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// SPDX-License-Identifier: GPL-1.0+
/*
* zcore module to export memory content and register sets for creating system
* dumps on SCSI disks (zfcpdump). The "zcore/mem" debugfs file shows the same
* dump format as s390 standalone dumps.
*
* For more information please refer to Documentation/s390/zfcpdump.txt
*
* Copyright IBM Corp. 2003, 2008
* Author(s): Michael Holzheu
*/
#define KMSG_COMPONENT "zdump"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
#include <linux/memblock.h>
#include <asm/asm-offsets.h>
#include <asm/ipl.h>
#include <asm/sclp.h>
#include <asm/setup.h>
#include <linux/uaccess.h>
#include <asm/debug.h>
#include <asm/processor.h>
#include <asm/irqflags.h>
#include <asm/checksum.h>
#include <asm/os_info.h>
#include <asm/switch_to.h>
#include "sclp.h"
#define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x)
#define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */
enum arch_id {
ARCH_S390 = 0,
ARCH_S390X = 1,
};
struct ipib_info {
unsigned long ipib;
u32 checksum;
} __attribute__((packed));
static struct debug_info *zcore_dbf;
static int hsa_available;
static struct dentry *zcore_dir;
static struct dentry *zcore_memmap_file;
static struct dentry *zcore_reipl_file;
static struct dentry *zcore_hsa_file;
static struct ipl_parameter_block *ipl_block;
static char hsa_buf[PAGE_SIZE] __aligned(PAGE_SIZE);
/*
* Copy memory from HSA to user memory (not reentrant):
*
* @dest: User buffer where memory should be copied to
* @src: Start address within HSA where data should be copied
* @count: Size of buffer, which should be copied
*/
int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
{
unsigned long offset, bytes;
if (!hsa_available)
return -ENODATA;
while (count) {
if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) {
TRACE("sclp_sdias_copy() failed\n");
return -EIO;
}
offset = src % PAGE_SIZE;
bytes = min(PAGE_SIZE - offset, count);
if (copy_to_user(dest, hsa_buf + offset, bytes))
return -EFAULT;
src += bytes;
dest += bytes;
count -= bytes;
}
return 0;
}
/*
* Copy memory from HSA to kernel memory (not reentrant):
*
* @dest: Kernel or user buffer where memory should be copied to
* @src: Start address within HSA where data should be copied
* @count: Size of buffer, which should be copied
*/
int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
{
unsigned long offset, bytes;
if (!hsa_available)
return -ENODATA;
while (count) {
if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) {
TRACE("sclp_sdias_copy() failed\n");
return -EIO;
}
offset = src % PAGE_SIZE;
bytes = min(PAGE_SIZE - offset, count);
memcpy(dest, hsa_buf + offset, bytes);
src += bytes;
dest += bytes;
count -= bytes;
}
return 0;
}
static int __init init_cpu_info(void)
{
struct save_area *sa;
/* get info for boot cpu from lowcore, stored in the HSA */
sa = save_area_boot_cpu();
if (!sa)
return -ENOMEM;
if (memcpy_hsa_kernel(hsa_buf, __LC_FPREGS_SAVE_AREA, 512) < 0) {
TRACE("could not copy from HSA\n");
return -EIO;
}
save_area_add_regs(sa, hsa_buf); /* vx registers are saved in smp.c */
return 0;
}
/*
* Release the HSA
*/
static void release_hsa(void)
{
diag308(DIAG308_REL_HSA, NULL);
hsa_available = 0;
}
static ssize_t zcore_memmap_read(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
return simple_read_from_buffer(buf, count, ppos, filp->private_data,
memblock.memory.cnt * CHUNK_INFO_SIZE);
}
static int zcore_memmap_open(struct inode *inode, struct file *filp)
{
struct memblock_region *reg;
char *buf;
int i = 0;
buf = kcalloc(memblock.memory.cnt, CHUNK_INFO_SIZE, GFP_KERNEL);
if (!buf) {
return -ENOMEM;
}
for_each_memblock(memory, reg) {
sprintf(buf + (i++ * CHUNK_INFO_SIZE), "%016llx %016llx ",
(unsigned long long) reg->base,
(unsigned long long) reg->size);
}
filp->private_data = buf;
return nonseekable_open(inode, filp);
}
static int zcore_memmap_release(struct inode *inode, struct file *filp)
{
kfree(filp->private_data);
return 0;
}
static const struct file_operations zcore_memmap_fops = {
.owner = THIS_MODULE,
.read = zcore_memmap_read,
.open = zcore_memmap_open,
.release = zcore_memmap_release,
.llseek = no_llseek,
};
static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf,
size_t count, loff_t *ppos)
{
if (ipl_block) {
diag308(DIAG308_SET, ipl_block);
diag308(DIAG308_LOAD_CLEAR, NULL);
}
return count;
}
static int zcore_reipl_open(struct inode *inode, struct file *filp)
{
return nonseekable_open(inode, filp);
}
static int zcore_reipl_release(struct inode *inode, struct file *filp)
{
return 0;
}
static const struct file_operations zcore_reipl_fops = {
.owner = THIS_MODULE,
.write = zcore_reipl_write,
.open = zcore_reipl_open,
.release = zcore_reipl_release,
.llseek = no_llseek,
};
static ssize_t zcore_hsa_read(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
static char str[18];
if (hsa_available)
snprintf(str, sizeof(str), "%lx\n", sclp.hsa_size);
else
snprintf(str, sizeof(str), "0\n");
return simple_read_from_buffer(buf, count, ppos, str, strlen(str));
}
static ssize_t zcore_hsa_write(struct file *filp, const char __user *buf,
size_t count, loff_t *ppos)
{
char value;
if (*ppos != 0)
return -EPIPE;
if (copy_from_user(&value, buf, 1))
return -EFAULT;
if (value != '0')
return -EINVAL;
release_hsa();
return count;
}
static const struct file_operations zcore_hsa_fops = {
.owner = THIS_MODULE,
.write = zcore_hsa_write,
.read = zcore_hsa_read,
.open = nonseekable_open,
.llseek = no_llseek,
};
static int __init check_sdias(void)
{
if (!sclp.hsa_size) {
TRACE("Could not determine HSA size\n");
return -ENODEV;
}
return 0;
}
/*
* Provide IPL parameter information block from either HSA or memory
* for future reipl
*/
static int __init zcore_reipl_init(void)
{
struct ipib_info ipib_info;
int rc;
rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info));
if (rc)
return rc;
if (ipib_info.ipib == 0)
return 0;
ipl_block = (void *) __get_free_page(GFP_KERNEL);
if (!ipl_block)
return -ENOMEM;
if (ipib_info.ipib < sclp.hsa_size)
rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE);
else
rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE);
if (rc || (__force u32)csum_partial(ipl_block, ipl_block->hdr.len
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