Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 339 insertions, 0 deletions

diff --git a/drivers/misc/tps6594-pfsm.c b/drivers/misc/tps6594-pfsm.c
new file mode 100644
index 000000000..c3a0d6367
--- /dev/null
+++ b/drivers/misc/tps6594-pfsm.c
@@ -0,0 +1,339 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PFSM (Pre-configurable Finite State Machine) driver for the following
+ * PMICs:
+ * - LP8764
+ * - TPS65224
+ * - TPS652G1
+ * - TPS6594
+ * - TPS6593
+ *
+ * Copyright (C) 2023 BayLibre Incorporated - https://www.baylibre.com/
+ */
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/ioctl.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/tps6594.h>
+
+#include <linux/tps6594_pfsm.h>
+
+#define TPS6594_STARTUP_DEST_MCU_ONLY_VAL 2
+#define TPS6594_STARTUP_DEST_ACTIVE_VAL   3
+#define TPS6594_STARTUP_DEST_SHIFT	  5
+#define TPS6594_STARTUP_DEST_MCU_ONLY	  (TPS6594_STARTUP_DEST_MCU_ONLY_VAL \
+					   << TPS6594_STARTUP_DEST_SHIFT)
+#define TPS6594_STARTUP_DEST_ACTIVE	  (TPS6594_STARTUP_DEST_ACTIVE_VAL \
+					   << TPS6594_STARTUP_DEST_SHIFT)
+
+/*
+ * To update the PMIC firmware, the user must be able to access
+ * page 0 (user registers) and page 1 (NVM control and configuration).
+ */
+#define TPS6594_PMIC_MAX_POS 0x200
+
+#define TPS6594_FILE_TO_PFSM(f) container_of((f)->private_data, struct tps6594_pfsm, miscdev)
+
+/**
+ * struct tps6594_pfsm - device private data structure
+ *
+ * @miscdev: misc device infos
+ * @regmap:  regmap for accessing the device registers
+ * @chip_id: chip identifier of the device
+ */
+struct tps6594_pfsm {
+	struct miscdevice miscdev;
+	struct regmap *regmap;
+	unsigned long chip_id;
+};
+
+static ssize_t tps6594_pfsm_read(struct file *f, char __user *buf,
+				 size_t count, loff_t *ppos)
+{
+	struct tps6594_pfsm *pfsm = TPS6594_FILE_TO_PFSM(f);
+	loff_t pos = *ppos;
+	unsigned int val;
+	int ret;
+	int i;
+
+	if (pos < 0)
+		return -EINVAL;
+	if (pos >= TPS6594_PMIC_MAX_POS)
+		return 0;
+	if (count > TPS6594_PMIC_MAX_POS - pos)
+		count = TPS6594_PMIC_MAX_POS - pos;
+
+	for (i = 0 ; i < count ; i++) {
+		ret = regmap_read(pfsm->regmap, pos + i, &val);
+		if (ret)
+			return ret;
+
+		if (put_user(val, buf + i))
+			return -EFAULT;
+	}
+
+	*ppos = pos + count;
+
+	return count;
+}
+
+static ssize_t tps6594_pfsm_write(struct file *f, const char __user *buf,
+				  size_t count, loff_t *ppos)
+{
+	struct tps6594_pfsm *pfsm = TPS6594_FILE_TO_PFSM(f);
+	loff_t pos = *ppos;
+	char val;
+	int ret;
+	int i;
+
+	if (pos < 0)
+		return -EINVAL;
+	if (pos >= TPS6594_PMIC_MAX_POS || !count)
+		return 0;
+	if (count > TPS6594_PMIC_MAX_POS - pos)
+		count = TPS6594_PMIC_MAX_POS - pos;
+
+	for (i = 0 ; i < count ; i++) {
+		if (get_user(val, buf + i))
+			return -EFAULT;
+
+		ret = regmap_write(pfsm->regmap, pos + i, val);
+		if (ret)
+			return ret;
+	}
+
+	*ppos = pos + count;
+
+	return count;
+}
+
+static int tps6594_pfsm_configure_ret_trig(struct regmap *regmap, u8 gpio_ret, u8 ddr_ret)
+{
+	int ret;
+
+	if (gpio_ret)
+		ret = regmap_set_bits(regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
+				      TPS6594_BIT_TRIGGER_I2C(5) | TPS6594_BIT_TRIGGER_I2C(6));
+	else
