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[PATCH 6/7] x86/resctrl: Introduce interface to display SDCIAE Capacity Bit Masks

Babu Moger posted 7 patches 1 year, 5 months ago
There is a newer version of this series
[PATCH 6/7] x86/resctrl: Introduce interface to display SDCIAE Capacity Bit Masks
Posted by Babu Moger 1 year, 5 months ago 
When enabled, SDCIAE forces all SDCI lines to be placed into the L3 cache
partitions identified by the highest-supported L3_MASK_n register where
n is the maximum CLOSID supported.

Add the interface to display CBMs (Capacity Bit Mask) of the SDCIAE.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  2 +-
 arch/x86/kernel/cpu/resctrl/internal.h    |  1 +
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 29 +++++++++++++++++++++++
 3 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 50fa1fe9a073..fc99f4d17e6c 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -439,7 +439,7 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
 	return hw_dom->ctrl_val[idx];
 }
 
-static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
+void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
 {
 	struct rdt_resource *r = schema->res;
 	struct rdt_ctrl_domain *dom;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 9a3da6d49144..f2c87ca37b13 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -663,6 +663,7 @@ void __init thread_throttle_mode_init(void);
 void __init mbm_config_rftype_init(const char *config);
 void rdt_staged_configs_clear(void);
 void __init resctrl_sdciae_rftype_init(void);
+void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid);
 bool closid_allocated(unsigned int closid);
 int resctrl_find_cleanest_closid(void);
 
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 58e4df195207..51bc715bb6ae 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1922,6 +1922,25 @@ static ssize_t resctrl_sdciae_write(struct kernfs_open_file *of, char *buf,
 	return ret ?: nbytes;
 }
 
+static int resctrl_sdciae_cbm_show(struct kernfs_open_file *of,
+				   struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
+	u32 sdciae_closid;
+
+	if (!resctrl_arch_get_sdciae_enabled(RDT_RESOURCE_L3)) {
+		rdt_last_cmd_puts("SDCIAE is not enabled\n");
+		return -EINVAL;
+	}
+
+	sdciae_closid = get_sdciae_closid(r);
+
+	show_doms(seq, s, sdciae_closid);
+
+	return 0;
+}
+
 /* rdtgroup information files for one cache resource. */
 static struct rftype res_common_files[] = {
 	{
@@ -2081,6 +2100,12 @@ static struct rftype res_common_files[] = {
 		.seq_show	= resctrl_sdciae_show,
 		.write		= resctrl_sdciae_write,
 	},
+	{
+		.name		= "sdciae_cbm",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= resctrl_sdciae_cbm_show,
+	},
 	{
 		.name		= "mode",
 		.mode		= 0644,
@@ -2187,6 +2212,10 @@ void __init resctrl_sdciae_rftype_init(void)
 	rft = rdtgroup_get_rftype_by_name("sdciae");
 	if (rft)
 		rft->fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE;
+
+	rft = rdtgroup_get_rftype_by_name("sdciae_cbm");
+	if (rft)
+		rft->fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE;
 }
 
 /**
-- 
2.34.1
Re: [PATCH 6/7] x86/resctrl: Introduce interface to display SDCIAE Capacity Bit Masks
Posted by Reinette Chatre 1 year, 4 months ago 
Hi Babu,

