The io_alloc feature in resctrl enables system software to configure
the portion of the L3 cache allocated for I/O traffic.
Add the interface to display CBMs (Capacity Bit Mask) of io_alloc
feature.
When CDP is enabled, io_alloc routes traffic using the highest CLOSID
which corresponds to CDP_CODE. Add a check for the CDP resource type.
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
v3: Minor changes due to changes in resctrl_arch_get_io_alloc_enabled()
and resctrl_io_alloc_closid_get().
Added the check to verify CDP resource type.
Updated the commit log.
v2: Fixed to display only on L3 resources.
Added the locks while processing.
Rename the displat to io_alloc_cbm (from sdciae_cmd).
---
arch/x86/kernel/cpu/resctrl/core.c | 2 ++
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 2 +-
arch/x86/kernel/cpu/resctrl/internal.h | 1 +
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 38 +++++++++++++++++++++++
4 files changed, 42 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 88bc95c14ea8..030f738dea8d 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -311,6 +311,8 @@ static void rdt_set_io_alloc_capable(struct rdt_resource *r)
r->cache.io_alloc_capable = true;
resctrl_file_fflags_init("io_alloc",
RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE);
+ resctrl_file_fflags_init("io_alloc_cbm",
+ RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE);
}
static void rdt_get_cdp_l3_config(void)
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 536351159cc2..d272dea43924 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -444,7 +444,7 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
return hw_dom->ctrl_val[idx];
}
-static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
+void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
{
struct rdt_resource *r = schema->res;
struct rdt_ctrl_domain *dom;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 61bc609e932b..07cf8409174d 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -668,4 +668,5 @@ void resctrl_file_fflags_init(const char *config, unsigned long fflags);
void rdt_staged_configs_clear(void);
bool closid_allocated(unsigned int closid);
int resctrl_find_cleanest_closid(void);
+void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid);
#endif /* _ASM_X86_RESCTRL_INTERNAL_H */
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 37295dd14abe..81b9d8c5dabf 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1967,6 +1967,38 @@ static ssize_t resctrl_io_alloc_write(struct kernfs_open_file *of, char *buf,
return ret ?: nbytes;
}
+static int resctrl_io_alloc_cbm_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct resctrl_schema *s = of->kn->parent->priv;
+ struct rdt_resource *r = s->res;
+ u32 io_alloc_closid;
+ int ret = 0;
+
+ if (!r->cache.io_alloc_capable || s->conf_type == CDP_DATA) {
+ rdt_last_cmd_puts("io_alloc feature is not supported on the resource\n");
+ return -EINVAL;
+ }
+
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+
+ if (!resctrl_arch_get_io_alloc_enabled(r)) {
+ rdt_last_cmd_puts("io_alloc feature is not enabled\n");
+ ret = -EINVAL;
+ goto cbm_show_out;
+ }
+
+ io_alloc_closid = resctrl_io_alloc_closid_get(r, s);
+
+ show_doms(seq, s, io_alloc_closid);
+
+cbm_show_out:
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+ return ret;
+}
+
/* rdtgroup information files for one cache resource. */
static struct rftype res_common_files[] = {
{
@@ -2126,6 +2158,12 @@ static struct rftype res_common_files[] = {
.seq_show = resctrl_io_alloc_show,
.write = resctrl_io_alloc_write,
},
+ {
+ .name = "io_alloc_cbm",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = resctrl_io_alloc_cbm_show,
+ },
{
.name = "mba_MBps_event",
.mode = 0644,
--
2.34.1
