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oprofile/x86: fix perfctr nmi reservation for mulitplexing

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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
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@@ -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);
}
}