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    Subject[Patch 13/29] GRU - Add test for gru_copy_gpa
    From: Jack Steiner <steiner@sgi.com>

    Improve existing driver self-tests. Add a new debugging test to the SGI GRU driver
    for verifying the global GRU copy function.

    Signed-off-by: Jack Steiner <steiner@sgi.com>

    ---
    drivers/misc/sgi-gru/grukservices.c | 48 +++++++++++++++++++++++++++++-------
    1 file changed, 39 insertions(+), 9 deletions(-)

    Index: linux/drivers/misc/sgi-gru/grukservices.c
    ===================================================================
    --- linux.orig/drivers/misc/sgi-gru/grukservices.c 2009-11-20 09:32:29.000000000 -0600
    +++ linux/drivers/misc/sgi-gru/grukservices.c 2009-11-20 09:32:32.000000000 -0600
    @@ -1004,6 +1004,7 @@ static int quicktest2(unsigned long arg)
    int ret = 0;
    unsigned long *buf;
    void *cb0, *cb;
    + struct gru_control_block_status *gen;
    int i, k, istatus, bytes;

    bytes = numcb * 4 * 8;
    @@ -1023,20 +1024,30 @@ static int quicktest2(unsigned long arg)
    XTYPE_DW, 4, 1, IMA_INTERRUPT);

    ret = 0;
    - for (k = 0; k < numcb; k++) {
    + k = numcb;
    + do {
    gru_wait_async_cbr(han);
    for (i = 0; i < numcb; i++) {
    cb = cb0 + i * GRU_HANDLE_STRIDE;
    istatus = gru_check_status(cb);
    - if (istatus == CBS_ACTIVE)
    - continue;
    - if (istatus == CBS_EXCEPTION)
    - ret = -EFAULT;
    - else if (buf[i] || buf[i + 1] || buf[i + 2] ||
    - buf[i + 3])
    - ret = -EIO;
    + if (istatus != CBS_ACTIVE && istatus != CBS_CALL_OS)
    + break;
    }
    - }
    + if (i == numcb)
    + continue;
    + if (istatus != CBS_IDLE) {
    + printk(KERN_DEBUG "GRU:%d quicktest2: cb %d, exception\n", smp_processor_id(), i);
    + ret = -EFAULT;
    + } else if (buf[4 * i] || buf[4 * i + 1] || buf[4 * i + 2] ||
    + buf[4 * i + 3]) {
    + printk(KERN_DEBUG "GRU:%d quicktest2:cb %d, buf 0x%lx, 0x%lx, 0x%lx, 0x%lx\n",
    + smp_processor_id(), i, buf[4 * i], buf[4 * i + 1], buf[4 * i + 2], buf[4 * i + 3]);
    + ret = -EIO;
    + }
    + k--;
    + gen = cb;
    + gen->istatus = CBS_CALL_OS; /* don't handle this CBR again */
    + } while (k);
    BUG_ON(cmp.done);

    gru_unlock_async_resource(han);
    @@ -1046,6 +1057,22 @@ done:
    return ret;
    }

    +#define BUFSIZE 200
    +static int quicktest3(unsigned long arg)
    +{
    + char buf1[BUFSIZE], buf2[BUFSIZE];
    + int ret = 0;
    +
    + memset(buf2, 0, sizeof(buf2));
    + memset(buf1, get_cycles() & 255, sizeof(buf1));
    + gru_copy_gpa(uv_gpa(buf2), uv_gpa(buf1), BUFSIZE);
    + if (memcmp(buf1, buf2, BUFSIZE)) {
    + printk(KERN_DEBUG "GRU quicktest3 error\n");
    + ret = -EIO;
    + }
    + return ret;
    +}
    +
    /*
    * Debugging only. User hook for various kernel tests
    * of driver & gru.
    @@ -1064,6 +1091,9 @@ int gru_ktest(unsigned long arg)
    case 2:
    ret = quicktest2(arg);
    break;
    + case 3:
    + ret = quicktest3(arg);
    + break;
    case 99:
    ret = gru_free_kernel_contexts();
    break;


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