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From: Andrew Morton <akpm@linux-foundation.org>
To: Toshi Kani <toshi.kani@hp.com>
Cc: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com,
	arnd@arndb.de, linux-mm@kvack.org, x86@kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 3/7] mm: Change ioremap to set up huge I/O mappings
Date: Mon, 26 Jan 2015 15:58:11 -0800	[thread overview]
Message-ID: <20150126155811.0ade183f5f3f89277d11fde6@linux-foundation.org> (raw)
In-Reply-To: <1422314009-31667-4-git-send-email-toshi.kani@hp.com>

On Mon, 26 Jan 2015 16:13:25 -0700 Toshi Kani <toshi.kani@hp.com> wrote:

> Change ioremap_pud_range() and ioremap_pmd_range() to set up
> huge I/O mappings when their capability is enabled and their
> conditions are met in a given request -- both virtual & physical
> addresses are aligned and its range fufills the mapping size.
> 
> These changes are only enabled when both CONFIG_HUGE_IOMAP
> and CONFIG_HAVE_ARCH_HUGE_VMAP are defined.
> 
> --- a/lib/ioremap.c
> +++ b/lib/ioremap.c
> @@ -81,6 +81,14 @@ static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr,
>  		return -ENOMEM;
>  	do {
>  		next = pmd_addr_end(addr, end);
> +
> +		if (ioremap_pmd_enabled() &&
> +		    ((next - addr) == PMD_SIZE) &&
> +		    !((phys_addr + addr) & (PMD_SIZE-1))) {

IS_ALIGNED might be a little neater here.

> +			pmd_set_huge(pmd, phys_addr + addr, prot);
> +			continue;
> +		}
> +
>  		if (ioremap_pte_range(pmd, addr, next, phys_addr + addr, prot))
>  			return -ENOMEM;
>  	} while (pmd++, addr = next, addr != end);
> @@ -99,6 +107,14 @@ static inline int ioremap_pud_range(pgd_t *pgd, unsigned long addr,
>  		return -ENOMEM;
>  	do {
>  		next = pud_addr_end(addr, end);
> +
> +		if (ioremap_pud_enabled() &&
> +		    ((next - addr) == PUD_SIZE) &&
> +		    !((phys_addr + addr) & (PUD_SIZE-1))) {

And here.

> +			pud_set_huge(pud, phys_addr + addr, prot);
> +			continue;
> +		}
> +
>  		if (ioremap_pmd_range(pud, addr, next, phys_addr + addr, prot))
>  			return -ENOMEM;
>  	} while (pud++, addr = next, addr != end);

  reply	other threads:[~2015-01-26 23:58 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-26 23:13 [RFC PATCH 0/7] Kernel huge I/O mapping support Toshi Kani
2015-01-26 23:13 ` [RFC PATCH 1/7] mm: Change __get_vm_area_node() to use fls_long() Toshi Kani
2015-01-26 23:13 ` [RFC PATCH 2/7] lib: Add huge I/O map capability interfaces Toshi Kani
2015-01-26 23:54   ` Andrew Morton
2015-01-27  1:01     ` Toshi Kani
2015-01-27 21:37       ` Andrew Morton
2015-01-27 22:01         ` Toshi Kani
2015-02-05 20:56       ` Toshi Kani
2015-01-26 23:13 ` [RFC PATCH 3/7] mm: Change ioremap to set up huge I/O mappings Toshi Kani
2015-01-26 23:58   ` Andrew Morton [this message]
2015-01-27  0:01     ` Toshi Kani
2015-01-26 23:13 ` [RFC PATCH 4/7] mm: Change vunmap to tear down huge KVA mappings Toshi Kani
2015-01-26 23:13 ` [RFC PATCH 5/7] x86, mm: Support huge KVA mappings on x86 Toshi Kani
2015-01-26 23:13 ` [RFC PATCH 6/7] x86, mm: Support huge I/O " Toshi Kani
2015-01-26 23:13 ` [RFC PATCH 7/7] mm: Add config HUGE_IOMAP to enable huge I/O mappings Toshi Kani

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