static int __init intel_irq_remapping_supported(void)
{
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
if (disable_irq_remap)
return 0;
if (irq_remap_broken) {
printk(KERN_WARNING
"This system BIOS has enabled interrupt remapping\n"
"on a chipset that contains an erratum making that\n"
"feature unstable. To maintain system stability\n"
"interrupt remapping is being disabled. Please\n"
"contact your BIOS vendor for an update\n");
add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
disable_irq_remap = 1;
return 0;
}
if (!dmar_ir_support())
return 0;
for_each_iommu(iommu, drhd)
if (!ecap_ir_support(iommu->ecap))
return 0;
return 1;
}
int __init intr_remapping_supported(void)
{
struct dmar_drhd_unit *drhd;
if (disable_intremap)
return 0;
if (!dmar_ir_support())
return 0;
for_each_drhd_unit(drhd) {
struct intel_iommu *iommu = drhd->iommu;
if (!ecap_ir_support(iommu->ecap))
return 0;
}
return 1;
}
static int __init intel_prepare_irq_remapping(void)
{
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
if (irq_remap_broken) {
printk(KERN_WARNING
"This system BIOS has enabled interrupt remapping\n"
"on a chipset that contains an erratum making that\n"
"feature unstable. To maintain system stability\n"
"interrupt remapping is being disabled. Please\n"
"contact your BIOS vendor for an update\n");
add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
return -ENODEV;
}
if (dmar_table_init() < 0)
return -ENODEV;
if (!dmar_ir_support())
return -ENODEV;
if (parse_ioapics_under_ir() != 1) {
printk(KERN_INFO "Not enabling interrupt remapping\n");
goto error;
}
/* First make sure all IOMMUs support IRQ remapping */
for_each_iommu(iommu, drhd)
if (!ecap_ir_support(iommu->ecap))
goto error;
/* Do the allocations early */
for_each_iommu(iommu, drhd)
if (intel_setup_irq_remapping(iommu))
goto error;
return 0;
error:
intel_cleanup_irq_remapping();
return -ENODEV;
}
static int __init intel_prepare_irq_remapping(void)
{
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
int eim = 0;
if (irq_remap_broken) {
pr_warn("This system BIOS has enabled interrupt remapping\n"
"on a chipset that contains an erratum making that\n"
"feature unstable. To maintain system stability\n"
"interrupt remapping is being disabled. Please\n"
"contact your BIOS vendor for an update\n");
add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
return -ENODEV;
}
if (dmar_table_init() < 0)
return -ENODEV;
if (!dmar_ir_support())
return -ENODEV;
if (parse_ioapics_under_ir()) {
pr_info("Not enabling interrupt remapping\n");
goto error;
}
/* First make sure all IOMMUs support IRQ remapping */
for_each_iommu(iommu, drhd)
if (!ecap_ir_support(iommu->ecap))
goto error;
/* Detect remapping mode: lapic or x2apic */
if (x2apic_supported()) {
eim = !dmar_x2apic_optout();
if (!eim) {
pr_info("x2apic is disabled because BIOS sets x2apic opt out bit.");
pr_info("Use 'intremap=no_x2apic_optout' to override the BIOS setting.\n");
}
}
for_each_iommu(iommu, drhd) {
if (eim && !ecap_eim_support(iommu->ecap)) {
pr_info("%s does not support EIM\n", iommu->name);
eim = 0;
}
}
eim_mode = eim;
if (eim)
pr_info("Queued invalidation will be enabled to support x2apic and Intr-remapping.\n");
/* Do the initializations early */
for_each_iommu(iommu, drhd) {
if (intel_setup_irq_remapping(iommu)) {
pr_err("Failed to setup irq remapping for %s\n",
iommu->name);
goto error;
}
}
return 0;
error:
intel_cleanup_irq_remapping();
return -ENODEV;
}
