From: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
To: James Hogan <james.hogan@imgtec.com>
Cc: <linux-mips@linux-mips.org>, <nbd@openwrt.org>, <yanh@lemote.com>,
<linux-kernel@vger.kernel.org>, <ralf@linux-mips.org>,
<alex.smith@imgtec.com>, <taohl@lemote.com>, <chenhc@lemote.com>,
<blogic@openwrt.org>
Subject: Re: [PATCH] MIPS: DMA: fix coherent alloc in non-coherent systems
Date: Thu, 30 Oct 2014 11:38:13 -0700 [thread overview]
Message-ID: <54528595.8070009@imgtec.com> (raw)
In-Reply-To: <54520DE4.9090008@imgtec.com>
On 10/30/2014 03:07 AM, James Hogan wrote:
> Hi Leonid,
>
> On 30/10/14 01:48, Leonid Yegoshin wrote:
>> A default dma_alloc_coherent() fails to alloc a coherent memory on non-coherent
>> systems in case of device->coherent_dma_mask covering the whole memory space.
>>
>> In case of non-coherent systems the coherent memory on MIPS is restricted by
>> size of un-cachable segment and should be located in ZONE_DMA.
> Has this pretty much always been broken?
>
>
Yes, but it can be seen on MIPS32 EVA-based CPUs.
WARNING: multiple messages have this Message-ID (diff)
From: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
To: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org, nbd@openwrt.org, yanh@lemote.com,
linux-kernel@vger.kernel.org, ralf@linux-mips.org,
alex.smith@imgtec.com, taohl@lemote.com, chenhc@lemote.com,
blogic@openwrt.org
Subject: Re: [PATCH] MIPS: DMA: fix coherent alloc in non-coherent systems
Date: Thu, 30 Oct 2014 11:38:13 -0700 [thread overview]
Message-ID: <54528595.8070009@imgtec.com> (raw)
Message-ID: <20141030183813.X77_uFtzmxdjXPHblAnJEE2ZIndmKoJk7M6xjVu2IR0@z> (raw)
In-Reply-To: <54520DE4.9090008@imgtec.com>
On 10/30/2014 03:07 AM, James Hogan wrote:
> Hi Leonid,
>
> On 30/10/14 01:48, Leonid Yegoshin wrote:
>> A default dma_alloc_coherent() fails to alloc a coherent memory on non-coherent
>> systems in case of device->coherent_dma_mask covering the whole memory space.
>>
>> In case of non-coherent systems the coherent memory on MIPS is restricted by
>> size of un-cachable segment and should be located in ZONE_DMA.
> Has this pretty much always been broken?
>
>
Yes, but it can be seen on MIPS32 EVA-based CPUs.
next prev parent reply other threads:[~2014-10-30 18:38 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-30 1:48 [PATCH] MIPS: DMA: fix coherent alloc in non-coherent systems Leonid Yegoshin
2014-10-30 1:48 ` Leonid Yegoshin
2014-10-30 9:48 ` Markos Chandras
2014-10-30 9:48 ` Markos Chandras
2014-10-30 9:51 ` James Hogan
2014-10-30 9:51 ` James Hogan
2014-10-30 9:54 ` Markos Chandras
2014-10-30 9:54 ` Markos Chandras
2014-10-30 10:07 ` James Hogan
2014-10-30 10:07 ` James Hogan
2014-10-30 18:38 ` Leonid Yegoshin [this message]
2014-10-30 18:38 ` Leonid Yegoshin
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