On Mon, Jun 07, 2021 at 01:16:50PM +0900, Daejun Park wrote: > Changelog: > > v35 -> v36 > 1. Changed ppn variable type from u64 to __be64. > 2. Added WARN_ON_ONCE() to check for HPB read IO size exceeded. > > v34 -> v35 > 1. Addressed Bart's comments (type casting) > 2. Rebase 5.14 scsi-queue > > v33 -> v34 > Fix warning about NULL check before some freeing functions is not needed. > > v32 -> v33 > 1. Fix wrong usage of scsi_command_normalize_sense. > 2. Addressed Bart's comments (func. name, type casting, parentheses) > > v31 -> v32 > Delete unused parameter of unmap API. > > v30 -> v31 > Delete unnecessary debug message. > > v29 -> v30 > 1. Add support to reuse bio of pre-request. > 2. Delete unreached code in the ufshpb_issue_map_req. > > v28 -> v29 > 1. Remove unused variable that reported by kernel test robot. > > v27 -> v28 > 1. Fix wrong return value of ufshpb_prep. > > v26 -> v27 > 1. Fix wrong refernce of sense buffer in pre_req complete function. > 2. Fix read_id error. > 3. Fix chunk size checking for HPB 1.0. > 4. Mute unnecessary messages before HPB initialization. > > v25 -> v26 > 1. Fix wrong chunk size checking for HPB 1.0. > 2. Fix wrong max data size for HPB single command. > 3. Fix typo error. > > v24 -> v25 > 1. Change write buffer API for unmap region. > 2. Add checking hpb_enable for avoiding unnecessary memory allocation. > 3. Change pr_info to dev_info. > 4. Change default requeue timeout value for HPB read. > 5. Fix wrong offset manipulation on ufshpb_prep_entry. > > v23 -> v24 > 1. Fix build error reported by kernel test robot. > > v22 -> v23 > 1. Add support compatibility of HPB 1.0. > 2. Fix read id for single HPB read command. > 3. Fix number of pre-allocated requests for write buffer. > 4. Add fast path for response UPIU that has same LUN in sense data. > 5. Remove WARN_ON for preventing kernel crash. > 7. Fix wrong argument for read buffer command. > > v21 -> v22 > 1. Add support processing response UPIU in suspend state. > 2. Add support HPB hint from other LU. > 3. Add sending write buffer with 0x03 after HPB init. > > v20 -> v21 > 1. Add bMAX_DATA_SIZE_FOR_HPB_SINGLE_CMD attr. and fHPBen flag support. > > v19 -> v20 > 1. Add documentation for sysfs entries of hpb->stat. > 2. Fix read buffer command for under-sized sub-region. > 3. Fix wrong condition checking for kick map work. > 4. Delete redundant response UPIU checking. > 5. Add LUN checking in response UPIU. > 6. Fix possible deadlock problem due to runtime PM. > 7. Add instant changing of sub-region state from response UPIU. > 8. Fix endian problem in prefetched PPN. > 9. Add JESD220-3A (HPB v2.0) support. > > v18 -> 19 > 1. Fix null pointer error when printing sysfs from non-HPB LU. > 2. Apply HPB read opcode in lrbp->cmd->cmnd (from Can Guo's review). > 3. Rebase the patch on 5.12/scsi-queue. > > v17 -> v18 > Fix build error which reported by kernel test robot. > > v16 -> v17 > 1. Rename hpb_state_lock to rgn_state_lock and move it to corresponding > patch. > 2. Remove redundant information messages. > > v15 -> v16 > 1. Add missed sysfs ABI documentation. > > v14 -> v15 > 1. Remove duplicated sysfs ABI entries in documentation. > 2. Add experiment result of HPB performance testing with iozone. > > v13 -> v14 > 1. Cleanup codes by commentted in Greg's review. > 2. Add documentation for sysfs entries (from Greg's review). > 3. Add experiment result of HPB performance testing. > > v12 -> v13 > 1. Cleanup codes by comments from Can Guo. > 2. Add HPB related descriptor/flag/attributes in sysfs. > 3. Change base commit from 5.10/scsi-queue to 5.11/scsi-queue. > > v11 -> v12 > 1. Fixed to return error value when HPB fails to initialize pinned active > region. > 2. Fixed to disable HPB feature if HPB fails to allocate essential memory > and workqueue. > 3. Fixed to change proper sub-region state when region is already evicted. > > v10 -> v11 > Add a newline at end the last line on Kconfig file. > > v9 -> v10 > 1. Fixed 64-bit division error > 2. Fixed problems commentted in Bart's review. > > v8 -> v9 > 1. Change sysfs initialization. > 2. Change reading descriptor during HPB initialization > 3. Fixed problems commentted in Bart's review. > 4. Change base commit from 5.9/scsi-queue to 5.10/scsi-queue. > > v7 -> v8 > Remove wrongly added tags. > > v6 -> v7 > 1. Remove UFS feature layer. > 2. Cleanup for sparse error. > > v5 -> v6 > Change base commit to b53293fa662e28ae0cdd40828dc641c09f133405 > > v4 -> v5 > Delete unused macro define. > > v3 -> v4 > 1. Cleanup. > > v2 -> v3 > 1. Add checking input module parameter value. > 2. Change base commit from 5.8/scsi-queue to 5.9/scsi-queue. > 3. Cleanup for unused variables and label. > > v1 -> v2 > 1. Change the full boilerplate text to SPDX style. > 2. Adopt dynamic allocation for sub-region data structure. > 3. Cleanup. > > NAND flash memory-based storage devices use Flash Translation Layer (FTL) > to translate logical addresses of I/O requests to corresponding flash > memory addresses. Mobile storage devices typically have RAM with > constrained size, thus lack in memory to keep the whole mapping table. > Therefore, mapping tables are partially retrieved from NAND flash on > demand, causing random-read performance degradation. > > To improve random read performance, JESD220-3 (HPB v1.0) proposes HPB > (Host Performance Booster) which uses host system memory as a cache for the > FTL mapping table. By using HPB, FTL data can be read from host memory > faster than from NAND flash memory. > > The current version only supports the DCM (device control mode). > This patch consists of 3 parts to support HPB feature. > > 1) HPB probe and initialization process > 2) READ -> HPB READ using cached map information > 3) L2P (logical to physical) map management > > In the HPB probe and init process, the device information of the UFS is > queried. After checking supported features, the data structure for the HPB > is initialized according to the device information. > > A read I/O in the active sub-region where the map is cached is changed to > HPB READ by the HPB. > > The HPB manages the L2P map using information received from the > device. For active sub-region, the HPB caches through ufshpb_map > request. For the in-active region, the HPB discards the L2P map. > When a write I/O occurs in an active sub-region area, associated dirty > bitmap checked as dirty for preventing stale read. > > HPB is shown to have a performance improvement of 58 - 67% for random read > workload. [1] > > [1]: > https://www.usenix.org/conference/hotstorage17/program/presentation/jeong > > Daejun Park (4): > scsi: ufs: Introduce HPB feature > scsi: ufs: L2P map management for HPB read > scsi: ufs: Prepare HPB read for cached sub-region > scsi: ufs: Add HPB 2.0 support Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
