generic ioremap (and lots of cleanups)

2019-08-17 Thread Christoph Hellwig 
Hi all,

the last patches in this series add a generic ioremap implementation,
and switch our 3 most recent and thus most tidy architeture ports over
to use it.  With a little work and an additional arch hook or two the
implementation should be able to eventually cover more than half of
our ports.

The patches before that clean up various lose ends in the ioremap
and iounmap implementations.

A git tree is also available here:

git://git.infradead.org/users/hch/misc.git generic-ioremap

Gitweb:


http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/generic-ioremap

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[PATCH 01/26] mtd/maps/pxa2xx: use ioremap_cache insted of ioremap_cached

2019-08-17 Thread Christoph Hellwig 
pxa2xx-flash is the only user of ioremap_cached, which is an alias
for ioremap_cache anyway.

Signed-off-by: Christoph Hellwig 
---
 drivers/mtd/maps/pxa2xx-flash.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/mtd/maps/pxa2xx-flash.c b/drivers/mtd/maps/pxa2xx-flash.c
index cebb346877a9..7d96758a8f04 100644
--- a/drivers/mtd/maps/pxa2xx-flash.c
+++ b/drivers/mtd/maps/pxa2xx-flash.c
@@ -68,8 +68,7 @@ static int pxa2xx_flash_probe(struct platform_device *pdev)
   info->map.name);
return -ENOMEM;
}
-   info->map.cached =
-   ioremap_cached(info->map.phys, info->map.size);
+   info->map.cached = ioremap_cache(info->map.phys, info->map.size);
if (!info->map.cached)
printk(KERN_WARNING "Failed to ioremap cached %s\n",
   info->map.name);
-- 
2.20.1

[PATCH 02/26] arm, unicore32: remove ioremap_cached

2019-08-17 Thread Christoph Hellwig 
No users of ioremap_cached are left, remove it.

Signed-off-by: Christoph Hellwig 
---
 arch/arm/include/asm/io.h   | 6 --
 arch/arm/mm/ioremap.c   | 4 
 arch/arm/mm/mmu.c   | 2 +-
 arch/arm/mm/nommu.c | 4 
 arch/unicore32/include/asm/io.h | 4 +---
 arch/unicore32/mm/ioremap.c | 8 
 6 files changed, 2 insertions(+), 26 deletions(-)

diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 7a0596fcb2e7..924f9dd502ed 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -400,12 +400,6 @@ void __iomem *ioremap(resource_size_t res_cookie, size_t 
size);
 void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size);
 #define ioremap_cache ioremap_cache
 
-/*
- * Do not use ioremap_cached in new code. Provided for the benefit of
- * the pxa2xx-flash MTD driver only.
- */
-void __iomem *ioremap_cached(resource_size_t res_cookie, size_t size);
-
 void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size);
 #define ioremap_wc ioremap_wc
 #define ioremap_wt ioremap_wc
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index d42b93316183..72286f9a4d30 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -382,15 +382,11 @@ void __iomem *ioremap(resource_size_t res_cookie, size_t 
size)
 EXPORT_SYMBOL(ioremap);
 
 void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size)
-   __alias(ioremap_cached);
-
-void __iomem *ioremap_cached(resource_size_t res_cookie, size_t size)
 {
return arch_ioremap_caller(res_cookie, size, MT_DEVICE_CACHED,
   __builtin_return_address(0));
 }
 EXPORT_SYMBOL(ioremap_cache);
-EXPORT_SYMBOL(ioremap_cached);
 
 void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size)
 {
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index d9a0038774a6..ed08afc3f5e5 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -259,7 +259,7 @@ static struct mem_type mem_types[] __ro_after_init = {
.prot_sect  = PROT_SECT_DEVICE,
.domain = DOMAIN_IO,
},
-   [MT_DEVICE_CACHED] = {/* ioremap_cached */
+   [MT_DEVICE_CACHED] = {/* ioremap_cache */
.prot_pte   = PROT_PTE_DEVICE | L_PTE_MT_DEV_CACHED,
.prot_l1= PMD_TYPE_TABLE,
.prot_sect  = PROT_SECT_DEVICE | PMD_SECT_WB,
diff --git a/arch/arm/mm/nommu.c b/arch/arm/mm/nommu.c
index 24ecf8d30a1e..8b3d7191e2b8 100644
--- a/arch/arm/mm/nommu.c
+++ b/arch/arm/mm/nommu.c
@@ -206,15 +206,11 @@ void __iomem *ioremap(resource_size_t res_cookie, size_t 
size)
 EXPORT_SYMBOL(ioremap);
 
 void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size)
-   __alias(ioremap_cached);
-
-void __iomem *ioremap_cached(resource_size_t res_cookie, size_t size)
 {
return __arm_ioremap_caller(res_cookie, size, MT_DEVICE_CACHED,
__builtin_return_address(0));
 }
 EXPORT_SYMBOL(ioremap_cache);
-EXPORT_SYMBOL(ioremap_cached);
 
 void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size)
 {
diff --git a/arch/unicore32/include/asm/io.h b/arch/unicore32/include/asm/io.h
index c71aa4b95996..4b460e01acfa 100644
--- a/arch/unicore32/include/asm/io.h
+++ b/arch/unicore32/include/asm/io.h
@@ -18,10 +18,9 @@
 #include 
 
 /*
- * __uc32_ioremap and __uc32_ioremap_cached takes CPU physical address.
+ * __uc32_ioremap takes CPU physical address.
  */
 extern void __iomem *__uc32_ioremap(unsigned long, size_t);
-extern void __iomem *__uc32_ioremap_cached(unsigned long, size_t);
 extern void __uc32_iounmap(volatile void __iomem *addr);
 
 /*
@@ -32,7 +31,6 @@ extern void __uc32_iounmap(volatile void __iomem *addr);
  *
  */
 #define ioremap(cookie, size)  __uc32_ioremap(cookie, size)
-#define ioremap_cached(cookie, size)   __uc32_ioremap_cached(cookie, size)
 #define ioremap_nocache(cookie, size)  __uc32_ioremap(cookie, size)
 #define iounmap(cookie)__uc32_iounmap(cookie)
 
diff --git a/arch/unicore32/mm/ioremap.c b/arch/unicore32/mm/ioremap.c
index cf6d656f240c..46a64bd6156a 100644
--- a/arch/unicore32/mm/ioremap.c
+++ b/arch/unicore32/mm/ioremap.c
@@ -220,14 +220,6 @@ __uc32_ioremap(unsigned long phys_addr, size_t size)
 }
 EXPORT_SYMBOL(__uc32_ioremap);
 
-void __iomem *
-__uc32_ioremap_cached(unsigned long phys_addr, size_t size)
-{
-   return __uc32_ioremap_caller(phys_addr, size, MT_DEVICE_CACHED,
-   __builtin_return_address(0));
-}
-EXPORT_SYMBOL(__uc32_ioremap_cached);
-
 void __uc32_iounmap(volatile void __iomem *io_addr)
 {
void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
-- 
2.20.1

[PATCH 03/26] m68k, microblaze: remove ioremap_fullcache

2019-08-17 Thread Christoph Hellwig 
No callers of this function.

Signed-off-by: Christoph Hellwig 
---
 arch/m68k/include/asm/kmap.h | 7 ---
 arch/microblaze/include/asm/io.h | 1 -
 2 files changed, 8 deletions(-)

diff --git a/arch/m68k/include/asm/kmap.h b/arch/m68k/include/asm/kmap.h
index aac7f045f7f0..03d904fe6087 100644
--- a/arch/m68k/include/asm/kmap.h
+++ b/arch/m68k/include/asm/kmap.h
@@ -43,13 +43,6 @@ static inline void __iomem *ioremap_wt(unsigned long 
physaddr,
return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
 }
 
-#define ioremap_fullcache ioremap_fullcache
-static inline void __iomem *ioremap_fullcache(unsigned long physaddr,
- unsigned long size)
-{
-   return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
-}
-
 #define memset_io memset_io
 static inline void memset_io(volatile void __iomem *addr, unsigned char val,
 int count)
diff --git a/arch/microblaze/include/asm/io.h b/arch/microblaze/include/asm/io.h
index c7968139486f..86c95b2a1ce1 100644
--- a/arch/microblaze/include/asm/io.h
+++ b/arch/microblaze/include/asm/io.h
@@ -40,7 +40,6 @@ extern void iounmap(volatile void __iomem *addr);
 
 extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
 #define ioremap_nocache(addr, size)ioremap((addr), (size))
-#define ioremap_fullcache(addr, size)  ioremap((addr), (size))
 #define ioremap_wc(addr, size) ioremap((addr), (size))
 #define ioremap_wt(addr, size) ioremap((addr), (size))
 
-- 
2.20.1

[PATCH 04/26] mips: remove ioremap_cachable

2019-08-17 Thread Christoph Hellwig 
Just define ioremap_cache directly.

Signed-off-by: Christoph Hellwig 
---
 arch/mips/include/asm/io.h | 7 +++
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index 97a280640daf..c02db986ddf5 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -262,11 +262,11 @@ static inline void __iomem *ioremap_prot(phys_addr_t 
offset,
 #define ioremap_uc ioremap_nocache
 
 /*
- * ioremap_cachable -  map bus memory into CPU space
+ * ioremap_cache - map bus memory into CPU space
  * @offset:bus address of the memory
  * @size:  size of the resource to map
  *
- * ioremap_nocache performs a platform specific sequence of operations to
+ * ioremap_cache performs a platform specific sequence of operations to
  * make bus memory CPU accessible via the readb/readw/readl/writeb/
  * writew/writel functions and the other mmio helpers. The returned
  * address is not guaranteed to be usable directly as a virtual
@@ -276,9 +276,8 @@ static inline void __iomem *ioremap_prot(phys_addr_t offset,
  * the CPU.  Also enables full write-combining. Useful for some
  * memory-like regions on I/O busses.
  */
-#define ioremap_cachable(offset, size) \
+#define ioremap_cache(offset, size)\
__ioremap_mode((offset), (size), _page_cachable_default)
-#define ioremap_cache ioremap_cachable
 
 /*
  * ioremap_wc -   map bus memory into CPU space
-- 
2.20.1

[PATCH 05/26] openrisc: map as uncached in ioremap

2019-08-17 Thread Christoph Hellwig 
Openrisc is the only architecture not mapping ioremap as uncached,
which has been the default since the Linux 2.6.x days.  Switch it
over to implement uncached semantics by default.

