drivers/soc/qcom/msm_minidump.c - kernel/msm-4.9 - Gitiles

 /* Copyright (c) 2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */
 #define pr_fmt(fmt) "Minidump: " fmt

 #include <linux/init.h>
 #include <linux/export.h>
 #include <linux/kernel.h>
 #include <linux/err.h>
 #include <linux/elf.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <soc/qcom/smem.h>
 #include <soc/qcom/scm.h>
 #include <soc/qcom/minidump.h>


 #define MAX_NUM_ENTRIES		200
 #define SMEM_ENTRY_SIZE		32
 #define MAX_MEM_LENGTH		(SMEM_ENTRY_SIZE * MAX_NUM_ENTRIES)
 #define MAX_STRTBL_SIZE		(MAX_NUM_ENTRIES * MAX_NAME_LENGTH)
 #define SMEM_MINIDUMP_TABLE_ID	602

 /* Bootloader Minidump table */
 struct md_smem_table {
 	u32	version;
 	u32	smem_length;
 	u64	next_avail_offset;
 	char	reserved[MAX_NAME_LENGTH];
 	u64	*region_start;
 };

 /* Bootloader Minidump region */
 struct md_smem_region {
 	char	name[MAX_NAME_LENGTH];
 	u64	address;
 	u64	size;
 };

 /* md_table: APPS minidump table
  * @num_regions: Number of entries registered
  * @region_base_offset: APPS region start offset smem table
  * @md_smem_table: Pointer smem table
  * @region: Pointer to APPS region in smem table
  * @entry: All registered client entries.
  */

 struct md_table {
 	u32			num_regions;
 	u32			region_base_offset;
 	struct md_smem_table	*md_smem_table;
 	struct md_smem_region	*region;
 	struct md_region	entry[MAX_NUM_ENTRIES];
 };

 /*
  * md_elfhdr: Minidump table elf header
  * @md_ehdr: elf main header
  * @shdr: Section header
  * @phdr: Program header
  * @elf_offset: section offset in elf
  * @strtable_idx: string table current index position
  */
 struct md_elfhdr {
 	struct elfhdr	*md_ehdr;
 	struct elf_shdr	*shdr;
 	struct elf_phdr	*phdr;
 	u64		elf_offset;
 	u64		strtable_idx;
 };

 /* Protect elfheader and smem table from deferred calls contention */
 static DEFINE_SPINLOCK(mdt_lock);
 static struct md_table	minidump_table;
 static struct md_elfhdr	minidump_elfheader;

 bool minidump_enabled;
 static unsigned int pendings;
 static unsigned int region_idx = 1; /* First entry is ELF header*/

 static inline char *elf_lookup_string(struct elfhdr *hdr, int offset)
 {
 	char *strtab = elf_str_table(hdr);

 	if ((strtab == NULL) || (minidump_elfheader.strtable_idx < offset))
 		return NULL;
 	return strtab + offset;
 }

 static inline unsigned int set_section_name(const char *name)
 {
 	char *strtab = elf_str_table(minidump_elfheader.md_ehdr);
 	int idx = minidump_elfheader.strtable_idx;
 	int ret = 0;

 	if ((strtab == NULL) || (name == NULL))
 		return 0;

 	ret = idx;
 	idx += strlcpy((strtab + idx), name, MAX_NAME_LENGTH);
 	minidump_elfheader.strtable_idx = idx + 1;

 	return ret;
 }

 /* return 1 if name already exists */
 static inline bool md_check_name(const char *name)
 {
 	struct md_region *mde = minidump_table.entry;
 	int i, regno = minidump_table.num_regions;

 	for (i = 0; i < regno; i++, mde++)
 		if (!strcmp(mde->name, name))
 			return true;
 	return false;
 }

 /* Update Mini dump table in SMEM */
 static int md_update_smem_table(const struct md_region *entry)
 {
 	struct md_smem_region *mdr;
 	struct elfhdr *hdr = minidump_elfheader.md_ehdr;
 	struct elf_shdr *shdr = elf_section(hdr, hdr->e_shnum++);
 	struct elf_phdr *phdr = elf_program(hdr, hdr->e_phnum++);

 	mdr = &minidump_table.region[region_idx++];

 	strlcpy(mdr->name, entry->name, sizeof(mdr->name));
 	mdr->address = entry->phys_addr;
 	mdr->size = entry->size;

