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* generic ioremap (and lots of cleanups) v3
@ 2019-10-29  6:48 Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 01/21] arm: remove ioremap_cached Christoph Hellwig
                   ` (22 more replies)
  0 siblings, 23 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

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.

Note that there is no good tree this would fit, which means I'd set up
a tree to it to Linus unless someone has a better idea.

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

Changes since v2:
 - fix various typos
 - move the m68k __free_io_area around instead of introducing a forward
   declaration

Changes since v1:
 - dropped various patches already merged
 - keep the parts of the parisc EISA hack that are still needed

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 01/21] arm: remove ioremap_cached
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-11-11 10:33   ` Arnd Bergmann
  2019-10-29  6:48 ` [PATCH 02/21] unicore32: " Christoph Hellwig
                   ` (21 subsequent siblings)
  22 siblings, 1 reply; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

No users of ioremap_cached are left, remove it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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 ----
 4 files changed, 1 insertion(+), 15 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 48c2888297dd..5d0d0f86e790 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)
 {
-- 
2.20.1


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 02/21] unicore32: remove ioremap_cached
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 01/21] arm: remove ioremap_cached Christoph Hellwig
@ 2019-10-29  6:48 ` " Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 03/21] ia64: rename ioremap_nocache to ioremap_uc Christoph Hellwig
                   ` (20 subsequent siblings)
  22 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

No users of ioremap_cached are left, remove it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/unicore32/include/asm/io.h | 4 +---
 arch/unicore32/mm/ioremap.c     | 8 --------
 2 files changed, 1 insertion(+), 11 deletions(-)

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 <asm-generic/io.h>
 
 /*
- * __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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 03/21] ia64: rename ioremap_nocache to ioremap_uc
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 01/21] arm: remove ioremap_cached Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 02/21] unicore32: " Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-11-11 10:36   ` Arnd Bergmann
  2019-10-29  6:48 ` [PATCH 04/21] hexagon: clean up ioremap Christoph Hellwig
                   ` (19 subsequent siblings)
  22 siblings, 1 reply; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

On ia64 ioremap_nocache fails if attributes 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 in a similar way as the ia64
version of ioremap_nocache, in that it ignores the firmware tables.
Switch ia64 to override ioremap_uc instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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 54e70c21352a..fec9df9609ed 100644
--- a/arch/ia64/include/asm/io.h
+++ b/arch/ia64/include/asm/io.h
@@ -256,16 +256,16 @@ static inline void outsl(unsigned long port, const void *src,
 # 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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 04/21] hexagon: clean up ioremap
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (2 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 03/21] ia64: rename ioremap_nocache to ioremap_uc Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 05/21] alpha: remove the unused __ioremap wrapper Christoph Hellwig
                   ` (18 subsequent siblings)
  22 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

Use ioremap as the main implemented function, and defined
ioremap_nocache to it as a deprecated alias.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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 <linux/vmalloc.h>
 #include <linux/mm.h>
 
-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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 05/21] alpha: remove the unused __ioremap wrapper
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (3 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 04/21] hexagon: clean up ioremap Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 06/21] nios2: remove __ioremap Christoph Hellwig
                   ` (17 subsequent siblings)
  22 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

No need for the additional namespace pollution.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 06/21] nios2: remove __ioremap
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (4 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 05/21] alpha: remove the unused __ioremap wrapper Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 07/21] parisc: " Christoph Hellwig
                   ` (16 subsequent siblings)
  22 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

The cacheflag argument to __ioremap is always 0, so just implement
ioremap directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 07/21] parisc: remove __ioremap
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (5 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 06/21] nios2: remove __ioremap Christoph Hellwig
@ 2019-10-29  6:48 ` " Christoph Hellwig
  2019-11-05 14:29   ` Helge Deller
  2019-10-29  6:48 ` [PATCH 08/21] x86: Clean up ioremap() Christoph Hellwig
                   ` (15 subsequent siblings)
  22 siblings, 1 reply; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

__ioremap is always called with the _PAGE_NO_CACHE, so fold the whole
thing and rename it to ioremap.  This also allows to remove the special
EISA quirk to force _PAGE_NO_CACHE.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/parisc/include/asm/io.h | 11 +----------
 arch/parisc/mm/ioremap.c     | 10 ++++------
 2 files changed, 5 insertions(+), 16 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 f29f682352f0..6e7c005aa09b 100644
--- a/arch/parisc/mm/ioremap.c
+++ b/arch/parisc/mm/ioremap.c
@@ -25,7 +25,7 @@
  * 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;
@@ -36,10 +36,8 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l
 	unsigned long end = phys_addr + size - 1;
 	/* Support EISA addresses */
 	if ((phys_addr >= 0x00080000 && end < 0x000fffff) ||
-	    (phys_addr >= 0x00500000 && end < 0x03bfffff)) {
+	    (phys_addr >= 0x00500000 && end < 0x03bfffff))
 		phys_addr |= F_EXTEND(0xfc000000);
-		flags |= _PAGE_NO_CACHE;
-	}
 #endif
 
 	/* Don't allow wraparound or zero size */
@@ -65,7 +63,7 @@ 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 +88,7 @@ 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 *io_addr)
 {
-- 
2.20.1


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 08/21] x86: Clean up ioremap()
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (6 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 07/21] parisc: " Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-10-30 10:39   ` Thomas Gleixner
  2019-10-29  6:48 ` [PATCH 09/21] xtensa: clean up ioremap Christoph Hellwig
                   ` (14 subsequent siblings)
  22 siblings, 1 reply; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

Use ioremap() as the main implemented function, and defines
ioremap_nocache() as a deprecated alias of ioremap() in
preparation of removing ioremap_nocache() entirely.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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 a39dcdb5ae34..7985233dfb8d 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -280,11 +280,11 @@ __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
@@ -300,7 +300,7 @@ __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:
@@ -315,7 +315,7 @@ 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 0d09cc5aad61..1b99ad05b117 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -1784,7 +1784,7 @@ 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.
@@ -1799,7 +1799,7 @@ 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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 09/21] xtensa: clean up ioremap
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (7 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 08/21] x86: Clean up ioremap() Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 10/21] asm-generic: ioremap_uc should behave the same with and without MMU Christoph Hellwig
                   ` (13 subsequent siblings)
  22 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

Use ioremap as the main implemented function, and defined
ioremap_nocache to it as a deprecated alias.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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 988e08530a5c..441fb56926a7 100644
--- a/arch/xtensa/include/asm/io.h
+++ b/arch/xtensa/include/asm/io.h
@@ -32,8 +32,7 @@ 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)
@@ -52,15 +51,10 @@ 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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 10/21] asm-generic: ioremap_uc should behave the same with and without MMU
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (8 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 09/21] xtensa: clean up ioremap Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-11-06 17:56   ` Palmer Dabbelt
  2019-11-11 10:09   ` Arnd Bergmann
  2019-10-29  6:48 ` [PATCH 11/21] asm-generic: don't provide ioremap for CONFIG_MMU Christoph Hellwig
                   ` (12 subsequent siblings)
  22 siblings, 2 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

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 <hch@lst.de>
---
 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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 11/21] asm-generic: don't provide ioremap for CONFIG_MMU
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (9 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 10/21] asm-generic: ioremap_uc should behave the same with and without MMU Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-11-06 18:11   ` Palmer Dabbelt
  2019-11-11 10:29   ` Arnd Bergmann
  2019-10-29  6:48 ` [PATCH 12/21] arch: rely on asm-generic/io.h for default ioremap_* definitions Christoph Hellwig
                   ` (11 subsequent siblings)
  22 siblings, 2 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

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 <hch@lst.de>
---
 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 <linux/types.h>
 
+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 <asm-generic/io.h>
+
 #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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 12/21] arch: rely on asm-generic/io.h for default ioremap_* definitions
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (10 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 11/21] asm-generic: don't provide ioremap for CONFIG_MMU Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-11-07 15:29   ` Palmer Dabbelt
  2019-11-11 10:10   ` Arnd Bergmann
  2019-10-29  6:48 ` [PATCH 13/21] m68k: rename __iounmap and mark it static Christoph Hellwig
                   ` (10 subsequent siblings)
  22 siblings, 2 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

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 <asm-generic/io.h>.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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       |  1 -
 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(+), 51 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 323cb306bd28..4e531f57147d 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -167,9 +167,7 @@ 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))
 
 /*
  * PCI configuration space mapping function.
diff --git a/arch/csky/include/asm/io.h b/arch/csky/include/asm/io.h
index 80d071e2567f..a4b9fb616faa 100644
--- a/arch/csky/include/asm/io.h
+++ b/arch/csky/include/asm/io.h
@@ -42,7 +42,6 @@ extern void iounmap(void *addr);
 
 #define ioremap(addr, size)		__ioremap((addr), (size), pgprot_noncached(PAGE_KERNEL))
 #define ioremap_wc(addr, size)		__ioremap((addr), (size), pgprot_writecombine(PAGE_KERNEL))
-#define ioremap_nocache(addr, size)	ioremap((addr), (size))
 #define ioremap_cache			ioremap_cache
 
 #include <asm-generic/io.h>
diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h
index fec9df9609ed..3d666a11a2de 100644
--- a/arch/ia64/include/asm/io.h
+++ b/arch/ia64/include/asm/io.h
@@ -263,7 +263,6 @@ 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/include/asm/io.h b/arch/openrisc/include/asm/io.h
index 5b81a96ab85e..e18f038b2a6d 100644
--- a/arch/openrisc/include/asm/io.h
+++ b/arch/openrisc/include/asm/io.h
@@ -25,7 +25,6 @@
 #define PIO_OFFSET		0
 #define PIO_MASK		0
 
-#define ioremap_nocache ioremap
 #include <asm-generic/io.h>
 #include <asm/pgtable.h>
 
diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h
index fc1189ad3777..c1de6875cc77 100644
--- a/arch/riscv/include/asm/io.h
+++ b/arch/riscv/include/asm/io.h
@@ -15,16 +15,6 @@
 #include <asm/mmiowb.h>
 
 extern void __iomem *ioremap(phys_addr_t offset, unsigned long size);
-
-/*
- * The RISC-V ISA doesn't yet specify how to query or modify PMAs, so we can't
- * change the properties of memory regions.  This should be fixed by the
- * upcoming platform spec.
- */
-#define ioremap_nocache(addr, size) ioremap((addr), (size))
-#define ioremap_wc(addr, size) ioremap((addr), (size))
-#define ioremap_wt(addr, size) ioremap((addr), (size))
-
 extern void iounmap(volatile void __iomem *addr);
 
 /* Generic IO read/write.  These perform native-endian accesses. */
diff --git a/arch/s390/include/asm/io.h b/arch/s390/include/asm/io.h
index ca421614722f..5a16f500515a 100644
--- a/arch/s390/include/asm/io.h
+++ b/arch/s390/include/asm/io.h
@@ -26,10 +26,6 @@ void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);
 
 #define IO_SPACE_LIMIT 0
 
-#define ioremap_nocache(addr, size)	ioremap(addr, size)
-#define ioremap_wc			ioremap_nocache
-#define ioremap_wt			ioremap_nocache
-
 void __iomem *ioremap(unsigned long offset, unsigned long size);
 void iounmap(volatile void __iomem *addr);
 
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 6b5cc41319a7..9997521fc5cd 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -205,7 +205,6 @@ extern void __iomem *ioremap_encrypted(resource_size_t phys_addr, unsigned long
  */
 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/xtensa/include/asm/io.h b/arch/xtensa/include/asm/io.h
index 441fb56926a7..54188e69b988 100644
--- a/arch/xtensa/include/asm/io.h
+++ b/arch/xtensa/include/asm/io.h
@@ -52,10 +52,6 @@ static inline void __iomem *ioremap_cache(unsigned long offset,
 }
 #define ioremap_cache ioremap_cache
 
-#define ioremap_nocache ioremap
-#define ioremap_wc ioremap
-#define ioremap_wt ioremap
-
 static inline void iounmap(volatile void __iomem *addr)
 {
 	unsigned long va = (unsigned long) addr;
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 6a5edc23afe2..4e45e1cb6560 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -949,27 +949,15 @@ static inline void iounmap(void __iomem *addr)
 #endif /* CONFIG_MMU */
 
 #ifndef ioremap_nocache
-#define ioremap_nocache ioremap_nocache
-static inline void __iomem *ioremap_nocache(phys_addr_t offset, size_t size)
-{
-	return ioremap(offset, size);
-}
+#define ioremap_nocache ioremap
 #endif
 
 #ifndef ioremap_wc
-#define ioremap_wc ioremap_wc
-static inline void __iomem *ioremap_wc(phys_addr_t offset, size_t size)
-{
-	return ioremap_nocache(offset, size);
-}
+#define ioremap_wc ioremap
 #endif
 
 #ifndef ioremap_wt
-#define ioremap_wt ioremap_wt
-static inline void __iomem *ioremap_wt(phys_addr_t offset, size_t size)
-{
-	return ioremap_nocache(offset, size);
-}
+#define ioremap_wt ioremap
 #endif
 
 /*
-- 
2.20.1


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 13/21] m68k: rename __iounmap and mark it static
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (11 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 12/21] arch: rely on asm-generic/io.h for default ioremap_* definitions Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-10-30  8:51   ` Geert Uytterhoeven
  2019-10-29  6:48 ` [PATCH 14/21] hexagon: remove __iounmap Christoph Hellwig
                   ` (9 subsequent siblings)
  22 siblings, 1 reply; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

m68k uses __iounmap as the name for an internal helper that is only
used for some CPU types.  Mark it static, give it a better name
and move it around a bit to avoid a forward declaration.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/m68k/include/asm/kmap.h |   1 -
 arch/m68k/mm/kmap.c          | 100 +++++++++++++++++------------------
 2 files changed, 50 insertions(+), 51 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..23f9466aabb5 100644
--- a/arch/m68k/mm/kmap.c
+++ b/arch/m68k/mm/kmap.c
@@ -54,6 +54,55 @@ static inline void free_io_area(void *addr)
 
 static struct vm_struct *iolist;
 
+/*
+ * __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.
+ */
+static void __free_io_area(void *addr, unsigned long size)
+{
+	unsigned long virtaddr = (unsigned long)addr;
+	pgd_t *pgd_dir;
+	pmd_t *pmd_dir;
+	pte_t *pte_dir;
+
+	while ((long)size > 0) {
+		pgd_dir = pgd_offset_k(virtaddr);
+		if (pgd_bad(*pgd_dir)) {
+			printk("iounmap: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
+			pgd_clear(pgd_dir);
+			return;
+		}
+		pmd_dir = pmd_offset(pgd_dir, virtaddr);
+
+		if (CPU_IS_020_OR_030) {
+			int pmd_off = (virtaddr/PTRTREESIZE) & 15;
+			int pmd_type = pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK;
+
+			if (pmd_type == _PAGE_PRESENT) {
+				pmd_dir->pmd[pmd_off] = 0;
+				virtaddr += PTRTREESIZE;
+				size -= PTRTREESIZE;
+				continue;
+			} else if (pmd_type == 0)
+				continue;
+		}
+
+		if (pmd_bad(*pmd_dir)) {
+			printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
+			pmd_clear(pmd_dir);
+			return;
+		}
+		pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
+
+		pte_val(*pte_dir) = 0;
+		virtaddr += PAGE_SIZE;
+		size -= PAGE_SIZE;
+	}
+
+	flush_tlb_all();
+}
+
 static struct vm_struct *get_io_area(unsigned long size)
 {
 	unsigned long addr;
@@ -90,7 +139,7 @@ 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;
 		}
@@ -249,55 +298,6 @@ void iounmap(void __iomem *addr)
 }
 EXPORT_SYMBOL(iounmap);
 
-/*
- * __iounmap 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)
-{
-	unsigned long virtaddr = (unsigned long)addr;
-	pgd_t *pgd_dir;
-	pmd_t *pmd_dir;
-	pte_t *pte_dir;
-
-	while ((long)size > 0) {
-		pgd_dir = pgd_offset_k(virtaddr);
-		if (pgd_bad(*pgd_dir)) {
-			printk("iounmap: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
-			pgd_clear(pgd_dir);
-			return;
-		}
-		pmd_dir = pmd_offset(pgd_dir, virtaddr);
-
-		if (CPU_IS_020_OR_030) {
-			int pmd_off = (virtaddr/PTRTREESIZE) & 15;
-			int pmd_type = pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK;
-
-			if (pmd_type == _PAGE_PRESENT) {
-				pmd_dir->pmd[pmd_off] = 0;
-				virtaddr += PTRTREESIZE;
-				size -= PTRTREESIZE;
-				continue;
-			} else if (pmd_type == 0)
-				continue;
-		}
-
-		if (pmd_bad(*pmd_dir)) {
-			printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
-			pmd_clear(pmd_dir);
-			return;
-		}
-		pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
-
-		pte_val(*pte_dir) = 0;
-		virtaddr += PAGE_SIZE;
-		size -= PAGE_SIZE;
-	}
-
-	flush_tlb_all();
-}
-
 /*
  * Set new cache mode for some kernel address space.
  * The caller must push data for that range itself, if such data may already
-- 
2.20.1


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 14/21] hexagon: remove __iounmap
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (12 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 13/21] m68k: rename __iounmap and mark it static Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 15/21] nios2: " Christoph Hellwig
                   ` (8 subsequent siblings)
  22 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

No need to indirect iounmap for hexagon.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 15/21] nios2: remove __iounmap
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (13 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 14/21] hexagon: remove __iounmap Christoph Hellwig
@ 2019-10-29  6:48 ` " Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 16/21] sh: " Christoph Hellwig
                   ` (7 subsequent siblings)
  22 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

No need to indirect iounmap for nios2.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 16/21] sh: remove __iounmap
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (14 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 15/21] nios2: " Christoph Hellwig
@ 2019-10-29  6:48 ` " Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 17/21] lib: provide a simple generic ioremap implementation Christoph Hellwig
                   ` (6 subsequent siblings)
  22 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

