Hi Tony,
On 10/20/2023 2:30 PM, Tony Luck wrote:
> Resctrl assumes that control and monitor operations on a resource are
> performed at the same scope.
>
> Prepare for systems that use different scope (specifically L3 scope for
> cache control and NODE scope for cache occupancy and memory bandwidth
> monitoring).
The first paragraph is a generalization of all resources but then the
second paragraph only mentions L3. In preparation for readers seeing
that only L3 resource's monitoring scope initialized it may help
to be specific here that resctrl only supports monitoring on L3.
> Create separate domain lists for control and monitor operations.
Please do note that an upcoming change changes the domain list locking.
I expect the transition to go smoothly with the locking and list type
translating to both lists so just sharing for your information in case you
are now aware:
https://lore.kernel.org/lkml/20231025180345.28061-25-james.morse@arm.com/
>
> Note that errors during initialization of either control or monitor
> functions on a domain would previously result in that domain being
> excluded from both control and monitor operations. Now the domains are
> allocated independently it is no longer required to disable both control
> and monitor operations if either fail.
>
> Signed-off-by: Tony Luck <tony.luck@intel.com>
> ---
...
> @@ -356,7 +359,7 @@ struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
> {
> struct rdt_domain *d;
>
> - list_for_each_entry(d, &r->domains, hdr.list) {
> + list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
> /* Find the domain that contains this CPU */
> if (cpumask_test_cpu(cpu, &d->cpu_mask))
> return d;
This appears to silently turn a generic "get_domain_from_cpu()" into
code that assumes control domain. This works for now for the existing
users but can trip up future changes. I think this would be better
renamed to get_ctrl_domain_from_cpu() or something better.
> @@ -388,29 +391,39 @@ void rdt_ctrl_update(void *arg)
> }
>
> /*
> - * rdt_find_domain - Find a domain in a resource that matches input resource id
> + * rdt_find_domain - Find a domain in one of a resource domain lists.
The above does not sound right.
"one of a resource domain lists" -> "a resource domain list" or "one of the resource
domain lists" or ?
> *
> - * Search resource r's domain list to find the resource id. If the resource
> - * id is found in a domain, return the domain. Otherwise, if requested by
> - * caller, return the first domain whose id is bigger than the input id.
> + * Search the list to find the resource id. If the resource id is found
> + * in a domain, return the domain. Otherwise, if requested by caller,
> + * return the first domain whose id is bigger than the input id.
The above does not sound right. First there is "Search the list to find
the resource id." The resource id is not involved in this code, do you
mean "domain id"? Also later "If the resource id is found in a domain,"
what does that mean here?
> * The domain list is sorted by id in ascending order.
> + *
> + * If an existing domain in the resource r's domain list matches the cpu's
> + * resource id, add the cpu in the domain.
domain id?
> + *
> + * Otherwise, caller will allocate a new domain and insert into the right position
> + * in the domain list sorted by id in ascending order.
> + *
> + * The order in the domain list is visible to users when we print entries
> + * in the schemata file and schemata input is validated to have the same order
> + * as this list.
Please document what the caller does at the caller. Also, please always use "CPU",
not "cpu". Finally, please do not impersonate code (no "we"). I understand you
are copying original comments, no need to propagate these issues.
> */
> -struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
> - struct list_head **pos)
> +struct rdt_domain_hdr *rdt_find_domain(struct list_head *h, int id,
> + struct list_head **pos)
> {
> - struct rdt_domain *d;
> + struct rdt_domain_hdr *d;
> struct list_head *l;
>
> if (id < 0)
> return ERR_PTR(-ENODEV);
>
> - list_for_each(l, &r->domains) {
> - d = list_entry(l, struct rdt_domain, hdr.list);
> + list_for_each(l, h) {
> + d = list_entry(l, struct rdt_domain_hdr, list);
> /* When id is found, return its domain. */
> - if (id == d->hdr.id)
> + if (id == d->id)
> return d;
> /* Stop searching when finding id's position in sorted list. */
> - if (id < d->hdr.id)
> + if (id < d->id)
> break;
> }
>
> @@ -504,39 +517,33 @@ static int get_domain_id_from_scope(int cpu, enum resctrl_scope scope)
> return -EINVAL;
> }
>
> -/*
> - * domain_add_cpu - Add a cpu to a resource's domain list.