 	/* Update elf header */
 	shdr->sh_type = SHT_PROGBITS;
 	shdr->sh_name = set_section_name(mdr->name);
 	shdr->sh_addr = (elf_addr_t)entry->virt_addr;
 	shdr->sh_size = mdr->size;
 	shdr->sh_flags = SHF_WRITE;
 	shdr->sh_offset = minidump_elfheader.elf_offset;
 	shdr->sh_entsize = 0;

 	phdr->p_type = PT_LOAD;
 	phdr->p_offset = minidump_elfheader.elf_offset;
 	phdr->p_vaddr = entry->virt_addr;
 	phdr->p_paddr = entry->phys_addr;
 	phdr->p_filesz = phdr->p_memsz =  mdr->size;
 	phdr->p_flags = PF_R | PF_W;

 	minidump_elfheader.elf_offset += shdr->sh_size;

 	return 0;
 }

 int msm_minidump_add_region(const struct md_region *entry)
 {
 	u32 entries;
 	struct md_region *mdr;
 	int ret = 0;

 	if (!entry)
 		return -EINVAL;

 	if (((strlen(entry->name) > MAX_NAME_LENGTH) ||
 		 md_check_name(entry->name)) && !entry->virt_addr) {
 		pr_err("Invalid entry details\n");
 		return -EINVAL;
 	}

 	if (!IS_ALIGNED(entry->size, 4)) {
 		pr_err("size should be 4 byte aligned\n");
 		return -EINVAL;
 	}

 	spin_lock(&mdt_lock);
 	entries = minidump_table.num_regions;
 	if (entries >= MAX_NUM_ENTRIES) {
 		pr_err("Maximum entries reached.\n");
 		spin_unlock(&mdt_lock);
 		return -ENOMEM;
 	}

 	mdr = &minidump_table.entry[entries];
 	strlcpy(mdr->name, entry->name, sizeof(mdr->name));
 	mdr->virt_addr = entry->virt_addr;
 	mdr->phys_addr = entry->phys_addr;
 	mdr->size = entry->size;
 	mdr->id = entry->id;

 	minidump_table.num_regions = entries + 1;

 	if (minidump_enabled)
 		ret = md_update_smem_table(entry);
 	else
 		pendings++;

 	spin_unlock(&mdt_lock);

 	pr_debug("Minidump: added %s to %s list\n",
 			 mdr->name, minidump_enabled ? "":"pending");
 	return ret;
 }
 EXPORT_SYMBOL(msm_minidump_add_region);

 static int msm_minidump_add_header(void)
 {
 	struct md_smem_region *mdreg = &minidump_table.region[0];
 	struct elfhdr *md_ehdr;
 	struct elf_shdr *shdr;
 	struct elf_phdr *phdr;
 	unsigned int strtbl_off, elfh_size, phdr_off;
 	char *banner;

 	/* Header buffer contains:
 	 * elf header, MAX_NUM_ENTRIES+1 of section and program elf headers,
 	 * string table section and linux banner.
 	 */
 	elfh_size = sizeof(*md_ehdr) + MAX_STRTBL_SIZE + MAX_MEM_LENGTH +
 		((sizeof(*shdr) + sizeof(*phdr)) * (MAX_NUM_ENTRIES + 1));

 	minidump_elfheader.md_ehdr = kzalloc(elfh_size, GFP_KERNEL);
 	if (!minidump_elfheader.md_ehdr)
 		return -ENOMEM;

 	strlcpy(mdreg->name, "KELF_HEADER", sizeof(mdreg->name));
 	mdreg->address = virt_to_phys(minidump_elfheader.md_ehdr);
 	mdreg->size = elfh_size;

 	md_ehdr = minidump_elfheader.md_ehdr;
 	/* Assign section/program headers offset */
 	minidump_elfheader.shdr = shdr = (struct elf_shdr *)(md_ehdr + 1);
 	minidump_elfheader.phdr = phdr =
 				 (struct elf_phdr *)(shdr + MAX_NUM_ENTRIES);
 	phdr_off = sizeof(*md_ehdr) + (sizeof(*shdr) * MAX_NUM_ENTRIES);

 	memcpy(md_ehdr->e_ident, ELFMAG, SELFMAG);
 	md_ehdr->e_ident[EI_CLASS] = ELF_CLASS;
 	md_ehdr->e_ident[EI_DATA] = ELF_DATA;
 	md_ehdr->e_ident[EI_VERSION] = EV_CURRENT;
 	md_ehdr->e_ident[EI_OSABI] = ELF_OSABI;
 	md_ehdr->e_type = ET_CORE;
 	md_ehdr->e_machine  = ELF_ARCH;
 	md_ehdr->e_version = EV_CURRENT;
 	md_ehdr->e_ehsize = sizeof(*md_ehdr);
 	md_ehdr->e_phoff = phdr_off;
 	md_ehdr->e_phentsize = sizeof(*phdr);
 	md_ehdr->e_shoff = sizeof(*md_ehdr);
 	md_ehdr->e_shentsize = sizeof(*shdr);
 	md_ehdr->e_shstrndx = 1;

 	minidump_elfheader.elf_offset = elfh_size;

