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Commit f0626604 authored by Stéphane Eranian's avatar Stéphane Eranian Committed by David Mosberger
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[PATCH] Fix ia64 perfmon for 2.5.6 

Fix up earlier perfmon breakage.
parent 0cf41a81
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Showing with 212 additions and 165 deletions
arch/ia64/kernel/perfmon.c
View file @ f0626604
......@@ -38,8 +38,8 @@
#ifdef CONFIG_PERFMON
/*
* For PMU which rely on the debug registers for some features, you must
* you must enable the following flag to activate the support for
* For PMUs which rely on the debug registers for some features, you
* must enable the following flag to activate the support for
* accessing the registers via the perfmonctl() interface.
*/
#ifdef CONFIG_ITANIUM
......@@ -313,6 +313,9 @@ static unsigned long pfm_spurious_ovfl_intr_count; /* keep track of spurious ovf
static unsigned long pfm_ovfl_intr_count; /* keep track of spurious ovfl interrupts */
static unsigned long pfm_recorded_samples_count;
static unsigned long reset_pmcs[IA64_NUM_PMC_REGS]; /* contains PAL reset values for PMCS */
static void pfm_vm_close(struct vm_area_struct * area);
static struct vm_operations_struct pfm_vm_ops={
close: pfm_vm_close
......@@ -331,7 +334,9 @@ static struct {
* forward declarations
*/
static void ia64_reset_pmu(struct task_struct *);
#ifdef CONFIG_SMP
static void pfm_fetch_regs(int cpu, struct task_struct *task, pfm_context_t *ctx);
#endif
static void pfm_lazy_save_regs (struct task_struct *ta);
static inline unsigned long
......@@ -422,7 +427,7 @@ pfm_rvfree(void *mem, unsigned long size)
if (mem) {
adr=(unsigned long) mem;
while ((long) size > 0)
while ((long) size > 0) {
mem_map_unreserve(vmalloc_to_page((void*)adr));
adr+=PAGE_SIZE;
size-=PAGE_SIZE;
......@@ -1500,11 +1505,12 @@ pfm_restart(struct task_struct *task, pfm_context_t *ctx, void *arg, int count,
*/
if (!CTX_IS_ENABLED(ctx)) return -EINVAL;
#if 0
if (ctx->ctx_fl_frozen==0) {
printk("task %d without pmu_frozen set\n", task->pid);
return -EINVAL;
}
#endif
if (task == current) {
DBprintk(("restarting self %d frozen=%d \n", current->pid, ctx->ctx_fl_frozen));
......@@ -1569,32 +1575,150 @@ pfm_restart(struct task_struct *task, pfm_context_t *ctx, void *arg, int count,
return 0;
}
#ifndef CONFIG_SMP
/*
* On UP kernels, we do not need to constantly set the psr.pp bit
* when a task is scheduled. The psr.pp bit can only be changed in
* the kernel because of a user request. Given we are on a UP non preeemptive
* kernel we know that no other task is running, so we cna simply update their
* psr.pp from their saved state. There is this no impact on the context switch
* code compared to the SMP case.
*/
static void
pfm_tasklist_toggle_pp(unsigned int val)
{
struct task_struct *p;
struct pt_regs *regs;
DBprintk(("invoked by [%d] pp=%u\n", current->pid, val));
read_lock(&tasklist_lock);
for_each_task(p) {
regs = (struct pt_regs *)((unsigned long) p + IA64_STK_OFFSET);
/*
* position on pt_regs saved on stack on 1st entry into the kernel
*/
regs--;
/*
* update psr.pp
*/
ia64_psr(regs)->pp = val;
}
read_unlock(&tasklist_lock);
}
#endif
static int
pfm_destroy_context(struct task_struct *task, pfm_context_t *ctx, void *arg, int count,
pfm_stop(struct task_struct *task, pfm_context_t *ctx, void *arg, int count,
struct pt_regs *regs)
{
/* we don't quite support this right now */
if (task != current) return -EINVAL;
/*
* Cannot do anything before PMU is enabled
*/
if (!CTX_IS_ENABLED(ctx)) return -EINVAL;
DBprintk(("[%d] fl_system=%d owner=%p current=%p\n",
current->pid,
ctx->ctx_fl_system, PMU_OWNER(),
current));
/* simply stop monitoring but not the PMU */
if (ctx->ctx_fl_system) {
ia64_psr(regs)->pp = 0;
__asm__ __volatile__ ("rsm psr.pp;;"::: "memory");
/* disable dcr pp */
ia64_set_dcr(ia64_get_dcr() & ~IA64_DCR_PP);
#ifdef CONFIG_SMP
local_cpu_data->pfm_dcr_pp = 0;
#else
pfm_tasklist_toggle_pp(0);
#endif
ia64_psr(regs)->pp = 0;
} else {
ia64_psr(regs)->up = 0;
__asm__ __volatile__ ("rum psr.up;;"::: "memory");
task->thread.flags &= ~IA64_THREAD_PM_VALID;
ia64_psr(regs)->up = 0;
}
return 0;
}
SET_PMU_OWNER(NULL);
static int
pfm_disable(struct task_struct *task, pfm_context_t *ctx, void *arg, int count,
struct pt_regs *regs)
{
/* we don't quite support this right now */
if (task != current) return -EINVAL;
/* freeze PMU */
ia64_set_pmc(0, 1);
ia64_srlz_d();
if (!CTX_IS_ENABLED(ctx)) return -EINVAL;
/*
* stop monitoring, freeze PMU, and save state in context
* this call will clear IA64_THREAD_PM_VALID for per-task sessions.
