linux-kernel - [PATCH V2 4/5] x86/intel_rdt: Hot cpu update for code data prioritization

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Date:	Thu,  1 Oct 2015 23:33:58 -0700
From:	Fenghua Yu <fenghua.yu@...el.com>
To:	"H Peter Anvin" <hpa@...or.com>, "Ingo Molnar" <mingo@...hat.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Peter Zijlstra" <peterz@...radead.org>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"x86" <x86@...nel.org>, "Fenghua Yu" <fenghua.yu@...el.com>,
	"Vikas Shivappa" <vikas.shivappa@...ux.intel.com>
Subject: [PATCH V2 4/5] x86/intel_rdt: Hot cpu update for code data prioritization

Updates hot cpu notification handling for code data prioritization(cdp).
The capacity bitmask(cbm) is global for both data and instruction and we
need to update the new online package with all the cbms by writing to
the IA32_L3_QOS_n MSRs.

Signed-off-by: Vikas Shivappa <vikas.shivappa@...ux.intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 arch/x86/kernel/cpu/intel_rdt.c | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
index eab9d73..fe4d8e3 100644
--- a/arch/x86/kernel/cpu/intel_rdt.c
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -501,6 +501,26 @@ static inline bool rdt_cpumask_update(int cpu)
 	return false;
 }
 
+static void cbm_update_msr(u32 index)
+{
+	struct rdt_remote_data info;
+	int dindex;
+
+	dindex = DCBM_TABLE_INDEX(index);
+	if (cctable[dindex].clos_refcnt) {
+
+		info.msr = CBM_FROM_INDEX(dindex);
+		info.val = cctable[dindex].l3_cbm;
+		msr_cpu_update((void *) &info);
+
+		if (cdp_enabled) {
+			info.msr = __ICBM_MSR_INDEX(index);
+			info.val = cctable[dindex + 1].l3_cbm;
+			msr_cpu_update((void *) &info);
+		}
+	}
+}
+
 /*
  * cbm_update_msrs() - Updates all the existing IA32_L3_MASK_n MSRs
  * which are one per CLOSid on the current package.
@@ -508,15 +528,10 @@ static inline bool rdt_cpumask_update(int cpu)
 static void cbm_update_msrs(void *dummy)
 {
 	int maxid = cconfig.max_closid;
-	struct rdt_remote_data info;
 	unsigned int i;
 
 	for (i = 0; i < maxid; i++) {
-		if (cctable[i].clos_refcnt) {
-			info.msr = CBM_FROM_INDEX(i);
-			info.val = cctable[i].l3_cbm;
-			msr_cpu_update((void *) &info);
-		}
+		cbm_update_msr(i);
 	}
 }
 
-- 
1.8.1.2

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