 	/*
 	 * First section header should be NULL,
 	 * 2nd section is string table.
 	 */
 	minidump_elfheader.strtable_idx = 1;
 	strtbl_off = sizeof(*md_ehdr) +
 			((sizeof(*phdr) + sizeof(*shdr)) * MAX_NUM_ENTRIES);
 	shdr++;
 	shdr->sh_type = SHT_STRTAB;
 	shdr->sh_offset = (elf_addr_t)strtbl_off;
 	shdr->sh_size = MAX_STRTBL_SIZE;
 	shdr->sh_entsize = 0;
 	shdr->sh_flags = 0;
 	shdr->sh_name = set_section_name("STR_TBL");
 	shdr++;

 	/* 3rd section is for minidump_table VA, used by parsers */
 	shdr->sh_type = SHT_PROGBITS;
 	shdr->sh_entsize = 0;
 	shdr->sh_flags = 0;
 	shdr->sh_addr = (elf_addr_t)&minidump_table;
 	shdr->sh_name = set_section_name("minidump_table");
 	shdr++;

 	/* 4th section is linux banner */
 	banner = (char *)md_ehdr + strtbl_off + MAX_STRTBL_SIZE;
 	strlcpy(banner, linux_banner, MAX_MEM_LENGTH);

 	shdr->sh_type = SHT_PROGBITS;
 	shdr->sh_offset = (elf_addr_t)(strtbl_off + MAX_STRTBL_SIZE);
 	shdr->sh_size = strlen(linux_banner) + 1;
 	shdr->sh_addr = (elf_addr_t)linux_banner;
 	shdr->sh_entsize = 0;
 	shdr->sh_flags = SHF_WRITE;
 	shdr->sh_name = set_section_name("linux_banner");

 	phdr->p_type = PT_LOAD;
 	phdr->p_offset = (elf_addr_t)(strtbl_off + MAX_STRTBL_SIZE);
 	phdr->p_vaddr = (elf_addr_t)linux_banner;
 	phdr->p_paddr = virt_to_phys(linux_banner);
 	phdr->p_filesz = phdr->p_memsz = strlen(linux_banner) + 1;
 	phdr->p_flags = PF_R | PF_W;

 	/* Update headers count*/
 	md_ehdr->e_phnum = 1;
 	md_ehdr->e_shnum = 4;

 	return 0;
 }

 static int __init msm_minidump_init(void)
 {
 	unsigned int i, size;
 	struct md_region *mdr;
 	struct md_smem_table *smem_table;

 	/* Get Minidump table */
 	smem_table = smem_get_entry(SMEM_MINIDUMP_TABLE_ID, &size, 0,
 					SMEM_ANY_HOST_FLAG);
 	if (IS_ERR_OR_NULL(smem_table)) {
 		pr_err("SMEM is not initialized.\n");
 		return -ENODEV;
 	}

 	if ((smem_table->next_avail_offset + MAX_MEM_LENGTH) >
 		 smem_table->smem_length) {
 		pr_err("SMEM memory not available.\n");
 		return -ENOMEM;
 	}

 	/* Get next_avail_offset and update it to reserve memory */
 	minidump_table.region_base_offset = smem_table->next_avail_offset;
 	minidump_table.region = (struct md_smem_region *)((uintptr_t)smem_table
 				+ minidump_table.region_base_offset);

 	smem_table->next_avail_offset =
 			minidump_table.region_base_offset + MAX_MEM_LENGTH;
 	minidump_table.md_smem_table = smem_table;

 	msm_minidump_add_header();

 	/* Add pending entries to smem table */
 	spin_lock(&mdt_lock);
 	minidump_enabled = true;

 	for (i = 0; i < pendings; i++) {
 		mdr = &minidump_table.entry[i];
 		if (md_update_smem_table(mdr)) {
 			pr_err("Unable to add entry %s to smem table\n",
 				mdr->name);
 			spin_unlock(&mdt_lock);
 			return -ENOENT;
 		}
 	}

 	pendings = 0;
 	spin_unlock(&mdt_lock);

 	pr_info("Enabled, region base:%d, region 0x%pK\n",
 		 minidump_table.region_base_offset, minidump_table.region);

 	return 0;
 }
 subsys_initcall(msm_minidump_init)
	/* Copyright (c) 2017, The Linux Foundation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/
	#define pr_fmt(fmt) "Minidump: " fmt

