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170 lines
4.0 KiB
170 lines
4.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* OS info memory interface |
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* |
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* Copyright IBM Corp. 2012 |
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* Author(s): Michael Holzheu <[email protected]> |
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*/ |
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#define KMSG_COMPONENT "os_info" |
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
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#include <linux/crash_dump.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <asm/checksum.h> |
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#include <asm/lowcore.h> |
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#include <asm/os_info.h> |
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/* |
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* OS info structure has to be page aligned |
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*/ |
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static struct os_info os_info __page_aligned_data; |
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/* |
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* Compute checksum over OS info structure |
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*/ |
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u32 os_info_csum(struct os_info *os_info) |
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{ |
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int size = sizeof(*os_info) - offsetof(struct os_info, version_major); |
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return (__force u32)csum_partial(&os_info->version_major, size, 0); |
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} |
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/* |
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* Add crashkernel info to OS info and update checksum |
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*/ |
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void os_info_crashkernel_add(unsigned long base, unsigned long size) |
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{ |
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os_info.crashkernel_addr = (u64)(unsigned long)base; |
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os_info.crashkernel_size = (u64)(unsigned long)size; |
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os_info.csum = os_info_csum(&os_info); |
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} |
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/* |
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* Add OS info entry and update checksum |
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*/ |
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void os_info_entry_add(int nr, void *ptr, u64 size) |
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{ |
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os_info.entry[nr].addr = (u64)(unsigned long)ptr; |
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os_info.entry[nr].size = size; |
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os_info.entry[nr].csum = (__force u32)csum_partial(ptr, size, 0); |
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os_info.csum = os_info_csum(&os_info); |
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} |
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/* |
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* Initialize OS info struture and set lowcore pointer |
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*/ |
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void __init os_info_init(void) |
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{ |
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void *ptr = &os_info; |
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os_info.version_major = OS_INFO_VERSION_MAJOR; |
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os_info.version_minor = OS_INFO_VERSION_MINOR; |
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os_info.magic = OS_INFO_MAGIC; |
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os_info.csum = os_info_csum(&os_info); |
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mem_assign_absolute(S390_lowcore.os_info, (unsigned long) ptr); |
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} |
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#ifdef CONFIG_CRASH_DUMP |
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static struct os_info *os_info_old; |
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/* |
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* Allocate and copy OS info entry from oldmem |
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*/ |
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static void os_info_old_alloc(int nr, int align) |
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{ |
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unsigned long addr, size = 0; |
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char *buf, *buf_align, *msg; |
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u32 csum; |
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addr = os_info_old->entry[nr].addr; |
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if (!addr) { |
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msg = "not available"; |
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goto fail; |
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} |
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size = os_info_old->entry[nr].size; |
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buf = kmalloc(size + align - 1, GFP_KERNEL); |
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if (!buf) { |
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msg = "alloc failed"; |
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goto fail; |
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} |
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buf_align = PTR_ALIGN(buf, align); |
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if (copy_oldmem_kernel(buf_align, (void *) addr, size)) { |
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msg = "copy failed"; |
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goto fail_free; |
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} |
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csum = (__force u32)csum_partial(buf_align, size, 0); |
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if (csum != os_info_old->entry[nr].csum) { |
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msg = "checksum failed"; |
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goto fail_free; |
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} |
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os_info_old->entry[nr].addr = (u64)(unsigned long)buf_align; |
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msg = "copied"; |
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goto out; |
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fail_free: |
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kfree(buf); |
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fail: |
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os_info_old->entry[nr].addr = 0; |
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out: |
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pr_info("entry %i: %s (addr=0x%lx size=%lu)\n", |
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nr, msg, addr, size); |
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} |
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/* |
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* Initialize os info and os info entries from oldmem |
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*/ |
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static void os_info_old_init(void) |
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{ |
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static int os_info_init; |
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unsigned long addr; |
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if (os_info_init) |
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return; |
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if (!OLDMEM_BASE) |
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goto fail; |
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if (copy_oldmem_kernel(&addr, &S390_lowcore.os_info, sizeof(addr))) |
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goto fail; |
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if (addr == 0 || addr % PAGE_SIZE) |
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goto fail; |
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os_info_old = kzalloc(sizeof(*os_info_old), GFP_KERNEL); |
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if (!os_info_old) |
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goto fail; |
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if (copy_oldmem_kernel(os_info_old, (void *) addr, |
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sizeof(*os_info_old))) |
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goto fail_free; |
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if (os_info_old->magic != OS_INFO_MAGIC) |
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goto fail_free; |
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if (os_info_old->csum != os_info_csum(os_info_old)) |
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goto fail_free; |
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if (os_info_old->version_major > OS_INFO_VERSION_MAJOR) |
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goto fail_free; |
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os_info_old_alloc(OS_INFO_VMCOREINFO, 1); |
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os_info_old_alloc(OS_INFO_REIPL_BLOCK, 1); |
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pr_info("crashkernel: addr=0x%lx size=%lu\n", |
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(unsigned long) os_info_old->crashkernel_addr, |
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(unsigned long) os_info_old->crashkernel_size); |
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os_info_init = 1; |
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return; |
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fail_free: |
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kfree(os_info_old); |
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fail: |
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os_info_init = 1; |
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os_info_old = NULL; |
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} |
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/* |
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* Return pointer to os infor entry and its size |
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*/ |
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void *os_info_old_entry(int nr, unsigned long *size) |
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{ |
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os_info_old_init(); |
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if (!os_info_old) |
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return NULL; |
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if (!os_info_old->entry[nr].addr) |
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return NULL; |
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*size = (unsigned long) os_info_old->entry[nr].size; |
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return (void *)(unsigned long)os_info_old->entry[nr].addr; |
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} |
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#endif
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