2 * SN Platform GRU Driver
4 * DRIVER TABLE MANAGER + GRU CONTEXT LOAD/UNLOAD
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
10 * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
16 #include <linux/spinlock.h>
17 #include <linux/sched.h>
18 #include <linux/device.h>
19 #include <linux/list.h>
20 #include <asm/uv/uv_hub.h>
22 #include "grutables.h"
23 #include "gruhandles.h"
25 unsigned long gru_options __read_mostly;
27 static struct device_driver gru_driver = {
31 static struct device gru_device = {
33 .driver = &gru_driver,
36 struct device *grudev = &gru_device;
39 * Select a gru fault map to be used by the current cpu. Note that
40 * multiple cpus may be using the same map.
41 * ZZZ should "shift" be used?? Depends on HT cpu numbering
42 * ZZZ should be inline but did not work on emulator
44 int gru_cpu_fault_map_id(void)
46 return uv_blade_processor_id() % GRU_NUM_TFM;
49 /*--------- ASID Management -------------------------------------------
51 * Initially, assign asids sequentially from MIN_ASID .. MAX_ASID.
52 * Once MAX is reached, flush the TLB & start over. However,
53 * some asids may still be in use. There won't be many (percentage wise) still
54 * in use. Search active contexts & determine the value of the first
55 * asid in use ("x"s below). Set "limit" to this value.
56 * This defines a block of assignable asids.
58 * When "limit" is reached, search forward from limit+1 and determine the
59 * next block of assignable asids.
61 * Repeat until MAX_ASID is reached, then start over again.
63 * Each time MAX_ASID is reached, increment the asid generation. Since
64 * the search for in-use asids only checks contexts with GRUs currently
65 * assigned, asids in some contexts will be missed. Prior to loading
66 * a context, the asid generation of the GTS asid is rechecked. If it
67 * doesn't match the current generation, a new asid will be assigned.
69 * 0---------------x------------x---------------------x----|
70 * ^-next ^-limit ^-MAX_ASID
72 * All asid manipulation & context loading/unloading is protected by the
76 /* Hit the asid limit. Start over */
77 static int gru_wrap_asid(struct gru_state *gru)
79 gru_dbg(grudev, "gid %d\n", gru->gs_gid);
82 gru_flush_all_tlb(gru);
86 /* Find the next chunk of unused asids */
87 static int gru_reset_asid_limit(struct gru_state *gru, int asid)
89 int i, gid, inuse_asid, limit;
91 gru_dbg(grudev, "gid %d, asid 0x%x\n", gru->gs_gid, asid);
95 asid = gru_wrap_asid(gru);
98 for (i = 0; i < GRU_NUM_CCH; i++) {
101 inuse_asid = gru->gs_gts[i]->ts_gms->ms_asids[gid].mt_asid;
102 gru_dbg(grudev, "gid %d, gts %p, gms %p, inuse 0x%x, cxt %d\n",
103 gru->gs_gid, gru->gs_gts[i], gru->gs_gts[i]->ts_gms,
105 if (inuse_asid == asid) {
109 * empty range: reset the range limit and
113 if (asid >= MAX_ASID)
114 asid = gru_wrap_asid(gru);
119 if ((inuse_asid > asid) && (inuse_asid < limit))
122 gru->gs_asid_limit = limit;
124 gru_dbg(grudev, "gid %d, new asid 0x%x, new_limit 0x%x\n", gru->gs_gid,
129 /* Assign a new ASID to a thread context. */
130 static int gru_assign_asid(struct gru_state *gru)
134 spin_lock(&gru->gs_asid_lock);
135 gru->gs_asid += ASID_INC;
137 if (asid >= gru->gs_asid_limit)
138 asid = gru_reset_asid_limit(gru, asid);
139 spin_unlock(&gru->gs_asid_lock);
141 gru_dbg(grudev, "gid %d, asid 0x%x\n", gru->gs_gid, asid);
146 * Clear n bits in a word. Return a word indicating the bits that were cleared.
147 * Optionally, build an array of chars that contain the bit numbers allocated.