> - *
> - * If an existing domain in the resource r's domain list matches the cpu's
> - * resource id, add the cpu in the domain.
> - *
> - * Otherwise, a new domain is allocated and inserted into the right position
> - * in the domain list sorted by id in ascending order.
> - *
> - * The order in the domain list is visible to users when we print entries
> - * in the schemata file and schemata input is validated to have the same order
> - * as this list.
> - */
> -static void domain_add_cpu(int cpu, struct rdt_resource *r)
> +static void domain_add_cpu_ctrl(int cpu, struct rdt_resource *r)
> {
> - int id = get_domain_id_from_scope(cpu, r->scope);
> + int id = get_domain_id_from_scope(cpu, r->ctrl_scope);
> struct list_head *add_pos = NULL;
> struct rdt_hw_domain *hw_dom;
> + struct rdt_domain_hdr *hdr;
> struct rdt_domain *d;
> int err;
>
> if (id < 0) {
> - pr_warn_once("Can't find domain id for CPU:%d scope:%d for resource %s\n",
> - cpu, r->scope, r->name);
> + pr_warn_once("Can't find control domain id for CPU:%d scope:%d for resource %s\n",
> + cpu, r->ctrl_scope, r->name);
> return;
> }
> - d = rdt_find_domain(r, id, &add_pos);
> - if (IS_ERR(d)) {
> - pr_warn("Couldn't find cache id for CPU %d\n", cpu);
> +
> + hdr = rdt_find_domain(&r->ctrl_domains, id, &add_pos);
> + if (IS_ERR(hdr)) {
> + pr_warn("Couldn't find control scope id=%d for CPU %d\n", id, cpu);
How can the failure in the error message be encountered at this point?
> return;
> }
>
> - if (d) {
> + if (hdr) {
> + if (WARN_ON_ONCE(hdr->type != RESCTRL_CTRL_DOMAIN))
> + return;
> +
> + d = container_of(hdr, struct rdt_domain, hdr);
> +
> cpumask_set_cpu(cpu, &d->cpu_mask);
> if (r->cache.arch_has_per_cpu_cfg)
> rdt_domain_reconfigure_cdp(r);
> @@ -549,48 +556,115 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
>
> d = &hw_dom->d_resctrl;
> d->hdr.id = id;
> + d->hdr.type = RESCTRL_CTRL_DOMAIN;
> cpumask_set_cpu(cpu, &d->cpu_mask);
>
> rdt_domain_reconfigure_cdp(r);
>
> - if (r->alloc_capable && domain_setup_ctrlval(r, d)) {
> + if (domain_setup_ctrlval(r, d)) {
> + domain_free(hw_dom);
> + return;
> + }
> +
> + list_add_tail(&d->hdr.list, add_pos);
> +
> + err = resctrl_online_ctrl_domain(r, d);
> + if (err) {
> + list_del(&d->hdr.list);
> domain_free(hw_dom);
> + }
> +}
> +
> +static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
> +{
> + int id = get_domain_id_from_scope(cpu, r->mon_scope);
> + struct list_head *add_pos = NULL;
> + struct rdt_hw_domain *hw_dom;
> + struct rdt_domain_hdr *hdr;
> + struct rdt_domain *d;
> + int err;
> +
> + if (id < 0) {
> + pr_warn_once("Can't find monitor domain id for CPU:%d scope:%d for resource %s\n",
> + cpu, r->mon_scope, r->name);
> + return;
> + }
> +
> + hdr = rdt_find_domain(&r->mon_domains, id, &add_pos);
> + if (IS_ERR(hdr)) {
> + pr_warn("Couldn't find monitor scope id=%d for CPU %d\n", id, cpu);
> + return;
> + }
> +
> + if (hdr) {
> + if (WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN))
> + return;
> +
> + d = container_of(hdr, struct rdt_domain, hdr);
> +
> + cpumask_set_cpu(cpu, &d->cpu_mask);
> return;
> }
>
> - if (r->mon_capable && arch_domain_mbm_alloc(r->num_rmid, hw_dom)) {
> + hw_dom = kzalloc_node(sizeof(*hw_dom), GFP_KERNEL, cpu_to_node(cpu));
> + if (!hw_dom)
> + return;
> +
> + d = &hw_dom->d_resctrl;
> + d->hdr.id = id;
> + d->hdr.type = RESCTRL_MON_DOMAIN;
> + cpumask_set_cpu(cpu, &d->cpu_mask);
> +
> + if (arch_domain_mbm_alloc(r->num_rmid, hw_dom)) {
> domain_free(hw_dom);
> return;
> }
>
> list_add_tail(&d->hdr.list, add_pos);
>
> - err = resctrl_online_domain(r, d);
> + err = resctrl_online_mon_domain(r, d);
> if (err) {
> list_del(&d->hdr.list);
> domain_free(hw_dom);
> }
> }
>
> -static void domain_remove_cpu(int cpu, struct rdt_resource *r)
> +/*
> + * domain_add_cpu - Add a cpu to either/both resource's domain lists.
