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kernel/kexec.c
42.8 KB
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/* * kexec.c - kexec system call * Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com> * * This source code is licensed under the GNU General Public License, * Version 2. See the file COPYING for more details. */ |
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#include <linux/capability.h> |
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#include <linux/mm.h> #include <linux/file.h> #include <linux/slab.h> #include <linux/fs.h> #include <linux/kexec.h> |
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#include <linux/mutex.h> |
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#include <linux/list.h> #include <linux/highmem.h> #include <linux/syscalls.h> #include <linux/reboot.h> |
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#include <linux/ioport.h> |
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#include <linux/hardirq.h> |
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#include <linux/elf.h> #include <linux/elfcore.h> |
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#include <linux/utsname.h> #include <linux/numa.h> |
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#include <linux/suspend.h> #include <linux/device.h> |
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#include <linux/freezer.h> #include <linux/pm.h> #include <linux/cpu.h> #include <linux/console.h> |
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#include <linux/vmalloc.h> |
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#include <linux/swap.h> |
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#include <linux/syscore_ops.h> |
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#include <linux/compiler.h> |
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#include <linux/hugetlb.h> |
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|
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#include <asm/page.h> #include <asm/uaccess.h> #include <asm/io.h> |
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#include <asm/sections.h> |
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|
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/* Per cpu memory for storing cpu states in case of system crash. */ |
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note_buf_t __percpu *crash_notes; |
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|
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/* vmcoreinfo stuff */ |
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static unsigned char vmcoreinfo_data[VMCOREINFO_BYTES]; |
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u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4]; |
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size_t vmcoreinfo_size; size_t vmcoreinfo_max_size = sizeof(vmcoreinfo_data); |
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|
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/* Flag to indicate we are going to kexec a new kernel */ bool kexec_in_progress = false; |
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/* Location of the reserved area for the crash kernel */ struct resource crashk_res = { .name = "Crash kernel", .start = 0, .end = 0, .flags = IORESOURCE_BUSY | IORESOURCE_MEM }; |
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struct resource crashk_low_res = { |
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.name = "Crash kernel", |
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.start = 0, .end = 0, .flags = IORESOURCE_BUSY | IORESOURCE_MEM }; |
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|
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int kexec_should_crash(struct task_struct *p) { |
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if (in_interrupt() || !p->pid || is_global_init(p) || panic_on_oops) |
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return 1; return 0; } |
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/* * When kexec transitions to the new kernel there is a one-to-one * mapping between physical and virtual addresses. On processors * where you can disable the MMU this is trivial, and easy. For * others it is still a simple predictable page table to setup. * * In that environment kexec copies the new kernel to its final * resting place. This means I can only support memory whose * physical address can fit in an unsigned long. In particular * addresses where (pfn << PAGE_SHIFT) > ULONG_MAX cannot be handled. * If the assembly stub has more restrictive requirements * KEXEC_SOURCE_MEMORY_LIMIT and KEXEC_DEST_MEMORY_LIMIT can be * defined more restrictively in <asm/kexec.h>. * * The code for the transition from the current kernel to the * the new kernel is placed in the control_code_buffer, whose size |
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* is given by KEXEC_CONTROL_PAGE_SIZE. In the best case only a single |
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* page of memory is necessary, but some architectures require more. * Because this memory must be identity mapped in the transition from * virtual to physical addresses it must live in the range * 0 - TASK_SIZE, as only the user space mappings are arbitrarily * modifiable. * * The assembly stub in the control code buffer is passed a linked list * of descriptor pages detailing the source pages of the new kernel, * and the destination addresses of those source pages. As this data * structure is not used in the context of the current OS, it must * be self-contained. * * The code has been made to work with highmem pages and will use a * destination page in its final resting place (if it happens * to allocate it). The end product of this is that most of the * physical address space, and most of RAM can be used. * * Future directions include: * - allocating a page table with the control code buffer identity * mapped, to simplify machine_kexec and make kexec_on_panic more * reliable. */ /* * KIMAGE_NO_DEST is an impossible destination address..., for * allocating pages whose destination address we do not care about. */ #define KIMAGE_NO_DEST (-1UL) |
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static int kimage_is_destination_range(struct kimage *image, unsigned long start, unsigned long end); static struct page *kimage_alloc_page(struct kimage *image, |
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gfp_t gfp_mask, |
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unsigned long dest); |
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static int do_kimage_alloc(struct kimage **rimage, unsigned long entry, |
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unsigned long nr_segments, struct kexec_segment __user *segments) |
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{ size_t segment_bytes; struct kimage *image; unsigned long i; int result; /* Allocate a controlling structure */ result = -ENOMEM; |
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image = kzalloc(sizeof(*image), GFP_KERNEL); |
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if (!image) |
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goto out; |
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|
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image->head = 0; image->entry = &image->head; image->last_entry = &image->head; image->control_page = ~0; /* By default this does not apply */ image->start = entry; image->type = KEXEC_TYPE_DEFAULT; /* Initialize the list of control pages */ INIT_LIST_HEAD(&image->control_pages); /* Initialize the list of destination pages */ INIT_LIST_HEAD(&image->dest_pages); |
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/* Initialize the list of unusable pages */ |
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INIT_LIST_HEAD(&image->unuseable_pages); /* Read in the segments */ image->nr_segments = nr_segments; segment_bytes = nr_segments * sizeof(*segments); result = copy_from_user(image->segment, segments, segment_bytes); |
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if (result) { result = -EFAULT; |
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goto out; |
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} |
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/* * Verify we have good destination addresses. The caller is * responsible for making certain we don't attempt to load * the new image into invalid or reserved areas of RAM. This * just verifies it is an address we can use. * * Since the kernel does everything in page size chunks ensure |
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* the destination addresses are page aligned. Too many |
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* special cases crop of when we don't do this. The most * insidious is getting overlapping destination addresses * simply because addresses are changed to page size * granularity. */ result = -EADDRNOTAVAIL; for (i = 0; i < nr_segments; i++) { unsigned long mstart, mend; |
