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From: Clemens Ladisch <clemens@ladisch.de>
To: Abhilash Kesavan <kesavan.abhilash@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>
Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
	Lars-Peter Clausen <lars@metafoo.de>,
	"padma.v@samsung.com" <padma.v@samsung.com>,
	Takashi Iwai <tiwai@suse.de>, Will Deacon <Will.Deacon@arm.com>,
	"lgirdwood@gmail.com" <lgirdwood@gmail.com>,
	"broonie@kernel.org" <broonie@kernel.org>,
	"p.zabel@pengutronix.de" <p.zabel@pengutronix.de>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: Question on arm64 unaligned faults during playback
Date: Tue, 09 Dec 2014 09:19:55 +0100	[thread overview]
Message-ID: <5486B0AB.7000109@ladisch.de> (raw)
In-Reply-To: <CAM4voam0h4e1Z8q3eqNpgMhhfw-zJpfh7fi4iznX_Y0bj98nKA@mail.gmail.com>

Abhilash Kesavan wrote:
> Currently, if I continue to use the SRAM allocation driver, two
> options are working:
> 1) ioremap to ioremap_wc in drivers/misc/sram.c.
> 2) copy_from_user to copy_from_user_toio in sound/core/pcm_lib.c
>
> Which would be the preferred option ?

I don't know how to tell the SRAM allocator to hand out WC memory, but
copy_from_user_toio() is what you would put into your .copy callback.


Regards,
Clemens

WARNING: multiple messages have this Message-ID (diff)
From: clemens@ladisch.de (Clemens Ladisch)
To: linux-arm-kernel@lists.infradead.org
Subject: [alsa-devel] Question on arm64 unaligned faults during playback
Date: Tue, 09 Dec 2014 09:19:55 +0100	[thread overview]
Message-ID: <5486B0AB.7000109@ladisch.de> (raw)
In-Reply-To: <CAM4voam0h4e1Z8q3eqNpgMhhfw-zJpfh7fi4iznX_Y0bj98nKA@mail.gmail.com>

Abhilash Kesavan wrote:
> Currently, if I continue to use the SRAM allocation driver, two
> options are working:
> 1) ioremap to ioremap_wc in drivers/misc/sram.c.
> 2) copy_from_user to copy_from_user_toio in sound/core/pcm_lib.c
>
> Which would be the preferred option ?

I don't know how to tell the SRAM allocator to hand out WC memory, but
copy_from_user_toio() is what you would put into your .copy callback.


Regards,
Clemens

  reply	other threads:[~2014-12-09  8:19 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-08  5:40 Question on arm64 unaligned faults during playback Abhilash Kesavan
2014-12-08  8:49 ` Clemens Ladisch
2014-12-08 10:41   ` Takashi Iwai
2014-12-08 11:15     ` Lars-Peter Clausen
2014-12-08 11:15       ` [alsa-devel] " Lars-Peter Clausen
2014-12-08 11:31       ` Will Deacon
2014-12-08 11:31         ` Will Deacon
2014-12-09  2:56         ` Abhilash Kesavan
2014-12-09  2:56           ` [alsa-devel] " Abhilash Kesavan
2014-12-08 12:04       ` Takashi Iwai
2014-12-08 12:04         ` [alsa-devel] " Takashi Iwai
2014-12-08 12:25       ` Catalin Marinas
2014-12-08 12:25         ` Catalin Marinas
2014-12-09  2:56         ` Abhilash Kesavan
2014-12-09  2:56           ` Abhilash Kesavan
2014-12-09  8:19           ` Clemens Ladisch [this message]
2014-12-09  8:19             ` Clemens Ladisch
2014-12-09 11:43           ` Catalin Marinas
2014-12-09 11:43             ` [alsa-devel] " Catalin Marinas
2014-12-10  4:10             ` Abhilash Kesavan
2014-12-10  4:10               ` [alsa-devel] " Abhilash Kesavan
2014-12-09  2:56   ` Abhilash Kesavan

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