2 * APEI Generic Hardware Error Source support
4 * Generic Hardware Error Source provides a way to report platform
5 * hardware errors (such as that from chipset). It works in so called
6 * "Firmware First" mode, that is, hardware errors are reported to
7 * firmware firstly, then reported to Linux by firmware. This way,
8 * some non-standard hardware error registers or non-standard hardware
9 * link can be checked by firmware to produce more hardware error
10 * information for Linux.
12 * For more information about Generic Hardware Error Source, please
13 * refer to ACPI Specification version 4.0, section 17.3.2.6
15 * Copyright 2010,2011 Intel Corp.
16 * Author: Huang Ying <ying.huang@intel.com>
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License version
20 * 2 as published by the Free Software Foundation;
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/init.h>
35 #include <linux/acpi.h>
36 #include <linux/acpi_io.h>
38 #include <linux/interrupt.h>
39 #include <linux/timer.h>
40 #include <linux/cper.h>
41 #include <linux/kdebug.h>
42 #include <linux/platform_device.h>
43 #include <linux/mutex.h>
44 #include <linux/ratelimit.h>
45 #include <linux/vmalloc.h>
46 #include <linux/irq_work.h>
47 #include <linux/llist.h>
48 #include <linux/genalloc.h>
49 #include <linux/pci.h>
50 #include <linux/aer.h>
51 #include <acpi/apei.h>
54 #include <asm/tlbflush.h>
57 #include "apei-internal.h"
59 #define GHES_PFX "GHES: "
61 #define GHES_ESTATUS_MAX_SIZE 65536
62 #define GHES_ESOURCE_PREALLOC_MAX_SIZE 65536
64 #define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
66 /* This is just an estimation for memory pool allocation */
67 #define GHES_ESTATUS_CACHE_AVG_SIZE 512
69 #define GHES_ESTATUS_CACHES_SIZE 4
71 #define GHES_ESTATUS_IN_CACHE_MAX_NSEC 10000000000ULL
72 /* Prevent too many caches are allocated because of RCU */
73 #define GHES_ESTATUS_CACHE_ALLOCED_MAX (GHES_ESTATUS_CACHES_SIZE * 3 / 2)
75 #define GHES_ESTATUS_CACHE_LEN(estatus_len) \
76 (sizeof(struct ghes_estatus_cache) + (estatus_len))
77 #define GHES_ESTATUS_FROM_CACHE(estatus_cache) \
78 ((struct acpi_hest_generic_status *) \
79 ((struct ghes_estatus_cache *)(estatus_cache) + 1))
81 #define GHES_ESTATUS_NODE_LEN(estatus_len) \
82 (sizeof(struct ghes_estatus_node) + (estatus_len))
83 #define GHES_ESTATUS_FROM_NODE(estatus_node) \
84 ((struct acpi_hest_generic_status *) \
85 ((struct ghes_estatus_node *)(estatus_node) + 1))
88 * One struct ghes is created for each generic hardware error source.
89 * It provides the context for APEI hardware error timer/IRQ/SCI/NMI
92 * estatus: memory buffer for error status block, allocated during
95 #define GHES_TO_CLEAR 0x0001
96 #define GHES_EXITING 0x0002
99 struct acpi_hest_generic
*generic
;
100 struct acpi_hest_generic_status
*estatus
;
104 struct list_head list
;
105 struct timer_list timer
;
110 struct ghes_estatus_node
{
111 struct llist_node llnode
;
112 struct acpi_hest_generic
*generic
;
115 struct ghes_estatus_cache
{
118 struct acpi_hest_generic
*generic
;
119 unsigned long long time_in
;
124 module_param_named(disable
, ghes_disable
, bool, 0);
126 static int ghes_panic_timeout __read_mostly
= 30;
129 * All error sources notified with SCI shares one notifier function,
130 * so they need to be linked and checked one by one. This is applied
133 * RCU is used for these lists, so ghes_list_mutex is only used for
134 * list changing, not for traversing.
136 static LIST_HEAD(ghes_sci
);
137 static LIST_HEAD(ghes_nmi
);
138 static DEFINE_MUTEX(ghes_list_mutex
);
141 * NMI may be triggered on any CPU, so ghes_nmi_lock is used for
144 static DEFINE_RAW_SPINLOCK(ghes_nmi_lock
);
147 * Because the memory area used to transfer hardware error information
148 * from BIOS to Linux can be determined only in NMI, IRQ or timer
149 * handler, but general ioremap can not be used in atomic context, so
150 * a special version of atomic ioremap is implemented for that.
