![Michael Holzheu](/assets/img/avatar_default.png)
Currently we have hardcoded the HSA size to 32 MiB. With this patch the HSA size is determined dynamically via SCLP in early.c. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
653 lines
15 KiB
C
653 lines
15 KiB
C
/*
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* S390 kdump implementation
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*
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* Copyright IBM Corp. 2011
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* Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
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*/
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#include <linux/crash_dump.h>
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#include <asm/lowcore.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/gfp.h>
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#include <linux/slab.h>
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#include <linux/bootmem.h>
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#include <linux/elf.h>
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#include <asm/os_info.h>
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#include <asm/elf.h>
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#include <asm/ipl.h>
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#include <asm/sclp.h>
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#define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y)))
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#define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y)))
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#define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y))))
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struct dump_save_areas dump_save_areas;
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/*
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* Allocate and add a save area for a CPU
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*/
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struct save_area *dump_save_area_create(int cpu)
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{
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struct save_area **save_areas, *save_area;
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save_area = kmalloc(sizeof(*save_area), GFP_KERNEL);
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if (!save_area)
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return NULL;
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if (cpu + 1 > dump_save_areas.count) {
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dump_save_areas.count = cpu + 1;
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save_areas = krealloc(dump_save_areas.areas,
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dump_save_areas.count * sizeof(void *),
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GFP_KERNEL | __GFP_ZERO);
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if (!save_areas) {
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kfree(save_area);
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return NULL;
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}
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dump_save_areas.areas = save_areas;
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}
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dump_save_areas.areas[cpu] = save_area;
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return save_area;
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}
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/*
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* Return physical address for virtual address
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*/
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static inline void *load_real_addr(void *addr)
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{
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unsigned long real_addr;
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asm volatile(
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" lra %0,0(%1)\n"
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" jz 0f\n"
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" la %0,0\n"
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"0:"
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: "=a" (real_addr) : "a" (addr) : "cc");
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return (void *)real_addr;
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}
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/*
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* Copy real to virtual or real memory
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*/
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static int copy_from_realmem(void *dest, void *src, size_t count)
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{
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unsigned long size;
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if (!count)
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return 0;
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if (!is_vmalloc_or_module_addr(dest))
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return memcpy_real(dest, src, count);
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do {
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size = min(count, PAGE_SIZE - (__pa(dest) & ~PAGE_MASK));
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if (memcpy_real(load_real_addr(dest), src, size))
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return -EFAULT;
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count -= size;
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dest += size;
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src += size;
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} while (count);
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return 0;
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}
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/*
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* Pointer to ELF header in new kernel
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*/
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static void *elfcorehdr_newmem;
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/*
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* Copy one page from zfcpdump "oldmem"
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*
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* For pages below HSA size memory from the HSA is copied. Otherwise
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* real memory copy is used.
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*/
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static ssize_t copy_oldmem_page_zfcpdump(char *buf, size_t csize,
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unsigned long src, int userbuf)
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{
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int rc;
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if (src < sclp_get_hsa_size()) {
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rc = memcpy_hsa(buf, src, csize, userbuf);
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} else {
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if (userbuf)
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rc = copy_to_user_real((void __force __user *) buf,
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(void *) src, csize);
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else
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rc = memcpy_real(buf, (void *) src, csize);
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}
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return rc ? rc : csize;
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}
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/*
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* Copy one page from kdump "oldmem"
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*
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* For the kdump reserved memory this functions performs a swap operation:
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* - [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] is mapped to [0 - OLDMEM_SIZE].
