linux-kernel - [PATCH 2/2] pciehp_driver.c: PCIe hot plug for Intel iommu

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Message-ID: <20091002211844.GA14352@linux-os.sc.intel.com>
Date:	Fri, 2 Oct 2009 14:18:44 -0700
From:	Fenghua Yu <fenghua.yu@...el.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Francois Isabelle <Francois.Isabelle@...kontron.com>
Cc:	Weidong Han <weidong.han@...el.com>,
	iommu@...ts.linux-foundation.org,
	Grant Grundler <grundler@...isc-linux.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] pciehp_driver.c: PCIe hot plug for Intel iommu - call IOMMU API in hot remove

IOMMU API iommu_detach_devcie() is called to hot remove a PCIe device.

A hot added device will be added into an IOMMU domain when it first does IOMMU
op. So there is no need to add more code for hot add. 

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>

---

 drivers/pci/pci-driver.c |    8 ++++++++
 1 files changed, 8 insertions(+)

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index e5d47be..b8f0592 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -17,6 +17,7 @@
 #include <linux/slab.h>
 #include <linux/sched.h>
 #include <linux/cpu.h>
+#include <linux/iommu.h>
 #include "pci.h"
 
 struct pci_dynid {
@@ -390,6 +391,13 @@ static int pci_device_remove(struct device * dev)
 	 */
 
 	pci_dev_put(pci_dev);
+
+	/*
+	 * Remove this pci device from its iommu domain.
+	 */
+	if (iommu_found())
+		iommu_detach_device(NULL, dev);
+
 	return 0;
 }
 
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