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|
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mstart = image->segment[i].mem; mend = mstart + image->segment[i].memsz; if ((mstart & ~PAGE_MASK) || (mend & ~PAGE_MASK)) goto out; if (mend >= KEXEC_DESTINATION_MEMORY_LIMIT) goto out; } /* Verify our destination addresses do not overlap. * If we alloed overlapping destination addresses * through very weird things can happen with no * easy explanation as one segment stops on another. */ result = -EINVAL; |
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for (i = 0; i < nr_segments; i++) { |
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unsigned long mstart, mend; unsigned long j; |
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|
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mstart = image->segment[i].mem; mend = mstart + image->segment[i].memsz; |
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for (j = 0; j < i; j++) { |
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unsigned long pstart, pend; pstart = image->segment[j].mem; pend = pstart + image->segment[j].memsz; /* Do the segments overlap ? */ if ((mend > pstart) && (mstart < pend)) goto out; } } /* Ensure our buffer sizes are strictly less than * our memory sizes. This should always be the case, * and it is easier to check up front than to be surprised * later on. */ result = -EINVAL; |
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for (i = 0; i < nr_segments; i++) { |
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if (image->segment[i].bufsz > image->segment[i].memsz) goto out; } |
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result = 0; |
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out: if (result == 0) |
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*rimage = image; |
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else |
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kfree(image); |
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|
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return result; } |
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static void kimage_free_page_list(struct list_head *list); |
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static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry, |
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unsigned long nr_segments, struct kexec_segment __user *segments) |
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{ int result; struct kimage *image; /* Allocate and initialize a controlling structure */ image = NULL; result = do_kimage_alloc(&image, entry, nr_segments, segments); |
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if (result) |
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goto out; |
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|
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/* * Find a location for the control code buffer, and add it * the vector of segments so that it's pages will also be * counted as destination pages. */ result = -ENOMEM; image->control_code_page = kimage_alloc_control_pages(image, |
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get_order(KEXEC_CONTROL_PAGE_SIZE)); |
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if (!image->control_code_page) { |
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pr_err("Could not allocate control_code_buffer "); |
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goto out_free; |
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} |
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image->swap_page = kimage_alloc_control_pages(image, 0); if (!image->swap_page) { |
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pr_err("Could not allocate swap buffer "); |
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goto out_free; |
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} |
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*rimage = image; return 0; |
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|
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out_free: kimage_free_page_list(&image->control_pages); kfree(image); out: |
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return result; } static int kimage_crash_alloc(struct kimage **rimage, unsigned long entry, |
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unsigned long nr_segments, |
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struct kexec_segment __user *segments) |
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{ int result; struct kimage *image; unsigned long i; image = NULL; /* Verify we have a valid entry point */ if ((entry < crashk_res.start) || (entry > crashk_res.end)) { result = -EADDRNOTAVAIL; goto out; } /* Allocate and initialize a controlling structure */ result = do_kimage_alloc(&image, entry, nr_segments, segments); |
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if (result) |
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goto out; |
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/* Enable the special crash kernel control page * allocation policy. */ image->control_page = crashk_res.start; image->type = KEXEC_TYPE_CRASH; /* * Verify we have good destination addresses. Normally * the caller is responsible for making certain we don't * attempt to load the new image into invalid or reserved * areas of RAM. But crash kernels are preloaded into a * reserved area of ram. We must ensure the addresses * are in the reserved area otherwise preloading the * kernel could corrupt things. */ result = -EADDRNOTAVAIL; for (i = 0; i < nr_segments; i++) { unsigned long mstart, mend; |
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|
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mstart = image->segment[i].mem; |
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mend = mstart + image->segment[i].memsz - 1; |
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/* Ensure we are within the crash kernel limits */ if ((mstart < crashk_res.start) || (mend > crashk_res.end)) |
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goto out_free; |
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} |
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/* * Find a location for the control code buffer, and add * the vector of segments so that it's pages will also be * counted as destination pages. */ result = -ENOMEM; image->control_code_page = kimage_alloc_control_pages(image, |
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get_order(KEXEC_CONTROL_PAGE_SIZE)); |
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if (!image->control_code_page) { |
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pr_err("Could not allocate control_code_buffer "); |
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goto out_free; |
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} |
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*rimage = image; return 0; |
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|
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out_free: kfree(image); out: |
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return result; } |
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static int kimage_is_destination_range(struct kimage *image, unsigned long start, unsigned long end) |
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{ unsigned long i; for (i = 0; i < image->nr_segments; i++) { unsigned long mstart, mend; |
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|
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mstart = image->segment[i].mem; |
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mend = mstart + image->segment[i].memsz; if ((end > mstart) && (start < mend)) |
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return 1; |
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} |
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|
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return 0; } |
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static struct page *kimage_alloc_pages(gfp_t gfp_mask, unsigned int order) |
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{ struct page *pages; |
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|
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pages = alloc_pages(gfp_mask, order); if (pages) { unsigned int count, i; pages->mapping = NULL; |
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set_page_private(pages, order); |
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count = 1 << order; |
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for (i = 0; i < count; i++) |
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SetPageReserved(pages + i); |