Signed-off-by: Christoph Hellwig 
---
 arch/openrisc/include/asm/io.h  | 20 +++-
 arch/openrisc/include/asm/pgtable.h |  2 +-
 arch/openrisc/mm/ioremap.c  |  8 
 3 files changed, 8 insertions(+), 22 deletions(-)

diff --git a/arch/openrisc/include/asm/io.h b/arch/openrisc/include/asm/io.h
index 06a710757789..5b81a96ab85e 100644
--- a/arch/openrisc/include/asm/io.h
+++ b/arch/openrisc/include/asm/io.h
@@ -25,25 +25,11 @@
 #define PIO_OFFSET 0
 #define PIO_MASK   0
 
-#define ioremap_nocache ioremap_nocache
+#define ioremap_nocache ioremap
 #include 
 #include 
 
-extern void __iomem *__ioremap(phys_addr_t offset, unsigned long size,
-   pgprot_t prot);
-
-static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
-{
-   return __ioremap(offset, size, PAGE_KERNEL);
-}
-
-/* #define _PAGE_CI   0x002 */
-static inline void __iomem *ioremap_nocache(phys_addr_t offset,
-unsigned long size)
-{
-   return __ioremap(offset, size,
-__pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_CI));
-}
-
+void __iomem *ioremap(phys_addr_t offset, unsigned long size);
 extern void iounmap(void *addr);
+
 #endif
diff --git a/arch/openrisc/include/asm/pgtable.h 
b/arch/openrisc/include/asm/pgtable.h
index 497fd908a4c4..2fe9ff5b5d6f 100644
--- a/arch/openrisc/include/asm/pgtable.h
+++ b/arch/openrisc/include/asm/pgtable.h
@@ -97,7 +97,7 @@ extern void paging_init(void);
 /* Define some higher level generic page attributes.
  *
  * If you change _PAGE_CI definition be sure to change it in
- * io.h for ioremap_nocache() too.
+ * io.h for ioremap() too.
  */
 
 /*
diff --git a/arch/openrisc/mm/ioremap.c b/arch/openrisc/mm/ioremap.c
index e0c551ca0891..8f8e97f7eac9 100644
--- a/arch/openrisc/mm/ioremap.c
+++ b/arch/openrisc/mm/ioremap.c
@@ -34,8 +34,7 @@ static unsigned int fixmaps_used __initdata;
  * have to convert them into an offset in a page-aligned mapping, but the
  * caller shouldn't need to know that small detail.
  */
-void __iomem *__ref
-__ioremap(phys_addr_t addr, unsigned long size, pgprot_t prot)
+void __iomem *__ref ioremap(phys_addr_t addr, unsigned long size)
 {
phys_addr_t p;
unsigned long v;
@@ -66,7 +65,8 @@ __ioremap(phys_addr_t addr, unsigned long size, pgprot_t prot)
fixmaps_used += (size >> PAGE_SHIFT);
}
 
-   if (ioremap_page_range(v, v + size, p, prot)) {
+   if (ioremap_page_range(v, v + size, p,
+   __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_CI))) {
if (likely(mem_init_done))
vfree(area->addr);
else
@@ -76,7 +76,7 @@ __ioremap(phys_addr_t addr, unsigned long size, pgprot_t prot)
 
return (void __iomem *)(offset + (char *)v);
 }
-EXPORT_SYMBOL(__ioremap);
+EXPORT_SYMBOL(ioremap);
 
 void iounmap(void *addr)
 {
-- 
2.20.1

[PATCH 12/26] x86: clean up ioremap

2019-08-17 Thread Christoph Hellwig 
Use ioremap as the main implemented function, and defined
ioremap_nocache to it as a deprecated alias.

Signed-off-by: Christoph Hellwig 
---
 arch/x86/include/asm/io.h | 8 ++--
 arch/x86/mm/ioremap.c | 8 
 arch/x86/mm/pageattr.c| 4 ++--
 3 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 6bed97ff6db2..6b5cc41319a7 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -180,8 +180,6 @@ static inline unsigned int isa_virt_to_bus(volatile void 
*address)
  * The default ioremap() behavior is non-cached; if you need something
  * else, you probably want one of the following.
  */
-extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long 
size);
-#define ioremap_nocache ioremap_nocache
 extern void __iomem *ioremap_uc(resource_size_t offset, unsigned long size);
 #define ioremap_uc ioremap_uc
 extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
@@ -205,11 +203,9 @@ extern void __iomem *ioremap_encrypted(resource_size_t 
phys_addr, unsigned long
  * If the area you are trying to map is a PCI BAR you should have a
  * look at pci_iomap().
  */
-static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
-{
-   return ioremap_nocache(offset, size);
-}
+void __iomem *ioremap(resource_size_t offset, unsigned long size);
 #define ioremap ioremap
+#define ioremap_nocache ioremap
 
 extern void iounmap(volatile void __iomem *addr);
 #define iounmap iounmap
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 63e99f15d7cf..c9e90211bddb 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -279,11 +279,11 @@ __ioremap_caller(resource_size_t phys_addr, unsigned long 
size,
 }
 
 /**
- * ioremap_nocache -   map bus memory into CPU space
+ * ioremap -   map bus memory into CPU space
  * @phys_addr:bus address of the memory
  * @size:  size of the resource to map
  *
- * ioremap_nocache performs a platform specific sequence of operations to
+ * ioremap performs a platform specific sequence of operations to
  * make bus memory CPU accessible via the readb/readw/readl/writeb/
  * writew/writel functions and the other mmio helpers. The returned
  * address is not guaranteed to be usable directly as a virtual
@@ -299,7 +299,7 @@ __ioremap_caller(resource_size_t phys_addr, unsigned long 
size,
  *
  * Must be freed with iounmap.
  */
-void __iomem *ioremap_nocache(resource_size_t phys_addr, unsigned long size)
+void __iomem *ioremap(resource_size_t phys_addr, unsigned long size)
 {
/*
 * Ideally, this should be:
@@ -314,7 +314,7 @@ void __iomem *ioremap_nocache(resource_size_t phys_addr, 
unsigned long size)
return __ioremap_caller(phys_addr, size, pcm,
__builtin_return_address(0), false);
 }
-EXPORT_SYMBOL(ioremap_nocache);
+EXPORT_SYMBOL(ioremap);
 
 /**
  * ioremap_uc -   map bus memory into CPU space as strongly uncachable
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 6a9a77a403c9..5b7a9231b85b 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -1774,7 +1774,7 @@ static inline int cpa_clear_pages_array(struct page 
**pages, int numpages,
 int _set_memory_uc(unsigned long addr, int numpages)
 {
/*
-* for now UC MINUS. see comments in ioremap_nocache()
+* for now UC MINUS. see comments in ioremap()
 * If you really need strong UC use ioremap_uc(), but note
 * that you cannot override IO areas with set_memory_*() as
 * these helpers cannot work with IO memory.
@@ -1789,7 +1789,7 @@ int set_memory_uc(unsigned long addr, int numpages)
int ret;
 
/*
-* for now UC MINUS. see comments in ioremap_nocache()
+* for now UC MINUS. see comments in ioremap()
 */
ret = reserve_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE,
  _PAGE_CACHE_MODE_UC_MINUS, NULL);
-- 
2.20.1

[PATCH 13/26] xtensa: clean up ioremap

2019-08-17 Thread Christoph Hellwig 
Use ioremap as the main implemented function, and defined
ioremap_nocache to it as a deprecated alias.

Signed-off-by: Christoph Hellwig 
---
 arch/xtensa/include/asm/io.h | 14 --
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/arch/xtensa/include/asm/io.h b/arch/xtensa/include/asm/io.h
index da3e783f896b..ffadc99c8601 100644
--- a/arch/xtensa/include/asm/io.h
+++ b/arch/xtensa/include/asm/io.h
@@ -31,8 +31,7 @@ void xtensa_iounmap(volatile void __iomem *addr);
 /*
  * Return the virtual address for the specified bus memory.
  */
-static inline void __iomem *ioremap_nocache(unsigned long offset,
-   unsigned long size)
+static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
 {
if (offset >= XCHAL_KIO_PADDR
&& offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
@@ -51,15 +50,10 @@ static inline void __iomem *ioremap_cache(unsigned long 
offset,
return xtensa_ioremap_cache(offset, size);
 }
 #define ioremap_cache ioremap_cache
-#define ioremap_nocache ioremap_nocache
-
-#define ioremap_wc ioremap_nocache
-#define ioremap_wt ioremap_nocache
 
-static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
-{
-   return ioremap_nocache(offset, size);
-}
+#define ioremap_nocache ioremap
+#define ioremap_wc ioremap
+#define ioremap_wt ioremap
 
 static inline void iounmap(volatile void __iomem *addr)
 {
-- 
2.20.1

[PATCH 11/26] parisc: remove __ioremap

2019-08-17 Thread Christoph Hellwig 
__ioremap is always called with the _PAGE_NO_CACHE, so fold the whole
thing and rename it to ioremap.  This allows allows to remove the
special EISA quirk to force _PAGE_NO_CACHE.

Signed-off-by: Christoph Hellwig 
---
 arch/parisc/include/asm/io.h | 11 +--
 arch/parisc/mm/ioremap.c | 16 +++-
 2 files changed, 4 insertions(+), 23 deletions(-)

diff --git a/arch/parisc/include/asm/io.h b/arch/parisc/include/asm/io.h
index 93d37010b375..46212b52c23e 100644
--- a/arch/parisc/include/asm/io.h
+++ b/arch/parisc/include/asm/io.h
@@ -127,16 +127,7 @@ static inline void gsc_writeq(unsigned long long val, 
unsigned long addr)
 /*
  * The standard PCI ioremap interfaces
  */
-
-extern void __iomem * __ioremap(unsigned long offset, unsigned long size, 
unsigned long flags);
-
-/* Most machines react poorly to I/O-space being cacheable... Instead let's
- * define ioremap() in terms of ioremap_nocache().
- */
-static inline void __iomem * ioremap(unsigned long offset, unsigned long size)
-{
-   return __ioremap(offset, size, _PAGE_NO_CACHE);
-}
+void __iomem *ioremap(unsigned long offset, unsigned long size);
 #define ioremap_nocache(off, sz)   ioremap((off), (sz))
 #define ioremap_wc ioremap_nocache
 #define ioremap_uc ioremap_nocache
diff --git a/arch/parisc/mm/ioremap.c b/arch/parisc/mm/ioremap.c
index 92a9b5f12f98..fe65e27f882b 100644
--- a/arch/parisc/mm/ioremap.c
+++ b/arch/parisc/mm/ioremap.c
@@ -25,23 +25,13 @@
  * have to convert them into an offset in a page-aligned mapping, but the
  * caller shouldn't need to know that small detail.
  */
-void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned 
long flags)
+void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
 {
void __iomem *addr;
struct vm_struct *area;
unsigned long offset, last_addr;
pgprot_t pgprot;
 
-#ifdef CONFIG_EISA
-   unsigned long end = phys_addr + size - 1;
-   /* Support EISA addresses */
-   if ((phys_addr >= 0x0008 && end < 0x000f) ||
-   (phys_addr >= 0x0050 && end < 0x03bf)) {
-   phys_addr |= F_EXTEND(0xfc00);
-   flags |= _PAGE_NO_CACHE;
-   }
-#endif
-
/* Don't allow wraparound or zero size */
last_addr = phys_addr + size - 1;
if (!size || last_addr < phys_addr)
@@ -65,7 +55,7 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned 
long size, unsigned l
}
 
pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY |
- _PAGE_ACCESSED | flags);
+ _PAGE_ACCESSED | _PAGE_NO_CACHE);
 
/*
 * Mappings have to be page-aligned
@@ -90,7 +80,7 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned 
long size, unsigned l
 
return (void __iomem *) (offset + (char __iomem *)addr);
 }
-EXPORT_SYMBOL(__ioremap);
+EXPORT_SYMBOL(ioremap);
 
 void iounmap(const volatile void __iomem *addr)
 {
-- 
2.20.1

[PATCH 06/26] ia64: rename ioremap_nocache to ioremap_uc

2019-08-17 Thread Christoph Hellwig 
On ia64 ioremap_nocache fails if attributs don't match.  Not other
architectures does this, and we plan to get rid of ioremap_nocache.
So get rid of the special semantics and define ioremap_nocache in
terms of ioremap as no portable driver could rely on the behavior
anyway.

