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x86, bts: cleanups
Impact: cleanup, no code changed Cc: Markus Metzger <markus.t.metzger@intel.com> LKML-Reference: <20090313104218.A30096@sedona.ch.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
parent
321bb5e1ac
commit
e9a22d1fb9
4 changed files with 88 additions and 69 deletions
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@ -19,43 +19,52 @@
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* Markus Metzger <markus.t.metzger@intel.com>, 2007-2009
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <asm/ds.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include "ds_selftest.h"
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/*
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* The configuration for a particular DS hardware implementation.
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* The configuration for a particular DS hardware implementation:
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*/
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struct ds_configuration {
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/* The name of the configuration. */
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const char *name;
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/* The size of pointer-typed fields in DS, BTS, and PEBS. */
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unsigned char sizeof_ptr_field;
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/* The size of a BTS/PEBS record in bytes. */
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unsigned char sizeof_rec[2];
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/* Control bit-masks indexed by enum ds_feature. */
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unsigned long ctl[dsf_ctl_max];
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/* The name of the configuration: */
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const char *name;
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/* The size of pointer-typed fields in DS, BTS, and PEBS: */
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unsigned char sizeof_ptr_field;
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/* The size of a BTS/PEBS record in bytes: */
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unsigned char sizeof_rec[2];
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/* Control bit-masks indexed by enum ds_feature: */
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unsigned long ctl[dsf_ctl_max];
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};
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static DEFINE_PER_CPU(struct ds_configuration, ds_cfg_array);
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#define ds_cfg per_cpu(ds_cfg_array, smp_processor_id())
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#define MAX_SIZEOF_DS (12 * 8) /* Maximal size of a DS configuration. */
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#define MAX_SIZEOF_BTS (3 * 8) /* Maximal size of a BTS record. */
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#define DS_ALIGNMENT (1 << 3) /* BTS and PEBS buffer alignment. */
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/* Maximal size of a DS configuration: */
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#define MAX_SIZEOF_DS (12 * 8)
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#define BTS_CONTROL \
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(ds_cfg.ctl[dsf_bts] | ds_cfg.ctl[dsf_bts_kernel] | ds_cfg.ctl[dsf_bts_user] |\
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ds_cfg.ctl[dsf_bts_overflow])
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/* Maximal size of a BTS record: */
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#define MAX_SIZEOF_BTS (3 * 8)
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/* BTS and PEBS buffer alignment: */
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#define DS_ALIGNMENT (1 << 3)
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/* Mask of control bits in the DS MSR register: */
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#define BTS_CONTROL \
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( ds_cfg.ctl[dsf_bts] | \
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ds_cfg.ctl[dsf_bts_kernel] | \
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ds_cfg.ctl[dsf_bts_user] | \
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ds_cfg.ctl[dsf_bts_overflow] )
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/*
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* A BTS or PEBS tracer.
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@ -65,28 +74,32 @@ static DEFINE_PER_CPU(struct ds_configuration, ds_cfg_array);
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*/
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struct ds_tracer {
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/* The DS context (partially) owned by this tracer. */
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struct ds_context *context;
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struct ds_context *context;
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/* The buffer provided on ds_request() and its size in bytes. */
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void *buffer;
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size_t size;
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void *buffer;
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size_t size;
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};
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struct bts_tracer {
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/* The common DS part. */
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struct ds_tracer ds;
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/* The trace including the DS configuration. */
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struct bts_trace trace;
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/* Buffer overflow notification function. */
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bts_ovfl_callback_t ovfl;
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/* The common DS part: */
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struct ds_tracer ds;
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/* The trace including the DS configuration: */
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struct bts_trace trace;
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/* Buffer overflow notification function: */
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bts_ovfl_callback_t ovfl;
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};
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struct pebs_tracer {
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/* The common DS part. */
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struct ds_tracer ds;
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/* The trace including the DS configuration. */
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struct pebs_trace trace;
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/* Buffer overflow notification function. */
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pebs_ovfl_callback_t ovfl;
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/* The common DS part: */
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struct ds_tracer ds;
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/* The trace including the DS configuration: */
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struct pebs_trace trace;
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/* Buffer overflow notification function: */
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pebs_ovfl_callback_t ovfl;
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};
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/*
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@ -95,6 +108,7 @@ struct pebs_tracer {
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*
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* The DS configuration consists of the following fields; different
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* architetures vary in the size of those fields.
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*
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* - double-word aligned base linear address of the BTS buffer
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* - write pointer into the BTS buffer
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* - end linear address of the BTS buffer (one byte beyond the end of
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@ -133,19 +147,20 @@ enum ds_field {
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};
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enum ds_qualifier {
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ds_bts = 0,
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ds_bts = 0,
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ds_pebs
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};
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static inline unsigned long ds_get(const unsigned char *base,
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enum ds_qualifier qual, enum ds_field field)
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static inline unsigned long
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ds_get(const unsigned char *base, enum ds_qualifier qual, enum ds_field field)
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{
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base += (ds_cfg.sizeof_ptr_field * (field + (4 * qual)));
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return *(unsigned long *)base;
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}
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static inline void ds_set(unsigned char *base, enum ds_qualifier qual,
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enum ds_field field, unsigned long value)
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static inline void
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ds_set(unsigned char *base, enum ds_qualifier qual, enum ds_field field,
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unsigned long value)
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{
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base += (ds_cfg.sizeof_ptr_field * (field + (4 * qual)));
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(*(unsigned long *)base) = value;
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@ -157,7 +172,6 @@ static inline void ds_set(unsigned char *base, enum ds_qualifier qual,
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*/
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static DEFINE_SPINLOCK(ds_lock);
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/*
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* We either support (system-wide) per-cpu or per-thread allocation.
