/*ARGSUSED*/
static int
kcpc_cpu_setup(cpu_setup_t what, int cpuid, void *arg)
{
pg_cmt_t *chip_pg;
int active_cpus_cnt;
if (what != CPU_ON)
return (0);
/*
* If any CPU-bound contexts exist, we don't need to invalidate
* anything, as no per-LWP contexts can coexist.
*/
if (kcpc_cpuctx)
return (0);
/*
* If this chip now has more than 1 active cpu, we must invalidate all
* contexts in the system.
*/
chip_pg = (pg_cmt_t *)pghw_find_pg(cpu[cpuid], PGHW_CHIP);
if (chip_pg != NULL) {
active_cpus_cnt = GROUP_SIZE(&chip_pg->cmt_cpus_actv);
if (active_cpus_cnt > 1)
kcpc_invalidate_all();
}
return (0);
}
/*ARGSUSED1*/
static int
kcpc_open(dev_t *dev, int flags, int otyp, cred_t *cr)
{
processorid_t cpuid;
int error;
ASSERT(pcbe_ops != NULL);
if ((error = secpolicy_cpc_cpu(cr)) != 0)
return (error);
if (getminor(*dev) != KCPC_MINOR_SHARED)
return (ENXIO);
if ((cpuid = curthread->t_bind_cpu) == PBIND_NONE)
return (EINVAL);
if (cpuid > max_cpuid)
return (EINVAL);
rw_enter(&kcpc_cpuctx_lock, RW_WRITER);
if (++kcpc_cpuctx == 1) {
ASSERT(kcpc_cpumap == NULL);
/*
* Bail out if DTrace is already using the counters.
*/
if (dtrace_cpc_in_use) {
kcpc_cpuctx--;
rw_exit(&kcpc_cpuctx_lock);
return (EAGAIN);
}
kcpc_cpumap = kmem_zalloc(BT_SIZEOFMAP(max_cpuid + 1),
KM_SLEEP);
/*
* When this device is open for processor-based contexts,
* no further lwp-based contexts can be created.
*
* Since this is the first open, ensure that all existing
* contexts are invalidated.
*/
kcpc_invalidate_all();
} else if (BT_TEST(kcpc_cpumap, cpuid)) {
kcpc_cpuctx--;
rw_exit(&kcpc_cpuctx_lock);
return (EAGAIN);
} else if (kcpc_hw_cpu_hook(cpuid, kcpc_cpumap) != 0) {
kcpc_cpuctx--;
rw_exit(&kcpc_cpuctx_lock);
return (EACCES);
}
BT_SET(kcpc_cpumap, cpuid);
rw_exit(&kcpc_cpuctx_lock);
*dev = makedevice(getmajor(*dev), (minor_t)cpuid);
return (0);
}
