[PATCH 5/5] iommu: Delete IOMMU_CAP_CACHE_COHERENCY

[Jason Gunthorpe via iommu <iommu@lists.linux-foundation.org>]

Nothing reads this value anymore, remove it.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/amd/iommu.c                   | 2 --
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 2 --
 drivers/iommu/arm/arm-smmu/arm-smmu.c       | 6 ------
 drivers/iommu/arm/arm-smmu/qcom_iommu.c     | 6 ------
 drivers/iommu/fsl_pamu_domain.c             | 6 ------
 drivers/iommu/intel/iommu.c                 | 2 --
 drivers/iommu/s390-iommu.c                  | 2 --
 include/linux/iommu.h                       | 2 --
 8 files changed, 28 deletions(-)

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index e500b487eb3429..f144eb9fea8e31 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2156,8 +2156,6 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
 static bool amd_iommu_capable(enum iommu_cap cap)
 {
 	switch (cap) {
-	case IOMMU_CAP_CACHE_COHERENCY:
-		return true;
 	case IOMMU_CAP_INTR_REMAP:
 		return (irq_remapping_enabled == 1);
 	case IOMMU_CAP_NOEXEC:
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 627a3ed5ee8fd1..c4115015a633a7 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1986,8 +1986,6 @@ static const struct iommu_flush_ops arm_smmu_flush_ops = {
 static bool arm_smmu_capable(enum iommu_cap cap)
 {
 	switch (cap) {
-	case IOMMU_CAP_CACHE_COHERENCY:
-		return true;
 	case IOMMU_CAP_NOEXEC:
 		return true;
 	default:
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 568cce590ccc13..166bf45ac3d444 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1333,12 +1333,6 @@ static phys_addr_t arm_smmu_iova_to_phys(struct iommu_domain *domain,
 static bool arm_smmu_capable(enum iommu_cap cap)
 {
 	switch (cap) {
-	case IOMMU_CAP_CACHE_COHERENCY:
-		/*
-		 * Return true here as the SMMU can always send out coherent
-		 * requests.
-		 */
-		return true;
 	case IOMMU_CAP_NOEXEC:
 		return true;
 	default:
diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
index 4c077c38fbd64f..fc72465fc63d50 100644
--- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c
+++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
@@ -496,12 +496,6 @@ static phys_addr_t qcom_iommu_iova_to_phys(struct iommu_domain *domain,
 static bool qcom_iommu_capable(enum iommu_cap cap)
 {
 	switch (cap) {
-	case IOMMU_CAP_CACHE_COHERENCY:
-		/*
-		 * Return true here as the SMMU can always send out coherent
-		 * requests.
-		 */
-		return true;
 	case IOMMU_CAP_NOEXEC:
 		return true;
 	default:
diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index 69a4a62dc3b9c7..9f80285dab2951 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -177,11 +177,6 @@ static phys_addr_t fsl_pamu_iova_to_phys(struct iommu_domain *domain,
 	return iova;
 }
 
-static bool fsl_pamu_capable(enum iommu_cap cap)
-{
-	return cap == IOMMU_CAP_CACHE_COHERENCY;
-}
-
 static void fsl_pamu_domain_free(struct iommu_domain *domain)
 {
 	struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
@@ -451,7 +446,6 @@ static void fsl_pamu_release_device(struct device *dev)
 }
 
 static const struct iommu_ops fsl_pamu_ops = {
-	.capable	= fsl_pamu_capable,
 	.domain_alloc	= fsl_pamu_domain_alloc,
 	.probe_device	= fsl_pamu_probe_device,
 	.release_device	= fsl_pamu_release_device,
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 0ca43671d934e9..e5062461ab0640 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4557,8 +4557,6 @@ static bool intel_iommu_enforce_cache_coherency(struct iommu_domain *domain)
 
 static bool intel_iommu_capable(enum iommu_cap cap)
 {
-	if (cap == IOMMU_CAP_CACHE_COHERENCY)
-		return domain_update_iommu_snooping(NULL);
 	if (cap == IOMMU_CAP_INTR_REMAP)
 		return irq_remapping_enabled == 1;
 
diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index 3833e86c6e7b8a..3dbf9663246552 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -42,8 +42,6 @@ static struct s390_domain *to_s390_domain(struct iommu_domain *dom)
 static bool s390_iommu_capable(enum iommu_cap cap)
 {
 	switch (cap) {
-	case IOMMU_CAP_CACHE_COHERENCY:
-		return true;
 	case IOMMU_CAP_INTR_REMAP:
 		return true;
 	default:
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index fe4f24c469c373..aebb73bda19797 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -103,8 +103,6 @@ static inline bool iommu_is_dma_domain(struct iommu_domain *domain)
 }
 
 enum iommu_cap {
-	IOMMU_CAP_CACHE_COHERENCY,	/* IOMMU can enforce cache coherent DMA
-					   transactions */
 	IOMMU_CAP_INTR_REMAP,		/* IOMMU supports interrupt isolation */
 	IOMMU_CAP_NOEXEC,		/* IOMMU_NOEXEC flag */
 };
-- 
2.35.1

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