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x86/resctrl: Add a helper to read/set the CDP configuration

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Whether CDP is enabled for a hardware resource like the L3 cache can be
found by inspecting the alloc_enabled flags of the L3CODE/L3DATA struct
rdt_hw_resources, even if they aren't in use.

Once these resources are merged, the flags can't be compared. Whether
CDP is enabled needs tracking explicitly. If another architecture is
emulating CDP the behaviour may not be per-resource. 'cdp_capable' needs
to be visible to resctrl, even if its not in use, as this affects the
padding of the schemata table visible to user-space.

Add cdp_enabled to struct rdt_hw_resource and cdp_capable to struct
rdt_resource. Add resctrl_arch_set_cdp_enabled() to let resctrl enable
or disable CDP on a resource. resctrl_arch_get_cdp_enabled() lets it
read the current state.

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/20210728170637.25610-12-james.morse@arm.com
This commit is contained in:
James Morse
2021-07-28 17:06:24 +00:00
committed by Borislav Petkov
parent 32150edd3f
commit c091e90721
5 changed files with 62 additions and 35 deletions
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3
include/linux/resctrl.h
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@@ -142,6 +142,7 @@ struct resctrl_schema;
* @parse_ctrlval: Per resource function pointer to parse control values
* @evt_list: List of monitoring events
* @fflags: flags to choose base and info files
* @cdp_capable: Is the CDP feature available on this resource
*/
struct rdt_resource {
int rid;
@@ -163,7 +164,7 @@ struct rdt_resource {
struct rdt_domain *d);
struct list_head evt_list;
unsigned long fflags;
bool cdp_capable;
};
/**