Currently, specifying '-d' on kexec command will print a lot of debugging
informationabout kexec/kdump loading with kexec_load interface.
However, kexec_file_load prints nothing even though '-d' is specified.
It's very inconvenient to debug or analyze the kexec/kdump loading when
something wrong happened with kexec/kdump itself or develper want to
check the kexec/kdump loading.
In this patchset, a kexec_file flag is KEXEC_FILE_DEBUG added and checked
in code. If it's passed in, debugging message of kexec_file code will be
printed out and can be seen from console and dmesg. Otherwise, the
debugging message is printed like beofre when pr_debug() is taken.
Note:
****
=====
1) The code in kexec-tools utility also need be changed to support
passing KEXEC_FILE_DEBUG to kernel when 'kexec -s -d' is specified.
The patch link is here:
=========
[PATCH] kexec_file: add kexec_file flag to support debug printing
http://lists.infradead.org/pipermail/kexec/2023-November/028505.html
2) s390 also has kexec_file code, while I am not sure what debugging
information is necessary. So leave it to s390 developer.
Test:
****
====
Testing was done in v1 on x86_64 and arm64. For v4, tested on x86_64
again. And on x86_64, the printed messages look like below:
--------------------------------------------------------------
kexec measurement buffer for the loaded kernel at 0x207fffe000.
Loaded purgatory at 0x207fff9000
Loaded boot_param, command line and misc at 0x207fff3000 bufsz=0x1180 memsz=0x1180
Loaded 64bit kernel at 0x207c000000 bufsz=0xc88200 memsz=0x3c4a000
Loaded initrd at 0x2079e79000 bufsz=0x2186280 memsz=0x2186280
Final command line is: root=/dev/mapper/fedora_intel--knightslanding--lb--02-root ro
rd.lvm.lv=fedora_intel-knightslanding-lb-02/root console=ttyS0,115200N81 crashkernel=256M
E820 memmap:
0000000000000000-000000000009a3ff (1)
000000000009a400-000000000009ffff (2)
00000000000e0000-00000000000fffff (2)
0000000000100000-000000006ff83fff (1)
000000006ff84000-000000007ac50fff (2)
......
000000207fff6150-000000207fff615f (128)
000000207fff6160-000000207fff714f (1)
000000207fff7150-000000207fff715f (128)
000000207fff7160-000000207fff814f (1)
000000207fff8150-000000207fff815f (128)
000000207fff8160-000000207fffffff (1)
nr_segments = 5
segment[0]: buf=0x000000004e5ece74 bufsz=0x211 mem=0x207fffe000 memsz=0x1000
segment[1]: buf=0x000000009e871498 bufsz=0x4000 mem=0x207fff9000 memsz=0x5000
segment[2]: buf=0x00000000d879f1fe bufsz=0x1180 mem=0x207fff3000 memsz=0x2000
segment[3]: buf=0x000000001101cd86 bufsz=0xc88200 mem=0x207c000000 memsz=0x3c4a000
segment[4]: buf=0x00000000c6e38ac7 bufsz=0x2186280 mem=0x2079e79000 memsz=0x2187000
kexec_file_load: type:0, start:0x207fff91a0 head:0x109e004002 flags:0x8
---------------------------------------------------------------------------
History:
=========
v3->v4:
- Add the explanation about why kexec_dprintk() need be introduced to
replace pr_debug() in log of ARCH patch, suggested by Conor.
- Mentioned why pr_notice() need be replaced with kexec_dprintk() in
function elf_kexec_load() of risc-v, Suggested by Conor.
- Change breaking one message line into two back to one line, pointed
out by Joe.
v2->v3:
- Adjust all the indentation of continuation line to the open parenthesis
for all kexec_dprintk() call sites. Thank Joe to point this out.
- Fix the LKP report that macro kexec_dprintk() is invalid when
CONFIG_KEXEC=Y, CONFIG_KEXEC_FILE=n, CONFIG_CRASH_DUMP=y.
v1->v2:
- Take the new format of kexec_dprintk() suggested by Joe which can
reduce kernel text size.
- Fix building error of patch 2 in kernel/crash_core.c reported by LKP.
- Fix building warning on arm64 in patch 4 reported by LKP.
Baoquan He (7):
kexec_file: add kexec_file flag to control debug printing
kexec_file: print out debugging message if required
kexec_file, x86: print out debugging message if required
kexec_file, arm64: print out debugging message if required
kexec_file, ricv: print out debugging message if required
kexec_file, power: print out debugging message if required
kexec_file, parisc: print out debugging message if required
arch/arm64/kernel/kexec_image.c | 6 +++---
arch/arm64/kernel/machine_kexec.c | 26 ++++++--------------------
arch/arm64/kernel/machine_kexec_file.c | 12 ++++++------
arch/parisc/kernel/kexec_file.c | 8 ++++----
arch/powerpc/kexec/elf_64.c | 8 ++++----
arch/powerpc/kexec/file_load_64.c | 18 +++++++++---------
arch/riscv/kernel/elf_kexec.c | 11 ++++++-----
arch/riscv/kernel/machine_kexec.c | 26 --------------------------
arch/x86/kernel/crash.c | 4 ++--
arch/x86/kernel/kexec-bzimage64.c | 23 ++++++++++++++---------
include/linux/kexec.h | 9 ++++++++-
include/uapi/linux/kexec.h | 1 +
kernel/crash_core.c | 8 +++++---
kernel/kexec_core.c | 2 ++
kernel/kexec_file.c | 14 +++++++++++---
security/integrity/ima/ima_kexec.c | 4 ++--
16 files changed, 83 insertions(+), 97 deletions(-)
--
2.41.0
Then when specifying '-d' for kexec_file_load interface, loaded
locations of kernel/initrd/cmdline etc can be printed out to help
debug.
Here replace pr_debug() with the newly added kexec_dprintk() in
kexec_file loading related codes.
And also print out type/start/head of kimage and flags to help debug.
Signed-off-by: Baoquan He <[email protected]>
---
kernel/crash_core.c | 8 +++++---
kernel/kexec_file.c | 11 ++++++++---
security/integrity/ima/ima_kexec.c | 4 ++--
3 files changed, 15 insertions(+), 8 deletions(-)
diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index efe87d501c8c..380d0d3acc7b 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -551,9 +551,11 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
phdr->p_filesz = phdr->p_memsz = mend - mstart + 1;
phdr->p_align = 0;
ehdr->e_phnum++;
- pr_debug("Crash PT_LOAD ELF header. phdr=%p vaddr=0x%llx, paddr=0x%llx, sz=0x%llx e_phnum=%d p_offset=0x%llx\n",
- phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz,
- ehdr->e_phnum, phdr->p_offset);
+#ifdef CONFIG_KEXEC_FILE
+ kexec_dprintk("Crash PT_LOAD ELF header. phdr=%p vaddr=0x%llx, paddr=0x%llx, sz=0x%llx e_phnum=%d p_offset=0x%llx\n",
+ phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz,
+ ehdr->e_phnum, phdr->p_offset);
+#endif
phdr++;
}
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index aca5dac74044..76de1ac7c424 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -204,6 +204,8 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
if (ret < 0)
return ret;
image->kernel_buf_len = ret;
+ kexec_dprintk("kernel: %p kernel_size: %#lx\n",
+ image->kernel_buf, image->kernel_buf_len);
/* Call arch image probe handlers */
ret = arch_kexec_kernel_image_probe(image, image->kernel_buf,
@@ -387,13 +389,14 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
if (ret)
goto out;
+ kexec_dprintk("nr_segments = %lu\n", image->nr_segments);
for (i = 0; i < image->nr_segments; i++) {
struct kexec_segment *ksegment;
ksegment = &image->segment[i];
- pr_debug("Loading segment %d: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
- i, ksegment->buf, ksegment->bufsz, ksegment->mem,
- ksegment->memsz);
+ kexec_dprintk("segment[%d]: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
+ i, ksegment->buf, ksegment->bufsz, ksegment->mem,
+ ksegment->memsz);
ret = kimage_load_segment(image, &image->segment[i]);
if (ret)
@@ -406,6 +409,8 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
if (ret)
goto out;
+ kexec_dprintk("kexec_file_load: type:%u, start:0x%lx head:0x%lx flags:0x%lx\n",
+ image->type, image->start, image->head, flags);
/*
* Free up any temporary buffers allocated which are not needed
* after image has been loaded
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index ad133fe120db..dadc1d138118 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -129,8 +129,8 @@ void ima_add_kexec_buffer(struct kimage *image)
image->ima_buffer_size = kexec_segment_size;
image->ima_buffer = kexec_buffer;
- pr_debug("kexec measurement buffer for the loaded kernel at 0x%lx.\n",
- kbuf.mem);
+ kexec_dprintk("kexec measurement buffer for the loaded kernel at 0x%lx.\n",
+ kbuf.mem);
}
#endif /* IMA_KEXEC */
--
2.41.0
Then when specifying '-d' for kexec_file_load interface, loaded
locations of kernel/initrd/cmdline etc can be printed out to help
debug.
