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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>
This commit is contained in:
Jack Steiner 2009-12-15 16:48:09 -08:00 committed by Linus Torvalds
parent 7f2251b1bc
commit b8229bedd1
2 changed files with 10 additions and 5 deletions
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13
drivers/misc/sgi-gru/grukdump.c
View File

@ -44,7 +44,8 @@ static int gru_user_copy_handle(void __user **dp, void *s)
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 @@ static int gru_dump_context_data(void *grubase,
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 @@ fail:
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 @@ static int gru_dump_context(struct gru_state *gru, int ctxnum,
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 @@ int gru_dump_chiplet_request(unsigned long arg)
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;

2
drivers/misc/sgi-gru/grulib.h
View File

@ -125,6 +125,8 @@ struct gru_dump_chiplet_state_req {
int ctxnum;
char data_opt;
char lock_cch;
char flush_cbrs;
char fill[10];
pid_t pid;
void *buf;
size_t buflen;