* [PATCH 5/6] lightnvm: expose device geometry through sysfs
@ 2016-06-10 12:22 Matias Bjørling
0 siblings, 0 replies; 4+ messages in thread
From: Matias Bjørling @ 2016-06-10 12:22 UTC (permalink / raw)
To: linux-block, linux-kernel, axboe, keith.busch, linux-nvme
Cc: Simon A. F. Lund, Matias Bjørling
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dXgtbnZtZQo=
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH 0/6] enable sysfs for lightnvm
@ 2016-06-29 14:51 Matias Bjørling
2016-06-29 14:51 ` [PATCH 5/6] lightnvm: expose device geometry through sysfs Matias Bjørling
0 siblings, 1 reply; 4+ messages in thread
From: Matias Bjørling @ 2016-06-29 14:51 UTC (permalink / raw)
To: linux-block, linux-kernel, axboe, keith.busch, linux-nvme,
dm-devel
Cc: Matias Bjørling
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^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH 5/6] lightnvm: expose device geometry through sysfs
2016-06-29 14:51 [PATCH 0/6] enable sysfs for lightnvm Matias Bjørling
@ 2016-06-29 14:51 ` Matias Bjørling
2016-06-30 20:01 ` J Freyensee
0 siblings, 1 reply; 4+ messages in thread
From: Matias Bjørling @ 2016-06-29 14:51 UTC (permalink / raw)
To: linux-block, linux-kernel, axboe, keith.busch, linux-nvme,
dm-devel
Cc: Simon A. F. Lund, Matias Bjørling
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH 5/6] lightnvm: expose device geometry through sysfs
2016-06-29 14:51 ` [PATCH 5/6] lightnvm: expose device geometry through sysfs Matias Bjørling
@ 2016-06-30 20:01 ` J Freyensee
2016-07-01 7:20 ` Matias Bjørling
0 siblings, 1 reply; 4+ messages in thread
From: J Freyensee @ 2016-06-30 20:01 UTC (permalink / raw)
To: Matias Bjørling, linux-block, linux-kernel, axboe,
keith.busch, linux-nvme, dm-devel
Cc: Simon A. F. Lund
On Wed, 2016-06-29 at 16:51 +0200, Matias Bjørling wrote:
> From: "Simon A. F. Lund" <slund@cnexlabs.com>
>
> For a host to access an Open-Channel SSD, it has to know its
> geometry,
> so that it writes and reads at the appropriate device bounds.
>
> Currently, the geometry information is kept within the kernel, and
> not
> exported to user-space for consumption. This patch exposes the
> configuration through sysfs and enables user-space libraries, such as
> liblightnvm, to use the sysfs implementation to get the geometry of
> an
> Open-Channel SSD.
>
> The sysfs entries are stored within the device hierarchy, and can be
> found using the "lightnvm" device type.
>
> An example configuration looks like this:
>
> /sys/class/nvme/
> └── nvme0n1
> ├── capabilities: 3
> ├── device_mode: 1
> ├── channel_parallelism: 0
> ├── erase_max: 1000000
> ├── erase_typ: 1000000
> ├── flash_media_type: 0
> ├── media_capabilities: 0x00000001
> ├── media_type: 0
> ├── multiplane: 0x00010101
> ├── num_blocks: 1022
> ├── num_channels: 1
> ├── num_luns: 4
> ├── num_pages: 64
> ├── num_planes: 1
> ├── page_size: 4096
> ├── prog_max: 100000
> ├── prog_typ: 100000
> ├── read_max: 10000
> ├── read_typ: 10000
> ├── sector_oob_size: 0
> ├── sector_size: 4096
> ├── media_manager: gennvm
> ├── ppa_format: 0x380830082808001010102008
> ├── vendor_opcode: 0
> └── version: 1
>
That is an awful lot of new things to add under nvme0n1-type sysfs
entries when there is already a decent amount of stuff under it.