*/
pfm_flush_regs(task);
if (ctx->ctx_fl_system) {
ia64_psr(regs)->pp = 0;
} else {
ia64_psr(regs)->up = 0;
}
/*
* goes back to default behavior
* no need to change live psr.sp because useless at the kernel level
*/
ia64_psr(regs)->sp = 1;
DBprintk(("enabling psr.sp for [%d]\n", current->pid));
ctx->ctx_flags.state = PFM_CTX_DISABLED;
return 0;
}
static int
pfm_destroy_context(struct task_struct *task, pfm_context_t *ctx, void *arg, int count,
struct pt_regs *regs)
{
/* we don't quite support this right now */
if (task != current) return -EINVAL;
/*
* if context was never enabled, then there is not much
* to do
*/
if (!CTX_IS_ENABLED(ctx)) goto skipped_stop;
/*
* Disable context: stop monitoring, flush regs to software state (useless here),
* and freeze PMU
*
* The IA64_THREAD_PM_VALID is cleared by pfm_flush_regs() called from pfm_disable()
*/
pfm_disable(task, ctx, arg, count, regs);
if (ctx->ctx_fl_system) {
ia64_psr(regs)->pp = 0;
} else {
ia64_psr(regs)->up = 0;
}
/* restore security level */
ia64_psr(regs)->sp = 1;
skipped_stop:
/*
* remove sampling buffer mapping, if any
*/
......@@ -1910,8 +2034,13 @@ pfm_start(struct task_struct *task, pfm_context_t *ctx, void *arg, int count,
/* enable dcr pp */
ia64_set_dcr(ia64_get_dcr()|IA64_DCR_PP);
#ifdef CONFIG_SMP
local_cpu_data->pfm_dcr_pp = 1;
#else
pfm_tasklist_toggle_pp(1);
#endif
ia64_psr(regs)->pp = 1;
__asm__ __volatile__ ("ssm psr.pp;;"::: "memory");
} else {
......@@ -1985,80 +2114,6 @@ pfm_enable(struct task_struct *task, pfm_context_t *ctx, void *arg, int count,
return 0;
}
static int
pfm_disable(struct task_struct *task, pfm_context_t *ctx, void *arg, int count,
struct pt_regs *regs)
{
/* we don't quite support this right now */
if (task != current) return -EINVAL;
if (!CTX_IS_ENABLED(ctx)) return -EINVAL;
/*
* stop monitoring, freeze PMU, and save state in context
*/
pfm_flush_regs(task);
/*
* just to make sure nothing starts again when back in user mode.
* pfm_flush_regs() freezes the PMU anyway.
