linux-kernel - [PATCH 4.14 033/193] PCI: Set Cavium ACS capability quirk flags to assert RR/CR/SV/UF

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Date:   Tue, 28 Nov 2017 11:24:40 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Vadim Lomovtsev <Vadim.Lomovtsev@...ium.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 4.14 033/193] PCI: Set Cavium ACS capability quirk flags to assert RR/CR/SV/UF

4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: Vadim Lomovtsev <Vadim.Lomovtsev@...ium.com>

commit 7f342678634f16795892677204366e835e450dda upstream.

The Cavium ThunderX (CN8XXX) family of PCIe Root Ports does not advertise
an ACS capability.  However, the RTL internally implements similar
protection as if ACS had Request Redirection, Completion Redirection,
Source Validation, and Upstream Forwarding features enabled.

Change Cavium ACS capabilities quirk flags accordingly.

Fixes: b404bcfbf035 ("PCI: Add ACS quirk for all Cavium devices")
Signed-off-by: Vadim Lomovtsev <Vadim.Lomovtsev@...ium.com>
[bhelgaas: tidy changelog, comment, stable tag]
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pci/quirks.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -4215,12 +4215,14 @@ static int pci_quirk_amd_sb_acs(struct p
 static int pci_quirk_cavium_acs(struct pci_dev *dev, u16 acs_flags)
 {
 	/*
-	 * Cavium devices matching this quirk do not perform peer-to-peer
-	 * with other functions, allowing masking out these bits as if they
-	 * were unimplemented in the ACS capability.
+	 * Cavium root ports don't advertise an ACS capability.  However,
+	 * the RTL internally implements similar protection as if ACS had
+	 * Request Redirection, Completion Redirection, Source Validation,
+	 * and Upstream Forwarding features enabled.  Assert that the
+	 * hardware implements and enables equivalent ACS functionality for
+	 * these flags.
 	 */
-	acs_flags &= ~(PCI_ACS_SV | PCI_ACS_TB | PCI_ACS_RR |
-		       PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_DT);
+	acs_flags &= ~(PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_SV | PCI_ACS_UF);
 
 	if (!((dev->device >= 0xa000) && (dev->device <= 0xa0ff)))
 		return -ENOTTY;