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Re: [PATCH 17/18] drivers: Remove CONFIG_OPROFILE support
|
From: Paul E. M. <pa...@ke...> - 2021-01-14 15:24:43
|
On Thu, Jan 14, 2021 at 05:05:30PM +0530, Viresh Kumar wrote:
> 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...>
For the RCU update:
Acked-by: Paul E. McKenney <pa...@ke...>
> ---
> 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
> -
> -...
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