linux-kernel - [v6 8/8] iommu, x86: Properly handler PI for IOMMU hotplug

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Message-Id: <1432191555-3516-9-git-send-email-feng.wu@intel.com>
Date:	Thu, 21 May 2015 14:59:15 +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: [v6 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 file changed, 3 insertions(+)

diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 776b65a..a0de9b9 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -1347,6 +1347,9 @@ 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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