x86/dpci: move hvm_dpci_isairq_eoi() to generic HVM code

The function hvm_dpci_isairq_eoi() has no dependencies on VT-d driver code
and can be moved from xen/drivers/passthrough/vtd/x86/hvm.c to
xen/drivers/passthrough/x86/hvm.c, along with the corresponding copyrights.

Remove the now empty xen/drivers/passthrough/vtd/x86/hvm.c.

Since the function is used only in this file, declare it static.

No functional change intended.

Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>

xen/drivers/passthrough/vtd/x86/Makefile

@@ -1,3 +1,2 @@
 obj-y += ats.o
-obj-$(CONFIG_HVM) += hvm.o
 obj-y += vtd.o

xen/drivers/passthrough/vtd/x86/hvm.c

@@ -1,64 +0,0 @@
-/*
- * Copyright (c) 2008, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; If not, see <http://www.gnu.org/licenses/>.
- *
- * Copyright (C) Allen Kay <allen.m.kay@intel.com>
- * Copyright (C) Weidong Han <weidong.han@intel.com>
- */
-
-#include <xen/iommu.h>
-#include <xen/irq.h>
-#include <xen/sched.h>
-
-static int cf_check _hvm_dpci_isairq_eoi(
-    struct domain *d, struct hvm_pirq_dpci *pirq_dpci, void *arg)
-{
-    struct hvm_irq *hvm_irq = hvm_domain_irq(d);
-    unsigned int isairq = (long)arg;
-    const struct dev_intx_gsi_link *digl;
-
-    list_for_each_entry ( digl, &pirq_dpci->digl_list, list )
-    {
-        unsigned int link = hvm_pci_intx_link(digl->device, digl->intx);
-
-        if ( hvm_irq->pci_link.route[link] == isairq )
-        {
-            hvm_pci_intx_deassert(d, digl->device, digl->intx);
-            if ( --pirq_dpci->pending == 0 )
-                pirq_guest_eoi(dpci_pirq(pirq_dpci));
-        }
-    }
-
-    return 0;
-}
-
-void hvm_dpci_isairq_eoi(struct domain *d, unsigned int isairq)
-{
-    struct hvm_irq_dpci *dpci = NULL;
-
-    ASSERT(isairq < NR_ISAIRQS);
-    if ( !is_iommu_enabled(d) )
-        return;
-
-    write_lock(&d->event_lock);
-
-    dpci = domain_get_irq_dpci(d);
-
-    if ( dpci && test_bit(isairq, dpci->isairq_map) )
-    {
-        /* Multiple mirq may be mapped to one isa irq */
-        pt_pirq_iterate(d, _hvm_dpci_isairq_eoi, (void *)(long)isairq);
-    }
-    write_unlock(&d->event_lock);
-}

xen/drivers/passthrough/x86/hvm.c

@@ -14,6 +14,7 @@
  * this program; If not, see <http://www.gnu.org/licenses/>.
  *
  * Copyright (C) Allen Kay <allen.m.kay@intel.com>
+ * Copyright (C) Weidong Han <weidong.han@intel.com>
  * Copyright (C) Xiaohui Xin <xiaohui.xin@intel.com>
  */
 
@@ -923,6 +924,50 @@ static void hvm_gsi_eoi(struct domain *d, unsigned int gsi)
     hvm_pirq_eoi(pirq);
 }
 
+static int cf_check _hvm_dpci_isairq_eoi(
+    struct domain *d, struct hvm_pirq_dpci *pirq_dpci, void *arg)
+{
+    const struct hvm_irq *hvm_irq = hvm_domain_irq(d);
+    unsigned int isairq = (long)arg;
+    const struct dev_intx_gsi_link *digl;
+
+    list_for_each_entry ( digl, &pirq_dpci->digl_list, list )
+    {
+        unsigned int link = hvm_pci_intx_link(digl->device, digl->intx);
+
+        if ( hvm_irq->pci_link.route[link] == isairq )
+        {
+            hvm_pci_intx_deassert(d, digl->device, digl->intx);
+            if ( --pirq_dpci->pending == 0 )
+                pirq_guest_eoi(dpci_pirq(pirq_dpci));
+        }
+    }
+
+    return 0;
+}
+
+static void hvm_dpci_isairq_eoi(struct domain *d, unsigned int isairq)
+{
+    const struct hvm_irq_dpci *dpci = NULL;
+
+    ASSERT(isairq < NR_ISAIRQS);
+
+    if ( !is_iommu_enabled(d) )
+        return;
+
+    write_lock(&d->event_lock);
+
+    dpci = domain_get_irq_dpci(d);
+
+    if ( dpci && test_bit(isairq, dpci->isairq_map) )
+    {
+        /* Multiple mirq may be mapped to one isa irq */
+        pt_pirq_iterate(d, _hvm_dpci_isairq_eoi, (void *)(long)isairq);
+    }
+
+    write_unlock(&d->event_lock);
+}
+
 void hvm_dpci_eoi(struct domain *d, unsigned int guest_gsi)
 {
     const struct hvm_irq_dpci *hvm_irq_dpci;

xen/include/xen/iommu.h

@@ -201,7 +201,6 @@ int hvm_do_IRQ_dpci(struct domain *, struct pirq *);
 int pt_irq_create_bind(struct domain *, const struct xen_domctl_bind_pt_irq *);
 int pt_irq_destroy_bind(struct domain *, const struct xen_domctl_bind_pt_irq *);
 
-void hvm_dpci_isairq_eoi(struct domain *d, unsigned int isairq);
 struct hvm_irq_dpci *domain_get_irq_dpci(const struct domain *);
 void free_hvm_irq_dpci(struct hvm_irq_dpci *dpci);