From: Dave Anderson <anderson@redhat.com>
Date: Tue, 26 Nov 2013 12:42:46 -0500
Subject: [PATCH] crash-driver
Bugzilla: N/A
Upstream-status: Fedora mustard
---
arch/arm/include/asm/crash-driver.h | 6 ++
arch/arm64/include/asm/crash-driver.h | 6 ++
arch/ia64/include/asm/crash-driver.h | 90 ++++++++++++++++++++++
arch/ia64/kernel/ia64_ksyms.c | 3 +
arch/powerpc/include/asm/crash-driver.h | 6 ++
arch/s390/include/asm/crash-driver.h | 60 +++++++++++++++
arch/s390/mm/maccess.c | 2 +
arch/x86/include/asm/crash-driver.h | 6 ++
drivers/char/Kconfig | 3 +
drivers/char/Makefile | 2 +
drivers/char/crash.c | 128 ++++++++++++++++++++++++++++++++
include/asm-generic/crash-driver.h | 72 ++++++++++++++++++
12 files changed, 384 insertions(+)
create mode 100644 arch/arm/include/asm/crash-driver.h
create mode 100644 arch/arm64/include/asm/crash-driver.h
create mode 100644 arch/ia64/include/asm/crash-driver.h
create mode 100644 arch/powerpc/include/asm/crash-driver.h
create mode 100644 arch/s390/include/asm/crash-driver.h
create mode 100644 arch/x86/include/asm/crash-driver.h
create mode 100644 drivers/char/crash.c
create mode 100644 include/asm-generic/crash-driver.h
diff --git a/arch/arm/include/asm/crash-driver.h b/arch/arm/include/asm/crash-driver.h
new file mode 100644
index 000000000000..06e7ae916601
--- /dev/null
+++ b/arch/arm/include/asm/crash-driver.h
@@ -0,0 +1,6 @@
+#ifndef _ARM_CRASH_H
+#define _ARM_CRASH_H
+
+#include <asm-generic/crash-driver.h>
+
+#endif /* _ARM_CRASH_H */
diff --git a/arch/arm64/include/asm/crash-driver.h b/arch/arm64/include/asm/crash-driver.h
new file mode 100644
index 000000000000..43b26da0c5d6
--- /dev/null
+++ b/arch/arm64/include/asm/crash-driver.h
@@ -0,0 +1,6 @@
+#ifndef _ARM64_CRASH_H
+#define _ARM64_CRASH_H
+
+#include <asm-generic/crash-driver.h>
+
+#endif /* _ARM64_CRASH_H */
diff --git a/arch/ia64/include/asm/crash-driver.h b/arch/ia64/include/asm/crash-driver.h
new file mode 100644
index 000000000000..404bcb93c112
--- /dev/null
+++ b/arch/ia64/include/asm/crash-driver.h
@@ -0,0 +1,90 @@
+#ifndef _ASM_IA64_CRASH_H
+#define _ASM_IA64_CRASH_H
+
+/*
+ * linux/include/asm-ia64/crash-driver.h
+ *
+ * Copyright (c) 2004 Red Hat, Inc. 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 as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifdef __KERNEL__
+
+#include <linux/efi.h>
+#include <linux/mm.h>
+#include <asm/mmzone.h>
+
+static inline void *
+map_virtual(u64 offset, struct page **pp)
+{
+ struct page *page;
+ unsigned long pfn;
+ u32 type;
+
+ if (REGION_NUMBER(offset) == 5) {
+ char byte;
+
+ if (__get_user(byte, (char *)offset) == 0)
+ return (void *)offset;
+ else
+ return NULL;
+ }
+
+ switch (type = efi_mem_type(offset))
+ {
+ case EFI_LOADER_CODE:
+ case EFI_LOADER_DATA:
+ case EFI_BOOT_SERVICES_CODE:
+ case EFI_BOOT_SERVICES_DATA:
+ case EFI_CONVENTIONAL_MEMORY:
+ break;
+
+ default:
+ printk(KERN_INFO
+ "crash memory driver: invalid memory type for %lx: %d\n",
+ offset, type);
+ return NULL;
+ }
+
+ pfn = offset >> PAGE_SHIFT;
+
+ if (!pfn_valid(pfn)) {
+ printk(KERN_INFO
+ "crash memory driver: invalid pfn: %lx )\n", pfn);
+ return NULL;
+ }
+
+ page = pfn_to_page(pfn);
+
+ if (!page->virtual) {
+ printk(KERN_INFO
+ "crash memory driver: offset: %lx page: %lx page->virtual: NULL\n",
+ offset, (unsigned long)page);
+ return NULL;
+ }
+
+ return (page->virtual + (offset & (PAGE_SIZE-1)));
+}
+
+static inline void unmap_virtual(struct page *page)
+{
+ return;
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_IA64_CRASH_H */
diff --git a/arch/ia64/kernel/ia64_ksyms.c b/arch/ia64/kernel/ia64_ksyms.c
index 5b7791dd3965..aee4b870c763 100644
--- a/arch/ia64/kernel/ia64_ksyms.c
+++ b/arch/ia64/kernel/ia64_ksyms.c
@@ -84,6 +84,9 @@ EXPORT_SYMBOL(ia64_save_scratch_fpregs);