*/
if (ctx->ctx_fl_system) {
ia64_psr(regs)->pp = 0;
} else {
ia64_psr(regs)->up = 0;
}
/*
* goes back to default behavior
* no need to change live psr.sp because useless at the kernel level
*/
ia64_psr(regs)->sp = 1;
DBprintk(("enabling psr.sp for [%d]\n", current->pid));
ctx->ctx_flags.state = PFM_CTX_DISABLED;
return 0;
}
static int
pfm_stop(struct task_struct *task, pfm_context_t *ctx, void *arg, int count,
struct pt_regs *regs)
{
/* we don't quite support this right now */
if (task != current) return -EINVAL;
/*
* Cannot do anything before PMU is enabled
*/
if (!CTX_IS_ENABLED(ctx)) return -EINVAL;
DBprintk(("[%d] fl_system=%d owner=%p current=%p\n",
current->pid,
ctx->ctx_fl_system, PMU_OWNER(),
current));
/* simply stop monitoring but not the PMU */
if (ctx->ctx_fl_system) {
__asm__ __volatile__ ("rsm psr.pp;;"::: "memory");
/* disable dcr pp */
ia64_set_dcr(ia64_get_dcr() & ~IA64_DCR_PP);
local_cpu_data->pfm_dcr_pp = 0;
ia64_psr(regs)->pp = 0;
__asm__ __volatile__ ("rsm psr.pp;;"::: "memory");
} else {
ia64_psr(regs)->up = 0;
__asm__ __volatile__ ("rum psr.up;;"::: "memory");
}
return 0;
}
/*
* functions MUST be listed in the increasing order of their index (see permfon.h)
*/
......@@ -2730,10 +2785,12 @@ perfmon_proc_info(char *page)
p += sprintf(p, "recorded samples=%lu\n", pfm_recorded_samples_count);
p += sprintf(p, "CPU%d.pmc[0]=%lx\nPerfmon debug: %s\n",
smp_processor_id(), pmc0, pfm_debug ? "On" : "Off");
smp_processor_id(), pmc0, pfm_debug_mode ? "On" : "Off");
#ifdef CONFIG_SMP
p += sprintf(p, "CPU%d cpu_data.pfm_syst_wide=%d cpu_data.dcr_pp=%d\n",
smp_processor_id(), local_cpu_data->pfm_syst_wide, local_cpu_data->pfm_dcr_pp);
#endif
LOCK_PFS();
p += sprintf(p, "proc_sessions=%lu\nsys_sessions=%lu\nsys_use_dbregs=%lu\nptrace_use_dbregs=%lu\n",
......@@ -2772,6 +2829,7 @@ perfmon_read_entry(char *page, char **start, off_t off, int count, int *eof, voi
return len;
}
#ifdef CONFIG_SMP
void
pfm_syst_wide_update_task(struct task_struct *task, int mode)
{
......@@ -2784,6 +2842,8 @@ pfm_syst_wide_update_task(struct task_struct *task, int mode)
*/
ia64_psr(regs)->pp = mode ? local_cpu_data->pfm_dcr_pp : 0;
}
#endif
void
pfm_save_regs (struct task_struct *task)
......@@ -2873,7 +2933,9 @@ pfm_lazy_save_regs (struct task_struct *task)
/* not owned by this CPU */
atomic_set(&ctx->ctx_last_cpu, -1);
#ifdef CONFIG_SMP
do_nothing:
#endif
/*
* declare we are done saving this context
*
......@@ -3010,7 +3072,10 @@ pfm_load_regs (struct task_struct *task)
struct task_struct *owner;
unsigned long mask;
u64 psr;
int i, cpu;
int i;
#ifdef CONFIG_SMP
int cpu;
#endif
owner = PMU_OWNER();
ctx = task->thread.pfm_context;
......@@ -3119,49 +3184,14 @@ pfm_load_regs (struct task_struct *task)
}
static void
pfm_model_specific_reset_pmu(struct task_struct *task)
{
int i;
#ifdef CONFIG_ITANIUM
/* opcode matcher set to all 1s */
ia64_set_pmc(8,~0UL);
ia64_set_pmc(9,~0UL);
/* I-EAR config cleared, plm=0 */
ia64_set_pmc(10,0UL);
/* D-EAR config cleared, PMC[11].pt must be 1 */
ia64_set_pmc(11,1UL << 28);
/* BTB config. plm=0 */
ia64_set_pmc(12,0UL);
/* Instruction address range, PMC[13].ta must be 1 */
ia64_set_pmc(13,1UL);
/*
* Clear all PMDs
*
* XXX: may be good enough to rely on the impl_regs to generalize
* this.
*/
for(i = 0; i< 18 ; i++) {
ia64_set_pmd(i,0UL);
}
#endif
}
/*
* XXX: this routine is not very portable for PMCs
* XXX: make this routine able to work with non current context
*/
static void
ia64_reset_pmu(struct task_struct *task)
{
pfm_context_t *ctx = task->thread.pfm_context;
struct thread_struct *t = &task->thread;
pfm_context_t *ctx = t->pfm_context;
unsigned long mask;
int i;
......@@ -3170,34 +3200,36 @@ ia64_reset_pmu(struct task_struct *task)
return;
}
/* PMU is frozen, no pending overflow bits */
/* Let's make sure the PMU is frozen */
ia64_set_pmc(0,1);
/*
* Let's first do the architected initializations
* install reset values for PMC. We skip PMC0 (done above)
* XX: good up to 64 PMCS
*/
mask = pmu_conf.impl_regs[0] >> 1;
for(i=1; mask; mask>>=1, i++) {
if (mask & 0x1) {
ia64_set_pmc(i, reset_pmcs[i]);
/*
* When restoring context, we must restore ALL pmcs, even the ones
* that the task does not use to avoid leaks and possibly corruption
* of the sesion because of configuration conflicts. So here, we
* initializaed the table used in the context switch restore routine.
