10:12 a.m.
Hi Dave,
When starting crash on s390(x) with CONFIG_SPARSEMEM enabled we get the
following error message:
crash: CONFIG_SPARSEMEM kernels not supported for this architecture
The following patch fixes this problem, but I am not sure, if I set
_MAX_PHYSMEM_BITS to the correct value (I used 31 for s390 and 64 for
s390x). Could you please explain the meaning of _MAX_PHSYSMEM_BITS?
---
diff -Naurp crash-4.0-6.3/defs.h crash-4.0-6.3-config-sparse/defs.h
--- crash-4.0-6.3/defs.h 2008-04-29 19:39:17.000000000 +0200
+++ crash-4.0-6.3-config-sparse/defs.h 2008-08-12 17:03:54.000000000 +0200
@@ -2634,6 +2634,8 @@ struct efi_memory_desc_t {
#define TIF_SIGPENDING (2)
+#define _MAX_PHYSMEM_BITS 31
+
#endif /* S390 */
#ifdef S390X
@@ -2656,6 +2658,8 @@ struct efi_memory_desc_t {
#define TIF_SIGPENDING (2)
+#define _MAX_PHYSMEM_BITS 64
+
#endif /* S390X */
#ifdef PLATFORM
diff -Naurp crash-4.0-6.3/s390.c crash-4.0-6.3-config-sparse/s390.c
--- crash-4.0-6.3/s390.c 2008-04-29 19:39:17.000000000 +0200
+++ crash-4.0-6.3-config-sparse/s390.c 2008-08-12 17:04:03.000000000 +0200
@@ -130,6 +130,7 @@ s390_init(int when)
machdep->dump_irq = s390_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
break;
case POST_INIT:
diff -Naurp crash-4.0-6.3/s390x.c crash-4.0-6.3-config-sparse/s390x.c
--- crash-4.0-6.3/s390x.c 2008-04-29 19:39:16.000000000 +0200
+++ crash-4.0-6.3-config-sparse/s390x.c 2008-08-12 17:04:01.000000000 +0200
@@ -128,6 +128,7 @@ s390x_init(int when)
machdep->dump_irq = s390x_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
break;
case POST_INIT:
11 a.m.
Michael Holzheu wrote:
Hi Dave,
When starting crash on s390(x) with CONFIG_SPARSEMEM enabled we get the
following error message:
crash: CONFIG_SPARSEMEM kernels not supported for this architecture
The following patch fixes this problem, but I am not sure, if I set
_MAX_PHYSMEM_BITS to the correct value (I used 31 for s390 and 64 for
s390x). Could you please explain the meaning of _MAX_PHSYSMEM_BITS?
---
Hi Michael,
Actually, the originator of CONFIG_SPARSEMENT support is your IBM compatriot,
and can probably answer this best:
4.0-2.22 - Incorporated initial patch-set to implement support for kernels built
with CONFIG_SPARSEMEM. (dwilder(a)us.ibm.com)
...
Dave is still listed as a member of this mailing list.
Anyway, as I understand it, the _MAX_PHYSMEM_BITS() macro for each architecture
is a clone of the kernel's per-arch MAX_PHYSMEM_BITS #define. For the s390
arch, it's found in "include/asm-s390/sparsemem.h":
#ifndef _ASM_S390_SPARSEMEM_H
#define _ASM_S390_SPARSEMEM_H
#define SECTION_SIZE_BITS 25
#ifdef CONFIG_64BIT
#define MAX_PHYSADDR_BITS 42
#define MAX_PHYSMEM_BITS 42
#else
#define MAX_PHYSADDR_BITS 31
#define MAX_PHYSMEM_BITS 31
#endif /* CONFIG_64BIT */
#endif /* _ASM_S390_SPARSEMEM_H */
And it -- along with SECTION_SIZE_BITS -- fits into the math for the SECTIONS_SHIFT value
in "include/linux/mmzone.h":
SECTIONS_SHIFT 839 #define SECTIONS_SHIFT (MAX_PHYSMEM_BITS - SECTION_SIZE_BITS)
And so the crash utility follows its lead:
#define SECTION_SIZE_BITS() (machdep->section_size_bits)
#define MAX_PHYSMEM_BITS() (machdep->max_physmem_bits)
#define SECTIONS_SHIFT() (MAX_PHYSMEM_BITS() - SECTION_SIZE_BITS())
and also using the arch-specific SECTION_SIZE_BITS() in the same manner.
