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Date: Sun, 19 Jul 2015 20:18:23 -0400
From: Dan Williams <dan.j.williams@...el.com>
To: tglx@...utronix.de, mingo@...nel.org, hpa@...or.com
Cc: linux-arch@...r.kernel.org, tony.luck@...el.com,
linux@....linux.org.uk, arnd@...db.de, benh@...nel.crashing.org,
mcgrof@...e.com, x86@...nel.org, linux-kernel@...r.kernel.org,
ralf@...ux-mips.org, Andy Shevchenko <andy.shevchenko@...il.com>,
geert@...ux-m68k.org, toshi.kani@...com,
ross.zwisler@...ux.intel.com, hch@....de,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 09/10] arch: introduce memremap()
Existing users of ioremap_cache() are mapping memory that is known in
advance to not have i/o side effects. These users are forced to cast
away the __iomem annotation, or otherwise neglect to fix the sparse
errors thrown when dereferencing pointers to this memory. Provide
memremap() as a non __iomem annotated ioremap_*() in the case when
ioremap is otherwise a pointer to memory.
The ARCH_HAS_MEMREMAP kconfig symbol is introduced for archs to assert
that it is safe to recast / reuse the return value from ioremap as a
normal pointer to memory. In other words, archs that mandate specific
accessors for __iomem are not memremap() capable and drivers that care,
like pmem, can add a dependency to disable themselves on these archs.
Note, that memremap is a break from the ioremap implementation pattern
of adding a new memremap_<type>() for each mapping type. Instead,
the implementation defines flags that are passed to the central
memremap() implementation.
Outside of ioremap() and ioremap_nocache(), the expectation is that most
calls to ioremap_<type>() are seeking memory-like semantics (e.g.
speculative reads, and prefetching permitted). These callsites can be
moved to memremap() over time.
Cc: Arnd Bergmann <arnd@...db.de>
Acked-by: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
arch/arm/Kconfig | 1 +
arch/arm64/Kconfig | 1 +
arch/arm64/kernel/efi.c | 7 ++---
arch/arm64/kernel/smp_spin_table.c | 17 +++++------
arch/frv/Kconfig | 1 +
arch/m68k/Kconfig | 1 +
arch/metag/Kconfig | 1 +
arch/mips/Kconfig | 1 +
arch/powerpc/Kconfig | 1 +
arch/x86/Kconfig | 1 +
arch/x86/kernel/crash_dump_64.c | 6 ++--
arch/x86/kernel/kdebugfs.c | 8 +++--
arch/x86/kernel/ksysfs.c | 28 +++++++++----------
arch/x86/mm/ioremap.c | 10 +++----
arch/xtensa/Kconfig | 1 +
drivers/acpi/apei/einj.c | 9 +++---
drivers/acpi/apei/erst.c | 6 ++--
drivers/firmware/google/memconsole.c | 5 ++-
include/linux/device.h | 5 +++
include/linux/io.h | 11 +++++++
kernel/resource.c | 51 +++++++++++++++++++++++++++++++++-
lib/Kconfig | 5 +++
22 files changed, 126 insertions(+), 51 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 1c5021002fe4..1d64aae0a226 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -3,6 +3,7 @@ config ARM
default y
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_ELF_RANDOMIZE
+ select ARCH_HAS_MEMREMAP
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAVE_CUSTOM_GPIO_H
select ARCH_HAS_GCOV_PROFILE_ALL
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 318175f62c24..305def28385f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -6,6 +6,7 @@ config ARM64
