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Message-Id: <20240802172853.22529-17-james.morse@arm.com>
Date: Fri, 2 Aug 2024 17:28:30 +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,
D Scott Phillips OS <scott@...amperecomputing.com>,
carl@...amperecomputing.com,
lcherian@...vell.com,
bobo.shaobowang@...wei.com,
tan.shaopeng@...itsu.com,
baolin.wang@...ux.alibaba.com,
Jamie Iles <quic_jiles@...cinc.com>,
Xin Hao <xhao@...ux.alibaba.com>,
peternewman@...gle.com,
dfustini@...libre.com,
amitsinght@...vell.com,
David Hildenbrand <david@...hat.com>,
Rex Nie <rex.nie@...uarmicro.com>,
Dave Martin <dave.martin@....com>
Subject: [PATCH v4 16/39] x86/resctrl: Move monitor init work to a resctrl init call
rdt_get_mon_l3_config() is called from the architecture's
resctrl_arch_late_init(), and initialises both architecture specific
fields, such as hw_res->mon_scale and resctrl filesystem fields
by calling dom_data_init().
To separate the filesystem and architecture parts of resctrl, this
function needs splitting up.
Add resctrl_mon_resource_init() to do the filesystem specific work,
and call it from resctrl_init(). This runs later, but is still before
the filesystem is mounted and the rmid_ptrs[] array can be used.
Signed-off-by: James Morse <james.morse@....com>
Tested-by: Carl Worth <carl@...amperecomputing.com> # arm64
---
Changes since v3:
* Added a comment over resctrl_mon_resource_init().
* Added a comment over domain_setup_mon_state() to warn of cpuhp ordering.
* Added __init to resctrl_mon_resource_init().
Changes since v2:
* Added error handling for the case sysfs files can't be created.
---
arch/x86/kernel/cpu/resctrl/internal.h | 1 +
arch/x86/kernel/cpu/resctrl/monitor.c | 36 +++++++++++++++++++++-----
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 22 +++++++++++++++-
3 files changed, 51 insertions(+), 8 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 3fdeca6e3d21..8e52e81a044b 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -586,6 +586,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg);
void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
cpumask_t *cpumask, int evtid, int first);
+int __init resctrl_mon_resource_init(void);
void mbm_setup_overflow_handler(struct rdt_mon_domain *dom,
unsigned long delay_ms,
int exclude_cpu);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index afbda09aacf5..cecc96213c49 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1179,12 +1179,40 @@ static __init int snc_get_config(void)
return ret;
}
+/**
+ * resctrl_mon_resource_init() - Initialise global monitoring structures.
+ *
+ * Allocate and initialise global monitor resources that do not belong to a
+ * specific domain. i.e. the rmid_ptrs[] used for the limbo and free lists.
+ * Called once during boot after the struct rdt_resource's have been configured
+ * but before the filesystem is mounted.
+ * Resctrl's cpuhp callbacks may be called before this point to bring a domain
+ * online.
+ *
+ * Returns 0 for success, or -ENOMEM.
+ */
+int __init resctrl_mon_resource_init(void)
+{
+ struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+ int ret;
+
+ if (!r->mon_capable)
+ return 0;
+
+ ret = dom_data_init(r);
+ if (ret)
+ return ret;
+
+ l3_mon_evt_init(r);
+
+ return 0;
+}
+
int __init 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 threshold;
- int ret;
snc_nodes_per_l3_cache = snc_get_config();
@@ -1214,10 +1242,6 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
*/
resctrl_rmid_realloc_threshold = resctrl_arch_round_mon_val(threshold);
- ret = dom_data_init(r);
- if (ret)
- return ret;
-
if (rdt_cpu_has(X86_FEATURE_BMEC)) {
u32 eax, ebx, ecx, edx;
@@ -1235,8 +1259,6 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
}
}
- l3_mon_evt_init(r);
-
r->mon_capable = true;
return 0;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 576f6b183980..f53d6ce390ac 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4097,6 +4097,19 @@ void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d
mutex_unlock(&rdtgroup_mutex);
}
+/**
+ * domain_setup_mon_state() - Initialise domain monitoring structures.
+ * @r: The resource for the newly online domain.
+ * @d: The newly online domain.
+ *
+ * Allocate monitor resources that belong to this domain.
+ * Called when the first CPU of a domain comes online, regardless of whether
+ * the filesystem is mounted.
+ * During boot this may be called before global allocations have been made by
+ * resctrl_mon_resource_init().
+ *
+ * Returns 0 for success, or -ENOMEM.
+ */
static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_mon_domain *d)
{
u32 idx_limit = resctrl_arch_system_num_rmid_idx();
@@ -4247,9 +4260,15 @@ int __init resctrl_init(void)
rdtgroup_setup_default();
+ ret = resctrl_mon_resource_init();
+ if (ret)
+ return ret;
+
ret = sysfs_create_mount_point(fs_kobj, "resctrl");
- if (ret)
+ if (ret) {
+ resctrl_mon_resource_exit();
return ret;
+ }
ret = register_filesystem(&rdt_fs_type);
if (ret)
@@ -4282,6 +4301,7 @@ int __init resctrl_init(void)
cleanup_mountpoint:
sysfs_remove_mount_point(fs_kobj, "resctrl");
+ resctrl_mon_resource_exit();
return ret;
}
--
2.39.2
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