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From:   Zhangfei Gao <zhangfei.gao@linaro.org>
To:     Joerg Roedel <joro@8bytes.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Hanjun Guo <guohanjun@huawei.com>,
        Sudeep Holla <sudeep.holla@arm.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Len Brown <lenb@kernel.org>,
        jean-philippe <jean-philippe@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        kenneth-lee-2012@foxmail.com, Wangzhou <wangzhou1@hisilicon.com>
Cc:     linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
        iommu@lists.linux-foundation.org, linux-acpi@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org,
        Zhangfei Gao <zhangfei.gao@linaro.org>
Subject: [PATCH 0/2] Introduce PCI_FIXUP_IOMMU
Date:   Tue, 26 May 2020 19:49:07 +0800
Message-Id: <1590493749-13823-1-git-send-email-zhangfei.gao@linaro.org>
Sender: linux-crypto-owner@vger.kernel.org
Precedence: bulk

Some platform devices appear as PCI but are actually on the AMBA bus,
and they need fixup in drivers/pci/quirks.c handling iommu_fwnode.
Here introducing PCI_FIXUP_IOMMU, which is called after iommu_fwnode
is allocated, instead of reusing PCI_FIXUP_FINAL since it will slow
down iommu probing as all devices in fixup final list will be
reprocessed, suggested by Joerg, [1]

For example:
Hisilicon platform device need fixup in
drivers/pci/quirks.c handling fwspec->can_stall, which is introduced in [2]

+static void quirk_huawei_pcie_sva(struct pci_dev *pdev)
+{
+    struct iommu_fwspec *fwspec;
+
+    pdev->eetlp_prefix_path = 1;
+    fwspec = dev_iommu_fwspec_get(&pdev->dev);
+    if (fwspec)
+        fwspec->can_stall = 1;
+}
+
+DECLARE_PCI_FIXUP_IOMMU(PCI_VENDOR_ID_HUAWEI, 0xa250, quirk_huawei_pcie_sva);
+DECLARE_PCI_iFIXUP_IOMMU(PCI_VENDOR_ID_HUAWEI, 0xa251, quirk_huawei_pcie_sva); 

[1] https://www.spinics.net/lists/iommu/msg44591.html
[2] https://www.spinics.net/lists/linux-pci/msg94559.html

Zhangfei Gao (2):
  PCI: Introduce PCI_FIXUP_IOMMU
  iommu: calling pci_fixup_iommu in iommu_fwspec_init

 drivers/iommu/iommu.c             | 4 ++++
 drivers/pci/quirks.c              | 7 +++++++
 include/asm-generic/vmlinux.lds.h | 3 +++
 include/linux/pci.h               | 8 ++++++++
 4 files changed, 22 insertions(+)

-- 
2.7.4