Author: marcel
Date: Sat Apr 4 22:01:43 2009
New Revision: 190701
URL: http://svn.freebsd.org/changeset/base/190701
Log:
Implement kernel core dump support for Book-E processors.
Both raw physical memory dumps and virtual minidumps are
supported. The default being minidumps.
Obtained from: Juniper Networks
Modified:
head/sys/powerpc/booke/pmap.c
Modified: head/sys/powerpc/booke/pmap.c
==============================================================================
--- head/sys/powerpc/booke/pmap.c Sat Apr 4 20:58:18 2009
(r190700)
+++ head/sys/powerpc/booke/pmap.c Sat Apr 4 22:01:43 2009
(r190701)
@@ -39,7 +39,7 @@
* 0x0000_0000 - 0xafff_ffff : user process
* 0xb000_0000 - 0xbfff_ffff : pmap_mapdev()-ed area (PCI/PCIE etc.)
* 0xc000_0000 - 0xc0ff_ffff : kernel reserved
- * 0xc000_0000 - kernelend : kernel code+data, env, metadata etc.
+ * 0xc000_0000 - data_end : kernel code+data, env, metadata etc.
* 0xc100_0000 - 0xfeef_ffff : KVA
* 0xc100_0000 - 0xc100_3fff : reserved for page zero/copy
* 0xc100_4000 - 0xc200_3fff : reserved for ptbl bufs
@@ -76,6 +76,7 @@ __FBSDID("$FreeBSD$");
#include <vm/vm_pager.h>
#include <vm/uma.h>
+#include <machine/bootinfo.h>
#include <machine/cpu.h>
#include <machine/pcb.h>
#include <machine/powerpc.h>
@@ -107,8 +108,19 @@ __FBSDID("$FreeBSD$");
#endif
extern struct mtx sched_lock;
+extern int dumpsys_minidump;
+
+extern unsigned char _etext[];
+extern unsigned char _end[];
+
/* Kernel physical load address. */
extern uint32_t kernload;
+vm_offset_t kernstart;
+vm_size_t kernsize;
+
+/* Message buffer and tables. */
+static vm_offset_t data_start;
+static vm_size_t data_end;
struct mem_region availmem_regions[MEM_REGIONS];
int availmem_regions_sz;
@@ -304,6 +316,11 @@ static void mmu_booke_kenter(mmu_t, vm_
static void mmu_booke_kremove(mmu_t, vm_offset_t);
static boolean_t mmu_booke_dev_direct_mapped(mmu_t, vm_offset_t,
vm_size_t);
static boolean_t mmu_booke_page_executable(mmu_t, vm_page_t);
+static vm_offset_t mmu_booke_dumpsys_map(mmu_t, struct pmap_md *,
+ vm_size_t, vm_size_t *);
+static void mmu_booke_dumpsys_unmap(mmu_t, struct pmap_md *,
+ vm_size_t, vm_offset_t);
+static struct pmap_md *mmu_booke_scan_md(mmu_t, struct pmap_md *);
static mmu_method_t mmu_booke_methods[] = {
/* pmap dispatcher interface */
@@ -352,6 +369,11 @@ static mmu_method_t mmu_booke_methods[]
MMUMETHOD(mmu_page_executable, mmu_booke_page_executable),
MMUMETHOD(mmu_unmapdev, mmu_booke_unmapdev),
+ /* dumpsys() support */
+ MMUMETHOD(mmu_dumpsys_map, mmu_booke_dumpsys_map),
+ MMUMETHOD(mmu_dumpsys_unmap, mmu_booke_dumpsys_unmap),
+ MMUMETHOD(mmu_scan_md, mmu_booke_scan_md),
+
{ 0, 0 }
};
@@ -884,7 +906,7 @@ pte_find(mmu_t mmu, pmap_t pmap, vm_offs
* This is called during e500_init, before the system is really initialized.
