From: "Maciej W. Rozycki" <macro@orcam.me.uk>
To: Rob Herring <robh@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
Palmer Dabbelt <palmer@dabbelt.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Stafford Horne <shorne@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Guo Ren <guoren@kernel.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Richard Weinberger <richard@nod.at>,
Anton Ivanov <anton.ivanov@cambridgegreys.com>,
Johannes Berg <johannes@sipsolutions.net>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-csky@vger.kernel.org,
linux-riscv <linux-riscv@lists.infradead.org>,
linux-um <linux-um@lists.infradead.org>,
PCI <linux-pci@vger.kernel.org>,
"open list:GENERIC INCLUDE/ASM HEADER FILES"
<linux-arch@vger.kernel.org>
Subject: Re: [PATCH v3 2/2] asm-generic: Add new pci.h and use it
Date: Fri, 22 Jul 2022 23:41:54 +0100 (BST) [thread overview]
Message-ID: <alpine.DEB.2.21.2207222328230.48997@angie.orcam.me.uk> (raw)
In-Reply-To: <CAL_JsqKZoru2VZLeovPnQWe01ZMdw0krq0tcPx1O6YFUKa-L0g@mail.gmail.com>
On Fri, 22 Jul 2022, Rob Herring wrote:
> P.S. I really wish I/O space would disappear completely.
Some systems make it happen already, such as the POWER9 platform and its
PHB4 host bridge (which doesn't handle PCIe TLP I/O read or write commands
at all), however some PCI/e devices do require I/O space, such as IEEE
1284 parallel port adapters. Some PCI devices dating back as far as to
1990s provide dual mapping of their resources via an I/O and a memory BAR
both at a time, so we can choose which to use depending on circumstances.
FWIW,
Maciej
prev parent reply other threads:[~2022-07-22 22:42 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-18 0:41 [PATCH v3 0/2] Updates for asm-generic/pci.h Stafford Horne
2022-07-18 0:41 ` [PATCH v3 2/2] asm-generic: Add new pci.h and use it Stafford Horne
2022-07-19 15:58 ` Palmer Dabbelt
2022-07-21 22:05 ` Stafford Horne
2022-07-21 22:53 ` Palmer Dabbelt
2022-07-21 23:06 ` Rob Herring
2022-07-22 10:53 ` Arnd Bergmann
2022-07-22 15:27 ` Palmer Dabbelt
2022-07-22 16:36 ` Rob Herring
2022-07-22 19:23 ` Maciej W. Rozycki
2022-07-22 19:42 ` Rob Herring
2022-07-22 22:28 ` Maciej W. Rozycki
2022-07-22 19:55 ` Arnd Bergmann
2022-07-22 21:39 ` Jessica Clarke
2022-07-22 21:44 ` Rob Herring
2022-07-22 22:41 ` Maciej W. Rozycki [this message]
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