linux-kernel - [PATCH v6 03/14] arch/x86: Re-arrange RDT init code

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Date:   Tue, 6 Nov 2018 15:41:03 +0000
From:   "Moger, Babu" <Babu.Moger@....com>
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Subject: [PATCH v6 03/14] arch/x86: Re-arrange RDT init code

Separate the call sequence for rdt_quirks and MBA feature.
This is in preparation to handle vendor differences in these
call sequences.

Signed-off-by: Babu Moger <babu.moger@....com>
---
 arch/x86/kernel/cpu/resctrl.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl.c b/arch/x86/kernel/cpu/resctrl.c
index 5d526dc45751..fd5320dddddc 100644
--- a/arch/x86/kernel/cpu/resctrl.c
+++ b/arch/x86/kernel/cpu/resctrl.c
@@ -794,6 +794,16 @@ static bool __init rdt_cpu_has(int flag)
 	return ret;
 }
 
+static __init bool rdt_mba_config(void)
+{
+	if (rdt_cpu_has(X86_FEATURE_MBA)) {
+		if (rdt_get_mem_config(&rdt_resources_all[RDT_RESOURCE_MBA]))
+			return true;
+	}
+
+	return false;
+}
+
 static __init bool get_rdt_alloc_resources(void)
 {
 	bool ret = false;
@@ -818,10 +828,9 @@ static __init bool get_rdt_alloc_resources(void)
 		ret = true;
 	}
 
-	if (rdt_cpu_has(X86_FEATURE_MBA)) {
-		if (rdt_get_mem_config(&rdt_resources_all[RDT_RESOURCE_MBA]))
-			ret = true;
-	}
+	if (rdt_mba_config())
+		ret = true;
+
 	return ret;
 }
 
@@ -840,7 +849,7 @@ static __init bool get_rdt_mon_resources(void)
 	return !rdt_get_mon_l3_config(&rdt_resources_all[RDT_RESOURCE_L3]);
 }
 
-static __init void rdt_quirks(void)
+static __init void rdt_quirks_intel(void)
 {
 	switch (boot_cpu_data.x86_model) {
 	case INTEL_FAM6_HASWELL_X:
@@ -855,9 +864,14 @@ static __init void rdt_quirks(void)
 	}
 }
 
+static __init void rdt_quirks(void)
+{
+	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+		rdt_quirks_intel();
+}
+
 static __init bool get_rdt_resources(void)
 {
-	rdt_quirks();
 	rdt_alloc_capable = get_rdt_alloc_resources();
 	rdt_mon_capable = get_rdt_mon_resources();
 
@@ -871,6 +885,9 @@ static int __init resctrl_late_init(void)
 	struct rdt_resource *r;
 	int state, ret;
 
+	/* Run quirks first */
+	rdt_quirks();
+
 	if (!get_rdt_resources())
 		return -ENODEV;
 
-- 
2.17.1