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} |
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return pages; } static void kimage_free_pages(struct page *page) { unsigned int order, count, i; |
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|
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order = page_private(page); |
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count = 1 << order; |
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for (i = 0; i < count; i++) |
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ClearPageReserved(page + i); |
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__free_pages(page, order); } static void kimage_free_page_list(struct list_head *list) { struct list_head *pos, *next; |
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|
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list_for_each_safe(pos, next, list) { struct page *page; page = list_entry(pos, struct page, lru); list_del(&page->lru); |
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kimage_free_pages(page); } } |
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static struct page *kimage_alloc_normal_control_pages(struct kimage *image, unsigned int order) |
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{ /* Control pages are special, they are the intermediaries * that are needed while we copy the rest of the pages * to their final resting place. As such they must * not conflict with either the destination addresses * or memory the kernel is already using. * * The only case where we really need more than one of * these are for architectures where we cannot disable * the MMU and must instead generate an identity mapped * page table for all of the memory. * * At worst this runs in O(N) of the image size. */ struct list_head extra_pages; struct page *pages; unsigned int count; count = 1 << order; INIT_LIST_HEAD(&extra_pages); /* Loop while I can allocate a page and the page allocated * is a destination page. */ do { unsigned long pfn, epfn, addr, eaddr; |
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|
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pages = kimage_alloc_pages(GFP_KERNEL, order); if (!pages) break; pfn = page_to_pfn(pages); epfn = pfn + count; addr = pfn << PAGE_SHIFT; eaddr = epfn << PAGE_SHIFT; if ((epfn >= (KEXEC_CONTROL_MEMORY_LIMIT >> PAGE_SHIFT)) || |
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kimage_is_destination_range(image, addr, eaddr)) { |
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list_add(&pages->lru, &extra_pages); pages = NULL; } |
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} while (!pages); |
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if (pages) { /* Remember the allocated page... */ list_add(&pages->lru, &image->control_pages); /* Because the page is already in it's destination * location we will never allocate another page at * that address. Therefore kimage_alloc_pages * will not return it (again) and we don't need * to give it an entry in image->segment[]. */ } /* Deal with the destination pages I have inadvertently allocated. * * Ideally I would convert multi-page allocations into single |
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* page allocations, and add everything to image->dest_pages. |
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* * For now it is simpler to just free the pages. */ kimage_free_page_list(&extra_pages); |
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|
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return pages; |
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} |
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static struct page *kimage_alloc_crash_control_pages(struct kimage *image, unsigned int order) |
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{ /* Control pages are special, they are the intermediaries * that are needed while we copy the rest of the pages * to their final resting place. As such they must * not conflict with either the destination addresses * or memory the kernel is already using. * * Control pages are also the only pags we must allocate * when loading a crash kernel. All of the other pages * are specified by the segments and we just memcpy * into them directly. * * The only case where we really need more than one of * these are for architectures where we cannot disable * the MMU and must instead generate an identity mapped * page table for all of the memory. * * Given the low demand this implements a very simple * allocator that finds the first hole of the appropriate * size in the reserved memory region, and allocates all * of the memory up to and including the hole. */ unsigned long hole_start, hole_end, size; struct page *pages; |
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|
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pages = NULL; size = (1 << order) << PAGE_SHIFT; hole_start = (image->control_page + (size - 1)) & ~(size - 1); hole_end = hole_start + size - 1; |
72414d3f1 [PATCH] kexec cod... |
491 |
while (hole_end <= crashk_res.end) { |
dc009d924 [PATCH] kexec: ad... |
492 |
unsigned long i; |
72414d3f1 [PATCH] kexec cod... |
493 |
|
3d214faea [S390] kdump: Add... |
494 |
if (hole_end > KEXEC_CRASH_CONTROL_MEMORY_LIMIT) |
dc009d924 [PATCH] kexec: ad... |
495 |
break; |
dc009d924 [PATCH] kexec: ad... |
496 |
/* See if I overlap any of the segments */ |
72414d3f1 [PATCH] kexec cod... |
497 |
for (i = 0; i < image->nr_segments; i++) { |
dc009d924 [PATCH] kexec: ad... |
498 |
unsigned long mstart, mend; |
72414d3f1 [PATCH] kexec cod... |
499 |
|
dc009d924 [PATCH] kexec: ad... |
500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 |
mstart = image->segment[i].mem; mend = mstart + image->segment[i].memsz - 1; if ((hole_end >= mstart) && (hole_start <= mend)) { /* Advance the hole to the end of the segment */ hole_start = (mend + (size - 1)) & ~(size - 1); hole_end = hole_start + size - 1; break; } } /* If I don't overlap any segments I have found my hole! */ if (i == image->nr_segments) { pages = pfn_to_page(hole_start >> PAGE_SHIFT); break; } } |
72414d3f1 [PATCH] kexec cod... |
515 |
if (pages) |
dc009d924 [PATCH] kexec: ad... |
516 |
image->control_page = hole_end; |
72414d3f1 [PATCH] kexec cod... |
517 |
|
dc009d924 [PATCH] kexec: ad... |
518 519 |
return pages; } |
72414d3f1 [PATCH] kexec cod... |
520 521 |
struct page *kimage_alloc_control_pages(struct kimage *image, unsigned int order) |
dc009d924 [PATCH] kexec: ad... |
522 523 |
{ struct page *pages = NULL; |
72414d3f1 [PATCH] kexec cod... |
524 525 |
switch (image->type) { |
dc009d924 [PATCH] kexec: ad... |
526 527 528 529 530 531 532 |
case KEXEC_TYPE_DEFAULT: pages = kimage_alloc_normal_control_pages(image, order); break; case KEXEC_TYPE_CRASH: pages = kimage_alloc_crash_control_pages(image, order); break; } |
72414d3f1 [PATCH] kexec cod... |
533 |
|
dc009d924 [PATCH] kexec: ad... |
534 535 536 537 538 |
return pages; } static int kimage_add_entry(struct kimage *image, kimage_entry_t entry) { |
72414d3f1 [PATCH] kexec cod... |
539 |
if (*image->entry != 0) |
dc009d924 [PATCH] kexec: ad... |
540 |
image->entry++; |
72414d3f1 [PATCH] kexec cod... |
541 |
|
dc009d924 [PATCH] kexec: ad... |
542 543 544 |
if (image->entry == image->last_entry) { kimage_entry_t *ind_page; struct page *page; |
72414d3f1 [PATCH] kexec cod... |
545 |
|
dc009d924 [PATCH] kexec: ad... |
546 |
page = kimage_alloc_page(image, GFP_KERNEL, KIMAGE_NO_DEST); |
72414d3f1 [PATCH] kexec cod... |
547 |
if (!page) |
dc009d924 [PATCH] kexec: ad... |
548 |
return -ENOMEM; |
72414d3f1 [PATCH] kexec cod... |
549 |
|
dc009d924 [PATCH] kexec: ad... |
550 551 552 |
ind_page = page_address(page); *image->entry = virt_to_phys(ind_page) | IND_INDIRECTION; image->entry = ind_page; |
72414d3f1 [PATCH] kexec cod... |
553 554 |
image->last_entry = ind_page + ((PAGE_SIZE/sizeof(kimage_entry_t)) - 1); |
dc009d924 [PATCH] kexec: ad... |
555 556 557 558 |
} *image->entry = entry; image->entry++; *image->entry = 0; |
72414d3f1 [PATCH] kexec cod... |
559 |
|
dc009d924 [PATCH] kexec: ad... |
560 561 |
return 0; } |
72414d3f1 [PATCH] kexec cod... |
562 563 |
static int kimage_set_destination(struct kimage *image, unsigned long destination) |
dc009d924 [PATCH] kexec: ad... |
564 565 566 567 568 |
{ int result; destination &= PAGE_MASK; result = kimage_add_entry(image, destination | IND_DESTINATION); |
72414d3f1 [PATCH] kexec cod... |
569 |
if (result == 0) |
dc009d924 [PATCH] kexec: ad... |
570 |
image->destination = destination; |
72414d3f1 [PATCH] kexec cod... |
571 |
|
dc009d924 [PATCH] kexec: ad... |
572 573 574 575 576 577 578 579 580 581 |
return result; } static int kimage_add_page(struct kimage *image, unsigned long page) { int result; page &= PAGE_MASK; result = kimage_add_entry(image, page | IND_SOURCE); |
72414d3f1 [PATCH] kexec cod... |
582 |
if (result == 0) |
