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Subject[PATCH v4 5/6] arm64: mm: Convert to GENERIC_IOREMAP
Date
Add hook for arm64's special operation when ioremap() and iounmap(),
then ioremap_wc/np/cache is converted to use ioremap_prot()
from GENERIC_IOREMAP, update the Copyright and kill the unused
inclusions.

Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/io.h | 20 ++++++---
arch/arm64/kernel/acpi.c | 2 +-
arch/arm64/mm/ioremap.c | 84 +++++--------------------------------
4 files changed, 26 insertions(+), 81 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 1652a9800ebe..ac160aa26126 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -126,6 +126,7 @@ config ARM64
select GENERIC_CPU_VULNERABILITIES
select GENERIC_EARLY_IOREMAP
select GENERIC_IDLE_POLL_SETUP
+ select GENERIC_IOREMAP
select GENERIC_IRQ_IPI
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index 3995652daf81..02aa5a5e9190 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -163,13 +163,21 @@ extern void __memset_io(volatile void __iomem *, int, size_t);
/*
* I/O memory mapping functions.
*/
-extern void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot);
-extern void iounmap(volatile void __iomem *addr);
-extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size);

-#define ioremap(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))
-#define ioremap_wc(addr, size) __ioremap((addr), (size), __pgprot(PROT_NORMAL_NC))
-#define ioremap_np(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRnE))
+int ioremap_allowed(phys_addr_t phys_addr, size_t size, unsigned long prot);
+#define ioremap_allowed ioremap_allowed
+
+int iounmap_allowed(void __iomem *addr);
+#define iounmap_allowed iounmap_allowed
+
+#define _PAGE_IOREMAP PROT_DEVICE_nGnRE
+
+#define ioremap_wc(addr, size) ioremap_prot((addr), (size), PROT_NORMAL_NC)
+#define ioremap_np(addr, size) ioremap_prot((addr), (size), PROT_DEVICE_nGnRnE)
+#define ioremap_cache(addr, size) ({ \
+ pfn_is_map_memory(__phys_to_pfn(addr)) ? \
+ (void __iomem *)__phys_to_virt(addr) : ioremap_prot(addr, size, PROT_NORMAL); \
+})

/*
* io{read,write}{16,32,64}be() macros
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index e4dea8db6924..a5a256e3f9fe 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -351,7 +351,7 @@ void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
prot = __acpi_get_writethrough_mem_attribute();
}
}
- return __ioremap(phys, size, prot);
+ return ioremap_prot(phys, size, pgprot_val(prot));
}

/*
diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c
index b21f91cd830d..4a3f526c6057 100644
--- a/arch/arm64/mm/ioremap.c
+++ b/arch/arm64/mm/ioremap.c
@@ -1,96 +1,32 @@
// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Based on arch/arm/mm/ioremap.c
- *
- * (C) Copyright 1995 1996 Linus Torvalds
- * Hacked for ARM by Phil Blundell <philb@gnu.org>
- * Hacked to allow all architectures to build, and various cleanups
- * by Russell King
- * Copyright (C) 2012 ARM Ltd.
- */

-#include <linux/export.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/io.h>

-#include <asm/fixmap.h>
-#include <asm/tlbflush.h>
-
-static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size,
- pgprot_t prot, void *caller)
+int ioremap_allowed(phys_addr_t phys_addr, size_t size, unsigned long prot)
{
- unsigned long last_addr;
- unsigned long offset = phys_addr & ~PAGE_MASK;
- int err;
- unsigned long addr;
- struct vm_struct *area;
-
- /*
- * Page align the mapping address and size, taking account of any
- * offset.
- */
- phys_addr &= PAGE_MASK;
- size = PAGE_ALIGN(size + offset);
+ unsigned long last_addr = phys_addr + size - 1;

- /*
- * Don't allow wraparound, zero size or outside PHYS_MASK.
- */
- last_addr = phys_addr + size - 1;
- if (!size || last_addr < phys_addr || (last_addr & ~PHYS_MASK))
- return NULL;
+ /* Don't allow outside PHYS_MASK */
+ if (last_addr & ~PHYS_MASK)
+ return -EINVAL;

- /*
- * Don't allow RAM to be mapped.
- */
+ /* Don't allow RAM to be mapped. */
if (WARN_ON(pfn_is_map_memory(__phys_to_pfn(phys_addr))))
- return NULL;
+ return -EINVAL;

- area = get_vm_area_caller(size, VM_IOREMAP, caller);
- if (!area)
- return NULL;
- addr = (unsigned long)area->addr;
- area->phys_addr = phys_addr;
-
- err = ioremap_page_range(addr, addr + size, phys_addr, prot);
- if (err) {
- vunmap((void *)addr);
- return NULL;
- }
-
- return (void __iomem *)(offset + addr);
-}
-
-void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot)
-{
- return __ioremap_caller(phys_addr, size, prot,
- __builtin_return_address(0));
+ return 0;
}
-EXPORT_SYMBOL(__ioremap);

-void iounmap(volatile void __iomem *io_addr)
+int iounmap_allowed(void __iomem *addr)
{
- unsigned long addr = (unsigned long)io_addr & PAGE_MASK;
-
/*
* We could get an address outside vmalloc range in case
* of ioremap_cache() reusing a RAM mapping.
*/
- if (is_vmalloc_addr((void *)addr))
- vunmap((void *)addr);
-}
-EXPORT_SYMBOL(iounmap);
-
-void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size)
-{
- /* For normal memory we already have a cacheable mapping. */
- if (pfn_is_map_memory(__phys_to_pfn(phys_addr)))
- return (void __iomem *)__phys_to_virt(phys_addr);
-
- return __ioremap_caller(phys_addr, size, __pgprot(PROT_NORMAL),
- __builtin_return_address(0));
+ return is_vmalloc_addr(addr) ? 0 : -EINVAL;
}
-EXPORT_SYMBOL(ioremap_cache);

/*
* Must be called after early_fixmap_init
--
2.35.3
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