[linux-block.git] / arch / s390 / kernel / crash_dump.c

/*
 * S390 kdump implementation
 *
 * Copyright IBM Corp. 2011
 * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
 */

#include <linux/crash_dump.h>
#include <asm/lowcore.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/slab.h>
#include <linux/bootmem.h>
#include <linux/elf.h>
#include <asm/asm-offsets.h>
#include <linux/memblock.h>
#include <asm/os_info.h>
#include <asm/elf.h>
#include <asm/ipl.h>
#include <asm/sclp.h>

#define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y)))
#define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y)))
#define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y))))

static struct memblock_region oldmem_region;

static struct memblock_type oldmem_type = {
	.cnt = 1,
	.max = 1,
	.total_size = 0,
	.regions = &oldmem_region,
};

struct save_area {
	struct list_head list;
	u64 psw[2];
	u64 ctrs[16];
	u64 gprs[16];
	u32 acrs[16];
	u64 fprs[16];
	u32 fpc;
	u32 prefix;
	u64 todpreg;
	u64 timer;
	u64 todcmp;
	u64 vxrs_low[16];
	__vector128 vxrs_high[16];
};

static LIST_HEAD(dump_save_areas);

/*
 * Allocate a save area
 */
struct save_area * __init save_area_alloc(bool is_boot_cpu)
{
	struct save_area *sa;

	sa = (void *) memblock_alloc(sizeof(*sa), 8);
	if (is_boot_cpu)
		list_add(&sa->list, &dump_save_areas);
	else
		list_add_tail(&sa->list, &dump_save_areas);
	return sa;
}

/*
 * Return the address of the save area for the boot CPU
 */
struct save_area * __init save_area_boot_cpu(void)
{
	if (list_empty(&dump_save_areas))
		return NULL;
	return list_first_entry(&dump_save_areas, struct save_area, list);
}

/*
 * Copy CPU registers into the save area
 */
void __init save_area_add_regs(struct save_area *sa, void *regs)
{
	struct lowcore *lc;

	lc = (struct lowcore *)(regs - __LC_FPREGS_SAVE_AREA);
	memcpy(&sa->psw, &lc->psw_save_area, sizeof(sa->psw));
	memcpy(&sa->ctrs, &lc->cregs_save_area, sizeof(sa->ctrs));
	memcpy(&sa->gprs, &lc->gpregs_save_area, sizeof(sa->gprs));
	memcpy(&sa->acrs, &lc->access_regs_save_area, sizeof(sa->acrs));
	memcpy(&sa->fprs, &lc->floating_pt_save_area, sizeof(sa->fprs));
	memcpy(&sa->fpc, &lc->fpt_creg_save_area, sizeof(sa->fpc));
	memcpy(&sa->prefix, &lc->prefixreg_save_area, sizeof(sa->prefix));
	memcpy(&sa->todpreg, &lc->tod_progreg_save_area, sizeof(sa->todpreg));
	memcpy(&sa->timer, &lc->cpu_timer_save_area, sizeof(sa->timer));
	memcpy(&sa->todcmp, &lc->clock_comp_save_area, sizeof(sa->todcmp));
}

/*
 * Copy vector registers into the save area
 */
void __init save_area_add_vxrs(struct save_area *sa, __vector128 *vxrs)
{
	int i;

	/* Copy lower halves of vector registers 0-15 */
	for (i = 0; i < 16; i++)
		memcpy(&sa->vxrs_low[i], &vxrs[i].u[2], 8);
	/* Copy vector registers 16-31 */
	memcpy(sa->vxrs_high, vxrs + 16, 16 * sizeof(__vector128));
}

/*
 * Return physical address for virtual address
 */
static inline void *load_real_addr(void *addr)
{
	unsigned long real_addr;

	asm volatile(
		   "	lra     %0,0(%1)\n"
		   "	jz	0f\n"
		   "	la	%0,0\n"
		   "0:"
		   : "=a" (real_addr) : "a" (addr) : "cc");
	return (void *)real_addr;
}

/*
 * Copy memory of the old, dumped system to a kernel space virtual address
 */
int copy_oldmem_kernel(void *dst, void *src, size_t count)
{
	unsigned long from, len;
	void *ra;
	int rc;

	while (count) {
		from = __pa(src);
		if (!OLDMEM_BASE && from < sclp.hsa_size) {
			/* Copy from zfcpdump HSA area */
			len = min(count, sclp.hsa_size - from);
			rc = memcpy_hsa_kernel(dst, from, len);
			if (rc)
				return rc;
		} else {
			/* Check for swapped kdump oldmem areas */
			if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) {
				from -= OLDMEM_BASE;
				len = min(count, OLDMEM_SIZE - from);
			} else if (OLDMEM_BASE && from < OLDMEM_SIZE) {
				len = min(count, OLDMEM_SIZE - from);
				from += OLDMEM_BASE;
			} else {
				len = count;
			}
			if (is_vmalloc_or_module_addr(dst)) {
				ra = load_real_addr(dst);
				len = min(PAGE_SIZE - offset_in_page(ra), len);
			} else {
				ra = dst;
			}
			if (memcpy_real(ra, (void *) from, len))
				return -EFAULT;
		}
		dst += len;
		src += len;
		count -= len;
	}
	return 0;
}

