linux-kernel - [PATCH 4.19 202/267] PCI: Add ACS quirk for iProc PAXB

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200619141658.429157336@linuxfoundation.org>
Date:   Fri, 19 Jun 2020 16:33:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Abhinav Ratna <abhinav.ratna@...adcom.com>,
        Srinath Mannam <srinath.mannam@...adcom.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Scott Branden <scott.branden@...adcom.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 202/267] PCI: Add ACS quirk for iProc PAXB

From: Abhinav Ratna <abhinav.ratna@...adcom.com>

[ Upstream commit 46b2c32df7a462d0e64b68c513e5c4c1b2a399a7 ]

iProc PAXB Root Ports don't advertise an ACS capability, but they do not
allow peer-to-peer transactions between Root Ports.  Add an ACS quirk so
each Root Port can be in a separate IOMMU group.

[bhelgaas: commit log, comment, use common implementation style]
Link: https://lore.kernel.org/r/1566275985-25670-1-git-send-email-srinath.mannam@broadcom.com
Signed-off-by: Abhinav Ratna <abhinav.ratna@...adcom.com>
Signed-off-by: Srinath Mannam <srinath.mannam@...adcom.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Scott Branden <scott.branden@...adcom.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/quirks.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 92892b1c35fa..013b84880e1d 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -4543,6 +4543,19 @@ static int pci_quirk_mf_endpoint_acs(struct pci_dev *dev, u16 acs_flags)
 	return acs_flags ? 0 : 1;
 }
 
+static int pci_quirk_brcm_acs(struct pci_dev *dev, u16 acs_flags)
+{
+	/*
+	 * iProc PAXB Root Ports don't advertise an ACS capability, but
+	 * they do not allow peer-to-peer transactions between Root Ports.
+	 * Allow each Root Port to be in a separate IOMMU group by masking
+	 * SV/RR/CR/UF bits.
+	 */
+	acs_flags &= ~(PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF);
+
+	return acs_flags ? 0 : 1;
+}
+
 static const struct pci_dev_acs_enabled {
 	u16 vendor;
 	u16 device;
@@ -4634,6 +4647,7 @@ static const struct pci_dev_acs_enabled {
 	{ PCI_VENDOR_ID_AMPERE, 0xE00A, pci_quirk_xgene_acs },
 	{ PCI_VENDOR_ID_AMPERE, 0xE00B, pci_quirk_xgene_acs },
 	{ PCI_VENDOR_ID_AMPERE, 0xE00C, pci_quirk_xgene_acs },
+	{ PCI_VENDOR_ID_BROADCOM, 0xD714, pci_quirk_brcm_acs },
 	{ 0 }
 };
 
-- 
2.25.1