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Commit c793da8e authored by Reinette Chatre's avatar Reinette Chatre Committed by Thomas Gleixner
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x86/intel_rdt: Global closid helper to support future fixes 



The number of CLOSIDs supported by a system is the minimum number of
CLOSIDs supported by any of its resources. Care should be taken when
iterating over the CLOSIDs of a resource since it may be that the number
of CLOSIDs supported on the system is less than the number of CLOSIDs
supported by the resource.

Introduce a helper function that can be used to query the number of
CLOSIDs that is supported by all resources, irrespective of how many
CLOSIDs are supported by a particular resource.

Signed-off-by: default avatarReinette Chatre <reinette.chatre@intel.com>
Signed-off-by: default avatarFenghua Yu <fenghua.yu@intel.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: "H Peter Anvin" <hpa@zytor.com>
Cc: "Tony Luck" <tony.luck@intel.com>
Cc: "Xiaochen Shen" <xiaochen.shen@intel.com>
Cc: "Chen Yu" <yu.c.chen@intel.com>
Link: https://lkml.kernel.org/r/1537048707-76280-4-git-send-email-fenghua.yu@intel.com
parent f968dc11

arch/x86/kernel/cpu/intel_rdt.h

+1 −0
Original line number Diff line number Diff line
@@ -544,6 +544,7 @@ int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp); 
void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);

struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);

int update_domains(struct rdt_resource *r, int closid);

int closids_supported(void);

void closid_free(int closid);

int alloc_rmid(void);

void free_rmid(u32 rmid);

arch/x86/kernel/cpu/intel_rdt_rdtgroup.c

+7 −0
Original line number Diff line number Diff line
@@ -97,6 +97,12 @@ void rdt_last_cmd_printf(const char *fmt, ...) 
 *   limited as the number of resources grows.

 */

static int closid_free_map;

static int closid_free_map_len;



int closids_supported(void)

{

	return closid_free_map_len;

}



static void closid_init(void)

{
@@ -111,6 +117,7 @@ static void closid_init(void) 


	/* CLOSID 0 is always reserved for the default group */

	closid_free_map &= ~1;

	closid_free_map_len = rdt_min_closid;

}



static int closid_alloc(void)