diff options
| author | Tony Luck <tony.luck@intel.com> | 2016-10-28 15:04:45 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-10-30 19:10:15 -0600 |
| commit | 12e0110c11a460b890ed7e1071198ced732152c9 (patch) | |
| tree | 196748e39fb977b69aaeabeef260fb7cae85a4f3 /arch/x86/kernel/cpu/intel_rdt.c | |
| parent | 60cf5e101fd4441ab112a81e88726efb6fd7542c (diff) | |
x86/intel_rdt: Add cpus file
Now we populate each directory with a read/write (mode 0644) file
named "cpus". This is used to over-ride the resources available
to processes in the default resource group when running on specific
CPUs. Each "cpus" file reads as a cpumask showing which CPUs belong
to this resource group. Initially all online CPUs are assigned to
the default group. They can be added to other groups by writing a
cpumask to the "cpus" file in the directory for the resource group
(which will remove them from the previous group to which they were
assigned). CPU online/offline operations will delete CPUs that go
offline from whatever group they are in and add new CPUs to the
default group.
If there are CPUs assigned to a group when the directory is removed,
they are returned to the default group.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Cc: "Ravi V Shankar" <ravi.v.shankar@intel.com>
Cc: "Shaohua Li" <shli@fb.com>
Cc: "Sai Prakhya" <sai.praneeth.prakhya@intel.com>
Cc: "Peter Zijlstra" <peterz@infradead.org>
Cc: "Stephane Eranian" <eranian@google.com>
Cc: "Dave Hansen" <dave.hansen@intel.com>
Cc: "David Carrillo-Cisneros" <davidcc@google.com>
Cc: "Nilay Vaish" <nilayvaish@gmail.com>
Cc: "Vikas Shivappa" <vikas.shivappa@linux.intel.com>
Cc: "Ingo Molnar" <mingo@elte.hu>
Cc: "Borislav Petkov" <bp@suse.de>
Cc: "H. Peter Anvin" <h.peter.anvin@intel.com>
Link: http://lkml.kernel.org/r/1477692289-37412-7-git-send-email-fenghua.yu@intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/cpu/intel_rdt.c')
| -rw-r--r-- | arch/x86/kernel/cpu/intel_rdt.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c index 9d95414f7117..40094aed5f71 100644 --- a/arch/x86/kernel/cpu/intel_rdt.c +++ b/arch/x86/kernel/cpu/intel_rdt.c @@ -36,6 +36,8 @@ /* Mutex to protect rdtgroup access. */ DEFINE_MUTEX(rdtgroup_mutex); +DEFINE_PER_CPU_READ_MOSTLY(int, cpu_closid); + #define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].domains) struct rdt_resource rdt_resources_all[] = { @@ -331,16 +333,25 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r) } } -static int intel_rdt_online_cpu(unsigned int cpu) +static void clear_closid(int cpu) { struct intel_pqr_state *state = this_cpu_ptr(&pqr_state); + + per_cpu(cpu_closid, cpu) = 0; + state->closid = 0; + wrmsr(MSR_IA32_PQR_ASSOC, state->rmid, 0); +} + +static int intel_rdt_online_cpu(unsigned int cpu) +{ struct rdt_resource *r; mutex_lock(&rdtgroup_mutex); for_each_capable_rdt_resource(r) domain_add_cpu(cpu, r); - state->closid = 0; - wrmsr(MSR_IA32_PQR_ASSOC, state->rmid, 0); + /* The cpu is set in default rdtgroup after online. */ + cpumask_set_cpu(cpu, &rdtgroup_default.cpu_mask); + clear_closid(cpu); mutex_unlock(&rdtgroup_mutex); return 0; @@ -348,11 +359,17 @@ static int intel_rdt_online_cpu(unsigned int cpu) static int intel_rdt_offline_cpu(unsigned int cpu) { + struct rdtgroup *rdtgrp; struct rdt_resource *r; mutex_lock(&rdtgroup_mutex); for_each_capable_rdt_resource(r) domain_remove_cpu(cpu, r); + list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) { + if (cpumask_test_and_clear_cpu(cpu, &rdtgrp->cpu_mask)) + break; + } + clear_closid(cpu); mutex_unlock(&rdtgroup_mutex); return 0; |