netdev - Re: [PATCH v14 13/22] cxl: define a driver interface for DPA allocation

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Message-ID: <727ecbec-1f5b-4397-bfda-9a3a4b891ddb@amd.com>
Date: Fri, 9 May 2025 08:40:19 +0100
From: Alejandro Lucero Palau <alucerop@....com>
To: Alison Schofield <alison.schofield@...el.com>,
 alejandro.lucero-palau@....com
Cc: linux-cxl@...r.kernel.org, netdev@...r.kernel.org,
 dan.j.williams@...el.com, edward.cree@....com, davem@...emloft.net,
 kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
 dave.jiang@...el.com, Ben Cheatham <benjamin.cheatham@....com>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v14 13/22] cxl: define a driver interface for DPA
 allocation


On 5/8/25 19:02, Alison Schofield wrote:
> On Thu, Apr 17, 2025 at 10:29:16PM +0100, alejandro.lucero-palau@....com wrote:
>> From: Alejandro Lucero <alucerop@....com>
>>
>> Region creation involves finding available DPA (device-physical-address)
>> capacity to map into HPA (host-physical-address) space. Define an API,
>> cxl_request_dpa(), that tries to allocate the DPA memory the driver
>> requires to operate. The memory requested should not be bigger than the
>> max available HPA obtained previously with cxl_get_hpa_freespace.
>>
>> Based on https://lore.kernel.org/linux-cxl/168592158743.1948938.7622563891193802610.stgit@dwillia2-xfh.jf.intel.com/
>>
>> Signed-off-by: Alejandro Lucero <alucerop@....com>
>> Reviewed-by: Ben Cheatham <benjamin.cheatham@....com>
>> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>> ---
>>   drivers/cxl/core/hdm.c | 77 ++++++++++++++++++++++++++++++++++++++++++
>>   include/cxl/cxl.h      |  5 +++
>>   2 files changed, 82 insertions(+)
> snip
>
>> diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h
>> index e9ae7eff2393..c75456dd7404 100644
>> --- a/include/cxl/cxl.h
>> +++ b/include/cxl/cxl.h
>> @@ -8,6 +8,7 @@
>>   #include <linux/cdev.h>
>>   #include <linux/node.h>
>>   #include <linux/ioport.h>
>> +#include <linux/range.h>
>>   #include <cxl/mailbox.h>
> range.h is not needed here in this patch, nor for the set as whole.
> It builds without.


It mostly build without it. It was added for fixing robot complains for 
different arch builds as in here:


https://lore.kernel.org/linux-cxl/20250414151336.3852990-1-alejandro.lucero-palau@amd.com/T/#m8f5ad2153bc40fcc1213a2b062f57a4e336f5a7f