No need to indirect iounmap for sh.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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_nocache	ioremap
 #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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 17/21] lib: provide a simple generic ioremap implementation
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (15 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 16/21] sh: " Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-11-07 15:29   ` Palmer Dabbelt
  2019-11-11 10:10   ` Arnd Bergmann
  2019-10-29  6:48 ` [PATCH 18/21] riscv: use the generic ioremap code Christoph Hellwig
                   ` (5 subsequent siblings)
  22 siblings, 2 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

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 <hch@lst.de>
---
 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 <asm/pgtable.h>
+
+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 183f92a297ca..afc78aaf2b25 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -638,6 +638,9 @@ 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


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http://lists.infradead.org/mailman/listinfo/linux-snps-arc

^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 18/21] riscv: use the generic ioremap code
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (16 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 17/21] lib: provide a simple generic ioremap implementation Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 19/21] nds32: use generic ioremap Christoph Hellwig
                   ` (4 subsequent siblings)
  22 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, Paul Walmsley, linux-mips,
	linux-kernel, linux-m68k, openrisc, linux-mtd, linux-alpha,
	sparclinux, nios2-dev, linux-riscv, linux-snps-arc,
	linux-arm-kernel

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 <hch@lst.de>
Reviewed-by: Paul Walmsley <paul.walmsley@sifive.com>
Tested-by: Paul Walmsley <paul.walmsley@sifive.com> # rv32, rv64 boot
Acked-by: Paul Walmsley <paul.walmsley@sifive.com> # arch/riscv
---
 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 8eebbc8860bb..a02e91ed747a 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_ASM_MODVERSIONS
 	select HAVE_MEMBLOCK_NODE_MAP
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 <linux/types.h>
 #include <asm/mmiowb.h>
 
-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 0352f20c29f4..9fd8a6b27670 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 9d9a17335686..b3a356c80c1f 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..000000000000
--- 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 <linux/export.h>
-#include <linux/mm.h>
-#include <linux/vmalloc.h>
-#include <linux/io.h>
-
-#include <asm/pgtable.h>
-
-/*
- * 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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 19/21] nds32: use generic ioremap
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (17 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 18/21] riscv: use the generic ioremap code Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-11-12  8:51   ` Greentime Hu
  2019-10-29  6:48 ` [PATCH 20/21] csky: remove ioremap_cache Christoph Hellwig
                   ` (3 subsequent siblings)
  22 siblings, 1 reply; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

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 <hch@lst.de>
---
 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 <linux/types.h>
 
-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 <asm-generic/io.h>
 
 #endif /* __ASM_NDS32_IO_H */
diff --git a/arch/nds32/include/asm/pgtable.h b/arch/nds32/include/asm/pgtable.h
index 0588ec99725c..6fbf251cfc26 100644
--- a/arch/nds32/include/asm/pgtable.h
+++ b/arch/nds32/include/asm/pgtable.h
@@ -12,7 +12,6 @@
 #include <asm/nds32.h>
 #ifndef __ASSEMBLY__
 #include <asm/fixmap.h>
-#include <asm/io.h>
 #include <nds32_intrinsic.h>
 #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..000000000000
--- 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 <linux/vmalloc.h>
-#include <linux/io.h>
-#include <linux/mm.h>
-#include <asm/pgtable.h>
-
-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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 20/21] csky: remove ioremap_cache
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (18 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 19/21] nds32: use generic ioremap Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-10-29  6:48 ` [PATCH 21/21] csky: use generic ioremap Christoph Hellwig
                   ` (2 subsequent siblings)
  22 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

No driver that can be used on csky uses ioremap_cache, and this
interface has been deprecated in favor of memremap.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Guo Ren <guoren@kernel.org>
---
 arch/csky/include/asm/io.h | 2 --
 arch/csky/mm/ioremap.c     | 7 -------
 2 files changed, 9 deletions(-)

diff --git a/arch/csky/include/asm/io.h b/arch/csky/include/asm/io.h
index a4b9fb616faa..f572605d5ad5 100644
--- a/arch/csky/include/asm/io.h
+++ b/arch/csky/include/asm/io.h
@@ -36,13 +36,11 @@
 /*
  * I/O memory mapping functions.
  */
-extern void __iomem *ioremap_cache(phys_addr_t addr, size_t size);
 extern void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot);
 extern void iounmap(void *addr);
 
 #define ioremap(addr, size)		__ioremap((addr), (size), pgprot_noncached(PAGE_KERNEL))
 #define ioremap_wc(addr, size)		__ioremap((addr), (size), pgprot_writecombine(PAGE_KERNEL))
-#define ioremap_cache			ioremap_cache
 
 #include <asm-generic/io.h>
 
diff --git a/arch/csky/mm/ioremap.c b/arch/csky/mm/ioremap.c
index e13cd3497628..ae78256a56fd 100644
--- a/arch/csky/mm/ioremap.c
+++ b/arch/csky/mm/ioremap.c
@@ -44,13 +44,6 @@ void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot)
 }
 EXPORT_SYMBOL(__ioremap);
 
-void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size)
-{
-	return __ioremap_caller(phys_addr, size, PAGE_KERNEL,
-				__builtin_return_address(0));
-}
-EXPORT_SYMBOL(ioremap_cache);
-
 void iounmap(void __iomem *addr)
 {
 	vunmap((void *)((unsigned long)addr & PAGE_MASK));
-- 
2.20.1


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 21/21] csky: use generic ioremap
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (19 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 20/21] csky: remove ioremap_cache Christoph Hellwig
@ 2019-10-29  6:48 ` Christoph Hellwig
  2019-11-05  1:31 ` generic ioremap (and lots of cleanups) v3 Christoph Hellwig
       [not found] ` <20191107204743.GA22863@lst.de>
  22 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-29  6:48 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

Use the generic ioremap_prot and iounmap helpers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/csky/Kconfig               |  1 +
 arch/csky/include/asm/io.h      |  8 +++---
 arch/csky/include/asm/pgtable.h |  4 +++
 arch/csky/mm/ioremap.c          | 45 ---------------------------------
 4 files changed, 8 insertions(+), 50 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 f572605d5ad5..332f51bc68fb 100644
--- a/arch/csky/include/asm/io.h
+++ b/arch/csky/include/asm/io.h
@@ -36,11 +36,9 @@
 /*
  * I/O memory mapping functions.
  */
-extern void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot);
-extern void iounmap(void *addr);
-
-#define ioremap(addr, size)		__ioremap((addr), (size), pgprot_noncached(PAGE_KERNEL))
-#define ioremap_wc(addr, size)		__ioremap((addr), (size), pgprot_writecombine(PAGE_KERNEL))
+#define ioremap_wc(addr, size) \
+	ioremap_prot((addr), (size), \
+		(_PAGE_IOREMAP & ~_CACHE_MASK) | _CACHE_UNCACHED)
 
 #include <asm-generic/io.h>
 
diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h
index 7c21985c60dc..4b2a41e15f2e 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 ae78256a56fd..70c8268d3b2b 100644
--- a/arch/csky/mm/ioremap.c
+++ b/arch/csky/mm/ioremap.c
@@ -3,53 +3,8 @@
 
 #include <linux/export.h>
 #include <linux/mm.h>
-#include <linux/vmalloc.h>
 #include <linux/io.h>
 
-#include <asm/pgtable.h>
-
-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;
-
-	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_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);
-}
-
-void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot)
-{
-	return __ioremap_caller(phys_addr, size, prot,
-				__builtin_return_address(0));
-}
-EXPORT_SYMBOL(__ioremap);
-
-void iounmap(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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 13/21] m68k: rename __iounmap and mark it static
  2019-10-29  6:48 ` [PATCH 13/21] m68k: rename __iounmap and mark it static Christoph Hellwig
@ 2019-10-30  8:51   ` Geert Uytterhoeven
  0 siblings, 0 replies; 48+ messages in thread
From: Geert Uytterhoeven @ 2019-10-30  8:51 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, Linux-sh list, Linux Kernel Mailing List, Guo Ren,
	sparclinux, linux-riscv, Vincent Chen, Linux-Arch, linux-s390,
	open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, arcml, linux-xtensa, Arnd Bergmann,
	linux-m68k, Openrisc, Greentime Hu, MTD Maling List, Guan Xuetao,
	Linux ARM, Michal Simek, Parisc List, linux-mips, alpha,
	nios2-dev

On Tue, Oct 29, 2019 at 7:56 AM Christoph Hellwig <hch@lst.de> wrote:
> m68k uses __iounmap as the name for an internal helper that is only
> used for some CPU types.  Mark it static, give it a better name
> and move it around a bit to avoid a forward declaration.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Thanks for the update!

Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 08/21] x86: Clean up ioremap()
  2019-10-29  6:48 ` [PATCH 08/21] x86: Clean up ioremap() Christoph Hellwig
@ 2019-10-30 10:39   ` Thomas Gleixner
  0 siblings, 0 replies; 48+ messages in thread
From: Thomas Gleixner @ 2019-10-30 10:39 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, linux-sh, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, linux-arch, linux-s390, linux-hexagon,
	x86, linux-snps-arc, linux-xtensa, Arnd Bergmann, linux-m68k,
	openrisc, Greentime Hu, linux-mtd, Guan Xuetao, linux-arm-kernel,
	Michal Simek, linux-parisc, linux-mips, linux-alpha, nios2-dev

On Tue, 29 Oct 2019, Christoph Hellwig wrote:

> Use ioremap() as the main implemented function, and defines
> ioremap_nocache() as a deprecated alias of ioremap() in
> preparation of removing ioremap_nocache() entirely.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: generic ioremap (and lots of cleanups) v3
  2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
                   ` (20 preceding siblings ...)
  2019-10-29  6:48 ` [PATCH 21/21] csky: use generic ioremap Christoph Hellwig
@ 2019-11-05  1:31 ` Christoph Hellwig
       [not found] ` <20191107204743.GA22863@lst.de>
  22 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-11-05  1:31 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

Hi folks,

can I get a few more reviews?  Especially for the actual generic
ioremap implementation and the asm-generic bits?  I'd love to be able
to queue this up for linux-next some time this week.

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 07/21] parisc: remove __ioremap
  2019-10-29  6:48 ` [PATCH 07/21] parisc: " Christoph Hellwig
@ 2019-11-05 14:29   ` Helge Deller
  0 siblings, 0 replies; 48+ messages in thread
From: Helge Deller @ 2019-11-05 14:29 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, linux-sh, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, linux-arch, linux-s390, linux-hexagon,
	x86, linux-snps-arc, Arnd Bergmann, linux-m68k, openrisc,
	Greentime Hu, nios2-dev, Guan Xuetao, linux-arm-kernel,
	Michal Simek, linux-parisc, linux-mips, linux-alpha, linux-mtd

On 29.10.19 07:48, Christoph Hellwig wrote:
> __ioremap is always called with the _PAGE_NO_CACHE, so fold the whole
> thing and rename it to ioremap.  This also allows to remove the special
> EISA quirk to force _PAGE_NO_CACHE.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Acked-by: Helge Deller <deller@gmx.de>

Helge

> ---
>  arch/parisc/include/asm/io.h | 11 +----------
>  arch/parisc/mm/ioremap.c     | 10 ++++------
>  2 files changed, 5 insertions(+), 16 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 f29f682352f0..6e7c005aa09b 100644
> --- a/arch/parisc/mm/ioremap.c
> +++ b/arch/parisc/mm/ioremap.c
> @@ -25,7 +25,7 @@
>   * 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;
> @@ -36,10 +36,8 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l
>  	unsigned long end = phys_addr + size - 1;
>  	/* Support EISA addresses */
>  	if ((phys_addr >= 0x00080000 && end < 0x000fffff) ||
> -	    (phys_addr >= 0x00500000 && end < 0x03bfffff)) {
> +	    (phys_addr >= 0x00500000 && end < 0x03bfffff))
>  		phys_addr |= F_EXTEND(0xfc000000);
> -		flags |= _PAGE_NO_CACHE;
> -	}
>  #endif
>
>  	/* Don't allow wraparound or zero size */
> @@ -65,7 +63,7 @@ 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 +88,7 @@ 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 *io_addr)
>  {
>


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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 10/21] asm-generic: ioremap_uc should behave the same with and without MMU
  2019-10-29  6:48 ` [PATCH 10/21] asm-generic: ioremap_uc should behave the same with and without MMU Christoph Hellwig
@ 2019-11-06 17:56   ` Palmer Dabbelt
  2019-11-11 10:09   ` Arnd Bergmann
  1 sibling, 0 replies; 48+ messages in thread
From: Palmer Dabbelt @ 2019-11-06 17:56 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, linux-sh, linux-kernel, guoren, sparclinux,
	linux-riscv, deanbo422, linux-arch, linux-s390, linux-hexagon,
	x86, linux-snps-arc, linux-xtensa, Arnd Bergmann, linux-m68k,
	openrisc, green.hu, linux-mtd, gxt, linux-arm-kernel, monstr,
	linux-parisc, linux-mips, linux-alpha, nios2-dev

On Mon, 28 Oct 2019 23:48:23 PDT (-0700), 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 <hch@lst.de>
> ---
>  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

Presumably that's supposed to be "do not want to use"?

> + * 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

With the fix:

Reviewed-by: Palmer Dabbelt <palmer@dabbelt.com>

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 11/21] asm-generic: don't provide ioremap for CONFIG_MMU
  2019-10-29  6:48 ` [PATCH 11/21] asm-generic: don't provide ioremap for CONFIG_MMU Christoph Hellwig
@ 2019-11-06 18:11   ` Palmer Dabbelt
  2019-11-06 18:16     ` Geert Uytterhoeven
  2019-11-11 10:29   ` Arnd Bergmann
  1 sibling, 1 reply; 48+ messages in thread
From: Palmer Dabbelt @ 2019-11-06 18:11 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, linux-sh, linux-kernel, guoren, sparclinux,
	linux-riscv, deanbo422, linux-arch, linux-s390, linux-hexagon,
	x86, linux-snps-arc, linux-xtensa, Arnd Bergmann, linux-m68k,
	openrisc, green.hu, linux-mtd, gxt, linux-arm-kernel, monstr,
	linux-parisc, linux-mips, linux-alpha, nios2-dev

On Mon, 28 Oct 2019 23:48:24 PDT (-0700), 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 <hch@lst.de>
> ---
>  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 <linux/types.h>
>
> +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 <asm-generic/io.h>
> +
>  #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)
>  {

It looks like the difference in prototype between the architectures is between

    void __iomem *ioremap(resource_size_t, size_t)
    void __iomem *ioremap(phys_addr_t, size_t)
    void __iomem *ioremap(phys_addr_t, unsigned long)
    void __iomem *ioremap(unsigned long, unsigned long)

shouldn't they all just be that first one?  In other words, wouldn't it be 
better to always provide the generic ioremap prototype and unify the ports 
instead?

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 11/21] asm-generic: don't provide ioremap for CONFIG_MMU
  2019-11-06 18:11   ` Palmer Dabbelt
@ 2019-11-06 18:16     ` Geert Uytterhoeven
  2019-11-06 18:28       ` Christoph Hellwig
  2019-11-11 10:31       ` Arnd Bergmann
  0 siblings, 2 replies; 48+ messages in thread
From: Geert Uytterhoeven @ 2019-11-06 18:16 UTC (permalink / raw)
  To: Palmer Dabbelt
  Cc: linux-ia64, Linux-sh list, linux-mips, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, Christoph Hellwig, Linux-Arch,
	linux-s390, open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, arcml, linux-xtensa, Arnd Bergmann,
	linux-m68k, Openrisc, Greentime Hu, nios2-dev, Guan Xuetao,
	Linux ARM, Michal Simek, Parisc List, Linux Kernel Mailing List,
	alpha, MTD Maling List

Hi Palmer,

On Wed, Nov 6, 2019 at 7:11 PM Palmer Dabbelt <palmer@dabbelt.com> wrote:
> It looks like the difference in prototype between the architectures is between
>
>     void __iomem *ioremap(resource_size_t, size_t)
>     void __iomem *ioremap(phys_addr_t, size_t)
>     void __iomem *ioremap(phys_addr_t, unsigned long)
>     void __iomem *ioremap(unsigned long, unsigned long)
>
> shouldn't they all just be that first one?  In other words, wouldn't it be
> better to always provide the generic ioremap prototype and unify the ports
> instead?

Agreed. But I'd go for the second one.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 11/21] asm-generic: don't provide ioremap for CONFIG_MMU
  2019-11-06 18:16     ` Geert Uytterhoeven
@ 2019-11-06 18:28       ` Christoph Hellwig
  2019-11-11 10:31       ` Arnd Bergmann
  1 sibling, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-11-06 18:28 UTC (permalink / raw)
  To: Geert Uytterhoeven
  Cc: linux-ia64, Linux-sh list, linux-mips, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, Christoph Hellwig, Linux-Arch,
	linux-s390, open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, arcml, linux-xtensa, Arnd Bergmann,
	linux-m68k, Openrisc, Greentime Hu, nios2-dev, Guan Xuetao,
	Linux ARM, Michal Simek, Parisc List, Linux Kernel Mailing List,
	Palmer Dabbelt, alpha, MTD Maling List

On Wed, Nov 06, 2019 at 07:16:38PM +0100, Geert Uytterhoeven wrote:
> > shouldn't they all just be that first one?  In other words, wouldn't it be
> > better to always provide the generic ioremap prototype and unify the ports
> > instead?
> 
> Agreed. But I'd go for the second one.

Eventually we should unify it and only have a single prototype.
But we have lots of implementations including inline functions, so
this will take a few more steps.

