svn commit: r286958 - in head/sys: arm64/arm64 vm
Andrew Turner
andrew at FreeBSD.org
Thu Aug 20 12:49:58 UTC 2015
Author: andrew
Date: Thu Aug 20 12:49:56 2015
New Revision: 286958
URL: https://svnweb.freebsd.org/changeset/base/286958
Log:
Add the kernel support for minidumps on arm64.
Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3318
Modified:
head/sys/arm64/arm64/minidump_machdep.c
head/sys/arm64/arm64/uma_machdep.c
head/sys/vm/vm_page.c
Modified: head/sys/arm64/arm64/minidump_machdep.c
==============================================================================
--- head/sys/arm64/arm64/minidump_machdep.c Thu Aug 20 12:07:44 2015 (r286957)
+++ head/sys/arm64/arm64/minidump_machdep.c Thu Aug 20 12:49:56 2015 (r286958)
@@ -1,4 +1,5 @@
/*-
+ * Copyright (c) 2006 Peter Wemm
* Copyright (c) 2015 The FreeBSD Foundation
* All rights reserved.
*
@@ -8,6 +9,7 @@
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
+ *
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
@@ -32,19 +34,434 @@ __FBSDID("$FreeBSD$");
#include "opt_watchdog.h"
+#include "opt_watchdog.h"
+
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
+#include <sys/cons.h>
#include <sys/kernel.h>
#include <sys/kerneldump.h>
+#include <sys/msgbuf.h>
+#include <sys/watchdog.h>
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/vm_page.h>
+#include <vm/vm_phys.h>
+#include <vm/pmap.h>
#include <machine/md_var.h>
+#include <machine/pmap.h>
+#include <machine/pte.h>
+#include <machine/vmparam.h>
+#include <machine/minidump.h>
+
+CTASSERT(sizeof(struct kerneldumpheader) == 512);
+
+/*
+ * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
+ * is to protect us from metadata and to protect metadata from us.
+ */
+#define SIZEOF_METADATA (64*1024)
+
+uint64_t *vm_page_dump;
+int vm_page_dump_size;
+
+static struct kerneldumpheader kdh;
+static off_t dumplo;
+
+/* Handle chunked writes. */
+static size_t fragsz;
+static void *dump_va;
+static size_t counter, progress, dumpsize;
+
+static uint64_t tmpbuffer[PAGE_SIZE / sizeof(uint64_t)];
+
+CTASSERT(sizeof(*vm_page_dump) == 8);
+
+static int
+is_dumpable(vm_paddr_t pa)
+{
+ vm_page_t m;
+ int i;
+
+ if ((m = vm_phys_paddr_to_vm_page(pa)) != NULL)
+ return ((m->flags & PG_NODUMP) == 0);
+ for (i = 0; dump_avail[i] != 0 || dump_avail[i + 1] != 0; i += 2) {
+ if (pa >= dump_avail[i] && pa < dump_avail[i + 1])
+ return (1);
+ }
+ return (0);
+}
+
+static int
+blk_flush(struct dumperinfo *di)
+{
+ int error;
+
+ if (fragsz == 0)
+ return (0);
+
+ error = dump_write(di, dump_va, 0, dumplo, fragsz);
+ dumplo += fragsz;
+ fragsz = 0;
+ return (error);
+}
+
+static struct {
+ int min_per;
+ int max_per;
+ int visited;
+} progress_track[10] = {
+ { 0, 10, 0},
+ { 10, 20, 0},
+ { 20, 30, 0},
+ { 30, 40, 0},
+ { 40, 50, 0},
+ { 50, 60, 0},
+ { 60, 70, 0},
+ { 70, 80, 0},
+ { 80, 90, 0},
+ { 90, 100, 0}
+};
+
+static void
+report_progress(size_t progress, size_t dumpsize)
+{
+ int sofar, i;
+
+ sofar = 100 - ((progress * 100) / dumpsize);
+ for (i = 0; i < nitems(progress_track); i++) {
+ if (sofar < progress_track[i].min_per ||
+ sofar > progress_track[i].max_per)
+ continue;
+ if (progress_track[i].visited)
+ return;
+ progress_track[i].visited = 1;
+ printf("..%d%%", sofar);
+ return;
+ }
+}
+
+static int
+blk_write(struct dumperinfo *di, char *ptr, vm_paddr_t pa, size_t sz)
+{
+ size_t len;
+ int error, c;
+ u_int maxdumpsz;
+
+ maxdumpsz = min(di->maxiosize, MAXDUMPPGS * PAGE_SIZE);
+ if (maxdumpsz == 0) /* seatbelt */
+ maxdumpsz = PAGE_SIZE;
+ error = 0;
+ if ((sz % PAGE_SIZE) != 0) {
+ printf("size not page aligned\n");
+ return (EINVAL);
+ }
+ if (ptr != NULL && pa != 0) {
+ printf("cant have both va and pa!\n");
+ return (EINVAL);
+ }
+ if ((((uintptr_t)pa) % PAGE_SIZE) != 0) {
+ printf("address not page aligned %p\n", ptr);
+ return (EINVAL);
+ }
+ if (ptr != NULL) {
+ /*
+ * If we're doing a virtual dump, flush any
+ * pre-existing pa pages.
