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Message-Id: <0977cf20351cfbfc83d81c63425ac438700b00f4.1524649902.git.reinette.chatre@intel.com>
Date: Wed, 25 Apr 2018 03:10:06 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: tglx@...utronix.de, fenghua.yu@...el.com, tony.luck@...el.com,
vikas.shivappa@...ux.intel.com
Cc: gavin.hindman@...el.com, jithu.joseph@...el.com,
dave.hansen@...el.com, mingo@...hat.com, hpa@...or.com,
x86@...nel.org, linux-kernel@...r.kernel.org,
Reinette Chatre <reinette.chatre@...el.com>
Subject: [PATCH V3 30/39] x86/intel_rdt: Support creation/removal of pseudo-locked region
The user triggers the creation of a pseudo-locked region when writing a
valid schemata to the schemata file of a resource group in the
pseudo-locksetup mode.
A valid schemata is one that: (1) does not overlap with any other resource
group, (2) does not involve a cache that already contains a
pseudo-locked region within its hierarchy.
After a valid schemata is parsed the system is programmed to associate
the to be pseudo-lock bitmask with the closid associated with the
resource group. With the system set up the pseudo-locked region can be
created.
Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>
---
arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c | 42 +++++++++++++++++++++++++++++
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 25 +++++++++++++----
2 files changed, 62 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
index 0cc9f8a1f44c..7a57307f439c 100644
--- a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
+++ b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
@@ -142,9 +142,26 @@ int parse_cbm(void *_data, struct rdt_resource *r, struct rdt_domain *d)
return -EINVAL;
}
+ /*
+ * Cannot set up more than one pseudo-locked region in a cache
+ * hierarchy.
+ */
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
+ rdtgroup_pseudo_locked_in_hierarchy(d)) {
+ rdt_last_cmd_printf("pseudo-locked region in hierarchy\n");
+ return -EINVAL;
+ }
+
if (!cbm_validate(data->buf, &cbm_val, r))
return -EINVAL;
+ if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
+ rdtgrp->mode == RDT_MODE_SHAREABLE) &&
+ rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
+ rdt_last_cmd_printf("CBM overlaps with pseudo-locked region\n");
+ return -EINVAL;
+ }
+
/*
* The CBM may not overlap with the CBM of another closid if
* either is exclusive.
@@ -198,6 +215,21 @@ static int parse_line(char *line, struct rdt_resource *r,
data.rdtgrp = rdtgrp;
if (r->parse_ctrlval(&data, r, d))
return -EINVAL;
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ /*
+ * In pseudo-locking setup mode and just
+ * parsed a valid CBM that should be
+ * pseudo-locked. Only one locked region per
+ * resource group and domain so just do
+ * the required initialization for single
+ * region and return.
+ */
+ rdtgrp->plr->r = r;
+ rdtgrp->plr->d = d;
+ rdtgrp->plr->cbm = d->new_ctrl;
+ d->plr = rdtgrp->plr;
+ return 0;
+ }
goto next;
}
}
@@ -312,6 +344,16 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
goto out;
}
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ /*
+ * If pseudo-locking fails we keep the resource group in
+ * mode RDT_MODE_PSEUDO_LOCKSETUP with its class of service
+ * active and updated for just the domain the pseudo-locked
+ * region was requested for.
+ */
+ ret = rdtgroup_pseudo_lock_create(rdtgrp);
+ }
+
out:
rdtgroup_kn_unlock(of->kn);
return ret ?: nbytes;
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index e911aa58e316..677645a231ae 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -1739,6 +1739,9 @@ void rdtgroup_kn_unlock(struct kernfs_node *kn)
if (atomic_dec_and_test(&rdtgrp->waitcount) &&
(rdtgrp->flags & RDT_DELETED)) {
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+ rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
+ rdtgroup_pseudo_lock_remove(rdtgrp);
kernfs_unbreak_active_protection(kn);
kernfs_put(rdtgrp->kn);
kfree(rdtgrp);
@@ -1962,6 +1965,10 @@ static void rmdir_all_sub(void)
if (rdtgrp == &rdtgroup_default)
continue;
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+ rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
+ rdtgroup_pseudo_lock_remove(rdtgrp);
+
/*
* Give any CPUs back to the default group. We cannot copy
* cpu_online_mask because a CPU might have executed the
@@ -2232,6 +2239,8 @@ static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
d->new_ctrl |= *ctrl;
}
}
+ if (d->plr && d->plr->cbm > 0)
+ used_b |= d->plr->cbm;
unused_b = used_b ^ (BIT_MASK(r->cache.cbm_len) - 1);
unused_b &= BIT_MASK(r->cache.cbm_len) - 1;
d->new_ctrl |= unused_b;
@@ -2607,13 +2616,19 @@ static int rdtgroup_rmdir(struct kernfs_node *kn)
* If the rdtgroup is a mon group and parent directory
* is a valid "mon_groups" directory, remove the mon group.
*/
- if (rdtgrp->type == RDTCTRL_GROUP && parent_kn == rdtgroup_default.kn)
- ret = rdtgroup_rmdir_ctrl(kn, rdtgrp, tmpmask);
- else if (rdtgrp->type == RDTMON_GROUP &&
- is_mon_groups(parent_kn, kn->name))
+ if (rdtgrp->type == RDTCTRL_GROUP && parent_kn == rdtgroup_default.kn) {
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+ rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+ ret = rdtgroup_ctrl_remove(kn, rdtgrp);
+ } else {
+ ret = rdtgroup_rmdir_ctrl(kn, rdtgrp, tmpmask);
+ }
+ } else if (rdtgrp->type == RDTMON_GROUP &&
+ is_mon_groups(parent_kn, kn->name)) {
ret = rdtgroup_rmdir_mon(kn, rdtgrp, tmpmask);
- else
+ } else {
ret = -EPERM;
+ }
out:
rdtgroup_kn_unlock(kn);
--
2.13.6
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