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From: Andrew Morton <akpm@linux-foundation.org>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>,
	peterz@infradead.org, dave.hansen@linux.intel.com,
	ard.biesheuvel@linaro.org, linux-mm@kvack.org,
	linux-nvdimm@lists.01.org, joao.m.martins@oracle.com,
	linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
	dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v4 15/23] device-dax: Add resize support
Date: Fri, 21 Aug 2020 15:56:49 -0700	[thread overview]
Message-ID: <20200821155649.6a9fe5eb22a013833f94427c@linux-foundation.org> (raw)
In-Reply-To: <159643102625.4062302.7431838945566033852.stgit@dwillia2-desk3.amr.corp.intel.com>

On Sun, 02 Aug 2020 22:03:46 -0700 Dan Williams <dan.j.williams@intel.com> wrote:

> Make the device-dax 'size' attribute writable to allow capacity to be
> split between multiple instances in a region. The intended consumers of
> this capability are users that want to split a scarce memory resource
> between device-dax and System-RAM access, or users that want to have
> multiple security domains for a large region.
> 
> By default the hmem instance provider allocates an entire region to the
> first instance. The process of creating a new instance (assuming a
> region-id of 0) is find the region and trigger the 'create' attribute
> which yields an empty instance to configure. For example:
> 
>     cd /sys/bus/dax/devices
>     echo dax0.0 > dax0.0/driver/unbind
>     echo $new_size > dax0.0/size
>     echo 1 > $(readlink -f dax0.0)../dax_region/create
>     seed=$(cat $(readlink -f dax0.0)../dax_region/seed)
>     echo $new_size > $seed/size
>     echo dax0.0 > ../drivers/{device_dax,kmem}/bind
>     echo dax0.1 > ../drivers/{device_dax,kmem}/bind
> 
> Instances can be destroyed by:
> 
>     echo $device > $(readlink -f $device)../dax_region/delete

This userspace interface doesn't seem to be documented anywhere, so
there's nothing to update for this patch :(


  reply	other threads:[~2020-08-21 22:56 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-03  5:02 [PATCH v4 00/23] device-dax: Support sub-dividing soft-reserved ranges Dan Williams
2020-08-03  5:02 ` [PATCH v4 01/23] x86/numa: Cleanup configuration dependent command-line options Dan Williams
2020-08-03  5:02 ` [PATCH v4 02/23] x86/numa: Add 'nohmat' option Dan Williams
2020-08-03  5:02 ` [PATCH v4 03/23] efi/fake_mem: Arrange for a resource entry per efi_fake_mem instance Dan Williams
2020-08-03  5:02 ` [PATCH v4 04/23] ACPI: HMAT: Refactor hmat_register_target_device to hmem_register_device Dan Williams
2020-08-03  5:02 ` [PATCH v4 05/23] resource: Report parent to walk_iomem_res_desc() callback Dan Williams
2020-08-03  5:02 ` [PATCH v4 06/23] mm/memory_hotplug: Introduce default phys_to_target_node() implementation Dan Williams
2020-08-03  5:03 ` [PATCH v4 07/23] ACPI: HMAT: Attach a device for each soft-reserved range Dan Williams
2020-08-03  5:03 ` [PATCH v4 08/23] device-dax: Drop the dax_region.pfn_flags attribute Dan Williams
2020-08-03  5:03 ` [PATCH v4 09/23] device-dax: Move instance creation parameters to 'struct dev_dax_data' Dan Williams
2020-08-03  5:03 ` [PATCH v4 10/23] device-dax: Make pgmap optional for instance creation Dan Williams
2020-08-03  5:03 ` [PATCH v4 11/23] device-dax: Kill dax_kmem_res Dan Williams
2020-08-21 10:06   ` David Hildenbrand
2020-09-08 15:33     ` Joao Martins
2020-09-08 18:03       ` David Hildenbrand
2020-09-23  8:04       ` David Hildenbrand
2020-09-23 21:41         ` Dan Williams
2020-09-24  7:25           ` David Hildenbrand
2020-09-24 13:54             ` Dan Williams
2020-09-24 18:12               ` David Hildenbrand
2020-09-24 21:26                 ` Dan Williams
2020-09-24 21:41                   ` David Hildenbrand
2020-09-24 21:50                     ` Dan Williams
2020-09-25  8:54                       ` David Hildenbrand
2020-08-03  5:03 ` [PATCH v4 12/23] device-dax: Add an allocation interface for device-dax instances Dan Williams
2020-08-03  5:03 ` [PATCH v4 13/23] device-dax: Introduce 'seed' devices Dan Williams
2020-08-03  5:03 ` [PATCH v4 14/23] drivers/base: Make device_find_child_by_name() compatible with sysfs inputs Dan Williams
2020-08-03  5:03 ` [PATCH v4 15/23] device-dax: Add resize support Dan Williams
2020-08-21 22:56   ` Andrew Morton [this message]
2020-08-03  5:03 ` [PATCH v4 16/23] mm/memremap_pages: Convert to 'struct range' Dan Williams
2020-08-03  5:03 ` [PATCH v4 17/23] mm/memremap_pages: Support multiple ranges per invocation Dan Williams
2020-08-03  5:04 ` [PATCH v4 18/23] device-dax: Add dis-contiguous resource support Dan Williams
2020-08-03  5:04 ` [PATCH v4 19/23] device-dax: Introduce 'mapping' devices Dan Williams
2020-08-03  5:04 ` [PATCH v4 20/23] device-dax: Make align a per-device property Dan Williams
2020-08-03  5:04 ` [PATCH v4 21/23] device-dax: Add an 'align' attribute Dan Williams
2020-08-03  5:04 ` [PATCH v4 22/23] dax/hmem: Introduce dax_hmem.region_idle parameter Dan Williams
2020-08-03  5:04 ` [PATCH v4 23/23] device-dax: Add a range mapping allocation attribute Dan Williams
2020-08-03  7:47 ` [PATCH v4 00/23] device-dax: Support sub-dividing soft-reserved ranges David Hildenbrand
2020-08-20  1:53   ` Dan Williams
2020-08-21 10:15     ` David Hildenbrand
2020-08-21 18:27       ` Dan Williams
2020-08-21 18:30         ` David Hildenbrand
2020-08-21 21:17           ` Dan Williams
2020-08-21 21:33             ` David Hildenbrand
2020-08-21 21:42               ` David Hildenbrand
2020-08-21 21:43               ` David Hildenbrand
2020-08-21 21:46               ` David Hildenbrand
2020-08-21 23:21     ` Andrew Morton
2020-08-22  2:32       ` Leizhen (ThunderTown)
2020-09-08 10:45       ` David Hildenbrand
2020-09-23  0:43         ` Dan Williams

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