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x86/resctrl: Add an arch helper to reset one resource

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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.

Make reset_all_ctrls() an arch helper that resets one resource.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-15-james.morse@arm.com
This commit is contained in:
James Morse 2025-03-11 18:36:59 +00:00 committed by Borislav Petkov (AMD)
parent f16adbaf92
commit 9be68b144a
2 changed files with 14 additions and 4 deletions
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9
arch/x86/kernel/cpu/resctrl/rdtgroup.c
View File

@ -2867,7 +2867,7 @@ static int rdt_init_fs_context(struct fs_context *fc)
return 0;
}
static int reset_all_ctrls(struct rdt_resource *r)
void resctrl_arch_reset_all_ctrls(struct rdt_resource *r)
{
struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
struct rdt_hw_ctrl_domain *hw_dom;
@ -2896,7 +2896,7 @@ static int reset_all_ctrls(struct rdt_resource *r)
smp_call_function_any(&d->hdr.cpu_mask, rdt_ctrl_update, &msr_param, 1);
}
return 0;
return;
}
/*
@ -3015,9 +3015,10 @@ static void rdt_kill_sb(struct super_block *sb)
rdt_disable_ctx();
/*Put everything back to default values. */
/* Put everything back to default values. */
for_each_alloc_capable_rdt_resource(r)
reset_all_ctrls(r);
resctrl_arch_reset_all_ctrls(r);
rmdir_all_sub();
rdt_pseudo_lock_release();
rdtgroup_default.mode = RDT_MODE_SHAREABLE;

9
include/linux/resctrl.h
View File

@ -394,6 +394,15 @@ void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_mon_domain *d,
*/
void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_mon_domain *d);
/**
* resctrl_arch_reset_all_ctrls() - Reset the control for each CLOSID to its
* default.
* @r: The resctrl resource to reset.
*
* This can be called from any CPU.
*/
void resctrl_arch_reset_all_ctrls(struct rdt_resource *r);
extern unsigned int resctrl_rmid_realloc_threshold;
extern unsigned int resctrl_rmid_realloc_limit;