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711 lines
17 KiB
711 lines
17 KiB
// 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 <[email protected]> |
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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 <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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/* |
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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 = (void *) memblock_phys_alloc(sizeof(*sa), 8); |
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if (!sa) |
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panic("Failed to allocate save area\n"); |
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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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/* |
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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 memory of the old, dumped system to a kernel space virtual address |
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*/ |
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int copy_oldmem_kernel(void *dst, void *src, size_t count) |
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{ |
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unsigned long from, len; |
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void *ra; |
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int rc; |
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while (count) { |
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from = __pa(src); |
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if (!OLDMEM_BASE && from < sclp.hsa_size) { |
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/* Copy from zfcp/nvme dump HSA area */ |
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len = min(count, sclp.hsa_size - from); |
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rc = memcpy_hsa_kernel(dst, from, len); |
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if (rc) |
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return rc; |
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} else { |
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/* Check for swapped kdump oldmem areas */ |
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if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) { |
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from -= OLDMEM_BASE; |
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len = min(count, OLDMEM_SIZE - from); |
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} else if (OLDMEM_BASE && from < OLDMEM_SIZE) { |
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len = min(count, OLDMEM_SIZE - from); |
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from += OLDMEM_BASE; |
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} else { |
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len = count; |
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} |
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if (is_vmalloc_or_module_addr(dst)) { |
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ra = load_real_addr(dst); |
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len = min(PAGE_SIZE - offset_in_page(ra), len); |
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} else { |
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ra = dst; |
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} |
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if (memcpy_real(ra, (void *) from, len)) |
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return -EFAULT; |
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} |
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dst += len; |
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src += len; |
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count -= len; |
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} |
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return 0; |
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} |
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/* |
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* Copy memory of the old, dumped system to a user space virtual address |
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*/ |
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static int copy_oldmem_user(void __user *dst, void *src, size_t count) |
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{ |
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unsigned long from, len; |
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int rc; |
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while (count) { |
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from = __pa(src); |
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if (!OLDMEM_BASE && from < sclp.hsa_size) { |
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/* Copy from zfcp/nvme dump HSA area */ |
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len = min(count, sclp.hsa_size - from); |
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rc = memcpy_hsa_user(dst, from, len); |
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if (rc) |
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return rc; |
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} else { |
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/* Check for swapped kdump oldmem areas */ |
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if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) { |
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from -= OLDMEM_BASE; |
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len = min(count, OLDMEM_SIZE - from); |
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} else if (OLDMEM_BASE && from < OLDMEM_SIZE) { |
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len = min(count, OLDMEM_SIZE - from); |
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from += OLDMEM_BASE; |
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} else { |
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len = count; |
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} |
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rc = copy_to_user_real(dst, (void *) from, count); |
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if (rc) |
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return rc; |
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} |
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dst += len; |
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src += len; |
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count -= len; |
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} |
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return 0; |
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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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void *src; |
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int rc; |
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if (!csize) |
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return 0; |
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src = (void *) (pfn << PAGE_SHIFT) + offset; |
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if (userbuf) |
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rc = copy_oldmem_user((void __force __user *) buf, src, csize); |
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else |
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rc = copy_oldmem_kernel((void *) buf, src, csize); |
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return rc; |
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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 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_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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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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Elf64_Nhdr note; |
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void *addr; |
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if (copy_oldmem_kernel(&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_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) |
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{ |
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struct save_area *sa; |
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int cpus = 0; |
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list_for_each_entry(sa, &dump_save_areas, list) |
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if (sa->prefix != 0) |
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cpus++; |
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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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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_BASE && !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_BASE) { |
|
oldmem_region.base = OLDMEM_BASE; |
|
oldmem_region.size = OLDMEM_SIZE; |
|
oldmem_type.total_size = OLDMEM_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; |
|
}
|
|
|