/*
 * Copy memory of the old, dumped system to a user space virtual address
 */
int copy_oldmem_user(void __user *dst, void *src, size_t count)
{
	unsigned long from, len;
	int rc;

	while (count) {
		from = __pa(src);
		if (!OLDMEM_BASE && from < sclp.hsa_size) {
			/* Copy from zfcpdump HSA area */
			len = min(count, sclp.hsa_size - from);
			rc = memcpy_hsa_user(dst, from, len);
			if (rc)
				return rc;
		} else {
			/* Check for swapped kdump oldmem areas */
			if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) {
				from -= OLDMEM_BASE;
				len = min(count, OLDMEM_SIZE - from);
			} else if (OLDMEM_BASE && from < OLDMEM_SIZE) {
				len = min(count, OLDMEM_SIZE - from);
				from += OLDMEM_BASE;
			} else {
				len = count;
			}
			rc = copy_to_user_real(dst, (void *) from, count);
			if (rc)
				return rc;
		}
		dst += len;
		src += len;
		count -= len;
	}
	return 0;
}

/*
 * Copy one page from "oldmem"
 */
ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
			 unsigned long offset, int userbuf)
{
	void *src;
	int rc;

	if (!csize)
		return 0;
	src = (void *) (pfn << PAGE_SHIFT) + offset;
	if (userbuf)
		rc = copy_oldmem_user((void __force __user *) buf, src, csize);
	else
		rc = copy_oldmem_kernel((void *) buf, src, csize);
	return rc;
}

/*
 * Remap "oldmem" for kdump
 *
 * For the kdump reserved memory this functions performs a swap operation:
 * [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE]
 */
static int remap_oldmem_pfn_range_kdump(struct vm_area_struct *vma,
					unsigned long from, unsigned long pfn,
					unsigned long size, pgprot_t prot)
{
	unsigned long size_old;
	int rc;

	if (pfn < OLDMEM_SIZE >> PAGE_SHIFT) {
		size_old = min(size, OLDMEM_SIZE - (pfn << PAGE_SHIFT));
		rc = remap_pfn_range(vma, from,
				     pfn + (OLDMEM_BASE >> PAGE_SHIFT),
				     size_old, prot);
		if (rc || size == size_old)
			return rc;
		size -= size_old;
		from += size_old;
		pfn += size_old >> PAGE_SHIFT;
	}
	return remap_pfn_range(vma, from, pfn, size, prot);
}

/*
 * Remap "oldmem" for zfcpdump
 *
 * We only map available memory above HSA size. Memory below HSA size
 * is read on demand using the copy_oldmem_page() function.
 */
static int remap_oldmem_pfn_range_zfcpdump(struct vm_area_struct *vma,
					   unsigned long from,
					   unsigned long pfn,
					   unsigned long size, pgprot_t prot)
{
	unsigned long hsa_end = sclp.hsa_size;
	unsigned long size_hsa;

	if (pfn < hsa_end >> PAGE_SHIFT) {
		size_hsa = min(size, hsa_end - (pfn << PAGE_SHIFT));
		if (size == size_hsa)
			return 0;
		size -= size_hsa;
		from += size_hsa;
		pfn += size_hsa >> PAGE_SHIFT;
	}
	return remap_pfn_range(vma, from, pfn, size, prot);
}

/*
 * Remap "oldmem" for kdump or zfcpdump
 */
int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from,
			   unsigned long pfn, unsigned long size, pgprot_t prot)
{
	if (OLDMEM_BASE)
		return remap_oldmem_pfn_range_kdump(vma, from, pfn, size, prot);
	else
		return remap_oldmem_pfn_range_zfcpdump(vma, from, pfn, size,
						       prot);
}

/*
 * Alloc memory and panic in case of ENOMEM
 */
static void *kzalloc_panic(int len)
{
	void *rc;

	rc = kzalloc(len, GFP_KERNEL);
	if (!rc)
		panic("s390 kdump kzalloc (%d) failed", len);
	return rc;
}

/*
 * Initialize ELF note
 */
static void *nt_init_name(void *buf, Elf64_Word type, void *desc, int d_len,
			  const char *name)
{
	Elf64_Nhdr *note;
	u64 len;

	note = (Elf64_Nhdr *)buf;
	note->n_namesz = strlen(name) + 1;
	note->n_descsz = d_len;
	note->n_type = type;
	len = sizeof(Elf64_Nhdr);

	memcpy(buf + len, name, note->n_namesz);
	len = roundup(len + note->n_namesz, 4);

	memcpy(buf + len, desc, note->n_descsz);
	len = roundup(len + note->n_descsz, 4);

	return PTR_ADD(buf, len);
}

static inline void *nt_init(void *buf, Elf64_Word type, void *desc, int d_len)
{
	return nt_init_name(buf, type, desc, d_len, KEXEC_CORE_NOTE_NAME);
}

/*
 * Fill ELF notes for one CPU with save area registers
 */
static void *fill_cpu_elf_notes(void *ptr, int cpu, struct save_area *sa)
{
	struct elf_prstatus nt_prstatus;
	elf_fpregset_t nt_fpregset;

