diff options
Diffstat (limited to 'drivers/iommu/intel_irq_remapping.c')
| -rw-r--r-- | drivers/iommu/intel_irq_remapping.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c index 3bcb459905c4..0f57af72d8f8 100644 --- a/drivers/iommu/intel_irq_remapping.c +++ b/drivers/iommu/intel_irq_remapping.c @@ -581,6 +581,26 @@ error: return -ENODEV; } +/* + * Set Posted-Interrupts capability. + */ +static inline void set_irq_posting_cap(void) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu; + + if (!disable_irq_post) { + intel_irq_remap_ops.capability |= 1 << IRQ_POSTING_CAP; + + for_each_iommu(iommu, drhd) + if (!cap_pi_support(iommu->cap)) { + intel_irq_remap_ops.capability &= + ~(1 << IRQ_POSTING_CAP); + break; + } + } +} + static int __init intel_enable_irq_remapping(void) { struct dmar_drhd_unit *drhd; @@ -656,6 +676,8 @@ static int __init intel_enable_irq_remapping(void) irq_remapping_enabled = 1; + set_irq_posting_cap(); + pr_info("Enabled IRQ remapping in %s mode\n", eim ? "x2apic" : "xapic"); return eim ? IRQ_REMAP_X2APIC_MODE : IRQ_REMAP_XAPIC_MODE; @@ -856,6 +878,12 @@ static void disable_irq_remapping(void) iommu_disable_irq_remapping(iommu); } + + /* + * Clear Posted-Interrupts capability. + */ + if (!disable_irq_post) + intel_irq_remap_ops.capability &= ~(1 << IRQ_POSTING_CAP); } static int reenable_irq_remapping(int eim) @@ -883,6 +911,8 @@ static int reenable_irq_remapping(int eim) if (!setup) goto error; + set_irq_posting_cap(); + return 0; error: |