*/
t->pmc[i] = reset_pmcs[i];
DBprintk((" pmc[%d]=0x%lx\n", i, reset_pmcs[i]));
/* clear counters */
ia64_set_pmd(4,0UL);
ia64_set_pmd(5,0UL);
ia64_set_pmd(6,0UL);
ia64_set_pmd(7,0UL);
/* clear overflow status bits */
ia64_set_pmc(1,0UL);
ia64_set_pmc(2,0UL);
ia64_set_pmc(3,0UL);
/* clear counting monitor configuration */
ia64_set_pmc(4,0UL);
ia64_set_pmc(5,0UL);
ia64_set_pmc(6,0UL);
ia64_set_pmc(7,0UL);
}
}
/*
* Now let's do the CPU model specific initializations
* clear reset values for PMD.
* XX: good up to 64 PMDS. Suppose that zero is a valid value.
*/
pfm_model_specific_reset_pmu(task);
mask = pmu_conf.impl_regs[4];
for(i=0; mask; mask>>=1, i++) {
if (mask & 0x1) ia64_set_pmd(i, 0UL);
}
/*
* On context switched restore, we must restore ALL pmc even
......@@ -3221,19 +3253,6 @@ ia64_reset_pmu(struct task_struct *task)
*/
ctx->ctx_reload_pmcs[0] = pmu_conf.impl_regs[0];
/*
* make sure we pick up whatever values were installed
* for the CPU model specific reset. We also include
* the architected PMC (pmc4-pmc7)
*
* This step is required in order to restore the correct values in PMC when
* the task is switched out and back in just after the PFM_ENABLE.
*/
mask = pmu_conf.impl_regs[0];
for (i=0; mask; i++, mask>>=1) {
if (mask & 0x1) t->pmc[i] = ia64_get_pmc(i);
}
/*
* useful in case of re-enable after disable
*/
......@@ -3280,14 +3299,18 @@ pfm_flush_regs (struct task_struct *task)
* By now, we could still have an overflow interrupt in-flight.
*/
if (ctx->ctx_fl_system) {
__asm__ __volatile__ ("rsm psr.pp;;"::: "memory");
/* disable dcr pp */
ia64_set_dcr(ia64_get_dcr() & ~IA64_DCR_PP);
#ifdef CONFIG_SMP
local_cpu_data->pfm_syst_wide = 0;
local_cpu_data->pfm_dcr_pp = 0;
__asm__ __volatile__ ("rsm psr.pp;;"::: "memory");
#else
pfm_tasklist_toggle_pp(0);
#endif
} else {
......@@ -3386,6 +3409,7 @@ pfm_flush_regs (struct task_struct *task)
}
/*
* task is the newly created task, pt_regs for new child
*/
......@@ -3803,6 +3827,17 @@ static struct irqaction perfmon_irqaction = {
};
static void
pfm_pmu_snapshot(void)
{
int i;
for (i=0; i < IA64_NUM_PMC_REGS; i++) {
if (i >= pmu_conf.num_pmcs) break;
if (PMC_IS_IMPL(i)) reset_pmcs[i] = ia64_get_pmc(i);
}
}
/*
* perfmon initialization routine, called from the initcall() table
*/
......@@ -3836,8 +3871,7 @@ perfmon_init (void)
pmu_conf.num_pmcs = find_num_pm_regs(pmu_conf.impl_regs);
pmu_conf.num_pmds = find_num_pm_regs(&pmu_conf.impl_regs[4]);
printk("perfmon: %u bits counters (max value 0x%016lx)\n",
pm_info.pal_perf_mon_info_s.width, pmu_conf.perf_ovfl_val);
printk("perfmon: %u bits counters\n", pm_info.pal_perf_mon_info_s.width);
printk("perfmon: %lu PMC/PMD pairs, %lu PMCs, %lu PMDs\n",
pmu_conf.max_counters, pmu_conf.num_pmcs, pmu_conf.num_pmds);
......@@ -3856,6 +3890,19 @@ perfmon_init (void)
pmu_conf.num_ibrs <<=1;
pmu_conf.num_dbrs <<=1;
/*
* take a snapshot of all PMU registers. PAL is supposed
* to configure them with stable/safe values, i.e., not
* capturing anything.
* We take a snapshot now, before we make any modifications. This
* will become our master copy. Then we will reuse the snapshot
* to reset the PMU in pfm_enable(). Using this technique, perfmon
* does NOT have to know about the specific values to program for
* the PMC/PMD. The safe values may be different from one CPU model to
* the other.
*/
pfm_pmu_snapshot();
/*
* list the pmc registers used to control monitors
* XXX: unfortunately this information is not provided by PAL
......
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