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 12/21] arch: rely on asm-generic/io.h for default ioremap_* definitions
  2019-10-29  6:48 ` [PATCH 12/21] arch: rely on asm-generic/io.h for default ioremap_* definitions Christoph Hellwig
@ 2019-11-07 15:29   ` Palmer Dabbelt
  2019-11-11 10:10   ` Arnd Bergmann
  1 sibling, 0 replies; 48+ messages in thread
From: Palmer Dabbelt @ 2019-11-07 15:29 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, linux-sh, linux-kernel, guoren, sparclinux,
	linux-riscv, deanbo422, linux-arch, linux-s390, linux-hexagon,
	x86, linux-snps-arc, linux-xtensa, Arnd Bergmann, linux-m68k,
	openrisc, green.hu, linux-mtd, gxt, linux-arm-kernel, monstr,
	linux-parisc, linux-mips, linux-alpha, nios2-dev

On Mon, 28 Oct 2019 23:48:25 PDT (-0700), 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 <asm-generic/io.h>.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  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       |  1 -
>  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(+), 51 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 323cb306bd28..4e531f57147d 100644
> --- a/arch/arm64/include/asm/io.h
> +++ b/arch/arm64/include/asm/io.h
> @@ -167,9 +167,7 @@ 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))
>
>  /*
>   * PCI configuration space mapping function.
> diff --git a/arch/csky/include/asm/io.h b/arch/csky/include/asm/io.h
> index 80d071e2567f..a4b9fb616faa 100644
> --- a/arch/csky/include/asm/io.h
> +++ b/arch/csky/include/asm/io.h
> @@ -42,7 +42,6 @@ extern void iounmap(void *addr);
>
>  #define ioremap(addr, size)		__ioremap((addr), (size), pgprot_noncached(PAGE_KERNEL))
>  #define ioremap_wc(addr, size)		__ioremap((addr), (size), pgprot_writecombine(PAGE_KERNEL))
> -#define ioremap_nocache(addr, size)	ioremap((addr), (size))
>  #define ioremap_cache			ioremap_cache
>
>  #include <asm-generic/io.h>
> diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h
> index fec9df9609ed..3d666a11a2de 100644
> --- a/arch/ia64/include/asm/io.h
> +++ b/arch/ia64/include/asm/io.h
> @@ -263,7 +263,6 @@ 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/include/asm/io.h b/arch/openrisc/include/asm/io.h
> index 5b81a96ab85e..e18f038b2a6d 100644
> --- a/arch/openrisc/include/asm/io.h
> +++ b/arch/openrisc/include/asm/io.h
> @@ -25,7 +25,6 @@
>  #define PIO_OFFSET		0
>  #define PIO_MASK		0
>
> -#define ioremap_nocache ioremap
>  #include <asm-generic/io.h>
>  #include <asm/pgtable.h>
>
> diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h
> index fc1189ad3777..c1de6875cc77 100644
> --- a/arch/riscv/include/asm/io.h
> +++ b/arch/riscv/include/asm/io.h
> @@ -15,16 +15,6 @@
>  #include <asm/mmiowb.h>
>
>  extern void __iomem *ioremap(phys_addr_t offset, unsigned long size);
> -
> -/*
> - * The RISC-V ISA doesn't yet specify how to query or modify PMAs, so we can't
> - * change the properties of memory regions.  This should be fixed by the
> - * upcoming platform spec.
> - */
> -#define ioremap_nocache(addr, size) ioremap((addr), (size))
> -#define ioremap_wc(addr, size) ioremap((addr), (size))
> -#define ioremap_wt(addr, size) ioremap((addr), (size))
> -
>  extern void iounmap(volatile void __iomem *addr);
>
>  /* Generic IO read/write.  These perform native-endian accesses. */
> diff --git a/arch/s390/include/asm/io.h b/arch/s390/include/asm/io.h
> index ca421614722f..5a16f500515a 100644
> --- a/arch/s390/include/asm/io.h
> +++ b/arch/s390/include/asm/io.h
> @@ -26,10 +26,6 @@ void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);
>
>  #define IO_SPACE_LIMIT 0
>
> -#define ioremap_nocache(addr, size)	ioremap(addr, size)
> -#define ioremap_wc			ioremap_nocache
> -#define ioremap_wt			ioremap_nocache
> -
>  void __iomem *ioremap(unsigned long offset, unsigned long size);
>  void iounmap(volatile void __iomem *addr);
>
> diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
> index 6b5cc41319a7..9997521fc5cd 100644
> --- a/arch/x86/include/asm/io.h
> +++ b/arch/x86/include/asm/io.h
> @@ -205,7 +205,6 @@ extern void __iomem *ioremap_encrypted(resource_size_t phys_addr, unsigned long
>   */
>  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/xtensa/include/asm/io.h b/arch/xtensa/include/asm/io.h
> index 441fb56926a7..54188e69b988 100644
> --- a/arch/xtensa/include/asm/io.h
> +++ b/arch/xtensa/include/asm/io.h
> @@ -52,10 +52,6 @@ static inline void __iomem *ioremap_cache(unsigned long offset,
>  }
>  #define ioremap_cache ioremap_cache
>
> -#define ioremap_nocache ioremap
> -#define ioremap_wc ioremap
> -#define ioremap_wt ioremap
> -
>  static inline void iounmap(volatile void __iomem *addr)
>  {
>  	unsigned long va = (unsigned long) addr;
> diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> index 6a5edc23afe2..4e45e1cb6560 100644
> --- a/include/asm-generic/io.h
> +++ b/include/asm-generic/io.h
> @@ -949,27 +949,15 @@ static inline void iounmap(void __iomem *addr)
>  #endif /* CONFIG_MMU */
>
>  #ifndef ioremap_nocache
> -#define ioremap_nocache ioremap_nocache
> -static inline void __iomem *ioremap_nocache(phys_addr_t offset, size_t size)
> -{
> -	return ioremap(offset, size);
> -}
> +#define ioremap_nocache ioremap
>  #endif
>
>  #ifndef ioremap_wc
> -#define ioremap_wc ioremap_wc
> -static inline void __iomem *ioremap_wc(phys_addr_t offset, size_t size)
> -{
> -	return ioremap_nocache(offset, size);
> -}
> +#define ioremap_wc ioremap
>  #endif
>
>  #ifndef ioremap_wt
> -#define ioremap_wt ioremap_wt
> -static inline void __iomem *ioremap_wt(phys_addr_t offset, size_t size)
> -{
> -	return ioremap_nocache(offset, size);
> -}
> +#define ioremap_wt ioremap
>  #endif
>
>  /*

Reviewed-by: Palmer Dabbelt <palmer@dabbelt.com>

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 17/21] lib: provide a simple generic ioremap implementation
  2019-10-29  6:48 ` [PATCH 17/21] lib: provide a simple generic ioremap implementation Christoph Hellwig
@ 2019-11-07 15:29   ` Palmer Dabbelt
  2019-11-11 10:10   ` Arnd Bergmann
  1 sibling, 0 replies; 48+ messages in thread
From: Palmer Dabbelt @ 2019-11-07 15:29 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, linux-sh, linux-kernel, guoren, sparclinux,
	linux-riscv, deanbo422, linux-arch, linux-s390, linux-hexagon,
	x86, linux-snps-arc, linux-xtensa, Arnd Bergmann, linux-m68k,
	openrisc, green.hu, linux-mtd, gxt, linux-arm-kernel, monstr,
	linux-parisc, linux-mips, linux-alpha, nios2-dev

On Mon, 28 Oct 2019 23:48:30 PDT (-0700), Christoph Hellwig wrote:
> 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 <hch@lst.de>
> ---
>  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 <asm/pgtable.h>
> +
> +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 183f92a297ca..afc78aaf2b25 100644
> --- a/lib/Kconfig
> +++ b/lib/Kconfig
> @@ -638,6 +638,9 @@ 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 */

Reviewed-by: Palmer Dabbelt <palmer@dabbelt.com>

Thanks!  This should let us get rid of arch/riscv/mm/ioremap.c.

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: generic-iomap tree for linux-next
       [not found] ` <20191107204743.GA22863@lst.de>
@ 2019-11-08  2:20   ` Stephen Rothwell
  2019-11-08  4:52     ` Stephen Rothwell
  0 siblings, 1 reply; 48+ messages in thread
From: Stephen Rothwell @ 2019-11-08  2:20 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, linux-sh, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, linux-arch, linux-s390, linux-hexagon,
	x86, linux-snps-arc, linux-xtensa, Arnd Bergmann, linux-m68k,
	openrisc, Greentime Hu, linux-mtd, Guan Xuetao, linux-arm-kernel,
	Michal Simek, linux-parisc, linux-mips, linux-alpha, nios2-dev

[-- Attachment #1.1: Type: text/plain, Size: 287 bytes --]

Hi Christoph,

On Thu, 7 Nov 2019 21:47:43 +0100 Christoph Hellwig <hch@lst.de> wrote:
>
> can you add the generic-ioremap tree:
> 
>    git://git.infradead.org/users/hch/ioremap.git
> 
> to linux-next? 