*/
static void
-mmu_booke_bootstrap(mmu_t mmu, vm_offset_t kernelstart, vm_offset_t kernelend)
+mmu_booke_bootstrap(mmu_t mmu, vm_offset_t start, vm_offset_t kernelend)
{
vm_offset_t phys_kernelend;
struct mem_region *mp, *mp1;
@@ -904,47 +926,52 @@ mmu_booke_bootstrap(mmu_t mmu, vm_offset
tlb0_get_tlbconf();
/* Align kernel start and end address (kernel image). */
- kernelstart = trunc_page(kernelstart);
- kernelend = round_page(kernelend);
+ kernstart = trunc_page(start);
+ data_start = round_page(kernelend);
+ kernsize = data_start - kernstart;
+
+ data_end = data_start;
/* Allocate space for the message buffer. */
- msgbufp = (struct msgbuf *)kernelend;
- kernelend += MSGBUF_SIZE;
+ msgbufp = (struct msgbuf *)data_end;
+ data_end += MSGBUF_SIZE;
debugf(" msgbufp at 0x%08x end = 0x%08x\n", (uint32_t)msgbufp,
- kernelend);
+ data_end);
- kernelend = round_page(kernelend);
+ data_end = round_page(data_end);
/* Allocate space for ptbl_bufs. */
- ptbl_bufs = (struct ptbl_buf *)kernelend;
- kernelend += sizeof(struct ptbl_buf) * PTBL_BUFS;
+ ptbl_bufs = (struct ptbl_buf *)data_end;
+ data_end += sizeof(struct ptbl_buf) * PTBL_BUFS;
debugf(" ptbl_bufs at 0x%08x end = 0x%08x\n", (uint32_t)ptbl_bufs,
- kernelend);
+ data_end);
- kernelend = round_page(kernelend);
+ data_end = round_page(data_end);
/* Allocate PTE tables for kernel KVA. */
- kernel_pdir = kernelend;
+ kernel_pdir = data_end;
kernel_ptbls = (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS +
PDIR_SIZE - 1) / PDIR_SIZE;
- kernelend += kernel_ptbls * PTBL_PAGES * PAGE_SIZE;
+ data_end += kernel_ptbls * PTBL_PAGES * PAGE_SIZE;
debugf(" kernel ptbls: %d\n", kernel_ptbls);
- debugf(" kernel pdir at 0x%08x end = 0x%08x\n", kernel_pdir, kernelend);
+ debugf(" kernel pdir at 0x%08x end = 0x%08x\n", kernel_pdir, data_end);
- debugf(" kernelend: 0x%08x\n", kernelend);
- if (kernelend - kernelstart > 0x1000000) {
- kernelend = (kernelend + 0x3fffff) & ~0x3fffff;
- tlb1_mapin_region(kernelstart + 0x1000000,
- kernload + 0x1000000, kernelend - kernelstart - 0x1000000);
+ debugf(" data_end: 0x%08x\n", data_end);
+ if (data_end - kernstart > 0x1000000) {
+ data_end = (data_end + 0x3fffff) & ~0x3fffff;
+ tlb1_mapin_region(kernstart + 0x1000000,
+ kernload + 0x1000000, data_end - kernstart - 0x1000000);
} else
- kernelend = (kernelend + 0xffffff) & ~0xffffff;
+ data_end = (data_end + 0xffffff) & ~0xffffff;
- debugf(" updated kernelend: 0x%08x\n", kernelend);
+ debugf(" updated data_end: 0x%08x\n", data_end);
+
+ kernsize += data_end - data_start;
/*
* Clear the structures - note we can only do it safely after the
* possible additional TLB1 translations are in place (above) so that
- * all range up to the currently calculated 'kernelend' is covered.
+ * all range up to the currently calculated 'data_end' is covered.
*/
memset((void *)ptbl_bufs, 0, sizeof(struct ptbl_buf) * PTBL_SIZE);
memset((void *)kernel_pdir, 0, kernel_ptbls * PTBL_PAGES * PAGE_SIZE);
@@ -952,7 +979,7 @@ mmu_booke_bootstrap(mmu_t mmu, vm_offset
/*******************************************************/
/* Set the start and end of kva. */
/*******************************************************/
- virtual_avail = kernelend;
+ virtual_avail = round_page(data_end);
virtual_end = VM_MAX_KERNEL_ADDRESS;
/* Allocate KVA space for page zero/copy operations. */
@@ -980,12 +1007,11 @@ mmu_booke_bootstrap(mmu_t mmu, vm_offset
ptbl_buf_pool_vabase, virtual_avail);
/* Calculate corresponding physical addresses for the kernel region. */
- phys_kernelend = kernload + (kernelend - kernelstart);
+ phys_kernelend = kernload + kernsize;
debugf("kernel image and allocated data:\n");
debugf(" kernload = 0x%08x\n", kernload);
- debugf(" kernelstart = 0x%08x\n", kernelstart);