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_GCOV_PROFILE_ALL
+ select ARCH_HAS_MEMREMAP
select ARCH_HAS_SG_CHAIN
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_USE_CMPXCHG_LOCKREF
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index 9d4aa18f2a82..ed363a0202b9 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -290,8 +290,7 @@ static int __init arm64_enable_runtime_services(void)
pr_info("Remapping and enabling EFI services.\n");
mapsize = memmap.map_end - memmap.map;
- memmap.map = (__force void *)ioremap_cache((phys_addr_t)memmap.phys_map,
- mapsize);
+ memmap.map = memremap(memmap.phys_map, mapsize, MEMREMAP_CACHE);
if (!memmap.map) {
pr_err("Failed to remap EFI memory map\n");
return -1;
@@ -299,8 +298,8 @@ static int __init arm64_enable_runtime_services(void)
memmap.map_end = memmap.map + mapsize;
efi.memmap = &memmap;
- efi.systab = (__force void *)ioremap_cache(efi_system_table,
- sizeof(efi_system_table_t));
+ efi.systab = memremap(efi_system_table, sizeof(efi_system_table_t),
+ MEMREMAP_CACHE);
if (!efi.systab) {
pr_err("Failed to remap EFI System Table\n");
return -1;
diff --git a/arch/arm64/kernel/smp_spin_table.c b/arch/arm64/kernel/smp_spin_table.c
index aef3605a8c47..b9caf6cd44e6 100644
--- a/arch/arm64/kernel/smp_spin_table.c
+++ b/arch/arm64/kernel/smp_spin_table.c
@@ -73,19 +73,19 @@ static int smp_spin_table_cpu_init(unsigned int cpu)
static int smp_spin_table_cpu_prepare(unsigned int cpu)
{
- __le64 __iomem *release_addr;
+ __le64 *release_addr;
if (!cpu_release_addr[cpu])
return -ENODEV;
/*
* The cpu-release-addr may or may not be inside the linear mapping.
- * As ioremap_cache will either give us a new mapping or reuse the
- * existing linear mapping, we can use it to cover both cases. In
- * either case the memory will be MT_NORMAL.
+ * As memremap will either give us a new mapping or reuse the existing
+ * linear mapping, we can use it to cover both cases. In either case
+ * the memory will be MT_NORMAL.
*/
- release_addr = ioremap_cache(cpu_release_addr[cpu],
- sizeof(*release_addr));
+ release_addr = memremap(cpu_release_addr[cpu], sizeof(*release_addr),
+ MEMREMAP_CACHE);
if (!release_addr)
return -ENOMEM;
@@ -97,15 +97,14 @@ static int smp_spin_table_cpu_prepare(unsigned int cpu)
* the boot protocol.
*/
writeq_relaxed(__pa(secondary_holding_pen), release_addr);
- __flush_dcache_area((__force void *)release_addr,
- sizeof(*release_addr));
+ __flush_dcache_area(release_addr, sizeof(*release_addr));
/*
* Send an event to wake up the secondary CPU.
*/
sev();
- iounmap(release_addr);
+ memunmap(release_addr);
return 0;
}
diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig
index 34aa19352dc1..2373bf183527 100644
--- a/arch/frv/Kconfig
+++ b/arch/frv/Kconfig
@@ -14,6 +14,7 @@ config FRV
select OLD_SIGSUSPEND3
select OLD_SIGACTION
select HAVE_DEBUG_STACKOVERFLOW
+ select ARCH_HAS_MEMREMAP
config ZONE_DMA
bool
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 2dd8f63bfbbb..831b1be8c43d 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -23,6 +23,7 @@ config M68K
select MODULES_USE_ELF_RELA
