return val;
}
-static inline struct rmid_entry *__rmid_entry(u32 closid, u32 rmid)
+/*
+ * x86 and arm64 differ in their handling of monitoring.
+ * x86's RMID are independent numbers, there is only one source of traffic
+ * with an RMID value of '1'.
+ * arm64's PMG extends the PARTID/CLOSID space, there are multiple sources of
+ * traffic with a PMG value of '1', one for each CLOSID, meaning the RMID
+ * value is no longer unique.
+ * To account for this, resctrl uses an index. On x86 this is just the RMID,
+ * on arm64 it encodes the CLOSID and RMID. This gives a unique number.
+ *
+ * The domain's rmid_busy_llc and rmid_ptrs[] are sized by index. The arch code
+ * must accept an attempt to read every index.
+ */
+static inline struct rmid_entry *__rmid_entry(u32 idx)
{
struct rmid_entry *entry;
+ u32 closid, rmid;
+
+ entry = &rmid_ptrs[idx];
+ resctrl_arch_rmid_idx_decode(idx, &closid, &rmid);
- entry = &rmid_ptrs[rmid];
- WARN_ON(entry->rmid != rmid);
+ WARN_ON_ONCE(entry->closid != closid);
+ WARN_ON_ONCE(entry->rmid != rmid);
return entry;
}
void __check_limbo(struct rdt_domain *d, bool force_free)
{
struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+ u32 idx_limit = resctrl_arch_system_num_rmid_idx();
struct rmid_entry *entry;
- u32 crmid = 1, nrmid;
+ u32 idx, cur_idx = 1;
bool rmid_dirty;
u64 val = 0;
* RMID and move it to the free list when the counter reaches 0.
*/
for (;;) {
- nrmid = find_next_bit(d->rmid_busy_llc, r->num_rmid, crmid);
- if (nrmid >= r->num_rmid)
+ idx = find_next_bit(d->rmid_busy_llc, idx_limit, cur_idx);
+ if (idx >= idx_limit)
break;
- entry = __rmid_entry(X86_RESCTRL_EMPTY_CLOSID, nrmid);// temporary
-
+ entry = __rmid_entry(idx);
if (resctrl_arch_rmid_read(r, d, entry->closid, entry->rmid,
QOS_L3_OCCUP_EVENT_ID, &val)) {
rmid_dirty = true;
}
if (force_free || !rmid_dirty) {
- clear_bit(entry->rmid, d->rmid_busy_llc);
+ clear_bit(idx, d->rmid_busy_llc);
if (!--entry->busy) {
rmid_limbo_count--;
list_add_tail(&entry->list, &rmid_free_lru);
}
}
- crmid = nrmid + 1;
+ cur_idx = idx + 1;
}
}
-bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d)
+bool has_busy_rmid(struct rdt_domain *d)
{
- return find_first_bit(d->rmid_busy_llc, r->num_rmid) != r->num_rmid;
+ u32 idx_limit = resctrl_arch_system_num_rmid_idx();
+
+ return find_first_bit(d->rmid_busy_llc, idx_limit) != idx_limit;
}
/*
struct rdt_domain *d;
int cpu, err;
u64 val = 0;
+ u32 idx;
+
+ idx = resctrl_arch_rmid_idx_encode(entry->closid, entry->rmid);
entry->busy = 0;
cpu = get_cpu();
* For the first limbo RMID in the domain,
* setup up the limbo worker.
*/
- if (!has_busy_rmid(r, d))
+ if (!has_busy_rmid(d))
cqm_setup_limbo_handler(d, CQM_LIMBOCHECK_INTERVAL);
- set_bit(entry->rmid, d->rmid_busy_llc);
+ set_bit(idx, d->rmid_busy_llc);
entry->busy++;
}
put_cpu();
void free_rmid(u32 closid, u32 rmid)
{
+ u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
struct rmid_entry *entry;
- if (!rmid)
- return;
-
lockdep_assert_held(&rdtgroup_mutex);
- entry = __rmid_entry(closid, rmid);
+ /*
+ * Do not allow the default rmid to be free'd. Comparing by index
+ * allows architectures that ignore the closid parameter to avoid an
+ * unnecessary check.
+ */
+ if (idx == resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
+ RESCTRL_RESERVED_RMID))
+ return;
+
+ entry = __rmid_entry(idx);
if (is_llc_occupancy_enabled())
add_rmid_to_limbo(entry);
static struct mbm_state *get_mbm_state(struct rdt_domain *d, u32 closid,
u32 rmid, enum resctrl_event_id evtid)
{
+ u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+
switch (evtid) {
case QOS_L3_MBM_TOTAL_EVENT_ID:
- return &d->mbm_total[rmid];
+ return &d->mbm_total[idx];
case QOS_L3_MBM_LOCAL_EVENT_ID:
- return &d->mbm_local[rmid];
+ return &d->mbm_local[idx];
default:
return NULL;
}
*/
static void mbm_bw_count(u32 closid, u32 rmid, struct rmid_read *rr)
{
- struct mbm_state *m = &rr->d->mbm_local[rmid];
+ u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+ struct mbm_state *m = &rr->d->mbm_local[idx];
u64 cur_bw, bytes, cur_bytes;
cur_bytes = rr->val;
struct mbm_state *pmbm_data, *cmbm_data;
struct rdt_resource *r_mba;
struct rdt_domain *dom_mba;
+ u32 cur_bw, user_bw, idx;
struct list_head *head;
struct rdtgroup *entry;
- u32 cur_bw, user_bw;
if (!is_mbm_local_enabled())
return;
closid = rgrp->closid;
rmid = rgrp->mon.rmid;
- pmbm_data = &dom_mbm->mbm_local[rmid];
+ idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+ pmbm_data = &dom_mbm->mbm_local[idx];
dom_mba = get_domain_from_cpu(smp_processor_id(), r_mba);
if (!dom_mba) {
{
unsigned long delay = msecs_to_jiffies(CQM_LIMBOCHECK_INTERVAL);
int cpu = smp_processor_id();
- struct rdt_resource *r;
struct rdt_domain *d;
mutex_lock(&rdtgroup_mutex);
- r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
d = container_of(work, struct rdt_domain, cqm_limbo.work);
__check_limbo(d, false);
- if (has_busy_rmid(r, d))
+ if (has_busy_rmid(d))
schedule_delayed_work_on(cpu, &d->cqm_limbo, delay);
mutex_unlock(&rdtgroup_mutex);
static int dom_data_init(struct rdt_resource *r)
{
+ u32 idx_limit = resctrl_arch_system_num_rmid_idx();
struct rmid_entry *entry = NULL;
- int i, nr_rmids;
+ u32 idx;
+ int i;
- nr_rmids = r->num_rmid;
- rmid_ptrs = kcalloc(nr_rmids, sizeof(struct rmid_entry), GFP_KERNEL);
+ rmid_ptrs = kcalloc(idx_limit, sizeof(struct rmid_entry), GFP_KERNEL);
if (!rmid_ptrs)
return -ENOMEM;
- for (i = 0; i < nr_rmids; i++) {
+ for (i = 0; i < idx_limit; i++) {
entry = &rmid_ptrs[i];
INIT_LIST_HEAD(&entry->list);
- entry->rmid = i;
+ resctrl_arch_rmid_idx_decode(i, &entry->closid, &entry->rmid);
list_add_tail(&entry->list, &rmid_free_lru);
}
* are always allocated. These are used for the rdtgroup_default
* control group, which will be setup later in rdtgroup_init().
*/
- entry = __rmid_entry(RESCTRL_RESERVED_CLOSID, RESCTRL_RESERVED_RMID);
+ idx = resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
+ RESCTRL_RESERVED_RMID);
+ entry = __rmid_entry(idx);
list_del(&entry->list);
return 0;
{
mutex_lock(&rdtgroup_mutex);
- rdtgroup_default.closid = 0;
- rdtgroup_default.mon.rmid = 0;
+ rdtgroup_default.closid = RESCTRL_RESERVED_CLOSID;
+ rdtgroup_default.mon.rmid = RESCTRL_RESERVED_RMID;
rdtgroup_default.type = RDTCTRL_GROUP;
INIT_LIST_HEAD(&rdtgroup_default.mon.crdtgrp_list);
if (is_mbm_enabled())
cancel_delayed_work(&d->mbm_over);
- if (is_llc_occupancy_enabled() && has_busy_rmid(r, d)) {
+ if (is_llc_occupancy_enabled() && has_busy_rmid(d)) {
/*
* When a package is going down, forcefully
* decrement rmid->ebusy. There is no way to know
static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
{
+ u32 idx_limit = resctrl_arch_system_num_rmid_idx();
size_t tsize;
if (is_llc_occupancy_enabled()) {
- d->rmid_busy_llc = bitmap_zalloc(r->num_rmid, GFP_KERNEL);
+ d->rmid_busy_llc = bitmap_zalloc(idx_limit, GFP_KERNEL);
if (!d->rmid_busy_llc)
return -ENOMEM;
}
if (is_mbm_total_enabled()) {
tsize = sizeof(*d->mbm_total);
- d->mbm_total = kcalloc(r->num_rmid, tsize, GFP_KERNEL);
+ d->mbm_total = kcalloc(idx_limit, tsize, GFP_KERNEL);
if (!d->mbm_total) {
bitmap_free(d->rmid_busy_llc);
return -ENOMEM;
}
if (is_mbm_local_enabled()) {
tsize = sizeof(*d->mbm_local);
- d->mbm_local = kcalloc(r->num_rmid, tsize, GFP_KERNEL);
+ d->mbm_local = kcalloc(idx_limit, tsize, GFP_KERNEL);
if (!d->mbm_local) {
bitmap_free(d->rmid_busy_llc);
kfree(d->mbm_total);