BACKPORT: perf: Add Arm CMN-600 PMU driver

Replaced the current version with upstreamed version. Initial driver for PMU event counting on the Arm CMN-600 interconnect. CMN sports an obnoxiously complex distributed PMU system as part of its debug and trace features, which can do all manner of things like sampling, cross-triggering and generating CoreSight trace. This driver covers the PMU functionality, plus the relevant aspects of watchpoints for simply counting matching flits. Tested-by: Tsahi Zidenberg <[email protected]> Tested-by: Tuan Phan <[email protected]> Signed-off-by: Robin Murphy <[email protected]> Signed-off-by: Will Deacon <[email protected]> Backported from: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/perf/arm-cmn.c?id=0ba64770a2f2e5a104bf835e133d78d3f82287ad Signed-off-by: Tuan Phan <[email protected]>
AmpereComputing · Jan 4, 2021 · 4ccd6fc · 4ccd6fc
1 parent d6f5dfc
commit 4ccd6fc
Show file tree

Hide file tree

Showing 2 changed files with 799 additions and 564 deletions.
diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig
@@ -42,7 +42,7 @@ config ARM_CCN
 
 config ARM_CMN
 	tristate "Arm CMN-600 PMU support"
-	depends on ARM || ARM64
+	depends on ARM64 || (COMPILE_TEST && 64BIT)
 	help
 	  Support for PMU events monitoring on the Arm CMN-600 Coherent Mesh
 	  Network interconnect.