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[PATCH v8 08/10] fs/resctrl: Modify rdt_parse_data to pass mode and CLOSID

Babu Moger posted 10 patches 6 months ago
There is a newer version of this series
[PATCH v8 08/10] fs/resctrl: Modify rdt_parse_data to pass mode and CLOSID
Posted by Babu Moger 6 months ago 
parse_cbm() and parse_bw() require mode and CLOSID to validate the Capacity
Bit Mask (CBM). It is passed via struct rdtgroup in struct rdt_parse_data.

The io_alloc feature also uses CBMs to indicate which portions of cache are
allocated for I/O traffic. The CBMs are provided by user space and need to
be validated the same as CBMs provided for general (CPU) cache allocation.
parse_cbm() cannot be used as-is since io_alloc does not have rdtgroup
context.

Pass the mode and CLOSID directly to parse_cbm() via struct rdt_parse_data
instead of through the rdtgroup struct to facilitate calling parse_cbm() to
verify the CBM of the io_alloc feature.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
v8: Rephrase of changelog.

v7: Rephrase of changelog.

v6: Changed the subject line to fs/resctrl.

v5: Resolved conflicts due to recent resctrl FS/ARCH code restructure.

v4: New patch to call parse_cbm() directly to avoid code duplication.
---
 fs/resctrl/ctrlmondata.c | 25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index edb9dd131eed..641094aac322 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -24,7 +24,8 @@
 #include "internal.h"
 
 struct rdt_parse_data {
-	struct rdtgroup		*rdtgrp;
+	u32			closid;
+	enum rdtgrp_mode	mode;
 	char			*buf;
 };
 
@@ -77,8 +78,8 @@ static int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
 		    struct rdt_ctrl_domain *d)
 {
 	struct resctrl_staged_config *cfg;
-	u32 closid = data->rdtgrp->closid;
 	struct rdt_resource *r = s->res;
+	u32 closid = data->closid;
 	u32 bw_val;
 
 	cfg = &d->staged_config[s->conf_type];
@@ -156,9 +157,10 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
 static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 		     struct rdt_ctrl_domain *d)
 {
-	struct rdtgroup *rdtgrp = data->rdtgrp;
+	enum rdtgrp_mode mode = data->mode;
 	struct resctrl_staged_config *cfg;
 	struct rdt_resource *r = s->res;
+	u32 closid = data->closid;
 	u32 cbm_val;
 
 	cfg = &d->staged_config[s->conf_type];
@@ -171,7 +173,7 @@ static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 	 * Cannot set up more than one pseudo-locked region in a cache
 	 * hierarchy.
 	 */
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
+	if (mode == RDT_MODE_PSEUDO_LOCKSETUP &&
 	    rdtgroup_pseudo_locked_in_hierarchy(d)) {
 		rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
 		return -EINVAL;
@@ -180,8 +182,8 @@ static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 	if (!cbm_validate(data->buf, &cbm_val, r))
 		return -EINVAL;
 
-	if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
-	     rdtgrp->mode == RDT_MODE_SHAREABLE) &&
+	if ((mode == RDT_MODE_EXCLUSIVE ||
+	     mode == RDT_MODE_SHAREABLE) &&
 	    rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
 		rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
 		return -EINVAL;
@@ -191,14 +193,14 @@ static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 	 * The CBM may not overlap with the CBM of another closid if
 	 * either is exclusive.
 	 */
-	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, true)) {
+	if (rdtgroup_cbm_overlaps(s, d, cbm_val, closid, true)) {
 		rdt_last_cmd_puts("Overlaps with exclusive group\n");
 		return -EINVAL;
 	}
 
-	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, false)) {
-		if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
-		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+	if (rdtgroup_cbm_overlaps(s, d, cbm_val, closid, false)) {
+		if (mode == RDT_MODE_EXCLUSIVE ||
+		    mode == RDT_MODE_PSEUDO_LOCKSETUP) {
 			rdt_last_cmd_puts("Overlaps with other group\n");
 			return -EINVAL;
 		}
@@ -262,7 +264,8 @@ static int parse_line(char *line, struct resctrl_schema *s,
 	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
 		if (d->hdr.id == dom_id) {
 			data.buf = dom;
-			data.rdtgrp = rdtgrp;
+			data.closid = rdtgrp->closid;
+			data.mode = rdtgrp->mode;
 			if (parse_ctrlval(&data, s, d))
 				return -EINVAL;
 			if (rdtgrp->mode ==  RDT_MODE_PSEUDO_LOCKSETUP) {
-- 
2.34.1
Re: [PATCH v8 08/10] fs/resctrl: Modify rdt_parse_data to pass mode and CLOSID
Posted by Reinette Chatre 6 months ago 
Hi Babu,

On 8/5/25 4:30 PM, Babu Moger wrote:
> parse_cbm() and parse_bw() require mode and CLOSID to validate the Capacity

Again [1], parse_bw() does not validate any CBMs.

To be more specific: "mode" -> "resource group mode"?

