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Message-ID: <f6d15921bff2d698d0cc0b2a35d2361c846203e6.1749848715.git.babu.moger@amd.com>
Date: Fri, 13 Jun 2025 16:04:52 -0500
From: Babu Moger <babu.moger@....com>
To: <babu.moger@....com>, <corbet@....net>, <tony.luck@...el.com>,
<reinette.chatre@...el.com>, <Dave.Martin@....com>, <james.morse@....com>,
<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
<dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <akpm@...ux-foundation.org>,
<rostedt@...dmis.org>, <paulmck@...nel.org>, <thuth@...hat.com>,
<ardb@...nel.org>, <gregkh@...uxfoundation.org>, <seanjc@...gle.com>,
<thomas.lendacky@....com>, <pawan.kumar.gupta@...ux.intel.com>,
<manali.shukla@....com>, <perry.yuan@....com>, <kai.huang@...el.com>,
<peterz@...radead.org>, <xiaoyao.li@...el.com>, <kan.liang@...ux.intel.com>,
<mario.limonciello@....com>, <xin3.li@...el.com>, <gautham.shenoy@....com>,
<xin@...or.com>, <chang.seok.bae@...el.com>, <fenghuay@...dia.com>,
<peternewman@...gle.com>, <maciej.wieczor-retman@...el.com>,
<eranian@...gle.com>, <linux-doc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH v14 08/32] x86,fs/resctrl: Consolidate monitoring related data from rdt_resource
The cache allocation and memory bandwidth allocation feature properties
are consolidated into struct resctrl_cache and struct resctrl_membw
respectively.
In preparation for more monitoring properties that will clobber the
existing resource struct more, re-organize the monitoring specific
properties to also be in a separate structure.
Suggested-by: Reinette Chatre <reinette.chatre@...el.com>
Signed-off-by: Babu Moger <babu.moger@....com>
---
v14: Updated the code comment in resctrl.h.
v13: Changes due to FS/ARCH restructure.
v12: Fixed the conflicts due to recent changes in rdt_resource data structure.
Added new mbm_cfg_mask field to resctrl_mon.
Removed Reviewed-by tag as patch has changed.
v11: No changes.
v10: No changes.
v9: No changes.
v8: Added Reviewed-by from Reinette. No other changes.
v7: Added kernel doc for data structure. Minor text update.
v6: Update commit message and update kernel doc for rdt_resource.
v5: Commit message update.
Also changes related to data structure updates does to SNC support.
v4: New patch.
---
arch/x86/kernel/cpu/resctrl/core.c | 4 ++--
arch/x86/kernel/cpu/resctrl/monitor.c | 10 +++++-----
fs/resctrl/rdtgroup.c | 6 +++---
include/linux/resctrl.h | 18 +++++++++++++-----
4 files changed, 23 insertions(+), 15 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 6426b92492dc..22a414802cbb 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -107,7 +107,7 @@ u32 resctrl_arch_system_num_rmid_idx(void)
struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
/* RMID are independent numbers for x86. num_rmid_idx == num_rmid */
- return r->num_rmid;
+ return r->mon.num_rmid;
}
struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l)
@@ -539,7 +539,7 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
arch_mon_domain_online(r, d);
- if (arch_domain_mbm_alloc(r->num_rmid, hw_dom)) {
+ if (arch_domain_mbm_alloc(r->mon.num_rmid, hw_dom)) {
mon_domain_free(hw_dom);
return;
}
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 0add57b29a4d..42a9e3cc6654 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -130,7 +130,7 @@ static int logical_rmid_to_physical_rmid(int cpu, int lrmid)
if (snc_nodes_per_l3_cache == 1)
return lrmid;
- return lrmid + (cpu_to_node(cpu) % snc_nodes_per_l3_cache) * r->num_rmid;
+ return lrmid + (cpu_to_node(cpu) % snc_nodes_per_l3_cache) * r->mon.num_rmid;
}
static int __rmid_read_phys(u32 prmid, enum resctrl_event_id eventid, u64 *val)
@@ -205,7 +205,7 @@ void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_mon_domain *
continue;
idx = MBM_STATE_IDX(eventid);
memset(hw_dom->arch_mbm_states[idx], 0,
- sizeof(struct arch_mbm_state) * r->num_rmid);
+ sizeof(struct arch_mbm_state) * r->mon.num_rmid);
}
}
@@ -344,7 +344,7 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
resctrl_rmid_realloc_limit = boot_cpu_data.x86_cache_size * 1024;
hw_res->mon_scale = boot_cpu_data.x86_cache_occ_scale / snc_nodes_per_l3_cache;
- r->num_rmid = (boot_cpu_data.x86_cache_max_rmid + 1) / snc_nodes_per_l3_cache;
+ r->mon.num_rmid = (boot_cpu_data.x86_cache_max_rmid + 1) / snc_nodes_per_l3_cache;
hw_res->mbm_width = MBM_CNTR_WIDTH_BASE;
if (mbm_offset > 0 && mbm_offset <= MBM_CNTR_WIDTH_OFFSET_MAX)
@@ -359,7 +359,7 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
*
* For a 35MB LLC and 56 RMIDs, this is ~1.8% of the LLC.
