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@xxxxxxx>
>> ---
>> 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