However x86 implements ioremap_uc with a in a similar way as the ia64
version of ioremap_nocache, so implement that instead.

Signed-off-by: Christoph Hellwig 
---
 arch/ia64/include/asm/io.h | 6 +++---
 arch/ia64/mm/ioremap.c | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h
index a511d62d447a..febd2c6ea0b4 100644
--- a/arch/ia64/include/asm/io.h
+++ b/arch/ia64/include/asm/io.h
@@ -412,16 +412,16 @@ __writeq (unsigned long val, volatile void __iomem *addr)
 # ifdef __KERNEL__
 
 extern void __iomem * ioremap(unsigned long offset, unsigned long size);
-extern void __iomem * ioremap_nocache (unsigned long offset, unsigned long 
size);
+extern void __iomem * ioremap_uc(unsigned long offset, unsigned long size);
 extern void iounmap (volatile void __iomem *addr);
 static inline void __iomem * ioremap_cache (unsigned long phys_addr, unsigned 
long size)
 {
return ioremap(phys_addr, size);
 }
 #define ioremap ioremap
-#define ioremap_nocache ioremap_nocache
+#define ioremap_nocache ioremap
 #define ioremap_cache ioremap_cache
-#define ioremap_uc ioremap_nocache
+#define ioremap_uc ioremap_uc
 #define iounmap iounmap
 
 /*
diff --git a/arch/ia64/mm/ioremap.c b/arch/ia64/mm/ioremap.c
index 0c0de2c4ec69..a09cfa064536 100644
--- a/arch/ia64/mm/ioremap.c
+++ b/arch/ia64/mm/ioremap.c
@@ -99,14 +99,14 @@ ioremap (unsigned long phys_addr, unsigned long size)
 EXPORT_SYMBOL(ioremap);
 
 void __iomem *
-ioremap_nocache (unsigned long phys_addr, unsigned long size)
+ioremap_uc(unsigned long phys_addr, unsigned long size)
 {
if (kern_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
return NULL;
 
return __ioremap_uc(phys_addr);
 }
-EXPORT_SYMBOL(ioremap_nocache);
+EXPORT_SYMBOL(ioremap_uc);
 
 void
 early_iounmap (volatile void __iomem *addr, unsigned long size)
-- 
2.20.1

[PATCH 10/26] nios2: remove __ioremap

2019-08-17 Thread Christoph Hellwig 
The cacheflag argument to __ioremap is always 0, so just implement
ioremap directly.

Signed-off-by: Christoph Hellwig 
---
 arch/nios2/include/asm/io.h | 20 
 arch/nios2/mm/ioremap.c | 17 +++--
 2 files changed, 7 insertions(+), 30 deletions(-)

diff --git a/arch/nios2/include/asm/io.h b/arch/nios2/include/asm/io.h
index 9010243077ab..74ab34aa6731 100644
--- a/arch/nios2/include/asm/io.h
+++ b/arch/nios2/include/asm/io.h
@@ -25,29 +25,17 @@
 #define writew_relaxed(x, addr)writew(x, addr)
 #define writel_relaxed(x, addr)writel(x, addr)
 
-extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size,
-   unsigned long cacheflag);
+void __iomem *ioremap(unsigned long physaddr, unsigned long size);
 extern void __iounmap(void __iomem *addr);
 
-static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
-{
-   return __ioremap(physaddr, size, 0);
-}
-
-static inline void __iomem *ioremap_nocache(unsigned long physaddr,
-   unsigned long size)
-{
-   return __ioremap(physaddr, size, 0);
-}
-
 static inline void iounmap(void __iomem *addr)
 {
__iounmap(addr);
 }
 
-#define ioremap_nocache ioremap_nocache
-#define ioremap_wc ioremap_nocache
-#define ioremap_wt ioremap_nocache
+#define ioremap_nocache ioremap
+#define ioremap_wc ioremap
+#define ioremap_wt ioremap
 
 /* Pages to physical address... */
 #define page_to_phys(page) virt_to_phys(page_to_virt(page))
diff --git a/arch/nios2/mm/ioremap.c b/arch/nios2/mm/ioremap.c
index 3a28177a01eb..7a1a27f3daa3 100644
--- a/arch/nios2/mm/ioremap.c
+++ b/arch/nios2/mm/ioremap.c
@@ -112,8 +112,7 @@ static int remap_area_pages(unsigned long address, unsigned 
long phys_addr,
 /*
  * Map some physical address range into the kernel address space.
  */
-void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
-   unsigned long cacheflag)
+void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
 {
struct vm_struct *area;
unsigned long offset;
@@ -139,15 +138,6 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned 
long size,
return NULL;
}
 
-   /*
-* Map uncached objects in the low part of address space to
-* CONFIG_NIOS2_IO_REGION_BASE
-*/
-   if (IS_MAPPABLE_UNCACHEABLE(phys_addr) &&
-   IS_MAPPABLE_UNCACHEABLE(last_addr) &&
-   !(cacheflag & _PAGE_CACHED))
-   return (void __iomem *)(CONFIG_NIOS2_IO_REGION_BASE + 
phys_addr);
-
/* Mappings have to be page-aligned */
offset = phys_addr & ~PAGE_MASK;
phys_addr &= PAGE_MASK;
@@ -158,14 +148,13 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned 
long size,
if (!area)
return NULL;
addr = area->addr;
-   if (remap_area_pages((unsigned long) addr, phys_addr, size,
-   cacheflag)) {
+   if (remap_area_pages((unsigned long) addr, phys_addr, size, 0)) {
vunmap(addr);
return NULL;
}
return (void __iomem *) (offset + (char *)addr);
 }
-EXPORT_SYMBOL(__ioremap);
+EXPORT_SYMBOL(ioremap);
 
 /*
  * __iounmap unmaps nearly everything, so be careful
-- 
2.20.1

[PATCH 07/26] hexagon: clean up ioremap

2019-08-17 Thread Christoph Hellwig 
Use ioremap as the main implemented function, and defined
ioremap_nocache to it as a deprecated alias.

Signed-off-by: Christoph Hellwig 
---
 arch/hexagon/include/asm/io.h   | 11 ++-
 arch/hexagon/kernel/hexagon_ksyms.c |  2 +-
 arch/hexagon/mm/ioremap.c   |  2 +-
 3 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h
index ba1a444d55b3..89537dc1cf97 100644
--- a/arch/hexagon/include/asm/io.h
+++ b/arch/hexagon/include/asm/io.h
@@ -171,16 +171,9 @@ static inline void writel(u32 data, volatile void __iomem 
*addr)
 #define writew_relaxed __raw_writew
 #define writel_relaxed __raw_writel
 
-/*
- * Need an mtype somewhere in here, for cache type deals?
- * This is probably too long for an inline.
- */
-void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size);
+void __iomem *ioremap(unsigned long phys_addr, unsigned long size);
+#define ioremap_nocache ioremap
 
-static inline void __iomem *ioremap(unsigned long phys_addr, unsigned long 
size)
-{
-   return ioremap_nocache(phys_addr, size);
-}
 
 static inline void iounmap(volatile void __iomem *addr)
 {
diff --git a/arch/hexagon/kernel/hexagon_ksyms.c 
b/arch/hexagon/kernel/hexagon_ksyms.c
index cf8974beb500..b3dbb472572e 100644
--- a/arch/hexagon/kernel/hexagon_ksyms.c
+++ b/arch/hexagon/kernel/hexagon_ksyms.c
@@ -20,7 +20,7 @@ EXPORT_SYMBOL(__vmgetie);
 EXPORT_SYMBOL(__vmsetie);
 EXPORT_SYMBOL(__vmyield);
 EXPORT_SYMBOL(empty_zero_page);
-EXPORT_SYMBOL(ioremap_nocache);
+EXPORT_SYMBOL(ioremap);
 EXPORT_SYMBOL(memcpy);
 EXPORT_SYMBOL(memset);
 
diff --git a/arch/hexagon/mm/ioremap.c b/arch/hexagon/mm/ioremap.c
index 77d8e1e69e9b..b103d83b5fbb 100644
--- a/arch/hexagon/mm/ioremap.c
+++ b/arch/hexagon/mm/ioremap.c
@@ -9,7 +9,7 @@
 #include 
 #include 
 
-void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size)
+void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
 {
unsigned long last_addr, addr;
unsigned long offset = phys_addr & ~PAGE_MASK;
-- 
2.20.1

[PATCH 09/26] alpha: remove the unused __ioremap wrapper

2019-08-17 Thread Christoph Hellwig 
No need for the additional namespace pollution.

Signed-off-by: Christoph Hellwig 
---
 arch/alpha/include/asm/io.h | 6 --
 1 file changed, 6 deletions(-)

diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h
index af2c0063dc75..1989b946a28d 100644
--- a/arch/alpha/include/asm/io.h
+++ b/arch/alpha/include/asm/io.h
@@ -283,12 +283,6 @@ static inline void __iomem *ioremap(unsigned long port, 
unsigned long size)
return IO_CONCAT(__IO_PREFIX,ioremap) (port, size);
 }
 
-static inline void __iomem *__ioremap(unsigned long port, unsigned long size,
- unsigned long flags)
-{
-   return ioremap(port, size);
-}
-
 static inline void __iomem * ioremap_nocache(unsigned long offset,
 unsigned long size)
 {
-- 
2.20.1

[PATCH 14/26] asm-generic: don't provide __ioremap

2019-08-17 Thread Christoph Hellwig 
__ioremap is not a kernel API, but used for helpers with differing
semantics in arch code.  We should not provide it in as-generic.

