linux-kernel - [PATCH v2 5/8] crypto: cpp - Bind to psp platform device on x86

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Message-Id: <20230213092429.1167812-6-jpiotrowski@linux.microsoft.com>
Date:   Mon, 13 Feb 2023 09:24:26 +0000
From:   Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>,
        "Brijesh Singh" <brijesh.singh@....com>,
        "Tom Lendacky" <thomas.lendacky@....com>,
        "Kalra, Ashish" <ashish.kalra@....com>,
        linux-crypto@...r.kernel.org
Subject: [PATCH v2 5/8] crypto: cpp - Bind to psp platform device on x86

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      | 7 +++++++
 drivers/crypto/ccp/sp-platform.c | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/crypto/ccp/sp-dev.c b/drivers/crypto/ccp/sp-dev.c
index 7eb3e4668286..4c9f442b8a11 100644
--- a/drivers/crypto/ccp/sp-dev.c
+++ b/drivers/crypto/ccp/sp-dev.c
@@ -259,6 +259,12 @@ static int __init sp_mod_init(void)
 	if (ret)
 		return ret;
 
+	ret = sp_platform_init();
+	if (ret) {
+		sp_pci_exit();
+		return ret;
+	}
+
 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
 	psp_pci_init();
 #endif
@@ -286,6 +292,7 @@ static void __exit sp_mod_exit(void)
 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
 	psp_pci_exit();
 #endif
+	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..5dcc834deb72 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_platform_match[] = {
+	{ "psp" },
+	{ },
+};
+MODULE_DEVICE_TABLE(platform, sp_platform_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_platform_match,
 	.driver = {
 		.name = "ccp",
 #ifdef CONFIG_ACPI
-- 
2.25.1