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| author | James Morse <james.morse@arm.com> | 2022-09-02 15:48:28 +0000 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2022-09-23 14:24:16 +0200 |
| commit | d80975e264c8f01518890f3d91ab5bada8fa7f5e (patch) | |
| tree | ac727af5ee8384f3e88b6fc0252932233dc0e92b /arch/x86/kernel/cpu | |
| parent | ae2328b52962531c2d7c6b531022a3eb2d680f17 (diff) | |
| download | linux-d80975e264c8f01518890f3d91ab5bada8fa7f5e.tar.bz2 | |
x86/resctrl: Add resctrl_rmid_realloc_limit to abstract x86's boot_cpu_data
resctrl_rmid_realloc_threshold can be set by user-space. The maximum
value is specified by the architecture.
Currently max_threshold_occ_write() reads the maximum value from
boot_cpu_data.x86_cache_size, which is not portable to another
architecture.
Add resctrl_rmid_realloc_limit to describe the maximum size in bytes
that user-space can set the threshold to.
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Jamie Iles <quic_jiles@quicinc.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@fujitsu.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Xin Hao <xhao@linux.alibaba.com>
Tested-by: Shaopeng Tan <tan.shaopeng@fujitsu.com>
Tested-by: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20220902154829.30399-21-james.morse@arm.com
Diffstat (limited to 'arch/x86/kernel/cpu')
| -rw-r--r-- | arch/x86/kernel/cpu/resctrl/monitor.c | 9 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/resctrl/rdtgroup.c | 2 |
2 files changed, 8 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c index e91afe99b763..8d15568d7121 100644 --- a/arch/x86/kernel/cpu/resctrl/monitor.c +++ b/arch/x86/kernel/cpu/resctrl/monitor.c @@ -67,6 +67,11 @@ unsigned int rdt_mon_features; */ unsigned int resctrl_rmid_realloc_threshold; +/* + * This is the maximum value for the reallocation threshold, in bytes. + */ +unsigned int resctrl_rmid_realloc_limit; + #define CF(cf) ((unsigned long)(1048576 * (cf) + 0.5)) /* @@ -747,10 +752,10 @@ int rdt_get_mon_l3_config(struct rdt_resource *r) { unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset; struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); - unsigned int cl_size = boot_cpu_data.x86_cache_size; unsigned int threshold; int ret; + resctrl_rmid_realloc_limit = boot_cpu_data.x86_cache_size * 1024; hw_res->mon_scale = boot_cpu_data.x86_cache_occ_scale; r->num_rmid = boot_cpu_data.x86_cache_max_rmid + 1; hw_res->mbm_width = MBM_CNTR_WIDTH_BASE; @@ -767,7 +772,7 @@ int rdt_get_mon_l3_config(struct rdt_resource *r) * * For a 35MB LLC and 56 RMIDs, this is ~1.8% of the LLC. */ - threshold = cl_size * 1024 / r->num_rmid; + threshold = resctrl_rmid_realloc_limit / r->num_rmid; /* * Because num_rmid may not be a power of two, round the value diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c index 849bdec37217..e5a48f05e787 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -1059,7 +1059,7 @@ static ssize_t max_threshold_occ_write(struct kernfs_open_file *of, if (ret) return ret; - if (bytes > (boot_cpu_data.x86_cache_size * 1024)) + if (bytes > resctrl_rmid_realloc_limit) return -EINVAL; resctrl_rmid_realloc_threshold = resctrl_arch_round_mon_val(bytes); |