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Commit 4ab241d2 authored by Stéphane Eranian's avatar Stéphane Eranian Committed by David Mosberger
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[PATCH] ia64: perfmon update 

        - fix bug in pfm_unload(), not allowed when not on correct CPU for
          system-wide
        - some perf/cleanup in overflow handler
        - fix reset_pmds to be on a per PMD basis on counter overflow rather
          than global
        - remove timing debug code on messages
        - no kernel info leak on PFM_END_MSG
        - remove double-store on reg_flags for pfm_write_pmcs, pfm_write_pmds
        - on restart reset_pmds is 0 by default
        - cleanup useless macros
        - cleanup some debug prints
        - added ability to remove debug code
        - streamlined sys_perfmonctl(), pfm_read_pmds(), pfm_write_*()
        - added current->tgid to default format sample header by using one
          reserved field
parent 9fe55b95
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Showing with 183 additions and 179 deletions
arch/ia64/kernel/perfmon.c
View file @ 4ab241d2
......@@ -82,7 +82,7 @@
#define PFM_REG_IMPL 0x1 /* register implemented */
#define PFM_REG_END 0x2 /* end marker */
#define PFM_REG_MONITOR (0x1<<4|PFM_REG_IMPL) /* a PMC with a pmc.pm field only */
#define PFM_REG_COUNTING (0x2<<4|PFM_REG_MONITOR|PFM_REG_IMPL) /* a monitor + pmc.oi+ PMD used as a counter */
#define PFM_REG_COUNTING (0x2<<4|PFM_REG_MONITOR) /* a monitor + pmc.oi+ PMD used as a counter */
#define PFM_REG_CONTROL (0x4<<4|PFM_REG_IMPL) /* PMU control register */
#define PFM_REG_CONFIG (0x8<<4|PFM_REG_IMPL) /* configuration register */
#define PFM_REG_BUFFER (0xc<<4|PFM_REG_IMPL) /* PMD used as buffer */
......@@ -109,14 +109,15 @@
#define PMD_PMD_DEP(i) pmu_conf.pmd_desc[i].dep_pmd[0]
#define PMC_PMD_DEP(i) pmu_conf.pmc_desc[i].dep_pmd[0]
/* k assumed unsigned (up to 64 registers) */
#define IBR_IS_IMPL(k) (k< IA64_NUM_DBG_REGS)
#define DBR_IS_IMPL(k) (k< IA64_NUM_DBG_REGS)
#define PFM_NUM_IBRS IA64_NUM_DBG_REGS
#define PFM_NUM_DBRS IA64_NUM_DBG_REGS
#define CTX_OVFL_NOBLOCK(c) ((c)->ctx_fl_block == 0)
#define CTX_HAS_SMPL(c) ((c)->ctx_fl_is_sampling)
#define PFM_CTX_TASK(h) (h)->ctx_task
#define PMU_PMC_OI 5 /* position of pmc.oi bit */
/* XXX: does not support more than 64 PMDs */
#define CTX_USED_PMD(ctx, mask) (ctx)->ctx_used_pmds[0] |= (mask)
#define CTX_IS_USED_PMD(ctx, c) (((ctx)->ctx_used_pmds[0] & (1UL << (c))) != 0UL)
......@@ -218,6 +219,8 @@
/*
* debugging
*/
#define PFM_DEBUGGING 1
#ifdef PFM_DEBUGGING
#define DPRINT(a) \
do { \
if (unlikely(pfm_sysctl.debug >0)) { printk("%s.%d: CPU%d [%d] ", __FUNCTION__, __LINE__, smp_processor_id(), current->pid); printk a; } \
......@@ -227,18 +230,7 @@
do { \
if (unlikely(pfm_sysctl.debug > 0 && pfm_sysctl.debug_ovfl >0)) { printk("%s.%d: CPU%d [%d] ", __FUNCTION__, __LINE__, smp_processor_id(), current->pid); printk a; } \
} while (0)
/*
* Architected PMC structure
*/
typedef struct {
unsigned long pmc_plm:4; /* privilege level mask */
unsigned long pmc_ev:1; /* external visibility */
unsigned long pmc_oi:1; /* overflow interrupt */
unsigned long pmc_pm:1; /* privileged monitor */
unsigned long pmc_ig1:1; /* reserved */
unsigned long pmc_es:8; /* event select */
unsigned long pmc_ig2:48; /* reserved */
} pfm_monitor_t;
#endif
/*
* 64-bit software counter structure
......@@ -469,20 +461,13 @@ typedef struct {
#define PFM_CMD_STOP 0x08 /* command does not work on zombie context */
#define PFM_CMD_IDX(cmd) (cmd)
#define PFM_CMD_IS_VALID(cmd) ((PFM_CMD_IDX(cmd) >= 0) && (PFM_CMD_IDX(cmd) < PFM_CMD_COUNT) \
&& pfm_cmd_tab[PFM_CMD_IDX(cmd)].cmd_func != NULL)
#define PFM_CMD_NAME(cmd) pfm_cmd_tab[PFM_CMD_IDX(cmd)].cmd_name
#define PFM_CMD_READ_ARG(cmd) (pfm_cmd_tab[PFM_CMD_IDX(cmd)].cmd_flags & PFM_CMD_ARG_READ)
#define PFM_CMD_RW_ARG(cmd) (pfm_cmd_tab[PFM_CMD_IDX(cmd)].cmd_flags & PFM_CMD_ARG_RW)