+ */
+ error = blk_flush(di);
+ if (error)
+ return (error);
+ }
+ while (sz) {
+ len = maxdumpsz - fragsz;
+ if (len > sz)
+ len = sz;
+ counter += len;
+ progress -= len;
+ if (counter >> 22) {
+ report_progress(progress, dumpsize);
+ counter &= (1 << 22) - 1;
+ }
+
+ wdog_kern_pat(WD_LASTVAL);
+
+ if (ptr) {
+ error = dump_write(di, ptr, 0, dumplo, len);
+ if (error)
+ return (error);
+ dumplo += len;
+ ptr += len;
+ sz -= len;
+ } else {
+ dump_va = (void *)PHYS_TO_DMAP(pa);
+ fragsz += len;
+ pa += len;
+ sz -= len;
+ error = blk_flush(di);
+ if (error)
+ return (error);
+ }
+
+ /* Check for user abort. */
+ c = cncheckc();
+ if (c == 0x03)
+ return (ECANCELED);
+ if (c != -1)
+ printf(" (CTRL-C to abort) ");
+ }
+
+ return (0);
+}
int
minidumpsys(struct dumperinfo *di)
{
+ pd_entry_t *l1, *l2;
+ pt_entry_t *l3;
+ uint32_t pmapsize;
+ vm_offset_t va;
+ vm_paddr_t pa;
+ int error;
+ uint64_t bits;
+ int i, bit;
+ int retry_count;
+ struct minidumphdr mdhdr;
+
+ retry_count = 0;
+ retry:
+ retry_count++;
+ error = 0;
+ pmapsize = 0;
+ for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += L2_SIZE) {
+ pmapsize += PAGE_SIZE;
+ if (!pmap_get_tables(pmap_kernel(), va, &l1, &l2, &l3))
+ continue;
+
+ /* We should always be using the l2 table for kvm */
+ if (l2 == NULL)
+ continue;
+
+ if ((*l2 & ATTR_DESCR_MASK) == L2_BLOCK) {
+ pa = *l2 & ~ATTR_MASK;
+ for (i = 0; i < Ln_ENTRIES; i++, pa += PAGE_SIZE) {
+ if (is_dumpable(pa))
+ dump_add_page(pa);
+ }
+ } else if ((*l2 & ATTR_DESCR_MASK) == L2_TABLE) {
+ for (i = 0; i < Ln_ENTRIES; i++) {
+ if ((l3[i] & ATTR_DESCR_MASK) != L3_PAGE)
+ continue;
+ pa = l3[i] & ~ATTR_MASK;
+ if (is_dumpable(pa))
+ dump_add_page(pa);
+ }
+ }
+ }
+
+ /* Calculate dump size. */
+ dumpsize = pmapsize;
+ dumpsize += round_page(msgbufp->msg_size);
+ dumpsize += round_page(vm_page_dump_size);
+ for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
+ bits = vm_page_dump[i];
+ while (bits) {
+ bit = ffsl(bits) - 1;
+ pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
+ bit) * PAGE_SIZE;
+ /* Clear out undumpable pages now if needed */
+ if (is_dumpable(pa))
+ dumpsize += PAGE_SIZE;
+ else
+ dump_drop_page(pa);
+ bits &= ~(1ul << bit);
+ }
+ }
+ dumpsize += PAGE_SIZE;
+
+ /* Determine dump offset on device. */
+ if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
+ error = E2BIG;
+ goto fail;
+ }
+ dumplo = di->mediaoffset + di->mediasize - dumpsize;
+ dumplo -= sizeof(kdh) * 2;
+ progress = dumpsize;
+
+ /* Initialize mdhdr */
+ bzero(&mdhdr, sizeof(mdhdr));
+ strcpy(mdhdr.magic, MINIDUMP_MAGIC);
+ mdhdr.version = MINIDUMP_VERSION;
+ mdhdr.msgbufsize = msgbufp->msg_size;
+ mdhdr.bitmapsize = vm_page_dump_size;
+ mdhdr.pmapsize = pmapsize;
+ mdhdr.kernbase = VM_MIN_KERNEL_ADDRESS;
+ mdhdr.dmapphys = DMAP_MIN_PHYSADDR;
+ mdhdr.dmapbase = DMAP_MIN_ADDRESS;
+ mdhdr.dmapend = DMAP_MAX_ADDRESS;
+
+ mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_AARCH64_VERSION,
+ dumpsize, di->blocksize);
+
+ printf("Dumping %llu out of %ju MB:", (long long)dumpsize >> 20,
+ ptoa((uintmax_t)physmem) / 1048576);
