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12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/pci.h>
15#include <linux/acpi.h>
16
17#include <linux/io.h>
18#include <asm/io_apic.h>
19#include <asm/pci_x86.h>
20
21#include <asm/xen/hypervisor.h>
22
23#include <xen/features.h>
24#include <xen/events.h>
25#include <asm/xen/pci.h>
26#include <asm/xen/cpuid.h>
27#include <asm/apic.h>
28#include <asm/i8259.h>
29
30static int xen_pcifront_enable_irq(struct pci_dev *dev)
31{
32 int rc;
33 int share = 1;
34 int pirq;
35 u8 gsi;
36
37 rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
38 if (rc < 0) {
39 dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
40 rc);
41 return rc;
42 }
43
44 pirq = gsi;
45
46 if (gsi < nr_legacy_irqs())
47 share = 0;
48
49 rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
50 if (rc < 0) {
51 dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
52 gsi, pirq, rc);
53 return rc;
54 }
55
56 dev->irq = rc;
57 dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
58 return 0;
59}
60
61#ifdef CONFIG_ACPI
62static int xen_register_pirq(u32 gsi, int gsi_override, int triggering,
63 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 if (gsi_override >= 0)
97 gsi = gsi_override;
98
99 irq = xen_bind_pirq_gsi_to_irq(gsi, map_irq.pirq, shareable, name);
100 if (irq < 0)
101 goto out;
102
103 printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d (gsi=%d)\n", map_irq.pirq, irq, gsi);
104out:
105 return irq;
106}
107
108static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
109 int trigger, int polarity)
110{
111 if (!xen_hvm_domain())
112 return -1;
113
114 return xen_register_pirq(gsi, -1 , trigger,
115 false );
116}
117
118#ifdef CONFIG_XEN_DOM0
119static int xen_register_gsi(u32 gsi, int gsi_override, int triggering, int polarity)
120{
121 int rc, irq;
122 struct physdev_setup_gsi setup_gsi;
123
124 if (!xen_pv_domain())
125 return -1;
126
127 printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
128 gsi, triggering, polarity);
129
130 irq = xen_register_pirq(gsi, gsi_override, triggering, true);
131
132 setup_gsi.gsi = gsi;
133 setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
134 setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
135
136 rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
137 if (rc == -EEXIST)
138 printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
139 else if (rc) {
140 printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
141 gsi, rc);
142 }
143
144 return irq;
145}
146
147static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
148 int trigger, int polarity)
149{
150 return xen_register_gsi(gsi, -1 , trigger, polarity);
151}
152#endif
153#endif
154
155#if defined(CONFIG_PCI_MSI)
156#include <linux/msi.h>
157#include <asm/msidef.h>
158
159struct xen_pci_frontend_ops *xen_pci_frontend;
160EXPORT_SYMBOL_GPL(xen_pci_frontend);
161
162static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
163{
164 int irq, ret, i;
165 struct msi_desc *msidesc;
166 int *v;
167
168 if (type == PCI_CAP_ID_MSI && nvec > 1)
169 return 1;
170
171 v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
172 if (!v)
173 return -ENOMEM;
174
175 if (type == PCI_CAP_ID_MSIX)
176 ret = xen_pci_frontend_enable_msix(dev, v, nvec);
177 else
178 ret = xen_pci_frontend_enable_msi(dev, v);
179 if (ret)
180 goto error;
181 i = 0;
182 list_for_each_entry(msidesc, &dev->msi_list, list) {
183 irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i],
184 (type == PCI_CAP_ID_MSI) ? nvec : 1,
185 (type == PCI_CAP_ID_MSIX) ?
186 "pcifront-msi-x" :
187 "pcifront-msi",
188 DOMID_SELF);
189 if (irq < 0) {
190 ret = irq;
191 goto free;
192 }
193 i++;
194 }
195 kfree(v);
196 return 0;
197
198error:
199 dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
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 list_for_each_entry(msidesc, &dev->msi_list, list) {
234 __pci_read_msi_msg(msidesc, &msg);
235 pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) |
236 ((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
237 if (msg.data != XEN_PIRQ_MSI_DATA ||
238 xen_irq_from_pirq(pirq) < 0) {
239 pirq = xen_allocate_pirq_msi(dev, msidesc);
240 if (pirq < 0) {
241 irq = -ENODEV;
242 goto error;
243 }
244 xen_msi_compose_msg(dev, pirq, &msg);
245 __pci_write_msi_msg(msidesc, &msg);
246 dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
247 } else {
248 dev_dbg(&dev->dev,
249 "xen: msi already bound to pirq=%d\n", pirq);
250 }
251 irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq,
252 (type == PCI_CAP_ID_MSI) ? nvec : 1,
253 (type == PCI_CAP_ID_MSIX) ?
