netdev - Re: [PATCH v2 03/15] cxl: add function for type2 resource request

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Message-ID: <6f9dc18e-6f47-e276-2388-68e1d4dc581b@amd.com>
Date: Wed, 14 Aug 2024 09:00:13 +0100
From: Alejandro Lucero Palau <alucerop@....com>
To: Dave Jiang <dave.jiang@...el.com>, alejandro.lucero-palau@....com,
 linux-cxl@...r.kernel.org, netdev@...r.kernel.org, dan.j.williams@...el.com,
 martin.habets@...inx.com, edward.cree@....com, davem@...emloft.net,
 kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
 richard.hughes@....com
Subject: Re: [PATCH v2 03/15] cxl: add function for type2 resource request


On 7/19/24 00:36, Dave Jiang wrote:
>
> On 7/15/24 10:28 AM, alejandro.lucero-palau@....com wrote:
>> From: Alejandro Lucero <alucerop@....com>
>>
>> Create a new function for a type2 device requesting a resource
>> passing the opaque struct to work with.
>>
>> Signed-off-by: Alejandro Lucero <alucerop@....com>
>> ---
>>   drivers/cxl/core/memdev.c          | 13 +++++++++++++
>>   drivers/net/ethernet/sfc/efx_cxl.c |  7 ++++++-
>>   include/linux/cxl_accel_mem.h      |  1 +
>>   3 files changed, 20 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
>> index 61b5d35b49e7..04c3a0f8bc2e 100644
>> --- a/drivers/cxl/core/memdev.c
>> +++ b/drivers/cxl/core/memdev.c
>> @@ -744,6 +744,19 @@ void cxl_accel_set_resource(struct cxl_dev_state *cxlds, struct resource res,
>>   }
>>   EXPORT_SYMBOL_NS_GPL(cxl_accel_set_resource, CXL);
>>   
>> +int cxl_accel_request_resource(struct cxl_dev_state *cxlds, bool is_ram)
> Maybe declare a common enum like cxl_resource_type instead of 'enum accel_resource' and use here instead of bool?


Yes. Thanks

>> +{
>> +	int rc;
>> +
>> +	if (is_ram)
>> +		rc = request_resource(&cxlds->dpa_res, &cxlds->ram_res);
>> +	else
>> +		rc = request_resource(&cxlds->dpa_res, &cxlds->pmem_res);
>> +
>> +	return rc;
>> +}
>> +EXPORT_SYMBOL_NS_GPL(cxl_accel_request_resource, CXL);
>> +
>>   static int cxl_memdev_release_file(struct inode *inode, struct file *file)
>>   {
>>   	struct cxl_memdev *cxlmd =
>> diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
>> index 10c4fb915278..9cefcaf3caca 100644
>> --- a/drivers/net/ethernet/sfc/efx_cxl.c
>> +++ b/drivers/net/ethernet/sfc/efx_cxl.c
>> @@ -48,8 +48,13 @@ void efx_cxl_init(struct efx_nic *efx)
>>   	res = DEFINE_RES_MEM_NAMED(0, EFX_CTPIO_BUFFER_SIZE, "ram");
>>   	cxl_accel_set_resource(cxl->cxlds, res, CXL_ACCEL_RES_RAM);
>>   
>> -	if (cxl_pci_accel_setup_regs(pci_dev, cxl->cxlds))
>> +	if (cxl_pci_accel_setup_regs(pci_dev, cxl->cxlds)) {
>>   		pci_info(pci_dev, "CXL accel setup regs failed");
>> +		return;
>> +	}
>> +
>> +	if (cxl_accel_request_resource(cxl->cxlds, true))
>> +		pci_info(pci_dev, "CXL accel resource request failed");
> pci_warn()? also emitting the errno would be nice.
>
>>   }
>>   
>>   
>> diff --git a/include/linux/cxl_accel_mem.h b/include/linux/cxl_accel_mem.h
>> index ca7af4a9cefc..c7b254edc096 100644
>> --- a/include/linux/cxl_accel_mem.h
>> +++ b/include/linux/cxl_accel_mem.h
>> @@ -20,4 +20,5 @@ void cxl_accel_set_serial(cxl_accel_state *cxlds, u64 serial);
>>   void cxl_accel_set_resource(struct cxl_dev_state *cxlds, struct resource res,
>>   			    enum accel_resource);
>>   int cxl_pci_accel_setup_regs(struct pci_dev *pdev, struct cxl_dev_state *cxlds);
>> +int cxl_accel_request_resource(struct cxl_dev_state *cxlds, bool is_ram);
>>   #endif