Here replace pr_debug() with the newly added kexec_dprintk() in
kexec_file loading related codes.
And also remove the kimage->segment[] printing because the generic code
has done the printing.
Signed-off-by: Baoquan He <[email protected]>
---
arch/arm64/kernel/kexec_image.c | 6 +++---
arch/arm64/kernel/machine_kexec.c | 26 ++++++--------------------
arch/arm64/kernel/machine_kexec_file.c | 12 ++++++------
3 files changed, 15 insertions(+), 29 deletions(-)
diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c
index 636be6715155..532d72ea42ee 100644
--- a/arch/arm64/kernel/kexec_image.c
+++ b/arch/arm64/kernel/kexec_image.c
@@ -122,9 +122,9 @@ static void *image_load(struct kimage *image,
kernel_segment->memsz -= text_offset;
image->start = kernel_segment->mem;
- pr_debug("Loaded kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
- kernel_segment->mem, kbuf.bufsz,
- kernel_segment->memsz);
+ kexec_dprintk("Loaded kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+ kernel_segment->mem, kbuf.bufsz,
+ kernel_segment->memsz);
return NULL;
}
diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
index 078910db77a4..b38aae5b488d 100644
--- a/arch/arm64/kernel/machine_kexec.c
+++ b/arch/arm64/kernel/machine_kexec.c
@@ -32,26 +32,12 @@
static void _kexec_image_info(const char *func, int line,
const struct kimage *kimage)
{
- unsigned long i;
-
- pr_debug("%s:%d:\n", func, line);
- pr_debug(" kexec kimage info:\n");
- pr_debug(" type: %d\n", kimage->type);
- pr_debug(" start: %lx\n", kimage->start);
- pr_debug(" head: %lx\n", kimage->head);
- pr_debug(" nr_segments: %lu\n", kimage->nr_segments);
- pr_debug(" dtb_mem: %pa\n", &kimage->arch.dtb_mem);
- pr_debug(" kern_reloc: %pa\n", &kimage->arch.kern_reloc);
- pr_debug(" el2_vectors: %pa\n", &kimage->arch.el2_vectors);
-
- for (i = 0; i < kimage->nr_segments; i++) {
- pr_debug(" segment[%lu]: %016lx - %016lx, 0x%lx bytes, %lu pages\n",
- i,
- kimage->segment[i].mem,
- kimage->segment[i].mem + kimage->segment[i].memsz,
- kimage->segment[i].memsz,
- kimage->segment[i].memsz / PAGE_SIZE);
- }
+ kexec_dprintk("%s:%d:\n", func, line);
+ kexec_dprintk(" kexec kimage info:\n");
+ kexec_dprintk(" type: %d\n", kimage->type);
+ kexec_dprintk(" head: %lx\n", kimage->head);
+ kexec_dprintk(" kern_reloc: %pa\n", &kimage->arch.kern_reloc);
+ kexec_dprintk(" el2_vectors: %pa\n", &kimage->arch.el2_vectors);
}
void machine_kexec_cleanup(struct kimage *kimage)
diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index a11a6e14ba89..0e017358f4ba 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -127,8 +127,8 @@ int load_other_segments(struct kimage *image,
image->elf_load_addr = kbuf.mem;
image->elf_headers_sz = headers_sz;
- pr_debug("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
- image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
+ kexec_dprintk("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+ image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
}
/* load initrd */
@@ -148,8 +148,8 @@ int load_other_segments(struct kimage *image,
goto out_err;
initrd_load_addr = kbuf.mem;
- pr_debug("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
- initrd_load_addr, kbuf.bufsz, kbuf.memsz);
+ kexec_dprintk("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+ initrd_load_addr, kbuf.bufsz, kbuf.memsz);
}
/* load dtb */
@@ -179,8 +179,8 @@ int load_other_segments(struct kimage *image,
image->arch.dtb = dtb;
image->arch.dtb_mem = kbuf.mem;
- pr_debug("Loaded dtb at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
- kbuf.mem, kbuf.bufsz, kbuf.memsz);
+ kexec_dprintk("Loaded dtb at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+ kbuf.mem, kbuf.bufsz, kbuf.memsz);
return 0;
--
2.41.0
Then when specifying '-d' for kexec_file_load interface, loaded
locations of kernel/initrd/cmdline etc can be printed out to help
debug.
Here replace pr_debug() with the newly added kexec_dprintk() in
kexec_file loading related codes.
And also print out e820 memmap passed to 2nd kernel just as kexec_load
interface has been doing.
Signed-off-by: Baoquan He <[email protected]>
---
arch/x86/kernel/crash.c | 4 ++--
arch/x86/kernel/kexec-bzimage64.c | 23 ++++++++++++++---------
2 files changed, 16 insertions(+), 11 deletions(-)
diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index c92d88680dbf..1715e5f06a59 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -386,8 +386,8 @@ int crash_load_segments(struct kimage *image)
if (ret)
return ret;
image->elf_load_addr = kbuf.mem;
- pr_debug("Loaded ELF headers at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
- image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
+ kexec_dprintk("Loaded ELF headers at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+ image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
return ret;
}
diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index a61c12c01270..e9ae0eac6bf9 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -82,7 +82,7 @@ static int setup_cmdline(struct kimage *image, struct boot_params *params,
cmdline_ptr[cmdline_len - 1] = '\0';
- pr_debug("Final command line is: %s\n", cmdline_ptr);
+ kexec_dprintk("Final command line is: %s\n", cmdline_ptr);
cmdline_ptr_phys = bootparams_load_addr + cmdline_offset;
cmdline_low_32 = cmdline_ptr_phys & 0xffffffffUL;
cmdline_ext_32 = cmdline_ptr_phys >> 32;
@@ -272,7 +272,12 @@ setup_boot_parameters(struct kimage *image, struct boot_params *params,
nr_e820_entries = params->e820_entries;
+ kexec_dprintk("E820 memmap:\n");
for (i = 0; i < nr_e820_entries; i++) {
+ kexec_dprintk("%016llx-%016llx (%d)\n",
+ params->e820_table[i].addr,
+ params->e820_table[i].addr + params->e820_table[i].size - 1,
+ params->e820_table[i].type);
if (params->e820_table[i].type != E820_TYPE_RAM)
continue;
start = params->e820_table[i].addr;
@@ -424,7 +429,7 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
* command line. Make sure it does not overflow
*/
if (cmdline_len + MAX_ELFCOREHDR_STR_LEN > header->cmdline_size) {
- pr_debug("Appending elfcorehdr=<addr> to command line exceeds maximum allowed length\n");
+ kexec_dprintk("Appending elfcorehdr=<addr> to command line exceeds maximum allowed length\n");
return ERR_PTR(-EINVAL);
}
@@ -445,7 +450,7 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
return ERR_PTR(ret);
}
- pr_debug("Loaded purgatory at 0x%lx\n", pbuf.mem);
+ kexec_dprintk("Loaded purgatory at 0x%lx\n", pbuf.mem);
/*
@@ -490,8 +495,8 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
if (ret)
goto out_free_params;
bootparam_load_addr = kbuf.mem;
- pr_debug("Loaded boot_param, command line and misc at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
- bootparam_load_addr, kbuf.bufsz, kbuf.bufsz);
+ kexec_dprintk("Loaded boot_param, command line and misc at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+ bootparam_load_addr, kbuf.bufsz, kbuf.bufsz);
/* Load kernel */
kbuf.buffer = kernel + kern16_size;
@@ -505,8 +510,8 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
goto out_free_params;
kernel_load_addr = kbuf.mem;
- pr_debug("Loaded 64bit kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
- kernel_load_addr, kbuf.bufsz, kbuf.memsz);
+ kexec_dprintk("Loaded 64bit kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+ kernel_load_addr, kbuf.bufsz, kbuf.memsz);
/* Load initrd high */
if (initrd) {
@@ -520,8 +525,8 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
goto out_free_params;
initrd_load_addr = kbuf.mem;
- pr_debug("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
- initrd_load_addr, initrd_len, initrd_len);
+ kexec_dprintk("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+ initrd_load_addr, initrd_len, initrd_len);
setup_initrd(params, initrd_load_addr, initrd_len);
}
--
2.41.0
Then when specifying '-d' for kexec_file_load interface, loaded
locations of kernel/initrd/cmdline etc can be printed out to help debug.
