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, 451 insertions, 0 deletions

diff --git a/include/acpi/processor.h b/include/acpi/processor.h
new file mode 100644
index 000000000..554be224c
--- /dev/null
+++ b/include/acpi/processor.h
@@ -0,0 +1,451 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ACPI_PROCESSOR_H
+#define __ACPI_PROCESSOR_H
+
+#include <linux/cpu.h>
+#include <linux/cpufreq.h>
+#include <linux/pm_qos.h>
+#include <linux/printk.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/thermal.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include <asm/acpi.h>
+
+#define ACPI_PROCESSOR_DEVICE_HID	"ACPI0007"
+#define ACPI_PROCESSOR_CONTAINER_HID	"ACPI0010"
+
+#define ACPI_PROCESSOR_BUSY_METRIC	10
+
+#define ACPI_PROCESSOR_MAX_POWER	8
+#define ACPI_PROCESSOR_MAX_C2_LATENCY	100
+#define ACPI_PROCESSOR_MAX_C3_LATENCY	1000
+
+#define ACPI_PROCESSOR_MAX_THROTTLING	16
+#define ACPI_PROCESSOR_MAX_THROTTLE	250	/* 25% */
+#define ACPI_PROCESSOR_MAX_DUTY_WIDTH	4
+
+#define ACPI_PDC_REVISION_ID		0x1
+
+#define ACPI_PSD_REV0_REVISION		0	/* Support for _PSD as in ACPI 3.0 */
+#define ACPI_PSD_REV0_ENTRIES		5
+
+#define ACPI_TSD_REV0_REVISION		0	/* Support for _PSD as in ACPI 3.0 */
+#define ACPI_TSD_REV0_ENTRIES		5
+/*
+ * Types of coordination defined in ACPI 3.0. Same macros can be used across
+ * P, C and T states
+ */
+#define DOMAIN_COORD_TYPE_SW_ALL	0xfc
+#define DOMAIN_COORD_TYPE_SW_ANY	0xfd
+#define DOMAIN_COORD_TYPE_HW_ALL	0xfe
+
+#define ACPI_CSTATE_SYSTEMIO	0
+#define ACPI_CSTATE_FFH		1
+#define ACPI_CSTATE_HALT	2
+#define ACPI_CSTATE_INTEGER	3
+
+#define ACPI_CX_DESC_LEN	32
+
+/* Power Management */
+
+struct acpi_processor_cx;
+
+struct acpi_power_register {
+	u8 descriptor;
+	u16 length;
+	u8 space_id;
+	u8 bit_width;
+	u8 bit_offset;
+	u8 access_size;
+	u64 address;
+} __packed;
+
+struct acpi_processor_cx {
+	u8 valid;
+	u8 type;
+	u32 address;
+	u8 entry_method;
+	u8 index;
+	u32 latency;
+	u8 bm_sts_skip;
+	char desc[ACPI_CX_DESC_LEN];
+};
+
+struct acpi_lpi_state {
+	u32 min_residency;
+	u32 wake_latency; /* worst case */
+	u32 flags;
+	u32 arch_flags;
+	u32 res_cnt_freq;
+	u32 enable_parent_state;
+	u64 address;
+	u8 index;
+	u8 entry_method;
+	char desc[ACPI_CX_DESC_LEN];
+};
+
+struct acpi_processor_power {
+	int count;
+	union {
+		struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];
+		struct acpi_lpi_state lpi_states[ACPI_PROCESSOR_MAX_POWER];
+	};
+	int timer_broadcast_on_state;
+};
+
+/* Performance Management */
+
+struct acpi_psd_package {
+	u64 num_entries;
+	u64 revision;
+	u64 domain;
+	u64 coord_type;
+	u64 num_processors;
+} __packed;
+
+struct acpi_pct_register {
+	u8 descriptor;
+	u16 length;
+	u8 space_id;
+	u8 bit_width;
+	u8 bit_offset;
+	u8 reserved;
+	u64 address;
+} __packed;
+
+struct acpi_processor_px {
+	u64 core_frequency;	/* megahertz */
+	u64 power;	/* milliWatts */
+	u64 transition_latency;	/* microseconds */
+	u64 bus_master_latency;	/* microseconds */
+	u64 control;	/* control value */
+	u64 status;	/* success indicator */
+};
+
+struct acpi_processor_performance {
+	unsigned int state;
+	unsigned int platform_limit;
+	struct acpi_pct_register control_register;
+	struct acpi_pct_register status_register;
+	unsigned int state_count;
+	struct acpi_processor_px *states;
+	struct acpi_psd_package domain_info;
+	cpumask_var_t shared_cpu_map;
+	unsigned int shared_type;
+};
+
+/* Throttling Control */
+
+struct acpi_tsd_package {
+	u64 num_entries;
+	u64 revision;
+	u64 domain;
+	u64 coord_type;
+	u64 num_processors;
+} __packed;
+
+struct acpi_ptc_register {
+	u8 descriptor;
+	u16 length;
+	u8 space_id;
+	u8 bit_width;
+	u8 bit_offset;
+	u8 reserved;
+	u64 address;
+} __packed;
+
+struct acpi_processor_tx_tss {
+	u64 freqpercentage;	/* */
+	u64 power;	/* milliWatts */
+	u64 transition_latency;	/* microseconds */
+	u64 control;	/* control value */
+	u64 status;	/* success indicator */
+};
+struct acpi_processor_tx {
+	u16 power;
+	u16 performance;
+};
+
+struct acpi_processor;
+struct acpi_processor_throttling {
+	unsigned int state;
+	unsigned int platform_limit;
+	struct acpi_pct_register control_register;
+	struct acpi_pct_register status_register;
+	unsigned int state_count;
