diff mbox series

[v7,06/12] x86/resctrl: Introduce data structure to support monitor configuration

Message ID 166604560666.5345.17936133716540279017.stgit@bmoger-ubuntu
State New
Headers
Series x86/resctrl: Support for AMD QoS new features |

Commit Message

Moger, Babu Oct. 17, 2022, 10:26 p.m. UTC 
  Add a new field in mon_evt to support Bandwidth Monitoring Event
Configuration(BMEC) and also update the "mon_features" display.

The sysfs file "mon_features" will display the monitor configuration
if supported.

Before the change.
	$cat /sys/fs/resctrl/info/L3_MON/mon_features
	llc_occupancy
	mbm_total_bytes
	mbm_local_bytes

After the change if BMEC is supported.
	$cat /sys/fs/resctrl/info/L3_MON/mon_features
	llc_occupancy
	mbm_total_bytes
	mbm_total_config
	mbm_local_bytes
	mbm_local_config

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     |    3 ++-
 arch/x86/kernel/cpu/resctrl/internal.h |    4 +++-
 arch/x86/kernel/cpu/resctrl/monitor.c  |    7 ++++++-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |    5 ++++-
 4 files changed, 15 insertions(+), 4 deletions(-)

Comments

Reinette Chatre Oct. 25, 2022, 11:45 p.m. UTC | #1 
Hi Babu,

On 10/17/2022 3:26 PM, Babu Moger wrote:
> Add a new field in mon_evt to support Bandwidth Monitoring Event
> Configuration(BMEC) and also update the "mon_features" display.
> 
> The sysfs file "mon_features" will display the monitor configuration
> if supported.
> 
> Before the change.
> 	$cat /sys/fs/resctrl/info/L3_MON/mon_features
> 	llc_occupancy
> 	mbm_total_bytes
> 	mbm_local_bytes
> 
> After the change if BMEC is supported.
> 	$cat /sys/fs/resctrl/info/L3_MON/mon_features
> 	llc_occupancy
> 	mbm_total_bytes
> 	mbm_total_config
> 	mbm_local_bytes
> 	mbm_local_config

This does not seem to be what the code in this patch does.

> 
> Signed-off-by: Babu Moger <babu.moger@amd.com>
> ---
>  arch/x86/kernel/cpu/resctrl/core.c     |    3 ++-
>  arch/x86/kernel/cpu/resctrl/internal.h |    4 +++-
>  arch/x86/kernel/cpu/resctrl/monitor.c  |    7 ++++++-
>  arch/x86/kernel/cpu/resctrl/rdtgroup.c |    5 ++++-
>  4 files changed, 15 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
> index d79f494a4e91..46813b1c50c2 100644
> --- a/arch/x86/kernel/cpu/resctrl/core.c
> +++ b/arch/x86/kernel/cpu/resctrl/core.c
> @@ -814,6 +814,7 @@ static __init bool get_rdt_alloc_resources(void)
>  static __init bool get_rdt_mon_resources(void)
>  {
>  	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
> +	bool mon_configurable = rdt_cpu_has(X86_FEATURE_BMEC);
>  
>  	if (rdt_cpu_has(X86_FEATURE_CQM_OCCUP_LLC))
>  		rdt_mon_features |= (1 << QOS_L3_OCCUP_EVENT_ID);
> @@ -825,7 +826,7 @@ static __init bool get_rdt_mon_resources(void)
>  	if (!rdt_mon_features)
>  		return false;
>  
> -	return !rdt_get_mon_l3_config(r);
> +	return !rdt_get_mon_l3_config(r, mon_configurable);
>  }

This seems to do a portion of configuration in the calling function, pass the
results of to the actual configuration function where the rest of the configuration is
done. Determining "mon_configurable" really looks like it belongs in 
rdt_get_mon_l3_config(). Is it availability of rdt_cpu_has() that prevented
that change? Why not make it available internally to all resctrl code?

Patch 7's mbm_config_rftype_init() can also be moved to rdt_get_mon_l3_config()
to match how other related configs (thread_throttle_mode_init()) are done.

