linux-kernel - [PATCH 02/11] mm: ioremap: fixup the physical address

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Date:   Mon,  1 Aug 2022 22:40:20 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org, hch@...radead.org,
        wangkefeng.wang@...wei.com, linux-arm-kernel@...ts.infradead.org,
        Baoquan He <bhe@...hat.com>
Subject: [PATCH 02/11] mm: ioremap: fixup the physical address

In some architectures, the io address will be fixed up before doing
mapping, e.g, parisc, mips.

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

This is a preparation patch, no functionality change.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 arch/arm64/include/asm/io.h |  3 ++-
 arch/arm64/mm/ioremap.c     | 10 ++++++++--
 include/asm-generic/io.h    |  6 +++---
 mm/ioremap.c                | 19 ++++++++++---------
 4 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index 9c56a077b687..7f0c5f60d946 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -164,7 +164,8 @@ extern void __memset_io(volatile void __iomem *, int, size_t);
  * I/O memory mapping functions.
  */
 
-void __iomem *ioremap_allowed(phys_addr_t phys_addr, size_t size, unsigned long prot);
+void __iomem *
+ioremap_allowed(phys_addr_t *paddr, size_t size, unsigned long *prot_val);
 #define ioremap_allowed ioremap_allowed
 
 #define _PAGE_IOREMAP PROT_DEVICE_nGnRE
diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c
index 49467c781283..b9febcf0f5f4 100644
--- a/arch/arm64/mm/ioremap.c
+++ b/arch/arm64/mm/ioremap.c
@@ -3,11 +3,17 @@
 #include <linux/mm.h>
 #include <linux/io.h>
 
-void __iomem *ioremap_allowed(phys_addr_t phys_addr, size_t size, unsigned long prot)
+void __iomem *
+ioremap_allowed(phys_addr_t *paddr, size_t size, unsigned long *prot_val)
 {
-	unsigned long last_addr = phys_addr + size - 1;
+	unsigned long last_addr, offset, phys_addr = *paddr;
 	int ret = -EINVAL;
 
+	offset = phys_addr & (~PAGE_MASK);
+	phys_addr -= offset;
+	size = PAGE_ALIGN(size + offset);
+	last_addr = phys_addr + size - 1;
+
 	/* Don't allow outside PHYS_MASK */
 	if (last_addr & ~PHYS_MASK)
 		return IOMEM_ERR_PTR(ret);
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index d72eb310fb3c..0b5cd3cef99d 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -976,8 +976,8 @@ static inline void iounmap(volatile void __iomem *addr)
  */
 #ifndef ioremap_allowed
 #define ioremap_allowed ioremap_allowed
-static inline void __iomem *ioremap_allowed(phys_addr_t phys_addr, size_t size,
-				   unsigned long prot)
+static inline void __iomem *ioremap_allowed(phys_addr_t *paddr, size_t size,
+				   unsigned long *prot_val)
 {
 	return NULL;
 }
@@ -991,7 +991,7 @@ static inline int iounmap_allowed(void *addr)
 }
 #endif
 
-void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
+void __iomem *ioremap_prot(phys_addr_t paddr, size_t size,
 			   unsigned long prot);
 void iounmap(volatile void __iomem *addr);
 
diff --git a/mm/ioremap.c b/mm/ioremap.c
index b16ee9debea2..01439882112e 100644
--- a/mm/ioremap.c
+++ b/mm/ioremap.c
@@ -11,13 +11,20 @@
 #include <linux/io.h>
 #include <linux/export.h>
 
-void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
+void __iomem *ioremap_prot(phys_addr_t paddr, size_t size,
 			   unsigned long prot)
 {
 	unsigned long offset, vaddr;
-	phys_addr_t last_addr;
+	phys_addr_t last_addr, phys_addr = paddr;
 	struct vm_struct *area;
 	void __iomem *base;
+	unsigned long prot_val = prot;
+
+	base = ioremap_allowed(&phys_addr, size, &prot_val);
+	if (IS_ERR(base))
+		return NULL;
+	else if (base)
+		return base;
 
 	/* Disallow wrap-around or zero size */
 	last_addr = phys_addr + size - 1;
@@ -29,12 +36,6 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
 	phys_addr -= offset;
 	size = PAGE_ALIGN(size + offset);
 
-	base = ioremap_allowed(phys_addr, size, prot);
-	if (IS_ERR(base))
-		return NULL;
-	else if (base)
-		return base;
-
 	area = get_vm_area_caller(size, VM_IOREMAP,
 			__builtin_return_address(0));
 	if (!area)
@@ -43,7 +44,7 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
 	area->phys_addr = phys_addr;
 
 	if (ioremap_page_range(vaddr, vaddr + size, phys_addr,
-			       __pgprot(prot))) {
+			       __pgprot(prot_val))) {
 		free_vm_area(area);
 		return NULL;
 	}
-- 
2.34.1