The event configuration is domain specific and initialized during domain
initialization. The values are stored in struct rdt_hw_mon_domain.
It is not required to read the configuration register every time user asks
for it. Use the value stored in struct rdt_hw_mon_domain instead.
Introduce resctrl_arch_mon_event_config_get() and
resctrl_arch_mon_event_config_set() to get/set architecture domain specific
mbm_total_cfg/mbm_local_cfg values.
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
v11: Moved the mon_config_info structure definition to internal.h.
Moved resctrl_arch_mon_event_config_get() and resctrl_arch_mon_event_config_set()
to monitor.c file.
Renamed local variable from val to config_val.
v10: Moved the mon_config_info structure definition to resctrl.h.
v9: Removed QOS_L3_OCCUP_EVENT_ID switch case in resctrl_arch_mon_event_config_set.
Fixed a unnecessary space.
v8: Renamed
resctrl_arch_event_config_get() to resctrl_arch_mon_event_config_get().
resctrl_arch_event_config_set() to resctrl_arch_mon_event_config_set().
v7: Removed check if (val == INVALID_CONFIG_VALUE) as resctrl_arch_event_config_get
already prints warning.
Kept the Event config value definitions as is.
v6: Fixed inconstancy with types. Made all the types to u32 for config
value.
Removed few rdt_last_cmd_puts as it is not necessary.
Removed unused config value definitions.
Few more updates to commit message.
v5: Introduced resctrl_arch_event_config_get and
resctrl_arch_event_config_get() based on our discussion.
https://lore.kernel.org/lkml/68e861f9-245d-4496-a72e-46fc57d19c62@xxxxxxx/
v4: New patch.
---
arch/x86/kernel/cpu/resctrl/internal.h | 15 +++++++
arch/x86/kernel/cpu/resctrl/monitor.c | 46 +++++++++++++++++++
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 61 +++++---------------------
3 files changed, 72 insertions(+), 50 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index ab28b9340ee7..cfaea20145d0 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -605,6 +605,18 @@ union cpuid_0x10_x_edx {
unsigned int full;
};
+/**
+ * struct mon_config_info - Monitoring event configuratiin details
+ * @d: Domain for the event
+ * @evtid: Event type
+ * @mon_config: Event configuration value
+ */
+struct mon_config_info {
+ struct rdt_mon_domain *d;
+ enum resctrl_event_id evtid;
+ u32 mon_config;
+};
+
void rdt_last_cmd_clear(void);
void rdt_last_cmd_puts(const char *s);
__printf(1, 2)
@@ -674,4 +686,7 @@ int resctrl_arch_mbm_cntr_assign_set(struct rdt_resource *r, bool enable);
bool resctrl_arch_mbm_cntr_assign_enabled(struct rdt_resource *r);
void arch_mbm_evt_config_init(struct rdt_hw_mon_domain *hw_dom);
unsigned int mon_event_config_index_get(u32 evtid);
+void resctrl_arch_mon_event_config_set(void *info);
+u32 resctrl_arch_mon_event_config_get(struct rdt_mon_domain *d,
+ enum resctrl_event_id eventid);
#endif /* _ASM_X86_RESCTRL_INTERNAL_H */
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 8917c7261680..6fe9e610e9a0 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1324,3 +1324,49 @@ int resctrl_arch_mbm_cntr_assign_set(struct rdt_resource *r, bool enable)
return 0;
}
+
+u32 resctrl_arch_mon_event_config_get(struct rdt_mon_domain *d,
+ enum resctrl_event_id eventid)
+{
+ struct rdt_hw_mon_domain *hw_dom = resctrl_to_arch_mon_dom(d);
+
+ switch (eventid) {
+ case QOS_L3_OCCUP_EVENT_ID:
+ break;
+ case QOS_L3_MBM_TOTAL_EVENT_ID:
+ return hw_dom->mbm_total_cfg;
+ case QOS_L3_MBM_LOCAL_EVENT_ID:
+ return hw_dom->mbm_local_cfg;
+ }
+
+ /* Never expect to get here */
+ WARN_ON_ONCE(1);
+
+ return INVALID_CONFIG_VALUE;
+}
+
+void resctrl_arch_mon_event_config_set(void *info)
+{
+ struct mon_config_info *mon_info = info;
+ struct rdt_hw_mon_domain *hw_dom;
