linux-kernel - [PATCH v2 2/2] ntb_hw_switchtec: Check for alignment of the buffer in mw_set

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Date:   Mon, 18 Dec 2017 11:25:06 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-ntb@...glegroups.com, linux-kernel@...r.kernel.org
Cc:     Allen.Hubbe@...l.com, Logan Gunthorpe <logang@...tatee.com>,
        Jon Mason <jdmason@...zu.us>
Subject: [PATCH v2 2/2] ntb_hw_switchtec: Check for alignment of the buffer in mw_set_trans()

With Switchtec hardware, the buffer used for a memory window must be
aligned to its size (the hardware only replaces the lower bits). In
certain circumstances dma_alloc_coherent() will not provide a buffer
that adheres to this requirement like when using the CMA and
CONFIG_CMA_ALIGNMENT is set lower than the buffer size.

When we get an unaligned buffer mw_set_trans() should return an error.
We also log an error so we know the cause of the problem.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Cc: Jon Mason <jdmason@...zu.us>
---

v2: Use IS_ALIGNED macro as suggested by Allen

 drivers/ntb/hw/mscc/ntb_hw_switchtec.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
index bcd5b6fb3800..6c6f991999b5 100644
--- a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
+++ b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
@@ -320,6 +320,19 @@ static int switchtec_ntb_mw_set_trans(struct ntb_dev *ntb, int pidx, int widx,
 	if (xlate_pos < 12)
 		return -EINVAL;

+	if (!IS_ALIGNED(addr, BIT_ULL(xlate_pos))) {
+		/*
+		 * In certain circumstances we can get a buffer that is
+		 * not aligned to its size. (Most of the time
+		 * dma_alloc_coherent ensures this). This can happen when
+		 * using large buffers allocated by the CMA
+		 * (see CMA_CONFIG_ALIGNMENT)
+		 */
+		dev_err(&sndev->stdev->dev,
+			"ERROR: Memory window address is not aligned to it's size!\n");
+		return -EINVAL;
+	}
+
 	rc = switchtec_ntb_part_op(sndev, ctl, NTB_CTRL_PART_OP_LOCK,
 				   NTB_CTRL_PART_STATUS_LOCKED);
 	if (rc)
--
2.11.0