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From:   Krishna Reddy <vdumpa@nvidia.com>
CC:     <joro@8bytes.org>, <will@kernel.org>, <robin.murphy@arm.com>,
        <linux-arm-kernel@lists.infradead.org>,
        <iommu@lists.linux-foundation.org>, <linux-kernel@vger.kernel.org>,
        <linux-tegra@vger.kernel.org>, <treding@nvidia.com>,
        <yhsu@nvidia.com>, <snikam@nvidia.com>, <praithatha@nvidia.com>,
        <talho@nvidia.com>, <avanbrunt@nvidia.com>, <thomasz@nvidia.com>,
        <olof@lixom.net>, <jtukkinen@nvidia.com>, <mperttunen@nvidia.com>,
        Krishna Reddy <vdumpa@nvidia.com>
Subject: [PATCH v2 1/7] iommu/arm-smmu: prepare arm_smmu_flush_ops for override
Date:   Mon, 2 Sep 2019 20:32:02 -0700
Message-ID: <1567481528-31163-2-git-send-email-vdumpa@nvidia.com>
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Remove const keyword for arm_smmu_flush_ops in arm_smmu_domain
and replace direct references to arm_smmu_tlb_sync* functions with
arm_smmu_flush_ops->tlb_sync().
This is necessary for vendor specific implementations that
need to override arm_smmu_flush_ops in part or full.

Signed-off-by: Krishna Reddy <vdumpa@nvidia.com>
---
 drivers/iommu/arm-smmu.c | 16 ++++++++--------
 drivers/iommu/arm-smmu.h |  4 +++-
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 5b93c79..16b5c54 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -52,9 +52,6 @@
  */
 #define QCOM_DUMMY_VAL -1
 
-#define TLB_LOOP_TIMEOUT		1000000	/* 1s! */
-#define TLB_SPIN_COUNT			10
-
 #define MSI_IOVA_BASE			0x8000000
 #define MSI_IOVA_LENGTH			0x100000
 
@@ -290,6 +287,8 @@ static void arm_smmu_tlb_sync_vmid(void *cookie)
 static void arm_smmu_tlb_inv_context_s1(void *cookie)
 {
 	struct arm_smmu_domain *smmu_domain = cookie;
+	const struct arm_smmu_flush_ops *ops = smmu_domain->flush_ops;
+
 	/*
 	 * The TLBI write may be relaxed, so ensure that PTEs cleared by the
 	 * current CPU are visible beforehand.
@@ -297,18 +296,19 @@ static void arm_smmu_tlb_inv_context_s1(void *cookie)
 	wmb();
 	arm_smmu_cb_write(smmu_domain->smmu, smmu_domain->cfg.cbndx,
 			  ARM_SMMU_CB_S1_TLBIASID, smmu_domain->cfg.asid);
-	arm_smmu_tlb_sync_context(cookie);
+	ops->tlb_sync(cookie);
 }
 
 static void arm_smmu_tlb_inv_context_s2(void *cookie)
 {
 	struct arm_smmu_domain *smmu_domain = cookie;
 	struct arm_smmu_device *smmu = smmu_domain->smmu;
+	const struct arm_smmu_flush_ops *ops = smmu_domain->flush_ops;
 
 	/* See above */
 	wmb();
 	arm_smmu_gr0_write(smmu, ARM_SMMU_GR0_TLBIVMID, smmu_domain->cfg.vmid);
-	arm_smmu_tlb_sync_global(smmu);
+	ops->tlb_sync(cookie);
 }
 
 static void arm_smmu_tlb_inv_range_s1(unsigned long iova, size_t size,
@@ -410,7 +410,7 @@ static void arm_smmu_tlb_add_page(struct iommu_iotlb_gather *gather,
 	ops->tlb_inv_range(iova, granule, granule, true, cookie);
 }
 
-static const struct arm_smmu_flush_ops arm_smmu_s1_tlb_ops = {
+static struct arm_smmu_flush_ops arm_smmu_s1_tlb_ops = {
 	.tlb = {
 		.tlb_flush_all	= arm_smmu_tlb_inv_context_s1,
 		.tlb_flush_walk	= arm_smmu_tlb_inv_walk,
@@ -421,7 +421,7 @@ static const struct arm_smmu_flush_ops arm_smmu_s1_tlb_ops = {
 	.tlb_sync		= arm_smmu_tlb_sync_context,
 };
 
-static const struct arm_smmu_flush_ops arm_smmu_s2_tlb_ops_v2 = {
+static struct arm_smmu_flush_ops arm_smmu_s2_tlb_ops_v2 = {
 	.tlb = {
 		.tlb_flush_all	= arm_smmu_tlb_inv_context_s2,
 		.tlb_flush_walk	= arm_smmu_tlb_inv_walk,
@@ -432,7 +432,7 @@ static const struct arm_smmu_flush_ops arm_smmu_s2_tlb_ops_v2 = {
 	.tlb_sync		= arm_smmu_tlb_sync_context,
 };
 
-static const struct arm_smmu_flush_ops arm_smmu_s2_tlb_ops_v1 = {
+static struct arm_smmu_flush_ops arm_smmu_s2_tlb_ops_v1 = {
 	.tlb = {
 		.tlb_flush_all	= arm_smmu_tlb_inv_context_s2,
 		.tlb_flush_walk	= arm_smmu_tlb_inv_walk,
diff --git a/drivers/iommu/arm-smmu.h b/drivers/iommu/arm-smmu.h
index b19b6ca..b2d6c7f 100644
--- a/drivers/iommu/arm-smmu.h
+++ b/drivers/iommu/arm-smmu.h
@@ -207,6 +207,8 @@ enum arm_smmu_cbar_type {
 /* Maximum number of context banks per SMMU */
 #define ARM_SMMU_MAX_CBS		128
 
+#define TLB_LOOP_TIMEOUT		1000000	/* 1s! */
+#define TLB_SPIN_COUNT			10
 
 /* Shared driver definitions */
 enum arm_smmu_arch_version {
@@ -314,7 +316,7 @@ struct arm_smmu_flush_ops {
 struct arm_smmu_domain {
 	struct arm_smmu_device		*smmu;
 	struct io_pgtable_ops		*pgtbl_ops;
-	const struct arm_smmu_flush_ops	*flush_ops;
+	struct arm_smmu_flush_ops	*flush_ops;
 	struct arm_smmu_cfg		cfg;
 	enum arm_smmu_domain_stage	stage;
 	bool				non_strict;
-- 
2.1.4