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Message-ID: <d6e298e9ccbf04207cb352b4f3c9f90613547b52.1728495588.git.babu.moger@amd.com>
Date: Wed, 9 Oct 2024 12:39:37 -0500
From: Babu Moger <babu.moger@....com>
To: <corbet@....net>, <fenghua.yu@...el.com>, <reinette.chatre@...el.com>,
<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
<dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
<rdunlap@...radead.org>, <tj@...nel.org>, <peterz@...radead.org>,
<yanjiewtw@...il.com>, <babu.moger@....com>, <kim.phillips@....com>,
<lukas.bulwahn@...il.com>, <seanjc@...gle.com>, <jmattson@...gle.com>,
<leitao@...ian.org>, <jpoimboe@...nel.org>, <rick.p.edgecombe@...el.com>,
<kirill.shutemov@...ux.intel.com>, <jithu.joseph@...el.com>,
<kai.huang@...el.com>, <kan.liang@...ux.intel.com>,
<daniel.sneddon@...ux.intel.com>, <pbonzini@...hat.com>,
<sandipan.das@....com>, <ilpo.jarvinen@...ux.intel.com>,
<peternewman@...gle.com>, <maciej.wieczor-retman@...el.com>,
<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<eranian@...gle.com>, <james.morse@....com>
Subject: [PATCH v8 12/25] x86/resctrl: Remove MSR reading of event configuration value
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@....com>
---
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@amd.com/
v4: New patch.
---
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 103 ++++++++++++++-----------
include/linux/resctrl.h | 4 +
2 files changed, 62 insertions(+), 45 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 91ffd9d24883..ba90e520150f 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1597,10 +1597,57 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
}
struct mon_config_info {
+ struct rdt_mon_domain *d;
u32 evtid;
u32 mon_config;
};
+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_OCCUP_EVENT_ID:
+ break;
+ 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;
+ }
+}
+
/**
* mon_event_config_index_get - get the hardware index for the
* configurable event
@@ -1623,33 +1670,11 @@ 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 = {0};
struct rdt_mon_domain *dom;
bool sep = false;
+ u32 val;
cpus_read_lock();
mutex_lock(&rdtgroup_mutex);
@@ -1658,11 +1683,8 @@ 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);
+ val = resctrl_arch_mon_event_config_get(dom, evtid);
+ seq_printf(s, "%d=0x%02x", dom->hdr.id, val);
sep = true;
}
seq_puts(s, "\n");
@@ -1693,33 +1715,23 @@ 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;
/*
@@ -1728,7 +1740,8 @@ 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);
/*
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 5a4d6adec974..54eacc8a9d49 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -354,6 +354,10 @@ void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_mon_domain *d,
*/
void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_mon_domain *d);
+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);
+
extern unsigned int resctrl_rmid_realloc_threshold;
extern unsigned int resctrl_rmid_realloc_limit;
--
2.34.1
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