On 8/16/24 9:16 AM, Babu Moger wrote:
> When enabled, SDCIAE forces all SDCI lines to be placed into the L3 cache
> partitions identified by the highest-supported L3_MASK_n register where
> n is the maximum CLOSID supported.
> 
> Add the interface to display CBMs (Capacity Bit Mask) of the SDCIAE.
> 
> Signed-off-by: Babu Moger <babu.moger@amd.com>
> ---
>   arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  2 +-
>   arch/x86/kernel/cpu/resctrl/internal.h    |  1 +
>   arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 29 +++++++++++++++++++++++
>   3 files changed, 31 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
> index 50fa1fe9a073..fc99f4d17e6c 100644
> --- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
> +++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
> @@ -439,7 +439,7 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
>   	return hw_dom->ctrl_val[idx];
>   }
>   
> -static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
> +void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
>   {
>   	struct rdt_resource *r = schema->res;
>   	struct rdt_ctrl_domain *dom;
> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
> index 9a3da6d49144..f2c87ca37b13 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -663,6 +663,7 @@ void __init thread_throttle_mode_init(void);
>   void __init mbm_config_rftype_init(const char *config);
>   void rdt_staged_configs_clear(void);
>   void __init resctrl_sdciae_rftype_init(void);
> +void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid);
>   bool closid_allocated(unsigned int closid);
>   int resctrl_find_cleanest_closid(void);
>   
> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> index 58e4df195207..51bc715bb6ae 100644
> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> @@ -1922,6 +1922,25 @@ static ssize_t resctrl_sdciae_write(struct kernfs_open_file *of, char *buf,
>   	return ret ?: nbytes;
>   }
>   
> +static int resctrl_sdciae_cbm_show(struct kernfs_open_file *of,
> +				   struct seq_file *seq, void *v)
> +{
> +	struct resctrl_schema *s = of->kn->parent->priv;
> +	struct rdt_resource *r = s->res;
> +	u32 sdciae_closid;
> +
> +	if (!resctrl_arch_get_sdciae_enabled(RDT_RESOURCE_L3)) {

(same issue with this file appearing in all cache resources, eg. L2)

> +		rdt_last_cmd_puts("SDCIAE is not enabled\n");
> +		return -EINVAL;
> +	}
> +
> +	sdciae_closid = get_sdciae_closid(r);
> +
> +	show_doms(seq, s, sdciae_closid);
> +
> +	return 0;
> +}

This really needs protection. (You should have encountered warnings
via lockdep_assert_held(&rdtgroup_mutex) and lockdep_assert_cpus_held()
found in the functions called.)

> +
>   /* rdtgroup information files for one cache resource. */
>   static struct rftype res_common_files[] = {
>   	{
> @@ -2081,6 +2100,12 @@ static struct rftype res_common_files[] = {
>   		.seq_show	= resctrl_sdciae_show,
>   		.write		= resctrl_sdciae_write,
>   	},
> +	{
> +		.name		= "sdciae_cbm",
> +		.mode		= 0444,
> +		.kf_ops		= &rdtgroup_kf_single_ops,
> +		.seq_show	= resctrl_sdciae_cbm_show,
> +	},
>   	{
>   		.name		= "mode",
>   		.mode		= 0644,
> @@ -2187,6 +2212,10 @@ void __init resctrl_sdciae_rftype_init(void)
>   	rft = rdtgroup_get_rftype_by_name("sdciae");
>   	if (rft)
>   		rft->fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE;
> +
> +	rft = rdtgroup_get_rftype_by_name("sdciae_cbm");
> +	if (rft)
> +		rft->fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE;
>   }
>   
>   /**

Reinette
Re: [PATCH 6/7] x86/resctrl: Introduce interface to display SDCIAE Capacity Bit Masks
Posted by Moger, Babu 1 year, 4 months ago 
Hi Reinette,

