linux-kernel - [PATCH v4 08/14] mm: introduce io_remap_pfn_range

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Message-ID: <cb6c0222fefba19d4dddd2c9a35aa0b6d7ab3a6e.1758135681.git.lorenzo.stoakes@oracle.com>
Date: Wed, 17 Sep 2025 20:11:10 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jonathan Corbet <corbet@....net>, Matthew Wilcox <willy@...radead.org>,
        Guo Ren <guoren@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
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        Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>
Subject: [PATCH v4 08/14] mm: introduce io_remap_pfn_range_[prepare, complete]()

We introduce the io_remap*() equivalents of remap_pfn_range_prepare() and
remap_pfn_range_complete() to allow for I/O remapping via mmap_prepare.

Make these internal to mm, as they should only be used by internal helpers.

Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
---
 mm/internal.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/mm/internal.h b/mm/internal.h
index c6655f76cf69..085e34f84bae 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1657,4 +1657,22 @@ void remap_pfn_range_prepare(struct vm_area_desc *desc, unsigned long pfn);
 int remap_pfn_range_complete(struct vm_area_struct *vma, unsigned long addr,
 		unsigned long pfn, unsigned long size, pgprot_t pgprot);
 
+static inline void io_remap_pfn_range_prepare(struct vm_area_desc *desc,
+		unsigned long orig_pfn, unsigned long size)
+{
+	const unsigned long pfn = io_remap_pfn_range_pfn(orig_pfn, size);
+
+	return remap_pfn_range_prepare(desc, pfn);
+}
+
+static inline int io_remap_pfn_range_complete(struct vm_area_struct *vma,
+		unsigned long addr, unsigned long orig_pfn, unsigned long size,
+		pgprot_t orig_prot)
+{
+	const unsigned long pfn = io_remap_pfn_range_pfn(orig_pfn, size);
+	const pgprot_t prot = io_remap_pfn_range_prot(orig_prot);
+
+	return remap_pfn_range_complete(vma, addr, pfn, size, prot);
+}
+
 #endif	/* __MM_INTERNAL_H */
-- 
2.51.0