I assume you mean the for-next branch?
-- 
Cheers,
Stephen Rothwell

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[-- Attachment #2: Type: text/plain, Size: 170 bytes --]

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: generic-iomap tree for linux-next
  2019-11-08  2:20   ` generic-iomap tree for linux-next Stephen Rothwell
@ 2019-11-08  4:52     ` Stephen Rothwell
  2019-11-08  5:14       ` Christoph Hellwig
  0 siblings, 1 reply; 48+ messages in thread
From: Stephen Rothwell @ 2019-11-08  4:52 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, linux-sh, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, linux-arch, linux-s390, linux-hexagon,
	x86, linux-snps-arc, linux-xtensa, Arnd Bergmann, linux-m68k,
	openrisc, Greentime Hu, linux-mtd, Guan Xuetao, linux-arm-kernel,
	Michal Simek, linux-parisc, linux-mips, linux-alpha, nios2-dev

[-- Attachment #1.1: Type: text/plain, Size: 1268 bytes --]

Hi Christoph,

On Fri, 8 Nov 2019 13:20:00 +1100 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>
> On Thu, 7 Nov 2019 21:47:43 +0100 Christoph Hellwig <hch@lst.de> wrote:
> >
> > can you add the generic-ioremap tree:
> > 
> >    git://git.infradead.org/users/hch/ioremap.git
> > 
> > to linux-next?   
> 
> I assume you mean the for-next branch?

With that assumption, added from today.

Thanks for adding your subsystem tree as a participant of linux-next.  As
you may know, this is not a judgement of your code.  The purpose of
linux-next is for integration testing and to lower the impact of
conflicts between subsystems in the next merge window. 

You will need to ensure that the patches/commits in your tree/series have
been:
     * submitted under GPL v2 (or later) and include the Contributor's
        Signed-off-by,
     * posted to the relevant mailing list,
     * reviewed by you (or another maintainer of your subsystem tree),
     * successfully unit tested, and 
     * destined for the current or next Linux merge window.

Basically, this should be just what you would send to Linus (or ask him
to fetch).  It is allowed to be rebased if you deem it necessary.

-- 
Cheers,
Stephen Rothwell 
sfr@canb.auug.org.au

[-- Attachment #1.2: OpenPGP digital signature --]
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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: generic-iomap tree for linux-next
  2019-11-08  4:52     ` Stephen Rothwell
@ 2019-11-08  5:14       ` Christoph Hellwig
  0 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-11-08  5:14 UTC (permalink / raw)
  To: Stephen Rothwell
  Cc: linux-ia64, linux-sh, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, Christoph Hellwig, linux-arch,
	linux-s390, linux-hexagon, x86, linux-snps-arc, linux-xtensa,
	Arnd Bergmann, linux-m68k, openrisc, Greentime Hu, nios2-dev,
	Guan Xuetao, linux-arm-kernel, Michal Simek, linux-parisc,
	linux-mips, linux-alpha, linux-mtd

On Fri, Nov 08, 2019 at 03:52:48PM +1100, Stephen Rothwell wrote:
> Hi Christoph,
> 
> On Fri, 8 Nov 2019 13:20:00 +1100 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> >
> > On Thu, 7 Nov 2019 21:47:43 +0100 Christoph Hellwig <hch@lst.de> wrote:
> > >
> > > can you add the generic-ioremap tree:
> > > 
> > >    git://git.infradead.org/users/hch/ioremap.git
> > > 
> > > to linux-next?   
> > 
> > I assume you mean the for-next branch?
> 
> With that assumption, added from today.

Yes, and thanks!

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 10/21] asm-generic: ioremap_uc should behave the same with and without MMU
  2019-10-29  6:48 ` [PATCH 10/21] asm-generic: ioremap_uc should behave the same with and without MMU Christoph Hellwig
  2019-11-06 17:56   ` Palmer Dabbelt
@ 2019-11-11 10:09   ` Arnd Bergmann
  2019-11-11 10:15     ` Christoph Hellwig
  1 sibling, 1 reply; 48+ messages in thread
From: Arnd Bergmann @ 2019-11-11 10:09 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, Linux-sh list, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, linux-arch, linux-s390,
	open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, open list:SYNOPSYS ARC ARCHITECTURE,
	linux-xtensa, linux-m68k, openrisc, Greentime Hu,
	moderated list:NIOS2 ARCHITECTURE, Guan Xuetao, Linux ARM,
	Michal Simek, Parisc List, linux-mips, alpha, linux-mtd

On Tue, Oct 29, 2019 at 7:49 AM Christoph Hellwig <hch@lst.de> 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.

Makes sense.

> 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.



> +/*
> + * 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

Maybe we could move the definition into the atyfb driver itself?

As I understand it, the difference between ioremap()/ioremap_nocache()
and ioremap_uc() only exists on pre-PAT x86-32 systems (i.e. 486, P5,
Ppro, PII, K6, VIA C3), while on more modern systems (all non-x86,
PentiumIII, Athlon, VIA C7)  those three are meant to be synonyms
anyway.

      Arnd

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 12/21] arch: rely on asm-generic/io.h for default ioremap_* definitions
  2019-10-29  6:48 ` [PATCH 12/21] arch: rely on asm-generic/io.h for default ioremap_* definitions Christoph Hellwig
  2019-11-07 15:29   ` Palmer Dabbelt
@ 2019-11-11 10:10   ` Arnd Bergmann
  1 sibling, 0 replies; 48+ messages in thread
From: Arnd Bergmann @ 2019-11-11 10:10 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, Linux-sh list, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, linux-arch, linux-s390,
	open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, open list:SYNOPSYS ARC ARCHITECTURE,
	linux-xtensa, linux-m68k, openrisc, Greentime Hu,
	moderated list:NIOS2 ARCHITECTURE, Guan Xuetao, Linux ARM,
	Michal Simek, Parisc List, linux-mips, alpha, linux-mtd

On Tue, Oct 29, 2019 at 7:49 AM Christoph Hellwig <hch@lst.de> 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 <asm-generic/io.h>.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Arnd Bergmann <arnd@arndb.de>

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 17/21] lib: provide a simple generic ioremap implementation
  2019-10-29  6:48 ` [PATCH 17/21] lib: provide a simple generic ioremap implementation Christoph Hellwig
  2019-11-07 15:29   ` Palmer Dabbelt
@ 2019-11-11 10:10   ` Arnd Bergmann
  1 sibling, 0 replies; 48+ messages in thread
From: Arnd Bergmann @ 2019-11-11 10:10 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, Linux-sh list, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, linux-arch, linux-s390,
	open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, open list:SYNOPSYS ARC ARCHITECTURE,
	linux-xtensa, linux-m68k, openrisc, Greentime Hu,
	moderated list:NIOS2 ARCHITECTURE, Guan Xuetao, Linux ARM,
	Michal Simek, Parisc List, linux-mips, alpha, linux-mtd

On Tue, Oct 29, 2019 at 7:49 AM Christoph Hellwig <hch@lst.de> wrote:
>
> 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 <hch@lst.de>

Reviewed-by: Arnd Bergmann <arnd@arndb.de>

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 10/21] asm-generic: ioremap_uc should behave the same with and without MMU
  2019-11-11 10:09   ` Arnd Bergmann
@ 2019-11-11 10:15     ` Christoph Hellwig
  2019-11-11 10:27       ` Arnd Bergmann
  0 siblings, 1 reply; 48+ messages in thread
From: Christoph Hellwig @ 2019-11-11 10:15 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: linux-ia64, Linux-sh list, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, Christoph Hellwig, linux-arch,
	linux-s390, open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, open list:SYNOPSYS ARC ARCHITECTURE,
	linux-xtensa, linux-m68k, openrisc, Greentime Hu, linux-mtd,
	Guan Xuetao, Linux ARM, Michal Simek, Parisc List, linux-mips,
	alpha, moderated list:NIOS2 ARCHITECTURE

On Mon, Nov 11, 2019 at 11:09:05AM +0100, Arnd Bergmann wrote:
> Maybe we could move the definition into the atyfb driver itself?
> 
> As I understand it, the difference between ioremap()/ioremap_nocache()
> and ioremap_uc() only exists on pre-PAT x86-32 systems (i.e. 486, P5,
> Ppro, PII, K6, VIA C3), while on more modern systems (all non-x86,
> PentiumIII, Athlon, VIA C7)  those three are meant to be synonyms
> anyway.

That's not how I understood it.  Based on the code and the UC-
explanation ioremap_uc always overrides the MTRR, which can still
be present on more modern x86 systems.  In fact I remember a patch
floating around very recently adding another ioremap_uc caller in
some Atom platform device driver that works around buggy MTRR
tables.  Also this series actually adds a new override and a few
callers for ia64 platform code, which works very similar to x86
based on the comments in the code.  That being said I'm not sure
the callers in ia64 are really required, but it was the safest thing
to do as part of this cleanup.

