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    Subject[PATCH v2 09/18] powerpc/vas: Create cpu to vas id mapping
    Date
    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>
    ---
    arch/powerpc/platforms/powernv/vas.c | 14 +++++++++++++-
    1 file changed, 13 insertions(+), 1 deletion(-)

    diff --git a/arch/powerpc/platforms/powernv/vas.c b/arch/powerpc/platforms/powernv/vas.c
    index 565a487..abb7090 100644
    --- a/arch/powerpc/platforms/powernv/vas.c
    +++ b/arch/powerpc/platforms/powernv/vas.c
    @@ -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) {
    --
    2.7.4
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