[PATCH v6 07/19] arc: mm: Convert to GENERIC_IOREMAP

Baoquan He
2023-06-09T07:58:41Z

By taking GENERIC_IOREMAP method, the generic generic_ioremap_prot(),
generic_iounmap(), and their generic wrapper ioremap_prot(), ioremap()
and iounmap() are all visible and available to arch. Arch needs to
provide wrapper functions to override the generic versions if there's
arch specific handling in its ioremap_prot(), ioremap() or iounmap().
This change will simplify implementation by removing duplicated codes
with generic_ioremap_prot() and generic_iounmap(), and has the equivalent
functioality as before.

Here, add wrapper functions ioremap_prot() and iounmap() for arc's
special operation when ioremap_prot() and iounmap().

Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Vineet Gupta <vgupta@kernel.org>
Cc: linux-snps-arc@lists.infradead.org
---
arch/arc/Kconfig | 1 +
arch/arc/include/asm/io.h | 7 +++---
arch/arc/mm/ioremap.c | 49 ++++-----------------------------------
3 files changed, 8 insertions(+), 49 deletions(-)

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index ab6d701365bb..3a666ee0c0bc 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -26,6 +26,7 @@ config ARC
select GENERIC_PENDING_IRQ if SMP
select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
+ select GENERIC_IOREMAP
select HAVE_ARCH_KGDB
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARC_MMU_V4
diff --git a/arch/arc/include/asm/io.h b/arch/arc/include/asm/io.h
index 80347382a380..4fdb7350636c 100644
--- a/arch/arc/include/asm/io.h
+++ b/arch/arc/include/asm/io.h
@@ -21,8 +21,9 @@
#endif

extern void __iomem *ioremap(phys_addr_t paddr, unsigned long size);
-extern void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
- unsigned long flags);
+#define ioremap ioremap
+#define ioremap_prot ioremap_prot
+#define iounmap iounmap
static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
return (void __iomem *)port;
@@ -32,8 +33,6 @@ static inline void ioport_unmap(void __iomem *addr)
{
}

-extern void iounmap(const volatile void __iomem *addr);
-
/*
* io{read,write}{16,32}be() macros
*/
diff --git a/arch/arc/mm/ioremap.c b/arch/arc/mm/ioremap.c
index 712c2311daef..b07004d53267 100644
--- a/arch/arc/mm/ioremap.c
+++ b/arch/arc/mm/ioremap.c
@@ -8,7 +8,6 @@
#include <linux/module.h>
#include <linux/io.h>
#include <linux/mm.h>
-#include <linux/slab.h>
#include <linux/cache.h>

static inline bool arc_uncached_addr_space(phys_addr_t paddr)
@@ -25,13 +24,6 @@ static inline bool arc_uncached_addr_space(phys_addr_t paddr)

void __iomem *ioremap(phys_addr_t paddr, unsigned long size)
{
- phys_addr_t end;
-
- /* Don't allow wraparound or zero size */
- end = paddr + size - 1;
- if (!size || (end < paddr))
- return NULL;
-
/*
* If the region is h/w uncached, MMU mapping can be elided as optim
* The cast to u32 is fine as this region can only be inside 4GB
@@ -51,55 +43,22 @@ EXPORT_SYMBOL(ioremap);
* ARC hardware uncached region, this one still goes thru the MMU as caller
* might need finer access control (R/W/X)
*/
-void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
+void __iomem *ioremap_prot(phys_addr_t paddr, size_t size,
unsigned long flags)
{
- unsigned int off;
- unsigned long vaddr;
- struct vm_struct *area;
- phys_addr_t end;
pgprot_t prot = __pgprot(flags);

- /* Don't allow wraparound, zero size */
- end = paddr + size - 1;
- if ((!size) || (end < paddr))
- return NULL;
-
- /* An early platform driver might end up here */
- if (!slab_is_available())
- return NULL;
-
/* force uncached */
- prot = pgprot_noncached(prot);
-
- /* Mappings have to be page-aligned */
- off = paddr & ~PAGE_MASK;
- paddr &= PAGE_MASK_PHYS;
- size = PAGE_ALIGN(end + 1) - paddr;
-
- /*
- * Ok, go for it..
- */
- area = get_vm_area(size, VM_IOREMAP);
- if (!area)
- return NULL;
- area->phys_addr = paddr;
- vaddr = (unsigned long)area->addr;
- if (ioremap_page_range(vaddr, vaddr + size, paddr, prot)) {
- vunmap((void __force *)vaddr);
- return NULL;
- }
- return (void __iomem *)(off + (char __iomem *)vaddr);
+ return generic_ioremap_prot(paddr, size, pgprot_noncached(prot));
}
EXPORT_SYMBOL(ioremap_prot);

-
-void iounmap(const volatile void __iomem *addr)
+void iounmap(volatile void __iomem *addr)
{
/* weird double cast to handle phys_addr_t > 32 bits */
if (arc_uncached_addr_space((phys_addr_t)(u32)addr))
return;

- vfree((void *)(PAGE_MASK & (unsigned long __force)addr));
+ generic_iounmap(addr);
}
EXPORT_SYMBOL(iounmap);
--
2.34.1