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x86/resctrl: Handle throttle_mode for SMBA resources

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Now that the visibility of throttle_mode is being managed by resctrl, it
should consider resources other than MBA that may have a throttle_mode.  SMBA
is one such resource.

Extend thread_throttle_mode_init() to check SMBA for a throttle_mode.

Adding support for multiple resources means it is possible for a platform with
both MBA and SMBA, but an undefined throttle_mode on one of them to make the
file visible.

Add the 'undefined' case to rdt_thread_throttle_mode_show().

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
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/20250311183715.16445-29-james.morse@arm.com
This commit is contained in:
James Morse 2025-03-11 18:37:13 +00:00 committed by Borislav Petkov (AMD)
parent 373af4ecfd
commit 6c2282d42c
1 changed files with 27 additions and 6 deletions
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33
arch/x86/kernel/cpu/resctrl/rdtgroup.c
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@ -1188,10 +1188,19 @@ static int rdt_thread_throttle_mode_show(struct kernfs_open_file *of,
struct resctrl_schema *s = of->kn->parent->priv;
struct rdt_resource *r = s->res;
if (r->membw.throttle_mode == THREAD_THROTTLE_PER_THREAD)
switch (r->membw.throttle_mode) {
case THREAD_THROTTLE_PER_THREAD:
seq_puts(seq, "per-thread\n");
else
return 0;
case THREAD_THROTTLE_MAX:
seq_puts(seq, "max\n");
return 0;
case THREAD_THROTTLE_UNDEFINED:
seq_puts(seq, "undefined\n");
return 0;
}
WARN_ON_ONCE(1);
return 0;
}
@ -2066,12 +2075,24 @@ static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
static void thread_throttle_mode_init(void)
{
struct rdt_resource *r_mba;
enum membw_throttle_mode throttle_mode = THREAD_THROTTLE_UNDEFINED;
struct rdt_resource *r_mba, *r_smba;
r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
if (r_mba->membw.throttle_mode != THREAD_THROTTLE_UNDEFINED)
resctrl_file_fflags_init("thread_throttle_mode",
RFTYPE_CTRL_INFO | RFTYPE_RES_MB);
if (r_mba->alloc_capable &&
r_mba->membw.throttle_mode != THREAD_THROTTLE_UNDEFINED)
throttle_mode = r_mba->membw.throttle_mode;
r_smba = resctrl_arch_get_resource(RDT_RESOURCE_SMBA);
if (r_smba->alloc_capable &&
r_smba->membw.throttle_mode != THREAD_THROTTLE_UNDEFINED)
throttle_mode = r_smba->membw.throttle_mode;
if (throttle_mode == THREAD_THROTTLE_UNDEFINED)
return;
resctrl_file_fflags_init("thread_throttle_mode",
RFTYPE_CTRL_INFO | RFTYPE_RES_MB);
}
void resctrl_file_fflags_init(const char *config, unsigned long fflags)