Signed-off-by: Christoph Hellwig 
---
 include/asm-generic/io.h | 9 -
 1 file changed, 9 deletions(-)

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index b83e2802c969..d02806513670 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -963,15 +963,6 @@ static inline void __iomem *ioremap(phys_addr_t offset, 
size_t size)
 }
 #endif
 
-#ifndef __ioremap
-#define __ioremap __ioremap
-static inline void __iomem *__ioremap(phys_addr_t offset, size_t size,
- unsigned long flags)
-{
-   return ioremap(offset, size);
-}
-#endif
-
 #ifndef iounmap
 #define iounmap iounmap
 
-- 
2.20.1

[PATCH 08/26] m68k: simplify ioremap_nocache

2019-08-17 Thread Christoph Hellwig 
Just define ioremap_nocache to ioremap instead of duplicating the
inline.  Also defined ioremap_uc in terms of ioremap instead of
the using a double indirection.

Signed-off-by: Christoph Hellwig 
---
 arch/m68k/include/asm/kmap.h | 10 ++
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/arch/m68k/include/asm/kmap.h b/arch/m68k/include/asm/kmap.h
index 03d904fe6087..421b6c9c769d 100644
--- a/arch/m68k/include/asm/kmap.h
+++ b/arch/m68k/include/asm/kmap.h
@@ -28,14 +28,8 @@ static inline void __iomem *ioremap(unsigned long physaddr, 
unsigned long size)
return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 }
 
-#define ioremap_nocache ioremap_nocache
-static inline void __iomem *ioremap_nocache(unsigned long physaddr,
-   unsigned long size)
-{
-   return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
-}
-
-#define ioremap_uc ioremap_nocache
+#define ioremap_nocache ioremap
+#define ioremap_uc ioremap
 #define ioremap_wt ioremap_wt
 static inline void __iomem *ioremap_wt(unsigned long physaddr,
   unsigned long size)
-- 
2.20.1

[PATCH 16/26] asm-generic: don't provide ioremap for CONFIG_MMU

2019-08-17 Thread Christoph Hellwig 
All MMU-enabled ports have a non-trivial ioremap and should thus provide
the prototype for their implementation instead of providing a generic
one unless a different symbol is not defined.  Note that this only
affects sparc32 nds32 as all others do provide their own version.

Also update the kerneldoc comments in asm-generic/io.h to explain the
situation around the default ioremap* implementations correctly.

Signed-off-by: Christoph Hellwig 
---
 arch/nds32/include/asm/io.h|  2 ++
 arch/sparc/include/asm/io_32.h |  1 +
 include/asm-generic/io.h   | 29 -
 3 files changed, 11 insertions(+), 21 deletions(-)

diff --git a/arch/nds32/include/asm/io.h b/arch/nds32/include/asm/io.h
index 16f262322b8f..fb0e8a24c7af 100644
--- a/arch/nds32/include/asm/io.h
+++ b/arch/nds32/include/asm/io.h
@@ -6,6 +6,7 @@
 
 #include 
 
+void __iomem *ioremap(phys_addr_t phys_addr, size_t size);
 extern void iounmap(volatile void __iomem *addr);
 #define __raw_writeb __raw_writeb
 static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
@@ -80,4 +81,5 @@ static inline u32 __raw_readl(const volatile void __iomem 
*addr)
 #define writew(v,c)({ __iowmb(); writew_relaxed((v),(c)); })
 #define writel(v,c)({ __iowmb(); writel_relaxed((v),(c)); })
 #include 
+
 #endif /* __ASM_NDS32_IO_H */
diff --git a/arch/sparc/include/asm/io_32.h b/arch/sparc/include/asm/io_32.h
index df2dc1784673..9a52d9506f80 100644
--- a/arch/sparc/include/asm/io_32.h
+++ b/arch/sparc/include/asm/io_32.h
@@ -127,6 +127,7 @@ static inline void sbus_memcpy_toio(volatile void __iomem 
*dst,
  * Bus number may be embedded in the higher bits of the physical address.
  * This is why we have no bus number argument to ioremap().
  */
+void __iomem *ioremap(phys_addr_t offset, size_t size);
 void iounmap(volatile void __iomem *addr);
 /* Create a virtual mapping cookie for an IO port range */
 void __iomem *ioport_map(unsigned long port, unsigned int nr);
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index a98ed6325727..6a5edc23afe2 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -922,28 +922,16 @@ static inline void *phys_to_virt(unsigned long address)
 /**
  * DOC: ioremap() and ioremap_*() variants
  *
- * If you have an IOMMU your architecture is expected to have both ioremap()
- * and iounmap() implemented otherwise the asm-generic helpers will provide a
- * direct mapping.
+ * Architectures with an MMU are expected to provide ioremap() and iounmap()
+ * themselves.  For NOMMU architectures we provide a default nop-op
+ * implementation that expect that the physical address used for MMIO are
+ * already marked as uncached, and can be used as kernel virtual addresses.
  *
- * There are ioremap_*() call variants, if you have no IOMMU we naturally will
- * default to direct mapping for all of them, you can override these defaults.
- * If you have an IOMMU you are highly encouraged to provide your own
- * ioremap variant implementation as there currently is no safe architecture
- * agnostic default. To avoid possible improper behaviour default asm-generic
- * ioremap_*() variants all return NULL when an IOMMU is available. If you've
- * defined your own ioremap_*() variant you must then declare your own
- * ioremap_*() variant as defined to itself to avoid the default NULL return.
+ * ioremap_wc() and ioremap_wt() can provide more relaxed caching attributes
+ * for specific drivers if the architecture choses to implement them.  If they
+ * are not implemented we fall back to plain ioremap.
  */
 #ifndef CONFIG_MMU
-
-/*
- * Change "struct page" to physical address.
- *
- * This implementation is for the no-MMU case only... if you have an MMU
- * you'll need to provide your own definitions.
- */
-
 #ifndef ioremap
 #define ioremap ioremap
 static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
@@ -954,14 +942,13 @@ static inline void __iomem *ioremap(phys_addr_t offset, 
size_t size)
 
 #ifndef iounmap
 #define iounmap iounmap
-
 static inline void iounmap(void __iomem *addr)
 {
 }
 #endif
 #endif /* CONFIG_MMU */
+
 #ifndef ioremap_nocache
-void __iomem *ioremap(phys_addr_t phys_addr, size_t size);
 #define ioremap_nocache ioremap_nocache
 static inline void __iomem *ioremap_nocache(phys_addr_t offset, size_t size)
 {
-- 
2.20.1

[PATCH 17/26] arch: rely on asm-generic/io.h for default ioremap_* definitions

2019-08-17 Thread Christoph Hellwig 
Various architectures that use asm-generic/io.h still defined their
own default versions of ioremap_nocache, ioremap_wt and ioremap_wc
that point back to plain ioremap directly or indirectly.  Remove these
definitions and rely on asm-generic/io.h instead.  For this to work
the backup ioremap_* defintions needs to be changed to purely cpp
macros instea of inlines to cover for architectures like openrisc
that only define ioremap after including .

Signed-off-by: Christoph Hellwig 
---
 arch/arc/include/asm/io.h|  4 
 arch/arm/include/asm/io.h|  1 -
 arch/arm64/include/asm/io.h  |  2 --
 arch/csky/include/asm/io.h   |  4 
 arch/ia64/include/asm/io.h   |  1 -
 arch/microblaze/include/asm/io.h |  3 ---
 arch/nios2/include/asm/io.h  |  4 
 arch/openrisc/include/asm/io.h   |  1 -
 arch/riscv/include/asm/io.h  | 10 --
 arch/s390/include/asm/io.h   |  4 
 arch/x86/include/asm/io.h|  1 -
 arch/xtensa/include/asm/io.h |  4 
 include/asm-generic/io.h | 18 +++---
 13 files changed, 3 insertions(+), 54 deletions(-)

diff --git a/arch/arc/include/asm/io.h b/arch/arc/include/asm/io.h
index 72f7929736f8..8f777d6441a5 100644
--- a/arch/arc/include/asm/io.h
+++ b/arch/arc/include/asm/io.h
@@ -34,10 +34,6 @@ static inline void ioport_unmap(void __iomem *addr)
 
 extern void iounmap(const void __iomem *addr);
 
-#define ioremap_nocache(phy, sz)   ioremap(phy, sz)
-#define ioremap_wc(phy, sz)ioremap(phy, sz)
-#define ioremap_wt(phy, sz)ioremap(phy, sz)
-
 /*
  * io{read,write}{16,32}be() macros
  */
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 924f9dd502ed..aefdabdbeb84 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -392,7 +392,6 @@ static inline void memcpy_toio(volatile void __iomem *to, 
const void *from,
  */
 void __iomem *ioremap(resource_size_t res_cookie, size_t size);
 #define ioremap ioremap
-#define ioremap_nocache ioremap
 
 /*
  * Do not use ioremap_cache for mapping memory. Use memremap instead.
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index 7ed92626949d..a61b1469f7d9 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -169,9 +169,7 @@ 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_nocache(addr, size)__ioremap((addr), (size), 
__pgprot(PROT_DEVICE_nGnRE))
 #define ioremap_wc(addr, size) __ioremap((addr), (size), 
__pgprot(PROT_NORMAL_NC))
-#define ioremap_wt(addr, size) __ioremap((addr), (size), 
__pgprot(PROT_DEVICE_nGnRE))
 #define iounmap__iounmap
 
 /*
diff --git a/arch/csky/include/asm/io.h b/arch/csky/include/asm/io.h
index c1dfa9c10e36..800985af1c44 100644
--- a/arch/csky/include/asm/io.h
+++ b/arch/csky/include/asm/io.h
@@ -40,10 +40,6 @@ extern int remap_area_pages(unsigned long address, 
phys_addr_t phys_addr,
 #define writel(v,c)({ wmb(); writel_relaxed((v),(c)); mb(); })
 #endif
 
-#define ioremap_nocache(phy, sz)   ioremap(phy, sz)
-#define ioremap_wc ioremap_nocache
-#define ioremap_wt ioremap_nocache
-
 #include 
 
