Commit 32f98aab authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo

perf intel-pt/bts: Tidy instruction buffer size usage

Tidy instruction buffer size usage in preparation for copying the
instruction bytes onto samples.

The instruction buffer is presently used for debugging, so rename its
size macro from INTEL_PT_INSN_DBG_BUF_SZ to INTEL_PT_INSN_BUF_SZ, and
use it everywhere.

Note that the maximum instruction size is 15 which is a less efficient size
to copy than 16, which is why a separate buffer size is used.
Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1475847747-30994-2-git-send-email-adrian.hunter@intel.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent e9c84892
......@@ -319,15 +319,12 @@ static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
struct machine *machine = btsq->bts->machine;
struct thread *thread;
struct addr_location al;
unsigned char buf[1024];
size_t bufsz;
unsigned char buf[INTEL_PT_INSN_BUF_SZ];
ssize_t len;
int x86_64;
uint8_t cpumode;
int err = -1;
bufsz = intel_pt_insn_max_size();
if (machine__kernel_ip(machine, ip))
cpumode = PERF_RECORD_MISC_KERNEL;
else
......@@ -341,7 +338,8 @@ static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
if (!al.map || !al.map->dso)
goto out_put;
len = dso__data_read_addr(al.map->dso, al.map, machine, ip, buf, bufsz);
len = dso__data_read_addr(al.map->dso, al.map, machine, ip, buf,
INTEL_PT_INSN_BUF_SZ);
if (len <= 0)
goto out_put;
......
......@@ -27,6 +27,10 @@
#include "intel-pt-insn-decoder.h"
#if INTEL_PT_INSN_BUF_SZ < MAX_INSN_SIZE
#error Instruction buffer size too small
#endif
/* Based on branch_type() from perf_event_intel_lbr.c */
static void intel_pt_insn_decoder(struct insn *insn,
struct intel_pt_insn *intel_pt_insn)
......@@ -166,10 +170,10 @@ int intel_pt_get_insn(const unsigned char *buf, size_t len, int x86_64,
if (!insn_complete(&insn) || insn.length > len)
return -1;
intel_pt_insn_decoder(&insn, intel_pt_insn);
if (insn.length < INTEL_PT_INSN_DBG_BUF_SZ)
if (insn.length < INTEL_PT_INSN_BUF_SZ)
memcpy(intel_pt_insn->buf, buf, insn.length);
else
memcpy(intel_pt_insn->buf, buf, INTEL_PT_INSN_DBG_BUF_SZ);
memcpy(intel_pt_insn->buf, buf, INTEL_PT_INSN_BUF_SZ);
return 0;
}
......@@ -211,11 +215,6 @@ int intel_pt_insn_desc(const struct intel_pt_insn *intel_pt_insn, char *buf,
return 0;
}
size_t intel_pt_insn_max_size(void)
{
return MAX_INSN_SIZE;
}
int intel_pt_insn_type(enum intel_pt_insn_op op)
{
switch (op) {
......
......@@ -20,7 +20,7 @@
#include <stdint.h>
#define INTEL_PT_INSN_DESC_MAX 32
#define INTEL_PT_INSN_DBG_BUF_SZ 16
#define INTEL_PT_INSN_BUF_SZ 16
enum intel_pt_insn_op {
INTEL_PT_OP_OTHER,
......@@ -47,7 +47,7 @@ struct intel_pt_insn {
enum intel_pt_insn_branch branch;
int length;
int32_t rel;
unsigned char buf[INTEL_PT_INSN_DBG_BUF_SZ];
unsigned char buf[INTEL_PT_INSN_BUF_SZ];
};
int intel_pt_get_insn(const unsigned char *buf, size_t len, int x86_64,
......@@ -58,8 +58,6 @@ const char *intel_pt_insn_name(enum intel_pt_insn_op op);
int intel_pt_insn_desc(const struct intel_pt_insn *intel_pt_insn, char *buf,
size_t buf_len);
size_t intel_pt_insn_max_size(void);
int intel_pt_insn_type(enum intel_pt_insn_op op);
#endif
......@@ -119,8 +119,8 @@ void __intel_pt_log_insn(struct intel_pt_insn *intel_pt_insn, uint64_t ip)
if (intel_pt_log_open())
return;
if (len > INTEL_PT_INSN_DBG_BUF_SZ)
len = INTEL_PT_INSN_DBG_BUF_SZ;
if (len > INTEL_PT_INSN_BUF_SZ)
len = INTEL_PT_INSN_BUF_SZ;
intel_pt_print_data(intel_pt_insn->buf, len, ip, 8);
if (intel_pt_insn_desc(intel_pt_insn, desc, INTEL_PT_INSN_DESC_MAX) > 0)
fprintf(f, "%s\n", desc);
......
......@@ -428,8 +428,7 @@ static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn,
struct machine *machine = ptq->pt->machine;
struct thread *thread;
struct addr_location al;
unsigned char buf[1024];
size_t bufsz;
unsigned char buf[INTEL_PT_INSN_BUF_SZ];
ssize_t len;
int x86_64;
u8 cpumode;
......@@ -440,8 +439,6 @@ static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn,
if (to_ip && *ip == to_ip)
goto out_no_cache;
bufsz = intel_pt_insn_max_size();
if (*ip >= ptq->pt->kernel_start)
cpumode = PERF_RECORD_MISC_KERNEL;
else
......@@ -493,7 +490,8 @@ static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn,
while (1) {
len = dso__data_read_offset(al.map->dso, machine,
offset, buf, bufsz);
offset, buf,
INTEL_PT_INSN_BUF_SZ);
if (len <= 0)
return -EINVAL;
......
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