[PATCH v2 -next] iommu/arm-smmu-v3: Fix build error without CONFIG_PCI_ATS

[YueHaibing]

If CONFIG_PCI_ATS is not set, building fails:

drivers/iommu/arm-smmu-v3.c: In function arm_smmu_ats_supported:
drivers/iommu/arm-smmu-v3.c:2325:35: error: struct pci_dev has no member named ats_cap; did you mean msi_cap?
  return !pdev->untrusted && pdev->ats_cap;
                                   ^~~~~~~

ats_cap should only used when CONFIG_PCI_ATS is defined,
so use #ifdef block to guard this.

Fixes: bfff88ec1afe ("iommu/arm-smmu-v3: Rework enabling/disabling of ATS for PCI masters")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
v2: Add arm_smmu_ats_supported() of no CONFIG_PCI_ATS
---
 drivers/iommu/arm-smmu-v3.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 66bf641..8da93e7 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2311,6 +2311,7 @@ static void arm_smmu_install_ste_for_dev(struct arm_smmu_master *master)
 	}
 }
 
+#ifdef CONFIG_PCI_ATS
 static bool arm_smmu_ats_supported(struct arm_smmu_master *master)
 {
 	struct pci_dev *pdev;
@@ -2324,6 +2325,12 @@ static bool arm_smmu_ats_supported(struct arm_smmu_master *master)
 	pdev = to_pci_dev(master->dev);
 	return !pdev->untrusted && pdev->ats_cap;
 }
+#else
+static bool arm_smmu_ats_supported(struct arm_smmu_master *master)
+{
+	return false;
+}
+#endif
 
 static void arm_smmu_enable_ats(struct arm_smmu_master *master)
 {
-- 
2.7.4