[PATCH 3.16 146/305] powerpc/pseries: Fix PCI config address for DDW

Path	csiph.com!eternal-september.org!feeder.eternal-september.org!aioe.org!bofh.it!news.nic.it!robomod
From	Ben Hutchings <ben@decadent.org.uk>
Newsgroups	linux.kernel
Subject	[PATCH 3.16 146/305] powerpc/pseries: Fix PCI config address for DDW
Date	Sun, 14 Aug 2016 20:00:03 +0200
Message-ID	<s67Rx-2Hd-65@gated-at.bofh.it> (permalink)
References	<s5LnX-4sk-3@gated-at.bofh.it>
X-Original-To	linux-kernel@vger.kernel.org, stable@vger.kernel.org
Content-Type	text/plain; charset="UTF-8"
Content-Disposition	inline
Content-Transfer-Encoding	8bit
MIME-Version	1.0
X-Mailer	LinuxStableQueue (scripts by bwh)
X-Sa-Exim-Connect-IP	92.40.249.202
X-Sa-Exim-Mail-From	ben@decadent.org.uk
X-Sa-Exim-Scanned	No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false
Sender	robomod@news.nic.it
List-ID	<linux-kernel.vger.kernel.org>
X-Mailing-List	linux-kernel@vger.kernel.org
Approved	robomod@news.nic.it
Lines	47
Organization	linux.* mail to news gateway
X-Original-Cc	akpm@linux-foundation.org, "Guilherme G. Piccoli" <gpiccoli@linux.vnet.ibm.com>, "Gavin Shan" <gwshan@linux.vnet.ibm.com>, "Michael Ellerman" <mpe@ellerman.id.au>
X-Original-Date	Sat, 13 Aug 2016 18:42:51 +0100
X-Original-Message-ID	<lsq.1471110171.113850184@decadent.org.uk>
X-Original-References	<lsq.1471110169.907390585@decadent.org.uk>
X-Original-Sender	linux-kernel-owner@vger.kernel.org
Xref	csiph.com linux.kernel:1462209

Show key headers only | View raw

3.16.37-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Gavin Shan <gwshan@linux.vnet.ibm.com>

commit 8a934efe94347eee843aeea65bdec8077a79e259 upstream.

In commit 8445a87f7092 "powerpc/iommu: Remove the dependency on EEH
struct in DDW mechanism", the PE address was replaced with the PCI
config address in order to remove dependency on EEH. According to PAPR
spec, firmware (pHyp or QEMU) should accept "xxBBSSxx" format PCI config
address, not "xxxxBBSS" provided by the patch. Note that "BB" is PCI bus
number and "SS" is the combination of slot and function number.

This fixes the PCI address passed to DDW RTAS calls.

Fixes: 8445a87f7092 ("powerpc/iommu: Remove the dependency on EEH struct in DDW mechanism")
Reported-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Tested-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 arch/powerpc/platforms/pseries/iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -841,7 +841,7 @@ static int query_ddw(struct pci_dev *dev
 	dn = pci_device_to_OF_node(dev);
 	pdn = PCI_DN(dn);
 	buid = pdn->phb->buid;
-	cfg_addr = (pdn->busno << 8) | pdn->devfn;
+	cfg_addr = ((pdn->busno << 16) | (pdn->devfn << 8));
 
 	ret = rtas_call(ddw_avail[0], 3, 5, (u32 *)query,
 		  cfg_addr, BUID_HI(buid), BUID_LO(buid));
@@ -870,7 +870,7 @@ static int create_ddw(struct pci_dev *de
 	dn = pci_device_to_OF_node(dev);
 	pdn = PCI_DN(dn);
 	buid = pdn->phb->buid;
-	cfg_addr = (pdn->busno << 8) | pdn->devfn;
+	cfg_addr = ((pdn->busno << 16) | (pdn->devfn << 8));
 
 	do {
 		/* extra outputs are LIOBN and dma-addr (hi, lo) */

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

[PATCH 3.16 146/305] powerpc/pseries: Fix PCI config address for DDW Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:00 +0200

csiph-web