>  
>  static __init void __check_quirks_intel(void)
> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
> index 16e3c6e03c79..b458f768f30c 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -63,11 +63,13 @@ DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key);
>   * struct mon_evt - Entry in the event list of a resource
>   * @evtid:		event id
>   * @name:		name of the event
> + * @configurable:	true if the event is configurable
>   * @list:		entry in &rdt_resource->evt_list
>   */
>  struct mon_evt {
>  	enum resctrl_event_id	evtid;
>  	char			*name;
> +	bool			configurable;
>  	struct list_head	list;
>  };
>  
> @@ -522,7 +524,7 @@ int closids_supported(void);
>  void closid_free(int closid);
>  int alloc_rmid(void);
>  void free_rmid(u32 rmid);
> -int rdt_get_mon_l3_config(struct rdt_resource *r);
> +int rdt_get_mon_l3_config(struct rdt_resource *r, bool configurable);
>  void mon_event_count(void *info);
>  int rdtgroup_mondata_show(struct seq_file *m, void *arg);
>  void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
> diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
> index efe0c30d3a12..4b8adb7f1c5c 100644
> --- a/arch/x86/kernel/cpu/resctrl/monitor.c
> +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
> @@ -746,7 +746,7 @@ static void l3_mon_evt_init(struct rdt_resource *r)
>  		list_add_tail(&mbm_local_event.list, &r->evt_list);
>  }
>  
> -int rdt_get_mon_l3_config(struct rdt_resource *r)
> +int rdt_get_mon_l3_config(struct rdt_resource *r, bool configurable)
>  {
>  	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
>  	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
> @@ -783,6 +783,11 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)
>  	if (ret)
>  		return ret;
>  
> +	if (configurable) {
> +		mbm_total_event.configurable = true;
> +		mbm_local_event.configurable = true;
> +	}
> +
>  	l3_mon_evt_init(r);
>  
>  	r->mon_capable = true;
> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> index 1271fd1ae2f3..5f0ef1bf4c78 100644
> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> @@ -1001,8 +1001,11 @@ static int rdt_mon_features_show(struct kernfs_open_file *of,
>  	struct rdt_resource *r = of->kn->parent->priv;
>  	struct mon_evt *mevt;
>  
> -	list_for_each_entry(mevt, &r->evt_list, list)
> +	list_for_each_entry(mevt, &r->evt_list, list) {
>  		seq_printf(seq, "%s\n", mevt->name);
> +		if (mevt->configurable)
> +			seq_printf(seq, "%s_config\n", mevt->name);
> +	}
>  
>  	return 0;
>  }
> 

If mevt->name is "mbm_total_bytes", then would this not
print "mbm_total_bytes_config"? This is different from "mbm_total_config"
in the changelog and does not match the actual files created in later
patches..

Reinette
Moger, Babu Oct. 26, 2022, 7:25 p.m. UTC | #2 
Hi Reinette,

On 10/25/22 18:45, Reinette Chatre wrote:
> Hi Babu,
>
> On 10/17/2022 3:26 PM, Babu Moger wrote:
>> Add a new field in mon_evt to support Bandwidth Monitoring Event
>> Configuration(BMEC) and also update the "mon_features" display.
>>
>> The sysfs file "mon_features" will display the monitor configuration
>> if supported.
>>
>> Before the change.
>> 	$cat /sys/fs/resctrl/info/L3_MON/mon_features
>> 	llc_occupancy
>> 	mbm_total_bytes
>> 	mbm_local_bytes
>>
>> After the change if BMEC is supported.
>> 	$cat /sys/fs/resctrl/info/L3_MON/mon_features
>> 	llc_occupancy
>> 	mbm_total_bytes
>> 	mbm_total_config
>> 	mbm_local_bytes
>> 	mbm_local_config
> This does not seem to be what the code in this patch does.