Here replace pr_debug() with the newly added kexec_dprintk() in kexec_file
loading related codes.
And also replace pr_notice() with kexec_dprintk() in elf_kexec_load()
because loaded location of purgatory and device tree are only printed
out for debugging, it doesn't make sense to always print them out.
And also remove kexec_image_info() because the content has been printed
out in generic code.
Signed-off-by: Baoquan He <[email protected]>
---
arch/riscv/kernel/elf_kexec.c | 11 ++++++-----
arch/riscv/kernel/machine_kexec.c | 26 --------------------------
2 files changed, 6 insertions(+), 31 deletions(-)
diff --git a/arch/riscv/kernel/elf_kexec.c b/arch/riscv/kernel/elf_kexec.c
index e60fbd8660c4..5bd1ec3341fe 100644
--- a/arch/riscv/kernel/elf_kexec.c
+++ b/arch/riscv/kernel/elf_kexec.c
@@ -216,7 +216,6 @@ static void *elf_kexec_load(struct kimage *image, char *kernel_buf,
if (ret)
goto out;
kernel_start = image->start;
- pr_notice("The entry point of kernel at 0x%lx\n", image->start);
/* Add the kernel binary to the image */
ret = riscv_kexec_elf_load(image, &ehdr, &elf_info,
@@ -252,8 +251,8 @@ static void *elf_kexec_load(struct kimage *image, char *kernel_buf,
image->elf_load_addr = kbuf.mem;
image->elf_headers_sz = headers_sz;
- pr_debug("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
- image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
+ kexec_dprintk("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+ image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
/* Setup cmdline for kdump kernel case */
modified_cmdline = setup_kdump_cmdline(image, cmdline,
@@ -275,6 +274,8 @@ static void *elf_kexec_load(struct kimage *image, char *kernel_buf,
pr_err("Error loading purgatory ret=%d\n", ret);
goto out;
}
+ kexec_dprintk("Loaded purgatory at 0x%lx\n", kbuf.mem);
+
ret = kexec_purgatory_get_set_symbol(image, "riscv_kernel_entry",
&kernel_start,
sizeof(kernel_start), 0);
@@ -293,7 +294,7 @@ static void *elf_kexec_load(struct kimage *image, char *kernel_buf,
if (ret)
goto out;
initrd_pbase = kbuf.mem;
- pr_notice("Loaded initrd at 0x%lx\n", initrd_pbase);
+ kexec_dprintk("Loaded initrd at 0x%lx\n", initrd_pbase);
}
/* Add the DTB to the image */
@@ -318,7 +319,7 @@ static void *elf_kexec_load(struct kimage *image, char *kernel_buf,
}
/* Cache the fdt buffer address for memory cleanup */
image->arch.fdt = fdt;
- pr_notice("Loaded device tree at 0x%lx\n", kbuf.mem);
+ kexec_dprintk("Loaded device tree at 0x%lx\n", kbuf.mem);
goto out;
out_free_fdt:
diff --git a/arch/riscv/kernel/machine_kexec.c b/arch/riscv/kernel/machine_kexec.c
index 2d139b724bc8..ed9cad20c039 100644
--- a/arch/riscv/kernel/machine_kexec.c
+++ b/arch/riscv/kernel/machine_kexec.c
@@ -18,30 +18,6 @@
#include <linux/interrupt.h>
#include <linux/irq.h>
-/*
- * kexec_image_info - Print received image details
- */
-static void
-kexec_image_info(const struct kimage *image)
-{
- unsigned long i;
-
- pr_debug("Kexec image info:\n");
- pr_debug("\ttype: %d\n", image->type);
- pr_debug("\tstart: %lx\n", image->start);
- pr_debug("\thead: %lx\n", image->head);
- pr_debug("\tnr_segments: %lu\n", image->nr_segments);
-
- for (i = 0; i < image->nr_segments; i++) {
- pr_debug("\t segment[%lu]: %016lx - %016lx", i,
- image->segment[i].mem,