So I'm surprised that your patch "works"? It would seem that it would need
to:
(1) to use "42" for the s390x _MAX_PHYSMEM_BITS, and
(2) you would also need to #define a _SECTION_SIZE_BITS value for the two
architectures as well.
Dave
diff -Naurp crash-4.0-6.3/defs.h crash-4.0-6.3-config-sparse/defs.h
--- crash-4.0-6.3/defs.h 2008-04-29 19:39:17.000000000 +0200
+++ crash-4.0-6.3-config-sparse/defs.h 2008-08-12 17:03:54.000000000 +0200
@@ -2634,6 +2634,8 @@ struct efi_memory_desc_t {
#define TIF_SIGPENDING (2)
+#define _MAX_PHYSMEM_BITS 31
+
#endif /* S390 */
#ifdef S390X
@@ -2656,6 +2658,8 @@ struct efi_memory_desc_t {
#define TIF_SIGPENDING (2)
+#define _MAX_PHYSMEM_BITS 64
+
#endif /* S390X */
#ifdef PLATFORM
diff -Naurp crash-4.0-6.3/s390.c crash-4.0-6.3-config-sparse/s390.c
--- crash-4.0-6.3/s390.c 2008-04-29 19:39:17.000000000 +0200
+++ crash-4.0-6.3-config-sparse/s390.c 2008-08-12 17:04:03.000000000 +0200
@@ -130,6 +130,7 @@ s390_init(int when)
machdep->dump_irq = s390_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
break;
case POST_INIT:
diff -Naurp crash-4.0-6.3/s390x.c crash-4.0-6.3-config-sparse/s390x.c
--- crash-4.0-6.3/s390x.c 2008-04-29 19:39:16.000000000 +0200
+++ crash-4.0-6.3-config-sparse/s390x.c 2008-08-12 17:04:01.000000000 +0200
@@ -128,6 +128,7 @@ s390x_init(int when)
machdep->dump_irq = s390x_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
break;
case POST_INIT:
10:44 a.m.
On Tue, 2008-08-12 at 17:12 +0200, Michael Holzheu wrote:
Hi Dave,
When starting crash on s390(x) with CONFIG_SPARSEMEM enabled we get the
following error message:
crash: CONFIG_SPARSEMEM kernels not supported for this architecture
The following patch fixes this problem, but I am not sure, if I set
_MAX_PHYSMEM_BITS to the correct value (I used 31 for s390 and 64 for
s390x). Could you please explain the meaning of _MAX_PHSYSMEM_BITS?
---
_MAX_PHSYSMEM_BITS is the number of physical addressing bits provided by
the hardware. It is defined as MAX_PHSYSMEM_BITS in asm/sparsemem.h.
8:17 a.m.
David J. Wilder wrote:
On Tue, 2008-08-12 at 17:12 +0200, Michael Holzheu wrote:
>Hi Dave,
>
>When starting crash on s390(x) with CONFIG_SPARSEMEM enabled we get the
>following error message:
>
>crash: CONFIG_SPARSEMEM kernels not supported for this architecture
>
>The following patch fixes this problem, but I am not sure, if I set
>_MAX_PHYSMEM_BITS to the correct value (I used 31 for s390 and 64 for
>s390x). Could you please explain the meaning of _MAX_PHSYSMEM_BITS?
>---
>
_MAX_PHSYSMEM_BITS is the number of physical addressing bits provided by
the hardware. It is defined as MAX_PHSYSMEM_BITS in asm/sparsemem.h.
Yeah -- I've been having a side discussion with Michael about this,
re: the need for his patch to use the correct MAX_PHYSMEM_BITS values
from sparsemem.h, as well as to initialize machdep->section_size_bits
with the appropriate _SECTION_SIZE_BITS values from the same file.
Dave
11:30 a.m.
Hi Dave,
Here the new patch.
