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Message-ID: <20110929150744.26689.43842.stgit@mars.in.ibm.com>
Date: Thu, 29 Sep 2011 20:37:44 +0530
From: Mahesh J Salgaonkar <mahesh@...ux.vnet.ibm.com>
To: linuxppc-dev <linuxppc-dev@...abs.org>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Haren Myneni <hbabu@...ibm.com>, Anton Blanchard <anton@...ba.org>,
Milton Miller <miltonm@....com>,
"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [RFC PATCH v2 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 d7c8767..13c830c 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -772,6 +772,19 @@ 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;
@@ -804,6 +817,22 @@ 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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