On 9/13/24 15:52, Reinette Chatre wrote:
> Hi Babu,
> 
> On 8/16/24 9:16 AM, Babu Moger wrote:
>> When enabled, SDCIAE forces all SDCI lines to be placed into the L3 cache
>> partitions identified by the highest-supported L3_MASK_n register where
>> n is the maximum CLOSID supported.
>>
>> Add the interface to display CBMs (Capacity Bit Mask) of the SDCIAE.
>>
>> Signed-off-by: Babu Moger <babu.moger@amd.com>
>> ---
>>   arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  2 +-
>>   arch/x86/kernel/cpu/resctrl/internal.h    |  1 +
>>   arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 29 +++++++++++++++++++++++
>>   3 files changed, 31 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
>> b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
>> index 50fa1fe9a073..fc99f4d17e6c 100644
>> --- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
>> +++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
>> @@ -439,7 +439,7 @@ u32 resctrl_arch_get_config(struct rdt_resource *r,
>> struct rdt_ctrl_domain *d,
>>       return hw_dom->ctrl_val[idx];
>>   }
>>   -static void show_doms(struct seq_file *s, struct resctrl_schema
>> *schema, int closid)
>> +void show_doms(struct seq_file *s, struct resctrl_schema *schema, int
>> closid)
>>   {
>>       struct rdt_resource *r = schema->res;
>>       struct rdt_ctrl_domain *dom;
>> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h
>> b/arch/x86/kernel/cpu/resctrl/internal.h
>> index 9a3da6d49144..f2c87ca37b13 100644
>> --- a/arch/x86/kernel/cpu/resctrl/internal.h
>> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
>> @@ -663,6 +663,7 @@ void __init thread_throttle_mode_init(void);
>>   void __init mbm_config_rftype_init(const char *config);
>>   void rdt_staged_configs_clear(void);
>>   void __init resctrl_sdciae_rftype_init(void);
>> +void show_doms(struct seq_file *s, struct resctrl_schema *schema, int
>> closid);
>>   bool closid_allocated(unsigned int closid);
>>   int resctrl_find_cleanest_closid(void);
>>   diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>> b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>> index 58e4df195207..51bc715bb6ae 100644
>> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>> @@ -1922,6 +1922,25 @@ static ssize_t resctrl_sdciae_write(struct
>> kernfs_open_file *of, char *buf,
>>       return ret ?: nbytes;
>>   }
>>   +static int resctrl_sdciae_cbm_show(struct kernfs_open_file *of,
>> +                   struct seq_file *seq, void *v)
>> +{
>> +    struct resctrl_schema *s = of->kn->parent->priv;
>> +    struct rdt_resource *r = s->res;
>> +    u32 sdciae_closid;
>> +
>> +    if (!resctrl_arch_get_sdciae_enabled(RDT_RESOURCE_L3)) {
> 
> (same issue with this file appearing in all cache resources, eg. L2)

Sure. Will address it.

> 
>> +        rdt_last_cmd_puts("SDCIAE is not enabled\n");
>> +        return -EINVAL;
>> +    }
>> +
>> +    sdciae_closid = get_sdciae_closid(r);
>> +
>> +    show_doms(seq, s, sdciae_closid);
>> +
>> +    return 0;
>> +}
> 
> This really needs protection. (You should have encountered warnings
> via lockdep_assert_held(&rdtgroup_mutex) and lockdep_assert_cpus_held()
> found in the functions called.)


Sure. Will fix it.

>> +
>>   /* rdtgroup information files for one cache resource. */
>>   static struct rftype res_common_files[] = {
>>       {
>> @@ -2081,6 +2100,12 @@ static struct rftype res_common_files[] = {
>>           .seq_show    = resctrl_sdciae_show,
>>           .write        = resctrl_sdciae_write,
>>       },
>> +    {
>> +        .name        = "sdciae_cbm",
>> +        .mode        = 0444,
>> +        .kf_ops        = &rdtgroup_kf_single_ops,
>> +        .seq_show    = resctrl_sdciae_cbm_show,
>> +    },
>>       {
>>           .name        = "mode",
>>           .mode        = 0644,
>> @@ -2187,6 +2212,10 @@ void __init resctrl_sdciae_rftype_init(void)
>>       rft = rdtgroup_get_rftype_by_name("sdciae");
>>       if (rft)
>>           rft->fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE;
>> +
>> +    rft = rdtgroup_get_rftype_by_name("sdciae_cbm");
>> +    if (rft)
>> +        rft->fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE;
>>   }
>>     /**
> 
> Reinette
> 

-- 
Thanks
Babu Moger

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