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* - [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE]
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*/
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static ssize_t copy_oldmem_page_kdump(char *buf, size_t csize,
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unsigned long src, int userbuf)
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{
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int rc;
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if (src < OLDMEM_SIZE)
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src += OLDMEM_BASE;
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else if (src > OLDMEM_BASE &&
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src < OLDMEM_BASE + OLDMEM_SIZE)
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src -= OLDMEM_BASE;
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if (userbuf)
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rc = copy_to_user_real((void __force __user *) buf,
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(void *) src, csize);
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else
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rc = copy_from_realmem(buf, (void *) src, csize);
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return (rc == 0) ? rc : csize;
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}
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/*
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* Copy one page from "oldmem"
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*/
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ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
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unsigned long offset, int userbuf)
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{
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unsigned long src;
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if (!csize)
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return 0;
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src = (pfn << PAGE_SHIFT) + offset;
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if (OLDMEM_BASE)
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return copy_oldmem_page_kdump(buf, csize, src, userbuf);
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else
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return copy_oldmem_page_zfcpdump(buf, csize, src, userbuf);
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}
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/*
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* Remap "oldmem" for kdump
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*
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* For the kdump reserved memory this functions performs a swap operation:
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* [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE]
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*/
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static int remap_oldmem_pfn_range_kdump(struct vm_area_struct *vma,
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unsigned long from, unsigned long pfn,
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unsigned long size, pgprot_t prot)
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{
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unsigned long size_old;
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int rc;
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if (pfn < OLDMEM_SIZE >> PAGE_SHIFT) {
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size_old = min(size, OLDMEM_SIZE - (pfn << PAGE_SHIFT));
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rc = remap_pfn_range(vma, from,
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pfn + (OLDMEM_BASE >> PAGE_SHIFT),
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size_old, prot);
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if (rc || size == size_old)
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return rc;
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size -= size_old;
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from += size_old;
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pfn += size_old >> PAGE_SHIFT;
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}
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return remap_pfn_range(vma, from, pfn, size, prot);
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}
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/*
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* Remap "oldmem" for zfcpdump
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*
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* We only map available memory above HSA size. Memory below HSA size
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* is read on demand using the copy_oldmem_page() function.
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*/
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static int remap_oldmem_pfn_range_zfcpdump(struct vm_area_struct *vma,
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unsigned long from,
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unsigned long pfn,
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unsigned long size, pgprot_t prot)
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{
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unsigned long hsa_end = sclp_get_hsa_size();
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unsigned long size_hsa;
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if (pfn < hsa_end >> PAGE_SHIFT) {
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size_hsa = min(size, hsa_end - (pfn << PAGE_SHIFT));
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if (size == size_hsa)
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return 0;
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size -= size_hsa;
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from += size_hsa;
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pfn += size_hsa >> PAGE_SHIFT;
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}
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return remap_pfn_range(vma, from, pfn, size, prot);
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}
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/*
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* Remap "oldmem" for kdump or zfcpdump
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*/
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int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from,
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unsigned long pfn, unsigned long size, pgprot_t prot)
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{
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if (OLDMEM_BASE)
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return remap_oldmem_pfn_range_kdump(vma, from, pfn, size, prot);
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else
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return remap_oldmem_pfn_range_zfcpdump(vma, from, pfn, size,
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prot);
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}
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/*
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* Copy memory from old kernel
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*/
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int copy_from_oldmem(void *dest, void *src, size_t count)
