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arm_mpam: resctrl: Add resctrl_arch_cntr_read() & resctrl_arch_reset_cntr()

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When used in 'mbm_event' mode, ABMC emulation, resctrl uses arch hooks to
read and reset the memory bandwidth utilization (MBWU) counters.

Add these.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
James Morse
2026-07-31 18:52:41 +01:00
committed by Will Deacon
parent 6e0e538a75
commit a5ff6ef2d7
1 changed files with 86 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

99
drivers/resctrl/mpam_resctrl.c
View File

@@ -119,19 +119,6 @@ void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_l3_mon_domain *d
{
}
void resctrl_arch_reset_cntr(struct rdt_resource *r, struct rdt_l3_mon_domain *d,
u32 closid, u32 rmid, int cntr_id,
enum resctrl_event_id eventid)
{
}
int resctrl_arch_cntr_read(struct rdt_resource *r, struct rdt_l3_mon_domain *d,
u32 unused, u32 rmid, int cntr_id,
enum resctrl_event_id eventid, u64 *val)
{
return -EOPNOTSUPP;
}
bool resctrl_arch_mbm_cntr_assign_enabled(struct rdt_resource *r)
{
return (r == &mpam_resctrl_controls[RDT_RESOURCE_L3].resctrl_res);
@@ -469,6 +456,14 @@ static int __read_mon(struct mpam_resctrl_mon *mon, struct mpam_component *mon_c
/* Shift closid to account for CDP */
closid = resctrl_get_config_index(closid, cdp_type);
if (mon_idx == USE_PRE_ALLOCATED) {
int mbwu_idx = resctrl_arch_rmid_idx_encode(closid, rmid);
mon_idx = mon->mbwu_idx_to_mon[mbwu_idx];
if (mon_idx == -1)
return -ENOENT;
}
if (irqs_disabled()) {
/* Check if we can access this domain without an IPI */
return -EIO;
@@ -541,6 +536,84 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain_hdr *hdr,
closid, rmid, val);
}
/* MBWU counters when in ABMC mode */
int resctrl_arch_cntr_read(struct rdt_resource *r, struct rdt_l3_mon_domain *d,
u32 closid, u32 rmid, int mon_idx,
enum resctrl_event_id eventid, u64 *val)
{
struct mpam_resctrl_mon *mon = &mpam_resctrl_counters[eventid];
struct mpam_resctrl_dom *l3_dom;
struct mpam_component *mon_comp;
if (!mpam_is_enabled())
return -EINVAL;
if (eventid == QOS_L3_OCCUP_EVENT_ID || !mon->class)
return -EINVAL;
l3_dom = container_of(d, struct mpam_resctrl_dom, resctrl_mon_dom);
mon_comp = l3_dom->mon_comp[eventid];
return read_mon_cdp_safe(mon, mon_comp, mpam_feat_msmon_mbwu,
USE_PRE_ALLOCATED, closid, rmid, val);
}
static void __reset_mon(struct mpam_resctrl_mon *mon, struct mpam_component *mon_comp,
int mon_idx,
enum resctrl_conf_type cdp_type, u32 closid, u32 rmid)
{
struct mon_cfg cfg = { };
if (!mpam_is_enabled())
return;
/* Shift closid to account for CDP */
closid = resctrl_get_config_index(closid, cdp_type);
if (mon_idx == USE_PRE_ALLOCATED) {
int mbwu_idx = resctrl_arch_rmid_idx_encode(closid, rmid);
mon_idx = mon->mbwu_idx_to_mon[mbwu_idx];
}
if (mon_idx == -1)
return;
cfg.mon = mon_idx;
mpam_msmon_reset_mbwu(mon_comp, &cfg);
}
static void reset_mon_cdp_safe(struct mpam_resctrl_mon *mon, struct mpam_component *mon_comp,
int mon_idx, u32 closid, u32 rmid)
{
if (cdp_enabled) {
__reset_mon(mon, mon_comp, mon_idx, CDP_CODE, closid, rmid);
__reset_mon(mon, mon_comp, mon_idx, CDP_DATA, closid, rmid);
} else {
__reset_mon(mon, mon_comp, mon_idx, CDP_NONE, closid, rmid);
}
}
/* Reset an assigned counter */
void resctrl_arch_reset_cntr(struct rdt_resource *r, struct rdt_l3_mon_domain *d,
u32 closid, u32 rmid, int cntr_id,
enum resctrl_event_id eventid)
{
struct mpam_resctrl_mon *mon = &mpam_resctrl_counters[eventid];
struct mpam_resctrl_dom *l3_dom;
struct mpam_component *mon_comp;
if (!mpam_is_enabled())
return;
if (eventid == QOS_L3_OCCUP_EVENT_ID || !mon->class)
return;
l3_dom = container_of(d, struct mpam_resctrl_dom, resctrl_mon_dom);
mon_comp = l3_dom->mon_comp[eventid];
reset_mon_cdp_safe(mon, mon_comp, USE_PRE_ALLOCATED, closid, rmid);
}
/*
* The rmid realloc threshold should be for the smallest cache exposed to
* resctrl.