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

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Date:   Tue, 31 Jan 2023 13:51:05 -0600
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Jeremi Piotrowski <jpiotrowski@...ux.microsoft.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 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.

> +	ret = sp_platform_init();
> +	if (ret) {
> +		sp_pci_exit();
> +		return ret;
> +	}

Add a blank line here.

>   #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.

> +	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/

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