Tool/software: Linux

Dear team，

I run the GateMP example for long time.The example protect share memory using the GateMP between A15 and DSP，but sometime it can not protect.

I follow the linux code GateHWSpinlock.c.

In  GateHWSpinlock_start

---------------------------------------------------------------------

    /* Fall back to /dev/mem if hwspinlock_user driver is not supported */
    Mod->fd = open("/dev/hwspinlock", O_RDWR);
    if (Mod->fd < 0) {
        Mod->fd = open ("/dev/mem", O_RDWR | O_SYNC);
    }
    else {
        Mod->useHwlockDrv = true;
    }
-----------------------------------------------------------------

The /dev dictionary does not have spinclock device, use /dev/mem?

I see page 5421 of the spruhz7f.pdf.  It said "A spinlock should only be held with interrupts disabled."

But in function GateHWSpinlock_enter

---------------------------------------------------------------

IArg GateHWSpinlock_enter(GateHWSpinlock_Object *obj)
{
    volatile UInt32 *baseAddr = Mod->baseAddr;
    struct hwspinlock_user_lock data = {
        .id = obj->lockNum,
        .timeout = 10,
    };
    IArg key;
    Bool locked;

    key = IGateProvider_enter(obj->localGate);

    /* if gate already entered, just return with current key */
    obj->nested++;
    if (obj->nested > 1) {
        return(key);
    }

    /* enter the spinlock */
    while (1) {
        if (Mod->useHwlockDrv) {
            locked = !ioctl(Mod->fd, HWSPINLOCK_USER_LOCK, &data);
        }
        else {
            /* read the spinlock, returns non-zero when we get it */
            locked = (baseAddr[obj->lockNum] == 0);
        }

        if (locked) {
            break;
        }

        obj->nested--;
        IGateProvider_leave(obj->localGate, key);
        key = IGateProvider_enter(obj->localGate);
        obj->nested++; /* re-nest the gate */
    }

    return (key);
}


---------------------------------------------------------------

The function IGateProvider_enter use the pthread_mutex_lock.

I am not find the operation to  disable  interrupt.

Does the code really make sure the hwspinlock work properly?

Here is my error log.

--> main:
CMEM_init success
--> Main_main:
--> GateMPApp_create:
GateMPApp_create: Host is ready
<-- GateMPApp_create:
--> GateMPApp_exec:
GateMPApp_exec: Using host-created gate
GateMPApp_exec: Using slave-created gate
GateMPApp_exec: unexpected variable value.Test failed.
GateMPApp_exec: Previous value: 518, c[ 3647.514352] omap_hwmod: mmu1_dsp1: _wait_target_disable failed
urrent value=1
<-- GateMPApp_exec: -268435456
<-- Main_main:
[ 3647.527235] omap_hwmod: mmu0_dsp1: _wait_target_disable failed
<-- main: