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Message-Id: <20240426150904.8854-9-Dave.Martin@arm.com>
Date: Fri, 26 Apr 2024 16:08:38 +0100
From: Dave Martin <Dave.Martin@....com>
To: x86@...nel.org,
linux-kernel@...r.kernel.org
Cc: James Morse <james.morse@....com>,
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>,
shameerali.kolothum.thodi@...wei.com,
D Scott Phillips OS <scott@...amperecomputing.com>,
carl@...amperecomputing.com,
lcherian@...vell.com,
bobo.shaobowang@...wei.com,
"Shaopeng Tan (Fujitsu)" <tan.shaopeng@...itsu.com>,
baolin.wang@...ux.alibaba.com,
Jamie Iles <quic_jiles@...cinc.com>,
Xin Hao <xhao@...ux.alibaba.com>,
Peter Newman <peternewman@...gle.com>,
dfustini@...libre.com,
amitsinght@...vell.com,
David Hildenbrand <david@...hat.com>,
Rex Nie <rex.nie@...uarmicro.com>
Subject: [PATCH v2 09/35] x86/resctrl: Add a resctrl helper to reset all the resources
From: James Morse <james.morse@....com>
On umount(), resctrl resets each resource back to its default
configuration. It only ever does this for all resources in one go.
reset_all_ctrls() is architecture specific as it works with struct
rdt_hw_resource.
Add an architecture helper to reset all resources.
Signed-off-by: James Morse <james.morse@....com>
Signed-off-by: Dave Martin <Dave.Martin@....com>
---
FYI: James Morse:
* Review the v2 change detailed below. If the original change in v1
was intentional, the rationale needs to be spelled out.
Changes in v2:
* Rename the for_each_capable_rdt_resource() introduced in the new
function resctrl_arch_reset_resources(), back to
for_each_alloc_capable_rdt_resource() as it was in the original code.
The change looked unintentional; and presumably a resource that does
not support resource allocation doesn't have any properties to
reset...
---
arch/x86/include/asm/resctrl.h | 2 ++
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 16 +++++++++++-----
2 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index f61382258743..5f6a5375bb4a 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -15,6 +15,8 @@
*/
#define X86_RESCTRL_EMPTY_CLOSID ((u32)~0)
+void resctrl_arch_reset_resources(void);
+
/**
* struct resctrl_pqr_state - State cache for the PQR MSR
* @cur_rmid: The cached Resource Monitoring ID
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 997f31ee5de4..2684a863c727 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2858,6 +2858,14 @@ static int reset_all_ctrls(struct rdt_resource *r)
return 0;
}
+void resctrl_arch_reset_resources(void)
+{
+ struct rdt_resource *r;
+
+ for_each_alloc_capable_rdt_resource(r)
+ reset_all_ctrls(r);
+}
+
/*
* Move tasks from one to the other group. If @from is NULL, then all tasks
* in the systems are moved unconditionally (used for teardown).
@@ -2967,16 +2975,14 @@ static void rmdir_all_sub(void)
static void rdt_kill_sb(struct super_block *sb)
{
- struct rdt_resource *r;
-
cpus_read_lock();
mutex_lock(&rdtgroup_mutex);
rdt_disable_ctx();
- /*Put everything back to default values. */
- for_each_alloc_capable_rdt_resource(r)
- reset_all_ctrls(r);
+ /* Put everything back to default values. */
+ resctrl_arch_reset_resources();
+
rmdir_all_sub();
rdt_pseudo_lock_release();
rdtgroup_default.mode = RDT_MODE_SHAREABLE;
--
2.34.1
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