cpu -> CPU (please check all changelog and comments)
> + */
> +static void domain_add_cpu(int cpu, struct rdt_resource *r)
> +{
> + if (r->alloc_capable)
> + domain_add_cpu_ctrl(cpu, r);
> + if (r->mon_capable)
> + domain_add_cpu_mon(cpu, r);
> +}
> +
> @@ -3914,18 +3916,22 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
> return 0;
> }
>
> -int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d)
> +int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d)
> {
> - int err;
> -
> lockdep_assert_held(&rdtgroup_mutex);
>
> if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA)
> /* RDT_RESOURCE_MBA is never mon_capable */
This comment was used to justify the early exit based on later
"if (!r->mon_capable)" test. With the test removed this comment
becomes unnecessary.
Reinette
@@ -170,10 +170,12 @@ enum resctrl_scope {
* @alloc_capable: Is allocation available on this machine
* @mon_capable: Is monitor feature available on this machine
* @num_rmid: Number of RMIDs available
- * @scope: Scope of this resource
+ * @ctrl_scope: Scope of this resource for control functions
+ * @mon_scope: Scope of this resource for monitor functions
* @cache: Cache allocation related data
* @membw: If the component has bandwidth controls, their properties.
- * @domains: All domains for this resource
+ * @ctrl_domains: Control domains for this resource
+ * @mon_domains: Monitor domains for this resource
* @name: Name to use in "schemata" file.
* @data_width: Character width of data when displaying
* @default_ctrl: Specifies default cache cbm or memory B/W percent.
@@ -188,10 +190,12 @@ struct rdt_resource {
bool alloc_capable;
bool mon_capable;
int num_rmid;
- enum resctrl_scope scope;
+ enum resctrl_scope ctrl_scope;
+ enum resctrl_scope mon_scope;
struct resctrl_cache cache;
struct resctrl_membw membw;
- struct list_head domains;
+ struct list_head ctrl_domains;
+ struct list_head mon_domains;
char *name;
int data_width;
u32 default_ctrl;
@@ -237,8 +241,10 @@ int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
u32 closid, enum resctrl_conf_type type);
-int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d);
-void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d);
+int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d);
+int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_domain *d);
+void resctrl_offline_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d);
+void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_domain *d);
/**
* resctrl_arch_rmid_read() - Read the eventid counter corresponding to rmid
@@ -520,8 +520,8 @@ void rdtgroup_kn_unlock(struct kernfs_node *kn);
int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name);
int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
umode_t mask);
-struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
- struct list_head **pos);
+struct rdt_domain_hdr *rdt_find_domain(struct list_head *h, int id,
+ struct list_head **pos);
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,
@@ -57,7 +57,8 @@ static void
mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m,
struct rdt_resource *r);
-#define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.domains)
+#define ctrl_domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.ctrl_domains)
+#define mon_domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.mon_domains)
struct rdt_hw_resource rdt_resources_all[] = {
[RDT_RESOURCE_L3] =
@@ -65,8 +66,10 @@ struct rdt_hw_resource rdt_resources_all[] = {
.r_resctrl = {
.rid = RDT_RESOURCE_L3,
.name = "L3",
- .scope = RESCTRL_L3_CACHE,
- .domains = domain_init(RDT_RESOURCE_L3),
+ .ctrl_scope = RESCTRL_L3_CACHE,
+ .mon_scope = RESCTRL_L3_CACHE,
+ .ctrl_domains = ctrl_domain_init(RDT_RESOURCE_L3),
