[PATCH v8 02/25] iommu/arm-smmu-v3: Move Queue and STE functions to header

[Mostafa Saleh]

The KVM SMMUv3 driver would re-use some of the CMDQ and STE code
inside the hypervisor. Move those functions to the header file that
would be shared between the host kernel and the hypervisor.

Signed-off-by: Mostafa Saleh <smostafa at google.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 59 --------------------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 62 +++++++++++++++++++++
 2 files changed, 62 insertions(+), 59 deletions(-)

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 5732f3ba0122..df1924969212 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -134,33 +134,6 @@ static void parse_driver_options(struct arm_smmu_device *smmu)
 }
 
 /* Low-level queue manipulation functions */
-static bool queue_has_space(struct arm_smmu_ll_queue *q, u32 n)
-{
-	u32 space, prod, cons;
-
-	prod = Q_IDX(q, q->prod);
-	cons = Q_IDX(q, q->cons);
-
-	if (Q_WRP(q, q->prod) == Q_WRP(q, q->cons))
-		space = (1 << q->max_n_shift) - (prod - cons);
-	else
-		space = cons - prod;
-
-	return space >= n;
-}
-
-static bool queue_full(struct arm_smmu_ll_queue *q)
-{
-	return Q_IDX(q, q->prod) == Q_IDX(q, q->cons) &&
-	       Q_WRP(q, q->prod) != Q_WRP(q, q->cons);
-}
-
-static bool queue_empty(struct arm_smmu_ll_queue *q)
-{
-	return Q_IDX(q, q->prod) == Q_IDX(q, q->cons) &&
-	       Q_WRP(q, q->prod) == Q_WRP(q, q->cons);
-}
-
 static bool queue_consumed(struct arm_smmu_ll_queue *q, u32 prod)
 {
 	return ((Q_WRP(q, q->cons) == Q_WRP(q, prod)) &&
@@ -179,12 +152,6 @@ static void queue_sync_cons_out(struct arm_smmu_queue *q)
 	writel_relaxed(q->llq.cons, q->cons_reg);
 }
 
-static void queue_inc_cons(struct arm_smmu_ll_queue *q)
-{
-	u32 cons = (Q_WRP(q, q->cons) | Q_IDX(q, q->cons)) + 1;
-	q->cons = Q_OVF(q->cons) | Q_WRP(q, cons) | Q_IDX(q, cons);
-}
-
 static void queue_sync_cons_ovf(struct arm_smmu_queue *q)
 {
 	struct arm_smmu_ll_queue *llq = &q->llq;
@@ -216,12 +183,6 @@ static int queue_sync_prod_in(struct arm_smmu_queue *q)
 	return ret;
 }
 
-static u32 queue_inc_prod_n(struct arm_smmu_ll_queue *q, int n)
-{
-	u32 prod = (Q_WRP(q, q->prod) | Q_IDX(q, q->prod)) + n;
-	return Q_OVF(q->prod) | Q_WRP(q, prod) | Q_IDX(q, prod);
-}
-
 static void queue_poll_init(struct arm_smmu_device *smmu,
 			    struct arm_smmu_queue_poll *qp)
 {
@@ -249,14 +210,6 @@ static int queue_poll(struct arm_smmu_queue_poll *qp)
 	return 0;
 }
 
-static void queue_write(__le64 *dst, u64 *src, size_t n_dwords)
-{
-	int i;
-
-	for (i = 0; i < n_dwords; ++i)
-		*dst++ = cpu_to_le64(*src++);
-}
-
 static void queue_read(u64 *dst, __le64 *src, size_t n_dwords)
 {
 	int i;
@@ -1796,18 +1749,6 @@ static void arm_smmu_free_cd_tables(struct arm_smmu_master *master)
 }
 
 /* Stream table manipulation functions */
-static void arm_smmu_write_strtab_l1_desc(struct arm_smmu_strtab_l1 *dst,
-					  dma_addr_t l2ptr_dma)
-{
-	u64 val = 0;
-
-	val |= FIELD_PREP(STRTAB_L1_DESC_SPAN, STRTAB_SPLIT + 1);
-	val |= l2ptr_dma & STRTAB_L1_DESC_L2PTR_MASK;
-
-	/* The HW has 64 bit atomicity with stores to the L2 STE table */
-	WRITE_ONCE(dst->l2ptr, cpu_to_le64(val));
-}
-
 struct arm_smmu_ste_writer {
 	struct arm_smmu_entry_writer writer;
 	u32 sid;
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index dd2fee2f560e..5b23f6ee78d4 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -1223,6 +1223,68 @@ int arm_smmu_cmdq_issue_cmdlist(struct arm_smmu_device *smmu,
 				bool sync);
 bool arm_smmu_erratum_repeat_tlbi_cfgi(void);
 
+/* Queue and STE functions shared between kernel and hyp. */
+static inline bool queue_has_space(struct arm_smmu_ll_queue *q, u32 n)
+{
+	u32 space, prod, cons;
+
+	prod = Q_IDX(q, q->prod);
+	cons = Q_IDX(q, q->cons);
+
+	if (Q_WRP(q, q->prod) == Q_WRP(q, q->cons))
+		space = (1 << q->max_n_shift) - (prod - cons);
+	else
+		space = cons - prod;
+
+	return space >= n;
+}
+
+static inline bool queue_full(struct arm_smmu_ll_queue *q)
+{
+	return Q_IDX(q, q->prod) == Q_IDX(q, q->cons) &&
+	       Q_WRP(q, q->prod) != Q_WRP(q, q->cons);
+}
+
+static inline bool queue_empty(struct arm_smmu_ll_queue *q)
+{
+	return Q_IDX(q, q->prod) == Q_IDX(q, q->cons) &&
+	       Q_WRP(q, q->prod) == Q_WRP(q, q->cons);
+}
+
+static inline u32 queue_inc_prod_n(struct arm_smmu_ll_queue *q, int n)
+{
+	u32 prod = (Q_WRP(q, q->prod) | Q_IDX(q, q->prod)) + n;
+
+	return Q_OVF(q->prod) | Q_WRP(q, prod) | Q_IDX(q, prod);
+}
+
+static inline void queue_inc_cons(struct arm_smmu_ll_queue *q)
+{
+	u32 cons = (Q_WRP(q, q->cons) | Q_IDX(q, q->cons)) + 1;
+
+	q->cons = Q_OVF(q->cons) | Q_WRP(q, cons) | Q_IDX(q, cons);
+}
+
+static inline void queue_write(__le64 *dst, u64 *src, size_t n_dwords)
+{
+	int i;
+
+	for (i = 0; i < n_dwords; ++i)
+		*dst++ = cpu_to_le64(*src++);
+}
+
+static inline void arm_smmu_write_strtab_l1_desc(struct arm_smmu_strtab_l1 *dst,
+						 dma_addr_t l2ptr_dma)
+{
+	u64 val = 0;
+
+	val |= FIELD_PREP(STRTAB_L1_DESC_SPAN, STRTAB_SPLIT + 1);
+	val |= l2ptr_dma & STRTAB_L1_DESC_L2PTR_MASK;
+
+	/* The HW has 64 bit atomicity with stores to the L2 STE table */
+	WRITE_ONCE(dst->l2ptr, cpu_to_le64(val));
+}
+
 #ifdef CONFIG_ARM_SMMU_V3_SVA
 bool arm_smmu_sva_supported(struct arm_smmu_device *smmu);
 void arm_smmu_sva_notifier_synchronize(void);
-- 
2.55.0.1082.g2b9226bbc0-goog