diff options
| author | Babu Moger <babu.moger@amd.com> | 2025-11-12 18:57:31 -0600 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-11-21 22:49:42 +0100 |
| commit | 48068e565045ee0c77fdb34225ac6dedb5871fc2 (patch) | |
| tree | 2850d9ad679b7e6642dd1fe61c33ac30c82f742d /fs/resctrl/ctrlmondata.c | |
| parent | 556d2892aa715286d840a74216c8fff885559261 (diff) | |
fs/resctrl: Introduce interface to display "io_alloc" support
Introduce the "io_alloc" resctrl file to the "info" area of a cache resource,
for example /sys/fs/resctrl/info/L3/io_alloc. "io_alloc" indicates support for
the "io_alloc" feature that allows direct insertion of data from I/O
devices into the cache.
Restrict exposing support for "io_alloc" to the L3 resource that is the only
resource where this feature can be backed by AMD's L3 Smart Data Cache
Injection Allocation Enforcement (SDCIAE). With that, the "io_alloc" file is
only visible to user space if the L3 resource supports "io_alloc".
Doing so makes the file visible for all cache resources though, for example
also L2 cache (if it supports cache allocation). As a consequence, add
capability for file to report expected "enabled" and "disabled", as well as
"not supported".
Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://patch.msgid.link/e8b116a8f424128b227734bb1d433c14af478d90.1762995456.git.babu.moger@amd.com
Diffstat (limited to 'fs/resctrl/ctrlmondata.c')
| -rw-r--r-- | fs/resctrl/ctrlmondata.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c index 0d0ef54fc4de..78a8e7b4ba24 100644 --- a/fs/resctrl/ctrlmondata.c +++ b/fs/resctrl/ctrlmondata.c @@ -676,3 +676,24 @@ out: rdtgroup_kn_unlock(of->kn); return ret; } + +int resctrl_io_alloc_show(struct kernfs_open_file *of, struct seq_file *seq, void *v) +{ + struct resctrl_schema *s = rdt_kn_parent_priv(of->kn); + struct rdt_resource *r = s->res; + + mutex_lock(&rdtgroup_mutex); + + if (r->cache.io_alloc_capable) { + if (resctrl_arch_get_io_alloc_enabled(r)) + seq_puts(seq, "enabled\n"); + else + seq_puts(seq, "disabled\n"); + } else { + seq_puts(seq, "not supported\n"); + } + + mutex_unlock(&rdtgroup_mutex); + + return 0; +} |