[PATCH v6 04/19] mm/ioremap: Define generic_ioremap_prot() and generic_iounmap()

Baoquan He
2023-06-09T07:56:18Z

From: Christophe Leroy <christophe.leroy@csgroup.eu>

Define a generic version of ioremap_prot() and iounmap() that
architectures can call after they have performed the necessary
alteration to parameters and/or necessary verifications.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
---
include/asm-generic/io.h | 4 ++++
mm/ioremap.c | 22 ++++++++++++++++------
2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 587e7e9b9a37..a7ca2099ba19 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -1073,9 +1073,13 @@ static inline bool iounmap_allowed(void *addr)
}
#endif

+void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
+ pgprot_t prot);
+
void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
unsigned long prot);
void iounmap(volatile void __iomem *addr);
+void generic_iounmap(volatile void __iomem *addr);

static inline void __iomem *ioremap(phys_addr_t addr, size_t size)
{
diff --git a/mm/ioremap.c b/mm/ioremap.c
index 8652426282cc..db6234b9db59 100644
--- a/mm/ioremap.c
+++ b/mm/ioremap.c
@@ -11,8 +11,8 @@
#include <linux/io.h>
#include <linux/export.h>

-void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
- unsigned long prot)
+void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
+ pgprot_t prot)
{
unsigned long offset, vaddr;
phys_addr_t last_addr;
@@ -28,7 +28,7 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
phys_addr -= offset;
size = PAGE_ALIGN(size + offset);

- if (!ioremap_allowed(phys_addr, size, prot))
+ if (!ioremap_allowed(phys_addr, size, pgprot_val(prot)))
return NULL;

area = get_vm_area_caller(size, VM_IOREMAP,
@@ -38,17 +38,22 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
vaddr = (unsigned long)area->addr;
area->phys_addr = phys_addr;

- if (ioremap_page_range(vaddr, vaddr + size, phys_addr,
- __pgprot(prot))) {
+ if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) {
free_vm_area(area);
return NULL;
}

return (void __iomem *)(vaddr + offset);
}
+
+void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
+ unsigned long prot)
+{
+ return generic_ioremap_prot(phys_addr, size, __pgprot(prot));
+}
EXPORT_SYMBOL(ioremap_prot);

-void iounmap(volatile void __iomem *addr)
+void generic_iounmap(volatile void __iomem *addr)
{
void *vaddr = (void *)((unsigned long)addr & PAGE_MASK);

@@ -58,4 +63,9 @@ void iounmap(volatile void __iomem *addr)
if (is_vmalloc_addr(vaddr))
vunmap(vaddr);
}
+
+void iounmap(volatile void __iomem *addr)
+{
+ generic_iounmap(addr);
+}
EXPORT_SYMBOL(iounmap);
--
2.34.1