From: Michal Suchanek Date: Wed, 27 Nov 2019 22:09:59 +0000 (+0100) Subject: powerpc: add link stack flush mitigation status in debugfs. X-Git-Tag: v6.1-rc5~1734^2~154 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b2a6f6043577e09d51a4b5577fff9fc9f5b14b1c;p=platform%2Fkernel%2Flinux-starfive.git powerpc: add link stack flush mitigation status in debugfs. The link stack flush status is not visible in debugfs. It can be enabled even when count cache flush is disabled. Add separate file for its status. Signed-off-by: Michal Suchanek [mpe: Update for change to link_stack_flush_type] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20191127220959.6208-1-msuchanek@suse.de --- diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c index e159d40..d96fd14 100644 --- a/arch/powerpc/kernel/security.c +++ b/arch/powerpc/kernel/security.c @@ -747,14 +747,29 @@ static int count_cache_flush_get(void *data, u64 *val) return 0; } +static int link_stack_flush_get(void *data, u64 *val) +{ + if (link_stack_flush_type == BRANCH_CACHE_FLUSH_NONE) + *val = 0; + else + *val = 1; + + return 0; +} + DEFINE_DEBUGFS_ATTRIBUTE(fops_count_cache_flush, count_cache_flush_get, count_cache_flush_set, "%llu\n"); +DEFINE_DEBUGFS_ATTRIBUTE(fops_link_stack_flush, link_stack_flush_get, + count_cache_flush_set, "%llu\n"); static __init int count_cache_flush_debugfs_init(void) { debugfs_create_file_unsafe("count_cache_flush", 0600, arch_debugfs_dir, NULL, &fops_count_cache_flush); + debugfs_create_file_unsafe("link_stack_flush", 0600, + arch_debugfs_dir, NULL, + &fops_link_stack_flush); return 0; } device_initcall(count_cache_flush_debugfs_init);