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powerpc/vas: Create cpu to vas id mapping 

Create a cpu to vasid mapping so callers can specify -1 instead of
trying to find a VAS id.

Changelog[v2]
	[Michael Ellerman] Use per-cpu variables to simplify code.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sukadev Bhattiprolu 2017-11-07 18:23:49 -08:00 committed by Michael Ellerman
parent 6fccac16c5
commit ca03258b6b
1 changed files with 13 additions and 1 deletions
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14
arch/powerpc/platforms/powernv/vas.c
View File

@ -18,15 +18,18 @@
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/of.h>
#include <asm/prom.h>
#include "vas.h"
static DEFINE_MUTEX(vas_mutex);
static LIST_HEAD(vas_instances);
static DEFINE_PER_CPU(int, cpu_vas_id);
static int init_vas_instance(struct platform_device *pdev)
{
int rc, vasid;
int rc, cpu, vasid;
struct resource *res;
struct vas_instance *vinst;
struct device_node *dn = pdev->dev.of_node;
@ -74,6 +77,11 @@ static int init_vas_instance(struct platform_device *pdev)
"paste_win_id_shift 0x%llx\n", pdev->name, vasid,
vinst->paste_base_addr, vinst->paste_win_id_shift);
for_each_possible_cpu(cpu) {
if (cpu_to_chip_id(cpu) == of_get_ibm_chip_id(dn))
per_cpu(cpu_vas_id, cpu) = vasid;
}
mutex_lock(&vas_mutex);
list_add(&vinst->node, &vas_instances);
mutex_unlock(&vas_mutex);
@ -98,6 +106,10 @@ struct vas_instance *find_vas_instance(int vasid)
struct vas_instance *vinst;
mutex_lock(&vas_mutex);
if (vasid == -1)
vasid = per_cpu(cpu_vas_id, smp_processor_id());
list_for_each(ent, &vas_instances) {
vinst = list_entry(ent, struct vas_instance, node);
if (vinst->vas_id == vasid) {