+
+ /* Dump leader */
+ error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
+ if (error)
+ goto fail;
+ dumplo += sizeof(kdh);
+
+ /* Dump my header */
+ bzero(&tmpbuffer, sizeof(tmpbuffer));
+ bcopy(&mdhdr, &tmpbuffer, sizeof(mdhdr));
+ error = blk_write(di, (char *)&tmpbuffer, 0, PAGE_SIZE);
+ if (error)
+ goto fail;
+
+ /* Dump msgbuf up front */
+ error = blk_write(di, (char *)msgbufp->msg_ptr, 0,
+ round_page(msgbufp->msg_size));
+ if (error)
+ goto fail;
+
+ /* Dump bitmap */
+ error = blk_write(di, (char *)vm_page_dump, 0,
+ round_page(vm_page_dump_size));
+ if (error)
+ goto fail;
+
+ /* Dump kernel page directory pages */
+ bzero(&tmpbuffer, sizeof(tmpbuffer));
+ for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += L2_SIZE) {
+ if (!pmap_get_tables(pmap_kernel(), va, &l1, &l2, &l3)) {
+ /* We always write a page, even if it is zero */
+ error = blk_write(di, (char *)&tmpbuffer, 0, PAGE_SIZE);
+ if (error)
+ goto fail;
+ /* flush, in case we reuse tmpbuffer in the same block*/
+ error = blk_flush(di);
+ if (error)
+ goto fail;
+ } else if (l2 == NULL) {
+ pa = (*l1 & ~ATTR_MASK) | (va & L1_OFFSET);
- printf("minidumpsys\n");
- while (1);
+ /* Generate fake l3 entries based upon the l1 entry */
+ for (i = 0; i < Ln_ENTRIES; i++) {
+ tmpbuffer[i] = pa + (i * PAGE_SIZE) |
+ ATTR_DEFAULT | L3_PAGE;
+ }
+ /* We always write a page, even if it is zero */
+ error = blk_write(di, (char *)&tmpbuffer, 0, PAGE_SIZE);
+ if (error)
+ goto fail;
+ /* flush, in case we reuse tmpbuffer in the same block*/
+ error = blk_flush(di);
+ if (error)
+ goto fail;
+ bzero(&tmpbuffer, sizeof(tmpbuffer));
+ } else if ((*l2 & ATTR_DESCR_MASK) == L2_BLOCK) {
+ /* TODO: Handle an invalid L2 entry */
+ pa = (*l2 & ~ATTR_MASK) | (va & L2_OFFSET);
+
+ /* Generate fake l3 entries based upon the l1 entry */
+ for (i = 0; i < Ln_ENTRIES; i++) {
+ tmpbuffer[i] = pa + (i * PAGE_SIZE) |
+ ATTR_DEFAULT | L3_PAGE;
+ }
+ /* We always write a page, even if it is zero */
+ error = blk_write(di, (char *)&tmpbuffer, 0, PAGE_SIZE);
+ if (error)
+ goto fail;
+ /* flush, in case we reuse fakepd in the same block */
+ error = blk_flush(di);
+ if (error)
+ goto fail;
+ bzero(&tmpbuffer, sizeof(tmpbuffer));
+ continue;
+ } else {
+ pa = *l2 & ~ATTR_MASK;
+
+ /* We always write a page, even if it is zero */
+ error = blk_write(di, NULL, pa, PAGE_SIZE);
+ if (error)
+ goto fail;
+ }
+ }
+
+ /* Dump memory chunks */
+ /* XXX cluster it up and use blk_dump() */
+ for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
+ bits = vm_page_dump[i];
+ while (bits) {
+ bit = ffsl(bits) - 1;
+ pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
+ bit) * PAGE_SIZE;
+ error = blk_write(di, 0, pa, PAGE_SIZE);
+ if (error)
+ goto fail;
+ bits &= ~(1ul << bit);
+ }
+ }
+
+ error = blk_flush(di);
+ if (error)
+ goto fail;
+
+ /* Dump trailer */
+ error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
+ if (error)
+ goto fail;
+ dumplo += sizeof(kdh);
+
+ /* Signal completion, signoff and exit stage left. */
+ dump_write(di, NULL, 0, 0, 0);
