4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Xiaochen Shen xiaochen.shen@intel.com
[ Upstream commit 2cc81c6992248ea37d0241bc325977bab310bc3b ]
In resctrl filesystem, mount options exist to enable L3/L2 CDP and MBA Software Controller features if the platform supports them:
mount -t resctrl resctrl [-o cdp[,cdpl2][,mba_MBps]] /sys/fs/resctrl
But currently only "cdp" option is displayed in /proc/mounts. "cdpl2" and "mba_MBps" options are not shown even when they are active.
Before: # mount -t resctrl resctrl -o cdp,mba_MBps /sys/fs/resctrl # grep resctrl /proc/mounts /sys/fs/resctrl /sys/fs/resctrl resctrl rw,relatime,cdp 0 0
After: # mount -t resctrl resctrl -o cdp,mba_MBps /sys/fs/resctrl # grep resctrl /proc/mounts /sys/fs/resctrl /sys/fs/resctrl resctrl rw,relatime,cdp,mba_MBps 0 0
Signed-off-by: Xiaochen Shen xiaochen.shen@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 Link: https://lkml.kernel.org/r/1536796118-60135-1-git-send-email-fenghua.yu@intel... Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c +++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c @@ -2805,6 +2805,13 @@ static int rdtgroup_show_options(struct { if (rdt_resources_all[RDT_RESOURCE_L3DATA].alloc_enabled) seq_puts(seq, ",cdp"); + + if (rdt_resources_all[RDT_RESOURCE_L2DATA].alloc_enabled) + seq_puts(seq, ",cdpl2"); + + if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA])) + seq_puts(seq, ",mba_MBps"); + return 0; }