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f-stack/freebsd/mips/mips/minidump_machdep.c

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/*-
* Copyright (c) 2010 Oleksandr Tymoshenko <gonzo@freebsd.org>
* Copyright (c) 2008 Semihalf, Grzegorz Bernacki
* All rights reserved.
*
* 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
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* from: FreeBSD: src/sys/arm/arm/minidump_machdep.c v214223
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#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 <vm/vm.h>
#include <vm/pmap.h>
#include <machine/atomic.h>
#include <machine/elf.h>
#include <machine/md_var.h>
#include <machine/vmparam.h>
#include <machine/minidump.h>
#include <machine/cache.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)
uint32_t *vm_page_dump;
int vm_page_dump_size;
static struct kerneldumpheader kdh;
static off_t dumplo;
static off_t origdumplo;
/* Handle chunked writes. */
static uint64_t counter, progress;
/* Just auxiliary bufffer */
static char tmpbuffer[PAGE_SIZE];
extern pd_entry_t *kernel_segmap;
CTASSERT(sizeof(*vm_page_dump) == 4);
static int
is_dumpable(vm_paddr_t pa)
{
int i;
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);
}
void
dump_add_page(vm_paddr_t pa)
{
int idx, bit;
pa >>= PAGE_SHIFT;
idx = pa >> 5; /* 2^5 = 32 */
bit = pa & 31;
atomic_set_int(&vm_page_dump[idx], 1ul << bit);
}
void
dump_drop_page(vm_paddr_t pa)
{
int idx, bit;
pa >>= PAGE_SHIFT;
idx = pa >> 5; /* 2^5 = 32 */
bit = pa & 31;
atomic_clear_int(&vm_page_dump[idx], 1ul << bit);
}
#define PG2MB(pgs) (((pgs) + (1 << 8) - 1) >> 8)
static int
write_buffer(struct dumperinfo *di, char *ptr, size_t sz)
{
size_t len;
int error, c;
u_int maxdumpsz;
maxdumpsz = di->maxiosize;
if (maxdumpsz == 0) /* seatbelt */
maxdumpsz = PAGE_SIZE;
error = 0;
while (sz) {
len = min(maxdumpsz, sz);
counter += len;
progress -= len;
if (counter >> 22) {
printf(" %jd", PG2MB(progress >> PAGE_SHIFT));
counter &= (1<<22) - 1;
}
if (ptr) {
error = dump_write(di, ptr, 0, dumplo, len);
if (error)
return (error);
dumplo += len;
ptr += len;
sz -= len;
} else {
panic("pa is not supported");
}
/* 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)
{
struct minidumphdr mdhdr;
uint64_t dumpsize;
uint32_t ptesize;
uint32_t bits;
vm_paddr_t pa;
vm_offset_t prev_pte = 0;
uint32_t count = 0;
vm_offset_t va;
pt_entry_t *pte;
int i, bit, error;
void *dump_va;
/* Flush cache */
mips_dcache_wbinv_all();
counter = 0;
/* Walk page table pages, set bits in vm_page_dump */
ptesize = 0;
for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
ptesize += PAGE_SIZE;
pte = pmap_pte(kernel_pmap, va);
KASSERT(pte != NULL, ("pte for %jx is NULL", (uintmax_t)va));
for (i = 0; i < NPTEPG; i++) {
if (pte_test(&pte[i], PTE_V)) {
pa = TLBLO_PTE_TO_PA(pte[i]);
if (is_dumpable(pa))
dump_add_page(pa);
}
}
}
/*
* Now mark pages from 0 to phys_avail[0], that's where kernel
* and pages allocated by pmap_steal reside
*/
for (pa = 0; pa < phys_avail[0]; pa += PAGE_SIZE) {
if (is_dumpable(pa))
dump_add_page(pa);
}
/* Calculate dump size. */
dumpsize = ptesize;
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 = ffs(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 = ENOSPC;
goto fail;
}
origdumplo = 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.ptesize = ptesize;
mdhdr.kernbase = VM_MIN_KERNEL_ADDRESS;
mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_MIPS_VERSION, dumpsize,
di->blocksize);
printf("Physical memory: %ju MB\n",
(uintmax_t)ptoa((uintmax_t)physmem) / 1048576);
printf("Dumping %llu MB:", (long long)dumpsize >> 20);
/* 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 = write_buffer(di, tmpbuffer, PAGE_SIZE);
if (error)
goto fail;
/* Dump msgbuf up front */
error = write_buffer(di, (char *)msgbufp->msg_ptr,
round_page(msgbufp->msg_size));
if (error)
goto fail;
/* Dump bitmap */
error = write_buffer(di, (char *)vm_page_dump,
round_page(vm_page_dump_size));
if (error)
goto fail;
/* Dump kernel page table pages */
for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
pte = pmap_pte(kernel_pmap, va);
KASSERT(pte != NULL, ("pte for %jx is NULL", (uintmax_t)va));
if (!count) {
prev_pte = (vm_offset_t)pte;
count++;
}
else {
if ((vm_offset_t)pte == (prev_pte + count * PAGE_SIZE))
count++;
else {
error = write_buffer(di, (char*)prev_pte,
count * PAGE_SIZE);
if (error)
goto fail;
count = 1;
prev_pte = (vm_offset_t)pte;
}
}
}
if (count) {
error = write_buffer(di, (char*)prev_pte, count * PAGE_SIZE);
if (error)
goto fail;
count = 0;
prev_pte = 0;
}
/* Dump memory chunks page by page*/
for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
bits = vm_page_dump[i];
while (bits) {
bit = ffs(bits) - 1;
pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
bit) * PAGE_SIZE;
dump_va = pmap_kenter_temporary(pa, 0);
error = write_buffer(di, dump_va, PAGE_SIZE);
if (error)
goto fail;
pmap_kenter_temporary_free(pa);
bits &= ~(1ul << bit);
}
}
/* 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;
if (error == ECANCELED)
printf("\nDump aborted\n");
else if (error == ENOSPC)
printf("\nDump failed. Partition too small.\n");
else
printf("\n** DUMP FAILED (ERROR %d) **\n", error);
return (error);
}
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