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authorRobert Richter <robert.richter@amd.com>2009-07-09 14:40:04 +0200
committerRobert Richter <robert.richter@amd.com>2009-07-20 16:43:20 +0200
commit6ab82f958a5dca591a6ea17a3ca6f2aca06f4f2f (patch)
tree49cf59fb2a7341a225911fcebb068d91e6873864 /arch/x86/oprofile/nmi_int.c
parent7e7478c6bc0e011d2854b21f190cc3a1dba89905 (diff)
downloadlinux-2.6.38-lt-ux500-6ab82f958a5dca591a6ea17a3ca6f2aca06f4f2f.tar.gz
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>
Diffstat (limited to 'arch/x86/oprofile/nmi_int.c')
-rw-r--r--arch/x86/oprofile/nmi_int.c76
1 files changed, 40 insertions, 36 deletions
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 02b57b8d0e6..674fa37d150 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -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();