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| author | Anton Blanchard <anton@samba.org> | 2017-09-08 03:11:12 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-22 05:48:36 +1100 |
| commit | b6d34eb4d280c893d0f442f4b9e039d73e3db420 (patch) | |
| tree | 5dec89635915a9a52d2b76d4a5888994181e7da3 /arch | |
| parent | 8d81296cfcce89013a714feb8d25004a156f8181 (diff) | |
| download | linux-b6d34eb4d280c893d0f442f4b9e039d73e3db420.tar.gz linux-b6d34eb4d280c893d0f442f4b9e039d73e3db420.tar.bz2 linux-b6d34eb4d280c893d0f442f4b9e039d73e3db420.zip | |
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')
| -rw-r--r-- | arch/powerpc/kernel/sysfs.c | 8 |
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 |