Re: [PATCH] xen/include: introduce resource.h

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Fri, 7 Feb 2025, dmkhn@xxxxxxxxx wrote:
> Move resource definitions to a new architecture-agnostic shared header file.
> 
> Signed-off-by: Denis Mukhin <dmukhin@xxxxxxxx>

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> ---
> Link to the original patch:
>   
> https://lore.kernel.org/xen-devel/20250103-vuart-ns8250-v3-v1-18-c5d36b31d66c@xxxxxxxx/
> ---
> ---
>  xen/common/device-tree/device-tree.c | 21 +----------------
>  xen/drivers/passthrough/arm/smmu.c   | 15 +-----------
>  xen/include/xen/resource.h           | 34 ++++++++++++++++++++++++++++
>  3 files changed, 36 insertions(+), 34 deletions(-)
>  create mode 100644 xen/include/xen/resource.h
> 
> diff --git a/xen/common/device-tree/device-tree.c 
> b/xen/common/device-tree/device-tree.c
> index d0528c5825..e8f810b2fe 100644
> --- a/xen/common/device-tree/device-tree.c
> +++ b/xen/common/device-tree/device-tree.c
> @@ -24,6 +24,7 @@
>  #include <xen/ctype.h>
>  #include <asm/setup.h>
>  #include <xen/err.h>
> +#include <xen/resource.h>
>  
>  const void *device_tree_flattened;
>  dt_irq_xlate_func dt_irq_xlate;
> @@ -535,26 +536,6 @@ int dt_child_n_size_cells(const struct dt_device_node 
> *parent)
>      return __dt_n_size_cells(parent, true);
>  }
>  
> -/*
> - * These are defined in Linux where much of this code comes from, but
> - * are currently unused outside this file in the context of Xen.
> - */
> -#define IORESOURCE_BITS         0x000000ff      /* Bus-specific bits */
> -
> -#define IORESOURCE_TYPE_BITS    0x00001f00      /* Resource type */
> -#define IORESOURCE_IO           0x00000100      /* PCI/ISA I/O ports */
> -#define IORESOURCE_MEM          0x00000200
> -#define IORESOURCE_REG          0x00000300      /* Register offsets */
> -#define IORESOURCE_IRQ          0x00000400
> -#define IORESOURCE_DMA          0x00000800
> -#define IORESOURCE_BUS          0x00001000
> -
> -#define IORESOURCE_PREFETCH     0x00002000      /* No side effects */
> -#define IORESOURCE_READONLY     0x00004000
> -#define IORESOURCE_CACHEABLE    0x00008000
> -#define IORESOURCE_RANGELENGTH  0x00010000
> -#define IORESOURCE_SHADOWABLE   0x00020000
> -
>  /*
>   * Default translator (generic bus)
>   */
> diff --git a/xen/drivers/passthrough/arm/smmu.c 
> b/xen/drivers/passthrough/arm/smmu.c
> index 03d22bce1e..aa6a968b57 100644
> --- a/xen/drivers/passthrough/arm/smmu.c
> +++ b/xen/drivers/passthrough/arm/smmu.c
> @@ -50,6 +50,7 @@
>  #include <xen/rbtree.h>
>  #include <xen/sched.h>
>  #include <xen/sizes.h>
> +#include <xen/resource.h>
>  #include <asm/atomic.h>
>  #include <asm/device.h>
>  #include <asm/io.h>
> @@ -70,22 +71,8 @@
>  #define of_property_read_u32(np, pname, out) (!dt_property_read_u32(np, 
> pname, out))
>  #define of_property_read_bool dt_property_read_bool
>  #define of_parse_phandle_with_args dt_parse_phandle_with_args
> -
> -/* Xen: Helpers to get device MMIO and IRQs */
> -struct resource
> -{
> -     paddr_t addr;
> -     paddr_t size;
> -     unsigned int type;
> -};
> -
> -#define resource_size(res) (res)->size;
> -
>  #define platform_device dt_device_node
>  
> -#define IORESOURCE_MEM 0
> -#define IORESOURCE_IRQ 1
> -
>  static struct resource *platform_get_resource(struct platform_device *pdev,
>                                             unsigned int type,
>                                             unsigned int num)
> diff --git a/xen/include/xen/resource.h b/xen/include/xen/resource.h
> new file mode 100644
> index 0000000000..5d10363128
> --- /dev/null
> +++ b/xen/include/xen/resource.h
> @@ -0,0 +1,34 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * System resource description.
> + */
> +#ifndef XEN__RESOURCE_H
> +#define XEN__RESOURCE_H
> +
> +#define IORESOURCE_BITS         0x000000FFU      /* Bus-specific bits */
> +
> +#define IORESOURCE_TYPE_BITS    0x00001F00U      /* Resource type */
> +#define IORESOURCE_IO           0x00000100U      /* PCI/ISA I/O ports */
> +#define IORESOURCE_MEM          0x00000200U
> +#define IORESOURCE_REG          0x00000300U      /* Register offsets */
> +#define IORESOURCE_IRQ          0x00000400U
> +#define IORESOURCE_DMA          0x00000800U
> +#define IORESOURCE_BUS          0x00001000U
> +
> +#define IORESOURCE_PREFETCH     0x00002000U      /* No side effects */
> +#define IORESOURCE_READONLY     0x00004000U
> +#define IORESOURCE_CACHEABLE    0x00008000U
> +#define IORESOURCE_RANGELENGTH  0x00010000U
> +#define IORESOURCE_SHADOWABLE   0x00020000U
> +
> +#define IORESOURCE_UNKNOWN      (~0U)
> +
> +struct resource {
> +    paddr_t addr;
> +    paddr_t size;
> +    unsigned int type;
> +};
> +
> +#define resource_size(res)      ((res)->size)
> +
> +#endif /* XEN__RESOURCE_H */
> -- 
> 2.34.1
> 
>