From 874194123718e625aa96632bac457d686ba1378e Mon Sep 17 00:00:00 2001 From: Jack Steiner Date: Thu, 2 Apr 2009 16:59:08 -0700 Subject: 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/misc/sgi-gru/grufile.c | 1 + drivers/misc/sgi-gru/grumain.c | 13 +++++++++---- 2 files changed, 10 insertions(+), 4 deletions(-) (limited to 'drivers/misc/sgi-gru') diff --git a/drivers/misc/sgi-gru/grufile.c b/drivers/misc/sgi-gru/grufile.c index 812678d8b47..f8dcdb1a0ec 100644 --- a/drivers/misc/sgi-gru/grufile.c +++ b/drivers/misc/sgi-gru/grufile.c @@ -274,6 +274,7 @@ static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr, gru->gs_blade_id = bid; gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1; gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1; + gru->gs_asid_limit = MAX_ASID; gru_tgh_flush_init(gru); gru_dbg(grudev, "bid %d, nid %d, gid %d, vaddr %p (0x%lx)\n", bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr, diff --git a/drivers/misc/sgi-gru/grumain.c b/drivers/misc/sgi-gru/grumain.c index de60458f6d1..5fc7b5ecde6 100644 --- a/drivers/misc/sgi-gru/grumain.c +++ b/drivers/misc/sgi-gru/grumain.c @@ -79,7 +79,6 @@ static int gru_wrap_asid(struct gru_state *gru) gru_dbg(grudev, "gid %d\n", gru->gs_gid); STAT(asid_wrap); gru->gs_asid_gen++; - gru_flush_all_tlb(gru); return MIN_ASID; } @@ -93,6 +92,7 @@ static int gru_reset_asid_limit(struct gru_state *gru, int asid) limit = MAX_ASID; if (asid >= limit) asid = gru_wrap_asid(gru); + gru_flush_all_tlb(gru); gid = gru->gs_gid; again: for (i = 0; i < GRU_NUM_CCH; i++) { @@ -131,12 +131,10 @@ static int gru_assign_asid(struct gru_state *gru) { int asid; - spin_lock(&gru->gs_asid_lock); gru->gs_asid += ASID_INC; asid = gru->gs_asid; if (asid >= gru->gs_asid_limit) asid = gru_reset_asid_limit(gru, asid); - spin_unlock(&gru->gs_asid_lock); gru_dbg(grudev, "gid %d, asid 0x%x\n", gru->gs_gid, asid); return asid; @@ -227,7 +225,9 @@ static int gru_load_mm_tracker(struct gru_state *gru, spin_lock(&gms->ms_asid_lock); asid = asids->mt_asid; - if (asid == 0 || asids->mt_asid_gen != gru->gs_asid_gen) { + spin_lock(&gru->gs_asid_lock); + if (asid == 0 || (asids->mt_ctxbitmap == 0 && asids->mt_asid_gen != + gru->gs_asid_gen)) { asid = gru_assign_asid(gru); asids->mt_asid = asid; asids->mt_asid_gen = gru->gs_asid_gen; @@ -235,6 +235,7 @@ static int gru_load_mm_tracker(struct gru_state *gru, } else { STAT(asid_reuse); } + spin_unlock(&gru->gs_asid_lock); BUG_ON(asids->mt_ctxbitmap & ctxbitmap); asids->mt_ctxbitmap |= ctxbitmap; @@ -259,10 +260,12 @@ static void gru_unload_mm_tracker(struct gru_state *gru, asids = &gms->ms_asids[gru->gs_gid]; ctxbitmap = (1 << gts->ts_ctxnum); spin_lock(&gms->ms_asid_lock); + spin_lock(&gru->gs_asid_lock); BUG_ON((asids->mt_ctxbitmap & ctxbitmap) != ctxbitmap); asids->mt_ctxbitmap ^= ctxbitmap; gru_dbg(grudev, "gid %d, gts %p, gms %p, ctxnum 0x%d, asidmap 0x%lx\n", gru->gs_gid, gts, gms, gts->ts_ctxnum, gms->ms_asidmap[0]); + spin_unlock(&gru->gs_asid_lock); spin_unlock(&gms->ms_asid_lock); } @@ -412,6 +415,7 @@ static void gru_free_gru_context(struct gru_thread_state *gts) __clear_bit(gts->ts_ctxnum, &gru->gs_context_map); gts->ts_ctxnum = NULLCTX; gts->ts_gru = NULL; + gts->ts_blade = -1; spin_unlock(&gru->gs_lock); gts_drop(gts); @@ -731,6 +735,7 @@ again: } reserve_gru_resources(gru, gts); gts->ts_gru = gru; + gts->ts_blade = gru->gs_blade_id; gts->ts_ctxnum = find_first_zero_bit(&gru->gs_context_map, GRU_NUM_CCH); BUG_ON(gts->ts_ctxnum == GRU_NUM_CCH); -- cgit v1.2.3-70-g09d2