linux-kernel - [RFC PATCH 03/21] iommu/amd: Update PASID, GATS, and GLX feature related macros

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Message-ID: <20230621235508.113949-4-suravee.suthikulpanit@amd.com>
Date:   Wed, 21 Jun 2023 18:54:50 -0500
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
        <kvm@...r.kernel.org>
CC:     <joro@...tes.org>, <robin.murphy@....com>, <yi.l.liu@...el.com>,
        <alex.williamson@...hat.com>, <jgg@...dia.com>,
        <nicolinc@...dia.com>, <baolu.lu@...ux.intel.com>,
        <eric.auger@...hat.com>, <pandoh@...gle.com>,
        <kumaranand@...gle.com>, <jon.grimm@....com>,
        <santosh.shukla@....com>, <vasant.hegde@....com>,
        <jay.chen@....com>, <joseph.chung@....com>,
        "Suravee Suthikulpanit" <suravee.suthikulpanit@....com>
Subject: [RFC PATCH 03/21] iommu/amd: Update PASID, GATS, and GLX feature related macros

Clean up and reorder them according to the bit index. There is no
functional change.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
 drivers/iommu/amd/amd_iommu_types.h | 13 +++++++------
 drivers/iommu/amd/init.c            | 10 +++++-----
 2 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index 2ddbda3a4374..09df25779fe9 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -93,18 +93,19 @@
 #define FEATURE_GA		(1ULL<<7)
 #define FEATURE_HE		(1ULL<<8)
 #define FEATURE_PC		(1ULL<<9)
-#define FEATURE_GATS_SHIFT	(12)
-#define FEATURE_GATS_MASK	(3ULL)
 #define FEATURE_GAM_VAPIC	(1ULL<<21)
 #define FEATURE_GIOSUP		(1ULL<<48)
 #define FEATURE_EPHSUP		(1ULL<<50)
 #define FEATURE_SNP		(1ULL<<63)
 
-#define FEATURE_PASID_SHIFT	32
-#define FEATURE_PASID_MASK	(0x1fULL << FEATURE_PASID_SHIFT)
+#define FEATURE_GATS_SHIFT	12
+#define FEATURE_GATS_MASK	(0x03ULL << FEATURE_GATS_SHIFT)
 
-#define FEATURE_GLXVAL_SHIFT	14
-#define FEATURE_GLXVAL_MASK	(0x03ULL << FEATURE_GLXVAL_SHIFT)
+#define FEATURE_GLX_SHIFT	14
+#define FEATURE_GLX_MASK	(0x03ULL << FEATURE_GLX_SHIFT)
+
+#define FEATURE_PASMAX_SHIFT	32
+#define FEATURE_PASMAX_MASK	(0x1FULL << FEATURE_PASMAX_SHIFT)
 
 /* Extended Feature 2 Bits */
 #define FEATURE_SNPAVICSUP_SHIFT	5
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 886cf55e75e2..6a045a187971 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -310,7 +310,7 @@ static bool check_feature_on_all_iommus(u64 mask)
 
 static inline int check_feature_gpt_level(void)
 {
-	return ((amd_iommu_efr >> FEATURE_GATS_SHIFT) & FEATURE_GATS_MASK);
+	return ((amd_iommu_efr && FEATURE_GATS_MASK) >> FEATURE_GATS_SHIFT);
 }
 
 /*
@@ -2039,16 +2039,16 @@ static int __init iommu_init_pci(struct amd_iommu *iommu)
 		u32 max_pasid;
 		u64 pasmax;
 
-		pasmax = iommu->features & FEATURE_PASID_MASK;
-		pasmax >>= FEATURE_PASID_SHIFT;
+		pasmax = iommu->features & FEATURE_PASMAX_MASK;
+		pasmax >>= FEATURE_PASMAX_SHIFT;
 		max_pasid  = (1 << (pasmax + 1)) - 1;
 
 		amd_iommu_max_pasid = min(amd_iommu_max_pasid, max_pasid);
 
 		BUG_ON(amd_iommu_max_pasid & ~PASID_MASK);
 
-		glxval   = iommu->features & FEATURE_GLXVAL_MASK;
-		glxval >>= FEATURE_GLXVAL_SHIFT;
+		glxval   = iommu->features & FEATURE_GLX_MASK;
+		glxval >>= FEATURE_GLX_SHIFT;
 
 		if (amd_iommu_max_glx_val == -1)
 			amd_iommu_max_glx_val = glxval;
-- 
2.34.1