#define PFM_CMD_USE_FD(cmd) (pfm_cmd_tab[PFM_CMD_IDX(cmd)].cmd_flags & PFM_CMD_FD)
#define PFM_CMD_STOPPED(cmd) (pfm_cmd_tab[PFM_CMD_IDX(cmd)].cmd_flags & PFM_CMD_STOP)
#define PFM_CMD_NAME(cmd) pfm_cmd_tab[(cmd)].cmd_name
#define PFM_CMD_READ_ARG(cmd) (pfm_cmd_tab[(cmd)].cmd_flags & PFM_CMD_ARG_READ)
#define PFM_CMD_RW_ARG(cmd) (pfm_cmd_tab[(cmd)].cmd_flags & PFM_CMD_ARG_RW)
#define PFM_CMD_USE_FD(cmd) (pfm_cmd_tab[(cmd)].cmd_flags & PFM_CMD_FD)
#define PFM_CMD_STOPPED(cmd) (pfm_cmd_tab[(cmd)].cmd_flags & PFM_CMD_STOP)
#define PFM_CMD_ARG_MANY -1 /* cannot be zero */
#define PFM_CMD_NARG(cmd) (pfm_cmd_tab[PFM_CMD_IDX(cmd)].cmd_narg)
#define PFM_CMD_ARG_SIZE(cmd) (pfm_cmd_tab[PFM_CMD_IDX(cmd)].cmd_argsize)
#define PFM_CMD_GETSIZE(cmd) (pfm_cmd_tab[PFM_CMD_IDX(cmd)].cmd_getsize)
typedef struct {
int debug; /* turn on/off debugging via syslog */
......@@ -2834,10 +2819,11 @@ static int
pfm_write_pmcs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
{
struct thread_struct *thread = NULL;
struct task_struct *task;
pfarg_reg_t *req = (pfarg_reg_t *)arg;
unsigned long value;
unsigned long smpl_pmds, reset_pmds;
unsigned int cnum, reg_flags, flags;
unsigned long value, pmc_pm;
unsigned long smpl_pmds, reset_pmds, impl_pmds;
unsigned int cnum, reg_flags, flags, pmc_type;
int i, can_access_pmu = 0, is_loaded, is_system;
int is_monitor, is_counting, state;
int ret = -EINVAL;
......@@ -2846,12 +2832,13 @@ pfm_write_pmcs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
state = ctx->ctx_state;
is_loaded = state == PFM_CTX_LOADED ? 1 : 0;
is_system = ctx->ctx_fl_system;
task = ctx->ctx_task;
impl_pmds = pmu_conf.impl_pmds[0];
if (state == PFM_CTX_TERMINATED || state == PFM_CTX_ZOMBIE) return -EINVAL;
if (is_loaded) {
thread = &ctx->ctx_task->thread;
thread = &task->thread;
/*
* In system wide and when the context is loaded, access can only happen
* when the caller is running on the CPU being monitored by the session.
......@@ -2861,7 +2848,7 @@ pfm_write_pmcs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
DPRINT(("[%d] should be running on CPU%d\n", current->pid, ctx->ctx_cpu));
return -EBUSY;
}
can_access_pmu = GET_PMU_OWNER() == ctx->ctx_task || is_system ? 1 : 0;
can_access_pmu = GET_PMU_OWNER() == task || is_system ? 1 : 0;
}
for (i = 0; i < count; i++, req++) {
......@@ -2873,16 +2860,24 @@ pfm_write_pmcs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
reset_pmds = req->reg_reset_pmds[0];
flags = 0;
is_counting = PMC_IS_COUNTING(cnum);
is_monitor = PMC_IS_MONITOR(cnum);
if (cnum >= PMU_MAX_PMCS) {
DPRINT(("pmc%u is invalid\n", cnum));
goto error;
}
pmc_type = pmu_conf.pmc_desc[cnum].type;
pmc_pm = (value >> pmu_conf.pmc_desc[cnum].pm_pos) & 0x1;
is_counting = (pmc_type & PFM_REG_COUNTING) == PFM_REG_COUNTING ? 1 : 0;
is_monitor = (pmc_type & PFM_REG_MONITOR) == PFM_REG_MONITOR ? 1 : 0;
/*
* we reject all non implemented PMC as well
* as attempts to modify PMC[0-3] which are used
* as status registers by the PMU
*/
if (PMC_IS_IMPL(cnum) == 0 || PMC_IS_CONTROL(cnum)) {
DPRINT(("pmc%u is unimplemented or invalid\n", cnum));
if ((pmc_type & PFM_REG_IMPL) == 0 || (pmc_type & PFM_REG_CONTROL) == PFM_REG_CONTROL) {
DPRINT(("pmc%u is unimplemented or no-access pmc_type=%x\n", cnum, pmc_type));
goto error;
}
/*
......@@ -2890,21 +2885,20 @@ pfm_write_pmcs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
* - system-wide session: PMCx.pm=1 (privileged monitor)
* - per-task : PMCx.pm=0 (user monitor)
*/
if ((is_monitor || is_counting) && value != PMC_DFL_VAL(cnum) && PFM_CHECK_PMC_PM(ctx, cnum, value)) {
DPRINT(("pmc%u pmc_pm=%ld fl_system=%d\n",
if (is_monitor && value != PMC_DFL_VAL(cnum) && is_system ^ pmc_pm) {
DPRINT(("pmc%u pmc_pm=%lu is_system=%d\n",
cnum,
PMC_PM(cnum, value),
ctx->ctx_fl_system));
pmc_pm,
is_system));
goto error;
}
if (is_counting) {
pfm_monitor_t *p = (pfm_monitor_t *)&value;
/*
* enforce generation of overflow interrupt. Necessary on all
* CPUs.
