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[PATCH 17/18] drivers: Remove CONFIG_OPROFILE support
|
From: Viresh K. <vir...@li...> - 2021-01-14 12:00:57
|
The "oprofile" user-space tools don't use the kernel OPROFILE support
any more, and haven't in a long time. User-space has been converted to
the perf interfaces.
Remove kernel's old oprofile support.
Suggested-by: Christoph Hellwig <hc...@in...>
Suggested-by: Linus Torvalds <tor...@li...>
Signed-off-by: Viresh Kumar <vir...@li...>
---
Documentation/RCU/NMI-RCU.rst | 3 +-
.../admin-guide/kernel-parameters.txt | 14 -
Documentation/process/magic-number.rst | 1 -
.../it_IT/process/magic-number.rst | 1 -
.../zh_CN/process/magic-number.rst | 1 -
MAINTAINERS | 11 -
arch/Kconfig | 32 -
drivers/oprofile/buffer_sync.c | 591 ------------------
drivers/oprofile/buffer_sync.h | 22 -
drivers/oprofile/cpu_buffer.c | 465 --------------
drivers/oprofile/cpu_buffer.h | 121 ----
drivers/oprofile/event_buffer.c | 209 -------
drivers/oprofile/event_buffer.h | 40 --
drivers/oprofile/nmi_timer_int.c | 157 -----
drivers/oprofile/oprof.c | 286 ---------
drivers/oprofile/oprof.h | 50 --
drivers/oprofile/oprofile_files.c | 201 ------
drivers/oprofile/oprofile_perf.c | 328 ----------
drivers/oprofile/oprofile_stats.c | 84 ---
drivers/oprofile/oprofile_stats.h | 33 -
drivers/oprofile/oprofilefs.c | 300 ---------
drivers/oprofile/timer_int.c | 122 ----
include/linux/oprofile.h | 209 -------
init/Kconfig | 2 +-
24 files changed, 2 insertions(+), 3281 deletions(-)
delete mode 100644 drivers/oprofile/buffer_sync.c
delete mode 100644 drivers/oprofile/buffer_sync.h
delete mode 100644 drivers/oprofile/cpu_buffer.c
delete mode 100644 drivers/oprofile/cpu_buffer.h
delete mode 100644 drivers/oprofile/event_buffer.c
delete mode 100644 drivers/oprofile/event_buffer.h
delete mode 100644 drivers/oprofile/nmi_timer_int.c
delete mode 100644 drivers/oprofile/oprof.c
delete mode 100644 drivers/oprofile/oprof.h
delete mode 100644 drivers/oprofile/oprofile_files.c
delete mode 100644 drivers/oprofile/oprofile_perf.c
delete mode 100644 drivers/oprofile/oprofile_stats.c
delete mode 100644 drivers/oprofile/oprofile_stats.h
delete mode 100644 drivers/oprofile/oprofilefs.c
delete mode 100644 drivers/oprofile/timer_int.c
delete mode 100644 include/linux/oprofile.h
diff --git a/Documentation/RCU/NMI-RCU.rst b/Documentation/RCU/NMI-RCU.rst
index 180958388ff9..2a92bc685ef1 100644
--- a/Documentation/RCU/NMI-RCU.rst
+++ b/Documentation/RCU/NMI-RCU.rst
@@ -8,8 +8,7 @@ Although RCU is usually used to protect read-mostly data structures,
it is possible to use RCU to provide dynamic non-maskable interrupt
handlers, as well as dynamic irq handlers. This document describes
how to do this, drawing loosely from Zwane Mwaikambo's NMI-timer
-work in "arch/x86/oprofile/nmi_timer_int.c" and in
-"arch/x86/kernel/traps.c".
+work in "arch/x86/kernel/traps.c".
The relevant pieces of code are listed below, each followed by a
brief explanation::
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 9e3cdb271d06..e860c681766b 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3458,20 +3458,6 @@
For example, to override I2C bus2:
omap_mux=i2c2_scl.i2c2_scl=0x100,i2c2_sda.i2c2_sda=0x100
- oprofile.timer= [HW]
- Use timer interrupt instead of performance counters
-
- oprofile.cpu_type= Force an oprofile cpu type
- This might be useful if you have an older oprofile
- userland or if you want common events.
- Format: { arch_perfmon }
- arch_perfmon: [X86] Force use of architectural
- perfmon on Intel CPUs instead of the
- CPU specific event set.
- timer: [X86] Force use of architectural NMI
- timer mode (see also oprofile.timer
- for generic hr timer mode)
-
oops=panic Always panic on oopses. Default is to just kill the
process, but there is a small probability of
deadlocking the machine.
diff --git a/Documentation/process/magic-number.rst b/Documentation/process/magic-number.rst
index e02ff5ffb653..c6dfe060ec2f 100644
--- a/Documentation/process/magic-number.rst
+++ b/Documentation/process/magic-number.rst
@@ -135,7 +135,6 @@ FW_HEADER_MAGIC 0x65726F66 fw_header ``drivers/atm/fo
SLOT_MAGIC 0x67267321 slot ``drivers/hotplug/cpqphp.h``
SLOT_MAGIC 0x67267322 slot ``drivers/hotplug/acpiphp.h``
LO_MAGIC 0x68797548 nbd_device ``include/linux/nbd.h``
-OPROFILE_MAGIC 0x6f70726f super_block ``drivers/oprofile/oprofilefs.h``
M3_STATE_MAGIC 0x734d724d m3_state ``sound/oss/maestro3.c``
VMALLOC_MAGIC 0x87654320 snd_alloc_track ``sound/core/memory.c``
KMALLOC_MAGIC 0x87654321 snd_alloc_track ``sound/core/memory.c``
diff --git a/Documentation/translations/it_IT/process/magic-number.rst b/Documentation/translations/it_IT/process/magic-number.rst
index 0243d32a0b59..1af30f4228f2 100644
--- a/Documentation/translations/it_IT/process/magic-number.rst
+++ b/Documentation/translations/it_IT/process/magic-number.rst
@@ -141,7 +141,6 @@ FW_HEADER_MAGIC 0x65726F66 fw_header ``drivers/atm/fo
SLOT_MAGIC 0x67267321 slot ``drivers/hotplug/cpqphp.h``
SLOT_MAGIC 0x67267322 slot ``drivers/hotplug/acpiphp.h``
LO_MAGIC 0x68797548 nbd_device ``include/linux/nbd.h``
-OPROFILE_MAGIC 0x6f70726f super_block ``drivers/oprofile/oprofilefs.h``
M3_STATE_MAGIC 0x734d724d m3_state ``sound/oss/maestro3.c``
VMALLOC_MAGIC 0x87654320 snd_alloc_track ``sound/core/memory.c``
KMALLOC_MAGIC 0x87654321 snd_alloc_track ``sound/core/memory.c``
diff --git a/Documentation/translations/zh_CN/process/magic-number.rst b/Documentation/translations/zh_CN/process/magic-number.rst
index de182bf4191c..7bb9d4165ed3 100644
--- a/Documentation/translations/zh_CN/process/magic-number.rst
+++ b/Documentation/translations/zh_CN/process/magic-number.rst
@@ -124,7 +124,6 @@ FW_HEADER_MAGIC 0x65726F66 fw_header ``drivers/atm/fo
SLOT_MAGIC 0x67267321 slot ``drivers/hotplug/cpqphp.h``
SLOT_MAGIC 0x67267322 slot ``drivers/hotplug/acpiphp.h``
LO_MAGIC 0x68797548 nbd_device ``include/linux/nbd.h``
-OPROFILE_MAGIC 0x6f70726f super_block ``drivers/oprofile/oprofilefs.h``
M3_STATE_MAGIC 0x734d724d m3_state ``sound/oss/maestro3.c``
VMALLOC_MAGIC 0x87654320 snd_alloc_track ``sound/core/memory.c``
KMALLOC_MAGIC 0x87654321 snd_alloc_track ``sound/core/memory.c``
diff --git a/MAINTAINERS b/MAINTAINERS
index cc1e6a5ee6e6..ae2c2cef9d96 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1414,7 +1414,6 @@ F: arch/arm*/include/asm/hw_breakpoint.h
F: arch/arm*/include/asm/perf_event.h
F: arch/arm*/kernel/hw_breakpoint.c
F: arch/arm*/kernel/perf_*
-F: arch/arm/oprofile/common.c
F: drivers/perf/
F: include/linux/perf/arm_pmu.h
@@ -4083,7 +4082,6 @@ W: http://www.ibm.com/developerworks/power/cell/
F: arch/powerpc/include/asm/cell*.h
F: arch/powerpc/include/asm/spu*.h
F: arch/powerpc/include/uapi/asm/spu*.h
-F: arch/powerpc/oprofile/*cell*
F: arch/powerpc/platforms/cell/
CELLWISE CW2015 BATTERY DRIVER
@@ -13311,15 +13309,6 @@ S: Maintained
T: git git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git
F: sound/drivers/opl4/
-OPROFILE
-M: Robert Richter <rr...@ke...>
-L: opr...@li...
