Commit 7da6ee0f authored Apr 16, 2024 by Zeng Heng

arm64/mpam: Not allowed setting 0 to cache portion bit mask

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I9H4YE



--------------------------------

Not allowed cache portion to be set to 0, and this kind of operation is
not supported by hardware.

Fixes: 58e843d9 ("arm64/mpam: resctrl: Support priority and hardlimit(Memory bandwidth) configuration")
Signed-off-by: Zeng Heng <zengheng4@huawei.com>

parent b152f5a5

arch/arm64/kernel/mpam/mpam_resctrl.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -321,6 +321,11 @@ parse_cache(char buf, struct resctrl_resource r,
		if (data >= rr->ctrl_features[type].max_wd)
		return -EINVAL;

		if (type == SCHEMA_COMM && data == 0) {
		rdt_last_cmd_puts("No allowed CPBM to be set to 0\n");
		return -EINVAL;
		}

		cfg->new_ctrl[type] = data;
		cfg->ctrl_updated[type] = true;
		cfg->have_new_ctrl = true;