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 10/21] asm-generic: ioremap_uc should behave the same with and without MMU
  2019-11-11 10:15     ` Christoph Hellwig
@ 2019-11-11 10:27       ` Arnd Bergmann
  2019-11-11 10:29         ` Christoph Hellwig
  0 siblings, 1 reply; 48+ messages in thread
From: Arnd Bergmann @ 2019-11-11 10:27 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, Linux-sh list, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, linux-arch, linux-s390,
	open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, open list:SYNOPSYS ARC ARCHITECTURE,
	linux-xtensa, linux-m68k, openrisc, Greentime Hu,
	moderated list:NIOS2 ARCHITECTURE, Guan Xuetao, Linux ARM,
	Michal Simek, Parisc List, linux-mips, alpha, linux-mtd

On Mon, Nov 11, 2019 at 11:15 AM Christoph Hellwig <hch@lst.de> wrote:
>
> On Mon, Nov 11, 2019 at 11:09:05AM +0100, Arnd Bergmann wrote:
> > Maybe we could move the definition into the atyfb driver itself?
> >
> > As I understand it, the difference between ioremap()/ioremap_nocache()
> > and ioremap_uc() only exists on pre-PAT x86-32 systems (i.e. 486, P5,
> > Ppro, PII, K6, VIA C3), while on more modern systems (all non-x86,
> > PentiumIII, Athlon, VIA C7)  those three are meant to be synonyms
> > anyway.
>
> That's not how I understood it.  Based on the code and the UC-
> explanation ioremap_uc always overrides the MTRR, which can still
> be present on more modern x86 systems.

As I understand, the point is that on PAT-enabled systems, the
normal ioremap() *also* overrides the MTRR, citing from
Documentation/x86/pat.rst:

  ====  =======  ===  =========================  =====================
  MTRR  Non-PAT  PAT  Linux ioremap value        Effective memory type
  ====  =======  ===  =========================  =====================
        PAT                                        Non-PAT |  PAT
        |PCD                                               |
        ||PWT                                              |
        |||                                                |
  WC    000      WB   _PAGE_CACHE_MODE_WB             WC   |   WC
  WC    001      WC   _PAGE_CACHE_MODE_WC             WC*  |   WC
  WC    010      UC-  _PAGE_CACHE_MODE_UC_MINUS       WC*  |   UC
  WC    011      UC   _PAGE_CACHE_MODE_UC             UC   |   UC
  ====  =======  ===  =========================  =====================

> In fact I remember a patch
> floating around very recently adding another ioremap_uc caller in
> some Atom platform device driver that works around buggy MTRR
> tables.  Also this series actually adds a new override and a few
> callers for ia64 platform code, which works very similar to x86
> based on the comments in the code.  That being said I'm not sure
> the callers in ia64 are really required, but it was the safest thing
> to do as part of this cleanup.

Ok, fair enough. Let's just go with your version for now, if only to not
hold your series up more. I'd still suggest we change atyfb to only
use ioremap_uc() on i386 and maybe ia64. I can send a patch for that.

      Arnd

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 10/21] asm-generic: ioremap_uc should behave the same with and without MMU
  2019-11-11 10:27       ` Arnd Bergmann
@ 2019-11-11 10:29         ` Christoph Hellwig
  2019-11-11 19:33           ` Arnd Bergmann
  0 siblings, 1 reply; 48+ messages in thread
From: Christoph Hellwig @ 2019-11-11 10:29 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: linux-ia64, Linux-sh list, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, Christoph Hellwig, linux-arch,
	linux-s390, open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, open list:SYNOPSYS ARC ARCHITECTURE,
	linux-xtensa, linux-m68k, openrisc, Greentime Hu, linux-mtd,
	Guan Xuetao, Linux ARM, Michal Simek, Parisc List, linux-mips,
	alpha, moderated list:NIOS2 ARCHITECTURE

On Mon, Nov 11, 2019 at 11:27:27AM +0100, Arnd Bergmann wrote:
> Ok, fair enough. Let's just go with your version for now, if only to not
> hold your series up more. I'd still suggest we change atyfb to only
> use ioremap_uc() on i386 and maybe ia64. I can send a patch for that.

I don't think we even need it on ia64.  But lets kick off a dicussion
with the atyfb, x86 and ia64 maintainers after this series is in.
Which was kinda my plan anyway.

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 11/21] asm-generic: don't provide ioremap for CONFIG_MMU
  2019-10-29  6:48 ` [PATCH 11/21] asm-generic: don't provide ioremap for CONFIG_MMU Christoph Hellwig
  2019-11-06 18:11   ` Palmer Dabbelt
@ 2019-11-11 10:29   ` Arnd Bergmann
  1 sibling, 0 replies; 48+ messages in thread
From: Arnd Bergmann @ 2019-11-11 10:29 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, Linux-sh list, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, linux-arch, linux-s390,
	open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, open list:SYNOPSYS ARC ARCHITECTURE,
	linux-xtensa, linux-m68k, openrisc, Greentime Hu,
	moderated list:NIOS2 ARCHITECTURE, Guan Xuetao, Linux ARM,
	Michal Simek, Parisc List, linux-mips, alpha, linux-mtd

On Tue, Oct 29, 2019 at 7:49 AM Christoph Hellwig <hch@lst.de> 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 <hch@lst.de>

Reviewed-by: Arnd Bergmann <arnd@arndb.de>

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 11/21] asm-generic: don't provide ioremap for CONFIG_MMU
  2019-11-06 18:16     ` Geert Uytterhoeven
  2019-11-06 18:28       ` Christoph Hellwig
@ 2019-11-11 10:31       ` Arnd Bergmann
  1 sibling, 0 replies; 48+ messages in thread
From: Arnd Bergmann @ 2019-11-11 10:31 UTC (permalink / raw)
  To: Geert Uytterhoeven
  Cc: linux-ia64, Linux-sh list, linux-mips, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, Christoph Hellwig, Linux-Arch,
	linux-s390, open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, arcml, linux-xtensa, linux-m68k,
	Openrisc, Greentime Hu, moderated list:NIOS2 ARCHITECTURE,
	Guan Xuetao, Linux ARM, Michal Simek, Parisc List,
	Linux Kernel Mailing List, Palmer Dabbelt, alpha,
	MTD Maling List

On Wed, Nov 6, 2019 at 7:16 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> Hi Palmer,
>
> On Wed, Nov 6, 2019 at 7:11 PM Palmer Dabbelt <palmer@dabbelt.com> wrote:
> > It looks like the difference in prototype between the architectures is between
> >
> >     void __iomem *ioremap(resource_size_t, size_t)
> >     void __iomem *ioremap(phys_addr_t, size_t)
> >     void __iomem *ioremap(phys_addr_t, unsigned long)
> >     void __iomem *ioremap(unsigned long, unsigned long)
> >
> > shouldn't they all just be that first one?  In other words, wouldn't it be
> > better to always provide the generic ioremap prototype and unify the ports
> > instead?
>
> Agreed. But I'd go for the second one.

Right, phys_addr_t is the correct type here, resource_size_t is just a generic
type that is at least as long as any resource, and usually the same as
phys_addr_t, which is supposed to be used for physical addresses.

      Arnd

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 01/21] arm: remove ioremap_cached
  2019-10-29  6:48 ` [PATCH 01/21] arm: remove ioremap_cached Christoph Hellwig
@ 2019-11-11 10:33   ` Arnd Bergmann
  0 siblings, 0 replies; 48+ messages in thread
From: Arnd Bergmann @ 2019-11-11 10:33 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, Linux-sh list, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, linux-arch, linux-s390,
	open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, open list:SYNOPSYS ARC ARCHITECTURE,
	linux-xtensa, linux-m68k, openrisc, Greentime Hu,
	moderated list:NIOS2 ARCHITECTURE, Guan Xuetao, Linux ARM,
	Michal Simek, Parisc List, linux-mips, alpha, linux-mtd

On Tue, Oct 29, 2019 at 7:48 AM Christoph Hellwig <hch@lst.de> wrote:
>
> No users of ioremap_cached are left, remove it.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Arnd Bergmann <arnd@arndb.de>

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 03/21] ia64: rename ioremap_nocache to ioremap_uc
  2019-10-29  6:48 ` [PATCH 03/21] ia64: rename ioremap_nocache to ioremap_uc Christoph Hellwig
@ 2019-11-11 10:36   ` Arnd Bergmann
  0 siblings, 0 replies; 48+ messages in thread
From: Arnd Bergmann @ 2019-11-11 10:36 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, Linux-sh list, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, linux-arch, linux-s390,
	open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, open list:SYNOPSYS ARC ARCHITECTURE,
	linux-xtensa, linux-m68k, openrisc, Greentime Hu,
	moderated list:NIOS2 ARCHITECTURE, Guan Xuetao, Linux ARM,
	Michal Simek, Parisc List, linux-mips, alpha, linux-mtd

On Tue, Oct 29, 2019 at 7:48 AM Christoph Hellwig <hch@lst.de> wrote:
>
> On ia64 ioremap_nocache fails if attributes 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 in a similar way as the ia64
> version of ioremap_nocache, in that it ignores the firmware tables.
> Switch ia64 to override ioremap_uc instead.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Good idea,

