[v8,0/2] drivers/perf: hisi: Add support for PCIe PMU

This patchset adds support for HiSilicon PCIe Performance Monitoring
Unit(PMU). It is a PCIe Root Complex integrated End Point(RCiEP) device
added on Hip09. Each PCIe Core has a PMU RCiEP to monitor multi root
ports and all Endpoints downstream these root ports.

HiSilicon PCIe PMU is supported to collect performance data of PCIe bus,
such as: bandwidth, latency etc.

Changes since v7:
- Drop headerfile cpumask.h and cpuhotplug.h.
- Rename events in perf list: bw->flux, lat->delay, as driver doesn't
  process bandwidth and average latency data.
- Link: https://lore.kernel.org/linux-arm-kernel/1624532384-43002-1-git-send-email-liuqi115@huawei.com/

Changes since v6:
- Move the driver to drivers/perf/hisilicon.
- Treat content in PMU counter and ext_counter as different PMU events, and
  export them separately.
- Address the comments from Will and Krzysztof.
- Link: https://lore.kernel.org/linux-arm-kernel/1622467951-32114-1-git-send-email-liuqi115@huawei.com/

Changes since v5:
- Fix some errors when build under ARCH=xtensa.
- Link: https://lore.kernel.org/linux-arm-kernel/1621946795-14046-1-git-send-email-liuqi115@huawei.com/

Changes since v4:
- Replace irq_set_affinity_hint() with irq_set_affinity().
- Link: https://lore.kernel.org/linux-arm-kernel/1621417741-5229-1-git-send-email-liuqi115@huawei.com/

Changes since v3:
- Fix some warnings when build under 32bits architecture.
- Address the comments from John.
- Link: https://lore.kernel.org/linux-arm-kernel/1618490885-44612-1-git-send-email-liuqi115@huawei.com/

Changes since v2:
- Address the comments from John.
- Link: https://lore.kernel.org/linux-arm-kernel/1617959157-22956-1-git-send-email-liuqi115@huawei.com/

Changes since v1:
- Drop the internal Reviewed-by tag.
- Fix some build warnings when W=1.
- Link: https://lore.kernel.org/linux-arm-kernel/1617788943-52722-1-git-send-email-liuqi115@huawei.com/

Qi Liu (2):
  docs: perf: Add description for HiSilicon PCIe PMU driver
  drivers/perf: hisi: Add driver for HiSilicon PCIe PMU

 Documentation/admin-guide/perf/hisi-pcie-pmu.rst | 104 +++
 MAINTAINERS                                      |   2 +
 drivers/perf/hisilicon/Kconfig                   |   9 +
 drivers/perf/hisilicon/Makefile                  |   2 +
 drivers/perf/hisilicon/hisi_pcie_pmu.c           | 967 +++++++++++++++++++++++
 include/linux/cpuhotplug.h                       |   1 +
 6 files changed, 1085 insertions(+)
 create mode 100644 Documentation/admin-guide/perf/hisi-pcie-pmu.rst
 create mode 100644 drivers/perf/hisilicon/hisi_pcie_pmu.c