-S: Maintained
-F: arch/*/include/asm/oprofile*.h
-F: arch/*/oprofile/
-F: drivers/oprofile/
-F: include/linux/oprofile.h
-
ORACLE CLUSTER FILESYSTEM 2 (OCFS2)
M: Mark Fasheh <ma...@fa...>
M: Joel Becker <jl...@ev...>
diff --git a/arch/Kconfig b/arch/Kconfig
index 24862d15f3a3..40277027a255 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -33,38 +33,6 @@ config HOTPLUG_SMT
config GENERIC_ENTRY
bool
-config OPROFILE
- tristate "OProfile system profiling"
- depends on PROFILING
- depends on HAVE_OPROFILE
- select RING_BUFFER
- select RING_BUFFER_ALLOW_SWAP
- help
- OProfile is a profiling system capable of profiling the
- whole system, include the kernel, kernel modules, libraries,
- and applications.
-
- If unsure, say N.
-
-config OPROFILE_EVENT_MULTIPLEX
- bool "OProfile multiplexing support (EXPERIMENTAL)"
- default n
- depends on OPROFILE && X86
- help
- The number of hardware counters is limited. The multiplexing
- feature enables OProfile to gather more events than counters
- are provided by the hardware. This is realized by switching
- between events at a user specified time interval.
-
- If unsure, say N.
-
-config HAVE_OPROFILE
- bool
-
-config OPROFILE_NMI_TIMER
- def_bool y
- depends on PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !PPC64
-
config KPROBES
bool "Kprobes"
depends on MODULES
diff --git a/drivers/oprofile/buffer_sync.c b/drivers/oprofile/buffer_sync.c
deleted file mode 100644
index cc917865f13a..000000000000
--- a/drivers/oprofile/buffer_sync.c
+++ /dev/null
@@ -1,591 +0,0 @@
-/**
- * @file buffer_sync.c
- *
- * @remark Copyright 2002-2009 OProfile authors
- * @remark Read the file COPYING
- *
- * @author John Levon <le...@mo...>
- * @author Barry Kasindorf
- * @author Robert Richter <rob...@am...>
- *
- * This is the core of the buffer management. Each
- * CPU buffer is processed and entered into the
- * global event buffer. Such processing is necessary
- * in several circumstances, mentioned below.
- *
- * The processing does the job of converting the
- * transitory EIP value into a persistent dentry/offset
- * value that the profiler can record at its leisure.
- *
- * See fs/dcookies.c for a description of the dentry/offset
- * objects.
- */
-
-#include <linux/file.h>
-#include <linux/mm.h>
-#include <linux/workqueue.h>
-#include <linux/notifier.h>
-#include <linux/dcookies.h>
-#include <linux/profile.h>
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/oprofile.h>
-#include <linux/sched.h>
-#include <linux/sched/mm.h>
-#include <linux/sched/task.h>
-#include <linux/gfp.h>
-
-#include "oprofile_stats.h"
-#include "event_buffer.h"
-#include "cpu_buffer.h"
-#include "buffer_sync.h"
-
-static LIST_HEAD(dying_tasks);
-static LIST_HEAD(dead_tasks);
-static cpumask_var_t marked_cpus;
-static DEFINE_SPINLOCK(task_mortuary);
-static void process_task_mortuary(void);
-
-/* Take ownership of the task struct and place it on the
- * list for processing. Only after two full buffer syncs
- * does the task eventually get freed, because by then
- * we are sure we will not reference it again.
- * Can be invoked from softirq via RCU callback due to
- * call_rcu() of the task struct, hence the _irqsave.
- */
-static int
-task_free_notify(struct notifier_block *self, unsigned long val, void *data)
-{
- unsigned long flags;
- struct task_struct *task = data;
- spin_lock_irqsave(&task_mortuary, flags);
- list_add(&task->tasks, &dying_tasks);
- spin_unlock_irqrestore(&task_mortuary, flags);
- return NOTIFY_OK;
-}
-
-
-/* The task is on its way out. A sync of the buffer means we can catch
- * any remaining samples for this task.
- */
-static int
-task_exit_notify(struct notifier_block *self, unsigned long val, void *data)
-{
- /* To avoid latency problems, we only process the current CPU,
- * hoping that most samples for the task are on this CPU
- */
- sync_buffer(raw_smp_processor_id());
- return 0;
-}
-
-
-/* The task is about to try a do_munmap(). We peek at what it's going to
- * do, and if it's an executable region, process the samples first, so
- * we don't lose any. This does not have to be exact, it's a QoI issue
- * only.
- */
-static int
-munmap_notify(struct notifier_block *self, unsigned long val, void *data)
-{
- unsigned long addr = (unsigned long)data;
- struct mm_struct *mm = current->mm;
- struct vm_area_struct *mpnt;
-
- mmap_read_lock(mm);
-
- mpnt = find_vma(mm, addr);
- if (mpnt && mpnt->vm_file && (mpnt->vm_flags & VM_EXEC)) {
- mmap_read_unlock(mm);
- /* To avoid latency problems, we only process the current CPU,
- * hoping that most samples for the task are on this CPU
- */
- sync_buffer(raw_smp_processor_id());
- return 0;
- }
-
- mmap_read_unlock(mm);
- return 0;
-}
-
-
-/* We need to be told about new modules so we don't attribute to a previously
- * loaded module, or drop the samples on the floor.
- */
-static int
-module_load_notify(struct notifier_block *self, unsigned long val, void *data)
-{
-#ifdef CONFIG_MODULES
- if (val != MODULE_STATE_COMING)
- return NOTIFY_DONE;
-
- /* FIXME: should we process all CPU buffers ? */
- mutex_lock(&buffer_mutex);
- add_event_entry(ESCAPE_CODE);
- add_event_entry(MODULE_LOADED_CODE);
- mutex_unlock(&buffer_mutex);
-#endif
- return NOTIFY_OK;
-}
-
-
-static struct notifier_block task_free_nb = {
- .notifier_call = task_free_notify,
-};
-
-static struct notifier_block task_exit_nb = {
- .notifier_call = task_exit_notify,
-};
-
-static struct notifier_block munmap_nb = {
- .notifier_call = munmap_notify,
-};
-
-static struct notifier_block module_load_nb = {
- .notifier_call = module_load_notify,
-};
-
-static void free_all_tasks(void)
-{
- /* make sure we don't leak task structs */
- process_task_mortuary();
- process_task_mortuary();
-}
-
-int sync_start(void)
-{
- int err;
-
- if (!zalloc_cpumask_var(&marked_cpus, GFP_KERNEL))
- return -ENOMEM;
-
- err = task_handoff_register(&task_free_nb);
- if (err)
- goto out1;
- err = profile_event_register(PROFILE_TASK_EXIT, &task_exit_nb);
- if (err)
- goto out2;
- err = profile_event_register(PROFILE_MUNMAP, &munmap_nb);
- if (err)
- goto out3;
- err = register_module_notifier(&module_load_nb);
- if (err)
- goto out4;
-
- start_cpu_work();
-
-out:
- return err;
-out4:
- profile_event_unregister(PROFILE_MUNMAP, &munmap_nb);
-out3:
- profile_event_unregister(PROFILE_TASK_EXIT, &task_exit_nb);
-out2:
- task_handoff_unregister(&task_free_nb);
- free_all_tasks();
-out1:
- free_cpumask_var(marked_cpus);
- goto out;
-}
-
-
-void sync_stop(void)
-{
- end_cpu_work();
- unregister_module_notifier(&module_load_nb);
- profile_event_unregister(PROFILE_MUNMAP, &munmap_nb);
- profile_event_unregister(PROFILE_TASK_EXIT, &task_exit_nb);
- task_handoff_unregister(&task_free_nb);
- barrier(); /* do all of the above first */
-
- flush_cpu_work();
-
- free_all_tasks();
- free_cpumask_var(marked_cpus);
-}
-
-
-/* Optimisation. We can manage without taking the dcookie sem
- * because we cannot reach this code without at least one
- * dcookie user still being registered (namely, the reader
- * of the event buffer). */
-static inline unsigned long fast_get_dcookie(const struct path *path)
-{
- unsigned long cookie;
-
- if (path->dentry->d_flags & DCACHE_COOKIE)
- return (unsigned long)path->dentry;
- get_dcookie(path, &cookie);
- return cookie;
-}
-
-
-/* Look up the dcookie for the task's mm->exe_file,
- * which corresponds loosely to "application name". This is
- * not strictly necessary but allows oprofile to associate
- * shared-library samples with particular applications
- */
-static unsigned long get_exec_dcookie(struct mm_struct *mm)
-{
- unsigned long cookie = NO_COOKIE;
- struct file *exe_file;
-
- if (!mm)
- goto done;
-
- exe_file = get_mm_exe_file(mm);
- if (!exe_file)
- goto done;
-
- cookie = fast_get_dcookie(&exe_file->f_path);
- fput(exe_file);
-done:
- return cookie;
-}
-
-
-/* Convert the EIP value of a sample into a persistent dentry/offset
- * pair that can then be added to the global event buffer. We make
- * sure to do this lookup before a mm->mmap modification happens so
- * we don't lose track.