select OLD_SIGSUSPEND3
select OLD_SIGACTION
+ select ARCH_HAS_MEMREMAP
config RWSEM_GENERIC_SPINLOCK
bool
diff --git a/arch/metag/Kconfig b/arch/metag/Kconfig
index 0b389a81c43a..5669fe3eb807 100644
--- a/arch/metag/Kconfig
+++ b/arch/metag/Kconfig
@@ -24,6 +24,7 @@ config METAG
select HAVE_PERF_EVENTS
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_UNDERSCORE_SYMBOL_PREFIX
+ select ARCH_HAS_MEMREMAP
select IRQ_DOMAIN
select MODULES_USE_ELF_RELA
select OF
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index aab7e46cadd5..ac9da90931b9 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -59,6 +59,7 @@ config MIPS
select SYSCTL_EXCEPTION_TRACE
select HAVE_VIRT_CPU_ACCOUNTING_GEN
select HAVE_IRQ_TIME_ACCOUNTING
+ select ARCH_HAS_MEMREMAP
menu "Machine selection"
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 5ef27113b898..50889c7b5c81 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -89,6 +89,7 @@ config PPC
select ARCH_MIGHT_HAVE_PC_SERIO
select BINFMT_ELF
select ARCH_HAS_ELF_RANDOMIZE
+ select ARCH_HAS_MEMREMAP
select OF
select OF_EARLY_FLATTREE
select OF_RESERVED_MEM
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 3dbb7e7909ca..80eb19c8b62d 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -27,6 +27,7 @@ config X86
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FAST_MULTIPLIER
select ARCH_HAS_GCOV_PROFILE_ALL
+ select ARCH_HAS_MEMREMAP
select ARCH_HAS_PMEM_API
select ARCH_HAS_SG_CHAIN
select ARCH_HAVE_NMI_SAFE_CMPXCHG
diff --git a/arch/x86/kernel/crash_dump_64.c b/arch/x86/kernel/crash_dump_64.c
index afa64adb75ee..b87ca059e5fc 100644
--- a/arch/x86/kernel/crash_dump_64.c
+++ b/arch/x86/kernel/crash_dump_64.c
@@ -31,19 +31,19 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
if (!csize)
return 0;
- vaddr = ioremap_cache(pfn << PAGE_SHIFT, PAGE_SIZE);
+ vaddr = memremap(pfn << PAGE_SHIFT, PAGE_SIZE, MEMREMAP_CACHE);
if (!vaddr)
return -ENOMEM;
if (userbuf) {
if (copy_to_user(buf, vaddr + offset, csize)) {
- iounmap(vaddr);
+ memunmap(vaddr);
return -EFAULT;
}
} else
memcpy(buf, vaddr + offset, csize);
set_iounmap_nonlazy();
- iounmap(vaddr);
+ memunmap(vaddr);
return csize;
}
diff --git a/arch/x86/kernel/kdebugfs.c b/arch/x86/kernel/kdebugfs.c
index dc1404bf8e4b..a2248482c14b 100644
--- a/arch/x86/kernel/kdebugfs.c
+++ b/arch/x86/kernel/kdebugfs.c
@@ -49,7 +49,7 @@ static ssize_t setup_data_read(struct file *file, char __user *user_buf,
pa = node->paddr + sizeof(struct setup_data) + pos;
pg = pfn_to_page((pa + count - 1) >> PAGE_SHIFT);
if (PageHighMem(pg)) {
- p = ioremap_cache(pa, count);
+ p = memremap(pa, count, MEMREMAP_CACHE);
if (!p)
return -ENXIO;
} else
@@ -58,7 +58,7 @@ static ssize_t setup_data_read(struct file *file, char __user *user_buf,
remain = copy_to_user(user_buf, p, count);
if (PageHighMem(pg))
- iounmap(p);
+ memunmap(p);
if (remain)
return -EFAULT;
@@ -128,7 +128,7 @@ static int __init create_setup_data_nodes(struct dentry *parent)
pg = pfn_to_page((pa_data+sizeof(*data)-1) >> PAGE_SHIFT);
if (PageHighMem(pg)) {
- data = ioremap_cache(pa_data, sizeof(*data));
+ data = memremap(pa_data, sizeof(*data), MEMREMAP_CACHE);
if (!data) {
kfree(node);
