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Date: Fri, 23 Sep 2022 18:01:53 -0000
From: "tip-bot2 for James Morse" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: James Morse <james.morse@....com>, Borislav Petkov <bp@...e.de>,
Jamie Iles <quic_jiles@...cinc.com>,
Shaopeng Tan <tan.shaopeng@...itsu.com>,
Reinette Chatre <reinette.chatre@...el.com>,
Xin Hao <xhao@...ux.alibaba.com>,
Cristian Marussi <cristian.marussi@....com>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: x86/cache] x86/resctrl: Create mba_sc configuration in the rdt_domain
The following commit has been merged into the x86/cache branch of tip:
Commit-ID: 781096d971dfe3c5f9401a300bdb0b148a600584
Gitweb: https://git.kernel.org/tip/781096d971dfe3c5f9401a300bdb0b148a600584
Author: James Morse <james.morse@....com>
AuthorDate: Fri, 02 Sep 2022 15:48:16
Committer: Borislav Petkov <bp@...e.de>
CommitterDate: Thu, 22 Sep 2022 17:17:59 +02:00
x86/resctrl: Create mba_sc configuration in the rdt_domain
To support resctrl's MBA software controller, the architecture must provide
a second configuration array to hold the mbps_val[] from user-space.
This complicates the interface between the architecture specific code and
the filesystem portions of resctrl that will move to /fs/, to allow
multiple architectures to support resctrl.
Make the filesystem parts of resctrl create an array for the mba_sc
values. The software controller can be changed to use this, allowing
the architecture code to only consider the values configured in hardware.
Signed-off-by: James Morse <james.morse@....com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Jamie Iles <quic_jiles@...cinc.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@...itsu.com>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Tested-by: Xin Hao <xhao@...ux.alibaba.com>
Tested-by: Shaopeng Tan <tan.shaopeng@...itsu.com>
Tested-by: Cristian Marussi <cristian.marussi@....com>
Link: https://lore.kernel.org/r/20220902154829.30399-9-james.morse@arm.com
---
arch/x86/kernel/cpu/resctrl/internal.h | 1 +-
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 39 +++++++++++++++++++++++++-
include/linux/resctrl.h | 7 ++++-
3 files changed, 46 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index e12b55f..a7e2cbc 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -36,7 +36,6 @@
#define MBM_OVERFLOW_INTERVAL 1000
#define MAX_MBA_BW 100u
#define MBA_IS_LINEAR 0x4
-#define MBA_MAX_MBPS U32_MAX
#define MAX_MBA_BW_AMD 0x800
#define MBM_CNTR_WIDTH_OFFSET_AMD 20
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 4ee2626..f7ebd01 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1889,6 +1889,30 @@ void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
l3_qos_cfg_update(&hw_res->cdp_enabled);
}
+static int mba_sc_domain_allocate(struct rdt_resource *r, struct rdt_domain *d)
+{
+ u32 num_closid = resctrl_arch_get_num_closid(r);
+ int cpu = cpumask_any(&d->cpu_mask);
+ int i;
+
+ d->mbps_val = kcalloc_node(num_closid, sizeof(*d->mbps_val),
+ GFP_KERNEL, cpu_to_node(cpu));
+ if (!d->mbps_val)
+ return -ENOMEM;
+
+ for (i = 0; i < num_closid; i++)
+ d->mbps_val[i] = MBA_MAX_MBPS;
+
+ return 0;
+}
+
+static void mba_sc_domain_destroy(struct rdt_resource *r,
+ struct rdt_domain *d)
+{
+ kfree(d->mbps_val);
+ d->mbps_val = NULL;
+}
+
/*
* MBA software controller is supported only if
* MBM is supported and MBA is in linear scale.
@@ -1908,12 +1932,20 @@ static bool supports_mba_mbps(void)
static int set_mba_sc(bool mba_sc)
{
struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
+ u32 num_closid = resctrl_arch_get_num_closid(r);
+ struct rdt_domain *d;
+ int i;
if (!supports_mba_mbps() || mba_sc == is_mba_sc(r))
return -EINVAL;
r->membw.mba_sc = mba_sc;
+ list_for_each_entry(d, &r->domains, list) {
+ for (i = 0; i < num_closid; i++)
+ d->mbps_val[i] = MBA_MAX_MBPS;
+ }
+
return 0;
}
@@ -3247,6 +3279,9 @@ void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
{
lockdep_assert_held(&rdtgroup_mutex);
+ if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA)
+ mba_sc_domain_destroy(r, d);
+
if (!r->mon_capable)
return;
@@ -3311,6 +3346,10 @@ int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d)
lockdep_assert_held(&rdtgroup_mutex);
+ if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA)
+ /* RDT_RESOURCE_MBA is never mon_capable */
+ return mba_sc_domain_allocate(r, d);
+
if (!r->mon_capable)
return 0;
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 5d283bd..93dfe55 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -15,6 +15,9 @@ int proc_resctrl_show(struct seq_file *m,
#endif
+/* max value for struct rdt_domain's mbps_val */
+#define MBA_MAX_MBPS U32_MAX
+
/**
* enum resctrl_conf_type - The type of configuration.
* @CDP_NONE: No prioritisation, both code and data are controlled or monitored.
@@ -53,6 +56,9 @@ struct resctrl_staged_config {
* @cqm_work_cpu: worker CPU for CQM h/w counters
* @plr: pseudo-locked region (if any) associated with domain
* @staged_config: parsed configuration to be applied
+ * @mbps_val: When mba_sc is enabled, this holds the array of user
+ * specified control values for mba_sc in MBps, indexed
+ * by closid
*/
struct rdt_domain {
struct list_head list;
@@ -67,6 +73,7 @@ struct rdt_domain {
int cqm_work_cpu;
struct pseudo_lock_region *plr;
struct resctrl_staged_config staged_config[CDP_NUM_TYPES];
+ u32 *mbps_val;
};
/**
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