gru: add user request to specify gru slice

Add a user request to specify the gru instruction slice parameter for user
contexts.

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>

drivers/misc/sgi-gru/grufault.c

@@ -769,6 +769,10 @@ int gru_set_context_option(unsigned long arg)
  		/* Register the current task as the GSEG owner */
 		gts->ts_tgid_owner = current->tgid;
 		break;
+	case sco_cch_req_slice:
+ 		/* Set the CCH slice option */
+		gts->ts_cch_req_slice = req.val1 & 3;
+		break;
 	default:
 		ret = -EINVAL;
 	}

drivers/misc/sgi-gru/grulib.h

@@ -98,7 +98,7 @@ struct gru_unload_context_req {
 /*
  * Structure used to set context options
  */
-enum {sco_gseg_owner};
+enum {sco_gseg_owner, sco_cch_req_slice};
 struct gru_set_context_option_req {
 	unsigned long	gseg;
 	int		op;

drivers/misc/sgi-gru/grumain.c

@@ -321,6 +321,7 @@ struct gru_thread_state *gru_alloc_gts(struct vm_area_struct *vma,
 	gts->ts_tsid = tsid;
 	gts->ts_ctxnum = NULLCTX;
 	gts->ts_tlb_int_select = -1;
+	gts->ts_cch_req_slice = -1;
 	gts->ts_sizeavail = GRU_SIZEAVAIL(PAGE_SHIFT);
 	if (vma) {
 		gts->ts_mm = current->mm;
@@ -566,6 +567,12 @@ void gru_load_context(struct gru_thread_state *gts)
 		gts->ts_tlb_int_select = gru_cpu_fault_map_id();
 		cch->tlb_int_select = gts->ts_tlb_int_select;
 	}
+	if (gts->ts_cch_req_slice >= 0) {
+		cch->req_slice_set_enable = 1;
+		cch->req_slice = gts->ts_cch_req_slice;
+	} else {
+		cch->req_slice_set_enable =0;
+	}
 	cch->tfm_done_bit_enable = 0;
 	cch->dsr_allocation_map = gts->ts_dsr_map;
 	cch->cbr_allocation_map = gts->ts_cbr_map;

drivers/misc/sgi-gru/grutables.h

@@ -380,6 +380,7 @@ struct gru_thread_state {
 						   required for contest */
 	unsigned char		ts_cbr_au_count;/* Number of CBR resources
 						   required for contest */
+	char			ts_cch_req_slice;/* CCH packet slice */
 	char			ts_blade;	/* If >= 0, migrate context if
 						   ref from diferent blade */
 	char			ts_force_cch_reload;