linux-kernel - [PATCH v2] PCI: Enhance the ACS quirk for Cavium devices

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Date:   Mon, 11 Nov 2019 02:43:03 +0000
From:   George Cherian <george.cherian@...vell.com>
To:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "shannon.zhao@...ux.alibaba.com" <shannon.zhao@...ux.alibaba.com>,
        "Robert Richter" <rrichter@...vell.com>,
        George Cherian <gcherian@...vell.com>
Subject: [PATCH v2] PCI: Enhance the ACS quirk for Cavium devices

Enhance the ACS quirk for Cavium Processors. Add the root port
vendor ID's for ThunderX2 and ThunderX3 series  of processors.

Signed-off-by: George Cherian <george.cherian@...vell.com>
Reviewed-by: Robert Richter <rrichter@...vell.com>

---
 drivers/pci/quirks.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 44c4ae1abd00..19821d5d0ef3 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -4243,15 +4243,21 @@ static int pci_quirk_amd_sb_acs(struct pci_dev *dev, u16 acs_flags)
 
 static bool pci_quirk_cavium_acs_match(struct pci_dev *dev)
 {
+	if (!pci_is_pcie(dev) || pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
+		return false;
+
+	switch (dev->device) {
 	/*
-	 * Effectively selects all downstream ports for whole ThunderX 1
-	 * family by 0xf800 mask (which represents 8 SoCs), while the lower
-	 * bits of device ID are used to indicate which subdevice is used
-	 * within the SoC.
+	 * Effectively selects all downstream ports for whole ThunderX1
+	 * (which represents 8 SoCs).
 	 */
-	return (pci_is_pcie(dev) &&
-		(pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) &&
-		((dev->device & 0xf800) == 0xa000));
+	case 0xa000 ... 0xa7ff: /* ThunderX1 */
+	case 0xaf84:  /* ThunderX2 */
+	case 0xb884:  /* ThunderX3 */
+		return true;
+	default:
+		return false;
+	}
 }
 
 static int pci_quirk_cavium_acs(struct pci_dev *dev, u16 acs_flags)
-- 
2.17.1