154 * Two virtual pages are used, one for NMI context, the other for
155 * IRQ/PROCESS context
157 #define GHES_IOREMAP_PAGES 2
158 #define GHES_IOREMAP_NMI_PAGE(base) (base)
159 #define GHES_IOREMAP_IRQ_PAGE(base) ((base) + PAGE_SIZE)
161 /* virtual memory area for atomic ioremap */
162 static struct vm_struct
*ghes_ioremap_area
;
164 * These 2 spinlock is used to prevent atomic ioremap virtual memory
165 * area from being mapped simultaneously.
167 static DEFINE_RAW_SPINLOCK(ghes_ioremap_lock_nmi
);
168 static DEFINE_SPINLOCK(ghes_ioremap_lock_irq
);
171 * printk is not safe in NMI context. So in NMI handler, we allocate
172 * required memory from lock-less memory allocator
173 * (ghes_estatus_pool), save estatus into it, put them into lock-less
174 * list (ghes_estatus_llist), then delay printk into IRQ context via
175 * irq_work (ghes_proc_irq_work). ghes_estatus_size_request record
176 * required pool size by all NMI error source.
178 static struct gen_pool
*ghes_estatus_pool
;
179 static unsigned long ghes_estatus_pool_size_request
;
180 static struct llist_head ghes_estatus_llist
;
181 static struct irq_work ghes_proc_irq_work
;
183 struct ghes_estatus_cache
*ghes_estatus_caches
[GHES_ESTATUS_CACHES_SIZE
];
184 static atomic_t ghes_estatus_cache_alloced
;
186 static int ghes_ioremap_init(void)
188 ghes_ioremap_area
= __get_vm_area(PAGE_SIZE
* GHES_IOREMAP_PAGES
,
189 VM_IOREMAP
, VMALLOC_START
, VMALLOC_END
);
190 if (!ghes_ioremap_area
) {
191 pr_err(GHES_PFX
"Failed to allocate virtual memory area for atomic ioremap.\n");
198 static void ghes_ioremap_exit(void)
200 free_vm_area(ghes_ioremap_area
);
203 static void __iomem
*ghes_ioremap_pfn_nmi(u64 pfn
)
207 vaddr
= (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area
->addr
);
208 ioremap_page_range(vaddr
, vaddr
+ PAGE_SIZE
,
209 pfn
<< PAGE_SHIFT
, PAGE_KERNEL
);
211 return (void __iomem
*)vaddr
;
214 static void __iomem
*ghes_ioremap_pfn_irq(u64 pfn
)
218 vaddr
= (unsigned long)GHES_IOREMAP_IRQ_PAGE(ghes_ioremap_area
->addr
);
219 ioremap_page_range(vaddr
, vaddr
+ PAGE_SIZE
,
220 pfn
<< PAGE_SHIFT
, PAGE_KERNEL
);
222 return (void __iomem
*)vaddr
;
225 static void ghes_iounmap_nmi(void __iomem
*vaddr_ptr
)
227 unsigned long vaddr
= (unsigned long __force
)vaddr_ptr
;
228 void *base
= ghes_ioremap_area
->addr
;
230 BUG_ON(vaddr
!= (unsigned long)GHES_IOREMAP_NMI_PAGE(base
));
231 unmap_kernel_range_noflush(vaddr
, PAGE_SIZE
);
232 __flush_tlb_one(vaddr
);
235 static void ghes_iounmap_irq(void __iomem
*vaddr_ptr
)
237 unsigned long vaddr
= (unsigned long __force
)vaddr_ptr
;
238 void *base
= ghes_ioremap_area
->addr
;
240 BUG_ON(vaddr
!= (unsigned long)GHES_IOREMAP_IRQ_PAGE(base
));
241 unmap_kernel_range_noflush(vaddr
, PAGE_SIZE
);
242 __flush_tlb_one(vaddr
);
245 static int ghes_estatus_pool_init(void)
247 ghes_estatus_pool
= gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER
, -1);
248 if (!ghes_estatus_pool
)
253 static void ghes_estatus_pool_free_chunk_page(struct gen_pool
*pool
,
254 struct gen_pool_chunk
*chunk
,
257 free_page(chunk
->start_addr
);
260 static void ghes_estatus_pool_exit(void)
262 gen_pool_for_each_chunk(ghes_estatus_pool
,
263 ghes_estatus_pool_free_chunk_page
, NULL
);
264 gen_pool_destroy(ghes_estatus_pool
);
267 static int ghes_estatus_pool_expand(unsigned long len
)
