linux-kernel - [Patch Part2 V1 13/14] iommu/vt-d: update device to static identity domain mapping for PCI hotplug

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Message-Id: <1389085234-22296-14-git-send-email-jiang.liu@linux.intel.com>
Date:	Tue,  7 Jan 2014 17:00:33 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Joerg Roedel <joro@...tes.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Ashok Raj <ashok.raj@...el.com>,
	Yijing Wang <wangyijing@...wei.com>,
	Tony Luck <tony.luck@...el.com>,
	iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: [Patch Part2 V1 13/14] iommu/vt-d: update device to static identity domain mapping for PCI hotplug

When PCI device hotplug event happen, we need to update device to
static identity domain mapping relationship to maintain correct
device to domain mapping.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 drivers/iommu/intel-iommu.c |   17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 6a9a314..83e3ed4 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3659,13 +3659,26 @@ static int device_notifier(struct notifier_block *nb,
 		return 0;
 
 	down_read(&dmar_global_lock);
-	if (action == BUS_NOTIFY_UNBOUND_DRIVER && !iommu_pass_through) {
-		domain_remove_one_dev_info(domain, pdev);
+	switch (action) {
+	case BUS_NOTIFY_ADD_DEVICE:
+		if (iommu_should_identity_map(pdev, 1))
+			domain_add_dev_info(si_domain, pdev,
+					    hw_pass_through ?
+					    CONTEXT_TT_PASS_THROUGH :
+					    CONTEXT_TT_MULTI_LEVEL);
+		break;
 
+	case BUS_NOTIFY_UNBOUND_DRIVER:
+		if (iommu_pass_through)
+			break;
+		/* fall through */
+	case BUS_NOTIFY_DEL_DEVICE:
+		domain_remove_one_dev_info(domain, pdev);
 		if (!(domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE) &&
 		    !(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY) &&
 		    list_empty(&domain->devices))
 			domain_exit(domain);
+		break;
 	}
 	up_read(&dmar_global_lock);
 
-- 
1.7.10.4

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