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authorSimon A. F. Lund <slund@cnexlabs.com>2016-09-16 15:25:08 +0300
committerJens Axboe <axboe@fb.com>2016-09-21 16:57:31 +0300
commit40267efddc296190d50c61d96daf277151447cf6 (patch)
treed461e3fd467fa8ba7c0a316a399e6560888839b7 /include/linux/lightnvm.h
parentb0b4e09c1ae71c4ec33df0616b830ae050006e9b (diff)
downloadlinux-40267efddc296190d50c61d96daf277151447cf6.tar.xz
lightnvm: expose device geometry through sysfs
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 ├── 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 ├── max_phys_secs: 64 └── version: 1 Signed-off-by: Simon A. F. Lund <slund@cnexlabs.com> Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/lightnvm.h')
-rw-r--r--include/linux/lightnvm.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 5afc2634f332..d190786e4ad8 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -352,7 +352,10 @@ struct nvm_dev {
/* Backend device */
struct request_queue *q;
+ struct device dev;
+ struct device *parent_dev;
char name[DISK_NAME_LEN];
+ void *private_data;
struct mutex mlock;
spinlock_t lock;