perf: Fujitsu: Add the Uncore PMU driver

This adds a new dynamic PMU to the Perf Events framework to program and
control the Uncore PMUs in Fujitsu chips.

This driver exports formatting and event information to sysfs so it can
be used by the perf user space tools with the syntaxes:

perf stat -e pci_iod0_pci0/ea-pci/ ls
perf stat -e pci_iod0_pci0/event=0x80/ ls
perf stat -e mac_iod0_mac0_ch0/ea-mac/ ls
perf stat -e mac_iod0_mac0_ch0/event=0x80/ ls

FUJITSU-MONAKA PMU Events Specification v1.1 URL:
https://github.com/fujitsu/FUJITSU-MONAKA

Reviewed-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Koichi Okuno <fj2767dz@fujitsu.com>
Signed-off-by: Will Deacon <will@kernel.org>

2 files changed, 111 insertions, 0 deletions

diff --git a/Documentation/admin-guide/perf/fujitsu_uncore_pmu.rst b/Documentation/admin-guide/perf/fujitsu_uncore_pmu.rst
new file mode 100644
index 000000000000..46595b788d3a
--- /dev/null
+++ b/Documentation/admin-guide/perf/fujitsu_uncore_pmu.rst
@@ -0,0 +1,110 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+================================================
+Fujitsu Uncore Performance Monitoring Unit (PMU)
+================================================
+
+This driver supports the Uncore MAC PMUs and the Uncore PCI PMUs found
+in Fujitsu chips.
+Each MAC PMU on these chips is exposed as a uncore perf PMU with device name
+mac_iod<iod>_mac<mac>_ch<ch>.
+And each PCI PMU on these chips is exposed as a uncore perf PMU with device name
+pci_iod<iod>_pci<pci>.
+
+The driver provides a description of its available events and configuration
+options in sysfs, see /sys/bus/event_sources/devices/mac_iod<iod>_mac<mac>_ch<ch>/
+and /sys/bus/event_sources/devices/pci_iod<iod>_pci<pci>/.
+This driver exports:
+- formats, used by perf user space and other tools to configure events
+- events, used by perf user space and other tools to create events
+  symbolically, e.g.:
+    perf stat -a -e mac_iod0_mac0_ch0/event=0x21/ ls
+    perf stat -a -e pci_iod0_pci0/event=0x24/ ls
+- cpumask, used by perf user space and other tools to know on which CPUs
+  to open the events
+
+This driver supports the following events for MAC:
+- cycles
+  This event counts MAC cycles at MAC frequency.
+- read-count
+  This event counts the number of read requests to MAC.
+- read-count-request
+  This event counts the number of read requests including retry to MAC.
+- read-count-return
+  This event counts the number of responses to read requests to MAC.
+- read-count-request-pftgt
+  This event counts the number of read requests including retry with PFTGT
+  flag.
+- read-count-request-normal
+  This event counts the number of read requests including retry without PFTGT
+  flag.
+- read-count-return-pftgt-hit
+  This event counts the number of responses to read requests which hit the
+  PFTGT buffer.
+- read-count-return-pftgt-miss
+  This event counts the number of responses to read requests which miss the
+  PFTGT buffer.
+- read-wait
+  This event counts outstanding read requests issued by DDR memory controller
+  per cycle.
+- write-count
+  This event counts the number of write requests to MAC (including zero write,
+  full write, partial write, write cancel).
+- write-count-write
+  This event counts the number of full write requests to MAC (not including
+  zero write).
+- write-count-pwrite
+  This event counts the number of partial write requests to MAC.
+- memory-read-count
+  This event counts the number of read requests from MAC to memory.
+- memory-write-count
+  This event counts the number of full write requests from MAC to memory.
+- memory-pwrite-count
+  This event counts the number of partial write requests from MAC to memory.
+- ea-mac
+  This event counts energy consumption of MAC.
+- ea-memory
+  This event counts energy consumption of memory.
+- ea-memory-mac-write
+  This event counts the number of write requests from MAC to memory.
+- ea-ha
+  This event counts energy consumption of HA.
+
+  'ea' is the abbreviation for 'Energy Analyzer'.
+
+Examples for use with perf::
+
+  perf stat -e mac_iod0_mac0_ch0/ea-mac/ ls
+
+And, this driver supports the following events for PCI:
+- pci-port0-cycles
+  This event counts PCI cycles at PCI frequency in port0.
+- pci-port0-read-count
+  This event counts read transactions for data transfer in port0.
+- pci-port0-read-count-bus
+  This event counts read transactions for bus usage in port0.
+- pci-port0-write-count
+  This event counts write transactions for data transfer in port0.
+- pci-port0-write-count-bus
+  This event counts write transactions for bus usage in port0.
+- pci-port1-cycles
+  This event counts PCI cycles at PCI frequency in port1.
+- pci-port1-read-count
+  This event counts read transactions for data transfer in port1.
+- pci-port1-read-count-bus
+  This event counts read transactions for bus usage in port1.
+- pci-port1-write-count
+  This event counts write transactions for data transfer in port1.
+- pci-port1-write-count-bus
+  This event counts write transactions for bus usage in port1.
+- ea-pci
+  This event counts energy consumption of PCI.
+
+  'ea' is the abbreviation for 'Energy Analyzer'.
+
+Examples for use with perf::
+
+  perf stat -e pci_iod0_pci0/ea-pci/ ls
+
+Given that these are uncore PMUs the driver does not support sampling, therefore
+"perf record" will not work. Per-task perf sessions are not supported.
diff --git a/Documentation/admin-guide/perf/index.rst b/Documentation/admin-guide/perf/index.rst
index 072b510385c4..47d9a3df6329 100644
--- a/Documentation/admin-guide/perf/index.rst
+++ b/Documentation/admin-guide/perf/index.rst
@@ -29,3 +29,4 @@ Performance monitor support
    cxl
    ampere_cspmu
    mrvl-pem-pmu
+   fujitsu_uncore_pmu