+ .mon_domains = mon_domain_init(RDT_RESOURCE_L3),
.parse_ctrlval = parse_cbm,
.format_str = "%d=%0*x",
.fflags = RFTYPE_RES_CACHE,
@@ -79,8 +82,8 @@ struct rdt_hw_resource rdt_resources_all[] = {
.r_resctrl = {
.rid = RDT_RESOURCE_L2,
.name = "L2",
- .scope = RESCTRL_L2_CACHE,
- .domains = domain_init(RDT_RESOURCE_L2),
+ .ctrl_scope = RESCTRL_L2_CACHE,
+ .ctrl_domains = ctrl_domain_init(RDT_RESOURCE_L2),
.parse_ctrlval = parse_cbm,
.format_str = "%d=%0*x",
.fflags = RFTYPE_RES_CACHE,
@@ -93,8 +96,8 @@ struct rdt_hw_resource rdt_resources_all[] = {
.r_resctrl = {
.rid = RDT_RESOURCE_MBA,
.name = "MB",
- .scope = RESCTRL_L3_CACHE,
- .domains = domain_init(RDT_RESOURCE_MBA),
+ .ctrl_scope = RESCTRL_L3_CACHE,
+ .ctrl_domains = ctrl_domain_init(RDT_RESOURCE_MBA),
.parse_ctrlval = parse_bw,
.format_str = "%d=%*u",
.fflags = RFTYPE_RES_MB,
@@ -105,8 +108,8 @@ struct rdt_hw_resource rdt_resources_all[] = {
.r_resctrl = {
.rid = RDT_RESOURCE_SMBA,
.name = "SMBA",
- .scope = RESCTRL_L3_CACHE,
- .domains = domain_init(RDT_RESOURCE_SMBA),
+ .ctrl_scope = RESCTRL_L3_CACHE,
+ .ctrl_domains = ctrl_domain_init(RDT_RESOURCE_SMBA),
.parse_ctrlval = parse_bw,
.format_str = "%d=%*u",
.fflags = RFTYPE_RES_MB,
@@ -356,7 +359,7 @@ struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
{
struct rdt_domain *d;
- list_for_each_entry(d, &r->domains, hdr.list) {
+ list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
/* Find the domain that contains this CPU */
if (cpumask_test_cpu(cpu, &d->cpu_mask))
return d;
@@ -388,29 +391,39 @@ void rdt_ctrl_update(void *arg)
}
/*
- * rdt_find_domain - Find a domain in a resource that matches input resource id
+ * rdt_find_domain - Find a domain in one of a resource domain lists.
*
- * Search resource r's domain list to find the resource id. If the resource
- * id is found in a domain, return the domain. Otherwise, if requested by
- * caller, return the first domain whose id is bigger than the input id.
+ * Search the list to find the resource id. If the resource id is found
+ * in a domain, return the domain. Otherwise, if requested by caller,
+ * return the first domain whose id is bigger than the input id.
* The domain list is sorted by id in ascending order.
+ *
+ * If an existing domain in the resource r's domain list matches the cpu's
+ * resource id, add the cpu in the domain.
+ *
+ * Otherwise, caller will allocate a new domain and insert into the right position
+ * in the domain list sorted by id in ascending order.
+ *
+ * The order in the domain list is visible to users when we print entries
+ * in the schemata file and schemata input is validated to have the same order
+ * as this list.
*/
-struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
- struct list_head **pos)
+struct rdt_domain_hdr *rdt_find_domain(struct list_head *h, int id,
+ struct list_head **pos)
{
- struct rdt_domain *d;
+ struct rdt_domain_hdr *d;
struct list_head *l;
if (id < 0)
return ERR_PTR(-ENODEV);
- list_for_each(l, &r->domains) {
- d = list_entry(l, struct rdt_domain, hdr.list);
+ list_for_each(l, h) {
+ d = list_entry(l, struct rdt_domain_hdr, list);
/* When id is found, return its domain. */
- if (id == d->hdr.id)
+ if (id == d->id)
return d;
/* Stop searching when finding id's position in sorted list. */
- if (id < d->hdr.id)
+ if (id < d->id)
break;
}
@@ -504,39 +517,33 @@ static int get_domain_id_from_scope(int cpu, enum resctrl_scope scope)
return -EINVAL;
}
-/*
- * domain_add_cpu - Add a cpu to a resource's domain list.
- *
- * If an existing domain in the resource r's domain list matches the cpu's
- * resource id, add the cpu in the domain.
- *
- * Otherwise, a new domain is allocated and inserted into the right position
- * in the domain list sorted by id in ascending order.