+ printf("\nDump complete\n");
+ return (0);
+
+ fail:
+ if (error < 0)
+ error = -error;
+
+ printf("\n");
+ if (error == ENOSPC) {
+ printf("Dump map grown while dumping. ");
+ if (retry_count < 5) {
+ printf("Retrying...\n");
+ goto retry;
+ }
+ printf("Dump failed.\n");
+ }
+ else if (error == ECANCELED)
+ printf("Dump aborted\n");
+ else if (error == E2BIG)
+ printf("Dump failed. Partition too small.\n");
+ else
+ printf("** DUMP FAILED (ERROR %d) **\n", error);
+ return (error);
}
+void
+dump_add_page(vm_paddr_t pa)
+{
+ int idx, bit;
+
+ pa >>= PAGE_SHIFT;
+ idx = pa >> 6; /* 2^6 = 64 */
+ bit = pa & 63;
+ atomic_set_long(&vm_page_dump[idx], 1ul << bit);
+}
+
+void
+dump_drop_page(vm_paddr_t pa)
+{
+ int idx, bit;
+
+ pa >>= PAGE_SHIFT;
+ idx = pa >> 6; /* 2^6 = 64 */
+ bit = pa & 63;
+ atomic_clear_long(&vm_page_dump[idx], 1ul << bit);
+}
Modified: head/sys/arm64/arm64/uma_machdep.c
==============================================================================
--- head/sys/arm64/arm64/uma_machdep.c Thu Aug 20 12:07:44 2015 (r286957)
+++ head/sys/arm64/arm64/uma_machdep.c Thu Aug 20 12:49:56 2015 (r286958)
@@ -61,6 +61,8 @@ uma_small_alloc(uma_zone_t zone, vm_size
break;
}
pa = m->phys_addr;
+ if ((wait & M_NODUMP) == 0)
+ dump_add_page(pa);
va = (void *)PHYS_TO_DMAP(pa);
if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
bzero(va, PAGE_SIZE);
@@ -74,6 +76,7 @@ uma_small_free(void *mem, vm_size_t size
vm_paddr_t pa;
pa = DMAP_TO_PHYS((vm_offset_t)mem);
+ dump_drop_page(pa);
m = PHYS_TO_VM_PAGE(pa);
m->wire_count--;
vm_page_free(m);
Modified: head/sys/vm/vm_page.c
==============================================================================
--- head/sys/vm/vm_page.c Thu Aug 20 12:07:44 2015 (r286957)
+++ head/sys/vm/vm_page.c Thu Aug 20 12:49:56 2015 (r286958)
@@ -479,8 +479,8 @@ vm_page_startup(vm_offset_t vaddr)
bzero((void *)mapped, end - new_end);
uma_startup((void *)mapped, boot_pages);
-#if defined(__amd64__) || defined(__i386__) || defined(__arm__) || \
- defined(__mips__)
+#if defined(__aarch64__) || defined(__amd64__) || defined(__arm__) || \
+ defined(__i386__) || defined(__mips__)
/*
* Allocate a bitmap to indicate that a random physical page
* needs to be included in a minidump.
@@ -557,12 +557,12 @@ vm_page_startup(vm_offset_t vaddr)
*/
new_end = vm_reserv_startup(&vaddr, new_end, high_water);
#endif
-#if defined(__amd64__) || defined(__mips__)
+#if defined(__aarch64__) || defined(__amd64__) || defined(__mips__)
/*
- * pmap_map on amd64 and mips can come out of the direct-map, not kvm
- * like i386, so the pages must be tracked for a crashdump to include
- * this data. This includes the vm_page_array and the early UMA
- * bootstrap pages.
+ * pmap_map on arm64, amd64, and mips can come out of the direct-map,
+ * not kvm like i386, so the pages must be tracked for a crashdump to
+ * include this data. This includes the vm_page_array and the early
+ * UMA bootstrap pages.
*/
for (pa = new_end; pa < phys_avail[biggestone + 1]; pa += PAGE_SIZE)
dump_add_page(pa);
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