3 * Copyright (C) 2001 Todd Inglett, IBM Corporation
5 * pSeries LPAR support.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 /* Enables debugging of low-level hash table routines - careful! */
25 #include <linux/kernel.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/console.h>
28 #include <linux/export.h>
29 #include <linux/jump_label.h>
30 #include <linux/delay.h>
31 #include <linux/stop_machine.h>
32 #include <asm/processor.h>
35 #include <asm/pgtable.h>
36 #include <asm/machdep.h>
37 #include <asm/mmu_context.h>
38 #include <asm/iommu.h>
39 #include <asm/tlbflush.h>
42 #include <asm/cputable.h>
45 #include <asm/trace.h>
46 #include <asm/firmware.h>
47 #include <asm/plpar_wrappers.h>
48 #include <asm/kexec.h>
49 #include <asm/fadump.h>
50 #include <asm/asm-prototypes.h>
54 /* Flag bits for H_BULK_REMOVE */
55 #define HBR_REQUEST 0x4000000000000000UL
56 #define HBR_RESPONSE 0x8000000000000000UL
57 #define HBR_END 0xc000000000000000UL
58 #define HBR_AVPN 0x0200000000000000UL
59 #define HBR_ANDCOND 0x0100000000000000UL
63 EXPORT_SYMBOL(plpar_hcall
);
64 EXPORT_SYMBOL(plpar_hcall9
);
65 EXPORT_SYMBOL(plpar_hcall_norets
);
67 void vpa_init(int cpu
)
69 int hwcpu
= get_hard_smp_processor_id(cpu
);
72 struct paca_struct
*pp
;
73 struct dtl_entry
*dtl
;
76 * The spec says it "may be problematic" if CPU x registers the VPA of
77 * CPU y. We should never do that, but wail if we ever do.
79 WARN_ON(cpu
!= smp_processor_id());
81 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
82 lppaca_of(cpu
).vmxregs_in_use
= 1;
84 if (cpu_has_feature(CPU_FTR_ARCH_207S
))
85 lppaca_of(cpu
).ebb_regs_in_use
= 1;
87 addr
= __pa(&lppaca_of(cpu
));
88 ret
= register_vpa(hwcpu
, addr
);
91 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
92 "%lx failed with %ld\n", cpu
, hwcpu
, addr
, ret
);
96 #ifdef CONFIG_PPC_STD_MMU_64
98 * PAPR says this feature is SLB-Buffer but firmware never
99 * reports that. All SPLPAR support SLB shadow buffer.
101 if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR
)) {
102 addr
= __pa(paca
[cpu
].slb_shadow_ptr
);
103 ret
= register_slb_shadow(hwcpu
, addr
);
105 pr_err("WARNING: SLB shadow buffer registration for "
106 "cpu %d (hw %d) of area %lx failed with %ld\n",
107 cpu
, hwcpu
, addr
, ret
);
109 #endif /* CONFIG_PPC_STD_MMU_64 */
112 * Register dispatch trace log, if one has been allocated.
