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Message-ID: <7a24bb182897acab3daaac1cadaabca3bcc73dc5.1725488488.git.babu.moger@amd.com>
Date: Wed, 4 Sep 2024 17:21:27 -0500
From: Babu Moger <babu.moger@....com>
To: <corbet@....net>, <fenghua.yu@...el.com>, <reinette.chatre@...el.com>,
<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
<dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
<rdunlap@...radead.org>, <tj@...nel.org>, <peterz@...radead.org>,
<yanjiewtw@...il.com>, <babu.moger@....com>, <kim.phillips@....com>,
<lukas.bulwahn@...il.com>, <seanjc@...gle.com>, <jmattson@...gle.com>,
<leitao@...ian.org>, <jpoimboe@...nel.org>, <rick.p.edgecombe@...el.com>,
<kirill.shutemov@...ux.intel.com>, <jithu.joseph@...el.com>,
<kai.huang@...el.com>, <kan.liang@...ux.intel.com>,
<daniel.sneddon@...ux.intel.com>, <pbonzini@...hat.com>,
<sandipan.das@....com>, <ilpo.jarvinen@...ux.intel.com>,
<peternewman@...gle.com>, <maciej.wieczor-retman@...el.com>,
<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<eranian@...gle.com>, <james.morse@....com>
Subject: [PATCH v7 12/24] x86/resctrl: Introduce mbm_cntr_map to track counters at domain
The MBM counters are allocated globally and assigned to RMID, event pair
in a resctrl group. It is tracked by mbm_cntr_free_map. Then it is
assigned to the domain based on the user input. It needs to be tracked
at domain level also.
Add the mbm_cntr_map bitmap in struct rdt_mon_domain to keep track of
assignment at domain level. The global counter at mbm_cntr_free_map can
be released when assignment at all the domains are cleared.
Signed-off-by: Babu Moger <babu.moger@....com>
---
v7: Added check mbm_cntr_assignable for allocating bitmap mbm_cntr_map
v6: New patch to add domain level assignment.
---
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 10 ++++++++++
include/linux/resctrl.h | 2 ++
2 files changed, 12 insertions(+)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index cc101fbe8683..a014d5f4c0b3 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4092,6 +4092,7 @@ static void __init rdtgroup_setup_default(void)
static void domain_destroy_mon_state(struct rdt_mon_domain *d)
{
+ bitmap_free(d->mbm_cntr_map);
bitmap_free(d->rmid_busy_llc);
kfree(d->mbm_total);
kfree(d->mbm_local);
@@ -4165,6 +4166,15 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_mon_domain
return -ENOMEM;
}
}
+ if (is_mbm_enabled() && r->mon.mbm_cntr_assignable) {
+ d->mbm_cntr_map = bitmap_zalloc(r->mon.num_mbm_cntrs, GFP_KERNEL);
+ if (!d->mbm_cntr_map) {
+ bitmap_free(d->rmid_busy_llc);
+ kfree(d->mbm_total);
+ kfree(d->mbm_local);
+ return -ENOMEM;
+ }
+ }
return 0;
}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 757708cf5d3c..882a6ec55f27 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -105,6 +105,7 @@ struct rdt_ctrl_domain {
* @cqm_limbo: worker to periodically read CQM h/w counters
* @mbm_work_cpu: worker CPU for MBM h/w counters
* @cqm_work_cpu: worker CPU for CQM h/w counters
+ * @mbm_cntr_map: bitmap to track domain counter assignment
*/
struct rdt_mon_domain {
struct rdt_domain_hdr hdr;
@@ -116,6 +117,7 @@ struct rdt_mon_domain {
struct delayed_work cqm_limbo;
int mbm_work_cpu;
int cqm_work_cpu;
+ unsigned long *mbm_cntr_map;
};
/**
--
2.34.1
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