Unfortunately kmem -n reports an error...
crash> kmem -n
NODE SIZE PGLIST_DATA BOOTMEM_DATA NODE_ZONES
0 131071 4c9100 90c158 4c9100
4cd800
4d1f00
MEM_MAP START_PADDR START_MAPNR
3e040000000 0 0
ZONE NAME SIZE MEM_MAP START_PADDR START_MAPNR
0 DMA 131071 3e040000000 0 0
1 Normal 0 0 0 0
2 Movable 0 0 0 0
-------------------------------------------------------------------
NR SECTION CODED_MEM_MAP MEM_MAP PFN
0 a3a800 3e040000000 3e040000000
0
1 a3a810 3e040000000 3e040580000
65536
kmem: read error: kernel virtual address: 0 type: "memory section"
---
diff -Naurp crash-4.0-7.1/defs.h crash-4.0-7.1-sparse-mem-s390/defs.h
--- crash-4.0-7.1/defs.h 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/defs.h 2008-09-04 18:24:10.000000000 +0200
@@ -2636,6 +2636,9 @@ struct efi_memory_desc_t {
#define TIF_SIGPENDING (2)
+#define _SECTION_SIZE_BITS 25
+#define _MAX_PHYSMEM_BITS 31
+
#endif /* S390 */
#ifdef S390X
@@ -2658,6 +2661,9 @@ struct efi_memory_desc_t {
#define TIF_SIGPENDING (2)
+#define _SECTION_SIZE_BITS 28
+#define _MAX_PHYSMEM_BITS 42
+
#endif /* S390X */
#ifdef PLATFORM
diff -Naurp crash-4.0-7.1/s390.c crash-4.0-7.1-sparse-mem-s390/s390.c
--- crash-4.0-7.1/s390.c 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/s390.c 2008-09-04 18:24:27.000000000 +0200
@@ -130,11 +130,14 @@ s390_init(int when)
machdep->dump_irq = s390_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
+ machdep->section_size_bits = _SECTION_SIZE_BITS;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
break;
case POST_INIT:
break;
}
+
}
/*
diff -Naurp crash-4.0-7.1/s390x.c crash-4.0-7.1-sparse-mem-s390/s390x.c
--- crash-4.0-7.1/s390x.c 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/s390x.c 2008-09-04 18:24:24.000000000 +0200
@@ -128,6 +128,8 @@ s390x_init(int when)
machdep->dump_irq = s390x_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
+ machdep->section_size_bits = _SECTION_SIZE_BITS;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
break;
case POST_INIT:
10:19 a.m.
Michael Holzheu wrote:
Hi Dave,
Here the new patch.
Unfortunately kmem -n reports an error...
crash> kmem -n
NODE SIZE PGLIST_DATA BOOTMEM_DATA NODE_ZONES
0 131071 4c9100 90c158 4c9100
4cd800
4d1f00
MEM_MAP START_PADDR START_MAPNR
3e040000000 0 0
ZONE NAME SIZE MEM_MAP START_PADDR START_MAPNR
0 DMA 131071 3e040000000 0 0
1 Normal 0 0 0 0
2 Movable 0 0 0 0
-------------------------------------------------------------------
NR SECTION CODED_MEM_MAP MEM_MAP PFN
0 a3a800 3e040000000 3e040000000
0
1 a3a810 3e040000000 3e040580000
65536
kmem: read error: kernel virtual address: 0 type: "memory section"
My guess is that it might have something to do with the zero-based kernel
virtual address space on s390/s390x.
I also guess that the trail would have been:
cmd_kmem
dump_memory_nodes
dump_mem_sections
section_mem_map_addr
read_mem_section
where read_mem_section() can legitimately return if the addr
passed is not kernel virtual address of a mem_section structure:
char *
read_mem_section(ulong addr)
{
if (!IS_KVADDR(addr))
return 0;
readmem(addr, KVADDR, vt->mem_section, SIZE(mem_section),
"memory section", FAULT_ON_ERROR);
return vt->mem_section;
}
But the s390/s390x implementation of IS_KVADDR() accepts a kernel
virtual address of zero. It tries to read it and craps out.
I note that the kernel has this:
static inline int valid_section(struct mem_section *section)
{
return (section && (section->section_mem_map &
SECTION_MARKED_PRESENT));
}
which requires a non-zero section address for all arches. I'm thinking that
if you make read_mem_section() above return 0 if addr is zero, then it might
fix it?
