x86/intel_rdt: Discover supported platforms via prefetch disable bits
authorReinette Chatre <reinette.chatre@intel.com>
Fri, 22 Jun 2018 22:42:20 +0000 (15:42 -0700)
committerThomas Gleixner <tglx@linutronix.de>
Sat, 23 Jun 2018 11:03:49 +0000 (13:03 +0200)
commitf2a177292bd052ce12ac453d2ceeb083fe07718a
tree005de372bbef68b4de7c56a1ed0943a0c2d25d19
parent72d505056604a305a4fcd8b268d2f6e979e17023
x86/intel_rdt: Discover supported platforms via prefetch disable bits

Knowing the model specific prefetch disable bits is required to support
cache pseudo-locking because the hardware prefetchers need to be disabled
when the kernel memory is pseudo-locked to cache. We add these bits only
for platforms known to support cache pseudo-locking.

When the user requests locksetup mode to be entered it will fail if the
prefetch disabling bits are not known for the platform.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: fenghua.yu@intel.com
Cc: tony.luck@intel.com
Cc: vikas.shivappa@linux.intel.com
Cc: gavin.hindman@intel.com
Cc: jithu.joseph@intel.com
Cc: dave.hansen@intel.com
Cc: hpa@zytor.com
Link: https://lkml.kernel.org/r/3eef559aa9fd693a104ff99ff909cfee450c1695.1529706536.git.reinette.chatre@intel.com
arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c