[xen staging] xen/common: move device initialization code to common code

[patchbot@xxxxxxx]

commit ed896312f2e4e238266830a0452a1af5fa7aecbc
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Tue Oct 15 14:22:00 2024 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Oct 15 14:22:00 2024 +0200

    xen/common: move device initialization code to common code
    
    Remove the device initialization code from `xen/arch/arm/device.c`
    and move it to the common code to avoid duplication and make it accessible
    for both ARM and other architectures.
    device_get_class(), device_init(), _sdevice[] and _edevice[] are wrapped by
    "#ifdef CONFIG_HAS_DEVICE_TREE" for the case if an arch doesn't support
    device tree.
    
    Remove unnecessary inclusions of <asm/device.h> and <xen/init.h> from
    `xen/arch/arm/device.c` as no code in the file relies on these headers.
    Fix the inclusion order by moving <asm/setup.h> after <xen/*> headers to
    resolve a compilation error:
       ./include/public/xen.h:968:35: error: unknown type name 'uint64_t'
        968 | __DEFINE_XEN_GUEST_HANDLE(uint64, uint64_t);
            |                                   ^~~~~~~~
       ./include/public/arch-arm.h:191:21: note: in definition of macro 
'___DEFINE_XEN_GUEST_HANDLE'
       191 |     typedef union { type *p; uint64_aligned_t q; }              \
           |                     ^~~~
       ./include/public/xen.h:968:1: note: in expansion of macro 
'__DEFINE_XEN_GUEST_HANDLE'
       968 | __DEFINE_XEN_GUEST_HANDLE(uint64, uint64_t);
    because <asm/setup.h> includes <public/version.h>, which in turn includes
    "xen.h", which requires <xen/types.h> to be processed correctly.
    Additionally, add <xen/device_tree.h> to `device.c` as functions from this
    header are used within the file.
    
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
---
 xen/arch/arm/device.c | 71 ++------------------------------------------
 xen/common/Makefile   |  2 ++
 xen/common/device.c   | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 86 insertions(+), 69 deletions(-)

diff --git a/xen/arch/arm/device.c b/xen/arch/arm/device.c
index 3e02cff008..5610cddcba 100644
--- a/xen/arch/arm/device.c
+++ b/xen/arch/arm/device.c
@@ -8,79 +8,12 @@
  * Copyright (C) 2013 Linaro Limited.
  */
 
-#include <asm/device.h>
-#include <asm/setup.h>
+#include <xen/device_tree.h>
 #include <xen/errno.h>
-#include <xen/init.h>
 #include <xen/iocap.h>
 #include <xen/lib.h>
 
-extern const struct device_desc _sdevice[], _edevice[];
-
-#ifdef CONFIG_ACPI
-extern const struct acpi_device_desc _asdevice[], _aedevice[];
-#endif
-
-int __init device_init(struct dt_device_node *dev, enum device_class class,
-                       const void *data)
-{
-    const struct device_desc *desc;
-
-    ASSERT(dev != NULL);
-
-    if ( !dt_device_is_available(dev) || dt_device_for_passthrough(dev) )
-        return  -ENODEV;
-
-    for ( desc = _sdevice; desc != _edevice; desc++ )
-    {
-        if ( desc->class != class )
-            continue;
-
-        if ( dt_match_node(desc->dt_match, dev) )
-        {
-            ASSERT(desc->init != NULL);
-
-            return desc->init(dev, data);
-        }
-
-    }
-
-    return -EBADF;
-}
-
-#ifdef CONFIG_ACPI
-int __init acpi_device_init(enum device_class class, const void *data, int 
class_type)
-{
-    const struct acpi_device_desc *desc;
-
-    for ( desc = _asdevice; desc != _aedevice; desc++ )
-    {
-        if ( ( desc->class != class ) || ( desc->class_type != class_type ) )
-            continue;
-
-        ASSERT(desc->init != NULL);
-
-        return desc->init(data);
-    }
-
-    return -EBADF;
-}
-#endif
-
-enum device_class device_get_class(const struct dt_device_node *dev)
-{
-    const struct device_desc *desc;
-
-    ASSERT(dev != NULL);
-
-    for ( desc = _sdevice; desc != _edevice; desc++ )
-    {
-        if ( dt_match_node(desc->dt_match, dev) )
-            return desc->class;
-    }
-
-    return DEVICE_UNKNOWN;
-}
+#include <asm/setup.h>
 
 int map_irq_to_domain(struct domain *d, unsigned int irq,
                       bool need_mapping, const char *devname)
diff --git a/xen/common/Makefile b/xen/common/Makefile
index f90bb00d23..fc48cbf688 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -6,6 +6,8 @@ obj-$(CONFIG_HYPFS_CONFIG) += config_data.o
 obj-$(CONFIG_CORE_PARKING) += core_parking.o
 obj-y += cpu.o
 obj-$(CONFIG_DEBUG_TRACE) += debugtrace.o
+obj-$(CONFIG_HAS_DEVICE_TREE) += device.o
+obj-$(filter-out $(CONFIG_X86),$(CONFIG_ACPI)) += device.o
 obj-$(CONFIG_HAS_DEVICE_TREE) += device-tree/
 obj-$(CONFIG_IOREQ_SERVER) += dm.o
 obj-y += domain.o
diff --git a/xen/common/device.c b/xen/common/device.c
new file mode 100644
index 0000000000..33e0d58f2f
--- /dev/null
+++ b/xen/common/device.c
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Based on the code from:
+ *   xen/arch/arm/device.c
+ */
+
+#include <xen/bug.h>
+#include <xen/device_tree.h>
+#include <xen/errno.h>
+#include <xen/init.h>
+
+#include <asm/device.h>
+
+#ifdef CONFIG_HAS_DEVICE_TREE
+
+extern const struct device_desc _sdevice[], _edevice[];
+
+int __init device_init(struct dt_device_node *dev, enum device_class class,
+                       const void *data)
+{
+    const struct device_desc *desc;
+
+    ASSERT(dev != NULL);
+
+    if ( !dt_device_is_available(dev) || dt_device_for_passthrough(dev) )
+        return  -ENODEV;
+
+    for ( desc = _sdevice; desc != _edevice; desc++ )
+    {
+        if ( desc->class != class )
+            continue;
+
+        if ( dt_match_node(desc->dt_match, dev) )
+        {
+            ASSERT(desc->init != NULL);
+
+            return desc->init(dev, data);
+        }
+    }
+
+    return -EBADF;
+}
+
+enum device_class device_get_class(const struct dt_device_node *dev)
+{
+    const struct device_desc *desc;
+
+    ASSERT(dev != NULL);
+
+    for ( desc = _sdevice; desc != _edevice; desc++ )
+    {
+        if ( dt_match_node(desc->dt_match, dev) )
+            return desc->class;
+    }
+
+    return DEVICE_UNKNOWN;
+}
+
+#endif
+
+#ifdef CONFIG_ACPI
+
+extern const struct acpi_device_desc _asdevice[], _aedevice[];
+
+int __init acpi_device_init(enum device_class class, const void *data, int 
class_type)
+{
+    const struct acpi_device_desc *desc;
+
+    for ( desc = _asdevice; desc != _aedevice; desc++ )
+    {
+        if ( ( desc->class != class ) || ( desc->class_type != class_type ) )
+            continue;
+
+        ASSERT(desc->init != NULL);
+
+        return desc->init(data);
+    }
+
+    return -EBADF;
+}
+
+#endif
--
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