Any chance these new things could be stuck under a separate sysfs
directory under each nvmeXnY device? If these things are mainly
beneficial to LightNVM, it will be easier for a LightNVM newbie to
find, recognize, and consider all the important things in an Open
Channel SSD solution if it's under a separate directory. And for
current SSD solutions that don't seem to need these things exposed in
sysfs for operation, it will make what is directly under nvmeXnY
directories less cluttered.
Thanks,
Jay
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH 5/6] lightnvm: expose device geometry through sysfs
2016-06-30 20:01 ` J Freyensee
@ 2016-07-01 7:20 ` Matias Bjørling
0 siblings, 0 replies; 4+ messages in thread
From: Matias Bjørling @ 2016-07-01 7:20 UTC (permalink / raw)
To: J Freyensee, linux-block, linux-kernel, axboe, keith.busch,
linux-nvme, dm-devel
Cc: Simon A. F. Lund
On 06/30/2016 10:01 PM, J Freyensee wrote:
> On Wed, 2016-06-29 at 16:51 +0200, Matias Bjørling wrote:
>> From: "Simon A. F. Lund" <slund@cnexlabs.com>
>>
>> For a host to access an Open-Channel SSD, it has to know its
>> geometry,
>> so that it writes and reads at the appropriate device bounds.
>>
>> Currently, the geometry information is kept within the kernel, and
>> not
>> exported to user-space for consumption. This patch exposes the
>> configuration through sysfs and enables user-space libraries, such as
>> liblightnvm, to use the sysfs implementation to get the geometry of
>> an
>> Open-Channel SSD.
>>
>> The sysfs entries are stored within the device hierarchy, and can be
>> found using the "lightnvm" device type.
>>
>> An example configuration looks like this:
>>
>> /sys/class/nvme/
>> └── nvme0n1
>> ├── capabilities: 3
>> ├── device_mode: 1
>> ├── channel_parallelism: 0
>> ├── erase_max: 1000000
>> ├── erase_typ: 1000000
>> ├── flash_media_type: 0
>> ├── media_capabilities: 0x00000001
>> ├── media_type: 0
>> ├── multiplane: 0x00010101
>> ├── num_blocks: 1022
>> ├── num_channels: 1
>> ├── num_luns: 4
>> ├── num_pages: 64
>> ├── num_planes: 1
>> ├── page_size: 4096
>> ├── prog_max: 100000
>> ├── prog_typ: 100000
>> ├── read_max: 10000
>> ├── read_typ: 10000
>> ├── sector_oob_size: 0
>> ├── sector_size: 4096
>> ├── media_manager: gennvm
>> ├── ppa_format: 0x380830082808001010102008
>> ├── vendor_opcode: 0
>> └── version: 1
>>
>
> That is an awful lot of new things to add under nvme0n1-type sysfs
> entries when there is already a decent amount of stuff under it.
>
You are right. These are rightfully placed under /lightnvm in the sysfs
path. The description is wrong, will update it. Thanks Jay.
> Any chance these new things could be stuck under a separate sysfs
> directory under each nvmeXnY device? If these things are mainly
> beneficial to LightNVM, it will be easier for a LightNVM newbie to
> find, recognize, and consider all the important things in an Open
> Channel SSD solution if it's under a separate directory. And for
> current SSD solutions that don't seem to need these things exposed in
> sysfs for operation, it will make what is directly under nvmeXnY
> directories less cluttered.
>
> Thanks,
> Jay
>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2016-07-01 7:21 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2016-06-10 12:22 [PATCH 5/6] lightnvm: expose device geometry through sysfs Matias Bjørling
-- strict thread matches above, loose matches on Subject: below --
2016-06-29 14:51 [PATCH 0/6] enable sysfs for lightnvm Matias Bjørling
2016-06-29 14:51 ` [PATCH 5/6] lightnvm: expose device geometry through sysfs Matias Bjørling
2016-06-30 20:01 ` J Freyensee
2016-07-01 7:20 ` Matias Bjørling
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