hulk inclusion
category: feature
feature: ARM MPAM support
bugzilla: 48265
CVE: NA

--------------------------------

Currently we use partid and pmg (Performance Monitoring Group) to filter
some performance events so that the performance of a particular partid
and pmg can be monitored, but pmg looks useless except for making a
filter with partid, especially when pmg varies in different MPAM resources,
it makes difficult to allocate pmg resource when creating new mon group
in resctrl sysfs, even causes a lot of waste.

So we use a software-defined sd_closid instead of 32-bit integer to label
each rdtgroup (including mon group), sd_closid include intpartid for
allocation and reqpartid for synchronizing configuration and monitoring,
Given MPAM has narrowing feature, also includes the concept (hw_reqpartid,
hw_intpartid we named), when narrowing is not supported, number of intpartid
and reqpartid equals to hw_reqpartid, otherwise intpartid and reqpartid is
related to minimum number of both hw_reqpartid and hw_intpartid supported
across different resources, by using this way, not only we solve above
problem but also use relax reqpartid for creating new mon group. additionally,
pmg is also preferred when it is available.

e.g.
     hw_intpartid:  0  1  2  3  4  5  6  7
     hw_reqpartid:  0  1  2  3  4  5  6  7  8  9  10 11 12 13 14 15

                    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
                                            |  |  |  |  |  |  |  |
resctrl ctrl group: p0 p1 p2 p3 p4 p5 p6 p7 |  |  |  |  |  |  |  |
                          |     |
resctrl mon group:        |     +-----------------------m4 m5 m6 m7
                          +-----------------m0 m1 m2 m3
                          In this case, use extra reqpartid to create
                          m0, m1, m2, m3 mon group for p2 ctrl group,
                          and m4, m5, m6, m7 for p4.

As we know reqpartid both supports allocating and monitoring filter, we
should synchronize config of ctrl group with child mon groups under this
design, each mon group's configuration indexed by a reqpartid that called
slave is closely following it's father ctrl group that called master
whenever configuration changes. not only that, we let task_struct keep
both intpartid and reqpartid so we can know if tasks belong to a same
ctrl group through intpartid and change cpu's partid by writing MPAMx_ELx
through reqpartid when tasks switching.
Signed-off-by: NWang ShaoBo <bobo.shaobowang@huawei.com>
Reviewed-by: NXiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: NCheng Jian <cj.chengjian@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>