[tip: x86/cache] x86/resctrl: Pass configuration type to resctrl_arch_get_config()

From: tip-bot2 for James Morse
Date: Wed Aug 11 2021 - 15:41:46 EST

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

Commit-ID: fa8f711d2f14381d1a47420b6da94b62e6484c56
Gitweb: https://git.kernel.org/tip/fa8f711d2f14381d1a47420b6da94b62e6484c56
Author: James Morse <james.morse@xxxxxxx>
AuthorDate: Wed, 28 Jul 2021 17:06:30
Committer: Borislav Petkov <bp@xxxxxxx>
CommitterDate: Wed, 11 Aug 2021 17:53:53 +02:00

x86/resctrl: Pass configuration type to resctrl_arch_get_config()

The ctrl_val[] array for a struct rdt_hw_resource only holds
configurations of one type. The type is implicit.

Once the CDP resources are merged, the ctrl_val[] array will hold all
the configurations for the hardware resource. When a particular type of
configuration is needed, it must be specified explicitly.

Pass the expected type from the schema into resctrl_arch_get_config().
Nothing uses this yet, but once a single ctrl_val[] array is used for
the three struct rdt_hw_resources that share hardware, the type will be
used to return the correct configuration value from the shared array.

Signed-off-by: James Morse <james.morse@xxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Reviewed-by: Jamie Iles <jamie@xxxxxxxxxxxx>
Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Tested-by: Babu Moger <babu.moger@xxxxxxx>
Link: https://lkml.kernel.org/r/20210728170637.25610-18-james.morse@xxxxxxx
---
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 5 +--
arch/x86/kernel/cpu/resctrl/monitor.c | 2 +-
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 35 ++++++++++++++--------
include/linux/resctrl.h | 3 +-
4 files changed, 29 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 4da08ba..9ead0c0 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -402,7 +402,7 @@ out:
}

void resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
- u32 closid, u32 *value)
+ u32 closid, enum resctrl_conf_type type, u32 *value)
{
struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);

@@ -424,7 +424,8 @@ static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int clo
if (sep)
seq_puts(s, ";");

- resctrl_arch_get_config(r, dom, closid, &ctrl_val);
+ resctrl_arch_get_config(r, dom, closid, schema->conf_type,
+ &ctrl_val);
seq_printf(s, r->format_str, dom->id, max_data_width,
ctrl_val);
sep = true;
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index e45e715..eb22729 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -442,7 +442,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
hw_dom_mba = resctrl_to_arch_dom(dom_mba);

cur_bw = pmbm_data->prev_bw;
- resctrl_arch_get_config(r_mba, dom_mba, closid, &user_bw);
+ resctrl_arch_get_config(r_mba, dom_mba, closid, CDP_NONE, &user_bw);
delta_bw = pmbm_data->delta_bw;
/*
* resctrl_arch_get_config() chooses the mbps/ctrl value to return
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 6b2be56..61037b2 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -923,7 +923,8 @@ static int rdt_bit_usage_show(struct kernfs_open_file *of,
for (i = 0; i < closids_supported(); i++) {
if (!closid_allocated(i))
continue;
- resctrl_arch_get_config(r, dom, i, &ctrl_val);
+ resctrl_arch_get_config(r, dom, i, s->conf_type,
+ &ctrl_val);
mode = rdtgroup_mode_by_closid(i);
switch (mode) {
case RDT_MODE_SHAREABLE:
@@ -1099,6 +1100,7 @@ static int rdtgroup_mode_show(struct kernfs_open_file *of,
* Used to return the result.
* @d_cdp: RDT domain that shares hardware with @d (RDT domain peer)
* Used to return the result.
+ * @peer_type: The CDP configuration type of the peer resource.
*
* RDT resources are managed independently and by extension the RDT domains
* (RDT resource instances) are managed independently also. The Code and
@@ -1116,7 +1118,8 @@ static int rdtgroup_mode_show(struct kernfs_open_file *of,
*/
static int rdt_cdp_peer_get(struct rdt_resource *r, struct rdt_domain *d,
struct rdt_resource **r_cdp,
- struct rdt_domain **d_cdp)
+ struct rdt_domain **d_cdp,
+ enum resctrl_conf_type *peer_type)
{
struct rdt_resource *_r_cdp = NULL;
struct rdt_domain *_d_cdp = NULL;
@@ -1125,15 +1128,19 @@ static int rdt_cdp_peer_get(struct rdt_resource *r, struct rdt_domain *d,
switch (r->rid) {
case RDT_RESOURCE_L3DATA:
_r_cdp = &rdt_resources_all[RDT_RESOURCE_L3CODE].r_resctrl;
+ *peer_type = CDP_CODE;
break;
case RDT_RESOURCE_L3CODE:
_r_cdp = &rdt_resources_all[RDT_RESOURCE_L3DATA].r_resctrl;
+ *peer_type = CDP_DATA;
break;
case RDT_RESOURCE_L2DATA:
_r_cdp = &rdt_resources_all[RDT_RESOURCE_L2CODE].r_resctrl;
+ *peer_type = CDP_CODE;
break;
case RDT_RESOURCE_L2CODE:
_r_cdp = &rdt_resources_all[RDT_RESOURCE_L2DATA].r_resctrl;
+ *peer_type = CDP_DATA;
break;
default:
ret = -ENOENT;
@@ -1184,7 +1191,8 @@ out:
* Return: false if CBM does not overlap, true if it does.
*/
static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
- unsigned long cbm, int closid, bool exclusive)
+ unsigned long cbm, int closid,
+ enum resctrl_conf_type type, bool exclusive)
{
enum rdtgrp_mode mode;
unsigned long ctrl_b;
@@ -1199,7 +1207,7 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d

