summaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/sysfs.c
diff options
context:
space:
mode:
authorAnton Blanchard <anton@samba.org>2017-09-07 20:11:12 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2018-01-21 21:48:36 +0300
commitb6d34eb4d280c893d0f442f4b9e039d73e3db420 (patch)
tree5dec89635915a9a52d2b76d4a5888994181e7da3 /arch/powerpc/kernel/sysfs.c
parent8d81296cfcce89013a714feb8d25004a156f8181 (diff)
downloadlinux-b6d34eb4d280c893d0f442f4b9e039d73e3db420.tar.xz
powerpc: Expose TSCR via sysfs
The thread switch control register (TSCR) is a per core register that configures how the CPU shares resources between SMT threads. Exposing it via sysfs allows us to tune it at run time. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/sysfs.c')
-rw-r--r--arch/powerpc/kernel/sysfs.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index b8d4a1dac39f..5a8bfee6e187 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -485,6 +485,7 @@ SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
SYSFS_SPRSETUP(purr, SPRN_PURR);
SYSFS_SPRSETUP(spurr, SPRN_SPURR);
SYSFS_SPRSETUP(pir, SPRN_PIR);
+SYSFS_SPRSETUP(tscr, SPRN_TSCR);
/*
Lets only enable read for phyp resources and
@@ -495,6 +496,7 @@ static DEVICE_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
static DEVICE_ATTR(spurr, 0400, show_spurr, NULL);
static DEVICE_ATTR(purr, 0400, show_purr, store_purr);
static DEVICE_ATTR(pir, 0400, show_pir, NULL);
+static DEVICE_ATTR(tscr, 0600, show_tscr, store_tscr);
/*
* This is the system wide DSCR register default value. Any
@@ -785,6 +787,9 @@ static int register_cpu_online(unsigned int cpu)
if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
device_create_file(s, &dev_attr_pir);
+
+ if (cpu_has_feature(CPU_FTR_ARCH_206))
+ device_create_file(s, &dev_attr_tscr);
#endif /* CONFIG_PPC64 */
#ifdef CONFIG_PPC_FSL_BOOK3E
@@ -867,6 +872,9 @@ static int unregister_cpu_online(unsigned int cpu)
if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
device_remove_file(s, &dev_attr_pir);
+
+ if (cpu_has_feature(CPU_FTR_ARCH_206))
+ device_remove_file(s, &dev_attr_tscr);
#endif /* CONFIG_PPC64 */
#ifdef CONFIG_PPC_FSL_BOOK3E