static int irq_affinity_write_proc(struct file *file, const char __user *buffer,
unsigned long count, void *data)
{
unsigned int irq = (int)(long)data, full_count = count, err;
cpumask_t new_value, tmp;
if (!irq_desc[irq].chip->set_affinity || no_irq_affinity ||
irq_balancing_disabled(irq))
return -EIO;
err = cpumask_parse_user(buffer, count, new_value);
if (err)
return err;
if (!is_affinity_mask_valid(new_value))
return -EINVAL;
/*
* Do not allow disabling IRQs completely - it's a too easy
* way to make the system unusable accidentally :-) At least
* one online CPU still has to be targeted.
*/
cpus_and(tmp, new_value, cpu_online_map);
if (cpus_empty(tmp))
/* Special case for empty set - allow the architecture
code to set default SMP affinity. */
return select_smp_affinity(irq) ? -EINVAL : full_count;
irq_set_affinity(irq, new_value);
return full_count;
}
static ssize_t irq_affinity_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *pos)
{
unsigned int irq = (int)(long)PDE(file->f_path.dentry->d_inode)->data;
cpumask_t new_value;
int err;
if (!irq_to_desc(irq)->chip->set_affinity || no_irq_affinity ||
irq_balancing_disabled(irq))
return -EIO;
err = cpumask_parse_user(buffer, count, new_value);
if (err)
return err;
if (!is_affinity_mask_valid(new_value))
return -EINVAL;
/*
* Do not allow disabling IRQs completely - it's a too easy
* way to make the system unusable accidentally :-) At least
* one online CPU still has to be targeted.
*/
if (!cpus_intersects(new_value, cpu_online_map))
/* Special case for empty set - allow the architecture
code to set default SMP affinity. */
return irq_select_affinity(irq) ? -EINVAL : count;
irq_set_affinity(irq, new_value);
return count;
}
void intc_balancing_disable(unsigned int irq)
{
struct intc_desc_int *d = get_intc_desc(irq);
unsigned long handle = dist_handle[irq];
unsigned long addr;
if (irq_balancing_disabled(irq) || !handle)
return;
addr = INTC_REG(d, _INTC_ADDR_D(handle), 0);
intc_reg_fns[_INTC_FN(handle)](addr, handle, 0);
}
