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From: David Stevens <stevensd@chromium.org>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Christoph Hellwig <hch@lst.de>, Joerg Roedel <joro@8bytes.org>,
	Will Deacon <will@kernel.org>,
	Sergey Senozhatsky <senozhatsky@chromium.org>,
	Lu Baolu <baolu.lu@linux.intel.com>,
	iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
	David Stevens <stevensd@chromium.org>
Subject: [PATCH v2 9/9] drm/i915: use DMA_ATTR_PERSISTENT_STREAMING flag
Date: Fri,  6 Aug 2021 19:34:23 +0900	[thread overview]
Message-ID: <20210806103423.3341285-10-stevensd@google.com> (raw)
In-Reply-To: <20210806103423.3341285-1-stevensd@google.com>

From: David Stevens <stevensd@chromium.org>

Use the new DMA_ATTR_PERSISTENT_STREAMING for long lived dma mappings
which directly handle CPU cache coherency instead of using dma_sync_*.

Signed-off-by: David Stevens <stevensd@chromium.org>
---
 drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 4 +++-
 drivers/gpu/drm/i915/i915_gem_gtt.c        | 3 ++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
index 616c3a2f1baf..df982cfb4f34 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
@@ -48,7 +48,9 @@ static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachme
 		src = sg_next(src);
 	}
 
-	ret = dma_map_sgtable(attachment->dev, st, dir, DMA_ATTR_SKIP_CPU_SYNC);
+	ret = dma_map_sgtable(attachment->dev, st, dir,
+			      DMA_ATTR_SKIP_CPU_SYNC |
+			      DMA_ATTR_PERSISTENT_STREAMING);
 	if (ret)
 		goto err_free_sg;
 
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 36489be4896b..f27a849631f7 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -33,7 +33,8 @@ int i915_gem_gtt_prepare_pages(struct drm_i915_gem_object *obj,
 				     PCI_DMA_BIDIRECTIONAL,
 				     DMA_ATTR_SKIP_CPU_SYNC |
 				     DMA_ATTR_NO_KERNEL_MAPPING |
-				     DMA_ATTR_NO_WARN))
+				     DMA_ATTR_NO_WARN |
+				     DMA_ATTR_PERSISTENT_STREAMING))
 			return 0;
 
 		/*
-- 
2.32.0.605.g8dce9f2422-goog


  parent reply	other threads:[~2021-08-06 10:35 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-06 10:34 [PATCH v2 0/9] Add dynamic iommu backed bounce buffers David Stevens
2021-08-06 10:34 ` [PATCH v2 1/9] Revert "iommu: Allow the dma-iommu api to use bounce buffers" David Stevens
2021-08-06 10:34 ` [PATCH v2 2/9] dma-iommu: expose a few helper functions to module David Stevens
2021-08-06 17:28   ` kernel test robot
2021-08-06 10:34 ` [PATCH v2 3/9] dma-iommu: bounce buffers for untrusted devices David Stevens
2021-08-06 15:53   ` kernel test robot
2021-08-10  1:19   ` Mi, Dapeng1
2021-08-10  1:41     ` David Stevens
2021-08-06 10:34 ` [PATCH v2 4/9] dma-iommu: remove extra buffer search on unmap David Stevens
2021-08-06 10:34 ` [PATCH v2 5/9] dma-iommu: clear only necessary bytes David Stevens
2021-08-06 10:34 ` [PATCH v2 6/9] dma-iommu: add bounce buffer pools David Stevens
2021-08-06 10:34 ` [PATCH v2 7/9] dma-iommu: support iommu bounce buffer optimization David Stevens
2021-08-06 10:34 ` [PATCH v2 8/9] dma-mapping: add persistent streaming mapping flag David Stevens
2021-08-06 10:34 ` David Stevens [this message]
2022-05-24 12:27 ` [PATCH v2 0/9] Add dynamic iommu backed bounce buffers Niklas Schnelle
2022-05-27  1:25   ` David Stevens
2022-06-03 14:53     ` Niklas Schnelle
2022-06-06  1:24       ` David Stevens
2022-07-01  9:23     ` Niklas Schnelle

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