Reviewed-by: Arnd Bergmann <arnd@arndb.de>

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 10/21] asm-generic: ioremap_uc should behave the same with and without MMU
  2019-11-11 10:29         ` Christoph Hellwig
@ 2019-11-11 19:33           ` Arnd Bergmann
  0 siblings, 0 replies; 48+ messages in thread
From: Arnd Bergmann @ 2019-11-11 19:33 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: linux-ia64, Linux-sh list, linux-kernel, Guo Ren, sparclinux,
	linux-riscv, Vincent Chen, linux-arch, linux-s390,
	open list:QUALCOMM HEXAGON...,
	the arch/x86 maintainers, open list:SYNOPSYS ARC ARCHITECTURE,
	linux-xtensa, linux-m68k, openrisc, Greentime Hu,
	moderated list:NIOS2 ARCHITECTURE, Guan Xuetao, Linux ARM,
	Michal Simek, Parisc List, linux-mips, alpha, linux-mtd

On Mon, Nov 11, 2019 at 11:29 AM Christoph Hellwig <hch@lst.de> wrote:
>
> On Mon, Nov 11, 2019 at 11:27:27AM +0100, Arnd Bergmann wrote:
> > Ok, fair enough. Let's just go with your version for now, if only to not
> > hold your series up more. I'd still suggest we change atyfb to only
> > use ioremap_uc() on i386 and maybe ia64. I can send a patch for that.
>
> I don't think we even need it on ia64.  But lets kick off a dicussion
> with the atyfb, x86 and ia64 maintainers after this series is in.
> Which was kinda my plan anyway.

I missed your reply and already sent my patch now. I guess it doesn't
hurt to discuss that in parallel. Anyway I think that this patch is the
last one you want an Ack from me for (let me know if I missed one), so

Reviewed-by: Arnd Bergmann <arnd@arndb.de>

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* Re: [PATCH 19/21] nds32: use generic ioremap
  2019-10-29  6:48 ` [PATCH 19/21] nds32: use generic ioremap Christoph Hellwig
@ 2019-11-12  8:51   ` Greentime Hu
  0 siblings, 0 replies; 48+ messages in thread
From: Greentime Hu @ 2019-11-12  8:51 UTC (permalink / raw)
  To: Christoph Hellwig, Nickhu, alankao
  Cc: linux-ia64, linux-sh, Linux Kernel Mailing List, Guo Ren,
	sparclinux, linux-riscv, Vincent Chen, linux-arch, linux-s390,
	linux-hexagon, x86, linux-snps-arc, linux-xtensa, Arnd Bergmann,
	linux-m68k, openrisc, nios2-dev, Guan Xuetao, linux-arm-kernel,
	Michal Simek, linux-parisc, linux-mips, linux-alpha, linux-mtd

Hi,

Christoph Hellwig <hch@lst.de> 於 2019年10月29日 週二 下午2:49寫道:
>
> 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 <hch@lst.de>
> ---
>  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 <linux/types.h>
>
> -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 <asm-generic/io.h>
>
>  #endif /* __ASM_NDS32_IO_H */
> diff --git a/arch/nds32/include/asm/pgtable.h b/arch/nds32/include/asm/pgtable.h
> index 0588ec99725c..6fbf251cfc26 100644
> --- a/arch/nds32/include/asm/pgtable.h
> +++ b/arch/nds32/include/asm/pgtable.h
> @@ -12,7 +12,6 @@
>  #include <asm/nds32.h>
>  #ifndef __ASSEMBLY__
>  #include <asm/fixmap.h>
> -#include <asm/io.h>
>  #include <nds32_intrinsic.h>
>  #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..000000000000
> --- 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 <linux/vmalloc.h>
> -#include <linux/io.h>
> -#include <linux/mm.h>
> -#include <asm/pgtable.h>
> -
> -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);

Acked-by: Greentime Hu <green.hu@gmail.com>
Looks good to me.

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^ permalink raw reply	[flat|nested] 48+ messages in thread

* [PATCH 05/21] alpha: remove the unused __ioremap wrapper
  2019-10-17 17:45 generic ioremap (and lots of cleanups) v2 Christoph Hellwig
@ 2019-10-17 17:45 ` Christoph Hellwig
  0 siblings, 0 replies; 48+ messages in thread
From: Christoph Hellwig @ 2019-10-17 17:45 UTC (permalink / raw)
  To: Arnd Bergmann, Guo Ren, Michal Simek, Greentime Hu, Vincent Chen,
	Guan Xuetao, x86
  Cc: linux-arch, linux-s390, linux-ia64, linux-parisc, linux-sh,
	linux-hexagon, linux-xtensa, linux-mips, linux-kernel,
	linux-m68k, openrisc, linux-mtd, linux-alpha, sparclinux,
	nios2-dev, linux-riscv, linux-snps-arc, linux-arm-kernel

No need for the additional namespace pollution.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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


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^ permalink raw reply	[flat|nested] 48+ messages in thread

end of thread, back to index

Thread overview: 48+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
2019-10-29  6:48 ` [PATCH 01/21] arm: remove ioremap_cached Christoph Hellwig
2019-11-11 10:33   ` Arnd Bergmann
2019-10-29  6:48 ` [PATCH 02/21] unicore32: " Christoph Hellwig
2019-10-29  6:48 ` [PATCH 03/21] ia64: rename ioremap_nocache to ioremap_uc Christoph Hellwig
2019-11-11 10:36   ` Arnd Bergmann
2019-10-29  6:48 ` [PATCH 04/21] hexagon: clean up ioremap Christoph Hellwig
2019-10-29  6:48 ` [PATCH 05/21] alpha: remove the unused __ioremap wrapper Christoph Hellwig
2019-10-29  6:48 ` [PATCH 06/21] nios2: remove __ioremap Christoph Hellwig
2019-10-29  6:48 ` [PATCH 07/21] parisc: " Christoph Hellwig
2019-11-05 14:29   ` Helge Deller
2019-10-29  6:48 ` [PATCH 08/21] x86: Clean up ioremap() Christoph Hellwig
2019-10-30 10:39   ` Thomas Gleixner
2019-10-29  6:48 ` [PATCH 09/21] xtensa: clean up ioremap Christoph Hellwig
2019-10-29  6:48 ` [PATCH 10/21] asm-generic: ioremap_uc should behave the same with and without MMU Christoph Hellwig
2019-11-06 17:56   ` Palmer Dabbelt
2019-11-11 10:09   ` Arnd Bergmann
2019-11-11 10:15     ` Christoph Hellwig
2019-11-11 10:27       ` Arnd Bergmann
2019-11-11 10:29         ` Christoph Hellwig
2019-11-11 19:33           ` Arnd Bergmann
2019-10-29  6:48 ` [PATCH 11/21] asm-generic: don't provide ioremap for CONFIG_MMU Christoph Hellwig
2019-11-06 18:11   ` Palmer Dabbelt
2019-11-06 18:16     ` Geert Uytterhoeven
2019-11-06 18:28       ` Christoph Hellwig
2019-11-11 10:31       ` Arnd Bergmann
2019-11-11 10:29   ` Arnd Bergmann
2019-10-29  6:48 ` [PATCH 12/21] arch: rely on asm-generic/io.h for default ioremap_* definitions Christoph Hellwig
2019-11-07 15:29   ` Palmer Dabbelt
2019-11-11 10:10   ` Arnd Bergmann
2019-10-29  6:48 ` [PATCH 13/21] m68k: rename __iounmap and mark it static Christoph Hellwig
2019-10-30  8:51   ` Geert Uytterhoeven
2019-10-29  6:48 ` [PATCH 14/21] hexagon: remove __iounmap Christoph Hellwig
2019-10-29  6:48 ` [PATCH 15/21] nios2: " Christoph Hellwig
2019-10-29  6:48 ` [PATCH 16/21] sh: " Christoph Hellwig
2019-10-29  6:48 ` [PATCH 17/21] lib: provide a simple generic ioremap implementation Christoph Hellwig
2019-11-07 15:29   ` Palmer Dabbelt
2019-11-11 10:10   ` Arnd Bergmann
2019-10-29  6:48 ` [PATCH 18/21] riscv: use the generic ioremap code Christoph Hellwig
2019-10-29  6:48 ` [PATCH 19/21] nds32: use generic ioremap Christoph Hellwig
2019-11-12  8:51   ` Greentime Hu
2019-10-29  6:48 ` [PATCH 20/21] csky: remove ioremap_cache Christoph Hellwig
2019-10-29  6:48 ` [PATCH 21/21] csky: use generic ioremap Christoph Hellwig
2019-11-05  1:31 ` generic ioremap (and lots of cleanups) v3 Christoph Hellwig
     [not found] ` <20191107204743.GA22863@lst.de>
2019-11-08  2:20   ` generic-iomap tree for linux-next Stephen Rothwell
2019-11-08  4:52     ` Stephen Rothwell
2019-11-08  5:14       ` Christoph Hellwig
  -- strict thread matches above, loose matches on Subject: below --
2019-10-17 17:45 generic ioremap (and lots of cleanups) v2 Christoph Hellwig
2019-10-17 17:45 ` [PATCH 05/21] alpha: remove the unused __ioremap wrapper Christoph Hellwig

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