[PATCH v1 24/31] x86/resctrl: Move get_config_index() to a header

James Morse
2024-03-21T16:52:47Z

get_config_index() is used by the architecture specific code to map a
CLOSID+type pair to an index in the configuration arrays.

MPAM needs to do this too to preserve the ABI to user-space, there is
no reason to do it differently.

Move the helper to a header file.

Signed-off-by: James Morse <james.morse@arm.com>
---
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 19 +++----------------
include/linux/resctrl.h | 15 +++++++++++++++
2 files changed, 18 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 3603ade95f1d..b4627ae19291 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -277,19 +277,6 @@ static int parse_line(char *line, struct resctrl_schema *s,
return -EINVAL;
}

-static u32 get_config_index(u32 closid, enum resctrl_conf_type type)
-{
- switch (type) {
- default:
- case CDP_NONE:
- return closid;
- case CDP_CODE:
- return closid * 2 + 1;
- case CDP_DATA:
- return closid * 2;
- }
-}
-
static bool apply_config(struct rdt_hw_domain *hw_dom,
struct resctrl_staged_config *cfg, u32 idx,
cpumask_var_t cpu_mask)
@@ -311,7 +298,7 @@ int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
{
struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
- u32 idx = get_config_index(closid, t);
+ u32 idx = resctrl_get_config_index(closid, t);
struct msr_param msr_param;

if (!cpumask_test_cpu(smp_processor_id(), &d->cpu_mask))
@@ -351,7 +338,7 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
if (!cfg->have_new_ctrl)
continue;

- idx = get_config_index(closid, t);
+ idx = resctrl_get_config_index(closid, t);
if (!apply_config(hw_dom, cfg, idx, cpu_mask))
continue;

@@ -476,7 +463,7 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
u32 closid, enum resctrl_conf_type type)
{
struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
- u32 idx = get_config_index(closid, type);
+ u32 idx = resctrl_get_config_index(closid, type);

return hw_dom->ctrl_val[idx];
}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 3de5bc63ace0..73c111963433 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -258,6 +258,21 @@ bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt);
void resctrl_arch_mon_event_config_write(void *info);
void resctrl_arch_mon_event_config_read(void *info);

+/* For use by arch code to remap resctrl's smaller CDP CLOSID range */
+static inline u32 resctrl_get_config_index(u32 closid,
+ enum resctrl_conf_type type)
+{
+ switch (type) {
+ default:
+ case CDP_NONE:
+ return closid;
+ case CDP_CODE:
+ return (closid * 2) + 1;
+ case CDP_DATA:
+ return (closid * 2);
+ }
+}
+
/*
* Update the ctrl_val and apply this config right now.
* Must be called on one of the domain's CPUs.
--
2.39.2