115 dtl
= pp
->dispatch_log
;
119 lppaca_of(cpu
).dtl_idx
= 0;
121 /* hypervisor reads buffer length from this field */
122 dtl
->enqueue_to_dispatch_time
= cpu_to_be32(DISPATCH_LOG_BYTES
);
123 ret
= register_dtl(hwcpu
, __pa(dtl
));
125 pr_err("WARNING: DTL registration of cpu %d (hw %d) "
126 "failed with %ld\n", smp_processor_id(),
128 lppaca_of(cpu
).dtl_enable_mask
= 2;
132 #ifdef CONFIG_PPC_STD_MMU_64
134 static long pSeries_lpar_hpte_insert(unsigned long hpte_group
,
135 unsigned long vpn
, unsigned long pa
,
136 unsigned long rflags
, unsigned long vflags
,
137 int psize
, int apsize
, int ssize
)
139 unsigned long lpar_rc
;
142 unsigned long hpte_v
, hpte_r
;
144 if (!(vflags
& HPTE_V_BOLTED
))
145 pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
146 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
147 hpte_group
, vpn
, pa
, rflags
, vflags
, psize
);
149 hpte_v
= hpte_encode_v(vpn
, psize
, apsize
, ssize
) | vflags
| HPTE_V_VALID
;
150 hpte_r
= hpte_encode_r(pa
, psize
, apsize
) | rflags
;
152 if (!(vflags
& HPTE_V_BOLTED
))
153 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v
, hpte_r
);
155 /* Now fill in the actual HPTE */
156 /* Set CEC cookie to 0 */
158 /* I-cache Invalidate = 0 */
159 /* I-cache synchronize = 0 */
163 if (firmware_has_feature(FW_FEATURE_XCMO
) && !(hpte_r
& HPTE_R_N
))
164 flags
|= H_COALESCE_CAND
;
166 lpar_rc
= plpar_pte_enter(flags
, hpte_group
, hpte_v
, hpte_r
, &slot
);
167 if (unlikely(lpar_rc
== H_PTEG_FULL
)) {
168 if (!(vflags
& HPTE_V_BOLTED
))
174 * Since we try and ioremap PHBs we don't own, the pte insert
175 * will fail. However we must catch the failure in hash_page
176 * or we will loop forever, so return -2 in this case.
178 if (unlikely(lpar_rc
!= H_SUCCESS
)) {
179 if (!(vflags
& HPTE_V_BOLTED
))
180 pr_devel(" lpar err %ld\n", lpar_rc
);
183 if (!(vflags
& HPTE_V_BOLTED
))
184 pr_devel(" -> slot: %lu\n", slot
& 7);
186 /* Because of iSeries, we have to pass down the secondary
187 * bucket bit here as well
189 return (slot
& 7) | (!!(vflags
& HPTE_V_SECONDARY
) << 3);
192 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock
);
194 static long pSeries_lpar_hpte_remove(unsigned long hpte_group
)
196 unsigned long slot_offset
;
197 unsigned long lpar_rc
;
199 unsigned long dummy1
, dummy2
;
201 /* pick a random slot to start at */
202 slot_offset
= mftb() & 0x7;
204 for (i
= 0; i
< HPTES_PER_GROUP
; i
++) {
206 /* don't remove a bolted entry */
207 lpar_rc
= plpar_pte_remove(H_ANDCOND
, hpte_group
+ slot_offset
,
208 (0x1UL
<< 4), &dummy1
, &dummy2
);
209 if (lpar_rc
== H_SUCCESS
)
213 * The test for adjunct partition is performed before the
214 * ANDCOND test. H_RESOURCE may be returned, so we need to
215 * check for that as well.
217 BUG_ON(lpar_rc
!= H_NOT_FOUND
&& lpar_rc
!= H_RESOURCE
);
226 static void manual_hpte_clear_all(void)
228 unsigned long size_bytes
= 1UL << ppc64_pft_size
;
229 unsigned long hpte_count
= size_bytes
>> 4;
237 /* Read in batches of 4,
238 * invalidate only valid entries not in the VRMA
239 * hpte_count will be a multiple of 4
241 for (i
= 0; i
< hpte_count
; i
+= 4) {
242 lpar_rc
= plpar_pte_read_4_raw(0, i
, (void *)ptes
);
243 if (lpar_rc
!= H_SUCCESS
)
245 for (j
= 0; j
< 4; j
++){
246 if ((ptes
[j
].pteh
& HPTE_V_VRMA_MASK
) ==
249 if (ptes
[j
].pteh
& HPTE_V_VALID
)
250 plpar_pte_remove_raw(0, i
+ j
, 0,
251 &(ptes
[j
].pteh
), &(ptes
[j
].ptel
));
256 static int hcall_hpte_clear_all(void)
261 rc
= plpar_hcall_norets(H_CLEAR_HPT
);
262 } while (rc
== H_CONTINUE
);
267 static void pseries_hpte_clear_all(void)
271 rc
= hcall_hpte_clear_all();
273 manual_hpte_clear_all();
275 #ifdef __LITTLE_ENDIAN__
277 * Reset exceptions to big endian.
