iommu/io-pgtable: Add helper functions for TLB ops

Add some simple wrappers to avoid having the guts of the TLB operations
spilled all over the page table implementations, and to provide a point
to implement extra common functionality.
Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

drivers/iommu/io-pgtable-arm-v7s.c

@@ -417,9 +417,7 @@ static int arm_v7s_map(struct io_pgtable_ops *ops, unsigned long iova,
 			phys_addr_t paddr, size_t size, int prot)
 {
 	struct arm_v7s_io_pgtable *data = io_pgtable_ops_to_data(ops);
-	struct io_pgtable_cfg *cfg = &data->iop.cfg;
-	const struct iommu_gather_ops *tlb = cfg->tlb;
-	void *cookie = data->iop.cookie;
+	struct io_pgtable *iop = &data->iop;
 	int ret;
 
 	/* If no access, then nothing to do */
@@ -431,10 +429,10 @@ static int arm_v7s_map(struct io_pgtable_ops *ops, unsigned long iova,
 	 * Synchronise all PTE updates for the new mapping before there's
 	 * a chance for anything to kick off a table walk for the new iova.
 	 */
-	if (cfg->quirks & IO_PGTABLE_QUIRK_TLBI_ON_MAP) {
-		tlb->tlb_add_flush(iova, size, ARM_V7S_BLOCK_SIZE(2), false,
-				   cookie);
-		tlb->tlb_sync(cookie);
+	if (iop->cfg.quirks & IO_PGTABLE_QUIRK_TLBI_ON_MAP) {
+		io_pgtable_tlb_add_flush(iop, iova, size,
+					 ARM_V7S_BLOCK_SIZE(2), false);
+		io_pgtable_tlb_sync(iop);
 	} else {
 		wmb();
 	}
@@ -462,8 +460,7 @@ static void arm_v7s_split_cont(struct arm_v7s_io_pgtable *data,
 			       unsigned long iova, int idx, int lvl,
 			       arm_v7s_iopte *ptep)
 {
-	struct io_pgtable_cfg *cfg = &data->iop.cfg;
-	void *cookie = data->iop.cookie;
+	struct io_pgtable *iop = &data->iop;
 	arm_v7s_iopte pte;
 	size_t size = ARM_V7S_BLOCK_SIZE(lvl);
 	int i;
@@ -475,11 +472,11 @@ static void arm_v7s_split_cont(struct arm_v7s_io_pgtable *data,
 		pte += size;
 	}
 
-	__arm_v7s_pte_sync(ptep, ARM_V7S_CONT_PAGES, cfg);
+	__arm_v7s_pte_sync(ptep, ARM_V7S_CONT_PAGES, &iop->cfg);
 
 	size *= ARM_V7S_CONT_PAGES;
-	cfg->tlb->tlb_add_flush(iova, size, size, true, cookie);
-	cfg->tlb->tlb_sync(cookie);
+	io_pgtable_tlb_add_flush(iop, iova, size, size, true);
+	io_pgtable_tlb_sync(iop);
 }
 
 static int arm_v7s_split_blk_unmap(struct arm_v7s_io_pgtable *data,
@@ -489,7 +486,6 @@ static int arm_v7s_split_blk_unmap(struct arm_v7s_io_pgtable *data,
 	unsigned long blk_start, blk_end, blk_size;
 	phys_addr_t blk_paddr;
 	arm_v7s_iopte table = 0;
-	struct io_pgtable_cfg *cfg = &data->iop.cfg;
 	int prot = arm_v7s_pte_to_prot(*ptep, 1);
 
 	blk_size = ARM_V7S_BLOCK_SIZE(1);
@@ -517,9 +513,9 @@ static int arm_v7s_split_blk_unmap(struct arm_v7s_io_pgtable *data,
 		}
 	}
 
-	__arm_v7s_set_pte(ptep, table, 1, cfg);
+	__arm_v7s_set_pte(ptep, table, 1, &data->iop.cfg);
 	iova &= ~(blk_size - 1);
-	cfg->tlb->tlb_add_flush(iova, blk_size, blk_size, true, data->iop.cookie);
+	io_pgtable_tlb_add_flush(&data->iop, iova, blk_size, blk_size, true);
 	return size;
 }
 
@@ -528,9 +524,7 @@ static int __arm_v7s_unmap(struct arm_v7s_io_pgtable *data,
 			    arm_v7s_iopte *ptep)
 {
 	arm_v7s_iopte pte[ARM_V7S_CONT_PAGES];
-	struct io_pgtable_cfg *cfg = &data->iop.cfg;
-	const struct iommu_gather_ops *tlb = cfg->tlb;
-	void *cookie = data->iop.cookie;
+	struct io_pgtable *iop = &data->iop;
 	int idx, i = 0, num_entries = size >> ARM_V7S_LVL_SHIFT(lvl);
 
 	/* Something went horribly wrong and we ran out of page table */
@@ -556,20 +550,19 @@ static int __arm_v7s_unmap(struct arm_v7s_io_pgtable *data,
 	if (num_entries) {
 		size_t blk_size = ARM_V7S_BLOCK_SIZE(lvl);
 
