selftests/bpf: Add a test for objects stuck in free_by_rcu_ttracegrafted

Delete all elements of BPF_F_NO_PREALLOC hash map in one batch. The first
free_bulk() starts RCU tasks trace GP and the rest of the elements are
freed while it's in flight. Wait for call_rcu_ttrace_in_progress to clear
in bpf_mem_cache of every cpu and check that free_by_rcu_ttrace and
waiting_for_gp_ttrace lists are empty.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20260930095920.601738-4-alexei.starovoitov@gmail.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/drivers/soundwire/irq.c b/drivers/soundwire/irq.c
new file mode 100644
index 000000000..f18be37ef
--- /dev/null
+++ b/drivers/soundwire/irq.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2023 Cirrus Logic, Inc. and
+//                    Cirrus Logic International Semiconductor Ltd.
+
+#include <linux/device.h>
+#include <linux/fwnode.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/soundwire/sdw.h>
+#include "irq.h"
+
+static int sdw_irq_map(struct irq_domain *h, unsigned int virq,
+		       irq_hw_number_t hw)
+{
+	struct sdw_bus *bus = h->host_data;
+
+	irq_set_chip_data(virq, bus);
+	irq_set_chip(virq, &bus->irq_chip);
+	irq_set_nested_thread(virq, 1);
+	irq_set_noprobe(virq);
+
+	return 0;
+}
+
+static const struct irq_domain_ops sdw_domain_ops = {
+	.map	= sdw_irq_map,
+};
+
+int sdw_irq_create(struct sdw_bus *bus,
+		   struct fwnode_handle *fwnode)
+{
+	bus->irq_chip.name = dev_name(bus->dev);
+
+	bus->domain = irq_domain_create_linear(fwnode, SDW_FW_MAX_DEVICES,
+					       &sdw_domain_ops, bus);
+	if (!bus->domain) {
+		dev_err(bus->dev, "Failed to add IRQ domain\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+void sdw_irq_delete(struct sdw_bus *bus)
+{
+	irq_domain_remove(bus->domain);
+}
+
+static void sdw_irq_dispose_mapping(void *data)
+{
+	struct sdw_slave *slave = data;
+
+	irq_dispose_mapping(slave->irq);
+}
+
+void sdw_irq_create_mapping(struct sdw_slave *slave)
+{
+	slave->irq = irq_create_mapping(slave->bus->domain, slave->index);
+	if (!slave->irq)
+		dev_warn(&slave->dev, "Failed to map IRQ\n");
+
+	devm_add_action_or_reset(&slave->dev, sdw_irq_dispose_mapping, slave);
+}