+ unsigned int index;
+
+ index = mon_event_config_index_get(mon_info->evtid);
+ if (index == INVALID_CONFIG_INDEX)
+ return;
+
+ wrmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, 0);
+
+ hw_dom = resctrl_to_arch_mon_dom(mon_info->d);
+
+ switch (mon_info->evtid) {
+ case QOS_L3_MBM_TOTAL_EVENT_ID:
+ hw_dom->mbm_total_cfg = mon_info->mon_config;
+ break;
+ case QOS_L3_MBM_LOCAL_EVENT_ID:
+ hw_dom->mbm_local_cfg = mon_info->mon_config;
+ break;
+ default:
+ break;
+ }
+}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index ddecaa51cec4..18110a1afb6d 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1586,11 +1586,6 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
return ret;
}
-struct mon_config_info {
- u32 evtid;
- u32 mon_config;
-};
-
/**
* mon_event_config_index_get - get the hardware index for the
* configurable event
@@ -1613,33 +1608,11 @@ unsigned int mon_event_config_index_get(u32 evtid)
}
}
-static void mon_event_config_read(void *info)
-{
- struct mon_config_info *mon_info = info;
- unsigned int index;
- u64 msrval;
-
- index = mon_event_config_index_get(mon_info->evtid);
- if (index == INVALID_CONFIG_INDEX) {
- pr_warn_once("Invalid event id %d\n", mon_info->evtid);
- return;
- }
- rdmsrl(MSR_IA32_EVT_CFG_BASE + index, msrval);
-
- /* Report only the valid event configuration bits */
- mon_info->mon_config = msrval & MAX_EVT_CONFIG_BITS;
-}
-
-static void mondata_config_read(struct rdt_mon_domain *d, struct mon_config_info *mon_info)
-{
- smp_call_function_any(&d->hdr.cpu_mask, mon_event_config_read, mon_info, 1);
-}
-
static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
{
- struct mon_config_info mon_info;
struct rdt_mon_domain *dom;
bool sep = false;
+ u32 config_val;
cpus_read_lock();
mutex_lock(&rdtgroup_mutex);
@@ -1648,11 +1621,8 @@ static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid
if (sep)
seq_puts(s, ";");
- memset(&mon_info, 0, sizeof(struct mon_config_info));
- mon_info.evtid = evtid;
- mondata_config_read(dom, &mon_info);
-
- seq_printf(s, "%d=0x%02x", dom->hdr.id, mon_info.mon_config);
+ config_val = resctrl_arch_mon_event_config_get(dom, evtid);
+ seq_printf(s, "%d=0x%02x", dom->hdr.id, config_val);
sep = true;
}
seq_puts(s, "\n");
@@ -1683,33 +1653,23 @@ static int mbm_local_bytes_config_show(struct kernfs_open_file *of,
return 0;
}
-static void mon_event_config_write(void *info)
-{
- struct mon_config_info *mon_info = info;
- unsigned int index;
-
- index = mon_event_config_index_get(mon_info->evtid);
- if (index == INVALID_CONFIG_INDEX) {
- pr_warn_once("Invalid event id %d\n", mon_info->evtid);
- return;
- }
- wrmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, 0);
-}
static void mbm_config_write_domain(struct rdt_resource *r,
struct rdt_mon_domain *d, u32 evtid, u32 val)
{
struct mon_config_info mon_info = {0};
+ u32 config_val;
/*
- * Read the current config value first. If both are the same then
+ * Check the current config value first. If both are the same then
* no need to write it again.
*/
- mon_info.evtid = evtid;
- mondata_config_read(d, &mon_info);
- if (mon_info.mon_config == val)
+ config_val = resctrl_arch_mon_event_config_get(d, evtid);
+ if (config_val == INVALID_CONFIG_VALUE || config_val == val)
return;
+ mon_info.d = d;
+ mon_info.evtid = evtid;
mon_info.mon_config = val;
/*
@@ -1718,7 +1678,8 @@ static void mbm_config_write_domain(struct rdt_resource *r,
* are scoped at the domain level. Writing any of these MSRs
* on one CPU is observed by all the CPUs in the domain.
*/
- smp_call_function_any(&d->hdr.cpu_mask, mon_event_config_write,
+ smp_call_function_any(&d->hdr.cpu_mask,
+ resctrl_arch_mon_event_config_set,
&mon_info, 1);
/*
--
2.34.1