+	struct acpi_processor_tx_tss *states_tss;
+	struct acpi_tsd_package domain_info;
+	cpumask_var_t shared_cpu_map;
+	int (*acpi_processor_get_throttling) (struct acpi_processor * pr);
+	int (*acpi_processor_set_throttling) (struct acpi_processor * pr,
+					      int state, bool force);
+
+	u32 address;
+	u8 duty_offset;
+	u8 duty_width;
+	u8 tsd_valid_flag;
+	unsigned int shared_type;
+	struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
+};
+
+/* Limit Interface */
+
+struct acpi_processor_lx {
+	int px;			/* performance state */
+	int tx;			/* throttle level */
+};
+
+struct acpi_processor_limit {
+	struct acpi_processor_lx state;	/* current limit */
+	struct acpi_processor_lx thermal;	/* thermal limit */
+	struct acpi_processor_lx user;	/* user limit */
+};
+
+struct acpi_processor_flags {
+	u8 power:1;
+	u8 performance:1;
+	u8 throttling:1;
+	u8 limit:1;
+	u8 bm_control:1;
+	u8 bm_check:1;
+	u8 has_cst:1;
+	u8 has_lpi:1;
+	u8 power_setup_done:1;
+	u8 bm_rld_set:1;
+	u8 previously_online:1;
+};
+
+struct acpi_processor {
+	acpi_handle handle;
+	u32 acpi_id;
+	phys_cpuid_t phys_id;	/* CPU hardware ID such as APIC ID for x86 */
+	u32 id;		/* CPU logical ID allocated by OS */
+	u32 pblk;
+	int performance_platform_limit;
+	int throttling_platform_limit;
+	/* 0 - states 0..n-th state available */
+
+	struct acpi_processor_flags flags;
+	struct acpi_processor_power power;
+	struct acpi_processor_performance *performance;
+	struct acpi_processor_throttling throttling;
+	struct acpi_processor_limit limit;
+	struct thermal_cooling_device *cdev;
+	struct device *dev; /* Processor device. */
+	struct freq_qos_request perflib_req;
+	struct freq_qos_request thermal_req;
+};
+
+struct acpi_processor_errata {
+	u8 smp;
+	struct {
+		u8 throttle:1;
+		u8 fdma:1;
+		u8 reserved:6;
+		u32 bmisx;
+	} piix4;
+};
+
+extern int acpi_processor_preregister_performance(struct
+						  acpi_processor_performance
+						  __percpu *performance);
+
+extern int acpi_processor_register_performance(struct acpi_processor_performance
+					       *performance, unsigned int cpu);
+extern void acpi_processor_unregister_performance(unsigned int cpu);
+
+int acpi_processor_pstate_control(void);
+/* note: this locks both the calling module and the processor module
+         if a _PPC object exists, rmmod is disallowed then */
+int acpi_processor_notify_smm(struct module *calling_module);
+int acpi_processor_get_psd(acpi_handle handle,
+			   struct acpi_psd_package *pdomain);
+
+/* parsing the _P* objects. */
+extern int acpi_processor_get_performance_info(struct acpi_processor *pr);
+
+/* for communication between multiple parts of the processor kernel module */
+DECLARE_PER_CPU(struct acpi_processor *, processors);
+extern struct acpi_processor_errata errata;
+
+#if defined(ARCH_HAS_POWER_INIT) && defined(CONFIG_ACPI_PROCESSOR_CSTATE)
+void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
+					unsigned int cpu);
+int acpi_processor_ffh_cstate_probe(unsigned int cpu,
+				    struct acpi_processor_cx *cx,
+				    struct acpi_power_register *reg);
+void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx *cstate);
+void __noreturn acpi_processor_ffh_play_dead(struct acpi_processor_cx *cx);
+#else
+static inline void acpi_processor_power_init_bm_check(struct
+						      acpi_processor_flags
+						      *flags, unsigned int cpu)
+{
+	flags->bm_check = 1;
+	return;
+}
+static inline int acpi_processor_ffh_cstate_probe(unsigned int cpu,
+						  struct acpi_processor_cx *cx,
+						  struct acpi_power_register
+						  *reg)
+{
+	return -1;
+}
+static inline void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx
+						   *cstate)
+{
+	return;
+}
+static inline void __noreturn acpi_processor_ffh_play_dead(struct acpi_processor_cx *cx)
+{
+	BUG();
+}
+#endif
+
+static inline int call_on_cpu(int cpu, long (*fn)(void *), void *arg,
+			      bool direct)
+{
+	if (direct || (is_percpu_thread() && cpu == smp_processor_id()))
+		return fn(arg);
+	return work_on_cpu(cpu, fn, arg);
+}
+
+/* in processor_perflib.c */
+
+#ifdef CONFIG_CPU_FREQ
+extern bool acpi_processor_cpufreq_init;
+void acpi_processor_ignore_ppc_init(void);
