struct cpu_group *
smp_topo(void)
{
char cpusetbuf[CPUSETBUFSIZ], cpusetbuf2[CPUSETBUFSIZ];
struct cpu_group *top;
/*
* Check for a fake topology request for debugging purposes.
*/
switch (smp_topology) {
case 1:
/* Dual core with no sharing. */
top = smp_topo_1level(CG_SHARE_NONE, 2, 0);
break;
case 2:
/* No topology, all cpus are equal. */
top = smp_topo_none();
break;
case 3:
/* Dual core with shared L2. */
top = smp_topo_1level(CG_SHARE_L2, 2, 0);
break;
case 4:
/* quad core, shared l3 among each package, private l2. */
top = smp_topo_1level(CG_SHARE_L3, 4, 0);
break;
case 5:
/* quad core, 2 dualcore parts on each package share l2. */
top = smp_topo_2level(CG_SHARE_NONE, 2, CG_SHARE_L2, 2, 0);
break;
case 6:
/* Single-core 2xHTT */
top = smp_topo_1level(CG_SHARE_L1, 2, CG_FLAG_HTT);
break;
case 7:
/* quad core with a shared l3, 8 threads sharing L2. */
top = smp_topo_2level(CG_SHARE_L3, 4, CG_SHARE_L2, 8,
CG_FLAG_SMT);
break;
default:
/* Default, ask the system what it wants. */
top = cpu_topo();
break;
}
/*
* Verify the returned topology.
*/
if (top->cg_count != mp_ncpus)
panic("Built bad topology at %p. CPU count %d != %d",
top, top->cg_count, mp_ncpus);
if (CPU_CMP(&top->cg_mask, &all_cpus))
panic("Built bad topology at %p. CPU mask (%s) != (%s)",
top, cpusetobj_strprint(cpusetbuf, &top->cg_mask),
cpusetobj_strprint(cpusetbuf2, &all_cpus));
return (top);
}
struct cpu_group *
cpu_topo(void)
{
if (cpu_cores == 0)
cpu_cores = 1;
if (cpu_logical == 0)
cpu_logical = 1;
if (mp_ncpus % (cpu_cores * cpu_logical) != 0) {
printf("WARNING: Non-uniform processors.\n");
printf("WARNING: Using suboptimal topology.\n");
return (smp_topo_none());
}
/*
* No multi-core or hyper-threaded.
*/
if (cpu_logical * cpu_cores == 1)
return (smp_topo_none());
/*
* Only HTT no multi-core.
*/
if (cpu_logical > 1 && cpu_cores == 1)
return (smp_topo_1level(CG_SHARE_L1, cpu_logical, CG_FLAG_HTT));
/*
* Only multi-core no HTT.
*/
if (cpu_cores > 1 && cpu_logical == 1)
return (smp_topo_1level(CG_SHARE_NONE, cpu_cores, 0));
/*
* Both HTT and multi-core.
*/
return (smp_topo_2level(CG_SHARE_NONE, cpu_cores,
CG_SHARE_L1, cpu_logical, CG_FLAG_HTT));
}
