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