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From: Tony Luck <tony.luck@intel.com>
To: Fenghua Yu <fenghua.yu@intel.com>,
	Reinette Chatre <reinette.chatre@intel.com>,
	Peter Newman <peternewman@google.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Shuah Khan <skhan@linuxfoundation.org>,
	x86@kernel.org
Cc: Shaopeng Tan <tan.shaopeng@fujitsu.com>,
	James Morse <james.morse@arm.com>,
	Jamie Iles <quic_jiles@quicinc.com>,
	Babu Moger <babu.moger@amd.com>,
	Randy Dunlap <rdunlap@infradead.org>,
	Drew Fustini <dfustini@baylibre.com>,
	linux-kernel@vger.kernel.org,
	linux-doc@vger.kernel.org,
	patches@lists.linux.dev,
	Tony Luck <tony.luck@intel.com>
Subject: [PATCH v15-RFC 3/8] x86/resctrl: Prepare for non-cache-scoped resources
Date: Tue, 30 Jan 2024 14:20:29 -0800
Message-ID: <20240130222034.37181-4-tony.luck@intel.com>
In-Reply-To: <20240130222034.37181-1-tony.luck@intel.com>
References: <20240126223837.21835-1-tony.luck@intel.com>
 <20240130222034.37181-1-tony.luck@intel.com>
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Not all resources are scoped in line with some level of hardware cache.

Prepare by renaming the "cache_level" field to "scope" and change
the type to an enum to ease adding new scopes.

Signed-off-by: Tony Luck <tony.luck@intel.com>
---
 include/linux/resctrl.h                   |  9 +++++++--
 arch/x86/kernel/cpu/resctrl/core.c        | 14 +++++++-------
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c |  2 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    |  2 +-
 4 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 66942d7fba7f..2155dc15e636 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -144,13 +144,18 @@ struct resctrl_membw {
 struct rdt_parse_data;
 struct resctrl_schema;
 
+enum resctrl_scope {
+	RESCTRL_L2_CACHE = 2,
+	RESCTRL_L3_CACHE = 3,
+};
+
 /**
  * struct rdt_resource - attributes of a resctrl resource
  * @rid:		The index of the resource
  * @alloc_capable:	Is allocation available on this machine
  * @mon_capable:	Is monitor feature available on this machine
  * @num_rmid:		Number of RMIDs available
- * @cache_level:	Which cache level defines scope of this resource
+ * @scope:		Hardware scope for this resource
  * @cache:		Cache allocation related data
  * @membw:		If the component has bandwidth controls, their properties.
  * @domains:		All domains for this resource
@@ -168,7 +173,7 @@ struct rdt_resource {
 	bool			alloc_capable;
 	bool			mon_capable;
 	int			num_rmid;
-	int			cache_level;
+	enum resctrl_scope	scope;
 	struct resctrl_cache	cache;
 	struct resctrl_membw	membw;
 	struct list_head	domains;
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 0828575c3e13..d89dce63397b 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -65,7 +65,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L3_MON,
 			.name			= "L3",
-			.cache_level		= 3,
+			.scope			= RESCTRL_L3_CACHE,
 			.domains		= domain_init(RDT_RESOURCE_L3_MON),
 			.fflags			= RFTYPE_RES_CACHE,
 		},
@@ -75,7 +75,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L3,
 			.name			= "L3",
-			.cache_level		= 3,
+			.scope			= RESCTRL_L3_CACHE,
 			.domains		= domain_init(RDT_RESOURCE_L3),
 			.parse_ctrlval		= parse_cbm,
 			.format_str		= "%d=%0*x",
@@ -89,7 +89,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L2,
 			.name			= "L2",
-			.cache_level		= 2,
+			.scope			= RESCTRL_L2_CACHE,
 			.domains		= domain_init(RDT_RESOURCE_L2),
 			.parse_ctrlval		= parse_cbm,
 			.format_str		= "%d=%0*x",
@@ -103,7 +103,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_MBA,
 			.name			= "MB",
-			.cache_level		= 3,
+			.scope			= RESCTRL_L3_CACHE,
 			.domains		= domain_init(RDT_RESOURCE_MBA),
 			.parse_ctrlval		= parse_bw,
 			.format_str		= "%d=%*u",
@@ -115,7 +115,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_SMBA,
 			.name			= "SMBA",
-			.cache_level		= 3,
+			.scope			= RESCTRL_L3_CACHE,
 			.domains		= domain_init(RDT_RESOURCE_SMBA),
 			.parse_ctrlval		= parse_bw,
 			.format_str		= "%d=%*u",
@@ -514,7 +514,7 @@ static int arch_domain_mbm_alloc(u32 num_rmid, struct rdt_hw_domain *hw_dom)
  */
 static void domain_add_cpu(int cpu, struct rdt_resource *r)
 {
-	int id = get_cpu_cacheinfo_id(cpu, r->cache_level);
+	int id = get_cpu_cacheinfo_id(cpu, r->scope);
 	struct list_head *add_pos = NULL;
 	struct rdt_hw_domain *hw_dom;
 	struct rdt_domain *d;
@@ -564,7 +564,7 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 
 static void domain_remove_cpu(int cpu, struct rdt_resource *r)
 {
-	int id = get_cpu_cacheinfo_id(cpu, r->cache_level);
+	int id = get_cpu_cacheinfo_id(cpu, r->scope);
 	struct rdt_hw_domain *hw_dom;
 	struct rdt_domain *d;
 
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 8f559eeae08e..6a72fb627aa5 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -311,7 +311,7 @@ static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
 	plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
 
 	for (i = 0; i < ci->num_leaves; i++) {
-		if (ci->info_list[i].level == plr->s->res->cache_level) {
+		if (ci->info_list[i].level == plr->s->res->scope) {
 			plr->line_size = ci->info_list[i].coherency_line_size;
 			return 0;
 		}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 9ee3a9906781..eff9d87547c9 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1416,7 +1416,7 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
 	num_b = bitmap_weight(&cbm, r->cache.cbm_len);
 	ci = get_cpu_cacheinfo(cpumask_any(&d->cpu_mask));
 	for (i = 0; i < ci->num_leaves; i++) {
-		if (ci->info_list[i].level == r->cache_level) {
+		if (ci->info_list[i].level == r->scope) {
 			size = ci->info_list[i].size / r->cache.cbm_len * num_b;
 			break;
 		}
-- 
2.43.0