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Subject[tip:x86/cache] x86/resctrl: Initialize a new resource group with default MBA values
Commit-ID:  47820e73f5b3a1fdb8ebd1219191edc96e0c85c1
Gitweb: https://git.kernel.org/tip/47820e73f5b3a1fdb8ebd1219191edc96e0c85c1
Author: Xiaochen Shen <xiaochen.shen@intel.com>
AuthorDate: Wed, 17 Apr 2019 19:08:49 +0800
Committer: Borislav Petkov <bp@suse.de>
CommitDate: Thu, 18 Apr 2019 00:06:31 +0200

x86/resctrl: Initialize a new resource group with default MBA values

Currently, when a new resource group is created, the allocation values
of the MBA resource are not initialized and remain meaningless data.

For example:

mkdir /sys/fs/resctrl/p1
cat /sys/fs/resctrl/p1/schemata
MB:0=100;1=100

echo "MB:0=10;1=20" > /sys/fs/resctrl/p1/schemata
cat /sys/fs/resctrl/p1/schemata
MB:0= 10;1= 20

rmdir /sys/fs/resctrl/p1
mkdir /sys/fs/resctrl/p2
cat /sys/fs/resctrl/p2/schemata
MB:0= 10;1= 20

Therefore, when the new group is created, it is reasonable to initialize
MBA resource with default values.

Initialize the MBA resource and cache resources in separate functions.

[ bp: Add newlines between code blocks for better readability. ]

Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: pei.p.jia@intel.com
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/1555499329-1170-3-git-send-email-xiaochen.shen@intel.com
---
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 4 +--
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 52 ++++++++++++++++++++-----------
2 files changed, 35 insertions(+), 21 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 2dbd990a2eb7..89320c0396b1 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -342,10 +342,10 @@ int update_domains(struct rdt_resource *r, int closid)
if (cpumask_empty(cpu_mask) || mba_sc)
goto done;
cpu = get_cpu();
- /* Update CBM on this cpu if it's in cpu_mask. */
+ /* Update resource control msr on this CPU if it's in cpu_mask. */
if (cpumask_test_cpu(cpu, cpu_mask))
rdt_ctrl_update(&msr_param);
- /* Update CBM on other cpus. */
+ /* Update resource control msr on other CPUs. */
smp_call_function_many(cpu_mask, rdt_ctrl_update, &msr_param, 1);
put_cpu();

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 36ace51ee705..333c177a2471 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2581,8 +2581,8 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct rdt_resource *r,
return 0;
}

-/**
- * rdtgroup_init_alloc - Initialize the new RDT group's allocations
+/*
+ * Initialize cache resources with default values.
*
* A new RDT group is being created on an allocation capable (CAT)
* supporting system. Set this group up to start off with all usable
@@ -2591,38 +2591,52 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct rdt_resource *r,
* If there are no more shareable bits available on any domain then
* the entire allocation will fail.
*/
+static int rdtgroup_init_cat(struct rdt_resource *r, u32 closid)
+{
+ struct rdt_domain *d;
+ int ret;
+
+ list_for_each_entry(d, &r->domains, list) {
+ ret = __init_one_rdt_domain(d, r, closid);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+/* Initialize MBA resource with default values. */
+static void rdtgroup_init_mba(struct rdt_resource *r)
+{
+ struct rdt_domain *d;
+
+ list_for_each_entry(d, &r->domains, list) {
+ d->new_ctrl = is_mba_sc(r) ? MBA_MAX_MBPS : r->default_ctrl;
+ d->have_new_ctrl = true;
+ }
+}
+
+/* Initialize the RDT group's allocations. */
static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
{
struct rdt_resource *r;
- struct rdt_domain *d;
int ret;

for_each_alloc_enabled_rdt_resource(r) {
- /*
- * Only initialize default allocations for CBM cache
- * resources
- */
- if (r->rid == RDT_RESOURCE_MBA)
- continue;
- list_for_each_entry(d, &r->domains, list) {
- ret = __init_one_rdt_domain(d, r, rdtgrp->closid);
+ if (r->rid == RDT_RESOURCE_MBA) {
+ rdtgroup_init_mba(r);
+ } else {
+ ret = rdtgroup_init_cat(r, rdtgrp->closid);
if (ret < 0)
return ret;
}
- }

- for_each_alloc_enabled_rdt_resource(r) {
- /*
- * Only initialize default allocations for CBM cache
- * resources
- */
- if (r->rid == RDT_RESOURCE_MBA)
- continue;
ret = update_domains(r, rdtgrp->closid);
if (ret < 0) {
rdt_last_cmd_puts("Failed to initialize allocations\n");
return ret;
}
+
}

rdtgrp->mode = RDT_MODE_SHAREABLE;
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