/* Check for overlap with other resource groups */
for (i = 0; i < closids_supported(); i++) {
- resctrl_arch_get_config(r, d, i, (u32 *)&ctrl_b);
+ resctrl_arch_get_config(r, d, i, type, (u32 *)&ctrl_b);
mode = rdtgroup_mode_by_closid(i);
if (closid_allocated(i) && i != closid &&
mode != RDT_MODE_PSEUDO_LOCKSETUP) {
@@ -1240,17 +1248,19 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d
bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
unsigned long cbm, int closid, bool exclusive)
{
+ enum resctrl_conf_type peer_type;
struct rdt_resource *r = s->res;
struct rdt_resource *r_cdp;
struct rdt_domain *d_cdp;

- if (__rdtgroup_cbm_overlaps(r, d, cbm, closid, exclusive))
+ if (__rdtgroup_cbm_overlaps(r, d, cbm, closid, s->conf_type,
+ exclusive))
return true;

- if (rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp) < 0)
+ if (rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp, &peer_type) < 0)
return false;

- return __rdtgroup_cbm_overlaps(r_cdp, d_cdp, cbm, closid, exclusive);
+ return __rdtgroup_cbm_overlaps(r_cdp, d_cdp, cbm, closid, peer_type, exclusive);
}

/**
@@ -1280,7 +1290,7 @@ static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
continue;
has_cache = true;
list_for_each_entry(d, &r->domains, list) {
- resctrl_arch_get_config(r, d, closid, &ctrl);
+ resctrl_arch_get_config(r, d, closid, s->conf_type, &ctrl);
if (rdtgroup_cbm_overlaps(s, d, ctrl, closid, false)) {
rdt_last_cmd_puts("Schemata overlaps\n");
return false;
@@ -1454,7 +1464,7 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
size = 0;
} else {
resctrl_arch_get_config(r, d, rdtgrp->closid,
- &ctrl);
+ schema->conf_type, &ctrl);
if (r->rid == RDT_RESOURCE_MBA)
size = ctrl;
else
@@ -2747,6 +2757,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
enum resctrl_conf_type t = s->conf_type;
struct rdt_resource *r_cdp = NULL;
struct resctrl_staged_config *cfg;
+ enum resctrl_conf_type peer_type;
struct rdt_domain *d_cdp = NULL;
struct rdt_resource *r = s->res;
u32 used_b = 0, unused_b = 0;
@@ -2755,7 +2766,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
u32 peer_ctl, ctrl_val;
int i;

- rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp);
+ rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp, &peer_type);
cfg = &d->staged_config[t];
cfg->have_new_ctrl = false;
cfg->new_ctrl = r->cache.shareable_bits;
@@ -2776,10 +2787,10 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
* with an exclusive group.
*/
if (d_cdp)
- resctrl_arch_get_config(r_cdp, d_cdp, i, &peer_ctl);
+ resctrl_arch_get_config(r_cdp, d_cdp, i, peer_type, &peer_ctl);
else
peer_ctl = 0;
- resctrl_arch_get_config(r, d, i, &ctrl_val);
+ resctrl_arch_get_config(r, d, i, s->conf_type, &ctrl_val);
used_b |= ctrl_val | peer_ctl;
if (mode == RDT_MODE_SHAREABLE)
cfg->new_ctrl |= ctrl_val | peer_ctl;
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 3a23094..69d7387 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -201,6 +201,7 @@ struct resctrl_schema {
u32 resctrl_arch_get_num_closid(struct rdt_resource *r);
int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
void resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
- u32 closid, u32 *value);
+ u32 closid, enum resctrl_conf_type type,
+ u32 *value);

#endif /* _RESCTRL_H */

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