linux-kernel - [PATCH v6 13/15] iommu/io-pgtable-arm-v7s: Implement arm_v7s_map

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Date:   Tue, 15 Jun 2021 10:08:31 -0700
From:   Georgi Djakov <quic_c_gdjako@...cinc.com>
To:     <will@...nel.org>, <robin.murphy@....com>
CC:     <joro@...tes.org>, <isaacm@...eaurora.org>,
        <baolu.lu@...ux.intel.com>, <pratikp@...eaurora.org>,
        <iommu@...ts.linux-foundation.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <djakov@...nel.org>
Subject: [PATCH v6 13/15] iommu/io-pgtable-arm-v7s: Implement arm_v7s_map_pages()

From: "Isaac J. Manjarres" <isaacm@...eaurora.org>

Implement the map_pages() callback for the ARM v7s io-pgtable
format.

Signed-off-by: Isaac J. Manjarres <isaacm@...eaurora.org>
Signed-off-by: Georgi Djakov <quic_c_gdjako@...cinc.com>
---
 drivers/iommu/io-pgtable-arm-v7s.c | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c
index 1af060686985..5db90d7ce2ec 100644
--- a/drivers/iommu/io-pgtable-arm-v7s.c
+++ b/drivers/iommu/io-pgtable-arm-v7s.c
@@ -519,11 +519,12 @@ static int __arm_v7s_map(struct arm_v7s_io_pgtable *data, unsigned long iova,
 	return __arm_v7s_map(data, iova, paddr, size, prot, lvl + 1, cptep, gfp);
 }
 
-static int arm_v7s_map(struct io_pgtable_ops *ops, unsigned long iova,
-			phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
+static int arm_v7s_map_pages(struct io_pgtable_ops *ops, unsigned long iova,
+			     phys_addr_t paddr, size_t pgsize, size_t pgcount,
+			     int prot, gfp_t gfp, size_t *mapped)
 {
 	struct arm_v7s_io_pgtable *data = io_pgtable_ops_to_data(ops);
-	int ret;
+	int ret = -EINVAL;
 
 	if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias) ||
 		    paddr >= (1ULL << data->iop.cfg.oas)))
@@ -533,7 +534,17 @@ static int arm_v7s_map(struct io_pgtable_ops *ops, unsigned long iova,
 	if (!(prot & (IOMMU_READ | IOMMU_WRITE)))
 		return 0;
 
-	ret = __arm_v7s_map(data, iova, paddr, size, prot, 1, data->pgd, gfp);
+	while (pgcount--) {
+		ret = __arm_v7s_map(data, iova, paddr, pgsize, prot, 1, data->pgd,
+				    gfp);
+		if (ret)
+			break;
+
+		iova += pgsize;
+		paddr += pgsize;
+		if (mapped)
+			*mapped += pgsize;
+	}
 	/*
 	 * 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.
@@ -543,6 +554,12 @@ static int arm_v7s_map(struct io_pgtable_ops *ops, unsigned long iova,
 	return ret;
 }
 
+static int arm_v7s_map(struct io_pgtable_ops *ops, unsigned long iova,
+		       phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
+{
+	return arm_v7s_map_pages(ops, iova, paddr, size, 1, prot, gfp, NULL);
+}
+
 static void arm_v7s_free_pgtable(struct io_pgtable *iop)
 {
 	struct arm_v7s_io_pgtable *data = io_pgtable_to_data(iop);
@@ -797,6 +814,7 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
 
 	data->iop.ops = (struct io_pgtable_ops) {
 		.map		= arm_v7s_map,
+		.map_pages	= arm_v7s_map_pages,
 		.unmap		= arm_v7s_unmap,
 		.unmap_pages	= arm_v7s_unmap_pages,
 		.iova_to_phys	= arm_v7s_iova_to_phys,