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{
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unsigned long copied = 0;
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int rc;
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if (OLDMEM_BASE) {
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if ((unsigned long) src < OLDMEM_SIZE) {
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copied = min(count, OLDMEM_SIZE - (unsigned long) src);
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rc = copy_from_realmem(dest, src + OLDMEM_BASE, copied);
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if (rc)
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return rc;
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}
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} else {
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unsigned long hsa_end = sclp_get_hsa_size();
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if ((unsigned long) src < hsa_end) {
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copied = min(count, hsa_end - (unsigned long) src);
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rc = memcpy_hsa(dest, (unsigned long) src, copied, 0);
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if (rc)
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return rc;
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}
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}
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return copy_from_realmem(dest + copied, src + copied, count - copied);
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}
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/*
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* Alloc memory and panic in case of ENOMEM
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*/
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static void *kzalloc_panic(int len)
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{
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void *rc;
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rc = kzalloc(len, GFP_KERNEL);
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if (!rc)
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panic("s390 kdump kzalloc (%d) failed", len);
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return rc;
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}
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/*
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* Get memory layout and create hole for oldmem
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*/
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static struct mem_chunk *get_memory_layout(void)
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{
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struct mem_chunk *chunk_array;
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chunk_array = kzalloc_panic(MEMORY_CHUNKS * sizeof(struct mem_chunk));
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detect_memory_layout(chunk_array, 0);
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create_mem_hole(chunk_array, OLDMEM_BASE, OLDMEM_SIZE);
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return chunk_array;
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}
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/*
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* Initialize ELF note
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*/
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static void *nt_init(void *buf, Elf64_Word type, void *desc, int d_len,
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const char *name)
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{
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Elf64_Nhdr *note;
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u64 len;
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note = (Elf64_Nhdr *)buf;
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note->n_namesz = strlen(name) + 1;
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note->n_descsz = d_len;
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note->n_type = type;
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len = sizeof(Elf64_Nhdr);
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memcpy(buf + len, name, note->n_namesz);
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len = roundup(len + note->n_namesz, 4);
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memcpy(buf + len, desc, note->n_descsz);
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len = roundup(len + note->n_descsz, 4);
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return PTR_ADD(buf, len);
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}
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/*
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* Initialize prstatus note
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*/
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static void *nt_prstatus(void *ptr, struct save_area *sa)
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{
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struct elf_prstatus nt_prstatus;
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static int cpu_nr = 1;
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memset(&nt_prstatus, 0, sizeof(nt_prstatus));
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memcpy(&nt_prstatus.pr_reg.gprs, sa->gp_regs, sizeof(sa->gp_regs));
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memcpy(&nt_prstatus.pr_reg.psw, sa->psw, sizeof(sa->psw));
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memcpy(&nt_prstatus.pr_reg.acrs, sa->acc_regs, sizeof(sa->acc_regs));
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nt_prstatus.pr_pid = cpu_nr;
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cpu_nr++;
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return nt_init(ptr, NT_PRSTATUS, &nt_prstatus, sizeof(nt_prstatus),
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"CORE");
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}
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/*
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* Initialize fpregset (floating point) note
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*/
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static void *nt_fpregset(void *ptr, struct save_area *sa)
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{
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elf_fpregset_t nt_fpregset;
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memset(&nt_fpregset, 0, sizeof(nt_fpregset));
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memcpy(&nt_fpregset.fpc, &sa->fp_ctrl_reg, sizeof(sa->fp_ctrl_reg));
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memcpy(&nt_fpregset.fprs, &sa->fp_regs, sizeof(sa->fp_regs));
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return nt_init(ptr, NT_PRFPREG, &nt_fpregset, sizeof(nt_fpregset),
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"CORE");
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}
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/*
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* Initialize timer note
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*/
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static void *nt_s390_timer(void *ptr, struct save_area *sa)
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{