 #endif /* __ASM_CSKY_IO_H */
diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h
index febd2c6ea0b4..7faf50e45ac8 100644
--- a/arch/ia64/include/asm/io.h
+++ b/arch/ia64/include/asm/io.h
@@ -419,7 +419,6 @@ static inline void __iomem * ioremap_cache (unsigned long 
phys_addr, unsigned lo
return ioremap(phys_addr, size);
 }
 #define ioremap ioremap
-#define ioremap_nocache ioremap
 #define ioremap_cache ioremap_cache
 #define ioremap_uc ioremap_uc
 #define iounmap iounmap
diff --git a/arch/microblaze/include/asm/io.h b/arch/microblaze/include/asm/io.h
index 86c95b2a1ce1..d33c61737b8b 100644
--- a/arch/microblaze/include/asm/io.h
+++ b/arch/microblaze/include/asm/io.h
@@ -39,9 +39,6 @@ extern resource_size_t isa_mem_base;
 extern void iounmap(volatile void __iomem *addr);
 
 extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
-#define ioremap_nocache(addr, size)ioremap((addr), (size))
-#define ioremap_wc(addr, size) ioremap((addr), (size))
-#define ioremap_wt(addr, size) ioremap((addr), (size))
 
 #endif /* CONFIG_MMU */
 
diff --git a/arch/nios2/include/asm/io.h b/arch/nios2/include/asm/io.h
index 74ab34aa6731..d108937c321e 100644
--- a/arch/nios2/include/asm/io.h
+++ b/arch/nios2/include/asm/io.h
@@ -33,10 +33,6 @@ static inline void iounmap(void __iomem *addr)
__iounmap(addr);
 }
 
-#define ioremap_nocache ioremap
-#define ioremap_wc ioremap
-#define ioremap_wt ioremap
-
 /* Pages to physical address... */
 #define page_to_phys(page) virt_to_phys(page_to_virt(page))
 
diff --git a/arch/openrisc/inc

[PATCH 22/26] sh: remove __iounmap

2019-08-17 Thread Christoph Hellwig 
No need to indirect iounmap for sh.

Signed-off-by: Christoph Hellwig 
---
 arch/sh/include/asm/io.h | 9 ++---
 arch/sh/mm/ioremap.c | 4 ++--
 2 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index ac0561960c52..1495489225ac 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -267,7 +267,7 @@ unsigned long long poke_real_address_q(unsigned long long 
addr,
 #ifdef CONFIG_MMU
 void __iomem *__ioremap_caller(phys_addr_t offset, unsigned long size,
   pgprot_t prot, void *caller);
-void __iounmap(void __iomem *addr);
+void iounmap(void __iomem *addr);
 
 static inline void __iomem *
 __ioremap(phys_addr_t offset, unsigned long size, pgprot_t prot)
@@ -328,7 +328,7 @@ __ioremap_mode(phys_addr_t offset, unsigned long size, 
pgprot_t prot)
 #else
 #define __ioremap(offset, size, prot)  ((void __iomem *)(offset))
 #define __ioremap_mode(offset, size, prot) ((void __iomem *)(offset))
-#define __iounmap(addr)do { } while (0)
+#define iounmap(addr)  do { } while (0)
 #endif /* CONFIG_MMU */
 
 static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
@@ -370,11 +370,6 @@ static inline int iounmap_fixed(void __iomem *addr) { 
return -EINVAL; }
 #define ioremap_nocacheioremap
 #define ioremap_uc ioremap
 
-static inline void iounmap(void __iomem *addr)
-{
-   __iounmap(addr);
-}
-
 /*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  * access
diff --git a/arch/sh/mm/ioremap.c b/arch/sh/mm/ioremap.c
index d09ddfe58fd8..f6d02246d665 100644
--- a/arch/sh/mm/ioremap.c
+++ b/arch/sh/mm/ioremap.c
@@ -103,7 +103,7 @@ static inline int iomapping_nontranslatable(unsigned long 
offset)
return 0;
 }
 
-void __iounmap(void __iomem *addr)
+void iounmap(void __iomem *addr)
 {
unsigned long vaddr = (unsigned long __force)addr;
struct vm_struct *p;
@@ -134,4 +134,4 @@ void __iounmap(void __iomem *addr)
 
kfree(p);
 }
-EXPORT_SYMBOL(__iounmap);
+EXPORT_SYMBOL(iounmap);
-- 
2.20.1

[PATCH 20/26] hexagon: remove __iounmap

2019-08-17 Thread Christoph Hellwig 
No need to indirect iounmap for hexagon.

Signed-off-by: Christoph Hellwig 
---
 arch/hexagon/include/asm/io.h   | 7 +--
 arch/hexagon/kernel/hexagon_ksyms.c | 2 +-
 arch/hexagon/mm/ioremap.c   | 2 +-
 3 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h
index 89537dc1cf97..539e3efcf39c 100644
--- a/arch/hexagon/include/asm/io.h
+++ b/arch/hexagon/include/asm/io.h
@@ -27,7 +27,7 @@
 extern int remap_area_pages(unsigned long start, unsigned long phys_addr,
unsigned long end, unsigned long flags);
 
-extern void __iounmap(const volatile void __iomem *addr);
+extern void iounmap(const volatile void __iomem *addr);
 
 /* Defined in lib/io.c, needed for smc91x driver. */
 extern void __raw_readsw(const void __iomem *addr, void *data, int wordlen);
@@ -175,11 +175,6 @@ void __iomem *ioremap(unsigned long phys_addr, unsigned 
long size);
 #define ioremap_nocache ioremap
 
 
-static inline void iounmap(volatile void __iomem *addr)
-{
-   __iounmap(addr);
-}
-
 #define __raw_writel writel
 
 static inline void memcpy_fromio(void *dst, const volatile void __iomem *src,
diff --git a/arch/hexagon/kernel/hexagon_ksyms.c 
b/arch/hexagon/kernel/hexagon_ksyms.c
index b3dbb472572e..6fb1aaab1c29 100644
--- a/arch/hexagon/kernel/hexagon_ksyms.c
+++ b/arch/hexagon/kernel/hexagon_ksyms.c
@@ -14,7 +14,7 @@
 EXPORT_SYMBOL(__clear_user_hexagon);
 EXPORT_SYMBOL(raw_copy_from_user);
 EXPORT_SYMBOL(raw_copy_to_user);
-EXPORT_SYMBOL(__iounmap);
+EXPORT_SYMBOL(iounmap);
 EXPORT_SYMBOL(__strnlen_user);
 EXPORT_SYMBOL(__vmgetie);
 EXPORT_SYMBOL(__vmsetie);
diff --git a/arch/hexagon/mm/ioremap.c b/arch/hexagon/mm/ioremap.c
index b103d83b5fbb..255c5b1ee1a7 100644
--- a/arch/hexagon/mm/ioremap.c
+++ b/arch/hexagon/mm/ioremap.c
@@ -38,7 +38,7 @@ void __iomem *ioremap(unsigned long phys_addr, unsigned long 
size)
return (void __iomem *) (offset + addr);
 }
 
-void __iounmap(const volatile void __iomem *addr)
+void iounmap(const volatile void __iomem *addr)
 {
vunmap((void *) ((unsigned long) addr & PAGE_MASK));
 }
-- 
2.20.1

[PATCH 26/26] nds32: use generic ioremap

2019-08-17 Thread Christoph Hellwig 
Use the generic ioremap_prot and iounmap helpers.

Note that the io.h include in pgtable.h had to be removed to not create
an include loop.  As far as I can tell there was no need for it to
start with.

Signed-off-by: Christoph Hellwig 
---
 arch/nds32/Kconfig   |  1 +
 arch/nds32/include/asm/io.h  |  3 +-
 arch/nds32/include/asm/pgtable.h |  4 ++-
 arch/nds32/mm/Makefile   |  3 +-
 arch/nds32/mm/ioremap.c  | 62 
 5 files changed, 6 insertions(+), 67 deletions(-)
 delete mode 100644 arch/nds32/mm/ioremap.c

diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig
index fbd68329737f..12c06a833b7c 100644
--- a/arch/nds32/Kconfig
+++ b/arch/nds32/Kconfig
@@ -20,6 +20,7 @@ config NDS32
select GENERIC_CLOCKEVENTS
select GENERIC_IRQ_CHIP
select GENERIC_IRQ_SHOW
+   select GENERIC_IOREMAP
select GENERIC_LIB_ASHLDI3
select GENERIC_LIB_ASHRDI3
select GENERIC_LIB_CMPDI2
diff --git a/arch/nds32/include/asm/io.h b/arch/nds32/include/asm/io.h
index fb0e8a24c7af..e57378d04006 100644
--- a/arch/nds32/include/asm/io.h
+++ b/arch/nds32/include/asm/io.h
@@ -6,8 +6,6 @@
 
 #include 
 
-void __iomem *ioremap(phys_addr_t phys_addr, size_t size);
-extern void iounmap(volatile void __iomem *addr);
 #define __raw_writeb __raw_writeb
 static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
 {
@@ -80,6 +78,7 @@ static inline u32 __raw_readl(const volatile void __iomem 
*addr)
 #define writeb(v,c)({ __iowmb(); writeb_relaxed((v),(c)); })
 #define writew(v,c)({ __iowmb(); writew_relaxed((v),(c)); })
 #define writel(v,c)({ __iowmb(); writel_relaxed((v),(c)); })
+
 #include 
 
 #endif /* __ASM_NDS32_IO_H */
diff --git a/arch/nds32/include/asm/pgtable.h b/arch/nds32/include/asm/pgtable.h
index c70cc56bec09..9c5efa4f1f96 100644
--- a/arch/nds32/include/asm/pgtable.h
+++ b/arch/nds32/include/asm/pgtable.h
@@ -12,7 +12,6 @@
 #include 
 #ifndef __ASSEMBLY__
 #include 
-#include 
 #include 
 #endif
 
@@ -130,6 +129,9 @@ extern void __pgd_error(const char *file, int line, 
unsigned long val);
 #define _PAGE_CACHE_PAGE_C_MEM_WB
 #endif
 