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* We distinguish the two based on the task_struct pointer, where a
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@ -211,17 +225,21 @@ static inline int check_tracer(struct task_struct *task)
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* deallocated when the last user puts the context.
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*/
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struct ds_context {
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/* The DS configuration; goes into MSR_IA32_DS_AREA. */
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unsigned char ds[MAX_SIZEOF_DS];
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/* The owner of the BTS and PEBS configuration, respectively. */
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struct bts_tracer *bts_master;
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struct pebs_tracer *pebs_master;
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/* Use count. */
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/* The DS configuration; goes into MSR_IA32_DS_AREA: */
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unsigned char ds[MAX_SIZEOF_DS];
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/* The owner of the BTS and PEBS configuration, respectively: */
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struct bts_tracer *bts_master;
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struct pebs_tracer *pebs_master;
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/* Use count: */
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unsigned long count;
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/* Pointer to the context pointer field. */
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struct ds_context **this;
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/* The traced task; NULL for current cpu. */
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struct task_struct *task;
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/* Pointer to the context pointer field: */
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struct ds_context **this;
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/* The traced task; NULL for current cpu: */
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struct task_struct *task;
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};
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static DEFINE_PER_CPU(struct ds_context *, system_context_array);
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@ -328,9 +346,9 @@ static void ds_overflow(struct ds_context *context, enum ds_qualifier qual)
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* The remainder of any partially written record is zeroed out.
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*
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* context: the DS context
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* qual: the buffer type
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* record: the data to write
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* size: the size of the data
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* qual: the buffer type
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* record: the data to write
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* size: the size of the data
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*/
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static int ds_write(struct ds_context *context, enum ds_qualifier qual,
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const void *record, size_t size)
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@ -429,12 +447,12 @@ enum bts_field {
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bts_to,
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bts_flags,
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bts_qual = bts_from,
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bts_jiffies = bts_to,
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bts_pid = bts_flags,
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bts_qual = bts_from,
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bts_jiffies = bts_to,
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bts_pid = bts_flags,
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bts_qual_mask = (bts_qual_max - 1),
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bts_escape = ((unsigned long)-1 & ~bts_qual_mask)
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bts_qual_mask = (bts_qual_max - 1),
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bts_escape = ((unsigned long)-1 & ~bts_qual_mask)
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};
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static inline unsigned long bts_get(const char *base, enum bts_field field)
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@ -461,8 +479,8 @@ static inline void bts_set(char *base, enum bts_field field, unsigned long val)
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*
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* return: bytes read/written on success; -Eerrno, otherwise
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*/
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static int bts_read(struct bts_tracer *tracer, const void *at,
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struct bts_struct *out)
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static int
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bts_read(struct bts_tracer *tracer, const void *at, struct bts_struct *out)
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{
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if (!tracer)
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return -EINVAL;
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@ -12,4 +12,4 @@ extern int ds_selftest_pebs(void);
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#else
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static inline int ds_selftest_bts(void) { return 0; }
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static inline int ds_selftest_pebs(void) { return 0; }
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#endif /* CONFIG_X86_DS_SELFTEST */
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#endif
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@ -1,5 +1,5 @@
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/*
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* h/w branch tracer for x86 based on bts
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* h/w branch tracer for x86 based on BTS
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*
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* Copyright (C) 2008-2009 Intel Corporation.
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* Markus Metzger <markus.t.metzger@gmail.com>, 2008-2009
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@ -15,8 +15,8 @@
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#include <asm/ds.h>
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#include "trace.h"
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#include "trace_output.h"
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#include "trace.h"
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#define BTS_BUFFER_SIZE (1 << 13)
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@ -197,10 +197,10 @@ static void bts_trace_print_header(struct seq_file *m)
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static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
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{
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unsigned long symflags = TRACE_ITER_SYM_OFFSET;
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struct trace_entry *entry = iter->ent;
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struct trace_seq *seq = &iter->seq;
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struct hw_branch_entry *it;
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unsigned long symflags = TRACE_ITER_SYM_OFFSET;
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trace_assign_type(it, entry);
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@ -189,6 +189,7 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
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#else
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# define trace_selftest_startup_dynamic_tracing(trace, tr, func) ({ 0; })
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#endif /* CONFIG_DYNAMIC_FTRACE */
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/*
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* Simple verification test of ftrace function tracer.
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* Enable ftrace, sleep 1/10 second, and then read the trace
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@ -698,10 +699,10 @@ int
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trace_selftest_startup_hw_branches(struct tracer *trace,
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struct trace_array *tr)
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{
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unsigned long count;
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int ret;
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struct trace_iterator iter;
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struct tracer tracer;
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unsigned long count;
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int ret;
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if (!trace->open) {
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printk(KERN_CONT "missing open function...");
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