	/* Prepare prstatus note */
	memset(&nt_prstatus, 0, sizeof(nt_prstatus));
	memcpy(&nt_prstatus.pr_reg.gprs, sa->gprs, sizeof(sa->gprs));
	memcpy(&nt_prstatus.pr_reg.psw, sa->psw, sizeof(sa->psw));
	memcpy(&nt_prstatus.pr_reg.acrs, sa->acrs, sizeof(sa->acrs));
	nt_prstatus.pr_pid = cpu;
	/* Prepare fpregset (floating point) note */
	memset(&nt_fpregset, 0, sizeof(nt_fpregset));
	memcpy(&nt_fpregset.fpc, &sa->fpc, sizeof(sa->fpc));
	memcpy(&nt_fpregset.fprs, &sa->fprs, sizeof(sa->fprs));
	/* Create ELF notes for the CPU */
	ptr = nt_init(ptr, NT_PRSTATUS, &nt_prstatus, sizeof(nt_prstatus));
	ptr = nt_init(ptr, NT_PRFPREG, &nt_fpregset, sizeof(nt_fpregset));
	ptr = nt_init(ptr, NT_S390_TIMER, &sa->timer, sizeof(sa->timer));
	ptr = nt_init(ptr, NT_S390_TODCMP, &sa->todcmp, sizeof(sa->todcmp));
	ptr = nt_init(ptr, NT_S390_TODPREG, &sa->todpreg, sizeof(sa->todpreg));
	ptr = nt_init(ptr, NT_S390_CTRS, &sa->ctrs, sizeof(sa->ctrs));
	ptr = nt_init(ptr, NT_S390_PREFIX, &sa->prefix, sizeof(sa->prefix));
	if (MACHINE_HAS_VX) {
		ptr = nt_init(ptr, NT_S390_VXRS_HIGH,
			      &sa->vxrs_high, sizeof(sa->vxrs_high));
		ptr = nt_init(ptr, NT_S390_VXRS_LOW,
			      &sa->vxrs_low, sizeof(sa->vxrs_low));
	}
	return ptr;
}

/*
 * Initialize prpsinfo note (new kernel)
 */
static void *nt_prpsinfo(void *ptr)
{
	struct elf_prpsinfo prpsinfo;

	memset(&prpsinfo, 0, sizeof(prpsinfo));
	prpsinfo.pr_sname = 'R';
	strcpy(prpsinfo.pr_fname, "vmlinux");
	return nt_init(ptr, NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo));
}

/*
 * Get vmcoreinfo using lowcore->vmcore_info (new kernel)
 */
static void *get_vmcoreinfo_old(unsigned long *size)
{
	char nt_name[11], *vmcoreinfo;
	Elf64_Nhdr note;
	void *addr;

	if (copy_oldmem_kernel(&addr, &S390_lowcore.vmcore_info, sizeof(addr)))
		return NULL;
	memset(nt_name, 0, sizeof(nt_name));
	if (copy_oldmem_kernel(&note, addr, sizeof(note)))
		return NULL;
	if (copy_oldmem_kernel(nt_name, addr + sizeof(note),
			       sizeof(nt_name) - 1))
		return NULL;
	if (strcmp(nt_name, "VMCOREINFO") != 0)
		return NULL;
	vmcoreinfo = kzalloc_panic(note.n_descsz);
	if (copy_oldmem_kernel(vmcoreinfo, addr + 24, note.n_descsz))
		return NULL;
	*size = note.n_descsz;
	return vmcoreinfo;
}

/*
 * Initialize vmcoreinfo note (new kernel)
 */
static void *nt_vmcoreinfo(void *ptr)
{
	unsigned long size;
	void *vmcoreinfo;

	vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size);
	if (!vmcoreinfo)
		vmcoreinfo = get_vmcoreinfo_old(&size);
	if (!vmcoreinfo)
		return ptr;
	return nt_init_name(ptr, 0, vmcoreinfo, size, "VMCOREINFO");
}

/*
 * Initialize ELF header (new kernel)
 */
static void *ehdr_init(Elf64_Ehdr *ehdr, int mem_chunk_cnt)
{
	memset(ehdr, 0, sizeof(*ehdr));
	memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
	ehdr->e_ident[EI_CLASS] = ELFCLASS64;
	ehdr->e_ident[EI_DATA] = ELFDATA2MSB;
	ehdr->e_ident[EI_VERSION] = EV_CURRENT;
	memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD);
	ehdr->e_type = ET_CORE;
	ehdr->e_machine = EM_S390;
	ehdr->e_version = EV_CURRENT;
	ehdr->e_phoff = sizeof(Elf64_Ehdr);
	ehdr->e_ehsize = sizeof(Elf64_Ehdr);
	ehdr->e_phentsize = sizeof(Elf64_Phdr);
	ehdr->e_phnum = mem_chunk_cnt + 1;
	return ehdr + 1;
}

/*
 * Return CPU count for ELF header (new kernel)
 */
static int get_cpu_cnt(void)
{
	struct save_area *sa;
	int cpus = 0;

	list_for_each_entry(sa, &dump_save_areas, list)
		if (sa->prefix != 0)
			cpus++;
	return cpus;
}

/*
 * Return memory chunk count for ELF header (new kernel)
 */
static int get_mem_chunk_cnt(void)
{
	int cnt = 0;
	u64 idx;

	for_each_mem_range(idx, &memblock.physmem, &oldmem_type, NUMA_NO_NODE,
			   MEMBLOCK_NONE, NULL, 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_mem_range(idx, &memblock.physmem, &oldmem_type, NUMA_NO_NODE,
			   MEMBLOCK_NONE, &start, &end, NULL) {
		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);
	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;
}

