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x86/intel_rdt/cqm: Add RMID (Resource monitoring ID) management

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Hardware uses RMID(Resource monitoring ID) to keep track of each of the
RDT events associated with tasks. The number of RMIDs is dependent on
the SKU and is enumerated via CPUID. We add support to manage the RMIDs
which include managing the RMID allocation and reading LLC occupancy
for an RMID.

RMID allocation is managed by keeping a free list which is initialized
to all available RMIDs except for RMID 0 which is always reserved for
root group. RMIDs goto a limbo list once they are
freed since the RMIDs are still tagged to cache lines of the tasks which
were using them - thereby still having some occupancy. They continue to
be in limbo list until the occupancy < threshold_occupancy. The
threshold_occupancy is a user configurable value.
OS uses IA32_QM_CTR MSR to read the occupancy associated with an RMID
after programming the IA32_EVENTSEL MSR with the RMID.

[Tony: Improved limbo search]

Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: ravi.v.shankar@intel.com
Cc: tony.luck@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/1501017287-28083-10-git-send-email-vikas.shivappa@linux.intel.com
This commit is contained in:
Vikas Shivappa
2017-07-25 14:14:28 -07:00
committed by Thomas Gleixner
parent 6a445edce6
commit edf6fa1c4a
3 changed files with 251 additions and 0 deletions
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6
arch/x86/kernel/cpu/intel_rdt.h
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@@ -19,6 +19,8 @@
#define QOS_L3_OCCUP_EVENT_ID 0x01
#define QOS_L3_MBM_TOTAL_EVENT_ID 0x02
#define QOS_L3_MBM_LOCAL_EVENT_ID 0x03
#define RMID_VAL_ERROR BIT_ULL(63)
#define RMID_VAL_UNAVAIL BIT_ULL(62)
/**
* struct mon_evt - Entry in the event list of a resource
@@ -98,6 +100,8 @@ struct rftype {
* @list: all instances of this resource
* @id: unique id for this instance
* @cpu_mask: which cpus share this resource
* @rmid_busy_llc:
* bitmap of which limbo RMIDs are above threshold
* @ctrl_val: array of cache or mem ctrl values (indexed by CLOSID)
* @new_ctrl: new ctrl value to be loaded
* @have_new_ctrl: did user provide new_ctrl for this domain
@@ -106,6 +110,7 @@ struct rdt_domain {
struct list_head list;
int id;
struct cpumask cpu_mask;
unsigned long *rmid_busy_llc;
u32 *ctrl_val;
u32 new_ctrl;
bool have_new_ctrl;
@@ -282,6 +287,7 @@ 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);
struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);
int rdt_get_mon_l3_config(struct rdt_resource *r);
#endif /* _ASM_X86_INTEL_RDT_H */