+#define _PAGE_IOREMAP \
+   (_PAGE_V | _PAGE_M_KRW | _PAGE_D | _PAGE_G | _PAGE_C_DEV)
+
 /*
  * + Level 1 descriptor (PMD)
  */
diff --git a/arch/nds32/mm/Makefile b/arch/nds32/mm/Makefile
index bd360e4583b5..897ecaf5cf54 100644
--- a/arch/nds32/mm/Makefile
+++ b/arch/nds32/mm/Makefile
@@ -1,6 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
-obj-y  := extable.o tlb.o \
-  fault.o init.o ioremap.o mmap.o \
+obj-y  := extable.o tlb.o fault.o init.o mmap.o \
mm-nds32.o cacheflush.o proc.o
 
 obj-$(CONFIG_ALIGNMENT_TRAP)   += alignment.o
diff --git a/arch/nds32/mm/ioremap.c b/arch/nds32/mm/ioremap.c
deleted file mode 100644
index 690140bb23a2..
--- a/arch/nds32/mm/ioremap.c
+++ /dev/null
@@ -1,62 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2005-2017 Andes Technology Corporation
-
-#include 
-#include 
-#include 
-#include 
-
-void __iomem *ioremap(phys_addr_t phys_addr, size_t size);
-
-static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size,
- void *caller)
-{
-   struct vm_struct *area;
-   unsigned long addr, offset, last_addr;
-   pgprot_t prot;
-
-   /* Don't allow wraparound or zero size */
-   last_addr = phys_addr + size - 1;
-   if (!size || last_addr < phys_addr)
-   return NULL;
-
-   /*
-* Mappings have to be page-aligned
-*/
-   offset = phys_addr & ~PAGE_MASK;
-   phys_addr &= PAGE_MASK;
-   size = PAGE_ALIGN(last_addr + 1) - phys_addr;
-
-   /*
-* Ok, go for it..
-*/
-   area = get_vm_area_caller(size, VM_IOREMAP, caller);
-   if (!area)
-   return NULL;
-
-   area->phys_addr = phys_addr;
-   addr = (unsigned long)area->addr;
-   prot = __pgprot(_PAGE_V | _PAGE_M_KRW | _PAGE_D |
-   _PAGE_G | _PAGE_C_DEV);
-   if (ioremap_page_range(addr, addr + size, phys_addr, prot)) {
-   vunmap((void *)addr);
-   return NULL;
-   }
-   return (__force void __iomem *)(offset + (char *)addr);
-
-}
-
-void __iomem *ioremap(phys_addr_t phys_addr, size_t size)
-{
-   return __ioremap_caller(phys_addr, size,
-   __builtin_return_address(0));
-}
-
-EXPORT_SYMBOL(ioremap);
-
-void iounmap(volatile void __iomem * addr)
-{
-   vunmap((void *)(PAGE_MASK & (unsigned long)addr));
-}
-
-EXPORT_SYMBOL(iounmap);
-- 
2.20.1

[PATCH 25/26] csky: use generic ioremap

2019-08-17 Thread Christoph Hellwig 
Use the generic ioremap_prot and iounmap helpers.

Signed-off-by: Christoph Hellwig 
---
 arch/csky/Kconfig   |  1 +
 arch/csky/include/asm/io.h  |  7 --
 arch/csky/include/asm/pgtable.h |  4 
 arch/csky/mm/ioremap.c  | 42 -
 4 files changed, 5 insertions(+), 49 deletions(-)

diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 3973847b5f42..da09c884cc30 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -17,6 +17,7 @@ config CSKY
select IRQ_DOMAIN
select HANDLE_DOMAIN_IRQ
select DW_APB_TIMER_OF
+   select GENERIC_IOREMAP
select GENERIC_LIB_ASHLDI3
select GENERIC_LIB_ASHRDI3
select GENERIC_LIB_LSHRDI3
diff --git a/arch/csky/include/asm/io.h b/arch/csky/include/asm/io.h
index 800985af1c44..10e09299c912 100644
--- a/arch/csky/include/asm/io.h
+++ b/arch/csky/include/asm/io.h
@@ -8,13 +8,6 @@
 #include 
 #include 
 
-extern void __iomem *ioremap(phys_addr_t offset, size_t size);
-
-extern void iounmap(void *addr);
-
-extern int remap_area_pages(unsigned long address, phys_addr_t phys_addr,
-   size_t size, unsigned long flags);
-
 /*
  * I/O memory access primitives. Reads are ordered relative to any
  * following Normal memory access. Writes are ordered relative to any prior
diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h
index c429a6f347de..b5f605b9810c 100644
--- a/arch/csky/include/asm/pgtable.h
+++ b/arch/csky/include/asm/pgtable.h
@@ -86,6 +86,10 @@
 #define PAGE_USERIO__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
_CACHE_CACHED)
 
+#define _PAGE_IOREMAP \
+   (_PAGE_PRESENT | __READABLE | __WRITEABLE | _PAGE_GLOBAL | \
+_CACHE_UNCACHED | _PAGE_SO)
+
 #define __P000 PAGE_NONE
 #define __P001 PAGE_READONLY
 #define __P010 PAGE_COPY
diff --git a/arch/csky/mm/ioremap.c b/arch/csky/mm/ioremap.c
index 8473b6bdf512..65614f65ce48 100644
--- a/arch/csky/mm/ioremap.c
+++ b/arch/csky/mm/ioremap.c
@@ -3,50 +3,8 @@
 
 #include 
 #include 
-#include 
 #include 
 
-#include 
-
-void __iomem *ioremap(phys_addr_t addr, size_t size)
-{
-   phys_addr_t last_addr;
-   unsigned long offset, vaddr;
-   struct vm_struct *area;
-   pgprot_t prot;
-
-   last_addr = addr + size - 1;
-   if (!size || last_addr < addr)
-   return NULL;
-
-   offset = addr & (~PAGE_MASK);
-   addr &= PAGE_MASK;
-   size = PAGE_ALIGN(size + offset);
-
-   area = get_vm_area_caller(size, VM_ALLOC, __builtin_return_address(0));
-   if (!area)
-   return NULL;
-
-   vaddr = (unsigned long)area->addr;
-
-   prot = __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE |
-   _PAGE_GLOBAL | _CACHE_UNCACHED | _PAGE_SO);
-
-   if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
-   free_vm_area(area);
-   return NULL;
-   }
-
-   return (void __iomem *)(vaddr + offset);
-}
-EXPORT_SYMBOL(ioremap);
-
-void iounmap(void __iomem *addr)
-{
-   vunmap((void *)((unsigned long)addr & PAGE_MASK));
-}
-EXPORT_SYMBOL(iounmap);
-
 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
  unsigned long size, pgprot_t vma_prot)
 {
-- 
2.20.1

[PATCH 24/26] riscv: use the generic ioremap code

2019-08-17 Thread Christoph Hellwig 
Use the generic ioremap code instead of providing a local version.
Note that this relies on the asm-generic no-op definition of
pgprot_noncached.

Signed-off-by: Christoph Hellwig 
---
 arch/riscv/Kconfig   |  1 +
 arch/riscv/include/asm/io.h  |  3 --
 arch/riscv/include/asm/pgtable.h |  6 +++
 arch/riscv/mm/Makefile   |  1 -
 arch/riscv/mm/ioremap.c  | 84 
 5 files changed, 7 insertions(+), 88 deletions(-)
 delete mode 100644 arch/riscv/mm/ioremap.c

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 59a4727ecd6c..468e7eba8916 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -30,6 +30,7 @@ config RISCV
select GENERIC_STRNLEN_USER
select GENERIC_SMP_IDLE_THREAD
select GENERIC_ATOMIC64 if !64BIT
+   select GENERIC_IOREMAP
select HAVE_ARCH_AUDITSYSCALL
select HAVE_MEMBLOCK_NODE_MAP
select HAVE_DMA_CONTIGUOUS
diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h
index c1de6875cc77..df4c8812ff64 100644
--- a/arch/riscv/include/asm/io.h
+++ b/arch/riscv/include/asm/io.h
@@ -14,9 +14,6 @@
 #include 
 #include 
 
-extern void __iomem *ioremap(phys_addr_t offset, unsigned long size);
-extern void iounmap(volatile void __iomem *addr);
-
 /* Generic IO read/write.  These perform native-endian accesses. */
 #define __raw_writeb __raw_writeb
 static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index a364aba23d55..57be4723626c 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -61,6 +61,12 @@
 
 #define PAGE_TABLE __pgprot(_PAGE_TABLE)
 
+/*
+ * The RISC-V ISA doesn't yet specify how to query or modify PMAs, so we can't
+ * change the properties of memory regions.
+ */
+#define _PAGE_IOREMAP _PAGE_KERNEL
+
 extern pgd_t swapper_pg_dir[];
 
 /* MAP_PRIVATE permissions: xwr (copy-on-write) */
diff --git a/arch/riscv/mm/Makefile b/arch/riscv/mm/Makefile
index 74055e1d6f21..3b3a161feaa0 100644
--- a/arch/riscv/mm/Makefile
+++ b/arch/riscv/mm/Makefile
@@ -8,7 +8,6 @@ endif
 obj-y += init.o
 obj-y += fault.o
 obj-y += extable.o
-obj-y += ioremap.o
 obj-y += cacheflush.o
 obj-y += context.o
 obj-y += sifive_l2_cache.o
diff --git a/arch/riscv/mm/ioremap.c b/arch/riscv/mm/ioremap.c
deleted file mode 100644
index ac621ddb45c0..
--- a/arch/riscv/mm/ioremap.c
+++ /dev/null
@@ -1,84 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * (C) Copyright 1995 1996 Linus Torvalds
- * (C) Copyright 2012 Regents of the University of California
- */
-
-#include 
-#include 
-#include 
-#include 
-
-#include 
-
-/*
- * Remap an arbitrary physical address space into the kernel virtual
- * address space. Needed when the kernel wants to access high addresses
- * directly.
- *
- * NOTE! We need to allow non-page-aligned mappings too: we will obviously
- * have to convert them into an offset in a page-aligned mapping, but the
- * caller shouldn't need to know that small detail.
- */
-static void __iomem *__ioremap_caller(phys_addr_t addr, size_t size,
-   pgprot_t prot, void *caller)
-{
-   phys_addr_t last_addr;
-   unsigned long offset, vaddr;
-   struct vm_struct *area;
-
-   /* Disallow wrap-around or zero size */
-   last_addr = addr + size - 1;
-   if (!size || last_addr < addr)
-   return NULL;
-
-   /* Page-align mappings */
-   offset = addr & (~PAGE_MASK);
-   addr -= offset;
-   size = PAGE_ALIGN(size + offset);
-
-   area = get_vm_area_caller(size, VM_IOREMAP, caller);
-   if (!area)
-   return NULL;
-   vaddr = (unsigned long)area->addr;
-
-   if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
-   free_vm_area(area);
-   return NULL;
-   }
-
-   return (void __iomem *)(vaddr + offset);
-}
-
-/*
- * ioremap -   map bus memory into CPU space
- * @offset:bus address of the memory
- * @size:  size of the resource to map
- *
- * ioremap performs a platform specific sequence of operations to
- * make bus memory CPU accessible via the readb/readw/readl/writeb/
- * writew/writel functions and the other mmio helpers. The returned
- * address is not guaranteed to be usable directly as a virtual
- * address.
- *
- * Must be freed with iounmap.
- */
-void __iomem *ioremap(phys_addr_t offset, unsigned long size)
-{
-   return __ioremap_caller(offset, size, PAGE_KERNEL,
-   __builtin_return_address(0));
-}
-EXPORT_SYMBOL(ioremap);
-
-
-/**
- * iounmap - Free a IO remapping
- * @addr: virtual address from ioremap_*
- *
- * Caller must ensure there is only one unmapping for the same pointer.
- */
-void iounmap(volatile void __iomem *addr)
-{
-   vunmap((void *)((unsigned long)addr & PAGE_MASK));
-}
-EXPORT_SYMBOL(iounmap);
-- 
2.20.1

[PATCH 15/26] asm-generic: ioremap_uc should behave the same with and without MMU

2019-08-17 Thread Christoph Hellwig 
Whatever reason there is for the existence of ioremap_uc, and the fact
that it returns NULL by default on architectures with an MMU applies
equally to nommu architectures, so don't provide different defaults.

