[PATCH RFC 02/10] passthrough: split out x86 PCI code to x86/pci.c

[Wei Liu <wei.liu2@citrix.com>]

Move the functions that reference x86 hvm data structures to its own
file.  Rename pci_clean_dpci_irqs to arch_pci_clean_irqs.

There is still one location in that file which references
arch.hvm_domain, but it is fine because ARM guest is HVM.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Julien Grall <julien.grall@arm.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>

ARM doesn't select HAS_PCI, that's why ARM build is not broken by
this. AIUI ARM will select HAS_PCI at some point, hence I only move
the x86 bits.
---
 xen/drivers/passthrough/pci.c        | 51 +----------------------------
 xen/drivers/passthrough/x86/Makefile |  1 +
 xen/drivers/passthrough/x86/pci.c    | 62 ++++++++++++++++++++++++++++++++++++
 xen/include/xen/pci.h                |  2 ++
 4 files changed, 66 insertions(+), 50 deletions(-)
 create mode 100644 xen/drivers/passthrough/x86/pci.c

diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c
index 2b976ade62..bf83d07279 100644
--- a/xen/drivers/passthrough/pci.c
+++ b/xen/drivers/passthrough/pci.c
@@ -22,7 +22,6 @@
 #include <xen/iommu.h>
 #include <xen/irq.h>
 #include <xen/vm_event.h>
-#include <asm/hvm/irq.h>
 #include <xen/delay.h>
 #include <xen/keyhandler.h>
 #include <xen/event.h>
@@ -798,54 +797,6 @@ int pci_remove_device(u16 seg, u8 bus, u8 devfn)
     return ret;
 }
 
-static int pci_clean_dpci_irq(struct domain *d,
-                              struct hvm_pirq_dpci *pirq_dpci, void *arg)
-{
-    struct dev_intx_gsi_link *digl, *tmp;
-
-    pirq_guest_unbind(d, dpci_pirq(pirq_dpci));
-
-    if ( pt_irq_need_timer(pirq_dpci->flags) )
-        kill_timer(&pirq_dpci->timer);
-
-    list_for_each_entry_safe ( digl, tmp, &pirq_dpci->digl_list, list )
-    {
-        list_del(&digl->list);
-        xfree(digl);
-    }
-
-    return pt_pirq_softirq_active(pirq_dpci) ? -ERESTART : 0;
-}
-
-static int pci_clean_dpci_irqs(struct domain *d)
-{
-    struct hvm_irq_dpci *hvm_irq_dpci = NULL;
-
-    if ( !iommu_enabled )
-        return 0;
-
-    if ( !is_hvm_domain(d) )
-        return 0;
-
-    spin_lock(&d->event_lock);
-    hvm_irq_dpci = domain_get_irq_dpci(d);
-    if ( hvm_irq_dpci != NULL )
-    {
-        int ret = pt_pirq_iterate(d, pci_clean_dpci_irq, NULL);
-
-        if ( ret )
-        {
-            spin_unlock(&d->event_lock);
-            return ret;
-        }
-
-        hvm_domain_irq(d)->dpci = NULL;
-        free_hvm_irq_dpci(hvm_irq_dpci);
-    }
-    spin_unlock(&d->event_lock);
-    return 0;
-}
-
 int pci_release_devices(struct domain *d)
 {
     struct pci_dev *pdev;
@@ -853,7 +804,7 @@ int pci_release_devices(struct domain *d)
     int ret;
 
     pcidevs_lock();
-    ret = pci_clean_dpci_irqs(d);
+    ret = arch_pci_clean_irqs(d);
     if ( ret )
     {
         pcidevs_unlock();
diff --git a/xen/drivers/passthrough/x86/Makefile b/xen/drivers/passthrough/x86/Makefile
index 06971707f8..0a21b60b5a 100644
--- a/xen/drivers/passthrough/x86/Makefile
+++ b/xen/drivers/passthrough/x86/Makefile
@@ -4,3 +4,4 @@ subdir-y += amd
 obj-y += ats.o
 obj-y += io.o
 obj-y += iommu.o
+obj-y += pci.o
diff --git a/xen/drivers/passthrough/x86/pci.c b/xen/drivers/passthrough/x86/pci.c
new file mode 100644
index 0000000000..e0a7e473b1
--- /dev/null
+++ b/xen/drivers/passthrough/x86/pci.c
@@ -0,0 +1,62 @@
+#include <xen/irq.h>
+#include <xen/iommu.h>
+#include <xen/sched.h>
+
+#include <asm/hvm/irq.h>
+
+static int pci_clean_dpci_irq(struct domain *d,
+                              struct hvm_pirq_dpci *pirq_dpci, void *arg)
+{
+    struct dev_intx_gsi_link *digl, *tmp;
+
+    pirq_guest_unbind(d, dpci_pirq(pirq_dpci));
+
+    if ( pt_irq_need_timer(pirq_dpci->flags) )
+        kill_timer(&pirq_dpci->timer);
+
+    list_for_each_entry_safe ( digl, tmp, &pirq_dpci->digl_list, list )
+    {
+        list_del(&digl->list);
+        xfree(digl);
+    }
+
+    return pt_pirq_softirq_active(pirq_dpci) ? -ERESTART : 0;
+}
+
+int arch_pci_clean_irqs(struct domain *d)
+{
+    struct hvm_irq_dpci *hvm_irq_dpci = NULL;
+
+    if ( !iommu_enabled )
+        return 0;
+
+    if ( !is_hvm_domain(d) )
+        return 0;
+
+    spin_lock(&d->event_lock);
+    hvm_irq_dpci = domain_get_irq_dpci(d);
+    if ( hvm_irq_dpci != NULL )
+    {
+        int ret = pt_pirq_iterate(d, pci_clean_dpci_irq, NULL);
+
+        if ( ret )
+        {
+            spin_unlock(&d->event_lock);
+            return ret;
+        }
+
+        hvm_domain_irq(d)->dpci = NULL;
+        free_hvm_irq_dpci(hvm_irq_dpci);
+    }
+    spin_unlock(&d->event_lock);
+    return 0;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/xen/pci.h b/xen/include/xen/pci.h
index dd5ec43a70..2d3bdf386f 100644
--- a/xen/include/xen/pci.h
+++ b/xen/include/xen/pci.h
@@ -153,6 +153,8 @@ struct pci_dev *pci_get_pdev_by_domain(const struct domain *, int seg,
                                        int bus, int devfn);
 void pci_check_disable_device(u16 seg, u8 bus, u8 devfn);
 
+int arch_pci_clean_irqs(struct domain *d);
+
 uint8_t pci_conf_read8(
     unsigned int seg, unsigned int bus, unsigned int dev, unsigned int func,
     unsigned int reg);
-- 
2.11.0


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