- *
- * The caller must ensure the mm is not nil (ie: not a kernel thread).
- */
-static unsigned long
-lookup_dcookie(struct mm_struct *mm, unsigned long addr, off_t *offset)
-{
- unsigned long cookie = NO_COOKIE;
- struct vm_area_struct *vma;
-
- mmap_read_lock(mm);
- for (vma = find_vma(mm, addr); vma; vma = vma->vm_next) {
-
- if (addr < vma->vm_start || addr >= vma->vm_end)
- continue;
-
- if (vma->vm_file) {
- cookie = fast_get_dcookie(&vma->vm_file->f_path);
- *offset = (vma->vm_pgoff << PAGE_SHIFT) + addr -
- vma->vm_start;
- } else {
- /* must be an anonymous map */
- *offset = addr;
- }
-
- break;
- }
-
- if (!vma)
- cookie = INVALID_COOKIE;
- mmap_read_unlock(mm);
-
- return cookie;
-}
-
-static unsigned long last_cookie = INVALID_COOKIE;
-
-static void add_cpu_switch(int i)
-{
- add_event_entry(ESCAPE_CODE);
- add_event_entry(CPU_SWITCH_CODE);
- add_event_entry(i);
- last_cookie = INVALID_COOKIE;
-}
-
-static void add_kernel_ctx_switch(unsigned int in_kernel)
-{
- add_event_entry(ESCAPE_CODE);
- if (in_kernel)
- add_event_entry(KERNEL_ENTER_SWITCH_CODE);
- else
- add_event_entry(KERNEL_EXIT_SWITCH_CODE);
-}
-
-static void
-add_user_ctx_switch(struct task_struct const *task, unsigned long cookie)
-{
- add_event_entry(ESCAPE_CODE);
- add_event_entry(CTX_SWITCH_CODE);
- add_event_entry(task->pid);
- add_event_entry(cookie);
- /* Another code for daemon back-compat */
- add_event_entry(ESCAPE_CODE);
- add_event_entry(CTX_TGID_CODE);
- add_event_entry(task->tgid);
-}
-
-
-static void add_cookie_switch(unsigned long cookie)
-{
- add_event_entry(ESCAPE_CODE);
- add_event_entry(COOKIE_SWITCH_CODE);
- add_event_entry(cookie);
-}
-
-
-static void add_trace_begin(void)
-{
- add_event_entry(ESCAPE_CODE);
- add_event_entry(TRACE_BEGIN_CODE);
-}
-
-static void add_data(struct op_entry *entry, struct mm_struct *mm)
-{
- unsigned long code, pc, val;
- unsigned long cookie;
- off_t offset;
-
- if (!op_cpu_buffer_get_data(entry, &code))
- return;
- if (!op_cpu_buffer_get_data(entry, &pc))
- return;
- if (!op_cpu_buffer_get_size(entry))
- return;
-
- if (mm) {
- cookie = lookup_dcookie(mm, pc, &offset);
-
- if (cookie == NO_COOKIE)
- offset = pc;
- if (cookie == INVALID_COOKIE) {
- atomic_inc(&oprofile_stats.sample_lost_no_mapping);
- offset = pc;
- }
- if (cookie != last_cookie) {
- add_cookie_switch(cookie);
- last_cookie = cookie;
- }
- } else
- offset = pc;
-
- add_event_entry(ESCAPE_CODE);
- add_event_entry(code);
- add_event_entry(offset); /* Offset from Dcookie */
-
- while (op_cpu_buffer_get_data(entry, &val))
- add_event_entry(val);
-}
-
-static inline void add_sample_entry(unsigned long offset, unsigned long event)
-{
- add_event_entry(offset);
- add_event_entry(event);
-}
-
-
-/*
- * Add a sample to the global event buffer. If possible the
- * sample is converted into a persistent dentry/offset pair
- * for later lookup from userspace. Return 0 on failure.
- */
-static int
-add_sample(struct mm_struct *mm, struct op_sample *s, int in_kernel)
-{
- unsigned long cookie;
- off_t offset;
-
- if (in_kernel) {
- add_sample_entry(s->eip, s->event);
- return 1;
- }
-
- /* add userspace sample */
-
- if (!mm) {
- atomic_inc(&oprofile_stats.sample_lost_no_mm);
- return 0;
- }
-
- cookie = lookup_dcookie(mm, s->eip, &offset);
-
- if (cookie == INVALID_COOKIE) {
- atomic_inc(&oprofile_stats.sample_lost_no_mapping);
- return 0;
- }
-
- if (cookie != last_cookie) {
- add_cookie_switch(cookie);
- last_cookie = cookie;
- }
-
- add_sample_entry(offset, s->event);
-
- return 1;
-}
-
-
-static void release_mm(struct mm_struct *mm)
-{
- if (!mm)
- return;
- mmput(mm);
-}
-
-static inline int is_code(unsigned long val)
-{
- return val == ESCAPE_CODE;
-}
-
-
-/* Move tasks along towards death. Any tasks on dead_tasks
- * will definitely have no remaining references in any
- * CPU buffers at this point, because we use two lists,
- * and to have reached the list, it must have gone through
- * one full sync already.
- */
-static void process_task_mortuary(void)
-{
- unsigned long flags;
- LIST_HEAD(local_dead_tasks);
- struct task_struct *task;
- struct task_struct *ttask;
-
- spin_lock_irqsave(&task_mortuary, flags);
-
- list_splice_init(&dead_tasks, &local_dead_tasks);
- list_splice_init(&dying_tasks, &dead_tasks);
-
- spin_unlock_irqrestore(&task_mortuary, flags);
-
- list_for_each_entry_safe(task, ttask, &local_dead_tasks, tasks) {
- list_del(&task->tasks);
- free_task(task);
- }
-}
-
-
-static void mark_done(int cpu)
-{
- int i;
-
- cpumask_set_cpu(cpu, marked_cpus);
-
- for_each_online_cpu(i) {
- if (!cpumask_test_cpu(i, marked_cpus))
- return;
- }
-
- /* All CPUs have been processed at least once,
- * we can process the mortuary once
- */
- process_task_mortuary();
-
- cpumask_clear(marked_cpus);
-}
-
-
-/* FIXME: this is not sufficient if we implement syscall barrier backtrace
- * traversal, the code switch to sb_sample_start at first kernel enter/exit
- * switch so we need a fifth state and some special handling in sync_buffer()
- */
-typedef enum {
- sb_bt_ignore = -2,
- sb_buffer_start,
- sb_bt_start,
- sb_sample_start,
-} sync_buffer_state;
-
-/* Sync one of the CPU's buffers into the global event buffer.
- * Here we need to go through each batch of samples punctuated
- * by context switch notes, taking the task's mmap_lock and doing
- * lookup in task->mm->mmap to convert EIP into dcookie/offset
- * value.
- */
-void sync_buffer(int cpu)
-{
- struct mm_struct *mm = NULL;
- struct mm_struct *oldmm;
- unsigned long val;
- struct task_struct *new;
- unsigned long cookie = 0;
- int in_kernel = 1;
- sync_buffer_state state = sb_buffer_start;
- unsigned int i;
- unsigned long available;
- unsigned long flags;
- struct op_entry entry;
- struct op_sample *sample;
-
- mutex_lock(&buffer_mutex);
-
- add_cpu_switch(cpu);
-
- op_cpu_buffer_reset(cpu);
- available = op_cpu_buffer_entries(cpu);
-
- for (i = 0; i < available; ++i) {
- sample = op_cpu_buffer_read_entry(&entry, cpu);
- if (!sample)
- break;
-
- if (is_code(sample->eip)) {
- flags = sample->event;
- if (flags & TRACE_BEGIN) {
- state = sb_bt_start;
- add_trace_begin();
- }
- if (flags & KERNEL_CTX_SWITCH) {
- /* kernel/userspace switch */
- in_kernel = flags & IS_KERNEL;
- if (state == sb_buffer_start)
- state = sb_sample_start;
- add_kernel_ctx_switch(flags & IS_KERNEL);
- }
- if (flags & USER_CTX_SWITCH
- && op_cpu_buffer_get_data(&entry, &val)) {
- /* userspace context switch */
- new = (struct task_struct *)val;
- oldmm = mm;
- release_mm(oldmm);
- mm = get_task_mm(new);
- if (mm != oldmm)
- cookie = get_exec_dcookie(mm);
- add_user_ctx_switch(new, cookie);
- }
- if (op_cpu_buffer_get_size(&entry))
- add_data(&entry, mm);
- continue;
- }
-
- if (state < sb_bt_start)
- /* ignore sample */
- continue;
-
- if (add_sample(mm, sample, in_kernel))
- continue;
-
- /* ignore backtraces if failed to add a sample */
- if (state == sb_bt_start) {
- state = sb_bt_ignore;
- atomic_inc(&oprofile_stats.bt_lost_no_mapping);
- }
- }
- release_mm(mm);
-
- mark_done(cpu);
-
- mutex_unlock(&buffer_mutex);
-}
-
-/* The function can be used to add a buffer worth of data directly to
- * the kernel buffer. The buffer is assumed to be a circular buffer.