149 static unsigned long reserve_resources(unsigned long *p, int n, int mmax,
152 unsigned long bits = 0;
156 i = find_first_bit(p, mmax);
167 unsigned long gru_reserve_cb_resources(struct gru_state *gru, int cbr_au_count,
170 return reserve_resources(&gru->gs_cbr_map, cbr_au_count, GRU_CBR_AU,
174 unsigned long gru_reserve_ds_resources(struct gru_state *gru, int dsr_au_count,
177 return reserve_resources(&gru->gs_dsr_map, dsr_au_count, GRU_DSR_AU,
181 static void reserve_gru_resources(struct gru_state *gru,
182 struct gru_thread_state *gts)
184 gru->gs_active_contexts++;
186 gru_reserve_cb_resources(gru, gts->ts_cbr_au_count,
189 gru_reserve_ds_resources(gru, gts->ts_dsr_au_count, NULL);
192 static void free_gru_resources(struct gru_state *gru,
193 struct gru_thread_state *gts)
195 gru->gs_active_contexts--;
196 gru->gs_cbr_map |= gts->ts_cbr_map;
197 gru->gs_dsr_map |= gts->ts_dsr_map;
201 * Check if a GRU has sufficient free resources to satisfy an allocation
202 * request. Note: GRU locks may or may not be held when this is called. If
203 * not held, recheck after acquiring the appropriate locks.
205 * Returns 1 if sufficient resources, 0 if not
207 static int check_gru_resources(struct gru_state *gru, int cbr_au_count,
208 int dsr_au_count, int max_active_contexts)
210 return hweight64(gru->gs_cbr_map) >= cbr_au_count
211 && hweight64(gru->gs_dsr_map) >= dsr_au_count
212 && gru->gs_active_contexts < max_active_contexts;
216 * TLB manangment requires tracking all GRU chiplets that have loaded a GSEG
219 static int gru_load_mm_tracker(struct gru_state *gru,
220 struct gru_thread_state *gts)
222 struct gru_mm_struct *gms = gts->ts_gms;
223 struct gru_mm_tracker *asids = &gms->ms_asids[gru->gs_gid];
224 unsigned short ctxbitmap = (1 << gts->ts_ctxnum);
227 spin_lock(&gms->ms_asid_lock);
228 asid = asids->mt_asid;
230 if (asid == 0 || asids->mt_asid_gen != gru->gs_asid_gen) {
231 asid = gru_assign_asid(gru);
232 asids->mt_asid = asid;
233 asids->mt_asid_gen = gru->gs_asid_gen;
239 BUG_ON(asids->mt_ctxbitmap & ctxbitmap);
240 asids->mt_ctxbitmap |= ctxbitmap;
241 if (!test_bit(gru->gs_gid, gms->ms_asidmap))
242 __set_bit(gru->gs_gid, gms->ms_asidmap);
243 spin_unlock(&gms->ms_asid_lock);
246 "gid %d, gts %p, gms %p, ctxnum %d, asid 0x%x, asidmap 0x%lx\n",
247 gru->gs_gid, gts, gms, gts->ts_ctxnum, asid,
252 static void gru_unload_mm_tracker(struct gru_state *gru,
253 struct gru_thread_state *gts)
255 struct gru_mm_struct *gms = gts->ts_gms;
256 struct gru_mm_tracker *asids;
257 unsigned short ctxbitmap;
259 asids = &gms->ms_asids[gru->gs_gid];
260 ctxbitmap = (1 << gts->ts_ctxnum);
261 spin_lock(&gms->ms_asid_lock);
262 BUG_ON((asids->mt_ctxbitmap & ctxbitmap) != ctxbitmap);
263 asids->mt_ctxbitmap ^= ctxbitmap;
264 gru_dbg(grudev, "gid %d, gts %p, gms %p, ctxnum 0x%d, asidmap 0x%lx\n",
265 gru->gs_gid, gts, gms, gts->ts_ctxnum, gms->ms_asidmap[0]);
266 spin_unlock(&gms->ms_asid_lock);
270 * Decrement the reference count on a GTS structure. Free the structure
271 * if the reference count goes to zero.
273 void gts_drop(struct gru_thread_state *gts)
275 if (gts && atomic_dec_return(>s->ts_refcnt) == 0) {
276 gru_drop_mmu_notifier(gts->ts_gms);
283 * Locate the GTS structure for the current thread.
285 static struct gru_thread_state *gru_find_current_gts_nolock(struct gru_vma_data
288 struct gru_thread_state *gts;
290 list_for_each_entry(gts, &vdata->vd_head, ts_next)
291 if (gts->ts_tsid == tsid)
297 * Allocate a thread state structure.