dc009d924 [PATCH] kexec: ad... |
583 |
image->destination += PAGE_SIZE; |
72414d3f1 [PATCH] kexec cod... |
584 |
|
dc009d924 [PATCH] kexec: ad... |
585 586 587 588 589 590 591 592 |
return result; } static void kimage_free_extra_pages(struct kimage *image) { /* Walk through and free any extra destination pages I may have */ kimage_free_page_list(&image->dest_pages); |
25985edce Fix common misspe... |
593 |
/* Walk through and free any unusable pages I have cached */ |
dc009d924 [PATCH] kexec: ad... |
594 595 596 |
kimage_free_page_list(&image->unuseable_pages); } |
7fccf0326 kernel/kexec.c: m... |
597 |
static void kimage_terminate(struct kimage *image) |
dc009d924 [PATCH] kexec: ad... |
598 |
{ |
72414d3f1 [PATCH] kexec cod... |
599 |
if (*image->entry != 0) |
dc009d924 [PATCH] kexec: ad... |
600 |
image->entry++; |
72414d3f1 [PATCH] kexec cod... |
601 |
|
dc009d924 [PATCH] kexec: ad... |
602 |
*image->entry = IND_DONE; |
dc009d924 [PATCH] kexec: ad... |
603 604 605 606 |
} #define for_each_kimage_entry(image, ptr, entry) \ for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); \ |
e1bebcf41 kernel/kexec.c: c... |
607 608 |
ptr = (entry & IND_INDIRECTION) ? \ phys_to_virt((entry & PAGE_MASK)) : ptr + 1) |
dc009d924 [PATCH] kexec: ad... |
609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 |
static void kimage_free_entry(kimage_entry_t entry) { struct page *page; page = pfn_to_page(entry >> PAGE_SHIFT); kimage_free_pages(page); } static void kimage_free(struct kimage *image) { kimage_entry_t *ptr, entry; kimage_entry_t ind = 0; if (!image) return; |
72414d3f1 [PATCH] kexec cod... |
625 |
|
dc009d924 [PATCH] kexec: ad... |
626 627 628 629 |
kimage_free_extra_pages(image); for_each_kimage_entry(image, ptr, entry) { if (entry & IND_INDIRECTION) { /* Free the previous indirection page */ |
72414d3f1 [PATCH] kexec cod... |
630 |
if (ind & IND_INDIRECTION) |
dc009d924 [PATCH] kexec: ad... |
631 |
kimage_free_entry(ind); |
dc009d924 [PATCH] kexec: ad... |
632 633 634 635 |
/* Save this indirection page until we are * done with it. */ ind = entry; |
e1bebcf41 kernel/kexec.c: c... |
636 |
} else if (entry & IND_SOURCE) |
dc009d924 [PATCH] kexec: ad... |
637 |
kimage_free_entry(entry); |
dc009d924 [PATCH] kexec: ad... |
638 639 |
} /* Free the final indirection page */ |
72414d3f1 [PATCH] kexec cod... |
640 |
if (ind & IND_INDIRECTION) |
dc009d924 [PATCH] kexec: ad... |
641 |
kimage_free_entry(ind); |
dc009d924 [PATCH] kexec: ad... |
642 643 644 645 646 647 648 649 |
/* Handle any machine specific cleanup */ machine_kexec_cleanup(image); /* Free the kexec control pages... */ kimage_free_page_list(&image->control_pages); kfree(image); } |
72414d3f1 [PATCH] kexec cod... |
650 651 |
static kimage_entry_t *kimage_dst_used(struct kimage *image, unsigned long page) |
dc009d924 [PATCH] kexec: ad... |
652 653 654 655 656 |
{ kimage_entry_t *ptr, entry; unsigned long destination = 0; for_each_kimage_entry(image, ptr, entry) { |
72414d3f1 [PATCH] kexec cod... |
657 |
if (entry & IND_DESTINATION) |
dc009d924 [PATCH] kexec: ad... |
658 |
destination = entry & PAGE_MASK; |
dc009d924 [PATCH] kexec: ad... |
659 |
else if (entry & IND_SOURCE) { |
72414d3f1 [PATCH] kexec cod... |
660 |
if (page == destination) |
dc009d924 [PATCH] kexec: ad... |
661 |
return ptr; |
dc009d924 [PATCH] kexec: ad... |
662 663 664 |
destination += PAGE_SIZE; } } |
72414d3f1 [PATCH] kexec cod... |
665 |
|
314b6a4d8 [PATCH] kexec: fi... |
666 |
return NULL; |
dc009d924 [PATCH] kexec: ad... |
667 |
} |
72414d3f1 [PATCH] kexec cod... |
668 |
static struct page *kimage_alloc_page(struct kimage *image, |
9796fdd82 [PATCH] gfp_t: ke... |
669 |
gfp_t gfp_mask, |
72414d3f1 [PATCH] kexec cod... |
670 |
unsigned long destination) |
dc009d924 [PATCH] kexec: ad... |
671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 |
{ /* * Here we implement safeguards to ensure that a source page * is not copied to its destination page before the data on * the destination page is no longer useful. * * To do this we maintain the invariant that a source page is * either its own destination page, or it is not a * destination page at all. * * That is slightly stronger than required, but the proof * that no problems will not occur is trivial, and the * implementation is simply to verify. * * When allocating all pages normally this algorithm will run * in O(N) time, but in the worst case it will run in O(N^2) * time. If the runtime is a problem the data structures can * be fixed. */ struct page *page; unsigned long addr; /* * Walk through the list of destination pages, and see if I * have a match. */ list_for_each_entry(page, &image->dest_pages, lru) { addr = page_to_pfn(page) << PAGE_SHIFT; if (addr == destination) { list_del(&page->lru); return page; } } page = NULL; while (1) { kimage_entry_t *old; /* Allocate a page, if we run out of memory give up */ page = kimage_alloc_pages(gfp_mask, 0); |
72414d3f1 [PATCH] kexec cod... |
710 |
if (!page) |
314b6a4d8 [PATCH] kexec: fi... |
711 |
return NULL; |
dc009d924 [PATCH] kexec: ad... |
712 |
/* If the page cannot be used file it away */ |
72414d3f1 [PATCH] kexec cod... |
713 714 |
if (page_to_pfn(page) > (KEXEC_SOURCE_MEMORY_LIMIT >> PAGE_SHIFT)) { |
dc009d924 [PATCH] kexec: ad... |
715 716 717 718 719 720 721 722 723 724 |
list_add(&page->lru, &image->unuseable_pages); continue; } addr = page_to_pfn(page) << PAGE_SHIFT; /* If it is the destination page we want use it */ if (addr == destination) break; /* If the page is not a destination page use it */ |
72414d3f1 [PATCH] kexec cod... |
725 726 |
if (!kimage_is_destination_range(image, addr, addr + PAGE_SIZE)) |
dc009d924 [PATCH] kexec: ad... |
727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 |
break; /* * I know that the page is someones destination page. * See if there is already a source page for this * destination page. And if so swap the source pages. */ old = kimage_dst_used(image, addr); if (old) { /* If so move it */ unsigned long old_addr; struct page *old_page; old_addr = *old & PAGE_MASK; old_page = pfn_to_page(old_addr >> PAGE_SHIFT); copy_highpage(page, old_page); *old = addr | (*old & ~PAGE_MASK); /* The old page I have found cannot be a |
f9092f358 kexec: fix segmen... |
746 747 |
* destination page, so return it if it's * gfp_flags honor the ones passed in. |
dc009d924 [PATCH] kexec: ad... |
748 |
*/ |
f9092f358 kexec: fix segmen... |
749 750 751 752 753 |
if (!(gfp_mask & __GFP_HIGHMEM) && PageHighMem(old_page)) { kimage_free_pages(old_page); continue; } |
dc009d924 [PATCH] kexec: ad... |
754 755 756 |
addr = old_addr; page = old_page; break; |
e1bebcf41 kernel/kexec.c: c... |
757 |
} else { |
dc009d924 [PATCH] kexec: ad... |
758 759 760 761 762 763 |
/* Place the page on the destination list I * will use it later. */ list_add(&page->lru, &image->dest_pages); } } |
72414d3f1 [PATCH] kexec cod... |
764 |
|
dc009d924 [PATCH] kexec: ad... |
765 766 767 768 |
return page; } static int kimage_load_normal_segment(struct kimage *image, |
72414d3f1 [PATCH] kexec cod... |
769 |
struct kexec_segment *segment) |
dc009d924 [PATCH] kexec: ad... |
770 771 |
{ unsigned long maddr; |
310faaa9b kexec: fix wrong ... |
772 |
size_t ubytes, mbytes; |
dc009d924 [PATCH] kexec: ad... |
773 |
int result; |
314b6a4d8 [PATCH] kexec: fi... |
774 |
unsigned char __user *buf; |
dc009d924 [PATCH] kexec: ad... |
775 776 777 778 779 780 781 782 |
result = 0; buf = segment->buf; ubytes = segment->bufsz; mbytes = segment->memsz; maddr = segment->mem; result = kimage_set_destination(image, maddr); |
72414d3f1 [PATCH] kexec cod... |
783 |
if (result < 0) |
dc009d924 [PATCH] kexec: ad... |
784 |
goto out; |
72414d3f1 [PATCH] kexec cod... |
785 786 |
while (mbytes) { |
dc009d924 [PATCH] kexec: ad... |
787 788 789 |
struct page *page; char *ptr; size_t uchunk, mchunk; |
72414d3f1 [PATCH] kexec cod... |
790 |
|
dc009d924 [PATCH] kexec: ad... |
791 |
page = kimage_alloc_page(image, GFP_HIGHUSER, maddr); |
c80544dc0 sparse pointer us... |
792 |
if (!page) { |
dc009d924 [PATCH] kexec: ad... |
793 794 795 |
result = -ENOMEM; goto out; } |
72414d3f1 [PATCH] kexec cod... |
796 797 798 |
result = kimage_add_page(image, page_to_pfn(page) << PAGE_SHIFT); if (result < 0) |
dc009d924 [PATCH] kexec: ad... |
799 |
goto out; |
72414d3f1 [PATCH] kexec cod... |
800 |
|
dc009d924 [PATCH] kexec: ad... |
801 802 |
ptr = kmap(page); /* Start with a clear page */ |
3ecb01df3 use clear_page()/... |
803 |
clear_page(ptr); |
dc009d924 [PATCH] kexec: ad... |
804 |
ptr += maddr & ~PAGE_MASK; |
31c3a3fe0 kexec: Use min() ... |
805 806 807 |
mchunk = min_t(size_t, mbytes, PAGE_SIZE - (maddr & ~PAGE_MASK)); uchunk = min(ubytes, mchunk); |
72414d3f1 [PATCH] kexec cod... |
808 |
|
dc009d924 [PATCH] kexec: ad... |
809 810 811 |
result = copy_from_user(ptr, buf, uchunk); kunmap(page); if (result) { |
f65a03f6a kexec: return -EF... |
812 |
result = -EFAULT; |
