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a45f937110
Current UFS IRQ handler is completely wrapped by host lock, and because ufshcd_send_command() is also protected by host lock, when IRQ handler fires, not only the CPU running the IRQ handler cannot send new requests, the rest CPUs can neither. Move the host lock wrapping the IRQ handler into specific branches, i.e., ufshcd_uic_cmd_compl(), ufshcd_check_errors(), ufshcd_tmc_handler() and ufshcd_transfer_req_compl(). Meanwhile, to further reduce occpuation of host lock in ufshcd_transfer_req_compl(), host lock is no longer required to call __ufshcd_transfer_req_compl(). As per test, the optimization can bring considerable gain to random read/write performance. Link: https://lore.kernel.org/r/1621845419-14194-3-git-send-email-cang@codeaurora.org Cc: Stanley Chu <stanley.chu@mediatek.com> Reported-by: kernel test robot <lkp@intel.com> Reviewed-by: Bean Huo <beanhuo@micron.com> Reviewed-by: Stanley Chu <stanley.chu@mediatek.com> Co-developed-by: Asutosh Das <asutoshd@codeaurora.org> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org> Signed-off-by: Can Guo <cang@codeaurora.org> 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.