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From: Dave Martin <Dave.Martin@arm.com>
To: x86@kernel.org,
	linux-kernel@vger.kernel.org
Cc: James Morse <james.morse@arm.com>,
	Fenghua Yu <fenghua.yu@intel.com>,
	Reinette Chatre <reinette.chatre@intel.com>,
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Subject: [PATCH v2 24/35] x86/resctrl: Move get_config_index() to a header
Date: Fri, 26 Apr 2024 16:08:53 +0100
Message-Id: <20240426150904.8854-24-Dave.Martin@arm.com>
In-Reply-To: <20240426150904.8854-1-Dave.Martin@arm.com>
References: <20240426150537.8094-1-Dave.Martin@arm.com>
 <20240426150904.8854-1-Dave.Martin@arm.com>
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From: James Morse <james.morse@arm.com>

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>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>

---

Changes in v2:

 * Reindent resctrl_get_config_index() as per coding-style.rst rules.

 * Remove redundant parentheses from arithmetic in
   resctrl_get_config_index(), so as to match the original source
   version of this moved code.

   No functional change.
---
 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 18ef7de0aa47..7bbed5d8a155 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -269,6 +269,21 @@ 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.
-- 
2.34.1