gru: add debug option for cache flushing
Add a debug option to the SGI GRU driver for flushing GRU cache lines from
memory. In theory this is not needed but it is useful for debugging.
This has no use by end users.
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>
diff --git a/drivers/misc/sgi-gru/grukdump.c b/drivers/misc/sgi-gru/grukdump.c
index 55eabfa..9b2062d 100644
--- a/drivers/misc/sgi-gru/grukdump.c
+++ b/drivers/misc/sgi-gru/grukdump.c
@@ -44,7 +44,8 @@
static int gru_dump_context_data(void *grubase,
struct gru_context_configuration_handle *cch,
- void __user *ubuf, int ctxnum, int dsrcnt)
+ void __user *ubuf, int ctxnum, int dsrcnt,
+ int flush_cbrs)
{
void *cb, *cbe, *tfh, *gseg;
int i, scr;
@@ -55,6 +56,8 @@
tfh = grubase + GRU_TFH_BASE;
for_each_cbr_in_allocation_map(i, &cch->cbr_allocation_map, scr) {
+ if (flush_cbrs)
+ gru_flush_cache(cb);
if (gru_user_copy_handle(&ubuf, cb))
goto fail;
if (gru_user_copy_handle(&ubuf, tfh + i * GRU_HANDLE_STRIDE))
@@ -115,7 +118,7 @@
static int gru_dump_context(struct gru_state *gru, int ctxnum,
void __user *ubuf, void __user *ubufend, char data_opt,
- char lock_cch)
+ char lock_cch, char flush_cbrs)
{
struct gru_dump_context_header hdr;
struct gru_dump_context_header __user *uhdr = ubuf;
@@ -159,8 +162,7 @@
ret = -EFBIG;
else
ret = gru_dump_context_data(grubase, cch, ubuf, ctxnum,
- dsrcnt);
-
+ dsrcnt, flush_cbrs);
}
if (cch_locked)
unlock_cch_handle(cch);
@@ -215,7 +217,8 @@
for (ctxnum = 0; ctxnum < GRU_NUM_CCH; ctxnum++) {
if (req.ctxnum == ctxnum || req.ctxnum < 0) {
ret = gru_dump_context(gru, ctxnum, ubuf, ubufend,
- req.data_opt, req.lock_cch);
+ req.data_opt, req.lock_cch,
+ req.flush_cbrs);
if (ret < 0)
goto fail;
ubuf += ret;
diff --git a/drivers/misc/sgi-gru/grulib.h b/drivers/misc/sgi-gru/grulib.h
index e94ee2b..e033b36 100644
--- a/drivers/misc/sgi-gru/grulib.h
+++ b/drivers/misc/sgi-gru/grulib.h
@@ -125,6 +125,8 @@
int ctxnum;
char data_opt;
char lock_cch;
+ char flush_cbrs;
+ char fill[10];
pid_t pid;
void *buf;
size_t buflen;