sgi-gru: aSID (context management) bug fixes
This patch fixes bugs related to ASID (context id) management in the GRU driver. These changes are all internal to the SGI GRU driver and have no effect on the base kernel. Signed-off-by: Jack Steiner <steiner@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -274,6 +274,7 @@ static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
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gru->gs_blade_id = bid;
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gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
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gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
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gru->gs_asid_limit = MAX_ASID;
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gru_tgh_flush_init(gru);
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gru_dbg(grudev, "bid %d, nid %d, gid %d, vaddr %p (0x%lx)\n",
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bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
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@ -79,7 +79,6 @@ static int gru_wrap_asid(struct gru_state *gru)
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gru_dbg(grudev, "gid %d\n", gru->gs_gid);
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STAT(asid_wrap);
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gru->gs_asid_gen++;
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gru_flush_all_tlb(gru);
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return MIN_ASID;
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}
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@ -93,6 +92,7 @@ static int gru_reset_asid_limit(struct gru_state *gru, int asid)
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limit = MAX_ASID;
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if (asid >= limit)
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asid = gru_wrap_asid(gru);
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gru_flush_all_tlb(gru);
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gid = gru->gs_gid;
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again:
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for (i = 0; i < GRU_NUM_CCH; i++) {
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@ -131,12 +131,10 @@ static int gru_assign_asid(struct gru_state *gru)
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{
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int asid;
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spin_lock(&gru->gs_asid_lock);
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gru->gs_asid += ASID_INC;
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asid = gru->gs_asid;
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if (asid >= gru->gs_asid_limit)
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asid = gru_reset_asid_limit(gru, asid);
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spin_unlock(&gru->gs_asid_lock);
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gru_dbg(grudev, "gid %d, asid 0x%x\n", gru->gs_gid, asid);
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return asid;
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@ -227,7 +225,9 @@ static int gru_load_mm_tracker(struct gru_state *gru,
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spin_lock(&gms->ms_asid_lock);
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asid = asids->mt_asid;
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if (asid == 0 || asids->mt_asid_gen != gru->gs_asid_gen) {
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spin_lock(&gru->gs_asid_lock);
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if (asid == 0 || (asids->mt_ctxbitmap == 0 && asids->mt_asid_gen !=
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gru->gs_asid_gen)) {
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asid = gru_assign_asid(gru);
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asids->mt_asid = asid;
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asids->mt_asid_gen = gru->gs_asid_gen;
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@ -235,6 +235,7 @@ static int gru_load_mm_tracker(struct gru_state *gru,
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} else {
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STAT(asid_reuse);
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}
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spin_unlock(&gru->gs_asid_lock);
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BUG_ON(asids->mt_ctxbitmap & ctxbitmap);
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asids->mt_ctxbitmap |= ctxbitmap;
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@ -259,10 +260,12 @@ static void gru_unload_mm_tracker(struct gru_state *gru,
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asids = &gms->ms_asids[gru->gs_gid];
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ctxbitmap = (1 << gts->ts_ctxnum);
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spin_lock(&gms->ms_asid_lock);
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spin_lock(&gru->gs_asid_lock);
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BUG_ON((asids->mt_ctxbitmap & ctxbitmap) != ctxbitmap);
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asids->mt_ctxbitmap ^= ctxbitmap;
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gru_dbg(grudev, "gid %d, gts %p, gms %p, ctxnum 0x%d, asidmap 0x%lx\n",
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gru->gs_gid, gts, gms, gts->ts_ctxnum, gms->ms_asidmap[0]);
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spin_unlock(&gru->gs_asid_lock);
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spin_unlock(&gms->ms_asid_lock);
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}
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@ -412,6 +415,7 @@ static void gru_free_gru_context(struct gru_thread_state *gts)
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__clear_bit(gts->ts_ctxnum, &gru->gs_context_map);
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gts->ts_ctxnum = NULLCTX;
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gts->ts_gru = NULL;
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gts->ts_blade = -1;
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spin_unlock(&gru->gs_lock);
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gts_drop(gts);
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@ -731,6 +735,7 @@ again:
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}
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reserve_gru_resources(gru, gts);
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gts->ts_gru = gru;
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gts->ts_blade = gru->gs_blade_id;
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gts->ts_ctxnum =
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find_first_zero_bit(&gru->gs_context_map, GRU_NUM_CCH);
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BUG_ON(gts->ts_ctxnum == GRU_NUM_CCH);
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