*/
- threshold = resctrl_rmid_realloc_limit / r->num_rmid;
+ threshold = resctrl_rmid_realloc_limit / r->mon.num_rmid;
/*
* Because num_rmid may not be a power of two, round the value
@@ -373,7 +373,7 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
/* Detect list of bandwidth sources that can be tracked */
cpuid_count(0x80000020, 3, &eax, &ebx, &ecx, &edx);
- r->mbm_cfg_mask = ecx & MAX_EVT_CONFIG_BITS;
+ r->mon.mbm_cfg_mask = ecx & MAX_EVT_CONFIG_BITS;
}
r->mon_capable = true;
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index bd6718f0ffd6..5874cfdf8d8d 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -1135,7 +1135,7 @@ static int rdt_num_rmids_show(struct kernfs_open_file *of,
{
struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
- seq_printf(seq, "%d\n", r->num_rmid);
+ seq_printf(seq, "%d\n", r->mon.num_rmid);
return 0;
}
@@ -1731,9 +1731,9 @@ static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
}
/* Value from user cannot be more than the supported set of events */
- if ((val & r->mbm_cfg_mask) != val) {
+ if ((val & r->mon.mbm_cfg_mask) != val) {
rdt_last_cmd_printf("Invalid event configuration: max valid mask is 0x%02x\n",
- r->mbm_cfg_mask);
+ r->mon.mbm_cfg_mask);
return -EINVAL;
}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index bbe57eff962b..22766b8b670b 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -255,38 +255,46 @@ enum resctrl_schema_fmt {
RESCTRL_SCHEMA_RANGE,
};
+/**
+ * struct resctrl_mon - Monitoring related data of a resctrl resource.
+ * @num_rmid: Number of RMIDs available.
+ * @mbm_cfg_mask: Memory transactions that can be tracked when bandwidth
+ * monitoring events are configured.
+ */
+struct resctrl_mon {
+ int num_rmid;
+ unsigned int mbm_cfg_mask;
+};
+
/**
* 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
* @ctrl_scope: Scope of this resource for control functions
* @mon_scope: Scope of this resource for monitor functions
* @cache: Cache allocation related data
* @membw: If the component has bandwidth controls, their properties.
+ * @mon: Monitoring related data.
* @ctrl_domains: RCU list of all control domains for this resource
* @mon_domains: RCU list of all monitor domains for this resource
* @name: Name to use in "schemata" file.
* @schema_fmt: Which format string and parser is used for this schema.
- * @mbm_cfg_mask: Bandwidth sources that can be tracked when bandwidth
- * monitoring events can be configured.
* @cdp_capable: Is the CDP feature available on this resource
*/
struct rdt_resource {
int rid;
bool alloc_capable;
bool mon_capable;
- int num_rmid;
enum resctrl_scope ctrl_scope;
enum resctrl_scope mon_scope;
struct resctrl_cache cache;
struct resctrl_membw membw;
+ struct resctrl_mon mon;
struct list_head ctrl_domains;
struct list_head mon_domains;
char *name;
enum resctrl_schema_fmt schema_fmt;
- unsigned int mbm_cfg_mask;
bool cdp_capable;
};
--
2.34.1
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