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return nt_init(ptr, NT_S390_TIMER, &sa->timer, sizeof(sa->timer),
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KEXEC_CORE_NOTE_NAME);
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}
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/*
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* Initialize TOD clock comparator note
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*/
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static void *nt_s390_tod_cmp(void *ptr, struct save_area *sa)
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{
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return nt_init(ptr, NT_S390_TODCMP, &sa->clk_cmp,
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sizeof(sa->clk_cmp), KEXEC_CORE_NOTE_NAME);
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}
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/*
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* Initialize TOD programmable register note
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*/
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static void *nt_s390_tod_preg(void *ptr, struct save_area *sa)
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{
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return nt_init(ptr, NT_S390_TODPREG, &sa->tod_reg,
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sizeof(sa->tod_reg), KEXEC_CORE_NOTE_NAME);
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}
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/*
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* Initialize control register note
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*/
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static void *nt_s390_ctrs(void *ptr, struct save_area *sa)
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{
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return nt_init(ptr, NT_S390_CTRS, &sa->ctrl_regs,
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sizeof(sa->ctrl_regs), KEXEC_CORE_NOTE_NAME);
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}
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/*
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* Initialize prefix register note
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*/
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static void *nt_s390_prefix(void *ptr, struct save_area *sa)
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{
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return nt_init(ptr, NT_S390_PREFIX, &sa->pref_reg,
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sizeof(sa->pref_reg), KEXEC_CORE_NOTE_NAME);
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}
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/*
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* Fill ELF notes for one CPU with save area registers
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*/
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void *fill_cpu_elf_notes(void *ptr, struct save_area *sa)
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{
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ptr = nt_prstatus(ptr, sa);
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ptr = nt_fpregset(ptr, sa);
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ptr = nt_s390_timer(ptr, sa);
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ptr = nt_s390_tod_cmp(ptr, sa);
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ptr = nt_s390_tod_preg(ptr, sa);
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ptr = nt_s390_ctrs(ptr, sa);
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ptr = nt_s390_prefix(ptr, sa);
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return ptr;
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}
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/*
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* Initialize prpsinfo note (new kernel)
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*/
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static void *nt_prpsinfo(void *ptr)
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{
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struct elf_prpsinfo prpsinfo;
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memset(&prpsinfo, 0, sizeof(prpsinfo));
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prpsinfo.pr_sname = 'R';
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strcpy(prpsinfo.pr_fname, "vmlinux");
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return nt_init(ptr, NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo),
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KEXEC_CORE_NOTE_NAME);
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}
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/*
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* Get vmcoreinfo using lowcore->vmcore_info (new kernel)
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*/
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static void *get_vmcoreinfo_old(unsigned long *size)
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{
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char nt_name[11], *vmcoreinfo;
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Elf64_Nhdr note;
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void *addr;
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if (copy_from_oldmem(&addr, &S390_lowcore.vmcore_info, sizeof(addr)))
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return NULL;
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memset(nt_name, 0, sizeof(nt_name));
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if (copy_from_oldmem(¬e, addr, sizeof(note)))
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return NULL;
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if (copy_from_oldmem(nt_name, addr + sizeof(note), sizeof(nt_name) - 1))
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return NULL;
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if (strcmp(nt_name, "VMCOREINFO") != 0)
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return NULL;
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vmcoreinfo = kzalloc_panic(note.n_descsz);
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if (copy_from_oldmem(vmcoreinfo, addr + 24, note.n_descsz))
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return NULL;
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*size = note.n_descsz;
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return vmcoreinfo;
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}
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/*
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* Initialize vmcoreinfo note (new kernel)
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*/
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static void *nt_vmcoreinfo(void *ptr)
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{
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unsigned long size;
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void *vmcoreinfo;
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vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size);
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if (!vmcoreinfo)
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vmcoreinfo = get_vmcoreinfo_old(&size);
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if (!vmcoreinfo)
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return ptr;
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return nt_init(ptr, 0, vmcoreinfo, size, "VMCOREINFO");
