linux-kernel - [PATCH] PCI: Add PCIE ACS quirk for IPROC PAXB

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Message-Id: <1566275985-25670-1-git-send-email-srinath.mannam@broadcom.com>
Date:   Tue, 20 Aug 2019 10:09:45 +0530
From:   Srinath Mannam <srinath.mannam@...adcom.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     bcm-kernel-feedback-list@...adcom.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Abhinav Ratna <abhinav.ratna@...adcom.com>,
        Srinath Mannam <srinath.mannam@...adcom.com>
Subject: [PATCH] PCI: Add PCIE ACS quirk for IPROC PAXB

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

IPROC PAXB RC doesn't support ACS capabilities and control registers.
Add quirk to have separate IOMMU groups for all EPs and functions connected
to root port, by masking RR/CR/SV/UF bits.

Signed-off-by: Abhinav Ratna <abhinav.ratna@...adcom.com>
Signed-off-by: Srinath Mannam <srinath.mannam@...adcom.com>
---
 drivers/pci/quirks.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 0f16acc..f9584c0 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -4466,6 +4466,21 @@ static int pci_quirk_mf_endpoint_acs(struct pci_dev *dev, u16 acs_flags)
 	return acs_flags ? 0 : 1;
 }
 
+static int pcie_quirk_brcm_bridge_acs(struct pci_dev *dev, u16 acs_flags)
+{
+	/*
+	 * IPROC PAXB RC doesn't support ACS capabilities and control registers.
+	 * Add quirk to to have separate IOMMU groups for all EPs and functions
+	 * connected to root port, by masking RR/CR/SV/UF bits.
+	 */
+
+	u16 flags = (PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_SV);
+	int ret = acs_flags & ~flags ? 0 : 1;
+
+	return ret;
+}
+
+
 static const struct pci_dev_acs_enabled {
 	u16 vendor;
 	u16 device;
@@ -4559,6 +4574,7 @@ 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, pcie_quirk_brcm_bridge_acs },
 	{ 0 }
 };
 
-- 
2.7.4