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If the logical address of a read I/O belongs to an active sub-region, the HPB driver modifies the read I/O command to an HPB read. The driver modifies the UFS UPIU instead of modifying the existing SCSI command. In HPB version 1.0, the maximum read I/O size that can be converted to HPB read is 4KB. The dirty map of the active sub-region prevents an incorrect HPB read that has stale physical page number which is updated by previous write I/O. [mkp: REQ_OP_DRV_* and blk_rq_is_passthrough()] Link: https://lore.kernel.org/r/20210712085936epcms2p4b0ec5c8cecdeea6cc043d684363842b6@epcms2p4 Tested-by: Bean Huo <beanhuo@micron.com> Tested-by: Can Guo <cang@codeaurora.org> Tested-by: Stanley Chu <stanley.chu@mediatek.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Can Guo <cang@codeaurora.org> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Bean Huo <beanhuo@micron.com> Reviewed-by: Stanley Chu <stanley.chu@mediatek.com> Acked-by: Avri Altman <Avri.Altman@wdc.com> Signed-off-by: Daejun Park <daejun7.park@samsung.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.