279 * FIXME this is a hack for kexec, we need to reset the exception
280 * endian before starting the new kernel and this is a convenient place
283 * This is also called on boot when a fadump happens. In that case we
284 * must not change the exception endian mode.
286 if (firmware_has_feature(FW_FEATURE_SET_MODE
) && !is_fadump_active())
287 pseries_big_endian_exceptions();
292 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
293 * the low 3 bits of flags happen to line up. So no transform is needed.
294 * We can probably optimize here and assume the high bits of newpp are
295 * already zero. For now I am paranoid.
297 static long pSeries_lpar_hpte_updatepp(unsigned long slot
,
300 int psize
, int apsize
,
301 int ssize
, unsigned long inv_flags
)
303 unsigned long lpar_rc
;
304 unsigned long flags
= (newpp
& 7) | H_AVPN
;
305 unsigned long want_v
;
307 want_v
= hpte_encode_avpn(vpn
, psize
, ssize
);
309 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
310 want_v
, slot
, flags
, psize
);
312 lpar_rc
= plpar_pte_protect(flags
, slot
, want_v
);
314 if (lpar_rc
== H_NOT_FOUND
) {
315 pr_devel("not found !\n");
321 BUG_ON(lpar_rc
!= H_SUCCESS
);
326 static long __pSeries_lpar_hpte_find(unsigned long want_v
, unsigned long hpte_group
)
335 for (i
= 0; i
< HPTES_PER_GROUP
; i
+= 4, hpte_group
+= 4) {
337 lpar_rc
= plpar_pte_read_4(0, hpte_group
, (void *)ptes
);
338 if (lpar_rc
!= H_SUCCESS
)
341 for (j
= 0; j
< 4; j
++) {
342 if (HPTE_V_COMPARE(ptes
[j
].pteh
, want_v
) &&
343 (ptes
[j
].pteh
& HPTE_V_VALID
))
351 static long pSeries_lpar_hpte_find(unsigned long vpn
, int psize
, int ssize
)
355 unsigned long want_v
;
356 unsigned long hpte_group
;
358 hash
= hpt_hash(vpn
, mmu_psize_defs
[psize
].shift
, ssize
);
359 want_v
= hpte_encode_avpn(vpn
, psize
, ssize
);
361 /* Bolted entries are always in the primary group */
362 hpte_group
= (hash
& htab_hash_mask
) * HPTES_PER_GROUP
;
363 slot
= __pSeries_lpar_hpte_find(want_v
, hpte_group
);
366 return hpte_group
+ slot
;
369 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp
,
371 int psize
, int ssize
)
374 unsigned long lpar_rc
, slot
, vsid
, flags
;
376 vsid
= get_kernel_vsid(ea
, ssize
);
377 vpn
= hpt_vpn(ea
, vsid
, ssize
);
379 slot
= pSeries_lpar_hpte_find(vpn
, psize
, ssize
);
383 lpar_rc
= plpar_pte_protect(flags
, slot
, 0);
385 BUG_ON(lpar_rc
!= H_SUCCESS
);
388 static void pSeries_lpar_hpte_invalidate(unsigned long slot
, unsigned long vpn
,
389 int psize
, int apsize
,
390 int ssize
, int local
)
392 unsigned long want_v
;
393 unsigned long lpar_rc
;
394 unsigned long dummy1
, dummy2
;
396 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
397 slot
, vpn
, psize
, local
);
399 want_v
= hpte_encode_avpn(vpn
, psize
, ssize
);
400 lpar_rc
= plpar_pte_remove(H_AVPN
, slot
, want_v
, &dummy1
, &dummy2
);
401 if (lpar_rc
== H_NOT_FOUND
)
404 BUG_ON(lpar_rc
!= H_SUCCESS
);
407 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
409 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
410 * to make sure that we avoid bouncing the hypervisor tlbie lock.