254 "msi-x" : "msi",
255 DOMID_SELF);
256 if (irq < 0)
257 goto error;
258 dev_dbg(&dev->dev,
259 "xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);
260 }
261 return 0;
262
263error:
264 dev_err(&dev->dev,
265 "Xen PCI frontend has not registered MSI/MSI-X support!\n");
266 return irq;
267}
268
269#ifdef CONFIG_XEN_DOM0
270static bool __read_mostly pci_seg_supported = true;
271
272static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
273{
274 int ret = 0;
275 struct msi_desc *msidesc;
276
277 list_for_each_entry(msidesc, &dev->msi_list, list) {
278 struct physdev_map_pirq map_irq;
279 domid_t domid;
280
281 domid = ret = xen_find_device_domain_owner(dev);
282
283
284 if (ret < 0)
285 domid = DOMID_SELF;
286
287 memset(&map_irq, 0, sizeof(map_irq));
288 map_irq.domid = domid;
289 map_irq.type = MAP_PIRQ_TYPE_MSI_SEG;
290 map_irq.index = -1;
291 map_irq.pirq = -1;
292 map_irq.bus = dev->bus->number |
293 (pci_domain_nr(dev->bus) << 16);
294 map_irq.devfn = dev->devfn;
295
296 if (type == PCI_CAP_ID_MSI && nvec > 1) {
297 map_irq.type = MAP_PIRQ_TYPE_MULTI_MSI;
298 map_irq.entry_nr = nvec;
299 } else if (type == PCI_CAP_ID_MSIX) {
300 int pos;
301 unsigned long flags;
302 u32 table_offset, bir;
303
304 pos = dev->msix_cap;
305 pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
306 &table_offset);
307 bir = (u8)(table_offset & PCI_MSIX_TABLE_BIR);
308 flags = pci_resource_flags(dev, bir);
309 if (!flags || (flags & IORESOURCE_UNSET))
310 return -EINVAL;
311
312 map_irq.table_base = pci_resource_start(dev, bir);
313 map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
314 }
315
316 ret = -EINVAL;
317 if (pci_seg_supported)
318 ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
319 &map_irq);
320 if (type == PCI_CAP_ID_MSI && nvec > 1 && ret) {
321
322
323
324
325
326
327 ret = 1;
328 goto out;
329 }
330 if (ret == -EINVAL && !pci_domain_nr(dev->bus)) {
331 map_irq.type = MAP_PIRQ_TYPE_MSI;
332 map_irq.index = -1;
333 map_irq.pirq = -1;
334 map_irq.bus = dev->bus->number;
335 ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
336 &map_irq);
337 if (ret != -EINVAL)
338 pci_seg_supported = false;
339 }
340 if (ret) {
341 dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n",
342 ret, domid);
343 goto out;
344 }
345
346 ret = xen_bind_pirq_msi_to_irq(dev, msidesc, map_irq.pirq,
347 (type == PCI_CAP_ID_MSI) ? nvec : 1,
348 (type == PCI_CAP_ID_MSIX) ? "msi-x" : "msi",
349 domid);
350 if (ret < 0)
351 goto out;
352 }
353 ret = 0;
354out:
355 return ret;
356}
357
358static void xen_initdom_restore_msi_irqs(struct pci_dev *dev)
359{
360 int ret = 0;
361
362 if (pci_seg_supported) {
363 struct physdev_pci_device restore_ext;
364
365 restore_ext.seg = pci_domain_nr(dev->bus);
366 restore_ext.bus = dev->bus->number;
367 restore_ext.devfn = dev->devfn;
368 ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi_ext,
369 &restore_ext);
370 if (ret == -ENOSYS)
371 pci_seg_supported = false;
372 WARN(ret && ret != -ENOSYS, "restore_msi_ext -> %d\n", ret);
373 }
374 if (!pci_seg_supported) {
375 struct physdev_restore_msi restore;
376
377 restore.bus = dev->bus->number;
378 restore.devfn = dev->devfn;
379 ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi, &restore);
380 WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);
381 }
382}
383#endif
384
385static void xen_teardown_msi_irqs(struct pci_dev *dev)
386{
387 struct msi_desc *msidesc;
388
389 msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
390 if (msidesc->msi_attrib.is_msix)
391 xen_pci_frontend_disable_msix(dev);
392 else
393 xen_pci_frontend_disable_msi(dev);
394
395
396 default_teardown_msi_irqs(dev);
397}
398
399static void xen_teardown_msi_irq(unsigned int irq)
400{
401 xen_destroy_irq(irq);
402}
403
404#endif
405
406int __init pci_xen_init(void)
407{
408 if (!xen_pv_domain() || xen_initial_domain())
409 return -ENODEV;
410
411 printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
412
413 pcibios_set_cache_line_size();
414
415 pcibios_enable_irq = xen_pcifront_enable_irq;
