Commit dc2a3e85 authored by Babu Moger's avatar Babu Moger Committed by Borislav Petkov (AMD)
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x86/resctrl: Add interface to read mbm_total_bytes_config 



The event configuration can be viewed by the user by reading the
configuration file /sys/fs/resctrl/info/L3_MON/mbm_total_bytes_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_config is set to 0x7f to count all the
event types.

For example:

  $cat /sys/fs/resctrl/info/L3_MON/mbm_total_bytes_config
  0=0x7f;1=0x7f;2=0x7f;3=0x7f

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

Signed-off-by: default avatarBabu Moger <babu.moger@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: default avatarReinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20230113152039.770054-10-babu.moger@amd.com
parent d507f83c

arch/x86/include/asm/msr-index.h

+1 −0
Original line number Diff line number Diff line
@@ -1062,6 +1062,7 @@ 
/* - AMD: */

#define MSR_IA32_MBA_BW_BASE		0xc0000200

#define MSR_IA32_SMBA_BW_BASE		0xc0000280

#define MSR_IA32_EVT_CFG_BASE		0xc0000400



/* MSR_IA32_VMX_MISC bits */

#define MSR_IA32_VMX_MISC_INTEL_PT                 (1ULL << 14)

arch/x86/kernel/cpu/resctrl/internal.h

+24 −0
Original line number Diff line number Diff line
@@ -30,6 +30,29 @@ 
 */

#define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)



/* Reads to Local DRAM Memory */

#define READS_TO_LOCAL_MEM		BIT(0)



/* Reads to Remote DRAM Memory */

#define READS_TO_REMOTE_MEM		BIT(1)



/* Non-Temporal Writes to Local Memory */

#define NON_TEMP_WRITE_TO_LOCAL_MEM	BIT(2)



/* Non-Temporal Writes to Remote Memory */

#define NON_TEMP_WRITE_TO_REMOTE_MEM	BIT(3)



/* Reads to Local Memory the system identifies as "Slow Memory" */

#define READS_TO_LOCAL_S_MEM		BIT(4)



/* Reads to Remote Memory the system identifies as "Slow Memory" */

#define READS_TO_REMOTE_S_MEM		BIT(5)



/* Dirty Victims to All Types of Memory */

#define DIRTY_VICTIMS_TO_ALL_MEM	BIT(6)



/* Max event bits supported */

#define MAX_EVT_CONFIG_BITS		GENMASK(6, 0)



struct rdt_fs_context {

	struct kernfs_fs_context	kfc;
@@ -531,5 +554,6 @@ 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(const char *config);



#endif /* _ASM_X86_RESCTRL_INTERNAL_H */

arch/x86/kernel/cpu/resctrl/monitor.c

+3 −1
Original line number Diff line number Diff line
@@ -801,8 +801,10 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r) 
		return ret;



	if (rdt_cpu_has(X86_FEATURE_BMEC)) {

		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL))

		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL)) {

			mbm_total_event.configurable = true;

			mbm_config_rftype_init("mbm_total_bytes_config");

		}

		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))

			mbm_local_event.configurable = true;

	}

arch/x86/kernel/cpu/resctrl/rdtgroup.c

+102 −0
Original line number Diff line number Diff line
@@ -1420,6 +1420,93 @@ static int rdtgroup_size_show(struct kernfs_open_file *of, 
	return ret;

}



struct mon_config_info {

	u32 evtid;

	u32 mon_config;

};



#define INVALID_CONFIG_INDEX   UINT_MAX



/**

 * mon_event_config_index_get - get the hardware index for the

 *                              configurable event

 * @evtid: event id.

 *

 * Return: 0 for evtid == QOS_L3_MBM_TOTAL_EVENT_ID

 *         1 for evtid == QOS_L3_MBM_LOCAL_EVENT_ID

 *         INVALID_CONFIG_INDEX for invalid evtid

 */

static inline unsigned int mon_event_config_index_get(u32 evtid)

{

	switch (evtid) {

	case QOS_L3_MBM_TOTAL_EVENT_ID:

		return 0;

	case QOS_L3_MBM_LOCAL_EVENT_ID:

		return 1;

	default:

		/* Should never reach here */

		return INVALID_CONFIG_INDEX;

	}

}



static void mon_event_config_read(void *info)

{

	struct mon_config_info *mon_info = info;

	unsigned int index;

	u32 h;



	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;

	}

	rdmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, h);



	/* Report only the valid event configuration bits */

	mon_info->mon_config &= MAX_EVT_CONFIG_BITS;

}



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;



	mutex_lock(&rdtgroup_mutex);



	list_for_each_entry(dom, &r->domains, list) {

		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->id, mon_info.mon_config);

		sep = true;

	}

	seq_puts(s, "\n");



	mutex_unlock(&rdtgroup_mutex);



	return 0;

}



static int mbm_total_bytes_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[] = {

	{
@@ -1518,6 +1605,12 @@ static struct rftype res_common_files[] = { 
		.seq_show	= max_threshold_occ_show,

		.fflags		= RF_MON_INFO | RFTYPE_RES_CACHE,

	},

	{

		.name		= "mbm_total_bytes_config",

		.mode		= 0444,

		.kf_ops		= &rdtgroup_kf_single_ops,

		.seq_show	= mbm_total_bytes_config_show,

	},

	{

		.name		= "cpus",

		.mode		= 0644,
@@ -1624,6 +1717,15 @@ void __init thread_throttle_mode_init(void) 
	rft->fflags = RF_CTRL_INFO | RFTYPE_RES_MB;

}



void __init mbm_config_rftype_init(const char *config)

{

	struct rftype *rft;



	rft = rdtgroup_get_rftype_by_name(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.