From: Alexander Duyck <alexander.h.duyck@intel.com>
To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: Helge Deller <deller@gmx.de>,
brouer@redhat.com, "James E.J. Bottomley" <jejb@parisc-linux.org>,
linux-parisc@vger.kernel.org, davem@davemloft.net
Subject: [net-next PATCH RFC 16/26] arch/parisc: Add option to skip DMA sync as a part of map and unmap
Date: Mon, 24 Oct 2016 08:05:51 -0400 [thread overview]
Message-ID: <20161024120551.16276.97665.stgit@ahduyck-blue-test.jf.intel.com> (raw)
In-Reply-To: <20161024115737.16276.71059.stgit@ahduyck-blue-test.jf.intel.com>
This change allows us to pass DMA_ATTR_SKIP_CPU_SYNC which allows us to
avoid invoking cache line invalidation if the driver will just handle it
via a sync_for_cpu or sync_for_device call.
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-parisc@vger.kernel.org
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
---
arch/parisc/kernel/pci-dma.c | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)
diff --git a/arch/parisc/kernel/pci-dma.c b/arch/parisc/kernel/pci-dma.c
index 02d9ed0..be55ede 100644
--- a/arch/parisc/kernel/pci-dma.c
+++ b/arch/parisc/kernel/pci-dma.c
@@ -459,7 +459,9 @@ static dma_addr_t pa11_dma_map_page(struct device *dev, struct page *page,
void *addr = page_address(page) + offset;
BUG_ON(direction == DMA_NONE);
- flush_kernel_dcache_range((unsigned long) addr, size);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ flush_kernel_dcache_range((unsigned long) addr, size);
+
return virt_to_phys(addr);
}
@@ -469,8 +471,11 @@ static void pa11_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
{
BUG_ON(direction == DMA_NONE);
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ return;
+
if (direction == DMA_TO_DEVICE)
- return;
+ return;
/*
* For PCI_DMA_FROMDEVICE this flush is not necessary for the
@@ -479,7 +484,6 @@ static void pa11_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
*/
flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
- return;
}
static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist,
@@ -496,6 +500,10 @@ static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist,
sg_dma_address(sg) = (dma_addr_t) virt_to_phys(vaddr);
sg_dma_len(sg) = sg->length;
+
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ continue;
+
flush_kernel_dcache_range(vaddr, sg->length);
}
return nents;
@@ -510,14 +518,16 @@ static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
BUG_ON(direction == DMA_NONE);
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ return;
+
if (direction == DMA_TO_DEVICE)
- return;
+ return;
/* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
for_each_sg(sglist, sg, nents, i)
flush_kernel_vmap_range(sg_virt(sg), sg->length);
- return;
}
static void pa11_dma_sync_single_for_cpu(struct device *dev,
--
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next prev parent reply other threads:[~2016-10-24 12:05 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-24 12:04 [net-next PATCH RFC 00/26] Add support for DMA writable pages being writable by the network stack Alexander Duyck
2016-10-24 12:04 ` [net-next PATCH RFC 01/26] swiotlb: Drop unused function swiotlb_map_sg Alexander Duyck
2016-10-24 18:10 ` Konrad Rzeszutek Wilk
2016-10-24 12:04 ` [net-next PATCH RFC 02/26] swiotlb: Add support for DMA_ATTR_SKIP_CPU_SYNC Alexander Duyck
2016-10-24 18:09 ` Konrad Rzeszutek Wilk
2016-10-24 19:16 ` Alexander Duyck
2016-10-25 1:22 ` Konrad Rzeszutek Wilk
2016-10-24 12:04 ` [net-next PATCH RFC 03/26] arch/arc: Add option to skip sync on DMA mapping Alexander Duyck
2016-10-24 12:04 ` [net-next PATCH RFC 04/26] arch/arm: Add option to skip sync on DMA map and unmap Alexander Duyck
2016-10-31 10:20 ` Russell King - ARM Linux
2016-10-31 15:26 ` Alexander Duyck
2016-10-24 12:04 ` [net-next PATCH RFC 05/26] arch/avr32: Add option to skip sync on DMA map Alexander Duyck
2016-10-24 18:27 ` Hans-Christian Noren Egtvedt
2016-10-24 12:04 ` [net-next PATCH RFC 06/26] arch/blackfin: " Alexander Duyck
2016-10-24 12:05 ` [net-next PATCH RFC 07/26] arch/c6x: Add option to skip sync on DMA map and unmap Alexander Duyck
2016-10-28 14:59 ` Mark Salter
2016-10-24 12:05 ` [net-next PATCH RFC 08/26] arch/frv: Add option to skip sync on DMA map Alexander Duyck
2016-10-24 12:05 ` [net-next PATCH RFC 09/26] arch/hexagon: Add option to skip DMA sync as a part of mapping Alexander Duyck
2016-10-24 12:05 ` [net-next PATCH RFC 10/26] arch/m68k: " Alexander Duyck
2016-10-24 12:05 ` [net-next PATCH RFC 11/26] arch/metag: Add option to skip DMA sync as a part of map and unmap Alexander Duyck
2016-10-24 12:05 ` [net-next PATCH RFC 12/26] arch/microblaze: " Alexander Duyck
2016-10-24 12:05 ` [net-next PATCH RFC 13/26] arch/mips: " Alexander Duyck
2016-10-24 12:05 ` [net-next PATCH RFC 14/26] arch/nios2: " Alexander Duyck
2016-10-24 12:05 ` [net-next PATCH RFC 15/26] arch/openrisc: Add option to skip DMA sync as a part of mapping Alexander Duyck
2016-10-24 12:05 ` Alexander Duyck [this message]
2016-10-24 12:05 ` [net-next PATCH RFC 17/26] arch/powerpc: " Alexander Duyck
2016-10-24 12:06 ` [net-next PATCH RFC 18/26] arch/sh: " Alexander Duyck
2016-10-24 12:06 ` [net-next PATCH RFC 19/26] arch/sparc: Add option to skip DMA sync as a part of map and unmap Alexander Duyck
2016-10-24 18:27 ` David Miller
2016-10-24 19:24 ` Alexander Duyck
2016-10-24 12:06 ` [net-next PATCH RFC 20/26] arch/tile: " Alexander Duyck
2016-10-24 12:06 ` [net-next PATCH RFC 21/26] arch/xtensa: Add option to skip DMA sync as a part of mapping Alexander Duyck
2016-10-24 12:06 ` [net-next PATCH RFC 22/26] dma: Add calls for dma_map_page_attrs and dma_unmap_page_attrs Alexander Duyck
2016-10-24 12:06 ` [net-next PATCH RFC 23/26] mm: Add support for releasing multiple instances of a page Alexander Duyck
2016-10-24 12:06 ` [net-next PATCH RFC 24/26] igb: Update driver to make use of DMA_ATTR_SKIP_CPU_SYNC Alexander Duyck
2016-10-24 12:06 ` [net-next PATCH RFC 25/26] igb: Update code to better handle incrementing page count Alexander Duyck
2016-10-24 12:06 ` [net-next PATCH RFC 26/26] igb: Revert "igb: Revert support for build_skb in igb" Alexander Duyck
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