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Date: Mon, 2 Feb 2015 16:07:04 +0800
From: Feng Wu <feng.wu@...el.com>
To: dwmw2@...radead.org, joro@...tes.org
Cc: jiang.liu@...ux.intel.com, iommu@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, Feng Wu <feng.wu@...el.com>
Subject: [v4 8/8] 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 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 130a92b..0c2c317 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -1339,6 +1339,9 @@ 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)
--
1.7.1
--
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