Commit dfe9674b authored by Reinette Chatre's avatar Reinette Chatre Committed by Thomas Gleixner

x86/intel_rdt: Enable entering of pseudo-locksetup mode

The user can request entering pseudo-locksetup mode by writing
"pseudo-locksetup" to the mode file. Act on this request as well as
support switching from a pseudo-locksetup mode (before pseudo-locked
mode was entered). It is not supported to modify the mode once
pseudo-locked mode has been entered.

The schemata reflects the new mode by adding "uninitialized" to all
resources. The size resctrl file reports zero for all cache domains in
support of the uninitialized nature. Since there are no users of this
class of service its allocations can be ignored when searching for
appropriate default allocations for new resource groups. For the same
reason resource groups in pseudo-locksetup mode are not considered when
testing if new resource groups may overlap.
Signed-off-by: default avatarReinette Chatre <reinette.chatre@intel.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
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/56f553334708022903c296284e62db3bbc1ff150.1529706536.git.reinette.chatre@intel.com
parent 63657c1c
...@@ -156,7 +156,8 @@ int parse_cbm(void *_data, struct rdt_resource *r, struct rdt_domain *d) ...@@ -156,7 +156,8 @@ int parse_cbm(void *_data, struct rdt_resource *r, struct rdt_domain *d)
} }
if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, false)) { if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, false)) {
if (rdtgrp->mode == RDT_MODE_EXCLUSIVE) { if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
rdt_last_cmd_printf("overlaps with other group\n"); rdt_last_cmd_printf("overlaps with other group\n");
return -EINVAL; return -EINVAL;
} }
...@@ -356,10 +357,15 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of, ...@@ -356,10 +357,15 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
rdtgrp = rdtgroup_kn_lock_live(of->kn); rdtgrp = rdtgroup_kn_lock_live(of->kn);
if (rdtgrp) { if (rdtgrp) {
closid = rdtgrp->closid; if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
for_each_alloc_enabled_rdt_resource(r) { for_each_alloc_enabled_rdt_resource(r)
if (closid < r->num_closid) seq_printf(s, "%s:uninitialized\n", r->name);
show_doms(s, r, closid); } else {
closid = rdtgrp->closid;
for_each_alloc_enabled_rdt_resource(r) {
if (closid < r->num_closid)
show_doms(s, r, closid);
}
} }
} else { } else {
ret = -ENOENT; ret = -ENOENT;
......
...@@ -974,9 +974,10 @@ bool rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d, ...@@ -974,9 +974,10 @@ bool rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
ctrl = d->ctrl_val; ctrl = d->ctrl_val;
for (i = 0; i < r->num_closid; i++, ctrl++) { for (i = 0; i < r->num_closid; i++, ctrl++) {
ctrl_b = (unsigned long *)ctrl; ctrl_b = (unsigned long *)ctrl;
if (closid_allocated(i) && i != closid) { mode = rdtgroup_mode_by_closid(i);
if (closid_allocated(i) && i != closid &&
mode != RDT_MODE_PSEUDO_LOCKSETUP) {
if (bitmap_intersects(cbm, ctrl_b, r->cache.cbm_len)) { if (bitmap_intersects(cbm, ctrl_b, r->cache.cbm_len)) {
mode = rdtgroup_mode_by_closid(i);
if (exclusive) { if (exclusive) {
if (mode == RDT_MODE_EXCLUSIVE) if (mode == RDT_MODE_EXCLUSIVE)
return true; return true;
...@@ -1046,10 +1047,24 @@ static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of, ...@@ -1046,10 +1047,24 @@ static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
mode = rdtgrp->mode; mode = rdtgrp->mode;
if ((!strcmp(buf, "shareable") && mode == RDT_MODE_SHAREABLE) || if ((!strcmp(buf, "shareable") && mode == RDT_MODE_SHAREABLE) ||
(!strcmp(buf, "exclusive") && mode == RDT_MODE_EXCLUSIVE)) (!strcmp(buf, "exclusive") && mode == RDT_MODE_EXCLUSIVE) ||
(!strcmp(buf, "pseudo-locksetup") &&
mode == RDT_MODE_PSEUDO_LOCKSETUP) ||
(!strcmp(buf, "pseudo-locked") && mode == RDT_MODE_PSEUDO_LOCKED))
goto out; goto out;
if (mode == RDT_MODE_PSEUDO_LOCKED) {
rdt_last_cmd_printf("cannot change pseudo-locked group\n");
ret = -EINVAL;
goto out;
}
if (!strcmp(buf, "shareable")) { if (!strcmp(buf, "shareable")) {
if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
ret = rdtgroup_locksetup_exit(rdtgrp);
if (ret)
goto out;
}
rdtgrp->mode = RDT_MODE_SHAREABLE; rdtgrp->mode = RDT_MODE_SHAREABLE;
} else if (!strcmp(buf, "exclusive")) { } else if (!strcmp(buf, "exclusive")) {
if (!rdtgroup_mode_test_exclusive(rdtgrp)) { if (!rdtgroup_mode_test_exclusive(rdtgrp)) {
...@@ -1057,7 +1072,17 @@ static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of, ...@@ -1057,7 +1072,17 @@ static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
ret = -EINVAL; ret = -EINVAL;
goto out; goto out;
} }
if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
ret = rdtgroup_locksetup_exit(rdtgrp);
if (ret)
goto out;
}
rdtgrp->mode = RDT_MODE_EXCLUSIVE; rdtgrp->mode = RDT_MODE_EXCLUSIVE;
} else if (!strcmp(buf, "pseudo-locksetup")) {
ret = rdtgroup_locksetup_enter(rdtgrp);
if (ret)
goto out;
rdtgrp->mode = RDT_MODE_PSEUDO_LOCKSETUP;
} else { } else {
rdt_last_cmd_printf("unknown/unsupported mode\n"); rdt_last_cmd_printf("unknown/unsupported mode\n");
ret = -EINVAL; ret = -EINVAL;
...@@ -1127,8 +1152,12 @@ static int rdtgroup_size_show(struct kernfs_open_file *of, ...@@ -1127,8 +1152,12 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
list_for_each_entry(d, &r->domains, list) { list_for_each_entry(d, &r->domains, list) {
if (sep) if (sep)
seq_putc(s, ';'); seq_putc(s, ';');
cbm = d->ctrl_val[rdtgrp->closid]; if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
size = rdtgroup_cbm_to_size(r, d, cbm); size = 0;
} else {
cbm = d->ctrl_val[rdtgrp->closid];
size = rdtgroup_cbm_to_size(r, d, cbm);
}
seq_printf(s, "%d=%u", d->id, size); seq_printf(s, "%d=%u", d->id, size);
sep = true; sep = true;
} }
...@@ -2277,6 +2306,8 @@ static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp) ...@@ -2277,6 +2306,8 @@ static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
for (i = 0; i < r->num_closid; i++, ctrl++) { for (i = 0; i < r->num_closid; i++, ctrl++) {
if (closid_allocated(i) && i != closid) { if (closid_allocated(i) && i != closid) {
mode = rdtgroup_mode_by_closid(i); mode = rdtgroup_mode_by_closid(i);
if (mode == RDT_MODE_PSEUDO_LOCKSETUP)
break;
used_b |= *ctrl; used_b |= *ctrl;
if (mode == RDT_MODE_SHAREABLE) if (mode == RDT_MODE_SHAREABLE)
d->new_ctrl |= *ctrl; d->new_ctrl |= *ctrl;
......
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