You are right. it is

# cat /sys/fs/resctrl/info/L3_MON/mon_features
llc_occupancy
mbm_total_bytes
mbm_total_bytes_config
mbm_local_bytes
mbm_local_bytes_config

>
>> Signed-off-by: Babu Moger <babu.moger@amd.com>
>> ---
>>  arch/x86/kernel/cpu/resctrl/core.c     |    3 ++-
>>  arch/x86/kernel/cpu/resctrl/internal.h |    4 +++-
>>  arch/x86/kernel/cpu/resctrl/monitor.c  |    7 ++++++-
>>  arch/x86/kernel/cpu/resctrl/rdtgroup.c |    5 ++++-
>>  4 files changed, 15 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
>> index d79f494a4e91..46813b1c50c2 100644
>> --- a/arch/x86/kernel/cpu/resctrl/core.c
>> +++ b/arch/x86/kernel/cpu/resctrl/core.c
>> @@ -814,6 +814,7 @@ static __init bool get_rdt_alloc_resources(void)
>>  static __init bool get_rdt_mon_resources(void)
>>  {
>>  	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
>> +	bool mon_configurable = rdt_cpu_has(X86_FEATURE_BMEC);
>>  
>>  	if (rdt_cpu_has(X86_FEATURE_CQM_OCCUP_LLC))
>>  		rdt_mon_features |= (1 << QOS_L3_OCCUP_EVENT_ID);
>> @@ -825,7 +826,7 @@ static __init bool get_rdt_mon_resources(void)
>>  	if (!rdt_mon_features)
>>  		return false;
>>  
>> -	return !rdt_get_mon_l3_config(r);
>> +	return !rdt_get_mon_l3_config(r, mon_configurable);
>>  }
> This seems to do a portion of configuration in the calling function, pass the
> results of to the actual configuration function where the rest of the configuration is
> done. Determining "mon_configurable" really looks like it belongs in 
> rdt_get_mon_l3_config(). Is it availability of rdt_cpu_has() that prevented
> that change? Why not make it available internally to all resctrl code?

Yes. It is because of rdt_cpu_has availability. Also, it is __init routine.

Yes. I can make it available.

>
> Patch 7's mbm_config_rftype_init() can also be moved to rdt_get_mon_l3_config()
> to match how other related configs (thread_throttle_mode_init()) are done.
Sure. Will do.
>
>>  
>>  static __init void __check_quirks_intel(void)
>> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
>> index 16e3c6e03c79..b458f768f30c 100644
>> --- a/arch/x86/kernel/cpu/resctrl/internal.h
>> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
>> @@ -63,11 +63,13 @@ DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key);
>>   * struct mon_evt - Entry in the event list of a resource
>>   * @evtid:		event id
>>   * @name:		name of the event
>> + * @configurable:	true if the event is configurable
>>   * @list:		entry in &rdt_resource->evt_list
>>   */
>>  struct mon_evt {
>>  	enum resctrl_event_id	evtid;
>>  	char			*name;
>> +	bool			configurable;
>>  	struct list_head	list;
>>  };
>>  
>> @@ -522,7 +524,7 @@ int closids_supported(void);
>>  void closid_free(int closid);
>>  int alloc_rmid(void);
>>  void free_rmid(u32 rmid);
>> -int rdt_get_mon_l3_config(struct rdt_resource *r);
>> +int rdt_get_mon_l3_config(struct rdt_resource *r, bool configurable);
>>  void mon_event_count(void *info);
>>  int rdtgroup_mondata_show(struct seq_file *m, void *arg);
>>  void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
>> diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
>> index efe0c30d3a12..4b8adb7f1c5c 100644
>> --- a/arch/x86/kernel/cpu/resctrl/monitor.c
>> +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
>> @@ -746,7 +746,7 @@ static void l3_mon_evt_init(struct rdt_resource *r)
>>  		list_add_tail(&mbm_local_event.list, &r->evt_list);
>>  }
>>  
>> -int rdt_get_mon_l3_config(struct rdt_resource *r)
>> +int rdt_get_mon_l3_config(struct rdt_resource *r, bool configurable)
>>  {
>>  	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
>>  	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
>> @@ -783,6 +783,11 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)
>>  	if (ret)
>>  		return ret;
>>  
>> +	if (configurable) {
>> +		mbm_total_event.configurable = true;
>> +		mbm_local_event.configurable = true;
>> +	}
>> +
>>  	l3_mon_evt_init(r);
>>  
>>  	r->mon_capable = true;
>> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>> index 1271fd1ae2f3..5f0ef1bf4c78 100644
>> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>> @@ -1001,8 +1001,11 @@ static int rdt_mon_features_show(struct kernfs_open_file *of,
>>  	struct rdt_resource *r = of->kn->parent->priv;
>>  	struct mon_evt *mevt;
>>  
>> -	list_for_each_entry(mevt, &r->evt_list, list)
>> +	list_for_each_entry(mevt, &r->evt_list, list) {
>>  		seq_printf(seq, "%s\n", mevt->name);
>> +		if (mevt->configurable)
>> +			seq_printf(seq, "%s_config\n", mevt->name);
>> +	}
>>  
>>  	return 0;
>>  }
>>
> If mevt->name is "mbm_total_bytes", then would this not
> print "mbm_total_bytes_config"? This is different from "mbm_total_config"
> in the changelog and does not match the actual files created in later
> patches..