/*
 * 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 zfcpdump mode return */
	if (!OLDMEM_BASE && ipl_info.type != IPL_TYPE_FCP_DUMP)
		return 0;
	/* If we cannot get HSA size for zfcpdump return error */
	if (ipl_info.type == IPL_TYPE_FCP_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 = 0x1000 + get_cpu_cnt() * 0x4a0 +
		mem_chunk_cnt * sizeof(Elf64_Phdr);
	hdr = kzalloc_panic(alloc_size);
	/* 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;
}
Commit	Line	Data
60a0c68d MH	1	/*
	2	* S390 kdump implementation
	3	*
	4	* Copyright IBM Corp. 2011
	5	* Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
	6	*/
	7
	8	#include <linux/crash_dump.h>
	9	#include <asm/lowcore.h>
	10	#include <linux/kernel.h>
	11	#include <linux/module.h>
	12	#include <linux/gfp.h>
	13	#include <linux/slab.h>
60a0c68d MH	14	#include <linux/bootmem.h>
60a0c68d MH	15	#include <linux/elf.h>
1a2c5840	16	#include <asm/asm-offsets.h>
50be6345	17	#include <linux/memblock.h>
4857d4bb	18	#include <asm/os_info.h>
6b563d8c HC	19	#include <asm/elf.h>
6b563d8c HC	20	#include <asm/ipl.h>
6f79d332	21	#include <asm/sclp.h>
60a0c68d MH	22
	23	#define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y)))
	24	#define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y)))
	25	#define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y))))
	26
50be6345 PH	27	static struct memblock_region oldmem_region;
	28
	29	static struct memblock_type oldmem_type = {
	30	.cnt = 1,
	31	.max = 1,
	32	.total_size = 0,
	33	.regions = &oldmem_region,
	34	};
	35
1a2c5840 MS	36	struct save_area {
	37	struct list_head list;
	38	u64 psw[2];
	39	u64 ctrs[16];
	40	u64 gprs[16];
	41	u32 acrs[16];
	42	u64 fprs[16];
	43	u32 fpc;
	44	u32 prefix;
	45	u64 todpreg;
	46	u64 timer;
	47	u64 todcmp;
	48	u64 vxrs_low[16];
	49	__vector128 vxrs_high[16];
	50	};
	51
	52	static LIST_HEAD(dump_save_areas);
	53
	54	/*
	55	* Allocate a save area
	56	*/
	57	struct save_area * __init save_area_alloc(bool is_boot_cpu)
	58	{
	59	struct save_area *sa;
	60
	61	sa = (void ) memblock_alloc(sizeof(sa), 8);
1a2c5840 MS	62	if (is_boot_cpu)
	63	list_add(&sa->list, &dump_save_areas);
	64	else
	65	list_add_tail(&sa->list, &dump_save_areas);
	66	return sa;
	67	}
	68
	69	/*
	70	* Return the address of the save area for the boot CPU
	71	*/
	72	struct save_area * __init save_area_boot_cpu(void)
	73	{
	74	if (list_empty(&dump_save_areas))
	75	return NULL;
	76	return list_first_entry(&dump_save_areas, struct save_area, list);
	77	}
	78
	79	/*
	80	* Copy CPU registers into the save area
	81	*/
	82	void __init save_area_add_regs(struct save_area sa, void regs)
	83	{
c667aeac	84	struct lowcore *lc;
1a2c5840	85
c667aeac	86	lc = (struct lowcore *)(regs - __LC_FPREGS_SAVE_AREA);
1a2c5840 MS	87	memcpy(&sa->psw, &lc->psw_save_area, sizeof(sa->psw));
	88	memcpy(&sa->ctrs, &lc->cregs_save_area, sizeof(sa->ctrs));
	89	memcpy(&sa->gprs, &lc->gpregs_save_area, sizeof(sa->gprs));
	90	memcpy(&sa->acrs, &lc->access_regs_save_area, sizeof(sa->acrs));
	91	memcpy(&sa->fprs, &lc->floating_pt_save_area, sizeof(sa->fprs));
	92	memcpy(&sa->fpc, &lc->fpt_creg_save_area, sizeof(sa->fpc));
	93	memcpy(&sa->prefix, &lc->prefixreg_save_area, sizeof(sa->prefix));
	94	memcpy(&sa->todpreg, &lc->tod_progreg_save_area, sizeof(sa->todpreg));
	95	memcpy(&sa->timer, &lc->cpu_timer_save_area, sizeof(sa->timer));
	96	memcpy(&sa->todcmp, &lc->clock_comp_save_area, sizeof(sa->todcmp));
	97	}
	98
	99	/*
	100	* Copy vector registers into the save area
	101	*/
	102	void __init save_area_add_vxrs(struct save_area sa, __vector128 vxrs)
	103	{
	104	int i;
	105
	106	/* Copy lower halves of vector registers 0-15 */
	107	for (i = 0; i < 16; i++)
	108	memcpy(&sa->vxrs_low[i], &vxrs[i].u[2], 8);
	109	/* Copy vector registers 16-31 */
	110	memcpy(sa->vxrs_high, vxrs + 16, 16 * sizeof(__vector128));