- debugf(" kernelend = 0x%08x\n", kernelend);
- debugf(" kernel size = 0x%08x\n", kernelend - kernelstart);
+ debugf(" kernstart = 0x%08x\n", kernstart);
+ debugf(" kernsize = 0x%08x\n", kernsize);
if (sizeof(phys_avail) / sizeof(phys_avail[0]) < availmem_regions_sz)
panic("mmu_booke_bootstrap: phys_avail too small");
@@ -2287,6 +2313,140 @@ mmu_booke_dev_direct_mapped(mmu_t mmu, v
return (EFAULT);
}
+vm_offset_t
+mmu_booke_dumpsys_map(mmu_t mmu, struct pmap_md *md, vm_size_t ofs,
+ vm_size_t *sz)
+{
+ vm_paddr_t pa, ppa;
+ vm_offset_t va;
+ vm_size_t gran;
+
+ /* Raw physical memory dumps don't have a virtual address. */
+ if (md->md_vaddr == ~0UL) {
+ /* We always map a 256MB page at 256M. */
+ gran = 256 * 1024 * 1024;
+ pa = md->md_paddr + ofs;
+ ppa = pa & ~(gran - 1);
+ ofs = pa - ppa;
+ va = gran;
+ tlb1_set_entry(va, ppa, gran, _TLB_ENTRY_IO);
+ if (*sz > (gran - ofs))
+ *sz = gran - ofs;
+ return (va + ofs);
+ }
+
+ /* Minidumps are based on virtual memory addresses. */
+ va = md->md_vaddr + ofs;
+ if (va >= kernstart + kernsize) {
+ gran = PAGE_SIZE - (va & PAGE_MASK);
+ if (*sz > gran)
+ *sz = gran;
+ }
+ return (va);
+}
+
+void
+mmu_booke_dumpsys_unmap(mmu_t mmu, struct pmap_md *md, vm_size_t ofs,
+ vm_offset_t va)
+{
+
+ /* Raw physical memory dumps don't have a virtual address. */
+ if (md->md_vaddr == ~0UL) {
+ tlb1_idx--;
+ tlb1[tlb1_idx].mas1 = 0;
+ tlb1[tlb1_idx].mas2 = 0;
+ tlb1[tlb1_idx].mas3 = 0;
+ tlb1_write_entry(tlb1_idx);
+ return;
+ }
+
+ /* Minidumps are based on virtual memory addresses. */
+ /* Nothing to do... */
+}
+
+struct pmap_md *
+mmu_booke_scan_md(mmu_t mmu, struct pmap_md *prev)
+{
+ static struct pmap_md md;
+ struct bi_mem_region *mr;
+ pte_t *pte;
+ vm_offset_t va;
+
+ if (dumpsys_minidump) {
+ md.md_paddr = ~0UL; /* Minidumps use virtual addresses. */
+ if (prev == NULL) {
+ /* 1st: kernel .data and .bss. */
+ md.md_index = 1;
+ md.md_vaddr = trunc_page((uintptr_t)_etext);
+ md.md_size = round_page((uintptr_t)_end) - md.md_vaddr;
+ return (&md);
+ }
+ switch (prev->md_index) {
+ case 1:
+ /* 2nd: msgbuf and tables (see pmap_bootstrap()). */
+ md.md_index = 2;
+ md.md_vaddr = data_start;
+ md.md_size = data_end - data_start;
+ break;
+ case 2:
+ /* 3rd: kernel VM. */
+ va = prev->md_vaddr + prev->md_size;
+ /* Find start of next chunk (from va). */
+ while (va < virtual_end) {
+ /* Don't dump the buffer cache. */
+ if (va >= kmi.buffer_sva &&
+ va < kmi.buffer_eva) {
+ va = kmi.buffer_eva;
+ continue;
+ }
+ pte = pte_find(mmu, kernel_pmap, va);
+ if (pte != NULL && PTE_ISVALID(pte))
+ break;
+ va += PAGE_SIZE;
+ }
+ if (va < virtual_end) {
+ md.md_vaddr = va;
+ va += PAGE_SIZE;
+ /* Find last page in chunk. */
+ while (va < virtual_end) {
+ /* Don't run into the buffer cache. */
+ if (va == kmi.buffer_sva)
+ break;
+ pte = pte_find(mmu, kernel_pmap, va);
+ if (pte == NULL || !PTE_ISVALID(pte))
+ break;
+ va += PAGE_SIZE;
+ }
+ md.md_size = va - md.md_vaddr;
+ break;
+ }
+ md.md_index = 3;
+ /* FALLTHROUGH */
+ default:
+ return (NULL);
+ }
+ } else { /* minidumps */
+ mr = bootinfo_mr();
+ if (prev == NULL) {
+ /* first physical chunk. */
+ md.md_paddr = mr->mem_base;
+ md.md_size = mr->mem_size;
+ md.md_vaddr = ~0UL;
+ md.md_index = 1;
+ } else if (md.md_index < bootinfo->bi_mem_reg_no) {
+ md.md_paddr = mr[md.md_index].mem_base;
+ md.md_size = mr[md.md_index].mem_size;
+ md.md_vaddr = ~0UL;
+ md.md_index++;
+ } else {
+ /* There's no next physical chunk. */
+ return (NULL);
+ }
+ }
+
+ return (&md);
+}
+
/*
* Map a set of physical memory pages into the kernel virtual address space.
* Return a pointer to where it is mapped. This routine is intended to be used
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