- image->segment[i].mem + image->segment[i].memsz);
- pr_debug("\t\t0x%lx bytes, %lu pages\n",
- (unsigned long) image->segment[i].memsz,
- (unsigned long) image->segment[i].memsz / PAGE_SIZE);
- }
-}
-
/*
* machine_kexec_prepare - Initialize kexec
*
@@ -60,8 +36,6 @@ machine_kexec_prepare(struct kimage *image)
unsigned int control_code_buffer_sz = 0;
int i = 0;
- kexec_image_info(image);
-
/* Find the Flattened Device Tree and save its physical address */
for (i = 0; i < image->nr_segments; i++) {
if (image->segment[i].memsz <= sizeof(fdt))
--
2.41.0
Then when specifying '-d' for kexec_file_load interface, loaded
locations of kernel/initrd/cmdline etc can be printed out to help
debug.
Here replace pr_debug() with the newly added kexec_dprintk() in
kexec_file loading related codes.
Signed-off-by: Baoquan He <[email protected]>
---
arch/powerpc/kexec/elf_64.c | 8 ++++----
arch/powerpc/kexec/file_load_64.c | 18 +++++++++---------
2 files changed, 13 insertions(+), 13 deletions(-)
diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
index eeb258002d1e..904016cf89ea 100644
--- a/arch/powerpc/kexec/elf_64.c
+++ b/arch/powerpc/kexec/elf_64.c
@@ -59,7 +59,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
if (ret)
goto out;
- pr_debug("Loaded the kernel at 0x%lx\n", kernel_load_addr);
+ kexec_dprintk("Loaded the kernel at 0x%lx\n", kernel_load_addr);
ret = kexec_load_purgatory(image, &pbuf);
if (ret) {
@@ -67,7 +67,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
goto out;
}
- pr_debug("Loaded purgatory at 0x%lx\n", pbuf.mem);
+ kexec_dprintk("Loaded purgatory at 0x%lx\n", pbuf.mem);
/* Load additional segments needed for panic kernel */
if (image->type == KEXEC_TYPE_CRASH) {
@@ -99,7 +99,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
goto out;
initrd_load_addr = kbuf.mem;
- pr_debug("Loaded initrd at 0x%lx\n", initrd_load_addr);
+ kexec_dprintk("Loaded initrd at 0x%lx\n", initrd_load_addr);
}
fdt = of_kexec_alloc_and_setup_fdt(image, initrd_load_addr,
@@ -132,7 +132,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
fdt_load_addr = kbuf.mem;
- pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr);
+ kexec_dprintk("Loaded device tree at 0x%lx\n", fdt_load_addr);
slave_code = elf_info.buffer + elf_info.proghdrs[0].p_offset;
ret = setup_purgatory_ppc64(image, slave_code, fdt, kernel_load_addr,
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index 961a6dd67365..5b4c5cb23354 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -577,7 +577,7 @@ static int add_usable_mem_property(void *fdt, struct device_node *dn,
NODE_PATH_LEN, dn);
return -EOVERFLOW;
}
- pr_debug("Memory node path: %s\n", path);
+ kexec_dprintk("Memory node path: %s\n", path);
/* Now that we know the path, find its offset in kdump kernel's fdt */
node = fdt_path_offset(fdt, path);
@@ -590,8 +590,8 @@ static int add_usable_mem_property(void *fdt, struct device_node *dn,
/* Get the address & size cells */
n_mem_addr_cells = of_n_addr_cells(dn);
n_mem_size_cells = of_n_size_cells(dn);
- pr_debug("address cells: %d, size cells: %d\n", n_mem_addr_cells,
- n_mem_size_cells);
+ kexec_dprintk("address cells: %d, size cells: %d\n", n_mem_addr_cells,
+ n_mem_size_cells);
um_info->idx = 0;
if (!check_realloc_usable_mem(um_info, 2)) {
