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oprofile/x86: fix perfctr nmi reservation for mulitplexing 

Multiple virtual counters share one physical counter. The reservation
of virtual counters fails due to duplicate allocation of the same
counter. The counters are already reserved. Thus, virtual counter
reservation may removed at all. This also makes the code easier.

Cc: stable@kernel.org
Signed-off-by: Robert Richter <robert.richter@amd.com>
This commit is contained in:
Robert Richter 2010-02-25 19:16:46 +01:00
parent 8588d10671
commit 68dc819ce8
2 changed files with 6 additions and 24 deletions
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11
arch/x86/oprofile/nmi_int.c
View File

@ -179,7 +179,6 @@ static void nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs)
if (counter_config[i].enabled) {
multiplex[i].saved = -(u64)counter_config[i].count;
} else {
multiplex[i].addr = 0;
multiplex[i].saved = 0;
}
}
@ -189,25 +188,27 @@ static void nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs)
static void nmi_cpu_save_mpx_registers(struct op_msrs *msrs)
{
struct op_msr *counters = msrs->counters;
struct op_msr *multiplex = msrs->multiplex;
int i;
for (i = 0; i < model->num_counters; ++i) {
int virt = op_x86_phys_to_virt(i);
if (multiplex[virt].addr)
rdmsrl(multiplex[virt].addr, multiplex[virt].saved);
if (counters[i].addr)
rdmsrl(counters[i].addr, multiplex[virt].saved);
}
}
static void nmi_cpu_restore_mpx_registers(struct op_msrs *msrs)
{
struct op_msr *counters = msrs->counters;
struct op_msr *multiplex = msrs->multiplex;
int i;
for (i = 0; i < model->num_counters; ++i) {
int virt = op_x86_phys_to_virt(i);
if (multiplex[virt].addr)
wrmsrl(multiplex[virt].addr, multiplex[virt].saved);
if (counters[i].addr)
wrmsrl(counters[i].addr, multiplex[virt].saved);
}
}

19
arch/x86/oprofile/op_model_amd.c
View File

@ -118,19 +118,6 @@ static u32 get_ibs_caps(void)
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
static void op_mux_fill_in_addresses(struct op_msrs * const msrs)
{
int i;
for (i = 0; i < NUM_VIRT_COUNTERS; i++) {
int hw_counter = op_x86_virt_to_phys(i);
if (reserve_perfctr_nmi(MSR_K7_PERFCTR0 + i))
msrs->multiplex[i].addr = MSR_K7_PERFCTR0 + hw_counter;
else
msrs->multiplex[i].addr = 0;
}
}
static void op_mux_switch_ctrl(struct op_x86_model_spec const *model,
struct op_msrs const * const msrs)
{
@ -149,10 +136,6 @@ static void op_mux_switch_ctrl(struct op_x86_model_spec const *model,
}
}
#else
static inline void op_mux_fill_in_addresses(struct op_msrs * const msrs) { }
#endif
/* functions for op_amd_spec */
@ -174,8 +157,6 @@ static void op_amd_fill_in_addresses(struct op_msrs * const msrs)
else
msrs->controls[i].addr = 0;
}
op_mux_fill_in_addresses(msrs);
}
static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,