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Message-Id: <20210729223610.29373-6-james.morse@arm.com>
Date: Thu, 29 Jul 2021 22:35:55 +0000
From: James Morse <james.morse@....com>
To: x86@...nel.org, linux-kernel@...r.kernel.org
Cc: Fenghua Yu <fenghua.yu@...el.com>,
Reinette Chatre <reinette.chatre@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
H Peter Anvin <hpa@...or.com>,
Babu Moger <Babu.Moger@....com>,
James Morse <james.morse@....com>,
shameerali.kolothum.thodi@...wei.com,
Jamie Iles <jamie@...iainc.com>,
D Scott Phillips OS <scott@...amperecomputing.com>,
lcherian@...vell.com, bobo.shaobowang@...wei.com
Subject: [PATCH v1 05/20] x86/resctrl: Create mba_sc configuration in the rdt_domain
To support resctrl's MBA software controller, the architecture must provide
a second configuration array to hold the mbps_val from user-space.
This complicates the interface between the architecture code.
Make the filesystem parts of resctrl create an array for the mba_sc
values when the struct resctrl_schema is created. The software controller
can be changed to use this, allowing the architecture code to only
consider the values configured in hardware.
Signed-off-by: James Morse <james.morse@....com>
---
arch/x86/kernel/cpu/resctrl/internal.h | 1 -
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 69 ++++++++++++++++++++++++++
include/linux/resctrl.h | 13 +++++
3 files changed, 82 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index e12b55f815bf..a7e2cbce29d5 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -36,7 +36,6 @@
#define MBM_OVERFLOW_INTERVAL 1000
#define MAX_MBA_BW 100u
#define MBA_IS_LINEAR 0x4
-#define MBA_MAX_MBPS U32_MAX
#define MAX_MBA_BW_AMD 0x800
#define MBM_CNTR_WIDTH_OFFSET_AMD 20
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index cf0db0b7a5d0..185f9bb992d1 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2030,6 +2030,60 @@ static int mkdir_mondata_all(struct kernfs_node *parent_kn,
struct rdtgroup *prgrp,
struct kernfs_node **mon_data_kn);
+static int mba_sc_domain_allocate(struct rdt_resource *res,
+ struct rdt_domain *d)
+{
+ u32 num_closid = closid_free_map_len;
+ int cpu = cpumask_any(&d->cpu_mask);
+ int i;
+
+ d->mba_sc = kcalloc_node(num_closid, sizeof(*d->mba_sc),
+ GFP_KERNEL, cpu_to_node(cpu));
+ if (!d->mba_sc)
+ return -ENOMEM;
+
+ for (i = 0; i < num_closid; i++)
+ d->mba_sc[i].mbps_val = MBA_MAX_MBPS;
+
+ return 0;
+}
+
+static int mba_sc_allocate(struct rdt_resource *r)
+{
+ struct rdt_domain *d;
+ int ret;
+
+ lockdep_assert_cpus_held();
+
+ if (!is_mba_sc(r))
+ return 0;
+
+ list_for_each_entry(d, &r->domains, list) {
+ ret = mba_sc_domain_allocate(r, d);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+static void mba_sc_domain_destroy(struct rdt_resource *r,
+ struct rdt_domain *d)
+{
+ kfree(d->mba_sc);
+ d->mba_sc = NULL;
+}
+
+static void mba_sc_destroy(struct rdt_resource *r)
+{
+ struct rdt_domain *d;
+
+ lockdep_assert_cpus_held();
+
+ list_for_each_entry(d, &r->domains, list)
+ mba_sc_domain_destroy(r, d);
+}
+
static int rdt_enable_ctx(struct rdt_fs_context *ctx)
{
int ret = 0;
@@ -2117,17 +2171,27 @@ static int schemata_list_create(void)
if (ret)
break;
+
+ ret = mba_sc_allocate(r);
+ if (ret)
+ break;
}
return ret;
}
+/*
+ * During rdt_kill_sb(), the mba_sc state is reset before
+ * destroy_schemata_list() is called: unconditionally try to free the
+ * array.
+ */
static void schemata_list_destroy(void)
{
struct resctrl_schema *s, *tmp;
list_for_each_entry_safe(s, tmp, &resctrl_schema_all, list) {
list_del(&s->list);
+ mba_sc_destroy(s->res);
kfree(s);
}
}
@@ -3255,6 +3319,8 @@ void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
__check_limbo(d, true);
cancel_delayed_work(&d->cqm_limbo);
}
+ if (static_branch_unlikely(&rdt_enable_key) && is_mba_sc(r))
+ mba_sc_domain_destroy(r, d);
bitmap_free(d->rmid_busy_llc);
kfree(d->mbm_total);
kfree(d->mbm_local);
@@ -3287,6 +3353,9 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
}
}
+ if (is_mba_sc(r))
+ mba_sc_domain_allocate(r, d);
+
return 0;
}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 7aeeb4ac6bcc..3c8522d63261 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -15,6 +15,9 @@ int proc_resctrl_show(struct seq_file *m,
#endif
+/* max value for struct resctrl_mba_sc's mbps_val */
+#define MBA_MAX_MBPS U32_MAX
+
/**
* enum resctrl_conf_type - The type of configuration.
* @CDP_NONE: No prioritisation, both code and data are controlled or monitored.
@@ -39,6 +42,14 @@ struct resctrl_staged_config {
bool have_new_ctrl;
};
+/**
+ * struct resctrl_mba_sc - per-closid values for the control loop
+ * @mbps_val: The user's specified control value
+ */
+struct resctrl_mba_sc {
+ u32 mbps_val;
+};
+
/**
* struct rdt_domain - group of CPUs sharing a resctrl resource
* @list: all instances of this resource
@@ -53,6 +64,7 @@ struct resctrl_staged_config {
* @cqm_work_cpu: worker CPU for CQM h/w counters
* @plr: pseudo-locked region (if any) associated with domain
* @staged_config: parsed configuration to be applied
+ * @mba_sc: the mba software controller properties, indexed by closid
*/
struct rdt_domain {
struct list_head list;
@@ -67,6 +79,7 @@ struct rdt_domain {
int cqm_work_cpu;
struct pseudo_lock_region *plr;
struct resctrl_staged_config staged_config[CDP_NUM_TYPES];
+ struct resctrl_mba_sc *mba_sc;
};
/**
--
2.30.2
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