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 18:11:02 +0200 [thread overview]
Message-ID: <20200508161102.GA23094@alpha.franken.de> (raw)
In-Reply-To: <20200508114438.3092215-2-jiaxun.yang@flygoat.com>
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.
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
next prev parent reply other threads:[~2020-05-08 16:11 UTC|newest]
Thread overview: 27+ 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 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 [this message]
2020-05-08 16:22 ` Jiaxun Yang
2020-05-08 16:52 ` Thomas Bogendoerfer
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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