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From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: "zhichang.yuan" <yuanzhichang@hisilicon.com>
Cc: catalin.marinas@arm.com, will.deacon@arm.com, robh+dt@kernel.org,
	frowand.list@gmail.com, bhelgaas@google.com, rafael@kernel.org,
	arnd@arndb.de, linux-arm-kernel@lists.infradead.org,
	mark.rutland@arm.com, brian.starkey@arm.com, olof@lixom.net,
	lorenzo.pieralisi@arm.com, benh@kernel.crashing.org,
	linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
	linuxarm@huawei.com, devicetree@vger.kernel.org,
	linux-pci@vger.kernel.org, minyard@acm.org,
	zourongrong@gmail.com, john.garry@huawei.com,
	gabriele.paoloni@huawei.com, zhichang.yuan02@gmail.com,
	kantyzc@163.com, xuwei5@hisilicon.com
Subject: Re: [PATCH V8 5/6] ACPI: Support the probing on the devices which apply  indirect-IO
Date: Thu, 30 Mar 2017 22:31:10 +0200	[thread overview]
Message-ID: <1908501.jAQQKvjW4f@aspire.rjw.lan> (raw)
In-Reply-To: <1490887619-61732-6-git-send-email-yuanzhichang@hisilicon.com>

On Thursday, March 30, 2017 11:26:58 PM zhichang.yuan wrote:
> On some platforms(such as Hip06/Hip07), the legacy ISA/LPC devices access I/O
> with some special host-local I/O ports known on x86. To access the I/O
> peripherals, an indirect-IO mechanism is introduced to mapped the host-local
> I/O to system logical/fake PIO similar the PCI MMIO on architectures where no
> separate I/O space exists. Just as PCI MMIO, the host I/O range should be
> registered before probing the downstream devices and set up the I/O mapping.
> But current ACPI bus probing doesn't support these indirect-IO hosts/devices.
> 
> This patch introdueces a new ACPI handler for this device category. Through the
> handler attach callback, the indirect-IO hosts I/O registration is done and
> all peripherals' I/O resources are translated into logic/fake PIO before
> starting the enumeration.

Can you explain to me briefly what exactly this code is expected to be doing?

Thanks,
Rafael

  reply	other threads:[~2017-03-30 20:36 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-30 15:26 [PATCH V8 0/7] LPC: legacy ISA I/O support zhichang.yuan
2017-03-30 15:26 ` [PATCH V8 1/6] LIBIO: Introduce a generic PIO mapping method zhichang.yuan
2017-04-01  5:58   ` kbuild test robot
2017-04-05 12:18     ` zhichang.yuan
2017-04-01  6:31   ` kbuild test robot
2017-03-30 15:26 ` [PATCH V8 2/6] PCI: Apply the new generic I/O management on PCI IO hosts zhichang.yuan
2017-03-30 15:26 ` [PATCH V8 3/6] OF: Add missing I/O range exception for indirect-IO devices zhichang.yuan
2017-03-30 15:26 ` [PATCH V8 4/6] LPC: Support the device-tree LPC host on Hip06/Hip07 zhichang.yuan
2017-03-30 15:26 ` [PATCH V8 5/6] ACPI: Support the probing on the devices which apply indirect-IO zhichang.yuan
2017-03-30 20:31   ` Rafael J. Wysocki [this message]
2017-03-31  6:52     ` zhichang.yuan
2017-03-31 23:02       ` Rafael J. Wysocki
2017-04-01  2:16         ` zhichang.yuan
2017-04-01  9:52           ` Rafael J. Wysocki
2017-04-02 14:58             ` Gabriele Paoloni
2017-04-20 20:57   ` dann frazier
2017-04-21  2:22     ` zhichang.yuan
2017-04-21 17:14       ` Lorenzo Pieralisi
2017-03-30 15:26 ` [PATCH V8 6/6] LPC: Add the ACPI LPC support zhichang.yuan
2017-03-30 21:42 ` [PATCH V8 0/7] LPC: legacy ISA I/O support dann frazier
2017-03-31  6:36   ` zhichang.yuan

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