In practice the difference is meaningless as the only portable driver
that uses ioremap_uc is atyfb which probably doesn't show up on nommu
devices.

Signed-off-by: Christoph Hellwig 
---
 include/asm-generic/io.h | 36 
 1 file changed, 16 insertions(+), 20 deletions(-)

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index d02806513670..a98ed6325727 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -935,18 +935,7 @@ static inline void *phys_to_virt(unsigned long address)
  * defined your own ioremap_*() variant you must then declare your own
  * ioremap_*() variant as defined to itself to avoid the default NULL return.
  */
-
-#ifdef CONFIG_MMU
-
-#ifndef ioremap_uc
-#define ioremap_uc ioremap_uc
-static inline void __iomem *ioremap_uc(phys_addr_t offset, size_t size)
-{
-   return NULL;
-}
-#endif
-
-#else /* !CONFIG_MMU */
+#ifndef CONFIG_MMU
 
 /*
  * Change "struct page" to physical address.
@@ -980,14 +969,6 @@ static inline void __iomem *ioremap_nocache(phys_addr_t 
offset, size_t size)
 }
 #endif
 
-#ifndef ioremap_uc
-#define ioremap_uc ioremap_uc
-static inline void __iomem *ioremap_uc(phys_addr_t offset, size_t size)
-{
-   return ioremap_nocache(offset, size);
-}
-#endif
-
 #ifndef ioremap_wc
 #define ioremap_wc ioremap_wc
 static inline void __iomem *ioremap_wc(phys_addr_t offset, size_t size)
@@ -1004,6 +985,21 @@ static inline void __iomem *ioremap_wt(phys_addr_t 
offset, size_t size)
 }
 #endif
 
+/*
+ * ioremap_uc is special in that we do require an explicit architecture
+ * implementation.  In general you do now want to use this function in a
+ * driver and use plain ioremap, which is uncached by default.  Similarly
+ * architectures should not implement it unless they have a very good
+ * reason.
+ */
+#ifndef ioremap_uc
+#define ioremap_uc ioremap_uc
+static inline void __iomem *ioremap_uc(phys_addr_t offset, size_t size)
+{
+   return NULL;
+}
+#endif
+
 #ifdef CONFIG_HAS_IOPORT_MAP
 #ifndef CONFIG_GENERIC_IOMAP
 #ifndef ioport_map
-- 
2.20.1

[PATCH 19/26] arm64: remove __iounmap

2019-08-17 Thread Christoph Hellwig 
No need to indirect iounmap for arm64.

Signed-off-by: Christoph Hellwig 
---
 arch/arm64/include/asm/io.h | 3 +--
 arch/arm64/mm/ioremap.c | 4 ++--
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index a61b1469f7d9..1bf5631671c3 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -165,12 +165,11 @@ 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 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 iounmap__iounmap
 
 /*
  * PCI configuration space mapping function.
diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c
index fdb595a5d65f..9be71bee902c 100644
--- a/arch/arm64/mm/ioremap.c
+++ b/arch/arm64/mm/ioremap.c
@@ -69,7 +69,7 @@ void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, 
pgprot_t prot)
 }
 EXPORT_SYMBOL(__ioremap);
 
-void __iounmap(volatile void __iomem *io_addr)
+void iounmap(volatile void __iomem *io_addr)
 {
unsigned long addr = (unsigned long)io_addr & PAGE_MASK;
 
@@ -80,7 +80,7 @@ void __iounmap(volatile void __iomem *io_addr)
if (is_vmalloc_addr((void *)addr))
vunmap((void *)addr);
 }
-EXPORT_SYMBOL(__iounmap);
+EXPORT_SYMBOL(iounmap);
 
 void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size)
 {
-- 
2.20.1

[PATCH 18/26] m68k: rename __iounmap and mark it static

2019-08-17 Thread Christoph Hellwig 
m68k uses __iounmap as the name for an internal helper that is only
used for some CPU types.  Mark it static and give it a better name.

Signed-off-by: Christoph Hellwig 
---
 arch/m68k/include/asm/kmap.h | 1 -
 arch/m68k/mm/kmap.c  | 9 ++---
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/m68k/include/asm/kmap.h b/arch/m68k/include/asm/kmap.h
index 421b6c9c769d..559cb91bede1 100644
--- a/arch/m68k/include/asm/kmap.h
+++ b/arch/m68k/include/asm/kmap.h
@@ -20,7 +20,6 @@ extern void __iomem *__ioremap(unsigned long physaddr, 
unsigned long size,
   int cacheflag);
 #define iounmap iounmap
 extern void iounmap(void __iomem *addr);
-extern void __iounmap(void *addr, unsigned long size);
 
 #define ioremap ioremap
 static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
diff --git a/arch/m68k/mm/kmap.c b/arch/m68k/mm/kmap.c
index 40a3b327da07..4c279cf0bcc8 100644
--- a/arch/m68k/mm/kmap.c
+++ b/arch/m68k/mm/kmap.c
@@ -52,6 +52,7 @@ static inline void free_io_area(void *addr)
 
 #define IO_SIZE(256*1024)
 
+static void __free_io_area(void *addr, unsigned long size);
 static struct vm_struct *iolist;
 
 static struct vm_struct *get_io_area(unsigned long size)
@@ -90,7 +91,7 @@ static inline void free_io_area(void *addr)
if (tmp->addr == addr) {
*p = tmp->next;
/* remove gap added in get_io_area() */
-   __iounmap(tmp->addr, tmp->size - IO_SIZE);
+   __free_io_area(tmp->addr, tmp->size - IO_SIZE);
kfree(tmp);
return;
}
@@ -249,12 +250,13 @@ void iounmap(void __iomem *addr)
 }
 EXPORT_SYMBOL(iounmap);
 
+#ifndef CPU_M68040_OR_M68060_ONLY
 /*
- * __iounmap unmaps nearly everything, so be careful
+ * __free_io_area unmaps nearly everything, so be careful
  * Currently it doesn't free pointer/page tables anymore but this
  * wasn't used anyway and might be added later.
  */
-void __iounmap(void *addr, unsigned long size)
+static void __free_io_area(void *addr, unsigned long size)
 {
unsigned long virtaddr = (unsigned long)addr;
pgd_t *pgd_dir;
@@ -297,6 +299,7 @@ void __iounmap(void *addr, unsigned long size)
 
flush_tlb_all();
 }
+#endif /* CPU_M68040_OR_M68060_ONLY */
 
 /*
  * Set new cache mode for some kernel address space.
-- 
2.20.1

[PATCH 23/26] lib: provide a simple generic ioremap implementation

2019-08-17 Thread Christoph Hellwig 
A lot of architectures reuse the same simple ioremap implementation, so
start lifting the most simple variant to lib/ioremap.c.  It provides
ioremap_prot and iounmap, plus a default ioremap that uses prot_noncached,
although that can be overridden by asm/io.h.

Signed-off-by: Christoph Hellwig 
---
 include/asm-generic/io.h | 20 
 lib/Kconfig  |  3 +++
 lib/ioremap.c| 39 +++
 3 files changed, 58 insertions(+), 4 deletions(-)

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 4e45e1cb6560..4a661fdd1937 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -923,9 +923,10 @@ static inline void *phys_to_virt(unsigned long address)
  * DOC: ioremap() and ioremap_*() variants
  *
  * Architectures with an MMU are expected to provide ioremap() and iounmap()
- * themselves.  For NOMMU architectures we provide a default nop-op
- * implementation that expect that the physical address used for MMIO are
- * already marked as uncached, and can be used as kernel virtual addresses.
+ * themselves or rely on GENERIC_IOREMAP.  For NOMMU architectures we provide
+ * a default nop-op implementation that expect that the physical address used
+ * for MMIO are already marked as uncached, and can be used as kernel virtual
+ * addresses.
  *
  * ioremap_wc() and ioremap_wt() can provide more relaxed caching attributes
  * for specific drivers if the architecture choses to implement them.  If they
@@ -946,7 +947,18 @@ static inline void iounmap(void __iomem *addr)
 {
 }
 #endif
-#endif /* CONFIG_MMU */
+#elif defined(CONFIG_GENERIC_IOREMAP)
+#include 
+
+void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot);
+void iounmap(volatile void __iomem *addr);
+
+static inline void __iomem *ioremap(phys_addr_t addr, size_t size)
+{
+   /* _PAGE_IOREMAP needs to be supplied by the architecture */
+   return ioremap_prot(addr, size, _PAGE_IOREMAP);
+}
+#endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */
 
 #ifndef ioremap_nocache
 #define ioremap_nocache ioremap
diff --git a/lib/Kconfig b/lib/Kconfig
index f33d66fc0e86..5d452e1072ab 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -636,6 +636,9 @@ config STRING_SELFTEST
 
 endmenu
 
+config GENERIC_IOREMAP
+   bool
+
 config GENERIC_LIB_ASHLDI3
bool
 
diff --git a/lib/ioremap.c b/lib/ioremap.c
index 0a2ffadc6d71..3f0e18543de8 100644
--- a/lib/ioremap.c
+++ b/lib/ioremap.c
@@ -231,3 +231,42 @@ int ioremap_page_range(unsigned long addr,
 
return err;
 }
+
+#ifdef CONFIG_GENERIC_IOREMAP
+void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
+{
+   unsigned long offset, vaddr;
+   phys_addr_t last_addr;
+   struct vm_struct *area;
+
+   /* Disallow wrap-around or zero size */
+   last_addr = addr + size - 1;
+   if (!size || last_addr < addr)
+   return NULL;
+
+   /* Page-align mappings */
+   offset = addr & (~PAGE_MASK);
+   addr -= offset;
+   size = PAGE_ALIGN(size + offset);
+
+   area = get_vm_area_caller(size, VM_IOREMAP,
+   __builtin_return_address(0));
+   if (!area)
+   return NULL;
+   vaddr = (unsigned long)area->addr;
+
+   if (ioremap_page_range(vaddr, vaddr + size, addr, __pgprot(prot))) {
+   free_vm_area(area);
+   return NULL;
+   }
+
+   return (void __iomem *)(vaddr + offset);
+}
+EXPORT_SYMBOL(ioremap_prot);
+
+void iounmap(volatile void __iomem *addr)
+{
+   vunmap((void *)((unsigned long)addr & PAGE_MASK));
+}
+EXPORT_SYMBOL(iounmap);
+#endif /* CONFIG_GENERIC_IOREMAP */
-- 
2.20.1

[PATCH 21/26] nios2: remove __iounmap

2019-08-17 Thread Christoph Hellwig 
No need to indirect iounmap for nios2.

