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x86/intel_rdt/mba: Add info directory files for Memory Bandwidth Allocation
The files in the info directory for MBA are as follows: num_closids The maximum number of CLOSids available for MBA min_bandwidth The minimum memory bandwidth percentage value bandwidth_gran The granularity of the bandwidth control in percent for the particular CPU SKU. Intermediate values entered are rounded off to the previous control step available. Available bandwidth control steps are minimum_bandwidth + N * bandwidth_gran. delay_linear When set, the OS writes a linear percentage based value to the control MSRs ranging from minimum_bandwidth to 100 percent. This value is informational and has no influence on the values written to the schemata files. The values written to the schemata are always bandwidth percentage that is requested. Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com> Cc: ravi.v.shankar@intel.com Cc: tony.luck@intel.com Cc: fenghua.yu@intel.com Cc: vikas.shivappa@intel.com Link: http://lkml.kernel.org/r/1491611637-20417-7-git-send-email-vikas.shivappa@linux.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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6a507a6ad8
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3 changed files with 62 additions and 2 deletions
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@ -174,6 +174,7 @@ struct rdt_resource {
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};
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void rdt_get_cache_infofile(struct rdt_resource *r);
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void rdt_get_mba_infofile(struct rdt_resource *r);
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extern struct mutex rdtgroup_mutex;
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@ -203,6 +203,7 @@ static bool rdt_get_mem_config(struct rdt_resource *r)
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return false;
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}
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r->data_width = 3;
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rdt_get_mba_infofile(r);
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r->capable = true;
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r->enabled = true;
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@ -515,7 +515,6 @@ static int rdt_num_closids_show(struct kernfs_open_file *of,
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struct rdt_resource *r = of->kn->parent->priv;
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seq_printf(seq, "%d\n", r->num_closid);
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return 0;
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}
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@ -525,7 +524,6 @@ static int rdt_default_ctrl_show(struct kernfs_open_file *of,
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struct rdt_resource *r = of->kn->parent->priv;
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seq_printf(seq, "%x\n", r->default_ctrl);
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return 0;
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}
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@ -535,7 +533,33 @@ static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
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struct rdt_resource *r = of->kn->parent->priv;
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seq_printf(seq, "%u\n", r->cache.min_cbm_bits);
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return 0;
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}
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static int rdt_min_bw_show(struct kernfs_open_file *of,
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struct seq_file *seq, void *v)
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{
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struct rdt_resource *r = of->kn->parent->priv;
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seq_printf(seq, "%u\n", r->membw.min_bw);
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return 0;
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}
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static int rdt_bw_gran_show(struct kernfs_open_file *of,
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struct seq_file *seq, void *v)
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{
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struct rdt_resource *r = of->kn->parent->priv;
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seq_printf(seq, "%u\n", r->membw.bw_gran);
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return 0;
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}
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static int rdt_delay_linear_show(struct kernfs_open_file *of,
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struct seq_file *seq, void *v)
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{
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struct rdt_resource *r = of->kn->parent->priv;
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seq_printf(seq, "%u\n", r->membw.delay_linear);
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return 0;
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}
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@ -561,6 +585,40 @@ static struct rftype res_cache_info_files[] = {
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},
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};
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/* rdtgroup information files for memory bandwidth. */
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static struct rftype res_mba_info_files[] = {
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{
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.name = "num_closids",
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.mode = 0444,
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.kf_ops = &rdtgroup_kf_single_ops,
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.seq_show = rdt_num_closids_show,
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},
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{
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.name = "min_bandwidth",
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.mode = 0444,
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.kf_ops = &rdtgroup_kf_single_ops,
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.seq_show = rdt_min_bw_show,
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},
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{
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.name = "bandwidth_gran",
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.mode = 0444,
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.kf_ops = &rdtgroup_kf_single_ops,
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.seq_show = rdt_bw_gran_show,
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},
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{
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.name = "delay_linear",
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.mode = 0444,
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.kf_ops = &rdtgroup_kf_single_ops,
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.seq_show = rdt_delay_linear_show,
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},
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};
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void rdt_get_mba_infofile(struct rdt_resource *r)
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{
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r->info_files = res_mba_info_files;
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r->nr_info_files = ARRAY_SIZE(res_mba_info_files);
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}
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void rdt_get_cache_infofile(struct rdt_resource *r)
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{
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r->info_files = res_cache_info_files;
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