	111	}
58952942	112
191a2fa0 MH	113	/*
	114	* Return physical address for virtual address
	115	*/
	116	static inline void load_real_addr(void addr)
	117	{
	118	unsigned long real_addr;
	119
	120	asm volatile(
	121	" lra %0,0(%1)\n"
	122	" jz 0f\n"
	123	" la %0,0\n"
	124	"0:"
	125	: "=a" (real_addr) : "a" (addr) : "cc");
	126	return (void *)real_addr;
	127	}
	128
	129	/*
df9694c7	130	* Copy memory of the old, dumped system to a kernel space virtual address
191a2fa0	131	*/
df9694c7	132	int copy_oldmem_kernel(void dst, void src, size_t count)
6f79d332	133	{
df9694c7 MS	134	unsigned long from, len;
df9694c7 MS	135	void *ra;
6f79d332 MH	136	int rc;
6f79d332 MH	137
df9694c7 MS	138	while (count) {
	139	from = __pa(src);
	140	if (!OLDMEM_BASE && from < sclp.hsa_size) {
	141	/* Copy from zfcpdump HSA area */
	142	len = min(count, sclp.hsa_size - from);
	143	rc = memcpy_hsa_kernel(dst, from, len);
	144	if (rc)
	145	return rc;
	146	} else {
	147	/* Check for swapped kdump oldmem areas */
	148	if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) {
	149	from -= OLDMEM_BASE;
	150	len = min(count, OLDMEM_SIZE - from);
	151	} else if (OLDMEM_BASE && from < OLDMEM_SIZE) {
	152	len = min(count, OLDMEM_SIZE - from);
	153	from += OLDMEM_BASE;
	154	} else {
	155	len = count;
	156	}
	157	if (is_vmalloc_or_module_addr(dst)) {
	158	ra = load_real_addr(dst);
	159	len = min(PAGE_SIZE - offset_in_page(ra), len);
	160	} else {
	161	ra = dst;
	162	}
	163	if (memcpy_real(ra, (void *) from, len))
	164	return -EFAULT;
	165	}
	166	dst += len;
	167	src += len;
	168	count -= len;
6f79d332	169	}
df9694c7	170	return 0;
6f79d332 MH	171	}
	172
	173	/*
df9694c7	174	* Copy memory of the old, dumped system to a user space virtual address
60a0c68d	175	*/
df9694c7	176	int copy_oldmem_user(void __user dst, void src, size_t count)
60a0c68d	177	{
df9694c7	178	unsigned long from, len;
191a2fa0	179	int rc;
60a0c68d	180
df9694c7 MS	181	while (count) {
	182	from = __pa(src);
	183	if (!OLDMEM_BASE && from < sclp.hsa_size) {
	184	/* Copy from zfcpdump HSA area */
	185	len = min(count, sclp.hsa_size - from);
	186	rc = memcpy_hsa_user(dst, from, len);
	187	if (rc)
	188	return rc;
	189	} else {
	190	/* Check for swapped kdump oldmem areas */
	191	if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) {
	192	from -= OLDMEM_BASE;
	193	len = min(count, OLDMEM_SIZE - from);
	194	} else if (OLDMEM_BASE && from < OLDMEM_SIZE) {
	195	len = min(count, OLDMEM_SIZE - from);
	196	from += OLDMEM_BASE;
	197	} else {
	198	len = count;
	199	}
	200	rc = copy_to_user_real(dst, (void *) from, count);
	201	if (rc)
	202	return rc;
	203	}
	204	dst += len;
	205	src += len;
	206	count -= len;
	207	}
	208	return 0;
6f79d332 MH	209	}
	210
	211	/*
	212	* Copy one page from "oldmem"
	213	*/
	214	ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
	215	unsigned long offset, int userbuf)
	216	{
df9694c7 MS	217	void *src;
df9694c7 MS	218	int rc;
6f79d332 MH	219
	220	if (!csize)
	221	return 0;
df9694c7 MS	222	src = (void *) (pfn << PAGE_SHIFT) + offset;
	223	if (userbuf)
	224	rc = copy_oldmem_user((void __force __user *) buf, src, csize);
6f79d332	225	else
df9694c7 MS	226	rc = copy_oldmem_kernel((void *) buf, src, csize);
df9694c7 MS	227	return rc;
60a0c68d MH	228	}
60a0c68d MH	229
23df79da	230	/*
6f79d332	231	* Remap "oldmem" for kdump
23df79da JW	232	*
	233	* For the kdump reserved memory this functions performs a swap operation:
	234	* [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE]
	235	*/
6f79d332 MH	236	static int remap_oldmem_pfn_range_kdump(struct vm_area_struct *vma,
	237	unsigned long from, unsigned long pfn,
	238	unsigned long size, pgprot_t prot)
23df79da JW	239	{
	240	unsigned long size_old;
	241	int rc;
	242
	243	if (pfn < OLDMEM_SIZE >> PAGE_SHIFT) {
	244	size_old = min(size, OLDMEM_SIZE - (pfn << PAGE_SHIFT));