Sure. Will update the changelog,

Thanks

Babu
diff mbox series

Patch

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index d79f494a4e91..46813b1c50c2 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -814,6 +814,7 @@  static __init bool get_rdt_alloc_resources(void)
 static __init bool get_rdt_mon_resources(void)
 {
 	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+	bool mon_configurable = rdt_cpu_has(X86_FEATURE_BMEC);
 
 	if (rdt_cpu_has(X86_FEATURE_CQM_OCCUP_LLC))
 		rdt_mon_features |= (1 << QOS_L3_OCCUP_EVENT_ID);
@@ -825,7 +826,7 @@  static __init bool get_rdt_mon_resources(void)
 	if (!rdt_mon_features)
 		return false;
 
-	return !rdt_get_mon_l3_config(r);
+	return !rdt_get_mon_l3_config(r, mon_configurable);
 }
 
 static __init void __check_quirks_intel(void)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 16e3c6e03c79..b458f768f30c 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -63,11 +63,13 @@  DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key);
  * struct mon_evt - Entry in the event list of a resource
  * @evtid:		event id
  * @name:		name of the event
+ * @configurable:	true if the event is configurable
  * @list:		entry in &rdt_resource->evt_list
  */
 struct mon_evt {
 	enum resctrl_event_id	evtid;
 	char			*name;
+	bool			configurable;
 	struct list_head	list;
 };
 
@@ -522,7 +524,7 @@  int closids_supported(void);
 void closid_free(int closid);
 int alloc_rmid(void);
 void free_rmid(u32 rmid);
-int rdt_get_mon_l3_config(struct rdt_resource *r);
+int rdt_get_mon_l3_config(struct rdt_resource *r, bool configurable);
 void mon_event_count(void *info);
 int rdtgroup_mondata_show(struct seq_file *m, void *arg);
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index efe0c30d3a12..4b8adb7f1c5c 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -746,7 +746,7 @@  static void l3_mon_evt_init(struct rdt_resource *r)
 		list_add_tail(&mbm_local_event.list, &r->evt_list);
 }
 
-int rdt_get_mon_l3_config(struct rdt_resource *r)
+int rdt_get_mon_l3_config(struct rdt_resource *r, bool configurable)
 {
 	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
@@ -783,6 +783,11 @@  int rdt_get_mon_l3_config(struct rdt_resource *r)
 	if (ret)
 		return ret;
 
+	if (configurable) {
+		mbm_total_event.configurable = true;
+		mbm_local_event.configurable = true;
+	}
+
 	l3_mon_evt_init(r);
 
 	r->mon_capable = true;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 1271fd1ae2f3..5f0ef1bf4c78 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1001,8 +1001,11 @@  static int rdt_mon_features_show(struct kernfs_open_file *of,
 	struct rdt_resource *r = of->kn->parent->priv;
 	struct mon_evt *mevt;
 
-	list_for_each_entry(mevt, &r->evt_list, list)
+	list_for_each_entry(mevt, &r->evt_list, list) {
 		seq_printf(seq, "%s\n", mevt->name);
+		if (mevt->configurable)
+			seq_printf(seq, "%s_config\n", mevt->name);
+	}
 
 	return 0;
 }