412 #define PPC64_HUGE_HPTE_BATCH 12
414 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot
,
415 unsigned long *vpn
, int count
,
416 int psize
, int ssize
)
418 unsigned long param
[PLPAR_HCALL9_BUFSIZE
];
419 int i
= 0, pix
= 0, rc
;
420 unsigned long flags
= 0;
421 int lock_tlbie
= !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE
);
424 spin_lock_irqsave(&pSeries_lpar_tlbie_lock
, flags
);
426 for (i
= 0; i
< count
; i
++) {
428 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE
)) {
429 pSeries_lpar_hpte_invalidate(slot
[i
], vpn
[i
], psize
, 0,
432 param
[pix
] = HBR_REQUEST
| HBR_AVPN
| slot
[i
];
433 param
[pix
+1] = hpte_encode_avpn(vpn
[i
], psize
, ssize
);
436 rc
= plpar_hcall9(H_BULK_REMOVE
, param
,
437 param
[0], param
[1], param
[2],
438 param
[3], param
[4], param
[5],
440 BUG_ON(rc
!= H_SUCCESS
);
446 param
[pix
] = HBR_END
;
447 rc
= plpar_hcall9(H_BULK_REMOVE
, param
, param
[0], param
[1],
448 param
[2], param
[3], param
[4], param
[5],
450 BUG_ON(rc
!= H_SUCCESS
);
454 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock
, flags
);
457 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid
,
459 unsigned char *hpte_slot_array
,
460 int psize
, int ssize
, int local
)
463 unsigned long s_addr
= addr
;
464 unsigned int max_hpte_count
, valid
;
465 unsigned long vpn_array
[PPC64_HUGE_HPTE_BATCH
];
466 unsigned long slot_array
[PPC64_HUGE_HPTE_BATCH
];
467 unsigned long shift
, hidx
, vpn
= 0, hash
, slot
;
469 shift
= mmu_psize_defs
[psize
].shift
;
470 max_hpte_count
= 1U << (PMD_SHIFT
- shift
);
472 for (i
= 0; i
< max_hpte_count
; i
++) {
473 valid
= hpte_valid(hpte_slot_array
, i
);
476 hidx
= hpte_hash_index(hpte_slot_array
, i
);
479 addr
= s_addr
+ (i
* (1ul << shift
));
480 vpn
= hpt_vpn(addr
, vsid
, ssize
);
481 hash
= hpt_hash(vpn
, shift
, ssize
);
482 if (hidx
& _PTEIDX_SECONDARY
)
485 slot
= (hash
& htab_hash_mask
) * HPTES_PER_GROUP
;
486 slot
+= hidx
& _PTEIDX_GROUP_IX
;
488 slot_array
[index
] = slot
;
489 vpn_array
[index
] = vpn
;
490 if (index
== PPC64_HUGE_HPTE_BATCH
- 1) {
492 * Now do a bluk invalidate
494 __pSeries_lpar_hugepage_invalidate(slot_array
,
496 PPC64_HUGE_HPTE_BATCH
,
503 __pSeries_lpar_hugepage_invalidate(slot_array
, vpn_array
,
504 index
, psize
, ssize
);
507 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid
,
509 unsigned char *hpte_slot_array
,
510 int psize
, int ssize
, int local
)
512 WARN(1, "%s called without THP support\n", __func__
);
516 static int pSeries_lpar_hpte_removebolted(unsigned long ea
,
517 int psize
, int ssize
)
520 unsigned long slot
, vsid
;
522 vsid
= get_kernel_vsid(ea
, ssize
);
523 vpn
= hpt_vpn(ea
, vsid
, ssize
);
525 slot
= pSeries_lpar_hpte_find(vpn
, psize
, ssize
);
530 * lpar doesn't use the passed actual page size
532 pSeries_lpar_hpte_invalidate(slot
, vpn
, psize
, 0, ssize
, 0);
537 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
540 static void pSeries_lpar_flush_hash_range(unsigned long number
, int local
)
543 unsigned long i
, pix
, rc
;
544 unsigned long flags
= 0;
545 struct ppc64_tlb_batch
*batch
= this_cpu_ptr(&ppc64_tlb_batch
);
546 int lock_tlbie
= !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE
);
547 unsigned long param
[PLPAR_HCALL9_BUFSIZE
];
548 unsigned long hash
, index
, shift
, hidx
, slot
;
553 spin_lock_irqsave(&pSeries_lpar_tlbie_lock
, flags
);
555 psize
= batch
->psize
;
556 ssize
= batch
->ssize
;
558 for (i
= 0; i
< number
; i
++) {
561 pte_iterate_hashed_subpages(pte
, psize
, vpn
, index
, shift
) {
562 hash
= hpt_hash(vpn
, shift
, ssize
);
563 hidx
= __rpte_to_hidx(pte
, index
);
564 if (hidx
& _PTEIDX_SECONDARY
)
566 slot
= (hash
& htab_hash_mask
) * HPTES_PER_GROUP
;
567 slot
+= hidx
& _PTEIDX_GROUP_IX
;
568 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE
)) {
570 * lpar doesn't use the passed actual page size
572 pSeries_lpar_hpte_invalidate(slot
, vpn
, psize
,
575 param
[pix
] = HBR_REQUEST
| HBR_AVPN
| slot
;
576 param
[pix
+1] = hpte_encode_avpn(vpn
, psize
,
580 rc
= plpar_hcall9(H_BULK_REMOVE
, param
,
581 param
[0], param
[1], param
[2],
582 param
[3], param
[4], param
[5],
584 BUG_ON(rc
!= H_SUCCESS
);
588 } pte_iterate_hashed_end();
591 param
[pix
] = HBR_END
;
592 rc
= plpar_hcall9(H_BULK_REMOVE
, param
, param
[0], param
[1],
593 param
[2], param
[3], param
[4], param
[5],
595 BUG_ON(rc
!= H_SUCCESS
);
599 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock
, flags
);
602 static int __init
disable_bulk_remove(char *str
)
604 if (strcmp(str
, "off") == 0 &&
605 firmware_has_feature(FW_FEATURE_BULK_REMOVE
)) {
606 printk(KERN_INFO
"Disabling BULK_REMOVE firmware feature");
607 powerpc_firmware_features
&= ~FW_FEATURE_BULK_REMOVE
;
612 __setup("bulk_remove=", disable_bulk_remove
);
614 #define HPT_RESIZE_TIMEOUT 10000 /* ms */
616 struct hpt_resize_state
{
621 static int pseries_lpar_resize_hpt_commit(void *data
)
623 struct hpt_resize_state
*state
= data
;
625 state
->commit_rc
= plpar_resize_hpt_commit(0, state
->shift
);
626 if (state
->commit_rc
!= H_SUCCESS
)
629 /* Hypervisor has transitioned the HTAB, update our globals */
630 ppc64_pft_size
= state
->shift
;
631 htab_size_bytes
= 1UL << ppc64_pft_size
;
632 htab_hash_mask
= (htab_size_bytes
>> 7) - 1;
637 /* Must be called in user context */
638 static int pseries_lpar_resize_hpt(unsigned long shift
)
640 struct hpt_resize_state state
= {
642 .commit_rc
= H_FUNCTION
,
644 unsigned int delay
, total_delay
= 0;
650 if (!firmware_has_feature(FW_FEATURE_HPT_RESIZE
))
653 printk(KERN_INFO
"lpar: Attempting to resize HPT to shift %lu\n",
658 rc
= plpar_resize_hpt_prepare(0, shift
);
659 while (H_IS_LONG_BUSY(rc
)) {
660 delay
= get_longbusy_msecs(rc
);
661 total_delay
+= delay
;
662 if (total_delay
> HPT_RESIZE_TIMEOUT
) {
663 /* prepare with shift==0 cancels an in-progress resize */
664 rc
= plpar_resize_hpt_prepare(0, 0);
667 "lpar: Unexpected error %d cancelling timed out HPT resize\n",
672 rc
= plpar_resize_hpt_prepare(0, shift
);
686 "lpar: Unexpected error %d from H_RESIZE_HPT_PREPARE\n",
693 rc
= stop_machine(pseries_lpar_resize_hpt_commit
, &state
, NULL
);
698 switch (state
.commit_rc
) {
701 "lpar: Hash collision while resizing HPT\n");
706 "lpar: Unexpected error %d from H_RESIZE_HPT_COMMIT\n",
713 "lpar: HPT resize to shift %lu complete (%lld ms / %lld ms)\n",
714 shift
, (long long) ktime_ms_delta(t1