299 static struct gru_thread_state *gru_alloc_gts(struct vm_area_struct *vma,
300 struct gru_vma_data *vdata,
303 struct gru_thread_state *gts;
306 bytes = DSR_BYTES(vdata->vd_dsr_au_count) +
307 CBR_BYTES(vdata->vd_cbr_au_count);
308 bytes += sizeof(struct gru_thread_state);
309 gts = kzalloc(bytes, GFP_KERNEL);
314 atomic_set(>s->ts_refcnt, 1);
315 mutex_init(>s->ts_ctxlock);
316 gts->ts_cbr_au_count = vdata->vd_cbr_au_count;
317 gts->ts_dsr_au_count = vdata->vd_dsr_au_count;
318 gts->ts_user_options = vdata->vd_user_options;
320 gts->ts_user_options = vdata->vd_user_options;
321 gts->ts_ctxnum = NULLCTX;
322 gts->ts_mm = current->mm;
324 gts->ts_tlb_int_select = -1;
325 gts->ts_gms = gru_register_mmu_notifier();
329 gru_dbg(grudev, "alloc vdata %p, new gts %p\n", vdata, gts);
338 * Allocate a vma private data structure.
340 struct gru_vma_data *gru_alloc_vma_data(struct vm_area_struct *vma, int tsid)
342 struct gru_vma_data *vdata = NULL;
344 vdata = kmalloc(sizeof(*vdata), GFP_KERNEL);
348 INIT_LIST_HEAD(&vdata->vd_head);
349 spin_lock_init(&vdata->vd_lock);
350 gru_dbg(grudev, "alloc vdata %p\n", vdata);
355 * Find the thread state structure for the current thread.
357 struct gru_thread_state *gru_find_thread_state(struct vm_area_struct *vma,
360 struct gru_vma_data *vdata = vma->vm_private_data;
361 struct gru_thread_state *gts;
363 spin_lock(&vdata->vd_lock);
364 gts = gru_find_current_gts_nolock(vdata, tsid);
365 spin_unlock(&vdata->vd_lock);
366 gru_dbg(grudev, "vma %p, gts %p\n", vma, gts);
371 * Allocate a new thread state for a GSEG. Note that races may allow
372 * another thread to race to create a gts.
374 struct gru_thread_state *gru_alloc_thread_state(struct vm_area_struct *vma,
377 struct gru_vma_data *vdata = vma->vm_private_data;
378 struct gru_thread_state *gts, *ngts;
380 gts = gru_alloc_gts(vma, vdata, tsid);
384 spin_lock(&vdata->vd_lock);
385 ngts = gru_find_current_gts_nolock(vdata, tsid);
389 STAT(gts_double_allocate);
391 list_add(>s->ts_next, &vdata->vd_head);
393 spin_unlock(&vdata->vd_lock);
394 gru_dbg(grudev, "vma %p, gts %p\n", vma, gts);
399 * Free the GRU context assigned to the thread state.
401 static void gru_free_gru_context(struct gru_thread_state *gts)
403 struct gru_state *gru;
406 gru_dbg(grudev, "gts %p, gid %d\n", gts, gru->gs_gid);
408 spin_lock(&gru->gs_lock);
409 gru->gs_gts[gts->ts_ctxnum] = NULL;
410 free_gru_resources(gru, gts);
411 BUG_ON(test_bit(gts->ts_ctxnum, &gru->gs_context_map) == 0);
412 __clear_bit(gts->ts_ctxnum, &gru->gs_context_map);
413 gts->ts_ctxnum = NULLCTX;
415 spin_unlock(&gru->gs_lock);
422 * Prefetching cachelines help hardware performance.
423 * (Strictly a performance enhancement. Not functionally required).
