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| author | James Morse <james.morse@arm.com> | 2021-07-28 17:06:36 +0000 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-08-11 18:37:02 +0200 |
| commit | 327364d5b6b6f8c89d2d6253a986d80323512890 (patch) | |
| tree | ef151676ac74ea8fef697b9973a2348850da8f1e /arch/x86/kernel | |
| parent | fbc06c69805976e1b5c7e6bd0b89c5b0f5282cdf (diff) | |
| download | linux-327364d5b6b6f8c89d2d6253a986d80323512890.tar.bz2 | |
x86/resctrl: Expand resctrl_arch_update_domains()'s msr_param range
resctrl_arch_update_domains() specifies the one closid that has been
modified and needs copying to the hardware.
resctrl_arch_update_domains() takes a struct rdt_resource and a closid
as arguments, but copies all the staged configurations for that closid
into the ctrl_val[] array.
resctrl_arch_update_domains() is called once per schema, but once the
resources and domains are merged, the second call of a L2CODE/L2DATA
pair will find no staged configurations, as they were previously
applied. The msr_param of the first call only has one index, so would
only have update the hardware for the last staged configuration.
To avoid a second round of IPIs when changing L2CODE and L2DATA in one
go, expand the range of the msr_param if multiple staged configurations
are found.
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lkml.kernel.org/r/20210728170637.25610-24-james.morse@arm.com
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c index 92d79c88b965..a487cf7ff04e 100644 --- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c +++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c @@ -292,6 +292,7 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid) return -ENOMEM; mba_sc = is_mba_sc(r); + msr_param.res = NULL; list_for_each_entry(d, &r->domains, list) { hw_dom = resctrl_to_arch_dom(d); for (t = 0; t < CDP_NUM_TYPES; t++) { @@ -303,9 +304,14 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid) if (!apply_config(hw_dom, cfg, idx, cpu_mask, mba_sc)) continue; - msr_param.low = idx; - msr_param.high = msr_param.low + 1; - msr_param.res = r; + if (!msr_param.res) { + msr_param.low = idx; + msr_param.high = msr_param.low + 1; + msr_param.res = r; + } else { + msr_param.low = min(msr_param.low, idx); + msr_param.high = max(msr_param.high, idx + 1); + } } } |