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, 194 insertions, 0 deletions

diff --git a/drivers/pinctrl/qcom/pinctrl-msm.h b/drivers/pinctrl/qcom/pinctrl-msm.h
new file mode 100644
index 000000000..b94ba1a41
--- /dev/null
+++ b/drivers/pinctrl/qcom/pinctrl-msm.h
@@ -0,0 +1,194 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2013, Sony Mobile Communications AB.
+ */
+#ifndef __PINCTRL_MSM_H__
+#define __PINCTRL_MSM_H__
+
+#include <linux/pm.h>
+#include <linux/types.h>
+
+#include <linux/pinctrl/pinctrl.h>
+
+struct platform_device;
+
+struct pinctrl_pin_desc;
+
+#define APQ_PIN_FUNCTION(fname)					\
+	[APQ_MUX_##fname] = PINCTRL_PINFUNCTION(#fname,		\
+					fname##_groups,		\
+					ARRAY_SIZE(fname##_groups))
+
+#define IPQ_PIN_FUNCTION(fname)					\
+	[IPQ_MUX_##fname] = PINCTRL_PINFUNCTION(#fname,		\
+					fname##_groups,		\
+					ARRAY_SIZE(fname##_groups))
+
+#define IPQ_GPIO_PIN_FUNCTION(fname)					\
+	[IPQ_MUX_##fname] = PINCTRL_GPIO_PINFUNCTION(#fname,		\
+					fname##_groups,		\
+					ARRAY_SIZE(fname##_groups))
+
+#define MSM_PIN_FUNCTION(fname) 				\
+	[msm_mux_##fname] = PINCTRL_PINFUNCTION(#fname,		\
+					fname##_groups,		\
+					ARRAY_SIZE(fname##_groups))
+
+#define MSM_GPIO_PIN_FUNCTION(fname)				\
+	[msm_mux_##fname] = PINCTRL_GPIO_PINFUNCTION(#fname,	\
+					fname##_groups,		\
+					ARRAY_SIZE(fname##_groups))
+
+#define QCA_PIN_FUNCTION(fname)					\
+	[qca_mux_##fname] = PINCTRL_PINFUNCTION(#fname,		\
+					fname##_groups,		\
+					ARRAY_SIZE(fname##_groups))
+
+#define QCA_GPIO_PIN_FUNCTION(fname)				\
+	[qca_mux_##fname] = PINCTRL_GPIO_PINFUNCTION(#fname,	\
+					fname##_groups,		\
+					ARRAY_SIZE(fname##_groups))
+
+/**
+ * struct msm_pingroup - Qualcomm pingroup definition
+ * @grp:                  Generic data of the pin group (name and pins)
+ * @funcs:                A list of pinmux functions that can be selected for
+ *                        this group. The index of the selected function is used
+ *                        for programming the function selector.
+ *                        Entries should be indices into the groups list of the
+ *                        struct msm_pinctrl_soc_data.
+ * @ctl_reg:              Offset of the register holding control bits for this group.
+ * @io_reg:               Offset of the register holding input/output bits for this group.
+ * @intr_cfg_reg:         Offset of the register holding interrupt configuration bits.
+ * @intr_status_reg:      Offset of the register holding the status bits for this group.
+ * @intr_target_reg:      Offset of the register specifying routing of the interrupts
+ *                        from this group. On most SoCs this register is the same as
+ *                        @intr_cfg_reg; leaving this field as zero causes the driver
+ *                        to fall back to @intr_cfg_reg automatically. Only set this
+ *                        explicitly on older SoCs where the interrupt target routing
+ *                        lives in a separate register (e.g. APQ8064, MSM8960).
+ * @mux_bit:              Offset in @ctl_reg for the pinmux function selection.
+ * @pull_bit:             Offset in @ctl_reg for the bias configuration.
+ * @drv_bit:              Offset in @ctl_reg for the drive strength configuration.
+ * @od_bit:               Offset in @ctl_reg for controlling open drain.
+ * @oe_bit:               Offset in @ctl_reg for controlling output enable.
+ * @in_bit:               Offset in @io_reg for the input bit value.
+ * @out_bit:              Offset in @io_reg for the output bit value.
+ * @intr_enable_bit:      Offset in @intr_cfg_reg for enabling the interrupt for this group.
+ * @intr_status_bit:      Offset in @intr_status_reg for reading and acking the interrupt
+ *                        status.
+ * @intr_wakeup_present_bit: Offset in @intr_target_reg specifying the GPIO can generate
+ *			  wakeup events.
+ * @intr_wakeup_enable_bit: Offset in @intr_target_reg to enable wakeup events for the GPIO.
+ * @intr_target_bit:      Offset in @intr_target_reg for configuring the interrupt routing.