	#include <linux/init.h>
	#include <linux/export.h>
	#include <linux/kernel.h>
	#include <linux/err.h>
	#include <linux/elf.h>
	#include <linux/errno.h>
	#include <linux/string.h>
	#include <linux/slab.h>
	#include <soc/qcom/smem.h>
	#include <soc/qcom/scm.h>
	#include <soc/qcom/minidump.h>


	#define MAX_NUM_ENTRIES 200
	#define SMEM_ENTRY_SIZE 32
	#define MAX_MEM_LENGTH (SMEM_ENTRY_SIZE * MAX_NUM_ENTRIES)
	#define MAX_STRTBL_SIZE (MAX_NUM_ENTRIES * MAX_NAME_LENGTH)
	#define SMEM_MINIDUMP_TABLE_ID 602

	/* Bootloader Minidump table */
	struct md_smem_table {
	u32 version;
	u32 smem_length;
	u64 next_avail_offset;
	char reserved[MAX_NAME_LENGTH];
	u64 *region_start;
	};

	/* Bootloader Minidump region */
	struct md_smem_region {
	char name[MAX_NAME_LENGTH];
	u64 address;
	u64 size;
	};

	/* md_table: APPS minidump table
	* @num_regions: Number of entries registered
	* @region_base_offset: APPS region start offset smem table
	* @md_smem_table: Pointer smem table
	* @region: Pointer to APPS region in smem table
	* @entry: All registered client entries.
	*/

	struct md_table {
	u32 num_regions;
	u32 region_base_offset;
	struct md_smem_table *md_smem_table;
	struct md_smem_region *region;
	struct md_region entry[MAX_NUM_ENTRIES];
	};

	/*
	* md_elfhdr: Minidump table elf header
	* @md_ehdr: elf main header
	* @shdr: Section header
	* @phdr: Program header
	* @elf_offset: section offset in elf
	* @strtable_idx: string table current index position
	*/
	struct md_elfhdr {
	struct elfhdr *md_ehdr;
	struct elf_shdr *shdr;
	struct elf_phdr *phdr;
	u64 elf_offset;
	u64 strtable_idx;
	};

	/* Protect elfheader and smem table from deferred calls contention */
	static DEFINE_SPINLOCK(mdt_lock);
	static struct md_table minidump_table;
	static struct md_elfhdr minidump_elfheader;

	bool minidump_enabled;
	static unsigned int pendings;
	static unsigned int region_idx = 1; /* First entry is ELF header*/

	static inline char elf_lookup_string(struct elfhdr hdr, int offset)
	{
	char *strtab = elf_str_table(hdr);

	if ((strtab == NULL) \|\| (minidump_elfheader.strtable_idx < offset))
	return NULL;
	return strtab + offset;
	}

	static inline unsigned int set_section_name(const char *name)
	{
	char *strtab = elf_str_table(minidump_elfheader.md_ehdr);
	int idx = minidump_elfheader.strtable_idx;
	int ret = 0;

	if ((strtab == NULL) \|\| (name == NULL))
	return 0;

	ret = idx;
	idx += strlcpy((strtab + idx), name, MAX_NAME_LENGTH);
	minidump_elfheader.strtable_idx = idx + 1;

	return ret;
	}

	/* return 1 if name already exists */
	static inline bool md_check_name(const char *name)
	{
	struct md_region *mde = minidump_table.entry;
	int i, regno = minidump_table.num_regions;

	for (i = 0; i < regno; i++, mde++)
	if (!strcmp(mde->name, name))
	return true;
	return false;
	}

	/* Update Mini dump table in SMEM */
	static int md_update_smem_table(const struct md_region *entry)
	{
	struct md_smem_region *mdr;
	struct elfhdr *hdr = minidump_elfheader.md_ehdr;
	struct elf_shdr *shdr = elf_section(hdr, hdr->e_shnum++);
	struct elf_phdr *phdr = elf_program(hdr, hdr->e_phnum++);

	mdr = &minidump_table.region[region_idx++];

	strlcpy(mdr->name, entry->name, sizeof(mdr->name));
	mdr->address = entry->phys_addr;
	mdr->size = entry->size;

	/* Update elf header */
	shdr->sh_type = SHT_PROGBITS;
	shdr->sh_name = set_section_name(mdr->name);
	shdr->sh_addr = (elf_addr_t)entry->virt_addr;
	shdr->sh_size = mdr->size;
	shdr->sh_flags = SHF_WRITE;
	shdr->sh_offset = minidump_elfheader.elf_offset;
	shdr->sh_entsize = 0;

	phdr->p_type = PT_LOAD;
	phdr->p_offset = minidump_elfheader.elf_offset;
	phdr->p_vaddr = entry->virt_addr;
	phdr->p_paddr = entry->phys_addr;
	phdr->p_filesz = phdr->p_memsz = mdr->size;
	phdr->p_flags = PF_R \| PF_W;

	minidump_elfheader.elf_offset += shdr->sh_size;

	return 0;
	}

	int msm_minidump_add_region(const struct md_region *entry)
	{
	u32 entries;
	struct md_region *mdr;
	int ret = 0;

	if (!entry)
	return -EINVAL;

	if (((strlen(entry->name) > MAX_NAME_LENGTH) \|\|
	md_check_name(entry->name)) && !entry->virt_addr) {
	pr_err("Invalid entry details\n");
	return -EINVAL;
	}

	if (!IS_ALIGNED(entry->size, 4)) {
	pr_err("size should be 4 byte aligned\n");
	return -EINVAL;
	}

	spin_lock(&mdt_lock);
	entries = minidump_table.num_regions;
	if (entries >= MAX_NUM_ENTRIES) {
	pr_err("Maximum entries reached.\n");
	spin_unlock(&mdt_lock);
	return -ENOMEM;
	}

	mdr = &minidump_table.entry[entries];
	strlcpy(mdr->name, entry->name, sizeof(mdr->name));
	mdr->virt_addr = entry->virt_addr;
	mdr->phys_addr = entry->phys_addr;
	mdr->size = entry->size;
	mdr->id = entry->id;

	minidump_table.num_regions = entries + 1;

	if (minidump_enabled)
	ret = md_update_smem_table(entry);
	else
	pendings++;

	spin_unlock(&mdt_lock);

	pr_debug("Minidump: added %s to %s list\n",
	mdr->name, minidump_enabled ? "":"pending");
	return ret;
	}
	EXPORT_SYMBOL(msm_minidump_add_region);

	static int msm_minidump_add_header(void)
	{
	struct md_smem_region *mdreg = &minidump_table.region[0];
	struct elfhdr *md_ehdr;
	struct elf_shdr *shdr;
	struct elf_phdr *phdr;
	unsigned int strtbl_off, elfh_size, phdr_off;
	char *banner;

	/* Header buffer contains:
	* elf header, MAX_NUM_ENTRIES+1 of section and program elf headers,
	* string table section and linux banner.
	*/
	elfh_size = sizeof(*md_ehdr) + MAX_STRTBL_SIZE + MAX_MEM_LENGTH +
	((sizeof(shdr) + sizeof(phdr)) * (MAX_NUM_ENTRIES + 1));

	minidump_elfheader.md_ehdr = kzalloc(elfh_size, GFP_KERNEL);
	if (!minidump_elfheader.md_ehdr)
	return -ENOMEM;

	strlcpy(mdreg->name, "KELF_HEADER", sizeof(mdreg->name));
	mdreg->address = virt_to_phys(minidump_elfheader.md_ehdr);
	mdreg->size = elfh_size;

	md_ehdr = minidump_elfheader.md_ehdr;
	/* Assign section/program headers offset */
	minidump_elfheader.shdr = shdr = (struct elf_shdr *)(md_ehdr + 1);
	minidump_elfheader.phdr = phdr =
	(struct elf_phdr *)(shdr + MAX_NUM_ENTRIES);
	phdr_off = sizeof(md_ehdr) + (sizeof(shdr) * MAX_NUM_ENTRIES);

	memcpy(md_ehdr->e_ident, ELFMAG, SELFMAG);
	md_ehdr->e_ident[EI_CLASS] = ELF_CLASS;
	md_ehdr->e_ident[EI_DATA] = ELF_DATA;
	md_ehdr->e_ident[EI_VERSION] = EV_CURRENT;
	md_ehdr->e_ident[EI_OSABI] = ELF_OSABI;
	md_ehdr->e_type = ET_CORE;
	md_ehdr->e_machine = ELF_ARCH;
	md_ehdr->e_version = EV_CURRENT;
	md_ehdr->e_ehsize = sizeof(*md_ehdr);
	md_ehdr->e_phoff = phdr_off;
	md_ehdr->e_phentsize = sizeof(*phdr);
	md_ehdr->e_shoff = sizeof(*md_ehdr);
	md_ehdr->e_shentsize = sizeof(*shdr);
	md_ehdr->e_shstrndx = 1;

	minidump_elfheader.elf_offset = elfh_size;