- * Take the entries from index start and end at index end, wrapping
- * at max_entries.
- */
-void oprofile_put_buff(unsigned long *buf, unsigned int start,
- unsigned int stop, unsigned int max)
-{
- int i;
-
- i = start;
-
- mutex_lock(&buffer_mutex);
- while (i != stop) {
- add_event_entry(buf[i++]);
-
- if (i >= max)
- i = 0;
- }
-
- mutex_unlock(&buffer_mutex);
-}
-
diff --git a/drivers/oprofile/buffer_sync.h b/drivers/oprofile/buffer_sync.h
deleted file mode 100644
index 3110732c1835..000000000000
--- a/drivers/oprofile/buffer_sync.h
+++ /dev/null
@@ -1,22 +0,0 @@
-/**
- * @file buffer_sync.h
- *
- * @remark Copyright 2002 OProfile authors
- * @remark Read the file COPYING
- *
- * @author John Levon <le...@mo...>
- */
-
-#ifndef OPROFILE_BUFFER_SYNC_H
-#define OPROFILE_BUFFER_SYNC_H
-
-/* add the necessary profiling hooks */
-int sync_start(void);
-
-/* remove the hooks */
-void sync_stop(void);
-
-/* sync the given CPU's buffer */
-void sync_buffer(int cpu);
-
-#endif /* OPROFILE_BUFFER_SYNC_H */
diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
deleted file mode 100644
index 9210a95cb4e6..000000000000
--- a/drivers/oprofile/cpu_buffer.c
+++ /dev/null
@@ -1,465 +0,0 @@
-/**
- * @file cpu_buffer.c
- *
- * @remark Copyright 2002-2009 OProfile authors
- * @remark Read the file COPYING
- *
- * @author John Levon <le...@mo...>
- * @author Barry Kasindorf <bar...@am...>
- * @author Robert Richter <rob...@am...>
- *
- * Each CPU has a local buffer that stores PC value/event
- * pairs. We also log context switches when we notice them.
- * Eventually each CPU's buffer is processed into the global
- * event buffer by sync_buffer().
- *
- * We use a local buffer for two reasons: an NMI or similar
- * interrupt cannot synchronise, and high sampling rates
- * would lead to catastrophic global synchronisation if
- * a global buffer was used.
- */
-
-#include <linux/sched.h>
-#include <linux/oprofile.h>
-#include <linux/errno.h>
-
-#include <asm/ptrace.h>
-
-#include "event_buffer.h"
-#include "cpu_buffer.h"
-#include "buffer_sync.h"
-#include "oprof.h"
-
-#define OP_BUFFER_FLAGS 0
-
-static struct trace_buffer *op_ring_buffer;
-DEFINE_PER_CPU(struct oprofile_cpu_buffer, op_cpu_buffer);
-
-static void wq_sync_buffer(struct work_struct *work);
-
-#define DEFAULT_TIMER_EXPIRE (HZ / 10)
-static int work_enabled;
-
-unsigned long oprofile_get_cpu_buffer_size(void)
-{
- return oprofile_cpu_buffer_size;
-}
-
-void oprofile_cpu_buffer_inc_smpl_lost(void)
-{
- struct oprofile_cpu_buffer *cpu_buf = this_cpu_ptr(&op_cpu_buffer);
-
- cpu_buf->sample_lost_overflow++;
-}
-
-void free_cpu_buffers(void)
-{
- if (op_ring_buffer)
- ring_buffer_free(op_ring_buffer);
- op_ring_buffer = NULL;
-}
-
-#define RB_EVENT_HDR_SIZE 4
-
-int alloc_cpu_buffers(void)
-{
- int i;
-
- unsigned long buffer_size = oprofile_cpu_buffer_size;
- unsigned long byte_size = buffer_size * (sizeof(struct op_sample) +
- RB_EVENT_HDR_SIZE);
-
- op_ring_buffer = ring_buffer_alloc(byte_size, OP_BUFFER_FLAGS);
- if (!op_ring_buffer)
- goto fail;
-
- for_each_possible_cpu(i) {
- struct oprofile_cpu_buffer *b = &per_cpu(op_cpu_buffer, i);
-
- b->last_task = NULL;
- b->last_is_kernel = -1;
- b->tracing = 0;
- b->buffer_size = buffer_size;
- b->sample_received = 0;
- b->sample_lost_overflow = 0;
- b->backtrace_aborted = 0;
- b->sample_invalid_eip = 0;
- b->cpu = i;
- INIT_DELAYED_WORK(&b->work, wq_sync_buffer);
- }
- return 0;
-
-fail:
- free_cpu_buffers();
- return -ENOMEM;
-}
-
-void start_cpu_work(void)
-{
- int i;
-
- work_enabled = 1;
-
- for_each_online_cpu(i) {
- struct oprofile_cpu_buffer *b = &per_cpu(op_cpu_buffer, i);
-
- /*
- * Spread the work by 1 jiffy per cpu so they dont all
- * fire at once.
- */
- schedule_delayed_work_on(i, &b->work, DEFAULT_TIMER_EXPIRE + i);
- }
-}
-
-void end_cpu_work(void)
-{
- work_enabled = 0;
-}
-
-void flush_cpu_work(void)
-{
- int i;
-
- for_each_online_cpu(i) {
- struct oprofile_cpu_buffer *b = &per_cpu(op_cpu_buffer, i);
-
- /* these works are per-cpu, no need for flush_sync */
- flush_delayed_work(&b->work);
- }
-}
-
-/*
- * This function prepares the cpu buffer to write a sample.
- *
- * Struct op_entry is used during operations on the ring buffer while
- * struct op_sample contains the data that is stored in the ring
- * buffer. Struct entry can be uninitialized. The function reserves a
- * data array that is specified by size. Use
- * op_cpu_buffer_write_commit() after preparing the sample. In case of
- * errors a null pointer is returned, otherwise the pointer to the
- * sample.
- *
- */
-struct op_sample
-*op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size)
-{
- entry->event = ring_buffer_lock_reserve
- (op_ring_buffer, sizeof(struct op_sample) +
- size * sizeof(entry->sample->data[0]));
- if (!entry->event)
- return NULL;
- entry->sample = ring_buffer_event_data(entry->event);
- entry->size = size;
- entry->data = entry->sample->data;
-
- return entry->sample;
-}
-
-int op_cpu_buffer_write_commit(struct op_entry *entry)
-{
- return ring_buffer_unlock_commit(op_ring_buffer, entry->event);
-}
-
-struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu)
-{
- struct ring_buffer_event *e;
- e = ring_buffer_consume(op_ring_buffer, cpu, NULL, NULL);
- if (!e)
- return NULL;
-
- entry->event = e;
- entry->sample = ring_buffer_event_data(e);
- entry->size = (ring_buffer_event_length(e) - sizeof(struct op_sample))
- / sizeof(entry->sample->data[0]);
- entry->data = entry->sample->data;
- return entry->sample;
-}
-
-unsigned long op_cpu_buffer_entries(int cpu)
-{
- return ring_buffer_entries_cpu(op_ring_buffer, cpu);
-}
-
-static int
-op_add_code(struct oprofile_cpu_buffer *cpu_buf, unsigned long backtrace,
- int is_kernel, struct task_struct *task)
-{
- struct op_entry entry;
- struct op_sample *sample;
- unsigned long flags;
- int size;
-
- flags = 0;
-
- if (backtrace)
- flags |= TRACE_BEGIN;
-
- /* notice a switch from user->kernel or vice versa */
- is_kernel = !!is_kernel;
- if (cpu_buf->last_is_kernel != is_kernel) {
- cpu_buf->last_is_kernel = is_kernel;
- flags |= KERNEL_CTX_SWITCH;
- if (is_kernel)
- flags |= IS_KERNEL;
- }
-
- /* notice a task switch */
- if (cpu_buf->last_task != task) {
- cpu_buf->last_task = task;
- flags |= USER_CTX_SWITCH;
- }
-
- if (!flags)
- /* nothing to do */
- return 0;
-
- if (flags & USER_CTX_SWITCH)
- size = 1;
- else
- size = 0;
-
- sample = op_cpu_buffer_write_reserve(&entry, size);
- if (!sample)
- return -ENOMEM;
-
- sample->eip = ESCAPE_CODE;
- sample->event = flags;
-
- if (size)
- op_cpu_buffer_add_data(&entry, (unsigned long)task);
-
- op_cpu_buffer_write_commit(&entry);
-
- return 0;
-}
-
-static inline int
-op_add_sample(struct oprofile_cpu_buffer *cpu_buf,
- unsigned long pc, unsigned long event)
-{
- struct op_entry entry;
- struct op_sample *sample;
-
- sample = op_cpu_buffer_write_reserve(&entry, 0);
- if (!sample)
- return -ENOMEM;
-
- sample->eip = pc;
- sample->event = event;
-
- return op_cpu_buffer_write_commit(&entry);
-}
-
-/*
- * This must be safe from any context.
