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Message-Id: <20180824104519.11203-4-james.morse@arm.com>
Date: Fri, 24 Aug 2018 11:45:02 +0100
From: James Morse <james.morse@....com>
To: linux-kernel@...r.kernel.org
Cc: x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
Fenghua Yu <fenghua.yu@...el.com>,
Tony Luck <tony.luck@...el.com>,
Ingo Molnar <mingo@...hat.com>, H Peter Anvin <hpa@...or.com>,
Reinette Chatre <reinette.chatre@...el.com>,
Vikas Shivappa <vikas.shivappa@...ux.intel.com>
Subject: [RFC PATCH 03/20] x86/intel_rdt: Group staged configuration into a separate struct
We want to merge the L2/L2CODE/L2DATA resources to be a single resource,
but we still need to be able to apply separate CODE and DATA schema to
the domain.
Move the new_ctrl bitmap value and flag into a struct, and create an
array of them. Today there is only one element in the array, but
eventually resctrl will use the array slots for CODE/DATA/BOTH to
detect a duplicate schema being written.
Signed-off-by: James Morse <james.morse@....com>
---
arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c | 44 +++++++++++++++------
include/linux/resctrl.h | 16 ++++++--
2 files changed, 43 insertions(+), 17 deletions(-)
diff --git a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
index e3dcb5161122..1068a19e03c5 100644
--- a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
+++ b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
@@ -67,16 +67,17 @@ static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
int parse_bw(char *buf, struct rdt_resource *r, struct rdt_domain *d)
{
unsigned long data;
+ struct resctrl_staged_config *cfg = &d->staged_config[0];
- if (d->have_new_ctrl) {
+ if (cfg->have_new_ctrl) {
rdt_last_cmd_printf("duplicate domain %d\n", d->id);
return -EINVAL;
}
if (!bw_validate(buf, &data, r))
return -EINVAL;
- d->new_ctrl = data;
- d->have_new_ctrl = true;
+ cfg->new_ctrl = data;
+ cfg->have_new_ctrl = true;
return 0;
}
@@ -129,16 +130,17 @@ static bool cbm_validate(char *buf, unsigned long *data, struct rdt_resource *r)
int parse_cbm(char *buf, struct rdt_resource *r, struct rdt_domain *d)
{
unsigned long data;
+ struct resctrl_staged_config *cfg = &d->staged_config[0];
- if (d->have_new_ctrl) {
+ if (cfg->have_new_ctrl) {
rdt_last_cmd_printf("duplicate domain %d\n", d->id);
return -EINVAL;
}
if(!cbm_validate(buf, &data, r))
return -EINVAL;
- d->new_ctrl = data;
- d->have_new_ctrl = true;
+ cfg->new_ctrl = data;
+ cfg->have_new_ctrl = true;
return 0;
}
@@ -175,15 +177,29 @@ static int parse_line(char *line, struct rdt_resource *r)
return -EINVAL;
}
+static void apply_config(struct rdt_hw_domain *hw_dom,
+ struct resctrl_staged_config *cfg, int closid,
+ cpumask_var_t cpu_mask, bool mba_sc)
+{
+ u32 *dc = !mba_sc ? hw_dom->ctrl_val : hw_dom->mbps_val;
+
+ if (cfg->new_ctrl != dc[closid]) {
+ cpumask_set_cpu(cpumask_any(&hw_dom->resctrl.cpu_mask),
+ cpu_mask);
+ dc[closid] = cfg->new_ctrl;
+ cfg->have_new_ctrl = false;
+ }
+}
+
static int update_domains(struct rdt_resource *r, int closid)
{
+ struct resctrl_staged_config *cfg;
struct rdt_hw_domain *hw_dom;
struct msr_param msr_param;
cpumask_var_t cpu_mask;
struct rdt_domain *d;
bool mba_sc;
- u32 *dc;
- int cpu;
+ int i, cpu;
if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
return -ENOMEM;
@@ -195,10 +211,12 @@ static int update_domains(struct rdt_resource *r, int closid)
mba_sc = is_mba_sc(r);
list_for_each_entry(d, &r->domains, list) {
hw_dom = rc_dom_to_rdt(d);
- dc = !mba_sc ? hw_dom->ctrl_val : hw_dom->mbps_val;
- if (d->have_new_ctrl && d->new_ctrl != dc[closid]) {
- cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
- dc[closid] = d->new_ctrl;
+ for (i = 0; i < ARRAY_SIZE(d->staged_config); i++) {
+ cfg = &hw_dom->resctrl.staged_config[i];
+ if (!cfg->have_new_ctrl)
+ continue;
+
+ apply_config(hw_dom, cfg, closid, cpu_mask, mba_sc);
}
}
@@ -259,7 +277,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
for_each_alloc_enabled_rdt_resource(r) {
list_for_each_entry(dom, &r->domains, list)
- dom->have_new_ctrl = false;
+ memset(dom->staged_config, 0, sizeof(dom->staged_config));
}
while ((tok = strsep(&buf, "\n")) != NULL) {
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 5950c30fcc30..0b57a55f4b3d 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -7,21 +7,29 @@
#include <linux/list.h>
#include <linux/kernel.h>
+/**
+ * struct resctrl_staged_config - parsed configuration to be applied
+ * @new_ctrl: new ctrl value to be loaded
+ * @have_new_ctrl: did user provide new_ctrl for this domain
+ */
+struct resctrl_staged_config {
+ u32 new_ctrl;
+ bool have_new_ctrl;
+};
+
/**
* struct rdt_domain - group of cpus sharing an RDT resource
* @list: all instances of this resource
* @id: unique id for this instance
* @cpu_mask: which cpus share this resource
- * @new_ctrl: new ctrl value to be loaded
- * @have_new_ctrl: did user provide new_ctrl for this domain
+ * @staged_config: parsed configuration to be applied
*/
struct rdt_domain {
struct list_head list;
int id;
struct cpumask cpu_mask;
- u32 new_ctrl;
- bool have_new_ctrl;
+ struct resctrl_staged_config staged_config[1];
};
/**
--
2.18.0
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