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Date: Tue, 19 Oct 2021 18:18:08 -0500 From: Babu Moger <babu.moger@....com> To: James Morse <james.morse@....com>, x86@...nel.org, linux-kernel@...r.kernel.org Cc: Fenghua Yu <fenghua.yu@...el.com>, Reinette Chatre <reinette.chatre@...el.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, H Peter Anvin <hpa@...or.com>, shameerali.kolothum.thodi@...wei.com, Jamie Iles <jamie@...iainc.com>, D Scott Phillips OS <scott@...amperecomputing.com>, lcherian@...vell.com, bobo.shaobowang@...wei.com, tan.shaopeng@...itsu.com Subject: Re: [PATCH v2 04/23] x86/resctrl: Merge mon_capable and mon_enabled Hi James, On 10/1/21 11:02 AM, James Morse wrote: > mon_enabled and mon_capable are always set as a pair by > rdt_get_mon_l3_config(). > > There is no point having two values. > > Merge them together. > > Signed-off-by: James Morse <james.morse@....com> > --- > Changes since v1: > * Removed stray cdp_capable changes. > --- > arch/x86/kernel/cpu/resctrl/internal.h | 4 ---- > arch/x86/kernel/cpu/resctrl/monitor.c | 1 - > arch/x86/kernel/cpu/resctrl/rdtgroup.c | 8 ++++---- > include/linux/resctrl.h | 2 -- > 4 files changed, 4 insertions(+), 11 deletions(-) > > diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h > index 53f3d275a98f..8828b5c1b6d2 100644 > --- a/arch/x86/kernel/cpu/resctrl/internal.h > +++ b/arch/x86/kernel/cpu/resctrl/internal.h > @@ -459,10 +459,6 @@ int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable); > for_each_rdt_resource(r) \ > if (r->mon_capable) > > -#define for_each_mon_enabled_rdt_resource(r) \ > - for_each_rdt_resource(r) \ > - if (r->mon_enabled) > - > /* CPUID.(EAX=10H, ECX=ResID=1).EAX */ > union cpuid_0x10_1_eax { > struct { > diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c > index c9f0f3d63f75..37af1790337f 100644 > --- a/arch/x86/kernel/cpu/resctrl/monitor.c > +++ b/arch/x86/kernel/cpu/resctrl/monitor.c > @@ -717,7 +717,6 @@ int rdt_get_mon_l3_config(struct rdt_resource *r) > l3_mon_evt_init(r); > > r->mon_capable = true; > - r->mon_enabled = true; > > return 0; > } > diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c > index e327f8d1c8a3..e243c7d15b81 100644 > --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c > +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c > @@ -1765,7 +1765,7 @@ static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn) > goto out_destroy; > } > > - for_each_mon_enabled_rdt_resource(r) { > + for_each_mon_capable_rdt_resource(r) { > fflags = r->fflags | RF_MON_INFO; > sprintf(name, "%s_MON", r->name); > ret = rdtgroup_mkdir_info_resdir(r, name, fflags); > @@ -2504,7 +2504,7 @@ void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r, unsigned int dom_id) > struct rdtgroup *prgrp, *crgrp; > char name[32]; > > - if (!r->mon_enabled) > + if (!r->mon_capable) > return; > > list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) { > @@ -2572,7 +2572,7 @@ void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r, > struct rdtgroup *prgrp, *crgrp; > struct list_head *head; > > - if (!r->mon_enabled) > + if (!r->mon_capable) > return; > > list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) { > @@ -2642,7 +2642,7 @@ static int mkdir_mondata_all(struct kernfs_node *parent_kn, > * Create the subdirectories for each domain. Note that all events > * in a domain like L3 are grouped into a resource whose domain is L3 > */ > - for_each_mon_enabled_rdt_resource(r) { > + for_each_mon_capable_rdt_resource(r) { > ret = mkdir_mondata_subdir_alldom(kn, r, prgrp); > if (ret) > goto out_destroy; > diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h > index 386ab3a41500..8180c539800d 100644 > --- a/include/linux/resctrl.h > +++ b/include/linux/resctrl.h > @@ -130,7 +130,6 @@ struct resctrl_schema; > /** > * struct rdt_resource - attributes of a resctrl resource > * @rid: The index of the resource > - * @mon_enabled: Is monitoring enabled for this feature > * @alloc_capable: Is allocation available on this machine > * @mon_capable: Is monitor feature available on this machine > * @num_rmid: Number of RMIDs available > @@ -149,7 +148,6 @@ struct resctrl_schema; > */ > struct rdt_resource { > int rid; > - bool mon_enabled; > bool alloc_capable; > bool mon_capable; Also we should probably rename alloc_capable and mon_capable to alloc_supported and mon_supported respectively. We dont have an option to enable and disable these feature. If it is supported, it is always supported. Thanks Babu
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