From: Babu Moger babu.moger@amd.com
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().
Suggested-by: Reinette Chatre reinette.chatre@intel.com Signed-off-by: Babu Moger babu.moger@amd.com Signed-off-by: Borislav Petkov (AMD) bp@alien8.de Reviewed-by: Peter Newman peternewman@google.com Reviewed-by: Tan Shaopeng tan.shaopeng@jp.fujitsu.com Reviewed-by: Fenghua Yu fenghua.yu@intel.com Reviewed-by: Reinette Chatre reinette.chatre@intel.com Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Tested-by: Peter Newman peternewman@google.com Tested-by: Tan Shaopeng tan.shaopeng@jp.fujitsu.com Link: https://lore.kernel.org/r/20231017002308.134480-5-babu.moger@amd.com --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 53 ++++++++++++++++---------- 1 file changed, 32 insertions(+), 21 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c index 125d12d8f4b9..d1b5fd70ccbb 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -2308,14 +2308,6 @@ 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 @@ -2395,19 +2387,42 @@ 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) +{ + resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false); + resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false); + 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; }
@@ -2515,13 +2530,13 @@ 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(); @@ -2580,11 +2595,8 @@ 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); @@ -2816,12 +2828,11 @@ 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;