sched_ext: Maintain an online cid mask in the scheduler arenagrafted

Schedulers on the default cid mapping treat [0, nr_online_cids) as the
online set and restart on hotplug. Schedulers that install their own mapping
with scx_bpf_cid_override() have no way to learn which cids are online: the
count no longer identifies members and the CPU-form cpumask is unusable from
cid programs. This is an obvious hole in the cid API.

Add scx_bpf_online_cmask(), a kernel-maintained cmask in the scheduler's
arena, allocated alongside the per-CPU scratch masks and populated after the
cid mapping is finalized and before ops.init(), for child schedulers too.
The pointer stays valid through ops.exit() with no reference to take. It is
the arena offset as a void pointer, the same form struct_ops arena arguments
arrive in. The verifier types the void return as a scalar for the program's
arena cast.

The mask follows the SCX hotplug notifications: seeded from cpu_active_mask
and updated before ops.cid_online/offline() runs, so it lags cpu_online_mask
only inside a hotplug transition. Updates walk the scheduler list under the
lock that also serializes unlinking. Reads are live, not atomic snapshots.
Root initialization excludes hotplug.

v2: Reworded the getter kerneldoc (Andrea Righi).

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>

3 files changed, 152 insertions, 0 deletions

diff --git a/lib/tests/module/.gitignore b/lib/tests/module/.gitignore
new file mode 100644
index 000000000..8be7891b2
--- /dev/null
+++ b/lib/tests/module/.gitignore
@@ -0,0 +1,4 @@
+test_kallsyms_a.c
+test_kallsyms_b.c
+test_kallsyms_c.c
+test_kallsyms_d.c
diff --git a/lib/tests/module/Makefile b/lib/tests/module/Makefile
new file mode 100644
index 000000000..2f3e1a772
--- /dev/null
+++ b/lib/tests/module/Makefile
@@ -0,0 +1,14 @@
+obj-$(CONFIG_TEST_KALLSYMS_A) += test_kallsyms_a.o
+obj-$(CONFIG_TEST_KALLSYMS_B) += test_kallsyms_b.o
+obj-$(CONFIG_TEST_KALLSYMS_C) += test_kallsyms_c.o
+obj-$(CONFIG_TEST_KALLSYMS_D) += test_kallsyms_d.o
+
+quiet_cmd_gen_test_kallsyms = GEN     $@
+	cmd_gen_test_kallsyms = $< $@ \
+	$(CONFIG_TEST_KALLSYMS_NUMSYMS) \
+	$(CONFIG_TEST_KALLSYMS_SCALE_FACTOR)
+
+$(obj)/%.c: $(src)/gen_test_kallsyms.sh FORCE
+	$(call if_changed,gen_test_kallsyms)
+
+targets += $(foreach x, a b c d, test_kallsyms_$(x).c)
diff --git a/lib/tests/module/gen_test_kallsyms.sh b/lib/tests/module/gen_test_kallsyms.sh
new file mode 100755
index 000000000..31fe4ed63
--- /dev/null
+++ b/lib/tests/module/gen_test_kallsyms.sh
@@ -0,0 +1,134 @@
+#!/usr/bin/env bash
+
+TARGET=$(basename $1)
+DIR=lib/tests/module
+TARGET="$DIR/$TARGET"
+NUM_SYMS=$2
+SCALE_FACTOR=$3
+TEST_TYPE=$(echo $TARGET | sed -e 's|lib/tests/module/test_kallsyms_||g')
+TEST_TYPE=$(echo $TEST_TYPE | sed -e 's|.c||g')
+FIRST_B_LOOKUP=1
+
+if [[ $NUM_SYMS -gt 2 ]]; then
+	FIRST_B_LOOKUP=$((NUM_SYMS/2))
+fi
+
+gen_template_module_header()
+{
+	cat <<____END_MODULE
+// SPDX-License-Identifier: GPL-2.0-or-later OR copyleft-next-0.3.1
+/*
+ * Copyright (C) 2023 Luis Chamberlain <mcgrof@kernel.org>
+ *
+ * Automatically generated code for testing, do not edit manually.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+
+____END_MODULE
+}
+
+gen_num_syms()
+{
+	PREFIX=$1
+	NUM=$2
+	for i in $(seq 1 $NUM); do
+		printf "int auto_test_%s_%010d = 0;\n" $PREFIX $i
+		printf "EXPORT_SYMBOL_GPL(auto_test_%s_%010d);\n" $PREFIX $i
+	done
+	echo
+}
+
+gen_template_module_data_a()
+{
+	gen_num_syms a $1
+	cat <<____END_MODULE
+static int auto_runtime_test(void)
+{
+	return 0;
+}
+
+____END_MODULE
+}
+
+gen_template_module_data_b()
+{
+	printf "\nextern int auto_test_a_%010d;\n\n" $FIRST_B_LOOKUP
+	echo "static int auto_runtime_test(void)"
+	echo "{"
+	printf "\nreturn auto_test_a_%010d;\n" $FIRST_B_LOOKUP
+	echo "}"
+}
+
+gen_template_module_data_c()
+{
+	gen_num_syms c $1
+	cat <<____END_MODULE
+static int auto_runtime_test(void)
+{
+	return 0;
+}
+
+____END_MODULE
+}
+
+gen_template_module_data_d()
+{
+	gen_num_syms d $1
+	cat <<____END_MODULE
+static int auto_runtime_test(void)
+{
+	return 0;
+}
+
+____END_MODULE
+}
+
+gen_template_module_exit()
+{
+	cat <<____END_MODULE
+static int __init auto_test_module_init(void)
+{
+	return auto_runtime_test();
+}
+module_init(auto_test_module_init);
+
+static void __exit auto_test_module_exit(void)
+{
+}
+module_exit(auto_test_module_exit);
+
+MODULE_AUTHOR("Luis Chamberlain <mcgrof@kernel.org>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Test module for kallsyms");
+____END_MODULE
+}
+
+case $TEST_TYPE in
+	a)
+		gen_template_module_header > $TARGET
+		gen_template_module_data_a $NUM_SYMS >> $TARGET
+		gen_template_module_exit >> $TARGET
+		;;
+	b)
+		gen_template_module_header > $TARGET
+		gen_template_module_data_b >> $TARGET
+		gen_template_module_exit >> $TARGET
+		;;
+	c)
+		gen_template_module_header > $TARGET
+		gen_template_module_data_c $((NUM_SYMS * SCALE_FACTOR)) >> $TARGET
+		gen_template_module_exit >> $TARGET
+		;;
+	d)
+		gen_template_module_header > $TARGET
+		gen_template_module_data_d $((NUM_SYMS * SCALE_FACTOR * 2)) >> $TARGET
+		gen_template_module_exit >> $TARGET
+		;;
+	*)
+		;;
+esac