dc009d924 [PATCH] kexec: ad... |
813 814 815 816 817 818 819 |
goto out; } ubytes -= uchunk; maddr += mchunk; buf += mchunk; mbytes -= mchunk; } |
72414d3f1 [PATCH] kexec cod... |
820 |
out: |
dc009d924 [PATCH] kexec: ad... |
821 822 823 824 |
return result; } static int kimage_load_crash_segment(struct kimage *image, |
72414d3f1 [PATCH] kexec cod... |
825 |
struct kexec_segment *segment) |
dc009d924 [PATCH] kexec: ad... |
826 827 828 829 830 831 |
{ /* For crash dumps kernels we simply copy the data from * user space to it's destination. * We do things a page at a time for the sake of kmap. */ unsigned long maddr; |
310faaa9b kexec: fix wrong ... |
832 |
size_t ubytes, mbytes; |
dc009d924 [PATCH] kexec: ad... |
833 |
int result; |
314b6a4d8 [PATCH] kexec: fi... |
834 |
unsigned char __user *buf; |
dc009d924 [PATCH] kexec: ad... |
835 836 837 838 839 840 |
result = 0; buf = segment->buf; ubytes = segment->bufsz; mbytes = segment->memsz; maddr = segment->mem; |
72414d3f1 [PATCH] kexec cod... |
841 |
while (mbytes) { |
dc009d924 [PATCH] kexec: ad... |
842 843 844 |
struct page *page; char *ptr; size_t uchunk, mchunk; |
72414d3f1 [PATCH] kexec cod... |
845 |
|
dc009d924 [PATCH] kexec: ad... |
846 |
page = pfn_to_page(maddr >> PAGE_SHIFT); |
c80544dc0 sparse pointer us... |
847 |
if (!page) { |
dc009d924 [PATCH] kexec: ad... |
848 849 850 851 852 |
result = -ENOMEM; goto out; } ptr = kmap(page); ptr += maddr & ~PAGE_MASK; |
31c3a3fe0 kexec: Use min() ... |
853 854 855 856 |
mchunk = min_t(size_t, mbytes, PAGE_SIZE - (maddr & ~PAGE_MASK)); uchunk = min(ubytes, mchunk); if (mchunk > uchunk) { |
dc009d924 [PATCH] kexec: ad... |
857 858 859 860 |
/* Zero the trailing part of the page */ memset(ptr + uchunk, 0, mchunk - uchunk); } result = copy_from_user(ptr, buf, uchunk); |
a79561134 [IA64] IA64 Kexec... |
861 |
kexec_flush_icache_page(page); |
dc009d924 [PATCH] kexec: ad... |
862 863 |
kunmap(page); if (result) { |
f65a03f6a kexec: return -EF... |
864 |
result = -EFAULT; |
dc009d924 [PATCH] kexec: ad... |
865 866 867 868 869 870 871 |
goto out; } ubytes -= uchunk; maddr += mchunk; buf += mchunk; mbytes -= mchunk; } |
72414d3f1 [PATCH] kexec cod... |
872 |
out: |
dc009d924 [PATCH] kexec: ad... |
873 874 875 876 |
return result; } static int kimage_load_segment(struct kimage *image, |
72414d3f1 [PATCH] kexec cod... |
877 |
struct kexec_segment *segment) |
dc009d924 [PATCH] kexec: ad... |
878 879 |
{ int result = -ENOMEM; |
72414d3f1 [PATCH] kexec cod... |
880 881 |
switch (image->type) { |
dc009d924 [PATCH] kexec: ad... |
882 883 884 885 886 887 888 |
case KEXEC_TYPE_DEFAULT: result = kimage_load_normal_segment(image, segment); break; case KEXEC_TYPE_CRASH: result = kimage_load_crash_segment(image, segment); break; } |
72414d3f1 [PATCH] kexec cod... |
889 |
|
dc009d924 [PATCH] kexec: ad... |
890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 |
return result; } /* * Exec Kernel system call: for obvious reasons only root may call it. * * This call breaks up into three pieces. * - A generic part which loads the new kernel from the current * address space, and very carefully places the data in the * allocated pages. * * - A generic part that interacts with the kernel and tells all of * the devices to shut down. Preventing on-going dmas, and placing * the devices in a consistent state so a later kernel can * reinitialize them. * * - A machine specific part that includes the syscall number |
002ace782 kexec: Typo s/the... |
907 |
* and then copies the image to it's final destination. And |
dc009d924 [PATCH] kexec: ad... |
908 909 910 911 912 |
* jumps into the image at entry. * * kexec does not sync, or unmount filesystems so if you need * that to happen you need to do that yourself. */ |
c330dda90 [PATCH] Add a sys... |
913 914 |
struct kimage *kexec_image; struct kimage *kexec_crash_image; |
7984754b9 kexec: add sysctl... |
915 |
int kexec_load_disabled; |
8c5a1cf0a kexec: use a mute... |
916 917 |
static DEFINE_MUTEX(kexec_mutex); |
dc009d924 [PATCH] kexec: ad... |
918 |
|
754fe8d29 [CVE-2009-0029] S... |
919 920 |
SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, struct kexec_segment __user *, segments, unsigned long, flags) |
dc009d924 [PATCH] kexec: ad... |
921 922 |
{ struct kimage **dest_image, *image; |
dc009d924 [PATCH] kexec: ad... |
923 924 925 |
int result; /* We only trust the superuser with rebooting the system. */ |
7984754b9 kexec: add sysctl... |
926 |
if (!capable(CAP_SYS_BOOT) || kexec_load_disabled) |
dc009d924 [PATCH] kexec: ad... |
927 928 929 930 931 932 933 934 935 936 937 938 |
return -EPERM; /* * Verify we have a legal set of flags * This leaves us room for future extensions. */ if ((flags & KEXEC_FLAGS) != (flags & ~KEXEC_ARCH_MASK)) return -EINVAL; /* Verify we are on the appropriate architecture */ if (((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH) && ((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT)) |
dc009d924 [PATCH] kexec: ad... |
939 |
return -EINVAL; |
dc009d924 [PATCH] kexec: ad... |
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 |
/* Put an artificial cap on the number * of segments passed to kexec_load. */ if (nr_segments > KEXEC_SEGMENT_MAX) return -EINVAL; image = NULL; result = 0; /* Because we write directly to the reserved memory * region when loading crash kernels we need a mutex here to * prevent multiple crash kernels from attempting to load * simultaneously, and to prevent a crash kernel from loading * over the top of a in use crash kernel. * * KISS: always take the mutex. */ |
8c5a1cf0a kexec: use a mute... |
958 |
if (!mutex_trylock(&kexec_mutex)) |
dc009d924 [PATCH] kexec: ad... |
959 |
return -EBUSY; |
72414d3f1 [PATCH] kexec cod... |
960 |
|
dc009d924 [PATCH] kexec: ad... |
961 |
dest_image = &kexec_image; |
72414d3f1 [PATCH] kexec cod... |
962 |
if (flags & KEXEC_ON_CRASH) |
dc009d924 [PATCH] kexec: ad... |
963 |
dest_image = &kexec_crash_image; |
dc009d924 [PATCH] kexec: ad... |
964 965 |
if (nr_segments > 0) { unsigned long i; |
72414d3f1 [PATCH] kexec cod... |
966 |
|
dc009d924 [PATCH] kexec: ad... |
967 |
/* Loading another kernel to reboot into */ |
72414d3f1 [PATCH] kexec cod... |
968 969 970 |
if ((flags & KEXEC_ON_CRASH) == 0) result = kimage_normal_alloc(&image, entry, nr_segments, segments); |
dc009d924 [PATCH] kexec: ad... |
971 972 973 974 975 976 |
/* Loading another kernel to switch to if this one crashes */ else if (flags & KEXEC_ON_CRASH) { /* Free any current crash dump kernel before * we corrupt it. */ kimage_free(xchg(&kexec_crash_image, NULL)); |
72414d3f1 [PATCH] kexec cod... |
977 978 |
result = kimage_crash_alloc(&image, entry, nr_segments, segments); |
558df7209 [S390] kdump: Add... |
979 |
crash_map_reserved_pages(); |
dc009d924 [PATCH] kexec: ad... |
980 |
} |
72414d3f1 [PATCH] kexec cod... |
981 |
if (result) |
dc009d924 [PATCH] kexec: ad... |
982 |
goto out; |
72414d3f1 [PATCH] kexec cod... |
983 |
|
3ab835213 kexec jump |
984 985 |
if (flags & KEXEC_PRESERVE_CONTEXT) image->preserve_context = 1; |
dc009d924 [PATCH] kexec: ad... |
986 |
result = machine_kexec_prepare(image); |
72414d3f1 [PATCH] kexec cod... |
987 |
if (result) |
dc009d924 [PATCH] kexec: ad... |
988 |
goto out; |
72414d3f1 [PATCH] kexec cod... |
989 990 |
for (i = 0; i < nr_segments; i++) { |
dc009d924 [PATCH] kexec: ad... |
991 |
result = kimage_load_segment(image, &image->segment[i]); |
72414d3f1 [PATCH] kexec cod... |
992 |
if (result) |
dc009d924 [PATCH] kexec: ad... |
993 |
goto out; |
dc009d924 [PATCH] kexec: ad... |
994 |
} |
7fccf0326 kernel/kexec.c: m... |
995 |
kimage_terminate(image); |
558df7209 [S390] kdump: Add... |
996 997 |
if (flags & KEXEC_ON_CRASH) crash_unmap_reserved_pages(); |
dc009d924 [PATCH] kexec: ad... |
998 999 1000 |
} /* Install the new kernel, and Uninstall the old */ image = xchg(dest_image, image); |
72414d3f1 [PATCH] kexec cod... |
1001 |
out: |
8c5a1cf0a kexec: use a mute... |
1002 |
mutex_unlock(&kexec_mutex); |
dc009d924 [PATCH] kexec: ad... |
1003 |
kimage_free(image); |
72414d3f1 [PATCH] kexec cod... |
1004 |
|
dc009d924 [PATCH] kexec: ad... |
1005 1006 |
return result; } |
558df7209 [S390] kdump: Add... |
1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 |
/* * Add and remove page tables for crashkernel memory * * Provide an empty default implementation here -- architecture * code may override this */ void __weak crash_map_reserved_pages(void) {} void __weak crash_unmap_reserved_pages(void) {} |
dc009d924 [PATCH] kexec: ad... |
1018 |
#ifdef CONFIG_COMPAT |
ca2c405ab kexec/compat: con... |
1019 1020 1021 1022 |
COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry, compat_ulong_t, nr_segments, struct compat_kexec_segment __user *, segments, compat_ulong_t, flags) |
dc009d924 [PATCH] kexec: ad... |
1023 1024 1025 1026 1027 1028 1029 1030 |