+		ret = regmap_clear_bits(regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
+					TPS6594_BIT_TRIGGER_I2C(5) | TPS6594_BIT_TRIGGER_I2C(6));
+	if (ret)
+		return ret;
+
+	if (ddr_ret)
+		ret = regmap_set_bits(regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
+				      TPS6594_BIT_TRIGGER_I2C(7));
+	else
+		ret = regmap_clear_bits(regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
+					TPS6594_BIT_TRIGGER_I2C(7));
+
+	return ret;
+}
+
+static long tps6594_pfsm_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
+{
+	struct tps6594_pfsm *pfsm = TPS6594_FILE_TO_PFSM(f);
+	struct pmic_state_opt state_opt;
+	void __user *argp = (void __user *)arg;
+	unsigned int regmap_reg, mask;
+	int ret = -ENOIOCTLCMD;
+
+	switch (cmd) {
+	case PMIC_GOTO_STANDBY:
+		/* Disable LP mode on TPS6594 Family PMIC */
+		if (pfsm->chip_id != TPS65224 && pfsm->chip_id != TPS652G1) {
+			ret = regmap_clear_bits(pfsm->regmap, TPS6594_REG_RTC_CTRL_2,
+						TPS6594_BIT_LP_STANDBY_SEL);
+
+			if (ret)
+				return ret;
+		}
+
+		/* Force trigger */
+		ret = regmap_write_bits(pfsm->regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
+					TPS6594_BIT_TRIGGER_I2C(0), TPS6594_BIT_TRIGGER_I2C(0));
+		break;
+	case PMIC_GOTO_LP_STANDBY:
+		/* TPS65224/TPS652G1 does not support LP STANDBY */
+		if (pfsm->chip_id == TPS65224 || pfsm->chip_id == TPS652G1)
+			return ret;
+
+		/* Enable LP mode */
+		ret = regmap_set_bits(pfsm->regmap, TPS6594_REG_RTC_CTRL_2,
+				      TPS6594_BIT_LP_STANDBY_SEL);
+		if (ret)
+			return ret;
+
+		/* Force trigger */
+		ret = regmap_write_bits(pfsm->regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
+					TPS6594_BIT_TRIGGER_I2C(0), TPS6594_BIT_TRIGGER_I2C(0));
+		break;
+	case PMIC_UPDATE_PGM:
+		/* Force trigger */
+		ret = regmap_write_bits(pfsm->regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
+					TPS6594_BIT_TRIGGER_I2C(3), TPS6594_BIT_TRIGGER_I2C(3));
+		break;
+	case PMIC_SET_ACTIVE_STATE:
+		/* Modify NSLEEP1-2 bits */
+		ret = regmap_set_bits(pfsm->regmap, TPS6594_REG_FSM_NSLEEP_TRIGGERS,
+				      TPS6594_BIT_NSLEEP1B | TPS6594_BIT_NSLEEP2B);
+		break;
+	case PMIC_SET_MCU_ONLY_STATE:
+		/* TPS65224/TPS652G1 does not support MCU_ONLY_STATE */
+		if (pfsm->chip_id == TPS65224 || pfsm->chip_id == TPS652G1)
+			return ret;
+
+		if (copy_from_user(&state_opt, argp, sizeof(state_opt)))
+			return -EFAULT;
+
+		/* Configure retention triggers */
+		ret = tps6594_pfsm_configure_ret_trig(pfsm->regmap, state_opt.gpio_retention,
+						      state_opt.ddr_retention);
+		if (ret)
+			return ret;
+
+		/* Modify NSLEEP1-2 bits */
+		ret = regmap_clear_bits(pfsm->regmap, TPS6594_REG_FSM_NSLEEP_TRIGGERS,
+					TPS6594_BIT_NSLEEP1B);
+		if (ret)
+			return ret;
+
+		ret = regmap_set_bits(pfsm->regmap, TPS6594_REG_FSM_NSLEEP_TRIGGERS,
+				      TPS6594_BIT_NSLEEP2B);
+		break;
+	case PMIC_SET_RETENTION_STATE:
+		if (copy_from_user(&state_opt, argp, sizeof(state_opt)))
+			return -EFAULT;
+
+		/* Configure wake-up destination */
+		if (pfsm->chip_id == TPS65224 || pfsm->chip_id == TPS652G1) {
+			regmap_reg = TPS65224_REG_STARTUP_CTRL;
+			mask = TPS65224_MASK_STARTUP_DEST;
+		} else {
+			regmap_reg = TPS6594_REG_RTC_CTRL_2;
+			mask = TPS6594_MASK_STARTUP_DEST;
+		}
+
+		if (state_opt.mcu_only_startup_dest)
+			ret = regmap_write_bits(pfsm->regmap, regmap_reg,
+						mask, TPS6594_STARTUP_DEST_MCU_ONLY);
+		else
+			ret = regmap_write_bits(pfsm->regmap, regmap_reg,
+						mask, TPS6594_STARTUP_DEST_ACTIVE);
+		if (ret)
+			return ret;
+
+		/* Configure retention triggers */
+		ret = tps6594_pfsm_configure_ret_trig(pfsm->regmap, state_opt.gpio_retention,
+						      state_opt.ddr_retention);
+		if (ret)
+			return ret;
+
+		/* Modify NSLEEP1-2 bits */
+		if (pfsm->chip_id == TPS65224 || pfsm->chip_id == TPS652G1)
+			ret = regmap_clear_bits(pfsm->regmap,
+						TPS6594_REG_FSM_NSLEEP_TRIGGERS,
+						TPS6594_BIT_NSLEEP1B);
+		else
+			ret = regmap_clear_bits(pfsm->regmap,
+						TPS6594_REG_FSM_NSLEEP_TRIGGERS,
+						TPS6594_BIT_NSLEEP2B);
+		break;
+	}
+
+	return ret;
+}
+
+static const struct file_operations tps6594_pfsm_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= generic_file_llseek,
+	.read		= tps6594_pfsm_read,
+	.write		= tps6594_pfsm_write,
+	.unlocked_ioctl	= tps6594_pfsm_ioctl,
+	.compat_ioctl   = compat_ptr_ioctl,
+};
+
+static irqreturn_t tps6594_pfsm_isr(int irq, void *dev_id)
+{
+	struct platform_device *pdev = dev_id;
+	int i;
+
+	for (i = 0 ; i < pdev->num_resources ; i++) {
+		if (irq == platform_get_irq_byname(pdev, pdev->resource[i].name)) {
+			dev_err(pdev->dev.parent, "%s event detected\n", pdev->resource[i].name);
+			return IRQ_HANDLED;
+		}
+	}
+
+	return IRQ_NONE;
+}
+
+static int tps6594_pfsm_probe(struct platform_device *pdev)
+{
+	struct tps6594_pfsm *pfsm;
+	struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent);
+	struct device *dev = &pdev->dev;
+	int irq;
+	int ret;
+	int i;
+
+	pfsm = devm_kzalloc(dev, sizeof(struct tps6594_pfsm), GFP_KERNEL);
+	if (!pfsm)
+		return -ENOMEM;
+
+	pfsm->regmap = tps->regmap;
+
+	pfsm->miscdev.minor = MISC_DYNAMIC_MINOR;
+	pfsm->miscdev.name = devm_kasprintf(dev, GFP_KERNEL, "pfsm-%ld-0x%02x",
+					    tps->chip_id, tps->reg);
+	if (!pfsm->miscdev.name)
+		return -ENOMEM;
+
+	pfsm->miscdev.fops = &tps6594_pfsm_fops;
+	pfsm->miscdev.parent = dev->parent;
+	pfsm->chip_id = tps->chip_id;
+
+	for (i = 0 ; i < pdev->num_resources ; i++) {
+		irq = platform_get_irq_byname(pdev, pdev->resource[i].name);
+		if (irq < 0)
+			return irq;
+
+		ret = devm_request_threaded_irq(dev, irq, NULL,
+						tps6594_pfsm_isr, IRQF_ONESHOT,
+						pdev->resource[i].name, pdev);
+		if (ret)
+			return ret;
+	}
+
+	platform_set_drvdata(pdev, pfsm);
+
+	return misc_register(&pfsm->miscdev);
+}
+
+static void tps6594_pfsm_remove(struct platform_device *pdev)
+{
+	struct tps6594_pfsm *pfsm = platform_get_drvdata(pdev);
+
+	misc_deregister(&pfsm->miscdev);
+}
+
+static struct platform_driver tps6594_pfsm_driver = {
+	.driver	= {
+		.name = "tps6594-pfsm",
+	},
+	.probe = tps6594_pfsm_probe,
+	.remove = tps6594_pfsm_remove,
+};
+
+module_platform_driver(tps6594_pfsm_driver);
+
+MODULE_ALIAS("platform:tps6594-pfsm");
+MODULE_AUTHOR("Julien Panis <jpanis@baylibre.com>");
+MODULE_DESCRIPTION("TPS6594 Pre-configurable Finite State Machine Driver");
+MODULE_LICENSE("GPL");