, t0
),
715 (long long) ktime_ms_delta(t2
, t1
));
720 /* Actually only used for radix, so far */
721 static int pseries_lpar_register_process_table(unsigned long base
,
722 unsigned long page_size
, unsigned long table_size
)
725 unsigned long flags
= PROC_TABLE_NEW
;
728 flags
|= PROC_TABLE_RADIX
| PROC_TABLE_GTSE
;
730 rc
= plpar_hcall_norets(H_REGISTER_PROC_TBL
, flags
, base
,
731 page_size
, table_size
);
732 if (!H_IS_LONG_BUSY(rc
))
734 mdelay(get_longbusy_msecs(rc
));
736 if (rc
!= H_SUCCESS
) {
737 pr_err("Failed to register process table (rc=%ld)\n", rc
);
743 void __init
hpte_init_pseries(void)
745 mmu_hash_ops
.hpte_invalidate
= pSeries_lpar_hpte_invalidate
;
746 mmu_hash_ops
.hpte_updatepp
= pSeries_lpar_hpte_updatepp
;
747 mmu_hash_ops
.hpte_updateboltedpp
= pSeries_lpar_hpte_updateboltedpp
;
748 mmu_hash_ops
.hpte_insert
= pSeries_lpar_hpte_insert
;
749 mmu_hash_ops
.hpte_remove
= pSeries_lpar_hpte_remove
;
750 mmu_hash_ops
.hpte_removebolted
= pSeries_lpar_hpte_removebolted
;
751 mmu_hash_ops
.flush_hash_range
= pSeries_lpar_flush_hash_range
;
752 mmu_hash_ops
.hpte_clear_all
= pseries_hpte_clear_all
;
753 mmu_hash_ops
.hugepage_invalidate
= pSeries_lpar_hugepage_invalidate
;
754 mmu_hash_ops
.resize_hpt
= pseries_lpar_resize_hpt
;
757 void radix_init_pseries(void)
759 pr_info("Using radix MMU under hypervisor\n");
760 register_process_table
= pseries_lpar_register_process_table
;
763 #ifdef CONFIG_PPC_SMLPAR
764 #define CMO_FREE_HINT_DEFAULT 1
765 static int cmo_free_hint_flag
= CMO_FREE_HINT_DEFAULT
;
767 static int __init
cmo_free_hint(char *str
)
770 parm
= strstrip(str
);
772 if (strcasecmp(parm
, "no") == 0 || strcasecmp(parm
, "off") == 0) {
773 printk(KERN_INFO
"cmo_free_hint: CMO free page hinting is not active.\n");
774 cmo_free_hint_flag
= 0;
778 cmo_free_hint_flag
= 1;
779 printk(KERN_INFO
"cmo_free_hint: CMO free page hinting is active.\n");
781 if (strcasecmp(parm
, "yes") == 0 || strcasecmp(parm
, "on") == 0)
787 __setup("cmo_free_hint=", cmo_free_hint
);
789 static void pSeries_set_page_state(struct page
*page
, int order
,
793 unsigned long cmo_page_sz
, addr
;
795 cmo_page_sz
= cmo_get_page_size();
796 addr
= __pa((unsigned long)page_address(page
));
798 for (i
= 0; i
< (1 << order
); i
++, addr
+= PAGE_SIZE
) {
799 for (j
= 0; j
< PAGE_SIZE
; j
+= cmo_page_sz
)
800 plpar_hcall_norets(H_PAGE_INIT
, state
, addr
+ j
, 0);
804 void arch_free_page(struct page
*page
, int order
)
808 if (!cmo_free_hint_flag
|| !firmware_has_feature(FW_FEATURE_CMO
))
811 pSeries_set_page_state(page
, order
, H_PAGE_SET_UNUSED
);
813 EXPORT_SYMBOL(arch_free_page
);
815 #endif /* CONFIG_PPC_SMLPAR */
816 #endif /* CONFIG_PPC_STD_MMU_64 */
818 #ifdef CONFIG_TRACEPOINTS
819 #ifdef HAVE_JUMP_LABEL
820 struct static_key hcall_tracepoint_key
= STATIC_KEY_INIT
;
822 int hcall_tracepoint_regfunc(void)
824 static_key_slow_inc(&hcall_tracepoint_key
);
828 void hcall_tracepoint_unregfunc(void)
830 static_key_slow_dec(&hcall_tracepoint_key
);
834 * We optimise our hcall path by placing hcall_tracepoint_refcount
835 * directly in the TOC so we can check if the hcall tracepoints are
836 * enabled via a single load.
