linux-kernel - [RFC 04/12] fs/resctrl: Obtain CPBM upon priority partition presence

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Message-ID: <20230815152712.1760046-5-amitsinght@marvell.com>
Date:   Tue, 15 Aug 2023 20:57:04 +0530
From:   Amit Singh Tomar <amitsinght@...vell.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <fenghua.yu@...el.com>, <reinette.chatre@...el.com>,
        <james.morse@....com>, <gcherian@...vell.com>, <robh@...nel.org>,
        <peternewman@...gle.com>, Amit Singh Tomar <amitsinght@...vell.com>
Subject: [RFC 04/12] fs/resctrl: Obtain CPBM upon priority partition presence

Resource control group's "schemata" file represents the cache portion
bit map (XXXX), parsed from buffer with "L3:0=XXXX" format. Now, with
the introduction of priority control, "schemata" file format has changed
to "L3:0=XXXX,X", where cpbm (XXXX) is split from priority mask(X) using
using delimiter ",".

With this change, CPBM is properly fetched from schemata file when priority
partition support is present.

Signed-off-by: Amit Singh Tomar <amitsinght@...vell.com>
---
 fs/resctrl/ctrlmondata.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index 27d8bc25a4cb..b19ac2509e38 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -108,6 +108,9 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
 	unsigned int cbm_len = r->cache.cbm_len;
 	int ret;
 
+	if (r->priority_cap)
+		buf = strsep(&buf, ",");
+
 	ret = kstrtoul(buf, 16, &val);
 	if (ret) {
 		rdt_last_cmd_printf("Non-hex character in the mask %s\n", buf);
-- 
2.25.1