425 static void prefetch_data(void *p, int num, int stride)
433 static inline long gru_copy_handle(void *d, void *s)
435 memcpy(d, s, GRU_HANDLE_BYTES);
436 return GRU_HANDLE_BYTES;
439 static void gru_prefetch_context(void *gseg, void *cb, void *cbe,
440 unsigned long cbrmap, unsigned long length)
444 prefetch_data(gseg + GRU_DS_BASE, length / GRU_CACHE_LINE_BYTES,
445 GRU_CACHE_LINE_BYTES);
447 for_each_cbr_in_allocation_map(i, &cbrmap, scr) {
448 prefetch_data(cb, 1, GRU_CACHE_LINE_BYTES);
449 prefetch_data(cbe + i * GRU_HANDLE_STRIDE, 1,
450 GRU_CACHE_LINE_BYTES);
451 cb += GRU_HANDLE_STRIDE;
455 static void gru_load_context_data(void *save, void *grubase, int ctxnum,
456 unsigned long cbrmap, unsigned long dsrmap)
458 void *gseg, *cb, *cbe;
459 unsigned long length;
462 gseg = grubase + ctxnum * GRU_GSEG_STRIDE;
463 cb = gseg + GRU_CB_BASE;
464 cbe = grubase + GRU_CBE_BASE;
465 length = hweight64(dsrmap) * GRU_DSR_AU_BYTES;
466 gru_prefetch_context(gseg, cb, cbe, cbrmap, length);
468 for_each_cbr_in_allocation_map(i, &cbrmap, scr) {
469 save += gru_copy_handle(cb, save);
470 save += gru_copy_handle(cbe + i * GRU_HANDLE_STRIDE, save);
471 cb += GRU_HANDLE_STRIDE;
474 memcpy(gseg + GRU_DS_BASE, save, length);
477 static void gru_unload_context_data(void *save, void *grubase, int ctxnum,
478 unsigned long cbrmap, unsigned long dsrmap)
480 void *gseg, *cb, *cbe;
481 unsigned long length;
484 gseg = grubase + ctxnum * GRU_GSEG_STRIDE;
485 cb = gseg + GRU_CB_BASE;
486 cbe = grubase + GRU_CBE_BASE;
487 length = hweight64(dsrmap) * GRU_DSR_AU_BYTES;
488 gru_prefetch_context(gseg, cb, cbe, cbrmap, length);
490 for_each_cbr_in_allocation_map(i, &cbrmap, scr) {
491 save += gru_copy_handle(save, cb);
492 save += gru_copy_handle(save, cbe + i * GRU_HANDLE_STRIDE);
493 cb += GRU_HANDLE_STRIDE;
495 memcpy(save, gseg + GRU_DS_BASE, length);
498 void gru_unload_context(struct gru_thread_state *gts, int savestate)
500 struct gru_state *gru = gts->ts_gru;
501 struct gru_context_configuration_handle *cch;
502 int ctxnum = gts->ts_ctxnum;
504 zap_vma_ptes(gts->ts_vma, UGRUADDR(gts), GRU_GSEG_PAGESIZE);
505 cch = get_cch(gru->gs_gru_base_vaddr, ctxnum);
507 gru_dbg(grudev, "gts %p\n", gts);
508 lock_cch_handle(cch);
509 if (cch_interrupt_sync(cch))
512 gru_unload_mm_tracker(gru, gts);
514 gru_unload_context_data(gts->ts_gdata, gru->gs_gru_base_vaddr,
515 ctxnum, gts->ts_cbr_map,
518 if (cch_deallocate(cch))
520 gts->ts_force_unload = 0; /* ts_force_unload locked by CCH lock */
521 unlock_cch_handle(cch);
523 gru_free_gru_context(gts);
524 STAT(unload_context);
528 * Load a GRU context by copying it from the thread data structure in memory
531 static void gru_load_context(struct gru_thread_state *gts)
533 struct gru_state *gru = gts->ts_gru;
534 struct gru_context_configuration_handle *cch;
535 int err, asid, ctxnum = gts->ts_ctxnum;
537 gru_dbg(grudev, "gts %p\n", gts);
538 cch = get_cch(gru->gs_gru_base_vaddr, ctxnum);
540 lock_cch_handle(cch);
541 asid = gru_load_mm_tracker(gru, gts);
542 cch->tfm_fault_bit_enable =
543 (gts->ts_user_options == GRU_OPT_MISS_FMM_POLL
544 || gts->ts_user_options == GRU_OPT_MISS_FMM_INTR);
545 cch->tlb_int_enable = (gts->ts_user_options == GRU_OPT_MISS_FMM_INTR);
546 if (cch->tlb_int_enable) {
547 gts->ts_tlb_int_select = gru_cpu_fault_map_id();
548 cch->tlb_int_select = gts->ts_tlb_int_select;
550 cch->tfm_done_bit_enable = 0;
551 err = cch_allocate(cch, asid, gts->ts_cbr_map, gts->ts_dsr_map);
554 "err %d: cch %p, gts %p, cbr 0x%lx, dsr 0x%lx\n",
555 err, cch, gts, gts->ts_cbr_map, gts->ts_dsr_map);
559 gru_load_context_data(gts->ts_gdata, gru->gs_gru_base_vaddr, ctxnum,
560 gts->ts_cbr_map, gts->ts_dsr_map);
564 unlock_cch_handle(cch);
570 * Update fields in an active CCH:
571 * - retarget interrupts on local blade
572 * - force a delayed context unload by clearing the CCH asids. This
573 * forces TLB misses for new GRU instructions. The context is unloaded
574 * when the next TLB miss occurs.
