Re: [PATCH v8 5/7] xen/asm-generic: introduce generic device.h

[Jan Beulich <jbeulich@xxxxxxxx>]

On 09.02.2024 19:00, Oleksii Kurochko wrote:
> --- /dev/null
> +++ b/xen/include/asm-generic/device.h
> @@ -0,0 +1,149 @@
> +/* 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(name_, namestr_, class_)            \

I don't think the trailing underscores are needed or helpful here
(or in the ACPI counterpart), ...

> +static const struct device_desc __dev_desc_##name_ __used   \
> +__section(".dev.info") = {                                  \
> +    .name = namestr_,                                       \
> +    .class = class_,

... seeing this all it would have taken was to avoid the two words
"name" and "class" (by e.g. using "ident" and "cls").

Nevertheless:
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>

Jan