perf regs: Remove __weak attributive arch__xxx_reg_mask() functions

Currently, some architecture-specific perf-regs functions, such as
arch__intr_reg_mask() and arch__user_reg_mask(), are defined with the
__weak attribute.

This approach ensures that only functions matching the architecture of
the build/run host are compiled and executed, reducing build time and
binary size.

However, this __weak attribute restricts these functions to be called
only on the same architecture, preventing cross-architecture
functionality.

For example, a perf.data file captured on x86 cannot be parsed on an ARM
platform.

To address this limitation, this patch removes the __weak attribute from
these perf-regs functions.

The architecture-specific code is moved from the arch/ directory to the
util/perf-regs-arch/ directory.

The appropriate architectural functions are then called based on the
EM_HOST.

No functional changes are intended.

Suggested-by: Ian Rogers <[email protected]>
Reviewed-by: Ian Rogers <[email protected]>
Signed-off-by: Dapeng Mi <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Alexandre Ghiti <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: John Garry <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Falcon <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Xudong Hao <[email protected]>
Cc: Zide Chen <[email protected]>
[ Fixed up somme fuzz with s390 and riscv Build files wrt removing perf_regs.o ]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: Dapeng Mi

tools/perf/arch/arm/util/Build

@@ -1,5 +1,3 @@
-perf-util-y += perf_regs.o
-
 perf-util-$(CONFIG_LOCAL_LIBUNWIND)    += unwind-libunwind.o
 
 perf-util-y += pmu.o auxtrace.o cs-etm.o

tools/perf/arch/arm/util/perf_regs.c

@@ -103,39 +103,3 @@ int arch_sdt_arg_parse_op(char *old_op, char **new_op)
 
 	return SDT_ARG_VALID;
 }
-
-uint64_t arch__intr_reg_mask(void)
-{
-	return PERF_REGS_MASK;
-}
-
-uint64_t arch__user_reg_mask(void)
-{
-	struct perf_event_attr attr = {
-		.type                   = PERF_TYPE_HARDWARE,
-		.config                 = PERF_COUNT_HW_CPU_CYCLES,
-		.sample_type            = PERF_SAMPLE_REGS_USER,
-		.disabled               = 1,
-		.exclude_kernel         = 1,
-		.sample_period		= 1,
-		.sample_regs_user	= PERF_REGS_MASK
-	};
-	int fd;
-
-	if (getauxval(AT_HWCAP) & HWCAP_SVE)
-		attr.sample_regs_user |= SMPL_REG_MASK(PERF_REG_ARM64_VG);
-
-	/*
-	 * Check if the pmu supports perf extended regs, before
-	 * returning the register mask to sample.
-	 */
-	if (attr.sample_regs_user != PERF_REGS_MASK) {
-		event_attr_init(&attr);
-		fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
-		if (fd != -1) {
-			close(fd);
-			return attr.sample_regs_user;
-		}
-	}
-	return PERF_REGS_MASK;
-}

tools/perf/arch/arm64/util/perf_regs.c

@@ -1,5 +1,4 @@
 perf-util-y += header.o
-perf-util-y += perf_regs.o
 
 perf-util-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
 perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o

tools/perf/arch/csky/Build

@@ -1,2 +1 @@
-perf-util-y += perf_regs.o
 perf-util-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o