+void acpi_processor_ppc_init(struct cpufreq_policy *policy);
+void acpi_processor_ppc_exit(struct cpufreq_policy *policy);
+void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag);
+extern int acpi_processor_get_bios_limit(int cpu, unsigned int *limit);
+#else
+static inline void acpi_processor_ignore_ppc_init(void)
+{
+	return;
+}
+static inline void acpi_processor_ppc_init(struct cpufreq_policy *policy)
+{
+	return;
+}
+static inline void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
+{
+	return;
+}
+static inline void acpi_processor_ppc_has_changed(struct acpi_processor *pr,
+								int event_flag)
+{
+	static unsigned int printout = 1;
+	if (printout) {
+		printk(KERN_WARNING
+		       "Warning: Processor Platform Limit event detected, but not handled.\n");
+		printk(KERN_WARNING
+		       "Consider compiling CPUfreq support into your kernel.\n");
+		printout = 0;
+	}
+}
+static inline int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
+{
+	return -ENODEV;
+}
+
+#endif				/* CONFIG_CPU_FREQ */
+
+/* in processor_core.c */
+phys_cpuid_t acpi_get_phys_id(acpi_handle, int type, u32 acpi_id);
+phys_cpuid_t acpi_map_madt_entry(u32 acpi_id);
+int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id);
+int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
+
+#ifdef CONFIG_ACPI_CPPC_LIB
+extern int acpi_cppc_processor_probe(struct acpi_processor *pr);
+extern void acpi_cppc_processor_exit(struct acpi_processor *pr);
+#else
+static inline int acpi_cppc_processor_probe(struct acpi_processor *pr)
+{
+	return 0;
+}
+static inline void acpi_cppc_processor_exit(struct acpi_processor *pr)
+{
+	return;
+}
+#endif	/* CONFIG_ACPI_CPPC_LIB */
+
+/* in processor_pdc.c */
+void acpi_processor_set_pdc(acpi_handle handle);
+
+/* in processor_throttling.c */
+#ifdef CONFIG_ACPI_CPU_FREQ_PSS
+int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
+int acpi_processor_get_throttling_info(struct acpi_processor *pr);
+extern int acpi_processor_set_throttling(struct acpi_processor *pr,
+					 int state, bool force);
+/*
+ * Reevaluate whether the T-state is invalid after one cpu is
+ * onlined/offlined. In such case the flags.throttling will be updated.
+ */
+extern void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
+			bool is_dead);
+extern const struct file_operations acpi_processor_throttling_fops;
+extern void acpi_processor_throttling_init(void);
+#else
+static inline int acpi_processor_tstate_has_changed(struct acpi_processor *pr)
+{
+	return 0;
+}
+
+static inline int acpi_processor_get_throttling_info(struct acpi_processor *pr)
+{
+	return -ENODEV;
+}
+
+static inline int acpi_processor_set_throttling(struct acpi_processor *pr,
+					 int state, bool force)
+{
+	return -ENODEV;
+}
+
+static inline void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
+			bool is_dead) {}
+
+static inline void acpi_processor_throttling_init(void) {}
+#endif	/* CONFIG_ACPI_CPU_FREQ_PSS */
+
+/* in processor_idle.c */
+#ifdef CONFIG_ACPI_PROCESSOR_IDLE
+void acpi_processor_power_init(struct acpi_processor *pr);
+void acpi_processor_power_exit(struct acpi_processor *pr);
+int acpi_processor_power_state_has_changed(struct acpi_processor *pr);
+int acpi_processor_hotplug(struct acpi_processor *pr);
+void acpi_processor_register_idle_driver(void);
+void acpi_processor_unregister_idle_driver(void);
+int acpi_processor_ffh_lpi_probe(unsigned int cpu);
+int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi);
+#endif /* CONFIG_ACPI_PROCESSOR_IDLE */
+
+/* in processor_thermal.c */
+int acpi_processor_thermal_init(struct acpi_processor *pr,
+				struct acpi_device *device);
+void acpi_processor_thermal_exit(struct acpi_processor *pr,
+				 struct acpi_device *device);
+extern const struct thermal_cooling_device_ops processor_cooling_ops;
+#ifdef CONFIG_CPU_FREQ
+void acpi_thermal_cpufreq_init(struct cpufreq_policy *policy);
+void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy);
+#else
+static inline void acpi_thermal_cpufreq_init(struct cpufreq_policy *policy)
+{
+	return;
+}
+static inline void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy)
+{
+	return;
+}
+#endif	/* CONFIG_CPU_FREQ */
+
+void acpi_processor_init_invariance_cppc(void);
+
+#endif