*/
p->pmc_oi = 1;
value |= 1 << PMU_PMC_OI;
if (reg_flags & PFM_REGFL_OVFL_NOTIFY) {
flags |= PFM_REGFL_OVFL_NOTIFY;
......@@ -2913,13 +2907,13 @@ pfm_write_pmcs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
if (reg_flags & PFM_REGFL_RANDOM) flags |= PFM_REGFL_RANDOM;
/* verify validity of smpl_pmds */
if ((smpl_pmds & pmu_conf.impl_pmds[0]) != smpl_pmds) {
if ((smpl_pmds & impl_pmds) != smpl_pmds) {
DPRINT(("invalid smpl_pmds 0x%lx for pmc%u\n", smpl_pmds, cnum));
goto error;
}
/* verify validity of reset_pmds */
if ((reset_pmds & pmu_conf.impl_pmds[0]) != reset_pmds) {
if ((reset_pmds & impl_pmds) != reset_pmds) {
DPRINT(("invalid reset_pmds 0x%lx for pmc%u\n", reset_pmds, cnum));
goto error;
}
......@@ -2935,7 +2929,7 @@ pfm_write_pmcs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
* execute write checker, if any
*/
if (PMC_WR_FUNC(cnum)) {
ret = PMC_WR_FUNC(cnum)(ctx->ctx_task, ctx, cnum, &value, regs);
ret = PMC_WR_FUNC(cnum)(task, ctx, cnum, &value, regs);
if (ret) goto error;
ret = -EINVAL;
}
......@@ -2997,7 +2991,7 @@ pfm_write_pmcs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
*
* The value in ctx_pmcs[] can only be changed in pfm_write_pmcs().
*
* The value in t->pmc[] may be modified on overflow, i.e., when
* The value in thread->pmcs[] may be modified on overflow, i.e., when
* monitoring needs to be stopped.
*/
if (is_monitor) CTX_USED_MONITOR(ctx, 1UL << cnum);
......@@ -3056,11 +3050,6 @@ pfm_write_pmcs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
return 0;
error:
PFM_REG_RETFLAG_SET(req->reg_flags, PFM_REG_RETFL_EINVAL);
req->reg_flags = PFM_REG_RETFL_EINVAL;
DPRINT(("pmc[%u]=0x%lx error %d\n", cnum, value, ret));
return ret;
}
......@@ -3068,6 +3057,7 @@ static int
pfm_write_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
{
struct thread_struct *thread = NULL;
struct task_struct *task;
pfarg_reg_t *req = (pfarg_reg_t *)arg;
unsigned long value, hw_value, ovfl_mask;
unsigned int cnum;
......@@ -3080,25 +3070,26 @@ pfm_write_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
is_loaded = state == PFM_CTX_LOADED ? 1 : 0;
is_system = ctx->ctx_fl_system;
ovfl_mask = pmu_conf.ovfl_val;
task = ctx->ctx_task;
if (state == PFM_CTX_TERMINATED || state == PFM_CTX_ZOMBIE) return -EINVAL;
if (unlikely(state == PFM_CTX_TERMINATED || state == PFM_CTX_ZOMBIE)) return -EINVAL;
/*
* on both UP and SMP, we can only write to the PMC when the task is
* the owner of the local PMU.
*/
if (is_loaded) {
thread = &ctx->ctx_task->thread;
if (likely(is_loaded)) {
thread = &task->thread;
/*
* In system wide and when the context is loaded, access can only happen
* when the caller is running on the CPU being monitored by the session.
* It does not have to be the owner (ctx_task) of the context per se.
*/
if (is_system && ctx->ctx_cpu != smp_processor_id()) {
if (unlikely(is_system && ctx->ctx_cpu != smp_processor_id())) {
DPRINT(("[%d] should be running on CPU%d\n", current->pid, ctx->ctx_cpu));
return -EBUSY;
}
can_access_pmu = GET_PMU_OWNER() == ctx->ctx_task || is_system ? 1 : 0;
can_access_pmu = GET_PMU_OWNER() == task || is_system ? 1 : 0;
}
for (i = 0; i < count; i++, req++) {
......@@ -3118,7 +3109,7 @@ pfm_write_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
if (PMD_WR_FUNC(cnum)) {
unsigned long v = value;
ret = PMD_WR_FUNC(cnum)(ctx->ctx_task, ctx, cnum, &v, regs);
ret = PMD_WR_FUNC(cnum)(task, ctx, cnum, &v, regs);
if (ret) goto abort_mission;
value = v;
......@@ -3243,16 +3234,6 @@ pfm_write_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
* for now, we have only one possibility for error
*/
PFM_REG_RETFLAG_SET(req->reg_flags, PFM_REG_RETFL_EINVAL);
/*
* we change the return value to EFAULT in case we cannot write register return code.