416 pcibios_disable_irq = NULL;
417
418#ifdef CONFIG_ACPI
419
420 acpi_noirq = 1;
421#endif
422
423#ifdef CONFIG_PCI_MSI
424 x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
425 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
426 x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
427 pci_msi_ignore_mask = 1;
428#endif
429 return 0;
430}
431
432#ifdef CONFIG_PCI_MSI
433void __init xen_msi_init(void)
434{
435 if (!disable_apic) {
436
437
438
439
440
441
442 uint32_t eax = cpuid_eax(xen_cpuid_base() + 4);
443
444 if (((eax & XEN_HVM_CPUID_X2APIC_VIRT) && x2apic_mode) ||
445 ((eax & XEN_HVM_CPUID_APIC_ACCESS_VIRT) && cpu_has_apic))
446 return;
447 }
448
449 x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
450 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
451}
452#endif
453
454int __init pci_xen_hvm_init(void)
455{
456 if (!xen_have_vector_callback || !xen_feature(XENFEAT_hvm_pirqs))
457 return 0;
458
459#ifdef CONFIG_ACPI
460
461
462
463
464 __acpi_register_gsi = acpi_register_gsi_xen_hvm;
465 __acpi_unregister_gsi = NULL;
466#endif
467
468#ifdef CONFIG_PCI_MSI
469
470
471
472
473 x86_platform.apic_post_init = xen_msi_init;
474#endif
475 return 0;
476}
477
478#ifdef CONFIG_XEN_DOM0
479int __init pci_xen_initial_domain(void)
480{
481 int irq;
482
483#ifdef CONFIG_PCI_MSI
484 x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
485 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
486 x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
487 pci_msi_ignore_mask = 1;
488#endif
489 __acpi_register_gsi = acpi_register_gsi_xen;
490 __acpi_unregister_gsi = NULL;
491
492 for (irq = 0; irq < nr_legacy_irqs(); irq++) {
493 int trigger, polarity;
494
495 if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
496 continue;
497
498 xen_register_pirq(irq, -1 ,
499 trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE,
500 true );
501 }
502 if (0 == nr_ioapics) {
503 for (irq = 0; irq < nr_legacy_irqs(); irq++)
504 xen_bind_pirq_gsi_to_irq(irq, irq, 0, "xt-pic");
505 }
506 return 0;
507}
508
509struct xen_device_domain_owner {
510 domid_t domain;
511 struct pci_dev *dev;
512 struct list_head list;
513};
514
515static DEFINE_SPINLOCK(dev_domain_list_spinlock);
516static struct list_head dev_domain_list = LIST_HEAD_INIT(dev_domain_list);
517
518static struct xen_device_domain_owner *find_device(struct pci_dev *dev)
519{
520 struct xen_device_domain_owner *owner;
521
522 list_for_each_entry(owner, &dev_domain_list, list) {
523 if (owner->dev == dev)
524 return owner;
525 }
526 return NULL;
527}
528
529int xen_find_device_domain_owner(struct pci_dev *dev)
530{
531 struct xen_device_domain_owner *owner;
532 int domain = -ENODEV;
533
534 spin_lock(&dev_domain_list_spinlock);
535 owner = find_device(dev);
536 if (owner)
537 domain = owner->domain;
538 spin_unlock(&dev_domain_list_spinlock);
539 return domain;
540}
541EXPORT_SYMBOL_GPL(xen_find_device_domain_owner);
542
543int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain)
544{
545 struct xen_device_domain_owner *owner;
546
547 owner = kzalloc(sizeof(struct xen_device_domain_owner), GFP_KERNEL);
548 if (!owner)
549 return -ENODEV;
550
551 spin_lock(&dev_domain_list_spinlock);
552 if (find_device(dev)) {
553 spin_unlock(&dev_domain_list_spinlock);
554 kfree(owner);
555 return -EEXIST;
556 }
557 owner->domain = domain;
558 owner->dev = dev;
559 list_add_tail(&owner->list, &dev_domain_list);
560 spin_unlock(&dev_domain_list_spinlock);
561 return 0;
562}
563EXPORT_SYMBOL_GPL(xen_register_device_domain_owner);
564
565int xen_unregister_device_domain_owner(struct pci_dev *dev)
566{
567 struct xen_device_domain_owner *owner;
568
569 spin_lock(&dev_domain_list_spinlock);
570 owner = find_device(dev);
571 if (!owner) {
572 spin_unlock(&dev_domain_list_spinlock);
573 return -ENODEV;
574 }
575 list_del(&owner->list);
576 spin_unlock(&dev_domain_list_spinlock);
577 kfree(owner);
578 return 0;
579}
580EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner);
581#endif
582