+ * @intr_target_width:    Number of bits used for specifying interrupt routing target.
+ * @intr_target_kpss_val: Value in @intr_target_bit for specifying that the interrupt from
+ *                        this gpio should get routed to the KPSS processor.
+ * @intr_raw_status_bit:  Offset in @intr_cfg_reg for the raw status bit.
+ * @intr_polarity_bit:    Offset in @intr_cfg_reg for specifying polarity of the interrupt.
+ * @intr_detection_bit:   Offset in @intr_cfg_reg for specifying interrupt type.
+ * @intr_detection_width: Number of bits used for specifying interrupt type,
+ *                        Should be 2 for SoCs that can detect both edges in hardware,
+ *                        otherwise 1.
+ */
+struct msm_pingroup {
+	struct pingroup grp;
+
+	unsigned *funcs;
+	unsigned nfuncs;
+
+	u32 ctl_reg;
+	u32 io_reg;
+	u32 intr_cfg_reg;
+	u32 intr_status_reg;
+	u32 intr_target_reg;
+
+	unsigned int tile:2;
+
+	unsigned mux_bit:5;
+
+	unsigned pull_bit:5;
+	unsigned drv_bit:5;
+	unsigned i2c_pull_bit:5;
+
+	unsigned od_bit:5;
+	unsigned egpio_enable:5;
+	unsigned egpio_present:5;
+	unsigned oe_bit:5;
+	unsigned in_bit:5;
+	unsigned out_bit:5;
+
+	unsigned intr_enable_bit:5;
+	unsigned intr_status_bit:5;
+	unsigned intr_ack_high:1;
+
+	unsigned intr_wakeup_present_bit:5;
+	unsigned intr_wakeup_enable_bit:5;
+	unsigned intr_target_bit:5;
+	unsigned intr_target_width:5;
+	unsigned intr_target_kpss_val:5;
+	unsigned intr_raw_status_bit:5;
+	unsigned intr_polarity_bit:5;
+	unsigned intr_detection_bit:5;
+	unsigned intr_detection_width:5;
+};
+
+/**
+ * struct msm_gpio_wakeirq_map - Map of GPIOs and their wakeup pins
+ * @gpio:          The GPIOs that are wakeup capable
+ * @wakeirq:       The interrupt at the always-on interrupt controller
+ */
+struct msm_gpio_wakeirq_map {
+	unsigned int gpio;
+	unsigned int wakeirq;
+};
+
+/**
+ * struct msm_pinctrl_soc_data - Qualcomm pin controller driver configuration
+ * @pins:	    An array describing all pins the pin controller affects.
+ * @npins:	    The number of entries in @pins.
+ * @functions:	    An array describing all mux functions the SoC supports.
+ * @nfunctions:	    The number of entries in @functions.
+ * @groups:	    An array describing all pin groups the pin SoC supports.
+ * @ngroups:	    The numbmer of entries in @groups.
+ * @ngpio:	    The number of pingroups the driver should expose as GPIOs.
+ * @pull_no_keeper: The SoC does not support keeper bias.
+ * @wakeirq_map:    The map of wakeup capable GPIOs and the pin at PDC/MPM
+ * @nwakeirq_map:   The number of entries in @wakeirq_map
+ * @wakeirq_dual_edge_errata: If true then GPIOs using the wakeirq_map need
+ *                            to be aware that their parent can't handle dual
+ *                            edge interrupts.
+ * @gpio_func: Which function number is GPIO (usually 0).
+ * @egpio_func: If non-zero then this SoC supports eGPIO. Even though in
+ *              hardware this is a mux 1-level above the TLMM, we'll treat
+ *              it as if this is just another mux state of the TLMM. Since
+ *              it doesn't really map to hardware, we'll allocate a virtual
+ *              function number for eGPIO and any time we see that function
+ *              number used we'll treat it as a request to mux away from
+ *              our TLMM towards another owner.
+ */
+struct msm_pinctrl_soc_data {
+	const struct pinctrl_pin_desc *pins;
+	unsigned npins;
+	const struct pinfunction *functions;
+	unsigned nfunctions;
+	const struct msm_pingroup *groups;
+	unsigned ngroups;
+	unsigned ngpios;
+	bool pull_no_keeper;
+	const char *const *tiles;
+	unsigned int ntiles;
+	const int *reserved_gpios;
+	const struct msm_gpio_wakeirq_map *wakeirq_map;
+	unsigned int nwakeirq_map;
+	bool wakeirq_dual_edge_errata;
+	unsigned int gpio_func;
+	unsigned int egpio_func;
+};
+
+extern const struct dev_pm_ops msm_pinctrl_dev_pm_ops;
+
+int msm_pinctrl_probe(struct platform_device *pdev,
+		      const struct msm_pinctrl_soc_data *soc_data);
+
+#endif