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From: Christoph Hellwig <hch@lst.de>
To: "Björn Töpel" <bjorn.topel@intel.com>
Cc: Magnus Karlsson <magnus.karlsson@intel.com>,
	Jonathan Lemon <jonathan.lemon@gmail.com>,
	iommu@lists.linux-foundation.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 4/4] xsk: use dma_need_sync instead of reimplenting it
Date: Mon, 29 Jun 2020 15:03:59 +0200
Message-ID: <20200629130359.2690853-5-hch@lst.de> (raw)
In-Reply-To: <20200629130359.2690853-1-hch@lst.de>

Use the dma_need_sync helper instead of (not always entirely correctly)
poking into the dma-mapping internals.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 net/xdp/xsk_buff_pool.c | 50 +++--------------------------------------
 1 file changed, 3 insertions(+), 47 deletions(-)

diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
index 6733e2c59e4835..08b80669f64955 100644
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -2,9 +2,6 @@
 
 #include <net/xsk_buff_pool.h>
 #include <net/xdp_sock.h>
-#include <linux/dma-direct.h>
-#include <linux/dma-noncoherent.h>
-#include <linux/swiotlb.h>
 
 #include "xsk_queue.h"
 
@@ -124,48 +121,6 @@ static void xp_check_dma_contiguity(struct xsk_buff_pool *pool)
 	}
 }
 
-static bool __maybe_unused xp_check_swiotlb_dma(struct xsk_buff_pool *pool)
-{
-#if defined(CONFIG_SWIOTLB)
-	phys_addr_t paddr;
-	u32 i;
-
-	for (i = 0; i < pool->dma_pages_cnt; i++) {
-		paddr = dma_to_phys(pool->dev, pool->dma_pages[i]);
-		if (is_swiotlb_buffer(paddr))
-			return false;
-	}
-#endif
-	return true;
-}
-
-static bool xp_check_cheap_dma(struct xsk_buff_pool *pool)
-{
-#if defined(CONFIG_HAS_DMA)
-	const struct dma_map_ops *ops = get_dma_ops(pool->dev);
-
-	if (ops) {
-		return !ops->sync_single_for_cpu &&
-			!ops->sync_single_for_device;
-	}
-
-	if (!dma_is_direct(ops))
-		return false;
-
-	if (!xp_check_swiotlb_dma(pool))
-		return false;
-
-	if (!dev_is_dma_coherent(pool->dev)) {
-#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) ||		\
-	defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) ||	\
-	defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE)
-		return false;
-#endif
-	}
-#endif
-	return true;
-}
-
 int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
 	       unsigned long attrs, struct page **pages, u32 nr_pages)
 {
@@ -179,6 +134,7 @@ int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
 
 	pool->dev = dev;
 	pool->dma_pages_cnt = nr_pages;
+	pool->dma_need_sync = false;
 
 	for (i = 0; i < pool->dma_pages_cnt; i++) {
 		dma = dma_map_page_attrs(dev, pages[i], 0, PAGE_SIZE,
@@ -187,13 +143,13 @@ int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
 			xp_dma_unmap(pool, attrs);
 			return -ENOMEM;
 		}
+		if (dma_need_sync(dev, dma))
+			pool->dma_need_sync = true;
 		pool->dma_pages[i] = dma;
 	}
 
 	if (pool->unaligned)
 		xp_check_dma_contiguity(pool);
-
-	pool->dma_need_sync = !xp_check_cheap_dma(pool);
 	return 0;
 }
 EXPORT_SYMBOL(xp_dma_map);
-- 
2.26.2


  parent reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-29 13:03 add an API to check if a streamming mapping needs sync calls Christoph Hellwig
2020-06-29 13:03 ` [PATCH 1/4] dma-mapping: add a new dma_need_sync API Christoph Hellwig
2020-07-06 19:42   ` Jonathan Lemon
2020-07-07  6:47     ` Christoph Hellwig
2020-07-07 15:11       ` Jonathan Lemon
2020-07-07 15:14         ` Christoph Hellwig
2020-06-29 13:03 ` [PATCH 2/4] xsk: replace the cheap_dma flag with a dma_need_sync flag Christoph Hellwig
2020-06-29 13:03 ` [PATCH 3/4] xsk: remove a double pool->dev assignment in xp_dma_map Christoph Hellwig
2020-06-29 13:03 ` Christoph Hellwig [this message]
2020-06-29 13:39 ` add an API to check if a streamming mapping needs sync calls Björn Töpel
2020-06-29 14:22   ` Christoph Hellwig
2020-07-08  7:44   ` Christoph Hellwig
2020-07-08  9:01     ` Daniel Borkmann

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