* The caller first must correct this error, then a resubmission of the request will
* eventually yield the EINVAL.
*/
req->reg_flags = PFM_REG_RETFL_EINVAL;
DPRINT(("pmd[%u]=0x%lx ret %d\n", cnum, value, ret));
return ret;
}
......@@ -3269,11 +3250,12 @@ static int
pfm_read_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
{
struct thread_struct *thread = NULL;
unsigned long val = 0UL, lval, ovfl_mask;
struct task_struct *task;
unsigned long val = 0UL, lval, ovfl_mask, sval;
pfarg_reg_t *req = (pfarg_reg_t *)arg;
unsigned int cnum, reg_flags = 0;
int i, can_access_pmu = 0, state;
int is_loaded, is_system;
int is_loaded, is_system, is_counting;
int ret = -EINVAL;
/*
......@@ -3285,32 +3267,33 @@ pfm_read_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
is_loaded = state == PFM_CTX_LOADED ? 1 : 0;
is_system = ctx->ctx_fl_system;
ovfl_mask = pmu_conf.ovfl_val;
task = ctx->ctx_task;
if (state == PFM_CTX_ZOMBIE) return -EINVAL;
if (is_loaded) {
thread = &ctx->ctx_task->thread;
if (likely(is_loaded)) {
thread = &task->thread;
/*
* In system wide and when the context is loaded, access can only happen
* when the caller is running on the CPU being monitored by the session.
* It does not have to be the owner (ctx_task) of the context per se.
*/
if (is_system && ctx->ctx_cpu != smp_processor_id()) {
if (unlikely(is_system && ctx->ctx_cpu != smp_processor_id())) {
DPRINT(("[%d] should be running on CPU%d\n", current->pid, ctx->ctx_cpu));
return -EBUSY;
}
/*
* this can be true when not self-monitoring only in UP
*/
can_access_pmu = GET_PMU_OWNER() == ctx->ctx_task || is_system ? 1 : 0;
can_access_pmu = GET_PMU_OWNER() == task || is_system ? 1 : 0;
if (can_access_pmu) ia64_srlz_d();
}
DPRINT(("enter loaded=%d access_pmu=%d ctx_state=%d\n",
DPRINT(("loaded=%d access_pmu=%d ctx_state=%d\n",
is_loaded,
can_access_pmu,
ctx->ctx_state));
state));
/*
* on both UP and SMP, we can only read the PMD from the hardware register when
......@@ -3319,11 +3302,10 @@ pfm_read_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
for (i = 0; i < count; i++, req++) {
lval = 0UL;
cnum = req->reg_num;
reg_flags = req->reg_flags;
if (!PMD_IS_IMPL(cnum)) goto error;
if (unlikely(!PMD_IS_IMPL(cnum))) goto error;
/*
* we can only read the register that we use. That includes
* the one we explicitely initialize AND the one we want included
......@@ -3332,7 +3314,11 @@ pfm_read_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
* Having this restriction allows optimization in the ctxsw routine
* without compromising security (leaks)
*/
if (!CTX_IS_USED_PMD(ctx, cnum)) goto error;
if (unlikely(!CTX_IS_USED_PMD(ctx, cnum))) goto error;
sval = ctx->ctx_pmds[cnum].val;
lval = ctx->ctx_pmds[cnum].lval;
is_counting = PMD_IS_COUNTING(cnum);
/*
* If the task is not the current one, then we check if the
......@@ -3347,23 +3333,21 @@ pfm_read_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
* if context is zombie, then task does not exist anymore.
* In this case, we use the full value saved in the context (pfm_flush_regs()).
*/
val = state == PFM_CTX_LOADED ? thread->pmds[cnum] : 0UL;
val = is_loaded ? thread->pmds[cnum] : 0UL;
}
if (PMD_IS_COUNTING(cnum)) {
if (is_counting) {
/*
* XXX: need to check for overflow when loaded
*/
val &= ovfl_mask;
val += ctx->ctx_pmds[cnum].val;
lval = ctx->ctx_pmds[cnum].lval;
val += sval;
}
/*
* execute read checker, if any
*/
if (PMD_RD_FUNC(cnum)) {
if (unlikely(PMD_RD_FUNC(cnum))) {
unsigned long v = val;
ret = PMD_RD_FUNC(cnum)(ctx->ctx_task, ctx, cnum, &v, regs);
if (ret) goto error;
......@@ -3373,12 +3357,7 @@ pfm_read_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
PFM_REG_RETFLAG_SET(reg_flags, 0);
DPRINT(("pmd[%u]=0x%lx loaded=%d access_pmu=%d ctx_state=%d\n",
cnum,
val,
is_loaded,
can_access_pmu,
ctx->ctx_state));
DPRINT(("pmd[%u]=0x%lx\n", cnum, val));
/*
* update register return value, abort all if problem during copy.
