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Message-Id: <1432098937-19527-10-git-send-email-feng.wu@intel.com>
Date: Wed, 20 May 2015 13:15:37 +0800
From: Feng Wu <feng.wu@...el.com>
To: joro@...tes.org, dwmw2@...radead.org
Cc: tglx@...utronix.de, jiang.liu@...ux.intel.com,
iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
Feng Wu <feng.wu@...el.com>
Subject: [v5 9/9] iommu, x86: Properly handler PI for IOMMU hotplug
Return error when inserting a new IOMMU which doesn't support PI
if PI is currently in use.
Signed-off-by: Feng Wu <feng.wu@...el.com>
---
drivers/iommu/intel_irq_remapping.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index ba141e9..d1b3779 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -1348,6 +1348,9 @@ int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert)
return -EINVAL;
if (!ecap_ir_support(iommu->ecap))
return 0;
+ if (irq_remapping_cap(IRQ_POSTING_CAP) &&
+ !cap_pi_support(iommu->cap))
+ return -EBUSY;
if (insert) {
if (!iommu->ir_table)
--
2.1.0
--
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