{ struct compat_kexec_segment in; struct kexec_segment out, __user *ksegments; unsigned long i, result; /* Don't allow clients that don't understand the native * architecture to do anything. */ |
72414d3f1 [PATCH] kexec cod... |
1031 |
if ((flags & KEXEC_ARCH_MASK) == KEXEC_ARCH_DEFAULT) |
dc009d924 [PATCH] kexec: ad... |
1032 |
return -EINVAL; |
dc009d924 [PATCH] kexec: ad... |
1033 |
|
72414d3f1 [PATCH] kexec cod... |
1034 |
if (nr_segments > KEXEC_SEGMENT_MAX) |
dc009d924 [PATCH] kexec: ad... |
1035 |
return -EINVAL; |
dc009d924 [PATCH] kexec: ad... |
1036 1037 |
ksegments = compat_alloc_user_space(nr_segments * sizeof(out)); |
e1bebcf41 kernel/kexec.c: c... |
1038 |
for (i = 0; i < nr_segments; i++) { |
dc009d924 [PATCH] kexec: ad... |
1039 |
result = copy_from_user(&in, &segments[i], sizeof(in)); |
72414d3f1 [PATCH] kexec cod... |
1040 |
if (result) |
dc009d924 [PATCH] kexec: ad... |
1041 |
return -EFAULT; |
dc009d924 [PATCH] kexec: ad... |
1042 1043 1044 1045 1046 1047 1048 |
out.buf = compat_ptr(in.buf); out.bufsz = in.bufsz; out.mem = in.mem; out.memsz = in.memsz; result = copy_to_user(&ksegments[i], &out, sizeof(out)); |
72414d3f1 [PATCH] kexec cod... |
1049 |
if (result) |
dc009d924 [PATCH] kexec: ad... |
1050 |
return -EFAULT; |
dc009d924 [PATCH] kexec: ad... |
1051 1052 1053 1054 1055 |
} return sys_kexec_load(entry, nr_segments, ksegments, flags); } #endif |
6e274d144 [PATCH] kdump: Us... |
1056 |
void crash_kexec(struct pt_regs *regs) |
dc009d924 [PATCH] kexec: ad... |
1057 |
{ |
8c5a1cf0a kexec: use a mute... |
1058 |
/* Take the kexec_mutex here to prevent sys_kexec_load |
dc009d924 [PATCH] kexec: ad... |
1059 1060 1061 1062 1063 1064 1065 |
* running on one cpu from replacing the crash kernel * we are using after a panic on a different cpu. * * If the crash kernel was not located in a fixed area * of memory the xchg(&kexec_crash_image) would be * sufficient. But since I reuse the memory... */ |
8c5a1cf0a kexec: use a mute... |
1066 |
if (mutex_trylock(&kexec_mutex)) { |
c0ce7d088 [POWERPC] Add the... |
1067 |
if (kexec_crash_image) { |
e996e5813 [PATCH] kdump: sa... |
1068 |
struct pt_regs fixed_regs; |
0f4bd46ec kmsg_dump: Dump o... |
1069 |
|
e996e5813 [PATCH] kdump: sa... |
1070 |
crash_setup_regs(&fixed_regs, regs); |
fd59d231f Add vmcoreinfo |
1071 |
crash_save_vmcoreinfo(); |
e996e5813 [PATCH] kdump: sa... |
1072 |
machine_crash_shutdown(&fixed_regs); |
c0ce7d088 [POWERPC] Add the... |
1073 |
machine_kexec(kexec_crash_image); |
dc009d924 [PATCH] kexec: ad... |
1074 |
} |
8c5a1cf0a kexec: use a mute... |
1075 |
mutex_unlock(&kexec_mutex); |
dc009d924 [PATCH] kexec: ad... |
1076 1077 |
} } |
cc5716587 [PATCH] kdump: dy... |
1078 |
|
06a7f7112 kexec: premit red... |
1079 1080 |
size_t crash_get_memory_size(void) { |
e05bd3367 kexec: fix Oops i... |
1081 |
size_t size = 0; |
06a7f7112 kexec: premit red... |
1082 |
mutex_lock(&kexec_mutex); |
e05bd3367 kexec: fix Oops i... |
1083 |
if (crashk_res.end != crashk_res.start) |
28f65c11f treewide: Convert... |
1084 |
size = resource_size(&crashk_res); |
06a7f7112 kexec: premit red... |
1085 1086 1087 |
mutex_unlock(&kexec_mutex); return size; } |
c0bb9e45f kdump: Allow shri... |
1088 1089 |
void __weak crash_free_reserved_phys_range(unsigned long begin, unsigned long end) |
06a7f7112 kexec: premit red... |
1090 1091 |
{ unsigned long addr; |
e07cee23e mm,kexec: use com... |
1092 1093 |
for (addr = begin; addr < end; addr += PAGE_SIZE) free_reserved_page(pfn_to_page(addr >> PAGE_SHIFT)); |
06a7f7112 kexec: premit red... |
1094 1095 1096 1097 1098 1099 |
} int crash_shrink_memory(unsigned long new_size) { int ret = 0; unsigned long start, end; |
bec013c40 kdump: crashk_res... |
1100 |
unsigned long old_size; |
6480e5a09 kdump: add missin... |
1101 |
struct resource *ram_res; |
06a7f7112 kexec: premit red... |
1102 1103 1104 1105 1106 1107 1108 1109 1110 |
mutex_lock(&kexec_mutex); if (kexec_crash_image) { ret = -ENOENT; goto unlock; } start = crashk_res.start; end = crashk_res.end; |
bec013c40 kdump: crashk_res... |
1111 1112 1113 |
old_size = (end == 0) ? 0 : end - start + 1; if (new_size >= old_size) { ret = (new_size == old_size) ? 0 : -EINVAL; |
06a7f7112 kexec: premit red... |
1114 1115 |
goto unlock; } |
6480e5a09 kdump: add missin... |
1116 1117 1118 1119 1120 |
ram_res = kzalloc(sizeof(*ram_res), GFP_KERNEL); if (!ram_res) { ret = -ENOMEM; goto unlock; } |
558df7209 [S390] kdump: Add... |
1121 1122 |
start = roundup(start, KEXEC_CRASH_MEM_ALIGN); end = roundup(start + new_size, KEXEC_CRASH_MEM_ALIGN); |
06a7f7112 kexec: premit red... |
1123 |
|
558df7209 [S390] kdump: Add... |
1124 |
crash_map_reserved_pages(); |
c0bb9e45f kdump: Allow shri... |
1125 |
crash_free_reserved_phys_range(end, crashk_res.end); |
06a7f7112 kexec: premit red... |
1126 |
|
e05bd3367 kexec: fix Oops i... |
1127 |
if ((start == end) && (crashk_res.parent != NULL)) |
06a7f7112 kexec: premit red... |
1128 |
release_resource(&crashk_res); |
6480e5a09 kdump: add missin... |
1129 1130 1131 1132 1133 |
ram_res->start = end; ram_res->end = crashk_res.end; ram_res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; ram_res->name = "System RAM"; |
475f9aa6a kexec: fix OOPS i... |
1134 |
crashk_res.end = end - 1; |
6480e5a09 kdump: add missin... |
1135 1136 |
insert_resource(&iomem_resource, ram_res); |
558df7209 [S390] kdump: Add... |
1137 |
crash_unmap_reserved_pages(); |
06a7f7112 kexec: premit red... |
1138 1139 1140 1141 1142 |
unlock: mutex_unlock(&kexec_mutex); return ret; } |
85916f816 [PATCH] Kexec / K... |
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 |
static u32 *append_elf_note(u32 *buf, char *name, unsigned type, void *data, size_t data_len) { struct elf_note note; note.n_namesz = strlen(name) + 1; note.n_descsz = data_len; note.n_type = type; memcpy(buf, ¬e, sizeof(note)); buf += (sizeof(note) + 3)/4; memcpy(buf, name, note.n_namesz); buf += (note.n_namesz + 3)/4; memcpy(buf, data, note.n_descsz); buf += (note.n_descsz + 3)/4; return buf; } static void final_note(u32 *buf) { struct elf_note note; note.n_namesz = 0; note.n_descsz = 0; note.n_type = 0; memcpy(buf, ¬e, sizeof(note)); } void crash_save_cpu(struct pt_regs *regs, int cpu) { struct elf_prstatus prstatus; u32 *buf; |
4f4b6c1a9 cpumask: prepare ... |
1175 |
if ((cpu < 0) || (cpu >= nr_cpu_ids)) |
85916f816 [PATCH] Kexec / K... |
1176 1177 1178 1179 1180 1181 1182 1183 1184 |
return; /* Using ELF notes here is opportunistic. * I need a well defined structure format * for the data I pass, and I need tags * on the data to indicate what information I have * squirrelled away. ELF notes happen to provide * all of that, so there is no need to invent something new. */ |
e1bebcf41 kernel/kexec.c: c... |
1185 |
buf = (u32 *)per_cpu_ptr(crash_notes, cpu); |
85916f816 [PATCH] Kexec / K... |
1186 1187 1188 1189 |
if (!buf) return; memset(&prstatus, 0, sizeof(prstatus)); prstatus.pr_pid = current->pid; |
6cd61c0ba elf: add ELF_CORE... |
1190 |
elf_core_copy_kernel_regs(&prstatus.pr_reg, regs); |
6672f76a5 kdump/kexec: calc... |
1191 |
buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS, |
e1bebcf41 kernel/kexec.c: c... |
1192 |
&prstatus, sizeof(prstatus)); |
85916f816 [PATCH] Kexec / K... |
1193 1194 |
final_note(buf); } |
cc5716587 [PATCH] kdump: dy... |
1195 1196 1197 1198 1199 |
static int __init crash_notes_memory_init(void) { /* Allocate memory for saving cpu registers. */ crash_notes = alloc_percpu(note_buf_t); if (!crash_notes) { |
e1bebcf41 kernel/kexec.c: c... |
1200 1201 |
pr_warn("Kexec: Memory allocation for saving cpu register states failed "); |
cc5716587 [PATCH] kdump: dy... |
1202 1203 1204 1205 |
return -ENOMEM; } return 0; } |
c96d6660d kernel: audit/fix... |
1206 |
subsys_initcall(crash_notes_memory_init); |
fd59d231f Add vmcoreinfo |
1207 |
|
cba63c308 Extended crashker... |
1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 |
/* * parsing the "crashkernel" commandline * * this code is intended to be called from architecture specific code */ /* * This function parses command lines in the format * * crashkernel=ramsize-range:size[,...][@offset] * * The function returns 0 on success and -EINVAL on failure. */ |
e1bebcf41 kernel/kexec.c: c... |
1223 1224 1225 1226 |
static int __init parse_crashkernel_mem(char *cmdline, unsigned long long system_ram, unsigned long long *crash_size, unsigned long long *crash_base) |
cba63c308 Extended crashker... |
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 |
{ char *cur = cmdline, *tmp; /* for each entry of the comma-separated list */ do { unsigned long long start, end = ULLONG_MAX, size; /* get the start of the range */ start = memparse(cur, &tmp); if (cur == tmp) { |
e1bebcf41 kernel/kexec.c: c... |
1237 1238 |
pr_warn("crashkernel: Memory value expected "); |
cba63c308 Extended crashker... |
1239 1240 1241 1242 |
return -EINVAL; } cur = tmp; if (*cur != '-') { |
e1bebcf41 kernel/kexec.c: c... |
1243 1244 |
pr_warn("crashkernel: '-' expected "); |
cba63c308 Extended crashker... |
1245 1246 1247 1248 1249 1250 1251 1252 |
return -EINVAL; } cur++; /* if no ':' is here, than we read the end */ if (*cur != ':') { end = memparse(cur, &tmp); if (cur == tmp) { |
e1bebcf41 kernel/kexec.c: c... |
1253 1254 |
pr_warn("crashkernel: Memory value expected "); |
cba63c308 Extended crashker... |
1255 1256 1257 1258 |
return -EINVAL; } cur = tmp; if (end <= start) { |
e1bebcf41 kernel/kexec.c: c... |
1259 1260 |
pr_warn("crashkernel: end <= start "); |
cba63c308 Extended crashker... |
1261 1262 1263 1264 1265 |
return -EINVAL; } } if (*cur != ':') { |
e1bebcf41 kernel/kexec.c: c... |
1266 1267 |
pr_warn("crashkernel: ':' expected "); |
cba63c308 Extended crashker... |
1268 1269 1270 1271 1272 1273 |
return -EINVAL; } cur++; size = memparse(cur, &tmp); if (cur == tmp) { |
e1bebcf41 kernel/kexec.c: c... |
1274 1275 |
pr_warn("Memory value expected "); |
cba63c308 Extended crashker... |
1276 1277 1278 1279 |
return -EINVAL; } cur = tmp; if (size >= system_ram) { |
e1bebcf41 kernel/kexec.c: c... |
1280 1281 |
pr_warn("crashkernel: invalid size "); |
cba63c308 Extended crashker... |
1282 1283 1284 1285 |
return -EINVAL; } /* match ? */ |
be089d79c kexec: make exten... |
1286 |
if (system_ram >= start && system_ram < end) { |
cba63c308 Extended crashker... |
1287 1288 1289 1290 1291 1292 |
*crash_size = size; break; } } while (*cur++ == ','); if (*crash_size > 0) { |
11c7da4b0 kexec: fix omitti... |
1293 |
while (*cur && *cur != ' ' && *cur != '@') |
cba63c308 Extended crashker... |
1294 1295 1296 1297 1298 |
cur++; if (*cur == '@') { cur++; *crash_base = memparse(cur, &tmp); if (cur == tmp) { |
e1bebcf41 kernel/kexec.c: c... |
1299 1300 |
pr_warn("Memory value expected after '@' "); |
cba63c308 Extended crashker... |
1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 |
return -EINVAL; } } } return 0; } /* * That function parses "simple" (old) crashkernel command lines like * |
e1bebcf41 kernel/kexec.c: c... |
1312 |
* crashkernel=size[@offset] |
cba63c308 Extended crashker... |
1313 1314 1315 |
* * It returns 0 on success and -EINVAL on failure. */ |
e1bebcf41 kernel/kexec.c: c... |
1316 1317 1318 |
static int __init parse_crashkernel_simple(char *cmdline, unsigned long long *crash_size, unsigned long long *crash_base) |
cba63c308 Extended crashker... |
1319 1320 1321 1322 1323 |
{ char *cur = cmdline; *crash_size = memparse(cmdline, &cur); if (cmdline == cur) { |
e1bebcf41 kernel/kexec.c: c... |
1324 1325 |
pr_warn("crashkernel: memory value expected "); |
cba63c308 Extended crashker... |
1326 1327 1328 1329 1330 |
return -EINVAL; } if (*cur == '@') *crash_base = memparse(cur+1, &cur); |
eaa3be6ad kexec: add furthe... |
1331 |
else if (*cur != ' ' && *cur != '\0') { |
e1bebcf41 kernel/kexec.c: c... |
1332 1333 |
pr_warn("crashkernel: unrecognized char "); |
eaa3be6ad kexec: add furthe... |
1334 1335 |
return -EINVAL; } |
cba63c308 Extended crashker... |
1336 1337 1338 |
return 0; } |
adbc742bf x86, kdump: Chang... |
1339 1340 1341 1342 1343 1344 1345 1346 |
#define SUFFIX_HIGH 0 #define SUFFIX_LOW 1 #define SUFFIX_NULL 2 static __initdata char *suffix_tbl[] = { [SUFFIX_HIGH] = ",high", [SUFFIX_LOW] = ",low", [SUFFIX_NULL] = NULL, }; |
cba63c308 Extended crashker... |
1347 |
/* |
adbc742bf x86, kdump: Chang... |
1348 1349 1350 1351 1352 |
* That function parses "suffix" crashkernel command lines like * * crashkernel=size,[high|low] * * It returns 0 on success and -EINVAL on failure. |
cba63c308 Extended crashker... |
1353 |
*/ |
adbc742bf x86, kdump: Chang... |
1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 |
static int __init parse_crashkernel_suffix(char *cmdline, unsigned long long *crash_size, unsigned long long *crash_base, const char *suffix) { char *cur = cmdline; *crash_size = memparse(cmdline, &cur); if (cmdline == cur) { pr_warn("crashkernel: memory value expected "); return -EINVAL; } /* check with suffix */ if (strncmp(cur, suffix, strlen(suffix))) { pr_warn("crashkernel: unrecognized char "); return -EINVAL; } cur += strlen(suffix); if (*cur != ' ' && *cur != '\0') { pr_warn("crashkernel: unrecognized char "); return -EINVAL; } return 0; } static __init char *get_last_crashkernel(char *cmdline, const char *name, const char *suffix) { char *p = cmdline, *ck_cmdline = NULL; /* find crashkernel and use the last one if there are more */ p = strstr(p, name); while (p) { char *end_p = strchr(p, ' '); char *q; if (!end_p) end_p = p + strlen(p); if (!suffix) { int i; /* skip the one with any known suffix */ for (i = 0; suffix_tbl[i]; i++) { q = end_p - strlen(suffix_tbl[i]); if (!strncmp(q, suffix_tbl[i], strlen(suffix_tbl[i]))) goto next; } ck_cmdline = p; } else { q = end_p - strlen(suffix); if (!strncmp(q, suffix, strlen(suffix))) ck_cmdline = p; } next: p = strstr(p+1, name); } if (!ck_cmdline) return NULL; return ck_cmdline; } |
0212f9159 x86: Add Crash ke... |
1424 |
static int __init __parse_crashkernel(char *cmdline, |
cba63c308 Extended crashker... |
1425 1426 |
unsigned long long system_ram, unsigned long long *crash_size, |
0212f9159 x86: Add Crash ke... |
1427 |
unsigned long long *crash_base, |
adbc742bf x86, kdump: Chang... |
1428 1429 |
const char *name, const char *suffix) |
cba63c308 Extended crashker... |
1430 |
{ |
cba63c308 Extended crashker... |
1431 |
char *first_colon, *first_space; |
adbc742bf x86, kdump: Chang... |
1432 |
char *ck_cmdline; |
cba63c308 Extended crashker... |
1433 1434 1435 1436 |
BUG_ON(!crash_size || !crash_base); *crash_size = 0; *crash_base = 0; |
adbc742bf x86, kdump: Chang... |
1437 |
ck_cmdline = get_last_crashkernel(cmdline, name, suffix); |
cba63c308 Extended crashker... |
1438 1439 1440 |
if (!ck_cmdline) return -EINVAL; |
0212f9159 x86: Add Crash ke... |
1441 |
ck_cmdline += strlen(name); |
cba63c308 Extended crashker... |
1442 |
|
adbc742bf x86, kdump: Chang... |
1443 1444 1445 |
if (suffix) return parse_crashkernel_suffix(ck_cmdline, crash_size, crash_base, suffix); |
cba63c308 Extended crashker... |
1446 1447 1448 1449 1450 1451 1452 1453 1454 |
/* * if the commandline contains a ':', then that's the extended * syntax -- if not, it must be the classic syntax */ first_colon = strchr(ck_cmdline, ':'); first_space = strchr(ck_cmdline, ' '); if (first_colon && (!first_space || first_colon < first_space)) return parse_crashkernel_mem(ck_cmdline, system_ram, crash_size, crash_base); |
cba63c308 Extended crashker... |
1455 |
|
80c74f6a4 kexec: remove unn... |
1456 |
return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base); |
cba63c308 Extended crashker... |
1457 |
} |
adbc742bf x86, kdump: Chang... |
1458 1459 1460 1461 |
/* * That function is the entry point for command line parsing and should be * called from the arch-specific code. */ |
0212f9159 x86: Add Crash ke... |
1462 1463 1464 1465 1466 1467 |
int __init parse_crashkernel(char *cmdline, unsigned long long system_ram, unsigned long long *crash_size, unsigned long long *crash_base) { return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, |
adbc742bf x86, kdump: Chang... |
1468 |
"crashkernel=", NULL); |
0212f9159 x86: Add Crash ke... |
1469 |
} |
55a20ee78 x86, kdump: Retor... |
1470 1471 1472 1473 1474 1475 1476 |
int __init parse_crashkernel_high(char *cmdline, unsigned long long system_ram, unsigned long long *crash_size, unsigned long long *crash_base) { return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, |
adbc742bf x86, kdump: Chang... |
1477 |
"crashkernel=", suffix_tbl[SUFFIX_HIGH]); |
55a20ee78 x86, kdump: Retor... |
1478 |
} |
0212f9159 x86: Add Crash ke... |
1479 1480 1481 1482 1483 1484 1485 |
int __init parse_crashkernel_low(char *cmdline, unsigned long long system_ram, unsigned long long *crash_size, unsigned long long *crash_base) { return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, |
adbc742bf x86, kdump: Chang... |
1486 |
"crashkernel=", suffix_tbl[SUFFIX_LOW]); |
0212f9159 x86: Add Crash ke... |
1487 |
} |
cba63c308 Extended crashker... |
1488 |
|
fa8ff292b [S390] kdump: Ini... |
1489 |
static void update_vmcoreinfo_note(void) |
fd59d231f Add vmcoreinfo |
1490 |
{ |
fa8ff292b [S390] kdump: Ini... |
1491 |
u32 *buf = vmcoreinfo_note; |
fd59d231f Add vmcoreinfo |
1492 1493 1494 |
if (!vmcoreinfo_size) return; |
fd59d231f Add vmcoreinfo |
1495 1496 |
buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data, vmcoreinfo_size); |
fd59d231f Add vmcoreinfo |
1497 1498 |
final_note(buf); } |
fa8ff292b [S390] kdump: Ini... |
1499 1500 |
void crash_save_vmcoreinfo(void) { |
63dca8d5b kdump: append new... |
1501 1502 |
vmcoreinfo_append_str("CRASHTIME=%ld ", get_seconds()); |
fa8ff292b [S390] kdump: Ini... |
1503 1504 |
update_vmcoreinfo_note(); } |
fd59d231f Add vmcoreinfo |
1505 1506 1507 1508 |
void vmcoreinfo_append_str(const char *fmt, ...) { va_list args; char buf[0x50]; |
310faaa9b kexec: fix wrong ... |
1509 |
size_t r; |
