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-rw-r--r--arch/x86/pci/xen.c56
1 files changed, 28 insertions, 28 deletions
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index fe008309ffec..f567965c0620 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -327,13 +327,12 @@ int __init pci_xen_hvm_init(void)
327} 327}
328 328
329#ifdef CONFIG_XEN_DOM0 329#ifdef CONFIG_XEN_DOM0
330static int xen_register_pirq(u32 gsi, int triggering) 330static int xen_register_pirq(u32 gsi, int gsi_override, int triggering)
331{ 331{
332 int rc, pirq, irq = -1; 332 int rc, pirq, irq = -1;
333 struct physdev_map_pirq map_irq; 333 struct physdev_map_pirq map_irq;
334 int shareable = 0; 334 int shareable = 0;
335 char *name; 335 char *name;
336 bool gsi_override = false;
337 336
338 if (!xen_pv_domain()) 337 if (!xen_pv_domain())
339 return -1; 338 return -1;
@@ -345,31 +344,12 @@ static int xen_register_pirq(u32 gsi, int triggering)
345 shareable = 1; 344 shareable = 1;
346 name = "ioapic-level"; 345 name = "ioapic-level";
347 } 346 }
348
349 pirq = xen_allocate_pirq_gsi(gsi); 347 pirq = xen_allocate_pirq_gsi(gsi);
350 if (pirq < 0) 348 if (pirq < 0)
351 goto out; 349 goto out;
352 350
353 /* Before we bind the GSI to a Linux IRQ, check whether 351 if (gsi_override >= 0)
354 * we need to override it with bus_irq (IRQ) value. Usually for 352 irq = xen_bind_pirq_gsi_to_irq(gsi_override, pirq, shareable, name);
355 * IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so:
356 * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
357 * but there are oddballs where the IRQ != GSI:
358 * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
359 * which ends up being: gsi_to_irq[9] == 20
360 * (which is what acpi_gsi_to_irq ends up calling when starting the
361 * the ACPI interpreter and keels over since IRQ 9 has not been
362 * setup as we had setup IRQ 20 for it).
363 */
364 if (gsi == acpi_sci_override_gsi) {
365 /* Check whether the GSI != IRQ */
366 acpi_gsi_to_irq(gsi, &irq);
367 if (irq != gsi)
368 /* Bugger, we MUST have that IRQ. */
369 gsi_override = true;
370 }
371 if (gsi_override)
372 irq = xen_bind_pirq_gsi_to_irq(irq, pirq, shareable, name);
373 else 353 else
374 irq = xen_bind_pirq_gsi_to_irq(gsi, pirq, shareable, name); 354 irq = xen_bind_pirq_gsi_to_irq(gsi, pirq, shareable, name);
375 if (irq < 0) 355 if (irq < 0)
@@ -392,7 +372,7 @@ out:
392 return irq; 372 return irq;
393} 373}
394 374
395static int xen_register_gsi(u32 gsi, int triggering, int polarity) 375static int xen_register_gsi(u32 gsi, int gsi_override, int triggering, int polarity)
396{ 376{
397 int rc, irq; 377 int rc, irq;
398 struct physdev_setup_gsi setup_gsi; 378 struct physdev_setup_gsi setup_gsi;
@@ -403,7 +383,7 @@ static int xen_register_gsi(u32 gsi, int triggering, int polarity)
403 printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n", 383 printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
404 gsi, triggering, polarity); 384 gsi, triggering, polarity);
405 385
406 irq = xen_register_pirq(gsi, triggering); 386 irq = xen_register_pirq(gsi, gsi_override, triggering);
407 387
408 setup_gsi.gsi = gsi; 388 setup_gsi.gsi = gsi;
409 setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1); 389 setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
@@ -425,6 +405,8 @@ static __init void xen_setup_acpi_sci(void)
425 int rc; 405 int rc;
426 int trigger, polarity; 406 int trigger, polarity;
427 int gsi = acpi_sci_override_gsi; 407 int gsi = acpi_sci_override_gsi;
408 int irq = -1;
409 int gsi_override = -1;
428 410
429 if (!gsi) 411 if (!gsi)
430 return; 412 return;
@@ -441,7 +423,25 @@ static __init void xen_setup_acpi_sci(void)
441 printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d " 423 printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
442 "polarity=%d\n", gsi, trigger, polarity); 424 "polarity=%d\n", gsi, trigger, polarity);
443 425
444 gsi = xen_register_gsi(gsi, trigger, polarity); 426 /* Before we bind the GSI to a Linux IRQ, check whether
427 * we need to override it with bus_irq (IRQ) value. Usually for
428 * IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so:
429 * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
430 * but there are oddballs where the IRQ != GSI:
431 * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
432 * which ends up being: gsi_to_irq[9] == 20
433 * (which is what acpi_gsi_to_irq ends up calling when starting the
434 * the ACPI interpreter and keels over since IRQ 9 has not been
435 * setup as we had setup IRQ 20 for it).
436 */
437 /* Check whether the GSI != IRQ */
438 if (acpi_gsi_to_irq(gsi, &irq) == 0) {
439 if (irq >= 0 && irq != gsi)
440 /* Bugger, we MUST have that IRQ. */
441 gsi_override = irq;
442 }
443
444 gsi = xen_register_gsi(gsi, gsi_override, trigger, polarity);
445 printk(KERN_INFO "xen: acpi sci %d\n", gsi); 445 printk(KERN_INFO "xen: acpi sci %d\n", gsi);
446 446
447 return; 447 return;
@@ -450,7 +450,7 @@ static __init void xen_setup_acpi_sci(void)
450static int acpi_register_gsi_xen(struct device *dev, u32 gsi, 450static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
451 int trigger, int polarity) 451 int trigger, int polarity)
452{ 452{
453 return xen_register_gsi(gsi, trigger, polarity); 453 return xen_register_gsi(gsi, -1 /* no GSI override */, trigger, polarity);
454} 454}
455 455
456static int __init pci_xen_initial_domain(void) 456static int __init pci_xen_initial_domain(void)
@@ -489,7 +489,7 @@ void __init xen_setup_pirqs(void)
489 if (acpi_get_override_irq(irq, &trigger, &polarity) == -1) 489 if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
490 continue; 490 continue;
491 491
492 xen_register_pirq(irq, 492 xen_register_pirq(irq, -1 /* no GSI override */,
493 trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE); 493 trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
494 } 494 }
495} 495}