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    Subject[PATCH v7 07/12] x86/resctrl: Add sysfs interface to read mbm_total_bytes event configuration
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    The current event configuration can be viewed by the user by reading
    the configuration file /sys/fs/resctrl/info/L3_MON/mbm_total_config.
    The event configuration settings are domain specific and will affect all
    the CPUs in the domain.

    Following are the types of events supported:
    ==== ===========================================================
    Bits Description
    ==== ===========================================================
    6 Dirty Victims from the QOS domain to all types of memory
    5 Reads to slow memory in the non-local NUMA domain
    4 Reads to slow memory in the local NUMA domain
    3 Non-temporal writes to non-local NUMA domain
    2 Non-temporal writes to local NUMA domain
    1 Reads to memory in the non-local NUMA domain
    0 Reads to memory in the local NUMA domain
    ==== ===========================================================

    By default, the mbm_total_bytes configuration is set to 0x7f to count
    all the event types.

    For example:
    $cat /sys/fs/resctrl/info/L3_MON/mbm_total_config
    0=0x7f;1=0x7f;2=0x7f;3=0x7f

    In this case, the event mbm_total_bytes is currently configured
    with 0x7f on domains 0 to 3.

    Signed-off-by: Babu Moger <babu.moger@amd.com>
    ---
    arch/x86/kernel/cpu/resctrl/core.c | 3 +
    arch/x86/kernel/cpu/resctrl/internal.h | 2 +
    arch/x86/kernel/cpu/resctrl/rdtgroup.c | 76 ++++++++++++++++++++++++++++++++
    3 files changed, 81 insertions(+)

    diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
    index 46813b1c50c2..758c5d7553a4 100644
    --- a/arch/x86/kernel/cpu/resctrl/core.c
    +++ b/arch/x86/kernel/cpu/resctrl/core.c
    @@ -826,6 +826,9 @@ static __init bool get_rdt_mon_resources(void)
    if (!rdt_mon_features)
    return false;

    + if (mon_configurable)
    + mbm_config_rftype_init();
    +
    return !rdt_get_mon_l3_config(r, mon_configurable);
    }

    diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
    index b458f768f30c..326a1b582f38 100644
    --- a/arch/x86/kernel/cpu/resctrl/internal.h
    +++ b/arch/x86/kernel/cpu/resctrl/internal.h
    @@ -15,6 +15,7 @@
    #define MSR_IA32_MBA_THRTL_BASE 0xd50
    #define MSR_IA32_MBA_BW_BASE 0xc0000200
    #define MSR_IA32_SMBA_BW_BASE 0xc0000280
    +#define MSR_IA32_EVT_CFG_BASE 0xc0000400

    #define MSR_IA32_QM_CTR 0x0c8e
    #define MSR_IA32_QM_EVTSEL 0x0c8d
    @@ -541,5 +542,6 @@ bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d);
    void __check_limbo(struct rdt_domain *d, bool force_free);
    void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
    void __init thread_throttle_mode_init(void);
    +void __init mbm_config_rftype_init(void);

    #endif /* _ASM_X86_RESCTRL_INTERNAL_H */
    diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
    index 5f0ef1bf4c78..0982845594d0 100644
    --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
    +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
    @@ -1423,6 +1423,67 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
    return ret;
    }

    +struct mon_config_info {
    + u32 evtid;
    + u32 mon_config;
    +};
    +
    +static void mon_event_config_read(void *info)
    +{
    + struct mon_config_info *mon_info = info;
    + u32 h, msr_index;
    +
    + switch (mon_info->evtid) {
    + case QOS_L3_MBM_TOTAL_EVENT_ID:
    + msr_index = 0;
    + break;
    + case QOS_L3_MBM_LOCAL_EVENT_ID:
    + msr_index = 1;
    + break;
    + default:
    + /* Not expected to come here */
    + return;
    + }
    +
    + rdmsr(MSR_IA32_EVT_CFG_BASE + msr_index, mon_info->mon_config, h);
    +}
    +
    +static void mondata_config_read(struct rdt_domain *d, struct mon_config_info *mon_info)
    +{
    + smp_call_function_any(&d->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_domain *dom;
    + bool sep = false;
    +
    + list_for_each_entry(dom, &r->domains, list) {
    + if (sep)
    + seq_puts(s, ";");
    +
    + mon_info.evtid = evtid;
    + mondata_config_read(dom, &mon_info);
    +
    + seq_printf(s, "%d=0x%02x", dom->id, mon_info.mon_config);
    + sep = true;
    + }
    + seq_puts(s, "\n");
    +
    + return 0;
    +}
    +
    +static int mbm_total_config_show(struct kernfs_open_file *of,
    + struct seq_file *seq, void *v)
    +{
    + struct rdt_resource *r = of->kn->parent->priv;
    +
    + mbm_config_show(seq, r, QOS_L3_MBM_TOTAL_EVENT_ID);
    +
    + return 0;
    +}
    +
    /* rdtgroup information files for one cache resource. */
    static struct rftype res_common_files[] = {
    {
    @@ -1521,6 +1582,12 @@ static struct rftype res_common_files[] = {
    .seq_show = max_threshold_occ_show,
    .fflags = RF_MON_INFO | RFTYPE_RES_CACHE,
    },
    + {
    + .name = "mbm_total_config",
    + .mode = 0644,
    + .kf_ops = &rdtgroup_kf_single_ops,
    + .seq_show = mbm_total_config_show,
    + },
    {
    .name = "cpus",
    .mode = 0644,
    @@ -1627,6 +1694,15 @@ void __init thread_throttle_mode_init(void)
    rft->fflags = RF_CTRL_INFO | RFTYPE_RES_MB;
    }

    +void __init mbm_config_rftype_init(void)
    +{
    + struct rftype *rft;
    +
    + rft = rdtgroup_get_rftype_by_name("mbm_total_config");
    + if (rft)
    + rft->fflags = RF_MON_INFO | RFTYPE_RES_CACHE;
    +}
    +
    /**
    * rdtgroup_kn_mode_restrict - Restrict user access to named resctrl file
    * @r: The resource group with which the file is associated.

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