linux-kernel - [PATCH 1/3] RDMA/hns: Fix the issue of IOVA not page continuous in hip08

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Date:   Mon, 27 Nov 2017 10:41:22 +0800
From:   "Wei Hu (Xavier)" <xavier.huwei@...wei.com>
To:     <dledford@...hat.com>
CC:     <xavier.huwei@...wei.com>, <linux-rdma@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <xavier.huwei@....com>,
        <xavier_huwei@....com>, <linuxarm@...wei.com>
Subject: [PATCH 1/3] RDMA/hns: Fix the issue of IOVA not page continuous in hip08

If the smmu is enabled, the length of sg obtained from
__iommu_map_sg_attrs is not 4kB. When the IOVA is set with the sg
dma address, the IOVA will not be page continuous.
In order to fix this issue, the IOVA should be calculated based on
the sg length.

Signed-off-by: Wei Hu (Xavier) <xavier.huwei@...wei.com>
Signed-off-by: Shaobo Xu <xushaobo2@...wei.com>
Signed-off-by: Lijun Ou <oulijun@...wei.com>
Signed-off-by: Yixian Liu <liuyixian@...wei.com>
Signed-off-by: Xiping Zhang (Francis) <zhangxiping3@...wei.com>
---
 drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index 04281d0..4d3e976 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -1131,9 +1131,11 @@ static int hns_roce_v2_write_mtpt(void *mb_buf, struct hns_roce_mr *mr,
 {
 	struct hns_roce_v2_mpt_entry *mpt_entry;
 	struct scatterlist *sg;
+	u64 page_addr;
 	u64 *pages;
+	int i, j;
+	int len;
 	int entry;
-	int i;
 
 	mpt_entry = mb_buf;
 	memset(mpt_entry, 0, sizeof(*mpt_entry));
@@ -1191,14 +1193,20 @@ static int hns_roce_v2_write_mtpt(void *mb_buf, struct hns_roce_mr *mr,
 
 	i = 0;
 	for_each_sg(mr->umem->sg_head.sgl, sg, mr->umem->nmap, entry) {
-		pages[i] = ((u64)sg_dma_address(sg)) >> 6;
-
-		/* Record the first 2 entry directly to MTPT table */
-		if (i >= HNS_ROCE_V2_MAX_INNER_MTPT_NUM - 1)
-			break;
-		i++;
+		len = sg_dma_len(sg) >> PAGE_SHIFT;
+		for (j = 0; j < len; ++j) {
+			page_addr = sg_dma_address(sg) +
+				    (j << mr->umem->page_shift);
+			pages[i] = page_addr >> 6;
+
+			/* Record the first 2 entry directly to MTPT table */
+			if (i >= HNS_ROCE_V2_MAX_INNER_MTPT_NUM - 1)
+				goto found;
+			i++;
+		}
 	}
 
+found:
 	mpt_entry->pa0_l = cpu_to_le32(lower_32_bits(pages[0]));
 	roce_set_field(mpt_entry->byte_56_pa0_h, V2_MPT_BYTE_56_PA0_H_M,
 		       V2_MPT_BYTE_56_PA0_H_S,
-- 
1.9.1