Dave
---
diff -Naurp crash-4.0-7.1/defs.h crash-4.0-7.1-sparse-mem-s390/defs.h
--- crash-4.0-7.1/defs.h 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/defs.h 2008-09-04 18:24:10.000000000 +0200
@@ -2636,6 +2636,9 @@ struct efi_memory_desc_t {
#define TIF_SIGPENDING (2)
+#define _SECTION_SIZE_BITS 25
+#define _MAX_PHYSMEM_BITS 31
+
#endif /* S390 */
#ifdef S390X
@@ -2658,6 +2661,9 @@ struct efi_memory_desc_t {
#define TIF_SIGPENDING (2)
+#define _SECTION_SIZE_BITS 28
+#define _MAX_PHYSMEM_BITS 42
+
#endif /* S390X */
#ifdef PLATFORM
diff -Naurp crash-4.0-7.1/s390.c crash-4.0-7.1-sparse-mem-s390/s390.c
--- crash-4.0-7.1/s390.c 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/s390.c 2008-09-04 18:24:27.000000000 +0200
@@ -130,11 +130,14 @@ s390_init(int when)
machdep->dump_irq = s390_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
+ machdep->section_size_bits = _SECTION_SIZE_BITS;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
break;
case POST_INIT:
break;
}
+
}
/*
diff -Naurp crash-4.0-7.1/s390x.c crash-4.0-7.1-sparse-mem-s390/s390x.c
--- crash-4.0-7.1/s390x.c 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/s390x.c 2008-09-04 18:24:24.000000000 +0200
@@ -128,6 +128,8 @@ s390x_init(int when)
machdep->dump_irq = s390x_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
+ machdep->section_size_bits = _SECTION_SIZE_BITS;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
break;
case POST_INIT:
--
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8 a.m.
Hi Dave,
Am Donnerstag, den 04.09.2008, 11:19 -0400 schrieb Dave Anderson:
[snip]
My guess is that it might have something to do with the zero-based
kernel
virtual address space on s390/s390x.
I also guess that the trail would have been:
cmd_kmem
dump_memory_nodes
dump_mem_sections
section_mem_map_addr
read_mem_section
where read_mem_section() can legitimately return if the addr
passed is not kernel virtual address of a mem_section structure:
char *
read_mem_section(ulong addr)
{
if (!IS_KVADDR(addr))
return 0;
readmem(addr, KVADDR, vt->mem_section, SIZE(mem_section),
"memory section", FAULT_ON_ERROR);
return vt->mem_section;
}
But the s390/s390x implementation of IS_KVADDR() accepts a kernel
virtual address of zero. It tries to read it and craps out.
Right. Looks like we should check for NULL pointer instead of using
IS_KVADDR(). Since the mem_sec array is static, it is initialized with
zeroes. When I change the check, everything works fine.
What about the following patch...
---
diff -Naurp crash-4.0-7.1/defs.h crash-4.0-7.1-sparse-mem-s390/defs.h
--- crash-4.0-7.1/defs.h 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/defs.h 2008-09-04 18:24:10.000000000 +0200
@@ -2636,6 +2636,9 @@ struct efi_memory_desc_t {
#define TIF_SIGPENDING (2)
+#define _SECTION_SIZE_BITS 25
+#define _MAX_PHYSMEM_BITS 31
+
#endif /* S390 */
#ifdef S390X
@@ -2658,6 +2661,9 @@ struct efi_memory_desc_t {
#define TIF_SIGPENDING (2)
+#define _SECTION_SIZE_BITS 28
+#define _MAX_PHYSMEM_BITS 42
+
#endif /* S390X */
#ifdef PLATFORM
diff -Naurp crash-4.0-7.1/memory.c crash-4.0-7.1-sparse-mem-s390/memory.c
--- crash-4.0-7.1/memory.c 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/memory.c 2008-09-05 14:48:10.000000000 +0200
@@ -12653,7 +12653,7 @@ sparse_mem_init(void)
char *
read_mem_section(ulong addr)
{
- if (!IS_KVADDR(addr))
+ if (addr == 0)
return 0;
readmem(addr, KVADDR, vt->mem_section, SIZE(mem_section),
@@ -12668,7 +12668,7 @@ nr_to_section(ulong nr)
ulong addr;
ulong *mem_sec = vt->mem_sec;
- if (!IS_KVADDR(mem_sec[SECTION_NR_TO_ROOT(nr)]))
+ if (mem_sec[SECTION_NR_TO_ROOT(nr)] == 0)
return 0;
if (IS_SPARSEMEM_EX())
diff -Naurp crash-4.0-7.1/s390.c crash-4.0-7.1-sparse-mem-s390/s390.c
--- crash-4.0-7.1/s390.c 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/s390.c 2008-09-05 14:49:25.000000000 +0200
@@ -130,6 +130,8 @@ s390_init(int when)
machdep->dump_irq = s390_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
+ machdep->section_size_bits = _SECTION_SIZE_BITS;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
break;
case POST_INIT:
diff -Naurp crash-4.0-7.1/s390x.c crash-4.0-7.1-sparse-mem-s390/s390x.c
--- crash-4.0-7.1/s390x.c 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/s390x.c 2008-09-04 18:24:24.000000000 +0200
@@ -128,6 +128,8 @@ s390x_init(int when)
machdep->dump_irq = s390x_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
+ machdep->section_size_bits = _SECTION_SIZE_BITS;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
break;
case POST_INIT:
6:06 a.m.
