linux-kernel - [RFCv2 PATCH 3/7] iommu/amd: Update PASID, GATS, and GLX feature related macros

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Date: Thu, 11 Jan 2024 18:06:42 -0600
From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To: <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
	<joro@...tes.org>, <jgg@...dia.com>
CC: <yi.l.liu@...el.com>, <kevin.tian@...el.com>, <nicolinc@...dia.com>,
	<eric.auger@...hat.com>, <vasant.hegde@....com>, <jon.grimm@....com>,
	<santosh.shukla@....com>, <Dhaval.Giani@....com>, <pandoh@...gle.com>,
	<loganodell@...gle.com>, Suravee Suthikulpanit
	<suravee.suthikulpanit@....com>
Subject: [RFCv2 PATCH 3/7] 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.h       |  2 +-
 drivers/iommu/amd/amd_iommu_types.h | 13 +++++++------
 drivers/iommu/amd/init.c            |  8 ++++----
 3 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h
index bbed268e8abc..108253edbeb0 100644
--- a/drivers/iommu/amd/amd_iommu.h
+++ b/drivers/iommu/amd/amd_iommu.h
@@ -106,7 +106,7 @@ static inline bool check_feature2(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);
 }
 
 static inline bool amd_iommu_gt_ppr_supported(void)
diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index ff56c857f6ad..f8baa8d88832 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -93,8 +93,6 @@
 #define FEATURE_GA		BIT_ULL(7)
 #define FEATURE_HE		BIT_ULL(8)
 #define FEATURE_PC		BIT_ULL(9)
-#define FEATURE_GATS_SHIFT	(12)
-#define FEATURE_GATS_MASK	(3ULL)
 #define FEATURE_GAM_VAPIC	BIT_ULL(21)
 #define FEATURE_GIOSUP		BIT_ULL(48)
 #define FEATURE_HASUP		BIT_ULL(49)
@@ -102,11 +100,14 @@
 #define FEATURE_HDSUP		BIT_ULL(52)
 #define FEATURE_SNP		BIT_ULL(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 959820ccfbcc..e84c69fe13d4 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -2080,14 +2080,14 @@ static int __init iommu_init_pci(struct amd_iommu *iommu)
 		int glxval;
 		u64 pasmax;
 
-		pasmax = amd_iommu_efr & FEATURE_PASID_MASK;
-		pasmax >>= FEATURE_PASID_SHIFT;
+		pasmax = amd_iommu_efr & FEATURE_PASMAX_MASK;
+		pasmax >>= FEATURE_PASMAX_SHIFT;
 		iommu->iommu.max_pasids = (1 << (pasmax + 1)) - 1;
 
 		BUG_ON(iommu->iommu.max_pasids & ~PASID_MASK);
 
-		glxval   = amd_iommu_efr & FEATURE_GLXVAL_MASK;
-		glxval >>= FEATURE_GLXVAL_SHIFT;
+		glxval   = amd_iommu_efr & FEATURE_GLX_MASK;
+		glxval >>= FEATURE_GLX_SHIFT;
 
 		if (amd_iommu_max_glx_val == -1)
 			amd_iommu_max_glx_val = glxval;
-- 
2.34.1