arm64: mm: Convert to GENERIC_IOREMAP

Add hook for arm64's special operation when ioremap(), 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>
Link: https://lore.kernel.org/r/20220607125027.44946-6-wangkefeng.wang@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 1652a98..ac160aa 100644 (file)
--- 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 3995652..87dd42d 100644 (file)
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -163,13 +163,16 @@ 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))
+bool ioremap_allowed(phys_addr_t phys_addr, size_t size, unsigned long prot);
+#define ioremap_allowed ioremap_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)
 
 /*
  * io{read,write}{16,32,64}be() macros
@@ -184,6 +187,15 @@ extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size);
 
 #include <asm-generic/io.h>
 
+#define ioremap_cache ioremap_cache
+static inline void __iomem *ioremap_cache(phys_addr_t addr, size_t size)
+{
+       if (pfn_is_map_memory(__phys_to_pfn(addr)))
+               return (void __iomem *)__phys_to_virt(addr);
+
+       return ioremap_prot(addr, size, PROT_NORMAL);
+}
+
 /*
  * More restrictive address range checking than the default implementation
  * (PHYS_OFFSET and PHYS_MASK taken into account).

diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index e4dea8d..a5a256e 100644 (file)
--- 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 b21f91c..c5af103 100644 (file)
--- a/arch/arm64/mm/ioremap.c
+++ b/arch/arm64/mm/ioremap.c
@@ -1,96 +1,22 @@
 // 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)
+bool 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;
+       unsigned long last_addr = phys_addr + size - 1;
 
-       /*
-        * Page align the mapping address and size, taking account of any
-        * offset.
-        */
-       phys_addr &= PAGE_MASK;
-       size = PAGE_ALIGN(size + offset);
+       /* Don't allow outside PHYS_MASK */
+       if (last_addr & ~PHYS_MASK)
+               return false;
 
-       /*
-        * 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 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;
-
-       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));
-}
-EXPORT_SYMBOL(__ioremap);
-
-void iounmap(volatile void __iomem *io_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 false;
 
-       return __ioremap_caller(phys_addr, size, __pgprot(PROT_NORMAL),
-                               __builtin_return_address(0));
+       return true;
 }
-EXPORT_SYMBOL(ioremap_cache);
 
 /*
  * Must be called after early_fixmap_init