Commit 6b281569 authored by Fenghua Yu's avatar Fenghua Yu Committed by Thomas Gleixner
Browse files

x86/cqm: Share PQR_ASSOC related data between CQM and CAT 



PQR_ASSOC MSR contains the RMID used for preformance monitoring of cache
occupancy and memory bandwidth. The upper 32bit of this MSR contain the
CLOSID for cache allocation. So we need to share the information between
the two facilities.

Move the rdt data structure declaration into the shared header file and
make the per cpu data structure containing the MSR values global.

Signed-off-by: default avatarFenghua Yu <fenghua.yu@intel.com>
Cc: "Ravi V Shankar" <ravi.v.shankar@intel.com>
Cc: "Tony Luck" <tony.luck@intel.com>
Cc: "David Carrillo-Cisneros" <davidcc@google.com>
Cc: "Sai Prakhya" <sai.praneeth.prakhya@intel.com>
Cc: "Peter Zijlstra" <peterz@infradead.org>
Cc: "Stephane Eranian" <eranian@google.com>
Cc: "Dave Hansen" <dave.hansen@intel.com>
Cc: "Shaohua Li" <shli@fb.com>
Cc: "Nilay Vaish" <nilayvaish@gmail.com>
Cc: "Vikas Shivappa" <vikas.shivappa@linux.intel.com>
Cc: "Ingo Molnar" <mingo@elte.hu>
Cc: "Borislav Petkov" <bp@suse.de>
Cc: "H. Peter Anvin" <h.peter.anvin@intel.com>
Link: http://lkml.kernel.org/r/1477142405-32078-10-git-send-email-fenghua.yu@intel.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent c1c7c3f9

arch/x86/events/intel/cqm.c

+1 −20
Original line number Diff line number Diff line
@@ -24,32 +24,13 @@ static unsigned int cqm_l3_scale; /* supposedly cacheline size */ 
static bool cqm_enabled, mbm_enabled;

unsigned int mbm_socket_max;



/**

 * struct intel_pqr_state - State cache for the PQR MSR

 * @rmid:		The cached Resource Monitoring ID

 * @closid:		The cached Class Of Service ID

 * @rmid_usecnt:	The usage counter for rmid

 *

 * The upper 32 bits of MSR_IA32_PQR_ASSOC contain closid and the

 * lower 10 bits rmid. The update to MSR_IA32_PQR_ASSOC always

 * contains both parts, so we need to cache them.

 *

 * The cache also helps to avoid pointless updates if the value does

 * not change.

 */

struct intel_pqr_state {

	u32			rmid;

	u32			closid;

	int			rmid_usecnt;

};



/*

 * The cached intel_pqr_state is strictly per CPU and can never be

 * updated from a remote CPU. Both functions which modify the state

 * (intel_cqm_event_start and intel_cqm_event_stop) are called with

 * interrupts disabled, which is sufficient for the protection.

 */

static DEFINE_PER_CPU(struct intel_pqr_state, pqr_state);

DEFINE_PER_CPU(struct intel_pqr_state, pqr_state);

static struct hrtimer *mbm_timers;

/**

 * struct sample - mbm event's (local or total) data

arch/x86/include/asm/intel_rdt_common.h

+21 −0
Original line number Diff line number Diff line
@@ -3,4 +3,25 @@ 


#define MSR_IA32_PQR_ASSOC	0x0c8f



/**

 * struct intel_pqr_state - State cache for the PQR MSR

 * @rmid:		The cached Resource Monitoring ID

 * @closid:		The cached Class Of Service ID

 * @rmid_usecnt:	The usage counter for rmid

 *

 * The upper 32 bits of MSR_IA32_PQR_ASSOC contain closid and the

 * lower 10 bits rmid. The update to MSR_IA32_PQR_ASSOC always

 * contains both parts, so we need to cache them.

 *

 * The cache also helps to avoid pointless updates if the value does

 * not change.

 */

struct intel_pqr_state {

	u32			rmid;

	u32			closid;

	int			rmid_usecnt;

};



DECLARE_PER_CPU(struct intel_pqr_state, pqr_state);



#endif /* _ASM_X86_INTEL_RDT_COMMON_H */

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