> Bit Mask (CBM). It is passed via struct rdtgroup in struct rdt_parse_data.
> 
> The io_alloc feature also uses CBMs to indicate which portions of cache are
> allocated for I/O traffic. The CBMs are provided by user space and need to
> be validated the same as CBMs provided for general (CPU) cache allocation.
> parse_cbm() cannot be used as-is since io_alloc does not have rdtgroup
> context.
> 
> Pass the mode and CLOSID directly to parse_cbm() via struct rdt_parse_data
> instead of through the rdtgroup struct to facilitate calling parse_cbm() to
> verify the CBM of the io_alloc feature.
> 
> Signed-off-by: Babu Moger <babu.moger@amd.com>
> ---

...

> @@ -156,9 +157,10 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
>  static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
>  		     struct rdt_ctrl_domain *d)
>  {
> -	struct rdtgroup *rdtgrp = data->rdtgrp;
> +	enum rdtgrp_mode mode = data->mode;
>  	struct resctrl_staged_config *cfg;
>  	struct rdt_resource *r = s->res;
> +	u32 closid = data->closid;
>  	u32 cbm_val;
>  
>  	cfg = &d->staged_config[s->conf_type];
> @@ -171,7 +173,7 @@ static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
>  	 * Cannot set up more than one pseudo-locked region in a cache
>  	 * hierarchy.
>  	 */
> -	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
> +	if (mode == RDT_MODE_PSEUDO_LOCKSETUP &&
>  	    rdtgroup_pseudo_locked_in_hierarchy(d)) {
>  		rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
>  		return -EINVAL;
> @@ -180,8 +182,8 @@ static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
>  	if (!cbm_validate(data->buf, &cbm_val, r))
>  		return -EINVAL;
>  
> -	if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
> -	     rdtgrp->mode == RDT_MODE_SHAREABLE) &&
> +	if ((mode == RDT_MODE_EXCLUSIVE ||
> +	     mode == RDT_MODE_SHAREABLE) &&

This can now be on one line?

>  	    rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
>  		rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
>  		return -EINVAL;

Reinette

[1] https://lore.kernel.org/lkml/798ba4db-3ac2-44a9-9e0d-e9cbb0dbff45@intel.com/
Re: [PATCH v8 08/10] fs/resctrl: Modify rdt_parse_data to pass mode and CLOSID
Posted by Moger, Babu 5 months, 2 weeks ago 
Hi Reinette,

On 8/7/25 20:52, Reinette Chatre wrote:
> Hi Babu,
> 
> On 8/5/25 4:30 PM, Babu Moger wrote:
>> parse_cbm() and parse_bw() require mode and CLOSID to validate the Capacity
> 
> Again [1], parse_bw() does not validate any CBMs.

Removed parse_bw() reference.

> 
> To be more specific: "mode" -> "resource group mode"?

Sure.

> 
>> Bit Mask (CBM). It is passed via struct rdtgroup in struct rdt_parse_data.
>>
>> The io_alloc feature also uses CBMs to indicate which portions of cache are
>> allocated for I/O traffic. The CBMs are provided by user space and need to
>> be validated the same as CBMs provided for general (CPU) cache allocation.
>> parse_cbm() cannot be used as-is since io_alloc does not have rdtgroup
>> context.
>>
>> Pass the mode and CLOSID directly to parse_cbm() via struct rdt_parse_data
>> instead of through the rdtgroup struct to facilitate calling parse_cbm() to
>> verify the CBM of the io_alloc feature.
>>
>> Signed-off-by: Babu Moger <babu.moger@amd.com>
>> ---
> 
> ...
> 
>> @@ -156,9 +157,10 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
>>  static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
>>  		     struct rdt_ctrl_domain *d)
>>  {
>> -	struct rdtgroup *rdtgrp = data->rdtgrp;
>> +	enum rdtgrp_mode mode = data->mode;
>>  	struct resctrl_staged_config *cfg;
>>  	struct rdt_resource *r = s->res;
>> +	u32 closid = data->closid;
>>  	u32 cbm_val;
>>  
>>  	cfg = &d->staged_config[s->conf_type];
>> @@ -171,7 +173,7 @@ static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
>>  	 * Cannot set up more than one pseudo-locked region in a cache
>>  	 * hierarchy.
>>  	 */
>> -	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
>> +	if (mode == RDT_MODE_PSEUDO_LOCKSETUP &&
>>  	    rdtgroup_pseudo_locked_in_hierarchy(d)) {
>>  		rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
>>  		return -EINVAL;
>> @@ -180,8 +182,8 @@ static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
>>  	if (!cbm_validate(data->buf, &cbm_val, r))
>>  		return -EINVAL;
>>  
>> -	if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
>> -	     rdtgrp->mode == RDT_MODE_SHAREABLE) &&
>> +	if ((mode == RDT_MODE_EXCLUSIVE ||
>> +	     mode == RDT_MODE_SHAREABLE) &&
> 
> This can now be on one line?

Sure.

> 
>>  	    rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
>>  		rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
>>  		return -EINVAL;
> 
> Reinette
> 
> [1] https://lore.kernel.org/lkml/798ba4db-3ac2-44a9-9e0d-e9cbb0dbff45@intel.com/
> 

-- 
Thanks
Babu Moger

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