- *
- * is_kernel is needed because on some architectures you cannot
- * tell if you are in kernel or user space simply by looking at
- * pc. We tag this in the buffer by generating kernel enter/exit
- * events whenever is_kernel changes
- */
-static int
-log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc,
- unsigned long backtrace, int is_kernel, unsigned long event,
- struct task_struct *task)
-{
- struct task_struct *tsk = task ? task : current;
- cpu_buf->sample_received++;
-
- if (pc == ESCAPE_CODE) {
- cpu_buf->sample_invalid_eip++;
- return 0;
- }
-
- if (op_add_code(cpu_buf, backtrace, is_kernel, tsk))
- goto fail;
-
- if (op_add_sample(cpu_buf, pc, event))
- goto fail;
-
- return 1;
-
-fail:
- cpu_buf->sample_lost_overflow++;
- return 0;
-}
-
-static inline void oprofile_begin_trace(struct oprofile_cpu_buffer *cpu_buf)
-{
- cpu_buf->tracing = 1;
-}
-
-static inline void oprofile_end_trace(struct oprofile_cpu_buffer *cpu_buf)
-{
- cpu_buf->tracing = 0;
-}
-
-static inline void
-__oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
- unsigned long event, int is_kernel,
- struct task_struct *task)
-{
- struct oprofile_cpu_buffer *cpu_buf = this_cpu_ptr(&op_cpu_buffer);
- unsigned long backtrace = oprofile_backtrace_depth;
-
- /*
- * if log_sample() fail we can't backtrace since we lost the
- * source of this event
- */
- if (!log_sample(cpu_buf, pc, backtrace, is_kernel, event, task))
- /* failed */
- return;
-
- if (!backtrace)
- return;
-
- oprofile_begin_trace(cpu_buf);
- oprofile_ops.backtrace(regs, backtrace);
- oprofile_end_trace(cpu_buf);
-}
-
-void oprofile_add_ext_hw_sample(unsigned long pc, struct pt_regs * const regs,
- unsigned long event, int is_kernel,
- struct task_struct *task)
-{
- __oprofile_add_ext_sample(pc, regs, event, is_kernel, task);
-}
-
-void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
- unsigned long event, int is_kernel)
-{
- __oprofile_add_ext_sample(pc, regs, event, is_kernel, NULL);
-}
-
-void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)
-{
- int is_kernel;
- unsigned long pc;
-
- if (likely(regs)) {
- is_kernel = !user_mode(regs);
- pc = profile_pc(regs);
- } else {
- is_kernel = 0; /* This value will not be used */
- pc = ESCAPE_CODE; /* as this causes an early return. */
- }
-
- __oprofile_add_ext_sample(pc, regs, event, is_kernel, NULL);
-}
-
-/*
- * Add samples with data to the ring buffer.
- *
- * Use oprofile_add_data(&entry, val) to add data and
- * oprofile_write_commit(&entry) to commit the sample.
- */
-void
-oprofile_write_reserve(struct op_entry *entry, struct pt_regs * const regs,
- unsigned long pc, int code, int size)
-{
- struct op_sample *sample;
- int is_kernel = !user_mode(regs);
- struct oprofile_cpu_buffer *cpu_buf = this_cpu_ptr(&op_cpu_buffer);
-
- cpu_buf->sample_received++;
-
- /* no backtraces for samples with data */
- if (op_add_code(cpu_buf, 0, is_kernel, current))
- goto fail;
-
- sample = op_cpu_buffer_write_reserve(entry, size + 2);
- if (!sample)
- goto fail;
- sample->eip = ESCAPE_CODE;
- sample->event = 0; /* no flags */
-
- op_cpu_buffer_add_data(entry, code);
- op_cpu_buffer_add_data(entry, pc);
-
- return;
-
-fail:
- entry->event = NULL;
- cpu_buf->sample_lost_overflow++;
-}
-
-int oprofile_add_data(struct op_entry *entry, unsigned long val)
-{
- if (!entry->event)
- return 0;
- return op_cpu_buffer_add_data(entry, val);
-}
-
-int oprofile_add_data64(struct op_entry *entry, u64 val)
-{
- if (!entry->event)
- return 0;
- if (op_cpu_buffer_get_size(entry) < 2)
- /*
- * the function returns 0 to indicate a too small
- * buffer, even if there is some space left
- */
- return 0;
- if (!op_cpu_buffer_add_data(entry, (u32)val))
- return 0;
- return op_cpu_buffer_add_data(entry, (u32)(val >> 32));
-}
-
-int oprofile_write_commit(struct op_entry *entry)
-{
- if (!entry->event)
- return -EINVAL;
- return op_cpu_buffer_write_commit(entry);
-}
-
-void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event)
-{
- struct oprofile_cpu_buffer *cpu_buf = this_cpu_ptr(&op_cpu_buffer);
- log_sample(cpu_buf, pc, 0, is_kernel, event, NULL);
-}
-
-void oprofile_add_trace(unsigned long pc)
-{
- struct oprofile_cpu_buffer *cpu_buf = this_cpu_ptr(&op_cpu_buffer);
-
- if (!cpu_buf->tracing)
- return;
-
- /*
- * broken frame can give an eip with the same value as an
- * escape code, abort the trace if we get it
- */
- if (pc == ESCAPE_CODE)
- goto fail;
-
- if (op_add_sample(cpu_buf, pc, 0))
- goto fail;
-
- return;
-fail:
- cpu_buf->tracing = 0;
- cpu_buf->backtrace_aborted++;
- return;
-}
-
-/*
- * This serves to avoid cpu buffer overflow, and makes sure
- * the task mortuary progresses
- *
- * By using schedule_delayed_work_on and then schedule_delayed_work
- * we guarantee this will stay on the correct cpu
- */
-static void wq_sync_buffer(struct work_struct *work)
-{
- struct oprofile_cpu_buffer *b =
- container_of(work, struct oprofile_cpu_buffer, work.work);
- if (b->cpu != smp_processor_id() && !cpu_online(b->cpu)) {
- cancel_delayed_work(&b->work);
- return;
- }
- sync_buffer(b->cpu);
-
- /* don't re-add the work if we're shutting down */
- if (work_enabled)
- schedule_delayed_work(&b->work, DEFAULT_TIMER_EXPIRE);
-}
diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h
deleted file mode 100644
index 31478c0cff87..000000000000
--- a/drivers/oprofile/cpu_buffer.h
+++ /dev/null
@@ -1,121 +0,0 @@
-/**
- * @file cpu_buffer.h
- *
- * @remark Copyright 2002-2009 OProfile authors
- * @remark Read the file COPYING
- *
- * @author John Levon <le...@mo...>
- * @author Robert Richter <rob...@am...>
- */
-
-#ifndef OPROFILE_CPU_BUFFER_H
-#define OPROFILE_CPU_BUFFER_H
-
-#include <linux/types.h>
-#include <linux/spinlock.h>
-#include <linux/workqueue.h>
-#include <linux/cache.h>
-#include <linux/sched.h>
-#include <linux/ring_buffer.h>
-
-struct task_struct;
-
-int alloc_cpu_buffers(void);
-void free_cpu_buffers(void);
-
-void start_cpu_work(void);
-void end_cpu_work(void);
-void flush_cpu_work(void);
-
-/* CPU buffer is composed of such entries (which are
- * also used for context switch notes)
- */
-struct op_sample {
- unsigned long eip;
- unsigned long event;
- unsigned long data[];
-};
-
-struct op_entry;
-
-struct oprofile_cpu_buffer {
- unsigned long buffer_size;
- struct task_struct *last_task;
- int last_is_kernel;
- int tracing;
- unsigned long sample_received;
- unsigned long sample_lost_overflow;
- unsigned long backtrace_aborted;
- unsigned long sample_invalid_eip;
- int cpu;
- struct delayed_work work;
-};
-
-DECLARE_PER_CPU(struct oprofile_cpu_buffer, op_cpu_buffer);
-
-/*
- * Resets the cpu buffer to a sane state.
- *
- * reset these to invalid values; the next sample collected will
- * populate the buffer with proper values to initialize the buffer
- */
-static inline void op_cpu_buffer_reset(int cpu)
-{
- struct oprofile_cpu_buffer *cpu_buf = &per_cpu(op_cpu_buffer, cpu);
-
- cpu_buf->last_is_kernel = -1;
- cpu_buf->last_task = NULL;
-}
-
-/*
- * op_cpu_buffer_add_data() and op_cpu_buffer_write_commit() may be
- * called only if op_cpu_buffer_write_reserve() did not return NULL or
- * entry->event != NULL, otherwise entry->size or entry->event will be
- * used uninitialized.
- */
-
-struct op_sample
-*op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size);
-int op_cpu_buffer_write_commit(struct op_entry *entry);
-struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu);
-unsigned long op_cpu_buffer_entries(int cpu);
-
-/* returns the remaining free size of data in the entry */
-static inline
-int op_cpu_buffer_add_data(struct op_entry *entry, unsigned long val)
-{
- if (!entry->size)
- return 0;
- *entry->data = val;
- entry->size--;
- entry->data++;
- return entry->size;
-}
-
-/* returns the size of data in the entry */
-static inline
-int op_cpu_buffer_get_size(struct op_entry *entry)
-{
- return entry->size;
-}
-
-/* returns 0 if empty or the size of data including the current value */
-static inline
-int op_cpu_buffer_get_data(struct op_entry *entry, unsigned long *val)
-{
- int size = entry->size;
- if (!size)
- return 0;
- *val = *entry->data;
- entry->size--;
- entry->data++;
- return size;
-}
-
-/* extra data flags */
-#define KERNEL_CTX_SWITCH (1UL << 0)
-#define IS_KERNEL (1UL << 1)
-#define TRACE_BEGIN (1UL << 2)
-#define USER_CTX_SWITCH (1UL << 3)
-
-#endif /* OPROFILE_CPU_BUFFER_H */
diff --git a/drivers/oprofile/event_buffer.c b/drivers/oprofile/event_buffer.c
deleted file mode 100644
index 6c9edc8bbc95..000000000000
--- a/drivers/oprofile/event_buffer.c
+++ /dev/null
@@ -1,209 +0,0 @@
-/**
- * @file event_buffer.c
- *
- * @remark Copyright 2002 OProfile authors
- * @remark Read the file COPYING
- *
- * @author John Levon <le...@mo...>
- *
- * This is the global event buffer that the user-space
- * daemon reads from. The event buffer is an untyped array
- * of unsigned longs. Entries are prefixed by the
- * escape value ESCAPE_CODE followed by an identifying code.
- */
-
-#include <linux/vmalloc.h>
-#include <linux/oprofile.h>
-#include <linux/sched/signal.h>
-#include <linux/capability.h>
-#include <linux/dcookies.h>
-#include <linux/fs.h>
-#include <linux/uaccess.h>
-
-#include "oprof.h"
-#include "event_buffer.h"
-#include "oprofile_stats.h"
-
-DEFINE_MUTEX(buffer_mutex);
-
-static unsigned long buffer_opened;
-static DECLARE_WAIT_QUEUE_HEAD(buffer_wait);
-static unsigned long *event_buffer;
-static unsigned long buffer_size;
-static unsigned long buffer_watershed;
-static size_t buffer_pos;
-/* atomic_t because wait_event checks it outside of buffer_mutex */
-static atomic_t buffer_ready = ATOMIC_INIT(0);
-
-/*
- * Add an entry to the event buffer. When we get near to the end we
- * wake up the process sleeping on the read() of the file. To protect
- * the event_buffer this function may only be called when buffer_mutex
- * is set.
- */
-void add_event_entry(unsigned long value)
-{
- /*
- * This shouldn't happen since all workqueues or handlers are
- * canceled or flushed before the event buffer is freed.
- */
- if (!event_buffer) {
- WARN_ON_ONCE(1);
- return;
- }
-
- if (buffer_pos == buffer_size) {
- atomic_inc(&oprofile_stats.event_lost_overflow);
- return;
- }
-
- event_buffer[buffer_pos] = value;
- if (++buffer_pos == buffer_size - buffer_watershed) {
- atomic_set(&buffer_ready, 1);
- wake_up(&buffer_wait);
- }
-}
-
-
-/* Wake up the waiting process if any. This happens
- * on "echo 0 >/dev/oprofile/enable" so the daemon
- * processes the data remaining in the event buffer.
- */
-void wake_up_buffer_waiter(void)
-{
- mutex_lock(&buffer_mutex);
- atomic_set(&buffer_ready, 1);
- wake_up(&buffer_wait);
- mutex_unlock(&buffer_mutex);
-}
-
-
-int alloc_event_buffer(void)
-{
- unsigned long flags;
-
- raw_spin_lock_irqsave(&oprofilefs_lock, flags);
- buffer_size = oprofile_buffer_size;
- buffer_watershed = oprofile_buffer_watershed;
- raw_spin_unlock_irqrestore(&oprofilefs_lock, flags);
-
- if (buffer_watershed >= buffer_size)
- return -EINVAL;
-
- buffer_pos = 0;
- event_buffer = vmalloc(array_size(buffer_size, sizeof(unsigned long)));
- if (!event_buffer)
- return -ENOMEM;
-
- return 0;
-}
-
-
-void free_event_buffer(void)
-{
- mutex_lock(&buffer_mutex);
- vfree(event_buffer);
- buffer_pos = 0;
- event_buffer = NULL;
- mutex_unlock(&buffer_mutex);
-}
-
-
-static int event_buffer_open(struct inode *inode, struct file *file)
-{
- int err = -EPERM;
-
- if (!perfmon_capable())
- return -EPERM;
-
- if (test_and_set_bit_lock(0, &buffer_opened))
- return -EBUSY;
-
- /* Register as a user of dcookies
- * to ensure they persist for the lifetime of
- * the open event file
- */
- err = -EINVAL;
- file->private_data = dcookie_register();
- if (!file->private_data)
- goto out;
-
- if ((err = oprofile_setup()))
- goto fail;
-
- /* NB: the actual start happens from userspace
- * echo 1 >/dev/oprofile/enable
- */
-
- return nonseekable_open(inode, file);
-
-fail:
- dcookie_unregister(file->private_data);
-out:
- __clear_bit_unlock(0, &buffer_opened);
- return err;
-}
-
-
-static int event_buffer_release(struct inode *inode, struct file *file)
-{
- oprofile_stop();
- oprofile_shutdown();
- dcookie_unregister(file->private_data);
- buffer_pos = 0;
- atomic_set(&buffer_ready, 0);
- __clear_bit_unlock(0, &buffer_opened);
- return 0;
-}
-
-
-static ssize_t event_buffer_read(struct file *file, char __user *buf,
- size_t count, loff_t *offset)
-{
- int retval = -EINVAL;
- size_t const max = buffer_size * sizeof(unsigned long);
-
- /* handling partial reads is more trouble than it's worth */
- if (count != max || *offset)
- return -EINVAL;
-
- wait_event_interruptible(buffer_wait, atomic_read(&buffer_ready));
-
- if (signal_pending(current))
- return -EINTR;
-
- /* can't currently happen */
- if (!atomic_read(&buffer_ready))
- return -EAGAIN;
-
- mutex_lock(&buffer_mutex);
-
- /* May happen if the buffer is freed during pending reads. */
- if (!event_buffer) {
- retval = -EINTR;
- goto out;
- }
-
- atomic_set(&buffer_ready, 0);
-
- retval = -EFAULT;
-
- count = buffer_pos * sizeof(unsigned long);
-
- if (copy_to_user(buf, event_buffer, count))
- goto out;
-
- retval = count;
- buffer_pos = 0;
-
-out:
- mutex_unlock(&buffer_mutex);
- return retval;
-}
-
-const struct file_operations event_buffer_fops = {
- .open = event_buffer_open,
- .release = event_buffer_release,
- .read = event_buffer_read,
- .llseek = no_llseek,
-};
diff --git a/drivers/oprofile/event_buffer.h b/drivers/oprofile/event_buffer.h
deleted file mode 100644
index a8d5bb3cba89..000000000000
--- a/drivers/oprofile/event_buffer.h
+++ /dev/null
@@ -1,40 +0,0 @@
-/**
- * @file event_buffer.h
- *
- * @remark Copyright 2002 OProfile authors
- * @remark Read the file COPYING
- *
- * @author John Levon <le...@mo...>
- */
-
-#ifndef EVENT_BUFFER_H
-#define EVENT_BUFFER_H
-
-#include <linux/types.h>
-#include <linux/mutex.h>
-
-int alloc_event_buffer(void);
-
-void free_event_buffer(void);
-
-/**
- * Add data to the event buffer.
- * The data passed is free-form, but typically consists of
- * file offsets, dcookies, context information, and ESCAPE codes.
- */
-void add_event_entry(unsigned long data);
-
-/* wake up the process sleeping on the event file */
-void wake_up_buffer_waiter(void);
-
-#define INVALID_COOKIE ~0UL
-#define NO_COOKIE 0UL
-
-extern const struct file_operations event_buffer_fops;
-
-/* mutex between sync_cpu_buffers() and the
- * file reading code.
