ftrace: Synchronize the initialization of ftrace_opsgrafted

There's some internal state that ftrace_ops needs to have set, but since
it can be declared outside of the ftrace.c code, it calls
ftrace_ops_init() on the ops in every global function. The issue is that
if two tasks call it on the same ops at the same time it is possible to
have the initialization of one corrupt the initialization of the other
call.

Create a ops_mutex to use to synchronize every initialization of the
ftrace_ops. The mutex is taken within checking the ftrace_ops flag that
states it was initializied but the flag is checked again after the mutex
has been taken. Checking first outside the mutex allows it to shortcut
having to take the mutex. But then the check needs to be done again after
the mute is taken in case of races.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home
Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock")
Reported-by: sashiko-bot@kernel.org
Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 142 insertions, 0 deletions

diff --git a/drivers/ptp/ptp_clockmatrix.h b/drivers/ptp/ptp_clockmatrix.h
new file mode 100644
index 000000000..7c17c4f7f
--- /dev/null
+++ b/drivers/ptp/ptp_clockmatrix.h
@@ -0,0 +1,142 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * PTP hardware clock driver for the IDT ClockMatrix(TM) family of timing and
+ * synchronization devices.
+ *
+ * Copyright (C) 2019 Integrated Device Technology, Inc., a Renesas Company.
+ */
+#ifndef PTP_IDTCLOCKMATRIX_H
+#define PTP_IDTCLOCKMATRIX_H
+
+#include <linux/ktime.h>
+#include <linux/mfd/idt8a340_reg.h>
+#include <linux/ptp_clock.h>
+#include <linux/regmap.h>
+
+#define FW_FILENAME	"idtcm.bin"
+#define MAX_TOD		(4)
+#define MAX_PLL		(8)
+#define MAX_REF_CLK	(16)
+
+#define MAX_ABS_WRITE_PHASE_NANOSECONDS (107374182L)
+
+#define TOD_MASK_ADDR		(0xFFA5)
+#define DEFAULT_TOD_MASK	(0x04)
+
+#define SET_U16_LSB(orig, val8) (orig = (0xff00 & (orig)) | (val8))
+#define SET_U16_MSB(orig, val8) (orig = (0x00ff & (orig)) | (val8 << 8))
+
+#define TOD0_PTP_PLL_ADDR		(0xFFA8)
+#define TOD1_PTP_PLL_ADDR		(0xFFA9)
+#define TOD2_PTP_PLL_ADDR		(0xFFAA)
+#define TOD3_PTP_PLL_ADDR		(0xFFAB)
+
+#define TOD0_OUT_ALIGN_MASK_ADDR	(0xFFB0)
+#define TOD1_OUT_ALIGN_MASK_ADDR	(0xFFB2)
+#define TOD2_OUT_ALIGN_MASK_ADDR	(0xFFB4)
+#define TOD3_OUT_ALIGN_MASK_ADDR	(0xFFB6)
+
+#define DEFAULT_OUTPUT_MASK_PLL0	(0x003)
+#define DEFAULT_OUTPUT_MASK_PLL1	(0x00c)
+#define DEFAULT_OUTPUT_MASK_PLL2	(0x030)
+#define DEFAULT_OUTPUT_MASK_PLL3	(0x0c0)
+
+#define DEFAULT_TOD0_PTP_PLL		(0)
+#define DEFAULT_TOD1_PTP_PLL		(1)
+#define DEFAULT_TOD2_PTP_PLL		(2)
+#define DEFAULT_TOD3_PTP_PLL		(3)
+
+#define PHASE_PULL_IN_THRESHOLD_NS_DEPRECATED	(150000)
+#define PHASE_PULL_IN_THRESHOLD_NS		(15000)
+#define TOD_WRITE_OVERHEAD_COUNT_MAX		(2)
+#define TOD_BYTE_COUNT				(11)
+
+#define LOCK_TIMEOUT_MS			(2000)
+#define LOCK_POLL_INTERVAL_MS		(10)
+
+#define IDTCM_MAX_WRITE_COUNT		(512)
+
+#define PHASE_PULL_IN_MAX_PPB		(144000)
+#define PHASE_PULL_IN_MIN_THRESHOLD_NS	(2)
+
+/*
+ * Return register address based on passed in firmware version
+ */
+#define IDTCM_FW_REG(FW, VER, REG)	(((FW) < (VER)) ? (REG) : (REG##_##VER))
+enum fw_version {
+	V_DEFAULT = 0,
+	V487 = 1,
+	V520 = 2,
+};
+
+/* PTP PLL Mode */
+enum ptp_pll_mode {
+	PTP_PLL_MODE_MIN = 0,
+	PTP_PLL_MODE_WRITE_FREQUENCY = PTP_PLL_MODE_MIN,
+	PTP_PLL_MODE_WRITE_PHASE,
+	PTP_PLL_MODE_UNSUPPORTED,
+	PTP_PLL_MODE_MAX = PTP_PLL_MODE_UNSUPPORTED,
+};
+
+struct idtcm;
+
+struct idtcm_channel {
+	struct ptp_clock_info	caps;
+	struct ptp_clock	*ptp_clock;
+	struct idtcm		*idtcm;
+	u16			dpll_phase;
+	u16			dpll_freq;
+	u16			dpll_n;
+	u16			dpll_ctrl_n;
+	u16			dpll_phase_pull_in;
+	u16			tod_read_primary;
+	u16			tod_read_secondary;
+	u16			tod_write;
+	u16			tod_n;
+	u16			hw_dpll_n;
+	u8			sync_src;
+	enum ptp_pll_mode	mode;
+	int			(*configure_write_frequency)(struct idtcm_channel *channel);
+	int			(*configure_write_phase)(struct idtcm_channel *channel);
+	int			(*do_phase_pull_in)(struct idtcm_channel *channel,
+						    s32 offset_ns, u32 max_ffo_ppb);
+	s32			current_freq_scaled_ppm;
+	bool			phase_pull_in;
+	u32			dco_delay;
+	/* last input trigger for extts */
+	u8			refn;
+	u8			pll;
+	u8			tod;
+	u16			output_mask;
+};
+
+struct idtcm {
+	struct idtcm_channel	channel[MAX_TOD];
+	struct device		*dev;
+	u8			tod_mask;
+	char			version[16];
+	enum fw_version		fw_ver;
+	/* Polls for external time stamps */
+	u8			extts_mask;
+	bool			extts_single_shot;
+	struct delayed_work	extts_work;
+	/* Remember the ptp channel to report extts */
+	struct idtcm_channel	*event_channel[MAX_TOD];
+	/* Mutex to protect operations from being interrupted */
+	struct mutex		*lock;
+	struct device		*mfd;
+	struct regmap		*regmap;
+	/* Overhead calculation for adjtime */
+	u8			calculate_overhead_flag;
+	s64			tod_write_overhead_ns;
+	ktime_t			start_time;
+};
+
+struct idtcm_fwrc {
+	u8 hiaddr;
+	u8 loaddr;
+	u8 value;
+	u8 reserved;
+} __packed;
+
+#endif /* PTP_IDTCLOCKMATRIX_H */