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, 60 insertions, 0 deletions

diff --git a/drivers/usb/dwc3/io.h b/drivers/usb/dwc3/io.h
new file mode 100644
index 000000000..cad9a2ae1
--- /dev/null
+++ b/drivers/usb/dwc3/io.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * io.h - DesignWare USB3 DRD IO Header
+ *
+ * Copyright (C) 2010-2011 Texas Instruments Incorporated - https://www.ti.com
+ *
+ * Authors: Felipe Balbi <balbi@ti.com>,
+ *	    Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+ */
+
+#ifndef __DRIVERS_USB_DWC3_IO_H
+#define __DRIVERS_USB_DWC3_IO_H
+
+#include <linux/io.h>
+#include "trace.h"
+#include "debug.h"
+#include "core.h"
+
+static inline u32 dwc3_readl(struct dwc3 *dwc, u32 offset)
+{
+	u32 value;
+	void __iomem *base = dwc->regs;
+
+	/*
+	 * We requested the mem region starting from the Globals address
+	 * space, see dwc3_probe in core.c.
+	 * However, the offsets are given starting from xHCI address space.
+	 */
+	value = readl(base + offset - DWC3_GLOBALS_REGS_START);
+
+	/*
+	 * When tracing we want to make it easy to find the correct address on
+	 * documentation, so we revert it back to the proper addresses, the
+	 * same way they are described on SNPS documentation
+	 */
+	trace_dwc3_readl(dwc, base - DWC3_GLOBALS_REGS_START, offset, value);
+
+	return value;
+}
+
+static inline void dwc3_writel(struct dwc3 *dwc, u32 offset, u32 value)
+{
+	void __iomem *base = dwc->regs;
+
+	/*
+	 * We requested the mem region starting from the Globals address
+	 * space, see dwc3_probe in core.c.
+	 * However, the offsets are given starting from xHCI address space.
+	 */
+	writel(value, base + offset - DWC3_GLOBALS_REGS_START);
+
+	/*
+	 * When tracing we want to make it easy to find the correct address on
+	 * documentation, so we revert it back to the proper addresses, the
+	 * same way they are described on SNPS documentation
+	 */
+	trace_dwc3_writel(dwc, base - DWC3_GLOBALS_REGS_START, offset, value);
+}
+
+#endif /* __DRIVERS_USB_DWC3_IO_H */