......@@ -3393,12 +3372,7 @@ pfm_read_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
return 0;
error:
PFM_REG_RETFLAG_SET(reg_flags, PFM_REG_RETFL_EINVAL);
req->reg_flags = PFM_REG_RETFL_EINVAL;
DPRINT(("error pmd[%u]=0x%lx\n", cnum, val));
PFM_REG_RETFLAG_SET(req->reg_flags, PFM_REG_RETFL_EINVAL);
return ret;
}
......@@ -3628,7 +3602,7 @@ pfm_restart(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
prefetch(ctx->ctx_smpl_hdr);
rst_ctrl.bits.mask_monitoring = 0;
rst_ctrl.bits.reset_ovfl_pmds = 1;
rst_ctrl.bits.reset_ovfl_pmds = 0;
if (state == PFM_CTX_LOADED)
ret = pfm_buf_fmt_restart_active(fmt, task, &rst_ctrl, ctx->ctx_smpl_hdr, regs);
......@@ -3748,6 +3722,7 @@ static int
pfm_write_ibr_dbr(int mode, pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
{
struct thread_struct *thread = NULL;
struct task_struct *task;
pfarg_dbreg_t *req = (pfarg_dbreg_t *)arg;
unsigned long flags;
dbreg_t dbreg;
......@@ -3762,6 +3737,7 @@ pfm_write_ibr_dbr(int mode, pfm_context_t *ctx, void *arg, int count, struct pt_
state = ctx->ctx_state;
is_loaded = state == PFM_CTX_LOADED ? 1 : 0;
is_system = ctx->ctx_fl_system;
task = ctx->ctx_task;
if (state == PFM_CTX_TERMINATED || state == PFM_CTX_ZOMBIE) return -EINVAL;
......@@ -3770,17 +3746,17 @@ pfm_write_ibr_dbr(int mode, pfm_context_t *ctx, void *arg, int count, struct pt_
* the owner of the local PMU.
*/
if (is_loaded) {
thread = &ctx->ctx_task->thread;
thread = &task->thread;
/*
* In system wide and when the context is loaded, access can only happen
* when the caller is running on the CPU being monitored by the session.
* It does not have to be the owner (ctx_task) of the context per se.
*/
if (is_system && ctx->ctx_cpu != smp_processor_id()) {
if (unlikely(is_system && ctx->ctx_cpu != smp_processor_id())) {
DPRINT(("[%d] should be running on CPU%d\n", current->pid, ctx->ctx_cpu));
return -EBUSY;
}
can_access_pmu = GET_PMU_OWNER() == ctx->ctx_task || is_system ? 1 : 0;
can_access_pmu = GET_PMU_OWNER() == task || is_system ? 1 : 0;
}
/*
......@@ -3796,7 +3772,7 @@ pfm_write_ibr_dbr(int mode, pfm_context_t *ctx, void *arg, int count, struct pt_
* don't bother if we are loaded and task is being debugged
*/
if (is_loaded && (thread->flags & IA64_THREAD_DBG_VALID) != 0) {
DPRINT(("debug registers already in use for [%d]\n", ctx->ctx_task->pid));
DPRINT(("debug registers already in use for [%d]\n", task->pid));
return -EBUSY;
}
......@@ -3837,7 +3813,7 @@ pfm_write_ibr_dbr(int mode, pfm_context_t *ctx, void *arg, int count, struct pt_
* is shared by all processes running on it
*/
if (first_time && can_access_pmu) {
DPRINT(("[%d] clearing ibrs, dbrs\n", ctx->ctx_task->pid));
DPRINT(("[%d] clearing ibrs, dbrs\n", task->pid));
for (i=0; i < pmu_conf.num_ibrs; i++) {
ia64_set_ibr(i, 0UL);
ia64_srlz_i();
......@@ -3860,7 +3836,7 @@ pfm_write_ibr_dbr(int mode, pfm_context_t *ctx, void *arg, int count, struct pt_
ret = -EINVAL;
if ((mode == PFM_CODE_RR && !IBR_IS_IMPL(rnum)) || ((mode == PFM_DATA_RR) && !DBR_IS_IMPL(rnum))) {
if ((mode == PFM_CODE_RR && rnum >= PFM_NUM_IBRS) || ((mode == PFM_DATA_RR) && rnum >= PFM_NUM_DBRS)) {
DPRINT(("invalid register %u val=0x%lx mode=%d i=%d count=%d\n",
rnum, dbreg.val, mode, i, count));
......@@ -4434,6 +4410,7 @@ pfm_context_unload(pfm_context_t *ctx, void *arg, int count, struct pt_regs *reg
struct task_struct *task = PFM_CTX_TASK(ctx);
struct pt_regs *tregs;
int state, is_system;
int ret;
DPRINT(("ctx_state=%d task [%d]\n", ctx->ctx_state, task ? task->pid : -1));
