From: Kumar Gala <galak@kernel.crashing.org>
To: "Li Yang-r58472" <LeoLi@freescale.com>
Cc: "Tabi Timur-B04825" <timur@freescale.com>,
<netdev@vger.kernel.org>, <linuxppc-dev@ozlabs.org>
Subject: Re: [PATCH 1/4] ucc_geth: Change private immrbar_virt_to_phys to generic iopa
Date: Thu, 8 Feb 2007 01:16:19 -0600 [thread overview]
Message-ID: <6C343491-B877-4D7D-A46D-B078862160F6@kernel.crashing.org> (raw)
In-Reply-To: <989B956029373F45A0B8AF02970818900D440B@zch01exm26.fsl.freescale.net>
On Feb 8, 2007, at 1:06 AM, Li Yang-r58472 wrote:
>>> MURAM is a mmio region so it don't share the characteristic of main
>>> memory that phy_addr = virt_addr - PAGE_OFFSET. While they can
>>> both be
>>> mapped through page table using iopa().
>>
>> Right, so when do you know if you'll be using MURAM or normal
>> memory? Why not just keep around a token that is the physical
>> address at the point you make the decision of MURAM vs normal memory.
>
> Yes, that can be a way. But as the virt to phy mapping is only used
> once, it's nothing bad to do it this way.
The problem as I stated before with using iopa() is that its not
supported across platforms.
- k
WARNING: multiple messages have this Message-ID (diff)
From: Kumar Gala <galak@kernel.crashing.org>
To: "Li Yang-r58472" <LeoLi@freescale.com>
Cc: netdev@vger.kernel.org, Tabi Timur-B04825 <timur@freescale.com>,
linuxppc-dev@ozlabs.org
Subject: Re: [PATCH 1/4] ucc_geth: Change private immrbar_virt_to_phys to generic iopa
Date: Thu, 8 Feb 2007 01:16:19 -0600 [thread overview]
Message-ID: <6C343491-B877-4D7D-A46D-B078862160F6@kernel.crashing.org> (raw)
In-Reply-To: <989B956029373F45A0B8AF02970818900D440B@zch01exm26.fsl.freescale.net>
On Feb 8, 2007, at 1:06 AM, Li Yang-r58472 wrote:
>>> MURAM is a mmio region so it don't share the characteristic of main
>>> memory that phy_addr = virt_addr - PAGE_OFFSET. While they can
>>> both be
>>> mapped through page table using iopa().
>>
>> Right, so when do you know if you'll be using MURAM or normal
>> memory? Why not just keep around a token that is the physical
>> address at the point you make the decision of MURAM vs normal memory.
>
> Yes, that can be a way. But as the virt to phy mapping is only used
> once, it's nothing bad to do it this way.
The problem as I stated before with using iopa() is that its not
supported across platforms.
- k
next prev parent reply other threads:[~2007-02-08 7:16 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-06 11:31 [PATCH 1/4] ucc_geth: Change private immrbar_virt_to_phys to generic iopa Li Yang
2007-02-06 14:26 ` Kumar Gala
2007-02-06 14:26 ` Kumar Gala
2007-02-07 9:34 ` Li Yang-r58472
2007-02-07 9:34 ` Li Yang-r58472
2007-02-07 16:36 ` Kumar Gala
2007-02-07 16:36 ` Kumar Gala
2007-02-07 16:43 ` Timur Tabi
2007-02-07 16:43 ` Timur Tabi
2007-02-07 16:49 ` Kumar Gala
2007-02-07 16:49 ` Kumar Gala
2007-02-07 17:03 ` Timur Tabi
2007-02-07 17:03 ` Timur Tabi
2007-02-08 5:52 ` Li Yang-r58472
2007-02-08 5:52 ` Li Yang-r58472
2007-02-08 5:57 ` Kumar Gala
2007-02-08 6:48 ` Li Yang-r58472
2007-02-08 6:48 ` Li Yang-r58472
2007-02-08 6:53 ` Kumar Gala
2007-02-08 6:53 ` Kumar Gala
2007-02-08 7:06 ` Li Yang-r58472
2007-02-08 7:06 ` Li Yang-r58472
2007-02-08 7:16 ` Kumar Gala [this message]
2007-02-08 7:16 ` Kumar Gala
2007-02-08 7:36 ` Li Yang-r58472
2007-02-08 7:36 ` Li Yang-r58472
2007-02-08 7:41 ` Kumar Gala
2007-02-08 7:41 ` Kumar Gala
2007-02-08 9:22 ` Discussion about iopa() Li Yang-r58472
2007-02-08 13:41 ` Timur Tabi
2007-02-09 17:08 ` Dan Malek
2007-02-10 2:37 ` Benjamin Herrenschmidt
2007-02-10 18:04 ` Dan Malek
2007-02-10 21:40 ` Benjamin Herrenschmidt
2007-02-10 22:27 ` Dan Malek
2007-02-10 22:42 ` Benjamin Herrenschmidt
2007-02-08 21:26 ` Benjamin Herrenschmidt
2007-02-09 17:13 ` Dan Malek
2007-02-09 22:06 ` Benjamin Herrenschmidt
2007-02-09 22:46 ` Kumar Gala
2007-02-09 22:51 ` Timur Tabi
2007-02-09 23:06 ` Kumar Gala
2007-02-09 23:10 ` Timur Tabi
2007-02-09 23:19 ` Benjamin Herrenschmidt
2007-02-09 23:22 ` Kumar Gala
2007-02-09 23:33 ` Timur Tabi
2007-02-09 23:43 ` Kumar Gala
2007-02-09 17:06 ` Dan Malek
2007-02-08 13:35 ` [PATCH 1/4] ucc_geth: Change private immrbar_virt_to_phys to generic iopa Timur Tabi
2007-02-08 13:35 ` Timur Tabi
2007-02-09 17:22 ` Dan Malek
2007-02-09 17:26 ` Timur Tabi
2007-02-09 17:26 ` Timur Tabi
2007-02-08 13:27 ` Timur Tabi
2007-02-07 0:19 ` Jeff Garzik
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