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iommu, x86: Setup Posted-Interrupts capability for Intel iommu

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Set Posted-Interrupts capability for Intel iommu when Interrupt
Remapping is enabled, clear it when disabled.

Signed-off-by: Feng Wu <feng.wu@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Joerg Roedel <joro@8bytes.org>
Cc: jiang.liu@linux.intel.com
Cc: iommu@lists.linux-foundation.org
Cc: dwmw2@infradead.org
Link: http://lkml.kernel.org/r/1433827237-3382-9-git-send-email-feng.wu@intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Feng Wu
2015-06-09 13:20:35 +08:00
committed by Thomas Gleixner
parent 07c09787b2
commit 3d9b98f4ec
3 changed files with 35 additions and 0 deletions
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30
drivers/iommu/intel_irq_remapping.c
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@@ -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: