661 lines
16 KiB
C
661 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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/init.h>
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#include <linux/mm.h>
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#include <linux/gfp.h>
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#include <linux/slab.h>
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#include <linux/memblock.h>
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#include <linux/elf.h>
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#include <linux/uio.h>
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#include <asm/asm-offsets.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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static struct memblock_region oldmem_region;
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static struct memblock_type oldmem_type = {
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.cnt = 1,
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.max = 1,
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.total_size = 0,
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.regions = &oldmem_region,
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.name = "oldmem",
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};
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struct save_area {
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struct list_head list;
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u64 psw[2];
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u64 ctrs[16];
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u64 gprs[16];
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u32 acrs[16];
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u64 fprs[16];
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u32 fpc;
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u32 prefix;
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u64 todpreg;
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u64 timer;
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u64 todcmp;
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u64 vxrs_low[16];
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__vector128 vxrs_high[16];
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};
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static LIST_HEAD(dump_save_areas);
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static DEFINE_MUTEX(memcpy_real_mutex);
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static char memcpy_real_buf[PAGE_SIZE];
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/*
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* Allocate a save area
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*/
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struct save_area * __init save_area_alloc(bool is_boot_cpu)
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{
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struct save_area *sa;
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sa = memblock_alloc(sizeof(*sa), 8);
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if (!sa)
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return NULL;
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if (is_boot_cpu)
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list_add(&sa->list, &dump_save_areas);
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else
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list_add_tail(&sa->list, &dump_save_areas);
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return sa;
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}
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/*
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* Return the address of the save area for the boot CPU
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*/
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struct save_area * __init save_area_boot_cpu(void)
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{
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return list_first_entry_or_null(&dump_save_areas, struct save_area, list);
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}
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/*
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* Copy CPU registers into the save area
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*/
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void __init save_area_add_regs(struct save_area *sa, void *regs)
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{
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struct lowcore *lc;
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lc = (struct lowcore *)(regs - __LC_FPREGS_SAVE_AREA);
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memcpy(&sa->psw, &lc->psw_save_area, sizeof(sa->psw));
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memcpy(&sa->ctrs, &lc->cregs_save_area, sizeof(sa->ctrs));
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memcpy(&sa->gprs, &lc->gpregs_save_area, sizeof(sa->gprs));
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memcpy(&sa->acrs, &lc->access_regs_save_area, sizeof(sa->acrs));
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memcpy(&sa->fprs, &lc->floating_pt_save_area, sizeof(sa->fprs));
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memcpy(&sa->fpc, &lc->fpt_creg_save_area, sizeof(sa->fpc));
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memcpy(&sa->prefix, &lc->prefixreg_save_area, sizeof(sa->prefix));
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memcpy(&sa->todpreg, &lc->tod_progreg_save_area, sizeof(sa->todpreg));
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memcpy(&sa->timer, &lc->cpu_timer_save_area, sizeof(sa->timer));
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memcpy(&sa->todcmp, &lc->clock_comp_save_area, sizeof(sa->todcmp));
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}
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/*
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* Copy vector registers into the save area
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*/
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void __init save_area_add_vxrs(struct save_area *sa, __vector128 *vxrs)
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{
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int i;
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/* Copy lower halves of vector registers 0-15 */
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for (i = 0; i < 16; i++)
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memcpy(&sa->vxrs_low[i], &vxrs[i].u[2], 8);
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/* Copy vector registers 16-31 */
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memcpy(sa->vxrs_high, vxrs + 16, 16 * sizeof(__vector128));
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}
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static size_t copy_to_iter_real(struct iov_iter *iter, unsigned long src, size_t count)
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{
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size_t len, copied, res = 0;
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mutex_lock(&memcpy_real_mutex);
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while (count) {
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len = min(PAGE_SIZE, count);
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if (memcpy_real(memcpy_real_buf, src, len))
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break;
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copied = copy_to_iter(memcpy_real_buf, len, iter);
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count -= copied;
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src += copied;
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res += copied;
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if (copied < len)
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break;
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}
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mutex_unlock(&memcpy_real_mutex);
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return res;
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}
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size_t copy_oldmem_iter(struct iov_iter *iter, unsigned long src, size_t count)
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{
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size_t len, copied, res = 0;
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while (count) {
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if (!oldmem_data.start && src < sclp.hsa_size) {
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/* Copy from zfcp/nvme dump HSA area */
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len = min(count, sclp.hsa_size - src);
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copied = memcpy_hsa_iter(iter, src, len);
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} else {
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/* Check for swapped kdump oldmem areas */
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if (oldmem_data.start && src - oldmem_data.start < oldmem_data.size) {
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src -= oldmem_data.start;
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len = min(count, oldmem_data.size - src);
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} else if (oldmem_data.start && src < oldmem_data.size) {
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len = min(count, oldmem_data.size - src);
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src += oldmem_data.start;
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} else {
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len = count;
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}
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copied = copy_to_iter_real(iter, src, len);
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}
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count -= copied;
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src += copied;
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res += copied;
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if (copied < len)
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break;
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}
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return res;
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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(struct iov_iter *iter, unsigned long pfn, size_t csize,
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unsigned long offset)
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{
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unsigned long src;
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src = pfn_to_phys(pfn) + offset;
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return copy_oldmem_iter(iter, src, csize);
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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_data.size >> PAGE_SHIFT) {
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size_old = min(size, oldmem_data.size - (pfn << PAGE_SHIFT));
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rc = remap_pfn_range(vma, from,
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pfn + (oldmem_data.start >> 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 zfcp/nvme dump
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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.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 zfcp/nvme dump
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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_data.start)
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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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static const char *nt_name(Elf64_Word type)
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{
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const char *name = "LINUX";
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if (type == NT_PRPSINFO || type == NT_PRSTATUS || type == NT_PRFPREG)
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name = KEXEC_CORE_NOTE_NAME;
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return name;
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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_name(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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static inline void *nt_init(void *buf, Elf64_Word type, void *desc, int d_len)
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{
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return nt_init_name(buf, type, desc, d_len, nt_name(type));
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}
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/*
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* Calculate the size of ELF note
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*/
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static size_t nt_size_name(int d_len, const char *name)
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{
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size_t size;
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size = sizeof(Elf64_Nhdr);
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size += roundup(strlen(name) + 1, 4);
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size += roundup(d_len, 4);
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return size;
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}
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static inline size_t nt_size(Elf64_Word type, int d_len)
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{
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return nt_size_name(d_len, nt_name(type));
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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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static void *fill_cpu_elf_notes(void *ptr, int cpu, struct save_area *sa)
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{
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struct elf_prstatus nt_prstatus;
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elf_fpregset_t nt_fpregset;
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/* Prepare prstatus note */
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memset(&nt_prstatus, 0, sizeof(nt_prstatus));
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memcpy(&nt_prstatus.pr_reg.gprs, sa->gprs, sizeof(sa->gprs));
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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->acrs, sizeof(sa->acrs));
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nt_prstatus.common.pr_pid = cpu;
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/* Prepare fpregset (floating point) note */
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memset(&nt_fpregset, 0, sizeof(nt_fpregset));
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memcpy(&nt_fpregset.fpc, &sa->fpc, sizeof(sa->fpc));
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memcpy(&nt_fpregset.fprs, &sa->fprs, sizeof(sa->fprs));
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/* Create ELF notes for the CPU */
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ptr = nt_init(ptr, NT_PRSTATUS, &nt_prstatus, sizeof(nt_prstatus));
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ptr = nt_init(ptr, NT_PRFPREG, &nt_fpregset, sizeof(nt_fpregset));
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ptr = nt_init(ptr, NT_S390_TIMER, &sa->timer, sizeof(sa->timer));
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ptr = nt_init(ptr, NT_S390_TODCMP, &sa->todcmp, sizeof(sa->todcmp));
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ptr = nt_init(ptr, NT_S390_TODPREG, &sa->todpreg, sizeof(sa->todpreg));
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ptr = nt_init(ptr, NT_S390_CTRS, &sa->ctrs, sizeof(sa->ctrs));
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ptr = nt_init(ptr, NT_S390_PREFIX, &sa->prefix, sizeof(sa->prefix));
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if (MACHINE_HAS_VX) {
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ptr = nt_init(ptr, NT_S390_VXRS_HIGH,
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&sa->vxrs_high, sizeof(sa->vxrs_high));
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ptr = nt_init(ptr, NT_S390_VXRS_LOW,
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&sa->vxrs_low, sizeof(sa->vxrs_low));
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}
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return ptr;
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}
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/*
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* Calculate size of ELF notes per cpu
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*/
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static size_t get_cpu_elf_notes_size(void)
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{
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struct save_area *sa = NULL;
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size_t size;
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size = nt_size(NT_PRSTATUS, sizeof(struct elf_prstatus));
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size += nt_size(NT_PRFPREG, sizeof(elf_fpregset_t));
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size += nt_size(NT_S390_TIMER, sizeof(sa->timer));
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size += nt_size(NT_S390_TODCMP, sizeof(sa->todcmp));
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size += nt_size(NT_S390_TODPREG, sizeof(sa->todpreg));
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size += nt_size(NT_S390_CTRS, sizeof(sa->ctrs));
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size += nt_size(NT_S390_PREFIX, sizeof(sa->prefix));
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if (MACHINE_HAS_VX) {
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size += nt_size(NT_S390_VXRS_HIGH, sizeof(sa->vxrs_high));
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size += nt_size(NT_S390_VXRS_LOW, sizeof(sa->vxrs_low));
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}
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return size;
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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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}
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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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unsigned long addr;
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Elf64_Nhdr note;
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if (copy_oldmem_kernel(&addr, __LC_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_oldmem_kernel(¬e, addr, sizeof(note)))
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return NULL;
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if (copy_oldmem_kernel(nt_name, addr + sizeof(note),
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sizeof(nt_name) - 1))
