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x86/resctrl: Only check Intel systems for SNC

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topology_num_nodes_per_package() reports values greater than one on certain
AMD systems resulting in resctrl's Intel model specific SNC detection
printing the confusing message:

   "CoD enabled system? Resctrl not supported"

Add a check for Intel systems before looking at the topology.

[ reinette: Add Closes tag, fix tag typos, rework changelog ]

Fixes: 59674fc9d0 ("x86/resctrl: Fix SNC detection")
Reported-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://patch.msgid.link/9849330f45ac86344cc5ac54df2d313906d70bc4.1780634584.git.reinette.chatre@intel.com
Closes: https://lore.kernel.org/lkml/37ac0376-43a3-4283-a3d5-4d57b3bec578@amd.com/
This commit is contained in:
Tony Luck 2026-06-04 21:46:49 -07:00 • committed by Ingo Molnar
commit 6f6947b238
1 changed files with 6 additions and 1 deletions
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7
arch/x86/kernel/cpu/resctrl/monitor.c
View file

@ -377,7 +377,12 @@ static const struct x86_cpu_id snc_cpu_ids[] __initconst = {
static __init int snc_get_config(void)
{
int ret = topology_num_nodes_per_package();
int ret;
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
return 1;
ret = topology_num_nodes_per_package();
if (ret > 1 && !x86_match_cpu(snc_cpu_ids)) {
pr_warn("CoD enabled system? Resctrl not supported\n");