@@ -664,7 +664,7 @@ static int update_usable_mem_fdt(void *fdt, struct crash_mem *usable_mem)
node = fdt_path_offset(fdt, "/ibm,dynamic-reconfiguration-memory");
if (node == -FDT_ERR_NOTFOUND)
- pr_debug("No dynamic reconfiguration memory found\n");
+ kexec_dprintk("No dynamic reconfiguration memory found\n");
else if (node < 0) {
pr_err("Malformed device tree: error reading /ibm,dynamic-reconfiguration-memory.\n");
return -EINVAL;
@@ -776,8 +776,8 @@ static void update_backup_region_phdr(struct kimage *image, Elf64_Ehdr *ehdr)
for (i = 0; i < ehdr->e_phnum; i++) {
if (phdr->p_paddr == BACKUP_SRC_START) {
phdr->p_offset = image->arch.backup_start;
- pr_debug("Backup region offset updated to 0x%lx\n",
- image->arch.backup_start);
+ kexec_dprintk("Backup region offset updated to 0x%lx\n",
+ image->arch.backup_start);
return;
}
}
@@ -850,7 +850,7 @@ int load_crashdump_segments_ppc64(struct kimage *image,
pr_err("Failed to load backup segment\n");
return ret;
}
- pr_debug("Loaded the backup region at 0x%lx\n", kbuf->mem);
+ kexec_dprintk("Loaded the backup region at 0x%lx\n", kbuf->mem);
/* Load elfcorehdr segment - to export crashing kernel's vmcore */
ret = load_elfcorehdr_segment(image, kbuf);
@@ -858,8 +858,8 @@ int load_crashdump_segments_ppc64(struct kimage *image,
pr_err("Failed to load elfcorehdr segment\n");
return ret;
}
- pr_debug("Loaded elf core header at 0x%lx, bufsz=0x%lx memsz=0x%lx\n",
- image->elf_load_addr, kbuf->bufsz, kbuf->memsz);
+ kexec_dprintk("Loaded elf core header at 0x%lx, bufsz=0x%lx memsz=0x%lx\n",
+ image->elf_load_addr, kbuf->bufsz, kbuf->memsz);
return 0;
}
--
2.41.0
Then when specifying '-d' for kexec_file_load interface, loaded
locations of kernel/initrd/cmdline etc can be printed out to help
debug.
Here replace pr_debug() with the newly added kexec_dprintk() in
kexec_file loading related codes.
Signed-off-by: Baoquan He <[email protected]>
---
arch/parisc/kernel/kexec_file.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/parisc/kernel/kexec_file.c b/arch/parisc/kernel/kexec_file.c
index 8c534204f0fd..3fc82130b6c3 100644
--- a/arch/parisc/kernel/kexec_file.c
+++ b/arch/parisc/kernel/kexec_file.c
@@ -38,8 +38,8 @@ static void *elf_load(struct kimage *image, char *kernel_buf,
for (i = 0; i < image->nr_segments; i++)
image->segment[i].mem = __pa(image->segment[i].mem);
- pr_debug("Loaded the kernel at 0x%lx, entry at 0x%lx\n",
- kernel_load_addr, image->start);
+ kexec_dprintk("Loaded the kernel at 0x%lx, entry at 0x%lx\n",
+ kernel_load_addr, image->start);
if (initrd != NULL) {
kbuf.buffer = initrd;
@@ -51,7 +51,7 @@ static void *elf_load(struct kimage *image, char *kernel_buf,
if (ret)
goto out;
- pr_debug("Loaded initrd at 0x%lx\n", kbuf.mem);
+ kexec_dprintk("Loaded initrd at 0x%lx\n", kbuf.mem);
image->arch.initrd_start = kbuf.mem;
image->arch.initrd_end = kbuf.mem + initrd_len;
}
@@ -68,7 +68,7 @@ static void *elf_load(struct kimage *image, char *kernel_buf,
if (ret)
goto out;
- pr_debug("Loaded cmdline at 0x%lx\n", kbuf.mem);
+ kexec_dprintk("Loaded cmdline at 0x%lx\n", kbuf.mem);
image->arch.cmdline = kbuf.mem;
}
out:
--
2.41.0
On Wed, Dec 13, 2023 at 01:57:45PM +0800, Baoquan He wrote:
> Then when specifying '-d' for kexec_file_load interface, loaded
> locations of kernel/initrd/cmdline etc can be printed out to help debug.
