File 18937-S3-MSI.patch of Package xen

# HG changeset patch
# User Keir Fraser <keir.fraser@citrix.com>
# Date 1229698596 0
# Node ID 2dffa6ceb0af954e7f3a9ad7e993b8aee7b7de65
# Parent  738513b106fa262a11cc3254cd6dd67afb3a63e7
Support S3 for MSI interrupt

From: "Jiang, Yunhong" <yunhong.jiang@intel.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

--- a/xen/arch/x86/msi.c
+++ b/xen/arch/x86/msi.c
@@ -771,3 +771,41 @@ void pci_cleanup_msi(struct pci_dev *pde
     msi_free_vectors(pdev);
 }
 
+int pci_restore_msi_state(struct pci_dev *pdev)
+{
+    unsigned long flags;
+    int vector;
+    struct msi_desc *entry, *tmp;
+    irq_desc_t *desc;
+
+    if (!pdev)
+        return -EINVAL;
+
+    list_for_each_entry_safe( entry, tmp, &pdev->msi_list, list )
+    {
+        vector = entry->vector;
+        desc = &irq_desc[vector];
+
+        spin_lock_irqsave(&desc->lock, flags);
+
+        ASSERT(desc->msi_desc == entry);
+
+        if (desc->msi_desc != entry)
+        {
+            dprintk(XENLOG_ERR, "Restore MSI for dev %x:%x not set before?\n",
+                                pdev->bus, pdev->devfn);
+            spin_unlock_irqrestore(&desc->lock, flags);
+            return -EINVAL;
+        }
+
+        msi_set_enable(pdev, 0);
+        write_msi_msg(entry, &entry->msg);
+
+        msi_set_enable(pdev, 1);
+        msi_set_mask_bit(vector, entry->msi_attrib.masked);
+        spin_unlock_irqrestore(&desc->lock, flags);
+    }
+
+    return 0;
+}
+
--- a/xen/arch/x86/physdev.c
+++ b/xen/arch/x86/physdev.c
@@ -427,6 +427,27 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_H
         break;
     }
 
+    case PHYSDEVOP_restore_msi: {
+        struct physdev_restore_msi restore_msi;
+        struct pci_dev *pdev;
+
+        ret = -EPERM;
+        if ( !IS_PRIV(v->domain) )
+            break;
+
+        ret = -EFAULT;
+        if ( copy_from_guest(&restore_msi, arg, 1) != 0 )
+            break;
+
+        pdev = pci_lock_pdev(restore_msi.bus, restore_msi.devfn);
+        ret = -ENODEV;
+        if ( !pdev )
+            break;
+
+        ret = pci_restore_msi_state(pdev);
+        spin_unlock(&pdev->lock);
+        break;
+    }
     default:
         ret = -ENOSYS;
         break;
--- a/xen/include/asm-x86/msi.h
+++ b/xen/include/asm-x86/msi.h
@@ -75,6 +75,7 @@ extern void set_msi_irq_affinity(unsigne
 extern int pci_enable_msi(struct msi_info *msi);
 extern void pci_disable_msi(int vector);
 extern void pci_cleanup_msi(struct pci_dev *pdev);
+extern int pci_restore_msi_state(struct pci_dev *pdev);
 
 struct msi_desc {
 	struct {
--- a/xen/include/public/physdev.h
+++ b/xen/include/public/physdev.h
@@ -183,6 +183,15 @@ struct physdev_manage_pci {
 typedef struct physdev_manage_pci physdev_manage_pci_t;
 DEFINE_XEN_GUEST_HANDLE(physdev_manage_pci_t);
 
+#define PHYSDEVOP_restore_msi            19
+struct physdev_restore_msi {
+    /* IN */
+    uint8_t bus;
+    uint8_t devfn;
+};
+typedef struct physdev_restore_msi physdev_restore_msi_t;
+DEFINE_XEN_GUEST_HANDLE(physdev_restore_msi_t);
+
 /*
  * Argument to physdev_op_compat() hypercall. Superceded by new physdev_op()
  * hypercall since 0x00030202.