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-rw-r--r--meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0009-swiotlb-ensure-that-page-sized-mappings-are-page-ali.patch38
1 files changed, 38 insertions, 0 deletions
diff --git a/meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0009-swiotlb-ensure-that-page-sized-mappings-are-page-ali.patch b/meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0009-swiotlb-ensure-that-page-sized-mappings-are-page-ali.patch
new file mode 100644
index 0000000..cccc80d
--- /dev/null
+++ b/meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0009-swiotlb-ensure-that-page-sized-mappings-are-page-ali.patch
@@ -0,0 +1,38 @@
+From c92eeec67eb96b79fe3d01b0045789de52fd5af3 Mon Sep 17 00:00:00 2001
+From: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
+Date: Tue, 3 Jan 2017 14:24:58 +0300
+Subject: [PATCH] swiotlb: ensure that page-sized mappings are page-aligned
+
+Some drivers (e.g. nvme) do depend on page mappings to be page
+aligned.
+
+Swiotlb already enforces such alignment for mappings greater than page,
+extend that to page-sized mappings as well.
+
+Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
+---
+ lib/swiotlb.c | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/lib/swiotlb.c b/lib/swiotlb.c
+index 76f29ecba8f4..771234d050c7 100644
+--- a/lib/swiotlb.c
++++ b/lib/swiotlb.c
+@@ -452,11 +452,11 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
+ : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
+
+ /*
+- * For mappings greater than a page, we limit the stride (and
+- * hence alignment) to a page size.
++ * For mappings greater than or equal to a page, we limit the stride
++ * (and hence alignment) to a page size.
+ */
+ nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
+- if (size > PAGE_SIZE)
++ if (size >= PAGE_SIZE)
+ stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT));
+ else
+ stride = 1;
+--
+2.11.0
+