[PATCH v2 09/24] x86/resctrl: Pass the schema to resctrl filesystem functions

James Morse
2021-03-12T18:01:06Z

Once the arch code is abstracted from the resctrl filesystem code
the separate schema for CDP are created by the filesystem code. This
means the same resource is used for different schema, or types of
configuration.

Helpers like rdtgroup_cbm_overlaps() will need the resctrl_schema
to retrieve the configuration (or configurations) as this is where
properties like the name, closid limit and CODE/DATA/BOTH type
are stored.

Change these functions to take a struct schema instead of the
struct rdt_resource.

All the modified functions eventually move to be part of the
filesystem code.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v1:
* split from a larger patch
---
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 23 +++++++++++++----------
arch/x86/kernel/cpu/resctrl/internal.h | 6 +++---
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 19 +++++++++++--------
include/linux/resctrl.h | 3 ++-
4 files changed, 29 insertions(+), 22 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index fcd6ca73ac41..dbbdd9f275e9 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -57,9 +57,10 @@ static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
return true;
}

-int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
+int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
struct rdt_domain *d)
{
+ struct rdt_resource *r = s->res;
unsigned long bw_val;

if (d->have_new_ctrl) {
@@ -125,10 +126,11 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
* Read one cache bit mask (hex). Check that it is valid for the current
* resource type.
*/
-int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
+int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
struct rdt_domain *d)
{
struct rdtgroup *rdtgrp = data->rdtgrp;
+ struct rdt_resource *r = s->res;
u32 cbm_val;

if (d->have_new_ctrl) {
@@ -160,12 +162,12 @@ int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
* The CBM may not overlap with the CBM of another closid if
* either is exclusive.
*/
- if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, true)) {
+ if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, true)) {
rdt_last_cmd_puts("Overlaps with exclusive group\n");
return -EINVAL;
}

- if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, false)) {
+ if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, false)) {
if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
rdt_last_cmd_puts("Overlaps with other group\n");
@@ -185,9 +187,10 @@ int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
* separated by ";". The "id" is in decimal, and must match one of
* the "id"s for this resource.
*/
-static int parse_line(char *line, struct rdt_resource *r,
+static int parse_line(char *line, struct resctrl_schema *s,
struct rdtgroup *rdtgrp)
{
+ struct rdt_resource *r = s->res;
struct rdt_parse_data data;
char *dom = NULL, *id;
struct rdt_domain *d;
@@ -213,7 +216,7 @@ static int parse_line(char *line, struct rdt_resource *r,
if (d->id == dom_id) {
data.buf = dom;
data.rdtgrp = rdtgrp;
- if (r->parse_ctrlval(&data, r, d))
+ if (r->parse_ctrlval(&data, s, d))
return -EINVAL;
if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
/*
@@ -292,7 +295,7 @@ static int rdtgroup_parse_resource(char *resname, char *tok,
list_for_each_entry(s, &resctrl_schema_all, list) {
r = s->res;
if (!strcmp(resname, r->name) && rdtgrp->closid < s->num_closid)
- return parse_line(tok, r, rdtgrp);
+ return parse_line(tok, s, rdtgrp);
}
rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
return -EINVAL;
@@ -377,8 +380,9 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
return ret ?: nbytes;
}

-static void show_doms(struct seq_file *s, struct rdt_resource *r, int closid)
+static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
{
+ struct rdt_resource *r = schema->res;
struct rdt_hw_domain *hw_dom;
struct rdt_domain *dom;
bool sep = false;
@@ -429,9 +433,8 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
} else {
closid = rdtgrp->closid;
list_for_each_entry(schema, &resctrl_schema_all, list) {
- r = schema->res;
if (closid < schema->num_closid)
- show_doms(s, r, closid);
+ show_doms(s, schema, closid);
}
}
} else {
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 51a6e5f2f035..97f1fff90147 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -383,9 +383,9 @@ static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r
return container_of(r, struct rdt_hw_resource, resctrl);
}

-int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
+int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
struct rdt_domain *d);
-int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
+int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
struct rdt_domain *d);

extern struct mutex rdtgroup_mutex;
@@ -483,7 +483,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off);
int rdtgroup_schemata_show(struct kernfs_open_file *of,
struct seq_file *s, void *v);
-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);
unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d,
unsigned long cbm);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index a8d8499e6919..368cb3a16cfd 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1221,7 +1221,7 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d

/**
* rdtgroup_cbm_overlaps - Does CBM overlap with other use of hardware
- * @r: Resource to which domain instance @d belongs.
+ * @s: Schema for the resource to which domain instance @d belongs.
* @d: The domain instance for which @closid is being tested.
* @cbm: Capacity bitmask being tested.
* @closid: Intended closid for @cbm.
@@ -1239,9 +1239,10 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d
*
* Return: true if CBM overlap detected, false if there is no overlap
*/
-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)
{
+ struct rdt_resource *r = s->res;
struct rdt_resource *r_cdp;
struct rdt_domain *d_cdp;

@@ -1282,7 +1283,8 @@ static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
has_cache = true;
list_for_each_entry(d, &r->domains, list) {
hw_dom = resctrl_to_arch_dom(d);
- if (rdtgroup_cbm_overlaps(r, d, hw_dom->ctrl_val[closid],
+ if (rdtgroup_cbm_overlaps(s, d,
+ hw_dom->ctrl_val[closid],
rdtgrp->closid, false)) {
rdt_last_cmd_puts("Schemata overlaps\n");
return false;
@@ -2712,11 +2714,12 @@ static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
* Set the RDT domain up to start off with all usable allocations. That is,
* all shareable and unused bits. All-zero CBM is invalid.
*/
-static int __init_one_rdt_domain(struct rdt_domain *d, struct rdt_resource *r,
+static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
u32 closid)
{
struct rdt_resource *r_cdp = NULL;
struct rdt_domain *d_cdp = NULL;
+ struct rdt_resource *r = s->res;
u32 used_b = 0, unused_b = 0;
unsigned long tmp_cbm;
enum rdtgrp_mode mode;
@@ -2786,13 +2789,13 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct rdt_resource *r,
* If there are no more shareable bits available on any domain then
* the entire allocation will fail.
*/
-static int rdtgroup_init_cat(struct rdt_resource *r, u32 closid)
+static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
{
struct rdt_domain *d;
int ret;

- list_for_each_entry(d, &r->domains, list) {
- ret = __init_one_rdt_domain(d, r, closid);
+ list_for_each_entry(d, &s->res->domains, list) {
+ ret = __init_one_rdt_domain(d, s, closid);
if (ret < 0)
return ret;
}
@@ -2823,7 +2826,7 @@ static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
if (r->rid == RDT_RESOURCE_MBA) {
rdtgroup_init_mba(r);
} else {
- ret = rdtgroup_init_cat(r, rdtgrp->closid);
+ ret = rdtgroup_init_cat(s, rdtgrp->closid);
if (ret < 0)
return ret;
}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 5bd48c1ed497..60650ec08eb2 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -115,6 +115,7 @@ struct resctrl_membw {
};

struct rdt_parse_data;
+struct resctrl_schema;

/**
* struct rdt_resource - attributes of a resctrl resource
@@ -153,7 +154,7 @@ struct rdt_resource {
u32 default_ctrl;
const char *format_str;
int (*parse_ctrlval)(struct rdt_parse_data *data,
- struct rdt_resource *r,
+ struct resctrl_schema *s,
struct rdt_domain *d);
struct list_head evt_list;
unsigned long fflags;
--
2.30.0