xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

gru: fix prefetch and speculation bugs

Browse Source 
Fix several bugs related to prefetch, ordering & speculation:

	- GRU cch_allocate() instruction causes cacheable memory
	  to be created. Add a barriers to prevent speculation
	  from prefetching data before it exists.
	- Add memory barriers before cache-flush instructions to ensure
	  that previously stored data is included in the line flushed to memory.

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 16:48:11 -08:00
committed by Linus Torvalds
parent e006043a4d
commit 67bf04a5c2
5 changed files with 38 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/misc/sgi-gru/gruhandles.c
View File

@@ -91,9 +91,18 @@ static int wait_instruction_complete(void *h, enum mcs_op opc)
int cch_allocate(struct gru_context_configuration_handle *cch)
{
int ret;
cch->opc = CCHOP_ALLOCATE;
start_instruction(cch);
return wait_instruction_complete(cch, cchop_allocate);
ret = wait_instruction_complete(cch, cchop_allocate);
/*
* Stop speculation into the GSEG being mapped by the previous ALLOCATE.
* The GSEG memory does not exist until the ALLOCATE completes.
*/
sync_core();
return ret;
}
int cch_start(struct gru_context_configuration_handle *cch)
@@ -112,9 +121,18 @@ int cch_interrupt(struct gru_context_configuration_handle *cch)
int cch_deallocate(struct gru_context_configuration_handle *cch)
{
int ret;
cch->opc = CCHOP_DEALLOCATE;
start_instruction(cch);
return wait_instruction_complete(cch, cchop_deallocate);
ret = wait_instruction_complete(cch, cchop_deallocate);
/*
* Stop speculation into the GSEG being unmapped by the previous
* DEALLOCATE.
*/
sync_core();
return ret;
}
int cch_interrupt_sync(struct gru_context_configuration_handle