linux-kernel - [PATCH v2 17/33] x86/intel_rdt: Hot cpu update for code data prioritization

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Message-Id: <1473328647-33116-18-git-send-email-fenghua.yu@intel.com>
Date:   Thu,  8 Sep 2016 02:57:11 -0700
From:   "Fenghua Yu" <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>,
        "H. Peter Anvin" <h.peter.anvin@...el.com>,
        "Ingo Molnar" <mingo@...e.hu>, "Tony Luck" <tony.luck@...el.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Tejun Heo" <tj@...nel.org>, "Borislav Petkov" <bp@...e.de>,
        "Stephane Eranian" <eranian@...gle.com>,
        "Marcelo Tosatti" <mtosatti@...hat.com>,
        "David Carrillo-Cisneros" <davidcc@...gle.com>,
        "Shaohua Li" <shli@...com>,
        "Ravi V Shankar" <ravi.v.shankar@...el.com>,
        "Vikas Shivappa" <vikas.shivappa@...ux.intel.com>,
        "Sai Prakhya" <sai.praneeth.prakhya@...el.com>
Cc:     "linux-kernel" <linux-kernel@...r.kernel.org>,
        "x86" <x86@...nel.org>, Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH v2 17/33] x86/intel_rdt: Hot cpu update for code data prioritization

From: Vikas Shivappa <vikas.shivappa@...ux.intel.com>

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>
Reviewed-by: Tony Luck <tony.luck@...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 9cee3fe..1bcff29 100644
--- a/arch/x86/kernel/cpu/intel_rdt.c
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -223,6 +223,26 @@ 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].cbm;
+		msr_cpu_update((void *) &info);
+
+		if (cdp_enabled) {
+			info.msr = __ICBM_MSR_INDEX(index);
+			info.val = cctable[dindex + 1].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.
@@ -230,15 +250,10 @@ 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].cbm;
-			msr_cpu_update((void *) &info);
-		}
+		cbm_update_msr(i);
 	}
 }
 
-- 
2.5.0