Re: [Xen-devel] [RFC PATCH v3 06/18] xen/arm: ITS: Add helper functions to manage its_devices

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Vijay,

On 22/06/2015 13:01, vijay.kilari@xxxxxxxxx wrote:
> From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
>
> Helper functions to mange its devices using RB-tree
s/mange/manage/

> are introduced in physical ITS driver.
>
> This is global list of all the devices.
>
> Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
> ---
>   xen/arch/arm/gic-v3-its.c     |   49 +++++++++++++++++++++++++++++++++++++++++
>   xen/include/asm-arm/gic-its.h |    3 +++
>   2 files changed, 52 insertions(+)
>
> diff --git a/xen/arch/arm/gic-v3-its.c b/xen/arch/arm/gic-v3-its.c
> index b1a97c1..349d0bb 100644
> --- a/xen/arch/arm/gic-v3-its.c
> +++ b/xen/arch/arm/gic-v3-its.c
> @@ -92,6 +92,7 @@ struct its_node {
>   static LIST_HEAD(its_nodes);
>   static DEFINE_SPINLOCK(its_lock);
>   static struct rdist_prop  *gic_rdists;
> +static struct rb_root rb_its_dev;
>
>   #define gic_data_rdist()            (per_cpu(rdist, smp_processor_id()))
>   #define gic_data_rdist_rd_base()    (per_cpu(rdist, smp_processor_id()).rbase)
> @@ -145,6 +146,53 @@ void dump_cmd(its_cmd_block *cmd)
>   }
>   #endif
>
> +/* RB-tree helpers for its_device */
> +struct its_device * find_its_device(struct rb_root *root, u32 devid)
coding style: struct its_device *find


I would rename to its_find_device to keep consistent with the function 
name within this file.
Also, for any exported function you have to declare the prototype in the 
header within the same patch.
> +{
> +    struct rb_node *node = root->rb_node;
> +
> +    while ( node )
> +    {
> +        struct its_device *dev;
> +
> +        dev = container_of(node, struct its_device, node);
> +        if ( devid < dev->device_id )
> +            node = node->rb_left;
> +        else if ( devid > dev->device_id )
> +            node = node->rb_right;
> +        else
> +            return dev;
> +    }
> +
> +    return NULL;
> +}
> +
> +int insert_its_device(struct rb_root *root, struct its_device *dev)
Why do you need the root in parameter? You already it within the file.

Also, I would rename to its_add_device.

Regards,

--
Julien Grall

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