-		__arm_v7s_set_pte(ptep, 0, num_entries, cfg);
+		__arm_v7s_set_pte(ptep, 0, num_entries, &iop->cfg);
 
 		for (i = 0; i < num_entries; i++) {
 			if (ARM_V7S_PTE_IS_TABLE(pte[i], lvl)) {
 				/* Also flush any partial walks */
-				tlb->tlb_add_flush(iova, blk_size,
-						   ARM_V7S_BLOCK_SIZE(lvl + 1),
-						   false, cookie);
-				tlb->tlb_sync(cookie);
+				io_pgtable_tlb_add_flush(iop, iova, blk_size,
+					ARM_V7S_BLOCK_SIZE(lvl + 1), false);
+				io_pgtable_tlb_sync(iop);
 				ptep = iopte_deref(pte[i], lvl);
 				__arm_v7s_free_table(ptep, lvl + 1, data);
 			} else {
-				tlb->tlb_add_flush(iova, blk_size, blk_size,
-						   true, cookie);
+				io_pgtable_tlb_add_flush(iop, iova, blk_size,
+							 blk_size, true);
 			}
 			iova += blk_size;
 		}
@@ -590,13 +583,12 @@ static int __arm_v7s_unmap(struct arm_v7s_io_pgtable *data,
 static int arm_v7s_unmap(struct io_pgtable_ops *ops, unsigned long iova,
 			 size_t size)
 {
-	size_t unmapped;
 	struct arm_v7s_io_pgtable *data = io_pgtable_ops_to_data(ops);
-	struct io_pgtable *iop = &data->iop;
+	size_t unmapped;
 
 	unmapped = __arm_v7s_unmap(data, iova, size, 1, data->pgd);
 	if (unmapped)
-		iop->cfg.tlb->tlb_sync(iop->cookie);
+		io_pgtable_tlb_sync(&data->iop);
 
 	return unmapped;
 }

drivers/iommu/io-pgtable-arm.c

@@ -446,7 +446,6 @@ static int arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
 	unsigned long blk_start, blk_end;
 	phys_addr_t blk_paddr;
 	arm_lpae_iopte table = 0;
-	struct io_pgtable_cfg *cfg = &data->iop.cfg;
 
 	blk_start = iova & ~(blk_size - 1);
 	blk_end = blk_start + blk_size;
@@ -472,9 +471,9 @@ static int arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
 		}
 	}
 
-	__arm_lpae_set_pte(ptep, table, cfg);
+	__arm_lpae_set_pte(ptep, table, &data->iop.cfg);
 	iova &= ~(blk_size - 1);
-	cfg->tlb->tlb_add_flush(iova, blk_size, blk_size, true, data->iop.cookie);
+	io_pgtable_tlb_add_flush(&data->iop, iova, blk_size, blk_size, true);
 	return size;
 }
 
@@ -483,8 +482,7 @@ static int __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
 			    arm_lpae_iopte *ptep)
 {
 	arm_lpae_iopte pte;
-	const struct iommu_gather_ops *tlb = data->iop.cfg.tlb;
-	void *cookie = data->iop.cookie;
+	struct io_pgtable *iop = &data->iop;
 	size_t blk_size = ARM_LPAE_BLOCK_SIZE(lvl, data);
 
 	/* Something went horribly wrong and we ran out of page table */
@@ -498,17 +496,17 @@ static int __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
 
 	/* If the size matches this level, we're in the right place */
 	if (size == blk_size) {
-		__arm_lpae_set_pte(ptep, 0, &data->iop.cfg);
+		__arm_lpae_set_pte(ptep, 0, &iop->cfg);
 
 		if (!iopte_leaf(pte, lvl)) {
 			/* Also flush any partial walks */
-			tlb->tlb_add_flush(iova, size, ARM_LPAE_GRANULE(data),
-					   false, cookie);
-			tlb->tlb_sync(cookie);
+			io_pgtable_tlb_add_flush(iop, iova, size,
+						ARM_LPAE_GRANULE(data), false);
+			io_pgtable_tlb_sync(iop);
 			ptep = iopte_deref(pte, data);
 			__arm_lpae_free_pgtable(data, lvl + 1, ptep);
 		} else {
-			tlb->tlb_add_flush(iova, size, size, true, cookie);
+			io_pgtable_tlb_add_flush(iop, iova, size, size, true);
 		}
 
 		return size;
@@ -532,13 +530,12 @@ static int arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
 {
 	size_t unmapped;
 	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
-	struct io_pgtable *iop = &data->iop;
 	arm_lpae_iopte *ptep = data->pgd;
 	int lvl = ARM_LPAE_START_LVL(data);
 
 	unmapped = __arm_lpae_unmap(data, iova, size, lvl, ptep);
 	if (unmapped)
-		iop->cfg.tlb->tlb_sync(iop->cookie);
+		io_pgtable_tlb_sync(&data->iop);
 
 	return unmapped;
 }

drivers/iommu/io-pgtable.c

@@ -75,6 +75,6 @@ void free_io_pgtable_ops(struct io_pgtable_ops *ops)
 		return;
 
 	iop = container_of(ops, struct io_pgtable, ops);
-	iop->cfg.tlb->tlb_flush_all(iop->cookie);
+	io_pgtable_tlb_flush_all(iop);
 	io_pgtable_init_table[iop->fmt]->free(iop);
 }

drivers/iommu/io-pgtable.h

@@ -144,6 +144,22 @@ struct io_pgtable {
 
 #define io_pgtable_ops_to_pgtable(x) container_of((x), struct io_pgtable, ops)
 
+static inline void io_pgtable_tlb_flush_all(struct io_pgtable *iop)
+{
+	iop->cfg.tlb->tlb_flush_all(iop->cookie);
+}
+
+static inline void io_pgtable_tlb_add_flush(struct io_pgtable *iop,
+		unsigned long iova, size_t size, size_t granule, bool leaf)
+{
+	iop->cfg.tlb->tlb_add_flush(iova, size, granule, leaf, iop->cookie);
+}
+
+static inline void io_pgtable_tlb_sync(struct io_pgtable *iop)
+{
+	iop->cfg.tlb->tlb_sync(iop->cookie);
+}
+
 /**
  * struct io_pgtable_init_fns - Alloc/free a set of page tables for a
  *                              particular format.