error = -ENXIO;
@@ -144,7 +144,7 @@ static int __init create_setup_data_nodes(struct dentry *parent)
pa_data = data->next;
if (PageHighMem(pg))
- iounmap(data);
+ memunmap(data);
if (error)
goto err_dir;
no++;
diff --git a/arch/x86/kernel/ksysfs.c b/arch/x86/kernel/ksysfs.c
index c2bedaea11f7..d2670bb75a08 100644
--- a/arch/x86/kernel/ksysfs.c
+++ b/arch/x86/kernel/ksysfs.c
@@ -16,8 +16,8 @@
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/mm.h>
+#include <linux/io.h>
-#include <asm/io.h>
#include <asm/setup.h>
static ssize_t version_show(struct kobject *kobj,
@@ -79,12 +79,12 @@ static int get_setup_data_paddr(int nr, u64 *paddr)
*paddr = pa_data;
return 0;
}
- data = ioremap_cache(pa_data, sizeof(*data));
+ data = memremap(pa_data, sizeof(*data), MEMREMAP_CACHE);
if (!data)
return -ENOMEM;
pa_data = data->next;
- iounmap(data);
+ memunmap(data);
i++;
}
return -EINVAL;
@@ -97,17 +97,17 @@ static int __init get_setup_data_size(int nr, size_t *size)
u64 pa_data = boot_params.hdr.setup_data;
while (pa_data) {
- data = ioremap_cache(pa_data, sizeof(*data));
+ data = memremap(pa_data, sizeof(*data), MEMREMAP_CACHE);
if (!data)
return -ENOMEM;
if (nr == i) {
*size = data->len;
- iounmap(data);
+ memunmap(data);
return 0;
}
pa_data = data->next;
- iounmap(data);
+ memunmap(data);
i++;
}
return -EINVAL;
@@ -127,12 +127,12 @@ static ssize_t type_show(struct kobject *kobj,
ret = get_setup_data_paddr(nr, &paddr);
if (ret)
return ret;
- data = ioremap_cache(paddr, sizeof(*data));
+ data = memremap(paddr, sizeof(*data), MEMREMAP_CACHE);
if (!data)
return -ENOMEM;
ret = sprintf(buf, "0x%x\n", data->type);
- iounmap(data);
+ memunmap(data);
return ret;
}
@@ -154,7 +154,7 @@ static ssize_t setup_data_data_read(struct file *fp,
ret = get_setup_data_paddr(nr, &paddr);
if (ret)
return ret;
- data = ioremap_cache(paddr, sizeof(*data));
+ data = memremap(paddr, sizeof(*data), MEMREMAP_CACHE);
if (!data)
return -ENOMEM;
@@ -170,15 +170,15 @@ static ssize_t setup_data_data_read(struct file *fp,
goto out;
ret = count;
- p = ioremap_cache(paddr + sizeof(*data), data->len);
+ p = memremap(paddr + sizeof(*data), data->len, MEMREMAP_CACHE);
if (!p) {
ret = -ENOMEM;
goto out;
}
memcpy(buf, p + off, count);
- iounmap(p);
+ memunmap(p);
out:
- iounmap(data);
+ memunmap(data);
return ret;
}
@@ -250,13 +250,13 @@ static int __init get_setup_data_total_num(u64 pa_data, int *nr)
*nr = 0;
while (pa_data) {
*nr += 1;
- data = ioremap_cache(pa_data, sizeof(*data));
+ data = memremap(pa_data, sizeof(*data), MEMREMAP_CACHE);
if (!data) {
ret = -ENOMEM;
goto out;
}
pa_data = data->next;
- iounmap(data);
+ memunmap(data);
}
out:
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index ccf5c867b2eb..4920f735f551 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -401,12 +401,10 @@ void *xlate_dev_mem_ptr(phys_addr_t phys)
if (page_is_ram(start >> PAGE_SHIFT))
return __va(phys);
- vaddr = ioremap_cache(start, PAGE_SIZE);
- /* Only add the offset on success and return NULL if the ioremap() failed: */
+ vaddr = memremap(start, PAGE_SIZE, MEMREMAP_CACHE);
if (vaddr)
- vaddr += offset;
-
- return vaddr;
+ return vaddr + offset;
