linux-kernel - [PATCH v3 3/3] PCI: Set dma-can-stall for HiSilicon chips

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Message-Id: <1615258837-12189-4-git-send-email-zhangfei.gao@linaro.org>
Date:   Tue,  9 Mar 2021 11:00:37 +0800
From:   Zhangfei Gao <zhangfei.gao@...aro.org>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        jean-philippe <jean-philippe@...aro.org>,
        kenneth-lee-2012@...mail.com, Wangzhou <wangzhou1@...ilicon.com>,
        kw@...ux.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zhangfei Gao <zhangfei.gao@...aro.org>
Subject: [PATCH v3 3/3] PCI: Set dma-can-stall for HiSilicon chips

HiSilicon KunPeng920 and KunPeng930 have devices appear as PCI but are
actually on the AMBA bus. These fake PCI devices can support SVA via
SMMU stall feature, by setting dma-can-stall for ACPI platforms.

Property dma-can-stall depends on patchset
https://lore.kernel.org/linux-iommu/20210302092644.2553014-1-jean-philippe@linaro.org/

Signed-off-by: Zhangfei Gao <zhangfei.gao@...aro.org>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
Signed-off-by: Zhou Wang <wangzhou1@...ilicon.com>
---
 drivers/pci/quirks.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 873d27f..b866cdf 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1827,10 +1827,23 @@ DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_HUAWEI, 0x1610, PCI_CLASS_BRIDGE_PCI
 
 static void quirk_huawei_pcie_sva(struct pci_dev *pdev)
 {
+	struct property_entry properties[] = {
+		PROPERTY_ENTRY_BOOL("dma-can-stall"),
+		{},
+	};
+
 	if (pdev->revision != 0x21 && pdev->revision != 0x30)
 		return;
 
 	pdev->pasid_no_tlp = 1;
+
+	/*
+	 * Set the dma-can-stall property on ACPI platforms. Device tree
+	 * can set it directly.
+	 */
+	if (!pdev->dev.of_node &&
+	    device_add_properties(&pdev->dev, properties))
+		pci_warn(pdev, "could not add stall property");
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_HUAWEI, 0xa250, quirk_huawei_pcie_sva);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_HUAWEI, 0xa251, quirk_huawei_pcie_sva);
-- 
2.9.5