	245	rc = remap_pfn_range(vma, from,
	246	pfn + (OLDMEM_BASE >> PAGE_SHIFT),
	247	size_old, prot);
	248	if (rc \|\| size == size_old)
	249	return rc;
	250	size -= size_old;
	251	from += size_old;
	252	pfn += size_old >> PAGE_SHIFT;
	253	}
	254	return remap_pfn_range(vma, from, pfn, size, prot);
	255	}
	256
6f79d332 MH	257	/*
	258	* Remap "oldmem" for zfcpdump
	259	*
e657d8fe MH	260	* We only map available memory above HSA size. Memory below HSA size
e657d8fe MH	261	* is read on demand using the copy_oldmem_page() function.
6f79d332 MH	262	*/
	263	static int remap_oldmem_pfn_range_zfcpdump(struct vm_area_struct *vma,
	264	unsigned long from,
	265	unsigned long pfn,
	266	unsigned long size, pgprot_t prot)
	267	{
37c5f6c8	268	unsigned long hsa_end = sclp.hsa_size;
6f79d332 MH	269	unsigned long size_hsa;
6f79d332 MH	270
e657d8fe MH	271	if (pfn < hsa_end >> PAGE_SHIFT) {
e657d8fe MH	272	size_hsa = min(size, hsa_end - (pfn << PAGE_SHIFT));
6f79d332 MH	273	if (size == size_hsa)
	274	return 0;
	275	size -= size_hsa;
	276	from += size_hsa;
	277	pfn += size_hsa >> PAGE_SHIFT;
	278	}
	279	return remap_pfn_range(vma, from, pfn, size, prot);
	280	}
	281
	282	/*
	283	* Remap "oldmem" for kdump or zfcpdump
	284	*/
	285	int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from,
	286	unsigned long pfn, unsigned long size, pgprot_t prot)
	287	{
	288	if (OLDMEM_BASE)
	289	return remap_oldmem_pfn_range_kdump(vma, from, pfn, size, prot);
	290	else
	291	return remap_oldmem_pfn_range_zfcpdump(vma, from, pfn, size,
	292	prot);
	293	}
	294
60a0c68d MH	295	/*
	296	* Alloc memory and panic in case of ENOMEM
	297	*/
	298	static void *kzalloc_panic(int len)
	299	{
	300	void *rc;
	301
	302	rc = kzalloc(len, GFP_KERNEL);
	303	if (!rc)
	304	panic("s390 kdump kzalloc (%d) failed", len);
	305	return rc;
	306	}
	307
60a0c68d MH	308	/*
	309	* Initialize ELF note
	310	*/
1a2c5840 MS	311	static void nt_init_name(void buf, Elf64_Word type, void *desc, int d_len,
1a2c5840 MS	312	const char *name)
60a0c68d MH	313	{
	314	Elf64_Nhdr *note;
	315	u64 len;
	316
	317	note = (Elf64_Nhdr *)buf;
	318	note->n_namesz = strlen(name) + 1;
	319	note->n_descsz = d_len;
	320	note->n_type = type;
	321	len = sizeof(Elf64_Nhdr);
	322
	323	memcpy(buf + len, name, note->n_namesz);
	324	len = roundup(len + note->n_namesz, 4);
	325
	326	memcpy(buf + len, desc, note->n_descsz);
	327	len = roundup(len + note->n_descsz, 4);
	328
	329	return PTR_ADD(buf, len);
	330	}
	331
1a2c5840	332	static inline void nt_init(void buf, Elf64_Word type, void *desc, int d_len)
60a0c68d	333	{
1a2c5840	334	return nt_init_name(buf, type, desc, d_len, KEXEC_CORE_NOTE_NAME);
60a0c68d MH	335	}
	336
	337	/*
1a2c5840	338	* Fill ELF notes for one CPU with save area registers
60a0c68d	339	*/
1a2c5840	340	static void fill_cpu_elf_notes(void ptr, int cpu, struct save_area *sa)
60a0c68d	341	{
1a2c5840	342	struct elf_prstatus nt_prstatus;
60a0c68d MH	343	elf_fpregset_t nt_fpregset;
60a0c68d MH	344
1a2c5840 MS	345	/* Prepare prstatus note */
	346	memset(&nt_prstatus, 0, sizeof(nt_prstatus));
	347	memcpy(&nt_prstatus.pr_reg.gprs, sa->gprs, sizeof(sa->gprs));
	348	memcpy(&nt_prstatus.pr_reg.psw, sa->psw, sizeof(sa->psw));
	349	memcpy(&nt_prstatus.pr_reg.acrs, sa->acrs, sizeof(sa->acrs));
	350	nt_prstatus.pr_pid = cpu;
	351	/* Prepare fpregset (floating point) note */
60a0c68d	352	memset(&nt_fpregset, 0, sizeof(nt_fpregset));
1a2c5840 MS	353	memcpy(&nt_fpregset.fpc, &sa->fpc, sizeof(sa->fpc));
	354	memcpy(&nt_fpregset.fprs, &sa->fprs, sizeof(sa->fprs));
	355	/* Create ELF notes for the CPU */
	356	ptr = nt_init(ptr, NT_PRSTATUS, &nt_prstatus, sizeof(nt_prstatus));
	357	ptr = nt_init(ptr, NT_PRFPREG, &nt_fpregset, sizeof(nt_fpregset));
	358	ptr = nt_init(ptr, NT_S390_TIMER, &sa->timer, sizeof(sa->timer));
	359	ptr = nt_init(ptr, NT_S390_TODCMP, &sa->todcmp, sizeof(sa->todcmp));
