[RFC PATCH 07/10] arm_mpam: Generalize the fixed-point conversion helpers

[Jinjie Ruan]

mbw_max_to_percent() and percent_to_mbw_max() open-code the width in
cprops->bwa_wd. Split the conversion into a helper that takes the width
and keep the mbw wrappers, so the CMAX/CMIN controls, which use the
same fixed-point format but are cmax_wd bits wide, can reuse it.

No functional change.

Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
---
 drivers/resctrl/mpam_resctrl.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/resctrl/mpam_resctrl.c b/drivers/resctrl/mpam_resctrl.c
index 9d223057953a..dcdbf0404f07 100644
--- a/drivers/resctrl/mpam_resctrl.c
+++ b/drivers/resctrl/mpam_resctrl.c
@@ -739,18 +739,23 @@ static u32 get_mba_granularity(struct mpam_props *cprops)
  *
  * Find the nearest percentage value to the upper bound of the selected band:
  */
-static u32 mbw_max_to_percent(u16 mbw_max, struct mpam_props *cprops)
+static u32 __mbw_max_to_percent(u16 mbw_max, u8 wd)
 {
 	u32 val = mbw_max;
 
-	val >>= 16 - cprops->bwa_wd;
+	val >>= 16 - wd;
 	val += 1;
 	val *= MAX_MBA_BW;
-	val = DIV_ROUND_CLOSEST(val, 1 << cprops->bwa_wd);
+	val = DIV_ROUND_CLOSEST(val, 1 << wd);
 
 	return val;
 }
 
+static u32 mbw_max_to_percent(u16 mbw_max, struct mpam_props *cprops)
+{
+	return __mbw_max_to_percent(mbw_max, cprops->bwa_wd);
+}
+
 /*
  * Find the band whose upper bound is closest to the specified percentage.
  *
@@ -761,18 +766,23 @@ static u32 mbw_max_to_percent(u16 mbw_max, struct mpam_props *cprops)
  * percentages) and over-commit (where the total of the converted
  * allocations is greater than expected).
  */
-static u16 percent_to_mbw_max(u8 pc, struct mpam_props *cprops)
+static u16 __percent_to_mbw_max(u8 pc, u8 wd)
 {
 	u32 val = pc;
 
-	val <<= cprops->bwa_wd;
+	val <<= wd;
 	val = DIV_ROUND_CLOSEST(val, MAX_MBA_BW);
 	val = max(val, 1) - 1;
-	val <<= 16 - cprops->bwa_wd;
+	val <<= 16 - wd;
 
 	return val;
 }
 
+static u16 percent_to_mbw_max(u8 pc, struct mpam_props *cprops)
+{
+	return __percent_to_mbw_max(pc, cprops->bwa_wd);
+}
+
 static u32 get_mba_min(struct mpam_props *cprops)
 {
 	if (!mba_class_use_mbw_max(cprops)) {
-- 
2.34.1