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From: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
To: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-mips@vger.kernel.org, chenhc@lemote.com, john.garry@huawei.com
Subject: Re: [PATCH RESEND v3 2/3] MIPS: Introduce PCI_IO_VMMAP
Date: Fri, 8 May 2020 18:52:35 +0200	[thread overview]
Message-ID: <20200508165235.GA24425@alpha.franken.de> (raw)
In-Reply-To: <18B84249-7CA1-411E-B595-6E215D8C9C34@flygoat.com>

On Sat, May 09, 2020 at 12:22:25AM +0800, Jiaxun Yang wrote:
> 
> 
> 于 2020年5月9日 GMT+08:00 上午12:11:02, Thomas Bogendoerfer <tsbogend@alpha.franken.de> 写到:
> >On Fri, May 08, 2020 at 07:44:37PM +0800, Jiaxun Yang wrote:
> >> Define PCI_IOBASE for MIPS at the strat of kernel mapping segment.
> >> That would allow virt address of I/O ports to be dynamicly mapped.
> >> So we'll be able to combine multiple MMIO ranges into I/O ports
> >> and thus we can take advantage of logic_pio mechanism.
> >
> >What is the advantage ?
> >
> >From my point of view this will be slower because of TLB faults for
> >PCI IO space accesses.
> 
> Advantage is we can use logic_pio to manage multiple I/O Port ranges.

and what exactly does this buy us ? I looked at lib/logic_pio.c and
there didn't appear anything in my mind other than yet another
interface for doing the same thing...

> That can help us reuse generic PCI I/O design.

please explain this.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]

  reply	other threads:[~2020-05-08 16:52 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-26 11:47 [PATCH 0/4] MIPS: Loongson64: Use logic_pio Jiaxun Yang
2020-04-26 11:47 ` [PATCH 1/4] MIPS: Massage address spaces headers Jiaxun Yang
2020-04-26 11:47 ` [PATCH 2/4] MIPS: Introduce PCI_IO_VMMAP Jiaxun Yang
2020-04-26 11:47 ` [PATCH 3/4] lib: logic_pio: Introduce MMIO_LOWER_RESERVED Jiaxun Yang
2020-04-27 10:43   ` John Garry
2020-04-27 11:03     ` Jiaxun Yang
2020-04-27 11:54       ` John Garry
2020-04-27 11:54         ` John Garry
2020-04-27 11:54         ` John Garry
2020-04-27 12:21         ` Jiaxun Yang
2020-04-27 12:21           ` Jiaxun Yang
2020-04-27 12:21           ` Jiaxun Yang
2020-04-26 11:47 ` [PATCH 4/4] MIPS: Loongson64: Enable PCI_IO_VMMAP Jiaxun Yang
2020-04-30  0:57 ` [PATCH v3 1/3] MIPS: Move VMALLOC_START into spaces.h Jiaxun Yang
2020-04-30  0:57   ` [PATCH v3 2/3] MIPS: Introduce PCI_IO_VMMAP Jiaxun Yang
2020-04-30  0:57   ` [PATCH v3 3/3] MIPS: Loongson64: Enable PCI_IO_VMMAP Jiaxun Yang
2020-05-08 11:44 ` [PATCH RESEND v3 1/3] MIPS: Move VMALLOC_START into spaces.h Jiaxun Yang
2020-05-08 11:44   ` [PATCH RESEND v3 2/3] MIPS: Introduce PCI_IO_VMMAP Jiaxun Yang
2020-05-08 16:11     ` Thomas Bogendoerfer
2020-05-08 16:22       ` Jiaxun Yang
2020-05-08 16:52         ` Thomas Bogendoerfer [this message]
2020-05-08 17:09           ` Jiaxun Yang
2020-05-14 14:21             ` Thomas Bogendoerfer
2020-05-14 14:56               ` Jiaxun Yang
2020-05-14 13:20     ` Jiaxun Yang
2020-05-08 11:44   ` [PATCH RESEND v3 3/3] MIPS: Loongson64: Enable PCI_IO_VMMAP Jiaxun Yang
2021-01-13 18:02     ` logical PIO code for mips question (was Re: [PATCH RESEND v3 3/3] MIPS: Loongson64: Enable PCI_IO_VMMAP) John Garry
2021-01-14  0:13       ` Jiaxun Yang
2021-01-14  9:18         ` John Garry
2021-01-14 11:10           ` Jiaxun Yang
2021-01-14 11:20             ` John Garry

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