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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>
This commit is contained in:
Jack Steiner 2009-04-02 16:59:08 -07:00 committed by Linus Torvalds
parent bb04aa78ec
commit 8741941237
2 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/misc/sgi-gru/grufile.c
View File

@ -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,

13
drivers/misc/sgi-gru/grumain.c
View File

@ -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);