[xen master] xen/asm-generic: introduce generic device.h

[patchbot@xxxxxxx]

commit c2263735f57645a506608df0fc31509debd92ca8
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Tue Feb 20 12:21:38 2024 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Feb 20 12:21:38 2024 +0100

    xen/asm-generic: introduce generic device.h
    
    Arm, PPC and RISC-V introduce the same things in asm/device.h, so
    generic device.h was introduced.
    Arm's device.h was taken as a base with the following changes:
     - #ifdef ACPI related things.
     - Rename #ifdef guards.
     - Add SPDX tag.
     - #ifdef CONFIG_HAS_DEVICE_TREE related things.
     - #ifdef-ing iommu related things with CONFIG_HAS_PASSTHROUGH.
    
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/include/asm-generic/device.h | 145 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)

diff --git a/xen/include/asm-generic/device.h b/xen/include/asm-generic/device.h
new file mode 100644
index 0000000000..f91bb7f771
--- /dev/null
+++ b/xen/include/asm-generic/device.h
@@ -0,0 +1,145 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ASM_GENERIC_DEVICE_H__
+#define __ASM_GENERIC_DEVICE_H__
+
+#include <xen/stdbool.h>
+
+enum device_type
+{
+#ifdef CONFIG_HAS_DEVICE_TREE
+    DEV_DT,
+#endif
+    DEV_PCI
+};
+
+enum device_class
+{
+    DEVICE_SERIAL,
+    DEVICE_IOMMU,
+    DEVICE_INTERRUPT_CONTROLLER,
+    DEVICE_PCI_HOSTBRIDGE,
+    /* Use for error */
+    DEVICE_UNKNOWN,
+};
+
+struct dev_archdata {
+#ifdef CONFIG_HAS_PASSTHROUGH
+    void *iommu;    /* IOMMU private data */
+#endif
+};
+
+/* struct device - The basic device structure */
+struct device
+{
+    enum device_type type;
+#ifdef CONFIG_HAS_DEVICE_TREE
+    struct dt_device_node *of_node; /* Used by drivers imported from Linux */
+#endif
+    struct dev_archdata archdata;
+#ifdef CONFIG_HAS_PASSTHROUGH
+    struct iommu_fwspec *iommu_fwspec; /* per-device IOMMU instance data */
+#endif
+};
+
+typedef struct device device_t;
+
+#ifdef CONFIG_HAS_DEVICE_TREE
+
+#include <xen/device_tree.h>
+
+#define dev_is_dt(dev)  ((dev)->type == DEV_DT)
+
+/**
+ *  device_init - Initialize a device
+ *  @dev: device to initialize
+ *  @class: class of the device (serial, network...)
+ *  @data: specific data for initializing the device
+ *
+ *  Return 0 on success.
+ */
+int device_init(struct dt_device_node *dev, enum device_class class,
+                const void *data);
+
+/**
+ * device_get_type - Get the type of the device
+ * @dev: device to match
+ *
+ * Return the device type on success or DEVICE_ANY on failure
+ */
+enum device_class device_get_class(const struct dt_device_node *dev);
+
+#define DT_DEVICE_START(dev_name, ident, cls)                   \
+static const struct device_desc __dev_desc_##dev_name __used    \
+__section(".dev.info") = {                                      \
+    .name = ident,                                              \
+    .class = cls,
+
+#define DT_DEVICE_END                                           \
+};
+
+struct device_desc {
+    /* Device name */
+    const char *name;
+    /* Device class */
+    enum device_class class;
+
+    /* List of devices supported by this driver */
+    const struct dt_device_match *dt_match;
+    /*
+     * Device initialization.
+     *
+     * -EAGAIN is used to indicate that device probing is deferred.
+     */
+    int (*init)(struct dt_device_node *dev, const void *data);
+};
+
+#else /* !CONFIG_HAS_DEVICE_TREE */
+#define dev_is_dt(dev) ((void)(dev), false)
+#endif /* CONFIG_HAS_DEVICE_TREE */
+
+#define dev_is_pci(dev) ((dev)->type == DEV_PCI)
+
+#ifdef CONFIG_ACPI
+
+struct acpi_device_desc {
+    /* Device name */
+    const char *name;
+    /* Device class */
+    enum device_class class;
+    /* type of device supported by the driver */
+    const int class_type;
+    /* Device initialization */
+    int (*init)(const void *data);
+};
+
+/**
+ *  acpi_device_init - Initialize a device
+ *  @class: class of the device (serial, network...)
+ *  @data: specific data for initializing the device
+ *
+ *  Return 0 on success.
+ */
+int acpi_device_init(enum device_class class,
+                     const void *data, int class_type);
+
+#define ACPI_DEVICE_START(dev_name, ident, cls)                     \
+static const struct acpi_device_desc __dev_desc_##dev_name __used   \
+__section(".adev.info") = {                                         \
+    .name = ident,                                                  \
+    .class = cls,
+
+#define ACPI_DEVICE_END                                             \
+};
+
+#endif /* CONFIG_ACPI */
+
+#endif /* __ASM_GENERIC_DEVICE_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
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