linux-kernel - [32/55] PCI: ARI is a PCIe v2 feature

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Date:	Fri, 05 Aug 2011 17:02:02 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Don Dutile <ddutile@...hat.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: [32/55] PCI: ARI is a PCIe v2 feature

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Chris Wright <chrisw@...s-sol.org>

commit 864d296cf948aef0fa32b81407541572583f7572 upstream.

The function pci_enable_ari() may mistakenly set the downstream port
of a v1 PCIe switch in ARI Forwarding mode.  This is a PCIe v2 feature,
and with an SR-IOV device on that switch port believing the switch above
is ARI capable it may attempt to use functions 8-255, translating into
invalid (non-zero) device numbers for that bus.  This has been seen
to cause Completion Timeouts and general misbehaviour including hangs
and panics.

Acked-by: Don Dutile <ddutile@...hat.com>
Tested-by: Don Dutile <ddutile@...hat.com>
Signed-off-by: Chris Wright <chrisw@...s-sol.org>
Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/pci/pci.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1507,7 +1507,7 @@ void pci_enable_ari(struct pci_dev *dev)
 {
 	int pos;
 	u32 cap;
-	u16 ctrl;
+	u16 flags, ctrl;
 	struct pci_dev *bridge;
 
 	if (!dev->is_pcie || dev->devfn)
@@ -1525,6 +1525,11 @@ void pci_enable_ari(struct pci_dev *dev)
 	if (!pos)
 		return;
 
+	/* ARI is a PCIe v2 feature */
+	pci_read_config_word(bridge, pos + PCI_EXP_FLAGS, &flags);
+	if ((flags & PCI_EXP_FLAGS_VERS) < 2)
+		return;
+
 	pci_read_config_dword(bridge, pos + PCI_EXP_DEVCAP2, &cap);
 	if (!(cap & PCI_EXP_DEVCAP2_ARI))
 		return;


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