Re: [PATCH] makedumpfile: Enable --mem-usage for s390x

[Michael Holzheu <holzheu@linux.vnet.ibm.com>]

On Tue, 14 Oct 2014 07:19:13 +0000
Atsushi Kumagai <kumagai-atsushi@mxc.nes.nec.co.jp> wrote:

[snip]

> 
> I understand why your patch works on s390x, so how about this way ?
> 
>  1. Define "is_phys_addr()" for --mem-usage.
>  2. Implement is_phys_addr() using is_iomem_phys_addr() for s390x
>     while x86_64 uses is_vmalloc_addr_x86_64().
>  3. Use is_phys_addr() instead of is_vmalloc_addr() in get_kcore_dump_loads().

Hello Atsushi,

Great, so let's do that.

@Baoquan:
If you want to use the is_iomem_phys_addr() function also for x86,
you could perhaps add an additional patch.

Here the updated patch:
---
[PATCH] makedumpfile: Enable --mem-usage for s390x

Replace is_vmalloc_addr() by is_phys_addr() and implement is_phys_addr()
using /proc/iommem parsing to enable the new makedumpfile option "--mem-usage"
on s390x.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
---
 elf_info.c     |    4 ++--
 makedumpfile.c |   26 ++++++++++++++++++++++++++
 makedumpfile.h |   15 ++++++++-------
 3 files changed, 36 insertions(+), 9 deletions(-)

--- a/elf_info.c
+++ b/elf_info.c
@@ -854,7 +854,7 @@ int get_kcore_dump_loads(void)
 
 	for (i = 0; i < num_pt_loads; ++i) {
 		struct pt_load_segment *p = &pt_loads[i];
-		if (is_vmalloc_addr(p->virt_start))
+		if (!is_phys_addr(p->virt_start))
 			continue;
 		loads++;
 	}
@@ -874,7 +874,7 @@ int get_kcore_dump_loads(void)
 
 	for (i = 0, j = 0; i < num_pt_loads; ++i) {
 		struct pt_load_segment *p = &pt_loads[i];
-		if (is_vmalloc_addr(p->virt_start))
+		if (!is_phys_addr(p->virt_start))
 			continue;
 		if (j >= loads)
 			return FALSE;
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -9227,6 +9227,32 @@ int is_crashkernel_mem_reserved(void)
 	return !!crash_reserved_mem_nr;
 }
 
+struct addr_check {
+	unsigned long addr;
+	int found;
+};
+
+static int phys_addr_callback(void *data, int nr, char *str,
+			      unsigned long base, unsigned long length)
+{
+	struct addr_check *addr_check = data;
+	unsigned long addr = addr_check->addr;
+
+	if (addr >= base && addr < base + length) {
+		addr_check->found = 1;
+		return -1;
+	}
+	return 0;
+}
+
+int is_iomem_phys_addr(unsigned long addr)
+{
+	struct addr_check addr_check = {addr, 0};
+
+	iomem_for_each_line("System RAM\n", phys_addr_callback, &addr_check);
+	return addr_check.found;
+}
+
 static int get_page_offset(void)
 {
 	struct utsname utsname;
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -765,7 +765,7 @@ unsigned long long vaddr_to_paddr_arm(un
 #define get_machdep_info()	get_machdep_info_arm()
 #define get_versiondep_info()	TRUE
 #define vaddr_to_paddr(X)	vaddr_to_paddr_arm(X)
-#define is_vmalloc_addr(X)	TRUE
+#define is_phys_addr(X)		TRUE
 #endif /* arm */
 
 #ifdef __x86__
@@ -776,7 +776,7 @@ unsigned long long vaddr_to_paddr_x86(un
 #define get_machdep_info()	get_machdep_info_x86()
 #define get_versiondep_info()	get_versiondep_info_x86()
 #define vaddr_to_paddr(X)	vaddr_to_paddr_x86(X)
-#define is_vmalloc_addr(X)	TRUE
+#define is_phys_addr(X)		TRUE
 #endif /* x86 */
 
 #ifdef __x86_64__
@@ -789,7 +789,7 @@ unsigned long long vaddr_to_paddr_x86_64
 #define get_machdep_info()	get_machdep_info_x86_64()
 #define get_versiondep_info()	get_versiondep_info_x86_64()
 #define vaddr_to_paddr(X)	vaddr_to_paddr_x86_64(X)
-#define is_vmalloc_addr(X)	is_vmalloc_addr_x86_64(X)
+#define is_phys_addr(X)		(!is_vmalloc_addr_x86_64(X)
 #endif /* x86_64 */
 
 #ifdef __powerpc64__ /* powerpc64 */
@@ -800,7 +800,7 @@ unsigned long long vaddr_to_paddr_ppc64(
 #define get_machdep_info()	get_machdep_info_ppc64()
 #define get_versiondep_info()	get_versiondep_info_ppc64()
 #define vaddr_to_paddr(X)	vaddr_to_paddr_ppc64(X)
-#define is_vmalloc_addr(X)	TRUE
+#define is_phys_addr(X)		TRUE
 #endif          /* powerpc64 */
 
 #ifdef __powerpc32__ /* powerpc32 */
@@ -810,7 +810,7 @@ unsigned long long vaddr_to_paddr_ppc(un
 #define get_machdep_info()	get_machdep_info_ppc()
 #define get_versiondep_info()	TRUE
 #define vaddr_to_paddr(X)	vaddr_to_paddr_ppc(X)
-#define is_vmalloc_addr(X)	TRUE
+#define is_phys_addr(X)		TRUE
 #endif          /* powerpc32 */
 
 #ifdef __s390x__ /* s390x */
@@ -820,7 +820,7 @@ unsigned long long vaddr_to_paddr_s390x(
 #define get_machdep_info()	get_machdep_info_s390x()
 #define get_versiondep_info()	TRUE
 #define vaddr_to_paddr(X)	vaddr_to_paddr_s390x(X)
-#define is_vmalloc_addr(X)	TRUE
+#define is_phys_addr(X)		is_iomem_phys_addr(X)
 #endif          /* s390x */
 
 #ifdef __ia64__ /* ia64 */
@@ -832,7 +832,7 @@ unsigned long long vaddr_to_paddr_ia64(u
 #define get_versiondep_info()	TRUE
 #define vaddr_to_paddr(X)	vaddr_to_paddr_ia64(X)
 #define VADDR_REGION(X)		(((unsigned long)(X)) >> REGION_SHIFT)
-#define is_vmalloc_addr(X)	TRUE
+#define is_phys_addr(X)		TRUE
 #endif          /* ia64 */
 
 typedef unsigned long long mdf_pfn_t;
@@ -1567,6 +1567,7 @@ int read_disk_dump_header(struct disk_du
 int read_kdump_sub_header(struct kdump_sub_header *kh, char *filename);
 void close_vmcoreinfo(void);
 int close_files_for_creating_dumpfile(void);
+int is_iomem_phys_addr(unsigned long addr);
 
 
 /*


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