Signed-off-by: Christoph Hellwig 
---
 arch/nios2/include/asm/io.h | 7 +--
 arch/nios2/mm/ioremap.c | 6 +++---
 2 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/arch/nios2/include/asm/io.h b/arch/nios2/include/asm/io.h
index d108937c321e..746853ac7d8d 100644
--- a/arch/nios2/include/asm/io.h
+++ b/arch/nios2/include/asm/io.h
@@ -26,12 +26,7 @@
 #define writel_relaxed(x, addr)writel(x, addr)
 
 void __iomem *ioremap(unsigned long physaddr, unsigned long size);
-extern void __iounmap(void __iomem *addr);
-
-static inline void iounmap(void __iomem *addr)
-{
-   __iounmap(addr);
-}
+void iounmap(void __iomem *addr);
 
 /* Pages to physical address... */
 #define page_to_phys(page) virt_to_phys(page_to_virt(page))
diff --git a/arch/nios2/mm/ioremap.c b/arch/nios2/mm/ioremap.c
index 7a1a27f3daa3..b56af759dcdf 100644
--- a/arch/nios2/mm/ioremap.c
+++ b/arch/nios2/mm/ioremap.c
@@ -157,11 +157,11 @@ void __iomem *ioremap(unsigned long phys_addr, unsigned 
long size)
 EXPORT_SYMBOL(ioremap);
 
 /*
- * __iounmap unmaps nearly everything, so be careful
+ * iounmap unmaps nearly everything, so be careful
  * it doesn't free currently pointer/page tables anymore but it
  * wasn't used anyway and might be added later.
  */
-void __iounmap(void __iomem *addr)
+void iounmap(void __iomem *addr)
 {
struct vm_struct *p;
 
@@ -173,4 +173,4 @@ void __iounmap(void __iomem *addr)
pr_err("iounmap: bad address %p\n", addr);
kfree(p);
 }
-EXPORT_SYMBOL(__iounmap);
+EXPORT_SYMBOL(iounmap);
-- 
2.20.1

Re: [PATCH 12/26] x86: clean up ioremap

2019-08-17 Thread Ingo Molnar 


* Christoph Hellwig  wrote:

> Use ioremap as the main implemented function, and defined
> ioremap_nocache to it as a deprecated alias.
> 
> Signed-off-by: Christoph Hellwig 
> ---
>  arch/x86/include/asm/io.h | 8 ++--
>  arch/x86/mm/ioremap.c | 8 
>  arch/x86/mm/pageattr.c| 4 ++--
>  3 files changed, 8 insertions(+), 12 deletions(-)

Acked-by: Ingo Molnar 

Thanks,

Ingo

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Re: [PATCH 06/26] ia64: rename ioremap_nocache to ioremap_uc

2019-08-17 Thread Sergei Shtylyov 

Hello!

On 17.08.2019 10:32, Christoph Hellwig wrote:


On ia64 ioremap_nocache fails if attributs don't match.  Not other


   Attributes. :-)


architectures does this, and we plan to get rid of ioremap_nocache.
So get rid of the special semantics and define ioremap_nocache in
terms of ioremap as no portable driver could rely on the behavior
anyway.

However x86 implements ioremap_uc with a in a similar way as the ia64


   "With a" not really needed?


version of ioremap_nocache, so implement that instead.

Signed-off-by: Christoph Hellwig 

[...]

MBR, Sergei

Re: [PATCH 14/26] asm-generic: don't provide __ioremap

2019-08-17 Thread Paul Walmsley 
On Sat, 17 Aug 2019, Christoph Hellwig wrote:

> __ioremap is not a kernel API, but used for helpers with differing
> semantics in arch code.  We should not provide it in as-generic.
> 
> Signed-off-by: Christoph Hellwig 

Reviewed-by: Paul Walmsley 
Tested-by: Paul Walmsley  # rv32, rv64 boot
Acked-by: Paul Walmsley  # arch/riscv


- Paul

Re: [PATCH 15/26] asm-generic: ioremap_uc should behave the same with and without MMU

2019-08-17 Thread Paul Walmsley 
On Sat, 17 Aug 2019, Christoph Hellwig wrote:

> Whatever reason there is for the existence of ioremap_uc, and the fact 
> that it returns NULL by default on architectures with an MMU applies 
> equally to nommu architectures, so don't provide different defaults.
> 
> In practice the difference is meaningless as the only portable driver
> that uses ioremap_uc is atyfb which probably doesn't show up on nommu
> devices.
> 
> Signed-off-by: Christoph Hellwig 

[ ... ]

> diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> index d02806513670..a98ed6325727 100644
> --- a/include/asm-generic/io.h
> +++ b/include/asm-generic/io.h

[ ... ]

> @@ -1004,6 +985,21 @@ static inline void __iomem *ioremap_wt(phys_addr_t 
> offset, size_t size)
>  }
>  #endif
>  
> +/*
> + * ioremap_uc is special in that we do require an explicit architecture
> + * implementation.  In general you do now want to use this function in a
 ^^^ not

> + * driver and use plain ioremap, which is uncached by default.  Similarly
^ instead 

> + * architectures should not implement it unless they have a very good
> + * reason.
> + */

Looks like this mess is only needed on x86 with certain graphics drivers 
and conflicts between MTRR and page table-based MMU attributes.


Reviewed-by: Paul Walmsley 
Tested-by: Paul Walmsley  # rv32, rv64 boot


- Paul

Re: [PATCH 17/26] arch: rely on asm-generic/io.h for default ioremap_* definitions

2019-08-17 Thread Paul Walmsley 
On Sat, 17 Aug 2019, Christoph Hellwig wrote:

> Various architectures that use asm-generic/io.h still defined their
> own default versions of ioremap_nocache, ioremap_wt and ioremap_wc
> that point back to plain ioremap directly or indirectly.  Remove these
> definitions and rely on asm-generic/io.h instead.  For this to work
> the backup ioremap_* defintions needs to be changed to purely cpp
> macros instea of inlines to cover for architectures like openrisc
> that only define ioremap after including .
> 
> Signed-off-by: Christoph Hellwig 

Reviewed-by: Paul Walmsley 
Tested-by: Paul Walmsley  # rv32, rv64 boot
Acked-by: Paul Walmsley  # arch/riscv


- Paul

Re: [PATCH 16/26] asm-generic: don't provide ioremap for CONFIG_MMU

2019-08-17 Thread Paul Walmsley 
On Sat, 17 Aug 2019, Christoph Hellwig wrote:

> All MMU-enabled ports have a non-trivial ioremap and should thus provide
> the prototype for their implementation instead of providing a generic
> one unless a different symbol is not defined.  Note that this only
> affects sparc32 nds32 as all others do provide their own version.
> 
> Also update the kerneldoc comments in asm-generic/io.h to explain the
> situation around the default ioremap* implementations correctly.
> 
> Signed-off-by: Christoph Hellwig 
> ---
>  arch/nds32/include/asm/io.h|  2 ++
>  arch/sparc/include/asm/io_32.h |  1 +
>  include/asm-generic/io.h   | 29 -
>  3 files changed, 11 insertions(+), 21 deletions(-)
> 

[ ... ]

> diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> index a98ed6325727..6a5edc23afe2 100644
> --- a/include/asm-generic/io.h
> +++ b/include/asm-generic/io.h
> @@ -922,28 +922,16 @@ static inline void *phys_to_virt(unsigned long address)
>  /**
>   * DOC: ioremap() and ioremap_*() variants
>   *
> - * If you have an IOMMU your architecture is expected to have both ioremap()
> - * and iounmap() implemented otherwise the asm-generic helpers will provide a
> - * direct mapping.
> + * Architectures with an MMU are expected to provide ioremap() and iounmap()
> + * themselves.  For NOMMU architectures we provide a default nop-op
> + * implementation that expect that the physical address used for MMIO are
> + * already marked as uncached, and can be used as kernel virtual addresses.
>   *
> - * There are ioremap_*() call variants, if you have no IOMMU we naturally 
> will
> - * default to direct mapping for all of them, you can override these 
> defaults.
> - * If you have an IOMMU you are highly encouraged to provide your own
> - * ioremap variant implementation as there currently is no safe architecture
> - * agnostic default. To avoid possible improper behaviour default asm-generic
> - * ioremap_*() variants all return NULL when an IOMMU is available. If you've
> - * defined your own ioremap_*() variant you must then declare your own
> - * ioremap_*() variant as defined to itself to avoid the default NULL return.
> + * ioremap_wc() and ioremap_wt() can provide more relaxed caching attributes
> + * for specific drivers if the architecture choses to implement them.  If 
> they
   ^^^ chooses



- Paul

Re: [PATCH 24/26] riscv: use the generic ioremap code

2019-08-17 Thread Paul Walmsley 
On Sat, 17 Aug 2019, Christoph Hellwig wrote:

> Use the generic ioremap code instead of providing a local version.
> Note that this relies on the asm-generic no-op definition of
> pgprot_noncached.
> 
> Signed-off-by: Christoph Hellwig 
> ---
>  arch/riscv/Kconfig   |  1 +
>  arch/riscv/include/asm/io.h  |  3 --
>  arch/riscv/include/asm/pgtable.h |  6 +++
>  arch/riscv/mm/Makefile   |  1 -
>  arch/riscv/mm/ioremap.c  | 84 
>  5 files changed, 7 insertions(+), 88 deletions(-)
>  delete mode 100644 arch/riscv/mm/ioremap.c

Reviewed-by: Paul Walmsley 
Tested-by: Paul Walmsley  # rv32, rv64 boot
Acked-by: Paul Walmsley  # arch/riscv


- Paul

Re: [PATCH 14/26] asm-generic: don't provide __ioremap

2019-08-17 Thread Paul Walmsley 
On Sat, 17 Aug 2019, Paul Walmsley wrote:

> Acked-by: Paul Walmsley  # arch/riscv

This ack is superfluous since the patch doesn't touch arch/riscv; feel 
free to drop it


- Paul