linux-kernel - [RFC PATCH v4 18/38] NTB: ntb_transport: Use ntb_get_dma

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Message-ID: <20260118135440.1958279-19-den@valinux.co.jp>
Date: Sun, 18 Jan 2026 22:54:20 +0900
From: Koichiro Den <den@...inux.co.jp>
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Subject: [RFC PATCH v4 18/38] NTB: ntb_transport: Use ntb_get_dma_dev()

Replace direct use of ntb->pdev with ntb_get_dma_dev() for DMA-safe
allocations and frees. This allows ntb_transport to operate on NTB
implementations that are not backed by a PCI device from IOMMU
perspective.

Signed-off-by: Koichiro Den <den@...inux.co.jp>
---
 drivers/ntb/ntb_transport.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 6ed680d0470f..7b320249629c 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -771,13 +771,13 @@ static void ntb_transport_msi_desc_changed(void *data)
 static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw)
 {
 	struct ntb_transport_mw *mw = &nt->mw_vec[num_mw];
-	struct pci_dev *pdev = nt->ndev->pdev;
+	struct device *dev = ntb_get_dma_dev(nt->ndev);
 
-	if (!mw->virt_addr)
+	if (!dev || !mw->virt_addr)
 		return;
 
 	ntb_mw_clear_trans(nt->ndev, PIDX, num_mw);
-	dma_free_coherent(&pdev->dev, mw->alloc_size,
+	dma_free_coherent(dev, mw->alloc_size,
 			  mw->alloc_addr, mw->dma_addr);
 	mw->xlat_size = 0;
 	mw->buff_size = 0;
@@ -847,13 +847,13 @@ static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw,
 		      resource_size_t size)
 {
 	struct ntb_transport_mw *mw = &nt->mw_vec[num_mw];
-	struct pci_dev *pdev = nt->ndev->pdev;
+	struct device *dev = ntb_get_dma_dev(nt->ndev);
 	size_t xlat_size, buff_size;
 	resource_size_t xlat_align;
 	resource_size_t xlat_align_size;
 	int rc;
 
-	if (!size)
+	if (!dev || !size)
 		return -EINVAL;
 
 	rc = ntb_mw_get_align(nt->ndev, PIDX, num_mw, &xlat_align,
@@ -876,12 +876,12 @@ static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw,
 	mw->buff_size = buff_size;
 	mw->alloc_size = buff_size;
 
-	rc = ntb_alloc_mw_buffer(mw, &pdev->dev, xlat_align);
+	rc = ntb_alloc_mw_buffer(mw, dev, xlat_align);
 	if (rc) {
 		mw->alloc_size *= 2;
-		rc = ntb_alloc_mw_buffer(mw, &pdev->dev, xlat_align);
+		rc = ntb_alloc_mw_buffer(mw, dev, xlat_align);
 		if (rc) {
-			dev_err(&pdev->dev,
+			dev_err(dev,
 				"Unable to alloc aligned MW buff\n");
 			mw->xlat_size = 0;
 			mw->buff_size = 0;
@@ -894,7 +894,7 @@ static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw,
 	rc = ntb_mw_set_trans(nt->ndev, PIDX, num_mw, mw->dma_addr,
 			      mw->xlat_size);
 	if (rc) {
-		dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw);
+		dev_err(dev, "Unable to set mw%d translation", num_mw);
 		ntb_free_mw(nt, num_mw);
 		return -EIO;
 	}
-- 
2.51.0