576 static int gru_update_cch(struct gru_thread_state *gts, int int_select)
578 struct gru_context_configuration_handle *cch;
579 struct gru_state *gru = gts->ts_gru;
580 int i, ctxnum = gts->ts_ctxnum, ret = 0;
582 cch = get_cch(gru->gs_gru_base_vaddr, ctxnum);
584 lock_cch_handle(cch);
585 if (cch->state == CCHSTATE_ACTIVE) {
586 if (gru->gs_gts[gts->ts_ctxnum] != gts)
588 if (cch_interrupt(cch))
590 if (int_select >= 0) {
591 gts->ts_tlb_int_select = int_select;
592 cch->tlb_int_select = int_select;
594 for (i = 0; i < 8; i++)
596 cch->tfm_fault_bit_enable = 0;
597 cch->tlb_int_enable = 0;
598 gts->ts_force_unload = 1;
605 unlock_cch_handle(cch);
610 * Update CCH tlb interrupt select. Required when all the following is true:
611 * - task's GRU context is loaded into a GRU
612 * - task is using interrupt notification for TLB faults
613 * - task has migrated to a different cpu on the same blade where
614 * it was previously running.
616 static int gru_retarget_intr(struct gru_thread_state *gts)
618 if (gts->ts_tlb_int_select < 0
619 || gts->ts_tlb_int_select == gru_cpu_fault_map_id())
622 gru_dbg(grudev, "retarget from %d to %d\n", gts->ts_tlb_int_select,
623 gru_cpu_fault_map_id());
624 return gru_update_cch(gts, gru_cpu_fault_map_id());
629 * Insufficient GRU resources available on the local blade. Steal a context from
630 * a process. This is a hack until a _real_ resource scheduler is written....
632 #define next_ctxnum(n) ((n) < GRU_NUM_CCH - 2 ? (n) + 1 : 0)
633 #define next_gru(b, g) (((g) < &(b)->bs_grus[GRU_CHIPLETS_PER_BLADE - 1]) ? \
634 ((g)+1) : &(b)->bs_grus[0])
636 static void gru_steal_context(struct gru_thread_state *gts)
638 struct gru_blade_state *blade;
639 struct gru_state *gru, *gru0;
640 struct gru_thread_state *ngts = NULL;
641 int ctxnum, ctxnum0, flag = 0, cbr, dsr;
643 cbr = gts->ts_cbr_au_count;
644 dsr = gts->ts_dsr_au_count;
647 blade = gru_base[uv_numa_blade_id()];
648 spin_lock(&blade->bs_lock);
650 ctxnum = next_ctxnum(blade->bs_lru_ctxnum);
651 gru = blade->bs_lru_gru;
653 gru = next_gru(blade, gru);
657 if (check_gru_resources(gru, cbr, dsr, GRU_NUM_CCH))
659 spin_lock(&gru->gs_lock);
660 for (; ctxnum < GRU_NUM_CCH; ctxnum++) {
661 if (flag && gru == gru0 && ctxnum == ctxnum0)
663 ngts = gru->gs_gts[ctxnum];
665 * We are grabbing locks out of order, so trylock is
666 * needed. GTSs are usually not locked, so the odds of
667 * success are high. If trylock fails, try to steal a
670 if (ngts && mutex_trylock(&ngts->ts_ctxlock))
675 spin_unlock(&gru->gs_lock);
676 if (ngts || (flag && gru == gru0 && ctxnum == ctxnum0))
679 gru = next_gru(blade, gru);
681 blade->bs_lru_gru = gru;
682 blade->bs_lru_ctxnum = ctxnum;
683 spin_unlock(&blade->bs_lock);
688 ngts->ts_steal_jiffies = jiffies;
689 gru_unload_context(ngts, 1);
690 mutex_unlock(&ngts->ts_ctxlock);
692 STAT(steal_context_failed);
695 "stole gid %d, ctxnum %d from gts %p. Need cb %d, ds %d;"
696 " avail cb %ld, ds %ld\n",
697 gru->gs_gid, ctxnum, ngts, cbr, dsr, hweight64(gru->gs_cbr_map),
698 hweight64(gru->gs_dsr_map));
702 * Scan the GRUs on the local blade & assign a GRU context.