- *
- * The order in the domain list is visible to users when we print entries
- * in the schemata file and schemata input is validated to have the same order
- * as this list.
- */
-static void domain_add_cpu(int cpu, struct rdt_resource *r)
+static void domain_add_cpu_ctrl(int cpu, struct rdt_resource *r)
{
- int id = get_domain_id_from_scope(cpu, r->scope);
+ int id = get_domain_id_from_scope(cpu, r->ctrl_scope);
struct list_head *add_pos = NULL;
struct rdt_hw_domain *hw_dom;
+ struct rdt_domain_hdr *hdr;
struct rdt_domain *d;
int err;
if (id < 0) {
- pr_warn_once("Can't find domain id for CPU:%d scope:%d for resource %s\n",
- cpu, r->scope, r->name);
+ pr_warn_once("Can't find control domain id for CPU:%d scope:%d for resource %s\n",
+ cpu, r->ctrl_scope, r->name);
return;
}
- d = rdt_find_domain(r, id, &add_pos);
- if (IS_ERR(d)) {
- pr_warn("Couldn't find cache id for CPU %d\n", cpu);
+
+ hdr = rdt_find_domain(&r->ctrl_domains, id, &add_pos);
+ if (IS_ERR(hdr)) {
+ pr_warn("Couldn't find control scope id=%d for CPU %d\n", id, cpu);
return;
}
- if (d) {
+ if (hdr) {
+ if (WARN_ON_ONCE(hdr->type != RESCTRL_CTRL_DOMAIN))
+ return;
+
+ d = container_of(hdr, struct rdt_domain, hdr);
+
cpumask_set_cpu(cpu, &d->cpu_mask);
if (r->cache.arch_has_per_cpu_cfg)
rdt_domain_reconfigure_cdp(r);
@@ -549,48 +556,115 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
d = &hw_dom->d_resctrl;
d->hdr.id = id;
+ d->hdr.type = RESCTRL_CTRL_DOMAIN;
cpumask_set_cpu(cpu, &d->cpu_mask);
rdt_domain_reconfigure_cdp(r);
- if (r->alloc_capable && domain_setup_ctrlval(r, d)) {
+ if (domain_setup_ctrlval(r, d)) {
+ domain_free(hw_dom);
+ return;
+ }
+
+ list_add_tail(&d->hdr.list, add_pos);
+
+ err = resctrl_online_ctrl_domain(r, d);
+ if (err) {
+ list_del(&d->hdr.list);
domain_free(hw_dom);
+ }
+}
+
+static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
+{
+ int id = get_domain_id_from_scope(cpu, r->mon_scope);
+ struct list_head *add_pos = NULL;
+ struct rdt_hw_domain *hw_dom;
+ struct rdt_domain_hdr *hdr;
+ struct rdt_domain *d;
+ int err;
+
+ if (id < 0) {
+ pr_warn_once("Can't find monitor domain id for CPU:%d scope:%d for resource %s\n",
+ cpu, r->mon_scope, r->name);
+ return;
+ }
+
+ hdr = rdt_find_domain(&r->mon_domains, id, &add_pos);
+ if (IS_ERR(hdr)) {
+ pr_warn("Couldn't find monitor scope id=%d for CPU %d\n", id, cpu);
+ return;
+ }
+
+ if (hdr) {
+ if (WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN))
+ return;
+
+ d = container_of(hdr, struct rdt_domain, hdr);
+
+ cpumask_set_cpu(cpu, &d->cpu_mask);
return;
}
- if (r->mon_capable && arch_domain_mbm_alloc(r->num_rmid, hw_dom)) {
+ hw_dom = kzalloc_node(sizeof(*hw_dom), GFP_KERNEL, cpu_to_node(cpu));
+ if (!hw_dom)
+ return;
+
+ d = &hw_dom->d_resctrl;
+ d->hdr.id = id;
+ d->hdr.type = RESCTRL_MON_DOMAIN;
+ cpumask_set_cpu(cpu, &d->cpu_mask);
+
+ if (arch_domain_mbm_alloc(r->num_rmid, hw_dom)) {
domain_free(hw_dom);
return;
}
list_add_tail(&d->hdr.list, add_pos);
- err = resctrl_online_domain(r, d);
+ err = resctrl_online_mon_domain(r, d);
if (err) {
list_del(&d->hdr.list);
domain_free(hw_dom);
}
}
-static void domain_remove_cpu(int cpu, struct rdt_resource *r)
+/*
+ * domain_add_cpu - Add a cpu to either/both resource's domain lists.
