kernel/git/stable/linux.git/drivers/lightnvm/pblk-map.c, branch master

remove the lightnvm subsystem

2021-08-14T21:54:09+00:00

Lightnvm supports the OCSSD 1.x and 2.0 specs which were early attempts to produce Open Channel SSDs and never made it into the NVMe spec proper. They have since been superceeded by NVMe enhancements such as ZNS support. Remove the support per the deprecation schedule. Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20210812132308.38486-1-hch@lst.de Reviewed-by: Matias Bjørling Reviewed-by: Javier González Signed-off-by: Jens Axboe

lightnvm: pblk: ensure that erase is chunk aligned

2019-05-06T16:19:17+00:00

The sector bits in the erase command may be uninitialized are uninitialized, causing the erase LBA to be unaligned to the chunk size. This is unexpected situation, since erase shall always be chunk aligned based on OCSSD the 2.0 specification. Signed-off-by: Igor Konopko Reviewed-by: Javier González Reviewed-by: Hans Holmberg Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: pblk: fix race condition on GC

2019-02-11T15:18:08+00:00

This patch fixes a race condition where a write is mapped to the last sectors of a line. The write is synced to the device but the L2P is not updated yet. When the line is garbage collected before the L2P update is performed, the sectors are ignored by the GC logic and the line is freed before all sectors are moved. When the L2P is finally updated, it contains a mapping to a freed line, subsequent reads of the corresponding LBAs fail. This patch introduces a per line counter specifying the number of sectors that are synced to the device but have not been updated in the L2P. Lines with a counter of greater than zero will not be selected for GC. Signed-off-by: Heiner Litz Reviewed-by: Hans Holmberg Reviewed-by: Javier González Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: pblk: support packed metadata

2018-12-11T19:22:35+00:00

pblk performs recovery of open lines by storing the LBA in the per LBA metadata field. Recovery therefore only works for drives that has this field. This patch adds support for packed metadata, which store l2p mapping for open lines in last sector of every write unit and enables drives without per IO metadata to recover open lines. After this patch, drives with OOB size <16B will use packed metadata and metadata size larger than16B will continue to use the device per IO metadata. Reviewed-by: Javier González Signed-off-by: Igor Konopko Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: pblk: add helpers for OOB metadata

2018-12-11T19:22:35+00:00

pblk currently assumes that size of OOB metadata on drive is always equal to size of pblk_sec_meta struct. This commit add helpers which will allow to handle different sizes of OOB metadata on drive in the future. After this patch only OOB metadata equal to 16 bytes is supported. Reviewed-by: Javier González Signed-off-by: Igor Konopko Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: pblk: stop writes gracefully when running out of lines

2018-12-11T19:22:33+00:00

If mapping fails (i.e. when running out of lines), handle the error and stop writing. Signed-off-by: Hans Holmberg Reviewed-by: Javier González Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: pblk: add SPDX license tag

2018-10-09T14:25:08+00:00

Add GLP-2.0 SPDX license tag to all pblk files Signed-off-by: Javier González Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: pblk: remove debug from pblk_[down/up]_page

2018-10-09T14:25:07+00:00

Remove the debug only iteration within __pblk_down_page, which then allows us to reduce the number of arguments down to pblk and the parallel unit from the functions that calls it. Simplifying the callers logic considerably. Also, rename the functions pblk_[down/up]_page to pblk_[down/up]_chunk, to communicate that it manages the write pointer of the chunk. Note that it also protects the parallel unit such that at most one chunk is active per parallel unit. Signed-off-by: Matias Bjørling Reviewed-by: Javier González Signed-off-by: Jens Axboe

lightnvm: introduce nvm_rq_to_ppa_list

2018-10-09T14:25:07+00:00

There is a number of places in the lightnvm subsystem where the user iterates over the ppa list. Before iterating, the user must know if it is a single or multiple LBAs due to vector commands using either the nvm_rq ->ppa_addr or ->ppa_list fields on command submission, which leads to open-coding the if/else statement. Instead of having multiple if/else's, move it into a function that can be called by its users. A nice side effect of this cleanup is that this patch fixes up a bunch of cases where we don't consider the single-ppa case in pblk. Signed-off-by: Hans Holmberg Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: pblk: fail gracefully on line alloc. failure

2018-06-01T13:43:53+00:00

In the event of a line failing to allocate, fail gracefully and stop the pipeline to avoid more write failing in the same place. Signed-off-by: Javier González Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe