]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
x86/intel_rdt: Fix invalid mode warning when multiple resources are managed
authorReinette Chatre <reinette.chatre@intel.com>
Sat, 15 Sep 2018 21:58:22 +0000 (14:58 -0700)
committerThomas Gleixner <tglx@linutronix.de>
Tue, 18 Sep 2018 21:38:05 +0000 (23:38 +0200)
commit47d53b184aee983ab9492503da11b0a81b19145b
treeb8a5c68937824572f96ecadb202a1ab5db6f3362
parentc793da8e4c62d2c002a79c47f44efead450cbcae
x86/intel_rdt: Fix invalid mode warning when multiple resources are managed

When multiple resources are managed by RDT, the number of CLOSIDs used
is the minimum of the CLOSIDs supported by each resource. In the function
rdt_bit_usage_show(), the annotated bitmask is created to depict how the
CAT supporting caches are being used. During this annotated bitmask
creation, each resource group is queried for its mode that is used as a
label in the annotated bitmask.

The maximum number of resource groups is currently assumed to be the
number of CLOSIDs supported by the resource for which the information is
being displayed. This is incorrect since the number of active CLOSIDs is
the minimum across all resources.

If information for a cache instance with more CLOSIDs than another is
being generated we thus encounter a warning like:

invalid mode for closid 8
WARNING: CPU: 88 PID: 1791 at [SNIP]/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
:827 rdt_bit_usage_show+0x221/0x2b0

Fix this by ensuring that only the number of supported CLOSIDs are
considered.

Fixes: e651901187ab8 ("x86/intel_rdt: Introduce "bit_usage" to display cache allocations details")
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "H Peter Anvin" <hpa@zytor.com>
Cc: "Tony Luck" <tony.luck@intel.com>
Cc: "Xiaochen Shen" <xiaochen.shen@intel.com>
Cc: "Chen Yu" <yu.c.chen@intel.com>
Link: https://lkml.kernel.org/r/1537048707-76280-5-git-send-email-fenghua.yu@intel.com
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c