From: Reza Arbab <arbab@linux.vnet.ibm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>,
Paul Mackerras <paulus@samba.org>,
Rob Herring <robh+dt@kernel.org>,
Frank Rowand <frowand.list@gmail.com>,
Jonathan Corbet <corbet@lwn.net>,
Andrew Morton <akpm@linux-foundation.org>,
Bharata B Rao <bharata@linux.vnet.ibm.com>,
Nathan Fontenot <nfont@linux.vnet.ibm.com>,
Stewart Smith <stewart@linux.vnet.ibm.com>,
Alistair Popple <apopple@au1.ibm.com>,
Balbir Singh <bsingharora@gmail.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, devicetree@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH v3 5/5] mm: enable CONFIG_MOVABLE_NODE on powerpc
Date: Mon, 26 Sep 2016 19:19:19 -0500 [thread overview]
Message-ID: <20160927001919.sriijnhnu3c2jkck@arbab-laptop> (raw)
In-Reply-To: <1474924541.2857.258.camel@kernel.crashing.org>
On Tue, Sep 27, 2016 at 07:15:41AM +1000, Benjamin Herrenschmidt wrote:
>What is that business with a command line argument ? Do that mean that
>we'll need some magic command line argument to properly handle LPC memory
>on CAPI devices or GPUs ? If yes that's bad ... kernel arguments should
>be a last resort.
Well, movable_node is just a boolean, meaning "allow nodes which contain
only movable memory". It's _not_ like "movable_node=10,13-15,17", if
that's what you were thinking.
>We should have all the information we need from the device-tree.
>
>Note also that we shouldn't need to create those nodes at boot time,
>we need to add the ability to create the whole thing at runtime, we may know
>that there's an NPU with an LPC window in the system but we won't know if it's
>used until it is and for CAPI we just simply don't know until some PCI device
>gets turned into CAPI mode and starts claiming LPC memory...
Yes, this is what is planned for, if I'm understanding you correctly.
In the dt, the PCI device node has a phandle pointing to the memory
node. The memory node describes the window into which we can hotplug at
runtime.
--
Reza Arbab
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prev parent reply other threads:[~2016-09-27 0:19 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-25 18:36 [PATCH v3 0/5] powerpc/mm: movable hotplug memory nodes Reza Arbab
2016-09-25 18:36 ` [PATCH v3 1/5] drivers/of: introduce of_fdt_is_available() Reza Arbab
2016-10-03 15:28 ` Rob Herring
2016-09-25 18:36 ` [PATCH v3 2/5] drivers/of: do not add memory for unavailable nodes Reza Arbab
2016-09-25 18:36 ` [PATCH v3 3/5] powerpc/mm: allow memory hotplug into a memoryless node Reza Arbab
2016-09-25 18:36 ` [PATCH v3 4/5] powerpc/mm: restore top-down allocation when using movable_node Reza Arbab
2016-09-26 15:47 ` Aneesh Kumar K.V
2016-09-26 20:48 ` Reza Arbab
2016-09-26 21:12 ` Benjamin Herrenschmidt
2016-09-27 0:14 ` Reza Arbab
2016-10-04 0:48 ` Balbir Singh
2016-10-04 20:23 ` Reza Arbab
2016-09-25 18:36 ` [PATCH v3 5/5] mm: enable CONFIG_MOVABLE_NODE on powerpc Reza Arbab
2016-09-26 15:48 ` Aneesh Kumar K.V
2016-09-26 21:15 ` Benjamin Herrenschmidt
2016-09-27 0:19 ` Reza Arbab [this message]
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