269 unsigned long i
, pages
, size
, addr
;
272 ghes_estatus_pool_size_request
+= PAGE_ALIGN(len
);
273 size
= gen_pool_size(ghes_estatus_pool
);
274 if (size
>= ghes_estatus_pool_size_request
)
276 pages
= (ghes_estatus_pool_size_request
- size
) / PAGE_SIZE
;
277 for (i
= 0; i
< pages
; i
++) {
278 addr
= __get_free_page(GFP_KERNEL
);
281 ret
= gen_pool_add(ghes_estatus_pool
, addr
, PAGE_SIZE
, -1);
289 static void ghes_estatus_pool_shrink(unsigned long len
)
291 ghes_estatus_pool_size_request
-= PAGE_ALIGN(len
);
294 static struct ghes
*ghes_new(struct acpi_hest_generic
*generic
)
297 unsigned int error_block_length
;
300 ghes
= kzalloc(sizeof(*ghes
), GFP_KERNEL
);
302 return ERR_PTR(-ENOMEM
);
303 ghes
->generic
= generic
;
304 rc
= apei_map_generic_address(&generic
->error_status_address
);
307 error_block_length
= generic
->error_block_length
;
308 if (error_block_length
> GHES_ESTATUS_MAX_SIZE
) {
309 pr_warning(FW_WARN GHES_PFX
310 "Error status block length is too long: %u for "
311 "generic hardware error source: %d.\n",
312 error_block_length
, generic
->header
.source_id
);
313 error_block_length
= GHES_ESTATUS_MAX_SIZE
;
315 ghes
->estatus
= kmalloc(error_block_length
, GFP_KERNEL
);
316 if (!ghes
->estatus
) {
324 apei_unmap_generic_address(&generic
->error_status_address
);
330 static void ghes_fini(struct ghes
*ghes
)
332 kfree(ghes
->estatus
);
333 apei_unmap_generic_address(&ghes
->generic
->error_status_address
);
338 GHES_SEV_CORRECTED
= 0x1,
339 GHES_SEV_RECOVERABLE
= 0x2,
340 GHES_SEV_PANIC
= 0x3,
343 static inline int ghes_severity(int severity
)
346 case CPER_SEV_INFORMATIONAL
:
348 case CPER_SEV_CORRECTED
:
349 return GHES_SEV_CORRECTED
;
350 case CPER_SEV_RECOVERABLE
:
351 return GHES_SEV_RECOVERABLE
;
353 return GHES_SEV_PANIC
;
355 /* Unknown, go panic */
356 return GHES_SEV_PANIC
;
360 static void ghes_copy_tofrom_phys(void *buffer
, u64 paddr
, u32 len
,
364 unsigned long flags
= 0;
365 int in_nmi
= in_nmi();
370 offset
= paddr
- (paddr
& PAGE_MASK
);
372 raw_spin_lock(&ghes_ioremap_lock_nmi
);
373 vaddr
= ghes_ioremap_pfn_nmi(paddr
>> PAGE_SHIFT
);
375 spin_lock_irqsave(&ghes_ioremap_lock_irq
, flags
);
376 vaddr
= ghes_ioremap_pfn_irq(paddr
>> PAGE_SHIFT
);
378 trunk
= PAGE_SIZE
- offset
;
379 trunk
= min(trunk
, len
);
381 memcpy_fromio(buffer
, vaddr
+ offset
, trunk
);
383 memcpy_toio(vaddr
+ offset
, buffer
, trunk
);
388 ghes_iounmap_nmi(vaddr
);
389 raw_spin_unlock(&ghes_ioremap_lock_nmi
);
391 ghes_iounmap_irq(vaddr
);
392 spin_unlock_irqrestore(&ghes_ioremap_lock_irq
, flags
);
397 static int ghes_read_estatus(struct ghes
*ghes
, int silent
)
399 struct acpi_hest_generic
*g
= ghes
->generic
;
404 rc
= apei_read(&buf_paddr
, &g
->error_status_address
);
406 if (!silent
&& printk_ratelimit())
407 pr_warning(FW_WARN GHES_PFX
408 "Failed to read error status block address for hardware error source: %d.\n",
409 g
->header
.source_id
);
415 ghes_copy_tofrom_phys(ghes
->estatus
, buf_paddr
,
416 sizeof(*ghes
->estatus
), 1);
417 if (!ghes
->estatus
->block_status
)
420 ghes
->buffer_paddr
= buf_paddr
;
421 ghes
->flags
|= GHES_TO_CLEAR
;
424 len
= apei_estatus_len(ghes
->estatus
);
425 if (len
< sizeof(*ghes
->estatus
))
427 if (len
> ghes
->generic
->error_block_length
)
429 if (apei_estatus_check_header(ghes
->estatus
))
431 ghes_copy_tofrom_phys(ghes
