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From:   Lu Baolu <baolu.lu@linux.intel.com>
To:     David Woodhouse <dwmw2@infradead.org>,
        Joerg Roedel <joro@8bytes.org>
Cc:     ashok.raj@intel.com, jacob.jun.pan@intel.com, kevin.tian@intel.com,
        jamessewart@arista.com, tmurphy@arista.com, dima@arista.com,
        sai.praneeth.prakhya@intel.com, iommu@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, Lu Baolu <baolu.lu@linux.intel.com>
Subject: [PATCH v4 03/15] iommu/vt-d: Expose ISA direct mapping region via iommu_get_resv_regions
Date:   Sat, 25 May 2019 13:41:24 +0800
Message-Id: <20190525054136.27810-4-baolu.lu@linux.intel.com>
In-Reply-To: <20190525054136.27810-1-baolu.lu@linux.intel.com>
References: <20190525054136.27810-1-baolu.lu@linux.intel.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

To support mapping ISA region via iommu_group_create_direct_mappings,
make sure its exposed by iommu_get_resv_regions.

Signed-off-by: James Sewart <jamessewart@arista.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 drivers/iommu/intel-iommu.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 4d0fa3097f5d..c42317e27b0c 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5520,6 +5520,20 @@ static void intel_iommu_get_resv_regions(struct device *device,
 	}
 	rcu_read_unlock();
 
+#ifdef CONFIG_INTEL_IOMMU_FLOPPY_WA
+	if (dev_is_pci(device)) {
+		struct pci_dev *pdev = to_pci_dev(device);
+
+		if ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA) {
+			reg = iommu_alloc_resv_region(0, 1UL << 24, 0,
+						      IOMMU_RESV_DIRECT,
+						      GFP_KERNEL);
+			if (reg)
+				list_add_tail(&reg->list, head);
+		}
+	}
+#endif /* CONFIG_INTEL_IOMMU_FLOPPY_WA */
+
 	reg = iommu_alloc_resv_region(IOAPIC_RANGE_START,
 				      IOAPIC_RANGE_END - IOAPIC_RANGE_START + 1,
 				      0, IOMMU_RESV_MSI, GFP_KERNEL);
-- 
2.17.1