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From:   Baoquan He <bhe@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     linux-mm@kvack.org, akpm@linux-foundation.org, hch@infradead.org,
        agordeev@linux.ibm.com, wangkefeng.wang@huawei.com,
        linux-arm-kernel@lists.infradead.org, Baoquan He <bhe@redhat.com>
Subject: [PATCH v2 02/11] mm: ioremap: fixup the physical address and page prot
Date:   Sat, 20 Aug 2022 08:31:16 +0800
Message-Id: <20220820003125.353570-3-bhe@redhat.com>
In-Reply-To: <20220820003125.353570-1-bhe@redhat.com>
References: <20220820003125.353570-1-bhe@redhat.com>
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On some architectures, the physical address need be fixed up before
doing mapping, e.g, parisc. And on architectures, e.g arc, the
parameter 'prot' passed into ioremap_prot() need be adjusted too.

In oder to convert them to take GENERIC_IOREMAP method, we need wrap
the address fixing up code and page prot adjusting code into arch_ioremap()
and pass the new address and 'prot' out for ioremap_prot() handling.

This is a preparation patch, no functionality change.

Signed-off-by: Baoquan He <bhe@redhat.com>
---
 arch/arm64/include/asm/io.h | 3 ++-
 arch/arm64/mm/ioremap.c     | 5 +++--
 include/asm-generic/io.h    | 4 ++--
 mm/ioremap.c                | 2 +-
 4 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index dd7e1c2dc86c..6a5578ddbbf6 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -139,7 +139,8 @@ extern void __memset_io(volatile void __iomem *, int, size_t);
  * I/O memory mapping functions.
  */
 
-void __iomem *arch_ioremap(phys_addr_t phys_addr, size_t size, unsigned long prot);
+void __iomem *
+arch_ioremap(phys_addr_t *paddr, size_t size, unsigned long *prot_val);
 #define arch_ioremap arch_ioremap
 
 #define _PAGE_IOREMAP PROT_DEVICE_nGnRE
diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c
index b0f4cea86f0e..ef75ffef4dbc 100644
--- a/arch/arm64/mm/ioremap.c
+++ b/arch/arm64/mm/ioremap.c
@@ -3,9 +3,10 @@
 #include <linux/mm.h>
 #include <linux/io.h>
 
-void __iomem *arch_ioremap(phys_addr_t phys_addr, size_t size, unsigned long prot)
+void __iomem *
+arch_ioremap(phys_addr_t *paddr, size_t size, unsigned long *prot_val)
 {
-	unsigned long last_addr, offset;
+	unsigned long last_addr, offset, phys_addr = *paddr;
 
 	offset = phys_addr & (~PAGE_MASK);
 	phys_addr -= offset;
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 7b6bfb62ef80..fb9bda2be8ed 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -1059,8 +1059,8 @@ static inline void iounmap(volatile void __iomem *addr)
  */
 #ifndef arch_ioremap
 #define arch_ioremap arch_ioremap
-static inline void __iomem *arch_ioremap(phys_addr_t phys_addr, size_t size,
-				   unsigned long prot)
+static inline void __iomem *arch_ioremap(phys_addr_t *paddr, size_t size,
+				   unsigned long *prot_val)
 {
 	return NULL;
 }
diff --git a/mm/ioremap.c b/mm/ioremap.c
index 99fde69becc7..7914b5cf5b78 100644
--- a/mm/ioremap.c
+++ b/mm/ioremap.c
@@ -19,7 +19,7 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
 	struct vm_struct *area;
 	void __iomem *ioaddr;
 
-	ioaddr = arch_ioremap(phys_addr, size, prot);
+	ioaddr = arch_ioremap(&phys_addr, size, &prot);
 	if (IS_ERR(ioaddr))
 		return NULL;
 	else if (ioaddr)
-- 
2.34.1