>
> Here replace pr_debug() with the newly added kexec_dprintk() in kexec_file
> loading related codes.
>
> And also replace pr_notice() with kexec_dprintk() in elf_kexec_load()
> because loaded location of purgatory and device tree are only printed
> out for debugging, it doesn't make sense to always print them out.
>
> And also remove kexec_image_info() because the content has been printed
> out in generic code.
>
> Signed-off-by: Baoquan He <[email protected]>
I'm sorry - I meant to look at this several days ago but I forgot.
Apart from the typo that crept back into $subject, this version explains
the rationale behind what you're changing a lot better, thanks.
Reviewed-by: Conor Dooley <[email protected]>
Cheers,
Conor.
On 12/19/23 at 02:44pm, Conor Dooley wrote:
> On Wed, Dec 13, 2023 at 01:57:45PM +0800, Baoquan He wrote:
> > Then when specifying '-d' for kexec_file_load interface, loaded
> > locations of kernel/initrd/cmdline etc can be printed out to help debug.
> >
> > Here replace pr_debug() with the newly added kexec_dprintk() in kexec_file
> > loading related codes.
> >
> > And also replace pr_notice() with kexec_dprintk() in elf_kexec_load()
> > because loaded location of purgatory and device tree are only printed
> > out for debugging, it doesn't make sense to always print them out.
> >
> > And also remove kexec_image_info() because the content has been printed
> > out in generic code.
> >
> > Signed-off-by: Baoquan He <[email protected]>
>
> I'm sorry - I meant to look at this several days ago but I forgot.
> Apart from the typo that crept back into $subject, this version explains
> the rationale behind what you're changing a lot better, thanks.
Thanks for careful checking. I forgot the typo fixing you have pointed
out in v3 reviewing.
Hi Andrew,
Could you help fix the typo in subject?
[PATCH v4 5/7] kexec_file, ricv: print out debugging message if required
~~~ s/ricv/riscv/
On Wed, 20 Dec 2023 12:22:29 +0800 Baoquan He <[email protected]> wrote:
> Could you help fix the typo in subject?
>
> [PATCH v4 5/7] kexec_file, ricv: print out debugging message if required
> ~~~ s/ricv/riscv/
I made that change.
On 12/20/23 at 07:46am, Andrew Morton wrote:
> On Wed, 20 Dec 2023 12:22:29 +0800 Baoquan He <[email protected]> wrote:
>
> > Could you help fix the typo in subject?
> >
> > [PATCH v4 5/7] kexec_file, ricv: print out debugging message if required
> > ~~~ s/ricv/riscv/
>
> I made that change.
Thanks a lot.
Hello:
This series was applied to riscv/linux.git (fixes)
by Andrew Morton <[email protected]>:
On Wed, 13 Dec 2023 13:57:40 +0800 you wrote:
> Currently, specifying '-d' on kexec command will print a lot of debugging
> informationabout kexec/kdump loading with kexec_load interface.
>
> However, kexec_file_load prints nothing even though '-d' is specified.
> It's very inconvenient to debug or analyze the kexec/kdump loading when
> something wrong happened with kexec/kdump itself or develper want to
> check the kexec/kdump loading.
>
> [...]
Here is the summary with links:
- [v4,1/7] kexec_file: add kexec_file flag to control debug printing
(no matching commit)
- [v4,2/7] kexec_file: print out debugging message if required
(no matching commit)
- [v4,3/7] kexec_file, x86: print out debugging message if required
(no matching commit)
- [v4,4/7] kexec_file, arm64: print out debugging message if required
(no matching commit)
- [v4,5/7] kexec_file, ricv: print out debugging message if required
https://git.kernel.org/riscv/c/eb7622d908a0
- [v4,6/7] kexec_file, power: print out debugging message if required
(no matching commit)
- [v4,7/7] kexec_file, parisc: print out debugging message if required
(no matching commit)
You are awesome, thank you!
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