#include <asm/unwind.h>
EXPORT_SYMBOL(unw_init_running);
+#include <linux/efi.h>
+EXPORT_SYMBOL_GPL(efi_mem_type);
+
#if defined(CONFIG_IA64_ESI) || defined(CONFIG_IA64_ESI_MODULE)
extern void esi_call_phys (void);
EXPORT_SYMBOL_GPL(esi_call_phys);
diff --git a/arch/powerpc/include/asm/crash-driver.h b/arch/powerpc/include/asm/crash-driver.h
new file mode 100644
index 000000000000..50092d965dc5
--- /dev/null
+++ b/arch/powerpc/include/asm/crash-driver.h
@@ -0,0 +1,6 @@
+#ifndef _PPC64_CRASH_H
+#define _PPC64_CRASH_H
+
+#include <asm-generic/crash-driver.h>
+
+#endif /* _PPC64_CRASH_H */
diff --git a/arch/s390/include/asm/crash-driver.h b/arch/s390/include/asm/crash-driver.h
new file mode 100644
index 000000000000..552be5e2c571
--- /dev/null
+++ b/arch/s390/include/asm/crash-driver.h
@@ -0,0 +1,60 @@
+#ifndef _S390_CRASH_H
+#define _S390_CRASH_H
+
+#ifdef __KERNEL__
+
+#include <linux/mm.h>
+#include <linux/highmem.h>
+
+/*
+ * For swapped prefix pages get bounce buffer using xlate_dev_mem_ptr()
+ */
+static inline void *map_virtual(u64 offset, struct page **pp)
+{
+ struct page *page;
+ unsigned long pfn;
+ void *vaddr;
+
+ vaddr = xlate_dev_mem_ptr(offset);
+ pfn = ((unsigned long) vaddr) >> PAGE_SHIFT;
+ if ((unsigned long) vaddr != offset)
+ page = pfn_to_page(pfn);
+ else
+ page = NULL;
+
+ if (!page_is_ram(pfn)) {
+ printk(KERN_INFO
+ "crash memory driver: !page_is_ram(pfn: %lx)\n", pfn);
+ return NULL;
+ }
+
+ if (!pfn_valid(pfn)) {
+ printk(KERN_INFO
+ "crash memory driver: invalid pfn: %lx )\n", pfn);
+ return NULL;
+ }
+
+ *pp = page;
+ return vaddr;
+}
+
+/*
+ * Free bounce buffer if necessary
+ */
+static inline void unmap_virtual(struct page *page)
+{
+ void *vaddr;
+
+ if (page) {
+ /*
+ * Because for bounce buffers vaddr will never be 0
+ * unxlate_dev_mem_ptr() will always free the bounce buffer.
+ */
+ vaddr = (void *)(page_to_pfn(page) << PAGE_SHIFT);
+ unxlate_dev_mem_ptr(0, vaddr);
+ }
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* _S390_CRASH_H */
diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c
index 2a2e35416d2f..a529181429bb 100644
--- a/arch/s390/mm/maccess.c
+++ b/arch/s390/mm/maccess.c
@@ -193,6 +193,7 @@ void *xlate_dev_mem_ptr(unsigned long addr)
put_online_cpus();
return bounce;
}
+EXPORT_SYMBOL_GPL(xlate_dev_mem_ptr);
/*
* Free converted buffer for /dev/mem access (if necessary)
@@ -202,3 +203,4 @@ void unxlate_dev_mem_ptr(unsigned long addr, void *buf)
if ((void *) addr != buf)
free_page((unsigned long) buf);
}
+EXPORT_SYMBOL_GPL(unxlate_dev_mem_ptr);
diff --git a/arch/x86/include/asm/crash-driver.h b/arch/x86/include/asm/crash-driver.h
new file mode 100644
index 000000000000..fd4736ec99f5
--- /dev/null
+++ b/arch/x86/include/asm/crash-driver.h
@@ -0,0 +1,6 @@
+#ifndef _X86_CRASH_H
+#define _X86_CRASH_H
+
+#include <asm-generic/crash-driver.h>
+
+#endif /* _X86_CRASH_H */
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 6e9f74a5c095..ee6bae16b04c 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -4,6 +4,9 @@
menu "Character devices"
+config CRASH
+ tristate "Crash Utility memory driver"
+
source "drivers/tty/Kconfig"
config DEVKMEM
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index a324f9303e36..33ce2fb1d0a3 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -61,3 +61,5 @@ obj-$(CONFIG_JS_RTC) += js-rtc.o
js-rtc-y = rtc.o
obj-$(CONFIG_TILE_SROM) += tile-srom.o
+
+obj-$(CONFIG_CRASH) += crash.o
diff --git a/drivers/char/crash.c b/drivers/char/crash.c
new file mode 100644
index 000000000000..085378a1d539
--- /dev/null
+++ b/drivers/char/crash.c
@@ -0,0 +1,128 @@
+/*
+ * linux/drivers/char/crash.c
+ *
+ * Copyright (C) 2004 Dave Anderson <anderson@redhat.com>
+ * Copyright (C) 2004 Red Hat, Inc.
