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    Subject[Patch 20/25] GRU - add gsh information to gru dumps
    From: Jack Steiner <steiner@sgi.com>

    Add support for dumpping the GRU GSH state. This provides addition debugging information
    for GRU failures.

    Add missing cache flush instructions. For performance reasons, the CBE does not
    alway maintain cache-coherency.

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

    ---
    drivers/misc/sgi-gru/grukdump.c | 17 ++++++++++++++++-
    drivers/misc/sgi-gru/grulib.h | 2 ++
    2 files changed, 18 insertions(+), 1 deletion(-)

    Index: linux/drivers/misc/sgi-gru/grukdump.c
    ===================================================================
    --- linux.orig/drivers/misc/sgi-gru/grukdump.c 2010-07-19 10:23:08.926244572 -0500
    +++ linux/drivers/misc/sgi-gru/grukdump.c 2010-07-19 13:10:56.766719840 -0500
    @@ -54,10 +54,16 @@ static int gru_dump_context_data(void *g
    cb = gseg + GRU_CB_BASE;
    cbe = grubase + GRU_CBE_BASE;
    tfh = grubase + GRU_TFH_BASE;
    + sync_core();
    + gru_flush_cache(cbe);

    for_each_cbr_in_allocation_map(i, &cch->cbr_allocation_map, scr) {
    - if (flush_cbrs)
    + if (flush_cbrs) {
    gru_flush_cache(cb);
    + gru_flush_cache(tfh + i * GRU_HANDLE_STRIDE);
    + }
    + gru_flush_cache(cbe + i * GRU_HANDLE_STRIDE);
    + sync_core();
    if (gru_user_copy_handle(&ubuf, cb))
    goto fail;
    if (gru_user_copy_handle(&ubuf, tfh + i * GRU_HANDLE_STRIDE))
    @@ -130,6 +136,7 @@ static int gru_dump_context(struct gru_s
    memset(&hdr, 0, sizeof(hdr));
    grubase = gru->gs_gru_base_vaddr;
    cch = get_cch(grubase, ctxnum);
    + gru_flush_cache(cch);
    for (try = 0; try < CCH_LOCK_ATTEMPTS; try++) {
    cch_locked = trylock_cch_handle(cch);
    if (cch_locked)
    @@ -184,6 +191,12 @@ fail:
    unlock_cch_handle(cch);
    return -EFAULT;
    }
    +static void dump_gsh_state(struct gru_state *gru,
    + struct gru_dump_chiplet_state_req *req)
    +{
    + memset(&req->gsh_cb_state, 0, sizeof(req->gsh_cb_state));
    + memset(&req->gsh_cch_state, 0, sizeof(req->gsh_cch_state));
    +}

    int gru_dump_chiplet_request(unsigned long arg)
    {
    @@ -214,6 +227,8 @@ int gru_dump_chiplet_request(unsigned lo
    goto fail;
    ubuf += ret;

    + dump_gsh_state(gru, &req);
    +
    for (ctxnum = 0; ctxnum < GRU_NUM_CCH; ctxnum++) {
    if (req.ctxnum == ctxnum || req.ctxnum < 0) {
    ret = gru_dump_context(gru, ctxnum, ubuf, ubufend,
    Index: linux/drivers/misc/sgi-gru/grulib.h
    ===================================================================
    --- linux.orig/drivers/misc/sgi-gru/grulib.h 2010-07-19 10:25:54.334243996 -0500
    +++ linux/drivers/misc/sgi-gru/grulib.h 2010-07-19 13:10:35.154917927 -0500
    @@ -130,6 +130,8 @@ struct gru_dump_chiplet_state_req {
    size_t buflen;
    /* ---- output --- */
    unsigned int num_contexts;
    + unsigned long gsh_cb_state[16];
    + unsigned long gsh_cch_state[16];
    };

    #define GRU_DUMP_MAGIC 0x3474ab6c


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