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-rw-r--r--arch/x86/include/asm/resctrl.h17
-rw-r--r--arch/x86/kernel/cpu/resctrl/core.c13
-rw-r--r--arch/x86/kernel/cpu/resctrl/internal.h4
-rw-r--r--arch/x86/kernel/cpu/resctrl/monitor.c98
-rw-r--r--arch/x86/kernel/cpu/resctrl/rdtgroup.c13
5 files changed, 100 insertions, 45 deletions
diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index cc6e1bce7b1a..db4c84dde2d5 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -101,6 +101,23 @@ static inline void resctrl_sched_in(struct task_struct *tsk)
__resctrl_sched_in(tsk);
}
+static inline u32 resctrl_arch_system_num_rmid_idx(void)
+{
+ /* RMID are independent numbers for x86. num_rmid_idx == num_rmid */
+ return boot_cpu_data.x86_cache_max_rmid + 1;
+}
+
+static inline void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid)
+{
+ *rmid = idx;
+ *closid = X86_RESCTRL_EMPTY_CLOSID;
+}
+
+static inline u32 resctrl_arch_rmid_idx_encode(u32 ignored, u32 rmid)
+{
+ return rmid;
+}
+
void resctrl_cpu_detect(struct cpuinfo_x86 *c);
#else
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 9641c42d0f85..d1dc80a21ea9 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -587,7 +587,7 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
mbm_setup_overflow_handler(d, 0);
}
if (is_llc_occupancy_enabled() && cpu == d->cqm_work_cpu &&
- has_busy_rmid(r, d)) {
+ has_busy_rmid(d)) {
cancel_delayed_work(&d->cqm_limbo);
cqm_setup_limbo_handler(d, 0);
}
@@ -598,11 +598,12 @@ static void clear_closid_rmid(int cpu)
{
struct resctrl_pqr_state *state = this_cpu_ptr(&pqr_state);
- state->default_closid = 0;
- state->default_rmid = 0;
- state->cur_closid = 0;
- state->cur_rmid = 0;
- wrmsr(MSR_IA32_PQR_ASSOC, 0, 0);
+ state->default_closid = RESCTRL_RESERVED_CLOSID;
+ state->default_rmid = RESCTRL_RESERVED_RMID;
+ state->cur_closid = RESCTRL_RESERVED_CLOSID;
+ state->cur_rmid = RESCTRL_RESERVED_RMID;
+ wrmsr(MSR_IA32_PQR_ASSOC, RESCTRL_RESERVED_RMID,
+ RESCTRL_RESERVED_CLOSID);
}
static int resctrl_online_cpu(unsigned int cpu)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index ae0e3338abc4..cbba782acd0c 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -8,6 +8,8 @@
#include <linux/fs_context.h>
#include <linux/jump_label.h>
+#include <asm/resctrl.h>
+
#define L3_QOS_CDP_ENABLE 0x01ULL
#define L2_QOS_CDP_ENABLE 0x01ULL
@@ -558,7 +560,7 @@ void __init intel_rdt_mbm_apply_quirk(void);
bool is_mba_sc(struct rdt_resource *r);
void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms);
void cqm_handle_limbo(struct work_struct *work);
-bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d);
+bool has_busy_rmid(struct rdt_domain *d);
void __check_limbo(struct rdt_domain *d, bool force_free);
void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
void __init thread_throttle_mode_init(void);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 3dad4134d2c9..bc5ceef143ab 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -149,12 +149,29 @@ static inline u64 get_corrected_mbm_count(u32 rmid, unsigned long val)
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;
}
@@ -284,8 +301,9 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
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;
@@ -296,12 +314,11 @@ void __check_limbo(struct rdt_domain *d, bool force_free)
* 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;
@@ -310,19 +327,21 @@ void __check_limbo(struct rdt_domain *d, bool force_free)
}
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;
}
/*
@@ -352,6 +371,9 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
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();
@@ -369,9 +391,9 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
* 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();
@@ -384,14 +406,21 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
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);
@@ -402,11 +431,13 @@ void free_rmid(u32 closid, u32 rmid)
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;
}
@@ -449,7 +480,8 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
*/
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;
@@ -538,9 +570,9 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
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;
@@ -549,7 +581,8 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
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) {
@@ -638,17 +671,15 @@ void cqm_handle_limbo(struct work_struct *work)
{
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);
@@ -713,19 +744,20 @@ void mbm_setup_overflow_handler(struct rdt_domain *dom, unsigned long delay_ms)
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);
}
@@ -734,7 +766,9 @@ static int dom_data_init(struct rdt_resource *r)
* 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;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index ad7da7254f4d..a7dbc0e7e559 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -3853,8 +3853,8 @@ static void __init rdtgroup_setup_default(void)
{
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);
@@ -3889,7 +3889,7 @@ void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
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
@@ -3907,16 +3907,17 @@ void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
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;
@@ -3924,7 +3925,7 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
}
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);
generated by cgit v1.2.3 (git 2.39.0) at 2024-10-07 13:19:13 +0300