linux-kernel - Re: [PATCH 4/6] pci/dmar/sriov: use physfn to search drhd for VF

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Message-ID: <4BBE4209.3080900@oracle.com>
Date:	Thu, 08 Apr 2010 13:52:25 -0700
From:	Yinghai <yinghai.lu@...cle.com>
To:	Roland Dreier <rdreier@...co.com>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Chris Wright <chrisw@...s-sol.org>, David.Woodhouse@...el.com,
	fenghua.yu@...el.com, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 4/6] pci/dmar/sriov: use physfn to search drhd for VF

please check

Subject: [PATCH] pci/dmar/sriov: use physfn to search drhd for VF

When virtfn is used, we should use physfn to find correct drhd

-v2: add pci_physfn() Suggested by Roland Dreier <rdreier@...co.com>
     do can remove ifdef in dmar.c

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 drivers/pci/dmar.c  |    2 ++
 include/linux/pci.h |   10 ++++++++++
 2 files changed, 12 insertions(+)

Index: linux-2.6/drivers/pci/dmar.c
===================================================================
--- linux-2.6.orig/drivers/pci/dmar.c
+++ linux-2.6/drivers/pci/dmar.c
@@ -534,6 +534,8 @@ dmar_find_matched_drhd_unit(struct pci_d
 	struct dmar_drhd_unit *dmaru = NULL;
 	struct acpi_dmar_hardware_unit *drhd;
 
+	dev = pci_physfn(dev);
+
 	list_for_each_entry(dmaru, &dmar_drhd_units, list) {
 		drhd = container_of(dmaru->hdr,
 				    struct acpi_dmar_hardware_unit,
Index: linux-2.6/include/linux/pci.h
===================================================================
--- linux-2.6.orig/include/linux/pci.h
+++ linux-2.6/include/linux/pci.h
@@ -334,6 +334,16 @@ struct pci_dev {
 #endif
 };
 
+static inline struct pci_dev *pci_physfn(struct pci_dev *dev)
+{
+#ifdef CONFIG_PCI_IOV
+	if (dev->is_virtfn)
+		dev = dev->physfn;
+#endif
+
+	return dev;
+}
+
 extern struct pci_dev *alloc_pci_dev(void);
 
 #define pci_dev_b(n) list_entry(n, struct pci_dev, bus_list)
--
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