[tip: x86/cache] x86/resctrl: Allow different CODE/DATA configurations to be staged

["tip-bot2 for James Morse" <tip-bot2@linutronix.de>]

The following commit has been merged into the x86/cache branch of tip:

Commit-ID:     75408e43509ed6207870c0e7e28656acbbc1f7fd
Gitweb:        https://git.kernel.org/tip/75408e43509ed6207870c0e7e28656acbbc1f7fd
Author:        James Morse <james.morse@arm.com>
AuthorDate:    Wed, 28 Jul 2021 17:06:27 
Committer:     Borislav Petkov <bp@suse.de>
CommitterDate: Wed, 11 Aug 2021 16:33:42 +02:00

x86/resctrl: Allow different CODE/DATA configurations to be staged

Before the CDP resources can be merged, struct rdt_domain will need an
array of struct resctrl_staged_config, one per type of configuration.

Use the type as an index to the array to ensure that a schema
configuration string can't specify the same domain twice. This will
allow two schemata to apply configuration changes to one resource.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lkml.kernel.org/r/20210728170637.25610-15-james.morse@arm.com
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 20 ++++++++++++++------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    |  5 +++--
 include/linux/resctrl.h                   |  4 +++-
 3 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 9ddfa76..f29848f 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -60,10 +60,11 @@ static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
 int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
 	     struct rdt_domain *d)
 {
+	struct resctrl_staged_config *cfg;
 	struct rdt_resource *r = s->res;
 	unsigned long bw_val;
-	struct resctrl_staged_config *cfg = &d->staged_config;
 
+	cfg = &d->staged_config[s->conf_type];
 	if (cfg->have_new_ctrl) {
 		rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
 		return -EINVAL;
@@ -130,11 +131,12 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
 int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 	      struct rdt_domain *d)
 {
-	struct resctrl_staged_config *cfg = &d->staged_config;
 	struct rdtgroup *rdtgrp = data->rdtgrp;
+	struct resctrl_staged_config *cfg;
 	struct rdt_resource *r = s->res;
 	u32 cbm_val;
 
+	cfg = &d->staged_config[s->conf_type];
 	if (cfg->have_new_ctrl) {
 		rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
 		return -EINVAL;
@@ -192,6 +194,7 @@ int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 static int parse_line(char *line, struct resctrl_schema *s,
 		      struct rdtgroup *rdtgrp)
 {
+	enum resctrl_conf_type t = s->conf_type;
 	struct resctrl_staged_config *cfg;
 	struct rdt_resource *r = s->res;
 	struct rdt_parse_data data;
@@ -222,7 +225,7 @@ next:
 			if (r->parse_ctrlval(&data, s, d))
 				return -EINVAL;
 			if (rdtgrp->mode ==  RDT_MODE_PSEUDO_LOCKSETUP) {
-				cfg = &d->staged_config;
+				cfg = &d->staged_config[t];
 				/*
 				 * In pseudo-locking setup mode and just
 				 * parsed a valid CBM that should be
@@ -261,6 +264,7 @@ 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;
+	enum resctrl_conf_type t;
 	cpumask_var_t cpu_mask;
 	struct rdt_domain *d;
 	bool mba_sc;
@@ -276,9 +280,13 @@ 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 = resctrl_to_arch_dom(d);
-		cfg = &hw_dom->d_resctrl.staged_config;
-		if (cfg->have_new_ctrl)
+		for (t = 0; t < CDP_NUM_TYPES; t++) {
+			cfg = &hw_dom->d_resctrl.staged_config[t];
+			if (!cfg->have_new_ctrl)
+				continue;
+
 			apply_config(hw_dom, cfg, closid, cpu_mask, mba_sc);
+		}
 	}
 
 	/*
@@ -350,7 +358,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 
 	list_for_each_entry(s, &resctrl_schema_all, list) {
 		list_for_each_entry(dom, &s->res->domains, list)
-			memset(&dom->staged_config, 0, sizeof(dom->staged_config));
+			memset(dom->staged_config, 0, sizeof(dom->staged_config));
 	}
 
 	while ((tok = strsep(&buf, "\n")) != NULL) {
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 62cc82d..9f1354c 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2751,6 +2751,7 @@ static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
 static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 				 u32 closid)
 {
+	enum resctrl_conf_type t = s->conf_type;
 	struct rdt_resource *r_cdp = NULL;
 	struct resctrl_staged_config *cfg;
 	struct rdt_domain *d_cdp = NULL;
@@ -2762,7 +2763,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 	int i;
 
 	rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp);
-	cfg = &d->staged_config;
+	cfg = &d->staged_config[t];
 	cfg->have_new_ctrl = false;
 	cfg->new_ctrl = r->cache.shareable_bits;
 	used_b = r->cache.shareable_bits;
@@ -2846,7 +2847,7 @@ static void rdtgroup_init_mba(struct rdt_resource *r)
 	struct rdt_domain *d;
 
 	list_for_each_entry(d, &r->domains, list) {
-		cfg = &d->staged_config;
+		cfg = &d->staged_config[CDP_NONE];
 		cfg->new_ctrl = is_mba_sc(r) ? MBA_MAX_MBPS : r->default_ctrl;
 		cfg->have_new_ctrl = true;
 	}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index ff7f7d7..51ba372 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -27,6 +27,8 @@ enum resctrl_conf_type {
 	CDP_DATA,
 };
 
+#define CDP_NUM_TYPES	(CDP_DATA + 1)
+
 /**
  * struct resctrl_staged_config - parsed configuration to be applied
  * @new_ctrl:		new ctrl value to be loaded
@@ -64,7 +66,7 @@ struct rdt_domain {
 	int				mbm_work_cpu;
 	int				cqm_work_cpu;
 	struct pseudo_lock_region	*plr;
-	struct resctrl_staged_config	staged_config;
+	struct resctrl_staged_config	staged_config[CDP_NUM_TYPES];
 };
 
 /**