resctrl uses RFTYPE flags for creating resctrl directory structure.
Definitions and directory structures are not documented. Add
comments to improve the readability and help future additions.
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
arch/x86/kernel/cpu/resctrl/internal.h | 45 ++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 2051179a3b91..c20cd6acb7a3 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -240,6 +240,51 @@ struct rdtgroup {
/*
* Define the file type flags for base and info directories.
+ *
+ * RESCTRL filesystem has two main components
+ * a. info
+ * b. base
+ *
+ * /sys/fs/resctrl/
+ * |
+ * --> info (directory and provides details on control
+ * | and monitoring resources)
+ * |
+ * --> base (Lists the files and information to interact with control
+ * or monitor groups. Provides details on default control
+ * group when filesystem is created. There is no directory
+ * with name base)
+ *
+ * info structure
+ * -------------------------------------------------------------
+ * --> RFTYPE_INFO
+ * --> <info> directory
+ * --> RFTYPE_TOP_INFO
+ * Files: last_cmd_status
+ *
+ * --> RFTYPE_MON_INFO
+ * --> <L3_MON> directory
+ * Files: max_threshold_occupancy, mbm_local_bytes_config,
+ * mbm_total_bytes_config, mon_features, num_rmids
+ *
+ * --> RFTYPE_CTRL_INFO
+ * --> RFTYPE_RES_CACHE
+ * --> <L2/L3> directory
+ * Files: bit_usage, cbm_mask, min_cbm_bits,
+ * num_closids, shareable_bits
+ *
+ * --> RFTYPE_RES_MB
+ * --> <MB/SMBA> directory
+ * Files: bandwidth_gran, delay_linear, min_bandwidth,
+ * num_closids
+ *
+ * base structure
+ * -----------------------------------------------------------
+ * --> RFTYPE_BASE (Files common for both MON and CTRL groups)
+ * Files: cpus, cpus_list, tasks
+ *
+ * --> RFTYPE_CTRL_BASE (Files only for CTRL group)
+ * Files: mode, schemata, size
*/
#define RFTYPE_INFO BIT(0)
#define RFTYPE_BASE BIT(1)