fd59d231f Add vmcoreinfo |
1510 1511 |
va_start(args, fmt); |
a19428e5c kernel/kexec.c: u... |
1512 |
r = vscnprintf(buf, sizeof(buf), fmt, args); |
fd59d231f Add vmcoreinfo |
1513 |
va_end(args); |
31c3a3fe0 kexec: Use min() ... |
1514 |
r = min(r, vmcoreinfo_max_size - vmcoreinfo_size); |
fd59d231f Add vmcoreinfo |
1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 |
memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r); vmcoreinfo_size += r; } /* * provide an empty default implementation here -- architecture * code may override this */ |
52f5684c8 kernel: use macro... |
1525 |
void __weak arch_crash_save_vmcoreinfo(void) |
fd59d231f Add vmcoreinfo |
1526 |
{} |
52f5684c8 kernel: use macro... |
1527 |
unsigned long __weak paddr_vmcoreinfo_note(void) |
fd59d231f Add vmcoreinfo |
1528 1529 1530 1531 1532 1533 |
{ return __pa((unsigned long)(char *)&vmcoreinfo_note); } static int __init crash_save_vmcoreinfo_init(void) { |
bba1f603b vmcoreinfo: add "... |
1534 1535 |
VMCOREINFO_OSRELEASE(init_uts_ns.name.release); VMCOREINFO_PAGESIZE(PAGE_SIZE); |
fd59d231f Add vmcoreinfo |
1536 |
|
bcbba6c10 add-vmcore: add a... |
1537 1538 |
VMCOREINFO_SYMBOL(init_uts_ns); VMCOREINFO_SYMBOL(node_online_map); |
d034cfab4 kexec: crash: don... |
1539 |
#ifdef CONFIG_MMU |
bcbba6c10 add-vmcore: add a... |
1540 |
VMCOREINFO_SYMBOL(swapper_pg_dir); |
d034cfab4 kexec: crash: don... |
1541 |
#endif |
bcbba6c10 add-vmcore: add a... |
1542 |
VMCOREINFO_SYMBOL(_stext); |
f1c4069e1 mm, vmalloc: expo... |
1543 |
VMCOREINFO_SYMBOL(vmap_area_list); |
fd59d231f Add vmcoreinfo |
1544 1545 |
#ifndef CONFIG_NEED_MULTIPLE_NODES |
bcbba6c10 add-vmcore: add a... |
1546 1547 |
VMCOREINFO_SYMBOL(mem_map); VMCOREINFO_SYMBOL(contig_page_data); |
fd59d231f Add vmcoreinfo |
1548 1549 |
#endif #ifdef CONFIG_SPARSEMEM |
bcbba6c10 add-vmcore: add a... |
1550 1551 |
VMCOREINFO_SYMBOL(mem_section); VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS); |
c76f860c4 vmcoreinfo: renam... |
1552 |
VMCOREINFO_STRUCT_SIZE(mem_section); |
bcbba6c10 add-vmcore: add a... |
1553 |
VMCOREINFO_OFFSET(mem_section, section_mem_map); |
fd59d231f Add vmcoreinfo |
1554 |
#endif |
c76f860c4 vmcoreinfo: renam... |
1555 1556 1557 1558 1559 1560 |
VMCOREINFO_STRUCT_SIZE(page); VMCOREINFO_STRUCT_SIZE(pglist_data); VMCOREINFO_STRUCT_SIZE(zone); VMCOREINFO_STRUCT_SIZE(free_area); VMCOREINFO_STRUCT_SIZE(list_head); VMCOREINFO_SIZE(nodemask_t); |
bcbba6c10 add-vmcore: add a... |
1561 1562 1563 1564 |
VMCOREINFO_OFFSET(page, flags); VMCOREINFO_OFFSET(page, _count); VMCOREINFO_OFFSET(page, mapping); VMCOREINFO_OFFSET(page, lru); |
8d67091ec kexec: add the va... |
1565 1566 |
VMCOREINFO_OFFSET(page, _mapcount); VMCOREINFO_OFFSET(page, private); |
bcbba6c10 add-vmcore: add a... |
1567 1568 |
VMCOREINFO_OFFSET(pglist_data, node_zones); VMCOREINFO_OFFSET(pglist_data, nr_zones); |
fd59d231f Add vmcoreinfo |
1569 |
#ifdef CONFIG_FLAT_NODE_MEM_MAP |
bcbba6c10 add-vmcore: add a... |
1570 |
VMCOREINFO_OFFSET(pglist_data, node_mem_map); |
fd59d231f Add vmcoreinfo |
1571 |
#endif |
bcbba6c10 add-vmcore: add a... |
1572 1573 1574 1575 1576 1577 1578 1579 1580 |
VMCOREINFO_OFFSET(pglist_data, node_start_pfn); VMCOREINFO_OFFSET(pglist_data, node_spanned_pages); VMCOREINFO_OFFSET(pglist_data, node_id); VMCOREINFO_OFFSET(zone, free_area); VMCOREINFO_OFFSET(zone, vm_stat); VMCOREINFO_OFFSET(zone, spanned_pages); VMCOREINFO_OFFSET(free_area, free_list); VMCOREINFO_OFFSET(list_head, next); VMCOREINFO_OFFSET(list_head, prev); |
13ba3fcbb kexec, vmalloc: e... |
1581 1582 |
VMCOREINFO_OFFSET(vmap_area, va_start); VMCOREINFO_OFFSET(vmap_area, list); |
bcbba6c10 add-vmcore: add a... |
1583 |
VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER); |
04d491ab2 kexec: add dmesg ... |
1584 |
log_buf_kexec_setup(); |
83a08e7c6 vmcoreinfo: add t... |
1585 |
VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES); |
bcbba6c10 add-vmcore: add a... |
1586 |
VMCOREINFO_NUMBER(NR_FREE_PAGES); |
122c7a590 vmcoreinfo: add p... |
1587 1588 1589 |
VMCOREINFO_NUMBER(PG_lru); VMCOREINFO_NUMBER(PG_private); VMCOREINFO_NUMBER(PG_swapcache); |
8d67091ec kexec: add the va... |
1590 |
VMCOREINFO_NUMBER(PG_slab); |
0d0bf6674 kexec: export PG_... |
1591 1592 1593 |
#ifdef CONFIG_MEMORY_FAILURE VMCOREINFO_NUMBER(PG_hwpoison); #endif |
b3acc56bf kexec: save PG_he... |
1594 |
VMCOREINFO_NUMBER(PG_head_mask); |
8d67091ec kexec: add the va... |
1595 |
VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE); |
3a1122d26 kexec: fix build ... |
1596 |
#ifdef CONFIG_HUGETLBFS |
8f1d26d0e kexec: export fre... |
1597 |
VMCOREINFO_SYMBOL(free_huge_page); |
3a1122d26 kexec: fix build ... |
1598 |
#endif |
fd59d231f Add vmcoreinfo |
1599 1600 |
arch_crash_save_vmcoreinfo(); |
fa8ff292b [S390] kdump: Ini... |
1601 |
update_vmcoreinfo_note(); |
fd59d231f Add vmcoreinfo |
1602 1603 1604 |
return 0; } |
c96d6660d kernel: audit/fix... |
1605 |
subsys_initcall(crash_save_vmcoreinfo_init); |
3ab835213 kexec jump |
1606 |
|
7ade3fcc1 kexec jump: clean... |
1607 1608 1609 |
/* * Move into place and start executing a preloaded standalone * executable. If nothing was preloaded return an error. |
3ab835213 kexec jump |
1610 1611 1612 1613 |
*/ int kernel_kexec(void) { int error = 0; |
8c5a1cf0a kexec: use a mute... |
1614 |
if (!mutex_trylock(&kexec_mutex)) |
3ab835213 kexec jump |
1615 1616 1617 1618 1619 |
return -EBUSY; if (!kexec_image) { error = -EINVAL; goto Unlock; } |
3ab835213 kexec jump |
1620 |
#ifdef CONFIG_KEXEC_JUMP |
7ade3fcc1 kexec jump: clean... |
1621 |
if (kexec_image->preserve_context) { |
bcda53faf PM / Sleep: Repla... |
1622 |
lock_system_sleep(); |
89081d17f kexec jump: save/... |
1623 1624 1625 1626 1627 1628 1629 |
pm_prepare_console(); error = freeze_processes(); if (error) { error = -EBUSY; goto Restore_console; } suspend_console(); |
d16163029 PM core: rename s... |
1630 |
error = dpm_suspend_start(PMSG_FREEZE); |
89081d17f kexec jump: save/... |
1631 1632 |
if (error) goto Resume_console; |
d16163029 PM core: rename s... |
1633 |
/* At this point, dpm_suspend_start() has been called, |
cf579dfb8 PM / Sleep: Intro... |
1634 1635 |
* but *not* dpm_suspend_end(). We *must* call * dpm_suspend_end() now. Otherwise, drivers for |
89081d17f kexec jump: save/... |
1636 1637 1638 1639 |
* some devices (e.g. interrupt controllers) become * desynchronized with the actual state of the * hardware at resume time, and evil weirdness ensues. */ |
cf579dfb8 PM / Sleep: Intro... |
1640 |
error = dpm_suspend_end(PMSG_FREEZE); |
89081d17f kexec jump: save/... |
1641 |
if (error) |
749b0afc3 kexec: Change kex... |
1642 1643 1644 1645 |
goto Resume_devices; error = disable_nonboot_cpus(); if (error) goto Enable_cpus; |
2ed8d2b3a PM: Rework handli... |
1646 |
local_irq_disable(); |
2e711c04d PM: Remove sysdev... |
1647 |
error = syscore_suspend(); |
770824bdc PM: Split up sysd... |
1648 |
if (error) |
749b0afc3 kexec: Change kex... |
1649 |
goto Enable_irqs; |
7ade3fcc1 kexec jump: clean... |
1650 |
} else |
3ab835213 kexec jump |
1651 |
#endif |
7ade3fcc1 kexec jump: clean... |
1652 |
{ |
4fc9bbf98 PCI: Disable Bus ... |
1653 |
kexec_in_progress = true; |
ca195b7f6 kexec jump: remov... |
1654 |
kernel_restart_prepare(NULL); |
c97102ba9 kexec: migrate to... |
1655 |
migrate_to_reboot_cpu(); |
011e4b02f powerpc, kexec: F... |
1656 1657 1658 1659 1660 1661 1662 1663 |
/* * migrate_to_reboot_cpu() disables CPU hotplug assuming that * no further code needs to use CPU hotplug (which is true in * the reboot case). However, the kexec path depends on using * CPU hotplug again; so re-enable it here. */ cpu_hotplug_enable(); |
e1bebcf41 kernel/kexec.c: c... |
1664 1665 |
pr_emerg("Starting new kernel "); |
3ab835213 kexec jump |
1666 1667 1668 1669 |
machine_shutdown(); } machine_kexec(kexec_image); |
3ab835213 kexec jump |
1670 |
#ifdef CONFIG_KEXEC_JUMP |
7ade3fcc1 kexec jump: clean... |
1671 |
if (kexec_image->preserve_context) { |
19234c081 PM: Add missing s... |
1672 |
syscore_resume(); |
749b0afc3 kexec: Change kex... |
1673 |
Enable_irqs: |
3ab835213 kexec jump |
1674 |
local_irq_enable(); |
749b0afc3 kexec: Change kex... |
1675 |
Enable_cpus: |
89081d17f kexec jump: save/... |
1676 |
enable_nonboot_cpus(); |
cf579dfb8 PM / Sleep: Intro... |
1677 |
dpm_resume_start(PMSG_RESTORE); |
89081d17f kexec jump: save/... |
1678 |
Resume_devices: |
d16163029 PM core: rename s... |
1679 |
dpm_resume_end(PMSG_RESTORE); |
89081d17f kexec jump: save/... |
1680 1681 1682 1683 1684 |
Resume_console: resume_console(); thaw_processes(); Restore_console: pm_restore_console(); |
bcda53faf PM / Sleep: Repla... |
1685 |
unlock_system_sleep(); |
3ab835213 kexec jump |
1686 |
} |
7ade3fcc1 kexec jump: clean... |
1687 |
#endif |
3ab835213 kexec jump |
1688 1689 |
Unlock: |
8c5a1cf0a kexec: use a mute... |
1690 |
mutex_unlock(&kexec_mutex); |
3ab835213 kexec jump |
1691 1692 |
return error; } |