From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-by2nam03on0126.outbound.protection.outlook.com ([104.47.42.126]:54752 "EHLO NAM03-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754839AbeDIAbV (ORCPT ); Sun, 8 Apr 2018 20:31:21 -0400 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Bjorn Helgaas , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 167/293] PCI: Enable ECRC only if device supports it Date: Mon, 9 Apr 2018 00:25:05 +0000 Message-ID: <20180409002239.163177-167-alexander.levin@microsoft.com> References: <20180409002239.163177-1-alexander.levin@microsoft.com> In-Reply-To: <20180409002239.163177-1-alexander.levin@microsoft.com> Content-Language: en-US Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org List-ID: From: Bjorn Helgaas [ Upstream commit 675734baa361cf044033bb60594dea33d8d8da36 ] John reported that an Intel QuickAssist crypto accelerator didn't work in a Dell PowerEdge R730. The problem seems to be that we enabled ECRC when the device doesn't support it: 85:00.0 Co-processor [0b40]: Intel Corporation DH895XCC Series QAT [8086:= 0435] Capabilities: [100 v1] Advanced Error Reporting AERCap: First Error Pointer: 00, GenCap- CGenEn+ ChkCap- ChkEn+ 1302fcf0d03e ("PCI: Configure *all* devices, not just hot-added ones") exposed the problem because it applies settings from the _HPX method to all devices, not just hot-added ones. The R730 supplies an _HPX method that allows the kernel to enable ECRC. Only enable ECRC if the device advertises support for it. Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1571798 Fixes: 1302fcf0d03e ("PCI: Configure *all* devices, not just hot-added ones= ") Reported-by: John Mazzie Signed-off-by: Bjorn Helgaas Signed-off-by: Sasha Levin --- drivers/pci/probe.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index a98be6db7e93..7f5178cb3415 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1536,6 +1536,11 @@ static void program_hpp_type2(struct pci_dev *dev, s= truct hpp_type2 *hpp) /* Initialize Advanced Error Capabilities and Control Register */ pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32); reg32 =3D (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or; + /* Don't enable ECRC generation or checking if unsupported */ + if (!(reg32 & PCI_ERR_CAP_ECRC_GENC)) + reg32 &=3D ~PCI_ERR_CAP_ECRC_GENE; + if (!(reg32 & PCI_ERR_CAP_ECRC_CHKC)) + reg32 &=3D ~PCI_ERR_CAP_ECRC_CHKE; pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32); =20 /* --=20 2.15.1