+ */
+static void domain_add_cpu(int cpu, struct rdt_resource *r)
+{
+ if (r->alloc_capable)
+ domain_add_cpu_ctrl(cpu, r);
+ if (r->mon_capable)
+ domain_add_cpu_mon(cpu, r);
+}
+
+static void domain_remove_cpu_ctrl(int cpu, struct rdt_resource *r)
{
- int id = get_domain_id_from_scope(cpu, r->scope);
+ int id = get_domain_id_from_scope(cpu, r->ctrl_scope);
struct rdt_hw_domain *hw_dom;
+ struct rdt_domain_hdr *hdr;
struct rdt_domain *d;
if (id < 0)
return;
- d = rdt_find_domain(r, id, NULL);
- if (IS_ERR_OR_NULL(d)) {
- pr_warn("Couldn't find cache id for CPU %d\n", cpu);
+ hdr = rdt_find_domain(&r->ctrl_domains, id, NULL);
+ if (IS_ERR_OR_NULL(hdr)) {
+ pr_warn("Couldn't find control scope id=%d for CPU %d\n", id, cpu);
return;
}
+
+ if (WARN_ON_ONCE(hdr->type != RESCTRL_CTRL_DOMAIN))
+ return;
+
+ d = container_of(hdr, struct rdt_domain, hdr);
hw_dom = resctrl_to_arch_dom(d);
cpumask_clear_cpu(cpu, &d->cpu_mask);
if (cpumask_empty(&d->cpu_mask)) {
- resctrl_offline_domain(r, d);
+ resctrl_offline_ctrl_domain(r, d);
list_del(&d->hdr.list);
/*
@@ -603,6 +677,38 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
return;
}
+}
+
+static void domain_remove_cpu_mon(int cpu, struct rdt_resource *r)
+{
+ int id = get_domain_id_from_scope(cpu, r->mon_scope);
+ struct rdt_hw_domain *hw_dom;
+ struct rdt_domain_hdr *hdr;
+ struct rdt_domain *d;
+
+ if (id < 0)
+ return;
+
+ hdr = rdt_find_domain(&r->mon_domains, id, NULL);
+ if (IS_ERR_OR_NULL(hdr)) {
+ pr_warn("Couldn't find scope id=%d for CPU %d\n", id, cpu);
+ return;
+ }
+
+ if (WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN))
+ return;
+
+ d = container_of(hdr, struct rdt_domain, hdr);
+ hw_dom = resctrl_to_arch_dom(d);
+
+ cpumask_clear_cpu(cpu, &d->cpu_mask);
+ if (cpumask_empty(&d->cpu_mask)) {
+ resctrl_offline_mon_domain(r, d);
+ list_del(&d->hdr.list);
+ domain_free(hw_dom);
+
+ return;
+ }
if (r == &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl) {
if (is_mbm_enabled() && cpu == d->mbm_work_cpu) {
@@ -617,6 +723,14 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
}
}
+static void domain_remove_cpu(int cpu, struct rdt_resource *r)
+{
+ if (r->alloc_capable)
+ domain_remove_cpu_ctrl(cpu, r);
+ if (r->mon_capable)
+ domain_remove_cpu_mon(cpu, r);
+}
+
static void clear_closid_rmid(int cpu)
{
struct resctrl_pqr_state *state = this_cpu_ptr(&pqr_state);
@@ -226,7 +226,7 @@ static int parse_line(char *line, struct resctrl_schema *s,
return -EINVAL;
}
dom = strim(dom);
- list_for_each_entry(d, &r->domains, hdr.list) {
+ list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
if (d->hdr.id == dom_id) {
data.buf = dom;
data.rdtgrp = rdtgrp;
@@ -318,7 +318,7 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
return -ENOMEM;
msr_param.res = NULL;
- list_for_each_entry(d, &r->domains, hdr.list) {
+ list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
hw_dom = resctrl_to_arch_dom(d);
for (t = 0; t < CDP_NUM_TYPES; t++) {
cfg = &hw_dom->d_resctrl.staged_config[t];
@@ -466,7 +466,7 @@ static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int clo
u32 ctrl_val;
seq_printf(s, "%*s:", max_name_width, schema->name);
- list_for_each_entry(dom, &r->domains, hdr.list) {
+ list_for_each_entry(dom, &r->ctrl_domains, hdr.list) {
if (sep)
seq_puts(s, ";");
@@ -542,6 +542,7 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
int rdtgroup_mondata_show(struct seq_file *m, void *arg)
{
struct kernfs_open_file *of = m->private;
+ struct rdt_domain_hdr *hdr;
u32 resid, evtid, domid;
struct rdtgroup *rdtgrp;
struct rdt_resource *r;
