diff mbox series

[v5,RESEND,02/17] hexagon: mm: Convert to GENERIC_IOREMAP

Message ID 20230515090848.833045-3-bhe@redhat.com
State New
Headers
Series mm: ioremap: Convert architectures to take GENERIC_IOREMAP way |

Commit Message

Baoquan He May 15, 2023, 9:08 a.m. UTC 
  By taking GENERIC_IOREMAP method, the generic ioremap_prot() and
iounmap() are visible and available to arch. This change will
simplify implementation by removing duplicated codes with generic
ioremap_prot() and iounmap(), and has the equivalent functioality.

For hexagon, the current ioremap() and iounmap() are the same as
generic version. After taking GENERIC_IOREMAP way, the old ioremap()
and iounmap() can be completely removed.

Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Brian Cain <bcain@quicinc.com>
Cc: linux-hexagon@vger.kernel.org
---
 arch/hexagon/Kconfig          |  1 +
 arch/hexagon/include/asm/io.h |  9 +++++--
 arch/hexagon/mm/ioremap.c     | 44 -----------------------------------
 3 files changed, 8 insertions(+), 46 deletions(-)
 delete mode 100644 arch/hexagon/mm/ioremap.c

Comments

Mike Rapoport May 16, 2023, 6:17 a.m. UTC | #1 
On Mon, May 15, 2023 at 05:08:33PM +0800, Baoquan He wrote:
> By taking GENERIC_IOREMAP method, the generic ioremap_prot() and
> iounmap() are visible and available to arch. This change will
> simplify implementation by removing duplicated codes with generic
> ioremap_prot() and iounmap(), and has the equivalent functioality.
> 
> For hexagon, the current ioremap() and iounmap() are the same as
> generic version. After taking GENERIC_IOREMAP way, the old ioremap()
> and iounmap() can be completely removed.
> 
> Signed-off-by: Baoquan He <bhe@redhat.com>
> Cc: Brian Cain <bcain@quicinc.com>
> Cc: linux-hexagon@vger.kernel.org

Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>

> ---
>  arch/hexagon/Kconfig          |  1 +
>  arch/hexagon/include/asm/io.h |  9 +++++--
>  arch/hexagon/mm/ioremap.c     | 44 -----------------------------------
>  3 files changed, 8 insertions(+), 46 deletions(-)
>  delete mode 100644 arch/hexagon/mm/ioremap.c
> 
> diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
> index 54eadf265178..17afffde1a7f 100644
> --- a/arch/hexagon/Kconfig
> +++ b/arch/hexagon/Kconfig
> @@ -25,6 +25,7 @@ config HEXAGON
>  	select NEED_SG_DMA_LENGTH
>  	select NO_IOPORT_MAP
>  	select GENERIC_IOMAP
> +	select GENERIC_IOREMAP
>  	select GENERIC_SMP_IDLE_THREAD
>  	select STACKTRACE_SUPPORT
>  	select GENERIC_CLOCKEVENTS_BROADCAST
> diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h
> index 46a099de85b7..dcd9cbbf5934 100644
> --- a/arch/hexagon/include/asm/io.h
> +++ b/arch/hexagon/include/asm/io.h
> @@ -170,8 +170,13 @@ static inline void writel(u32 data, volatile void __iomem *addr)
>  #define writew_relaxed __raw_writew
>  #define writel_relaxed __raw_writel
>  
> -void __iomem *ioremap(unsigned long phys_addr, unsigned long size);
> -#define ioremap_uc(X, Y) ioremap((X), (Y))
> +/*
> + * I/O memory mapping functions.
> + */
> +#define _PAGE_IOREMAP (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
> +		       (__HEXAGON_C_DEV << 6))
> +
> +#define ioremap_uc(addr, size) ioremap((addr), (size))
>  
>  
>  #define __raw_writel writel
> diff --git a/arch/hexagon/mm/ioremap.c b/arch/hexagon/mm/ioremap.c
> deleted file mode 100644
> index 255c5b1ee1a7..000000000000
> --- a/arch/hexagon/mm/ioremap.c
> +++ /dev/null
> @@ -1,44 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0-only
> -/*
> - * I/O remap functions for Hexagon
> - *
> - * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
> - */
> -
> -#include <linux/io.h>
> -#include <linux/vmalloc.h>
> -#include <linux/mm.h>
> -
> -void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
> -{
> -	unsigned long last_addr, addr;
> -	unsigned long offset = phys_addr & ~PAGE_MASK;
> -	struct vm_struct *area;
> -
> -	pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
> -					|(__HEXAGON_C_DEV << 6));
> -
> -	last_addr = phys_addr + size - 1;
> -
> -	/*  Wrapping not allowed  */
> -	if (!size || (last_addr < phys_addr))
> -		return NULL;
> -
> -	/*  Rounds up to next page size, including whole-page offset */
> -	size = PAGE_ALIGN(offset + size);
> -
> -	area = get_vm_area(size, VM_IOREMAP);
> -	addr = (unsigned long)area->addr;
> -
> -	if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
> -		vunmap((void *)addr);
> -		return NULL;
> -	}
> -
> -	return (void __iomem *) (offset + addr);
> -}
> -
> -void iounmap(const volatile void __iomem *addr)
> -{
> -	vunmap((void *) ((unsigned long) addr & PAGE_MASK));
> -}
> -- 
> 2.34.1
> 
>
Christoph Hellwig May 17, 2023, 6:27 a.m. UTC | #2 
Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>
diff mbox series