+ return NULL;
}
void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
@@ -414,7 +412,7 @@ void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
if (page_is_ram(phys >> PAGE_SHIFT))
return;
- iounmap((void __iomem *)((unsigned long)addr & PAGE_MASK));
+ memunmap((void *)((unsigned long)addr & PAGE_MASK));
}
static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] __page_aligned_bss;
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index e5b872ba2484..da1078692c41 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -3,6 +3,7 @@ config ZONE_DMA
config XTENSA
def_bool y
+ select ARCH_HAS_MEMREMAP
select ARCH_WANT_FRAME_POINTERS
select ARCH_WANT_IPC_PARSE_VERSION
select ARCH_WANT_OPTIONAL_GPIOLIB
diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
index a095d4f858da..d4992fea6994 100644
--- a/drivers/acpi/apei/einj.c
+++ b/drivers/acpi/apei/einj.c
@@ -318,7 +318,8 @@ static int __einj_error_trigger(u64 trigger_paddr, u32 type,
sizeof(*trigger_tab) - 1);
goto out;
}
- trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab));
+ trigger_tab = memremap(trigger_paddr, sizeof(*trigger_tab),
+ MEMREMAP_CACHE);
if (!trigger_tab) {
pr_err(EINJ_PFX "Failed to map trigger table!\n");
goto out_rel_header;
@@ -346,8 +347,8 @@ static int __einj_error_trigger(u64 trigger_paddr, u32 type,
(unsigned long long)trigger_paddr + table_size - 1);
goto out_rel_header;
}
- iounmap(trigger_tab);
- trigger_tab = ioremap_cache(trigger_paddr, table_size);
+ memunmap(trigger_tab);
+ trigger_tab = memremap(trigger_paddr, table_size, MEMREMAP_CACHE);
if (!trigger_tab) {
pr_err(EINJ_PFX "Failed to map trigger table!\n");
goto out_rel_entry;
@@ -409,7 +410,7 @@ out_rel_header:
release_mem_region(trigger_paddr, sizeof(*trigger_tab));
out:
if (trigger_tab)
- iounmap(trigger_tab);
+ memunmap(trigger_tab);
return rc;
}
diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index 3670bbab57a3..dc49b0b42d65 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -77,7 +77,7 @@ static struct acpi_table_erst *erst_tab;
static struct erst_erange {
u64 base;
u64 size;
- void __iomem *vaddr;
+ void *vaddr;
u32 attr;
} erst_erange;
@@ -1185,8 +1185,8 @@ static int __init erst_init(void)
goto err_unmap_reg;
}
rc = -ENOMEM;
- erst_erange.vaddr = ioremap_cache(erst_erange.base,
- erst_erange.size);
+ erst_erange.vaddr = memremap(erst_erange.base, erst_erange.size,
+ MEMREMAP_CACHE);
if (!erst_erange.vaddr)
goto err_release_erange;
diff --git a/drivers/firmware/google/memconsole.c b/drivers/firmware/google/memconsole.c
index 2f569aaed4c7..2b8160d12ad6 100644
--- a/drivers/firmware/google/memconsole.c
+++ b/drivers/firmware/google/memconsole.c
@@ -52,14 +52,15 @@ static ssize_t memconsole_read(struct file *filp, struct kobject *kobp,
char *memconsole;
ssize_t ret;
- memconsole = ioremap_cache(memconsole_baseaddr, memconsole_length);
+ memconsole = memremap(memconsole_baseaddr, memconsole_length,
+ MEMREMAP_CACHE);
if (!memconsole) {
pr_err("memconsole: ioremap_cache failed\n");
return -ENOMEM;
}
ret = memory_read_from_buffer(buf, count, &pos, memconsole,
memconsole_length);
- iounmap(memconsole);
+ memunmap(memconsole);
return ret;
}