@@ -562,12 +563,19 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
evtid = md.u.evtid;
r = &rdt_resources_all[resid].r_resctrl;
- d = rdt_find_domain(r, domid, NULL);
- if (IS_ERR_OR_NULL(d)) {
+ hdr = rdt_find_domain(&r->mon_domains, domid, NULL);
+ if (IS_ERR_OR_NULL(hdr)) {
ret = -ENOENT;
goto out;
}
+ if (WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ d = container_of(hdr, struct rdt_domain, hdr);
+
mon_event_read(&rr, r, d, rdtgrp, evtid, false);
if (rr.err == -EIO)
@@ -340,7 +340,7 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
entry->busy = 0;
cpu = get_cpu();
- list_for_each_entry(d, &r->domains, hdr.list) {
+ list_for_each_entry(d, &r->mon_domains, hdr.list) {
if (cpumask_test_cpu(cpu, &d->cpu_mask)) {
err = resctrl_arch_rmid_read(r, d, entry->rmid,
QOS_L3_OCCUP_EVENT_ID,
@@ -292,7 +292,7 @@ static void pseudo_lock_region_clear(struct pseudo_lock_region *plr)
*/
static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
{
- int scope = plr->s->res->scope;
+ int scope = plr->s->res->ctrl_scope;
struct cpu_cacheinfo *ci;
int ret;
int i;
@@ -856,7 +856,7 @@ bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
* associated with them.
*/
for_each_alloc_capable_rdt_resource(r) {
- list_for_each_entry(d_i, &r->domains, hdr.list) {
+ list_for_each_entry(d_i, &r->ctrl_domains, hdr.list) {
if (d_i->plr)
cpumask_or(cpu_with_psl, cpu_with_psl,
&d_i->cpu_mask);
@@ -91,7 +91,7 @@ void rdt_staged_configs_clear(void)
lockdep_assert_held(&rdtgroup_mutex);
for_each_alloc_capable_rdt_resource(r) {
- list_for_each_entry(dom, &r->domains, hdr.list)
+ list_for_each_entry(dom, &r->ctrl_domains, hdr.list)
memset(dom->staged_config, 0, sizeof(dom->staged_config));
}
}
@@ -984,7 +984,7 @@ static int rdt_bit_usage_show(struct kernfs_open_file *of,
mutex_lock(&rdtgroup_mutex);
hw_shareable = r->cache.shareable_bits;
- list_for_each_entry(dom, &r->domains, hdr.list) {
+ list_for_each_entry(dom, &r->ctrl_domains, hdr.list) {
if (sep)
seq_putc(seq, ';');
sw_shareable = 0;
@@ -1302,7 +1302,7 @@ static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
if (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)
continue;
has_cache = true;
- list_for_each_entry(d, &r->domains, hdr.list) {
+ list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
ctrl = resctrl_arch_get_config(r, d, closid,
s->conf_type);
if (rdtgroup_cbm_overlaps(s, d, ctrl, closid, false)) {
@@ -1413,13 +1413,13 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
unsigned int size = 0;
int num_b, i;
- if (WARN_ON_ONCE(r->scope != RESCTRL_L2_CACHE && r->scope != RESCTRL_L3_CACHE))
+ if (WARN_ON_ONCE(r->ctrl_scope != RESCTRL_L2_CACHE && r->ctrl_scope != RESCTRL_L3_CACHE))
return size;
num_b = bitmap_weight(&cbm, r->cache.cbm_len);
ci = get_cpu_cacheinfo(cpumask_any(&d->cpu_mask));
for (i = 0; i < ci->num_leaves; i++) {
- if (ci->info_list[i].level == r->scope) {
+ if (ci->info_list[i].level == r->ctrl_scope) {
size = ci->info_list[i].size / r->cache.cbm_len * num_b;
break;
}
@@ -1477,7 +1477,7 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
type = schema->conf_type;
sep = false;
seq_printf(s, "%*s:", max_name_width, schema->name);
- list_for_each_entry(d, &r->domains, hdr.list) {
+ list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
if (sep)
seq_putc(s, ';');
if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
@@ -1566,7 +1566,7 @@ static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid
mutex_lock(&rdtgroup_mutex);
- list_for_each_entry(dom, &r->domains, hdr.list) {
+ list_for_each_entry(dom, &r->mon_domains, hdr.list) {
