linux-kernel - [PATCH 4/5] crypto: ccp: Add a macro to check capabilities register

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Message-ID: <20230907184846.47598-5-mario.limonciello@amd.com>
Date:   Thu, 7 Sep 2023 13:48:45 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>
CC:     <thomas.lendacky@....com>, <john.allen@....com>,
        <linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <Rijo-john.Thomas@....com>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH 4/5] crypto: ccp: Add a macro to check capabilities register

Offsets are checked by the capabilities register in multiple places.
To make the code more readable add a macro.

Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/crypto/ccp/psp-dev.c | 6 +++---
 drivers/crypto/ccp/sp-dev.h  | 1 +
 drivers/crypto/ccp/sp-pci.c  | 4 ++--
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index f9f3b3404f87..5f61b23695d5 100644
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -157,7 +157,7 @@ static unsigned int psp_get_capability(struct psp_device *psp)
 	psp->capability = val;
 
 	/* Detect if TSME and SME are both enabled */
-	if (psp->capability & PSP_CAPABILITY_PSP_SECURITY_REPORTING &&
+	if (PSP_CAPABILITY(psp, PSP_SECURITY_REPORTING) &&
 	    psp->capability & (PSP_SECURITY_TSME_STATUS << PSP_CAPABILITY_PSP_SECURITY_OFFSET) &&
 	    cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT))
 		dev_notice(psp->dev, "psp: Both TSME and SME are active, SME is unnecessary when TSME is active.\n");
@@ -168,7 +168,7 @@ static unsigned int psp_get_capability(struct psp_device *psp)
 static int psp_check_sev_support(struct psp_device *psp)
 {
 	/* Check if device supports SEV feature */
-	if (!(psp->capability & PSP_CAPABILITY_SEV)) {
+	if (!PSP_CAPABILITY(psp, SEV)) {
 		dev_dbg(psp->dev, "psp does not support SEV\n");
 		return -ENODEV;
 	}
@@ -179,7 +179,7 @@ static int psp_check_sev_support(struct psp_device *psp)
 static int psp_check_tee_support(struct psp_device *psp)
 {
 	/* Check if device supports TEE feature */
-	if (!(psp->capability & PSP_CAPABILITY_TEE)) {
+	if (!PSP_CAPABILITY(psp, TEE)) {
 		dev_dbg(psp->dev, "psp does not support TEE\n");
 		return -ENODEV;
 	}
diff --git a/drivers/crypto/ccp/sp-dev.h b/drivers/crypto/ccp/sp-dev.h
index c4e125efe6c7..03d5b9e04084 100644
--- a/drivers/crypto/ccp/sp-dev.h
+++ b/drivers/crypto/ccp/sp-dev.h
@@ -30,6 +30,7 @@
 
 #define PLATFORM_FEATURE_DBC		0x1
 
+#define PSP_CAPABILITY(psp, cap) (psp->capability & PSP_CAPABILITY_##cap)
 #define PSP_FEATURE(psp, feat)	(psp->vdata && psp->vdata->platform_features & PLATFORM_FEATURE_##feat)
 
 /* Structure to hold CCP device data */
diff --git a/drivers/crypto/ccp/sp-pci.c b/drivers/crypto/ccp/sp-pci.c
index d1aedc5c1a68..300dda14182b 100644
--- a/drivers/crypto/ccp/sp-pci.c
+++ b/drivers/crypto/ccp/sp-pci.c
@@ -84,7 +84,7 @@ static umode_t psp_security_is_visible(struct kobject *kobj, struct attribute *a
 	struct sp_device *sp = dev_get_drvdata(dev);
 	struct psp_device *psp = sp->psp_data;
 
-	if (psp && (psp->capability & PSP_CAPABILITY_PSP_SECURITY_REPORTING))
+	if (psp && PSP_CAPABILITY(psp, PSP_SECURITY_REPORTING))
 		return 0444;
 
 	return 0;
@@ -135,7 +135,7 @@ static umode_t psp_firmware_is_visible(struct kobject *kobj, struct attribute *a
 		val = ioread32(psp->io_regs + psp->vdata->bootloader_info_reg);
 
 	if (attr == &dev_attr_tee_version.attr &&
-	    psp->capability & PSP_CAPABILITY_TEE &&
+	    PSP_CAPABILITY(psp, TEE) &&
 	    psp->vdata->tee->info_reg)
 		val = ioread32(psp->io_regs + psp->vdata->tee->info_reg);
 
-- 
2.34.1