- */
-extern struct mutex buffer_mutex;
-
-#endif /* EVENT_BUFFER_H */
diff --git a/drivers/oprofile/nmi_timer_int.c b/drivers/oprofile/nmi_timer_int.c
deleted file mode 100644
index f343bd96609a..000000000000
--- a/drivers/oprofile/nmi_timer_int.c
+++ /dev/null
@@ -1,157 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/**
- * @file nmi_timer_int.c
- *
- * @remark Copyright 2011 Advanced Micro Devices, Inc.
- *
- * @author Robert Richter <rob...@am...>
- */
-
-#include <linux/init.h>
-#include <linux/smp.h>
-#include <linux/errno.h>
-#include <linux/oprofile.h>
-#include <linux/perf_event.h>
-
-#ifdef CONFIG_OPROFILE_NMI_TIMER
-
-static DEFINE_PER_CPU(struct perf_event *, nmi_timer_events);
-static int ctr_running;
-
-static struct perf_event_attr nmi_timer_attr = {
- .type = PERF_TYPE_HARDWARE,
- .config = PERF_COUNT_HW_CPU_CYCLES,
- .size = sizeof(struct perf_event_attr),
- .pinned = 1,
- .disabled = 1,
-};
-
-static void nmi_timer_callback(struct perf_event *event,
- struct perf_sample_data *data,
- struct pt_regs *regs)
-{
- event->hw.interrupts = 0; /* don't throttle interrupts */
- oprofile_add_sample(regs, 0);
-}
-
-static int nmi_timer_start_cpu(int cpu)
-{
- struct perf_event *event = per_cpu(nmi_timer_events, cpu);
-
- if (!event) {
- event = perf_event_create_kernel_counter(&nmi_timer_attr, cpu, NULL,
- nmi_timer_callback, NULL);
- if (IS_ERR(event))
- return PTR_ERR(event);
- per_cpu(nmi_timer_events, cpu) = event;
- }
-
- if (event && ctr_running)
- perf_event_enable(event);
-
- return 0;
-}
-
-static void nmi_timer_stop_cpu(int cpu)
-{
- struct perf_event *event = per_cpu(nmi_timer_events, cpu);
-
- if (event && ctr_running)
- perf_event_disable(event);
-}
-
-static int nmi_timer_cpu_online(unsigned int cpu)
-{
- nmi_timer_start_cpu(cpu);
- return 0;
-}
-static int nmi_timer_cpu_predown(unsigned int cpu)
-{
- nmi_timer_stop_cpu(cpu);
- return 0;
-}
-
-static int nmi_timer_start(void)
-{
- int cpu;
-
- get_online_cpus();
- ctr_running = 1;
- for_each_online_cpu(cpu)
- nmi_timer_start_cpu(cpu);
- put_online_cpus();
-
- return 0;
-}
-
-static void nmi_timer_stop(void)
-{
- int cpu;
-
- get_online_cpus();
- for_each_online_cpu(cpu)
- nmi_timer_stop_cpu(cpu);
- ctr_running = 0;
- put_online_cpus();
-}
-
-static enum cpuhp_state hp_online;
-
-static void nmi_timer_shutdown(void)
-{
- struct perf_event *event;
- int cpu;
-
- cpuhp_remove_state(hp_online);
- for_each_possible_cpu(cpu) {
- event = per_cpu(nmi_timer_events, cpu);
- if (!event)
- continue;
- perf_event_disable(event);
- per_cpu(nmi_timer_events, cpu) = NULL;
- perf_event_release_kernel(event);
- }
-}
-
-static int nmi_timer_setup(void)
-{
- int err;
- u64 period;
-
- /* clock cycles per tick: */
- period = (u64)cpu_khz * 1000;
- do_div(period, HZ);
- nmi_timer_attr.sample_period = period;
-
- err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "oprofile/nmi:online",
- nmi_timer_cpu_online, nmi_timer_cpu_predown);
- if (err < 0) {
- nmi_timer_shutdown();
- return err;
- }
- hp_online = err;
- return 0;
-}
-
-int __init op_nmi_timer_init(struct oprofile_operations *ops)
-{
- int err = 0;
-
- err = nmi_timer_setup();
- if (err)
- return err;
- nmi_timer_shutdown(); /* only check, don't alloc */
-
- ops->create_files = NULL;
- ops->setup = nmi_timer_setup;
- ops->shutdown = nmi_timer_shutdown;
- ops->start = nmi_timer_start;
- ops->stop = nmi_timer_stop;
- ops->cpu_type = "timer";
-
- printk(KERN_INFO "oprofile: using NMI timer interrupt.\n");
-
- return 0;
-}
-
-#endif
diff --git a/drivers/oprofile/oprof.c b/drivers/oprofile/oprof.c
deleted file mode 100644
index ed2c3ec07024..000000000000
--- a/drivers/oprofile/oprof.c
+++ /dev/null
@@ -1,286 +0,0 @@
-/**
- * @file oprof.c
- *
- * @remark Copyright 2002 OProfile authors
- * @remark Read the file COPYING
- *
- * @author John Levon <le...@mo...>
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/oprofile.h>
-#include <linux/moduleparam.h>
-#include <linux/workqueue.h>
-#include <linux/time.h>
-#include <linux/mutex.h>
-
-#include "oprof.h"
-#include "event_buffer.h"
-#include "cpu_buffer.h"
-#include "buffer_sync.h"
-#include "oprofile_stats.h"
-
-struct oprofile_operations oprofile_ops;
-
-unsigned long oprofile_started;
-unsigned long oprofile_backtrace_depth;
-static unsigned long is_setup;
-static DEFINE_MUTEX(start_mutex);
-
-/* timer
- 0 - use performance monitoring hardware if available
- 1 - use the timer int mechanism regardless
- */
-static int timer = 0;
-
-int oprofile_setup(void)
-{
- int err;
-
- mutex_lock(&start_mutex);
-
- if ((err = alloc_cpu_buffers()))
- goto out;
-
- if ((err = alloc_event_buffer()))
- goto out1;
-
- if (oprofile_ops.setup && (err = oprofile_ops.setup()))
- goto out2;
-
- /* Note even though this starts part of the
- * profiling overhead, it's necessary to prevent
- * us missing task deaths and eventually oopsing
- * when trying to process the event buffer.