diff --git a/include/linux/device.h b/include/linux/device.h
index 5a31bf3a4024..04e53eab71c5 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -668,6 +668,11 @@ extern void devm_free_pages(struct device *dev, unsigned long addr);
void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
+static inline void *devm_memremap_resource(struct device *dev, struct resource *res)
+{
+ return (void __force *) devm_ioremap_resource(dev, res);
+}
+
/* allows to add/remove a custom action to devres stack */
int devm_add_action(struct device *dev, void (*action)(void *), void *data);
void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
diff --git a/include/linux/io.h b/include/linux/io.h
index 080a4fbf2ba4..2983b6e63970 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -192,4 +192,15 @@ static inline int arch_phys_wc_index(int handle)
#endif
#endif
+enum {
+ MEMREMAP_WB = 1 << 0,
+ MEMREMAP_WT = 1 << 1,
+ MEMREMAP_WC = 1 << 2,
+ MEMREMAP_STRICT = 1 << 3,
+ MEMREMAP_CACHE = MEMREMAP_WB,
+};
+
+extern void *memremap(resource_size_t offset, size_t size, unsigned long flags);
+extern void memunmap(void *addr);
+
#endif /* _LINUX_IO_H */
diff --git a/kernel/resource.c b/kernel/resource.c
index fed052a1bc9f..a96376be513a 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -23,7 +23,7 @@
#include <linux/pfn.h>
#include <linux/mm.h>
#include <linux/resource_ext.h>
-#include <asm/io.h>
+#include <linux/io.h>
struct resource ioport_resource = {
@@ -528,6 +528,55 @@ int region_is_ram(resource_size_t start, unsigned long size)
return ret;
}
+#ifdef CONFIG_ARCH_HAS_MEMREMAP
+/*
+ * memremap() is "ioremap" for cases where it is known that the resource
+ * being mapped does not have i/o side effects and the __iomem
+ * annotation is not applicable.
+ */
+static bool memremap_valid(resource_size_t offset, size_t size)
+{
+ if (region_is_ram(offset, size) != 0) {
+ WARN_ONCE(1, "memremap attempted on ram %pa size: %zu\n",
+ &offset, size);
+ return false;
+ }
+ return true;
+}
+
+void *memremap(resource_size_t offset, size_t size, unsigned long flags)
+{
+ void __iomem *addr = NULL;
+
+ if (!memremap_valid(offset, size))
+ return NULL;
+
+ /* try all mapping types requested until one returns non-NULL */
+ if (flags & MEMREMAP_CACHE) {
+ if (flags & MEMREMAP_STRICT)
+ addr = strict_ioremap_cache(offset, size);
+ else
+ addr = ioremap_cache(offset, size);
+ }
+
+ if (!addr && (flags & MEMREMAP_WT)) {
+ if (flags & MEMREMAP_STRICT)
+ addr = strict_ioremap_wt(offset, size);
+ else
+ addr = ioremap_wt(offset, size);
+ }
+
+ return (void __force *) addr;
+}
+EXPORT_SYMBOL(memremap);
+
+void memunmap(void *addr)
+{
+ iounmap((void __iomem __force *) addr);
+}
+EXPORT_SYMBOL(memunmap);
+#endif /* CONFIG_ARCH_HAS_MEMREMAP */
+
void __weak arch_remove_reservations(struct resource *avail)
{
}
diff --git a/lib/Kconfig b/lib/Kconfig
index 3a2ef67db6c7..097b99073924 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -526,7 +526,10 @@ source "lib/fonts/Kconfig"
#
config ARCH_HAS_SG_CHAIN
- def_bool n
+ bool
+
+config ARCH_HAS_MEMREMAP
+ bool
config ARCH_HAS_PMEM_API
bool
--
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