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Updates to resctrl's software controller follow the same path as other configuration updates, but they don't modify the hardware state. rdtgroup_schemata_write() uses parse_line() and the resource's parse_ctrlval() function to stage the configuration. resctrl_arch_update_domains() then updates the mbps_val[] array instead, and resctrl_arch_update_domains() skips the rdt_ctrl_update() call that would update hardware. This complicates the interface between resctrl's filesystem parts and architecture specific code. It should be possible for mba_sc to be completely implemented by the filesystem parts of resctrl. This would allow it to work on a second architecture with no additional code. resctrl_arch_update_domains() using the mbps_val[] array prevents this. Change parse_bw() to write the configuration value directly to the mbps_val[] array in the domain structure. Change rdtgroup_schemata_write() to skip the call to resctrl_arch_update_domains(), meaning all the mba_sc specific code in resctrl_arch_update_domains() can be removed. On the read-side, show_doms() and update_mba_bw() are changed to read the mbps_val[] array from the domain structure. With this, resctrl_arch_get_config() no longer needs to consider mba_sc resources. Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Jamie Iles <quic_jiles@quicinc.com> Reviewed-by: Shaopeng Tan <tan.shaopeng@fujitsu.com> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Tested-by: Xin Hao <xhao@linux.alibaba.com> Tested-by: Shaopeng Tan <tan.shaopeng@fujitsu.com> Tested-by: Cristian Marussi <cristian.marussi@arm.com> Link: https://lore.kernel.org/r/20220902154829.30399-10-james.morse@arm.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.