From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756805Ab1I2PIX (ORCPT ); Thu, 29 Sep 2011 11:08:23 -0400 Received: from e28smtp04.in.ibm.com ([122.248.162.4]:52706 "EHLO e28smtp04.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754835Ab1I2PIW (ORCPT ); Thu, 29 Sep 2011 11:08:22 -0400 Subject: [RFC PATCH v2 06/10] fadump: Add PT_NOTE program header for vmcoreinfo To: linuxppc-dev , Linux Kernel , Benjamin Herrenschmidt From: Mahesh J Salgaonkar Cc: Haren Myneni , Anton Blanchard , Milton Miller , "Eric W. Biederman" Date: Thu, 29 Sep 2011 20:37:44 +0530 Message-ID: <20110929150744.26689.43842.stgit@mars.in.ibm.com> In-Reply-To: <20110929150117.26689.62053.stgit@mars.in.ibm.com> References: <20110929150117.26689.62053.stgit@mars.in.ibm.com> User-Agent: StGit/0.15-1-ged5e-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mahesh Salgaonkar 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 --- 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++) {