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x86/resctrl: Walk the resctrl schema list instead of an arch list

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When parsing a schema configuration value from user-space, resctrl walks
the architectures rdt_resources_all[] array to find a matching struct
rdt_resource.

Once the CDP resources are merged there will be one resource in use
by two schemata. Anything walking rdt_resources_all[] on behalf of a
user-space request should walk the list of struct resctrl_schema
instead.

Change the users of for_each_alloc_enabled_rdt_resource() to walk the
schema instead. Schemata were only created for alloc_enabled resources
so these two lists are currently equivalent.

schemata_list_create() and rdt_kill_sb() are ignored. The first
creates the schema list, and will eventually loop over the resource
indexes using an arch helper to retrieve the resource. rdt_kill_sb()
will eventually make use of an arch 'reset everything' helper.

After the filesystem code is moved, rdtgroup_pseudo_locked_in_hierarchy()
remains part of the x86 specific hooks to support pseudo lock. This
code walks each domain, and still does this after the separate resources
are merged.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lkml.kernel.org/r/20210728170637.25610-7-james.morse@arm.com
This commit is contained in:
James Morse 2021-07-28 17:06:19 +00:00 committed by Borislav Petkov
parent 208ab16847
commit 331ebe4c43
2 changed files with 27 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
arch/x86/kernel/cpu/resctrl/ctrlmondata.c
View File

@ -287,10 +287,12 @@ static int rdtgroup_parse_resource(char *resname, char *tok,
struct rdtgroup *rdtgrp)
{
struct rdt_hw_resource *hw_res;
struct resctrl_schema *s;
struct rdt_resource *r;
for_each_alloc_enabled_rdt_resource(r) {
hw_res = resctrl_to_arch_res(r);
list_for_each_entry(s, &resctrl_schema_all, list) {
r = s->res;
hw_res = resctrl_to_arch_res(s->res);
if (!strcmp(resname, r->name) && rdtgrp->closid < hw_res->num_closid)
return parse_line(tok, r, rdtgrp);
}
@ -301,6 +303,7 @@ static int rdtgroup_parse_resource(char *resname, char *tok,
ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
struct resctrl_schema *s;
struct rdtgroup *rdtgrp;
struct rdt_domain *dom;
struct rdt_resource *r;
@ -331,8 +334,8 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
goto out;
}
for_each_alloc_enabled_rdt_resource(r) {
list_for_each_entry(dom, &r->domains, list)
list_for_each_entry(s, &resctrl_schema_all, list) {
list_for_each_entry(dom, &s->res->domains, list)
dom->have_new_ctrl = false;
}
@ -353,7 +356,8 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
goto out;
}
for_each_alloc_enabled_rdt_resource(r) {
list_for_each_entry(s, &resctrl_schema_all, list) {
r = s->res;
ret = update_domains(r, rdtgrp->closid);
if (ret)
goto out;
@ -401,6 +405,7 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
struct seq_file *s, void *v)
{
struct rdt_hw_resource *hw_res;
struct resctrl_schema *schema;
struct rdtgroup *rdtgrp;
struct rdt_resource *r;
int ret = 0;
@ -409,8 +414,10 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
rdtgrp = rdtgroup_kn_lock_live(of->kn);
if (rdtgrp) {
if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
for_each_alloc_enabled_rdt_resource(r)
list_for_each_entry(schema, &resctrl_schema_all, list) {
r = schema->res;
seq_printf(s, "%s:uninitialized\n", r->name);
}
} else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
if (!rdtgrp->plr->d) {
rdt_last_cmd_clear();
@ -424,8 +431,8 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
}
} else {
closid = rdtgrp->closid;
for_each_alloc_enabled_rdt_resource(r) {
hw_res = resctrl_to_arch_res(r);
list_for_each_entry(schema, &resctrl_schema_all, list) {
hw_res = resctrl_to_arch_res(schema->res);
if (closid < hw_res->num_closid)
show_doms(s, r, closid);
}

18
arch/x86/kernel/cpu/resctrl/rdtgroup.c
View File

@ -104,12 +104,12 @@ int closids_supported(void)
static void closid_init(void)
{
struct rdt_hw_resource *hw_res;
struct rdt_resource *r;
struct resctrl_schema *s;
int rdt_min_closid = 32;
/* Compute rdt_min_closid across all resources */
for_each_alloc_enabled_rdt_resource(r) {
hw_res = resctrl_to_arch_res(r);
list_for_each_entry(s, &resctrl_schema_all, list) {
hw_res = resctrl_to_arch_res(s->res);
rdt_min_closid = min(rdt_min_closid, hw_res->num_closid);
}
@ -1276,11 +1276,13 @@ static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
{
struct rdt_hw_domain *hw_dom;
int closid = rdtgrp->closid;
struct resctrl_schema *s;
struct rdt_resource *r;
bool has_cache = false;
struct rdt_domain *d;
for_each_alloc_enabled_rdt_resource(r) {
list_for_each_entry(s, &resctrl_schema_all, list) {
r = s->res;
if (r->rid == RDT_RESOURCE_MBA)
continue;
has_cache = true;
@ -1418,6 +1420,7 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
static int rdtgroup_size_show(struct kernfs_open_file *of,
struct seq_file *s, void *v)
{
struct resctrl_schema *schema;
struct rdt_hw_domain *hw_dom;
struct rdtgroup *rdtgrp;
struct rdt_resource *r;
@ -1449,7 +1452,8 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
goto out;
}
for_each_alloc_enabled_rdt_resource(r) {
list_for_each_entry(schema, &resctrl_schema_all, list) {
r = schema->res;
sep = false;
seq_printf(s, "%*s:", max_name_width, r->name);
list_for_each_entry(d, &r->domains, list) {
@ -2815,10 +2819,12 @@ static void rdtgroup_init_mba(struct rdt_resource *r)
/* Initialize the RDT group's allocations. */
static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
{
struct resctrl_schema *s;
struct rdt_resource *r;
int ret;
for_each_alloc_enabled_rdt_resource(r) {
list_for_each_entry(s, &resctrl_schema_all, list) {
r = s->res;
if (r->rid == RDT_RESOURCE_MBA) {
rdtgroup_init_mba(r);
} else {