	/*
	* First section header should be NULL,
	* 2nd section is string table.
	*/
	minidump_elfheader.strtable_idx = 1;
	strtbl_off = sizeof(*md_ehdr) +
	((sizeof(phdr) + sizeof(shdr)) * MAX_NUM_ENTRIES);
	shdr++;
	shdr->sh_type = SHT_STRTAB;
	shdr->sh_offset = (elf_addr_t)strtbl_off;
	shdr->sh_size = MAX_STRTBL_SIZE;
	shdr->sh_entsize = 0;
	shdr->sh_flags = 0;
	shdr->sh_name = set_section_name("STR_TBL");
	shdr++;

	/* 3rd section is for minidump_table VA, used by parsers */
	shdr->sh_type = SHT_PROGBITS;
	shdr->sh_entsize = 0;
	shdr->sh_flags = 0;
	shdr->sh_addr = (elf_addr_t)&minidump_table;
	shdr->sh_name = set_section_name("minidump_table");
	shdr++;

	/* 4th section is linux banner */
	banner = (char *)md_ehdr + strtbl_off + MAX_STRTBL_SIZE;
	strlcpy(banner, linux_banner, MAX_MEM_LENGTH);

	shdr->sh_type = SHT_PROGBITS;
	shdr->sh_offset = (elf_addr_t)(strtbl_off + MAX_STRTBL_SIZE);
	shdr->sh_size = strlen(linux_banner) + 1;
	shdr->sh_addr = (elf_addr_t)linux_banner;
	shdr->sh_entsize = 0;
	shdr->sh_flags = SHF_WRITE;
	shdr->sh_name = set_section_name("linux_banner");

	phdr->p_type = PT_LOAD;
	phdr->p_offset = (elf_addr_t)(strtbl_off + MAX_STRTBL_SIZE);
	phdr->p_vaddr = (elf_addr_t)linux_banner;
	phdr->p_paddr = virt_to_phys(linux_banner);
	phdr->p_filesz = phdr->p_memsz = strlen(linux_banner) + 1;
	phdr->p_flags = PF_R \| PF_W;

	/* Update headers count*/
	md_ehdr->e_phnum = 1;
	md_ehdr->e_shnum = 4;

	return 0;
	}

	static int __init msm_minidump_init(void)
	{
	unsigned int i, size;
	struct md_region *mdr;
	struct md_smem_table *smem_table;

	/* Get Minidump table */
	smem_table = smem_get_entry(SMEM_MINIDUMP_TABLE_ID, &size, 0,
	SMEM_ANY_HOST_FLAG);
	if (IS_ERR_OR_NULL(smem_table)) {
	pr_err("SMEM is not initialized.\n");
	return -ENODEV;
	}

	if ((smem_table->next_avail_offset + MAX_MEM_LENGTH) >
	smem_table->smem_length) {
	pr_err("SMEM memory not available.\n");
	return -ENOMEM;
	}

	/* Get next_avail_offset and update it to reserve memory */
	minidump_table.region_base_offset = smem_table->next_avail_offset;
	minidump_table.region = (struct md_smem_region *)((uintptr_t)smem_table
	+ minidump_table.region_base_offset);

	smem_table->next_avail_offset =
	minidump_table.region_base_offset + MAX_MEM_LENGTH;
	minidump_table.md_smem_table = smem_table;

	msm_minidump_add_header();

	/* Add pending entries to smem table */
	spin_lock(&mdt_lock);
	minidump_enabled = true;

	for (i = 0; i < pendings; i++) {
	mdr = &minidump_table.entry[i];
	if (md_update_smem_table(mdr)) {
	pr_err("Unable to add entry %s to smem table\n",
	mdr->name);
	spin_unlock(&mdt_lock);
	return -ENOENT;
	}
	}

	pendings = 0;
	spin_unlock(&mdt_lock);

	pr_info("Enabled, region base:%d, region 0x%pK\n",
	minidump_table.region_base_offset, minidump_table.region);

	return 0;
	}
	subsys_initcall(msm_minidump_init)