linux-kernel - Re: [PATCH 06/16] iommu/dma: use page allocation function provided by iommu-pages.h

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Message-ID: <d99e0d4a-94a9-482b-b5b5-833cba518b86@arm.com>
Date:   Tue, 28 Nov 2023 22:33:42 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Pasha Tatashin <pasha.tatashin@...een.com>,
        akpm@...ux-foundation.org, alex.williamson@...hat.com,
        alim.akhtar@...sung.com, alyssa@...enzweig.io,
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        heiko@...ech.de, iommu@...ts.linux.dev, jasowang@...hat.com,
        jernej.skrabec@...il.com, jgg@...pe.ca, jonathanh@...dia.com,
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Subject: Re: [PATCH 06/16] iommu/dma: use page allocation function provided by
 iommu-pages.h

On 2023-11-28 8:49 pm, Pasha Tatashin wrote:
> Convert iommu/dma-iommu.c to use the new page allocation functions
> provided in iommu-pages.h.

These have nothing to do with IOMMU pagetables, they are DMA buffers and 
they belong to whoever called the corresponding dma_alloc_* function.

Thanks,
Robin.

> Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
> ---
>   drivers/iommu/dma-iommu.c | 8 +++++---
>   1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index 85163a83df2f..822adad464c2 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -31,6 +31,7 @@
>   #include <linux/vmalloc.h>
>   
>   #include "dma-iommu.h"
> +#include "iommu-pages.h"
>   
>   struct iommu_dma_msi_page {
>   	struct list_head	list;
> @@ -874,7 +875,7 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
>   static void __iommu_dma_free_pages(struct page **pages, int count)
>   {
>   	while (count--)
> -		__free_page(pages[count]);
> +		__iommu_free_page(pages[count]);
>   	kvfree(pages);
>   }
>   
> @@ -912,7 +913,8 @@ static struct page **__iommu_dma_alloc_pages(struct device *dev,
>   			order_size = 1U << order;
>   			if (order_mask > order_size)
>   				alloc_flags |= __GFP_NORETRY;
> -			page = alloc_pages_node(nid, alloc_flags, order);
> +			page = __iommu_alloc_pages_node(nid, alloc_flags,
> +							order);
>   			if (!page)
>   				continue;
>   			if (order)
> @@ -1572,7 +1574,7 @@ static void *iommu_dma_alloc_pages(struct device *dev, size_t size,
>   
>   	page = dma_alloc_contiguous(dev, alloc_size, gfp);
>   	if (!page)
> -		page = alloc_pages_node(node, gfp, get_order(alloc_size));
> +		page = __iommu_alloc_pages_node(node, gfp, get_order(alloc_size));
>   	if (!page)
>   		return NULL;
>