- */
- if (oprofile_ops.sync_start) {
- int sync_ret = oprofile_ops.sync_start();
- switch (sync_ret) {
- case 0:
- goto post_sync;
- case 1:
- goto do_generic;
- case -1:
- goto out3;
- default:
- goto out3;
- }
- }
-do_generic:
- if ((err = sync_start()))
- goto out3;
-
-post_sync:
- is_setup = 1;
- mutex_unlock(&start_mutex);
- return 0;
-
-out3:
- if (oprofile_ops.shutdown)
- oprofile_ops.shutdown();
-out2:
- free_event_buffer();
-out1:
- free_cpu_buffers();
-out:
- mutex_unlock(&start_mutex);
- return err;
-}
-
-#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
-
-static void switch_worker(struct work_struct *work);
-static DECLARE_DELAYED_WORK(switch_work, switch_worker);
-
-static void start_switch_worker(void)
-{
- if (oprofile_ops.switch_events)
- schedule_delayed_work(&switch_work, oprofile_time_slice);
-}
-
-static void stop_switch_worker(void)
-{
- cancel_delayed_work_sync(&switch_work);
-}
-
-static void switch_worker(struct work_struct *work)
-{
- if (oprofile_ops.switch_events())
- return;
-
- atomic_inc(&oprofile_stats.multiplex_counter);
- start_switch_worker();
-}
-
-/* User inputs in ms, converts to jiffies */
-int oprofile_set_timeout(unsigned long val_msec)
-{
- int err = 0;
- unsigned long time_slice;
-
- mutex_lock(&start_mutex);
-
- if (oprofile_started) {
- err = -EBUSY;
- goto out;
- }
-
- if (!oprofile_ops.switch_events) {
- err = -EINVAL;
- goto out;
- }
-
- time_slice = msecs_to_jiffies(val_msec);
- if (time_slice == MAX_JIFFY_OFFSET) {
- err = -EINVAL;
- goto out;
- }
-
- oprofile_time_slice = time_slice;
-
-out:
- mutex_unlock(&start_mutex);
- return err;
-
-}
-
-#else
-
-static inline void start_switch_worker(void) { }
-static inline void stop_switch_worker(void) { }
-
-#endif
-
-/* Actually start profiling (echo 1>/dev/oprofile/enable) */
-int oprofile_start(void)
-{
- int err = -EINVAL;
-
- mutex_lock(&start_mutex);
-
- if (!is_setup)
- goto out;
-
- err = 0;
-
- if (oprofile_started)
- goto out;
-
- oprofile_reset_stats();
-
- if ((err = oprofile_ops.start()))
- goto out;
-
- start_switch_worker();
-
- oprofile_started = 1;
-out:
- mutex_unlock(&start_mutex);
- return err;
-}
-
-
-/* echo 0>/dev/oprofile/enable */
-void oprofile_stop(void)
-{
- mutex_lock(&start_mutex);
- if (!oprofile_started)
- goto out;
- oprofile_ops.stop();
- oprofile_started = 0;
-
- stop_switch_worker();
-
- /* wake up the daemon to read what remains */
- wake_up_buffer_waiter();
-out:
- mutex_unlock(&start_mutex);
-}
-
-
-void oprofile_shutdown(void)
-{
- mutex_lock(&start_mutex);
- if (oprofile_ops.sync_stop) {
- int sync_ret = oprofile_ops.sync_stop();
- switch (sync_ret) {
- case 0:
- goto post_sync;
- case 1:
- goto do_generic;
- default:
- goto post_sync;
- }
- }
-do_generic:
- sync_stop();
-post_sync:
- if (oprofile_ops.shutdown)
- oprofile_ops.shutdown();
- is_setup = 0;
- free_event_buffer();
- free_cpu_buffers();
- mutex_unlock(&start_mutex);
-}
-
-int oprofile_set_ulong(unsigned long *addr, unsigned long val)
-{
- int err = -EBUSY;
-
- mutex_lock(&start_mutex);
- if (!oprofile_started) {
- *addr = val;
- err = 0;
- }
- mutex_unlock(&start_mutex);
-
- return err;
-}
-
-static int timer_mode;
-
-static int __init oprofile_init(void)
-{
- int err;
-
- /* always init architecture to setup backtrace support */
- timer_mode = 0;
- err = oprofile_arch_init(&oprofile_ops);
- if (!err) {
- if (!timer && !oprofilefs_register())
- return 0;
- oprofile_arch_exit();
- }
-
- /* setup timer mode: */
- timer_mode = 1;
- /* no nmi timer mode if oprofile.timer is set */
- if (timer || op_nmi_timer_init(&oprofile_ops)) {
- err = oprofile_timer_init(&oprofile_ops);
- if (err)
- return err;
- }
-
- return oprofilefs_register();
-}
-
-
-static void __exit oprofile_exit(void)
-{
- oprofilefs_unregister();
- if (!timer_mode)
- oprofile_arch_exit();
-}
-
-
-module_init(oprofile_init);
-module_exit(oprofile_exit);
-
-module_param_named(timer, timer, int, 0644);
-MODULE_PARM_DESC(timer, "force use of timer interrupt");
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("John Levon <le...@mo...>");
-MODULE_DESCRIPTION("OProfile system profiler");
diff --git a/drivers/oprofile/oprof.h b/drivers/oprofile/oprof.h
deleted file mode 100644
index d5412060ab0f..000000000000
--- a/drivers/oprofile/oprof.h
+++ /dev/null
@@ -1,50 +0,0 @@
-/**
- * @file oprof.h
- *
- * @remark Copyright 2002 OProfile authors
- * @remark Read the file COPYING
- *
- * @author John Levon <le...@mo...>
- */
-
-#ifndef OPROF_H
-#define OPROF_H
-
-int oprofile_setup(void);
-void oprofile_shutdown(void);
-
-int oprofilefs_register(void);
-void oprofilefs_unregister(void);
-
-int oprofile_start(void);
-void oprofile_stop(void);
-
-struct oprofile_operations;
-
-extern unsigned long oprofile_buffer_size;
-extern unsigned long oprofile_cpu_buffer_size;
-extern unsigned long oprofile_buffer_watershed;
-extern unsigned long oprofile_time_slice;
-
-extern struct oprofile_operations oprofile_ops;
-extern unsigned long oprofile_started;
-extern unsigned long oprofile_backtrace_depth;
-
-struct dentry;
-
-void oprofile_create_files(struct dentry *root);
-int oprofile_timer_init(struct oprofile_operations *ops);
-#ifdef CONFIG_OPROFILE_NMI_TIMER
-int op_nmi_timer_init(struct oprofile_operations *ops);
-#else
-static inline int op_nmi_timer_init(struct oprofile_operations *ops)
-{
- return -ENODEV;
-}
-#endif
-
-
-int oprofile_set_ulong(unsigned long *addr, unsigned long val);
-int oprofile_set_timeout(unsigned long time);
-
-#endif /* OPROF_H */
diff --git a/drivers/oprofile/oprofile_files.c b/drivers/oprofile/oprofile_files.c
deleted file mode 100644
index ee2cfce358b9..000000000000
--- a/drivers/oprofile/oprofile_files.c
+++ /dev/null
@@ -1,201 +0,0 @@
-/**
- * @file oprofile_files.c
- *
- * @remark Copyright 2002 OProfile authors
- * @remark Read the file COPYING
- *
- * @author John Levon <le...@mo...>
- */
-
-#include <linux/fs.h>
-#include <linux/oprofile.h>
-#include <linux/jiffies.h>
-
-#include "event_buffer.h"
-#include "oprofile_stats.h"
-#include "oprof.h"
-
-#define BUFFER_SIZE_DEFAULT 131072
-#define CPU_BUFFER_SIZE_DEFAULT 8192
-#define BUFFER_WATERSHED_DEFAULT 32768 /* FIXME: tune */
-#define TIME_SLICE_DEFAULT 1
-
-unsigned long oprofile_buffer_size;
-unsigned long oprofile_cpu_buffer_size;
-unsigned long oprofile_buffer_watershed;
-unsigned long oprofile_time_slice;
-
-#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
-
-static ssize_t timeout_read(struct file *file, char __user *buf,
- size_t count, loff_t *offset)
-{
- return oprofilefs_ulong_to_user(jiffies_to_msecs(oprofile_time_slice),
- buf, count, offset);
-}
-
-
-static ssize_t timeout_write(struct file *file, char const __user *buf,
- size_t count, loff_t *offset)
-{
- unsigned long val;
- int retval;
-
- if (*offset)
- return -EINVAL;
-
- retval = oprofilefs_ulong_from_user(&val, buf, count);
- if (retval <= 0)
- return retval;
-
- retval = oprofile_set_timeout(val);
-
- if (retval)
- return retval;
- return count;
-}
-
-
-static const struct file_operations timeout_fops = {
- .read = timeout_read,
- .write = timeout_write,
- .llseek = default_llseek,
-};
-
-#endif
-
-
-static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
-{
- return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count,
- offset);
-}
-
-
-static ssize_t depth_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
-{
- unsigned long val;
- int retval;
-
- if (*offset)
- return -EINVAL;
-
- if (!oprofile_ops.backtrace)
- return -EINVAL;
-
- retval = oprofilefs_ulong_from_user(&val, buf, count);
- if (retval <= 0)
- return retval;
-
- retval = oprofile_set_ulong(&oprofile_backtrace_depth, val);
- if (retval)
- return retval;
-
- return count;
-}
-
-
-static const struct file_operations depth_fops = {
- .read = depth_read,
- .write = depth_write,
- .llseek = default_llseek,
-};
-
-
-static ssize_t pointer_size_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
-{
- return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset);
-}
-
-
-static const struct file_operations pointer_size_fops = {
- .read = pointer_size_read,
- .llseek = default_llseek,
-};
-
-
-static ssize_t cpu_type_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
-{
- return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
-}
-
-
-static const struct file_operations cpu_type_fops = {
- .read = cpu_type_read,
- .llseek = default_llseek,
-};
-
-
-static ssize_t enable_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
-{
- return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset);
-}
-
-
-static ssize_t enable_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
-{
- unsigned long val;
- int retval;
-
- if (*offset)
- return -EINVAL;
-
- retval = oprofilefs_ulong_from_user(&val, buf, count);
- if (retval <= 0)
- return retval;
-
- retval = 0;
- if (val)
- retval = oprofile_start();
- else
- oprofile_stop();
-
- if (retval)
- return retval;
- return count;
-}
-
-
-static const struct file_operations enable_fops = {
- .read = enable_read,
- .write = enable_write,
- .llseek = default_llseek,
-};
-
-
-static ssize_t dump_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
-{
- wake_up_buffer_waiter();
- return count;
-}
-
-
-static const struct file_operations dump_fops = {
- .write = dump_write,
- .llseek = noop_llseek,
-};
-
-void oprofile_create_files(struct dentry *root)
-{
- /* reinitialize default values */
- oprofile_buffer_size = BUFFER_SIZE_DEFAULT;
- oprofile_cpu_buffer_size = CPU_BUFFER_SIZE_DEFAULT;
- oprofile_buffer_watershed = BUFFER_WATERSHED_DEFAULT;
- oprofile_time_slice = msecs_to_jiffies(TIME_SLICE_DEFAULT);
-
- oprofilefs_create_file(root, "enable", &enable_fops);
- ...
[truncated message content] |