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

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

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 08eef53..405b99d 100644 (file)
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -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);
                        }

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index d7fd071..7502b7d 100644 (file)
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -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 {