Re: [Xen-devel] [RFC 2/6] arm64: Add definitions for fwnode_handle

["Goel, Sameer" <sgoel@xxxxxxxxxxxxxx>]

On 6/8/2017 1:59 PM, Julien Grall wrote:
> 
> 
> On 08/06/2017 20:30, Sameer Goel wrote:
>> This will be used as a device property to match the DMA capable devices
>> with the associated SMMU. The header file is a port from linux.
>>
>> Linux ChangeId:ce793486e23e: driver core / ACPI: Represent ACPI
>> companions using fwnode_handle
>>
>> Signed-off-by: Sameer Goel <sgoel@xxxxxxxxxxxxxx>
>> ---
>>  xen/include/asm-arm/device.h |  2 ++
>>  xen/include/xen/fwnode.h     | 35 +++++++++++++++++++++++++++++++++++
>>  2 files changed, 37 insertions(+)
>>  create mode 100644 xen/include/xen/fwnode.h
>>
>> diff --git a/xen/include/asm-arm/device.h b/xen/include/asm-arm/device.h
>> index 6734ae8..78c38fe 100644
>> --- a/xen/include/asm-arm/device.h
>> +++ b/xen/include/asm-arm/device.h
>> @@ -2,6 +2,7 @@
>>  #define __ASM_ARM_DEVICE_H
>>
>>  #include <xen/init.h>
>> +#include <xen/fwnode.h>
>>
>>  enum device_type
>>  {
>> @@ -19,6 +20,7 @@ struct device
>>  #ifdef CONFIG_HAS_DEVICE_TREE
>>      struct dt_device_node *of_node; /* Used by drivers imported from Linux 
>> */
>>  #endif
>> +    struct fwnode_handle *fwnode; /*fw device node identifier */
> 
> I am a bit surprised you don't rework struct dev. As of_node is now redundant 
> with fwnode.

I agree that this will eventually be removed. I have kept this in now just to 
maintain compatibility
(compilation and otherwise) with smmuv2 driver. I will add a comment to 
indicate this. So that it can 
be easily identified and remove when we do a final cleanup. Can I prefix the 
comment with with XEN:TODO:? 

> 
>>      struct dev_archdata archdata;
>>  };
>>
>> diff --git a/xen/include/xen/fwnode.h b/xen/include/xen/fwnode.h
>> new file mode 100644
>> index 0000000..db65b15
>> --- /dev/null
>> +++ b/xen/include/xen/fwnode.h
>> @@ -0,0 +1,35 @@
>> +/*
>> + * fwnode.h - Firmware device node object handle type definition.
>> + *
>> + * Copyright (C) 2015, Intel Corporation
>> + * Author: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + *
>> + * Ported from Linux include/linux/fwnode.h
>> + *  => commit ce793486e23e0162a732c605189c8028e0910e86
>> + *
>> + * No functional Xen modifications.
>> + */
>> +
>> +#ifndef __XEN_FWNODE_H_
>> +#define __XEN_FWNODE_H_
>> +
>> +enum fwnode_type {
>> +    FWNODE_INVALID = 0,
>> +    FWNODE_OF,
>> +    FWNODE_ACPI,
>> +    FWNODE_ACPI_DATA,
>> +    FWNODE_ACPI_STATIC,
>> +    FWNODE_PDATA,
>> +    FWNODE_IRQCHIP
> 
> Do you really need to introduce all of them?
> 
Not really. We are interested in OF and ACPI_STATIC for now. Since the verbatim 
file from Linux applied ok, I did not remove the other entries.
What's your recommendation?

>> +};
>> +
>> +struct fwnode_handle {
>> +    enum fwnode_type type;
>> +    struct fwnode_handle *secondary;
>> +};
>> +
>> +#endif
>>
> 
> Cheers,
> 

Thanks,
Sameer
-- 
 Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, 
Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux 
Foundation Collaborative Project.

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