[Xen-devel] [PATCH 4 of 6] ats: Add new ATS helper functions

[Wei Wang <wei.wang2@xxxxxxx>]

# HG changeset patch
# User Wei Wang <wei.wang2@xxxxxxx>
# Date 1319472696 -7200
# Node ID 3dc5e805d9142cbe1074610879e258b6fab43409
# Parent  18088bd3e8f6c16b7aef3d8652f2b9878117fcd5
ats: Add new ATS helper functions

Signed-off-by Wei Wang <wei.wang2@xxxxxxx>

diff -r 18088bd3e8f6 -r 3dc5e805d914 xen/drivers/passthrough/x86/ats.c
--- a/xen/drivers/passthrough/x86/ats.c Mon Oct 24 18:11:32 2011 +0200
+++ b/xen/drivers/passthrough/x86/ats.c Mon Oct 24 18:11:36 2011 +0200
@@ -138,3 +138,42 @@ void disable_ats_device(int seg, int bus
                 seg, bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
 }
 
+int pci_ats_enabled(int seg, int bus, int devfn)
+{
+    u32 value;
+    int pos;
+
+    pos = pci_find_ext_capability(seg, bus, devfn, PCI_EXT_CAP_ID_ATS);
+    BUG_ON(!pos);
+
+    value = pci_conf_read16(seg, bus, PCI_SLOT(devfn),
+                            PCI_FUNC(devfn), pos + ATS_REG_CTL);
+    return value & ATS_ENABLE;
+}
+
+int pci_ats_device(int seg, int bus, int devfn)
+{
+    if ( !ats_enabled )
+        return 0;
+
+    if ( !pci_find_ext_capability(seg, bus, devfn, PCI_EXT_CAP_ID_ATS) )
+        return 0;
+
+    return 1;
+}
+
+struct pci_ats_dev* get_ats_device(int seg, int bus, int devfn)
+{
+    struct pci_ats_dev *pdev;
+
+    if ( !pci_ats_device(seg, bus, devfn) )
+        return NULL;
+
+    list_for_each_entry ( pdev, &ats_devices, list )
+    {
+        if ( pdev->seg == seg && pdev->bus == bus && pdev->devfn == devfn )
+            return pdev;
+    }
+
+    return NULL;
+}
diff -r 18088bd3e8f6 -r 3dc5e805d914 xen/drivers/passthrough/x86/ats.h
--- a/xen/drivers/passthrough/x86/ats.h Mon Oct 24 18:11:32 2011 +0200
+++ b/xen/drivers/passthrough/x86/ats.h Mon Oct 24 18:11:36 2011 +0200
@@ -34,5 +34,8 @@ extern bool_t ats_enabled;
 
 int enable_ats_device(int seg, int bus, int devfn);
 void disable_ats_device(int seg, int bus, int devfn);
+int pci_ats_enabled(int seg, int bus, int devfn);
+int pci_ats_device(int seg, int bus, int devfn);
+struct pci_ats_dev* get_ats_device(int seg, int bus, int devfn);
 
 #endif /* _X86_ATS_H_ */


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel