linux-kernel - [PATCH v2] iommu/dma: Use NUMA aware memory allocations in __iommu_dma_alloc

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Date:   Tue, 20 Nov 2018 21:42:00 +0800
From:   John Garry <john.garry@...wei.com>
To:     <joro@...tes.org>
CC:     <robin.murphy@....com>, <will.deacon@....com>,
        <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <ganapatrao.kulkarni@...ium.com>, <hch@....de>,
        <m.szyprowski@...sung.com>, John Garry <john.garry@...wei.com>
Subject: [PATCH v2] iommu/dma: Use NUMA aware memory allocations in __iommu_dma_alloc_pages()

From: Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>

Change function __iommu_dma_alloc_pages() to allocate memory/pages
for DMA from respective device NUMA node.

Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>
[JPG:  Modifed to use kvzalloc() and fixed indentation]
Signed-off-by: John Garry <john.garry@...wei.com>
---
Difference v1->v2:
- Add Ganapatrao's tag and change author

This patch was originally posted by Ganapatrao in [1].

However, after initial review, it was never reposted (due to lack of
cycles, I think). In addition, the functionality in its sibling patches
were merged through patches, as mentioned in [2]; this also refers to a
discussion on device local allocations vs CPU local allocations for DMA
pool, and which is better [3].

However, as mentioned in [3], dma_alloc_coherent() uses the locality
information from the device - as in direct DMA - so this patch is just
applying this same policy.

[1] https://lore.kernel.org/patchwork/patch/833004/
[2] https://lkml.org/lkml/2018/8/22/391
[3] https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1692998.html


diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index d1b0475..ada00bc 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -449,20 +449,17 @@ static void __iommu_dma_free_pages(struct page **pages, int count)
 	kvfree(pages);
 }
 
-static struct page **__iommu_dma_alloc_pages(unsigned int count,
-		unsigned long order_mask, gfp_t gfp)
+static struct page **__iommu_dma_alloc_pages(struct device *dev,
+		unsigned int count, unsigned long order_mask, gfp_t gfp)
 {
 	struct page **pages;
-	unsigned int i = 0, array_size = count * sizeof(*pages);
+	unsigned int i = 0, nid = dev_to_node(dev);
 
 	order_mask &= (2U << MAX_ORDER) - 1;
 	if (!order_mask)
 		return NULL;
 
-	if (array_size <= PAGE_SIZE)
-		pages = kzalloc(array_size, GFP_KERNEL);
-	else
-		pages = vzalloc(array_size);
+	pages = kvzalloc_node(count * sizeof(*pages), GFP_KERNEL, nid);
 	if (!pages)
 		return NULL;
 
@@ -483,8 +480,10 @@ static struct page **__iommu_dma_alloc_pages(unsigned int count,
 			unsigned int order = __fls(order_mask);
 
 			order_size = 1U << order;
-			page = alloc_pages((order_mask - order_size) ?
-					   gfp | __GFP_NORETRY : gfp, order);
+			page = alloc_pages_node(nid,
+						(order_mask - order_size) ?
+						gfp | __GFP_NORETRY : gfp,
+						order);
 			if (!page)
 				continue;
 			if (!order)
@@ -569,7 +568,8 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
 		alloc_sizes = min_size;
 
 	count = PAGE_ALIGN(size) >> PAGE_SHIFT;
-	pages = __iommu_dma_alloc_pages(count, alloc_sizes >> PAGE_SHIFT, gfp);
+	pages = __iommu_dma_alloc_pages(dev, count, alloc_sizes >> PAGE_SHIFT,
+					gfp);
 	if (!pages)
 		return NULL;
 
-- 
1.9.1