linux-kernel - Re: [PATCH v1 5/8] crypto: cpp - Bind to psp platform device on x86

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Date:   Wed, 8 Feb 2023 13:48:58 +0100
From:   Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>
To:     Tom Lendacky <thomas.lendacky@....com>,
        linux-kernel@...r.kernel.org
Cc:     Brijesh Singh <brijesh.singh@....com>,
        "Kalra, Ashish" <ashish.kalra@....com>,
        linux-crypto@...r.kernel.org
Subject: Re: [PATCH v1 5/8] crypto: cpp - Bind to psp platform device on x86

On 31/01/2023 20:51, Tom Lendacky wrote:
> On 1/23/23 09:22, Jeremi Piotrowski wrote:
>> The PSP in Hyper-V VMs is exposed through the ASP ACPI table and is
>> represented as a platform_device. Allow the ccp driver to bind to it by
>> adding an id_table and initing the platform_driver also on x86. At this
>> point probe is called for the psp device but init fails due to missing
>> driver data.
>>
>> Signed-off-by: Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>
>> ---
>>   drivers/crypto/ccp/sp-dev.c      | 8 ++++++--
>>   drivers/crypto/ccp/sp-platform.c | 7 +++++++
>>   2 files changed, 13 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/crypto/ccp/sp-dev.c b/drivers/crypto/ccp/sp-dev.c
>> index 7eb3e4668286..52b8d957d0f6 100644
>> --- a/drivers/crypto/ccp/sp-dev.c
>> +++ b/drivers/crypto/ccp/sp-dev.c
>> @@ -258,7 +258,11 @@ static int __init sp_mod_init(void)
>>       ret = sp_pci_init();
>>       if (ret)
>>           return ret;
>> -
> Please keep the blank line here.>

ok
 
>> +    ret = sp_platform_init();
>> +    if (ret) {
>> +        sp_pci_exit();
>> +        return ret;
>> +    }
> 
> Add a blank line here.
>

ok

>>   #ifdef CONFIG_CRYPTO_DEV_SP_PSP
>>       psp_pci_init();
>>   #endif
>> @@ -286,7 +290,7 @@ static void __exit sp_mod_exit(void)
>>   #ifdef CONFIG_CRYPTO_DEV_SP_PSP
>>       psp_pci_exit();
>>   #endif
>> -
> 
> Please keep the blank line here.
>

ok

>> +    sp_platform_exit(); >       sp_pci_exit();
>>   #endif
>>   diff --git a/drivers/crypto/ccp/sp-platform.c b/drivers/crypto/ccp/sp-platform.c
>> index 7d79a8744f9a..ea8926e87981 100644
>> --- a/drivers/crypto/ccp/sp-platform.c
>> +++ b/drivers/crypto/ccp/sp-platform.c
>> @@ -56,6 +56,12 @@ static const struct of_device_id sp_of_match[] = {
>>   MODULE_DEVICE_TABLE(of, sp_of_match);
>>   #endif
>>   +static const struct platform_device_id sp_plat_match[] = {
> 
> s/plat/platform/
> 

ok

> Thanks,
> Tom
> 
>> +    { "psp" },
>> +    { },
>> +};
>> +MODULE_DEVICE_TABLE(platform, sp_plat_match);
>> +
>>   static struct sp_dev_vdata *sp_get_of_version(struct platform_device *pdev)
>>   {
>>   #ifdef CONFIG_OF
>> @@ -212,6 +218,7 @@ static int sp_platform_resume(struct platform_device *pdev)
>>   #endif
>>     static struct platform_driver sp_platform_driver = {
>> +    .id_table = sp_plat_match,
>>       .driver = {
>>           .name = "ccp",
>>   #ifdef CONFIG_ACPI