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#include <linux/slab.h>
#include <asm/uaccess.h>
#include <litmus/rt_param.h>
#include <litmus/reservations/alloc.h>
#include <litmus/reservations/polling.h>
#include <litmus/reservations/table-driven.h>
long alloc_polling_reservation(
int res_type,
struct reservation_config *config,
struct reservation **_res)
{
struct polling_reservation *pres;
int use_edf = config->priority == LITMUS_NO_PRIORITY;
int periodic = res_type == PERIODIC_POLLING;
if (config->polling_params.budget >
config->polling_params.period) {
printk(KERN_ERR "invalid polling reservation (%u): "
"budget > period\n", config->id);
return -EINVAL;
}
if (config->polling_params.budget >
config->polling_params.relative_deadline
&& config->polling_params.relative_deadline) {
printk(KERN_ERR "invalid polling reservation (%u): "
"budget > deadline\n", config->id);
return -EINVAL;
}
if (config->polling_params.offset >
config->polling_params.period) {
printk(KERN_ERR "invalid polling reservation (%u): "
"offset > period\n", config->id);
return -EINVAL;
}
/* XXX: would be nice to use a core-local allocation. */
pres = kzalloc(sizeof(*pres), GFP_KERNEL);
if (!pres)
return -ENOMEM;
polling_reservation_init(pres, use_edf, periodic,
config->polling_params.budget,
config->polling_params.period,
config->polling_params.relative_deadline,
config->polling_params.offset);
pres->res.id = config->id;
if (!use_edf)
pres->res.priority = config->priority;
*_res = &pres->res;
return 0;
}
#define MAX_INTERVALS 1024
long alloc_table_driven_reservation(
struct reservation_config *config,
struct reservation **_res)
{
struct table_driven_reservation *td_res = NULL;
struct lt_interval *slots = NULL;
size_t slots_size;
unsigned int i, num_slots;
long err = -EINVAL;
void *mem;
if (!config->table_driven_params.num_intervals) {
printk(KERN_ERR "invalid table-driven reservation (%u): "
"no intervals\n", config->id);
return -EINVAL;
}
if (config->table_driven_params.num_intervals > MAX_INTERVALS) {
printk(KERN_ERR "invalid table-driven reservation (%u): "
"too many intervals (max: %d)\n", config->id, MAX_INTERVALS);
return -EINVAL;
}
num_slots = config->table_driven_params.num_intervals;
slots_size = sizeof(slots[0]) * num_slots;
mem = kzalloc(sizeof(*td_res) + slots_size, GFP_KERNEL);
if (!mem) {
return -ENOMEM;
} else {
slots = mem + sizeof(*td_res);
td_res = mem;
err = copy_from_user(slots,
config->table_driven_params.intervals, slots_size);
}
if (!err) {
/* sanity checks */
for (i = 0; !err && i < num_slots; i++)
if (slots[i].end <= slots[i].start) {
printk(KERN_ERR
"invalid table-driven reservation (%u): "
"invalid interval %u => [%llu, %llu]\n",
config->id, i,
slots[i].start, slots[i].end);
err = -EINVAL;
}
for (i = 0; !err && i + 1 < num_slots; i++)
if (slots[i + 1].start <= slots[i].end) {
printk(KERN_ERR
"invalid table-driven reservation (%u): "
"overlapping intervals %u, %u\n",
config->id, i, i + 1);
err = -EINVAL;
}
if (slots[num_slots - 1].end >
config->table_driven_params.major_cycle_length) {
printk(KERN_ERR
"invalid table-driven reservation (%u): last "
"interval ends past major cycle %llu > %llu\n",
config->id,
slots[num_slots - 1].end,
config->table_driven_params.major_cycle_length);
err = -EINVAL;
}
}
if (err) {
kfree(td_res);
} else {
table_driven_reservation_init(td_res,
config->table_driven_params.major_cycle_length,
slots, num_slots);
td_res->res.id = config->id;
td_res->res.priority = config->priority;
*_res = &td_res->res;
}
return err;
}
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