......@@ -4451,7 +4428,8 @@ pfm_context_unload(pfm_context_t *ctx, void *arg, int count, struct pt_regs *reg
/*
* clear psr and dcr bits
*/
pfm_stop(ctx, NULL, 0, regs);
ret = pfm_stop(ctx, NULL, 0, regs);
if (ret) return ret;
ctx->ctx_state = state = PFM_CTX_UNLOADED;
......@@ -4760,37 +4738,45 @@ sys_perfmonctl (int fd, int cmd, void *arg, int count, long arg5, long arg6, lon
void *args_k = NULL;
long ret; /* will expand int return types */
size_t base_sz, sz, xtra_sz = 0;
int narg, completed_args = 0, call_made = 0;
int narg, completed_args = 0, call_made = 0, cmd_flags;
int (*func)(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs);
int (*getsize)(void *arg, size_t *sz);
#define PFM_MAX_ARGSIZE 4096
/*
* reject any call if perfmon was disabled at initialization time
mask*/
if (PFM_IS_DISABLED()) return -ENOSYS;
* reject any call if perfmon was disabled at initialization
*/
if (unlikely(PFM_IS_DISABLED())) return -ENOSYS;
if (unlikely(cmd < 0 || cmd >= PFM_CMD_COUNT)) {
DPRINT(("[%d] invalid cmd=%d\n", current->pid, cmd));
return -EINVAL;
}
func = pfm_cmd_tab[cmd].cmd_func;
narg = pfm_cmd_tab[cmd].cmd_narg;
base_sz = pfm_cmd_tab[cmd].cmd_argsize;
getsize = pfm_cmd_tab[cmd].cmd_getsize;
cmd_flags = pfm_cmd_tab[cmd].cmd_flags;
if (unlikely(PFM_CMD_IS_VALID(cmd) == 0)) {
if (unlikely(func == NULL)) {
DPRINT(("[%d] invalid cmd=%d\n", current->pid, cmd));
return -EINVAL;
}
DPRINT(("cmd=%s idx=%d valid=%d narg=0x%x argsz=%lu count=%d\n",
DPRINT(("cmd=%s idx=%d narg=0x%x argsz=%lu count=%d\n",
PFM_CMD_NAME(cmd),
PFM_CMD_IDX(cmd),
PFM_CMD_IS_VALID(cmd),
PFM_CMD_NARG(cmd),
PFM_CMD_ARG_SIZE(cmd),
cmd,
narg,
base_sz,
count));
/*
* check if number of arguments matches what the command expects
*/
narg = PFM_CMD_NARG(cmd);
if ((narg == PFM_CMD_ARG_MANY && count <= 0) || (narg > 0 && narg != count))
if (unlikely((narg == PFM_CMD_ARG_MANY && count <= 0) || (narg > 0 && narg != count)))
return -EINVAL;
/* get single argument size */
base_sz = PFM_CMD_ARG_SIZE(cmd);
restart_args:
sz = xtra_sz + base_sz*count;
/*
......@@ -4804,7 +4790,7 @@ sys_perfmonctl (int fd, int cmd, void *arg, int count, long arg5, long arg6, lon
/*
* allocate default-sized argument buffer
*/
if (count && args_k == NULL) {
if (likely(count && args_k == NULL)) {
args_k = kmalloc(PFM_MAX_ARGSIZE, GFP_KERNEL);
if (args_k == NULL) return -ENOMEM;
}
......@@ -4824,11 +4810,11 @@ sys_perfmonctl (int fd, int cmd, void *arg, int count, long arg5, long arg6, lon
/*
* check if command supports extra parameters
*/
if (completed_args == 0 && PFM_CMD_GETSIZE(cmd)) {
if (completed_args == 0 && getsize) {
/*
* get extra parameters size (based on main argument)
*/
ret = PFM_CMD_GETSIZE(cmd)(args_k, &xtra_sz);
ret = (*getsize)(args_k, &xtra_sz);
if (ret) goto error_args;
completed_args = 1;
......@@ -4836,29 +4822,29 @@ sys_perfmonctl (int fd, int cmd, void *arg, int count, long arg5, long arg6, lon
DPRINT(("[%d] restart_args sz=%lu xtra_sz=%lu\n", current->pid, sz, xtra_sz));
/* retry if necessary */
if (xtra_sz) goto restart_args;
if (likely(xtra_sz)) goto restart_args;
}
if (PFM_CMD_USE_FD(cmd)) {
if (unlikely((cmd_flags & PFM_CMD_FD) == 0)) goto skip_fd;
ret = -EBADF;
file = fget(fd);
if (file == NULL) {
if (unlikely(file == NULL)) {
DPRINT(("[%d] invalid fd %d\n", current->pid, fd));
goto error_args;
}
if (PFM_IS_FILE(file) == 0) {
if (unlikely(PFM_IS_FILE(file) == 0)) {
DPRINT(("[%d] fd %d not related to perfmon\n", current->pid, fd));
goto error_args;
}
ctx = (pfm_context_t *)file->private_data;
