linux-kernel - Re: [PATCH v2 05/11] hexagon: mm: Convert to GENERIC

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Message-ID: <YwuFx8S13bkfpqao@MiWiFi-R3L-srv>
Date:   Sun, 28 Aug 2022 23:12:07 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "hch@...radead.org" <hch@...radead.org>,
        "agordeev@...ux.ibm.com" <agordeev@...ux.ibm.com>,
        "wangkefeng.wang@...wei.com" <wangkefeng.wang@...wei.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Brian Cain <bcain@...cinc.com>,
        "linux-hexagon@...r.kernel.org" <linux-hexagon@...r.kernel.org>
Subject: Re: [PATCH v2 05/11] hexagon: mm: Convert to GENERIC_IOREMAP

On 08/22/22 at 06:38am, Christophe Leroy wrote:
> 
> 
> Le 20/08/2022 à 02:31, Baoquan He a écrit :
> > With it, the old ioremap() and iounmap() can be perfectly removed
> > since they are duplicated with the standard functions.
> 
> I see nothing related to the preparation patches. Could this have been 
> converted without all previous patches ? In that case I think this one 
> should go in the begining of the series, it would help see which 
> architectecture really needs the changes to the generic parts.

You are right. Hexagon basically has the same implementation as standard
ioremap and iounmap code. I will move this at the beginning of patch
series in next round of post. Thanks for point this out.

> 
> > 
> > Signed-off-by: Baoquan He <bhe@...hat.com>
> > Cc: Brian Cain <bcain@...cinc.com>
> > Cc: linux-hexagon@...r.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 c33241425a5c..e2d3091ec9d6 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));
> > -}