->estatus
+ 1,
432 buf_paddr
+ sizeof(*ghes
->estatus
),
433 len
- sizeof(*ghes
->estatus
), 1);
434 if (apei_estatus_check(ghes
->estatus
))
439 if (rc
&& !silent
&& printk_ratelimit())
440 pr_warning(FW_WARN GHES_PFX
441 "Failed to read error status block!\n");
445 static void ghes_clear_estatus(struct ghes
*ghes
)
447 ghes
->estatus
->block_status
= 0;
448 if (!(ghes
->flags
& GHES_TO_CLEAR
))
450 ghes_copy_tofrom_phys(ghes
->estatus
, ghes
->buffer_paddr
,
451 sizeof(ghes
->estatus
->block_status
), 0);
452 ghes
->flags
&= ~GHES_TO_CLEAR
;
455 static void ghes_do_proc(const struct acpi_hest_generic_status
*estatus
)
458 struct acpi_hest_generic_data
*gdata
;
460 sev
= ghes_severity(estatus
->error_severity
);
461 apei_estatus_for_each_section(estatus
, gdata
) {
462 sec_sev
= ghes_severity(gdata
->error_severity
);
463 if (!uuid_le_cmp(*(uuid_le
*)gdata
->section_type
,
464 CPER_SEC_PLATFORM_MEM
)) {
465 struct cper_sec_mem_err
*mem_err
;
466 mem_err
= (struct cper_sec_mem_err
*)(gdata
+1);
467 #ifdef CONFIG_X86_MCE
468 apei_mce_report_mem_error(sev
== GHES_SEV_CORRECTED
,
471 #ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE
472 if (sev
== GHES_SEV_RECOVERABLE
&&
473 sec_sev
== GHES_SEV_RECOVERABLE
&&
474 mem_err
->validation_bits
& CPER_MEM_VALID_PHYSICAL_ADDRESS
) {
476 pfn
= mem_err
->physical_addr
>> PAGE_SHIFT
;
477 memory_failure_queue(pfn
, 0, 0);
481 #ifdef CONFIG_ACPI_APEI_PCIEAER
482 else if (!uuid_le_cmp(*(uuid_le
*)gdata
->section_type
,
484 struct cper_sec_pcie
*pcie_err
;
485 pcie_err
= (struct cper_sec_pcie
*)(gdata
+1);
486 if (sev
== GHES_SEV_RECOVERABLE
&&
487 sec_sev
== GHES_SEV_RECOVERABLE
&&
488 pcie_err
->validation_bits
& CPER_PCIE_VALID_DEVICE_ID
&&
489 pcie_err
->validation_bits
& CPER_PCIE_VALID_AER_INFO
) {
492 devfn
= PCI_DEVFN(pcie_err
->device_id
.device
,
493 pcie_err
->device_id
.function
);
494 aer_severity
= cper_severity_to_aer(sev
);
495 aer_recover_queue(pcie_err
->device_id
.segment
,
496 pcie_err
->device_id
.bus
,
497 devfn
, aer_severity
);
505 static void __ghes_print_estatus(const char *pfx
,
506 const struct acpi_hest_generic
*generic
,
507 const struct acpi_hest_generic_status
*estatus
)
509 static atomic_t seqno
;
510 unsigned int curr_seqno
;
514 if (ghes_severity(estatus
->error_severity
) <=
520 curr_seqno
= atomic_inc_return(&seqno
);
521 snprintf(pfx_seq
, sizeof(pfx_seq
), "%s{%u}" HW_ERR
, pfx
, curr_seqno
);
522 printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
523 pfx_seq
, generic
->header
.source_id
);
524 apei_estatus_print(pfx_seq
, estatus
);
527 static int ghes_print_estatus(const char *pfx
,
528 const struct acpi_hest_generic
*generic
,
529 const struct acpi_hest_generic_status
*estatus
)
531 /* Not more than 2 messages every 5 seconds */
532 static DEFINE_RATELIMIT_STATE(ratelimit_corrected
, 5*HZ
, 2);
533 static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected
, 5*HZ
, 2);
534 struct ratelimit_state
*ratelimit
;
536 if (ghes_severity(estatus
->error_severity
) <= GHES_SEV_CORRECTED
)
537 ratelimit
= &ratelimit_corrected
;
539 ratelimit
= &ratelimit_uncorrected
;
540 if (__ratelimit(ratelimit
)) {
541 __ghes_print_estatus(pfx
, generic
, estatus
);
548 * GHES error status reporting throttle, to report more kinds of
549 * errors, instead of just most frequently occurred errors.
551 static int ghes_estatus_cached(struct acpi_hest_generic_status
*estatus
)
555 unsigned long long now
;
556 struct ghes_estatus_cache
*cache
;
557 struct acpi_hest_generic_status
*cache_estatus
;
559 len
= apei_estatus_len(estatus
);
561 for (i
= 0; i
< GHES_ESTATUS_CACHES_SIZE
; i
++) {
562 cache
= rcu_dereference(ghes_estatus_caches
[i
]);
565 if (len
!= cache
->estatus_len
)
567 cache_estatus
= GHES_ESTATUS_FROM_CACHE(cache
);
568 if (memcmp(estatus
, cache_estatus
, len
))
570 atomic_inc(&cache
->count
);
572 if (now
- cache
->time_in
< GHES_ESTATUS_IN_CACHE_MAX_NSEC
)
580 static struct ghes_estatus_cache
*ghes_estatus_cache_alloc(
581 struct acpi_hest_generic
*generic
,
582 struct acpi_hest_generic_status
*estatus
)
586 struct ghes_estatus_cache
*cache
;
587 struct acpi_hest_generic_status
*cache_estatus
;
589 alloced
= atomic_add_return(1, &ghes_estatus_cache_alloced
);
590 if (alloced
> GHES_ESTATUS_CACHE_ALLOCED_MAX
) {
591 atomic_dec(&ghes_estatus_cache_alloced
);
594 len
= apei_estatus_len(estatus
);
595 cache_len
= GHES_ESTATUS_CACHE_LEN(len
);
596 cache
= (void *)gen_pool_alloc(ghes_estatus_pool
, cache_len
);
598 atomic_dec(&ghes_estatus_cache_alloced
);
601 cache_estatus
= GHES_ESTATUS_FROM_CACHE(cache
);
602 memcpy(cache_estatus
, estatus
, len
);
603 cache
->estatus_len
= len
;
604 atomic_set(&cache
->count
, 0);
605 cache
->generic
= generic
;
606 cache
->time_in
= sched_clock();
610 static void ghes_estatus_cache_free(struct ghes_estatus_cache
*cache
)
614 len
= apei_estatus_len(GHES_ESTATUS_FROM_CACHE(cache
));
615 len
= GHES_ESTATUS_CACHE_LEN(len
);
616 gen_pool_free(ghes_estatus_pool
, (unsigned long)cache
, len
);
617 atomic_dec(&ghes_estatus_cache_alloced
);
620 static void ghes_estatus_cache_rcu_free(struct rcu_head
*head
)
622 struct ghes_estatus_cache
*cache
;
624 cache
= container_of(head
, struct ghes_estatus_cache
, rcu
);
625 ghes_estatus_cache_free(cache
);
628 static void ghes_estatus_cache_add(
629 struct acpi_hest_generic
*generic
,
630 struct acpi_hest_generic_status
*estatus
)
632 int i
, slot
= -1, count
;
633 unsigned long long now
, duration
, period
, max_period
= 0;
634 struct ghes_estatus_cache
*cache
, *slot_cache
= NULL
, *new_cache
;
636 new_cache
= ghes_estatus_cache_alloc(generic
, estatus
);
637 if (new_cache
== NULL
)
641 for (i
= 0; i
< GHES_ESTATUS_CACHES_SIZE
; i
++) {
642 cache
= rcu_dereference(ghes_estatus_caches
[i
]);
648 duration
= now
- cache
->time_in
;
649 if (duration
>= GHES_ESTATUS_IN_CACHE_MAX_NSEC
) {
654 count
= atomic_read(&cache
->count
);
656 do_div(period
, (count
+ 1));
657 if (period
> max_period
) {
663 /* new_cache must be put into array after its contents are written */
665 if (slot
!= -1 && cmpxchg(ghes_estatus_caches
+ slot
,
666 slot_cache
, new_cache
