linux-kernel - [tip: x86/cache] x86/resctrl: Support Sub-NUMA cluster mode SNC6

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Message-ID: <173088740941.32228.14785978598357685.tip-bot2@tip-bot2>
Date: Wed, 06 Nov 2024 10:03:29 -0000
From: "tip-bot2 for Tony Luck" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Tony Luck <tony.luck@...el.com>, "Borislav Petkov (AMD)" <bp@...en8.de>,
 Reinette Chatre <reinette.chatre@...el.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/cache] x86/resctrl: Support Sub-NUMA cluster mode SNC6

The following commit has been merged into the x86/cache branch of tip:

Commit-ID:     9bce6e94c4b39b6baa649784d92f908aa9168a45
Gitweb:        https://git.kernel.org/tip/9bce6e94c4b39b6baa649784d92f908aa9168a45
Author:        Tony Luck <tony.luck@...el.com>
AuthorDate:    Thu, 31 Oct 2024 15:02:13 -07:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Wed, 06 Nov 2024 10:49:04 +01:00

x86/resctrl: Support Sub-NUMA cluster mode SNC6

Support Sub-NUMA cluster mode with 6 nodes per L3 cache (SNC6) on some
Intel platforms.

Signed-off-by: Tony Luck <tony.luck@...el.com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Link: https://lore.kernel.org/r/20241031220213.17991-1-tony.luck@intel.com
---
 arch/x86/kernel/cpu/resctrl/monitor.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 851b561..5fcb3d6 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1158,11 +1158,12 @@ static __init int snc_get_config(void)
 
 	ret = cpus_per_l3 / cpus_per_node;
 
-	/* sanity check: Only valid results are 1, 2, 3, 4 */
+	/* sanity check: Only valid results are 1, 2, 3, 4, 6 */
 	switch (ret) {
 	case 1:
 		break;
 	case 2 ... 4:
+	case 6:
 		pr_info("Sub-NUMA Cluster mode detected with %d nodes per L3 cache\n", ret);
 		rdt_resources_all[RDT_RESOURCE_L3].r_resctrl.mon_scope = RESCTRL_L3_NODE;
 		break;