From 472ef09b40c5802a2e014ae2503ad8619486f9e6 Mon Sep 17 00:00:00 2001 From: Reinette Chatre Date: Fri, 22 Jun 2018 15:41:55 -0700 Subject: [PATCH] x86/intel_rdt: Associate mode with each RDT resource group Each RDT resource group is associated with a mode that will reflect the level of sharing of its allocations. The default, shareable, will be associated with each resource group on creation since it is zero and resource groups are created with kzalloc. The managing of the mode of a resource group will follow. The default resource group always remain though so ensure that it is reset to the default mode when the resctrl filesystem is unmounted. Also introduce a utility that can be used to determine the mode of a resource group when it is searched for based on its class of service. Signed-off-by: Reinette Chatre Signed-off-by: Thomas Gleixner Cc: fenghua.yu@intel.com Cc: tony.luck@intel.com Cc: vikas.shivappa@linux.intel.com Cc: gavin.hindman@intel.com Cc: jithu.joseph@intel.com Cc: dave.hansen@intel.com Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/797e4e1de4e4fcdf5b5e0039354d6a28079e2015.1529706536.git.reinette.chatre@intel.com --- arch/x86/kernel/cpu/intel_rdt.h | 3 +++ arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 22 ++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h index fef254e85da4..482dd6d3b8c5 100644 --- a/arch/x86/kernel/cpu/intel_rdt.h +++ b/arch/x86/kernel/cpu/intel_rdt.h @@ -122,6 +122,7 @@ struct mongroup { * @type: indicates type of this rdtgroup - either * monitor only or ctrl_mon group * @mon: mongroup related data + * @mode: mode of resource group */ struct rdtgroup { struct kernfs_node *kn; @@ -132,6 +133,7 @@ struct rdtgroup { atomic_t waitcount; enum rdt_group_type type; struct mongroup mon; + enum rdtgrp_mode mode; }; /* rdtgroup.flags */ @@ -461,6 +463,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of, char *buf, size_t nbytes, loff_t off); int rdtgroup_schemata_show(struct kernfs_open_file *of, struct seq_file *s, void *v); +enum rdtgrp_mode rdtgroup_mode_by_closid(int closid); struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r); int alloc_rmid(void); void free_rmid(u32 rmid); diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c index fa668f967062..4a72061df7cd 100644 --- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c +++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c @@ -126,6 +126,27 @@ static void closid_free(int closid) closid_free_map |= 1 << closid; } +/** + * rdtgroup_mode_by_closid - Return mode of resource group with closid + * @closid: closid if the resource group + * + * Each resource group is associated with a @closid. Here the mode + * of a resource group can be queried by searching for it using its closid. + * + * Return: mode as &enum rdtgrp_mode of resource group with closid @closid + */ +enum rdtgrp_mode rdtgroup_mode_by_closid(int closid) +{ + struct rdtgroup *rdtgrp; + + list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) { + if (rdtgrp->closid == closid) + return rdtgrp->mode; + } + + return RDT_NUM_MODES; +} + /* set uid and gid of rdtgroup dirs and files to that of the creator */ static int rdtgroup_kn_set_ugid(struct kernfs_node *kn) { @@ -1491,6 +1512,7 @@ static void rdt_kill_sb(struct super_block *sb) reset_all_ctrls(r); cdp_disable_all(); rmdir_all_sub(); + rdtgroup_default.mode = RDT_MODE_SHAREABLE; static_branch_disable_cpuslocked(&rdt_alloc_enable_key); static_branch_disable_cpuslocked(&rdt_mon_enable_key); static_branch_disable_cpuslocked(&rdt_enable_key); -- 2.30.2