) == slot_cache
) {
668 call_rcu(&slot_cache
->rcu
, ghes_estatus_cache_rcu_free
);
670 ghes_estatus_cache_free(new_cache
);
674 static int ghes_proc(struct ghes
*ghes
)
678 rc
= ghes_read_estatus(ghes
, 0);
681 if (!ghes_estatus_cached(ghes
->estatus
)) {
682 if (ghes_print_estatus(NULL
, ghes
->generic
, ghes
->estatus
))
683 ghes_estatus_cache_add(ghes
->generic
, ghes
->estatus
);
685 ghes_do_proc(ghes
->estatus
);
687 ghes_clear_estatus(ghes
);
691 static void ghes_add_timer(struct ghes
*ghes
)
693 struct acpi_hest_generic
*g
= ghes
->generic
;
694 unsigned long expire
;
696 if (!g
->notify
.poll_interval
) {
697 pr_warning(FW_WARN GHES_PFX
"Poll interval is 0 for generic hardware error source: %d, disabled.\n",
698 g
->header
.source_id
);
701 expire
= jiffies
+ msecs_to_jiffies(g
->notify
.poll_interval
);
702 ghes
->timer
.expires
= round_jiffies_relative(expire
);
703 add_timer(&ghes
->timer
);
706 static void ghes_poll_func(unsigned long data
)
708 struct ghes
*ghes
= (void *)data
;
711 if (!(ghes
->flags
& GHES_EXITING
))
712 ghes_add_timer(ghes
);
715 static irqreturn_t
ghes_irq_func(int irq
, void *data
)
717 struct ghes
*ghes
= data
;
720 rc
= ghes_proc(ghes
);
727 static int ghes_notify_sci(struct notifier_block
*this,
728 unsigned long event
, void *data
)
731 int ret
= NOTIFY_DONE
;
734 list_for_each_entry_rcu(ghes
, &ghes_sci
, list
) {
735 if (!ghes_proc(ghes
))
743 static struct llist_node
*llist_nodes_reverse(struct llist_node
*llnode
)
745 struct llist_node
*next
, *tail
= NULL
;
757 static void ghes_proc_in_irq(struct irq_work
*irq_work
)
759 struct llist_node
*llnode
, *next
;
760 struct ghes_estatus_node
*estatus_node
;
761 struct acpi_hest_generic
*generic
;
762 struct acpi_hest_generic_status
*estatus
;
765 llnode
= llist_del_all(&ghes_estatus_llist
);
767 * Because the time order of estatus in list is reversed,
768 * revert it back to proper order.
770 llnode
= llist_nodes_reverse(llnode
);
773 estatus_node
= llist_entry(llnode
, struct ghes_estatus_node
,
775 estatus
= GHES_ESTATUS_FROM_NODE(estatus_node
);
776 len
= apei_estatus_len(estatus
);
777 node_len
= GHES_ESTATUS_NODE_LEN(len
);
778 ghes_do_proc(estatus
);
779 if (!ghes_estatus_cached(estatus
)) {
780 generic
= estatus_node
->generic
;
781 if (ghes_print_estatus(NULL
, generic
, estatus
))
782 ghes_estatus_cache_add(generic
, estatus
);
784 gen_pool_free(ghes_estatus_pool
, (unsigned long)estatus_node
,
790 static void ghes_print_queued_estatus(void)
792 struct llist_node
*llnode
;
793 struct ghes_estatus_node
*estatus_node
;
794 struct acpi_hest_generic
*generic
;
795 struct acpi_hest_generic_status
*estatus
;
798 llnode
= llist_del_all(&ghes_estatus_llist
);
800 * Because the time order of estatus in list is reversed,
801 * revert it back to proper order.