	360	ptr = nt_init(ptr, NT_S390_TODPREG, &sa->todpreg, sizeof(sa->todpreg));
	361	ptr = nt_init(ptr, NT_S390_CTRS, &sa->ctrs, sizeof(sa->ctrs));
	362	ptr = nt_init(ptr, NT_S390_PREFIX, &sa->prefix, sizeof(sa->prefix));
	363	if (MACHINE_HAS_VX) {
	364	ptr = nt_init(ptr, NT_S390_VXRS_HIGH,
	365	&sa->vxrs_high, sizeof(sa->vxrs_high));
	366	ptr = nt_init(ptr, NT_S390_VXRS_LOW,
	367	&sa->vxrs_low, sizeof(sa->vxrs_low));
a62bc073	368	}
60a0c68d MH	369	return ptr;
	370	}
	371
	372	/*
	373	* Initialize prpsinfo note (new kernel)
	374	*/
	375	static void nt_prpsinfo(void ptr)
	376	{
	377	struct elf_prpsinfo prpsinfo;
	378
	379	memset(&prpsinfo, 0, sizeof(prpsinfo));
	380	prpsinfo.pr_sname = 'R';
	381	strcpy(prpsinfo.pr_fname, "vmlinux");
1a2c5840	382	return nt_init(ptr, NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo));
60a0c68d MH	383	}
	384
	385	/*
4857d4bb	386	* Get vmcoreinfo using lowcore->vmcore_info (new kernel)
60a0c68d	387	*/
4857d4bb	388	static void get_vmcoreinfo_old(unsigned long size)
60a0c68d MH	389	{
	390	char nt_name[11], *vmcoreinfo;
	391	Elf64_Nhdr note;
	392	void *addr;
	393
df9694c7	394	if (copy_oldmem_kernel(&addr, &S390_lowcore.vmcore_info, sizeof(addr)))
4857d4bb	395	return NULL;
60a0c68d	396	memset(nt_name, 0, sizeof(nt_name));
df9694c7	397	if (copy_oldmem_kernel(&note, addr, sizeof(note)))
4857d4bb	398	return NULL;
df9694c7 MS	399	if (copy_oldmem_kernel(nt_name, addr + sizeof(note),
df9694c7 MS	400	sizeof(nt_name) - 1))
4857d4bb	401	return NULL;
60a0c68d	402	if (strcmp(nt_name, "VMCOREINFO") != 0)
4857d4bb MH	403	return NULL;
4857d4bb MH	404	vmcoreinfo = kzalloc_panic(note.n_descsz);
df9694c7	405	if (copy_oldmem_kernel(vmcoreinfo, addr + 24, note.n_descsz))
4857d4bb MH	406	return NULL;
	407	*size = note.n_descsz;
	408	return vmcoreinfo;
	409	}
	410
	411	/*
	412	* Initialize vmcoreinfo note (new kernel)
	413	*/
	414	static void nt_vmcoreinfo(void ptr)
	415	{
	416	unsigned long size;
	417	void *vmcoreinfo;
	418
	419	vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size);
	420	if (!vmcoreinfo)
	421	vmcoreinfo = get_vmcoreinfo_old(&size);
	422	if (!vmcoreinfo)
60a0c68d	423	return ptr;
1a2c5840	424	return nt_init_name(ptr, 0, vmcoreinfo, size, "VMCOREINFO");
60a0c68d MH	425	}
	426
	427	/*
	428	* Initialize ELF header (new kernel)
	429	*/
	430	static void ehdr_init(Elf64_Ehdr ehdr, int mem_chunk_cnt)
	431	{
	432	memset(ehdr, 0, sizeof(*ehdr));
	433	memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
	434	ehdr->e_ident[EI_CLASS] = ELFCLASS64;
	435	ehdr->e_ident[EI_DATA] = ELFDATA2MSB;
	436	ehdr->e_ident[EI_VERSION] = EV_CURRENT;
	437	memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD);
	438	ehdr->e_type = ET_CORE;
	439	ehdr->e_machine = EM_S390;
	440	ehdr->e_version = EV_CURRENT;
	441	ehdr->e_phoff = sizeof(Elf64_Ehdr);
	442	ehdr->e_ehsize = sizeof(Elf64_Ehdr);
	443	ehdr->e_phentsize = sizeof(Elf64_Phdr);
	444	ehdr->e_phnum = mem_chunk_cnt + 1;
	445	return ehdr + 1;
	446	}
	447
	448	/*
	449	* Return CPU count for ELF header (new kernel)
	450	*/
	451	static int get_cpu_cnt(void)
	452	{
1a2c5840 MS	453	struct save_area *sa;
1a2c5840 MS	454	int cpus = 0;
60a0c68d	455
1a2c5840 MS	456	list_for_each_entry(sa, &dump_save_areas, list)
	457	if (sa->prefix != 0)
	458	cpus++;
60a0c68d MH	459	return cpus;
	460	}
	461
	462	/*
	463	* Return memory chunk count for ELF header (new kernel)
	464	*/
	465	static int get_mem_chunk_cnt(void)
	466	{
50be6345 PH	467	int cnt = 0;
	468	u64 idx;
	469
3c4aac86 AK	470	for_each_mem_range(idx, &memblock.physmem, &oldmem_type, NUMA_NO_NODE,
3c4aac86 AK	471	MEMBLOCK_NONE, NULL, NULL, NULL)
60a0c68d	472	cnt++;
60a0c68d MH	473	return cnt;
	474	}
	475
60a0c68d MH	476	/*
	477	* Initialize ELF loads (new kernel)
	478	*/
50be6345	479	static void loads_init(Elf64_Phdr *phdr, u64 loads_offset)
60a0c68d	480	{