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return NULL;
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if (strcmp(nt_name, VMCOREINFO_NOTE_NAME) != 0)
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return NULL;
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vmcoreinfo = kzalloc(note.n_descsz, GFP_KERNEL);
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if (!vmcoreinfo)
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return NULL;
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if (copy_oldmem_kernel(vmcoreinfo, addr + 24, note.n_descsz)) {
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kfree(vmcoreinfo);
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return NULL;
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}
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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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const char *name = VMCOREINFO_NOTE_NAME;
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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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return nt_init_name(ptr, 0, vmcoreinfo, size, name);
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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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ptr = nt_init_name(ptr, 0, vmcoreinfo, size, name);
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kfree(vmcoreinfo);
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return ptr;
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}
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static size_t nt_vmcoreinfo_size(void)
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{
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const char *name = VMCOREINFO_NOTE_NAME;
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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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return nt_size_name(size, name);
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vmcoreinfo = get_vmcoreinfo_old(&size);
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if (!vmcoreinfo)
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return 0;
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kfree(vmcoreinfo);
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return nt_size_name(size, name);
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}
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/*
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* Initialize final note (needed for /proc/vmcore code)
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*/
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static void *nt_final(void *ptr)
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{
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Elf64_Nhdr *note;
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note = (Elf64_Nhdr *) ptr;
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note->n_namesz = 0;
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note->n_descsz = 0;
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note->n_type = 0;
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return PTR_ADD(ptr, sizeof(Elf64_Nhdr));
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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)
|
|
{
|
|
struct save_area *sa;
|
|
int cpus = 0;
|
|
|
|
list_for_each_entry(sa, &dump_save_areas, list)
|
|
if (sa->prefix != 0)
|
|
cpus++;
|
|
return cpus;
|
|
}
|
|
|
|
/*
|
|
* Return memory chunk count for ELF header (new kernel)
|
|
*/
|
|
static int get_mem_chunk_cnt(void)
|
|
{
|
|
int cnt = 0;
|
|
u64 idx;
|
|
|
|
for_each_physmem_range(idx, &oldmem_type, NULL, NULL)
|
|
cnt++;
|
|
return cnt;
|
|
}
|
|
|
|
/*
|
|
* Initialize ELF loads (new kernel)
|
|
*/
|
|
static void loads_init(Elf64_Phdr *phdr, u64 loads_offset)
|
|
{
|
|
phys_addr_t start, end;
|
|
u64 idx;
|
|
|
|
for_each_physmem_range(idx, &oldmem_type, &start, &end) {
|
|
phdr->p_filesz = end - start;
|
|
phdr->p_type = PT_LOAD;
|
|
phdr->p_offset = start;
|
|
phdr->p_vaddr = start;
|
|
phdr->p_paddr = start;
|
|
phdr->p_memsz = end - start;
|
|
phdr->p_flags = PF_R | PF_W | PF_X;
|
|
phdr->p_align = PAGE_SIZE;
|
|
phdr++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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 cpu;
|
|
|
|
ptr = nt_prpsinfo(ptr);
|
|
|
|
cpu = 1;
|
|
list_for_each_entry(sa, &dump_save_areas, list)
|
|
if (sa->prefix != 0)
|
|
ptr = fill_cpu_elf_notes(ptr, cpu++, sa);
|
|
ptr = nt_vmcoreinfo(ptr);
|
|
ptr = nt_final(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;
|
|
}
|
|
|
|
static size_t get_elfcorehdr_size(int mem_chunk_cnt)
|
|
{
|
|
size_t size;
|
|
|
|
size = sizeof(Elf64_Ehdr);
|
|
/* PT_NOTES */
|
|
size += sizeof(Elf64_Phdr);
|
|
/* nt_prpsinfo */
|
|
size += nt_size(NT_PRPSINFO, sizeof(struct elf_prpsinfo));
|
|
/* regsets */
|
|
size += get_cpu_cnt() * get_cpu_elf_notes_size();
|
|
/* nt_vmcoreinfo */
|
|
size += nt_vmcoreinfo_size();
|
|
/* nt_final */
|
|
size += sizeof(Elf64_Nhdr);
|
|
/* PT_LOADS */
|
|
size += mem_chunk_cnt * sizeof(Elf64_Phdr);
|
|
|
|
return size;
|
|
}
|
|
|
|
/*
|
|
* 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 zfcp/nvme dump mode return */
|
|
if (!oldmem_data.start && !is_ipl_type_dump())
|
|
return 0;
|
|
/* If we cannot get HSA size for zfcp/nvme dump return error */
|
|
if (is_ipl_type_dump() && !sclp.hsa_size)
|
|
return -ENODEV;
|
|
|
|
/* For kdump, exclude previous crashkernel memory */
|
|
if (oldmem_data.start) {
|
|
oldmem_region.base = oldmem_data.start;
|
|
oldmem_region.size = oldmem_data.size;
|
|
oldmem_type.total_size = oldmem_data.size;
|
|
}
|
|
|
|
mem_chunk_cnt = get_mem_chunk_cnt();
|
|
|
|
alloc_size = get_elfcorehdr_size(mem_chunk_cnt);
|
|
|
|
hdr = kzalloc(alloc_size, GFP_KERNEL);
|
|
|
|
/* Without elfcorehdr /proc/vmcore cannot be created. Thus creating
|
|
* a dump with this crash kernel will fail. Panic now to allow other
|
|
* dump mechanisms to take over.
|
|
*/
|
|
if (!hdr)
|
|
panic("s390 kdump allocating elfcorehdr failed");
|
|
|
|
/* 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;
|
|
*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)
|
|
{
|
|
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;
|
|
|
|
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;
|
|
|
|
memcpy(buf, src, count);
|
|
*ppos += count;
|
|
return count;
|
|
}
|