803 llnode
= llist_nodes_reverse(llnode
);
805 estatus_node
= llist_entry(llnode
, struct ghes_estatus_node
,
807 estatus
= GHES_ESTATUS_FROM_NODE(estatus_node
);
808 len
= apei_estatus_len(estatus
);
809 node_len
= GHES_ESTATUS_NODE_LEN(len
);
810 generic
= estatus_node
->generic
;
811 ghes_print_estatus(NULL
, generic
, estatus
);
812 llnode
= llnode
->next
;
816 static int ghes_notify_nmi(unsigned int cmd
, struct pt_regs
*regs
)
818 struct ghes
*ghes
, *ghes_global
= NULL
;
819 int sev
, sev_global
= -1;
822 raw_spin_lock(&ghes_nmi_lock
);
823 list_for_each_entry_rcu(ghes
, &ghes_nmi
, list
) {
824 if (ghes_read_estatus(ghes
, 1)) {
825 ghes_clear_estatus(ghes
);
828 sev
= ghes_severity(ghes
->estatus
->error_severity
);
829 if (sev
> sev_global
) {
839 if (sev_global
>= GHES_SEV_PANIC
) {
841 ghes_print_queued_estatus();
842 __ghes_print_estatus(KERN_EMERG
, ghes_global
->generic
,
843 ghes_global
->estatus
);
844 /* reboot to log the error! */
845 if (panic_timeout
== 0)
846 panic_timeout
= ghes_panic_timeout
;
847 panic("Fatal hardware error!");
850 list_for_each_entry_rcu(ghes
, &ghes_nmi
, list
) {
851 #ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
853 struct ghes_estatus_node
*estatus_node
;
854 struct acpi_hest_generic_status
*estatus
;
856 if (!(ghes
->flags
& GHES_TO_CLEAR
))
858 #ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
859 if (ghes_estatus_cached(ghes
->estatus
))
861 /* Save estatus for further processing in IRQ context */
862 len
= apei_estatus_len(ghes
->estatus
);
863 node_len
= GHES_ESTATUS_NODE_LEN(len
);
864 estatus_node
= (void *)gen_pool_alloc(ghes_estatus_pool
,
867 estatus_node
->generic
= ghes
->generic
;
868 estatus
= GHES_ESTATUS_FROM_NODE(estatus_node
);
869 memcpy(estatus
, ghes
->estatus
, len
);
870 llist_add(&estatus_node
->llnode
, &ghes_estatus_llist
);
874 ghes_clear_estatus(ghes
);
876 #ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
877 irq_work_queue(&ghes_proc_irq_work
);
881 raw_spin_unlock(&ghes_nmi_lock
);
885 static struct notifier_block ghes_notifier_sci
= {
886 .notifier_call
= ghes_notify_sci
,
889 static unsigned long ghes_esource_prealloc_size(
890 const struct acpi_hest_generic
*generic
)
892 unsigned long block_length
, prealloc_records
, prealloc_size
;
894 block_length
= min_t(unsigned long, generic
->error_block_length
,
895 GHES_ESTATUS_MAX_SIZE
);
896 prealloc_records
= max_t(unsigned long,
897 generic
->records_to_preallocate
, 1);
898 prealloc_size
= min_t(unsigned long, block_length
* prealloc_records
,
899 GHES_ESOURCE_PREALLOC_MAX_SIZE
);
901 return prealloc_size
;
904 static int ghes_probe(struct platform_device
*ghes_dev
)
906 struct acpi_hest_generic
*generic
;
907 struct ghes
*ghes
= NULL
;
911 generic
= *(struct acpi_hest_generic
**)ghes_dev
->dev
.platform_data
;
912 if (!generic
->enabled
)
915 switch (generic
->notify
.type
) {
916 case ACPI_HEST_NOTIFY_POLLED
:
917 case ACPI_HEST_NOTIFY_EXTERNAL
:
918 case ACPI_HEST_NOTIFY_SCI
:
919 case ACPI_HEST_NOTIFY_NMI
:
921 case ACPI_HEST_NOTIFY_LOCAL
:
922 pr_warning(GHES_PFX
"Generic hardware error source: %d notified via local interrupt is not supported!\n",
923 generic
->header
.source_id
);
926 pr_warning(FW_WARN GHES_PFX
"Unknown notification type: %u for generic hardware error source: %d\n",
927 generic
->notify
.type
, generic
->header
.source_id
);
932 if (generic
->error_block_length
<
933 sizeof(struct acpi_hest_generic_status
)) {
934 pr_warning(FW_BUG GHES_PFX
"Invalid error block length: %u for generic hardware error source: %d\n",
935 generic
->error_block_length
,
936 generic
->header
.source_id
);
939 ghes
= ghes_new(generic
);
945 switch (generic
->notify
.type
) {
946 case ACPI_HEST_NOTIFY_POLLED
:
947 ghes
->timer
.function
= ghes_poll_func
;
948 ghes
->timer