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}
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/*
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* Initialize ELF header (new kernel)
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*/
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static void *ehdr_init(Elf64_Ehdr *ehdr, int mem_chunk_cnt)
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{
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memset(ehdr, 0, sizeof(*ehdr));
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memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
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ehdr->e_ident[EI_CLASS] = ELFCLASS64;
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ehdr->e_ident[EI_DATA] = ELFDATA2MSB;
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ehdr->e_ident[EI_VERSION] = EV_CURRENT;
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memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD);
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ehdr->e_type = ET_CORE;
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ehdr->e_machine = EM_S390;
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ehdr->e_version = EV_CURRENT;
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ehdr->e_phoff = sizeof(Elf64_Ehdr);
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ehdr->e_ehsize = sizeof(Elf64_Ehdr);
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ehdr->e_phentsize = sizeof(Elf64_Phdr);
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ehdr->e_phnum = mem_chunk_cnt + 1;
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return ehdr + 1;
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}
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/*
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* Return CPU count for ELF header (new kernel)
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*/
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static int get_cpu_cnt(void)
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{
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int i, cpus = 0;
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for (i = 0; i < dump_save_areas.count; i++) {
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if (dump_save_areas.areas[i]->pref_reg == 0)
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continue;
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cpus++;
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}
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return cpus;
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}
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/*
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* Return memory chunk count for ELF header (new kernel)
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*/
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static int get_mem_chunk_cnt(void)
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{
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struct mem_chunk *chunk_array, *mem_chunk;
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int i, cnt = 0;
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chunk_array = get_memory_layout();
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for (i = 0; i < MEMORY_CHUNKS; i++) {
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mem_chunk = &chunk_array[i];
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if (chunk_array[i].type != CHUNK_READ_WRITE &&
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chunk_array[i].type != CHUNK_READ_ONLY)
|
|
continue;
|
|
if (mem_chunk->size == 0)
|
|
continue;
|
|
cnt++;
|
|
}
|
|
kfree(chunk_array);
|
|
return cnt;
|
|
}
|
|
|
|
/*
|
|
* Initialize ELF loads (new kernel)
|
|
*/
|
|
static int loads_init(Elf64_Phdr *phdr, u64 loads_offset)
|
|
{
|
|
struct mem_chunk *chunk_array, *mem_chunk;
|
|
int i;
|
|
|
|
chunk_array = get_memory_layout();
|
|
for (i = 0; i < MEMORY_CHUNKS; i++) {
|
|
mem_chunk = &chunk_array[i];
|
|
if (mem_chunk->size == 0)
|
|
continue;
|
|
if (chunk_array[i].type != CHUNK_READ_WRITE &&
|
|
chunk_array[i].type != CHUNK_READ_ONLY)
|
|
continue;
|
|
else
|
|
phdr->p_filesz = mem_chunk->size;
|
|
phdr->p_type = PT_LOAD;
|
|
phdr->p_offset = mem_chunk->addr;
|
|
phdr->p_vaddr = mem_chunk->addr;
|
|
phdr->p_paddr = mem_chunk->addr;
|
|
phdr->p_memsz = mem_chunk->size;
|
|
phdr->p_flags = PF_R | PF_W | PF_X;
|
|
phdr->p_align = PAGE_SIZE;
|
|
phdr++;
|
|
}
|
|
kfree(chunk_array);
|
|
return i;
|
|
}
|
|
|
|
/*
|
|
* Initialize notes (new kernel)
|
|
*/
|
|
static void *notes_init(Elf64_Phdr *phdr, void *ptr, u64 notes_offset)
|
|
{
|
|
struct save_area *sa;
|
|
void *ptr_start = ptr;
|
|
int i;
|
|
|
|
ptr = nt_prpsinfo(ptr);
|
|
|
|
for (i = 0; i < dump_save_areas.count; i++) {
|
|
sa = dump_save_areas.areas[i];
|
|
if (sa->pref_reg == 0)
|
|
continue;
|
|
ptr = fill_cpu_elf_notes(ptr, sa);
|
|
}
|
|
ptr = nt_vmcoreinfo(ptr);
|
|
memset(phdr, 0, sizeof(*phdr));
|
|
phdr->p_type = PT_NOTE;
|
|
phdr->p_offset = notes_offset;
|
|
phdr->p_filesz = (unsigned long) PTR_SUB(ptr, ptr_start);
|
|
phdr->p_memsz = phdr->p_filesz;
|
|
return ptr;
|
|
}
|
|
|
|
/*
|
|
* Create ELF core header (new kernel)
|
|
*/
|
|
int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size)
|
|
{
|
|
Elf64_Phdr *phdr_notes, *phdr_loads;
|
|
int mem_chunk_cnt;
|
|
void *ptr, *hdr;
|
|
u32 alloc_size;
|
|
u64 hdr_off;
|
|
|
|
/* If we are not in kdump or zfcpdump mode return */
|
|
if (!OLDMEM_BASE && ipl_info.type != IPL_TYPE_FCP_DUMP)
|
|
return 0;
|
|
/* If elfcorehdr= has been passed via cmdline, we use that one */
|
|
if (elfcorehdr_addr != ELFCORE_ADDR_MAX)
|
|
return 0;
|
|
/* If we cannot get HSA size for zfcpdump return error */
|
|
if (ipl_info.type == IPL_TYPE_FCP_DUMP && !sclp_get_hsa_size())
|
|
return -ENODEV;
|
|
mem_chunk_cnt = get_mem_chunk_cnt();
|
|
|
|
alloc_size = 0x1000 + get_cpu_cnt() * 0x300 +
|
|
mem_chunk_cnt * sizeof(Elf64_Phdr);
|
|
hdr = kzalloc_panic(alloc_size);
|
|
/* Init elf header */
|
|
ptr = ehdr_init(hdr, mem_chunk_cnt);
|
|
/* Init program headers */
|
|
phdr_notes = ptr;
|
|
ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr));
|
|
phdr_loads = ptr;
|
|
ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr) * mem_chunk_cnt);
|
|
/* Init notes */
|
|
hdr_off = PTR_DIFF(ptr, hdr);
|
|
ptr = notes_init(phdr_notes, ptr, ((unsigned long) hdr) + hdr_off);
|
|
/* Init loads */
|
|
hdr_off = PTR_DIFF(ptr, hdr);
|
|
loads_init(phdr_loads, hdr_off);
|
|
*addr = (unsigned long long) hdr;
|
|
elfcorehdr_newmem = hdr;
|
|
*size = (unsigned long long) hdr_off;
|
|
BUG_ON(elfcorehdr_size > alloc_size);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Free ELF core header (new kernel)
|
|
*/
|
|
void elfcorehdr_free(unsigned long long addr)
|
|
{
|
|
if (!elfcorehdr_newmem)
|
|
return;
|
|
kfree((void *)(unsigned long)addr);
|
|
}
|
|
|
|
/*
|
|
* Read from ELF header
|
|
*/
|
|
ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos)
|
|
{
|
|
void *src = (void *)(unsigned long)*ppos;
|
|
|
|
src = elfcorehdr_newmem ? src : src - OLDMEM_BASE;
|
|
memcpy(buf, src, count);
|
|
*ppos += count;
|
|
return count;
|
|
}
|
|
|
|
/*
|
|
* Read from ELF notes data
|
|
*/
|
|
ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos)
|
|
{
|
|
void *src = (void *)(unsigned long)*ppos;
|
|
int rc;
|
|
|
|
if (elfcorehdr_newmem) {
|
|
memcpy(buf, src, count);
|
|
} else {
|
|
rc = copy_from_oldmem(buf, src, count);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
*ppos += count;
|
|
return count;
|
|
}
|