[PATCH v2 08/12] VT-d: move ats_device() to the sole file it's used from

[Jan Beulich <jbeulich@xxxxxxxx>]

..., thus allowing it to become static, and thus reducing scope overlap
between it and pci_ats_device(). There's nothing x86-specific about this
function anyway.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

--- a/xen/drivers/passthrough/vtd/extern.h
+++ b/xen/drivers/passthrough/vtd/extern.h
@@ -65,8 +65,6 @@ struct acpi_drhd_unit *ioapic_to_drhd(un
 struct acpi_drhd_unit *hpet_to_drhd(unsigned int hpet_id);
 struct acpi_rhsa_unit *drhd_to_rhsa(const struct acpi_drhd_unit *drhd);
 
-int ats_device(const struct pci_dev *, const struct acpi_drhd_unit *);
-
 int dev_invalidate_iotlb(struct vtd_iommu *iommu, u16 did,
                          u64 addr, unsigned int size_order, u64 type);
 
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1455,6 +1455,38 @@ static void __hwdom_init cf_check intel_
     }
 }
 
+static int ats_device(const struct pci_dev *pdev,
+                      const struct acpi_drhd_unit *drhd)
+{
+    unsigned int pos, expfl = 0;
+    const struct acpi_satc_unit *satc;
+
+    if ( !opt_ats || !iommu_qinval )
+        return 0;
+
+    if ( !ecap_queued_inval(drhd->iommu->ecap) ||
+         !ecap_dev_iotlb(drhd->iommu->ecap) )
+        return 0;
+
+    pos = pci_find_cap_offset(pdev->sbdf, PCI_CAP_ID_EXP);
+    if ( pos )
+        expfl = pci_conf_read16(pdev->sbdf, pos + PCI_EXP_FLAGS);
+
+    if ( MASK_EXTR(expfl, PCI_EXP_FLAGS_TYPE) != PCI_EXP_TYPE_RC_END &&
+         !acpi_find_matched_atsr_unit(pdev) )
+        return 0;
+
+    satc = acpi_find_matched_satc_unit(pdev);
+    if ( opt_ats < 0 && (!satc || !satc->atc_required) )
+        return 0;
+
+    pos = pci_find_ext_capability(pdev->sbdf, PCI_EXT_CAP_ID_ATS);
+    if ( pos )
+        drhd->iommu->flush_dev_iotlb = true;
+
+    return pos;
+}
+
 /*
  * This function returns
  * - a negative errno value upon error,
--- a/xen/drivers/passthrough/vtd/x86/ats.c
+++ b/xen/drivers/passthrough/vtd/x86/ats.c
@@ -28,37 +28,6 @@
 #include "../extern.h"
 #include "../../ats.h"
 
-int ats_device(const struct pci_dev *pdev, const struct acpi_drhd_unit *drhd)
-{
-    unsigned int pos, expfl = 0;
-    const struct acpi_satc_unit *satc;
-
-    if ( !opt_ats || !iommu_qinval )
-        return 0;
-
-    if ( !ecap_queued_inval(drhd->iommu->ecap) ||
-         !ecap_dev_iotlb(drhd->iommu->ecap) )
-        return 0;
-
-    pos = pci_find_cap_offset(pdev->sbdf, PCI_CAP_ID_EXP);
-    if ( pos )
-        expfl = pci_conf_read16(pdev->sbdf, pos + PCI_EXP_FLAGS);
-
-    if ( MASK_EXTR(expfl, PCI_EXP_FLAGS_TYPE) != PCI_EXP_TYPE_RC_END &&
-         !acpi_find_matched_atsr_unit(pdev) )
-        return 0;
-
-    satc = acpi_find_matched_satc_unit(pdev);
-    if ( opt_ats < 0 && (!satc || !satc->atc_required) )
-        return 0;
-
-    pos = pci_find_ext_capability(pdev->sbdf, PCI_EXT_CAP_ID_ATS);
-    if ( pos )
-        drhd->iommu->flush_dev_iotlb = true;
-
-    return pos;
-}
-
 static bool device_in_domain(const struct vtd_iommu *iommu,
                              const struct pci_dev *pdev, uint16_t did)
 {