x86/intel_rdt/cqm: Add RDT monitoring initialization

Add common data structures for RDT resource monitoring and perform RDT
monitoring related data structure initializations which include setting
up the RMID(Resource monitoring ID) lists and event list which the
resource supports.

[ tony: some cleanup to make adding MBM easier later, remove "cqm" from
  	some names, make some data structure local to intel_rdt_monitor.c
  	static. Add copyright header]

[ tglx: Made it readable ]

Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: ravi.v.shankar@intel.com
Cc: fenghua.yu@intel.com
Cc: peterz@infradead.org
Cc: eranian@google.com
Cc: vikas.shivappa@intel.com
Cc: ak@linux.intel.com
Cc: davidcc@google.com
Cc: reinette.chatre@intel.com
Link: http://lkml.kernel.org/r/1501017287-28083-9-git-send-email-vikas.shivappa@linux.intel.com

1 files changed, 44 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h
index 29630af30c38..993ab9d678bc 100644
--- a/arch/x86/kernel/cpu/intel_rdt.h
+++ b/arch/x86/kernel/cpu/intel_rdt.h
@@ -12,6 +12,29 @@
 
 #define L3_QOS_CDP_ENABLE	0x01ULL
 
+/*
+ * Event IDs are used to program IA32_QM_EVTSEL before reading event
+ * counter from IA32_QM_CTR
+ */
+#define QOS_L3_OCCUP_EVENT_ID		0x01
+#define QOS_L3_MBM_TOTAL_EVENT_ID	0x02
+#define QOS_L3_MBM_LOCAL_EVENT_ID	0x03
+
+/**
+ * struct mon_evt - Entry in the event list of a resource
+ * @evtid:		event id
+ * @name:		name of the event
+ */
+struct mon_evt {
+	u32			evtid;
+	char			*name;
+	struct list_head	list;
+};
+
+extern unsigned int intel_cqm_threshold;
+extern bool rdt_alloc_capable;
+extern bool rdt_mon_capable;
+extern unsigned int rdt_mon_features;
 /**
  * struct rdtgroup - store rdtgroup's data in resctrl file system.
  * @kn:				kernfs node
@@ -133,10 +156,17 @@ struct rdt_membw {
 	u32		*mb_map;
 };
 
+static inline bool is_llc_occupancy_enabled(void)
+{
+	return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
+}
+
 /**
  * struct rdt_resource - attributes of an RDT resource
  * @alloc_enabled:	Is allocation enabled on this machine
+ * @mon_enabled:		Is monitoring enabled for this feature
  * @alloc_capable:	Is allocation available on this machine
+ * @mon_capable:		Is monitor feature available on this machine
  * @name:		Name to use in "schemata" file
  * @num_closid:		Number of CLOSIDs available
  * @cache_level:	Which cache level defines scope of this resource
@@ -150,10 +180,15 @@ struct rdt_membw {
  * @nr_info_files:	Number of info files
  * @format_str:		Per resource format string to show domain value
  * @parse_ctrlval:	Per resource function pointer to parse control values
+ * @evt_list:			List of monitoring events
+ * @num_rmid:			Number of RMIDs available
+ * @mon_scale:			cqm counter * mon_scale = occupancy in bytes
  */
 struct rdt_resource {
 	bool			alloc_enabled;
+	bool			mon_enabled;
 	bool			alloc_capable;
+	bool			mon_capable;
 	char			*name;
 	int			num_closid;
 	int			cache_level;
@@ -170,6 +205,9 @@ struct rdt_resource {
 	const char		*format_str;
 	int (*parse_ctrlval)	(char *buf, struct rdt_resource *r,
 				 struct rdt_domain *d);
+	struct list_head	evt_list;
+	int			num_rmid;
+	unsigned int		mon_scale;
 };
 
 void rdt_get_cache_infofile(struct rdt_resource *r);
@@ -201,6 +239,11 @@ enum {
 	     r++)							      \
 		if (r->alloc_capable)
 
+#define for_each_mon_capable_rdt_resource(r)				      \
+	for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
+	     r++)							      \
+		if (r->mon_capable)
+
 #define for_each_alloc_enabled_rdt_resource(r)				      \
 	for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
 	     r++)							      \
@@ -239,5 +282,6 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 				char *buf, size_t nbytes, loff_t off);
 int rdtgroup_schemata_show(struct kernfs_open_file *of,
 			   struct seq_file *s, void *v);
+int rdt_get_mon_l3_config(struct rdt_resource *r);
 
 #endif /* _ASM_X86_INTEL_RDT_H */