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x86/oprofile: Implement multiplexing setup/shutdown functions 

This patch implements nmi_setup_mux() and nmi_shutdown_mux() functions
to setup/shutdown multiplexing. Multiplexing code in nmi_int.c is now
much more separated.

Signed-off-by: Robert Richter <robert.richter@amd.com>
This commit is contained in:
Robert Richter 2009-07-09 14:40:04 +02:00
parent 7e7478c6bc
commit 6ab82f958a
1 changed files with 40 additions and 36 deletions
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76
arch/x86/oprofile/nmi_int.c
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@ -106,9 +106,35 @@ inline int op_x86_phys_to_virt(int phys)
return __get_cpu_var(switch_index) + phys;
}
static void nmi_shutdown_mux(void)
{
int i;
for_each_possible_cpu(i) {
kfree(per_cpu(cpu_msrs, i).multiplex);
per_cpu(cpu_msrs, i).multiplex = NULL;
per_cpu(switch_index, i) = 0;
}
}
static int nmi_setup_mux(void)
{
size_t multiplex_size =
sizeof(struct op_msr) * model->num_virt_counters;
int i;
for_each_possible_cpu(i) {
per_cpu(cpu_msrs, i).multiplex =
kmalloc(multiplex_size, GFP_KERNEL);
if (!per_cpu(cpu_msrs, i).multiplex)
return 0;
}
return 1;
}
#else
inline int op_x86_phys_to_virt(int phys) { return phys; }
static inline void nmi_shutdown_mux(void) { }
static inline int nmi_setup_mux(void) { return 1; }
#endif
@ -120,51 +146,27 @@ static void free_msrs(void)
per_cpu(cpu_msrs, i).counters = NULL;
kfree(per_cpu(cpu_msrs, i).controls);
per_cpu(cpu_msrs, i).controls = NULL;
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
kfree(per_cpu(cpu_msrs, i).multiplex);
per_cpu(cpu_msrs, i).multiplex = NULL;
#endif
}
}
static int allocate_msrs(void)
{
int success = 1;
size_t controls_size = sizeof(struct op_msr) * model->num_controls;
size_t counters_size = sizeof(struct op_msr) * model->num_counters;
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
size_t multiplex_size = sizeof(struct op_msr) * model->num_virt_counters;
#endif
int i;
for_each_possible_cpu(i) {
per_cpu(cpu_msrs, i).counters = kmalloc(counters_size,
GFP_KERNEL);
if (!per_cpu(cpu_msrs, i).counters) {
success = 0;
break;
}
GFP_KERNEL);
if (!per_cpu(cpu_msrs, i).counters)
return 0;
per_cpu(cpu_msrs, i).controls = kmalloc(controls_size,
GFP_KERNEL);
if (!per_cpu(cpu_msrs, i).controls) {
success = 0;
break;
}
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
per_cpu(cpu_msrs, i).multiplex =
kmalloc(multiplex_size, GFP_KERNEL);
if (!per_cpu(cpu_msrs, i).multiplex) {
success = 0;
break;
}
#endif
GFP_KERNEL);
if (!per_cpu(cpu_msrs, i).controls)
return 0;
}
if (!success)
free_msrs();
return success;
return 1;
}
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
@ -218,11 +220,15 @@ static int nmi_setup(void)
int cpu;
if (!allocate_msrs())
return -ENOMEM;
err = -ENOMEM;
else if (!nmi_setup_mux())
err = -ENOMEM;
else
err = register_die_notifier(&profile_exceptions_nb);
err = register_die_notifier(&profile_exceptions_nb);
if (err) {
free_msrs();
nmi_shutdown_mux();
return err;
}
@ -314,9 +320,6 @@ static void nmi_cpu_shutdown(void *dummy)
apic_write(APIC_LVTPC, per_cpu(saved_lvtpc, cpu));
apic_write(APIC_LVTERR, v);
nmi_cpu_restore_registers(msrs);
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
per_cpu(switch_index, cpu) = 0;
#endif
}
static void nmi_shutdown(void)
@ -326,6 +329,7 @@ static void nmi_shutdown(void)
nmi_enabled = 0;
on_each_cpu(nmi_cpu_shutdown, NULL, 1);
unregister_die_notifier(&profile_exceptions_nb);
nmi_shutdown_mux();
msrs = &get_cpu_var(cpu_msrs);
model->shutdown(msrs);
free_msrs();