50be6345 PH	481	phys_addr_t start, end;
50be6345 PH	482	u64 idx;
60a0c68d	483
3c4aac86 AK	484	for_each_mem_range(idx, &memblock.physmem, &oldmem_type, NUMA_NO_NODE,
3c4aac86 AK	485	MEMBLOCK_NONE, &start, &end, NULL) {
50be6345	486	phdr->p_filesz = end - start;
60a0c68d	487	phdr->p_type = PT_LOAD;
50be6345 PH	488	phdr->p_offset = start;
	489	phdr->p_vaddr = start;
	490	phdr->p_paddr = start;
	491	phdr->p_memsz = end - start;
60a0c68d MH	492	phdr->p_flags = PF_R \| PF_W \| PF_X;
	493	phdr->p_align = PAGE_SIZE;
	494	phdr++;
	495	}
60a0c68d MH	496	}
	497
	498	/*
	499	* Initialize notes (new kernel)
	500	*/
	501	static void notes_init(Elf64_Phdr phdr, void *ptr, u64 notes_offset)
	502	{
1a2c5840	503	struct save_area *sa;
60a0c68d	504	void *ptr_start = ptr;
1a2c5840	505	int cpu;
60a0c68d MH	506
	507	ptr = nt_prpsinfo(ptr);
	508
1a2c5840 MS	509	cpu = 1;
	510	list_for_each_entry(sa, &dump_save_areas, list)
	511	if (sa->prefix != 0)
	512	ptr = fill_cpu_elf_notes(ptr, cpu++, sa);
60a0c68d MH	513	ptr = nt_vmcoreinfo(ptr);
	514	memset(phdr, 0, sizeof(*phdr));
	515	phdr->p_type = PT_NOTE;
97b0f6f9	516	phdr->p_offset = notes_offset;
60a0c68d MH	517	phdr->p_filesz = (unsigned long) PTR_SUB(ptr, ptr_start);
	518	phdr->p_memsz = phdr->p_filesz;
	519	return ptr;
	520	}
	521
	522	/*
	523	* Create ELF core header (new kernel)
	524	*/
97b0f6f9	525	int elfcorehdr_alloc(unsigned long long addr, unsigned long long size)
60a0c68d MH	526	{
	527	Elf64_Phdr phdr_notes, phdr_loads;
	528	int mem_chunk_cnt;
	529	void ptr, hdr;
	530	u32 alloc_size;
	531	u64 hdr_off;
	532
6f79d332 MH	533	/* If we are not in kdump or zfcpdump mode return */
6f79d332 MH	534	if (!OLDMEM_BASE && ipl_info.type != IPL_TYPE_FCP_DUMP)
97b0f6f9	535	return 0;
e657d8fe	536	/* If we cannot get HSA size for zfcpdump return error */
37c5f6c8	537	if (ipl_info.type == IPL_TYPE_FCP_DUMP && !sclp.hsa_size)
e657d8fe	538	return -ENODEV;
50be6345 PH	539
	540	/* For kdump, exclude previous crashkernel memory */
	541	if (OLDMEM_BASE) {
	542	oldmem_region.base = OLDMEM_BASE;
	543	oldmem_region.size = OLDMEM_SIZE;
	544	oldmem_type.total_size = OLDMEM_SIZE;
	545	}
	546
60a0c68d MH	547	mem_chunk_cnt = get_mem_chunk_cnt();
60a0c68d MH	548
a62bc073	549	alloc_size = 0x1000 + get_cpu_cnt() * 0x4a0 +
60a0c68d MH	550	mem_chunk_cnt * sizeof(Elf64_Phdr);
	551	hdr = kzalloc_panic(alloc_size);
	552	/* Init elf header */
	553	ptr = ehdr_init(hdr, mem_chunk_cnt);
	554	/* Init program headers */
	555	phdr_notes = ptr;
	556	ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr));
	557	phdr_loads = ptr;
	558	ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr) * mem_chunk_cnt);
	559	/* Init notes */
	560	hdr_off = PTR_DIFF(ptr, hdr);
	561	ptr = notes_init(phdr_notes, ptr, ((unsigned long) hdr) + hdr_off);
	562	/* Init loads */
	563	hdr_off = PTR_DIFF(ptr, hdr);
97b0f6f9 MH	564	loads_init(phdr_loads, hdr_off);
97b0f6f9 MH	565	*addr = (unsigned long long) hdr;
97b0f6f9 MH	566	*size = (unsigned long long) hdr_off;
	567	BUG_ON(elfcorehdr_size > alloc_size);
	568	return 0;
60a0c68d MH	569	}
	570
	571	/*
97b0f6f9	572	* Free ELF core header (new kernel)
60a0c68d	573	*/
97b0f6f9	574	void elfcorehdr_free(unsigned long long addr)
60a0c68d	575	{
97b0f6f9 MH	576	kfree((void *)(unsigned long)addr);
	577	}
	578
	579	/*
	580	* Read from ELF header
	581	*/
	582	ssize_t elfcorehdr_read(char buf, size_t count, u64 ppos)
	583	{
	584	void src = (void )(unsigned long)*ppos;
	585
97b0f6f9 MH	586	memcpy(buf, src, count);
	587	*ppos += count;
	588	return count;
60a0c68d MH	589	}
60a0c68d MH	590
97b0f6f9 MH	591	/*
	592	* Read from ELF notes data
	593	*/
	594	ssize_t elfcorehdr_read_notes(char buf, size_t count, u64 ppos)
	595	{
	596	void src = (void )(unsigned long)*ppos;
97b0f6f9	597
8a07dd02	598	memcpy(buf, src, count);
97b0f6f9 MH	599	*ppos += count;
	600	return count;
	601	}