linux-kernel - [PATCH v4 4/7] x86/resctrl: Re-arrange RFTYPE flags and add more comments

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Date:   Mon, 17 Apr 2023 18:34:38 -0500
From:   Babu Moger <babu.moger@....com>
To:     <corbet@....net>, <reinette.chatre@...el.com>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>
CC:     <fenghua.yu@...el.com>, <dave.hansen@...ux.intel.com>,
        <x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
        <akpm@...ux-foundation.org>, <quic_neeraju@...cinc.com>,
        <rdunlap@...radead.org>, <damien.lemoal@...nsource.wdc.com>,
        <songmuchun@...edance.com>, <peterz@...radead.org>,
        <jpoimboe@...nel.org>, <pbonzini@...hat.com>, <babu.moger@....com>,
        <chang.seok.bae@...el.com>, <pawan.kumar.gupta@...ux.intel.com>,
        <jmattson@...gle.com>, <daniel.sneddon@...ux.intel.com>,
        <sandipan.das@....com>, <tony.luck@...el.com>,
        <james.morse@....com>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <bagasdotme@...il.com>,
        <eranian@...gle.com>, <christophe.leroy@...roup.eu>,
        <pawan.kumar.gupta@...ux.intel.com>, <jarkko@...nel.org>,
        <adrian.hunter@...el.com>, <quic_jiles@...cinc.com>,
        <peternewman@...gle.com>, <babu.moger@....com>
Subject: [PATCH v4 4/7] x86/resctrl: Re-arrange RFTYPE flags and add more
 comments

Remove gaps in bit definitions of RFTYPE flags and add more comments
to make it easy for future additions.

Signed-off-by: Babu Moger <babu.moger@....com>
---
 arch/x86/kernel/cpu/resctrl/internal.h |   49 +++++++++++++++++++++++++++++---
 1 file changed, 44 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index c4fc5a1c630c..75ddbd833fdf 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -240,14 +240,53 @@ 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 (Displays information about control and monitoring)
+ *     |
+ *     --> base (Displays the details on resctrl groups)
+ *
+ *    -------------------------------------------------------------
+ *     info directory structure
+ *     --> RFTYPE_INFO
+ *         --> RFTYPE_TOP_INFO
+ *             last_cmd_status
+ *
+ *         --> RFTYPE_MON_INFO
+ *            --> (L2_MON)
+ *            --> (L3_MON)
+ *                max_threshold_occupancy, mbm_local_bytes_config,
+ *                mbm_total_bytes_config, mon_features, num_rmids
+ *
+ *         --> RFTYPE_CTRL_INFO
+ *            --> RFTYPE_RES_CACHE (L2, L3)
+ *                bit_usage, cbm_mask, min_cbm_bits, num_closids,
+ *                shareable_bits
+ *
+ *            --> RFTYPE_RES_MB (MB, SMBA)
+ *                bandwidth_gran, delay_linear, min_bandwidth,
+ *                num_closids
+ *
+ *     group structure
+ *     -----------------------------------------------------------
+ *     --> RFTYPE_BASE (Files common for both MON and CTRL groups)
+ *         cpus, cpus_list, tasks
+ *
+ *     --> RFTYPE_CTRL_BASE (Files only for CTRL group)
+ *         mode, schemata, size
  */
 #define RFTYPE_INFO			BIT(0)
 #define RFTYPE_BASE			BIT(1)
-#define RFTYPE_CTRL			BIT(4)
-#define RFTYPE_MON			BIT(5)
-#define RFTYPE_TOP			BIT(6)
-#define RFTYPE_RES_CACHE		BIT(8)
-#define RFTYPE_RES_MB			BIT(9)
+#define RFTYPE_CTRL			BIT(2)
+#define RFTYPE_MON			BIT(3)
+#define RFTYPE_TOP			BIT(4)
+#define RFTYPE_RES_CACHE		BIT(5)
+#define RFTYPE_RES_MB			BIT(6)
 #define RFTYPE_CTRL_INFO		(RFTYPE_INFO | RFTYPE_CTRL)
 #define RFTYPE_MON_INFO			(RFTYPE_INFO | RFTYPE_MON)
 #define RFTYPE_TOP_INFO			(RFTYPE_INFO | RFTYPE_TOP)