+ */
+
+/******************************************************************************
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/init.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/types.h>
+#include <asm/crash-driver.h>
+
+#define CRASH_VERSION "1.0"
+
+/*
+ * These are the file operation functions that allow crash utility
+ * access to physical memory.
+ */
+
+static loff_t
+crash_llseek(struct file * file, loff_t offset, int orig)
+{
+ switch (orig) {
+ case 0:
+ file->f_pos = offset;
+ return file->f_pos;
+ case 1:
+ file->f_pos += offset;
+ return file->f_pos;
+ default:
+ return -EINVAL;
+ }
+}
+
+/*
+ * Determine the page address for an address offset value,
+ * get a virtual address for it, and copy it out.
+ * Accesses must fit within a page.
+ */
+static ssize_t
+crash_read(struct file *file, char *buf, size_t count, loff_t *poff)
+{
+ void *vaddr;
+ struct page *page;
+ u64 offset;
+ ssize_t read;
+
+ offset = *poff;
+ if (offset >> PAGE_SHIFT != (offset+count-1) >> PAGE_SHIFT)
+ return -EINVAL;
+
+ vaddr = map_virtual(offset, &page);
+ if (!vaddr)
+ return -EFAULT;
+
+ if (copy_to_user(buf, vaddr, count)) {
+ unmap_virtual(page);
+ return -EFAULT;
+ }
+ unmap_virtual(page);
+
+ read = count;
+ *poff += read;
+ return read;
+}
+
+static struct file_operations crash_fops = {
+ .owner = THIS_MODULE,
+ .llseek = crash_llseek,
+ .read = crash_read,
+};
+
+static struct miscdevice crash_dev = {
+ MISC_DYNAMIC_MINOR,
+ "crash",
+ &crash_fops
+};
+
+static int __init
+crash_init(void)
+{
+ int ret;
+
+ ret = misc_register(&crash_dev);
+ if (ret) {
+ printk(KERN_ERR
+ "crash memory driver: cannot misc_register (MISC_DYNAMIC_MINOR)\n");
+ goto out;
+ }
+
+ ret = 0;
+ printk(KERN_INFO "crash memory driver: version %s\n", CRASH_VERSION);
+out:
+ return ret;
+}
+
+static void __exit
+crash_cleanup_module(void)
+{
+ misc_deregister(&crash_dev);
+}
+
+module_init(crash_init);
+module_exit(crash_cleanup_module);
+
+MODULE_LICENSE("GPL");
diff --git a/include/asm-generic/crash-driver.h b/include/asm-generic/crash-driver.h
new file mode 100644
index 000000000000..25ab9869d566
--- /dev/null
+++ b/include/asm-generic/crash-driver.h
@@ -0,0 +1,72 @@
+#ifndef __CRASH_H__
+#define __CRASH_H__
+
+/*
+ * include/linux/crash-driver.h
+ *
+ * Copyright (c) 2013 Red Hat, Inc. 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 as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifdef __KERNEL__
+
+#include <linux/mm.h>
+#include <linux/highmem.h>
+
+static inline void *
+map_virtual(u64 offset, struct page **pp)
+{
+ struct page *page;
+ unsigned long pfn;
+ void *vaddr;
+
+ pfn = (unsigned long)(offset >> PAGE_SHIFT);
+
+ if (!page_is_ram(pfn)) {
+ printk(KERN_INFO
+ "crash memory driver: !page_is_ram(pfn: %lx)\n", pfn);
+ return NULL;
+ }
+
+ if (!pfn_valid(pfn)) {
+ printk(KERN_INFO
+ "crash memory driver: invalid pfn: %lx )\n", pfn);
+ return NULL;
+ }
+
+ page = pfn_to_page(pfn);
+
+ vaddr = kmap(page);
+ if (!vaddr) {
+ printk(KERN_INFO
+ "crash memory driver: pfn: %lx kmap(page: %lx) failed\n",
+ pfn, (unsigned long)page);
+ return NULL;
+ }
+
+ *pp = page;
+ return (vaddr + (offset & (PAGE_SIZE-1)));
+}
+
+static inline void unmap_virtual(struct page *page)
+{
+ kunmap(page);
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* __CRASH_H__ */
--
2.1.0