if (ctx == NULL) {
if (unlikely(ctx == NULL)) {
DPRINT(("[%d] no context for fd %d\n", current->pid, fd));
goto error_args;
}
prefetch(&ctx->ctx_state);
PROTECT_CTX(ctx, flags);
......@@ -4866,15 +4852,15 @@ sys_perfmonctl (int fd, int cmd, void *arg, int count, long arg5, long arg6, lon
* check task is stopped
*/
ret = pfm_check_task_state(ctx, cmd, flags);
if (ret) goto abort_locked;
}
if (unlikely(ret)) goto abort_locked;
ret = (*pfm_cmd_tab[PFM_CMD_IDX(cmd)].cmd_func)(ctx, args_k, count, regs);
skip_fd:
ret = (*func)(ctx, args_k, count, regs);
call_made = 1;
abort_locked:
if (ctx) {
if (likely(ctx)) {
DPRINT(("[%d] context unlocked\n", current->pid));
UNPROTECT_CTX(ctx, flags);
fput(file);
......@@ -4907,7 +4893,7 @@ pfm_resume_after_ovfl(pfm_context_t *ctx, unsigned long ovfl_regs, struct pt_reg
if (CTX_HAS_SMPL(ctx)) {
rst_ctrl.bits.mask_monitoring = 0;
rst_ctrl.bits.reset_ovfl_pmds = 1;
rst_ctrl.bits.reset_ovfl_pmds = 0;
if (state == PFM_CTX_LOADED)
ret = pfm_buf_fmt_restart_active(fmt, current, &rst_ctrl, ctx->ctx_smpl_hdr, regs);
......@@ -5096,7 +5082,7 @@ pfm_ovfl_notify_user(pfm_context_t *ctx, unsigned long ovfl_pmds)
msg->pfm_ovfl_msg.msg_ovfl_pmds[1] = 0UL;
msg->pfm_ovfl_msg.msg_ovfl_pmds[2] = 0UL;
msg->pfm_ovfl_msg.msg_ovfl_pmds[3] = 0UL;
msg->pfm_ovfl_msg.msg_tstamp = ia64_get_itc(); /* relevant on UP only */
msg->pfm_ovfl_msg.msg_tstamp = 0UL;
}
DPRINT(("ovfl msg: msg=%p no_msg=%d fd=%d pid=%d ovfl_pmds=0x%lx\n",
......@@ -5119,10 +5105,12 @@ pfm_end_notify_user(pfm_context_t *ctx)
printk(KERN_ERR "perfmon: pfm_end_notify_user no more notification msgs\n");
return -1;
}
/* no leak */
memset(msg, 0, sizeof(*msg));
msg->pfm_end_msg.msg_type = PFM_MSG_END;
msg->pfm_end_msg.msg_ctx_fd = ctx->ctx_fd;
msg->pfm_ovfl_msg.msg_tstamp = ia64_get_itc(); /* relevant on UP only */
msg->pfm_ovfl_msg.msg_tstamp = 0UL;
DPRINT(("end msg: msg=%p no_msg=%d ctx_fd=%d pid=%d\n",
msg,
......@@ -5141,8 +5129,8 @@ pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx, u64 pmc0, str
{
pfm_ovfl_arg_t ovfl_arg;
unsigned long mask;
unsigned long old_val, ovfl_val;
unsigned long ovfl_notify = 0UL, ovfl_pmds = 0UL, smpl_pmds = 0UL;
unsigned long old_val, ovfl_val, new_val;
unsigned long ovfl_notify = 0UL, ovfl_pmds = 0UL, smpl_pmds = 0UL, reset_pmds;
unsigned long tstamp;
pfm_ovfl_ctrl_t ovfl_ctrl;
unsigned int i, has_smpl;
......@@ -5156,20 +5144,18 @@ pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx, u64 pmc0, str
if (unlikely((pmc0 & 0x1) == 0)) goto sanity_check;
tstamp = ia64_get_itc();
mask = pmc0 >> PMU_FIRST_COUNTER;
ovfl_val = pmu_conf.ovfl_val;
has_smpl = CTX_HAS_SMPL(ctx);
DPRINT_ovfl(("pmc0=0x%lx pid=%d iip=0x%lx, %s "
"used_pmds=0x%lx reload_pmcs=0x%lx\n",
"used_pmds=0x%lx\n",
pmc0,
task ? task->pid: -1,
(regs ? regs->cr_iip : 0),
CTX_OVFL_NOBLOCK(ctx) ? "nonblocking" : "blocking",
ctx->ctx_used_pmds[0],
ctx->ctx_reload_pmcs[0]));
ctx->ctx_used_pmds[0]));
has_smpl = CTX_HAS_SMPL(ctx);
/*
* first we update the virtual counters
......@@ -5180,29 +5166,31 @@ pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx, u64 pmc0, str
/* skip pmd which did not overflow */
if ((mask & 0x1) == 0) continue;
DPRINT_ovfl(("pmd[%d] overflowed hw_pmd=0x%lx ctx_pmd=0x%lx\n",
i, ia64_get_pmd(i), ctx->ctx_pmds[i].val));
/*
* Note that the pmd is not necessarily 0 at this point as qualified events
* may have happened before the PMU was frozen. The residual count is not
* taken into consideration here but will be with any read of the pmd via
* pfm_read_pmds().
