x86/resctrl: Make resctrl_arch_rmid_read() return values in bytes
resctrl_arch_rmid_read() returns a value in chunks, as read from the hardware. This needs scaling to bytes by mon_scale, as provided by the architecture code. Now that resctrl_arch_rmid_read() performs the overflow and corrections itself, it may as well return a value in bytes directly. This allows the accesses to the architecture specific 'hw' structure to be removed. Move the mon_scale conversion into resctrl_arch_rmid_read(). mbm_bw_count() is updated to calculate bandwidth from bytes. 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/20220902154829.30399-22-james.morse@arm.com
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@ -549,7 +549,6 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
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int rdtgroup_mondata_show(struct seq_file *m, void *arg)
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{
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struct kernfs_open_file *of = m->private;
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struct rdt_hw_resource *hw_res;
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u32 resid, evtid, domid;
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struct rdtgroup *rdtgrp;
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struct rdt_resource *r;
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@ -569,8 +568,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
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domid = md.u.domid;
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evtid = md.u.evtid;
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hw_res = &rdt_resources_all[resid];
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r = &hw_res->r_resctrl;
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r = &rdt_resources_all[resid].r_resctrl;
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d = rdt_find_domain(r, domid, NULL);
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if (IS_ERR_OR_NULL(d)) {
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ret = -ENOENT;
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@ -584,7 +582,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
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else if (rr.err == -EINVAL)
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seq_puts(m, "Unavailable\n");
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else
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seq_printf(m, "%llu\n", rr.val * hw_res->mon_scale);
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seq_printf(m, "%llu\n", rr.val);
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out:
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rdtgroup_kn_unlock(of->kn);
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@ -279,13 +279,13 @@ struct rftype {
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/**
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* struct mbm_state - status for each MBM counter in each domain
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* @prev_bw_chunks: Previous chunks value read for bandwidth calculation
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* @prev_bw_bytes: Previous bytes value read for bandwidth calculation
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* @prev_bw: The most recent bandwidth in MBps
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* @delta_bw: Difference between the current and previous bandwidth
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* @delta_comp: Indicates whether to compute the delta_bw
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*/
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struct mbm_state {
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u64 prev_bw_chunks;
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u64 prev_bw_bytes;
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u32 prev_bw;
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u32 delta_bw;
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bool delta_comp;
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@ -16,6 +16,7 @@
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*/
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#include <linux/module.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <asm/cpu_device_id.h>
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@ -189,7 +190,7 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
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struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
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struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
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struct arch_mbm_state *am;
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u64 msr_val;
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u64 msr_val, chunks;
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if (!cpumask_test_cpu(smp_processor_id(), &d->cpu_mask))
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return -EINVAL;
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@ -214,12 +215,14 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
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if (am) {
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am->chunks += mbm_overflow_count(am->prev_msr, msr_val,
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hw_res->mbm_width);
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*val = get_corrected_mbm_count(rmid, am->chunks);
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chunks = get_corrected_mbm_count(rmid, am->chunks);
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am->prev_msr = msr_val;
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} else {
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*val = msr_val;
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chunks = msr_val;
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}
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*val = chunks * hw_res->mon_scale;
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return 0;
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}
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@ -232,7 +235,6 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
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void __check_limbo(struct rdt_domain *d, bool force_free)
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{
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struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
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struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
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struct rmid_entry *entry;
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u32 crmid = 1, nrmid;
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bool rmid_dirty;
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@ -255,7 +257,6 @@ void __check_limbo(struct rdt_domain *d, bool force_free)
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QOS_L3_OCCUP_EVENT_ID, &val)) {
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rmid_dirty = true;
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} else {
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val *= hw_res->mon_scale;
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rmid_dirty = (val >= resctrl_rmid_realloc_threshold);
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}
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@ -299,7 +300,6 @@ int alloc_rmid(void)
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static void add_rmid_to_limbo(struct rmid_entry *entry)
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{
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struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
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struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
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struct rdt_domain *d;
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int cpu, err;
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u64 val = 0;
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@ -311,7 +311,6 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
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err = resctrl_arch_rmid_read(r, d, entry->rmid,
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QOS_L3_OCCUP_EVENT_ID,
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&val);
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val *= hw_res->mon_scale;
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if (err || val <= resctrl_rmid_realloc_threshold)
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continue;
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}
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@ -403,15 +402,14 @@ static int __mon_event_count(u32 rmid, struct rmid_read *rr)
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*/
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static void mbm_bw_count(u32 rmid, struct rmid_read *rr)
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{
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struct rdt_hw_resource *hw_res = resctrl_to_arch_res(rr->r);
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struct mbm_state *m = &rr->d->mbm_local[rmid];
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u64 cur_bw, chunks, cur_chunks;
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u64 cur_bw, bytes, cur_bytes;
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cur_chunks = rr->val;
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chunks = cur_chunks - m->prev_bw_chunks;
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m->prev_bw_chunks = cur_chunks;
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cur_bytes = rr->val;
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bytes = cur_bytes - m->prev_bw_bytes;
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m->prev_bw_bytes = cur_bytes;
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cur_bw = (chunks * hw_res->mon_scale) >> 20;
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cur_bw = bytes / SZ_1M;
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if (m->delta_comp)
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m->delta_bw = abs(cur_bw - m->prev_bw);
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@ -227,7 +227,7 @@ void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d);
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* @d: domain that the counter should be read from.
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* @rmid: rmid of the counter to read.
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* @eventid: eventid to read, e.g. L3 occupancy.
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* @val: result of the counter read in chunks.
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* @val: result of the counter read in bytes.
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*
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* Call from process context on a CPU that belongs to domain @d.
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*
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