704 static struct gru_state *gru_assign_gru_context(struct gru_thread_state *gts)
706 struct gru_state *gru, *grux;
707 int i, max_active_contexts;
713 max_active_contexts = GRU_NUM_CCH;
714 for_each_gru_on_blade(grux, uv_numa_blade_id(), i) {
715 if (check_gru_resources(grux, gts->ts_cbr_au_count,
716 gts->ts_dsr_au_count,
717 max_active_contexts)) {
719 max_active_contexts = grux->gs_active_contexts;
720 if (max_active_contexts == 0)
726 spin_lock(&gru->gs_lock);
727 if (!check_gru_resources(gru, gts->ts_cbr_au_count,
728 gts->ts_dsr_au_count, GRU_NUM_CCH)) {
729 spin_unlock(&gru->gs_lock);
732 reserve_gru_resources(gru, gts);
735 find_first_zero_bit(&gru->gs_context_map, GRU_NUM_CCH);
736 BUG_ON(gts->ts_ctxnum == GRU_NUM_CCH);
737 atomic_inc(>s->ts_refcnt);
738 gru->gs_gts[gts->ts_ctxnum] = gts;
739 __set_bit(gts->ts_ctxnum, &gru->gs_context_map);
740 spin_unlock(&gru->gs_lock);
742 STAT(assign_context);
744 "gseg %p, gts %p, gid %d, ctx %d, cbr %d, dsr %d\n",
745 gseg_virtual_address(gts->ts_gru, gts->ts_ctxnum), gts,
746 gts->ts_gru->gs_gid, gts->ts_ctxnum,
747 gts->ts_cbr_au_count, gts->ts_dsr_au_count);
749 gru_dbg(grudev, "failed to allocate a GTS %s\n", "");
750 STAT(assign_context_failed);
760 * Map the user's GRU segment
762 * Note: gru segments alway mmaped on GRU_GSEG_PAGESIZE boundaries.
764 int gru_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
766 struct gru_thread_state *gts;
767 unsigned long paddr, vaddr;
769 vaddr = (unsigned long)vmf->virtual_address;
770 gru_dbg(grudev, "vma %p, vaddr 0x%lx (0x%lx)\n",
771 vma, vaddr, GSEG_BASE(vaddr));
774 /* The following check ensures vaddr is a valid address in the VMA */
775 gts = gru_find_thread_state(vma, TSID(vaddr, vma));
777 return VM_FAULT_SIGBUS;
780 mutex_lock(>s->ts_ctxlock);
783 if (gts->ts_gru->gs_blade_id != uv_numa_blade_id()) {
784 STAT(migrated_nopfn_unload);
785 gru_unload_context(gts, 1);
787 if (gru_retarget_intr(gts))
788 STAT(migrated_nopfn_retarget);
793 if (!gru_assign_gru_context(gts)) {
794 mutex_unlock(>s->ts_ctxlock);
796 schedule_timeout(GRU_ASSIGN_DELAY); /* true hack ZZZ */
797 if (gts->ts_steal_jiffies + GRU_STEAL_DELAY < jiffies)
798 gru_steal_context(gts);
801 gru_load_context(gts);
802 paddr = gseg_physical_address(gts->ts_gru, gts->ts_ctxnum);
803 remap_pfn_range(vma, vaddr & ~(GRU_GSEG_PAGESIZE - 1),
804 paddr >> PAGE_SHIFT, GRU_GSEG_PAGESIZE,
808 mutex_unlock(>s->ts_ctxlock);
811 return VM_FAULT_NOPAGE;