*/
old_val = ctx->ctx_pmds[i].val;
ctx->ctx_pmds[i].val += 1 + ovfl_val;
old_val = new_val = ctx->ctx_pmds[i].val;
new_val += 1 + ovfl_val;
ctx->ctx_pmds[i].val = new_val;
/*
* check for overflow condition
*/
if (likely(old_val > ctx->ctx_pmds[i].val)) {
if (likely(old_val > new_val)) {
ovfl_pmds |= 1UL << i;
if (PMC_OVFL_NOTIFY(ctx, i)) ovfl_notify |= 1UL << i;
}
DPRINT_ovfl(("ctx_pmd[%d].val=0x%lx old_val=0x%lx pmd=0x%lx ovfl_pmds=0x%lx ovfl_notify=0x%lx smpl_pmds=0x%lx\n",
i, ctx->ctx_pmds[i].val, old_val,
ia64_get_pmd(i) & ovfl_val, ovfl_pmds, ovfl_notify, smpl_pmds));
DPRINT_ovfl(("ctx_pmd[%d].val=0x%lx old_val=0x%lx pmd=0x%lx ovfl_pmds=0x%lx ovfl_notify=0x%lx\n",
i,
new_val,
old_val,
ia64_get_pmd(i) & ovfl_val,
ovfl_pmds,
ovfl_notify));
}
/*
......@@ -5214,6 +5202,7 @@ pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx, u64 pmc0, str
* reset all control bits
*/
ovfl_ctrl.val = 0;
reset_pmds = 0UL;
/*
* if a sampling format module exists, then we "cache" the overflow by
......@@ -5275,7 +5264,10 @@ pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx, u64 pmc0, str
ovfl_ctrl.bits.notify_user |= ovfl_arg.ovfl_ctrl.bits.notify_user;
ovfl_ctrl.bits.block_task |= ovfl_arg.ovfl_ctrl.bits.block_task;
ovfl_ctrl.bits.mask_monitoring |= ovfl_arg.ovfl_ctrl.bits.mask_monitoring;
ovfl_ctrl.bits.reset_ovfl_pmds |= ovfl_arg.ovfl_ctrl.bits.reset_ovfl_pmds; /* yes or no */
/*
* build the bitmask of pmds to reset now
*/
if (ovfl_arg.ovfl_ctrl.bits.reset_ovfl_pmds) reset_pmds |= mask;
pfm_stats[this_cpu].pfm_smpl_handler_cycles += end_cycles - start_cycles;
}
......@@ -5287,6 +5279,10 @@ pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx, u64 pmc0, str
current->pid,
pmd_mask<<PMU_FIRST_COUNTER));
}
/*
* remove the pmds we reset now from the set of pmds to reset in pfm_restart()
*/
ovfl_pmds &= ~reset_pmds;
} else {
/*
* when no sampling module is used, then the default
......@@ -5296,14 +5292,21 @@ pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx, u64 pmc0, str
ovfl_ctrl.bits.block_task = ovfl_notify ? 1 : 0;
ovfl_ctrl.bits.mask_monitoring = ovfl_notify ? 1 : 0; /* XXX: change for saturation */
ovfl_ctrl.bits.reset_ovfl_pmds = ovfl_notify ? 0 : 1;
/*
* if needed, we reset all overflowed pmds
*/
if (ovfl_notify == 0) reset_pmds = ovfl_pmds;
}
DPRINT(("current [%d] ovfl_pmds=0x%lx reset_pmds=0x%lx\n",
current->pid,
ovfl_pmds,
reset_pmds));
/*
* if we (still) have some overflowed PMD but no notification is requested
* then we use the short reset period.
* reset the requested PMD registers using the short reset values
*/
if (ovfl_ctrl.bits.reset_ovfl_pmds) {
unsigned long bm = ovfl_pmds;
if (reset_pmds) {
unsigned long bm = reset_pmds;
pfm_reset_regs(ctx, &bm, PFM_PMD_SHORT_RESET);
}
......
arch/ia64/kernel/perfmon_default_smpl.c
View file @ 4ab241d2
......@@ -178,6 +178,7 @@ default_handler(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg, struct
ent->tstamp = stamp;
ent->cpu = smp_processor_id();
ent->set = arg->active_set;
ent->tgid = current->tgid;
/*
* selectively store PMDs in increasing index number
......
include/asm-ia64/perfmon_default_smpl.h
View file @ 4ab241d2
......@@ -59,7 +59,7 @@ typedef struct {
* last_reset_value member indicates the initial value of the overflowed PMD.
*/
typedef struct {
int pid; /* active process at PMU interrupt point */
int pid; /* thread id (for NPTL, this is gettid()) */
unsigned char reserved1[3]; /* reserved for future use */
unsigned char ovfl_pmd; /* index of overflowed PMD */
......@@ -69,7 +69,7 @@ typedef struct {
unsigned short cpu; /* cpu on which the overfow occured */
unsigned short set; /* event set active when overflow ocurred */
unsigned int reserved2; /* for future use */
int tgid; /* thread group id (for NPTL, this is getpid()) */
} pfm_default_smpl_entry_t;
#define PFM_DEFAULT_MAX_PMDS 64 /* how many pmds supported by data structures (sizeof(unsigned long) */
......
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