xen_hvm;
549 __acpi_unregister_gsi = NULL;
550#endif
551
552#ifdef CONFIG_PCI_MSI
553
554
555
556
557 x86_platform.apic_post_init = xen_hvm_msi_init;
558#endif
559 return 0;
560}
561
562#ifdef CONFIG_XEN_DOM0
563int __init pci_xen_initial_domain(void)
564{
565 int irq;
566
567 xen_setup_pci_msi();
568 __acpi_register_gsi = acpi_register_gsi_xen;
569 __acpi_unregister_gsi = NULL;
570
571
572
573
574 for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
575 int trigger, polarity;
576
577 if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
578 continue;
579
580 xen_register_pirq(irq,
581 trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE,
582 true );
583 }
584 if (0 == nr_ioapics) {
585 for (irq = 0; irq < nr_legacy_irqs(); irq++)
586 xen_bind_pirq_gsi_to_irq(irq, irq, 0, "xt-pic");
587 }
588 return 0;
589}
590
591struct xen_device_domain_owner {
592 domid_t domain;
593 struct pci_dev *dev;
594 struct list_head list;
595};
596
597static DEFINE_SPINLOCK(dev_domain_list_spinlock);
598static struct list_head dev_domain_list = LIST_HEAD_INIT(dev_domain_list);
599
600static struct xen_device_domain_owner *find_device(struct pci_dev *dev)
601{
602 struct xen_device_domain_owner *owner;
603
604 list_for_each_entry(owner, &dev_domain_list, list) {
605 if (owner->dev == dev)
606 return owner;
607 }
608 return NULL;
609}
610
611int xen_find_device_domain_owner(struct pci_dev *dev)
612{
613 struct xen_device_domain_owner *owner;
614 int domain = -ENODEV;
615
616 spin_lock(&dev_domain_list_spinlock);
617 owner = find_device(dev);
618 if (owner)
619 domain = owner->domain;
620 spin_unlock(&dev_domain_list_spinlock);
621 return domain;
622}
623EXPORT_SYMBOL_GPL(xen_find_device_domain_owner);
624
625int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain)
626{
627 struct xen_device_domain_owner *owner;
628
629 owner = kzalloc(sizeof(struct xen_device_domain_owner), GFP_KERNEL);
630 if (!owner)
631 return -ENODEV;
632
633 spin_lock(&dev_domain_list_spinlock);
634 if (find_device(dev)) {
635 spin_unlock(&dev_domain_list_spinlock);
636 kfree(owner);
637 return -EEXIST;
638 }
639 owner->domain = domain;
640 owner->dev = dev;
641 list_add_tail(&owner->list, &dev_domain_list);
642 spin_unlock(&dev_domain_list_spinlock);
643 return 0;
644}
645EXPORT_SYMBOL_GPL(xen_register_device_domain_owner);
646
647int xen_unregister_device_domain_owner(struct pci_dev *dev)
648{
649 struct xen_device_domain_owner *owner;
650
651 spin_lock(&dev_domain_list_spinlock);
652 owner = find_device(dev);
653 if (!owner) {
654 spin_unlock(&dev_domain_list_spinlock);
655 return -ENODEV;
656 }
657 list_del(&owner->list);
658 spin_unlock(&dev_domain_list_spinlock);
659 kfree(owner);
660 return 0;
661}
662EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner);
663#endif
664
