linux-kernel - [PATCH v9 07/13] x86/resctrl: Add vendor check for MBA software controller

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Date:   Wed, 21 Nov 2018 20:28:37 +0000
From:   "Moger, Babu" <Babu.Moger@....com>
To:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "corbet@....net" <corbet@....net>,
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Subject: [PATCH v9 07/13] x86/resctrl: Add vendor check for MBA software
 controller

MBA software controller support is available only on Intel.

Suggested-by: Fenghua Yu <fenghua.yu@...el.com>
Signed-off-by: Babu Moger <babu.moger@....com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index cf159095b612..fada488069cb 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1878,7 +1878,10 @@ static int parse_rdtgroupfs_options(char *data)
 			if (ret)
 				goto out;
 		} else if (!strcmp(token, "mba_MBps")) {
-			ret = set_mba_sc(true);
+			if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+				ret = set_mba_sc(true);
+			else
+				ret = -EINVAL;
 			if (ret)
 				goto out;
 		} else {
-- 
2.17.1