linux-kernel - [RFC PATCH 06/10] fadump: Add PT_NOTE program header for vmcoreinfo

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Message-ID: <20110713180734.6210.55823.stgit@mars.in.ibm.com>
Date:	Wed, 13 Jul 2011 23:37:43 +0530
From:	Mahesh J Salgaonkar <mahesh@...ux.vnet.ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	Michael Ellerman <michael@...erman.id.au>,
	Haren Myneni <hbabu@...ibm.com>,
	Anton Blanchard <anton@...ba.org>,
	Milton Miller <miltonm@....com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [RFC PATCH 06/10] fadump: Add PT_NOTE program header for vmcoreinfo

From: Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>

Introduce a PT_NOTE program header that points to physical address of
vmcoreinfo_note buffer declared in kernel/kexec.c. The vmcoreinfo
note buffer is populated during crash_fadump() at the time of system
crash.

Signed-off-by: Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>
---
 arch/powerpc/kernel/fadump.c |   29 +++++++++++++++++++++++++++++
 1 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 51e645c..fee132b 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -817,6 +817,19 @@ static void setup_crash_memory_ranges(void)
 	}
 }
 
+/*
+ * If the given physical address falls within the boot memory region then
+ * return the relocated address that points to the dump region reserved
+ * for saving initial boot memory contents.
+ */
+static inline unsigned long relocate(unsigned long paddr)
+{
+	if (paddr > RMR_START && paddr < fw_dump.boot_memory_size)
+		return fdm.rmr_region.destination_address + paddr;
+	else
+		return paddr;
+}
+
 static int create_elfcore_headers(char *bufp)
 {
 	struct elfhdr *elf;
@@ -849,6 +862,22 @@ static int create_elfcore_headers(char *bufp)
 	/* Increment number of program headers. */
 	(elf->e_phnum)++;
 
+	/* setup ELF PT_NOTE for vmcoreinfo */
+	phdr = (struct elf_phdr *)bufp;
+	bufp += sizeof(struct elf_phdr);
+	phdr->p_type	= PT_NOTE;
+	phdr->p_flags	= 0;
+	phdr->p_vaddr	= 0;
+	phdr->p_align	= 0;
+
+	phdr->p_paddr	= relocate(paddr_vmcoreinfo_note());
+	phdr->p_offset	= phdr->p_paddr;
+	phdr->p_memsz	= vmcoreinfo_max_size;
+	phdr->p_filesz	= vmcoreinfo_max_size;
+
+	/* Increment number of program headers. */
+	(elf->e_phnum)++;
+
 	/* setup PT_LOAD sections. */
 
 	for (i = 0; i < crash_mem_ranges; i++) {

--
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