linux-kernel - Re: [PATCH v1 03/47] devres: add devm_ioremap

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Date:	Fri, 20 Mar 2015 16:49:51 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Juergen Gross <jgross@...e.com>,
	Jan Beulich <JBeulich@...e.com>, Borislav Petkov <bp@...e.de>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	venkatesh.pallipadi@...el.com, Dave Airlie <airlied@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
	X86 ML <x86@...nel.org>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	"Luis R. Rodriguez" <mcgrof@...e.com>, Ingo Molnar <mingo@...e.hu>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Antonino Daplas <adaplas@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>
Subject: Re: [PATCH v1 03/47] devres: add devm_ioremap_wc()

On Fri, Mar 20, 2015 at 4:17 PM, Luis R. Rodriguez
<mcgrof@...not-panic.com> wrote:
> From: "Luis R. Rodriguez" <mcgrof@...e.com>
>
> We have devm_ioremap_nocache() but no devm_ioremap_wc()
> so add that. This will be used later.
>
> Cc: Suresh Siddha <suresh.b.siddha@...el.com>
> Cc: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Juergen Gross <jgross@...e.com>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: Andy Lutomirski <luto@...capital.net>
> Cc: Dave Airlie <airlied@...hat.com>
> Cc: Antonino Daplas <adaplas@...il.com>
> Cc: Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
> Cc: Tomi Valkeinen <tomi.valkeinen@...com>
> Cc: linux-fbdev@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>

Looks good to me.

> ---
>  Documentation/driver-model/devres.txt |  1 +
>  include/linux/io.h                    |  2 ++
>  lib/devres.c                          | 29 +++++++++++++++++++++++++++++
>  3 files changed, 32 insertions(+)
>
> diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
> index e1e2bbd..831a536 100644
> --- a/Documentation/driver-model/devres.txt
> +++ b/Documentation/driver-model/devres.txt
> @@ -276,6 +276,7 @@ IOMAP
>    devm_ioport_unmap()
>    devm_ioremap()
>    devm_ioremap_nocache()
> +  devm_ioremap_wc()
>    devm_ioremap_resource() : checks resource, requests memory region, ioremaps
>    devm_iounmap()
>    pcim_iomap()
> diff --git a/include/linux/io.h b/include/linux/io.h
> index 4cc299c..91101a1 100644
> --- a/include/linux/io.h
> +++ b/include/linux/io.h
> @@ -72,6 +72,8 @@ void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
>                            resource_size_t size);
>  void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
>                                    resource_size_t size);
> +void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
> +                             resource_size_t size);
>  void devm_iounmap(struct device *dev, void __iomem *addr);
>  int check_signature(const volatile void __iomem *io_addr,
>                         const unsigned char *signature, int length);
> diff --git a/lib/devres.c b/lib/devres.c
> index 0f1dd2e..2eb2bfe 100644
> --- a/lib/devres.c
> +++ b/lib/devres.c
> @@ -72,6 +72,35 @@ void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
>  EXPORT_SYMBOL(devm_ioremap_nocache);
>
>  /**
> + * devm_ioremap_wc - Managed ioremap_wc()
> + * @dev: Generic device to remap IO address for
> + * @offset: BUS offset to map
> + * @size: Size of map
> + *
> + * Managed ioremap_wc().  Map is automatically unmapped on driver
> + * detach.
> + */
> +void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
> +                             resource_size_t size)
> +{
> +       void __iomem **ptr, *addr;
> +
> +       ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
> +       if (!ptr)
> +               return NULL;
> +
> +       addr = ioremap_wc(offset, size);
> +       if (addr) {
> +               *ptr = addr;
> +               devres_add(dev, ptr);
> +       } else
> +               devres_free(ptr);
> +
> +       return addr;
> +}
> +EXPORT_SYMBOL_GPL(devm_ioremap_wc);
> +
> +/**
>   * devm_iounmap - Managed iounmap()
>   * @dev: Generic device to unmap for
>   * @addr: Address to unmap
> --
> 2.3.2.209.gd67f9d5.dirty
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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