rdt_enable_ctx() enables the features provided during resctrl mount. Additions to rdt_enable_ctx() are required to also modify error paths of rdt_enable_ctx() callers to ensure correct unwinding if errors are encountered after calling rdt_enable_ctx(). This is error prone. Introduce rdt_disable_ctx() to refactor the error unwinding of rdt_enable_ctx() to simplify future additions. This also simplifies cleanup in rdt_kill_sb(). Remove cdp_disable_all() as it is not used anymore after the refactor. Suggested-by: Reinette Chatre <reinette.chatre@xxxxxxxxx> Signed-off-by: Babu Moger <babu.moger@xxxxxxx> --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 58 ++++++++++++++++---------- 1 file changed, 37 insertions(+), 21 deletions(-) diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c index 3010e3a1394d..80a4f76bc34b 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -2290,14 +2290,6 @@ int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable) return 0; } -static void cdp_disable_all(void) -{ - if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3)) - resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false); - if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2)) - resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false); -} - /* * We don't allow rdtgroup directories to be created anywhere * except the root directory. Thus when looking for the rdtgroup @@ -2377,19 +2369,47 @@ static int mkdir_mondata_all(struct kernfs_node *parent_kn, struct rdtgroup *prgrp, struct kernfs_node **mon_data_kn); +static void rdt_disable_ctx(void) +{ + if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3)) + resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false); + + if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2)) + resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false); + + if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl)) + set_mba_sc(false); +} + static int rdt_enable_ctx(struct rdt_fs_context *ctx) { int ret = 0; - if (ctx->enable_cdpl2) + if (ctx->enable_cdpl2) { ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, true); + if (ret) + goto out_done; + } - if (!ret && ctx->enable_cdpl3) + if (ctx->enable_cdpl3) { ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, true); + if (ret) + goto out_cdpl2; + } - if (!ret && ctx->enable_mba_mbps) + if (ctx->enable_mba_mbps) { ret = set_mba_sc(true); + if (ret) + goto out_cdpl3; + } + + return 0; +out_cdpl3: + resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false); +out_cdpl2: + resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false); +out_done: return ret; } @@ -2497,13 +2517,13 @@ static int rdt_get_tree(struct fs_context *fc) } ret = rdt_enable_ctx(ctx); - if (ret < 0) - goto out_cdp; + if (ret) + goto out; ret = schemata_list_create(); if (ret) { schemata_list_destroy(); - goto out_mba; + goto out_ctx; } closid_init(); @@ -2562,11 +2582,8 @@ static int rdt_get_tree(struct fs_context *fc) kernfs_remove(kn_info); out_schemata_free: schemata_list_destroy(); -out_mba: - if (ctx->enable_mba_mbps) - set_mba_sc(false); -out_cdp: - cdp_disable_all(); +out_ctx: + rdt_disable_ctx(); out: rdt_last_cmd_clear(); mutex_unlock(&rdtgroup_mutex); @@ -2798,12 +2815,11 @@ static void rdt_kill_sb(struct super_block *sb) cpus_read_lock(); mutex_lock(&rdtgroup_mutex); - set_mba_sc(false); + rdt_disable_ctx(); /*Put everything back to default values. */ for_each_alloc_capable_rdt_resource(r) reset_all_ctrls(r); - cdp_disable_all(); rmdir_all_sub(); rdt_pseudo_lock_release(); rdtgroup_default.mode = RDT_MODE_SHAREABLE; -- 2.34.1