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* [PATCH v3] iommu/amd: Flush not present cache in iommu_map_page
@ 2019-06-13 22:04 Tom Murphy
  2019-07-01 12:16 ` Joerg Roedel
  0 siblings, 1 reply; 2+ messages in thread
From: Tom Murphy @ 2019-06-13 22:04 UTC (permalink / raw)
  To: iommu; +Cc: linux-kernel, Tom Murphy

check if there is a not-present cache present and flush it if there is.

Signed-off-by: Tom Murphy <murphyt7@tcd.ie>
---
v3:
--applied Qian Cai's "iommu/amd: fix a null-ptr-deref in map_sg()" fix

 drivers/iommu/amd_iommu.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index f5d4a0011d25..73740b969e62 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1295,6 +1295,16 @@ static void domain_flush_complete(struct protection_domain *domain)
 	}
 }
 
+/* Flush the not present cache if it exists */
+static void domain_flush_np_cache(struct protection_domain *domain,
+		dma_addr_t iova, size_t size)
+{
+	if (unlikely(amd_iommu_np_cache)) {
+		domain_flush_pages(domain, iova, size);
+		domain_flush_complete(domain);
+	}
+}
+
 
 /*
  * This function flushes the DTEs for all devices in domain
@@ -2377,10 +2387,7 @@ static dma_addr_t __map_single(struct device *dev,
 	}
 	address += offset;
 
-	if (unlikely(amd_iommu_np_cache)) {
-		domain_flush_pages(&dma_dom->domain, address, size);
-		domain_flush_complete(&dma_dom->domain);
-	}
+	domain_flush_np_cache(&dma_dom->domain, address, size);
 
 out:
 	return address;
@@ -2559,6 +2566,9 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
 		s->dma_length   = s->length;
 	}
 
+	if (s)
+		domain_flush_np_cache(domain, s->dma_address, s->dma_length);
+
 	return nelems;
 
 out_unmap:
@@ -3039,6 +3049,8 @@ static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
 	ret = iommu_map_page(domain, iova, paddr, page_size, prot, GFP_KERNEL);
 	mutex_unlock(&domain->api_lock);
 
+	domain_flush_np_cache(domain, iova, page_size);
+
 	return ret;
 }
 
-- 
2.20.1

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^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH v3] iommu/amd: Flush not present cache in iommu_map_page
  2019-06-13 22:04 [PATCH v3] iommu/amd: Flush not present cache in iommu_map_page Tom Murphy
@ 2019-07-01 12:16 ` Joerg Roedel
  0 siblings, 0 replies; 2+ messages in thread
From: Joerg Roedel @ 2019-07-01 12:16 UTC (permalink / raw)
  To: Tom Murphy; +Cc: iommu, linux-kernel

On Thu, Jun 13, 2019 at 11:04:55PM +0100, Tom Murphy wrote:
>  drivers/iommu/amd_iommu.c | 20 ++++++++++++++++----
>  1 file changed, 16 insertions(+), 4 deletions(-)

Applied, thanks.
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2019-06-13 22:04 [PATCH v3] iommu/amd: Flush not present cache in iommu_map_page Tom Murphy
2019-07-01 12:16 ` Joerg Roedel

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