839 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
840 extern long hcall_tracepoint_refcount
;
842 int hcall_tracepoint_regfunc(void)
844 hcall_tracepoint_refcount
++;
848 void hcall_tracepoint_unregfunc(void)
850 hcall_tracepoint_refcount
--;
855 * Since the tracing code might execute hcalls we need to guard against
856 * recursion. One example of this are spinlocks calling H_YIELD on
857 * shared processor partitions.
859 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth
);
862 void __trace_hcall_entry(unsigned long opcode
, unsigned long *args
)
868 * We cannot call tracepoints inside RCU idle regions which
869 * means we must not trace H_CEDE.
871 if (opcode
== H_CEDE
)
874 local_irq_save(flags
);
876 depth
= this_cpu_ptr(&hcall_trace_depth
);
883 trace_hcall_entry(opcode
, args
);
887 local_irq_restore(flags
);
890 void __trace_hcall_exit(long opcode
, unsigned long retval
,
891 unsigned long *retbuf
)
896 if (opcode
== H_CEDE
)
899 local_irq_save(flags
);
901 depth
= this_cpu_ptr(&hcall_trace_depth
);
907 trace_hcall_exit(opcode
, retval
, retbuf
);
912 local_irq_restore(flags
);
918 * H_GET_MPP hcall returns info in 7 parms
920 int h_get_mpp(struct hvcall_mpp_data
*mpp_data
)
923 unsigned long retbuf
[PLPAR_HCALL9_BUFSIZE
];
925 rc
= plpar_hcall9(H_GET_MPP
, retbuf
);
927 mpp_data
->entitled_mem
= retbuf
[0];
928 mpp_data
->mapped_mem
= retbuf
[1];
930 mpp_data
->group_num
= (retbuf
[2] >> 2 * 8) & 0xffff;
931 mpp_data
->pool_num
= retbuf
[2] & 0xffff;
933 mpp_data
->mem_weight
= (retbuf
[3] >> 7 * 8) & 0xff;
934 mpp_data
->unallocated_mem_weight
= (retbuf
[3] >> 6 * 8) & 0xff;
935 mpp_data
->unallocated_entitlement
= retbuf
[3] & 0xffffffffffffUL
;
937 mpp_data
->pool_size
= retbuf
[4];
938 mpp_data
->loan_request
= retbuf
[5];
939 mpp_data
->backing_mem
= retbuf
[6];
943 EXPORT_SYMBOL(h_get_mpp
);
945 int h_get_mpp_x(struct hvcall_mpp_x_data
*mpp_x_data
)
948 unsigned long retbuf
[PLPAR_HCALL9_BUFSIZE
] = { 0 };
950 rc
= plpar_hcall9(H_GET_MPP_X
, retbuf
);
952 mpp_x_data
->coalesced_bytes
= retbuf
[0];
953 mpp_x_data
->pool_coalesced_bytes
= retbuf
[1];
954 mpp_x_data
->pool_purr_cycles
= retbuf
[2];
955 mpp_x_data
->pool_spurr_cycles
= retbuf
[3];