github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-12 16:18:45 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

arm_mpam: resctrl: Implement helpers to update configuration

Browse Source 
resctrl has two helpers for updating the configuration.
resctrl_arch_update_one() updates a single value, and is used by the
software-controller to apply feedback to the bandwidth controls, it has to
be called on one of the CPUs in the resctrl:domain.

resctrl_arch_update_domains() copies multiple staged configurations, it can
be called from anywhere.

Both helpers should update any changes to the underlying hardware.

Implement resctrl_arch_update_domains() to use
resctrl_arch_update_one(). Neither need to be called on a specific CPU as
the mpam driver will send IPIs as needed.

Tested-by: Gavin Shan <gshan@redhat.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Zeng Heng <zengheng4@huawei.com>
Tested-by: Punit Agrawal <punit.agrawal@oss.qualcomm.com>
Tested-by: Jesse Chick <jessechick@os.amperecomputing.com>
Reviewed-by: Zeng Heng <zengheng4@huawei.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Co-developed-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
This commit is contained in:
James Morse 2026-03-13 14:45:55 +00:00
parent 02cc661687
commit 9cd2b522be
1 changed files with 70 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
drivers/resctrl/mpam_resctrl.c
View File

@ -213,6 +213,76 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
}
}
int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_ctrl_domain *d,
u32 closid, enum resctrl_conf_type t, u32 cfg_val)
{
u32 partid;
struct mpam_config cfg;
struct mpam_props *cprops;
struct mpam_resctrl_res *res;
struct mpam_resctrl_dom *dom;
lockdep_assert_cpus_held();
lockdep_assert_irqs_enabled();
/*
* No need to check the CPU as mpam_apply_config() doesn't care, and
* resctrl_arch_update_domains() relies on this.
*/
res = container_of(r, struct mpam_resctrl_res, resctrl_res);
dom = container_of(d, struct mpam_resctrl_dom, resctrl_ctrl_dom);
cprops = &res->class->props;
partid = resctrl_get_config_index(closid, t);
if (!r->alloc_capable || partid >= resctrl_arch_get_num_closid(r)) {
pr_debug("Not alloc capable or computed PARTID out of range\n");
return -EINVAL;
}
/*
* Copy the current config to avoid clearing other resources when the
* same component is exposed multiple times through resctrl.
*/
cfg = dom->ctrl_comp->cfg[partid];
switch (r->rid) {
case RDT_RESOURCE_L2:
case RDT_RESOURCE_L3:
cfg.cpbm = cfg_val;
mpam_set_feature(mpam_feat_cpor_part, &cfg);
break;
default:
return -EINVAL;
}
return mpam_apply_config(dom->ctrl_comp, partid, &cfg);
}
int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
{
int err;
struct rdt_ctrl_domain *d;
lockdep_assert_cpus_held();
lockdep_assert_irqs_enabled();
list_for_each_entry_rcu(d, &r->ctrl_domains, hdr.list) {
for (enum resctrl_conf_type t = 0; t < CDP_NUM_TYPES; t++) {
struct resctrl_staged_config *cfg = &d->staged_config[t];
if (!cfg->have_new_ctrl)
continue;
err = resctrl_arch_update_one(r, d, closid, t,
cfg->new_ctrl);
if (err)
return err;
}
}
return 0;
}
void resctrl_arch_reset_all_ctrls(struct rdt_resource *r)
{
struct mpam_resctrl_res *res;