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Groups > linux.kernel > #1478829
| From | "Fenghua Yu" <fenghua.yu@intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v2 28/33] x86/intel_rdt_rdtgroup.c: Read and write cpus |
| Date | 2016-09-08 09:10 +0200 |
| Message-ID | <sf1Db-2F3-3@gated-at.bofh.it> (permalink) |
| References | <sf1tv-2mB-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Fenghua Yu <fenghua.yu@intel.com>
Normally each task is associated with one rdtgroup and we use the schema
for that rdtgroup whenever the task is running. The user can designate
some cpus to always use the same schema, regardless of which task is
running. To do that the user write a cpumask bit string to the "cpus"
file.
A cpu can only be listed in one rdtgroup. If the user specifies a cpu
that is currently assigned to a different rdtgroup, it is removed
from that rdtgroup.
See Documentation/x86/intel_rdt_ui.txt
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
---
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 92 ++++++++++++++++++++++++++++++++
1 file changed, 92 insertions(+)
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index 71231ba..6c3161a 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -59,6 +59,10 @@ static struct dentry *rdt_mount(struct file_system_type *fs_type,
void *data);
static void rdt_kill_sb(struct super_block *sb);
+static int rdtgroup_cpus_show(struct seq_file *s, void *v);
+static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off);
+
/* rdtgroup core interface files */
static struct rftype rdtgroup_root_base_files[] = {
{
@@ -1189,3 +1193,91 @@ static void rdt_kill_sb(struct super_block *sb)
mutex_unlock(&rdtgroup_mutex);
}
+
+static int rdtgroup_cpus_show(struct seq_file *s, void *v)
+{
+ struct kernfs_open_file *of = s->private;
+ struct rdtgroup *rdtgrp;
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (!rdtgrp)
+ return -ENODEV;
+
+ seq_printf(s, "%*pb\n", cpumask_pr_args(&rdtgrp->cpu_mask));
+ rdtgroup_kn_unlock(of->kn);
+
+ return 0;
+}
+
+static int cpus_validate(struct cpumask *cpumask, struct rdtgroup *rdtgrp)
+{
+ int old_cpumask_bit, new_cpumask_bit;
+ int cpu;
+
+ for_each_online_cpu(cpu) {
+ old_cpumask_bit = cpumask_test_cpu(cpu, &rdtgrp->cpu_mask);
+ new_cpumask_bit = cpumask_test_cpu(cpu, cpumask);
+ /* Cannot clear a "cpus" bit in a rdtgroup. */
+ if (old_cpumask_bit == 1 && new_cpumask_bit == 0)
+ return -EINVAL;
+ }
+
+ /* If a cpu is not online, cannot set it. */
+ for_each_cpu(cpu, cpumask) {
+ if (!cpu_online(cpu))
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
+{
+ struct rdtgroup *rdtgrp;
+ unsigned long bitmap[BITS_TO_LONGS(NR_CPUS)];
+ struct cpumask *cpumask;
+ int cpu;
+ struct list_head *l;
+ struct rdtgroup *r;
+ int ret = 0;
+
+ if (!buf)
+ return -EINVAL;
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (!rdtgrp)
+ return -ENODEV;
+
+ if (list_empty(&rdtgroup_lists)) {
+ ret = -EINVAL;
+ goto end;
+ }
+
+ ret = __bitmap_parse(buf, strlen(buf), 0, bitmap, nr_cpu_ids);
+ if (ret)
+ goto end;
+
+ cpumask = to_cpumask(bitmap);
+ ret = cpus_validate(cpumask, rdtgrp);
+ if (ret)
+ goto end;
+
+ list_for_each(l, &rdtgroup_lists) {
+ r = list_entry(l, struct rdtgroup, rdtgroup_list);
+ if (r == rdtgrp)
+ continue;
+
+ for_each_cpu_and(cpu, &r->cpu_mask, cpumask)
+ cpumask_clear_cpu(cpu, &r->cpu_mask);
+ }
+
+ cpumask_copy(&rdtgrp->cpu_mask, cpumask);
+ for_each_cpu(cpu, cpumask)
+ per_cpu(cpu_rdtgroup, cpu) = rdtgrp;
+
+end:
+ rdtgroup_kn_unlock(of->kn);
+
+ return ret ?: nbytes;
+}
--
2.5.0
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[PATCH v2 00/33] Enable Intel Resource Allocation in Resource Director Technology "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:00 +0200
[PATCH v2 32/33] MAINTAINERS: Add maintainer for Intel RDT resource allocation "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:00 +0200
[PATCH v2 30/33] x86/intel_rdt_rdtgroup.c: Process schemata input from resctrl interface "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:00 +0200
Re: [PATCH v2 30/33] x86/intel_rdt_rdtgroup.c: Process schemata input from resctrl interface Thomas Gleixner <tglx@linutronix.de> - 2016-09-09 00:30 +0200