Patch

diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index 54eadf265178..17afffde1a7f 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -25,6 +25,7 @@  config HEXAGON
 	select NEED_SG_DMA_LENGTH
 	select NO_IOPORT_MAP
 	select GENERIC_IOMAP
+	select GENERIC_IOREMAP
 	select GENERIC_SMP_IDLE_THREAD
 	select STACKTRACE_SUPPORT
 	select GENERIC_CLOCKEVENTS_BROADCAST
diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h
index 46a099de85b7..dcd9cbbf5934 100644
--- a/arch/hexagon/include/asm/io.h
+++ b/arch/hexagon/include/asm/io.h
@@ -170,8 +170,13 @@  static inline void writel(u32 data, volatile void __iomem *addr)
 #define writew_relaxed __raw_writew
 #define writel_relaxed __raw_writel
 
-void __iomem *ioremap(unsigned long phys_addr, unsigned long size);
-#define ioremap_uc(X, Y) ioremap((X), (Y))
+/*
+ * I/O memory mapping functions.
+ */
+#define _PAGE_IOREMAP (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
+		       (__HEXAGON_C_DEV << 6))
+
+#define ioremap_uc(addr, size) ioremap((addr), (size))
 
 
 #define __raw_writel writel
diff --git a/arch/hexagon/mm/ioremap.c b/arch/hexagon/mm/ioremap.c
deleted file mode 100644
index 255c5b1ee1a7..000000000000
--- a/arch/hexagon/mm/ioremap.c
+++ /dev/null
@@ -1,44 +0,0 @@ 
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * I/O remap functions for Hexagon
- *
- * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
- */
-
-#include <linux/io.h>
-#include <linux/vmalloc.h>
-#include <linux/mm.h>
-
-void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
-{
-	unsigned long last_addr, addr;
-	unsigned long offset = phys_addr & ~PAGE_MASK;
-	struct vm_struct *area;
-
-	pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
-					|(__HEXAGON_C_DEV << 6));
-
-	last_addr = phys_addr + size - 1;
-
-	/*  Wrapping not allowed  */
-	if (!size || (last_addr < phys_addr))
-		return NULL;
-
-	/*  Rounds up to next page size, including whole-page offset */
-	size = PAGE_ALIGN(offset + size);
-
-	area = get_vm_area(size, VM_IOREMAP);
-	addr = (unsigned long)area->addr;
-
-	if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
-		vunmap((void *)addr);
-		return NULL;
-	}
-
-	return (void __iomem *) (offset + addr);
-}
-
-void iounmap(const volatile void __iomem *addr)
-{
-	vunmap((void *) ((unsigned long) addr & PAGE_MASK));
-}