Michael Holzheu wrote:
Hi Dave,
Am Donnerstag, den 04.09.2008, 11:19 -0400 schrieb Dave Anderson:
[snip]
>My guess is that it might have something to do with the zero-based kernel
>virtual address space on s390/s390x.
>
>I also guess that the trail would have been:
>
> cmd_kmem
> dump_memory_nodes
> dump_mem_sections
> section_mem_map_addr
> read_mem_section
>
>where read_mem_section() can legitimately return if the addr
>passed is not kernel virtual address of a mem_section structure:
>
> char *
> read_mem_section(ulong addr)
> {
> if (!IS_KVADDR(addr))
> return 0;
>
> readmem(addr, KVADDR, vt->mem_section, SIZE(mem_section),
> "memory section", FAULT_ON_ERROR);
>
> return vt->mem_section;
> }
>
>But the s390/s390x implementation of IS_KVADDR() accepts a kernel
>virtual address of zero. It tries to read it and craps out.
>
Right. Looks like we should check for NULL pointer instead of using
IS_KVADDR(). Since the mem_sec array is static, it is initialized with
zeroes. When I change the check, everything works fine.
Great -- the patch looks fine. Queued for the next release.
Thanks Michael,
Dave
What about the following patch...
---
diff -Naurp crash-4.0-7.1/defs.h crash-4.0-7.1-sparse-mem-s390/defs.h
--- crash-4.0-7.1/defs.h 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/defs.h 2008-09-04 18:24:10.000000000 +0200
@@ -2636,6 +2636,9 @@ struct efi_memory_desc_t {
#define TIF_SIGPENDING (2)
+#define _SECTION_SIZE_BITS 25
+#define _MAX_PHYSMEM_BITS 31
+
#endif /* S390 */
#ifdef S390X
@@ -2658,6 +2661,9 @@ struct efi_memory_desc_t {
#define TIF_SIGPENDING (2)
+#define _SECTION_SIZE_BITS 28
+#define _MAX_PHYSMEM_BITS 42
+
#endif /* S390X */
#ifdef PLATFORM
diff -Naurp crash-4.0-7.1/memory.c crash-4.0-7.1-sparse-mem-s390/memory.c
--- crash-4.0-7.1/memory.c 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/memory.c 2008-09-05 14:48:10.000000000 +0200
@@ -12653,7 +12653,7 @@ sparse_mem_init(void)
char *
read_mem_section(ulong addr)
{
- if (!IS_KVADDR(addr))
+ if (addr == 0)
return 0;
readmem(addr, KVADDR, vt->mem_section, SIZE(mem_section),
@@ -12668,7 +12668,7 @@ nr_to_section(ulong nr)
ulong addr;
ulong *mem_sec = vt->mem_sec;
- if (!IS_KVADDR(mem_sec[SECTION_NR_TO_ROOT(nr)]))
+ if (mem_sec[SECTION_NR_TO_ROOT(nr)] == 0)
return 0;
if (IS_SPARSEMEM_EX())
diff -Naurp crash-4.0-7.1/s390.c crash-4.0-7.1-sparse-mem-s390/s390.c
--- crash-4.0-7.1/s390.c 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/s390.c 2008-09-05 14:49:25.000000000 +0200
@@ -130,6 +130,8 @@ s390_init(int when)
machdep->dump_irq = s390_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
+ machdep->section_size_bits = _SECTION_SIZE_BITS;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
break;
case POST_INIT:
diff -Naurp crash-4.0-7.1/s390x.c crash-4.0-7.1-sparse-mem-s390/s390x.c
--- crash-4.0-7.1/s390x.c 2008-08-19 17:10:51.000000000 +0200
+++ crash-4.0-7.1-sparse-mem-s390/s390x.c 2008-09-04 18:24:24.000000000 +0200
@@ -128,6 +128,8 @@ s390x_init(int when)
machdep->dump_irq = s390x_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
+ machdep->section_size_bits = _SECTION_SIZE_BITS;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
break;
case POST_INIT:
--
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7 comments
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participants (3)
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Dave Anderson -
David J. Wilder -
Michael Holzheu