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Re: [PATCH v2 31/33] Documentation/kernel-parameters: Add kernel parameter "resctrl" for CAT Thomas Gleixner <tglx@linutronix.de> - 2016-09-09 00:30 +0200
[PATCH v2 28/33] x86/intel_rdt_rdtgroup.c: Read and write cpus "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
Re: [PATCH v2 28/33] x86/intel_rdt_rdtgroup.c: Read and write cpus Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 22:30 +0200
[PATCH v2 24/33] x86/intel_rdt_rdtgroup.c: Create info directory "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
Re: [PATCH v2 24/33] x86/intel_rdt_rdtgroup.c: Create info directory Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 18:10 +0200
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Re: [PATCH v2 11/33] x86/intel_rdt: Hot cpu support for Cache Allocation Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 12:10 +0200
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Re: [PATCH v2 13/33] Define CONFIG_INTEL_RDT Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 12:20 +0200
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Re: [PATCH v2 08/33] x86/intel_rdt: Add Class of service management Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 11:00 +0200
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Re: [PATCH v2 20/33] x86/intel_rdt.h: Header for inter_rdt.c Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 14:40 +0200
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Re: [PATCH v2 25/33] include/linux/resctrl.h: Define fork and exit functions in a new header file Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 18:20 +0200
[PATCH v2 27/33] x86/intel_rdt_rdtgroup.c: Implement resctrl file system commands "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
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Re: [PATCH v2 09/33] x86/intel_rdt: Add L3 cache capacity bitmask management Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 11:50 +0200
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Re: [PATCH v2 07/33] x86/intel_rdt: Add support for Cache Allocation detection Borislav Petkov <bp@suse.de> - 2016-09-08 14:00 +0200
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Re: [PATCH v2 07/33] x86/intel_rdt: Add support for Cache Allocation detection Borislav Petkov <bp@suse.de> - 2016-09-08 19:20 +0200
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[PATCH v2 05/33] x86/intel_rdt: Cache Allocation documentation "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
[PATCH v2 19/33] magic number for resctrl file system "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
Re: [PATCH v2 19/33] magic number for resctrl file system Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 12:50 +0200
Re: [PATCH v2 19/33] magic number for resctrl file system Borislav Petkov <bp@alien8.de> - 2016-09-08 12:50 +0200
[PATCH v2 21/33] x86/intel_rdt_rdtgroup.h: Header for user interface "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
Re: [PATCH v2 21/33] x86/intel_rdt_rdtgroup.h: Header for user interface Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 14:50 +0200
[PATCH v2 26/33] Task fork and exit for rdtgroup "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
Re: [PATCH v2 26/33] Task fork and exit for rdtgroup Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 21:50 +0200
[PATCH v2 18/33] sched.h: Add rg_list and rdtgroup in task_struct "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
Re: [PATCH v2 18/33] sched.h: Add rg_list and rdtgroup in task_struct Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 12:40 +0200
[PATCH v2 02/33] Documentation, ABI: Add a document entry for cache id "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
Re: [PATCH v2 02/33] Documentation, ABI: Add a document entry for cache id Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 21:40 +0200
[PATCH v2 12/33] x86/intel_rdt: Intel haswell Cache Allocation enumeration "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
Re: [PATCH v2 12/33] x86/intel_rdt: Intel haswell Cache Allocation enumeration Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 12:20 +0200
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