if (sep)
seq_puts(s, ";");
@@ -1689,7 +1689,7 @@ static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
return -EINVAL;
}
- list_for_each_entry(d, &r->domains, hdr.list) {
+ list_for_each_entry(d, &r->mon_domains, hdr.list) {
if (d->hdr.id == dom_id) {
ret = mbm_config_write_domain(r, d, evtid, val);
if (ret)
@@ -2232,7 +2232,7 @@ static int set_cache_qos_cfg(int level, bool enable)
return -ENOMEM;
r_l = &rdt_resources_all[level].r_resctrl;
- list_for_each_entry(d, &r_l->domains, hdr.list) {
+ list_for_each_entry(d, &r_l->ctrl_domains, hdr.list) {
if (r_l->cache.arch_has_per_cpu_cfg)
/* Pick all the CPUs in the domain instance */
for_each_cpu(cpu, &d->cpu_mask)
@@ -2317,7 +2317,7 @@ static int set_mba_sc(bool mba_sc)
r->membw.mba_sc = mba_sc;
- list_for_each_entry(d, &r->domains, hdr.list) {
+ list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
for (i = 0; i < num_closid; i++)
d->mbps_val[i] = MBA_MAX_MBPS;
}
@@ -2653,7 +2653,7 @@ static int rdt_get_tree(struct fs_context *fc)
if (is_mbm_enabled()) {
r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
- list_for_each_entry(dom, &r->domains, hdr.list)
+ list_for_each_entry(dom, &r->mon_domains, hdr.list)
mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL);
}
@@ -2777,10 +2777,10 @@ static int reset_all_ctrls(struct rdt_resource *r)
/*
* Disable resource control for this resource by setting all
- * CBMs in all domains to the maximum mask value. Pick one CPU
+ * CBMs in all ctrl_domains to the maximum mask value. Pick one CPU
* from each domain to update the MSRs below.
*/
- list_for_each_entry(d, &r->domains, hdr.list) {
+ list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
hw_dom = resctrl_to_arch_dom(d);
cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
@@ -3050,7 +3050,7 @@ static int mkdir_mondata_subdir_alldom(struct kernfs_node *parent_kn,
struct rdt_domain *dom;
int ret;
- list_for_each_entry(dom, &r->domains, hdr.list) {
+ list_for_each_entry(dom, &r->mon_domains, hdr.list) {
ret = mkdir_mondata_subdir(parent_kn, dom, r, prgrp);
if (ret)
return ret;
@@ -3232,7 +3232,7 @@ static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
struct rdt_domain *d;
int ret;
- list_for_each_entry(d, &s->res->domains, hdr.list) {
+ list_for_each_entry(d, &s->res->ctrl_domains, hdr.list) {
ret = __init_one_rdt_domain(d, s, closid);
if (ret < 0)
return ret;
@@ -3247,7 +3247,7 @@ static void rdtgroup_init_mba(struct rdt_resource *r, u32 closid)
struct resctrl_staged_config *cfg;
struct rdt_domain *d;
- list_for_each_entry(d, &r->domains, hdr.list) {
+ list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
if (is_mba_sc(r)) {
d->mbps_val[closid] = MBA_MAX_MBPS;
continue;
@@ -3849,15 +3849,17 @@ static void domain_destroy_mon_state(struct rdt_domain *d)
kfree(d->mbm_local);
}
-void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
+void resctrl_offline_ctrl_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;
+void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_domain *d)
+{
+ lockdep_assert_held(&rdtgroup_mutex);
/*
* If resctrl is mounted, remove all the
@@ -3914,18 +3916,22 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
return 0;
}
-int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d)
+int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d)
{
- int err;
-
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;
+ return 0;
+}
+
+int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_domain *d)
+{
+ int err;
+
+ lockdep_assert_held(&rdtgroup_mutex);
err = domain_setup_mon_state(r, d);
if (err)