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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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652 lines
15 KiB
C
652 lines
15 KiB
C
![]() |
/*
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* zcore module to export memory content and register sets for creating system
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* dumps on SCSI disks (zfcpdump). The "zcore/mem" debugfs file shows the same
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* dump format as s390 standalone dumps.
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*
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* For more information please refer to Documentation/s390/zfcpdump.txt
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*
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* Copyright IBM Corp. 2003,2007
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* Author(s): Michael Holzheu
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*/
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#include <linux/init.h>
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#include <linux/miscdevice.h>
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#include <linux/utsname.h>
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#include <linux/debugfs.h>
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#include <asm/ipl.h>
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#include <asm/sclp.h>
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#include <asm/setup.h>
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#include <asm/sigp.h>
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#include <asm/uaccess.h>
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#include <asm/debug.h>
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#include <asm/processor.h>
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#include <asm/irqflags.h>
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#define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x)
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#define MSG(x...) printk( KERN_ALERT x )
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#define ERROR_MSG(x...) printk ( KERN_ALERT "DUMP: " x )
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#define TO_USER 0
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#define TO_KERNEL 1
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enum arch_id {
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ARCH_S390 = 0,
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ARCH_S390X = 1,
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};
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/* dump system info */
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struct sys_info {
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enum arch_id arch;
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unsigned long sa_base;
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u32 sa_size;
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int cpu_map[NR_CPUS];
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unsigned long mem_size;
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union save_area lc_mask;
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};
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static struct sys_info sys_info;
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static struct debug_info *zcore_dbf;
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static int hsa_available;
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static struct dentry *zcore_dir;
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static struct dentry *zcore_file;
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/*
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* Copy memory from HSA to kernel or user memory (not reentrant):
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*
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* @dest: Kernel or user buffer where memory should be copied to
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* @src: Start address within HSA where data should be copied
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* @count: Size of buffer, which should be copied
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* @mode: Either TO_KERNEL or TO_USER
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*/
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static int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode)
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{
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int offs, blk_num;
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static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
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if (count == 0)
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return 0;
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/* copy first block */
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offs = 0;
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if ((src % PAGE_SIZE) != 0) {
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blk_num = src / PAGE_SIZE + 2;
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if (sclp_sdias_copy(buf, blk_num, 1)) {
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TRACE("sclp_sdias_copy() failed\n");
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return -EIO;
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}
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offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count);
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if (mode == TO_USER) {
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if (copy_to_user((__force __user void*) dest,
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buf + (src % PAGE_SIZE), offs))
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return -EFAULT;
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} else
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memcpy(dest, buf + (src % PAGE_SIZE), offs);
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}
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if (offs == count)
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goto out;
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/* copy middle */
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for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) {
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blk_num = (src + offs) / PAGE_SIZE + 2;
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if (sclp_sdias_copy(buf, blk_num, 1)) {
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TRACE("sclp_sdias_copy() failed\n");
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return -EIO;
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}
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if (mode == TO_USER) {
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if (copy_to_user((__force __user void*) dest + offs,
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buf, PAGE_SIZE))
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return -EFAULT;
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} else
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memcpy(dest + offs, buf, PAGE_SIZE);
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}
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if (offs == count)
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goto out;
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/* copy last block */
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blk_num = (src + offs) / PAGE_SIZE + 2;
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if (sclp_sdias_copy(buf, blk_num, 1)) {
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TRACE("sclp_sdias_copy() failed\n");
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return -EIO;
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}
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if (mode == TO_USER) {
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if (copy_to_user((__force __user void*) dest + offs, buf,
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PAGE_SIZE))
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return -EFAULT;
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} else
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memcpy(dest + offs, buf, count - offs);
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out:
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return 0;
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}
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static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
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{
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return memcpy_hsa((void __force *) dest, src, count, TO_USER);
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}
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static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
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{
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return memcpy_hsa(dest, src, count, TO_KERNEL);
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}
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static int memcpy_real(void *dest, unsigned long src, size_t count)
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{
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unsigned long flags;
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int rc = -EFAULT;
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register unsigned long _dest asm("2") = (unsigned long) dest;
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register unsigned long _len1 asm("3") = (unsigned long) count;
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register unsigned long _src asm("4") = src;
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register unsigned long _len2 asm("5") = (unsigned long) count;
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if (count == 0)
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return 0;
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flags = __raw_local_irq_stnsm(0xf8); /* switch to real mode */
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asm volatile (
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"0: mvcle %1,%2,0x0\n"
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"1: jo 0b\n"
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" lhi %0,0x0\n"
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"2:\n"
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EX_TABLE(1b,2b)
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: "+d" (rc)
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: "d" (_dest), "d" (_src), "d" (_len1), "d" (_len2)
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: "cc", "memory");
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__raw_local_irq_ssm(flags);
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return rc;
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}
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static int memcpy_real_user(__user void *dest, unsigned long src, size_t count)
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{
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static char buf[4096];
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int offs = 0, size;
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while (offs < count) {
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size = min(sizeof(buf), count - offs);
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if (memcpy_real(buf, src + offs, size))
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return -EFAULT;
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if (copy_to_user(dest + offs, buf, size))
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return -EFAULT;
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offs += size;
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}
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return 0;
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}
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#ifdef __s390x__
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/*
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* Convert s390x (64 bit) cpu info to s390 (32 bit) cpu info
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*/
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static void __init s390x_to_s390_regs(union save_area *out, union save_area *in,
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int cpu)
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{
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int i;
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for (i = 0; i < 16; i++) {
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out->s390.gp_regs[i] = in->s390x.gp_regs[i] & 0x00000000ffffffff;
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out->s390.acc_regs[i] = in->s390x.acc_regs[i];
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out->s390.ctrl_regs[i] =
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in->s390x.ctrl_regs[i] & 0x00000000ffffffff;
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}
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/* locore for 31 bit has only space for fpregs 0,2,4,6 */
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out->s390.fp_regs[0] = in->s390x.fp_regs[0];
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out->s390.fp_regs[1] = in->s390x.fp_regs[2];
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out->s390.fp_regs[2] = in->s390x.fp_regs[4];
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out->s390.fp_regs[3] = in->s390x.fp_regs[6];
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memcpy(&(out->s390.psw[0]), &(in->s390x.psw[0]), 4);
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out->s390.psw[1] |= 0x8; /* set bit 12 */
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memcpy(&(out->s390.psw[4]),&(in->s390x.psw[12]), 4);
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out->s390.psw[4] |= 0x80; /* set (31bit) addressing bit */
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out->s390.pref_reg = in->s390x.pref_reg;
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out->s390.timer = in->s390x.timer;
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out->s390.clk_cmp = in->s390x.clk_cmp;
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}
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static void __init s390x_to_s390_save_areas(void)
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{
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int i = 1;
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static union save_area tmp;
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while (zfcpdump_save_areas[i]) {
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s390x_to_s390_regs(&tmp, zfcpdump_save_areas[i], i);
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memcpy(zfcpdump_save_areas[i], &tmp, sizeof(tmp));
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i++;
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}
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}
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#endif /* __s390x__ */
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static int __init init_cpu_info(enum arch_id arch)
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{
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union save_area *sa;
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/* get info for boot cpu from lowcore, stored in the HSA */
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sa = kmalloc(sizeof(*sa), GFP_KERNEL);
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if (!sa) {
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ERROR_MSG("kmalloc failed: %s: %i\n",__FUNCTION__, __LINE__);
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return -ENOMEM;
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}
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if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) {
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ERROR_MSG("could not copy from HSA\n");
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kfree(sa);
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return -EIO;
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}
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zfcpdump_save_areas[0] = sa;
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#ifdef __s390x__
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/* convert s390x regs to s390, if we are dumping an s390 Linux */
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if (arch == ARCH_S390)
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s390x_to_s390_save_areas();
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#endif
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return 0;
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}
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static DEFINE_MUTEX(zcore_mutex);
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#define DUMP_VERSION 0x3
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#define DUMP_MAGIC 0xa8190173618f23fdULL
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#define DUMP_ARCH_S390X 2
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#define DUMP_ARCH_S390 1
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#define HEADER_SIZE 4096
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/* dump header dumped according to s390 crash dump format */
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struct zcore_header {
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u64 magic;
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u32 version;
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u32 header_size;
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u32 dump_level;
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u32 page_size;
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u64 mem_size;
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u64 mem_start;
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u64 mem_end;
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u32 num_pages;
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u32 pad1;
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u64 tod;
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cpuid_t cpu_id;
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u32 arch_id;
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u32 build_arch;
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char pad2[4016];
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} __attribute__((packed,__aligned__(16)));
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static struct zcore_header zcore_header = {
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.magic = DUMP_MAGIC,
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.version = DUMP_VERSION,
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.header_size = 4096,
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.dump_level = 0,
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.page_size = PAGE_SIZE,
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.mem_start = 0,
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#ifdef __s390x__
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.build_arch = DUMP_ARCH_S390X,
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#else
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.build_arch = DUMP_ARCH_S390,
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#endif
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};
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/*
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* Copy lowcore info to buffer. Use map in order to copy only register parts.
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*
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* @buf: User buffer
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* @sa: Pointer to save area
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* @sa_off: Offset in save area to copy
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* @len: Number of bytes to copy
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*/
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static int copy_lc(void __user *buf, void *sa, int sa_off, int len)
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{
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int i;
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char *lc_mask = (char*)&sys_info.lc_mask;
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for (i = 0; i < len; i++) {
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if (!lc_mask[i + sa_off])
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continue;
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if (copy_to_user(buf + i, sa + sa_off + i, 1))
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return -EFAULT;
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}
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return 0;
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}
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/*
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* Copy lowcores info to memory, if necessary
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*
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* @buf: User buffer
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* @addr: Start address of buffer in dump memory
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* @count: Size of buffer
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*/
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static int zcore_add_lc(char __user *buf, unsigned long start, size_t count)
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{
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unsigned long end;
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int i = 0;
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if (count == 0)
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return 0;
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end = start + count;
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while (zfcpdump_save_areas[i]) {
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unsigned long cp_start, cp_end; /* copy range */
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unsigned long sa_start, sa_end; /* save area range */
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unsigned long prefix;
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unsigned long sa_off, len, buf_off;
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if (sys_info.arch == ARCH_S390)
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prefix = zfcpdump_save_areas[i]->s390.pref_reg;
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else
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prefix = zfcpdump_save_areas[i]->s390x.pref_reg;
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sa_start = prefix + sys_info.sa_base;
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sa_end = prefix + sys_info.sa_base + sys_info.sa_size;
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if ((end < sa_start) || (start > sa_end))
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goto next;
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cp_start = max(start, sa_start);
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cp_end = min(end, sa_end);
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buf_off = cp_start - start;
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sa_off = cp_start - sa_start;
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len = cp_end - cp_start;
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TRACE("copy_lc for: %lx\n", start);
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if (copy_lc(buf + buf_off, zfcpdump_save_areas[i], sa_off, len))
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return -EFAULT;
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next:
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i++;
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}
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return 0;
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}
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/*
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* Read routine for zcore character device
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* First 4K are dump header
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* Next 32MB are HSA Memory
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* Rest is read from absolute Memory
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*/
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static ssize_t zcore_read(struct file *file, char __user *buf, size_t count,
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loff_t *ppos)
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{
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unsigned long mem_start; /* Start address in memory */
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size_t mem_offs; /* Offset in dump memory */
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size_t hdr_count; /* Size of header part of output buffer */
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size_t size;
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int rc;
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mutex_lock(&zcore_mutex);
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if (*ppos > (sys_info.mem_size + HEADER_SIZE)) {
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rc = -EINVAL;
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goto fail;
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}
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count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos));
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/* Copy dump header */
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if (*ppos < HEADER_SIZE) {
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size = min(count, (size_t) (HEADER_SIZE - *ppos));
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if (copy_to_user(buf, &zcore_header + *ppos, size)) {
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rc = -EFAULT;
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goto fail;
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}
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hdr_count = size;
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mem_start = 0;
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} else {
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hdr_count = 0;
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mem_start = *ppos - HEADER_SIZE;
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}
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mem_offs = 0;
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/* Copy from HSA data */
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if (*ppos < (ZFCPDUMP_HSA_SIZE + HEADER_SIZE)) {
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size = min((count - hdr_count), (size_t) (ZFCPDUMP_HSA_SIZE
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- mem_start));
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rc = memcpy_hsa_user(buf + hdr_count, mem_start, size);
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if (rc)
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goto fail;
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mem_offs += size;
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}
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/* Copy from real mem */
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size = count - mem_offs - hdr_count;
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rc = memcpy_real_user(buf + hdr_count + mem_offs, mem_start + mem_offs,
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size);
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if (rc)
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goto fail;
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/*
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* Since s390 dump analysis tools like lcrash or crash
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* expect register sets in the prefix pages of the cpus,
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* we copy them into the read buffer, if necessary.
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* buf + hdr_count: Start of memory part of output buffer
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* mem_start: Start memory address to copy from
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* count - hdr_count: Size of memory area to copy
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*/
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if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) {
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rc = -EFAULT;
|
||
|
goto fail;
|
||
|
}
|
||
|
*ppos += count;
|
||
|
fail:
|
||
|
mutex_unlock(&zcore_mutex);
|
||
|
return (rc < 0) ? rc : count;
|
||
|
}
|
||
|
|
||
|
static int zcore_open(struct inode *inode, struct file *filp)
|
||
|
{
|
||
|
if (!hsa_available)
|
||
|
return -ENODATA;
|
||
|
else
|
||
|
return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
|
||
|
}
|
||
|
|
||
|
static int zcore_release(struct inode *inode, struct file *filep)
|
||
|
{
|
||
|
diag308(DIAG308_REL_HSA, NULL);
|
||
|
hsa_available = 0;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static loff_t zcore_lseek(struct file *file, loff_t offset, int orig)
|
||
|
{
|
||
|
loff_t rc;
|
||
|
|
||
|
mutex_lock(&zcore_mutex);
|
||
|
switch (orig) {
|
||
|
case 0:
|
||
|
file->f_pos = offset;
|
||
|
rc = file->f_pos;
|
||
|
break;
|
||
|
case 1:
|
||
|
file->f_pos += offset;
|
||
|
rc = file->f_pos;
|
||
|
break;
|
||
|
default:
|
||
|
rc = -EINVAL;
|
||
|
}
|
||
|
mutex_unlock(&zcore_mutex);
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
static struct file_operations zcore_fops = {
|
||
|
.owner = THIS_MODULE,
|
||
|
.llseek = zcore_lseek,
|
||
|
.read = zcore_read,
|
||
|
.open = zcore_open,
|
||
|
.release = zcore_release,
|
||
|
};
|
||
|
|
||
|
|
||
|
static void __init set_s390_lc_mask(union save_area *map)
|
||
|
{
|
||
|
memset(&map->s390.ext_save, 0xff, sizeof(map->s390.ext_save));
|
||
|
memset(&map->s390.timer, 0xff, sizeof(map->s390.timer));
|
||
|
memset(&map->s390.clk_cmp, 0xff, sizeof(map->s390.clk_cmp));
|
||
|
memset(&map->s390.psw, 0xff, sizeof(map->s390.psw));
|
||
|
memset(&map->s390.pref_reg, 0xff, sizeof(map->s390.pref_reg));
|
||
|
memset(&map->s390.acc_regs, 0xff, sizeof(map->s390.acc_regs));
|
||
|
memset(&map->s390.fp_regs, 0xff, sizeof(map->s390.fp_regs));
|
||
|
memset(&map->s390.gp_regs, 0xff, sizeof(map->s390.gp_regs));
|
||
|
memset(&map->s390.ctrl_regs, 0xff, sizeof(map->s390.ctrl_regs));
|
||
|
}
|
||
|
|
||
|
static void __init set_s390x_lc_mask(union save_area *map)
|
||
|
{
|
||
|
memset(&map->s390x.fp_regs, 0xff, sizeof(map->s390x.fp_regs));
|
||
|
memset(&map->s390x.gp_regs, 0xff, sizeof(map->s390x.gp_regs));
|
||
|
memset(&map->s390x.psw, 0xff, sizeof(map->s390x.psw));
|
||
|
memset(&map->s390x.pref_reg, 0xff, sizeof(map->s390x.pref_reg));
|
||
|
memset(&map->s390x.fp_ctrl_reg, 0xff, sizeof(map->s390x.fp_ctrl_reg));
|
||
|
memset(&map->s390x.tod_reg, 0xff, sizeof(map->s390x.tod_reg));
|
||
|
memset(&map->s390x.timer, 0xff, sizeof(map->s390x.timer));
|
||
|
memset(&map->s390x.clk_cmp, 0xff, sizeof(map->s390x.clk_cmp));
|
||
|
memset(&map->s390x.acc_regs, 0xff, sizeof(map->s390x.acc_regs));
|
||
|
memset(&map->s390x.ctrl_regs, 0xff, sizeof(map->s390x.ctrl_regs));
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Initialize dump globals for a given architecture
|
||
|
*/
|
||
|
static int __init sys_info_init(enum arch_id arch)
|
||
|
{
|
||
|
switch (arch) {
|
||
|
case ARCH_S390X:
|
||
|
MSG("DETECTED 'S390X (64 bit) OS'\n");
|
||
|
sys_info.sa_base = SAVE_AREA_BASE_S390X;
|
||
|
sys_info.sa_size = sizeof(struct save_area_s390x);
|
||
|
set_s390x_lc_mask(&sys_info.lc_mask);
|
||
|
break;
|
||
|
case ARCH_S390:
|
||
|
MSG("DETECTED 'S390 (32 bit) OS'\n");
|
||
|
sys_info.sa_base = SAVE_AREA_BASE_S390;
|
||
|
sys_info.sa_size = sizeof(struct save_area_s390);
|
||
|
set_s390_lc_mask(&sys_info.lc_mask);
|
||
|
break;
|
||
|
default:
|
||
|
ERROR_MSG("unknown architecture 0x%x.\n",arch);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
sys_info.arch = arch;
|
||
|
if (init_cpu_info(arch)) {
|
||
|
ERROR_MSG("get cpu info failed\n");
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
sys_info.mem_size = real_memory_size;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int __init check_sdias(void)
|
||
|
{
|
||
|
int rc, act_hsa_size;
|
||
|
|
||
|
rc = sclp_sdias_blk_count();
|
||
|
if (rc < 0) {
|
||
|
ERROR_MSG("Could not determine HSA size\n");
|
||
|
return rc;
|
||
|
}
|
||
|
act_hsa_size = (rc - 1) * PAGE_SIZE;
|
||
|
if (act_hsa_size < ZFCPDUMP_HSA_SIZE) {
|
||
|
ERROR_MSG("HSA size too small: %i\n", act_hsa_size);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void __init zcore_header_init(int arch, struct zcore_header *hdr)
|
||
|
{
|
||
|
if (arch == ARCH_S390X)
|
||
|
hdr->arch_id = DUMP_ARCH_S390X;
|
||
|
else
|
||
|
hdr->arch_id = DUMP_ARCH_S390;
|
||
|
hdr->mem_size = sys_info.mem_size;
|
||
|
hdr->mem_end = sys_info.mem_size;
|
||
|
hdr->num_pages = sys_info.mem_size / PAGE_SIZE;
|
||
|
hdr->tod = get_clock();
|
||
|
get_cpu_id(&hdr->cpu_id);
|
||
|
}
|
||
|
|
||
|
extern int sdias_init(void);
|
||
|
|
||
|
static int __init zcore_init(void)
|
||
|
{
|
||
|
unsigned char arch;
|
||
|
int rc;
|
||
|
|
||
|
if (ipl_info.type != IPL_TYPE_FCP_DUMP)
|
||
|
return -ENODATA;
|
||
|
|
||
|
zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long));
|
||
|
debug_register_view(zcore_dbf, &debug_sprintf_view);
|
||
|
debug_set_level(zcore_dbf, 6);
|
||
|
|
||
|
TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno);
|
||
|
TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn);
|
||
|
TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun);
|
||
|
|
||
|
rc = sdias_init();
|
||
|
if (rc)
|
||
|
goto fail;
|
||
|
|
||
|
rc = check_sdias();
|
||
|
if (rc) {
|
||
|
ERROR_MSG("Dump initialization failed\n");
|
||
|
goto fail;
|
||
|
}
|
||
|
|
||
|
rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1);
|
||
|
if (rc) {
|
||
|
ERROR_MSG("sdial memcpy for arch id failed\n");
|
||
|
goto fail;
|
||
|
}
|
||
|
|
||
|
#ifndef __s390x__
|
||
|
if (arch == ARCH_S390X) {
|
||
|
ERROR_MSG("32 bit dumper can't dump 64 bit system!\n");
|
||
|
rc = -EINVAL;
|
||
|
goto fail;
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
rc = sys_info_init(arch);
|
||
|
if (rc) {
|
||
|
ERROR_MSG("arch init failed\n");
|
||
|
goto fail;
|
||
|
}
|
||
|
|
||
|
zcore_header_init(arch, &zcore_header);
|
||
|
|
||
|
zcore_dir = debugfs_create_dir("zcore" , NULL);
|
||
|
if (!zcore_dir) {
|
||
|
rc = -ENOMEM;
|
||
|
goto fail;
|
||
|
}
|
||
|
zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL,
|
||
|
&zcore_fops);
|
||
|
if (!zcore_file) {
|
||
|
debugfs_remove(zcore_dir);
|
||
|
rc = -ENOMEM;
|
||
|
goto fail;
|
||
|
}
|
||
|
hsa_available = 1;
|
||
|
return 0;
|
||
|
|
||
|
fail:
|
||
|
diag308(DIAG308_REL_HSA, NULL);
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
extern void sdias_exit(void);
|
||
|
|
||
|
static void __exit zcore_exit(void)
|
||
|
{
|
||
|
debug_unregister(zcore_dbf);
|
||
|
sdias_exit();
|
||
|
diag308(DIAG308_REL_HSA, NULL);
|
||
|
}
|
||
|
|
||
|
MODULE_AUTHOR("Copyright IBM Corp. 2003,2007");
|
||
|
MODULE_DESCRIPTION("zcore module for zfcpdump support");
|
||
|
MODULE_LICENSE("GPL");
|
||
|
|
||
|
subsys_initcall(zcore_init);
|
||
|
module_exit(zcore_exit);
|