.data
= (unsigned long)ghes
;
949 init_timer_deferrable(&ghes
->timer
);
950 ghes_add_timer(ghes
);
952 case ACPI_HEST_NOTIFY_EXTERNAL
:
953 /* External interrupt vector is GSI */
954 if (acpi_gsi_to_irq(generic
->notify
.vector
, &ghes
->irq
)) {
955 pr_err(GHES_PFX
"Failed to map GSI to IRQ for generic hardware error source: %d\n",
956 generic
->header
.source_id
);
959 if (request_irq(ghes
->irq
, ghes_irq_func
,
960 0, "GHES IRQ", ghes
)) {
961 pr_err(GHES_PFX
"Failed to register IRQ for generic hardware error source: %d\n",
962 generic
->header
.source_id
);
966 case ACPI_HEST_NOTIFY_SCI
:
967 mutex_lock(&ghes_list_mutex
);
968 if (list_empty(&ghes_sci
))
969 register_acpi_hed_notifier(&ghes_notifier_sci
);
970 list_add_rcu(&ghes
->list
, &ghes_sci
);
971 mutex_unlock(&ghes_list_mutex
);
973 case ACPI_HEST_NOTIFY_NMI
:
974 len
= ghes_esource_prealloc_size(generic
);
975 ghes_estatus_pool_expand(len
);
976 mutex_lock(&ghes_list_mutex
);
977 if (list_empty(&ghes_nmi
))
978 register_nmi_handler(NMI_LOCAL
, ghes_notify_nmi
, 0,
980 list_add_rcu(&ghes
->list
, &ghes_nmi
);
981 mutex_unlock(&ghes_list_mutex
);
986 platform_set_drvdata(ghes_dev
, ghes
);
997 static int ghes_remove(struct platform_device
*ghes_dev
)
1000 struct acpi_hest_generic
*generic
;
1003 ghes
= platform_get_drvdata(ghes_dev
);
1004 generic
= ghes
->generic
;
1006 ghes
->flags
|= GHES_EXITING
;
1007 switch (generic
->notify
.type
) {
1008 case ACPI_HEST_NOTIFY_POLLED
:
1009 del_timer_sync(&ghes
->timer
);
1011 case ACPI_HEST_NOTIFY_EXTERNAL
:
1012 free_irq(ghes
->irq
, ghes
);
1014 case ACPI_HEST_NOTIFY_SCI
:
1015 mutex_lock(&ghes_list_mutex
);
1016 list_del_rcu(&ghes
->list
);
1017 if (list_empty(&ghes_sci
))
1018 unregister_acpi_hed_notifier(&ghes_notifier_sci
);
1019 mutex_unlock(&ghes_list_mutex
);
1021 case ACPI_HEST_NOTIFY_NMI
:
1022 mutex_lock(&ghes_list_mutex
);
1023 list_del_rcu(&ghes
->list
);
1024 if (list_empty(&ghes_nmi
))
1025 unregister_nmi_handler(NMI_LOCAL
, "ghes");
1026 mutex_unlock(&ghes_list_mutex
);
1028 * To synchronize with NMI handler, ghes can only be
1029 * freed after NMI handler finishes.
1032 len
= ghes_esource_prealloc_size(generic
);
1033 ghes_estatus_pool_shrink(len
);
1043 platform_set_drvdata(ghes_dev
, NULL
);
1048 static struct platform_driver ghes_platform_driver
= {
1051 .owner
= THIS_MODULE
,
1053 .probe
= ghes_probe
,
1054 .remove
= ghes_remove
,
1057 static int __init
ghes_init(void)
1065 pr_info(GHES_PFX
"HEST is not enabled!\n");
1070 pr_info(GHES_PFX
"GHES is not enabled!\n");
1074 init_irq_work(&ghes_proc_irq_work
, ghes_proc_in_irq
);
1076 rc
= ghes_ioremap_init();
1080 rc
= ghes_estatus_pool_init();
1082 goto err_ioremap_exit
;
1084 rc
= ghes_estatus_pool_expand(GHES_ESTATUS_CACHE_AVG_SIZE
*
1085 GHES_ESTATUS_CACHE_ALLOCED_MAX
);
1089 rc
= platform_driver_register(&ghes_platform_driver
);
1093 rc
= apei_osc_setup();
1094 if (rc
== 0 && osc_sb_apei_support_acked
)
1095 pr_info(GHES_PFX
"APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n");
1096 else if (rc
== 0 && !osc_sb_apei_support_acked
)
1097 pr_info(GHES_PFX
"APEI firmware first mode is enabled by WHEA _OSC.\n");
1098 else if (rc
&& osc_sb_apei_support_acked
)
1099 pr_info(GHES_PFX
"APEI firmware first mode is enabled by APEI bit.\n");
1101 pr_info(GHES_PFX
"Failed to enable APEI firmware first mode.\n");
1105 ghes_estatus_pool_exit();
1107 ghes_ioremap_exit();
1112 static void __exit
ghes_exit(void)
1114 platform_driver_unregister(&ghes_platform_driver
);
1115 ghes_estatus_pool_exit();
1116 ghes_ioremap_exit();
1119 module_init(ghes_init
);
1120 module_exit(ghes_exit
);
1122 MODULE_AUTHOR("Huang Ying");
1123 MODULE_DESCRIPTION("APEI Generic Hardware Error Source support");
1124 MODULE_LICENSE("GPL");
1125 MODULE_ALIAS("platform:GHES");