linux-kernel - [PATCH 3/3] dpaa2_eth: use new unmap and sync dma api variants

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Message-ID: <20191024105534.16102-4-laurentiu.tudor@nxp.com>
Date:   Thu, 24 Oct 2019 10:55:51 +0000
From:   Laurentiu Tudor <laurentiu.tudor@....com>
To:     "hch@....de" <hch@....de>, "joro@...tes.org" <joro@...tes.org>,
        Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Ioana Ciornei <ioana.ciornei@....com>
CC:     Leo Li <leoyang.li@....com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        Diana Madalina Craciun <diana.craciun@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Madalin Bucur <madalin.bucur@....com>,
        Laurentiu Tudor <laurentiu.tudor@....com>
Subject: [PATCH 3/3] dpaa2_eth: use new unmap and sync dma api variants

From: Laurentiu Tudor <laurentiu.tudor@....com>

Convert this driver to usage of the newly introduced dma unmap and
sync DMA APIs. This will get rid of the unsupported direct usage of
iommu_iova_to_phys() API.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
---
 .../net/ethernet/freescale/dpaa2/dpaa2-eth.c  | 43 ++++++++-----------
 .../net/ethernet/freescale/dpaa2/dpaa2-eth.h  |  1 -
 2 files changed, 18 insertions(+), 26 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
index 19379bae0144..bd43bfcb3126 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -29,16 +29,6 @@ MODULE_LICENSE("Dual BSD/GPL");
 MODULE_AUTHOR("Freescale Semiconductor, Inc");
 MODULE_DESCRIPTION("Freescale DPAA2 Ethernet Driver");
 
-static void *dpaa2_iova_to_virt(struct iommu_domain *domain,
-				dma_addr_t iova_addr)
-{
-	phys_addr_t phys_addr;
-
-	phys_addr = domain ? iommu_iova_to_phys(domain, iova_addr) : iova_addr;
-
-	return phys_to_virt(phys_addr);
-}
-
 static void validate_rx_csum(struct dpaa2_eth_priv *priv,
 			     u32 fd_status,
 			     struct sk_buff *skb)
@@ -85,9 +75,10 @@ static void free_rx_fd(struct dpaa2_eth_priv *priv,
 	sgt = vaddr + dpaa2_fd_get_offset(fd);
 	for (i = 1; i < DPAA2_ETH_MAX_SG_ENTRIES; i++) {
 		addr = dpaa2_sg_get_addr(&sgt[i]);
-		sg_vaddr = dpaa2_iova_to_virt(priv->iommu_domain, addr);
-		dma_unmap_page(dev, addr, DPAA2_ETH_RX_BUF_SIZE,
-			       DMA_BIDIRECTIONAL);
+		sg_vaddr = phys_to_virt
+				(dma_unmap_page_phys(dev, addr,
+						    DPAA2_ETH_RX_BUF_SIZE,
+						    DMA_BIDIRECTIONAL));
 
 		free_pages((unsigned long)sg_vaddr, 0);
 		if (dpaa2_sg_is_final(&sgt[i]))
@@ -143,9 +134,10 @@ static struct sk_buff *build_frag_skb(struct dpaa2_eth_priv *priv,
 
 		/* Get the address and length from the S/G entry */
 		sg_addr = dpaa2_sg_get_addr(sge);
-		sg_vaddr = dpaa2_iova_to_virt(priv->iommu_domain, sg_addr);
-		dma_unmap_page(dev, sg_addr, DPAA2_ETH_RX_BUF_SIZE,
-			       DMA_BIDIRECTIONAL);
+		sg_vaddr = phys_to_virt
+				(dma_unmap_page_phys(dev, sg_addr,
+						    DPAA2_ETH_RX_BUF_SIZE,
+						    DMA_BIDIRECTIONAL));
 
 		sg_length = dpaa2_sg_get_len(sge);
 
@@ -210,9 +202,9 @@ static void free_bufs(struct dpaa2_eth_priv *priv, u64 *buf_array, int count)
 	int i;
 
 	for (i = 0; i < count; i++) {
-		vaddr = dpaa2_iova_to_virt(priv->iommu_domain, buf_array[i]);
-		dma_unmap_page(dev, buf_array[i], DPAA2_ETH_RX_BUF_SIZE,
-			       DMA_BIDIRECTIONAL);
+		vaddr = phys_to_virt(dma_unmap_page_phys(dev, buf_array[i],
+							 DPAA2_ETH_RX_BUF_SIZE,
+							 DMA_BIDIRECTIONAL));
 		free_pages((unsigned long)vaddr, 0);
 	}
 }
@@ -369,9 +361,9 @@ static void dpaa2_eth_rx(struct dpaa2_eth_priv *priv,
 	/* Tracing point */
 	trace_dpaa2_rx_fd(priv->net_dev, fd);
 
-	vaddr = dpaa2_iova_to_virt(priv->iommu_domain, addr);
-	dma_sync_single_for_cpu(dev, addr, DPAA2_ETH_RX_BUF_SIZE,
-				DMA_BIDIRECTIONAL);
+	vaddr = phys_to_virt(dma_sync_single_for_cpu_phys(dev, addr,
+							  DPAA2_ETH_RX_BUF_SIZE,
+							  DMA_BIDIRECTIONAL));
 
 	fas = dpaa2_get_fas(vaddr, false);
 	prefetch(fas);
@@ -682,7 +674,10 @@ static void free_tx_fd(const struct dpaa2_eth_priv *priv,
 	u32 fd_len = dpaa2_fd_get_len(fd);
 
 	fd_addr = dpaa2_fd_get_addr(fd);
-	buffer_start = dpaa2_iova_to_virt(priv->iommu_domain, fd_addr);
+	buffer_start = phys_to_virt
+			(dma_sync_single_for_cpu_phys(dev, fd_addr,
+						      sizeof(*swa),
+						      DMA_BIDIRECTIONAL));
 	swa = (struct dpaa2_eth_swa *)buffer_start;
 
 	if (fd_format == dpaa2_fd_single) {
@@ -3448,8 +3443,6 @@ static int dpaa2_eth_probe(struct fsl_mc_device *dpni_dev)
 	priv = netdev_priv(net_dev);
 	priv->net_dev = net_dev;
 
-	priv->iommu_domain = iommu_get_domain_for_dev(dev);
-
 	/* Obtain a MC portal */
 	err = fsl_mc_portal_allocate(dpni_dev, FSL_MC_IO_ATOMIC_CONTEXT_PORTAL,
 				     &priv->mc_io);
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
index 8a0e65b3267f..4e5183617ebd 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
@@ -374,7 +374,6 @@ struct dpaa2_eth_priv {
 
 	struct fsl_mc_device *dpbp_dev;
 	u16 bpid;
-	struct iommu_domain *iommu_domain;
 
 	bool tx_tstamp; /* Tx timestamping enabled */
 	bool rx_tstamp; /* Rx timestamping enabled */
-- 
2.17.1